* [PATCH v4 1/3] spi: spi-mem: add automatic poll status functions
2021-05-18 13:43 [PATCH v4 0/3] MTD: spinand: Add spi_mem_poll_status() support patrice.chotard
@ 2021-05-18 13:43 ` patrice.chotard
2021-05-18 14:12 ` Boris Brezillon
2021-05-18 13:43 ` [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs patrice.chotard
2021-05-18 13:43 ` [PATCH v4 3/3] spi: stm32-qspi: add automatic poll status feature patrice.chotard
2 siblings, 1 reply; 11+ messages in thread
From: patrice.chotard @ 2021-05-18 13:43 UTC (permalink / raw)
To: Mark Brown, Miquel Raynal, Vignesh Raghavendra, Boris Brezillon,
linux-mtd, Alexandre Torgue, linux-spi, linux-stm32,
linux-arm-kernel, linux-kernel
Cc: patrice.chotard, christophe.kerello
From: Patrice Chotard <patrice.chotard@foss.st.com>
With STM32 QSPI, it is possible to poll the status register of the device.
This could be done to offload the CPU during an operation (erase or
program a SPI NAND for example).
spi_mem_poll_status API has been added to handle this feature.
This new function take care of the offload/non-offload cases.
For the non-offload case, use read_poll_timeout() to poll the status in
order to release CPU during this phase.
For example, previously, when erasing large area, in non-offload case,
CPU load can reach ~50%, now it decrease to ~35%.
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
---
Changes in v4:
- Remove init_completion() from spi_mem_probe() added in v2.
- Add missing static for spi_mem_read_status().
- Check if operation in spi_mem_poll_status() is a READ.
Changes in v3:
- Add spi_mem_read_status() which allows to read 8 or 16 bits status.
- Add initial_delay_us and polling_delay_us parameters to spi_mem_poll_status()
and also to poll_status() callback.
- Move spi_mem_supports_op() in SW-based polling case.
- Add delay before invoking read_poll_timeout().
- Remove the reinit/wait_for_completion() added in v2.
Changes in v2:
- Indicates the spi_mem_poll_status() timeout unit
- Use 2-byte wide status register
- Add spi_mem_supports_op() call in spi_mem_poll_status()
- Add completion management in spi_mem_poll_status()
- Add offload/non-offload case management in spi_mem_poll_status()
- Optimize the non-offload case by using read_poll_timeout()
drivers/spi/spi-mem.c | 85 +++++++++++++++++++++++++++++++++++++
include/linux/spi/spi-mem.h | 14 ++++++
2 files changed, 99 insertions(+)
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 1513553e4080..97c7a83686c7 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -6,6 +6,7 @@
* Author: Boris Brezillon <boris.brezillon@bootlin.com>
*/
#include <linux/dmaengine.h>
+#include <linux/iopoll.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
@@ -743,6 +744,90 @@ static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv)
return container_of(drv, struct spi_mem_driver, spidrv.driver);
}
+static int spi_mem_read_status(struct spi_mem *mem,
+ const struct spi_mem_op *op,
+ u16 *status)
+{
+ const u8 *bytes = (u8 *)op->data.buf.in;
+ int ret;
+
+ ret = spi_mem_exec_op(mem, op);
+ if (ret)
+ return ret;
+
+ if (op->data.nbytes > 1)
+ *status = ((u16)bytes[0] << 8) | bytes[1];
+ else
+ *status = bytes[0];
+
+ return 0;
+}
+
+/**
+ * spi_mem_poll_status() - Poll memory device status
+ * @mem: SPI memory device
+ * @op: the memory operation to execute
+ * @mask: status bitmask to ckeck
+ * @match: (status & mask) expected value
+ * @initial_delay_us: delay in us before starting to poll
+ * @polling_delay_us: time to sleep between reads in us
+ * @timeout_ms: timeout in milliseconds
+ *
+ * This function send a polling status request to the controller driver
+ *
+ * Return: 0 in case of success, -ETIMEDOUT in case of error,
+ * -EOPNOTSUPP if not supported.
+ */
+int spi_mem_poll_status(struct spi_mem *mem,
+ const struct spi_mem_op *op,
+ u16 mask, u16 match,
+ unsigned long initial_delay_us,
+ unsigned long polling_delay_us,
+ u16 timeout_ms)
+{
+ struct spi_controller *ctlr = mem->spi->controller;
+ int ret = -EOPNOTSUPP;
+ int read_status_ret;
+ u16 status;
+
+ if (op->data.nbytes < 1 || op->data.nbytes > 2 ||
+ op->data.dir != SPI_MEM_DATA_IN)
+ return (-EINVAL);
+
+ if (ctlr->mem_ops && ctlr->mem_ops->poll_status) {
+ ret = spi_mem_access_start(mem);
+ if (ret)
+ return ret;
+
+ ret = ctlr->mem_ops->poll_status(mem, op, mask, match,
+ initial_delay_us, polling_delay_us,
+ timeout_ms);
+
+ spi_mem_access_end(mem);
+ }
+
+ if (ret == -EOPNOTSUPP) {
+ if (!spi_mem_supports_op(mem, op))
+ return ret;
+
+ if (initial_delay_us < 10)
+ udelay(initial_delay_us);
+ else
+ usleep_range((initial_delay_us >> 2) + 1,
+ initial_delay_us);
+
+ ret = read_poll_timeout(spi_mem_read_status, read_status_ret,
+ (read_status_ret || ((status) & mask) == match),
+ polling_delay_us, timeout_ms * 1000, false, mem,
+ op, &status);
+ if (read_status_ret)
+ return read_status_ret;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(spi_mem_poll_status);
+
static int spi_mem_probe(struct spi_device *spi)
{
struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver);
diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index 2b65c9edc34e..10375d9ad747 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -250,6 +250,7 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
* the currently mapped area), and the caller of
* spi_mem_dirmap_write() is responsible for calling it again in
* this case.
+ * @poll_status: poll memory device status
*
* This interface should be implemented by SPI controllers providing an
* high-level interface to execute SPI memory operation, which is usually the
@@ -274,6 +275,12 @@ struct spi_controller_mem_ops {
u64 offs, size_t len, void *buf);
ssize_t (*dirmap_write)(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, const void *buf);
+ int (*poll_status)(struct spi_mem *mem,
+ const struct spi_mem_op *op,
+ u16 mask, u16 match,
+ unsigned long initial_delay_us,
+ unsigned long polling_rate_us,
+ unsigned long timeout_ms);
};
/**
@@ -369,6 +376,13 @@ devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,
void devm_spi_mem_dirmap_destroy(struct device *dev,
struct spi_mem_dirmap_desc *desc);
+int spi_mem_poll_status(struct spi_mem *mem,
+ const struct spi_mem_op *op,
+ u16 mask, u16 match,
+ unsigned long initial_delay_us,
+ unsigned long polling_delay_us,
+ u16 timeout);
+
int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
struct module *owner);
--
2.17.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH v4 1/3] spi: spi-mem: add automatic poll status functions
2021-05-18 13:43 ` [PATCH v4 1/3] spi: spi-mem: add automatic poll status functions patrice.chotard
@ 2021-05-18 14:12 ` Boris Brezillon
2021-05-18 14:33 ` Patrice CHOTARD
0 siblings, 1 reply; 11+ messages in thread
From: Boris Brezillon @ 2021-05-18 14:12 UTC (permalink / raw)
To: patrice.chotard
Cc: Mark Brown, Miquel Raynal, Vignesh Raghavendra, linux-mtd,
Alexandre Torgue, linux-spi, linux-stm32, linux-arm-kernel,
linux-kernel, christophe.kerello
On Tue, 18 May 2021 15:43:30 +0200
<patrice.chotard@foss.st.com> wrote:
> From: Patrice Chotard <patrice.chotard@foss.st.com>
>
> With STM32 QSPI, it is possible to poll the status register of the device.
