* [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing
[not found] <20180813223448.21316-1-jmkrzyszt@gmail.com>
@ 2018-08-20 23:43 ` Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (6 more replies)
0 siblings, 7 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-20 23:43 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, netdev, linux-i2c, Peter Meerwald-Stadler,
devel, Florian Fainelli, Jonathan Corbet, Janusz Krzysztofik,
Kishon Vijay Abraham I, linux-serial, Jiri Slaby,
Michael Hennerich, linux-gpio, Lars-Peter Clausen,
Greg Kroah-Hartman, linux-mmc, linux-kernel, Peter Rosin,
Miguel Ojeda Sandonis, Peter Korsgaard, Hartmut Knaack
This series is a follow up of the former "mtd: rawnand: ams-delta: Use
gpio-omap accessors for data I/O" which already contained some changes
to gpiolib. Those previous attempts were commented by Borris Brezillon
who suggested using GPIO API modified to accept bitmaps, and by Linus
Walleij who suggested still more great ideas for further immprovement
of the proposed API changes - thanks!
The goal is to boost performans of get/set array functions while
processing GPIO arrays which represent pins of a signle chip in
hardware order. If resulting performance is close to PIO, GPIO API
can be used for data I/O without much loss of speed.
Created and tested on a low end Amstrad Delta board with NAND driver
updated to use GPIO API for data I/O. Performance degrade compared to
PIO is much better than before the optimization but still not quite
satisfactory.
Janusz Krzysztofik (4):
gpiolib: Pass bitmaps, not integer arrays, to get/set array
gpiolib: Identify arrays matching GPIO hardware
gpiolib: Pass array info to get/set array functions
gpiolib: Implement fast processing path in get/set array
Documentation/driver-api/gpio/board.rst | 15 +
Documentation/driver-api/gpio/consumer.rst | 48 +++-
drivers/auxdisplay/hd44780.c | 64 +++---
drivers/bus/ts-nbus.c | 25 --
drivers/gpio/gpio-max3191x.c | 23 +-
drivers/gpio/gpiolib.c | 279 ++++++++++++++++++++++------
drivers/gpio/gpiolib.h | 15 +
drivers/i2c/muxes/i2c-mux-gpio.c | 5
drivers/mmc/core/pwrseq_simple.c | 15 -
drivers/mux/gpio.c | 7
drivers/net/phy/mdio-mux-gpio.c | 5
drivers/pcmcia/soc_common.c | 14 -
drivers/phy/motorola/phy-mapphone-mdm6600.c | 21 +-
drivers/staging/iio/adc/ad7606.c | 12 -
drivers/tty/serial/serial_mctrl_gpio.c | 9
include/linux/gpio/consumer.h | 35 ++-
16 files changed, 410 insertions(+), 182 deletions(-)
^ permalink raw reply [flat|nested] 75+ messages in thread
* [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
@ 2018-08-20 23:43 ` Janusz Krzysztofik
2018-08-21 6:49 ` Peter Rosin
2018-08-29 12:03 ` Miguel Ojeda
2018-08-20 23:43 ` [RFC RFT PATCH v4 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
` (5 subsequent siblings)
6 siblings, 2 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-20 23:43 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Greg Kroah-Hartman,
Jiri Slaby, linux-gpio, linux-doc, linux-i2c
Most users of get/set array functions iterate consecutive bits of data,
usually a single integer, while or processing array of results obtained
from or building an array of values to be passed to those functions.
Save time wasted on those iterations by changing the functions' API to
accept bitmaps.
All current users are updated as well.
More benefits from the change are expected as soon as planned support
for accepting/passing those bitmaps directly from/to respective GPIO
chip callbacks if applicable is implemented.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 22 ++++----
drivers/auxdisplay/hd44780.c | 52 +++++++++--------
drivers/bus/ts-nbus.c | 19 ++-----
drivers/gpio/gpio-max3191x.c | 17 +++---
drivers/gpio/gpiolib.c | 86 +++++++++++++++--------------
drivers/gpio/gpiolib.h | 4 +-
drivers/i2c/muxes/i2c-mux-gpio.c | 3 +-
drivers/mmc/core/pwrseq_simple.c | 13 ++---
drivers/mux/gpio.c | 4 +-
drivers/net/phy/mdio-mux-gpio.c | 3 +-
drivers/pcmcia/soc_common.c | 11 ++--
drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 +++---
drivers/staging/iio/adc/ad7606.c | 9 +--
drivers/tty/serial/serial_mctrl_gpio.c | 7 ++-
include/linux/gpio/consumer.h | 18 +++---
15 files changed, 138 insertions(+), 147 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index aa03f389d41d..ed68042ddccf 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -323,29 +323,29 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
GPIOs belonging to the same bank or chip simultaneously if supported by the
@@ -356,8 +356,8 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
- * value_array - an array to store the GPIOs' values (get) or
- an array of values to assign to the GPIOs (set)
+ * value_bitmap - a bitmap to store the GPIOs' values (get) or
+ a bitmap of values to assign to the GPIOs (set)
The descriptor array can be obtained using the gpiod_get_array() function
or one of its variants. If the group of descriptors returned by that function
@@ -366,7 +366,7 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_values);
+ my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index f1a42f0f1ded..d340473aa142 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -62,20 +62,19 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
/* write to an LCD panel register in 8 bit GPIO mode */
static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW */
- unsigned int i, n;
+ unsigned long value_bitmap[1]; /* for DATA[0-7], RS, RW */
+ unsigned int n;
- for (i = 0; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
+ value_bitmap[0] = val;
+ __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
n = 9;
if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
+ __clear_bit(PIN_CTRL_RW, value_bitmap);
n++;
}
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -83,32 +82,31 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
/* write to an LCD panel register in 4 bit GPIO mode */
static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
- unsigned int i, n;
+ /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ unsigned long value_bitmap[0];
+ unsigned int n;
/* High nibble + RS, RW */
- for (i = 4; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
+ value_bitmap[0] = val;
+ __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
n = 5;
if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
+ __clear_bit(PIN_CTRL_RW, value_bitmap);
n++;
}
+ value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
/* Low nibble */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(val & BIT(i));
+ value_bitmap[0] &= ~((1 << PIN_DATA4) - 1);
+ value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -155,23 +153,23 @@ static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)
/* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ unsigned long value_bitmap[1];
struct hd44780 *hd = lcd->drvdata;
- unsigned int i, n;
+ unsigned int n;
/* Command nibble + RS, RW */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(cmd & BIT(i));
- values[PIN_CTRL_RS] = 0;
+ value_bitmap[0] = cmd << PIN_DATA4;
+ __clear_bit(PIN_CTRL_RS, value_bitmap);
n = 5;
if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
+ __clear_bit(PIN_CTRL_RW, value_bitmap);
n++;
}
+ value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 073fd9011154..ce6c1e89236d 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -110,13 +110,9 @@ static void ts_nbus_set_direction(struct ts_nbus *ts_nbus, int direction)
*/
static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
- int i;
- int values[8];
-
- for (i = 0; i < 8; i++)
- values[i] = 0;
+ unsigned long value_bitmap[1] = { 0, };
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, value_bitmap);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -157,16 +153,9 @@ static int ts_nbus_read_byte(struct ts_nbus *ts_nbus, u8 *val)
static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
{
struct gpio_descs *gpios = ts_nbus->data;
- int i;
- int values[8];
-
- for (i = 0; i < 8; i++)
- if (byte & BIT(i))
- values[i] = 1;
- else
- values[i] = 0;
+ unsigned long value_bitmap[1] = { byte, };
- gpiod_set_array_value_cansleep(8, gpios->desc, values);
+ gpiod_set_array_value_cansleep(8, gpios->desc, value_bitmap);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index b5b9cb1fda50..c4ec1c82af27 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -315,17 +315,20 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
int value)
{
- int i, *values;
+ unsigned long *value_bitmap;
- values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
- if (!values)
+ value_bitmap = kmalloc_array(BITS_TO_LONGS(ndescs),
+ sizeof(*value_bitmap), GFP_KERNEL);
+ if (!value_bitmap)
return;
- for (i = 0; i < ndescs; i++)
- values[i] = value;
+ if (value)
+ bitmap_fill(value_bitmap, ndescs);
+ else
+ bitmap_zero(value_bitmap, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(ndescs, desc, value_bitmap);
+ kfree(value_bitmap);
}
static struct gpio_descs *devm_gpiod_get_array_optional_count(
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8f8a1999393..f0e9ffa8cab6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -427,7 +427,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
struct linehandle_state *lh = filep->private_data;
void __user *ip = (void __user *)arg;
struct gpiohandle_data ghd;
- int vals[GPIOHANDLES_MAX];
+ unsigned long value_bitmap[BITS_TO_LONGS(GPIOHANDLES_MAX)];
int i;
if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
@@ -436,13 +436,13 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
- vals);
+ value_bitmap);
if (ret)
return ret;
memset(&ghd, 0, sizeof(ghd));
for (i = 0; i < lh->numdescs; i++)
- ghd.values[i] = vals[i];
+ ghd.values[i] = test_bit(i, value_bitmap);
if (copy_to_user(ip, &ghd, sizeof(ghd)))
return -EFAULT;
@@ -461,14 +461,14 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
/* Clamp all values to [0,1] */
for (i = 0; i < lh->numdescs; i++)
- vals[i] = !!ghd.values[i];
+ __assign_bit(i, value_bitmap, !!ghd.values[i]);
/* Reuse the array setting function */
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
lh->descs,
- vals);
+ value_bitmap);
}
return -EINVAL;
}
@@ -2784,7 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -2835,7 +2835,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
- value_array[j] = value;
+ __assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
}
@@ -2895,9 +2895,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
/**
* gpiod_get_raw_array_value() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -2907,20 +2907,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
/**
* gpiod_get_array_value() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitnap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -2929,12 +2930,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3027,7 +3029,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -3056,7 +3058,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
do {
struct gpio_desc *desc = desc_array[i];
int hwgpio = gpio_chip_hwgpio(desc);
- int value = value_array[i];
+ int value = test_bit(i, value_bitmap);
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
@@ -3152,9 +3154,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
/**
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3163,20 +3165,21 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
* complain if the GPIO chip functions potentially sleep.
*/
int gpiod_set_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
/**
* gpiod_set_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3185,12 +3188,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
* complain if the GPIO chip functions potentially sleep.
*/
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3410,9 +3414,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
/**
* gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -3422,21 +3426,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
/**
* gpiod_get_array_value_cansleep() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -3445,13 +3449,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3493,9 +3497,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
/**
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3504,13 +3508,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3533,9 +3537,9 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
/**
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3544,13 +3548,13 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index a7e49fef73d4..11e83d2eef89 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -187,11 +187,11 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 401308e3d036..d675e0ca2fa4 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -27,13 +27,14 @@ struct gpiomux {
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
+ unsigned long value_bitmap[1] = { val, };
int i;
for (i = 0; i < mux->data.n_gpios; i++)
mux->values[i] = (val >> i) & 1;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, mux->values);
+ mux->gpios, value_bitmap);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index a8b9fee4d62a..0d6e3a5be3ba 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -40,18 +40,13 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
if (!IS_ERR(reset_gpios)) {
- int i, *values;
+ unsigned long value_bitmap[1];
int nvalues = reset_gpios->ndescs;
- values = kmalloc_array(nvalues, sizeof(int), GFP_KERNEL);
- if (!values)
- return;
+ value_bitmap[0] = value;
- for (i = 0; i < nvalues; i++)
- values[i] = value;
-
- gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
+ value_bitmap);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 6fdd9316db8b..cc2d5f50472a 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -23,14 +23,14 @@ struct mux_gpio {
static int mux_gpio_set(struct mux_control *mux, int state)
{
struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
+ unsigned long value_bitmap[1] = { state, };
int i;
for (i = 0; i < mux_gpio->gpios->ndescs; i++)
mux_gpio->val[i] = (state >> i) & 1;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc,
- mux_gpio->val);
+ mux_gpio->gpios->desc, value_bitmap);
return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index bc90764a8b8d..8e1ec750277e 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -27,6 +27,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
void *data)
{
struct mdio_mux_gpio_state *s = data;
+ unsigned long value_bitmap[1] = { desired_child, };
unsigned int n;
if (current_child == desired_child)
@@ -36,7 +37,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
s->values[n] = (desired_child >> n) & 1;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- s->values);
+ value_bitmap);
return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index c5f2344c189b..e0f89155c474 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -351,19 +351,22 @@ static int soc_common_pcmcia_config_skt(
if (ret == 0) {
struct gpio_desc *descs[2];
- int values[2], n = 0;
+ unsigned long value_bitmap[1];
+ int n = 0;
if (skt->gpio_reset) {
descs[n] = skt->gpio_reset;
- values[n++] = !!(state->flags & SS_RESET);
+ __assign_bit(n++, value_bitmap,
+ !!(state->flags & SS_RESET));
}
if (skt->gpio_bus_enable) {
descs[n] = skt->gpio_bus_enable;
- values[n++] = !!(state->flags & SS_OUTPUT_ENA);
+ __assign_bit(n++, value_bitmap,
+ !!(state->flags & SS_OUTPUT_ENA));
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, values);
+ gpiod_set_array_value_cansleep(n, descs, value_bitmap);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 0075fb0bef8c..b6477c3599c4 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -157,15 +157,12 @@ static const struct phy_ops gpio_usb_ops = {
*/
static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
{
- int values[PHY_MDM6600_NR_CMD_LINES];
- int i;
+ unsigned long value_bitmap[1];
- val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
- for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
- values[i] = (val & BIT(i)) >> i;
+ value_bitmap[0] = val & ((1 << PHY_MDM6600_NR_CMD_LINES) - 1);
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, values);
+ ddata->cmd_gpios->desc, value_bitmap);
}
/**
@@ -176,7 +173,7 @@ static void phy_mdm6600_status(struct work_struct *work)
{
struct phy_mdm6600 *ddata;
struct device *dev;
- int values[PHY_MDM6600_NR_STATUS_LINES];
+ unsigned long value_bitmap[1] = { 0, };
int error, i, val = 0;
ddata = container_of(work, struct phy_mdm6600, status_work.work);
@@ -184,14 +181,14 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
- values);
+ value_bitmap);
if (error)
return;
for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
- val |= values[i] << i;
+ val |= test_bit(i, value_bitmap) << i;
dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
- __func__, i, values[i], val);
+ __func__, i, test_bit(i, value_bitmap), val);
}
ddata->status = val;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 25b9fcd5e3a4..0eca047bc1cc 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -202,7 +202,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
- int values[3];
+ unsigned long value_bitmap[1];
int ret, i;
switch (mask) {
@@ -227,13 +227,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
- values[0] = (ret >> 0) & 1;
- values[1] = (ret >> 1) & 1;
- values[2] = (ret >> 2) & 1;
+ value_bitmap[0] = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- values);
+ gpiod_set_array_value(3, st->gpio_os->desc, value_bitmap);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 1c06325beaca..bb8b4756d72d 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -40,7 +40,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
{
enum mctrl_gpio_idx i;
struct gpio_desc *desc_array[UART_GPIO_MAX];
- int value_array[UART_GPIO_MAX];
+ unsigned long value_bitmap[BITS_TO_LONGS(UART_GPIO_MAX)];
unsigned int count = 0;
if (gpios == NULL)
@@ -49,10 +49,11 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
for (i = 0; i < UART_GPIO_MAX; i++)
if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
desc_array[count] = gpios->gpio[i];
- value_array[count] = !!(mctrl & mctrl_gpios_desc[i].mctrl);
+ __assign_bit(count, value_bitmap,
+ !!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_array);
+ gpiod_set_array_value(count, desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 21ddbe440030..1b21dc7b0fad 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -104,36 +104,38 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [RFC RFT PATCH v4 2/4] gpiolib: Identify arrays matching GPIO hardware
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-08-20 23:43 ` Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
` (4 subsequent siblings)
6 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-20 23:43 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, netdev, linux-i2c, Peter Meerwald-Stadler,
devel, Florian Fainelli, Jonathan Corbet, Janusz Krzysztofik,
Kishon Vijay Abraham I, linux-serial, Jiri Slaby,
Michael Hennerich, linux-gpio, Lars-Peter Clausen,
Greg Kroah-Hartman, linux-mmc, linux-kernel, Peter Rosin,
Miguel Ojeda Sandonis, Peter Korsgaard, Hartmut Knaack
Certain GPIO array lookup results may map directly to GPIO pins of a
single GPIO chip in hardware order. If that condition is recognized
and handled efficiently, significant performance gain of get/set array
functions may be possible.
While processing a request for an array of GPIO descriptors, identify
those which represent corresponding pins of a single GPIO chip. Skip
over pins which require open source or open drain special processing.
Moreover, identify pins which require inversion. Pass a pointer to
that information with the array to the caller so it can benefit from
enhanced performance as soon as get/set array functions can accept and
make efficient use of it.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 4 +-
drivers/gpio/gpiolib.c | 72 +++++++++++++++++++++++++++++-
drivers/gpio/gpiolib.h | 9 ++++
include/linux/gpio/consumer.h | 9 ++++
4 files changed, 92 insertions(+), 2 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index ed68042ddccf..7e0298b9a7b9 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -109,9 +109,11 @@ For a function using multiple GPIOs all of those can be obtained with one call::
enum gpiod_flags flags)
This function returns a struct gpio_descs which contains an array of
-descriptors::
+descriptors. It also contains a pointer to a gpiolib private structure which,
+if passed back to get/set array functions, may speed up I/O proocessing::
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f0e9ffa8cab6..c1ed1c759345 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4174,7 +4174,9 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
{
struct gpio_desc *desc;
struct gpio_descs *descs;
- int count;
+ struct gpio_array *array_info = NULL;
+ struct gpio_chip *chip;
+ int count, bitmap_size;
count = gpiod_count(dev, con_id);
if (count < 0)
@@ -4190,9 +4192,77 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
gpiod_put_array(descs);
return ERR_CAST(desc);
}
+
descs->desc[descs->ndescs] = desc;
+
+ chip = gpiod_to_chip(desc);
+ /*
+ * Select a chip of first array member
+ * whose index matches its pin hardware number
+ * as a candidate for fast bitmap processing.
+ */
+ if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) {
+ struct gpio_descs *array;
+
+ bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
+ chip->ngpio : count);
+
+ array = kzalloc(struct_size(descs, desc, count) +
+ struct_size(array_info, invert_mask,
+ 3 * bitmap_size), GFP_KERNEL);
+ if (!array) {
+ gpiod_put_array(descs);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ memcpy(array, descs,
+ struct_size(descs, desc, descs->ndescs + 1));
+ kfree(descs);
+
+ descs = array;
+ array_info = (void *)(descs->desc + count);
+ array_info->get_mask = array_info->invert_mask +
+ bitmap_size;
+ array_info->set_mask = array_info->get_mask +
+ bitmap_size;
+
+ array_info->desc = descs->desc;
+ array_info->size = count;
+ array_info->chip = chip;
+ bitmap_set(array_info->get_mask, descs->ndescs,
+ count - descs->ndescs);
+ bitmap_set(array_info->set_mask, descs->ndescs,
+ count - descs->ndescs);
+ descs->info = array_info;
+ }
+ /*
+ * Unmark members which don't qualify for fast bitmap
+ * processing (different chip, not in hardware order)
+ */
+ if (array_info && (chip != array_info->chip ||
+ gpio_chip_hwgpio(desc) != descs->ndescs)) {
+ __clear_bit(descs->ndescs, array_info->get_mask);
+ __clear_bit(descs->ndescs, array_info->set_mask);
+ } else if (array_info) {
+ /* Exclude open drain or open source from fast output */
+ if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
+ gpiochip_line_is_open_source(chip, descs->ndescs))
+ __clear_bit(descs->ndescs,
+ array_info->set_mask);
+ /* Identify 'fast' pins which require invertion */
+ if (gpiod_is_active_low(desc))
+ __set_bit(descs->ndescs,
+ array_info->invert_mask);
+ }
+
descs->ndescs++;
}
+ if (array_info)
+ dev_dbg(dev,
+ "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
+ array_info->chip->label, array_info->size,
+ *array_info->get_mask, *array_info->set_mask,
+ *array_info->invert_mask);
return descs;
}
EXPORT_SYMBOL_GPL(gpiod_get_array);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 11e83d2eef89..b60905d558b1 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -183,6 +183,15 @@ static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
}
#endif
+struct gpio_array {
+ struct gpio_desc **desc;
+ unsigned int size;
+ struct gpio_chip *chip;
+ unsigned long *get_mask;
+ unsigned long *set_mask;
+ unsigned long invert_mask[];
+};
+
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 1b21dc7b0fad..8dede3e886af 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -17,11 +17,20 @@ struct device;
*/
struct gpio_desc;
+/**
+ * Opaque descriptor for a structure of GPIO array attributes. This structure
+ * is attached to struct gpiod_descs obtained from gpiod_get_array() and can be
+ * passed back to get/set array functions in order to activate fast processing
+ * path if applicable.
+ */
+struct gpio_array;
+
/**
* Struct containing an array of descriptors that can be obtained using
* gpiod_get_array().
*/
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
};
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [RFC RFT PATCH v4 3/4] gpiolib: Pass array info to get/set array functions
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
@ 2018-08-20 23:43 ` Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
` (3 subsequent siblings)
6 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-20 23:43 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, netdev, linux-i2c, Peter Meerwald-Stadler,
devel, Florian Fainelli, Jonathan Corbet, Janusz Krzysztofik,
Kishon Vijay Abraham I, linux-serial, Jiri Slaby,
Michael Hennerich, linux-gpio, Lars-Peter Clausen,
Greg Kroah-Hartman, linux-mmc, linux-kernel, Peter Rosin,
Miguel Ojeda Sandonis, Peter Korsgaard, Hartmut Knaack
In order to make use of array info obtained from gpiod_get_array() and
speed up processing of arrays matching single GPIO chip layout, that
information must be passed to get/set array functions. Extend the
functions' API with that additional parameter and update all users.
Pass NULL if a user bulids an array itself from single GPIOs.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 14 ++++++++++--
drivers/auxdisplay/hd44780.c | 12 ++++++----
drivers/bus/ts-nbus.c | 6 +++--
drivers/gpio/gpio-max3191x.c | 6 +++--
drivers/gpio/gpiolib.c | 34 ++++++++++++++++++++---------
drivers/gpio/gpiolib.h | 2 ++
drivers/i2c/muxes/i2c-mux-gpio.c | 2 +-
drivers/mmc/core/pwrseq_simple.c | 2 +-
drivers/mux/gpio.c | 3 ++-
drivers/net/phy/mdio-mux-gpio.c | 2 +-
drivers/pcmcia/soc_common.c | 3 ++-
drivers/phy/motorola/phy-mapphone-mdm6600.c | 4 +++-
drivers/staging/iio/adc/ad7606.c | 3 ++-
drivers/tty/serial/serial_mctrl_gpio.c | 2 +-
include/linux/gpio/consumer.h | 8 +++++++
15 files changed, 75 insertions(+), 28 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 7e0298b9a7b9..0afd95a12b10 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -325,28 +325,36 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
@@ -358,6 +366,7 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
+ * array_info - optional information obtained from gpiod_array_get()
* value_bitmap - a bitmap to store the GPIOs' values (get) or
a bitmap of values to assign to the GPIOs (set)
@@ -368,12 +377,13 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_value_bitmap);
+ my_gpio_descs->info, my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
gpiod_get_array(). Afterwards the array of descriptors has to be setup
-manually before it can be passed to one of the above functions.
+manually before it can be passed to one of the above functions. In that case,
+array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index d340473aa142..6ae81632bc44 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -74,7 +74,8 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
}
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -97,7 +98,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
@@ -106,7 +108,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -169,7 +172,8 @@ static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index ce6c1e89236d..000d756eb42c 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -112,7 +112,8 @@ static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
unsigned long value_bitmap[1] = { 0, };
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc,
+ ts_nbus->data->info, value_bitmap);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -155,7 +156,8 @@ static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
struct gpio_descs *gpios = ts_nbus->data;
unsigned long value_bitmap[1] = { byte, };
- gpiod_set_array_value_cansleep(8, gpios->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, gpios->desc, gpios->info,
+ value_bitmap);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index c4ec1c82af27..4b43b5dabfd2 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -313,6 +313,7 @@ static int max3191x_set_config(struct gpio_chip *gpio, unsigned int offset,
static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
+ struct gpio_array *info,
int value)
{
unsigned long *value_bitmap;
@@ -327,7 +328,7 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
else
bitmap_zero(value_bitmap, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, value_bitmap);
+ gpiod_set_array_value_cansleep(ndescs, desc, info, value_bitmap);
kfree(value_bitmap);
}
@@ -400,7 +401,8 @@ static int max3191x_probe(struct spi_device *spi)
if (max3191x->modesel_pins)
gpiod_set_array_single_value_cansleep(
max3191x->modesel_pins->ndescs,
- max3191x->modesel_pins->desc, max3191x->mode);
+ max3191x->modesel_pins->desc,
+ max3191x->modesel_pins->info, max3191x->mode);
max3191x->ignore_uv = device_property_read_bool(dev,
"maxim,ignore-undervoltage");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c1ed1c759345..4d26cdbdb7cf 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -435,7 +435,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
int ret = gpiod_get_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
if (ret)
return ret;
@@ -467,7 +467,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
}
return -EINVAL;
@@ -2784,6 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -2908,12 +2909,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
*/
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
@@ -2931,12 +2934,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
*/
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3029,6 +3034,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -3166,12 +3172,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
*/
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
@@ -3189,12 +3196,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
*/
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3426,13 +3434,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
@@ -3449,13 +3459,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3508,13 +3520,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3548,13 +3561,14 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index b60905d558b1..b65ca896b24d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -196,10 +196,12 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index d675e0ca2fa4..aa3857ab42b5 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -34,7 +34,7 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
mux->values[i] = (val >> i) & 1;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, value_bitmap);
+ mux->gpios, NULL, value_bitmap);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 0d6e3a5be3ba..5cf7eda8f68f 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -46,7 +46,7 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
value_bitmap[0] = value;
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
- value_bitmap);
+ reset_gpios->info, value_bitmap);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index cc2d5f50472a..879f9f3f45dd 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -30,7 +30,8 @@ static int mux_gpio_set(struct mux_control *mux, int state)
mux_gpio->val[i] = (state >> i) & 1;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc, value_bitmap);
+ mux_gpio->gpios->desc,
+ mux_gpio->gpios->info, value_bitmap);
return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index 8e1ec750277e..c0ffa03c916b 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -37,7 +37,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
s->values[n] = (desired_child >> n) & 1;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- value_bitmap);
+ s->gpios->info, value_bitmap);
return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index e0f89155c474..55978198cd2b 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -366,7 +366,8 @@ static int soc_common_pcmcia_config_skt(
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, value_bitmap);
+ gpiod_set_array_value_cansleep(n, descs, NULL,
+ value_bitmap);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index b6477c3599c4..8f508338ec56 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -162,7 +162,8 @@ static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
value_bitmap[0] = val & ((1 << PHY_MDM6600_NR_CMD_LINES) - 1);
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, value_bitmap);
+ ddata->cmd_gpios->desc,
+ ddata->cmd_gpios->info, value_bitmap);
}
/**
@@ -181,6 +182,7 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
+ ddata->status_gpios->info,
value_bitmap);
if (error)
return;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 0eca047bc1cc..eb779d825724 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -230,7 +230,8 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
value_bitmap[0] = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(3, st->gpio_os->desc, value_bitmap);
+ gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
+ value_bitmap);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index bb8b4756d72d..8a04e3be5419 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -53,7 +53,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
!!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_bitmap);
+ gpiod_set_array_value(count, desc_array, NULL, value_bitmap);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 8dede3e886af..bf037ebe2ed8 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -114,36 +114,44 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [RFC RFT PATCH v4 4/4] gpiolib: Implement fast processing path in get/set array
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (2 preceding siblings ...)
2018-08-20 23:43 ` [RFC RFT PATCH v4 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
@ 2018-08-20 23:43 ` Janusz Krzysztofik
2018-08-29 9:06 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Linus Walleij
` (2 subsequent siblings)
6 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-20 23:43 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Greg Kroah-Hartman,
Jiri Slaby, linux-gpio, linux-doc, linux-i2c
Certain GPIO descriptor arrays returned by gpio_get_array() may contain
information on direct mapping of array members to pins of a single GPIO
chip in hardware order. In such cases, bitmaps of values can be passed
directly from/to the chip's .get/set_multiple() callbacks without
wasting time on iterations.
Add respective code to gpiod_get/set_array_bitmap_complex() functions.
Pins not applicable for fast path are processed as before, skipping
over the 'fast' ones.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/board.rst | 15 ++++++
Documentation/driver-api/gpio/consumer.rst | 8 +++
drivers/gpio/gpiolib.c | 87 ++++++++++++++++++++++++++++--
3 files changed, 105 insertions(+), 5 deletions(-)
diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
index 2c112553df84..c66821e033c2 100644
--- a/Documentation/driver-api/gpio/board.rst
+++ b/Documentation/driver-api/gpio/board.rst
@@ -193,3 +193,18 @@ And the table can be added to the board code as follows::
The line will be hogged as soon as the gpiochip is created or - in case the
chip was created earlier - when the hog table is registered.
+
+Arrays of pins
+--------------
+In addition to requesting pins belonging to a function one by one, a device may
+also request an array of pins assigned to the function. The way those pins are
+mapped to the device determines if the array qualifies for fast bitmap
+processing. If yes, a bitmap is passed over get/set array functions directly
+between a caller and a respective .get/set_multiple() callback of a GPIO chip.
+
+In order to qualify for fast bitmap processing, the pin mapping must meet the
+following requirements:
+- it must belong to the same chip as other 'fast' pins of the function,
+- its index within the function must match its hardware number within the chip.
+
+Open drain and open source pins are excluded from fast bitmap output processing.
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 0afd95a12b10..cf992e5ab976 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -388,6 +388,14 @@ array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
+Still better performance may be achieved if array indexes of the descriptors
+match hardware pin numbers of a single chip. If an array passed to a get/set
+array function matches the one obtained from gpiod_get_array() and array_info
+associated with the array is also passed, the function may take a fast bitmap
+processing path, passing the value_bitmap argument directly to the respective
+.get/set_multiple() callback of the chip. That allows for utilization of GPIO
+banks as data I/O ports without much loss of performance.
+
The return value of gpiod_get_array_value() and its variants is 0 on success
or negative on error. Note the difference to gpiod_get_value(), which returns
0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4d26cdbdb7cf..b799a89c4c17 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2787,7 +2787,36 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
- int i = 0;
+ int err, i = 0;
+
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ err = gpio_chip_get_multiple(array_info->chip,
+ array_info->get_mask,
+ value_bitmap);
+ if (err)
+ return err;
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ if (bitmap_full(array_info->get_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->get_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
@@ -2818,7 +2847,12 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
__set_bit(hwgpio, mask);
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
@@ -2829,7 +2863,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
return ret;
}
- for (j = first; j < i; j++) {
+ for (j = first; j < i; ) {
const struct gpio_desc *desc = desc_array[j];
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(hwgpio, bits);
@@ -2838,6 +2872,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
value = !value;
__assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask, i, j);
+ else
+ j++;
}
if (mask != fastpath)
@@ -3039,6 +3078,32 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
{
int i = 0;
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
+ value_bitmap);
+
+ if (bitmap_full(array_info->set_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->set_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
+
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
@@ -3066,7 +3131,14 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(i, value_bitmap);
- if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+ /*
+ * Pins applicable for fast input but not for
+ * fast output processing may have been already
+ * inverted inside the fast path, skip them.
+ */
+ if (!raw && !(array_info &&
+ test_bit(i, array_info->invert_mask)) &&
+ test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
trace_gpio_value(desc_to_gpio(desc), 0, value);
/*
@@ -3085,7 +3157,12 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
__clear_bit(hwgpio, bits);
count++;
}
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->set_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-20 23:43 ` [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-08-21 6:49 ` Peter Rosin
2018-08-21 6:52 ` Peter Rosin
2018-08-29 12:03 ` Miguel Ojeda
1 sibling, 1 reply; 75+ messages in thread
From: Peter Rosin @ 2018-08-21 6:49 UTC (permalink / raw)
To: Janusz Krzysztofik, Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Greg Kroah-Hartman, Jiri Slaby,
linux-gpio, linux-doc, linux-i2c, linux-mmc
On 2018-08-21 01:43, Janusz Krzysztofik wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while or processing array of results obtained
> from or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> ---
> Documentation/driver-api/gpio/consumer.rst | 22 ++++----
> drivers/auxdisplay/hd44780.c | 52 +++++++++--------
> drivers/bus/ts-nbus.c | 19 ++-----
> drivers/gpio/gpio-max3191x.c | 17 +++---
> drivers/gpio/gpiolib.c | 86 +++++++++++++++--------------
> drivers/gpio/gpiolib.h | 4 +-
> drivers/i2c/muxes/i2c-mux-gpio.c | 3 +-
> drivers/mmc/core/pwrseq_simple.c | 13 ++---
> drivers/mux/gpio.c | 4 +-
> drivers/net/phy/mdio-mux-gpio.c | 3 +-
> drivers/pcmcia/soc_common.c | 11 ++--
> drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 +++---
> drivers/staging/iio/adc/ad7606.c | 9 +--
> drivers/tty/serial/serial_mctrl_gpio.c | 7 ++-
> include/linux/gpio/consumer.h | 18 +++---
> 15 files changed, 138 insertions(+), 147 deletions(-)
>
*snip*
> diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
> index 401308e3d036..d675e0ca2fa4 100644
> --- a/drivers/i2c/muxes/i2c-mux-gpio.c
> +++ b/drivers/i2c/muxes/i2c-mux-gpio.c
> @@ -27,13 +27,14 @@ struct gpiomux {
>
> static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
> {
> + unsigned long value_bitmap[1] = { val, };
> int i;
>
> for (i = 0; i < mux->data.n_gpios; i++)
> mux->values[i] = (val >> i) & 1;
>
> gpiod_set_array_value_cansleep(mux->data.n_gpios,
> - mux->gpios, mux->values);
> + mux->gpios, value_bitmap);
> }
>
> static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
Please take the opportunity to completely get rid of the values member
in struct mux_gpio. It no longer serves any purpose.
*snip*
> diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
> index 6fdd9316db8b..cc2d5f50472a 100644
> --- a/drivers/mux/gpio.c
> +++ b/drivers/mux/gpio.c
> @@ -23,14 +23,14 @@ struct mux_gpio {
> static int mux_gpio_set(struct mux_control *mux, int state)
> {
> struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
> + unsigned long value_bitmap[1] = { state, };
> int i;
>
> for (i = 0; i < mux_gpio->gpios->ndescs; i++)
> mux_gpio->val[i] = (state >> i) & 1;
>
> gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
> - mux_gpio->gpios->desc,
> - mux_gpio->val);
> + mux_gpio->gpios->desc, value_bitmap);
>
> return 0;
> }
Dito (but the member name is val).
*snip*
Cheers,
Peter
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-21 6:49 ` Peter Rosin
@ 2018-08-21 6:52 ` Peter Rosin
0 siblings, 0 replies; 75+ messages in thread
From: Peter Rosin @ 2018-08-21 6:52 UTC (permalink / raw)
To: Janusz Krzysztofik, Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Greg Kroah-Hartman, Jiri Slaby,
linux-gpio, linux-doc, linux-i2c, linux-mmc
Sorry for replying to self...
On 2018-08-21 08:49, Peter Rosin wrote:
> On 2018-08-21 01:43, Janusz Krzysztofik wrote:
>> Most users of get/set array functions iterate consecutive bits of data,
>> usually a single integer, while or processing array of results obtained
>> from or building an array of values to be passed to those functions.
>> Save time wasted on those iterations by changing the functions' API to
>> accept bitmaps.
>>
>> All current users are updated as well.
>>
>> More benefits from the change are expected as soon as planned support
>> for accepting/passing those bitmaps directly from/to respective GPIO
>> chip callbacks if applicable is implemented.
>>
>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>> ---
>> Documentation/driver-api/gpio/consumer.rst | 22 ++++----
>> drivers/auxdisplay/hd44780.c | 52 +++++++++--------
>> drivers/bus/ts-nbus.c | 19 ++-----
>> drivers/gpio/gpio-max3191x.c | 17 +++---
>> drivers/gpio/gpiolib.c | 86 +++++++++++++++--------------
>> drivers/gpio/gpiolib.h | 4 +-
>> drivers/i2c/muxes/i2c-mux-gpio.c | 3 +-
>> drivers/mmc/core/pwrseq_simple.c | 13 ++---
>> drivers/mux/gpio.c | 4 +-
>> drivers/net/phy/mdio-mux-gpio.c | 3 +-
>> drivers/pcmcia/soc_common.c | 11 ++--
>> drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 +++---
>> drivers/staging/iio/adc/ad7606.c | 9 +--
>> drivers/tty/serial/serial_mctrl_gpio.c | 7 ++-
>> include/linux/gpio/consumer.h | 18 +++---
>> 15 files changed, 138 insertions(+), 147 deletions(-)
>>
>
> *snip*
>
>> diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
>> index 401308e3d036..d675e0ca2fa4 100644
>> --- a/drivers/i2c/muxes/i2c-mux-gpio.c
>> +++ b/drivers/i2c/muxes/i2c-mux-gpio.c
>> @@ -27,13 +27,14 @@ struct gpiomux {
>>
>> static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
>> {
>> + unsigned long value_bitmap[1] = { val, };
>> int i;
>>
>> for (i = 0; i < mux->data.n_gpios; i++)
>> mux->values[i] = (val >> i) & 1;
>>
>> gpiod_set_array_value_cansleep(mux->data.n_gpios,
>> - mux->gpios, mux->values);
>> + mux->gpios, value_bitmap);
>> }
>>
>> static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
>
> Please take the opportunity to completely get rid of the values member
> in struct mux_gpio. It no longer serves any purpose.
struct gpiomux
>
> *snip*
>
>> diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
>> index 6fdd9316db8b..cc2d5f50472a 100644
>> --- a/drivers/mux/gpio.c
>> +++ b/drivers/mux/gpio.c
>> @@ -23,14 +23,14 @@ struct mux_gpio {
>> static int mux_gpio_set(struct mux_control *mux, int state)
>> {
>> struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
>> + unsigned long value_bitmap[1] = { state, };
>> int i;
>>
>> for (i = 0; i < mux_gpio->gpios->ndescs; i++)
>> mux_gpio->val[i] = (state >> i) & 1;
>>
>> gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
>> - mux_gpio->gpios->desc,
>> - mux_gpio->val);
>> + mux_gpio->gpios->desc, value_bitmap);
>>
>> return 0;
>> }
>
> Dito (but the member name is val).
Here is where struct mux_gpio fits.
Cheers,
Peter
>
> *snip*
>
> Cheers,
> Peter
>
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (3 preceding siblings ...)
2018-08-20 23:43 ` [RFC RFT PATCH v4 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
@ 2018-08-29 9:06 ` Linus Walleij
2018-08-29 18:16 ` Janusz Krzysztofik
2018-08-29 10:19 ` Ulf Hansson
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
6 siblings, 1 reply; 75+ messages in thread
From: Linus Walleij @ 2018-08-29 9:06 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, kishon, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald, Greg KH, Jiri Slaby, open list:GPIO SUBSYSTEM,
linux-doc, linux-i2c
On Tue, Aug 21, 2018 at 1:42 AM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> This series is a follow up of the former "mtd: rawnand: ams-delta: Use
> gpio-omap accessors for data I/O" which already contained some changes
> to gpiolib. Those previous attempts were commented by Borris Brezillon
> who suggested using GPIO API modified to accept bitmaps, and by Linus
> Walleij who suggested still more great ideas for further immprovement
> of the proposed API changes - thanks!
>
> The goal is to boost performans of get/set array functions while
> processing GPIO arrays which represent pins of a signle chip in
> hardware order. If resulting performance is close to PIO, GPIO API
> can be used for data I/O without much loss of speed.
Hands down, this is a very pretty patch set. I'm a big fan already.
This is mainly because it fulfills the requirement for libraries
to be narrow and deep, which is what we want.
This refers to John Ousterhouts software design philosophy,
here is a great lecture if you haven't seen it already:
https://www.youtube.com/watch?v=bmSAYlu0NcY
Let's get this into v1 and get some testing and merge it for v4.20
ASAP so we get some proper testing before the v4.20 merge
window. It would be excellent if some of the current users of
the array API could provide tested-by's or at least ACKs.
For example ts-nbus.c must be a big benefactor.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (4 preceding siblings ...)
2018-08-29 9:06 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Linus Walleij
@ 2018-08-29 10:19 ` Ulf Hansson
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
6 siblings, 0 replies; 75+ messages in thread
From: Ulf Hansson @ 2018-08-29 10:19 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Greg Kroah-Hartman,
Jiri Slaby, linux-gpio, linux-doc, linux-i2c
On 21 August 2018 at 01:43, Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
>
> This series is a follow up of the former "mtd: rawnand: ams-delta: Use
> gpio-omap accessors for data I/O" which already contained some changes
> to gpiolib. Those previous attempts were commented by Borris Brezillon
> who suggested using GPIO API modified to accept bitmaps, and by Linus
> Walleij who suggested still more great ideas for further immprovement
> of the proposed API changes - thanks!
>
> The goal is to boost performans of get/set array functions while
> processing GPIO arrays which represent pins of a signle chip in
> hardware order. If resulting performance is close to PIO, GPIO API
> can be used for data I/O without much loss of speed.
>
> Created and tested on a low end Amstrad Delta board with NAND driver
> updated to use GPIO API for data I/O. Performance degrade compared to
> PIO is much better than before the optimization but still not quite
> satisfactory.
>
>
> Janusz Krzysztofik (4):
> gpiolib: Pass bitmaps, not integer arrays, to get/set array
> gpiolib: Identify arrays matching GPIO hardware
> gpiolib: Pass array info to get/set array functions
> gpiolib: Implement fast processing path in get/set array
>
>
> Documentation/driver-api/gpio/board.rst | 15 +
> Documentation/driver-api/gpio/consumer.rst | 48 +++-
> drivers/auxdisplay/hd44780.c | 64 +++---
> drivers/bus/ts-nbus.c | 25 --
> drivers/gpio/gpio-max3191x.c | 23 +-
> drivers/gpio/gpiolib.c | 279 ++++++++++++++++++++++------
> drivers/gpio/gpiolib.h | 15 +
> drivers/i2c/muxes/i2c-mux-gpio.c | 5
> drivers/mmc/core/pwrseq_simple.c | 15 -
> drivers/mux/gpio.c | 7
> drivers/net/phy/mdio-mux-gpio.c | 5
> drivers/pcmcia/soc_common.c | 14 -
> drivers/phy/motorola/phy-mapphone-mdm6600.c | 21 +-
> drivers/staging/iio/adc/ad7606.c | 12 -
> drivers/tty/serial/serial_mctrl_gpio.c | 9
> include/linux/gpio/consumer.h | 35 ++-
> 16 files changed, 410 insertions(+), 182 deletions(-)
>
For the mmc related changes:
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Kind regards
Uffe
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-20 23:43 ` [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-21 6:49 ` Peter Rosin
@ 2018-08-29 12:03 ` Miguel Ojeda
2018-08-29 18:01 ` Janusz Krzysztofik
1 sibling, 1 reply; 75+ messages in thread
From: Miguel Ojeda @ 2018-08-29 12:03 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Andrew Lunn, Ulf Hansson, Linux Doc Mailing List, linux-iio,
Linus Walleij, Dominik Brodowski, Network Development, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Kishon Vijay Abraham I, Willy Tarreau, Geert Uytterhoeven,
linux-serial, Jiri Slaby, Michael Hennerich, linux-gpio,
Lars-Peter Clausen, Greg Kroah-Hartman, linux-mmc, linux-kernel,
Peter Rosin
Hi Janusz,
On Tue, Aug 21, 2018 at 1:43 AM, Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while or processing array of results obtained
> from or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> ---
> Documentation/driver-api/gpio/consumer.rst | 22 ++++----
> drivers/auxdisplay/hd44780.c | 52 +++++++++--------
[CC'ing Willy and Geert for hd44780]
> diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
> index f1a42f0f1ded..d340473aa142 100644
> --- a/drivers/auxdisplay/hd44780.c
> +++ b/drivers/auxdisplay/hd44780.c
> @@ -62,20 +62,19 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> /* write to an LCD panel register in 8 bit GPIO mode */
> static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW */
> - unsigned int i, n;
> + unsigned long value_bitmap[1]; /* for DATA[0-7], RS, RW */
Why [1]? I understand it is because in other cases it may be more than
one, but...