> This could be done to offload the CPU during an operation (erase or
> program a SPI NAND for example).
>
> spi_mem_poll_status API has been added to handle this feature.
> This new function take care of the offload/non-offload cases.
>
> For the non-offload case, use read_poll_timeout() to poll the status in
> order to release CPU during this phase.
> For example, previously, when erasing large area, in non-offload case,
> CPU load can reach ~50%, now it decrease to ~35%.
>
> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
> ---
> Changes in v4:
> - Remove init_completion() from spi_mem_probe() added in v2.
> - Add missing static for spi_mem_read_status().
> - Check if operation in spi_mem_poll_status() is a READ.
>
> Changes in v3:
> - Add spi_mem_read_status() which allows to read 8 or 16 bits status.
> - Add initial_delay_us and polling_delay_us parameters to spi_mem_poll_status()
> and also to poll_status() callback.
> - Move spi_mem_supports_op() in SW-based polling case.
> - Add delay before invoking read_poll_timeout().
> - Remove the reinit/wait_for_completion() added in v2.
>
> Changes in v2:
> - Indicates the spi_mem_poll_status() timeout unit
> - Use 2-byte wide status register
> - Add spi_mem_supports_op() call in spi_mem_poll_status()
> - Add completion management in spi_mem_poll_status()
> - Add offload/non-offload case management in spi_mem_poll_status()
> - Optimize the non-offload case by using read_poll_timeout()
>
> drivers/spi/spi-mem.c | 85 +++++++++++++++++++++++++++++++++++++
> include/linux/spi/spi-mem.h | 14 ++++++
> 2 files changed, 99 insertions(+)
>
> diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
> index 1513553e4080..97c7a83686c7 100644
> --- a/drivers/spi/spi-mem.c
> +++ b/drivers/spi/spi-mem.c
> @@ -6,6 +6,7 @@
> * Author: Boris Brezillon <boris.brezillon@bootlin.com>
> */
> #include <linux/dmaengine.h>
> +#include <linux/iopoll.h>
> #include <linux/pm_runtime.h>
> #include <linux/spi/spi.h>
> #include <linux/spi/spi-mem.h>
> @@ -743,6 +744,90 @@ static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv)
> return container_of(drv, struct spi_mem_driver, spidrv.driver);
> }
>
> +static int spi_mem_read_status(struct spi_mem *mem,
> + const struct spi_mem_op *op,
> + u16 *status)
> +{
> + const u8 *bytes = (u8 *)op->data.buf.in;
> + int ret;
> +
> + ret = spi_mem_exec_op(mem, op);
> + if (ret)
> + return ret;
> +
> + if (op->data.nbytes > 1)
> + *status = ((u16)bytes[0] << 8) | bytes[1];
> + else
> + *status = bytes[0];
> +
> + return 0;
> +}
> +
> +/**
> + * spi_mem_poll_status() - Poll memory device status
> + * @mem: SPI memory device
> + * @op: the memory operation to execute
> + * @mask: status bitmask to ckeck
> + * @match: (status & mask) expected value
> + * @initial_delay_us: delay in us before starting to poll
> + * @polling_delay_us: time to sleep between reads in us
> + * @timeout_ms: timeout in milliseconds
> + *
> + * This function send a polling status request to the controller driver
"
This function polls a status register and returns when
(status & mask) == match or when the timeout has expired.
"
> + *
> + * Return: 0 in case of success, -ETIMEDOUT in case of error,
> + * -EOPNOTSUPP if not supported.
> + */
> +int spi_mem_poll_status(struct spi_mem *mem,
> + const struct spi_mem_op *op,
> + u16 mask, u16 match,
> + unsigned long initial_delay_us,
> + unsigned long polling_delay_us,
> + u16 timeout_ms)
> +{
> + struct spi_controller *ctlr = mem->spi->controller;
> + int ret = -EOPNOTSUPP;
> + int read_status_ret;
> + u16 status;
> +
> + if (op->data.nbytes < 1 || op->data.nbytes > 2 ||
> + op->data.dir != SPI_MEM_DATA_IN)
> + return (-EINVAL);
s/return (-EINVAL);/return -EINVAL;/
[...]
> /**
> @@ -369,6 +376,13 @@ devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,
> void devm_spi_mem_dirmap_destroy(struct device *dev,
> struct spi_mem_dirmap_desc *desc);
>
> +int spi_mem_poll_status(struct spi_mem *mem,
> + const struct spi_mem_op *op,
> + u16 mask, u16 match,
> + unsigned long initial_delay_us,
> + unsigned long polling_delay_us,
> + u16 timeout);
s/timeout/timeout_ms/.
With those minor things fixed
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
> +
> int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
> struct module *owner);
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v4 1/3] spi: spi-mem: add automatic poll status functions
2021-05-18 14:12 ` Boris Brezillon
@ 2021-05-18 14:33 ` Patrice CHOTARD
0 siblings, 0 replies; 11+ messages in thread
From: Patrice CHOTARD @ 2021-05-18 14:33 UTC (permalink / raw)
To: Boris Brezillon
Cc: Mark Brown, Miquel Raynal, Vignesh Raghavendra, linux-mtd,
Alexandre Torgue, linux-spi, linux-stm32, linux-arm-kernel,
linux-kernel, christophe.kerello
On 5/18/21 4:12 PM, Boris Brezillon wrote:
> On Tue, 18 May 2021 15:43:30 +0200
> <patrice.chotard@foss.st.com> wrote:
>
>> From: Patrice Chotard <patrice.chotard@foss.st.com>
>>
>> With STM32 QSPI, it is possible to poll the status register of the device.
>> This could be done to offload the CPU during an operation (erase or
>> program a SPI NAND for example).
>>
>> spi_mem_poll_status API has been added to handle this feature.
>> This new function take care of the offload/non-offload cases.
>>
>> For the non-offload case, use read_poll_timeout() to poll the status in
>> order to release CPU during this phase.
>> For example, previously, when erasing large area, in non-offload case,
>> CPU load can reach ~50%, now it decrease to ~35%.
>>
>> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
>> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
>> ---
>> Changes in v4:
>> - Remove init_completion() from spi_mem_probe() added in v2.
>> - Add missing static for spi_mem_read_status().
>> - Check if operation in spi_mem_poll_status() is a READ.
>>
>> Changes in v3:
>> - Add spi_mem_read_status() which allows to read 8 or 16 bits status.
>> - Add initial_delay_us and polling_delay_us parameters to spi_mem_poll_status()
>> and also to poll_status() callback.
>> - Move spi_mem_supports_op() in SW-based polling case.
>> - Add delay before invoking read_poll_timeout().
>> - Remove the reinit/wait_for_completion() added in v2.
>>
>> Changes in v2:
>> - Indicates the spi_mem_poll_status() timeout unit
>> - Use 2-byte wide status register
>> - Add spi_mem_supports_op() call in spi_mem_poll_status()
>> - Add completion management in spi_mem_poll_status()
>> - Add offload/non-offload case management in spi_mem_poll_status()
>> - Optimize the non-offload case by using read_poll_timeout()
>>
>> drivers/spi/spi-mem.c | 85 +++++++++++++++++++++++++++++++++++++
>> include/linux/spi/spi-mem.h | 14 ++++++
>> 2 files changed, 99 insertions(+)
>>
>> diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
>> index 1513553e4080..97c7a83686c7 100644
>> --- a/drivers/spi/spi-mem.c
>> +++ b/drivers/spi/spi-mem.c
>> @@ -6,6 +6,7 @@
>> * Author: Boris Brezillon <boris.brezillon@bootlin.com>
>> */
>> #include <linux/dmaengine.h>
>> +#include <linux/iopoll.h>
>> #include <linux/pm_runtime.h>
>> #include <linux/spi/spi.h>
>> #include <linux/spi/spi-mem.h>
>> @@ -743,6 +744,90 @@ static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv)
>> return container_of(drv, struct spi_mem_driver, spidrv.driver);
>> }
>>
>> +static int spi_mem_read_status(struct spi_mem *mem,
>> + const struct spi_mem_op *op,
>> + u16 *status)
>> +{
>> + const u8 *bytes = (u8 *)op->data.buf.in;
>> + int ret;
>> +
>> + ret = spi_mem_exec_op(mem, op);
>> + if (ret)
>> + return ret;
>> +
>> + if (op->data.nbytes > 1)
>> + *status = ((u16)bytes[0] << 8) | bytes[1];
>> + else
>> + *status = bytes[0];
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * spi_mem_poll_status() - Poll memory device status
>> + * @mem: SPI memory device
>> + * @op: the memory operation to execute
>> + * @mask: status bitmask to ckeck
>> + * @match: (status & mask) expected value
>> + * @initial_delay_us: delay in us before starting to poll
>> + * @polling_delay_us: time to sleep between reads in us
>> + * @timeout_ms: timeout in milliseconds
>> + *
>> + * This function send a polling status request to the controller driver
>
> "
> This function polls a status register and returns when
> (status & mask) == match or when the timeout has expired.
> "
Ok i will update spi_mem_poll_status description
>
>> + *
>> + * Return: 0 in case of success, -ETIMEDOUT in case of error,
>> + * -EOPNOTSUPP if not supported.
>> + */
>> +int spi_mem_poll_status(struct spi_mem *mem,
>> + const struct spi_mem_op *op,
>> + u16 mask, u16 match,
>> + unsigned long initial_delay_us,
>> + unsigned long polling_delay_us,
>> + u16 timeout_ms)
>> +{
>> + struct spi_controller *ctlr = mem->spi->controller;
>> + int ret = -EOPNOTSUPP;
>> + int read_status_ret;
>> + u16 status;
>> +
>> + if (op->data.nbytes < 1 || op->data.nbytes > 2 ||
>> + op->data.dir != SPI_MEM_DATA_IN)
>> + return (-EINVAL);
>
> s/return (-EINVAL);/return -EINVAL;/
Ok
>
>
> [...]
>
>> /**
>> @@ -369,6 +376,13 @@ devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,
>> void devm_spi_mem_dirmap_destroy(struct device *dev,
>> struct spi_mem_dirmap_desc *desc);
>>
>> +int spi_mem_poll_status(struct spi_mem *mem,
>> + const struct spi_mem_op *op,
>> + u16 mask, u16 match,
>> + unsigned long initial_delay_us,
>> + unsigned long polling_delay_us,
>> + u16 timeout);
>
> s/timeout/timeout_ms/.
Ok
>
> With those minor things fixed
>
> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Thanks
Patrice
>
>> +
>> int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
>> struct module *owner);
>>
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs
2021-05-18 13:43 [PATCH v4 0/3] MTD: spinand: Add spi_mem_poll_status() support patrice.chotard
2021-05-18 13:43 ` [PATCH v4 1/3] spi: spi-mem: add automatic poll status functions patrice.chotard
@ 2021-05-18 13:43 ` patrice.chotard
2021-05-18 14:18 ` Boris Brezillon
2021-05-18 14:19 ` Boris Brezillon
2021-05-18 13:43 ` [PATCH v4 3/3] spi: stm32-qspi: add automatic poll status feature patrice.chotard
2 siblings, 2 replies; 11+ messages in thread
From: patrice.chotard @ 2021-05-18 13:43 UTC (permalink / raw)
To: Mark Brown, Miquel Raynal, Vignesh Raghavendra, Boris Brezillon,
linux-mtd, Alexandre Torgue, linux-spi, linux-stm32,
linux-arm-kernel, linux-kernel
Cc: patrice.chotard, christophe.kerello
From: Patrice Chotard <patrice.chotard@foss.st.com>
Make use of spi-mem poll status APIs to let advanced controllers
optimize wait operations.
This should also fix the high CPU usage for system that don't have
a dedicated STATUS poll block logic.
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
---
Changes in v4:
- Update commit message.
- Add comment which explains how delays has been calculated.
- Rename SPINAND_STATUS_TIMEOUT_MS to SPINAND_WAITRDY_TIMEOUT_MS.
Changes in v3:
- Add initial_delay_us and polling_delay_us parameters to spinand_wait()
- Add SPINAND_READ/WRITE/ERASE/RESET_INITIAL_DELAY_US and
SPINAND_READ/WRITE/ERASE/RESET_POLL_DELAY_US defines.