> + unsigned int n;
>
> - for (i = 0; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> + value_bitmap[0] = val;
> + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> n = 9;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
> n++;
> }
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
>
> hd44780_strobe_gpio(hd);
> }
> @@ -83,32 +82,31 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> /* write to an LCD panel register in 4 bit GPIO mode */
> static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> - unsigned int i, n;
> + /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> + unsigned long value_bitmap[0];
This one is even more strange... :-)
> + unsigned int n;
>
> /* High nibble + RS, RW */
> - for (i = 4; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> + value_bitmap[0] = val;
> + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> n = 5;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
> n++;
> }
> + value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
Maybe >>=?
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> - &values[PIN_DATA4]);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
>
> hd44780_strobe_gpio(hd);
>
> /* Low nibble */
> - for (i = 0; i < 4; i++)
> - values[PIN_DATA4 + i] = !!(val & BIT(i));
> + value_bitmap[0] &= ~((1 << PIN_DATA4) - 1);
> + value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
Are you sure this is correct? You are basically doing an or of
value_bitmap and val and clearing the low-nibble.
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> - &values[PIN_DATA4]);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
>
> hd44780_strobe_gpio(hd);
> }
Cheers,
Miguel
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-29 12:03 ` Miguel Ojeda
@ 2018-08-29 18:01 ` Janusz Krzysztofik
0 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-29 18:01 UTC (permalink / raw)
To: Miguel Ojeda
Cc: Linus Walleij, Jonathan Corbet, Peter Korsgaard, Peter Rosin,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Greg Kroah-Hartman, Jiri Slaby,
linux-gpio, Linux Doc Mailing List
On Wednesday, August 29, 2018 2:03:18 PM CEST Miguel Ojeda wrote:
> Hi Janusz,
>
> On Tue, Aug 21, 2018 at 1:43 AM, Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> > Most users of get/set array functions iterate consecutive bits of data,
> > usually a single integer, while or processing array of results obtained
> > from or building an array of values to be passed to those functions.
> > Save time wasted on those iterations by changing the functions' API to
> > accept bitmaps.
> >
> > All current users are updated as well.
> >
> > More benefits from the change are expected as soon as planned support
> > for accepting/passing those bitmaps directly from/to respective GPIO
> > chip callbacks if applicable is implemented.
> >
> > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> > ---
> > Documentation/driver-api/gpio/consumer.rst | 22 ++++----
> > drivers/auxdisplay/hd44780.c | 52 +++++++++--------
>
> [CC'ing Willy and Geert for hd44780]
>
> > diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
> > index f1a42f0f1ded..d340473aa142 100644
> > --- a/drivers/auxdisplay/hd44780.c
> > +++ b/drivers/auxdisplay/hd44780.c
> > @@ -62,20 +62,19 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> > /* write to an LCD panel register in 8 bit GPIO mode */
> > static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> > {
> > - int values[10]; /* for DATA[0-7], RS, RW */
> > - unsigned int i, n;
> > + unsigned long value_bitmap[1]; /* for DATA[0-7], RS, RW */
>
> Why [1]? I understand it is because in other cases it may be more than
> one,
Yes, I tried to point out the fact the new API accepts a bitmap of an arbitrary
length, and I tried to use the same code pattern across changes to the API
users.
> but...
>
> > + unsigned int n;
> >
> > - for (i = 0; i < 8; i++)
> > - values[PIN_DATA0 + i] = !!(val & BIT(i));
> > - values[PIN_CTRL_RS] = rs;
> > + value_bitmap[0] = val;
> > + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> > n = 9;
> > if (hd->pins[PIN_CTRL_RW]) {
> > - values[PIN_CTRL_RW] = 0;
> > + __clear_bit(PIN_CTRL_RW, value_bitmap);
> > n++;
> > }
> >
> > /* Present the data to the port */
> > - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
> > + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
> >
> > hd44780_strobe_gpio(hd);
> > }
> > @@ -83,32 +82,31 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> > /* write to an LCD panel register in 4 bit GPIO mode */
> > static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
> > {
> > - int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> > - unsigned int i, n;
> > + /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> > + unsigned long value_bitmap[0];
>
> This one is even more strange... :-)
This one is an error, should be 1 of course :-), thanks.
> > + unsigned int n;
> >
> > /* High nibble + RS, RW */
> > - for (i = 4; i < 8; i++)
> > - values[PIN_DATA0 + i] = !!(val & BIT(i));
> > - values[PIN_CTRL_RS] = rs;
> > + value_bitmap[0] = val;
> > + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> > n = 5;
> > if (hd->pins[PIN_CTRL_RW]) {
> > - values[PIN_CTRL_RW] = 0;
> > + __clear_bit(PIN_CTRL_RW, value_bitmap);
> > n++;
> > }
> > + value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
>
> Maybe >>=?
OK.
Answering you question below:
To make my changes as clear as I could imagine, I decided to use the same indexing as in the original code, i.e., assign high nibble of val to bits 4-7 and two other values - rs and an optional 0 - to bits 8 and 9, respectively.
Unlike in case of array of integers, where for the high nibble part you could just pass a pointer to a sub-array starting at the 5th value (i.e., &values[PIN_DATA4]), it was not possible to do the same for and arbitrary bit of a bitmap, e.g., pass a pointer to the 5th bit of *value_bitmap as an argument pointing to bit 0 of a bitmap to be processed. That's why I shifted the bitmap right by 4 bits.
Then, ...
> >
> > /* Present the data to the port */
> > - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> > - &values[PIN_DATA4]);
> > + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
> >
> > hd44780_strobe_gpio(hd);
> >
> > /* Low nibble */
> > - for (i = 0; i < 4; i++)
> > - values[PIN_DATA4 + i] = !!(val & BIT(i));
> > + value_bitmap[0] &= ~((1 << PIN_DATA4) - 1);
> > + value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
>
> Are you sure this is correct? You are basically doing an or of
> value_bitmap and val and clearing the low-nibble.
having the rs and optional 0 already assigned to bits 4 and 5 of the bitmap, I just cleared bits 0-3 still containing the high nibble of val and assigned the low nibble of it to those bits, getting a result ready to be passed as an argument to gpiod_set_array_value_cansleep() below.
I hope I didn't miss anything.
Thanks,
Janusz
> >
> > /* Present the data to the port */
> > - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> > - &values[PIN_DATA4]);
> > + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
> >
> > hd44780_strobe_gpio(hd);
> > }
>
> Cheers,
> Miguel
>
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing
2018-08-29 9:06 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Linus Walleij
@ 2018-08-29 18:16 ` Janusz Krzysztofik
0 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-29 18:16 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, kishon, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald, Greg KH, Jiri Slaby, open list:GPIO SUBSYSTEM,
linux-doc, linux-i2c
Hi Linus,
On Wednesday, August 29, 2018 11:06:21 AM CEST Linus Walleij wrote:
> On Tue, Aug 21, 2018 at 1:42 AM Janusz Krzysztofik <jmkrzyszt@gmail.com>
wrote:
>
> > This series is a follow up of the former "mtd: rawnand: ams-delta: Use
> > gpio-omap accessors for data I/O" which already contained some changes
> > to gpiolib. Those previous attempts were commented by Borris Brezillon
> > who suggested using GPIO API modified to accept bitmaps, and by Linus
> > Walleij who suggested still more great ideas for further immprovement
> > of the proposed API changes - thanks!
> >
> > The goal is to boost performans of get/set array functions while
> > processing GPIO arrays which represent pins of a signle chip in
> > hardware order. If resulting performance is close to PIO, GPIO API
> > can be used for data I/O without much loss of speed.
>
> Hands down, this is a very pretty patch set. I'm a big fan already.
>
> This is mainly because it fulfills the requirement for libraries
> to be narrow and deep, which is what we want.
> This refers to John Ousterhouts software design philosophy,
> here is a great lecture if you haven't seen it already:
> https://www.youtube.com/watch?v=bmSAYlu0NcY
>
> Let's get this into v1 and get some testing and merge it for v4.20
> ASAP
Please hold on for a while, I'm going to resubmit soon, with the comment from
Peter Rosin on i2c-mux-gpio addressed and the error discovered by Miguel Ojeda
in hd44780 fixed.
Thanks,
Janusz
> so we get some proper testing before the v4.20 merge
> window. It would be excellent if some of the current users of
> the array API could provide tested-by's or at least ACKs.
>
> For example ts-nbus.c must be a big benefactor.
>
> Yours,
> Linus Walleij
>
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATH v5 0/4] gpiolib: speed up GPIO array processing
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (5 preceding siblings ...)
2018-08-29 10:19 ` Ulf Hansson
@ 2018-08-29 20:48 ` Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (4 more replies)
6 siblings, 5 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-29 20:48 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Kishon Vijay Abraham I, Geert Uytterhoeven, linux-serial,
Jiri Slaby, Michael Hennerich, linux-gpio, Lars-Peter Clausen,
Greg Kroah-Hartman, linux-mmc, linux-kernel, Willy Tarreau,
Miguel Ojeda Sandonis, Peter Korsgaard
The goal is to boost performance of get/set array functions while
processing GPIO arrays which represent pins of a signle chip in
hardware order. If resulting performance is close to PIO, GPIO API
can be used for data I/O without much loss of speed.
Created and tested on a low end Amstrad Delta board with NAND driver
updated to use GPIO API for data I/O. Performance degrade compared to
PIO is much better than before the optimization but still not quite
satisfactory.
Janusz Krzysztofik (4):
gpiolib: Pass bitmaps, not integer arrays, to get/set array
gpiolib: Identify arrays matching GPIO hardware
gpiolib: Pass array info to get/set array functions
gpiolib: Implement fast processing path in get/set array
Changelog:
v5:
[PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set
- drivers/i2c/muxes/i2c-mux-gpio.c:
- drop assigment of values to struct gpiomux.values, as recommended
by Peter Rosin - thanks!,
- mark the .values member of the structure as obsolete,
- drivers/mux/gpio.c:
- drop assigment of values to struct mux_gpio.val, also recommended
by Peter Rosin - thanks!,
- merk the .val member of the structure as obsolete,
- drivers/auxdisplay/hd44780.c:
- fix incorrect bitmap size,
- use >>= operator to simplify notation,
both catched by Miguel Ojeda - thanks!,
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware
- add Cc: clause.
[PATCH v5 3/4] gpiolib: Pass array info to get/set array functions
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 4/4] gpiolib: Implement fast processing path in get/set
- add Cc: clause.
v4:
That series was a follow up of the former "mtd: rawnand: ams-delta: Use
gpio-omap accessors for data I/O" which already contained some changes
to gpiolib. Those previous attempts were commented by Borris Brezillon
who suggested using GPIO API modified to accept bitmaps, and by Linus
Walleij who suggested still more great ideas for further immprovement
of the proposed API changes - thanks!
diffstat:
Documentation/driver-api/gpio/board.rst | 15 +
Documentation/driver-api/gpio/consumer.rst | 48 +++-
drivers/auxdisplay/hd44780.c | 64 +++---
drivers/bus/ts-nbus.c | 25 --
drivers/gpio/gpio-max3191x.c | 23 +-
drivers/gpio/gpiolib.c | 279 ++++++++++++++++++++++------
drivers/gpio/gpiolib.h | 15 +
drivers/i2c/muxes/i2c-mux-gpio.c | 10 -
drivers/mmc/core/pwrseq_simple.c | 15 -
drivers/mux/gpio.c | 12 -
drivers/net/phy/mdio-mux-gpio.c | 5
drivers/pcmcia/soc_common.c | 14 -
drivers/phy/motorola/phy-mapphone-mdm6600.c | 21 +-
drivers/staging/iio/adc/ad7606.c | 12 -
drivers/tty/serial/serial_mctrl_gpio.c | 9
include/linux/gpio/consumer.h | 35 ++-
16 files changed, 412 insertions(+), 190 deletions(-)
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
@ 2018-08-29 20:48 ` Janusz Krzysztofik
2018-08-30 4:30 ` Peter Rosin
` (3 more replies)
2018-08-29 20:48 ` [PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
` (3 subsequent siblings)
4 siblings, 4 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-29 20:48 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Most users of get/set array functions iterate consecutive bits of data,
usually a single integer, while processing array of results obtained
from, or building an array of values to be passed to those functions.
Save time wasted on those iterations by changing the functions' API to
accept bitmaps.
All current users are updated as well.
More benefits from the change are expected as soon as planned support
for accepting/passing those bitmaps directly from/to respective GPIO
chip callbacks if applicable is implemented.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
---
Documentation/driver-api/gpio/consumer.rst | 22 ++++----
drivers/auxdisplay/hd44780.c | 52 +++++++++--------
drivers/bus/ts-nbus.c | 19 ++-----
drivers/gpio/gpio-max3191x.c | 17 +++---
drivers/gpio/gpiolib.c | 86 +++++++++++++++--------------
drivers/gpio/gpiolib.h | 4 +-
drivers/i2c/muxes/i2c-mux-gpio.c | 8 +--
drivers/mmc/core/pwrseq_simple.c | 13 ++---
drivers/mux/gpio.c | 9 +--
drivers/net/phy/mdio-mux-gpio.c | 3 +-
drivers/pcmcia/soc_common.c | 11 ++--
drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 +++---
drivers/staging/iio/adc/ad7606.c | 9 +--
drivers/tty/serial/serial_mctrl_gpio.c | 7 ++-
include/linux/gpio/consumer.h | 18 +++---
15 files changed, 140 insertions(+), 155 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index aa03f389d41d..ed68042ddccf 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -323,29 +323,29 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
GPIOs belonging to the same bank or chip simultaneously if supported by the
@@ -356,8 +356,8 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
- * value_array - an array to store the GPIOs' values (get) or
- an array of values to assign to the GPIOs (set)
+ * value_bitmap - a bitmap to store the GPIOs' values (get) or
+ a bitmap of values to assign to the GPIOs (set)
The descriptor array can be obtained using the gpiod_get_array() function
or one of its variants. If the group of descriptors returned by that function
@@ -366,7 +366,7 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_values);
+ my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index f1a42f0f1ded..bbbd6a29bf01 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -62,20 +62,19 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
/* write to an LCD panel register in 8 bit GPIO mode */
static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW */
- unsigned int i, n;
+ unsigned long value_bitmap[1]; /* for DATA[0-7], RS, RW */
+ unsigned int n;
- for (i = 0; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
+ value_bitmap[0] = val;
+ __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
n = 9;
if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
+ __clear_bit(PIN_CTRL_RW, value_bitmap);
n++;
}
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -83,32 +82,31 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
/* write to an LCD panel register in 4 bit GPIO mode */
static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
- unsigned int i, n;
+ /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ unsigned long value_bitmap[1];
+ unsigned int n;
/* High nibble + RS, RW */
- for (i = 4; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
+ value_bitmap[0] = val;
+ __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
n = 5;
if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
+ __clear_bit(PIN_CTRL_RW, value_bitmap);
n++;
}
+ value_bitmap[0] >>= PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
/* Low nibble */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(val & BIT(i));
+ value_bitmap[0] &= ~((1 << PIN_DATA4) - 1);
+ value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -155,23 +153,23 @@ static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)
/* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ unsigned long value_bitmap[1];
struct hd44780 *hd = lcd->drvdata;
- unsigned int i, n;
+ unsigned int n;
/* Command nibble + RS, RW */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(cmd & BIT(i));
- values[PIN_CTRL_RS] = 0;
+ value_bitmap[0] = cmd << PIN_DATA4;
+ __clear_bit(PIN_CTRL_RS, value_bitmap);
n = 5;
if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
+ __clear_bit(PIN_CTRL_RW, value_bitmap);
n++;
}
+ value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 073fd9011154..ce6c1e89236d 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -110,13 +110,9 @@ static void ts_nbus_set_direction(struct ts_nbus *ts_nbus, int direction)
*/
static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
- int i;
- int values[8];
-
- for (i = 0; i < 8; i++)
- values[i] = 0;
+ unsigned long value_bitmap[1] = { 0, };
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, value_bitmap);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -157,16 +153,9 @@ static int ts_nbus_read_byte(struct ts_nbus *ts_nbus, u8 *val)
static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
{
struct gpio_descs *gpios = ts_nbus->data;
- int i;
- int values[8];
-
- for (i = 0; i < 8; i++)
- if (byte & BIT(i))
- values[i] = 1;
- else
- values[i] = 0;
+ unsigned long value_bitmap[1] = { byte, };
- gpiod_set_array_value_cansleep(8, gpios->desc, values);
+ gpiod_set_array_value_cansleep(8, gpios->desc, value_bitmap);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index b5b9cb1fda50..c4ec1c82af27 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -315,17 +315,20 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
int value)
{
- int i, *values;
+ unsigned long *value_bitmap;
- values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
- if (!values)
+ value_bitmap = kmalloc_array(BITS_TO_LONGS(ndescs),
+ sizeof(*value_bitmap), GFP_KERNEL);
+ if (!value_bitmap)
return;
- for (i = 0; i < ndescs; i++)
- values[i] = value;
+ if (value)
+ bitmap_fill(value_bitmap, ndescs);
+ else
+ bitmap_zero(value_bitmap, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(ndescs, desc, value_bitmap);
+ kfree(value_bitmap);
}
static struct gpio_descs *devm_gpiod_get_array_optional_count(
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8f8a1999393..f0e9ffa8cab6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -427,7 +427,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
struct linehandle_state *lh = filep->private_data;
void __user *ip = (void __user *)arg;
struct gpiohandle_data ghd;
- int vals[GPIOHANDLES_MAX];
+ unsigned long value_bitmap[BITS_TO_LONGS(GPIOHANDLES_MAX)];
int i;
if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
@@ -436,13 +436,13 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
- vals);
+ value_bitmap);
if (ret)
return ret;
memset(&ghd, 0, sizeof(ghd));
for (i = 0; i < lh->numdescs; i++)
- ghd.values[i] = vals[i];
+ ghd.values[i] = test_bit(i, value_bitmap);
if (copy_to_user(ip, &ghd, sizeof(ghd)))
return -EFAULT;
@@ -461,14 +461,14 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
/* Clamp all values to [0,1] */
for (i = 0; i < lh->numdescs; i++)
- vals[i] = !!ghd.values[i];
+ __assign_bit(i, value_bitmap, !!ghd.values[i]);
/* Reuse the array setting function */
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
lh->descs,
- vals);
+ value_bitmap);
}
return -EINVAL;
}
@@ -2784,7 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -2835,7 +2835,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
- value_array[j] = value;
+ __assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
}
@@ -2895,9 +2895,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
/**
* gpiod_get_raw_array_value() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -2907,20 +2907,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
/**
* gpiod_get_array_value() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitnap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -2929,12 +2930,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3027,7 +3029,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -3056,7 +3058,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
do {
struct gpio_desc *desc = desc_array[i];
int hwgpio = gpio_chip_hwgpio(desc);
- int value = value_array[i];
+ int value = test_bit(i, value_bitmap);
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
@@ -3152,9 +3154,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
/**
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3163,20 +3165,21 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
* complain if the GPIO chip functions potentially sleep.
*/
int gpiod_set_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
/**
* gpiod_set_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3185,12 +3188,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
* complain if the GPIO chip functions potentially sleep.
*/
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3410,9 +3414,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
/**
* gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -3422,21 +3426,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
/**
* gpiod_get_array_value_cansleep() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -3445,13 +3449,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3493,9 +3497,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
/**
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3504,13 +3508,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3533,9 +3537,9 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
/**
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3544,13 +3548,13 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index a7e49fef73d4..11e83d2eef89 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -187,11 +187,11 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 401308e3d036..4e36e0eac7a3 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -22,18 +22,16 @@ struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
struct gpio_desc **gpios;
- int *values;
+ int *values; /* FIXME: no longer needed */
};
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
+ unsigned long value_bitmap[1] = { val, };
int i;
- for (i = 0; i < mux->data.n_gpios; i++)
- mux->values[i] = (val >> i) & 1;
-
gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, mux->values);
+ mux->gpios, value_bitmap);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index a8b9fee4d62a..0d6e3a5be3ba 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -40,18 +40,13 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
if (!IS_ERR(reset_gpios)) {
- int i, *values;
+ unsigned long value_bitmap[1];
int nvalues = reset_gpios->ndescs;
- values = kmalloc_array(nvalues, sizeof(int), GFP_KERNEL);
- if (!values)
- return;
+ value_bitmap[0] = value;
- for (i = 0; i < nvalues; i++)
- values[i] = value;
-
- gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
+ value_bitmap);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 6fdd9316db8b..734e1b43aed6 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -17,20 +17,17 @@
struct mux_gpio {
struct gpio_descs *gpios;
- int *val;
+ int *val; /* FIXME: no longer needed */
};
static int mux_gpio_set(struct mux_control *mux, int state)
{
struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
+ unsigned long value_bitmap[1] = { state, };
int i;
- for (i = 0; i < mux_gpio->gpios->ndescs; i++)
- mux_gpio->val[i] = (state >> i) & 1;
-
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc,
- mux_gpio->val);
+ mux_gpio->gpios->desc, value_bitmap);
return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index bc90764a8b8d..8e1ec750277e 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -27,6 +27,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
void *data)
{
struct mdio_mux_gpio_state *s = data;
+ unsigned long value_bitmap[1] = { desired_child, };
unsigned int n;
if (current_child == desired_child)
@@ -36,7 +37,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
s->values[n] = (desired_child >> n) & 1;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- s->values);
+ value_bitmap);
return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index c5f2344c189b..e0f89155c474 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -351,19 +351,22 @@ static int soc_common_pcmcia_config_skt(
if (ret == 0) {
struct gpio_desc *descs[2];
- int values[2], n = 0;
+ unsigned long value_bitmap[1];
+ int n = 0;
if (skt->gpio_reset) {
descs[n] = skt->gpio_reset;
- values[n++] = !!(state->flags & SS_RESET);
+ __assign_bit(n++, value_bitmap,
+ !!(state->flags & SS_RESET));
}
if (skt->gpio_bus_enable) {
descs[n] = skt->gpio_bus_enable;
- values[n++] = !!(state->flags & SS_OUTPUT_ENA);
+ __assign_bit(n++, value_bitmap,
+ !!(state->flags & SS_OUTPUT_ENA));
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, values);
+ gpiod_set_array_value_cansleep(n, descs, value_bitmap);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 0075fb0bef8c..b6477c3599c4 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -157,15 +157,12 @@ static const struct phy_ops gpio_usb_ops = {
*/
static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
{
- int values[PHY_MDM6600_NR_CMD_LINES];
- int i;
+ unsigned long value_bitmap[1];
- val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
- for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
- values[i] = (val & BIT(i)) >> i;
+ value_bitmap[0] = val & ((1 << PHY_MDM6600_NR_CMD_LINES) - 1);
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, values);
+ ddata->cmd_gpios->desc, value_bitmap);
}
/**
@@ -176,7 +173,7 @@ static void phy_mdm6600_status(struct work_struct *work)
{
struct phy_mdm6600 *ddata;
struct device *dev;
- int values[PHY_MDM6600_NR_STATUS_LINES];
+ unsigned long value_bitmap[1] = { 0, };
int error, i, val = 0;
ddata = container_of(work, struct phy_mdm6600, status_work.work);
@@ -184,14 +181,14 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
- values);
+ value_bitmap);
if (error)
return;
for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
- val |= values[i] << i;
+ val |= test_bit(i, value_bitmap) << i;
dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
- __func__, i, values[i], val);
+ __func__, i, test_bit(i, value_bitmap), val);
}
ddata->status = val;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 25b9fcd5e3a4..0eca047bc1cc 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -202,7 +202,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
- int values[3];
+ unsigned long value_bitmap[1];
int ret, i;
switch (mask) {
@@ -227,13 +227,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
- values[0] = (ret >> 0) & 1;
- values[1] = (ret >> 1) & 1;
- values[2] = (ret >> 2) & 1;
+ value_bitmap[0] = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- values);
+ gpiod_set_array_value(3, st->gpio_os->desc, value_bitmap);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 1c06325beaca..bb8b4756d72d 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -40,7 +40,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
{
enum mctrl_gpio_idx i;
struct gpio_desc *desc_array[UART_GPIO_MAX];
- int value_array[UART_GPIO_MAX];
+ unsigned long value_bitmap[BITS_TO_LONGS(UART_GPIO_MAX)];
unsigned int count = 0;
if (gpios == NULL)
@@ -49,10 +49,11 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
for (i = 0; i < UART_GPIO_MAX; i++)
if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
desc_array[count] = gpios->gpio[i];
- value_array[count] = !!(mctrl & mctrl_gpios_desc[i].mctrl);
+ __assign_bit(count, value_bitmap,
+ !!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_array);
+ gpiod_set_array_value(count, desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 21ddbe440030..1b21dc7b0fad 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -104,36 +104,38 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-08-29 20:48 ` Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
` (2 subsequent siblings)
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-29 20:48 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Geert Uytterhoeven,
linux-serial, Jiri Slaby, Michael Hennerich, linux-gpio,
Lars-Peter Clausen, Greg Kroah-Hartman, linux-mmc, linux-kernel,
Willy Tarreau, Miguel Ojeda Sandonis
Certain GPIO array lookup results may map directly to GPIO pins of a
single GPIO chip in hardware order. If that condition is recognized
and handled efficiently, significant performance gain of get/set array
functions may be possible.
While processing a request for an array of GPIO descriptors, identify
those which represent corresponding pins of a single GPIO chip. Skip
over pins which require open source or open drain special processing.
Moreover, identify pins which require inversion. Pass a pointer to
that information with the array to the caller so it can benefit from
enhanced performance as soon as get/set array functions can accept and
make efficient use of it.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 4 +-
drivers/gpio/gpiolib.c | 72 +++++++++++++++++++++++++++++-
drivers/gpio/gpiolib.h | 9 ++++
include/linux/gpio/consumer.h | 9 ++++
4 files changed, 92 insertions(+), 2 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index ed68042ddccf..7e0298b9a7b9 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -109,9 +109,11 @@ For a function using multiple GPIOs all of those can be obtained with one call::
enum gpiod_flags flags)
This function returns a struct gpio_descs which contains an array of
-descriptors::
+descriptors. It also contains a pointer to a gpiolib private structure which,
+if passed back to get/set array functions, may speed up I/O proocessing::
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f0e9ffa8cab6..c1ed1c759345 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4174,7 +4174,9 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
{
struct gpio_desc *desc;
struct gpio_descs *descs;
- int count;
+ struct gpio_array *array_info = NULL;
+ struct gpio_chip *chip;
+ int count, bitmap_size;
count = gpiod_count(dev, con_id);
if (count < 0)
@@ -4190,9 +4192,77 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
gpiod_put_array(descs);
return ERR_CAST(desc);
}
+
descs->desc[descs->ndescs] = desc;
+
+ chip = gpiod_to_chip(desc);
+ /*
+ * Select a chip of first array member
+ * whose index matches its pin hardware number
+ * as a candidate for fast bitmap processing.
+ */
+ if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) {
+ struct gpio_descs *array;
+
+ bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
+ chip->ngpio : count);
+
+ array = kzalloc(struct_size(descs, desc, count) +
+ struct_size(array_info, invert_mask,
+ 3 * bitmap_size), GFP_KERNEL);
+ if (!array) {
+ gpiod_put_array(descs);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ memcpy(array, descs,
+ struct_size(descs, desc, descs->ndescs + 1));
+ kfree(descs);
+
+ descs = array;
+ array_info = (void *)(descs->desc + count);
+ array_info->get_mask = array_info->invert_mask +
+ bitmap_size;
+ array_info->set_mask = array_info->get_mask +
+ bitmap_size;
+
+ array_info->desc = descs->desc;
+ array_info->size = count;
+ array_info->chip = chip;
+ bitmap_set(array_info->get_mask, descs->ndescs,
+ count - descs->ndescs);
+ bitmap_set(array_info->set_mask, descs->ndescs,
+ count - descs->ndescs);
+ descs->info = array_info;
+ }
+ /*
+ * Unmark members which don't qualify for fast bitmap
+ * processing (different chip, not in hardware order)
+ */
+ if (array_info && (chip != array_info->chip ||
+ gpio_chip_hwgpio(desc) != descs->ndescs)) {
+ __clear_bit(descs->ndescs, array_info->get_mask);
+ __clear_bit(descs->ndescs, array_info->set_mask);
+ } else if (array_info) {
+ /* Exclude open drain or open source from fast output */
+ if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
+ gpiochip_line_is_open_source(chip, descs->ndescs))
+ __clear_bit(descs->ndescs,
+ array_info->set_mask);
+ /* Identify 'fast' pins which require invertion */
+ if (gpiod_is_active_low(desc))
+ __set_bit(descs->ndescs,
+ array_info->invert_mask);
+ }
+
descs->ndescs++;
}
+ if (array_info)
+ dev_dbg(dev,
+ "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
+ array_info->chip->label, array_info->size,
+ *array_info->get_mask, *array_info->set_mask,
+ *array_info->invert_mask);
return descs;
}
EXPORT_SYMBOL_GPL(gpiod_get_array);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 11e83d2eef89..b60905d558b1 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -183,6 +183,15 @@ static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
}
#endif
+struct gpio_array {
+ struct gpio_desc **desc;
+ unsigned int size;
+ struct gpio_chip *chip;
+ unsigned long *get_mask;
+ unsigned long *set_mask;
+ unsigned long invert_mask[];
+};
+
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 1b21dc7b0fad..8dede3e886af 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -17,11 +17,20 @@ struct device;
*/
struct gpio_desc;
+/**
+ * Opaque descriptor for a structure of GPIO array attributes. This structure
+ * is attached to struct gpiod_descs obtained from gpiod_get_array() and can be
+ * passed back to get/set array functions in order to activate fast processing
+ * path if applicable.
+ */
+struct gpio_array;
+
/**
* Struct containing an array of descriptors that can be obtained using
* gpiod_get_array().
*/
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
};
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v5 3/4] gpiolib: Pass array info to get/set array functions
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
@ 2018-08-29 20:48 ` Janusz Krzysztofik
2018-08-29 20:49 ` [PATCH v5 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-29 20:48 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
In order to make use of array info obtained from gpiod_get_array() and
speed up processing of arrays matching single GPIO chip layout, that
information must be passed to get/set array functions. Extend the
functions' API with that additional parameter and update all users.
Pass NULL if a user bulids an array itself from single GPIOs.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
---
Documentation/driver-api/gpio/consumer.rst | 14 ++++++++++--
drivers/auxdisplay/hd44780.c | 12 ++++++----
drivers/bus/ts-nbus.c | 6 +++--
drivers/gpio/gpio-max3191x.c | 6 +++--
drivers/gpio/gpiolib.c | 34 ++++++++++++++++++++---------
drivers/gpio/gpiolib.h | 2 ++
drivers/i2c/muxes/i2c-mux-gpio.c | 2 +-
drivers/mmc/core/pwrseq_simple.c | 2 +-
drivers/mux/gpio.c | 3 ++-
drivers/net/phy/mdio-mux-gpio.c | 2 +-
drivers/pcmcia/soc_common.c | 3 ++-
drivers/phy/motorola/phy-mapphone-mdm6600.c | 4 +++-
drivers/staging/iio/adc/ad7606.c | 3 ++-
drivers/tty/serial/serial_mctrl_gpio.c | 2 +-
include/linux/gpio/consumer.h | 8 +++++++
15 files changed, 75 insertions(+), 28 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 7e0298b9a7b9..0afd95a12b10 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -325,28 +325,36 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
@@ -358,6 +366,7 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
+ * array_info - optional information obtained from gpiod_array_get()
* value_bitmap - a bitmap to store the GPIOs' values (get) or
a bitmap of values to assign to the GPIOs (set)
@@ -368,12 +377,13 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_value_bitmap);
+ my_gpio_descs->info, my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
gpiod_get_array(). Afterwards the array of descriptors has to be setup
-manually before it can be passed to one of the above functions.
+manually before it can be passed to one of the above functions. In that case,
+array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index bbbd6a29bf01..ec20c41831b0 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -74,7 +74,8 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
}
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -97,7 +98,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
value_bitmap[0] >>= PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
@@ -106,7 +108,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -169,7 +172,8 @@ static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index ce6c1e89236d..000d756eb42c 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -112,7 +112,8 @@ static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
unsigned long value_bitmap[1] = { 0, };
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc,
+ ts_nbus->data->info, value_bitmap);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -155,7 +156,8 @@ static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
struct gpio_descs *gpios = ts_nbus->data;
unsigned long value_bitmap[1] = { byte, };
- gpiod_set_array_value_cansleep(8, gpios->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, gpios->desc, gpios->info,
+ value_bitmap);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index c4ec1c82af27..4b43b5dabfd2 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -313,6 +313,7 @@ static int max3191x_set_config(struct gpio_chip *gpio, unsigned int offset,
static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
+ struct gpio_array *info,
int value)
{
unsigned long *value_bitmap;
@@ -327,7 +328,7 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
else
bitmap_zero(value_bitmap, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, value_bitmap);
+ gpiod_set_array_value_cansleep(ndescs, desc, info, value_bitmap);
kfree(value_bitmap);
}
@@ -400,7 +401,8 @@ static int max3191x_probe(struct spi_device *spi)
if (max3191x->modesel_pins)
gpiod_set_array_single_value_cansleep(
max3191x->modesel_pins->ndescs,
- max3191x->modesel_pins->desc, max3191x->mode);
+ max3191x->modesel_pins->desc,
+ max3191x->modesel_pins->info, max3191x->mode);
max3191x->ignore_uv = device_property_read_bool(dev,
"maxim,ignore-undervoltage");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c1ed1c759345..4d26cdbdb7cf 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -435,7 +435,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
int ret = gpiod_get_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
if (ret)
return ret;
@@ -467,7 +467,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
}
return -EINVAL;
@@ -2784,6 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -2908,12 +2909,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
*/
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
@@ -2931,12 +2934,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
*/
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3029,6 +3034,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -3166,12 +3172,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
*/
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
@@ -3189,12 +3196,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
*/
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3426,13 +3434,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
@@ -3449,13 +3459,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3508,13 +3520,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3548,13 +3561,14 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index b60905d558b1..b65ca896b24d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -196,10 +196,12 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 4e36e0eac7a3..4439a92c86a2 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -31,7 +31,7 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
int i;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, value_bitmap);
+ mux->gpios, NULL, value_bitmap);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 0d6e3a5be3ba..5cf7eda8f68f 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -46,7 +46,7 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
value_bitmap[0] = value;
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
- value_bitmap);
+ reset_gpios->info, value_bitmap);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 734e1b43aed6..be8c86680e10 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -27,7 +27,8 @@ static int mux_gpio_set(struct mux_control *mux, int state)
int i;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc, value_bitmap);
+ mux_gpio->gpios->desc,
+ mux_gpio->gpios->info, value_bitmap);
return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index 8e1ec750277e..c0ffa03c916b 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -37,7 +37,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
s->values[n] = (desired_child >> n) & 1;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- value_bitmap);
+ s->gpios->info, value_bitmap);
return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index e0f89155c474..55978198cd2b 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -366,7 +366,8 @@ static int soc_common_pcmcia_config_skt(
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, value_bitmap);
+ gpiod_set_array_value_cansleep(n, descs, NULL,
+ value_bitmap);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index b6477c3599c4..8f508338ec56 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -162,7 +162,8 @@ static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
value_bitmap[0] = val & ((1 << PHY_MDM6600_NR_CMD_LINES) - 1);
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, value_bitmap);
+ ddata->cmd_gpios->desc,
+ ddata->cmd_gpios->info, value_bitmap);
}
/**
@@ -181,6 +182,7 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
+ ddata->status_gpios->info,
value_bitmap);
if (error)
return;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 0eca047bc1cc..eb779d825724 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -230,7 +230,8 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
value_bitmap[0] = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(3, st->gpio_os->desc, value_bitmap);
+ gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
+ value_bitmap);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index bb8b4756d72d..8a04e3be5419 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -53,7 +53,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
!!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_bitmap);
+ gpiod_set_array_value(count, desc_array, NULL, value_bitmap);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 8dede3e886af..bf037ebe2ed8 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -114,36 +114,44 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v5 4/4] gpiolib: Implement fast processing path in get/set array
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
` (2 preceding siblings ...)
2018-08-29 20:48 ` [PATCH v5 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
@ 2018-08-29 20:49 ` Janusz Krzysztofik
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-29 20:49 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Certain GPIO descriptor arrays returned by gpio_get_array() may contain
information on direct mapping of array members to pins of a single GPIO
chip in hardware order. In such cases, bitmaps of values can be passed
directly from/to the chip's .get/set_multiple() callbacks without
wasting time on iterations.
Add respective code to gpiod_get/set_array_bitmap_complex() functions.
Pins not applicable for fast path are processed as before, skipping
over the 'fast' ones.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/board.rst | 15 ++++++
Documentation/driver-api/gpio/consumer.rst | 8 +++
drivers/gpio/gpiolib.c | 87 ++++++++++++++++++++++++++++--
3 files changed, 105 insertions(+), 5 deletions(-)
diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
index 2c112553df84..c66821e033c2 100644
--- a/Documentation/driver-api/gpio/board.rst
+++ b/Documentation/driver-api/gpio/board.rst
@@ -193,3 +193,18 @@ And the table can be added to the board code as follows::
The line will be hogged as soon as the gpiochip is created or - in case the
chip was created earlier - when the hog table is registered.
+
+Arrays of pins
+--------------
+In addition to requesting pins belonging to a function one by one, a device may
+also request an array of pins assigned to the function. The way those pins are
+mapped to the device determines if the array qualifies for fast bitmap
+processing. If yes, a bitmap is passed over get/set array functions directly
+between a caller and a respective .get/set_multiple() callback of a GPIO chip.
+
+In order to qualify for fast bitmap processing, the pin mapping must meet the
+following requirements:
+- it must belong to the same chip as other 'fast' pins of the function,
+- its index within the function must match its hardware number within the chip.
+
+Open drain and open source pins are excluded from fast bitmap output processing.
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 0afd95a12b10..cf992e5ab976 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -388,6 +388,14 @@ array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
+Still better performance may be achieved if array indexes of the descriptors
+match hardware pin numbers of a single chip. If an array passed to a get/set
+array function matches the one obtained from gpiod_get_array() and array_info
+associated with the array is also passed, the function may take a fast bitmap
+processing path, passing the value_bitmap argument directly to the respective
+.get/set_multiple() callback of the chip. That allows for utilization of GPIO
+banks as data I/O ports without much loss of performance.
+
The return value of gpiod_get_array_value() and its variants is 0 on success
or negative on error. Note the difference to gpiod_get_value(), which returns
0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4d26cdbdb7cf..b799a89c4c17 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2787,7 +2787,36 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
- int i = 0;
+ int err, i = 0;
+
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ err = gpio_chip_get_multiple(array_info->chip,
+ array_info->get_mask,
+ value_bitmap);
+ if (err)
+ return err;
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ if (bitmap_full(array_info->get_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->get_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
@@ -2818,7 +2847,12 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
__set_bit(hwgpio, mask);
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
@@ -2829,7 +2863,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
return ret;
}
- for (j = first; j < i; j++) {
+ for (j = first; j < i; ) {
const struct gpio_desc *desc = desc_array[j];
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(hwgpio, bits);
@@ -2838,6 +2872,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
value = !value;
__assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask, i, j);
+ else
+ j++;
}
if (mask != fastpath)
@@ -3039,6 +3078,32 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
{
int i = 0;
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
+ value_bitmap);
+
+ if (bitmap_full(array_info->set_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->set_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
+
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
@@ -3066,7 +3131,14 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(i, value_bitmap);
- if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+ /*
+ * Pins applicable for fast input but not for
+ * fast output processing may have been already
+ * inverted inside the fast path, skip them.
+ */
+ if (!raw && !(array_info &&
+ test_bit(i, array_info->invert_mask)) &&
+ test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
trace_gpio_value(desc_to_gpio(desc), 0, value);
/*
@@ -3085,7 +3157,12 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
__clear_bit(hwgpio, bits);
count++;
}
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->set_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-08-30 4:30 ` Peter Rosin
2018-08-30 7:40 ` Geert Uytterhoeven
` (2 subsequent siblings)
3 siblings, 0 replies; 75+ messages in thread
From: Peter Rosin @ 2018-08-30 4:30 UTC (permalink / raw)
To: Janusz Krzysztofik, Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby,
Willy Tarreau, Geert Uytterhoeven, linux-doc, linux-i2
On 2018-08-29 22:48, Janusz Krzysztofik wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while processing array of results obtained
> from, or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
> diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
> index 401308e3d036..4e36e0eac7a3 100644
> --- a/drivers/i2c/muxes/i2c-mux-gpio.c
> +++ b/drivers/i2c/muxes/i2c-mux-gpio.c
> @@ -22,18 +22,16 @@ struct gpiomux {
> struct i2c_mux_gpio_platform_data data;
> unsigned gpio_base;
> struct gpio_desc **gpios;
> - int *values;
> + int *values; /* FIXME: no longer needed */
That's a half-measure...
> };
>
> static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
> {
> + unsigned long value_bitmap[1] = { val, };
> int i;
...and i is no longer needed. Hmm, I'd expect a warning about that?
>
> - for (i = 0; i < mux->data.n_gpios; i++)
> - mux->values[i] = (val >> i) & 1;
> -
> gpiod_set_array_value_cansleep(mux->data.n_gpios,
> - mux->gpios, mux->values);
> + mux->gpios, value_bitmap);
> }
>
> static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
> diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
> index 6fdd9316db8b..734e1b43aed6 100644
> --- a/drivers/mux/gpio.c
> +++ b/drivers/mux/gpio.c
> @@ -17,20 +17,17 @@
>
> struct mux_gpio {
> struct gpio_descs *gpios;
> - int *val;
> + int *val; /* FIXME: no longer needed */
> };
>
> static int mux_gpio_set(struct mux_control *mux, int state)
> {
> struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
> + unsigned long value_bitmap[1] = { state, };
> int i;
>
> - for (i = 0; i < mux_gpio->gpios->ndescs; i++)
> - mux_gpio->val[i] = (state >> i) & 1;
> -
> gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
> - mux_gpio->gpios->desc,
> - mux_gpio->val);
> + mux_gpio->gpios->desc, value_bitmap);
>
> return 0;
> }
Dito for this driver. Just squash the following and be done with
it, no attribution needed...
With that (for the changes in i2c-mux-gpio.c and mux/gpio.c)
Reviewed-by: Peter Rosin <peda@axentia.se>
Linus, I expect this will will end up in some immutable branch for me
to pick up, in case I need to? Not that I expect further work to clash
in these two drivers, but...