Changes in v2:
- non-offload case is now managed by spi_mem_poll_status()
drivers/mtd/nand/spi/core.c | 45 ++++++++++++++++++++++++++-----------
include/linux/mtd/spinand.h | 22 ++++++++++++++++++
2 files changed, 54 insertions(+), 13 deletions(-)
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 17f63f95f4a2..3131fae0c715 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -473,20 +473,26 @@ static int spinand_erase_op(struct spinand_device *spinand,
return spi_mem_exec_op(spinand->spimem, &op);
}
-static int spinand_wait(struct spinand_device *spinand, u8 *s)
+static int spinand_wait(struct spinand_device *spinand,
+ unsigned long initial_delay_us,
+ unsigned long poll_delay_us,
+ u8 *s)
{
- unsigned long timeo = jiffies + msecs_to_jiffies(400);
+ struct spi_mem_op op = SPINAND_GET_FEATURE_OP(REG_STATUS,
+ spinand->scratchbuf);
u8 status;
int ret;
- do {
- ret = spinand_read_status(spinand, &status);
- if (ret)
- return ret;
+ ret = spi_mem_poll_status(spinand->spimem, &op, STATUS_BUSY, 0,
+ initial_delay_us,
+ poll_delay_us,
+ SPINAND_WAITRDY_TIMEOUT_MS);
+ if (ret)
+ return ret;
- if (!(status & STATUS_BUSY))
- goto out;
- } while (time_before(jiffies, timeo));
+ status = *spinand->scratchbuf;
+ if (!(status & STATUS_BUSY))
+ goto out;
/*
* Extra read, just in case the STATUS_READY bit has changed
@@ -526,7 +532,10 @@ static int spinand_reset_op(struct spinand_device *spinand)
if (ret)
return ret;
- return spinand_wait(spinand, NULL);
+ return spinand_wait(spinand,
+ SPINAND_RESET_INITIAL_DELAY_US,
+ SPINAND_RESET_POLL_DELAY_US,
+ NULL);
}
static int spinand_lock_block(struct spinand_device *spinand, u8 lock)
@@ -549,7 +558,10 @@ static int spinand_read_page(struct spinand_device *spinand,
if (ret)
return ret;
- ret = spinand_wait(spinand, &status);
+ ret = spinand_wait(spinand,
+ SPINAND_READ_INITIAL_DELAY_US,
+ SPINAND_READ_POLL_DELAY_US,
+ &status);
if (ret < 0)
return ret;
@@ -585,7 +597,10 @@ static int spinand_write_page(struct spinand_device *spinand,
if (ret)
return ret;
- ret = spinand_wait(spinand, &status);
+ ret = spinand_wait(spinand,
+ SPINAND_WRITE_INITIAL_DELAY_US,
+ SPINAND_WRITE_POLL_DELAY_US,
+ &status);
if (!ret && (status & STATUS_PROG_FAILED))
return -EIO;
@@ -768,7 +783,11 @@ static int spinand_erase(struct nand_device *nand, const struct nand_pos *pos)
if (ret)
return ret;
- ret = spinand_wait(spinand, &status);
+ ret = spinand_wait(spinand,
+ SPINAND_ERASE_INITIAL_DELAY_US,
+ SPINAND_ERASE_POLL_DELAY_US,
+ &status);
+
if (!ret && (status & STATUS_ERASE_FAILED))
ret = -EIO;
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 6bb92f26833e..6988956b8492 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -170,6 +170,28 @@ struct spinand_op;
struct spinand_device;
#define SPINAND_MAX_ID_LEN 4
+/*
+ * For erase, write and read operation, we got the following timings :
+ * tBERS (erase) 1ms to 4ms
+ * tPROG 300us to 400us
+ * tREAD 25us to 100us
+ * In order to minimize latency, the min value is divided by 4 for the
+ * initial delay, and dividing by 20 for the poll delay.
+ * For reset, 5us/10us/500us if the device is respectively
+ * reading/programming/erasing when the RESET occurs. Since we always
+ * issue a RESET when the device is IDLE, 5us is selected for both initial
+ * and poll delay.
+ */
+#define SPINAND_READ_INITIAL_DELAY_US 6
+#define SPINAND_READ_POLL_DELAY_US 5
+#define SPINAND_RESET_INITIAL_DELAY_US 5
+#define SPINAND_RESET_POLL_DELAY_US 5
+#define SPINAND_WRITE_INITIAL_DELAY_US 75
+#define SPINAND_WRITE_POLL_DELAY_US 15
+#define SPINAND_ERASE_INITIAL_DELAY_US 250
+#define SPINAND_ERASE_POLL_DELAY_US 50
+
+#define SPINAND_WAITRDY_TIMEOUT_MS 400
/**
* struct spinand_id - SPI NAND id structure
--
2.17.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs
2021-05-18 13:43 ` [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs patrice.chotard
@ 2021-05-18 14:18 ` Boris Brezillon
2021-05-18 14:34 ` Patrice CHOTARD
2021-05-18 14:19 ` Boris Brezillon
1 sibling, 1 reply; 11+ messages in thread
From: Boris Brezillon @ 2021-05-18 14:18 UTC (permalink / raw)
To: patrice.chotard
Cc: Mark Brown, Miquel Raynal, Vignesh Raghavendra, linux-mtd,
Alexandre Torgue, linux-spi, linux-stm32, linux-arm-kernel,
linux-kernel, christophe.kerello
On Tue, 18 May 2021 15:43:31 +0200
<patrice.chotard@foss.st.com> wrote:
> From: Patrice Chotard <patrice.chotard@foss.st.com>
>
> Make use of spi-mem poll status APIs to let advanced controllers
> optimize wait operations.
> This should also fix the high CPU usage for system that don't have
> a dedicated STATUS poll block logic.
>
> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
> ---
> Changes in v4:
> - Update commit message.
> - Add comment which explains how delays has been calculated.
> - Rename SPINAND_STATUS_TIMEOUT_MS to SPINAND_WAITRDY_TIMEOUT_MS.
>
> Changes in v3:
> - Add initial_delay_us and polling_delay_us parameters to spinand_wait()
> - Add SPINAND_READ/WRITE/ERASE/RESET_INITIAL_DELAY_US and
> SPINAND_READ/WRITE/ERASE/RESET_POLL_DELAY_US defines.
>
> Changes in v2:
> - non-offload case is now managed by spi_mem_poll_status()
>
> drivers/mtd/nand/spi/core.c | 45 ++++++++++++++++++++++++++-----------
> include/linux/mtd/spinand.h | 22 ++++++++++++++++++
> 2 files changed, 54 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index 17f63f95f4a2..3131fae0c715 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -473,20 +473,26 @@ static int spinand_erase_op(struct spinand_device *spinand,
> return spi_mem_exec_op(spinand->spimem, &op);
> }
>
> -static int spinand_wait(struct spinand_device *spinand, u8 *s)
> +static int spinand_wait(struct spinand_device *spinand,
> + unsigned long initial_delay_us,
> + unsigned long poll_delay_us,
> + u8 *s)
> {
> - unsigned long timeo = jiffies + msecs_to_jiffies(400);
> + struct spi_mem_op op = SPINAND_GET_FEATURE_OP(REG_STATUS,
> + spinand->scratchbuf);
> u8 status;
> int ret;
>
> - do {
> - ret = spinand_read_status(spinand, &status);
> - if (ret)
> - return ret;
> + ret = spi_mem_poll_status(spinand->spimem, &op, STATUS_BUSY, 0,
> + initial_delay_us,
> + poll_delay_us,
> + SPINAND_WAITRDY_TIMEOUT_MS);
> + if (ret)
> + return ret;
>
> - if (!(status & STATUS_BUSY))
> - goto out;
> - } while (time_before(jiffies, timeo));
> + status = *spinand->scratchbuf;
> + if (!(status & STATUS_BUSY))
> + goto out;
Looks like you expect the driver to not only wait for a status change
but also fill the data buffer with the last status value. I think that
should be documented in the SPI mem API.