Cheers,
Peter
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 4e36e0eac7a3..06a89a29250a 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -22,13 +22,11 @@ struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
struct gpio_desc **gpios;
- int *values; /* FIXME: no longer needed */
};
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
unsigned long value_bitmap[1] = { val, };
- int i;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
mux->gpios, value_bitmap);
@@ -180,15 +178,13 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
- mux->data.n_gpios * sizeof(*mux->gpios) +
- mux->data.n_gpios * sizeof(*mux->values), 0,
+ mux->data.n_gpios * sizeof(*mux->gpios), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
goto alloc_failed;
}
mux->gpios = muxc->priv;
- mux->values = (int *)(mux->gpios + mux->data.n_gpios);
muxc->priv = mux;
platform_set_drvdata(pdev, muxc);
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 734e1b43aed6..eb1798677dfd 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -17,14 +17,12 @@
struct mux_gpio {
struct gpio_descs *gpios;
- int *val; /* FIXME: no longer needed */
};
static int mux_gpio_set(struct mux_control *mux, int state)
{
struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
unsigned long value_bitmap[1] = { state, };
- int i;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
mux_gpio->gpios->desc, value_bitmap);
@@ -55,13 +53,11 @@ static int mux_gpio_probe(struct platform_device *pdev)
if (pins < 0)
return pins;
- mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio) +
- pins * sizeof(*mux_gpio->val));
+ mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio));
if (IS_ERR(mux_chip))
return PTR_ERR(mux_chip);
mux_gpio = mux_chip_priv(mux_chip);
- mux_gpio->val = (int *)(mux_gpio + 1);
mux_chip->ops = &mux_gpio_ops;
mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-30 4:30 ` Peter Rosin
@ 2018-08-30 7:40 ` Geert Uytterhoeven
2018-08-30 11:10 ` Miguel Ojeda
2018-08-31 9:14 ` Linus Walleij
3 siblings, 0 replies; 75+ messages in thread
From: Geert Uytterhoeven @ 2018-08-30 7:40 UTC (permalink / raw)
To: jmkrzyszt
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
peter.korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski, Greg KH,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald, Jiri Slaby,
Willy Tarreau, open list:DOCUMENTATION
Hi Janusz,
On Wed, Aug 29, 2018 at 10:48 PM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while processing array of results obtained
> from, or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
> Cc: Peter Korsgaard <peter.korsgaard@barco.com>
> Cc: Peter Rosin <peda@axentia.se>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Dominik Brodowski <linux@dominikbrodowski.net>
> Cc: Kishon Vijay Abraham I <kishon@ti.com>
> Cc: Lars-Peter Clausen <lars@metafoo.de>
> Cc: Michael Hennerich <Michael.Hennerich@analog.com>
> Cc: Jonathan Cameron <jic23@kernel.org>
> Cc: Hartmut Knaack <knaack.h@gmx.de>
> Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Jiri Slaby <jslaby@suse.com>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Thanks for your patch!
> --- a/drivers/auxdisplay/hd44780.c
> +++ b/drivers/auxdisplay/hd44780.c
> @@ -62,20 +62,19 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> /* write to an LCD panel register in 8 bit GPIO mode */
> static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW */
> - unsigned int i, n;
> + unsigned long value_bitmap[1]; /* for DATA[0-7], RS, RW */
> + unsigned int n;
>
> - for (i = 0; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> + value_bitmap[0] = val;
> + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> n = 9;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
The clearing is not needed, as this has been done by 'value_bitmap[0] = val;'
> n++;
> }
So the above block can be simplified to:
n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
>
> hd44780_strobe_gpio(hd);
> }
> @@ -83,32 +82,31 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> /* write to an LCD panel register in 4 bit GPIO mode */
> static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> - unsigned int i, n;
> + /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
This comment is not correct, as the low bits will be used.
/* DATA[4-7], RS, RW */
> + unsigned long value_bitmap[1];
> + unsigned int n;
>
> /* High nibble + RS, RW */
> - for (i = 4; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> + value_bitmap[0] = val;
> + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> n = 5;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
Not needed.
> n++;
> }
Hence:
n = hd->pins[PIN_CTRL_RW] ? 6: 5;
> + value_bitmap[0] >>= PIN_DATA4;
Yuck?!?
Isn't it more readable to just do:
/* High nibble + RS, RW */
value_bitmap[0] = val >> 4;
__assign_bit(4, value_bitmap, rs);
n = hd->pins[PIN_CTRL_RW] ? 6: 5;
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> - &values[PIN_DATA4]);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
>
> hd44780_strobe_gpio(hd);
>
> /* Low nibble */
> - for (i = 0; i < 4; i++)
> - values[PIN_DATA4 + i] = !!(val & BIT(i));
> + value_bitmap[0] &= ~((1 << PIN_DATA4) - 1);
> + value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
... and:
/* Low nibble */
value_bitmap[0] &= ~0x0f;
value_bitmap[0] |= val & 0x0f;
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> - &values[PIN_DATA4]);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
>
> hd44780_strobe_gpio(hd);
> }
> @@ -155,23 +153,23 @@ static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)
> /* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
> static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
> {
> - int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> + /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
This comment is not correct, as the low bits will be used.
/* DATA[4-7], RS, RW */
> + unsigned long value_bitmap[1];
> struct hd44780 *hd = lcd->drvdata;
> - unsigned int i, n;
> + unsigned int n;
>
> /* Command nibble + RS, RW */
> - for (i = 0; i < 4; i++)
> - values[PIN_DATA4 + i] = !!(cmd & BIT(i));
> - values[PIN_CTRL_RS] = 0;
> + value_bitmap[0] = cmd << PIN_DATA4;
> + __clear_bit(PIN_CTRL_RS, value_bitmap);
Implied by the assignment above.
> n = 5;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
> n++;
> }
> + value_bitmap[0] = value_bitmap[0] >> PIN_DATA4;
Hence:
/* Command nibble + RS, RW */
value_bitmap[0] = cmd;
n = hd->pins[PIN_CTRL_RW] ? 6: 5;
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> - &values[PIN_DATA4]);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
>
> hd44780_strobe_gpio(hd);
> }
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-30 4:30 ` Peter Rosin
2018-08-30 7:40 ` Geert Uytterhoeven
@ 2018-08-30 11:10 ` Miguel Ojeda
2018-08-30 15:35 ` David Laight
2018-09-02 10:19 ` Janusz Krzysztofik
2018-08-31 9:14 ` Linus Walleij
3 siblings, 2 replies; 75+ messages in thread
From: Miguel Ojeda @ 2018-08-30 11:10 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Peter Korsgaard, Peter Rosin,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby,
Willy Tarreau, Geert Uytterhoeven, Linux
Hi Janusz,
On Wed, Aug 29, 2018 at 10:48 PM, Janusz Krzysztofik
<jmkrzyszt@gmail.com> wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while processing array of results obtained
> from, or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
> Cc: Peter Korsgaard <peter.korsgaard@barco.com>
> Cc: Peter Rosin <peda@axentia.se>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Dominik Brodowski <linux@dominikbrodowski.net>
> Cc: Kishon Vijay Abraham I <kishon@ti.com>
> Cc: Lars-Peter Clausen <lars@metafoo.de>
> Cc: Michael Hennerich <Michael.Hennerich@analog.com>
> Cc: Jonathan Cameron <jic23@kernel.org>
> Cc: Hartmut Knaack <knaack.h@gmx.de>
> Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Jiri Slaby <jslaby@suse.com>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
> Documentation/driver-api/gpio/consumer.rst | 22 ++++----
> drivers/auxdisplay/hd44780.c | 52 +++++++++--------
> drivers/bus/ts-nbus.c | 19 ++-----
> drivers/gpio/gpio-max3191x.c | 17 +++---
> drivers/gpio/gpiolib.c | 86 +++++++++++++++--------------
> drivers/gpio/gpiolib.h | 4 +-
> drivers/i2c/muxes/i2c-mux-gpio.c | 8 +--
> drivers/mmc/core/pwrseq_simple.c | 13 ++---
> drivers/mux/gpio.c | 9 +--
> drivers/net/phy/mdio-mux-gpio.c | 3 +-
> drivers/pcmcia/soc_common.c | 11 ++--
> drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 +++---
> drivers/staging/iio/adc/ad7606.c | 9 +--
> drivers/tty/serial/serial_mctrl_gpio.c | 7 ++-
> include/linux/gpio/consumer.h | 18 +++---
> 15 files changed, 140 insertions(+), 155 deletions(-)
>
> diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
> index aa03f389d41d..ed68042ddccf 100644
> --- a/Documentation/driver-api/gpio/consumer.rst
> +++ b/Documentation/driver-api/gpio/consumer.rst
> @@ -323,29 +323,29 @@ The following functions get or set the values of an array of GPIOs::
>
> int gpiod_get_array_value(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array);
> + unsigned long *value_bitmap);
> int gpiod_get_raw_array_value(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array);
> + unsigned long *value_bitmap);
> int gpiod_get_array_value_cansleep(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array);
> + unsigned long *value_bitmap);
> int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array);
> + unsigned long *value_bitmap);
>
> void gpiod_set_array_value(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array)
> + unsigned long *value_bitmap)
> void gpiod_set_raw_array_value(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array)
> + unsigned long *value_bitmap)
> void gpiod_set_array_value_cansleep(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array)
> + unsigned long *value_bitmap)
> void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
> struct gpio_desc **desc_array,
> - int *value_array)
> + unsigned long *value_bitmap)
>
> The array can be an arbitrary set of GPIOs. The functions will try to access
> GPIOs belonging to the same bank or chip simultaneously if supported by the
> @@ -356,8 +356,8 @@ accessed sequentially.
> The functions take three arguments:
> * array_size - the number of array elements
> * desc_array - an array of GPIO descriptors
> - * value_array - an array to store the GPIOs' values (get) or
> - an array of values to assign to the GPIOs (set)
> + * value_bitmap - a bitmap to store the GPIOs' values (get) or
> + a bitmap of values to assign to the GPIOs (set)
>
> The descriptor array can be obtained using the gpiod_get_array() function
> or one of its variants. If the group of descriptors returned by that function
> @@ -366,7 +366,7 @@ the struct gpio_descs returned by gpiod_get_array()::
>
> struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
> gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
> - my_gpio_values);
> + my_gpio_value_bitmap);
>
> It is also possible to access a completely arbitrary array of descriptors. The
> descriptors may be obtained using any combination of gpiod_get() and
> diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
> index f1a42f0f1ded..bbbd6a29bf01 100644
> --- a/drivers/auxdisplay/hd44780.c
> +++ b/drivers/auxdisplay/hd44780.c
> @@ -62,20 +62,19 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> /* write to an LCD panel register in 8 bit GPIO mode */
> static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW */
> - unsigned int i, n;
> + unsigned long value_bitmap[1]; /* for DATA[0-7], RS, RW */
(I read your comments in the other email)
I still find this odd, but if everyone is going to have this change
done like this, consistency is better.
> + unsigned int n;
>
> - for (i = 0; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> + value_bitmap[0] = val;
> + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> n = 9;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
> n++;
> }
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
>
> hd44780_strobe_gpio(hd);
> }
> @@ -83,32 +82,31 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> /* write to an LCD panel register in 4 bit GPIO mode */
> static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> - unsigned int i, n;
> + /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
> + unsigned long value_bitmap[1];
Ditto.
> + unsigned int n;
>
> /* High nibble + RS, RW */
> - for (i = 4; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> + value_bitmap[0] = val;
> + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> n = 5;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
> n++;
> }
> + value_bitmap[0] >>= PIN_DATA4;
>
> /* Present the data to the port */
> - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> - &values[PIN_DATA4]);
> + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
>
> hd44780_strobe_gpio(hd);
>
> /* Low nibble */
> - for (i = 0; i < 4; i++)
> - values[PIN_DATA4 + i] = !!(val & BIT(i));
> + value_bitmap[0] &= ~((1 << PIN_DATA4) - 1);
> + value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
This is still wrong! What I originally meant in my v4 review is that
there is an extra ~ in the second line.
Also, a couple of general comments:
- Please review the list of CCs (I was not CC'd originally, so maybe
there are other maintainers that aren't, either)
- In general, the new code seems harder to read than the original one
(but that is my impression).
Thanks for your effort! :-)
Cheers,
Miguel
^ permalink raw reply [flat|nested] 75+ messages in thread
* RE: [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-30 11:10 ` Miguel Ojeda
@ 2018-08-30 15:35 ` David Laight
2018-09-02 10:19 ` Janusz Krzysztofik
1 sibling, 0 replies; 75+ messages in thread
From: David Laight @ 2018-08-30 15:35 UTC (permalink / raw)
To: 'Miguel Ojeda', Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Peter Korsgaard, Peter Rosin,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby,
Willy Tarreau, Geert Uytterhoeven, Linux
From: Miguel Ojeda
> Sent: 30 August 2018 12:11
...
> > + unsigned long value_bitmap[1]; /* for DATA[0-7], RS, RW */
>
> (I read your comments in the other email)
>
> I still find this odd, but if everyone is going to have this change
> done like this, consistency is better.
Maybe there ought to be a define so you can do:
DEFINE_BITMAP(value_bitmap, 32);
While it might just generate an unsigned long [] there is probably
scope for stronger typing.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (2 preceding siblings ...)
2018-08-30 11:10 ` Miguel Ojeda
@ 2018-08-31 9:14 ` Linus Walleij
3 siblings, 0 replies; 75+ messages in thread
From: Linus Walleij @ 2018-08-31 9:14 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg KH, kishon,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald, Jiri Slaby, Willy Tarreau,
Geert Uytterhoeven, linux-doc, linux-i2c
On Wed, Aug 29, 2018 at 10:48 PM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
So it's no secret that I strongly fancy this patch set.
What would be great at this point is to have some people test
that the drivers still work as expected, even better if they can do
some benchmarking.
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> + value_bitmap[0] = val;
> + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> n = 9;
> if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> + __clear_bit(PIN_CTRL_RW, value_bitmap);
This seems fine to me, but I understand the comment that the
code becomes harder to read.
I think part of it is those __assign_bit() and __clear_bit() with
the double-underscore of unclear meaning. The meaning is
"non atomic" IIRC, so maybe I should move forward
with my plan to send a sed script to Torvalds just renaming all
of those to something sane in the next merge window.
Like __assign_bit() -> assign_bit_nonatomic()
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATH v6 0/4] gpiolib: speed up GPIO array processing
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
` (3 preceding siblings ...)
2018-08-29 20:49 ` [PATCH v5 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
@ 2018-08-31 22:56 ` Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (4 more replies)
4 siblings, 5 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-31 22:56 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
The goal is to boost performance of get/set array functions while
processing GPIO arrays which represent pins of a signle chip in
hardware order. If resulting performance is close to PIO, GPIO API
can be used for data I/O without much loss of speed.
Created and tested on a low end Amstrad Delta board with NAND driver
updated to use GPIO API for data I/O. Performance degrade compared to
PIO is much better than before the optimization but still not quite
satisfactory.
Janusz Krzysztofik (4):
gpiolib: Pass bitmaps, not integer arrays, to get/set array
gpiolib: Identify arrays matching GPIO hardware
gpiolib: Pass array info to get/set array functions
gpiolib: Implement fast processing path in get/set array
Changelog:
v6:
[PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set
- use DECLARE_BITMAP() macro for declaring value_bitmap - great idea by
David Laight, thanks!
drivers/auxdisplay/hd44780.c:
- simplify the code and adjust comments as recommended by Geert
Uytterhoeven - thanks!,
drivers/i2c/muxes/i2c-mux-gpio.c:
- drop .values member of struct gpiomux - details prvided by Peter
Rosin, thanks!,
drivers/mux/gpio.c:
- drop .val member of struct mux_gpio - details prvided by Peter
Rosin, thanks!,
drivers/net/phy/mdio-mux-gpio.c:
- drop .values member of struct mdio_mux_gpio_state and is processsing.
v5:
[PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set
- drivers/i2c/muxes/i2c-mux-gpio.c:
- drop assigment of values to struct gpiomux.values, as recommended
by Peter Rosin - thanks!,
- mark the .values member of the structure as obsolete,
- drivers/mux/gpio.c:
- drop assigment of values to struct mux_gpio.val, also recommended
by Peter Rosin - thanks!,
- merk the .val member of the structure as obsolete,
- drivers/auxdisplay/hd44780.c:
- fix incorrect bitmap size,
- use >>= operator to simplify notation,
both catched by Miguel Ojeda - thanks!,
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware
- add Cc: clause.
[PATCH v5 3/4] gpiolib: Pass array info to get/set array functions
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 4/4] gpiolib: Implement fast processing path in get/set
- add Cc: clause.
v4:
That series was a follow up of the former "mtd: rawnand: ams-delta: Use
gpio-omap accessors for data I/O" which already contained some changes
to gpiolib. Those previous attempts were commented by Borris Brezillon
who suggested using GPIO API modified to accept bitmaps, and by Linus
Walleij who suggested still more great ideas for further immprovement
of the proposed API changes - thanks!
diffstat:
Documentation/driver-api/gpio/board.rst | 15 +
Documentation/driver-api/gpio/consumer.rst | 48 +++-
drivers/auxdisplay/hd44780.c | 74 +++----
drivers/bus/ts-nbus.c | 27 +-
drivers/gpio/gpio-max3191x.c | 23 +-
drivers/gpio/gpiolib.c | 279 ++++++++++++++++++++++------
drivers/gpio/gpiolib.h | 15 +
drivers/i2c/muxes/i2c-mux-gpio.c | 16 -
drivers/mmc/core/pwrseq_simple.c | 15 -
drivers/mux/gpio.c | 18 -
drivers/net/phy/mdio-mux-gpio.c | 13 -
drivers/pcmcia/soc_common.c | 14 -
drivers/phy/motorola/phy-mapphone-mdm6600.c | 21 +-
drivers/staging/iio/adc/ad7606.c | 12 -
drivers/tty/serial/serial_mctrl_gpio.c | 9
include/linux/gpio/consumer.h | 35 ++-
16 files changed, 417 insertions(+), 217 deletions(-)
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
@ 2018-08-31 22:56 ` Janusz Krzysztofik
2018-09-01 0:23 ` Peter Rosin
` (2 more replies)
2018-08-31 22:56 ` [PATCH v6 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
` (3 subsequent siblings)
4 siblings, 3 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-31 22:56 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Most users of get/set array functions iterate consecutive bits of data,
usually a single integer, while processing array of results obtained
from, or building an array of values to be passed to those functions.
Save time wasted on those iterations by changing the functions' API to
accept bitmaps.
All current users are updated as well.
More benefits from the change are expected as soon as planned support
for accepting/passing those bitmaps directly from/to respective GPIO
chip callbacks if applicable is implemented.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
---
Documentation/driver-api/gpio/consumer.rst | 22 ++++----
drivers/auxdisplay/hd44780.c | 62 ++++++++-------------
drivers/bus/ts-nbus.c | 21 ++-----
drivers/gpio/gpio-max3191x.c | 17 +++---
drivers/gpio/gpiolib.c | 86 +++++++++++++++--------------
drivers/gpio/gpiolib.h | 4 +-
drivers/i2c/muxes/i2c-mux-gpio.c | 14 ++---
drivers/mmc/core/pwrseq_simple.c | 13 ++---
drivers/mux/gpio.c | 15 ++---
drivers/net/phy/mdio-mux-gpio.c | 11 ++--
drivers/pcmcia/soc_common.c | 11 ++--
drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 +++---
drivers/staging/iio/adc/ad7606.c | 9 +--
drivers/tty/serial/serial_mctrl_gpio.c | 7 ++-
include/linux/gpio/consumer.h | 18 +++---
15 files changed, 145 insertions(+), 182 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index aa03f389d41d..ed68042ddccf 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -323,29 +323,29 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
GPIOs belonging to the same bank or chip simultaneously if supported by the
@@ -356,8 +356,8 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
- * value_array - an array to store the GPIOs' values (get) or
- an array of values to assign to the GPIOs (set)
+ * value_bitmap - a bitmap to store the GPIOs' values (get) or
+ a bitmap of values to assign to the GPIOs (set)
The descriptor array can be obtained using the gpiod_get_array() function
or one of its variants. If the group of descriptors returned by that function
@@ -366,7 +366,7 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_values);
+ my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index f1a42f0f1ded..7ee4f9a65bfc 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -62,20 +62,15 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
/* write to an LCD panel register in 8 bit GPIO mode */
static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW */
- unsigned int i, n;
-
- for (i = 0; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
- n = 9;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ DECLARE_BITMAP(value_bitmap, 10); /* for DATA[0-7], RS, RW */
+ unsigned int n;
+
+ *value_bitmap = val;
+ __assign_bit(8, value_bitmap, rs);
+ n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -83,32 +78,25 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
/* write to an LCD panel register in 4 bit GPIO mode */
static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
- unsigned int i, n;
+ DECLARE_BITMAP(value_bitmap, 6); /* for DATA[4-7], RS, RW */
+ unsigned int n;
/* High nibble + RS, RW */
- for (i = 4; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
- n = 5;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ *value_bitmap = val >> 4;
+ __assign_bit(4, value_bitmap, rs);
+ n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
/* Low nibble */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(val & BIT(i));
+ *value_bitmap &= ~0x0f;
+ *value_bitmap |= val & 0x0f;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -155,23 +143,17 @@ static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)
/* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ DECLARE_BITMAP(value_bitmap, 6);
struct hd44780 *hd = lcd->drvdata;
- unsigned int i, n;
+ unsigned int n;
/* Command nibble + RS, RW */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(cmd & BIT(i));
- values[PIN_CTRL_RS] = 0;
- n = 5;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ *value_bitmap = cmd & 0x0f;
+ n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 073fd9011154..2ac5239df865 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -110,13 +110,11 @@ static void ts_nbus_set_direction(struct ts_nbus *ts_nbus, int direction)
*/
static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
- int i;
- int values[8];
-
- for (i = 0; i < 8; i++)
- values[i] = 0;
+ DECLARE_BITMAP(value_bitmap, 8);
+
+ *value_bitmap = 0;
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, value_bitmap);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -157,16 +155,9 @@ static int ts_nbus_read_byte(struct ts_nbus *ts_nbus, u8 *val)
static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
{
struct gpio_descs *gpios = ts_nbus->data;
- int i;
- int values[8];
-
- for (i = 0; i < 8; i++)
- if (byte & BIT(i))
- values[i] = 1;
- else
- values[i] = 0;
+ DECLARE_BITMAP(value_bitmap, 8) = { byte, };
- gpiod_set_array_value_cansleep(8, gpios->desc, values);
+ gpiod_set_array_value_cansleep(8, gpios->desc, value_bitmap);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index b5b9cb1fda50..c4ec1c82af27 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -315,17 +315,20 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
int value)
{
- int i, *values;
+ unsigned long *value_bitmap;
- values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
- if (!values)
+ value_bitmap = kmalloc_array(BITS_TO_LONGS(ndescs),
+ sizeof(*value_bitmap), GFP_KERNEL);
+ if (!value_bitmap)
return;
- for (i = 0; i < ndescs; i++)
- values[i] = value;
+ if (value)
+ bitmap_fill(value_bitmap, ndescs);
+ else
+ bitmap_zero(value_bitmap, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(ndescs, desc, value_bitmap);
+ kfree(value_bitmap);
}
static struct gpio_descs *devm_gpiod_get_array_optional_count(
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8f8a1999393..f0e9ffa8cab6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -427,7 +427,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
struct linehandle_state *lh = filep->private_data;
void __user *ip = (void __user *)arg;
struct gpiohandle_data ghd;
- int vals[GPIOHANDLES_MAX];
+ unsigned long value_bitmap[BITS_TO_LONGS(GPIOHANDLES_MAX)];
int i;
if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
@@ -436,13 +436,13 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
- vals);
+ value_bitmap);
if (ret)
return ret;
memset(&ghd, 0, sizeof(ghd));
for (i = 0; i < lh->numdescs; i++)
- ghd.values[i] = vals[i];
+ ghd.values[i] = test_bit(i, value_bitmap);
if (copy_to_user(ip, &ghd, sizeof(ghd)))
return -EFAULT;
@@ -461,14 +461,14 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
/* Clamp all values to [0,1] */
for (i = 0; i < lh->numdescs; i++)
- vals[i] = !!ghd.values[i];
+ __assign_bit(i, value_bitmap, !!ghd.values[i]);
/* Reuse the array setting function */
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
lh->descs,
- vals);
+ value_bitmap);
}
return -EINVAL;
}
@@ -2784,7 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -2835,7 +2835,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
- value_array[j] = value;
+ __assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
}
@@ -2895,9 +2895,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
/**
* gpiod_get_raw_array_value() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -2907,20 +2907,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
/**
* gpiod_get_array_value() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitnap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -2929,12 +2930,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3027,7 +3029,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -3056,7 +3058,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
do {
struct gpio_desc *desc = desc_array[i];
int hwgpio = gpio_chip_hwgpio(desc);
- int value = value_array[i];
+ int value = test_bit(i, value_bitmap);
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
@@ -3152,9 +3154,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
/**
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3163,20 +3165,21 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
* complain if the GPIO chip functions potentially sleep.
*/
int gpiod_set_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
/**
* gpiod_set_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3185,12 +3188,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
* complain if the GPIO chip functions potentially sleep.
*/
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3410,9 +3414,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
/**
* gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -3422,21 +3426,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
/**
* gpiod_get_array_value_cansleep() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -3445,13 +3449,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3493,9 +3497,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
/**
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3504,13 +3508,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3533,9 +3537,9 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
/**
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3544,13 +3548,13 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index a7e49fef73d4..11e83d2eef89 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -187,11 +187,11 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 401308e3d036..e28ddc20000d 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -22,18 +22,16 @@ struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
struct gpio_desc **gpios;
- int *values;
};
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
- int i;
-
- for (i = 0; i < mux->data.n_gpios; i++)
- mux->values[i] = (val >> i) & 1;
+ DECLARE_BITMAP(value_bitmap, mux->data.n_gpios);
+
+ *value_bitmap = val;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, mux->values);
+ mux->gpios, value_bitmap);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@@ -182,15 +180,13 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
- mux->data.n_gpios * sizeof(*mux->gpios) +
- mux->data.n_gpios * sizeof(*mux->values), 0,
+ mux->data.n_gpios * sizeof(*mux->gpios), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
goto alloc_failed;
}
mux->gpios = muxc->priv;
- mux->values = (int *)(mux->gpios + mux->data.n_gpios);
muxc->priv = mux;
platform_set_drvdata(pdev, muxc);
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index a8b9fee4d62a..fd7791e072b3 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -40,18 +40,13 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
if (!IS_ERR(reset_gpios)) {
- int i, *values;
int nvalues = reset_gpios->ndescs;
+ DECLARE_BITMAP(value_bitmap, nvalues);
- values = kmalloc_array(nvalues, sizeof(int), GFP_KERNEL);
- if (!values)
- return;
+ *value_bitmap = value;
- for (i = 0; i < nvalues; i++)
- values[i] = value;
-
- gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
+ value_bitmap);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 6fdd9316db8b..17b7b1c21d90 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -17,20 +17,17 @@
struct mux_gpio {
struct gpio_descs *gpios;
- int *val;
};
static int mux_gpio_set(struct mux_control *mux, int state)
{
struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
- int i;
-
- for (i = 0; i < mux_gpio->gpios->ndescs; i++)
- mux_gpio->val[i] = (state >> i) & 1;
+ DECLARE_BITMAP(value_bitmap, mux_gpio->gpios->ndescs);
+
+ *value_bitmap = state;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc,
- mux_gpio->val);
+ mux_gpio->gpios->desc, value_bitmap);
return 0;
}
@@ -58,13 +55,11 @@ static int mux_gpio_probe(struct platform_device *pdev)
if (pins < 0)
return pins;
- mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio) +
- pins * sizeof(*mux_gpio->val));
+ mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio));
if (IS_ERR(mux_chip))
return PTR_ERR(mux_chip);
mux_gpio = mux_chip_priv(mux_chip);
- mux_gpio->val = (int *)(mux_gpio + 1);
mux_chip->ops = &mux_gpio_ops;
mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index bc90764a8b8d..3907e9528949 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -20,23 +20,21 @@
struct mdio_mux_gpio_state {
struct gpio_descs *gpios;
void *mux_handle;
- int values[];
};
static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
void *data)
{
struct mdio_mux_gpio_state *s = data;
- unsigned int n;
+ DECLARE_BITMAP(value_bitmap, s->gpios->ndescs);
if (current_child == desired_child)
return 0;
- for (n = 0; n < s->gpios->ndescs; n++)
- s->values[n] = (desired_child >> n) & 1;
+ *value_bitmap = desired_child;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- s->values);
+ value_bitmap);
return 0;
}
@@ -51,8 +49,7 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
if (IS_ERR(gpios))
return PTR_ERR(gpios);
- s = devm_kzalloc(&pdev->dev, struct_size(s, values, gpios->ndescs),
- GFP_KERNEL);
+ s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
if (!s) {
gpiod_put_array(gpios);
return -ENOMEM;
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index c5f2344c189b..44288b1a57ee 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -351,19 +351,22 @@ static int soc_common_pcmcia_config_skt(
if (ret == 0) {
struct gpio_desc *descs[2];
- int values[2], n = 0;
+ DECLARE_BITMAP(value_bitmap, 2);
+ int n = 0;
if (skt->gpio_reset) {
descs[n] = skt->gpio_reset;
- values[n++] = !!(state->flags & SS_RESET);
+ __assign_bit(n++, value_bitmap,
+ !!(state->flags & SS_RESET));
}
if (skt->gpio_bus_enable) {
descs[n] = skt->gpio_bus_enable;
- values[n++] = !!(state->flags & SS_OUTPUT_ENA);
+ __assign_bit(n++, value_bitmap,
+ !!(state->flags & SS_OUTPUT_ENA));
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, values);
+ gpiod_set_array_value_cansleep(n, descs, value_bitmap);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 0075fb0bef8c..b348272f7f1a 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -157,15 +157,12 @@ static const struct phy_ops gpio_usb_ops = {
*/
static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
{
- int values[PHY_MDM6600_NR_CMD_LINES];
- int i;
+ DECLARE_BITMAP(value_bitmap, PHY_MDM6600_NR_CMD_LINES);
- val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
- for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
- values[i] = (val & BIT(i)) >> i;
+ *value_bitmap = val & ((1 << PHY_MDM6600_NR_CMD_LINES) - 1);
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, values);
+ ddata->cmd_gpios->desc, value_bitmap);
}
/**
@@ -176,7 +173,7 @@ static void phy_mdm6600_status(struct work_struct *work)
{
struct phy_mdm6600 *ddata;
struct device *dev;
- int values[PHY_MDM6600_NR_STATUS_LINES];
+ DECLARE_BITMAP(value_bitmap, PHY_MDM6600_NR_STATUS_LINES);
int error, i, val = 0;
ddata = container_of(work, struct phy_mdm6600, status_work.work);
@@ -184,14 +181,14 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
- values);
+ value_bitmap);
if (error)
return;
for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
- val |= values[i] << i;
+ val |= test_bit(i, value_bitmap) << i;
dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
- __func__, i, values[i], val);
+ __func__, i, test_bit(i, value_bitmap), val);
}
ddata->status = val;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 25b9fcd5e3a4..18b6d10b0176 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -202,7 +202,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
- int values[3];
+ DECLARE_BITMAP(value_bitmap, 3);
int ret, i;
switch (mask) {
@@ -227,13 +227,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
- values[0] = (ret >> 0) & 1;
- values[1] = (ret >> 1) & 1;
- values[2] = (ret >> 2) & 1;
+ *value_bitmap = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- values);
+ gpiod_set_array_value(3, st->gpio_os->desc, value_bitmap);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 1c06325beaca..edfe8c688479 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -40,7 +40,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
{
enum mctrl_gpio_idx i;
struct gpio_desc *desc_array[UART_GPIO_MAX];
- int value_array[UART_GPIO_MAX];
+ DECLARE_BITMAP(value_bitmap, UART_GPIO_MAX);
unsigned int count = 0;
if (gpios == NULL)
@@ -49,10 +49,11 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
for (i = 0; i < UART_GPIO_MAX; i++)
if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
desc_array[count] = gpios->gpio[i];
- value_array[count] = !!(mctrl & mctrl_gpios_desc[i].mctrl);
+ __assign_bit(count, value_bitmap,
+ !!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_array);
+ gpiod_set_array_value(count, desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 21ddbe440030..1b21dc7b0fad 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -104,36 +104,38 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v6 2/4] gpiolib: Identify arrays matching GPIO hardware
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-08-31 22:56 ` Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
` (2 subsequent siblings)
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-31 22:56 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Geert Uytterhoeven,
linux-serial, Jiri Slaby, Michael Hennerich, linux-gpio,
Lars-Peter Clausen, Greg Kroah-Hartman, linux-mmc, linux-kernel,
Willy Tarreau, Miguel Ojeda Sandonis
Certain GPIO array lookup results may map directly to GPIO pins of a
single GPIO chip in hardware order. If that condition is recognized
and handled efficiently, significant performance gain of get/set array
functions may be possible.
While processing a request for an array of GPIO descriptors, identify
those which represent corresponding pins of a single GPIO chip. Skip
over pins which require open source or open drain special processing.
Moreover, identify pins which require inversion. Pass a pointer to
that information with the array to the caller so it can benefit from
enhanced performance as soon as get/set array functions can accept and
make efficient use of it.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 4 +-
drivers/gpio/gpiolib.c | 72 +++++++++++++++++++++++++++++-
drivers/gpio/gpiolib.h | 9 ++++
include/linux/gpio/consumer.h | 9 ++++
4 files changed, 92 insertions(+), 2 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index ed68042ddccf..7e0298b9a7b9 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -109,9 +109,11 @@ For a function using multiple GPIOs all of those can be obtained with one call::
enum gpiod_flags flags)
This function returns a struct gpio_descs which contains an array of
-descriptors::
+descriptors. It also contains a pointer to a gpiolib private structure which,
+if passed back to get/set array functions, may speed up I/O proocessing::
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f0e9ffa8cab6..c1ed1c759345 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4174,7 +4174,9 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
{
struct gpio_desc *desc;
struct gpio_descs *descs;
- int count;
+ struct gpio_array *array_info = NULL;
+ struct gpio_chip *chip;
+ int count, bitmap_size;
count = gpiod_count(dev, con_id);
if (count < 0)
@@ -4190,9 +4192,77 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
gpiod_put_array(descs);
return ERR_CAST(desc);
}
+
descs->desc[descs->ndescs] = desc;
+
+ chip = gpiod_to_chip(desc);
+ /*
+ * Select a chip of first array member
+ * whose index matches its pin hardware number
+ * as a candidate for fast bitmap processing.
+ */
+ if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) {
+ struct gpio_descs *array;
+
+ bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
+ chip->ngpio : count);
+
+ array = kzalloc(struct_size(descs, desc, count) +
+ struct_size(array_info, invert_mask,
+ 3 * bitmap_size), GFP_KERNEL);
+ if (!array) {
+ gpiod_put_array(descs);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ memcpy(array, descs,
+ struct_size(descs, desc, descs->ndescs + 1));
+ kfree(descs);
+
+ descs = array;
+ array_info = (void *)(descs->desc + count);
+ array_info->get_mask = array_info->invert_mask +
+ bitmap_size;
+ array_info->set_mask = array_info->get_mask +
+ bitmap_size;
+
+ array_info->desc = descs->desc;
+ array_info->size = count;
+ array_info->chip = chip;
+ bitmap_set(array_info->get_mask, descs->ndescs,
+ count - descs->ndescs);
+ bitmap_set(array_info->set_mask, descs->ndescs,
+ count - descs->ndescs);
+ descs->info = array_info;
+ }
+ /*
+ * Unmark members which don't qualify for fast bitmap
+ * processing (different chip, not in hardware order)
+ */
+ if (array_info && (chip != array_info->chip ||
+ gpio_chip_hwgpio(desc) != descs->ndescs)) {
+ __clear_bit(descs->ndescs, array_info->get_mask);
+ __clear_bit(descs->ndescs, array_info->set_mask);
+ } else if (array_info) {
+ /* Exclude open drain or open source from fast output */
+ if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
+ gpiochip_line_is_open_source(chip, descs->ndescs))
+ __clear_bit(descs->ndescs,
+ array_info->set_mask);
+ /* Identify 'fast' pins which require invertion */
+ if (gpiod_is_active_low(desc))
+ __set_bit(descs->ndescs,
+ array_info->invert_mask);
+ }
+
descs->ndescs++;
}
+ if (array_info)
+ dev_dbg(dev,
+ "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
+ array_info->chip->label, array_info->size,
+ *array_info->get_mask, *array_info->set_mask,
+ *array_info->invert_mask);
return descs;
}
EXPORT_SYMBOL_GPL(gpiod_get_array);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 11e83d2eef89..b60905d558b1 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -183,6 +183,15 @@ static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
}
#endif
+struct gpio_array {
+ struct gpio_desc **desc;
+ unsigned int size;
+ struct gpio_chip *chip;
+ unsigned long *get_mask;
+ unsigned long *set_mask;
+ unsigned long invert_mask[];
+};
+
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 1b21dc7b0fad..8dede3e886af 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -17,11 +17,20 @@ struct device;
*/
struct gpio_desc;
+/**
+ * Opaque descriptor for a structure of GPIO array attributes. This structure
+ * is attached to struct gpiod_descs obtained from gpiod_get_array() and can be
+ * passed back to get/set array functions in order to activate fast processing
+ * path if applicable.
+ */
+struct gpio_array;
+
/**
* Struct containing an array of descriptors that can be obtained using
* gpiod_get_array().
*/
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
};
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v6 3/4] gpiolib: Pass array info to get/set array functions
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
@ 2018-08-31 22:56 ` Janusz Krzysztofik
2018-09-04 15:27 ` kbuild test robot
2018-08-31 22:56 ` [PATCH v6 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
4 siblings, 1 reply; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-31 22:56 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
In order to make use of array info obtained from gpiod_get_array() and
speed up processing of arrays matching single GPIO chip layout, that
information must be passed to get/set array functions. Extend the
functions' API with that additional parameter and update all users.
Pass NULL if a user bulids an array itself from single GPIOs.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
---
Documentation/driver-api/gpio/consumer.rst | 14 ++++++++++--
drivers/auxdisplay/hd44780.c | 12 ++++++----
drivers/bus/ts-nbus.c | 6 +++--
drivers/gpio/gpio-max3191x.c | 6 +++--
drivers/gpio/gpiolib.c | 34 ++++++++++++++++++++---------
drivers/gpio/gpiolib.h | 2 ++
drivers/i2c/muxes/i2c-mux-gpio.c | 2 +-
drivers/mmc/core/pwrseq_simple.c | 2 +-
drivers/mux/gpio.c | 3 ++-
drivers/net/phy/mdio-mux-gpio.c | 2 +-
drivers/pcmcia/soc_common.c | 3 ++-
drivers/phy/motorola/phy-mapphone-mdm6600.c | 4 +++-
drivers/staging/iio/adc/ad7606.c | 3 ++-
drivers/tty/serial/serial_mctrl_gpio.c | 2 +-
include/linux/gpio/consumer.h | 8 +++++++
15 files changed, 75 insertions(+), 28 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 7e0298b9a7b9..0afd95a12b10 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -325,28 +325,36 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
@@ -358,6 +366,7 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
+ * array_info - optional information obtained from gpiod_array_get()
* value_bitmap - a bitmap to store the GPIOs' values (get) or
a bitmap of values to assign to the GPIOs (set)
@@ -368,12 +377,13 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_value_bitmap);
+ my_gpio_descs->info, my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
gpiod_get_array(). Afterwards the array of descriptors has to be setup
-manually before it can be passed to one of the above functions.
+manually before it can be passed to one of the above functions. In that case,
+array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index 7ee4f9a65bfc..4134fd090206 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -70,7 +70,8 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -87,7 +88,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
@@ -96,7 +98,8 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
*value_bitmap |= val & 0x0f;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
@@ -153,7 +156,8 @@ static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], value_bitmap);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL,
+ value_bitmap);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 2ac5239df865..0a8fa64a4050 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -114,7 +114,8 @@ static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
*value_bitmap = 0;
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc,
+ ts_nbus->data->info, value_bitmap);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -157,7 +158,8 @@ static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
struct gpio_descs *gpios = ts_nbus->data;
DECLARE_BITMAP(value_bitmap, 8) = { byte, };
- gpiod_set_array_value_cansleep(8, gpios->desc, value_bitmap);
+ gpiod_set_array_value_cansleep(8, gpios->desc, gpios->info,
+ value_bitmap);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index c4ec1c82af27..4b43b5dabfd2 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -313,6 +313,7 @@ static int max3191x_set_config(struct gpio_chip *gpio, unsigned int offset,
static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
+ struct gpio_array *info,
int value)
{
unsigned long *value_bitmap;
@@ -327,7 +328,7 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
else
bitmap_zero(value_bitmap, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, value_bitmap);
+ gpiod_set_array_value_cansleep(ndescs, desc, info, value_bitmap);
kfree(value_bitmap);
}
@@ -400,7 +401,8 @@ static int max3191x_probe(struct spi_device *spi)
if (max3191x->modesel_pins)
gpiod_set_array_single_value_cansleep(
max3191x->modesel_pins->ndescs,
- max3191x->modesel_pins->desc, max3191x->mode);
+ max3191x->modesel_pins->desc,
+ max3191x->modesel_pins->info, max3191x->mode);
max3191x->ignore_uv = device_property_read_bool(dev,
"maxim,ignore-undervoltage");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c1ed1c759345..4d26cdbdb7cf 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -435,7 +435,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
int ret = gpiod_get_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
if (ret)
return ret;
@@ -467,7 +467,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
return gpiod_set_array_value_complex(false,
true,
lh->numdescs,
- lh->descs,
+ lh->descs, NULL,
value_bitmap);
}
return -EINVAL;
@@ -2784,6 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -2908,12 +2909,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
*/
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
@@ -2931,12 +2934,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
*/
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3029,6 +3034,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -3166,12 +3172,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
*/
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
@@ -3189,12 +3196,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
*/
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3426,13 +3434,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
@@ -3449,13 +3459,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3508,13 +3520,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3548,13 +3561,14 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index b60905d558b1..b65ca896b24d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -196,10 +196,12 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index e28ddc20000d..ac77519d4a82 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -31,7 +31,7 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
*value_bitmap = val;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, value_bitmap);
+ mux->gpios, NULL, value_bitmap);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index fd7791e072b3..a57f8a7d5266 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -46,7 +46,7 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
*value_bitmap = value;
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
- value_bitmap);
+ reset_gpios->info, value_bitmap);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 17b7b1c21d90..728323207b8c 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -27,7 +27,8 @@ static int mux_gpio_set(struct mux_control *mux, int state)
*value_bitmap = state;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc, value_bitmap);
+ mux_gpio->gpios->desc,
+ mux_gpio->gpios->info, value_bitmap);
return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index 3907e9528949..42f5c253b62c 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -34,7 +34,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
*value_bitmap = desired_child;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- value_bitmap);
+ s->gpios->info, value_bitmap);
return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index 44288b1a57ee..75c3e0bb2737 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -366,7 +366,8 @@ static int soc_common_pcmcia_config_skt(
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, value_bitmap);
+ gpiod_set_array_value_cansleep(n, descs, NULL,
+ value_bitmap);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index b348272f7f1a..5611a04bc286 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -162,7 +162,8 @@ static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
*value_bitmap = val & ((1 << PHY_MDM6600_NR_CMD_LINES) - 1);
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, value_bitmap);
+ ddata->cmd_gpios->desc,
+ ddata->cmd_gpios->info, value_bitmap);
}
/**
@@ -181,6 +182,7 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
+ ddata->status_gpios->info,
value_bitmap);
if (error)
return;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 18b6d10b0176..9115b5ee3601 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -230,7 +230,8 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
*value_bitmap = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(3, st->gpio_os->desc, value_bitmap);
+ gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
+ value_bitmap);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index edfe8c688479..66408108a951 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -53,7 +53,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
!!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_bitmap);
+ gpiod_set_array_value(count, desc_array, NULL, value_bitmap);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 8dede3e886af..bf037ebe2ed8 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -114,36 +114,44 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v6 4/4] gpiolib: Implement fast processing path in get/set array
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (2 preceding siblings ...)
2018-08-31 22:56 ` [PATCH v6 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
@ 2018-08-31 22:56 ` Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-08-31 22:56 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Certain GPIO descriptor arrays returned by gpio_get_array() may contain
information on direct mapping of array members to pins of a single GPIO
chip in hardware order. In such cases, bitmaps of values can be passed
directly from/to the chip's .get/set_multiple() callbacks without
wasting time on iterations.
Add respective code to gpiod_get/set_array_bitmap_complex() functions.
Pins not applicable for fast path are processed as before, skipping
over the 'fast' ones.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/board.rst | 15 ++++++
Documentation/driver-api/gpio/consumer.rst | 8 +++
drivers/gpio/gpiolib.c | 87 ++++++++++++++++++++++++++++--
3 files changed, 105 insertions(+), 5 deletions(-)
diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
index 2c112553df84..c66821e033c2 100644
--- a/Documentation/driver-api/gpio/board.rst
+++ b/Documentation/driver-api/gpio/board.rst
@@ -193,3 +193,18 @@ And the table can be added to the board code as follows::
The line will be hogged as soon as the gpiochip is created or - in case the
chip was created earlier - when the hog table is registered.
+
+Arrays of pins
+--------------
+In addition to requesting pins belonging to a function one by one, a device may
+also request an array of pins assigned to the function. The way those pins are
+mapped to the device determines if the array qualifies for fast bitmap
+processing. If yes, a bitmap is passed over get/set array functions directly
+between a caller and a respective .get/set_multiple() callback of a GPIO chip.
+
+In order to qualify for fast bitmap processing, the pin mapping must meet the
+following requirements:
+- it must belong to the same chip as other 'fast' pins of the function,
+- its index within the function must match its hardware number within the chip.
+
+Open drain and open source pins are excluded from fast bitmap output processing.
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 0afd95a12b10..cf992e5ab976 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -388,6 +388,14 @@ array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
+Still better performance may be achieved if array indexes of the descriptors
+match hardware pin numbers of a single chip. If an array passed to a get/set
+array function matches the one obtained from gpiod_get_array() and array_info
+associated with the array is also passed, the function may take a fast bitmap
+processing path, passing the value_bitmap argument directly to the respective
+.get/set_multiple() callback of the chip. That allows for utilization of GPIO
+banks as data I/O ports without much loss of performance.
+
The return value of gpiod_get_array_value() and its variants is 0 on success
or negative on error. Note the difference to gpiod_get_value(), which returns
0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4d26cdbdb7cf..b799a89c4c17 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2787,7 +2787,36 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
- int i = 0;
+ int err, i = 0;
+
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ err = gpio_chip_get_multiple(array_info->chip,
+ array_info->get_mask,
+ value_bitmap);
+ if (err)
+ return err;
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ if (bitmap_full(array_info->get_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->get_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
@@ -2818,7 +2847,12 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
__set_bit(hwgpio, mask);
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
@@ -2829,7 +2863,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
return ret;
}
- for (j = first; j < i; j++) {
+ for (j = first; j < i; ) {
const struct gpio_desc *desc = desc_array[j];
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(hwgpio, bits);
@@ -2838,6 +2872,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
value = !value;
__assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask, i, j);
+ else
+ j++;
}
if (mask != fastpath)
@@ -3039,6 +3078,32 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
{
int i = 0;
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
+ value_bitmap);
+
+ if (bitmap_full(array_info->set_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->set_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
+
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
@@ -3066,7 +3131,14 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(i, value_bitmap);
- if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+ /*
+ * Pins applicable for fast input but not for
+ * fast output processing may have been already
+ * inverted inside the fast path, skip them.
+ */
+ if (!raw && !(array_info &&
+ test_bit(i, array_info->invert_mask)) &&
+ test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
trace_gpio_value(desc_to_gpio(desc), 0, value);
/*
@@ -3085,7 +3157,12 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
__clear_bit(hwgpio, bits);
count++;
}
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->set_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-09-01 0:23 ` Peter Rosin
2018-09-04 15:28 ` kbuild test robot
2018-09-04 15:28 ` kbuild test robot
2 siblings, 0 replies; 75+ messages in thread
From: Peter Rosin @ 2018-09-01 0:23 UTC (permalink / raw)
To: Janusz Krzysztofik, Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby,
Willy Tarreau, Geert Uytterhoeven, linux-doc, linux-i2
On 2018-09-01 00:56, Janusz Krzysztofik wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while processing array of results obtained
> from, or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
> diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
> index 401308e3d036..e28ddc20000d 100644
> --- a/drivers/i2c/muxes/i2c-mux-gpio.c
> +++ b/drivers/i2c/muxes/i2c-mux-gpio.c
> @@ -22,18 +22,16 @@ struct gpiomux {
> struct i2c_mux_gpio_platform_data data;
> unsigned gpio_base;
> struct gpio_desc **gpios;
> - int *values;
> };
>
> static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
> {
> - int i;
> -
> - for (i = 0; i < mux->data.n_gpios; i++)
> - mux->values[i] = (val >> i) & 1;
> + DECLARE_BITMAP(value_bitmap, mux->data.n_gpios);
Picking a random driver for this comment, it applies to many of them.
I think this creates a VLA? Can't you, for the bit-count, just go with
BITS_PER_TYPE(unsigned)? Or whatever is appropriate for the driver
in question.
Also, I find that where you use DECLARE_BITMAP, the _bitmap suffix is
just noise and I would very much like to zap it.
Cheers,
Peter
> +
> + *value_bitmap = val;
>
> gpiod_set_array_value_cansleep(mux->data.n_gpios,
> - mux->gpios, mux->values);
> + mux->gpios, value_bitmap);
> }
>
> static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
> @@ -182,15 +180,13 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
> return -EPROBE_DEFER;
>
> muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
> - mux->data.n_gpios * sizeof(*mux->gpios) +
> - mux->data.n_gpios * sizeof(*mux->values), 0,
> + mux->data.n_gpios * sizeof(*mux->gpios), 0,
> i2c_mux_gpio_select, NULL);
> if (!muxc) {
> ret = -ENOMEM;
> goto alloc_failed;
> }
> mux->gpios = muxc->priv;
> - mux->values = (int *)(mux->gpios + mux->data.n_gpios);
> muxc->priv = mux;
>
> platform_set_drvdata(pdev, muxc);
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-30 11:10 ` Miguel Ojeda
2018-08-30 15:35 ` David Laight
@ 2018-09-02 10:19 ` Janusz Krzysztofik
1 sibling, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-02 10:19 UTC (permalink / raw)
To: Miguel Ojeda
Cc: Linus Walleij, Jonathan Corbet, Peter Korsgaard, Peter Rosin,
Ulf Hansson, Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby,
Willy Tarreau, Geert Uytterhoeven, Linux
Hi Miguel,
On Thursday, August 30, 2018 1:10:59 PM CEST Miguel Ojeda wrote:
> Hi Janusz,
>
> On Wed, Aug 29, 2018 at 10:48 PM, Janusz Krzysztofik
> <jmkrzyszt@gmail.com> wrote:
> > ...
> > /* High nibble + RS, RW */
> > - for (i = 4; i < 8; i++)
> > - values[PIN_DATA0 + i] = !!(val & BIT(i));
> > - values[PIN_CTRL_RS] = rs;
> > + value_bitmap[0] = val;
> > + __assign_bit(PIN_CTRL_RS, value_bitmap, rs);
> > n = 5;
> > if (hd->pins[PIN_CTRL_RW]) {
> > - values[PIN_CTRL_RW] = 0;
> > + __clear_bit(PIN_CTRL_RW, value_bitmap);
> > n++;
> > }
> > + value_bitmap[0] >>= PIN_DATA4;
> >
> > /* Present the data to the port */
> > - gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
> > - &values[PIN_DATA4]);
> > + gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
value_bitmap);
> >
> > hd44780_strobe_gpio(hd);
> >
> > /* Low nibble */
> > - for (i = 0; i < 4; i++)
> > - values[PIN_DATA4 + i] = !!(val & BIT(i));
> > + value_bitmap[0] &= ~((1 << PIN_DATA4) - 1);
> > + value_bitmap[0] |= val & ~((1 << PIN_DATA4) - 1);
>
> This is still wrong! What I originally meant in my v4 review is that
> there is an extra ~ in the second line.
Indeed, that's wrong, I missed your original point, sorry.
> Also, a couple of general comments:
>
> - Please review the list of CCs (I was not CC'd originally, so maybe
> there are other maintainers that aren't, either)
That's probably because early versions of the series, prior to v4, were not
touching existing GPIO API so there were no changes to users of gpiod_get/
set_array_value() and their variants. From v4 on, you are in the loop so don't
worry, you haven't missed anything.
But anyway, thanks for your suggestion to review the Cc; list, I've done that
for v7 and added still a few people who contributed most to the code being
changed.
> - In general, the new code seems harder to read than the original one
> (but that is my impression).
I hope we are slowly approaching acceptable readability in recent iterations.
Thanks,
Janusz
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH v7 0/4] gpiolib: speed up GPIO array processing
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (3 preceding siblings ...)
2018-08-31 22:56 ` [PATCH v6 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
@ 2018-09-02 12:01 ` Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (4 more replies)
4 siblings, 5 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-02 12:01 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Tony Lindgren,
Lukas Wunner, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King, Lars-Peter Clausen
The goal is to boost performance of get/set array functions while
processing GPIO arrays which represent pins of a signle chip in
hardware order. If resulting performance is close to PIO, GPIO API
can be used for data I/O without much loss of speed.
Created and tested on a low end Amstrad Delta board with NAND driver
updated to use GPIO API for data I/O. Performance degrade compared to
PIO is much better than before the optimization though not quite
satisfactory on my test hardware.
Janusz Krzysztofik (4):
gpiolib: Pass bitmaps, not integer arrays, to get/set array
gpiolib: Identify arrays matching GPIO hardware
gpiolib: Pass array info to get/set array functions
gpiolib: Implement fast processing path in get/set array
Changelog:
v7:
- add more people to Cc: - authors and/or those who contributed most to
the drivers in scope of the change,
[PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set:
- avoid VLAs, use data source type bit number as bitmap size if not
constant - great recommendation by Peter Rosin, thanks,
- revert names of local variables declared with DECLARE_BITMAP() from
'value_bitmap' to original names of value arrays they replace (but not
'value_array') - inspired by Peter Rosin suggestion - thanks!
drivers/gpio/gpio-max3191x.c:
- use bitmap_alloc() to be more consistent with DECLARE_BITMAP() pattern
used by other consumers,
drivers/phy/motorola/phy-mapphone-mdm6600.c:
- no need to mask unused bits of val before its assignment to bitmap,
passing PHY_MDM6600_NR_CMD_LINES to gpiod_set_array_value() as array/
bitmap size provides sufficient protection.
v6:
[PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set
- use DECLARE_BITMAP() macro for declaring value_bitmap - great idea by
David Laight, thanks!
drivers/auxdisplay/hd44780.c:
- simplify the code and adjust comments as recommended by Geert
Uytterhoeven - thanks!,
drivers/i2c/muxes/i2c-mux-gpio.c:
- drop .values member of struct gpiomux - details provided by Peter
Rosin, thanks!,
drivers/mux/gpio.c:
- drop .val member of struct mux_gpio - details provided by Peter
Rosin, thanks!,
drivers/net/phy/mdio-mux-gpio.c:
- drop .values member of struct mdio_mux_gpio_state and its processsing.
v5:
[PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set
- drivers/i2c/muxes/i2c-mux-gpio.c:
- drop assigment of values to struct gpiomux.values, as recommended
by Peter Rosin - thanks!,
- mark the .values member of the structure as obsolete,
- drivers/mux/gpio.c:
- drop assigment of values to struct mux_gpio.val, also recommended
by Peter Rosin - thanks!,
- merk the .val member of the structure as obsolete,
- drivers/auxdisplay/hd44780.c:
- fix incorrect bitmap size,
- use >>= operator to simplify notation,
both catched by Miguel Ojeda - thanks!,
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware
- add Cc: clause.
[PATCH v5 3/4] gpiolib: Pass array info to get/set array functions
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 4/4] gpiolib: Implement fast processing path in get/set
- add Cc: clause.
v4:
That series was a follow up of the former "mtd: rawnand: ams-delta: Use
gpio-omap accessors for data I/O" which already contained some changes
to gpiolib. Those previous attempts were commented by Borris Brezillon
who suggested using GPIO API modified to accept bitmaps, and by Linus
Walleij who suggested still more great ideas for further immprovement
of the proposed API changes - thanks!
diffstat:
Documentation/driver-api/gpio/board.rst | 15 +
Documentation/driver-api/gpio/consumer.rst | 48 +++-
drivers/auxdisplay/hd44780.c | 67 ++----
drivers/bus/ts-nbus.c | 20 --
drivers/gpio/gpio-max3191x.c | 16 +
drivers/gpio/gpiolib.c | 273 ++++++++++++++++++++++------
drivers/gpio/gpiolib.h | 15 +
drivers/i2c/muxes/i2c-mux-gpio.c | 16 -
drivers/mmc/core/pwrseq_simple.c | 15 -
drivers/mux/gpio.c | 16 -
drivers/net/phy/mdio-mux-gpio.c | 13 -
drivers/pcmcia/soc_common.c | 10 -
drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 -
drivers/staging/iio/adc/ad7606.c | 12 -
drivers/tty/serial/serial_mctrl_gpio.c | 9
include/linux/gpio/consumer.h | 35 ++-
16 files changed, 396 insertions(+), 201 deletions(-)
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
@ 2018-09-02 12:01 ` Janusz Krzysztofik
2018-09-02 13:21 ` Lukas Wunner
` (4 more replies)
2018-09-02 12:01 ` [PATCH v7 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
` (3 subsequent siblings)
4 siblings, 5 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-02 12:01 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Tony Lindgren,
Lukas Wunner, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King, Lars-Peter Clausen
Most users of get/set array functions iterate consecutive bits of data,
usually a single integer, while processing array of results obtained
from, or building an array of values to be passed to those functions.
Save time wasted on those iterations by changing the functions' API to
accept bitmaps.
All current users are updated as well.
More benefits from the change are expected as soon as planned support
for accepting/passing those bitmaps directly from/to respective GPIO
chip callbacks if applicable is implemented.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
---
Documentation/driver-api/gpio/consumer.rst | 22 ++++----
drivers/auxdisplay/hd44780.c | 59 +++++++--------------
drivers/bus/ts-nbus.c | 15 ++----
drivers/gpio/gpio-max3191x.c | 10 ++--
drivers/gpio/gpiolib.c | 82 +++++++++++++++--------------
drivers/gpio/gpiolib.h | 4 +-
drivers/i2c/muxes/i2c-mux-gpio.c | 13 ++---
drivers/mmc/core/pwrseq_simple.c | 13 ++---
drivers/mux/gpio.c | 13 ++---
drivers/net/phy/mdio-mux-gpio.c | 11 ++--
drivers/pcmcia/soc_common.c | 8 +--
drivers/phy/motorola/phy-mapphone-mdm6600.c | 13 ++---
drivers/staging/iio/adc/ad7606.c | 9 ++--
drivers/tty/serial/serial_mctrl_gpio.c | 7 +--
include/linux/gpio/consumer.h | 18 ++++---
15 files changed, 129 insertions(+), 168 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index aa03f389d41d..ed68042ddccf 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -323,29 +323,29 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
GPIOs belonging to the same bank or chip simultaneously if supported by the
@@ -356,8 +356,8 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
- * value_array - an array to store the GPIOs' values (get) or
- an array of values to assign to the GPIOs (set)
+ * value_bitmap - a bitmap to store the GPIOs' values (get) or
+ a bitmap of values to assign to the GPIOs (set)
The descriptor array can be obtained using the gpiod_get_array() function
or one of its variants. If the group of descriptors returned by that function
@@ -366,7 +366,7 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_values);
+ my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index f1a42f0f1ded..333e30e378b5 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -62,17 +62,12 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
/* write to an LCD panel register in 8 bit GPIO mode */
static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW */
- unsigned int i, n;
-
- for (i = 0; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
- n = 9;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
+ unsigned int n;
+
+ *values = val;
+ __assign_bit(8, values, rs);
+ n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
/* Present the data to the port */
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
@@ -83,32 +78,25 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
/* write to an LCD panel register in 4 bit GPIO mode */
static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
- unsigned int i, n;
+ DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
+ unsigned int n;
/* High nibble + RS, RW */
- for (i = 4; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
- n = 5;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ *values = val >> 4;
+ __assign_bit(4, values, rs);
+ n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
hd44780_strobe_gpio(hd);
/* Low nibble */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(val & BIT(i));
+ *values &= ~0x0fUL;
+ *values |= val & 0x0f;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
hd44780_strobe_gpio(hd);
}
@@ -155,23 +143,16 @@ static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)
/* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
struct hd44780 *hd = lcd->drvdata;
- unsigned int i, n;
+ unsigned int n;
/* Command nibble + RS, RW */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(cmd & BIT(i));
- values[PIN_CTRL_RS] = 0;
- n = 5;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ *values = cmd & 0x0f;
+ n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 073fd9011154..6499957a8044 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -110,11 +110,9 @@ static void ts_nbus_set_direction(struct ts_nbus *ts_nbus, int direction)
*/
static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
- int i;
- int values[8];
+ DECLARE_BITMAP(values, 8);
- for (i = 0; i < 8; i++)
- values[i] = 0;
+ *values = 0;
gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
@@ -157,14 +155,9 @@ static int ts_nbus_read_byte(struct ts_nbus *ts_nbus, u8 *val)
static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
{
struct gpio_descs *gpios = ts_nbus->data;
- int i;
- int values[8];
+ DECLARE_BITMAP(values, 8);
- for (i = 0; i < 8; i++)
- if (byte & BIT(i))
- values[i] = 1;
- else
- values[i] = 0;
+ *values = byte;
gpiod_set_array_value_cansleep(8, gpios->desc, values);
}
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index b5b9cb1fda50..bd4a245fc5a0 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -315,14 +315,16 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
int value)
{
- int i, *values;
+ unsigned long *values;
- values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
+ values = bitmap_alloc(ndescs, GFP_KERNEL);
if (!values)
return;
- for (i = 0; i < ndescs; i++)
- values[i] = value;
+ if (value)
+ bitmap_fill(values, ndescs);
+ else
+ bitmap_zero(values, ndescs);
gpiod_set_array_value_cansleep(ndescs, desc, values);
kfree(values);
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8f8a1999393..434d09779a1f 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -427,7 +427,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
struct linehandle_state *lh = filep->private_data;
void __user *ip = (void __user *)arg;
struct gpiohandle_data ghd;
- int vals[GPIOHANDLES_MAX];
+ DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
int i;
if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
@@ -442,7 +442,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
memset(&ghd, 0, sizeof(ghd));
for (i = 0; i < lh->numdescs; i++)
- ghd.values[i] = vals[i];
+ ghd.values[i] = test_bit(i, vals);
if (copy_to_user(ip, &ghd, sizeof(ghd)))
return -EFAULT;
@@ -461,7 +461,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
/* Clamp all values to [0,1] */
for (i = 0; i < lh->numdescs; i++)
- vals[i] = !!ghd.values[i];
+ __assign_bit(i, vals, !!ghd.values[i]);
/* Reuse the array setting function */
return gpiod_set_array_value_complex(false,
@@ -2784,7 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -2835,7 +2835,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
- value_array[j] = value;
+ __assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
}
@@ -2895,9 +2895,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
/**
* gpiod_get_raw_array_value() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -2907,20 +2907,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
/**
* gpiod_get_array_value() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitnap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -2929,12 +2930,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3027,7 +3029,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -3056,7 +3058,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
do {
struct gpio_desc *desc = desc_array[i];
int hwgpio = gpio_chip_hwgpio(desc);
- int value = value_array[i];
+ int value = test_bit(i, value_bitmap);
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
@@ -3152,9 +3154,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
/**
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3163,20 +3165,21 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
* complain if the GPIO chip functions potentially sleep.
*/
int gpiod_set_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
/**
* gpiod_set_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3185,12 +3188,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
* complain if the GPIO chip functions potentially sleep.
*/
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3410,9 +3414,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
/**
* gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -3422,21 +3426,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
/**
* gpiod_get_array_value_cansleep() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -3445,13 +3449,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3493,9 +3497,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
/**
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3504,13 +3508,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3533,9 +3537,9 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
/**
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3544,13 +3548,13 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index a7e49fef73d4..11e83d2eef89 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -187,11 +187,11 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 401308e3d036..0717cfb56732 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -22,18 +22,15 @@ struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
struct gpio_desc **gpios;
- int *values;
};
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
- int i;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(val));
- for (i = 0; i < mux->data.n_gpios; i++)
- mux->values[i] = (val >> i) & 1;
+ *values = val;
- gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, mux->values);
+ gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, values);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@@ -182,15 +179,13 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
- mux->data.n_gpios * sizeof(*mux->gpios) +
- mux->data.n_gpios * sizeof(*mux->values), 0,
+ mux->data.n_gpios * sizeof(*mux->gpios), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
goto alloc_failed;
}
mux->gpios = muxc->priv;
- mux->values = (int *)(mux->gpios + mux->data.n_gpios);
muxc->priv = mux;
platform_set_drvdata(pdev, muxc);
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index a8b9fee4d62a..5ad764c88b50 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -40,18 +40,13 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
if (!IS_ERR(reset_gpios)) {
- int i, *values;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(value));
int nvalues = reset_gpios->ndescs;
- values = kmalloc_array(nvalues, sizeof(int), GFP_KERNEL);
- if (!values)
- return;
+ *values = value;
- for (i = 0; i < nvalues; i++)
- values[i] = value;
-
- gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
+ values);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 6fdd9316db8b..1b6b4cc22a2c 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -17,20 +17,17 @@
struct mux_gpio {
struct gpio_descs *gpios;
- int *val;
};
static int mux_gpio_set(struct mux_control *mux, int state)
{
struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
- int i;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(state));
- for (i = 0; i < mux_gpio->gpios->ndescs; i++)
- mux_gpio->val[i] = (state >> i) & 1;
+ *values = state;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc,
- mux_gpio->val);
+ mux_gpio->gpios->desc, values);
return 0;
}
@@ -58,13 +55,11 @@ static int mux_gpio_probe(struct platform_device *pdev)
if (pins < 0)
return pins;
- mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio) +
- pins * sizeof(*mux_gpio->val));
+ mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio));
if (IS_ERR(mux_chip))
return PTR_ERR(mux_chip);
mux_gpio = mux_chip_priv(mux_chip);
- mux_gpio->val = (int *)(mux_gpio + 1);
mux_chip->ops = &mux_gpio_ops;
mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index bc90764a8b8d..eb8c56b83c70 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -20,23 +20,21 @@
struct mdio_mux_gpio_state {
struct gpio_descs *gpios;
void *mux_handle;
- int values[];
};
static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
void *data)
{
struct mdio_mux_gpio_state *s = data;
- unsigned int n;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
if (current_child == desired_child)
return 0;
- for (n = 0; n < s->gpios->ndescs; n++)
- s->values[n] = (desired_child >> n) & 1;
+ *values = desired_child;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- s->values);
+ values);
return 0;
}
@@ -51,8 +49,7 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
if (IS_ERR(gpios))
return PTR_ERR(gpios);
- s = devm_kzalloc(&pdev->dev, struct_size(s, values, gpios->ndescs),
- GFP_KERNEL);
+ s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
if (!s) {
gpiod_put_array(gpios);
return -ENOMEM;
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index c5f2344c189b..388dbdc46129 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -351,15 +351,17 @@ static int soc_common_pcmcia_config_skt(
if (ret == 0) {
struct gpio_desc *descs[2];
- int values[2], n = 0;
+ DECLARE_BITMAP(values, 2);
+ int n = 0;
if (skt->gpio_reset) {
descs[n] = skt->gpio_reset;
- values[n++] = !!(state->flags & SS_RESET);
+ __assign_bit(n++, values, !!(state->flags & SS_RESET));
}
if (skt->gpio_bus_enable) {
descs[n] = skt->gpio_bus_enable;
- values[n++] = !!(state->flags & SS_OUTPUT_ENA);
+ __assign_bit(n++, values,
+ !!(state->flags & SS_OUTPUT_ENA));
}
if (n)
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 0075fb0bef8c..4de7f4577433 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -157,12 +157,9 @@ static const struct phy_ops gpio_usb_ops = {
*/
static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
{
- int values[PHY_MDM6600_NR_CMD_LINES];
- int i;
+ DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
- val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
- for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
- values[i] = (val & BIT(i)) >> i;
+ *values = val;
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
ddata->cmd_gpios->desc, values);
@@ -176,7 +173,7 @@ static void phy_mdm6600_status(struct work_struct *work)
{
struct phy_mdm6600 *ddata;
struct device *dev;
- int values[PHY_MDM6600_NR_STATUS_LINES];
+ DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
int error, i, val = 0;
ddata = container_of(work, struct phy_mdm6600, status_work.work);
@@ -189,9 +186,9 @@ static void phy_mdm6600_status(struct work_struct *work)
return;
for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
- val |= values[i] << i;
+ val |= test_bit(i, values) << i;
dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
- __func__, i, values[i], val);
+ __func__, i, test_bit(i, values), val);
}
ddata->status = val;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 25b9fcd5e3a4..053c9b7f1084 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -202,7 +202,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
- int values[3];
+ DECLARE_BITMAP(values, 3);
int ret, i;
switch (mask) {
@@ -227,13 +227,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
- values[0] = (ret >> 0) & 1;
- values[1] = (ret >> 1) & 1;
- values[2] = (ret >> 2) & 1;
+ *values = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- values);
+ gpiod_set_array_value(3, st->gpio_os->desc, values);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 1c06325beaca..30444fd6cf32 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -40,7 +40,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
{
enum mctrl_gpio_idx i;
struct gpio_desc *desc_array[UART_GPIO_MAX];
- int value_array[UART_GPIO_MAX];
+ DECLARE_BITMAP(values, UART_GPIO_MAX);
unsigned int count = 0;
if (gpios == NULL)
@@ -49,10 +49,11 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
for (i = 0; i < UART_GPIO_MAX; i++)
if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
desc_array[count] = gpios->gpio[i];
- value_array[count] = !!(mctrl & mctrl_gpios_desc[i].mctrl);
+ __assign_bit(count, values,
+ !!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, value_array);
+ gpiod_set_array_value(count, desc_array, values);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 21ddbe440030..1b21dc7b0fad 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -104,36 +104,38 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
--
2.16.4
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v7 2/4] gpiolib: Identify arrays matching GPIO hardware
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-09-02 12:01 ` Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
` (2 subsequent siblings)
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-02 12:01 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Certain GPIO array lookup results may map directly to GPIO pins of a
single GPIO chip in hardware order. If that condition is recognized
and handled efficiently, significant performance gain of get/set array
functions may be possible.
While processing a request for an array of GPIO descriptors, identify
those which represent corresponding pins of a single GPIO chip. Skip
over pins which require open source or open drain special processing.
Moreover, identify pins which require inversion. Pass a pointer to
that information with the array to the caller so it can benefit from
enhanced performance as soon as get/set array functions can accept and
make efficient use of it.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 4 +-
drivers/gpio/gpiolib.c | 72 +++++++++++++++++++++++++++++-
drivers/gpio/gpiolib.h | 9 ++++
include/linux/gpio/consumer.h | 9 ++++
4 files changed, 92 insertions(+), 2 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index ed68042ddccf..7e0298b9a7b9 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -109,9 +109,11 @@ For a function using multiple GPIOs all of those can be obtained with one call::
enum gpiod_flags flags)
This function returns a struct gpio_descs which contains an array of
-descriptors::
+descriptors. It also contains a pointer to a gpiolib private structure which,
+if passed back to get/set array functions, may speed up I/O proocessing::
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 434d09779a1f..141f2f290538 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4174,7 +4174,9 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
{
struct gpio_desc *desc;
struct gpio_descs *descs;
- int count;
+ struct gpio_array *array_info = NULL;
+ struct gpio_chip *chip;
+ int count, bitmap_size;
count = gpiod_count(dev, con_id);
if (count < 0)
@@ -4190,9 +4192,77 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
gpiod_put_array(descs);
return ERR_CAST(desc);
}
+
descs->desc[descs->ndescs] = desc;
+
+ chip = gpiod_to_chip(desc);
+ /*
+ * Select a chip of first array member
+ * whose index matches its pin hardware number
+ * as a candidate for fast bitmap processing.
+ */
+ if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) {
+ struct gpio_descs *array;
+
+ bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
+ chip->ngpio : count);
+
+ array = kzalloc(struct_size(descs, desc, count) +
+ struct_size(array_info, invert_mask,
+ 3 * bitmap_size), GFP_KERNEL);
+ if (!array) {
+ gpiod_put_array(descs);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ memcpy(array, descs,
+ struct_size(descs, desc, descs->ndescs + 1));
+ kfree(descs);
+
+ descs = array;
+ array_info = (void *)(descs->desc + count);
+ array_info->get_mask = array_info->invert_mask +
+ bitmap_size;
+ array_info->set_mask = array_info->get_mask +
+ bitmap_size;
+
+ array_info->desc = descs->desc;
+ array_info->size = count;
+ array_info->chip = chip;
+ bitmap_set(array_info->get_mask, descs->ndescs,
+ count - descs->ndescs);
+ bitmap_set(array_info->set_mask, descs->ndescs,
+ count - descs->ndescs);
+ descs->info = array_info;
+ }
+ /*
+ * Unmark members which don't qualify for fast bitmap
+ * processing (different chip, not in hardware order)
+ */
+ if (array_info && (chip != array_info->chip ||
+ gpio_chip_hwgpio(desc) != descs->ndescs)) {
+ __clear_bit(descs->ndescs, array_info->get_mask);
+ __clear_bit(descs->ndescs, array_info->set_mask);
+ } else if (array_info) {
+ /* Exclude open drain or open source from fast output */
+ if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
+ gpiochip_line_is_open_source(chip, descs->ndescs))
+ __clear_bit(descs->ndescs,
+ array_info->set_mask);
+ /* Identify 'fast' pins which require invertion */
+ if (gpiod_is_active_low(desc))
+ __set_bit(descs->ndescs,
+ array_info->invert_mask);
+ }
+
descs->ndescs++;
}
+ if (array_info)
+ dev_dbg(dev,
+ "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
+ array_info->chip->label, array_info->size,
+ *array_info->get_mask, *array_info->set_mask,
+ *array_info->invert_mask);
return descs;
}
EXPORT_SYMBOL_GPL(gpiod_get_array);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 11e83d2eef89..b60905d558b1 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -183,6 +183,15 @@ static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
}
#endif
+struct gpio_array {
+ struct gpio_desc **desc;
+ unsigned int size;
+ struct gpio_chip *chip;
+ unsigned long *get_mask;
+ unsigned long *set_mask;
+ unsigned long invert_mask[];
+};
+
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 1b21dc7b0fad..8dede3e886af 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -17,11 +17,20 @@ struct device;
*/
struct gpio_desc;
+/**
+ * Opaque descriptor for a structure of GPIO array attributes. This structure
+ * is attached to struct gpiod_descs obtained from gpiod_get_array() and can be
+ * passed back to get/set array functions in order to activate fast processing
+ * path if applicable.
+ */
+struct gpio_array;
+
/**
* Struct containing an array of descriptors that can be obtained using
* gpiod_get_array().
*/
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
};
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
@ 2018-09-02 12:01 ` Janusz Krzysztofik
2018-09-03 14:21 ` Geert Uytterhoeven
` (2 more replies)
2018-09-02 12:01 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
4 siblings, 3 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-02 12:01 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Tony Lindgren,
Lukas Wunner, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King, Lars-Peter Clausen
In order to make use of array info obtained from gpiod_get_array() and
speed up processing of arrays matching single GPIO chip layout, that
information must be passed to get/set array functions. Extend the
functions' API with that additional parameter and update all users.
Pass NULL if a user bulids an array itself from single GPIOs.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
---
Documentation/driver-api/gpio/consumer.rst | 14 +++++++++++--
drivers/auxdisplay/hd44780.c | 8 ++++----
drivers/bus/ts-nbus.c | 5 +++--
drivers/gpio/gpio-max3191x.c | 6 ++++--
drivers/gpio/gpiolib.c | 32 +++++++++++++++++++++--------
drivers/gpio/gpiolib.h | 2 ++
drivers/i2c/muxes/i2c-mux-gpio.c | 3 ++-
drivers/mmc/core/pwrseq_simple.c | 2 +-
drivers/mux/gpio.c | 3 ++-
drivers/net/phy/mdio-mux-gpio.c | 2 +-
drivers/pcmcia/soc_common.c | 2 +-
drivers/phy/motorola/phy-mapphone-mdm6600.c | 4 +++-
drivers/staging/iio/adc/ad7606.c | 3 ++-
drivers/tty/serial/serial_mctrl_gpio.c | 2 +-
include/linux/gpio/consumer.h | 8 ++++++++
15 files changed, 70 insertions(+), 26 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 7e0298b9a7b9..0afd95a12b10 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -325,28 +325,36 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
@@ -358,6 +366,7 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
+ * array_info - optional information obtained from gpiod_array_get()
* value_bitmap - a bitmap to store the GPIOs' values (get) or
a bitmap of values to assign to the GPIOs (set)
@@ -368,12 +377,13 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_value_bitmap);
+ my_gpio_descs->info, my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
gpiod_get_array(). Afterwards the array of descriptors has to be setup
-manually before it can be passed to one of the above functions.
+manually before it can be passed to one of the above functions. In that case,
+array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index 333e30e378b5..033024df3962 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -70,7 +70,7 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL, values);
hd44780_strobe_gpio(hd);
}
@@ -87,7 +87,7 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
@@ -96,7 +96,7 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
*values |= val & 0x0f;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
}
@@ -152,7 +152,7 @@ static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 6499957a8044..60796f2db6fc 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -114,7 +114,8 @@ static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
*values = 0;
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc,
+ ts_nbus->data->info, values);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -159,7 +160,7 @@ static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
*values = byte;
- gpiod_set_array_value_cansleep(8, gpios->desc, values);
+ gpiod_set_array_value_cansleep(8, gpios->desc, gpios->info, values);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index bd4a245fc5a0..9a8876abeb57 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -313,6 +313,7 @@ static int max3191x_set_config(struct gpio_chip *gpio, unsigned int offset,
static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
+ struct gpio_array *info,
int value)
{
unsigned long *values;
@@ -326,7 +327,7 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
else
bitmap_zero(values, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, values);
+ gpiod_set_array_value_cansleep(ndescs, desc, info, values);
kfree(values);
}
@@ -399,7 +400,8 @@ static int max3191x_probe(struct spi_device *spi)
if (max3191x->modesel_pins)
gpiod_set_array_single_value_cansleep(
max3191x->modesel_pins->ndescs,
- max3191x->modesel_pins->desc, max3191x->mode);
+ max3191x->modesel_pins->desc,
+ max3191x->modesel_pins->info, max3191x->mode);
max3191x->ignore_uv = device_property_read_bool(dev,
"maxim,ignore-undervoltage");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 141f2f290538..cef6ee31fe05 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -436,6 +436,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
+ NULL,
vals);
if (ret)
return ret;
@@ -468,6 +469,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
+ NULL,
vals);
}
return -EINVAL;
@@ -2784,6 +2786,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -2908,12 +2911,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
*/
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
@@ -2931,12 +2936,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
*/
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3029,6 +3036,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -3166,12 +3174,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
*/
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
@@ -3189,12 +3198,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
*/
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3426,13 +3436,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
@@ -3449,13 +3461,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3508,13 +3522,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3548,13 +3563,14 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index b60905d558b1..b65ca896b24d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -196,10 +196,12 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 0717cfb56732..c6e1c7776a56 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -30,7 +30,8 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
*values = val;
- gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, values);
+ gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, NULL,
+ values);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 5ad764c88b50..a17252f51418 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -46,7 +46,7 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
*values = value;
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
- values);
+ reset_gpios->info, values);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 1b6b4cc22a2c..4f58a3198c4e 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -27,7 +27,8 @@ static int mux_gpio_set(struct mux_control *mux, int state)
*values = state;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc, values);
+ mux_gpio->gpios->desc,
+ mux_gpio->gpios->info, values);
return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index eb8c56b83c70..7d8bea21f099 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -34,7 +34,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
*values = desired_child;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- values);
+ s->gpios->info, values);
return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index 388dbdc46129..8447eeeaf3fe 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -365,7 +365,7 @@ static int soc_common_pcmcia_config_skt(
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, values);
+ gpiod_set_array_value_cansleep(n, descs, NULL, values);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 4de7f4577433..08e71c7ae199 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -162,7 +162,8 @@ static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
*values = val;
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, values);
+ ddata->cmd_gpios->desc,
+ ddata->cmd_gpios->info, values);
}
/**
@@ -181,6 +182,7 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
+ ddata->status_gpios->info,
values);
if (error)
return;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 053c9b7f1084..d32dba23e782 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -230,7 +230,8 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
*values = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(3, st->gpio_os->desc, values);
+ gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
+ values);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 30444fd6cf32..d7934ca55e2f 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -53,7 +53,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
!!(mctrl & mctrl_gpios_desc[i].mctrl));
count++;
}
- gpiod_set_array_value(count, desc_array, values);
+ gpiod_set_array_value(count, desc_array, NULL, values);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 8dede3e886af..bf037ebe2ed8 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -114,36 +114,44 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
--
2.16.4
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (2 preceding siblings ...)
2018-09-02 12:01 ` [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
@ 2018-09-02 12:01 ` Janusz Krzysztofik
[not found] ` <CGME20180920101151eucas1p221f5a1715b8556bb9d99bf08fe09ce6f@eucas1p2.samsung.com>
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
4 siblings, 1 reply; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-02 12:01 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Tony Lindgren,
Lukas Wunner, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King, Lars-Peter Clausen
Certain GPIO descriptor arrays returned by gpio_get_array() may contain
information on direct mapping of array members to pins of a single GPIO
chip in hardware order. In such cases, bitmaps of values can be passed
directly from/to the chip's .get/set_multiple() callbacks without
wasting time on iterations.
Add respective code to gpiod_get/set_array_bitmap_complex() functions.
Pins not applicable for fast path are processed as before, skipping
over the 'fast' ones.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/board.rst | 15 ++++++
Documentation/driver-api/gpio/consumer.rst | 8 +++
drivers/gpio/gpiolib.c | 87 ++++++++++++++++++++++++++++--
3 files changed, 105 insertions(+), 5 deletions(-)
diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
index 2c112553df84..c66821e033c2 100644
--- a/Documentation/driver-api/gpio/board.rst
+++ b/Documentation/driver-api/gpio/board.rst
@@ -193,3 +193,18 @@ And the table can be added to the board code as follows::
The line will be hogged as soon as the gpiochip is created or - in case the
chip was created earlier - when the hog table is registered.
+
+Arrays of pins
+--------------
+In addition to requesting pins belonging to a function one by one, a device may
+also request an array of pins assigned to the function. The way those pins are
+mapped to the device determines if the array qualifies for fast bitmap
+processing. If yes, a bitmap is passed over get/set array functions directly
+between a caller and a respective .get/set_multiple() callback of a GPIO chip.
+
+In order to qualify for fast bitmap processing, the pin mapping must meet the
+following requirements:
+- it must belong to the same chip as other 'fast' pins of the function,
+- its index within the function must match its hardware number within the chip.
+
+Open drain and open source pins are excluded from fast bitmap output processing.
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 0afd95a12b10..cf992e5ab976 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -388,6 +388,14 @@ array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
+Still better performance may be achieved if array indexes of the descriptors
+match hardware pin numbers of a single chip. If an array passed to a get/set
+array function matches the one obtained from gpiod_get_array() and array_info
+associated with the array is also passed, the function may take a fast bitmap
+processing path, passing the value_bitmap argument directly to the respective
+.get/set_multiple() callback of the chip. That allows for utilization of GPIO
+banks as data I/O ports without much loss of performance.
+
The return value of gpiod_get_array_value() and its variants is 0 on success
or negative on error. Note the difference to gpiod_get_value(), which returns
0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index cef6ee31fe05..b9d083fb13ee 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2789,7 +2789,36 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
- int i = 0;
+ int err, i = 0;
+
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ err = gpio_chip_get_multiple(array_info->chip,
+ array_info->get_mask,
+ value_bitmap);
+ if (err)
+ return err;
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ if (bitmap_full(array_info->get_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->get_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
@@ -2820,7 +2849,12 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
__set_bit(hwgpio, mask);
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
@@ -2831,7 +2865,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
return ret;
}
- for (j = first; j < i; j++) {
+ for (j = first; j < i; ) {
const struct gpio_desc *desc = desc_array[j];
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(hwgpio, bits);
@@ -2840,6 +2874,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
value = !value;
__assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask, i, j);
+ else
+ j++;
}
if (mask != fastpath)
@@ -3041,6 +3080,32 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
{
int i = 0;
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
+ value_bitmap);
+
+ if (bitmap_full(array_info->set_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->set_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
+
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
@@ -3068,7 +3133,14 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(i, value_bitmap);
- if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+ /*
+ * Pins applicable for fast input but not for
+ * fast output processing may have been already
+ * inverted inside the fast path, skip them.
+ */
+ if (!raw && !(array_info &&
+ test_bit(i, array_info->invert_mask)) &&
+ test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
trace_gpio_value(desc_to_gpio(desc), 0, value);
/*
@@ -3087,7 +3159,12 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
__clear_bit(hwgpio, bits);
count++;
}
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->set_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-09-02 13:21 ` Lukas Wunner
2018-09-03 4:31 ` Matthew Wilcox
` (3 subsequent siblings)
4 siblings, 0 replies; 75+ messages in thread
From: Lukas Wunner @ 2018-09-02 13:21 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski,
Greg Kroah-Hartman, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Jiri Slaby, Willy Tarreau
On Sun, Sep 02, 2018 at 02:01:41PM +0200, Janusz Krzysztofik wrote:
> @@ -461,7 +461,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
>
> /* Clamp all values to [0,1] */
> for (i = 0; i < lh->numdescs; i++)
> - vals[i] = !!ghd.values[i];
> + __assign_bit(i, vals, !!ghd.values[i]);
The "!!" becomes unnecessary and can be removed, same for the code
comment above.
> /**
> * gpiod_get_array_value() - read values from an array of GPIOs
> - * @array_size: number of elements in the descriptor / value arrays
> + * @array_size: number of elements in the descriptor array / value bitmap
> * @desc_array: array of GPIO descriptors whose values will be read
> - * @value_array: array to store the read values
> + * @value_bitnap: bitmap to store the read values
Typo, s/bitnap/bitmap/
Otherwise LGTM.
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-02 13:21 ` Lukas Wunner
@ 2018-09-03 4:31 ` Matthew Wilcox
2018-09-03 14:24 ` Geert Uytterhoeven
2018-09-03 15:07 ` Geert Uytterhoeven
` (2 subsequent siblings)
4 siblings, 1 reply; 75+ messages in thread
From: Matthew Wilcox @ 2018-09-03 4:31 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski,
Greg Kroah-Hartman, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Jiri Slaby, Willy Tarreau
> +++ b/drivers/auxdisplay/hd44780.c
> @@ -62,17 +62,12 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> /* write to an LCD panel register in 8 bit GPIO mode */
> static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW */
> - unsigned int i, n;
> -
> - for (i = 0; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> - n = 9;
> - if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> - n++;
> - }
> + DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
> + unsigned int n;
> +
> + *values = val;
> + __assign_bit(8, values, rs);
> + n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
Doesn't this assume little endian bitmaps? Has anyone tested this on
big-endian machines?
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions
2018-09-02 12:01 ` [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
@ 2018-09-03 14:21 ` Geert Uytterhoeven
2018-09-04 15:23 ` kbuild test robot
2018-09-05 7:11 ` kbuild test robot
2 siblings, 0 replies; 75+ messages in thread
From: Geert Uytterhoeven @ 2018-09-03 14:21 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
peter.korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski, Greg KH,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald, Jiri Slaby,
Willy Tarreau, open list:DOCUMENTATION
On Sun, Sep 2, 2018 at 2:01 PM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> In order to make use of array info obtained from gpiod_get_array() and
> speed up processing of arrays matching single GPIO chip layout, that
> information must be passed to get/set array functions. Extend the
> functions' API with that additional parameter and update all users.