> /*
> * Extra read, just in case the STATUS_READY bit has changed
> @@ -526,7 +532,10 @@ static int spinand_reset_op(struct spinand_device *spinand)
> if (ret)
> return ret;
>
> - return spinand_wait(spinand, NULL);
> + return spinand_wait(spinand,
> + SPINAND_RESET_INITIAL_DELAY_US,
> + SPINAND_RESET_POLL_DELAY_US,
> + NULL);
> }
>
> static int spinand_lock_block(struct spinand_device *spinand, u8 lock)
> @@ -549,7 +558,10 @@ static int spinand_read_page(struct spinand_device *spinand,
> if (ret)
> return ret;
>
> - ret = spinand_wait(spinand, &status);
> + ret = spinand_wait(spinand,
> + SPINAND_READ_INITIAL_DELAY_US,
> + SPINAND_READ_POLL_DELAY_US,
> + &status);
> if (ret < 0)
> return ret;
>
> @@ -585,7 +597,10 @@ static int spinand_write_page(struct spinand_device *spinand,
> if (ret)
> return ret;
>
> - ret = spinand_wait(spinand, &status);
> + ret = spinand_wait(spinand,
> + SPINAND_WRITE_INITIAL_DELAY_US,
> + SPINAND_WRITE_POLL_DELAY_US,
> + &status);
> if (!ret && (status & STATUS_PROG_FAILED))
> return -EIO;
>
> @@ -768,7 +783,11 @@ static int spinand_erase(struct nand_device *nand, const struct nand_pos *pos)
> if (ret)
> return ret;
>
> - ret = spinand_wait(spinand, &status);
> + ret = spinand_wait(spinand,
> + SPINAND_ERASE_INITIAL_DELAY_US,
> + SPINAND_ERASE_POLL_DELAY_US,
> + &status);
> +
> if (!ret && (status & STATUS_ERASE_FAILED))
> ret = -EIO;
>
> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
> index 6bb92f26833e..6988956b8492 100644
> --- a/include/linux/mtd/spinand.h
> +++ b/include/linux/mtd/spinand.h
> @@ -170,6 +170,28 @@ struct spinand_op;
> struct spinand_device;
>
> #define SPINAND_MAX_ID_LEN 4
> +/*
> + * For erase, write and read operation, we got the following timings :
> + * tBERS (erase) 1ms to 4ms
> + * tPROG 300us to 400us
> + * tREAD 25us to 100us
> + * In order to minimize latency, the min value is divided by 4 for the
> + * initial delay, and dividing by 20 for the poll delay.
> + * For reset, 5us/10us/500us if the device is respectively
> + * reading/programming/erasing when the RESET occurs. Since we always
> + * issue a RESET when the device is IDLE, 5us is selected for both initial
> + * and poll delay.
> + */
> +#define SPINAND_READ_INITIAL_DELAY_US 6
> +#define SPINAND_READ_POLL_DELAY_US 5
> +#define SPINAND_RESET_INITIAL_DELAY_US 5
> +#define SPINAND_RESET_POLL_DELAY_US 5
> +#define SPINAND_WRITE_INITIAL_DELAY_US 75
> +#define SPINAND_WRITE_POLL_DELAY_US 15
> +#define SPINAND_ERASE_INITIAL_DELAY_US 250
> +#define SPINAND_ERASE_POLL_DELAY_US 50
> +
> +#define SPINAND_WAITRDY_TIMEOUT_MS 400
>
> /**
> * struct spinand_id - SPI NAND id structure
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs
2021-05-18 14:18 ` Boris Brezillon
@ 2021-05-18 14:34 ` Patrice CHOTARD
0 siblings, 0 replies; 11+ messages in thread
From: Patrice CHOTARD @ 2021-05-18 14:34 UTC (permalink / raw)
To: Boris Brezillon
Cc: Mark Brown, Miquel Raynal, Vignesh Raghavendra, linux-mtd,
Alexandre Torgue, linux-spi, linux-stm32, linux-arm-kernel,
linux-kernel, christophe.kerello
On 5/18/21 4:18 PM, Boris Brezillon wrote:
> On Tue, 18 May 2021 15:43:31 +0200
> <patrice.chotard@foss.st.com> wrote:
>
>> From: Patrice Chotard <patrice.chotard@foss.st.com>
>>
>> Make use of spi-mem poll status APIs to let advanced controllers
>> optimize wait operations.
>> This should also fix the high CPU usage for system that don't have
>> a dedicated STATUS poll block logic.
>>
>> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
>> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
>> ---
>> Changes in v4:
>> - Update commit message.
>> - Add comment which explains how delays has been calculated.
>> - Rename SPINAND_STATUS_TIMEOUT_MS to SPINAND_WAITRDY_TIMEOUT_MS.
>>
>> Changes in v3:
>> - Add initial_delay_us and polling_delay_us parameters to spinand_wait()
>> - Add SPINAND_READ/WRITE/ERASE/RESET_INITIAL_DELAY_US and
>> SPINAND_READ/WRITE/ERASE/RESET_POLL_DELAY_US defines.
>>
>> Changes in v2:
>> - non-offload case is now managed by spi_mem_poll_status()
>>
>> drivers/mtd/nand/spi/core.c | 45 ++++++++++++++++++++++++++-----------
>> include/linux/mtd/spinand.h | 22 ++++++++++++++++++
>> 2 files changed, 54 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
>> index 17f63f95f4a2..3131fae0c715 100644
>> --- a/drivers/mtd/nand/spi/core.c
>> +++ b/drivers/mtd/nand/spi/core.c
>> @@ -473,20 +473,26 @@ static int spinand_erase_op(struct spinand_device *spinand,
>> return spi_mem_exec_op(spinand->spimem, &op);
>> }
>>
>> -static int spinand_wait(struct spinand_device *spinand, u8 *s)
>> +static int spinand_wait(struct spinand_device *spinand,
>> + unsigned long initial_delay_us,
>> + unsigned long poll_delay_us,
>> + u8 *s)
>> {
>> - unsigned long timeo = jiffies + msecs_to_jiffies(400);
>> + struct spi_mem_op op = SPINAND_GET_FEATURE_OP(REG_STATUS,
>> + spinand->scratchbuf);
>> u8 status;
>> int ret;
>>
>> - do {
>> - ret = spinand_read_status(spinand, &status);
>> - if (ret)
>> - return ret;
>> + ret = spi_mem_poll_status(spinand->spimem, &op, STATUS_BUSY, 0,
>> + initial_delay_us,
>> + poll_delay_us,
>> + SPINAND_WAITRDY_TIMEOUT_MS);
>> + if (ret)
>> + return ret;
>>
>> - if (!(status & STATUS_BUSY))
>> - goto out;
>> - } while (time_before(jiffies, timeo));
>> + status = *spinand->scratchbuf;
>> + if (!(status & STATUS_BUSY))
>> + goto out;
>
> Looks like you expect the driver to not only wait for a status change
> but also fill the data buffer with the last status value. I think that
> should be documented in the SPI mem API.
Right, i will update the API.