> Pass NULL if a user bulids an array itself from single GPIOs.
builds
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-03 4:31 ` Matthew Wilcox
@ 2018-09-03 14:24 ` Geert Uytterhoeven
0 siblings, 0 replies; 75+ messages in thread
From: Geert Uytterhoeven @ 2018-09-03 14:24 UTC (permalink / raw)
To: Matthew Wilcox
Cc: Janusz Krzysztofik, Linus Walleij, Jonathan Corbet,
Miguel Ojeda Sandonis, peter.korsgaard, Peter Rosin, Ulf Hansson,
Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg KH, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald, Jiri Slaby, Willy Tarreau
On Mon, Sep 3, 2018 at 6:31 AM Matthew Wilcox <willy@infradead.org> wrote:
> > +++ b/drivers/auxdisplay/hd44780.c
> > @@ -62,17 +62,12 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> > /* write to an LCD panel register in 8 bit GPIO mode */
> > static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> > {
> > - int values[10]; /* for DATA[0-7], RS, RW */
> > - unsigned int i, n;
> > -
> > - for (i = 0; i < 8; i++)
> > - values[PIN_DATA0 + i] = !!(val & BIT(i));
> > - values[PIN_CTRL_RS] = rs;
> > - n = 9;
> > - if (hd->pins[PIN_CTRL_RW]) {
> > - values[PIN_CTRL_RW] = 0;
> > - n++;
> > - }
> > + DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
> > + unsigned int n;
> > +
> > + *values = val;
> > + __assign_bit(8, values, rs);
> > + n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
>
> Doesn't this assume little endian bitmaps? Has anyone tested this on
> big-endian machines?
include/linux/bitops.h:
static __always_inline void __assign_bit(long nr, volatile unsigned long *addr,
bool value)
{
if (value)
__set_bit(nr, addr);
else
__clear_bit(nr, addr);
}
include/asm-generic/bitops/non-atomic.h:
static inline void __set_bit(int nr, volatile unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
*p |= mask;
}
include/linux/bits.h:
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
Looks like native endianness to me.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-02 13:21 ` Lukas Wunner
2018-09-03 4:31 ` Matthew Wilcox
@ 2018-09-03 15:07 ` Geert Uytterhoeven
2018-09-04 15:29 ` kbuild test robot
2018-09-05 6:46 ` kbuild test robot
4 siblings, 0 replies; 75+ messages in thread
From: Geert Uytterhoeven @ 2018-09-03 15:07 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
peter.korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski, Greg KH,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald, Jiri Slaby,
Willy Tarreau, open list:DOCUMENTATION
Hi Janusz,
On Sun, Sep 2, 2018 at 2:01 PM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> Most users of get/set array functions iterate consecutive bits of data,
> usually a single integer, while processing array of results obtained
> from, or building an array of values to be passed to those functions.
> Save time wasted on those iterations by changing the functions' API to
> accept bitmaps.
>
> All current users are updated as well.
>
> More benefits from the change are expected as soon as planned support
> for accepting/passing those bitmaps directly from/to respective GPIO
> chip callbacks if applicable is implemented.
>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
> Cc: Lukas Wunner <lukas@wunner.de>
> Cc: Peter Korsgaard <peter.korsgaard@barco.com>
> Cc: Peter Rosin <peda@axentia.se>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Rojhalat Ibrahim <imr@rtschenk.de>
> Cc: Dominik Brodowski <linux@dominikbrodowski.net>
> Cc: Russell King <rmk+kernel@armlinux.org.uk>
> Cc: Kishon Vijay Abraham I <kishon@ti.com>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: Lars-Peter Clausen <lars@metafoo.de>
> Cc: Michael Hennerich <Michael.Hennerich@analog.com>
> Cc: Jonathan Cameron <jic23@kernel.org>
> Cc: Hartmut Knaack <knaack.h@gmx.de>
> Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Jiri Slaby <jslaby@suse.com>
> Cc: Yegor Yefremov <yegorslists@googlemail.com>
> Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
> --- a/drivers/auxdisplay/hd44780.c
> +++ b/drivers/auxdisplay/hd44780.c
> @@ -62,17 +62,12 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
> /* write to an LCD panel register in 8 bit GPIO mode */
> static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
> {
> - int values[10]; /* for DATA[0-7], RS, RW */
> - unsigned int i, n;
> -
> - for (i = 0; i < 8; i++)
> - values[PIN_DATA0 + i] = !!(val & BIT(i));
> - values[PIN_CTRL_RS] = rs;
> - n = 9;
> - if (hd->pins[PIN_CTRL_RW]) {
> - values[PIN_CTRL_RW] = 0;
> - n++;
> - }
> + DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
> + unsigned int n;
> +
> + *values = val;
Given DECLARE_BITMAP() creates an array, the above line looks a bit funny now.
IMHO, either you use
unsigned long values;
values = val;
__assign_bit(8, &values, rs);
or
DECLARE_BITMAP(values, 10);
values[0] = val;
__assign_bit(8, values, rs);
Nevertheless, for hd44780.c:
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions
2018-09-02 12:01 ` [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-03 14:21 ` Geert Uytterhoeven
@ 2018-09-04 15:23 ` kbuild test robot
2018-09-05 7:11 ` kbuild test robot
2 siblings, 0 replies; 75+ messages in thread
From: kbuild test robot @ 2018-09-04 15:23 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio, Linus Walleij,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Tony Lindgren,
Lukas Wunner, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King
[-- Attachment #1: Type: text/plain, Size: 27248 bytes --]
Hi Janusz,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on gpio/for-next]
[also build test WARNING on v4.19-rc2 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Janusz-Krzysztofik/gpiolib-Pass-bitmaps-not-integer-arrays-to-get-set-array/20180903-172834
base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
reproduce: make htmldocs
:::::: branch date: 8 hours ago
:::::: commit date: 8 hours ago
All warnings (new ones prefixed by >>):
WARNING: convert(1) not found, for SVG to PDF conversion install ImageMagick (https://www.imagemagick.org)
include/linux/srcu.h:175: warning: Function parameter or member 'p' not described in 'srcu_dereference_notrace'
include/linux/srcu.h:175: warning: Function parameter or member 'sp' not described in 'srcu_dereference_notrace'
include/linux/gfp.h:1: warning: no structured comments found
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ibss' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.connect' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.keys' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ie' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ie_len' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.bssid' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ssid' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.default_key' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.default_mgmt_key' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.prev_bssid_valid' not described in 'wireless_dev'
include/net/mac80211.h:2328: warning: Function parameter or member 'radiotap_timestamp.units_pos' not described in 'ieee80211_hw'
include/net/mac80211.h:2328: warning: Function parameter or member 'radiotap_timestamp.accuracy' not described in 'ieee80211_hw'
include/net/mac80211.h:977: warning: Function parameter or member 'control.rates' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.rts_cts_rate_idx' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.use_rts' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.use_cts_prot' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.short_preamble' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.skip_table' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.jiffies' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.vif' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.hw_key' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.flags' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.enqueue_time' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'ack' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'ack.cookie' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.rates' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.ack_signal' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.ampdu_ack_len' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.ampdu_len' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.antenna' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.tx_time' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.is_valid_ack_signal' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.status_driver_data' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'driver_rates' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'pad' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'rate_driver_data' not described in 'ieee80211_tx_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg.signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg.chain_signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.filtered' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.retry_failed' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.retry_count' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.lost_packets' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_tdls_pkt_time' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.msdu_retries' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.msdu_failed' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_ack' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_ack_signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.ack_signal_filled' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.avg_ack_signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.packets' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.bytes' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.last_rate' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.msdu' not described in 'sta_info'
include/linux/mod_devicetable.h:763: warning: Function parameter or member 'driver_data' not described in 'typec_device_id'
kernel/sched/fair.c:3371: warning: Function parameter or member 'flags' not described in 'attach_entity_load_avg'
arch/x86/include/asm/atomic.h:84: warning: Excess function parameter 'i' description in 'arch_atomic_sub_and_test'
arch/x86/include/asm/atomic.h:84: warning: Excess function parameter 'v' description in 'arch_atomic_sub_and_test'
arch/x86/include/asm/atomic.h:96: warning: Excess function parameter 'v' description in 'arch_atomic_inc'
arch/x86/include/asm/atomic.h:109: warning: Excess function parameter 'v' description in 'arch_atomic_dec'
arch/x86/include/asm/atomic.h:124: warning: Excess function parameter 'v' description in 'arch_atomic_dec_and_test'
arch/x86/include/asm/atomic.h:138: warning: Excess function parameter 'v' description in 'arch_atomic_inc_and_test'
arch/x86/include/asm/atomic.h:153: warning: Excess function parameter 'i' description in 'arch_atomic_add_negative'
arch/x86/include/asm/atomic.h:153: warning: Excess function parameter 'v' description in 'arch_atomic_add_negative'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.cb' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.poll' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.active' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.cb' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.poll' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.active' not described in 'dma_buf'
include/linux/dma-fence-array.h:54: warning: Function parameter or member 'work' not described in 'dma_fence_array'
include/linux/gpio/driver.h:142: warning: Function parameter or member 'request_key' not described in 'gpio_irq_chip'
>> drivers/gpio/gpiolib.c:2917: warning: Function parameter or member 'array_info' not described in 'gpiod_get_raw_array_value'
>> drivers/gpio/gpiolib.c:2942: warning: Function parameter or member 'array_info' not described in 'gpiod_get_array_value'
drivers/gpio/gpiolib.c:2942: warning: Function parameter or member 'value_bitmap' not described in 'gpiod_get_array_value'
drivers/gpio/gpiolib.c:2942: warning: Excess function parameter 'value_bitnap' description in 'gpiod_get_array_value'
>> drivers/gpio/gpiolib.c:3180: warning: Function parameter or member 'array_info' not described in 'gpiod_set_raw_array_value'
>> drivers/gpio/gpiolib.c:3204: warning: Function parameter or member 'array_info' not described in 'gpiod_set_array_value'
>> drivers/gpio/gpiolib.c:3442: warning: Function parameter or member 'array_info' not described in 'gpiod_get_raw_array_value_cansleep'
>> drivers/gpio/gpiolib.c:3467: warning: Function parameter or member 'array_info' not described in 'gpiod_get_array_value_cansleep'
>> drivers/gpio/gpiolib.c:3528: warning: Function parameter or member 'array_info' not described in 'gpiod_set_raw_array_value_cansleep'
>> drivers/gpio/gpiolib.c:3569: warning: Function parameter or member 'array_info' not described in 'gpiod_set_array_value_cansleep'
include/linux/iio/hw-consumer.h:1: warning: no structured comments found
include/linux/input/sparse-keymap.h:46: warning: Function parameter or member 'sw' not described in 'key_entry'
drivers/pci/pci.c:218: warning: Excess function parameter 'p' description in 'pci_dev_str_match_path'
include/linux/regulator/driver.h:227: warning: Function parameter or member 'resume' not described in 'regulator_ops'
drivers/regulator/core.c:4479: warning: Excess function parameter 'state' description in 'regulator_suspend'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw0' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw1' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw2' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw3' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.eadm' not described in 'irb'
drivers/slimbus/stream.c:1: warning: no structured comments found
drivers/target/target_core_device.c:1: warning: no structured comments found
drivers/usb/dwc3/gadget.c:510: warning: Excess function parameter 'dwc' description in 'dwc3_gadget_start_config'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/bus.c:1: warning: no structured comments found
drivers/usb/typec/bus.c:268: warning: Function parameter or member 'mode' not described in 'typec_match_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1: warning: no structured comments found
include/linux/w1.h:281: warning: Function parameter or member 'of_match_table' not described in 'w1_family'
fs/direct-io.c:257: warning: Excess function parameter 'offset' description in 'dio_complete'
fs/file_table.c:1: warning: no structured comments found
fs/libfs.c:477: warning: Excess function parameter 'available' description in 'simple_write_end'
fs/posix_acl.c:646: warning: Function parameter or member 'inode' not described in 'posix_acl_update_mode'
fs/posix_acl.c:646: warning: Function parameter or member 'mode_p' not described in 'posix_acl_update_mode'
fs/posix_acl.c:646: warning: Function parameter or member 'acl' not described in 'posix_acl_update_mode'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:183: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_read_lock'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:254: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_gfx'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:302: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2986: warning: Excess function parameter 'dev' description in 'amdgpu_vm_get_task_info'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2987: warning: Function parameter or member 'adev' not described in 'amdgpu_vm_get_task_info'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2987: warning: Excess function parameter 'dev' description in 'amdgpu_vm_get_task_info'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_pin' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_unpin' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_res_obj' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_get_sg_table' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_import_sg_table' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_vmap' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_vunmap' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_mmap' not described in 'drm_driver'
include/drm/drm_panel.h:98: warning: Function parameter or member 'link' not described in 'drm_panel'
drivers/gpu/drm/i915/i915_vma.h:49: warning: cannot understand function prototype: 'struct i915_vma '
drivers/gpu/drm/i915/i915_vma.h:1: warning: no structured comments found
drivers/gpu/drm/i915/intel_guc_fwif.h:553: warning: cannot understand function prototype: 'struct guc_log_buffer_state '
drivers/gpu/drm/i915/i915_trace.h:1: warning: no structured comments found
include/linux/skbuff.h:860: warning: Function parameter or member 'dev_scratch' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'list' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'ip_defrag_offset' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'skb_mstamp' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member '__cloned_offset' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'head_frag' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member '__pkt_type_offset' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'encapsulation' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'encap_hdr_csum' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'csum_valid' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'csum_complete_sw' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'csum_level' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'inner_protocol_type' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'remcsum_offload' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'offload_fwd_mark' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'offload_mr_fwd_mark' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'sender_cpu' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'reserved_tailroom' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'inner_ipproto' not described in 'sk_buff'
include/net/sock.h:238: warning: Function parameter or member 'skc_addrpair' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_portpair' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_ipv6only' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_net_refcnt' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_v6_daddr' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_v6_rcv_saddr' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_cookie' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_listener' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_tw_dr' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_rcv_wnd' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_tw_rcv_nxt' not described in 'sock_common'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.rmem_alloc' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.len' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.head' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.tail' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_wq_raw' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'tcp_rtx_queue' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_route_forced_caps' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_txtime_report_errors' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_validate_xmit_skb' not described in 'sock'
include/linux/netdevice.h:2018: warning: Function parameter or member 'adj_list.upper' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'adj_list.lower' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'gso_partial_features' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'switchdev_ops' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'l3mdev_ops' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'xfrmdev_ops' not described in 'net_device'
# https://github.com/0day-ci/linux/commit/dea6937cb6f545e86b0d5bc4c7e31be802de175d
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout dea6937cb6f545e86b0d5bc4c7e31be802de175d
vim +2917 drivers/gpio/gpiolib.c
d2876d08 David Brownell 2008-02-04 2898
eec1d566 Lukas Wunner 2017-10-12 2899 /**
eec1d566 Lukas Wunner 2017-10-12 2900 * gpiod_get_raw_array_value() - read raw values from an array of GPIOs
916010a7 Janusz Krzysztofik 2018-09-02 2901 * @array_size: number of elements in the descriptor array / value bitmap
eec1d566 Lukas Wunner 2017-10-12 2902 * @desc_array: array of GPIO descriptors whose values will be read
916010a7 Janusz Krzysztofik 2018-09-02 2903 * @value_bitmap: bitmap to store the read values
eec1d566 Lukas Wunner 2017-10-12 2904 *
eec1d566 Lukas Wunner 2017-10-12 2905 * Read the raw values of the GPIOs, i.e. the values of the physical lines
eec1d566 Lukas Wunner 2017-10-12 2906 * without regard for their ACTIVE_LOW status. Return 0 in case of success,
eec1d566 Lukas Wunner 2017-10-12 2907 * else an error code.
eec1d566 Lukas Wunner 2017-10-12 2908 *
eec1d566 Lukas Wunner 2017-10-12 2909 * This function should be called from contexts where we cannot sleep,
eec1d566 Lukas Wunner 2017-10-12 2910 * and it will complain if the GPIO chip functions potentially sleep.
eec1d566 Lukas Wunner 2017-10-12 2911 */
eec1d566 Lukas Wunner 2017-10-12 2912 int gpiod_get_raw_array_value(unsigned int array_size,
916010a7 Janusz Krzysztofik 2018-09-02 2913 struct gpio_desc **desc_array,
dea6937c Janusz Krzysztofik 2018-09-02 2914 struct gpio_array *array_info,
916010a7 Janusz Krzysztofik 2018-09-02 2915 unsigned long *value_bitmap)
eec1d566 Lukas Wunner 2017-10-12 2916 {
eec1d566 Lukas Wunner 2017-10-12 @2917 if (!desc_array)
eec1d566 Lukas Wunner 2017-10-12 2918 return -EINVAL;
eec1d566 Lukas Wunner 2017-10-12 2919 return gpiod_get_array_value_complex(true, false, array_size,
dea6937c Janusz Krzysztofik 2018-09-02 2920 desc_array, array_info,
dea6937c Janusz Krzysztofik 2018-09-02 2921 value_bitmap);
eec1d566 Lukas Wunner 2017-10-12 2922 }
eec1d566 Lukas Wunner 2017-10-12 2923 EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
eec1d566 Lukas Wunner 2017-10-12 2924
eec1d566 Lukas Wunner 2017-10-12 2925 /**
eec1d566 Lukas Wunner 2017-10-12 2926 * gpiod_get_array_value() - read values from an array of GPIOs
916010a7 Janusz Krzysztofik 2018-09-02 2927 * @array_size: number of elements in the descriptor array / value bitmap
eec1d566 Lukas Wunner 2017-10-12 2928 * @desc_array: array of GPIO descriptors whose values will be read
916010a7 Janusz Krzysztofik 2018-09-02 2929 * @value_bitnap: bitmap to store the read values
eec1d566 Lukas Wunner 2017-10-12 2930 *
eec1d566 Lukas Wunner 2017-10-12 2931 * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
eec1d566 Lukas Wunner 2017-10-12 2932 * into account. Return 0 in case of success, else an error code.
eec1d566 Lukas Wunner 2017-10-12 2933 *
eec1d566 Lukas Wunner 2017-10-12 2934 * This function should be called from contexts where we cannot sleep,
eec1d566 Lukas Wunner 2017-10-12 2935 * and it will complain if the GPIO chip functions potentially sleep.
eec1d566 Lukas Wunner 2017-10-12 2936 */
eec1d566 Lukas Wunner 2017-10-12 2937 int gpiod_get_array_value(unsigned int array_size,
916010a7 Janusz Krzysztofik 2018-09-02 2938 struct gpio_desc **desc_array,
dea6937c Janusz Krzysztofik 2018-09-02 2939 struct gpio_array *array_info,
916010a7 Janusz Krzysztofik 2018-09-02 2940 unsigned long *value_bitmap)
eec1d566 Lukas Wunner 2017-10-12 2941 {
eec1d566 Lukas Wunner 2017-10-12 @2942 if (!desc_array)
eec1d566 Lukas Wunner 2017-10-12 2943 return -EINVAL;
eec1d566 Lukas Wunner 2017-10-12 2944 return gpiod_get_array_value_complex(false, false, array_size,
dea6937c Janusz Krzysztofik 2018-09-02 2945 desc_array, array_info,
dea6937c Janusz Krzysztofik 2018-09-02 2946 value_bitmap);
eec1d566 Lukas Wunner 2017-10-12 2947 }
eec1d566 Lukas Wunner 2017-10-12 2948 EXPORT_SYMBOL_GPL(gpiod_get_array_value);
eec1d566 Lukas Wunner 2017-10-12 2949
:::::: The code at line 2917 was first introduced by commit
:::::: eec1d566cdf94b57e8f5ba9fe60eea214929bcfc gpio: Introduce ->get_multiple callback
:::::: TO: Lukas Wunner <lukas@wunner.de>
:::::: CC: Linus Walleij <linus.walleij@linaro.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 6587 bytes --]
[-- Attachment #3: Type: text/plain, Size: 169 bytes --]
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v6 3/4] gpiolib: Pass array info to get/set array functions
2018-08-31 22:56 ` [PATCH v6 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
@ 2018-09-04 15:27 ` kbuild test robot
0 siblings, 0 replies; 75+ messages in thread
From: kbuild test robot @ 2018-09-04 15:27 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: kbuild-all, Linus Walleij, Andrew Lunn, Ulf Hansson, linux-doc,
linux-iio, Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Geert Uytterhoeven,
linux-serial, Jiri Slaby, Michael Hennerich, linux-gpio,
Lars-Peter Clausen
[-- Attachment #1: Type: text/plain, Size: 4096 bytes --]
Hi Janusz,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on gpio/for-next]
[also build test ERROR on v4.19-rc2 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Janusz-Krzysztofik/gpiolib-speed-up-GPIO-array-processing/20180903-174241
base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
config: arm-cns3420vb_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=arm
:::::: branch date: 6 hours ago
:::::: commit date: 6 hours ago
All errors (new ones prefixed by >>):
drivers/mmc/core/pwrseq_simple.c: In function 'mmc_pwrseq_simple_set_gpios_value':
drivers/mmc/core/pwrseq_simple.c:49:13: error: passing argument 3 of 'gpiod_set_array_value_cansleep' from incompatible pointer type [-Werror=incompatible-pointer-types]
reset_gpios->info, value_bitmap);
^~~~~~~~~~~
In file included from drivers/mmc/core/pwrseq_simple.c:18:0:
include/linux/gpio/consumer.h:417:20: note: expected 'int *' but argument is of type 'struct gpio_array *'
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/mmc/core/pwrseq_simple.c:48:3: error: too many arguments to function 'gpiod_set_array_value_cansleep'
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/mmc/core/pwrseq_simple.c:18:0:
include/linux/gpio/consumer.h:417:20: note: declared here
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
# https://github.com/0day-ci/linux/commit/2313edb413de154774fb6a3431f5f135f9c78180
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 2313edb413de154774fb6a3431f5f135f9c78180
vim +/gpiod_set_array_value_cansleep +48 drivers/mmc/core/pwrseq_simple.c
5b96fea73 Srinivas Kandagatla 2016-04-14 36
934f1f483 Javier Martinez Canillas 2015-01-29 37 static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
934f1f483 Javier Martinez Canillas 2015-01-29 38 int value)
934f1f483 Javier Martinez Canillas 2015-01-29 39 {
ce0372758 Javier Martinez Canillas 2015-09-21 40 struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
64a67d476 Martin Fuzzey 2016-01-20 41
64a67d476 Martin Fuzzey 2016-01-20 42 if (!IS_ERR(reset_gpios)) {
486e66613 Tobin C. Harding 2018-03-26 43 int nvalues = reset_gpios->ndescs;
00db98568 Janusz Krzysztofik 2018-09-01 44 DECLARE_BITMAP(value_bitmap, nvalues);
934f1f483 Javier Martinez Canillas 2015-01-29 45
00db98568 Janusz Krzysztofik 2018-09-01 46 *value_bitmap = value;
486e66613 Tobin C. Harding 2018-03-26 47
00db98568 Janusz Krzysztofik 2018-09-01 @48 gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
2313edb41 Janusz Krzysztofik 2018-09-01 @49 reset_gpios->info, value_bitmap);
64a67d476 Martin Fuzzey 2016-01-20 50 }
934f1f483 Javier Martinez Canillas 2015-01-29 51 }
934f1f483 Javier Martinez Canillas 2015-01-29 52
:::::: The code at line 48 was first introduced by commit
:::::: 00db98568b73a7b04c5120e5b87934c7355cc015 gpiolib: Pass bitmaps, not integer arrays, to get/set array
:::::: TO: Janusz Krzysztofik <jmkrzyszt@gmail.com>
:::::: CC: 0day robot <lkp@intel.com>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 9623 bytes --]
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-01 0:23 ` Peter Rosin
@ 2018-09-04 15:28 ` kbuild test robot
2018-09-04 15:28 ` kbuild test robot
2 siblings, 0 replies; 75+ messages in thread
From: kbuild test robot @ 2018-09-04 15:28 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: kbuild-all, Linus Walleij, Jonathan Corbet,
Miguel Ojeda Sandonis, Peter Korsgaard, Peter Rosin, Ulf Hansson,
Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby, Willy
Hi Janusz,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on gpio/for-next]
[also build test WARNING on v4.19-rc2 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Janusz-Krzysztofik/gpiolib-speed-up-GPIO-array-processing/20180903-174241
base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
:::::: branch date: 9 hours ago
:::::: commit date: 9 hours ago
>> drivers/mux/gpio.c:25:9: sparse: Variable length array is used.
--
>> drivers/i2c/muxes/i2c-mux-gpio.c:29:9: sparse: Variable length array is used.
include/linux/device.h:685:13: sparse: undefined identifier '__builtin_mul_overflow'
include/linux/device.h:685:13: sparse: not a function <noident>
include/linux/device.h:685:13: sparse: call with no type!
# https://github.com/0day-ci/linux/commit/00db98568b73a7b04c5120e5b87934c7355cc015
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 00db98568b73a7b04c5120e5b87934c7355cc015
vim +25 drivers/mux/gpio.c
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 21
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 22 static int mux_gpio_set(struct mux_control *mux, int state)
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 23 {
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 24 struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
00db98568 drivers/mux/gpio.c Janusz Krzysztofik 2018-09-01 @25 DECLARE_BITMAP(value_bitmap, mux_gpio->gpios->ndescs);
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 26
00db98568 drivers/mux/gpio.c Janusz Krzysztofik 2018-09-01 27 *value_bitmap = state;
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 28
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 29 gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
00db98568 drivers/mux/gpio.c Janusz Krzysztofik 2018-09-01 30 mux_gpio->gpios->desc, value_bitmap);
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 31
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 32 return 0;
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 33 }
2c089f08e drivers/mux/mux-gpio.c Peter Rosin 2017-05-14 34
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-01 0:23 ` Peter Rosin
2018-09-04 15:28 ` kbuild test robot
@ 2018-09-04 15:28 ` kbuild test robot
2 siblings, 0 replies; 75+ messages in thread
From: kbuild test robot @ 2018-09-04 15:28 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio, Linus Walleij,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, Geert Uytterhoeven,
linux-serial, Jiri Slaby, Michael Hennerich, linux-gpio,
Lars-Peter Clausen, Greg Kroah-Hartman, linux-mmc, linux-kernel,
Willy Tarreau, Miguel
[-- Attachment #1: Type: text/plain, Size: 3328 bytes --]
Hi Janusz,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on gpio/for-next]
[also build test ERROR on v4.19-rc2 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Janusz-Krzysztofik/gpiolib-speed-up-GPIO-array-processing/20180903-174241
base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
config: arm-cns3420vb_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=arm
:::::: branch date: 5 hours ago
:::::: commit date: 5 hours ago
All errors (new ones prefixed by >>):
drivers/mmc/core/pwrseq_simple.c: In function 'mmc_pwrseq_simple_set_gpios_value':
>> drivers/mmc/core/pwrseq_simple.c:49:13: error: passing argument 3 of 'gpiod_set_array_value_cansleep' from incompatible pointer type [-Werror=incompatible-pointer-types]
value_bitmap);
^~~~~~~~~~~~
In file included from drivers/mmc/core/pwrseq_simple.c:18:0:
include/linux/gpio/consumer.h:400:20: note: expected 'int *' but argument is of type 'long unsigned int *'
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
# https://github.com/0day-ci/linux/commit/00db98568b73a7b04c5120e5b87934c7355cc015
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 00db98568b73a7b04c5120e5b87934c7355cc015
vim +/gpiod_set_array_value_cansleep +49 drivers/mmc/core/pwrseq_simple.c
5b96fea73 Srinivas Kandagatla 2016-04-14 36
934f1f483 Javier Martinez Canillas 2015-01-29 37 static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
934f1f483 Javier Martinez Canillas 2015-01-29 38 int value)
934f1f483 Javier Martinez Canillas 2015-01-29 39 {
ce0372758 Javier Martinez Canillas 2015-09-21 40 struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
64a67d476 Martin Fuzzey 2016-01-20 41
64a67d476 Martin Fuzzey 2016-01-20 42 if (!IS_ERR(reset_gpios)) {
486e66613 Tobin C. Harding 2018-03-26 43 int nvalues = reset_gpios->ndescs;
00db98568 Janusz Krzysztofik 2018-09-01 44 DECLARE_BITMAP(value_bitmap, nvalues);
934f1f483 Javier Martinez Canillas 2015-01-29 45
00db98568 Janusz Krzysztofik 2018-09-01 46 *value_bitmap = value;
486e66613 Tobin C. Harding 2018-03-26 47
00db98568 Janusz Krzysztofik 2018-09-01 48 gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
00db98568 Janusz Krzysztofik 2018-09-01 @49 value_bitmap);
64a67d476 Martin Fuzzey 2016-01-20 50 }
934f1f483 Javier Martinez Canillas 2015-01-29 51 }
934f1f483 Javier Martinez Canillas 2015-01-29 52
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 9623 bytes --]
[-- Attachment #3: Type: text/plain, Size: 169 bytes --]
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (2 preceding siblings ...)
2018-09-03 15:07 ` Geert Uytterhoeven
@ 2018-09-04 15:29 ` kbuild test robot
2018-09-05 6:46 ` kbuild test robot
4 siblings, 0 replies; 75+ messages in thread
From: kbuild test robot @ 2018-09-04 15:29 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: kbuild-all, Linus Walleij, Jonathan Corbet,
Miguel Ojeda Sandonis, Peter Korsgaard, Peter Rosin, Ulf Hansson,
Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby, Willy
[-- Attachment #1: Type: text/plain, Size: 23765 bytes --]
Hi Janusz,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on gpio/for-next]
[also build test WARNING on v4.19-rc2 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Janusz-Krzysztofik/gpiolib-Pass-bitmaps-not-integer-arrays-to-get-set-array/20180903-172834
base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
reproduce: make htmldocs
:::::: branch date: 5 hours ago
:::::: commit date: 5 hours ago
All warnings (new ones prefixed by >>):
WARNING: convert(1) not found, for SVG to PDF conversion install ImageMagick (https://www.imagemagick.org)
include/linux/srcu.h:175: warning: Function parameter or member 'p' not described in 'srcu_dereference_notrace'
include/linux/srcu.h:175: warning: Function parameter or member 'sp' not described in 'srcu_dereference_notrace'
include/linux/gfp.h:1: warning: no structured comments found
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ibss' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.connect' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.keys' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ie' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ie_len' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.bssid' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ssid' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.default_key' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.default_mgmt_key' not described in 'wireless_dev'
include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.prev_bssid_valid' not described in 'wireless_dev'
include/net/mac80211.h:2328: warning: Function parameter or member 'radiotap_timestamp.units_pos' not described in 'ieee80211_hw'
include/net/mac80211.h:2328: warning: Function parameter or member 'radiotap_timestamp.accuracy' not described in 'ieee80211_hw'
include/net/mac80211.h:977: warning: Function parameter or member 'control.rates' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.rts_cts_rate_idx' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.use_rts' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.use_cts_prot' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.short_preamble' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.skip_table' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.jiffies' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.vif' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.hw_key' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.flags' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'control.enqueue_time' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'ack' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'ack.cookie' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.rates' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.ack_signal' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.ampdu_ack_len' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.ampdu_len' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.antenna' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.tx_time' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.is_valid_ack_signal' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'status.status_driver_data' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'driver_rates' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'pad' not described in 'ieee80211_tx_info'
include/net/mac80211.h:977: warning: Function parameter or member 'rate_driver_data' not described in 'ieee80211_tx_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg.signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg.chain_signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.filtered' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.retry_failed' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.retry_count' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.lost_packets' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_tdls_pkt_time' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.msdu_retries' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.msdu_failed' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_ack' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_ack_signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.ack_signal_filled' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.avg_ack_signal' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.packets' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.bytes' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.last_rate' not described in 'sta_info'
net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.msdu' not described in 'sta_info'
include/linux/mod_devicetable.h:763: warning: Function parameter or member 'driver_data' not described in 'typec_device_id'
kernel/sched/fair.c:3371: warning: Function parameter or member 'flags' not described in 'attach_entity_load_avg'
arch/x86/include/asm/atomic.h:84: warning: Excess function parameter 'i' description in 'arch_atomic_sub_and_test'
arch/x86/include/asm/atomic.h:84: warning: Excess function parameter 'v' description in 'arch_atomic_sub_and_test'
arch/x86/include/asm/atomic.h:96: warning: Excess function parameter 'v' description in 'arch_atomic_inc'
arch/x86/include/asm/atomic.h:109: warning: Excess function parameter 'v' description in 'arch_atomic_dec'
arch/x86/include/asm/atomic.h:124: warning: Excess function parameter 'v' description in 'arch_atomic_dec_and_test'
arch/x86/include/asm/atomic.h:138: warning: Excess function parameter 'v' description in 'arch_atomic_inc_and_test'
arch/x86/include/asm/atomic.h:153: warning: Excess function parameter 'i' description in 'arch_atomic_add_negative'
arch/x86/include/asm/atomic.h:153: warning: Excess function parameter 'v' description in 'arch_atomic_add_negative'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.cb' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.poll' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.active' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.cb' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.poll' not described in 'dma_buf'
include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.active' not described in 'dma_buf'
include/linux/dma-fence-array.h:54: warning: Function parameter or member 'work' not described in 'dma_fence_array'
include/linux/gpio/driver.h:142: warning: Function parameter or member 'request_key' not described in 'gpio_irq_chip'
>> drivers/gpio/gpiolib.c:2936: warning: Function parameter or member 'value_bitmap' not described in 'gpiod_get_array_value'
drivers/gpio/gpiolib.c:2936: warning: Excess function parameter 'value_bitnap' description in 'gpiod_get_array_value'
include/linux/iio/hw-consumer.h:1: warning: no structured comments found
include/linux/input/sparse-keymap.h:46: warning: Function parameter or member 'sw' not described in 'key_entry'
drivers/pci/pci.c:218: warning: Excess function parameter 'p' description in 'pci_dev_str_match_path'
include/linux/regulator/driver.h:227: warning: Function parameter or member 'resume' not described in 'regulator_ops'
drivers/regulator/core.c:4479: warning: Excess function parameter 'state' description in 'regulator_suspend'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw0' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw1' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw2' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw3' not described in 'irb'
arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.eadm' not described in 'irb'
drivers/slimbus/stream.c:1: warning: no structured comments found
drivers/target/target_core_device.c:1: warning: no structured comments found
drivers/usb/dwc3/gadget.c:510: warning: Excess function parameter 'dwc' description in 'dwc3_gadget_start_config'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/bus.c:1: warning: no structured comments found
drivers/usb/typec/bus.c:268: warning: Function parameter or member 'mode' not described in 'typec_match_altmode'
drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
drivers/usb/typec/class.c:1: warning: no structured comments found
include/linux/w1.h:281: warning: Function parameter or member 'of_match_table' not described in 'w1_family'
fs/direct-io.c:257: warning: Excess function parameter 'offset' description in 'dio_complete'
fs/file_table.c:1: warning: no structured comments found
fs/libfs.c:477: warning: Excess function parameter 'available' description in 'simple_write_end'
fs/posix_acl.c:646: warning: Function parameter or member 'inode' not described in 'posix_acl_update_mode'
fs/posix_acl.c:646: warning: Function parameter or member 'mode_p' not described in 'posix_acl_update_mode'
fs/posix_acl.c:646: warning: Function parameter or member 'acl' not described in 'posix_acl_update_mode'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:183: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_read_lock'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:254: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_gfx'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:302: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2986: warning: Excess function parameter 'dev' description in 'amdgpu_vm_get_task_info'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2987: warning: Function parameter or member 'adev' not described in 'amdgpu_vm_get_task_info'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2987: warning: Excess function parameter 'dev' description in 'amdgpu_vm_get_task_info'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_pin' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_unpin' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_res_obj' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_get_sg_table' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_import_sg_table' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_vmap' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_vunmap' not described in 'drm_driver'
include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_mmap' not described in 'drm_driver'
include/drm/drm_panel.h:98: warning: Function parameter or member 'link' not described in 'drm_panel'
drivers/gpu/drm/i915/i915_vma.h:49: warning: cannot understand function prototype: 'struct i915_vma '
drivers/gpu/drm/i915/i915_vma.h:1: warning: no structured comments found
drivers/gpu/drm/i915/intel_guc_fwif.h:553: warning: cannot understand function prototype: 'struct guc_log_buffer_state '
drivers/gpu/drm/i915/i915_trace.h:1: warning: no structured comments found
include/linux/skbuff.h:860: warning: Function parameter or member 'dev_scratch' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'list' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'ip_defrag_offset' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'skb_mstamp' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member '__cloned_offset' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'head_frag' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member '__pkt_type_offset' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'encapsulation' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'encap_hdr_csum' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'csum_valid' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'csum_complete_sw' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'csum_level' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'inner_protocol_type' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'remcsum_offload' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'offload_fwd_mark' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'offload_mr_fwd_mark' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'sender_cpu' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'reserved_tailroom' not described in 'sk_buff'
include/linux/skbuff.h:860: warning: Function parameter or member 'inner_ipproto' not described in 'sk_buff'
include/net/sock.h:238: warning: Function parameter or member 'skc_addrpair' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_portpair' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_ipv6only' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_net_refcnt' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_v6_daddr' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_v6_rcv_saddr' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_cookie' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_listener' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_tw_dr' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_rcv_wnd' not described in 'sock_common'
include/net/sock.h:238: warning: Function parameter or member 'skc_tw_rcv_nxt' not described in 'sock_common'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.rmem_alloc' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.len' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.head' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.tail' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_wq_raw' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'tcp_rtx_queue' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_route_forced_caps' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_txtime_report_errors' not described in 'sock'
include/net/sock.h:509: warning: Function parameter or member 'sk_validate_xmit_skb' not described in 'sock'
include/linux/netdevice.h:2018: warning: Function parameter or member 'adj_list.upper' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'adj_list.lower' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'gso_partial_features' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'switchdev_ops' not described in 'net_device'
include/linux/netdevice.h:2018: warning: Function parameter or member 'l3mdev_ops' not described in 'net_device'
# https://github.com/0day-ci/linux/commit/916010a7343fd0931103acedebff6835ed3314f0
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 916010a7343fd0931103acedebff6835ed3314f0
vim +2936 drivers/gpio/gpiolib.c
eec1d566 Lukas Wunner 2017-10-12 2919
eec1d566 Lukas Wunner 2017-10-12 2920 /**
eec1d566 Lukas Wunner 2017-10-12 2921 * gpiod_get_array_value() - read values from an array of GPIOs
916010a7 Janusz Krzysztofik 2018-09-02 2922 * @array_size: number of elements in the descriptor array / value bitmap
eec1d566 Lukas Wunner 2017-10-12 2923 * @desc_array: array of GPIO descriptors whose values will be read
916010a7 Janusz Krzysztofik 2018-09-02 2924 * @value_bitnap: bitmap to store the read values
eec1d566 Lukas Wunner 2017-10-12 2925 *
eec1d566 Lukas Wunner 2017-10-12 2926 * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
eec1d566 Lukas Wunner 2017-10-12 2927 * into account. Return 0 in case of success, else an error code.
eec1d566 Lukas Wunner 2017-10-12 2928 *
eec1d566 Lukas Wunner 2017-10-12 2929 * This function should be called from contexts where we cannot sleep,
eec1d566 Lukas Wunner 2017-10-12 2930 * and it will complain if the GPIO chip functions potentially sleep.
eec1d566 Lukas Wunner 2017-10-12 2931 */
eec1d566 Lukas Wunner 2017-10-12 2932 int gpiod_get_array_value(unsigned int array_size,
916010a7 Janusz Krzysztofik 2018-09-02 2933 struct gpio_desc **desc_array,
916010a7 Janusz Krzysztofik 2018-09-02 2934 unsigned long *value_bitmap)
eec1d566 Lukas Wunner 2017-10-12 2935 {
eec1d566 Lukas Wunner 2017-10-12 @2936 if (!desc_array)
eec1d566 Lukas Wunner 2017-10-12 2937 return -EINVAL;
eec1d566 Lukas Wunner 2017-10-12 2938 return gpiod_get_array_value_complex(false, false, array_size,
916010a7 Janusz Krzysztofik 2018-09-02 2939 desc_array, value_bitmap);
eec1d566 Lukas Wunner 2017-10-12 2940 }
eec1d566 Lukas Wunner 2017-10-12 2941 EXPORT_SYMBOL_GPL(gpiod_get_array_value);
eec1d566 Lukas Wunner 2017-10-12 2942
:::::: The code at line 2936 was first introduced by commit
:::::: eec1d566cdf94b57e8f5ba9fe60eea214929bcfc gpio: Introduce ->get_multiple callback
:::::: TO: Lukas Wunner <lukas@wunner.de>
:::::: CC: Linus Walleij <linus.walleij@linaro.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 6587 bytes --]
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (3 preceding siblings ...)
2018-09-04 15:29 ` kbuild test robot
@ 2018-09-05 6:46 ` kbuild test robot
4 siblings, 0 replies; 75+ messages in thread
From: kbuild test robot @ 2018-09-05 6:46 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: kbuild-all, Linus Walleij, Jonathan Corbet,
Miguel Ojeda Sandonis, Peter Korsgaard, Peter Rosin, Ulf Hansson,
Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby, Willy
[-- Attachment #1: Type: text/plain, Size: 6171 bytes --]
Hi Janusz,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on gpio/for-next]
[also build test ERROR on v4.19-rc2 next-20180905]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Janusz-Krzysztofik/gpiolib-Pass-bitmaps-not-integer-arrays-to-get-set-array/20180903-172834
base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
config: x86_64-randconfig-f2-201835 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
drivers/phy/motorola/phy-mapphone-mdm6600.c: In function 'phy_mdm6600_cmd':
>> drivers/phy/motorola/phy-mapphone-mdm6600.c:165:36: error: passing argument 3 of 'gpiod_set_array_value_cansleep' from incompatible pointer type [-Werror=incompatible-pointer-types]
ddata->cmd_gpios->desc, values);
^~~~~~
In file included from drivers/phy/motorola/phy-mapphone-mdm6600.c:16:0:
include/linux/gpio/consumer.h:400:20: note: expected 'int *' but argument is of type 'long unsigned int *'
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/phy/motorola/phy-mapphone-mdm6600.c: In function 'phy_mdm6600_status':
>> drivers/phy/motorola/phy-mapphone-mdm6600.c:184:13: error: passing argument 3 of 'gpiod_get_array_value_cansleep' from incompatible pointer type [-Werror=incompatible-pointer-types]
values);
^~~~~~
In file included from drivers/phy/motorola/phy-mapphone-mdm6600.c:16:0:
include/linux/gpio/consumer.h:387:19: note: expected 'int *' but argument is of type 'long unsigned int *'
static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/gpiod_set_array_value_cansleep +165 drivers/phy/motorola/phy-mapphone-mdm6600.c
5d1ebbda0 Tony Lindgren 2018-03-08 151
5d1ebbda0 Tony Lindgren 2018-03-08 152 /**
5d1ebbda0 Tony Lindgren 2018-03-08 153 * phy_mdm6600_cmd() - send a command request to mdm6600
5d1ebbda0 Tony Lindgren 2018-03-08 154 * @ddata: device driver data
5d1ebbda0 Tony Lindgren 2018-03-08 155 *
5d1ebbda0 Tony Lindgren 2018-03-08 156 * Configures the three command request GPIOs to the specified value.