Thanks
Patrice
>
>> /*
>> * Extra read, just in case the STATUS_READY bit has changed
>> @@ -526,7 +532,10 @@ static int spinand_reset_op(struct spinand_device *spinand)
>> if (ret)
>> return ret;
>>
>> - return spinand_wait(spinand, NULL);
>> + return spinand_wait(spinand,
>> + SPINAND_RESET_INITIAL_DELAY_US,
>> + SPINAND_RESET_POLL_DELAY_US,
>> + NULL);
>> }
>>
>> static int spinand_lock_block(struct spinand_device *spinand, u8 lock)
>> @@ -549,7 +558,10 @@ static int spinand_read_page(struct spinand_device *spinand,
>> if (ret)
>> return ret;
>>
>> - ret = spinand_wait(spinand, &status);
>> + ret = spinand_wait(spinand,
>> + SPINAND_READ_INITIAL_DELAY_US,
>> + SPINAND_READ_POLL_DELAY_US,
>> + &status);
>> if (ret < 0)
>> return ret;
>>
>> @@ -585,7 +597,10 @@ static int spinand_write_page(struct spinand_device *spinand,
>> if (ret)
>> return ret;
>>
>> - ret = spinand_wait(spinand, &status);
>> + ret = spinand_wait(spinand,
>> + SPINAND_WRITE_INITIAL_DELAY_US,
>> + SPINAND_WRITE_POLL_DELAY_US,
>> + &status);
>> if (!ret && (status & STATUS_PROG_FAILED))
>> return -EIO;
>>
>> @@ -768,7 +783,11 @@ static int spinand_erase(struct nand_device *nand, const struct nand_pos *pos)
>> if (ret)
>> return ret;
>>
>> - ret = spinand_wait(spinand, &status);
>> + ret = spinand_wait(spinand,
>> + SPINAND_ERASE_INITIAL_DELAY_US,
>> + SPINAND_ERASE_POLL_DELAY_US,
>> + &status);
>> +
>> if (!ret && (status & STATUS_ERASE_FAILED))
>> ret = -EIO;
>>
>> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
>> index 6bb92f26833e..6988956b8492 100644
>> --- a/include/linux/mtd/spinand.h
>> +++ b/include/linux/mtd/spinand.h
>> @@ -170,6 +170,28 @@ struct spinand_op;
>> struct spinand_device;
>>
>> #define SPINAND_MAX_ID_LEN 4
>> +/*
>> + * For erase, write and read operation, we got the following timings :
>> + * tBERS (erase) 1ms to 4ms
>> + * tPROG 300us to 400us
>> + * tREAD 25us to 100us
>> + * In order to minimize latency, the min value is divided by 4 for the
>> + * initial delay, and dividing by 20 for the poll delay.
>> + * For reset, 5us/10us/500us if the device is respectively
>> + * reading/programming/erasing when the RESET occurs. Since we always
>> + * issue a RESET when the device is IDLE, 5us is selected for both initial
>> + * and poll delay.
>> + */
>> +#define SPINAND_READ_INITIAL_DELAY_US 6
>> +#define SPINAND_READ_POLL_DELAY_US 5
>> +#define SPINAND_RESET_INITIAL_DELAY_US 5
>> +#define SPINAND_RESET_POLL_DELAY_US 5
>> +#define SPINAND_WRITE_INITIAL_DELAY_US 75
>> +#define SPINAND_WRITE_POLL_DELAY_US 15
>> +#define SPINAND_ERASE_INITIAL_DELAY_US 250
>> +#define SPINAND_ERASE_POLL_DELAY_US 50
>> +
>> +#define SPINAND_WAITRDY_TIMEOUT_MS 400
>>
>> /**
>> * struct spinand_id - SPI NAND id structure
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs
2021-05-18 13:43 ` [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs patrice.chotard
2021-05-18 14:18 ` Boris Brezillon
@ 2021-05-18 14:19 ` Boris Brezillon
1 sibling, 0 replies; 11+ messages in thread
From: Boris Brezillon @ 2021-05-18 14:19 UTC (permalink / raw)
To: patrice.chotard
Cc: Mark Brown, Miquel Raynal, Vignesh Raghavendra, linux-mtd,
Alexandre Torgue, linux-spi, linux-stm32, linux-arm-kernel,
linux-kernel, christophe.kerello
On Tue, 18 May 2021 15:43:31 +0200
<patrice.chotard@foss.st.com> wrote:
> From: Patrice Chotard <patrice.chotard@foss.st.com>
>
> Make use of spi-mem poll status APIs to let advanced controllers
> optimize wait operations.
> This should also fix the high CPU usage for system that don't have
> a dedicated STATUS poll block logic.
>
> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
> ---
> Changes in v4:
> - Update commit message.
> - Add comment which explains how delays has been calculated.
> - Rename SPINAND_STATUS_TIMEOUT_MS to SPINAND_WAITRDY_TIMEOUT_MS.
>
> Changes in v3:
> - Add initial_delay_us and polling_delay_us parameters to spinand_wait()
> - Add SPINAND_READ/WRITE/ERASE/RESET_INITIAL_DELAY_US and
> SPINAND_READ/WRITE/ERASE/RESET_POLL_DELAY_US defines.
>
> Changes in v2:
> - non-offload case is now managed by spi_mem_poll_status()
>
> drivers/mtd/nand/spi/core.c | 45 ++++++++++++++++++++++++++-----------
> include/linux/mtd/spinand.h | 22 ++++++++++++++++++
> 2 files changed, 54 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index 17f63f95f4a2..3131fae0c715 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -473,20 +473,26 @@ static int spinand_erase_op(struct spinand_device *spinand,
> return spi_mem_exec_op(spinand->spimem, &op);
> }
>
> -static int spinand_wait(struct spinand_device *spinand, u8 *s)
> +static int spinand_wait(struct spinand_device *spinand,
> + unsigned long initial_delay_us,
> + unsigned long poll_delay_us,
> + u8 *s)
> {
> - unsigned long timeo = jiffies + msecs_to_jiffies(400);
> + struct spi_mem_op op = SPINAND_GET_FEATURE_OP(REG_STATUS,
> + spinand->scratchbuf);
> u8 status;
> int ret;
>
> - do {
> - ret = spinand_read_status(spinand, &status);
> - if (ret)
> - return ret;
> + ret = spi_mem_poll_status(spinand->spimem, &op, STATUS_BUSY, 0,
> + initial_delay_us,
> + poll_delay_us,
> + SPINAND_WAITRDY_TIMEOUT_MS);
> + if (ret)
> + return ret;
>
> - if (!(status & STATUS_BUSY))
> - goto out;
> - } while (time_before(jiffies, timeo));
> + status = *spinand->scratchbuf;
> + if (!(status & STATUS_BUSY))
> + goto out;
>
> /*
> * Extra read, just in case the STATUS_READY bit has changed
> @@ -526,7 +532,10 @@ static int spinand_reset_op(struct spinand_device *spinand)
> if (ret)
> return ret;
>
> - return spinand_wait(spinand, NULL);
> + return spinand_wait(spinand,
> + SPINAND_RESET_INITIAL_DELAY_US,
> + SPINAND_RESET_POLL_DELAY_US,
> + NULL);
> }
>
> static int spinand_lock_block(struct spinand_device *spinand, u8 lock)
> @@ -549,7 +558,10 @@ static int spinand_read_page(struct spinand_device *spinand,
> if (ret)
> return ret;
>
> - ret = spinand_wait(spinand, &status);
> + ret = spinand_wait(spinand,
> + SPINAND_READ_INITIAL_DELAY_US,
> + SPINAND_READ_POLL_DELAY_US,
> + &status);
> if (ret < 0)
> return ret;
>
> @@ -585,7 +597,10 @@ static int spinand_write_page(struct spinand_device *spinand,
> if (ret)
> return ret;
>
> - ret = spinand_wait(spinand, &status);
> + ret = spinand_wait(spinand,
> + SPINAND_WRITE_INITIAL_DELAY_US,
> + SPINAND_WRITE_POLL_DELAY_US,
> + &status);
> if (!ret && (status & STATUS_PROG_FAILED))
> return -EIO;
>
> @@ -768,7 +783,11 @@ static int spinand_erase(struct nand_device *nand, const struct nand_pos *pos)
> if (ret)
> return ret;
>
> - ret = spinand_wait(spinand, &status);
> + ret = spinand_wait(spinand,
> + SPINAND_ERASE_INITIAL_DELAY_US,
> + SPINAND_ERASE_POLL_DELAY_US,
> + &status);
> +
> if (!ret && (status & STATUS_ERASE_FAILED))
> ret = -EIO;
>
> diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
> index 6bb92f26833e..6988956b8492 100644
> --- a/include/linux/mtd/spinand.h
> +++ b/include/linux/mtd/spinand.h
> @@ -170,6 +170,28 @@ struct spinand_op;
> struct spinand_device;
>
> #define SPINAND_MAX_ID_LEN 4
> +/*
> + * For erase, write and read operation, we got the following timings :
> + * tBERS (erase) 1ms to 4ms
> + * tPROG 300us to 400us
> + * tREAD 25us to 100us
> + * In order to minimize latency, the min value is divided by 4 for the
> + * initial delay, and dividing by 20 for the poll delay.