5d1ebbda0 Tony Lindgren 2018-03-08 157 */
5d1ebbda0 Tony Lindgren 2018-03-08 158 static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
5d1ebbda0 Tony Lindgren 2018-03-08 159 {
916010a73 Janusz Krzysztofik 2018-09-02 160 DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
5d1ebbda0 Tony Lindgren 2018-03-08 161
916010a73 Janusz Krzysztofik 2018-09-02 162 *values = val;
5d1ebbda0 Tony Lindgren 2018-03-08 163
5d1ebbda0 Tony Lindgren 2018-03-08 164 gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
5d1ebbda0 Tony Lindgren 2018-03-08 @165 ddata->cmd_gpios->desc, values);
5d1ebbda0 Tony Lindgren 2018-03-08 166 }
5d1ebbda0 Tony Lindgren 2018-03-08 167
5d1ebbda0 Tony Lindgren 2018-03-08 168 /**
5d1ebbda0 Tony Lindgren 2018-03-08 169 * phy_mdm6600_status() - read mdm6600 status lines
5d1ebbda0 Tony Lindgren 2018-03-08 170 * @ddata: device driver data
5d1ebbda0 Tony Lindgren 2018-03-08 171 */
5d1ebbda0 Tony Lindgren 2018-03-08 172 static void phy_mdm6600_status(struct work_struct *work)
5d1ebbda0 Tony Lindgren 2018-03-08 173 {
5d1ebbda0 Tony Lindgren 2018-03-08 174 struct phy_mdm6600 *ddata;
5d1ebbda0 Tony Lindgren 2018-03-08 175 struct device *dev;
916010a73 Janusz Krzysztofik 2018-09-02 176 DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
5d1ebbda0 Tony Lindgren 2018-03-08 177 int error, i, val = 0;
5d1ebbda0 Tony Lindgren 2018-03-08 178
5d1ebbda0 Tony Lindgren 2018-03-08 179 ddata = container_of(work, struct phy_mdm6600, status_work.work);
5d1ebbda0 Tony Lindgren 2018-03-08 180 dev = ddata->dev;
5d1ebbda0 Tony Lindgren 2018-03-08 181
ad5003300 Tony Lindgren 2018-05-31 182 error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
5d1ebbda0 Tony Lindgren 2018-03-08 183 ddata->status_gpios->desc,
5d1ebbda0 Tony Lindgren 2018-03-08 @184 values);
5d1ebbda0 Tony Lindgren 2018-03-08 185 if (error)
5d1ebbda0 Tony Lindgren 2018-03-08 186 return;
5d1ebbda0 Tony Lindgren 2018-03-08 187
ad5003300 Tony Lindgren 2018-05-31 188 for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
916010a73 Janusz Krzysztofik 2018-09-02 189 val |= test_bit(i, values) << i;
5d1ebbda0 Tony Lindgren 2018-03-08 190 dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
916010a73 Janusz Krzysztofik 2018-09-02 191 __func__, i, test_bit(i, values), val);
5d1ebbda0 Tony Lindgren 2018-03-08 192 }
5d1ebbda0 Tony Lindgren 2018-03-08 193 ddata->status = val;
5d1ebbda0 Tony Lindgren 2018-03-08 194
5d1ebbda0 Tony Lindgren 2018-03-08 195 dev_info(dev, "modem status: %i %s\n",
5d1ebbda0 Tony Lindgren 2018-03-08 196 ddata->status,
5d1ebbda0 Tony Lindgren 2018-03-08 197 phy_mdm6600_status_name[ddata->status & 7]);
5d1ebbda0 Tony Lindgren 2018-03-08 198 complete(&ddata->ack);
5d1ebbda0 Tony Lindgren 2018-03-08 199 }
5d1ebbda0 Tony Lindgren 2018-03-08 200
:::::: The code at line 165 was first introduced by commit
:::::: 5d1ebbda0318b1ba55eaa1fae3fd867af17b0774 phy: mapphone-mdm6600: Add USB PHY driver for MDM6600 on Droid 4
:::::: TO: Tony Lindgren <tony@atomide.com>
:::::: CC: Kishon Vijay Abraham I <kishon@ti.com>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 30605 bytes --]
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions
2018-09-02 12:01 ` [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-03 14:21 ` Geert Uytterhoeven
2018-09-04 15:23 ` kbuild test robot
@ 2018-09-05 7:11 ` kbuild test robot
2 siblings, 0 replies; 75+ messages in thread
From: kbuild test robot @ 2018-09-05 7:11 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: kbuild-all, Linus Walleij, Jonathan Corbet,
Miguel Ojeda Sandonis, Peter Korsgaard, Peter Rosin, Ulf Hansson,
Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg Kroah-Hartman, Kishon Vijay Abraham I,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald-Stadler, Jiri Slaby, Willy
[-- Attachment #1: Type: text/plain, Size: 7331 bytes --]
Hi Janusz,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on gpio/for-next]
[also build test ERROR on v4.19-rc2 next-20180905]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Janusz-Krzysztofik/gpiolib-Pass-bitmaps-not-integer-arrays-to-get-set-array/20180903-172834
base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
config: x86_64-randconfig-f2-201835 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
drivers/phy/motorola/phy-mapphone-mdm6600.c: In function 'phy_mdm6600_cmd':
drivers/phy/motorola/phy-mapphone-mdm6600.c:166:12: error: passing argument 3 of 'gpiod_set_array_value_cansleep' from incompatible pointer type [-Werror=incompatible-pointer-types]
ddata->cmd_gpios->info, values);
^~~~~
In file included from drivers/phy/motorola/phy-mapphone-mdm6600.c:16:0:
include/linux/gpio/consumer.h:417:20: note: expected 'int *' but argument is of type 'struct gpio_array *'
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/phy/motorola/phy-mapphone-mdm6600.c:164:2: error: too many arguments to function 'gpiod_set_array_value_cansleep'
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/phy/motorola/phy-mapphone-mdm6600.c:16:0:
include/linux/gpio/consumer.h:417:20: note: declared here
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/phy/motorola/phy-mapphone-mdm6600.c: In function 'phy_mdm6600_status':
drivers/phy/motorola/phy-mapphone-mdm6600.c:185:13: error: passing argument 3 of 'gpiod_get_array_value_cansleep' from incompatible pointer type [-Werror=incompatible-pointer-types]
ddata->status_gpios->info,
^~~~~
In file included from drivers/phy/motorola/phy-mapphone-mdm6600.c:16:0:
include/linux/gpio/consumer.h:404:19: note: expected 'int *' but argument is of type 'struct gpio_array *'
static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/phy/motorola/phy-mapphone-mdm6600.c:183:10: error: too many arguments to function 'gpiod_get_array_value_cansleep'
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/phy/motorola/phy-mapphone-mdm6600.c:16:0:
include/linux/gpio/consumer.h:404:19: note: declared here
static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/gpiod_set_array_value_cansleep +164 drivers/phy/motorola/phy-mapphone-mdm6600.c
5d1ebbda0 Tony Lindgren 2018-03-08 151
5d1ebbda0 Tony Lindgren 2018-03-08 152 /**
5d1ebbda0 Tony Lindgren 2018-03-08 153 * phy_mdm6600_cmd() - send a command request to mdm6600
5d1ebbda0 Tony Lindgren 2018-03-08 154 * @ddata: device driver data
5d1ebbda0 Tony Lindgren 2018-03-08 155 *
5d1ebbda0 Tony Lindgren 2018-03-08 156 * Configures the three command request GPIOs to the specified value.
5d1ebbda0 Tony Lindgren 2018-03-08 157 */
5d1ebbda0 Tony Lindgren 2018-03-08 158 static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
5d1ebbda0 Tony Lindgren 2018-03-08 159 {
916010a73 Janusz Krzysztofik 2018-09-02 160 DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
5d1ebbda0 Tony Lindgren 2018-03-08 161
916010a73 Janusz Krzysztofik 2018-09-02 162 *values = val;
5d1ebbda0 Tony Lindgren 2018-03-08 163
5d1ebbda0 Tony Lindgren 2018-03-08 @164 gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
dea6937cb Janusz Krzysztofik 2018-09-02 165 ddata->cmd_gpios->desc,
dea6937cb Janusz Krzysztofik 2018-09-02 @166 ddata->cmd_gpios->info, values);
5d1ebbda0 Tony Lindgren 2018-03-08 167 }
5d1ebbda0 Tony Lindgren 2018-03-08 168
5d1ebbda0 Tony Lindgren 2018-03-08 169 /**
5d1ebbda0 Tony Lindgren 2018-03-08 170 * phy_mdm6600_status() - read mdm6600 status lines
5d1ebbda0 Tony Lindgren 2018-03-08 171 * @ddata: device driver data
5d1ebbda0 Tony Lindgren 2018-03-08 172 */
5d1ebbda0 Tony Lindgren 2018-03-08 173 static void phy_mdm6600_status(struct work_struct *work)
5d1ebbda0 Tony Lindgren 2018-03-08 174 {
5d1ebbda0 Tony Lindgren 2018-03-08 175 struct phy_mdm6600 *ddata;
5d1ebbda0 Tony Lindgren 2018-03-08 176 struct device *dev;
916010a73 Janusz Krzysztofik 2018-09-02 177 DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
5d1ebbda0 Tony Lindgren 2018-03-08 178 int error, i, val = 0;
5d1ebbda0 Tony Lindgren 2018-03-08 179
5d1ebbda0 Tony Lindgren 2018-03-08 180 ddata = container_of(work, struct phy_mdm6600, status_work.work);
5d1ebbda0 Tony Lindgren 2018-03-08 181 dev = ddata->dev;
5d1ebbda0 Tony Lindgren 2018-03-08 182
ad5003300 Tony Lindgren 2018-05-31 @183 error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
5d1ebbda0 Tony Lindgren 2018-03-08 184 ddata->status_gpios->desc,
dea6937cb Janusz Krzysztofik 2018-09-02 @185 ddata->status_gpios->info,
5d1ebbda0 Tony Lindgren 2018-03-08 186 values);
5d1ebbda0 Tony Lindgren 2018-03-08 187 if (error)
5d1ebbda0 Tony Lindgren 2018-03-08 188 return;
5d1ebbda0 Tony Lindgren 2018-03-08 189
ad5003300 Tony Lindgren 2018-05-31 190 for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
916010a73 Janusz Krzysztofik 2018-09-02 191 val |= test_bit(i, values) << i;
5d1ebbda0 Tony Lindgren 2018-03-08 192 dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
916010a73 Janusz Krzysztofik 2018-09-02 193 __func__, i, test_bit(i, values), val);
5d1ebbda0 Tony Lindgren 2018-03-08 194 }
5d1ebbda0 Tony Lindgren 2018-03-08 195 ddata->status = val;
5d1ebbda0 Tony Lindgren 2018-03-08 196
5d1ebbda0 Tony Lindgren 2018-03-08 197 dev_info(dev, "modem status: %i %s\n",
5d1ebbda0 Tony Lindgren 2018-03-08 198 ddata->status,
5d1ebbda0 Tony Lindgren 2018-03-08 199 phy_mdm6600_status_name[ddata->status & 7]);
5d1ebbda0 Tony Lindgren 2018-03-08 200 complete(&ddata->ack);
5d1ebbda0 Tony Lindgren 2018-03-08 201 }
5d1ebbda0 Tony Lindgren 2018-03-08 202
:::::: The code at line 164 was first introduced by commit
:::::: 5d1ebbda0318b1ba55eaa1fae3fd867af17b0774 phy: mapphone-mdm6600: Add USB PHY driver for MDM6600 on Droid 4
:::::: TO: Tony Lindgren <tony@atomide.com>
:::::: CC: Kishon Vijay Abraham I <kishon@ti.com>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 30605 bytes --]
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH v8 0/4] gpiolib: speed up GPIO array processing
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (3 preceding siblings ...)
2018-09-02 12:01 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
@ 2018-09-05 21:50 ` Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
` (4 more replies)
4 siblings, 5 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-05 21:50 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
The goal is to boost performance of get/set array functions while
processing GPIO arrays which represent pins of a signle chip in
hardware order. If resulting performance is close to PIO, GPIO API
can be used for data I/O without much loss of speed.
Created and tested on a low end Amstrad Delta board with NAND driver
updated to use GPIO API for data I/O. Performance degrade compared to
PIO is much better than before the optimization though not quite
satisfactory on my test hardware.
Janusz Krzysztofik (4):
gpiolib: Pass bitmaps, not integer arrays, to get/set array
gpiolib: Identify arrays matching GPIO hardware
gpiolib: Pass array info to get/set array functions
gpiolib: Implement fast processing path in get/set array
Changelog:
v8:
[PATCH v8 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array:
- replace *values with values[0] where applicable - suggessted by Geert
Uytterhoeven, thanks,
- drop !! from 3rd argument of __assign_bit() where applicable - suggested
by Lukas Wunner, thanks,
drivers/gpio/gpiolib.c:
- s/bitnap/bitmap/ - catched by Lukas Wunner, thanks,
drivers/phy/motorola/phy-mapphone-mdm6600.c:
- assign ddata->status directly from bitmap, not an intermediate 'val'
variable, now used only for debugging purposes,
include/linux/gpio/consumer.h:
- also update API of inline function replacements used if CONFIG_GPIOLIB
is not defined - catched by kbuild test robot,
[PATCH v8 3/4] gpiolib: Pass array info to get/set array functions:
commit message:
- s/bulids/builds/ - catched by Geert Uytterhoeven, thanks,
drivers/gpio/gpiolib.c:
- add information on array_info arguments to array function descriptions -
catched by kbuild test robot,
include/linux/gpio/consumer.h:
- also update API of inline function replacements used if CONFIG_GPIOLIB
is not defined - catched by kbuild test robot.
v7:
- add more people to Cc: - authors and/or those who contributed most to
the drivers in scope of the change,
[PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set:
- avoid VLAs, use data source type bit number as bitmap size if not
constant - great recommendation by Peter Rosin, thanks,
- revert names of local variables declared with DECLARE_BITMAP() from
'value_bitmap' to original names of value arrays they replace (but not
'value_array') - inspired by Peter Rosin suggestion - thanks!
drivers/gpio/gpio-max3191x.c:
- use bitmap_alloc() to be more consistent with DECLARE_BITMAP() pattern
used by other consumers,
drivers/phy/motorola/phy-mapphone-mdm6600.c:
- no need to mask unused bits of val before its assignment to bitmap,
passing PHY_MDM6600_NR_CMD_LINES to gpiod_set_array_value() as array/
bitmap size provides sufficient protection.
v6:
[PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set
- use DECLARE_BITMAP() macro for declaring value_bitmap - great idea by
David Laight, thanks!
drivers/auxdisplay/hd44780.c:
- simplify the code and adjust comments as recommended by Geert
Uytterhoeven - thanks!,
drivers/i2c/muxes/i2c-mux-gpio.c:
- drop .values member of struct gpiomux - details provided by Peter
Rosin, thanks!,
drivers/mux/gpio.c:
- drop .val member of struct mux_gpio - details provided by Peter
Rosin, thanks!,
drivers/net/phy/mdio-mux-gpio.c:
- drop .values member of struct mdio_mux_gpio_state and its processsing.
v5:
[PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set
- drivers/i2c/muxes/i2c-mux-gpio.c:
- drop assigment of values to struct gpiomux.values, as recommended
by Peter Rosin - thanks!,
- mark the .values member of the structure as obsolete,
- drivers/mux/gpio.c:
- drop assigment of values to struct mux_gpio.val, also recommended
by Peter Rosin - thanks!,
- merk the .val member of the structure as obsolete,
- drivers/auxdisplay/hd44780.c:
- fix incorrect bitmap size,
- use >>= operator to simplify notation,
both catched by Miguel Ojeda - thanks!,
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware
- add Cc: clause.
[PATCH v5 3/4] gpiolib: Pass array info to get/set array functions
- add Cc: clauses as well as Acked-by: collected so far.
[PATCH v5 4/4] gpiolib: Implement fast processing path in get/set
- add Cc: clause.
v4:
That series was a follow up of the former "mtd: rawnand: ams-delta: Use
gpio-omap accessors for data I/O" which already contained some changes
to gpiolib. Those previous attempts were commented by Borris Brezillon
who suggested using GPIO API modified to accept bitmaps, and by Linus
Walleij who suggested still more great ideas for further immprovement
of the proposed API changes - thanks!
diffstat:
Documentation/driver-api/gpio/board.rst | 15 +
Documentation/driver-api/gpio/consumer.rst | 48 +++-
drivers/auxdisplay/hd44780.c | 67 ++----
drivers/bus/ts-nbus.c | 20 -
drivers/gpio/gpio-max3191x.c | 16 -
drivers/gpio/gpiolib.c | 281 ++++++++++++++++++++++------
drivers/gpio/gpiolib.h | 15 +
drivers/i2c/muxes/i2c-mux-gpio.c | 16 -
drivers/mmc/core/pwrseq_simple.c | 15 -
drivers/mux/gpio.c | 16 -
drivers/net/phy/mdio-mux-gpio.c | 13 -
drivers/pcmcia/soc_common.c | 9
drivers/phy/motorola/phy-mapphone-mdm6600.c | 19 -
drivers/staging/iio/adc/ad7606.c | 12 -
drivers/tty/serial/serial_mctrl_gpio.c | 9
include/linux/gpio/consumer.h | 59 ++++-
16 files changed, 420 insertions(+), 210 deletions(-)
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH v8 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
@ 2018-09-05 21:50 ` Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
` (3 subsequent siblings)
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-05 21:50 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, Tony Lindgren,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, linux-iio,
Peter Korsgaard, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King, Lars-Peter Clausen
Most users of get/set array functions iterate consecutive bits of data,
usually a single integer, while processing array of results obtained
from, or building an array of values to be passed to those functions.
Save time wasted on those iterations by changing the functions' API to
accept bitmaps.
All current users are updated as well.
More benefits from the change are expected as soon as planned support
for accepting/passing those bitmaps directly from/to respective GPIO
chip callbacks if applicable is implemented.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Documentation/driver-api/gpio/consumer.rst | 22 ++++----
drivers/auxdisplay/hd44780.c | 59 +++++++--------------
drivers/bus/ts-nbus.c | 15 ++----
drivers/gpio/gpio-max3191x.c | 10 ++--
drivers/gpio/gpiolib.c | 82 +++++++++++++++--------------
drivers/gpio/gpiolib.h | 4 +-
drivers/i2c/muxes/i2c-mux-gpio.c | 13 ++---
drivers/mmc/core/pwrseq_simple.c | 13 ++---
drivers/mux/gpio.c | 13 ++---
drivers/net/phy/mdio-mux-gpio.c | 11 ++--
drivers/pcmcia/soc_common.c | 7 +--
drivers/phy/motorola/phy-mapphone-mdm6600.c | 15 +++---
drivers/staging/iio/adc/ad7606.c | 9 ++--
drivers/tty/serial/serial_mctrl_gpio.c | 7 +--
include/linux/gpio/consumer.h | 34 ++++++------
15 files changed, 137 insertions(+), 177 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index aa03f389d41d..ed68042ddccf 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -323,29 +323,29 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
GPIOs belonging to the same bank or chip simultaneously if supported by the
@@ -356,8 +356,8 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
- * value_array - an array to store the GPIOs' values (get) or
- an array of values to assign to the GPIOs (set)
+ * value_bitmap - a bitmap to store the GPIOs' values (get) or
+ a bitmap of values to assign to the GPIOs (set)
The descriptor array can be obtained using the gpiod_get_array() function
or one of its variants. If the group of descriptors returned by that function
@@ -366,7 +366,7 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_values);
+ my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index f1a42f0f1ded..e9a893384362 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -62,17 +62,12 @@ static void hd44780_strobe_gpio(struct hd44780 *hd)
/* write to an LCD panel register in 8 bit GPIO mode */
static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW */
- unsigned int i, n;
-
- for (i = 0; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
- n = 9;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
+ unsigned int n;
+
+ values[0] = val;
+ __assign_bit(8, values, rs);
+ n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
/* Present the data to the port */
gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
@@ -83,32 +78,25 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
/* write to an LCD panel register in 4 bit GPIO mode */
static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
- unsigned int i, n;
+ DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
+ unsigned int n;
/* High nibble + RS, RW */
- for (i = 4; i < 8; i++)
- values[PIN_DATA0 + i] = !!(val & BIT(i));
- values[PIN_CTRL_RS] = rs;
- n = 5;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ values[0] = val >> 4;
+ __assign_bit(4, values, rs);
+ n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
hd44780_strobe_gpio(hd);
/* Low nibble */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(val & BIT(i));
+ values[0] &= ~0x0fUL;
+ values[0] |= val & 0x0f;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
hd44780_strobe_gpio(hd);
}
@@ -155,23 +143,16 @@ static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)
/* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
{
- int values[10]; /* for DATA[0-7], RS, RW, but DATA[0-3] is unused */
+ DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
struct hd44780 *hd = lcd->drvdata;
- unsigned int i, n;
+ unsigned int n;
/* Command nibble + RS, RW */
- for (i = 0; i < 4; i++)
- values[PIN_DATA4 + i] = !!(cmd & BIT(i));
- values[PIN_CTRL_RS] = 0;
- n = 5;
- if (hd->pins[PIN_CTRL_RW]) {
- values[PIN_CTRL_RW] = 0;
- n++;
- }
+ values[0] = cmd & 0x0f;
+ n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4],
- &values[PIN_DATA4]);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 073fd9011154..8dde7c77f62c 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -110,11 +110,9 @@ static void ts_nbus_set_direction(struct ts_nbus *ts_nbus, int direction)
*/
static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
{
- int i;
- int values[8];
+ DECLARE_BITMAP(values, 8);
- for (i = 0; i < 8; i++)
- values[i] = 0;
+ values[0] = 0;
gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
@@ -157,14 +155,9 @@ static int ts_nbus_read_byte(struct ts_nbus *ts_nbus, u8 *val)
static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
{
struct gpio_descs *gpios = ts_nbus->data;
- int i;
- int values[8];
+ DECLARE_BITMAP(values, 8);
- for (i = 0; i < 8; i++)
- if (byte & BIT(i))
- values[i] = 1;
- else
- values[i] = 0;
+ values[0] = byte;
gpiod_set_array_value_cansleep(8, gpios->desc, values);
}
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index b5b9cb1fda50..bd4a245fc5a0 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -315,14 +315,16 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
int value)
{
- int i, *values;
+ unsigned long *values;
- values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
+ values = bitmap_alloc(ndescs, GFP_KERNEL);
if (!values)
return;
- for (i = 0; i < ndescs; i++)
- values[i] = value;
+ if (value)
+ bitmap_fill(values, ndescs);
+ else
+ bitmap_zero(values, ndescs);
gpiod_set_array_value_cansleep(ndescs, desc, values);
kfree(values);
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8f8a1999393..b66b2191c5c5 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -427,7 +427,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
struct linehandle_state *lh = filep->private_data;
void __user *ip = (void __user *)arg;
struct gpiohandle_data ghd;
- int vals[GPIOHANDLES_MAX];
+ DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
int i;
if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
@@ -442,7 +442,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
memset(&ghd, 0, sizeof(ghd));
for (i = 0; i < lh->numdescs; i++)
- ghd.values[i] = vals[i];
+ ghd.values[i] = test_bit(i, vals);
if (copy_to_user(ip, &ghd, sizeof(ghd)))
return -EFAULT;
@@ -461,7 +461,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
/* Clamp all values to [0,1] */
for (i = 0; i < lh->numdescs; i++)
- vals[i] = !!ghd.values[i];
+ __assign_bit(i, vals, ghd.values[i]);
/* Reuse the array setting function */
return gpiod_set_array_value_complex(false,
@@ -2784,7 +2784,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -2835,7 +2835,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
- value_array[j] = value;
+ __assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
}
@@ -2895,9 +2895,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
/**
* gpiod_get_raw_array_value() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -2907,20 +2907,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
/**
* gpiod_get_array_value() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -2929,12 +2930,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
* and it will complain if the GPIO chip functions potentially sleep.
*/
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3027,7 +3029,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
int i = 0;
@@ -3056,7 +3058,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
do {
struct gpio_desc *desc = desc_array[i];
int hwgpio = gpio_chip_hwgpio(desc);
- int value = value_array[i];
+ int value = test_bit(i, value_bitmap);
if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
@@ -3152,9 +3154,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
/**
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3163,20 +3165,21 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
* complain if the GPIO chip functions potentially sleep.
*/
int gpiod_set_raw_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
/**
* gpiod_set_array_value() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3185,12 +3188,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
* complain if the GPIO chip functions potentially sleep.
*/
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array)
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3410,9 +3414,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
/**
* gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status. Return 0 in case of success,
@@ -3422,21 +3426,21 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
/**
* gpiod_get_array_value_cansleep() - read values from an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
- * @value_array: array to store the read values
+ * @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account. Return 0 in case of success, else an error code.
@@ -3445,13 +3449,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_array);
+ desc_array, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3493,9 +3497,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
/**
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
* without regard for their ACTIVE_LOW status.
@@ -3504,13 +3508,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3533,9 +3537,9 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
/**
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
- * @array_size: number of elements in the descriptor / value arrays
+ * @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
- * @value_array: array of values to assign
+ * @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
* into account.
@@ -3544,13 +3548,13 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_array);
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index a7e49fef73d4..11e83d2eef89 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -187,11 +187,11 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 401308e3d036..d835857bb094 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -22,18 +22,15 @@ struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
struct gpio_desc **gpios;
- int *values;
};
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
- int i;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(val));
- for (i = 0; i < mux->data.n_gpios; i++)
- mux->values[i] = (val >> i) & 1;
+ values[0] = val;
- gpiod_set_array_value_cansleep(mux->data.n_gpios,
- mux->gpios, mux->values);
+ gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, values);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@@ -182,15 +179,13 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
- mux->data.n_gpios * sizeof(*mux->gpios) +
- mux->data.n_gpios * sizeof(*mux->values), 0,
+ mux->data.n_gpios * sizeof(*mux->gpios), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
goto alloc_failed;
}
mux->gpios = muxc->priv;
- mux->values = (int *)(mux->gpios + mux->data.n_gpios);
muxc->priv = mux;
platform_set_drvdata(pdev, muxc);
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index a8b9fee4d62a..902476ef9a0e 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -40,18 +40,13 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
if (!IS_ERR(reset_gpios)) {
- int i, *values;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(value));
int nvalues = reset_gpios->ndescs;
- values = kmalloc_array(nvalues, sizeof(int), GFP_KERNEL);
- if (!values)
- return;
+ values[0] = value;
- for (i = 0; i < nvalues; i++)
- values[i] = value;
-
- gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, values);
- kfree(values);
+ gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
+ values);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 6fdd9316db8b..46c44532fbd5 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -17,20 +17,17 @@
struct mux_gpio {
struct gpio_descs *gpios;
- int *val;
};
static int mux_gpio_set(struct mux_control *mux, int state)
{
struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
- int i;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(state));
- for (i = 0; i < mux_gpio->gpios->ndescs; i++)
- mux_gpio->val[i] = (state >> i) & 1;
+ values[0] = state;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc,
- mux_gpio->val);
+ mux_gpio->gpios->desc, values);
return 0;
}
@@ -58,13 +55,11 @@ static int mux_gpio_probe(struct platform_device *pdev)
if (pins < 0)
return pins;
- mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio) +
- pins * sizeof(*mux_gpio->val));
+ mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio));
if (IS_ERR(mux_chip))
return PTR_ERR(mux_chip);
mux_gpio = mux_chip_priv(mux_chip);
- mux_gpio->val = (int *)(mux_gpio + 1);
mux_chip->ops = &mux_gpio_ops;
mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index bc90764a8b8d..e25ccfc8c070 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -20,23 +20,21 @@
struct mdio_mux_gpio_state {
struct gpio_descs *gpios;
void *mux_handle;
- int values[];
};
static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
void *data)
{
struct mdio_mux_gpio_state *s = data;
- unsigned int n;
+ DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
if (current_child == desired_child)
return 0;
- for (n = 0; n < s->gpios->ndescs; n++)
- s->values[n] = (desired_child >> n) & 1;
+ values[0] = desired_child;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- s->values);
+ values);
return 0;
}
@@ -51,8 +49,7 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
if (IS_ERR(gpios))
return PTR_ERR(gpios);
- s = devm_kzalloc(&pdev->dev, struct_size(s, values, gpios->ndescs),
- GFP_KERNEL);
+ s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
if (!s) {
gpiod_put_array(gpios);
return -ENOMEM;
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index c5f2344c189b..ac033d555700 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -351,15 +351,16 @@ static int soc_common_pcmcia_config_skt(
if (ret == 0) {
struct gpio_desc *descs[2];
- int values[2], n = 0;
+ DECLARE_BITMAP(values, 2);
+ int n = 0;
if (skt->gpio_reset) {
descs[n] = skt->gpio_reset;
- values[n++] = !!(state->flags & SS_RESET);
+ __assign_bit(n++, values, state->flags & SS_RESET);
}
if (skt->gpio_bus_enable) {
descs[n] = skt->gpio_bus_enable;
- values[n++] = !!(state->flags & SS_OUTPUT_ENA);
+ __assign_bit(n++, values, state->flags & SS_OUTPUT_ENA);
}
if (n)
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 0075fb0bef8c..9162b61ddb95 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -157,12 +157,9 @@ static const struct phy_ops gpio_usb_ops = {
*/
static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
{
- int values[PHY_MDM6600_NR_CMD_LINES];
- int i;
+ DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
- val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
- for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
- values[i] = (val & BIT(i)) >> i;
+ values[0] = val;
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
ddata->cmd_gpios->desc, values);
@@ -176,7 +173,7 @@ static void phy_mdm6600_status(struct work_struct *work)
{
struct phy_mdm6600 *ddata;
struct device *dev;
- int values[PHY_MDM6600_NR_STATUS_LINES];
+ DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
int error, i, val = 0;
ddata = container_of(work, struct phy_mdm6600, status_work.work);
@@ -189,11 +186,11 @@ static void phy_mdm6600_status(struct work_struct *work)
return;
for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
- val |= values[i] << i;
+ val |= test_bit(i, values) << i;
dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
- __func__, i, values[i], val);
+ __func__, i, test_bit(i, values), val);
}
- ddata->status = val;
+ ddata->status = values[0];
dev_info(dev, "modem status: %i %s\n",
ddata->status,
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 25b9fcd5e3a4..9c1d77d48700 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -202,7 +202,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad7606_state *st = iio_priv(indio_dev);
- int values[3];
+ DECLARE_BITMAP(values, 3);
int ret, i;
switch (mask) {
@@ -227,13 +227,10 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
- values[0] = (ret >> 0) & 1;
- values[1] = (ret >> 1) & 1;
- values[2] = (ret >> 2) & 1;
+ values[0] = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- values);
+ gpiod_set_array_value(3, st->gpio_os->desc, values);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 1c06325beaca..7d9d2c7b6c39 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -40,7 +40,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
{
enum mctrl_gpio_idx i;
struct gpio_desc *desc_array[UART_GPIO_MAX];
- int value_array[UART_GPIO_MAX];
+ DECLARE_BITMAP(values, UART_GPIO_MAX);
unsigned int count = 0;
if (gpios == NULL)
@@ -49,10 +49,11 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
for (i = 0; i < UART_GPIO_MAX; i++)
if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
desc_array[count] = gpios->gpio[i];
- value_array[count] = !!(mctrl & mctrl_gpios_desc[i].mctrl);
+ __assign_bit(count, values,
+ mctrl & mctrl_gpios_desc[i].mctrl);
count++;
}
- gpiod_set_array_value(count, desc_array, value_array);
+ gpiod_set_array_value(count, desc_array, values);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 21ddbe440030..2b0389f0bec4 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -104,36 +104,38 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
/* Value get/set from non-sleeping context */
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
- struct gpio_desc **desc_array, int *value_array);
+ struct gpio_desc **desc_array,
+ unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array);
+ unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
@@ -330,7 +332,7 @@ static inline int gpiod_get_value(const struct gpio_desc *desc)
}
static inline int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@@ -343,7 +345,7 @@ static inline void gpiod_set_value(struct gpio_desc *desc, int value)
}
static inline void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@@ -356,7 +358,7 @@ static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
}
static inline int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@@ -369,7 +371,7 @@ static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
}
static inline int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@@ -384,7 +386,7 @@ static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
}
static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@@ -397,7 +399,7 @@ static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
}
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@@ -410,7 +412,7 @@ static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
}
static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
@@ -424,7 +426,7 @@ static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
}
static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
- int *value_array)
+ unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
WARN_ON(1);
--
2.16.4
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v8 2/4] gpiolib: Identify arrays matching GPIO hardware
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
@ 2018-09-05 21:50 ` Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
` (2 subsequent siblings)
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-05 21:50 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, Tony Lindgren,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Kishon Vijay Abraham I, linux-iio,
Peter Korsgaard, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King, Lars-Peter Clausen
Certain GPIO array lookup results may map directly to GPIO pins of a
single GPIO chip in hardware order. If that condition is recognized
and handled efficiently, significant performance gain of get/set array
functions may be possible.
While processing a request for an array of GPIO descriptors, identify
those which represent corresponding pins of a single GPIO chip. Skip
over pins which require open source or open drain special processing.
Moreover, identify pins which require inversion. Pass a pointer to
that information with the array to the caller so it can benefit from
enhanced performance as soon as get/set array functions can accept and
make efficient use of it.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/consumer.rst | 4 +-
drivers/gpio/gpiolib.c | 72 +++++++++++++++++++++++++++++-
drivers/gpio/gpiolib.h | 9 ++++
include/linux/gpio/consumer.h | 9 ++++
4 files changed, 92 insertions(+), 2 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index ed68042ddccf..7e0298b9a7b9 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -109,9 +109,11 @@ For a function using multiple GPIOs all of those can be obtained with one call::
enum gpiod_flags flags)
This function returns a struct gpio_descs which contains an array of
-descriptors::
+descriptors. It also contains a pointer to a gpiolib private structure which,
+if passed back to get/set array functions, may speed up I/O proocessing::
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index b66b2191c5c5..141f39308a53 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4174,7 +4174,9 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
{
struct gpio_desc *desc;
struct gpio_descs *descs;
- int count;
+ struct gpio_array *array_info = NULL;
+ struct gpio_chip *chip;
+ int count, bitmap_size;
count = gpiod_count(dev, con_id);
if (count < 0)
@@ -4190,9 +4192,77 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
gpiod_put_array(descs);
return ERR_CAST(desc);
}
+
descs->desc[descs->ndescs] = desc;
+
+ chip = gpiod_to_chip(desc);
+ /*
+ * Select a chip of first array member
+ * whose index matches its pin hardware number
+ * as a candidate for fast bitmap processing.
+ */
+ if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) {
+ struct gpio_descs *array;
+
+ bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
+ chip->ngpio : count);
+
+ array = kzalloc(struct_size(descs, desc, count) +
+ struct_size(array_info, invert_mask,
+ 3 * bitmap_size), GFP_KERNEL);
+ if (!array) {
+ gpiod_put_array(descs);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ memcpy(array, descs,
+ struct_size(descs, desc, descs->ndescs + 1));
+ kfree(descs);
+
+ descs = array;
+ array_info = (void *)(descs->desc + count);
+ array_info->get_mask = array_info->invert_mask +
+ bitmap_size;
+ array_info->set_mask = array_info->get_mask +
+ bitmap_size;
+
+ array_info->desc = descs->desc;
+ array_info->size = count;
+ array_info->chip = chip;
+ bitmap_set(array_info->get_mask, descs->ndescs,
+ count - descs->ndescs);
+ bitmap_set(array_info->set_mask, descs->ndescs,
+ count - descs->ndescs);
+ descs->info = array_info;
+ }
+ /*
+ * Unmark members which don't qualify for fast bitmap
+ * processing (different chip, not in hardware order)
+ */
+ if (array_info && (chip != array_info->chip ||
+ gpio_chip_hwgpio(desc) != descs->ndescs)) {
+ __clear_bit(descs->ndescs, array_info->get_mask);
+ __clear_bit(descs->ndescs, array_info->set_mask);
+ } else if (array_info) {
+ /* Exclude open drain or open source from fast output */
+ if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
+ gpiochip_line_is_open_source(chip, descs->ndescs))
+ __clear_bit(descs->ndescs,
+ array_info->set_mask);
+ /* Identify 'fast' pins which require invertion */
+ if (gpiod_is_active_low(desc))
+ __set_bit(descs->ndescs,
+ array_info->invert_mask);
+ }
+
descs->ndescs++;
}
+ if (array_info)
+ dev_dbg(dev,
+ "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n",
+ array_info->chip->label, array_info->size,
+ *array_info->get_mask, *array_info->set_mask,
+ *array_info->invert_mask);
return descs;
}
EXPORT_SYMBOL_GPL(gpiod_get_array);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 11e83d2eef89..b60905d558b1 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -183,6 +183,15 @@ static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
}
#endif
+struct gpio_array {
+ struct gpio_desc **desc;
+ unsigned int size;
+ struct gpio_chip *chip;
+ unsigned long *get_mask;
+ unsigned long *set_mask;
+ unsigned long invert_mask[];
+};
+
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 2b0389f0bec4..0ffd71c0a77c 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -17,11 +17,20 @@ struct device;
*/
struct gpio_desc;
+/**
+ * Opaque descriptor for a structure of GPIO array attributes. This structure
+ * is attached to struct gpiod_descs obtained from gpiod_get_array() and can be
+ * passed back to get/set array functions in order to activate fast processing
+ * path if applicable.
+ */
+struct gpio_array;
+
/**
* Struct containing an array of descriptors that can be obtained using
* gpiod_get_array().
*/
struct gpio_descs {
+ struct gpio_array *info;
unsigned int ndescs;
struct gpio_desc *desc[];
};
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v8 3/4] gpiolib: Pass array info to get/set array functions
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
@ 2018-09-05 21:50 ` Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-09-13 9:22 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Linus Walleij
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-05 21:50 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
In order to make use of array info obtained from gpiod_get_array() and
speed up processing of arrays matching single GPIO chip layout, that
information must be passed to get/set array functions. Extend the
functions' API with that additional parameter and update all users.
Pass NULL if a user builds an array itself from single GPIOs.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
---
Documentation/driver-api/gpio/consumer.rst | 14 ++++++++--
drivers/auxdisplay/hd44780.c | 8 +++---
drivers/bus/ts-nbus.c | 5 ++--
drivers/gpio/gpio-max3191x.c | 6 +++--
drivers/gpio/gpiolib.c | 40 +++++++++++++++++++++++------
drivers/gpio/gpiolib.h | 2 ++
drivers/i2c/muxes/i2c-mux-gpio.c | 3 ++-
drivers/mmc/core/pwrseq_simple.c | 2 +-
drivers/mux/gpio.c | 3 ++-
drivers/net/phy/mdio-mux-gpio.c | 2 +-
drivers/pcmcia/soc_common.c | 2 +-
drivers/phy/motorola/phy-mapphone-mdm6600.c | 4 ++-
drivers/staging/iio/adc/ad7606.c | 3 ++-
drivers/tty/serial/serial_mctrl_gpio.c | 2 +-
include/linux/gpio/consumer.h | 16 ++++++++++++
15 files changed, 86 insertions(+), 26 deletions(-)
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 7e0298b9a7b9..0afd95a12b10 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -325,28 +325,36 @@ The following functions get or set the values of an array of GPIOs::
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
The array can be an arbitrary set of GPIOs. The functions will try to access
@@ -358,6 +366,7 @@ accessed sequentially.
The functions take three arguments:
* array_size - the number of array elements
* desc_array - an array of GPIO descriptors
+ * array_info - optional information obtained from gpiod_array_get()
* value_bitmap - a bitmap to store the GPIOs' values (get) or
a bitmap of values to assign to the GPIOs (set)
@@ -368,12 +377,13 @@ the struct gpio_descs returned by gpiod_get_array()::
struct gpio_descs *my_gpio_descs = gpiod_get_array(...);
gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
- my_gpio_value_bitmap);
+ my_gpio_descs->info, my_gpio_value_bitmap);
It is also possible to access a completely arbitrary array of descriptors. The
descriptors may be obtained using any combination of gpiod_get() and
gpiod_get_array(). Afterwards the array of descriptors has to be setup
-manually before it can be passed to one of the above functions.
+manually before it can be passed to one of the above functions. In that case,
+array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index e9a893384362..9ad93ea42fdc 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -70,7 +70,7 @@ static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL, values);
hd44780_strobe_gpio(hd);
}
@@ -87,7 +87,7 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
@@ -96,7 +96,7 @@ static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
values[0] |= val & 0x0f;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
}
@@ -152,7 +152,7 @@ static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)
n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
/* Present the data to the port */
- gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], values);
+ gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
hd44780_strobe_gpio(hd);
}
diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 8dde7c77f62c..9989ce904a37 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -114,7 +114,8 @@ static void ts_nbus_reset_bus(struct ts_nbus *ts_nbus)
values[0] = 0;
- gpiod_set_array_value_cansleep(8, ts_nbus->data->desc, values);
+ gpiod_set_array_value_cansleep(8, ts_nbus->data->desc,
+ ts_nbus->data->info, values);
gpiod_set_value_cansleep(ts_nbus->csn, 0);
gpiod_set_value_cansleep(ts_nbus->strobe, 0);
gpiod_set_value_cansleep(ts_nbus->ale, 0);
@@ -159,7 +160,7 @@ static void ts_nbus_write_byte(struct ts_nbus *ts_nbus, u8 byte)
values[0] = byte;
- gpiod_set_array_value_cansleep(8, gpios->desc, values);
+ gpiod_set_array_value_cansleep(8, gpios->desc, gpios->info, values);
}
/*
diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
index bd4a245fc5a0..9a8876abeb57 100644
--- a/drivers/gpio/gpio-max3191x.c
+++ b/drivers/gpio/gpio-max3191x.c
@@ -313,6 +313,7 @@ static int max3191x_set_config(struct gpio_chip *gpio, unsigned int offset,
static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
struct gpio_desc **desc,
+ struct gpio_array *info,
int value)
{
unsigned long *values;
@@ -326,7 +327,7 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
else
bitmap_zero(values, ndescs);
- gpiod_set_array_value_cansleep(ndescs, desc, values);
+ gpiod_set_array_value_cansleep(ndescs, desc, info, values);
kfree(values);
}
@@ -399,7 +400,8 @@ static int max3191x_probe(struct spi_device *spi)
if (max3191x->modesel_pins)
gpiod_set_array_single_value_cansleep(
max3191x->modesel_pins->ndescs,
- max3191x->modesel_pins->desc, max3191x->mode);
+ max3191x->modesel_pins->desc,
+ max3191x->modesel_pins->info, max3191x->mode);
max3191x->ignore_uv = device_property_read_bool(dev,
"maxim,ignore-undervoltage");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 141f39308a53..cd7c1deed132 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -436,6 +436,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
+ NULL,
vals);
if (ret)
return ret;
@@ -468,6 +469,7 @@ static long linehandle_ioctl(struct file *filep, unsigned int cmd,
true,
lh->numdescs,
lh->descs,
+ NULL,
vals);
}
return -EINVAL;
@@ -2784,6 +2786,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -2897,6 +2900,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
* gpiod_get_raw_array_value() - read raw values from an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
@@ -2908,12 +2912,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_value);
*/
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
@@ -2921,6 +2927,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
* gpiod_get_array_value() - read values from an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
@@ -2931,12 +2938,14 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value);
*/
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value);
@@ -3029,6 +3038,7 @@ static void gpio_chip_set_multiple(struct gpio_chip *chip,
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
int i = 0;
@@ -3156,6 +3166,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
* gpiod_set_raw_array_value() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
@@ -3166,12 +3177,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_value);
*/
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, false, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
@@ -3179,6 +3191,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
* gpiod_set_array_value() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
@@ -3189,12 +3202,13 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
*/
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
if (!desc_array)
return;
gpiod_set_array_value_complex(false, false, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value);
@@ -3416,6 +3430,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
* gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the raw values of the GPIOs, i.e. the values of the physical lines
@@ -3426,13 +3441,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
*/
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(true, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
@@ -3440,6 +3457,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
* gpiod_get_array_value_cansleep() - read values from an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be read
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap to store the read values
*
* Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
@@ -3449,13 +3467,15 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep);
*/
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_get_array_value_complex(false, true, array_size,
- desc_array, value_bitmap);
+ desc_array, array_info,
+ value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep);
@@ -3499,6 +3519,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
* gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the raw values of the GPIOs, i.e. the values of the physical lines
@@ -3508,13 +3529,14 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
*/
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return -EINVAL;
return gpiod_set_array_value_complex(true, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
@@ -3539,6 +3561,7 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
* gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
* @array_size: number of elements in the descriptor array / value bitmap
* @desc_array: array of GPIO descriptors whose values will be assigned
+ * @array_info: information on applicability of fast bitmap processing path
* @value_bitmap: bitmap of values to assign
*
* Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status
@@ -3548,13 +3571,14 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n)
*/
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
might_sleep_if(extra_checks);
if (!desc_array)
return;
gpiod_set_array_value_complex(false, true, array_size, desc_array,
- value_bitmap);
+ array_info, value_bitmap);
}
EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index b60905d558b1..b65ca896b24d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -196,10 +196,12 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* This is just passed between gpiolib and devres */
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index d835857bb094..13882a2a4f60 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -30,7 +30,8 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
values[0] = val;
- gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, values);
+ gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, NULL,
+ values);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 902476ef9a0e..7f882a2bb872 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -46,7 +46,7 @@ static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
values[0] = value;
gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
- values);
+ reset_gpios->info, values);
}
}
diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 46c44532fbd5..02c1f2c014e8 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -27,7 +27,8 @@ static int mux_gpio_set(struct mux_control *mux, int state)
values[0] = state;
gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
- mux_gpio->gpios->desc, values);
+ mux_gpio->gpios->desc,
+ mux_gpio->gpios->info, values);
return 0;
}
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
index e25ccfc8c070..fe34576262bd 100644
--- a/drivers/net/phy/mdio-mux-gpio.c
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -34,7 +34,7 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
values[0] = desired_child;
gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
- values);
+ s->gpios->info, values);
return 0;
}
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index ac033d555700..3a8c84bb174d 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -364,7 +364,7 @@ static int soc_common_pcmcia_config_skt(
}
if (n)
- gpiod_set_array_value_cansleep(n, descs, values);
+ gpiod_set_array_value_cansleep(n, descs, NULL, values);
/*
* This really needs a better solution. The IRQ
diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 9162b61ddb95..25d456a323c2 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -162,7 +162,8 @@ static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
values[0] = val;
gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
- ddata->cmd_gpios->desc, values);
+ ddata->cmd_gpios->desc,
+ ddata->cmd_gpios->info, values);
}
/**
@@ -181,6 +182,7 @@ static void phy_mdm6600_status(struct work_struct *work)
error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
ddata->status_gpios->desc,
+ ddata->status_gpios->info,
values);
if (error)
return;
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 9c1d77d48700..b7810b1aad07 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -230,7 +230,8 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
values[0] = ret;
mutex_lock(&st->lock);
- gpiod_set_array_value(3, st->gpio_os->desc, values);
+ gpiod_set_array_value(3, st->gpio_os->desc, st->gpio_os->info,
+ values);
st->oversampling = val;
mutex_unlock(&st->lock);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 7d9d2c7b6c39..39ed56214cd3 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -53,7 +53,7 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
mctrl & mctrl_gpios_desc[i].mctrl);
count++;
}
- gpiod_set_array_value(count, desc_array, values);
+ gpiod_set_array_value(count, desc_array, NULL, values);
}
EXPORT_SYMBOL_GPL(mctrl_gpio_set);
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 0ffd71c0a77c..d7fbe30ece84 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -114,36 +114,44 @@ int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
int gpiod_get_value(const struct gpio_desc *desc);
int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value(struct gpio_desc *desc, int value);
void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value(const struct gpio_desc *desc);
int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
/* Value get/set from sleeping context */
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
@@ -341,6 +349,7 @@ static inline int gpiod_get_value(const struct gpio_desc *desc)
}
static inline int gpiod_get_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
@@ -354,6 +363,7 @@ static inline void gpiod_set_value(struct gpio_desc *desc, int value)
}
static inline void gpiod_set_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
@@ -367,6 +377,7 @@ static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
}
static inline int gpiod_get_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
@@ -380,6 +391,7 @@ static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
}
static inline int gpiod_set_raw_array_value(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
@@ -395,6 +407,7 @@ static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
}
static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
@@ -408,6 +421,7 @@ static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
}
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
@@ -421,6 +435,7 @@ static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
}
static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
@@ -435,6 +450,7 @@ static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
}
static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
struct gpio_desc **desc_array,
+ struct gpio_array *array_info,
unsigned long *value_bitmap)
{
/* GPIO can never have been requested */
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH v8 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (2 preceding siblings ...)