> + * For reset, 5us/10us/500us if the device is respectively
> + * reading/programming/erasing when the RESET occurs. Since we always
> + * issue a RESET when the device is IDLE, 5us is selected for both initial
> + * and poll delay.
> + */
> +#define SPINAND_READ_INITIAL_DELAY_US 6
> +#define SPINAND_READ_POLL_DELAY_US 5
> +#define SPINAND_RESET_INITIAL_DELAY_US 5
> +#define SPINAND_RESET_POLL_DELAY_US 5
> +#define SPINAND_WRITE_INITIAL_DELAY_US 75
> +#define SPINAND_WRITE_POLL_DELAY_US 15
> +#define SPINAND_ERASE_INITIAL_DELAY_US 250
> +#define SPINAND_ERASE_POLL_DELAY_US 50
> +
> +#define SPINAND_WAITRDY_TIMEOUT_MS 400
>
> /**
> * struct spinand_id - SPI NAND id structure
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v4 3/3] spi: stm32-qspi: add automatic poll status feature
2021-05-18 13:43 [PATCH v4 0/3] MTD: spinand: Add spi_mem_poll_status() support patrice.chotard
2021-05-18 13:43 ` [PATCH v4 1/3] spi: spi-mem: add automatic poll status functions patrice.chotard
2021-05-18 13:43 ` [PATCH v4 2/3] mtd: spinand: use the spi-mem poll status APIs patrice.chotard
@ 2021-05-18 13:43 ` patrice.chotard
2021-05-18 14:37 ` Boris Brezillon
2 siblings, 1 reply; 11+ messages in thread
From: patrice.chotard @ 2021-05-18 13:43 UTC (permalink / raw)
To: Mark Brown, Miquel Raynal, Vignesh Raghavendra, Boris Brezillon,
linux-mtd, Alexandre Torgue, linux-spi, linux-stm32,
linux-arm-kernel, linux-kernel
Cc: patrice.chotard, christophe.kerello
From: Patrice Chotard <patrice.chotard@foss.st.com>
STM32 QSPI is able to automatically poll a specified register inside the
memory and relieve the CPU from this task.
As example, when erasing a large memory area, we got cpu load
equal to 50%. This patch allows to perform the same operation
with a cpu load around 2%.
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
---
Changes in v4:
- None
Changes in v3:
- Remove spi_mem_finalize_op() API added in v2.
Changes in v2:
- mask and match stm32_qspi_poll_status() parameters are 2-byte wide
- Make usage of new spi_mem_finalize_op() API in stm32_qspi_wait_poll_status()
drivers/spi/spi-stm32-qspi.c | 83 ++++++++++++++++++++++++++++++++----
1 file changed, 75 insertions(+), 8 deletions(-)
diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
index 7e640ccc7e77..01168a859005 100644
--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -36,6 +36,7 @@
#define CR_FTIE BIT(18)
#define CR_SMIE BIT(19)
#define CR_TOIE BIT(20)
+#define CR_APMS BIT(22)
#define CR_PRESC_MASK GENMASK(31, 24)
#define QSPI_DCR 0x04
@@ -53,6 +54,7 @@
#define QSPI_FCR 0x0c
#define FCR_CTEF BIT(0)
#define FCR_CTCF BIT(1)
+#define FCR_CSMF BIT(3)
#define QSPI_DLR 0x10
@@ -107,6 +109,7 @@ struct stm32_qspi {
u32 clk_rate;
struct stm32_qspi_flash flash[STM32_QSPI_MAX_NORCHIP];
struct completion data_completion;
+ struct completion match_completion;
u32 fmode;
struct dma_chan *dma_chtx;
@@ -115,6 +118,7 @@ struct stm32_qspi {
u32 cr_reg;
u32 dcr_reg;
+ unsigned long status_timeout;
/*
* to protect device configuration, could be different between
@@ -128,11 +132,20 @@ static irqreturn_t stm32_qspi_irq(int irq, void *dev_id)
struct stm32_qspi *qspi = (struct stm32_qspi *)dev_id;
u32 cr, sr;
+ cr = readl_relaxed(qspi->io_base + QSPI_CR);
sr = readl_relaxed(qspi->io_base + QSPI_SR);
+ if (cr & CR_SMIE && sr & SR_SMF) {
+ /* disable irq */
+ cr &= ~CR_SMIE;
+ writel_relaxed(cr, qspi->io_base + QSPI_CR);
+ complete(&qspi->match_completion);
+
+ return IRQ_HANDLED;
+ }
+
if (sr & (SR_TEF | SR_TCF)) {
/* disable irq */
- cr = readl_relaxed(qspi->io_base + QSPI_CR);
cr &= ~CR_TCIE & ~CR_TEIE;
writel_relaxed(cr, qspi->io_base + QSPI_CR);
complete(&qspi->data_completion);
@@ -319,6 +332,24 @@ static int stm32_qspi_wait_cmd(struct stm32_qspi *qspi,
return err;
}
+static int stm32_qspi_wait_poll_status(struct stm32_qspi *qspi,
+ const struct spi_mem_op *op)
+{
+ u32 cr;
+
+ reinit_completion(&qspi->match_completion);
+ cr = readl_relaxed(qspi->io_base + QSPI_CR);
+ writel_relaxed(cr | CR_SMIE, qspi->io_base + QSPI_CR);
+
+ if (!wait_for_completion_timeout(&qspi->match_completion,
+ msecs_to_jiffies(qspi->status_timeout)))
+ return -ETIMEDOUT;
+
+ writel_relaxed(FCR_CSMF, qspi->io_base + QSPI_FCR);
+
+ return 0;
+}
+
static int stm32_qspi_get_mode(struct stm32_qspi *qspi, u8 buswidth)
{
if (buswidth == 4)
@@ -332,7 +363,7 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
struct stm32_qspi_flash *flash = &qspi->flash[mem->spi->chip_select];
u32 ccr, cr;
- int timeout, err = 0;
+ int timeout, err = 0, err_poll_status = 0;
dev_dbg(qspi->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
@@ -378,6 +409,9 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
if (op->addr.nbytes && qspi->fmode != CCR_FMODE_MM)
writel_relaxed(op->addr.val, qspi->io_base + QSPI_AR);
+ if (qspi->fmode == CCR_FMODE_APM)
+ err_poll_status = stm32_qspi_wait_poll_status(qspi, op);
+
err = stm32_qspi_tx(qspi, op);
/*
@@ -387,7 +421,7 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
* byte of device (device size - fifo size). like device size is not
* knows, the prefetching is always stop.