2018-09-05 21:50 ` [PATCH v8 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
@ 2018-09-05 21:50 ` Janusz Krzysztofik
2018-09-13 9:22 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Linus Walleij
4 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-05 21:50 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Certain GPIO descriptor arrays returned by gpio_get_array() may contain
information on direct mapping of array members to pins of a single GPIO
chip in hardware order. In such cases, bitmaps of values can be passed
directly from/to the chip's .get/set_multiple() callbacks without
wasting time on iterations.
Add respective code to gpiod_get/set_array_bitmap_complex() functions.
Pins not applicable for fast path are processed as before, skipping
over the 'fast' ones.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/board.rst | 15 ++++++
Documentation/driver-api/gpio/consumer.rst | 8 +++
drivers/gpio/gpiolib.c | 87 ++++++++++++++++++++++++++++--
3 files changed, 105 insertions(+), 5 deletions(-)
diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
index 2c112553df84..c66821e033c2 100644
--- a/Documentation/driver-api/gpio/board.rst
+++ b/Documentation/driver-api/gpio/board.rst
@@ -193,3 +193,18 @@ And the table can be added to the board code as follows::
The line will be hogged as soon as the gpiochip is created or - in case the
chip was created earlier - when the hog table is registered.
+
+Arrays of pins
+--------------
+In addition to requesting pins belonging to a function one by one, a device may
+also request an array of pins assigned to the function. The way those pins are
+mapped to the device determines if the array qualifies for fast bitmap
+processing. If yes, a bitmap is passed over get/set array functions directly
+between a caller and a respective .get/set_multiple() callback of a GPIO chip.
+
+In order to qualify for fast bitmap processing, the pin mapping must meet the
+following requirements:
+- it must belong to the same chip as other 'fast' pins of the function,
+- its index within the function must match its hardware number within the chip.
+
+Open drain and open source pins are excluded from fast bitmap output processing.
diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
index 0afd95a12b10..cf992e5ab976 100644
--- a/Documentation/driver-api/gpio/consumer.rst
+++ b/Documentation/driver-api/gpio/consumer.rst
@@ -388,6 +388,14 @@ array_info should be set to NULL.
Note that for optimal performance GPIOs belonging to the same chip should be
contiguous within the array of descriptors.
+Still better performance may be achieved if array indexes of the descriptors
+match hardware pin numbers of a single chip. If an array passed to a get/set
+array function matches the one obtained from gpiod_get_array() and array_info
+associated with the array is also passed, the function may take a fast bitmap
+processing path, passing the value_bitmap argument directly to the respective
+.get/set_multiple() callback of the chip. That allows for utilization of GPIO
+banks as data I/O ports without much loss of performance.
+
The return value of gpiod_get_array_value() and its variants is 0 on success
or negative on error. Note the difference to gpiod_get_value(), which returns
0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index cd7c1deed132..d7532aa6c0bc 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2789,7 +2789,36 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
struct gpio_array *array_info,
unsigned long *value_bitmap)
{
- int i = 0;
+ int err, i = 0;
+
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ err = gpio_chip_get_multiple(array_info->chip,
+ array_info->get_mask,
+ value_bitmap);
+ if (err)
+ return err;
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ if (bitmap_full(array_info->get_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->get_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
@@ -2820,7 +2849,12 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
__set_bit(hwgpio, mask);
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
@@ -2831,7 +2865,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
return ret;
}
- for (j = first; j < i; j++) {
+ for (j = first; j < i; ) {
const struct gpio_desc *desc = desc_array[j];
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(hwgpio, bits);
@@ -2840,6 +2874,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
value = !value;
__assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
+
+ if (array_info)
+ find_next_zero_bit(array_info->get_mask, i, j);
+ else
+ j++;
}
if (mask != fastpath)
@@ -3043,6 +3082,32 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
{
int i = 0;
+ /*
+ * Validate array_info against desc_array and its size.
+ * It should immediately follow desc_array if both
+ * have been obtained from the same gpiod_get_array() call.
+ */
+ if (array_info && array_info->desc == desc_array &&
+ array_size <= array_info->size &&
+ (void *)array_info == desc_array + array_info->size) {
+ if (!can_sleep)
+ WARN_ON(array_info->chip->can_sleep);
+
+ if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
+ bitmap_xor(value_bitmap, value_bitmap,
+ array_info->invert_mask, array_size);
+
+ gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
+ value_bitmap);
+
+ if (bitmap_full(array_info->set_mask, array_size))
+ return 0;
+
+ i = find_first_zero_bit(array_info->set_mask, array_size);
+ } else {
+ array_info = NULL;
+ }
+
while (i < array_size) {
struct gpio_chip *chip = desc_array[i]->gdev->chip;
unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
@@ -3070,7 +3135,14 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
int value = test_bit(i, value_bitmap);
- if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+ /*
+ * Pins applicable for fast input but not for
+ * fast output processing may have been already
+ * inverted inside the fast path, skip them.
+ */
+ if (!raw && !(array_info &&
+ test_bit(i, array_info->invert_mask)) &&
+ test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
trace_gpio_value(desc_to_gpio(desc), 0, value);
/*
@@ -3089,7 +3161,12 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
__clear_bit(hwgpio, bits);
count++;
}
- i++;
+
+ if (array_info)
+ find_next_zero_bit(array_info->set_mask,
+ array_size, i);
+ else
+ i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH v8 0/4] gpiolib: speed up GPIO array processing
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
` (3 preceding siblings ...)
2018-09-05 21:50 ` [PATCH v8 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
@ 2018-09-13 9:22 ` Linus Walleij
2018-09-19 18:08 ` Linus Walleij
4 siblings, 1 reply; 75+ messages in thread
From: Linus Walleij @ 2018-09-13 9:22 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg KH, kishon,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald, Jiri Slaby, Willy Tarreau,
Geert Uytterhoeven, Sebastien Bourdelin
On Wed, Sep 5, 2018 at 11:49 PM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> The goal is to boost performance of get/set array functions while
> processing GPIO arrays which represent pins of a signle chip in
> hardware order. If resulting performance is close to PIO, GPIO API
> can be used for data I/O without much loss of speed.
I applied the v8 to an immutable branch and pushed to kernelorg
so the build servers can churn it a bit, and if it works fine
then we can merge this into the devel branch and also set up
that as something other subsystems can pull in if they need it.
I'm really excited to merge this!
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v8 0/4] gpiolib: speed up GPIO array processing
2018-09-13 9:22 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Linus Walleij
@ 2018-09-19 18:08 ` Linus Walleij
0 siblings, 0 replies; 75+ messages in thread
From: Linus Walleij @ 2018-09-19 18:08 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg KH, kishon,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald, Jiri Slaby, Willy Tarreau,
Geert Uytterhoeven, Sebastien Bourdelin
On Thu, Sep 13, 2018 at 2:22 AM Linus Walleij <linus.walleij@linaro.org> wrote:
> On Wed, Sep 5, 2018 at 11:49 PM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
>
> > The goal is to boost performance of get/set array functions while
> > processing GPIO arrays which represent pins of a signle chip in
> > hardware order. If resulting performance is close to PIO, GPIO API
> > can be used for data I/O without much loss of speed.
>
> I applied the v8 to an immutable branch and pushed to kernelorg
> so the build servers can churn it a bit, and if it works fine
> then we can merge this into the devel branch and also set up
> that as something other subsystems can pull in if they need it.
>
> I'm really excited to merge this!
The branch built with no problems, and now I merged this into
devel. If that also builds fine, I will let it hit linux-next so we can
stabilize it for v4.20.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
[not found] ` <CGME20180920101151eucas1p221f5a1715b8556bb9d99bf08fe09ce6f@eucas1p2.samsung.com>
@ 2018-09-20 10:11 ` Marek Szyprowski
2018-09-20 15:48 ` Janusz Krzysztofik
2018-09-20 15:49 ` Linus Walleij
0 siblings, 2 replies; 75+ messages in thread
From: Marek Szyprowski @ 2018-09-20 10:11 UTC (permalink / raw)
To: Janusz Krzysztofik, Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Hi All,
On 2018-09-02 14:01, Janusz Krzysztofik wrote:
> Certain GPIO descriptor arrays returned by gpio_get_array() may contain
> information on direct mapping of array members to pins of a single GPIO
> chip in hardware order. In such cases, bitmaps of values can be passed
> directly from/to the chip's .get/set_multiple() callbacks without
> wasting time on iterations.
>
> Add respective code to gpiod_get/set_array_bitmap_complex() functions.
> Pins not applicable for fast path are processed as before, skipping
> over the 'fast' ones.
>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
I've just noticed that this patch landed in today's linux-next. Sadly it
breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
Booting hangs after detecting MMC cards. Reverting this patch fixes the
boot. I will try later to add some debugs and investigate it further what
really happens when booting hangs.
> ---
> Documentation/driver-api/gpio/board.rst | 15 ++++++
> Documentation/driver-api/gpio/consumer.rst | 8 +++
> drivers/gpio/gpiolib.c | 87 ++++++++++++++++++++++++++++--
> 3 files changed, 105 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
> index 2c112553df84..c66821e033c2 100644
> --- a/Documentation/driver-api/gpio/board.rst
> +++ b/Documentation/driver-api/gpio/board.rst
> @@ -193,3 +193,18 @@ And the table can be added to the board code as follows::
>
> The line will be hogged as soon as the gpiochip is created or - in case the
> chip was created earlier - when the hog table is registered.
> +
> +Arrays of pins
> +--------------
> +In addition to requesting pins belonging to a function one by one, a device may
> +also request an array of pins assigned to the function. The way those pins are
> +mapped to the device determines if the array qualifies for fast bitmap
> +processing. If yes, a bitmap is passed over get/set array functions directly
> +between a caller and a respective .get/set_multiple() callback of a GPIO chip.
> +
> +In order to qualify for fast bitmap processing, the pin mapping must meet the
> +following requirements:
> +- it must belong to the same chip as other 'fast' pins of the function,
> +- its index within the function must match its hardware number within the chip.
> +
> +Open drain and open source pins are excluded from fast bitmap output processing.
> diff --git a/Documentation/driver-api/gpio/consumer.rst b/Documentation/driver-api/gpio/consumer.rst
> index 0afd95a12b10..cf992e5ab976 100644
> --- a/Documentation/driver-api/gpio/consumer.rst
> +++ b/Documentation/driver-api/gpio/consumer.rst
> @@ -388,6 +388,14 @@ array_info should be set to NULL.
> Note that for optimal performance GPIOs belonging to the same chip should be
> contiguous within the array of descriptors.
>
> +Still better performance may be achieved if array indexes of the descriptors
> +match hardware pin numbers of a single chip. If an array passed to a get/set
> +array function matches the one obtained from gpiod_get_array() and array_info
> +associated with the array is also passed, the function may take a fast bitmap
> +processing path, passing the value_bitmap argument directly to the respective
> +.get/set_multiple() callback of the chip. That allows for utilization of GPIO
> +banks as data I/O ports without much loss of performance.
> +
> The return value of gpiod_get_array_value() and its variants is 0 on success
> or negative on error. Note the difference to gpiod_get_value(), which returns
> 0 or 1 on success to convey the GPIO value. With the array functions, the GPIO
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index cef6ee31fe05..b9d083fb13ee 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -2789,7 +2789,36 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> struct gpio_array *array_info,
> unsigned long *value_bitmap)
> {
> - int i = 0;
> + int err, i = 0;
> +
> + /*
> + * Validate array_info against desc_array and its size.
> + * It should immediately follow desc_array if both
> + * have been obtained from the same gpiod_get_array() call.
> + */
> + if (array_info && array_info->desc == desc_array &&
> + array_size <= array_info->size &&
> + (void *)array_info == desc_array + array_info->size) {
> + if (!can_sleep)
> + WARN_ON(array_info->chip->can_sleep);
> +
> + err = gpio_chip_get_multiple(array_info->chip,
> + array_info->get_mask,
> + value_bitmap);
> + if (err)
> + return err;
> +
> + if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
> + bitmap_xor(value_bitmap, value_bitmap,
> + array_info->invert_mask, array_size);
> +
> + if (bitmap_full(array_info->get_mask, array_size))
> + return 0;
> +
> + i = find_first_zero_bit(array_info->get_mask, array_size);
> + } else {
> + array_info = NULL;
> + }
>
> while (i < array_size) {
> struct gpio_chip *chip = desc_array[i]->gdev->chip;
> @@ -2820,7 +2849,12 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> int hwgpio = gpio_chip_hwgpio(desc);
>
> __set_bit(hwgpio, mask);
> - i++;
> +
> + if (array_info)
> + find_next_zero_bit(array_info->get_mask,
> + array_size, i);
> + else
> + i++;
> } while ((i < array_size) &&
> (desc_array[i]->gdev->chip == chip));
>
> @@ -2831,7 +2865,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> return ret;
> }
>
> - for (j = first; j < i; j++) {
> + for (j = first; j < i; ) {
> const struct gpio_desc *desc = desc_array[j];
> int hwgpio = gpio_chip_hwgpio(desc);
> int value = test_bit(hwgpio, bits);
> @@ -2840,6 +2874,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> value = !value;
> __assign_bit(j, value_bitmap, value);
> trace_gpio_value(desc_to_gpio(desc), 1, value);
> +
> + if (array_info)
> + find_next_zero_bit(array_info->get_mask, i, j);
> + else
> + j++;
> }
>
> if (mask != fastpath)
> @@ -3041,6 +3080,32 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
> {
> int i = 0;
>
> + /*
> + * Validate array_info against desc_array and its size.
> + * It should immediately follow desc_array if both
> + * have been obtained from the same gpiod_get_array() call.
> + */
> + if (array_info && array_info->desc == desc_array &&
> + array_size <= array_info->size &&
> + (void *)array_info == desc_array + array_info->size) {
> + if (!can_sleep)
> + WARN_ON(array_info->chip->can_sleep);
> +
> + if (!raw && !bitmap_empty(array_info->invert_mask, array_size))
> + bitmap_xor(value_bitmap, value_bitmap,
> + array_info->invert_mask, array_size);
> +
> + gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
> + value_bitmap);
> +
> + if (bitmap_full(array_info->set_mask, array_size))
> + return 0;
> +
> + i = find_first_zero_bit(array_info->set_mask, array_size);
> + } else {
> + array_info = NULL;
> + }
> +
> while (i < array_size) {
> struct gpio_chip *chip = desc_array[i]->gdev->chip;
> unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
> @@ -3068,7 +3133,14 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
> int hwgpio = gpio_chip_hwgpio(desc);
> int value = test_bit(i, value_bitmap);
>
> - if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags))
> + /*
> + * Pins applicable for fast input but not for
> + * fast output processing may have been already
> + * inverted inside the fast path, skip them.
> + */
> + if (!raw && !(array_info &&
> + test_bit(i, array_info->invert_mask)) &&
> + test_bit(FLAG_ACTIVE_LOW, &desc->flags))
> value = !value;
> trace_gpio_value(desc_to_gpio(desc), 0, value);
> /*
> @@ -3087,7 +3159,12 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
> __clear_bit(hwgpio, bits);
> count++;
> }
> - i++;
> +
> + if (array_info)
> + find_next_zero_bit(array_info->set_mask,
> + array_size, i);
> + else
> + i++;
> } while ((i < array_size) &&
> (desc_array[i]->gdev->chip == chip));
> /* push collected bits to outputs */
>
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-20 10:11 ` Marek Szyprowski
@ 2018-09-20 15:48 ` Janusz Krzysztofik
2018-09-20 16:21 ` Janusz Krzysztofik
2018-09-20 18:05 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Dan Carpenter
2018-09-20 15:49 ` Linus Walleij
1 sibling, 2 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-20 15:48 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski,
Greg Kroah-Hartman, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Jiri Slaby, Willy Tarreau
On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski wrote:
> Hi All,
>
> On 2018-09-02 14:01, Janusz Krzysztofik wrote:
> > Certain GPIO descriptor arrays returned by gpio_get_array() may contain
> > information on direct mapping of array members to pins of a single GPIO
> > chip in hardware order. In such cases, bitmaps of values can be passed
> > directly from/to the chip's .get/set_multiple() callbacks without
> > wasting time on iterations.
> >
> > Add respective code to gpiod_get/set_array_bitmap_complex() functions.
> > Pins not applicable for fast path are processed as before, skipping
> > over the 'fast' ones.
> >
> > Cc: Jonathan Corbet <corbet@lwn.net>
> > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>
> I've just noticed that this patch landed in today's linux-next. Sadly it
> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
>
> Booting hangs after detecting MMC cards. Reverting this patch fixes the
> boot. I will try later to add some debugs and investigate it further what
> really happens when booting hangs.
Hi Marek,
Thanks for reporting. Could you please try the following fix?
Thanks,
Janusz
>From d7ecd435bfb4972766b63ac383a43875700c7452 Mon Sep 17 00:00:00 2001
From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Date: Thu, 20 Sep 2018 17:37:21 +0200
Subject: [PATCH] gpiolib: Fix bitmap index not updated
While skipping fast path bits, bitmap index is not updated with next
found zero bit position. Fix it.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
drivers/gpio/gpiolib.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a53d17745d21..5bc3447949c9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
__set_bit(hwgpio, mask);
if (array_info)
- find_next_zero_bit(array_info->get_mask,
+ i = find_next_zero_bit(array_info->get_mask,
array_size, i);
else
i++;
@@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
trace_gpio_value(desc_to_gpio(desc), 1, value);
if (array_info)
- find_next_zero_bit(array_info->get_mask, i, j);
+ i = find_next_zero_bit(array_info->get_mask, i,
+ j);
else
j++;
}
@@ -3192,7 +3193,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
}
if (array_info)
- find_next_zero_bit(array_info->set_mask,
+ i = find_next_zero_bit(array_info->set_mask,
array_size, i);
else
i++;
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-20 10:11 ` Marek Szyprowski
2018-09-20 15:48 ` Janusz Krzysztofik
@ 2018-09-20 15:49 ` Linus Walleij
1 sibling, 0 replies; 75+ messages in thread
From: Linus Walleij @ 2018-09-20 15:49 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Janusz Krzysztofik, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski, Greg KH,
kishon, Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald, Jiri Slaby, Willy Tarreau,
Geert Uytterhoeven
On Thu, Sep 20, 2018 at 3:11 AM Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
> I've just noticed that this patch landed in today's linux-next. Sadly it
> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
Thanks for testing on this platform!
> Booting hangs after detecting MMC cards. Reverting this patch fixes the
> boot. I will try later to add some debugs and investigate it further what
> really happens when booting hangs.
How typical. I hope we can fix it, because this should mean speedups
for your platform.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-20 15:48 ` Janusz Krzysztofik
@ 2018-09-20 16:21 ` Janusz Krzysztofik
2018-09-21 8:18 ` Marek Szyprowski
2018-09-20 18:05 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Dan Carpenter
1 sibling, 1 reply; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-20 16:21 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio, Linus Walleij,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Krzysztof Kozlowski, Kishon Vijay Abraham I,
Tony Lindgren, Lukas Wunner, Geert Uytterhoeven, linux-serial,
Jiri Slaby, Michael Hennerich, Uwe Kleine-König, linux-gpio
On Thursday, September 20, 2018 5:48:22 PM CEST Janusz Krzysztofik wrote:
> On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski wrote:
> > Hi All,
> >
> > On 2018-09-02 14:01, Janusz Krzysztofik wrote:
> > > Certain GPIO descriptor arrays returned by gpio_get_array() may contain
> > > information on direct mapping of array members to pins of a single GPIO
> > > chip in hardware order. In such cases, bitmaps of values can be passed
> > > directly from/to the chip's .get/set_multiple() callbacks without
> > > wasting time on iterations.
> > >
> > > Add respective code to gpiod_get/set_array_bitmap_complex() functions.
> > > Pins not applicable for fast path are processed as before, skipping
> > > over the 'fast' ones.
> > >
> > > Cc: Jonathan Corbet <corbet@lwn.net>
> > > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> >
> > I've just noticed that this patch landed in today's linux-next. Sadly it
> > breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
> > device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
> >
> > Booting hangs after detecting MMC cards. Reverting this patch fixes the
> > boot. I will try later to add some debugs and investigate it further what
> > really happens when booting hangs.
>
> Hi Marek,
>
> Thanks for reporting. Could you please try the following fix?
Hi again,
I realized the patch was not correct, j, not i, should be updated in second
hunk. Please try the following one.
Thanks,
Janusz
>From a919c504850f6cb40e8e81267a3a37537f7c4fd4 Mon Sep 17 00:00:00 2001
From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Date: Thu, 20 Sep 2018 17:37:21 +0200
Subject: [PATCH] gpiolib: Fix bitmap index not updated
While skipping fast path bits, bitmap index is not updated with next
found zero bit position. Fix it.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
drivers/gpio/gpiolib.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a53d17745d21..369bdd358fcc 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
__set_bit(hwgpio, mask);
if (array_info)
- find_next_zero_bit(array_info->get_mask,
+ i = find_next_zero_bit(array_info->get_mask,
array_size, i);
else
i++;
@@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
trace_gpio_value(desc_to_gpio(desc), 1, value);
if (array_info)
- find_next_zero_bit(array_info->get_mask, i, j);
+ j = find_next_zero_bit(array_info->get_mask, i,
+ j);
else
j++;
}
@@ -3192,7 +3193,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
}
if (array_info)
- find_next_zero_bit(array_info->set_mask,
+ i = find_next_zero_bit(array_info->set_mask,
array_size, i);
else
i++;
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-20 15:48 ` Janusz Krzysztofik
2018-09-20 16:21 ` Janusz Krzysztofik
@ 2018-09-20 18:05 ` Dan Carpenter
1 sibling, 0 replies; 75+ messages in thread
From: Dan Carpenter @ 2018-09-20 18:05 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio, Linus Walleij,
Dominik Brodowski, Yegor Yefremov, David S. Miller, linux-i2c,
Peter Meerwald-Stadler, Marek Szyprowski, devel,
Florian Fainelli, Jonathan Corbet, Krzysztof Kozlowski,
Kishon Vijay Abraham I, Tony Lindgren, Peter Korsgaard,
Geert Uytterhoeven, linux-serial, Jiri Slaby, Michael Hennerich,
Uwe Kleine-König
On Thu, Sep 20, 2018 at 05:48:22PM +0200, Janusz Krzysztofik wrote:
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a53d17745d21..5bc3447949c9 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> __set_bit(hwgpio, mask);
>
> if (array_info)
> - find_next_zero_bit(array_info->get_mask,
> + i = find_next_zero_bit(array_info->get_mask,
> array_size, i);
We could mark find_next_zero_bit() and friends as a __must_check
functions so we avoid this bug in the future. I have a more complicated
idea how to detect these bugs in a generic way using Smatch but it will
take longer to implement.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-20 16:21 ` Janusz Krzysztofik
@ 2018-09-21 8:18 ` Marek Szyprowski
2018-09-21 10:51 ` Janusz Krzysztofik
0 siblings, 1 reply; 75+ messages in thread
From: Marek Szyprowski @ 2018-09-21 8:18 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio, Linus Walleij,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Krzysztof Kozlowski, Kishon Vijay Abraham I, Tony Lindgren,
Lukas Wunner, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King
Hi Janusz,
On 2018-09-20 18:21, Janusz Krzysztofik wrote:
> On Thursday, September 20, 2018 5:48:22 PM CEST Janusz Krzysztofik wrote:
>> On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski wrote:
>>> On 2018-09-02 14:01, Janusz Krzysztofik wrote:
>>>> Certain GPIO descriptor arrays returned by gpio_get_array() may contain
>>>> information on direct mapping of array members to pins of a single GPIO
>>>> chip in hardware order. In such cases, bitmaps of values can be passed
>>>> directly from/to the chip's .get/set_multiple() callbacks without
>>>> wasting time on iterations.
>>>>
>>>> Add respective code to gpiod_get/set_array_bitmap_complex() functions.
>>>> Pins not applicable for fast path are processed as before, skipping
>>>> over the 'fast' ones.
>>>>
>>>> Cc: Jonathan Corbet <corbet@lwn.net>
>>>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>>> I've just noticed that this patch landed in today's linux-next. Sadly it
>>> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
>>> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
>>>
>>> Booting hangs after detecting MMC cards. Reverting this patch fixes the
>>> boot. I will try later to add some debugs and investigate it further what
>>> really happens when booting hangs.
>> Hi Marek,
>>
>> Thanks for reporting. Could you please try the following fix?
> Hi again,
>
> I realized the patch was not correct, j, not i, should be updated in second
> hunk. Please try the following one.
>
> Thanks,
> Janusz
>
> >From a919c504850f6cb40e8e81267a3a37537f7c4fd4 Mon Sep 17 00:00:00 2001
> From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> Date: Thu, 20 Sep 2018 17:37:21 +0200
> Subject: [PATCH] gpiolib: Fix bitmap index not updated
> While skipping fast path bits, bitmap index is not updated with next
> found zero bit position. Fix it.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
This one also doesn't help. A quick compare of logs with this version and
a working system shows, that with your patch (and fix) there are no calls to
gpx0-2 pin (which are a part of mmc pwrseq), what causes mmc failure. If
you need any more information (what kind of logs will help?), let me know.
> ---
> drivers/gpio/gpiolib.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a53d17745d21..369bdd358fcc 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> __set_bit(hwgpio, mask);
>
> if (array_info)
> - find_next_zero_bit(array_info->get_mask,
> + i = find_next_zero_bit(array_info->get_mask,
> array_size, i);
> else
> i++;
> @@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> trace_gpio_value(desc_to_gpio(desc), 1, value);
>
> if (array_info)
> - find_next_zero_bit(array_info->get_mask, i, j);
> + j = find_next_zero_bit(array_info->get_mask, i,
> + j);
> else
> j++;
> }
> @@ -3192,7 +3193,7 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
> }
>
> if (array_info)
> - find_next_zero_bit(array_info->set_mask,
> + i = find_next_zero_bit(array_info->set_mask,
> array_size, i);
> else
> i++;
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-21 8:18 ` Marek Szyprowski
@ 2018-09-21 10:51 ` Janusz Krzysztofik
2018-09-21 11:26 ` Janusz Krzysztofik
2018-09-21 14:14 ` Marek Szyprowski
0 siblings, 2 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-21 10:51 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio, Linus Walleij,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Krzysztof Kozlowski, Kishon Vijay Abraham I, Tony Lindgren,
Lukas Wunner, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King
Hi Marek,
2018-09-21 10:18 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
> Hi Janusz,
>
> On 2018-09-20 18:21, Janusz Krzysztofik wrote:
>> On Thursday, September 20, 2018 5:48:22 PM CEST Janusz Krzysztofik wrote:
>>> On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski wrote:
>>>> On 2018-09-02 14:01, Janusz Krzysztofik wrote:
>>>>> Certain GPIO descriptor arrays returned by gpio_get_array() may
>>>>> contain
>>>>> information on direct mapping of array members to pins of a single
>>>>> GPIO
>>>>> chip in hardware order. In such cases, bitmaps of values can be
>>>>> passed
>>>>> directly from/to the chip's .get/set_multiple() callbacks without
>>>>> wasting time on iterations.
>>>>>
>>>>> Add respective code to gpiod_get/set_array_bitmap_complex() functions.
>>>>> Pins not applicable for fast path are processed as before, skipping
>>>>> over the 'fast' ones.
>>>>>
>>>>> Cc: Jonathan Corbet <corbet@lwn.net>
>>>>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>>>> I've just noticed that this patch landed in today's linux-next. Sadly
>>>> it
>>>> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
>>>> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
>>>>
>>>> Booting hangs after detecting MMC cards. Reverting this patch fixes the
>>>> boot. I will try later to add some debugs and investigate it further
>>>> what
>>>> really happens when booting hangs.
>>> Hi Marek,
>>>
>>> Thanks for reporting. Could you please try the following fix?
>> Hi again,
>>
>> I realized the patch was not correct, j, not i, should be updated in
>> second
>> hunk. Please try the following one.
>>
>> Thanks,
>> Janusz
>>
>> >From a919c504850f6cb40e8e81267a3a37537f7c4fd4 Mon Sep 17 00:00:00 2001
>> From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>> Date: Thu, 20 Sep 2018 17:37:21 +0200
>> Subject: [PATCH] gpiolib: Fix bitmap index not updated
>> While skipping fast path bits, bitmap index is not updated with next
>> found zero bit position. Fix it.
>>
>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>
> This one also doesn't help. A quick compare of logs with this version and
> a working system shows, that with your patch (and fix) there are no calls
> to
> gpx0-2 pin (which are a part of mmc pwrseq), what causes mmc failure. If
> you need any more information (what kind of logs will help?), let me know.
There is a debug message on array_info content available at the end of
gpiod_get_array(), could you please activate it and post the message so
we can understand better what is going on?
On the other hand, I've had a look your device-tree configuration and
it looks like that specific setup won't benefit from the fast bitmap path.
You have pin 2 at position 0 and pin 1 at position 1 of the array.
Hence, the fast bitmap path covers only pin 1, and pin 2 is processed
by the old path with apparently buggy code for skipping over fast pins.
As a temporary workaround, you could try to revert the order of pins in
your dts file (pin 1 at position 0, pin 2 at 1) and the mmc pwrseq code
should work for you again by taking the original old path, not skipping
over fast pins. Results of such check may also help us to better
understand and resolve the issue.
Thanks,
Janusz
>
>> ---
>> drivers/gpio/gpiolib.c | 7 ++++---
>> 1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
>> index a53d17745d21..369bdd358fcc 100644
>> --- a/drivers/gpio/gpiolib.c
>> +++ b/drivers/gpio/gpiolib.c
>> @@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool
>> can_sleep,
>> __set_bit(hwgpio, mask);
>>
>> if (array_info)
>> - find_next_zero_bit(array_info->get_mask,
>> + i = find_next_zero_bit(array_info->get_mask,
>> array_size, i);
>> else
>> i++;
>> @@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool
>> can_sleep,
>> trace_gpio_value(desc_to_gpio(desc), 1, value);
>>
>> if (array_info)
>> - find_next_zero_bit(array_info->get_mask, i, j);
>> + j = find_next_zero_bit(array_info->get_mask, i,
>> + j);
>> else
>> j++;
>> }
>> @@ -3192,7 +3193,7 @@ int gpiod_set_array_value_complex(bool raw, bool
>> can_sleep,
>> }
>>
>> if (array_info)
>> - find_next_zero_bit(array_info->set_mask,
>> + i = find_next_zero_bit(array_info->set_mask,
>> array_size, i);
>> else
>> i++;
>
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>
>
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-21 10:51 ` Janusz Krzysztofik
@ 2018-09-21 11:26 ` Janusz Krzysztofik
2018-09-21 14:14 ` Marek Szyprowski
1 sibling, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-21 11:26 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski,
Greg Kroah-Hartman, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Jiri Slaby, Willy Tarreau
Hi Marek,
2018-09-21 12:51 GMT+02:00, Janusz Krzysztofik <jmkrzyszt@gmail.com>:
> Hi Marek,
>
> 2018-09-21 10:18 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
>> Hi Janusz,
>>
>> On 2018-09-20 18:21, Janusz Krzysztofik wrote:
>>> On Thursday, September 20, 2018 5:48:22 PM CEST Janusz Krzysztofik
>>> wrote:
>>>> On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski
>>>> wrote:
>>>>> On 2018-09-02 14:01, Janusz Krzysztofik wrote:
>>>>>> Certain GPIO descriptor arrays returned by gpio_get_array() may
>>>>>> contain
>>>>>> information on direct mapping of array members to pins of a single
>>>>>> GPIO
>>>>>> chip in hardware order. In such cases, bitmaps of values can be
>>>>>> passed
>>>>>> directly from/to the chip's .get/set_multiple() callbacks without
>>>>>> wasting time on iterations.
>>>>>>
>>>>>> Add respective code to gpiod_get/set_array_bitmap_complex()
>>>>>> functions.
>>>>>> Pins not applicable for fast path are processed as before, skipping
>>>>>> over the 'fast' ones.
>>>>>>
>>>>>> Cc: Jonathan Corbet <corbet@lwn.net>
>>>>>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>>>>> I've just noticed that this patch landed in today's linux-next. Sadly
>>>>> it
>>>>> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
>>>>> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
>>>>>
>>>>> Booting hangs after detecting MMC cards. Reverting this patch fixes
>>>>> the
>>>>> boot. I will try later to add some debugs and investigate it further
>>>>> what
>>>>> really happens when booting hangs.
>>>> Hi Marek,
>>>>
>>>> Thanks for reporting. Could you please try the following fix?
>>> Hi again,
>>>
>>> I realized the patch was not correct, j, not i, should be updated in
>>> second
>>> hunk. Please try the following one.
>>>
>>> Thanks,
>>> Janusz
>>>
>>> >From a919c504850f6cb40e8e81267a3a37537f7c4fd4 Mon Sep 17 00:00:00 2001
>>> From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>>> Date: Thu, 20 Sep 2018 17:37:21 +0200
>>> Subject: [PATCH] gpiolib: Fix bitmap index not updated
>>> While skipping fast path bits, bitmap index is not updated with next
>>> found zero bit position. Fix it.
>>>
>>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>>
>> This one also doesn't help. A quick compare of logs with this version and
>> a working system shows, that with your patch (and fix) there are no calls
>> to
>> gpx0-2 pin (which are a part of mmc pwrseq), what causes mmc failure. If
>> you need any more information (what kind of logs will help?), let me
>> know.
One more question. You said before that booting hanged after detecting MMC
cards. Without the fix, I could imagine it keeps iterating with index not
updated and simply never returns from gpiod_get/set_array_bitmap_complex().
Is the behaviour you observe the same with the fix applied?
Thanks,
Janusz
> There is a debug message on array_info content available at the end of
> gpiod_get_array(), could you please activate it and post the message so
> we can understand better what is going on?
>
> On the other hand, I've had a look your device-tree configuration and
> it looks like that specific setup won't benefit from the fast bitmap path.
> You have pin 2 at position 0 and pin 1 at position 1 of the array.
> Hence, the fast bitmap path covers only pin 1, and pin 2 is processed
> by the old path with apparently buggy code for skipping over fast pins.
>
> As a temporary workaround, you could try to revert the order of pins in
> your dts file (pin 1 at position 0, pin 2 at 1) and the mmc pwrseq code
> should work for you again by taking the original old path, not skipping
> over fast pins. Results of such check may also help us to better
> understand and resolve the issue.
>
> Thanks,
> Janusz
>
>>
>>> ---
>>> drivers/gpio/gpiolib.c | 7 ++++---
>>> 1 file changed, 4 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
>>> index a53d17745d21..369bdd358fcc 100644
>>> --- a/drivers/gpio/gpiolib.c
>>> +++ b/drivers/gpio/gpiolib.c
>>> @@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool
>>> can_sleep,
>>> __set_bit(hwgpio, mask);
>>>
>>> if (array_info)
>>> - find_next_zero_bit(array_info->get_mask,
>>> + i = find_next_zero_bit(array_info->get_mask,
>>> array_size, i);
>>> else
>>> i++;
>>> @@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool
>>> can_sleep,
>>> trace_gpio_value(desc_to_gpio(desc), 1, value);
>>>
>>> if (array_info)
>>> - find_next_zero_bit(array_info->get_mask, i, j);
>>> + j = find_next_zero_bit(array_info->get_mask, i,
>>> + j);
>>> else
>>> j++;
>>> }
>>> @@ -3192,7 +3193,7 @@ int gpiod_set_array_value_complex(bool raw, bool
>>> can_sleep,
>>> }
>>>
>>> if (array_info)
>>> - find_next_zero_bit(array_info->set_mask,
>>> + i = find_next_zero_bit(array_info->set_mask,
>>> array_size, i);
>>> else
>>> i++;
>>
>> Best regards
>> --
>> Marek Szyprowski, PhD
>> Samsung R&D Institute Poland
>>
>>
>
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-21 10:51 ` Janusz Krzysztofik
2018-09-21 11:26 ` Janusz Krzysztofik
@ 2018-09-21 14:14 ` Marek Szyprowski
2018-09-23 10:43 ` Janusz Krzysztofik
1 sibling, 1 reply; 75+ messages in thread
From: Marek Szyprowski @ 2018-09-21 14:14 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski,
Greg Kroah-Hartman, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Jiri Slaby, Willy Tarreau
Hi Janusz,
On 2018-09-21 12:51, Janusz Krzysztofik wrote:
> 2018-09-21 10:18 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
>> On 2018-09-20 18:21, Janusz Krzysztofik wrote:
>>> On Thursday, September 20, 2018 5:48:22 PM CEST Janusz Krzysztofik wrote:
>>>> On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski wrote:
>>>>> On 2018-09-02 14:01, Janusz Krzysztofik wrote:
>>>>>> Certain GPIO descriptor arrays returned by gpio_get_array() may
>>>>>> contain
>>>>>> information on direct mapping of array members to pins of a single
>>>>>> GPIO
>>>>>> chip in hardware order. In such cases, bitmaps of values can be
>>>>>> passed
>>>>>> directly from/to the chip's .get/set_multiple() callbacks without
>>>>>> wasting time on iterations.
>>>>>>
>>>>>> Add respective code to gpiod_get/set_array_bitmap_complex() functions.
>>>>>> Pins not applicable for fast path are processed as before, skipping
>>>>>> over the 'fast' ones.
>>>>>>
>>>>>> Cc: Jonathan Corbet <corbet@lwn.net>
>>>>>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>>>>> I've just noticed that this patch landed in today's linux-next. Sadly
>>>>> it
>>>>> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
>>>>> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
>>>>>
>>>>> Booting hangs after detecting MMC cards. Reverting this patch fixes the
>>>>> boot. I will try later to add some debugs and investigate it further
>>>>> what
>>>>> really happens when booting hangs.
>>>> Hi Marek,
>>>>
>>>> Thanks for reporting. Could you please try the following fix?
>>> Hi again,
>>>
>>> I realized the patch was not correct, j, not i, should be updated in
>>> second
>>> hunk. Please try the following one.
>>>
>>> Thanks,
>>> Janusz
>>>
>>> >From a919c504850f6cb40e8e81267a3a37537f7c4fd4 Mon Sep 17 00:00:00 2001
>>> From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>>> Date: Thu, 20 Sep 2018 17:37:21 +0200
>>> Subject: [PATCH] gpiolib: Fix bitmap index not updated
>>> While skipping fast path bits, bitmap index is not updated with next
>>> found zero bit position. Fix it.
>>>
>>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>> This one also doesn't help. A quick compare of logs with this version and
>> a working system shows, that with your patch (and fix) there are no calls
>> to
>> gpx0-2 pin (which are a part of mmc pwrseq), what causes mmc failure. If
>> you need any more information (what kind of logs will help?), let me know.
> There is a debug message on array_info content available at the end of
> gpiod_get_array(), could you please activate it and post the message so
> we can understand better what is going on?
With debug enabled on next-20180919:
[ 2.499153] pwrseq_simple mmc3_pwrseq: GPIO array info: chip=gpx0,
size=2, get_mask=2, set_mask=2, invert_mask=2
On next-20180920 I get no this message and booting hangs.
Same with next-20180920 + your second fix from this thread.
I will try to debug this more on Monday.
> On the other hand, I've had a look your device-tree configuration and
> it looks like that specific setup won't benefit from the fast bitmap path.
> You have pin 2 at position 0 and pin 1 at position 1 of the array.
> Hence, the fast bitmap path covers only pin 1, and pin 2 is processed
> by the old path with apparently buggy code for skipping over fast pins.
>
> As a temporary workaround, you could try to revert the order of pins in
> your dts file (pin 1 at position 0, pin 2 at 1) and the mmc pwrseq code
> should work for you again by taking the original old path, not skipping
> over fast pins. Results of such check may also help us to better
> understand and resolve the issue.
Changing the order of mmc pwrseq gpio pins fixes boot hang.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
2018-09-21 14:14 ` Marek Szyprowski
@ 2018-09-23 10:43 ` Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Janusz Krzysztofik
0 siblings, 1 reply; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-23 10:43 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Andrew Lunn, Ulf Hansson, linux-doc, linux-iio, Linus Walleij,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Janusz Krzysztofik, Krzysztof Kozlowski, Kishon Vijay Abraham I,
Tony Lindgren, Lukas Wunner, Geert Uytterhoeven, linux-serial,
Jiri Slaby, Michael Hennerich, Uwe Kleine-König, linux-gpio
On Friday, September 21, 2018 4:14:06 PM CEST Marek Szyprowski wrote:
> Hi Janusz,
>
>
> On 2018-09-21 12:51, Janusz Krzysztofik wrote:
> > 2018-09-21 10:18 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
> >> On 2018-09-20 18:21, Janusz Krzysztofik wrote:
> >>> On Thursday, September 20, 2018 5:48:22 PM CEST Janusz Krzysztofik wrote:
> >>>> On Thursday, September 20, 2018 12:11:48 PM CEST Marek Szyprowski
wrote:
> >>>>> On 2018-09-02 14:01, Janusz Krzysztofik wrote:
> >>>>>> Certain GPIO descriptor arrays returned by gpio_get_array() may
> >>>>>> contain
> >>>>>> information on direct mapping of array members to pins of a single
> >>>>>> GPIO
> >>>>>> chip in hardware order. In such cases, bitmaps of values can be
> >>>>>> passed
> >>>>>> directly from/to the chip's .get/set_multiple() callbacks without
> >>>>>> wasting time on iterations.
> >>>>>>
> >>>>>> Add respective code to gpiod_get/set_array_bitmap_complex()
functions.
> >>>>>> Pins not applicable for fast path are processed as before, skipping
> >>>>>> over the 'fast' ones.
> >>>>>>
> >>>>>> Cc: Jonathan Corbet <corbet@lwn.net>
> >>>>>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> >>>>> I've just noticed that this patch landed in today's linux-next. Sadly
> >>>>> it
> >>>>> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
> >>>>> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).
> >>>>>
> >>>>> Booting hangs after detecting MMC cards. Reverting this patch fixes the
> >>>>> boot. I will try later to add some debugs and investigate it further
> >>>>> what
> >>>>> really happens when booting hangs.
> >>>> Hi Marek,
> >>>>
> >>>> Thanks for reporting. Could you please try the following fix?
> >>> Hi again,
> >>>
> >>> I realized the patch was not correct, j, not i, should be updated in
> >>> second
> >>> hunk. Please try the following one.
> >>>
> >>> Thanks,
> >>> Janusz
> >>>
> >>> >From a919c504850f6cb40e8e81267a3a37537f7c4fd4 Mon Sep 17 00:00:00 2001
> >>> From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> >>> Date: Thu, 20 Sep 2018 17:37:21 +0200
> >>> Subject: [PATCH] gpiolib: Fix bitmap index not updated
> >>> While skipping fast path bits, bitmap index is not updated with next
> >>> found zero bit position. Fix it.
> >>>
> >>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> >> This one also doesn't help. A quick compare of logs with this version and
> >> a working system shows, that with your patch (and fix) there are no calls
> >> to
> >> gpx0-2 pin (which are a part of mmc pwrseq), what causes mmc failure. If
> >> you need any more information (what kind of logs will help?), let me
know.
> > There is a debug message on array_info content available at the end of
> > gpiod_get_array(), could you please activate it and post the message so
> > we can understand better what is going on?
>
> With debug enabled on next-20180919:
> [ 2.499153] pwrseq_simple mmc3_pwrseq: GPIO array info: chip=gpx0,
> size=2, get_mask=2, set_mask=2, invert_mask=2
Looks good to me, i..e., in line with what one could expect. However, ...
> On next-20180920 I get no this message and booting hangs.
>
> Same with next-20180920 + your second fix from this thread.
>
> I will try to debug this more on Monday.
>
> > On the other hand, I've had a look your device-tree configuration and
> > it looks like that specific setup won't benefit from the fast bitmap path.
> > You have pin 2 at position 0 and pin 1 at position 1 of the array.
> > Hence, the fast bitmap path covers only pin 1, and pin 2 is processed
> > by the old path with apparently buggy code for skipping over fast pins.
> >
> > As a temporary workaround, you could try to revert the order of pins in
> > your dts file (pin 1 at position 0, pin 2 at 1) and the mmc pwrseq code
> > should work for you again by taking the original old path, not skipping
> > over fast pins. Results of such check may also help us to better
> > understand and resolve the issue.
>
> Changing the order of mmc pwrseq gpio pins fixes boot hang.
Not being able to discover more coding bugs in the code modified by the series,
I'm wondering if the reason for the issue you are observing comes from the
fact both pins are no longer manipulated together within a single
.set_multiple() chip callback. I'm working on a fix which prevents from that.
Thanks,
Janusz
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path
2018-09-23 10:43 ` Janusz Krzysztofik
@ 2018-09-23 23:53 ` Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 1/2] gpiolib: Fix missing updates of bitmap index Janusz Krzysztofik
` (2 more replies)
0 siblings, 3 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-23 23:53 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, linux-doc, Tony Lindgren,
Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, Marek Szyprowski, devel,
Florian Fainelli, Jonathan Corbet, Janusz Krzysztofik,
Krzysztof Kozlowski, Kishon Vijay Abraham I, linux-iio,
Peter Korsgaard, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio
While investigating possible reasons of GPIO fast bitmap processing
related boot hang on Samsung Snow Chromebook, reported by Marek
Szyprowski (thanks!), I've discovered one coding bug, addressed by
PATCH 1/2 of this series, and one potential regression introduced at
design level of the solution, hopefully fixed by PATCH 2/2. See
commit messages for details.
Janusz Krzysztofik (2):
gpiolib: Fix missing updates of bitmap index
gpiolib: Fix array members of same chip processed separately
The fixes should resolve the boot hang observed by Marek, however the
second change excludes that particular case from fast bitmap processing
and restores the old behaviour. Hence, it is possible still another
issue which have had an influence on that boot hang exists in the code.
In order to fully verify the fix, it would have to be tested on a
platform where an array of GPIO descriptors is used which starts from
at least two consecutive pins of one GPIO chip in hardware order,
starting ftom 0, followed by one or more pins belonging to other
chip(s).
In order to verify if separate calls to .set() chip callback for each
pin instead of one call to .set_multiple() is actually the reason of
boot hang on Samsung Snow Chromebook, the affected driver -
drivers/mmc/core/pwrseq_simple.c - would have to be temporarily
modified for testing purposes so it calls gpiod_set_value() for each
pin instead of gpiod_set_array_value() for all of them. If that would
also result in boot hang, we could be sure the issue was really the
one addressed by the second fix. Marek, could you please try to
perform such test?
Thanks,
Janusz
diffstat:
Documentation/driver-api/gpio/board.rst | 19 +++++++++----
drivers/gpio/gpiolib.c | 46 +++++++++++++++++++++-----------
2 files changed, 45 insertions(+), 20 deletions(-)
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH 1/2] gpiolib: Fix missing updates of bitmap index
2018-09-23 23:53 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Janusz Krzysztofik
@ 2018-09-23 23:53 ` Janusz Krzysztofik
2018-09-24 8:11 ` Linus Walleij
2018-09-29 12:20 ` [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit() Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 2/2] gpiolib: Fix array members of same chip processed separately Janusz Krzysztofik
2018-09-24 9:43 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Marek Szyprowski
2 siblings, 2 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-23 23:53 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
In new code introduced by commit b17566a6b08b ("gpiolib: Implement fast
processing path in get/set array"), bitmap index is not updated with
next found zero bit position as it should while skipping over pins
already processed via fast bitmap path, possibly resulting in an
infinite loop. Fix it.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
drivers/gpio/gpiolib.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a53d17745d21..7d9536a79a66 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2880,8 +2880,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
__set_bit(hwgpio, mask);
if (array_info)
- find_next_zero_bit(array_info->get_mask,
- array_size, i);
+ i = find_next_zero_bit(array_info->get_mask,
+ array_size, i);
else
i++;
} while ((i < array_size) &&
@@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
trace_gpio_value(desc_to_gpio(desc), 1, value);
if (array_info)
- find_next_zero_bit(array_info->get_mask, i, j);
+ j = find_next_zero_bit(array_info->get_mask, i,
+ j);
else
j++;
}
@@ -3192,8 +3193,8 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
}
if (array_info)
- find_next_zero_bit(array_info->set_mask,
- array_size, i);
+ i = find_next_zero_bit(array_info->set_mask,
+ array_size, i);
else
i++;
} while ((i < array_size) &&
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* [PATCH 2/2] gpiolib: Fix array members of same chip processed separately
2018-09-23 23:53 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 1/2] gpiolib: Fix missing updates of bitmap index Janusz Krzysztofik
@ 2018-09-23 23:53 ` Janusz Krzysztofik
2018-09-24 8:13 ` Linus Walleij
2018-09-24 9:43 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Marek Szyprowski
2 siblings, 1 reply; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-23 23:53 UTC (permalink / raw)
To: Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
New code introduced by commit bf9346f5d47b ("gpiolib: Identify arrays
matching GPIO hardware") forcibly tries to find an array member which
has its array index number equal to its hardware pin number and set
up an array info for possible fast bitmap processing of all arrray
pins belonging to that chip which also satisfy that numbering rule.
Depending on array content, it may happen that consecutive array
members which belong to the same chip but don't have array indexes
equal to their pin hardware numbers will be split into groups, some of
them processed together via the fast bitmap path, and rest of them
separetely. However, applications may expect all those pins being
processed together with a single call to .set_multiple() chip callback,
like that was done before the change.
Limit applicability of fast bitmap processing path to cases where all
pins of consecutive array members starting from 0 which belong to the
same chip have their hardware numbers equal to their corresponding
array indexes. That should still speed up processing of applications
using whole GPIO banks as I/O ports, while not breaking simultaneous
manipulation of consecutive pins of the same chip which don't follow
the equal numbering rule.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Documentation/driver-api/gpio/board.rst | 19 +++++++++++++-----
drivers/gpio/gpiolib.c | 35 +++++++++++++++++++++++----------
2 files changed, 39 insertions(+), 15 deletions(-)
diff --git a/Documentation/driver-api/gpio/board.rst b/Documentation/driver-api/gpio/board.rst
index c66821e033c2..a0f294e2e250 100644
--- a/Documentation/driver-api/gpio/board.rst
+++ b/Documentation/driver-api/gpio/board.rst
@@ -202,9 +202,18 @@ mapped to the device determines if the array qualifies for fast bitmap
processing. If yes, a bitmap is passed over get/set array functions directly
between a caller and a respective .get/set_multiple() callback of a GPIO chip.
-In order to qualify for fast bitmap processing, the pin mapping must meet the
+In order to qualify for fast bitmap processing, the array must meet the
following requirements:
-- it must belong to the same chip as other 'fast' pins of the function,
-- its index within the function must match its hardware number within the chip.
-
-Open drain and open source pins are excluded from fast bitmap output processing.
+- pin hardware number of array member 0 must also be 0,
+- pin hardware numbers of consecutive array members which belong to the same
+ chip as member 0 does must also match their array indexes.
+
+Otherwise fast bitmap processing path is not used in order to avoid consecutive
+pins which belong to the same chip but are not in hardware order being processed
+separately.
+
+If the array applies for fast bitmap processing path, pins which belong to
+different chips than member 0 does, as well as those with indexes different from
+their hardware pin numbers, are excluded from the fast path, both input and
+output. Moreover, open drain and open source pins are excluded from fast bitmap
+output processing.
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 7d9536a79a66..6ae13e3e05f1 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4376,11 +4376,10 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
chip = gpiod_to_chip(desc);
/*
- * Select a chip of first array member
- * whose index matches its pin hardware number
- * as a candidate for fast bitmap processing.
+ * If pin hardware number of array member 0 is also 0, select
+ * its chip as a candidate for fast bitmap processing path.
*/
- if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) {
+ if (descs->ndescs == 0 && gpio_chip_hwgpio(desc) == 0) {
struct gpio_descs *array;
bitmap_size = BITS_TO_LONGS(chip->ngpio > count ?
@@ -4414,14 +4413,30 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
count - descs->ndescs);
descs->info = array_info;
}
- /*
- * Unmark members which don't qualify for fast bitmap
- * processing (different chip, not in hardware order)
- */
- if (array_info && (chip != array_info->chip ||
- gpio_chip_hwgpio(desc) != descs->ndescs)) {
+ /* Unmark array members which don't belong to the 'fast' chip */
+ if (array_info && array_info->chip != chip) {
__clear_bit(descs->ndescs, array_info->get_mask);
__clear_bit(descs->ndescs, array_info->set_mask);
+ }
+ /*
+ * Detect array members which belong to the 'fast' chip
+ * but their pins are not in hardware order.
+ */
+ else if (array_info &&
+ gpio_chip_hwgpio(desc) != descs->ndescs) {
+ /*
+ * Don't use fast path if all array members processed so
+ * far belong to the same chip as this one but its pin
+ * hardware number is different from its array index.
+ */
+ if (bitmap_full(array_info->get_mask, descs->ndescs)) {
+ array_info = NULL;
+ } else {
+ __clear_bit(descs->ndescs,
+ array_info->get_mask);
+ __clear_bit(descs->ndescs,
+ array_info->set_mask);
+ }
} else if (array_info) {
/* Exclude open drain or open source from fast output */
if (gpiochip_line_is_open_drain(chip, descs->ndescs) ||
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH 1/2] gpiolib: Fix missing updates of bitmap index
2018-09-23 23:53 ` [PATCH 1/2] gpiolib: Fix missing updates of bitmap index Janusz Krzysztofik
@ 2018-09-24 8:11 ` Linus Walleij
2018-09-29 12:20 ` [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit() Janusz Krzysztofik
1 sibling, 0 replies; 75+ messages in thread
From: Linus Walleij @ 2018-09-24 8:11 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg KH, kishon,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald, Jiri Slaby, Willy Tarreau,
Geert Uytterhoeven, Sebastien Bourdelin
On Mon, Sep 24, 2018 at 1:52 AM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> In new code introduced by commit b17566a6b08b ("gpiolib: Implement fast
> processing path in get/set array"), bitmap index is not updated with
> next found zero bit position as it should while skipping over pins
> already processed via fast bitmap path, possibly resulting in an
> infinite loop. Fix it.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Patch applied!
Thanks for working on getting this into shape!
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH 2/2] gpiolib: Fix array members of same chip processed separately
2018-09-23 23:53 ` [PATCH 2/2] gpiolib: Fix array members of same chip processed separately Janusz Krzysztofik
@ 2018-09-24 8:13 ` Linus Walleij
0 siblings, 0 replies; 75+ messages in thread
From: Linus Walleij @ 2018-09-24 8:13 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg KH, kishon,
Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron,
Hartmut Knaack, Peter Meerwald, Jiri Slaby, Willy Tarreau,
Geert Uytterhoeven, Sebastien Bourdelin
On Mon, Sep 24, 2018 at 1:52 AM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> New code introduced by commit bf9346f5d47b ("gpiolib: Identify arrays
> matching GPIO hardware") forcibly tries to find an array member which
> has its array index number equal to its hardware pin number and set
> up an array info for possible fast bitmap processing of all arrray
> pins belonging to that chip which also satisfy that numbering rule.
>
> Depending on array content, it may happen that consecutive array
> members which belong to the same chip but don't have array indexes
> equal to their pin hardware numbers will be split into groups, some of
> them processed together via the fast bitmap path, and rest of them
> separetely. However, applications may expect all those pins being
> processed together with a single call to .set_multiple() chip callback,
> like that was done before the change.
>
> Limit applicability of fast bitmap processing path to cases where all
> pins of consecutive array members starting from 0 which belong to the
> same chip have their hardware numbers equal to their corresponding
> array indexes. That should still speed up processing of applications
> using whole GPIO banks as I/O ports, while not breaking simultaneous
> manipulation of consecutive pins of the same chip which don't follow
> the equal numbering rule.
>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Patch applied!
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path
2018-09-23 23:53 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 1/2] gpiolib: Fix missing updates of bitmap index Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 2/2] gpiolib: Fix array members of same chip processed separately Janusz Krzysztofik
@ 2018-09-24 9:43 ` Marek Szyprowski
2018-09-24 11:08 ` Janusz Krzysztofik
2 siblings, 1 reply; 75+ messages in thread
From: Marek Szyprowski @ 2018-09-24 9:43 UTC (permalink / raw)
To: Janusz Krzysztofik, Linus Walleij
Cc: Jonathan Corbet, Miguel Ojeda Sandonis, Peter Korsgaard,
Peter Rosin, Ulf Hansson, Andrew Lunn, Florian Fainelli,
David S. Miller, Dominik Brodowski, Greg Kroah-Hartman,
Kishon Vijay Abraham I, Lars-Peter Clausen, Michael Hennerich,
Jonathan Cameron, Hartmut Knaack, Peter Meerwald-Stadler,
Jiri Slaby, Willy Tarreau, Geert Uytterhoeven
Hi Janusz,
On 2018-09-24 01:53, Janusz Krzysztofik wrote:
> While investigating possible reasons of GPIO fast bitmap processing
> related boot hang on Samsung Snow Chromebook, reported by Marek
> Szyprowski (thanks!), I've discovered one coding bug, addressed by
> PATCH 1/2 of this series, and one potential regression introduced at
> design level of the solution, hopefully fixed by PATCH 2/2. See
> commit messages for details.
>
> Janusz Krzysztofik (2):
> gpiolib: Fix missing updates of bitmap index
> gpiolib: Fix array members of same chip processed separately
>
> The fixes should resolve the boot hang observed by Marek, however the
> second change excludes that particular case from fast bitmap processing
> and restores the old behaviour.
I confirm, that the above 2 patches fixes boot issue on Samsung Snow
Chromebook with next-20180920.
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Hence, it is possible still another
> issue which have had an influence on that boot hang exists in the code.
> In order to fully verify the fix, it would have to be tested on a
> platform where an array of GPIO descriptors is used which starts from
> at least two consecutive pins of one GPIO chip in hardware order,
> starting ftom 0, followed by one or more pins belonging to other
> chip(s).
>
> In order to verify if separate calls to .set() chip callback for each
> pin instead of one call to .set_multiple() is actually the reason of
> boot hang on Samsung Snow Chromebook, the affected driver -
> drivers/mmc/core/pwrseq_simple.c - would have to be temporarily
> modified for testing purposes so it calls gpiod_set_value() for each
> pin instead of gpiod_set_array_value() for all of them. If that would
> also result in boot hang, we could be sure the issue was really the
> one addressed by the second fix. Marek, could you please try to
> perform such test?
Yes, I've just tested next-20180920 only with the first patch from this
patchset and the mentioned change to drivers/mmc/core/pwrseq_simple.c.
It boots fine, so indeed the issue is in handling of arrays of gpios.
Just to be sure I did it right, this is my change to the mentioned file:
diff --git a/drivers/mmc/core/pwrseq_simple.c
b/drivers/mmc/core/pwrseq_simple.c
index 7f882a2bb872..9397dc1f2e38 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -38,16 +38,11 @@ static void mmc_pwrseq_simple_set_gpios_value(struct
mmc_pwrseq_simple *pwrseq,
int value)
{
struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
+ int i;
- if (!IS_ERR(reset_gpios)) {
- DECLARE_BITMAP(values, BITS_PER_TYPE(value));
- int nvalues = reset_gpios->ndescs;
-
- values[0] = value;
-
- gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
- reset_gpios->info, values);
- }
+ if (!IS_ERR(reset_gpios))
+ for (i = 0; i < reset_gpios->ndescs; i++)
+ gpiod_set_value_cansleep(reset_gpios->desc[i], value);
}
static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path
2018-09-24 9:43 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Marek Szyprowski
@ 2018-09-24 11:08 ` Janusz Krzysztofik
2018-09-24 11:38 ` Marek Szyprowski
0 siblings, 1 reply; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-24 11:08 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Andrew Lunn, Ulf Hansson, linux-doc, Tony Lindgren,
Linus Walleij, Dominik Brodowski, Peter Rosin, netdev, linux-i2c,
Peter Meerwald-Stadler, devel, Florian Fainelli, Jonathan Corbet,
Krzysztof Kozlowski, Kishon Vijay Abraham I, linux-iio,
Peter Korsgaard, Geert Uytterhoeven, linux-serial, Jiri Slaby,
Michael Hennerich, Uwe Kleine-König, linux-gpio,
Russell King
Hi Marek,
2018-09-24 11:43 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
> Hi Janusz,
>
> On 2018-09-24 01:53, Janusz Krzysztofik wrote:
>> While investigating possible reasons of GPIO fast bitmap processing
>> related boot hang on Samsung Snow Chromebook, reported by Marek
>> Szyprowski (thanks!), I've discovered one coding bug, addressed by
>> PATCH 1/2 of this series, and one potential regression introduced at
>> design level of the solution, hopefully fixed by PATCH 2/2. See
>> commit messages for details.
>>
>> Janusz Krzysztofik (2):
>> gpiolib: Fix missing updates of bitmap index
>> gpiolib: Fix array members of same chip processed separately
>>
>> The fixes should resolve the boot hang observed by Marek, however the
>> second change excludes that particular case from fast bitmap processing
>> and restores the old behaviour.
>
> I confirm, that the above 2 patches fixes boot issue on Samsung Snow
> Chromebook with next-20180920.
>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>
>> Hence, it is possible still another
>> issue which have had an influence on that boot hang exists in the code.
>> In order to fully verify the fix, it would have to be tested on a
>> platform where an array of GPIO descriptors is used which starts from
>> at least two consecutive pins of one GPIO chip in hardware order,
>> starting ftom 0, followed by one or more pins belonging to other
>> chip(s).
>>
>> In order to verify if separate calls to .set() chip callback for each
>> pin instead of one call to .set_multiple() is actually the reason of
>> boot hang on Samsung Snow Chromebook, the affected driver -
>> drivers/mmc/core/pwrseq_simple.c - would have to be temporarily
>> modified for testing purposes so it calls gpiod_set_value() for each
>> pin instead of gpiod_set_array_value() for all of them. If that would
>> also result in boot hang, we could be sure the issue was really the
>> one addressed by the second fix. Marek, could you please try to
>> perform such test?
>
> Yes, I've just tested next-20180920 only with the first patch from this
> patchset and the mentioned change to drivers/mmc/core/pwrseq_simple.c.
> It boots fine, so indeed the issue is in handling of arrays of gpios.
>
> Just to be sure I did it right, this is my change to the mentioned file:
Yeah, that's what I had on mind. However, I'd be more lucky if it didn't work
for you. Setting the pins sequentially, not simultaneously as before, was
exactly what I hoped was the reason of the hang.
> diff --git a/drivers/mmc/core/pwrseq_simple.c
> b/drivers/mmc/core/pwrseq_simple.c
> index 7f882a2bb872..9397dc1f2e38 100644
> --- a/drivers/mmc/core/pwrseq_simple.c
> +++ b/drivers/mmc/core/pwrseq_simple.c
> @@ -38,16 +38,11 @@ static void mmc_pwrseq_simple_set_gpios_value(struct
> mmc_pwrseq_simple *pwrseq,
> int value)
> {
> struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
> + int i;
>
> - if (!IS_ERR(reset_gpios)) {
> - DECLARE_BITMAP(values, BITS_PER_TYPE(value));
> - int nvalues = reset_gpios->ndescs;
> -
> - values[0] = value;
> -
> - gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
> - reset_gpios->info, values);
> - }
> + if (!IS_ERR(reset_gpios))
> + for (i = 0; i < reset_gpios->ndescs; i++)
The only difference from the behaviour when the hang was occurring is now
the order the pins are manipulated. Maybe that matters?
Could you please retry the same with the order of pins reversed, either in
the .dts file or here inside this for loop?
Thanks,
Janusz
> + gpiod_set_value_cansleep(reset_gpios->desc[i], value);
> }
>
> static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
>
>
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>
>
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path
2018-09-24 11:08 ` Janusz Krzysztofik
@ 2018-09-24 11:38 ` Marek Szyprowski
2018-09-24 14:18 ` Janusz Krzysztofik
0 siblings, 1 reply; 75+ messages in thread
From: Marek Szyprowski @ 2018-09-24 11:38 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski,
Greg Kroah-Hartman, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Jiri Slaby, Willy Tarreau
Hi Janusz,
On 2018-09-24 13:08, Janusz Krzysztofik wrote:
> 2018-09-24 11:43 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
>> On 2018-09-24 01:53, Janusz Krzysztofik wrote:
>>> While investigating possible reasons of GPIO fast bitmap processing
>>> related boot hang on Samsung Snow Chromebook, reported by Marek
>>> Szyprowski (thanks!), I've discovered one coding bug, addressed by
>>> PATCH 1/2 of this series, and one potential regression introduced at
>>> design level of the solution, hopefully fixed by PATCH 2/2. See
>>> commit messages for details.
>>>
>>> Janusz Krzysztofik (2):
>>> gpiolib: Fix missing updates of bitmap index
>>> gpiolib: Fix array members of same chip processed separately
>>>
>>> The fixes should resolve the boot hang observed by Marek, however the
>>> second change excludes that particular case from fast bitmap processing
>>> and restores the old behaviour.
>> I confirm, that the above 2 patches fixes boot issue on Samsung Snow
>> Chromebook with next-20180920.
>>
>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>>
>>> Hence, it is possible still another
>>> issue which have had an influence on that boot hang exists in the code.
>>> In order to fully verify the fix, it would have to be tested on a
>>> platform where an array of GPIO descriptors is used which starts from
>>> at least two consecutive pins of one GPIO chip in hardware order,
>>> starting ftom 0, followed by one or more pins belonging to other
>>> chip(s).
>>>
>>> In order to verify if separate calls to .set() chip callback for each
>>> pin instead of one call to .set_multiple() is actually the reason of
>>> boot hang on Samsung Snow Chromebook, the affected driver -
>>> drivers/mmc/core/pwrseq_simple.c - would have to be temporarily
>>> modified for testing purposes so it calls gpiod_set_value() for each
>>> pin instead of gpiod_set_array_value() for all of them. If that would
>>> also result in boot hang, we could be sure the issue was really the
>>> one addressed by the second fix. Marek, could you please try to
>>> perform such test?
>> Yes, I've just tested next-20180920 only with the first patch from this
>> patchset and the mentioned change to drivers/mmc/core/pwrseq_simple.c.
>> It boots fine, so indeed the issue is in handling of arrays of gpios.
>>
>> Just to be sure I did it right, this is my change to the mentioned file:
> Yeah, that's what I had on mind. However, I'd be more lucky if it didn't work
> for you. Setting the pins sequentially, not simultaneously as before, was
> exactly what I hoped was the reason of the hang.
>
>> diff --git a/drivers/mmc/core/pwrseq_simple.c
>> b/drivers/mmc/core/pwrseq_simple.c
>> index 7f882a2bb872..9397dc1f2e38 100644
>> --- a/drivers/mmc/core/pwrseq_simple.c
>> +++ b/drivers/mmc/core/pwrseq_simple.c
>> @@ -38,16 +38,11 @@ static void mmc_pwrseq_simple_set_gpios_value(struct
>> mmc_pwrseq_simple *pwrseq,
>> int value)
>> {
>> struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
>> + int i;
>>
>> - if (!IS_ERR(reset_gpios)) {
>> - DECLARE_BITMAP(values, BITS_PER_TYPE(value));
>> - int nvalues = reset_gpios->ndescs;
>> -
>> - values[0] = value;
>> -
>> - gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
>> - reset_gpios->info, values);
>> - }
>> + if (!IS_ERR(reset_gpios))
>> + for (i = 0; i < reset_gpios->ndescs; i++)
> The only difference from the behaviour when the hang was occurring is now
> the order the pins are manipulated. Maybe that matters?
> Could you please retry the same with the order of pins reversed, either in
> the .dts file or here inside this for loop?
I've switched the order of pins in dts and next-20180920 + first patch +
above
change also boots fine.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path
2018-09-24 11:38 ` Marek Szyprowski
@ 2018-09-24 14:18 ` Janusz Krzysztofik
0 siblings, 0 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-24 14:18 UTC (permalink / raw)
To: Marek Szyprowski
Cc: Linus Walleij, Jonathan Corbet, Miguel Ojeda Sandonis,
Peter Korsgaard, Peter Rosin, Ulf Hansson, Andrew Lunn,
Florian Fainelli, David S. Miller, Dominik Brodowski,
Greg Kroah-Hartman, Kishon Vijay Abraham I, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald-Stadler, Jiri Slaby, Willy Tarreau
Hi Marek,
2018-09-24 13:38 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
> Hi Janusz,
>
> On 2018-09-24 13:08, Janusz Krzysztofik wrote:
>> 2018-09-24 11:43 GMT+02:00, Marek Szyprowski <m.szyprowski@samsung.com>:
>>> On 2018-09-24 01:53, Janusz Krzysztofik wrote:
>>>> While investigating possible reasons of GPIO fast bitmap processing
>>>> related boot hang on Samsung Snow Chromebook, reported by Marek
>>>> Szyprowski (thanks!), I've discovered one coding bug, addressed by
>>>> PATCH 1/2 of this series, and one potential regression introduced at
>>>> design level of the solution, hopefully fixed by PATCH 2/2. See
>>>> commit messages for details.
>>>>
>>>> Janusz Krzysztofik (2):
>>>> gpiolib: Fix missing updates of bitmap index
>>>> gpiolib: Fix array members of same chip processed separately
>>>>
>>>> The fixes should resolve the boot hang observed by Marek, however the
>>>> second change excludes that particular case from fast bitmap processing
>>>> and restores the old behaviour.
>>> I confirm, that the above 2 patches fixes boot issue on Samsung Snow
>>> Chromebook with next-20180920.
>>>
>>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>>>
>>>> Hence, it is possible still another
>>>> issue which have had an influence on that boot hang exists in the code.
>>>> In order to fully verify the fix, it would have to be tested on a
>>>> platform where an array of GPIO descriptors is used which starts from
>>>> at least two consecutive pins of one GPIO chip in hardware order,
>>>> starting ftom 0, followed by one or more pins belonging to other
>>>> chip(s).
>>>>
>>>> In order to verify if separate calls to .set() chip callback for each
>>>> pin instead of one call to .set_multiple() is actually the reason of
>>>> boot hang on Samsung Snow Chromebook, the affected driver -
>>>> drivers/mmc/core/pwrseq_simple.c - would have to be temporarily
>>>> modified for testing purposes so it calls gpiod_set_value() for each
>>>> pin instead of gpiod_set_array_value() for all of them. If that would
>>>> also result in boot hang, we could be sure the issue was really the
>>>> one addressed by the second fix. Marek, could you please try to
>>>> perform such test?
>>> Yes, I've just tested next-20180920 only with the first patch from this
>>> patchset and the mentioned change to drivers/mmc/core/pwrseq_simple.c.
>>> It boots fine, so indeed the issue is in handling of arrays of gpios.
>>>
>>> Just to be sure I did it right, this is my change to the mentioned file:
>> Yeah, that's what I had on mind. However, I'd be more lucky if it didn't
>> work
>> for you. Setting the pins sequentially, not simultaneously as before,
>> was
>> exactly what I hoped was the reason of the hang.
>>
>>> diff --git a/drivers/mmc/core/pwrseq_simple.c
>>> b/drivers/mmc/core/pwrseq_simple.c
>>> index 7f882a2bb872..9397dc1f2e38 100644
>>> --- a/drivers/mmc/core/pwrseq_simple.c
>>> +++ b/drivers/mmc/core/pwrseq_simple.c
>>> @@ -38,16 +38,11 @@ static void mmc_pwrseq_simple_set_gpios_value(struct
>>> mmc_pwrseq_simple *pwrseq,
>>> int value)
>>> {
>>> struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
>>> + int i;
>>>
>>> - if (!IS_ERR(reset_gpios)) {
>>> - DECLARE_BITMAP(values, BITS_PER_TYPE(value));
>>> - int nvalues = reset_gpios->ndescs;
>>> -
>>> - values[0] = value;
>>> -
>>> - gpiod_set_array_value_cansleep(nvalues,
>>> reset_gpios->desc,
>>> - reset_gpios->info,
>>> values);
>>> - }
>>> + if (!IS_ERR(reset_gpios))
>>> + for (i = 0; i < reset_gpios->ndescs; i++)
>> The only difference from the behaviour when the hang was occurring is now
>> the order the pins are manipulated. Maybe that matters?
>> Could you please retry the same with the order of pins reversed, either
>> in
>> the .dts file or here inside this for loop?
>
> I've switched the order of pins in dts and next-20180920 + first patch +
> above
> change also boots fine.
Thanks for performing those tests.
Since we are not able to reproduce the issue by any means other than
using the original code introduced by fast bitmap processing changes,
regardless of the first fix being applied or not, and we are only able to
resolve the hangup by excluding affected use case from the fast path,
we have to assume one or more bugs which affect mixed arrays, i.e.,
those which apply for fast bitmap processing only in part, may still exist
in the code introduced by the fast bitmap processing series. I hope we
are able to resolve it soon, before the changes reach mainline.
Thanks,
Janusz
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>
>
^ permalink raw reply [flat|nested] 75+ messages in thread
* [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit()
2018-09-23 23:53 ` [PATCH 1/2] gpiolib: Fix missing updates of bitmap index Janusz Krzysztofik
2018-09-24 8:11 ` Linus Walleij
@ 2018-09-29 12:20 ` Janusz Krzysztofik
2018-10-01 6:46 ` Marek Szyprowski
2018-10-01 9:37 ` Linus Walleij
1 sibling, 2 replies; 75+ messages in thread
From: Janusz Krzysztofik @ 2018-09-29 12:20 UTC (permalink / raw)
To: Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, Tony Lindgren, Dominik Brodowski,
Yegor Yefremov, netdev, linux-i2c, Peter Meerwald-Stadler,
Marek Szyprowski, devel, Florian Fainelli, Peter Rosin,
Janusz Krzysztofik, Krzysztof Kozlowski, Kishon Vijay Abraham I,
linux-iio, Peter Korsgaard, Geert Uytterhoeven, linux-serial,
Jiri Slaby, Michael Hennerich, Uwe Kleine-König, linux-gpio
Commit b17566a6b08b ("gpiolib: Implement fast processing path in
get/set array"), already fixed to some extent with commit 5d581d7e8cdc
("gpiolib: Fix missing updates of bitmap index"), introduced a new mode
of processing bitmaps where bits applicable for fast bitmap processing
path are supposed to be skipped while iterating bits which don't apply.
Unfortunately, find_next_zero_bit() function supposed to skip over
those fast bits is always called with a 'start' argument equal to an
index of last zero bit found and returns that index value again an
again, causing an infinite loop.
Fix it by incrementing the index uncoditionally before
find_next_zero_bit() is optionally called.
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
Marek,
Could you please test it on top of next-20180920 with "gpiolib: Fix
missing updates of bitmap index" and optionally "mmc: pwrseq_simple:
Fix incorrect handling of GPIO bitmap" also applied?
Thanks,
Janusz
drivers/gpio/gpiolib.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6ae13e3e05f1..940b543e966d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2878,12 +2878,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
int hwgpio = gpio_chip_hwgpio(desc);
__set_bit(hwgpio, mask);
+ i++;
if (array_info)
i = find_next_zero_bit(array_info->get_mask,
array_size, i);
- else
- i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
@@ -2903,12 +2902,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
value = !value;
__assign_bit(j, value_bitmap, value);
trace_gpio_value(desc_to_gpio(desc), 1, value);
+ j++;
if (array_info)
j = find_next_zero_bit(array_info->get_mask, i,
j);
- else
- j++;
}
if (mask != fastpath)
@@ -3191,12 +3189,11 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
__clear_bit(hwgpio, bits);
count++;
}
+ i++;
if (array_info)
i = find_next_zero_bit(array_info->set_mask,
array_size, i);
- else
- i++;
} while ((i < array_size) &&
(desc_array[i]->gdev->chip == chip));
/* push collected bits to outputs */
--
2.16.4
^ permalink raw reply related [flat|nested] 75+ messages in thread
* Re: [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit()
2018-09-29 12:20 ` [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit() Janusz Krzysztofik
@ 2018-10-01 6:46 ` Marek Szyprowski
2018-10-01 9:37 ` Linus Walleij
1 sibling, 0 replies; 75+ messages in thread
From: Marek Szyprowski @ 2018-10-01 6:46 UTC (permalink / raw)
To: Janusz Krzysztofik, Linus Walleij
Cc: Andrew Lunn, Ulf Hansson, Tony Lindgren, Dominik Brodowski,
Yegor Yefremov, netdev, linux-i2c, Peter Meerwald-Stadler, devel,
Florian Fainelli, Peter Rosin, Krzysztof Kozlowski,
Kishon Vijay Abraham I, linux-iio, Peter Korsgaard,
Geert Uytterhoeven, linux-serial, Jiri Slaby, Michael Hennerich,
Uwe Kleine-König, linux-gpio, Russell King,
Lars-Peter Clausen
Hi Janusz,
On 2018-09-29 14:20, Janusz Krzysztofik wrote:
> Commit b17566a6b08b ("gpiolib: Implement fast processing path in
> get/set array"), already fixed to some extent with commit 5d581d7e8cdc
> ("gpiolib: Fix missing updates of bitmap index"), introduced a new mode
> of processing bitmaps where bits applicable for fast bitmap processing
> path are supposed to be skipped while iterating bits which don't apply.
> Unfortunately, find_next_zero_bit() function supposed to skip over
> those fast bits is always called with a 'start' argument equal to an
> index of last zero bit found and returns that index value again an
> again, causing an infinite loop.
>
> Fix it by incrementing the index uncoditionally before
> find_next_zero_bit() is optionally called.
>
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
> Marek,
>
> Could you please test it on top of next-20180920 with "gpiolib: Fix
> missing updates of bitmap index" and optionally "mmc: pwrseq_simple:
> Fix incorrect handling of GPIO bitmap" also applied?
This patch finally fixes the boot issue on Samsung Chromebook Snow.
Thanks!
>
> Thanks,
> Janusz
>
>
> drivers/gpio/gpiolib.c | 9 +++------
> 1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 6ae13e3e05f1..940b543e966d 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -2878,12 +2878,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> int hwgpio = gpio_chip_hwgpio(desc);
>
> __set_bit(hwgpio, mask);
> + i++;
>
> if (array_info)
> i = find_next_zero_bit(array_info->get_mask,
> array_size, i);
> - else
> - i++;
> } while ((i < array_size) &&
> (desc_array[i]->gdev->chip == chip));
>
> @@ -2903,12 +2902,11 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> value = !value;
> __assign_bit(j, value_bitmap, value);
> trace_gpio_value(desc_to_gpio(desc), 1, value);
> + j++;
>
> if (array_info)
> j = find_next_zero_bit(array_info->get_mask, i,
> j);
> - else
> - j++;
> }
>
> if (mask != fastpath)
> @@ -3191,12 +3189,11 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
> __clear_bit(hwgpio, bits);
> count++;
> }
> + i++;
>
> if (array_info)
> i = find_next_zero_bit(array_info->set_mask,
> array_size, i);
> - else
> - i++;
> } while ((i < array_size) &&
> (desc_array[i]->gdev->chip == chip));
> /* push collected bits to outputs */
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
^ permalink raw reply [flat|nested] 75+ messages in thread
* Re: [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit()
2018-09-29 12:20 ` [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit() Janusz Krzysztofik
2018-10-01 6:46 ` Marek Szyprowski
@ 2018-10-01 9:37 ` Linus Walleij
1 sibling, 0 replies; 75+ messages in thread
From: Linus Walleij @ 2018-10-01 9:37 UTC (permalink / raw)
To: Janusz Krzysztofik
Cc: Miguel Ojeda Sandonis, Peter Korsgaard, Peter Rosin, Ulf Hansson,
Andrew Lunn, Florian Fainelli, David S. Miller,
Dominik Brodowski, Greg KH, kishon, Lars-Peter Clausen,
Michael Hennerich, Jonathan Cameron, Hartmut Knaack,
Peter Meerwald, Jiri Slaby, Willy Tarreau, Geert Uytterhoeven,
Sebastien Bourdelin, Lukas Wunner
On Sat, Sep 29, 2018 at 2:19 PM Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> Commit b17566a6b08b ("gpiolib: Implement fast processing path in
> get/set array"), already fixed to some extent with commit 5d581d7e8cdc
> ("gpiolib: Fix missing updates of bitmap index"), introduced a new mode
> of processing bitmaps where bits applicable for fast bitmap processing
> path are supposed to be skipped while iterating bits which don't apply.
> Unfortunately, find_next_zero_bit() function supposed to skip over
> those fast bits is always called with a 'start' argument equal to an
> index of last zero bit found and returns that index value again an
> again, causing an infinite loop.
>
> Fix it by incrementing the index uncoditionally before
> find_next_zero_bit() is optionally called.
>
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Patch applied with Marek's Tested-by.
Thanks to both of you for digging in and fixing this up!
Now we are in good shape for the v4.20 cycle :)
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 75+ messages in thread
end of thread, other threads:[~2018-10-01 16:14 UTC | newest]
Thread overview: 75+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20180813223448.21316-1-jmkrzyszt@gmail.com>
2018-08-20 23:43 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-21 6:49 ` Peter Rosin
2018-08-21 6:52 ` Peter Rosin
2018-08-29 12:03 ` Miguel Ojeda
2018-08-29 18:01 ` Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-08-20 23:43 ` [RFC RFT PATCH v4 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-08-29 9:06 ` [RFC RFT PATCH 0/4] gpiolib: speed up GPIO array processing Linus Walleij
2018-08-29 18:16 ` Janusz Krzysztofik
2018-08-29 10:19 ` Ulf Hansson
2018-08-29 20:48 ` [PATH v5 " Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-08-30 4:30 ` Peter Rosin
2018-08-30 7:40 ` Geert Uytterhoeven
2018-08-30 11:10 ` Miguel Ojeda
2018-08-30 15:35 ` David Laight
2018-09-02 10:19 ` Janusz Krzysztofik
2018-08-31 9:14 ` Linus Walleij
2018-08-29 20:48 ` [PATCH v5 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-08-29 20:48 ` [PATCH v5 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-08-29 20:49 ` [PATCH v5 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-08-31 22:56 ` [PATH v6 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-01 0:23 ` Peter Rosin
2018-09-04 15:28 ` kbuild test robot
2018-09-04 15:28 ` kbuild test robot
2018-08-31 22:56 ` [PATCH v6 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-08-31 22:56 ` [PATCH v6 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-04 15:27 ` kbuild test robot
2018-08-31 22:56 ` [PATCH v6 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-02 13:21 ` Lukas Wunner
2018-09-03 4:31 ` Matthew Wilcox
2018-09-03 14:24 ` Geert Uytterhoeven
2018-09-03 15:07 ` Geert Uytterhoeven
2018-09-04 15:29 ` kbuild test robot
2018-09-05 6:46 ` kbuild test robot
2018-09-02 12:01 ` [PATCH v7 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-09-02 12:01 ` [PATCH v7 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-03 14:21 ` Geert Uytterhoeven
2018-09-04 15:23 ` kbuild test robot
2018-09-05 7:11 ` kbuild test robot
2018-09-02 12:01 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
[not found] ` <CGME20180920101151eucas1p221f5a1715b8556bb9d99bf08fe09ce6f@eucas1p2.samsung.com>
2018-09-20 10:11 ` Marek Szyprowski
2018-09-20 15:48 ` Janusz Krzysztofik
2018-09-20 16:21 ` Janusz Krzysztofik
2018-09-21 8:18 ` Marek Szyprowski
2018-09-21 10:51 ` Janusz Krzysztofik
2018-09-21 11:26 ` Janusz Krzysztofik
2018-09-21 14:14 ` Marek Szyprowski
2018-09-23 10:43 ` Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Janusz Krzysztofik
2018-09-23 23:53 ` [PATCH 1/2] gpiolib: Fix missing updates of bitmap index Janusz Krzysztofik
2018-09-24 8:11 ` Linus Walleij
2018-09-29 12:20 ` [PATCH] gpiolib: Fix incorrect use of find_next_zero_bit() Janusz Krzysztofik
2018-10-01 6:46 ` Marek Szyprowski
2018-10-01 9:37 ` Linus Walleij
2018-09-23 23:53 ` [PATCH 2/2] gpiolib: Fix array members of same chip processed separately Janusz Krzysztofik
2018-09-24 8:13 ` Linus Walleij
2018-09-24 9:43 ` [PATCH 0/2] gpiolib: Fix issues introduced by fast bitmap processing path Marek Szyprowski
2018-09-24 11:08 ` Janusz Krzysztofik
2018-09-24 11:38 ` Marek Szyprowski
2018-09-24 14:18 ` Janusz Krzysztofik
2018-09-20 18:05 ` [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array Dan Carpenter
2018-09-20 15:49 ` Linus Walleij
2018-09-05 21:50 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 2/4] gpiolib: Identify arrays matching GPIO hardware Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 3/4] gpiolib: Pass array info to get/set array functions Janusz Krzysztofik
2018-09-05 21:50 ` [PATCH v8 4/4] gpiolib: Implement fast processing path in get/set array Janusz Krzysztofik
2018-09-13 9:22 ` [PATCH v8 0/4] gpiolib: speed up GPIO array processing Linus Walleij
2018-09-19 18:08 ` Linus Walleij
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