*/
- if (err || qspi->fmode == CCR_FMODE_MM)
+ if (err || err_poll_status || qspi->fmode == CCR_FMODE_MM)
goto abort;
/* wait end of tx in indirect mode */
@@ -406,15 +440,46 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
cr, !(cr & CR_ABORT), 1,
STM32_ABT_TIMEOUT_US);
- writel_relaxed(FCR_CTCF, qspi->io_base + QSPI_FCR);
+ writel_relaxed(FCR_CTCF | FCR_CSMF, qspi->io_base + QSPI_FCR);
- if (err || timeout)
- dev_err(qspi->dev, "%s err:%d abort timeout:%d\n",
- __func__, err, timeout);
+ if (err || err_poll_status || timeout)
+ dev_err(qspi->dev, "%s err:%d err_poll_status:%d abort timeout:%d\n",
+ __func__, err, err_poll_status, timeout);
return err;
}
+static int stm32_qspi_poll_status(struct spi_mem *mem, const struct spi_mem_op *op,
+ u16 mask, u16 match,
+ unsigned long initial_delay_us,
+ unsigned long polling_rate_us,
+ unsigned long timeout_ms)
+{
+ struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
+ int ret;
+
+ ret = pm_runtime_get_sync(qspi->dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(qspi->dev);
+ return ret;
+ }
+
+ mutex_lock(&qspi->lock);
+
+ writel_relaxed(mask, qspi->io_base + QSPI_PSMKR);
+ writel_relaxed(match, qspi->io_base + QSPI_PSMAR);
+ qspi->fmode = CCR_FMODE_APM;
+ qspi->status_timeout = timeout_ms;
+
+ ret = stm32_qspi_send(mem, op);
+ mutex_unlock(&qspi->lock);
+
+ pm_runtime_mark_last_busy(qspi->dev);
+ pm_runtime_put_autosuspend(qspi->dev);
+
+ return ret;
+}
+
static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
@@ -527,7 +592,7 @@ static int stm32_qspi_setup(struct spi_device *spi)
flash->presc = presc;
mutex_lock(&qspi->lock);
- qspi->cr_reg = 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN;
+ qspi->cr_reg = CR_APMS | 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN;
writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
/* set dcr fsize to max address */
@@ -607,6 +672,7 @@ static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
.exec_op = stm32_qspi_exec_op,
.dirmap_create = stm32_qspi_dirmap_create,
.dirmap_read = stm32_qspi_dirmap_read,
+ .poll_status = stm32_qspi_poll_status,
};
static int stm32_qspi_probe(struct platform_device *pdev)
@@ -661,6 +727,7 @@ static int stm32_qspi_probe(struct platform_device *pdev)
}
init_completion(&qspi->data_completion);
+ init_completion(&qspi->match_completion);
qspi->clk = devm_clk_get(dev, NULL);
if (IS_ERR(qspi->clk)) {
--
2.17.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH v4 3/3] spi: stm32-qspi: add automatic poll status feature
2021-05-18 13:43 ` [PATCH v4 3/3] spi: stm32-qspi: add automatic poll status feature patrice.chotard
@ 2021-05-18 14:37 ` Boris Brezillon
2021-05-18 15:48 ` Patrice CHOTARD
0 siblings, 1 reply; 11+ messages in thread
From: Boris Brezillon @ 2021-05-18 14:37 UTC (permalink / raw)
To: patrice.chotard
Cc: Mark Brown, Miquel Raynal, Vignesh Raghavendra, linux-mtd,
Alexandre Torgue, linux-spi, linux-stm32, linux-arm-kernel,
linux-kernel, christophe.kerello
On Tue, 18 May 2021 15:43:32 +0200
<patrice.chotard@foss.st.com> wrote:
> +static int stm32_qspi_poll_status(struct spi_mem *mem, const struct spi_mem_op *op,
> + u16 mask, u16 match,
> + unsigned long initial_delay_us,
> + unsigned long polling_rate_us,
> + unsigned long timeout_ms)
> +{
> + struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
> + int ret;
> +
The spi_mem_supports_op() call is still missing.
> + ret = pm_runtime_get_sync(qspi->dev);
> + if (ret < 0) {
> + pm_runtime_put_noidle(qspi->dev);
> + return ret;
> + }
> +
> + mutex_lock(&qspi->lock);
> +
> + writel_relaxed(mask, qspi->io_base + QSPI_PSMKR);
> + writel_relaxed(match, qspi->io_base + QSPI_PSMAR);
> + qspi->fmode = CCR_FMODE_APM;
> + qspi->status_timeout = timeout_ms;
> +
> + ret = stm32_qspi_send(mem, op);
> + mutex_unlock(&qspi->lock);
> +
> + pm_runtime_mark_last_busy(qspi->dev);
> + pm_runtime_put_autosuspend(qspi->dev);
> +
> + return ret;
> +}
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v4 3/3] spi: stm32-qspi: add automatic poll status feature
2021-05-18 14:37 ` Boris Brezillon
@ 2021-05-18 15:48 ` Patrice CHOTARD
0 siblings, 0 replies; 11+ messages in thread
From: Patrice CHOTARD @ 2021-05-18 15:48 UTC (permalink / raw)
To: Boris Brezillon
Cc: Mark Brown, Miquel Raynal, Vignesh Raghavendra, linux-mtd,
Alexandre Torgue, linux-spi, linux-stm32, linux-arm-kernel,
linux-kernel, christophe.kerello
On 5/18/21 4:37 PM, Boris Brezillon wrote:
> On Tue, 18 May 2021 15:43:32 +0200
> <patrice.chotard@foss.st.com> wrote:
>
>> +static int stm32_qspi_poll_status(struct spi_mem *mem, const struct spi_mem_op *op,
>> + u16 mask, u16 match,
>> + unsigned long initial_delay_us,
>> + unsigned long polling_rate_us,
>> + unsigned long timeout_ms)
>> +{
>> + struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
>> + int ret;
>> +
>
> The spi_mem_supports_op() call is still missing.
Yes, i forgot it
Thanks
Patrice
>
>> + ret = pm_runtime_get_sync(qspi->dev);
>> + if (ret < 0) {
>> + pm_runtime_put_noidle(qspi->dev);
>> + return ret;
>> + }
>> +
>> + mutex_lock(&qspi->lock);
>> +
>> + writel_relaxed(mask, qspi->io_base + QSPI_PSMKR);
>> + writel_relaxed(match, qspi->io_base + QSPI_PSMAR);
>> + qspi->fmode = CCR_FMODE_APM;
>> + qspi->status_timeout = timeout_ms;
>> +
>> + ret = stm32_qspi_send(mem, op);
>> + mutex_unlock(&qspi->lock);
>> +
>> + pm_runtime_mark_last_busy(qspi->dev);
>> + pm_runtime_put_autosuspend(qspi->dev);
>> +
>> + return ret;
>> +}
^ permalink raw reply [flat|nested] 11+ messages in thread