* Move RS485 implementation from drivers to serial core (v4)
@ 2022-02-28 2:39 Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 1/9] serial: core: move RS485 configuration tasks from drivers into core Lino Sanfilippo
` (8 more replies)
0 siblings, 9 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger
This patch series is an attempt to simplify rs485 implementation in drivers
by moving the following tasks out of the drivers into the serial core:
- ensure sane RTS settings: in case of an invalid configuration (both RTS
after send and RTS on send set or both unset) enable RTS on send and
disable RTS after send
- nullify the padding field of the serial_rs485 struct before it is
returned to userspace
- copy the configuration stored in the serial_rs485 struct to the port
configuration if setting the configuration in the driver was successfull
- limit the RTS delay to 100ms
Redundant code has been removed from the following drivers for now:
- atmel
- fsl_lpuart
- amba
- imx
- max310x
- omap-serial
- sc16is7xx
- stm32-usart
The code has been tested with the amba pl011 driver. This series applies
against Gregs tty-testing branch.
Changes in v2:
- use a makro for max RTS delays and comment it (as requested by Jiri)
- add a comment concerning the memset of a structures padding field - correct
typos in the commit message (found by Uwe)
- rephrase all commit messages to make more clear that function
uart_set_rs485_config() has been extended by checks and other functionalities
(as requested by Uwe)
Changes in v3:
- add warning messages if the serial core corrects RS485 values (as requested by
Lukas Wunner)
- dont expose the macro for max RTS delays to userspace (as requested by Greg)
Changes in v4:
- use ratelimit warning messages and also print device, uart port name and line
(as requested by Jiri)
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v4 1/9] serial: core: move RS485 configuration tasks from drivers into core
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-03-20 0:01 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 2/9] serial: amba-pl011: remove redundant code in rs485_config Lino Sanfilippo
` (7 subsequent siblings)
8 siblings, 1 reply; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
Several drivers that support setting the RS485 configuration via userspace
implement one or more of the following tasks:
- in case of an invalid RTS configuration (both RTS after send and RTS on
send set or both unset) fall back to enable RTS on send and disable RTS
after send
- nullify the padding field of the returned serial_rs485 struct
- copy the configuration into the uart port struct
- limit RTS delays to 100 ms
Move these tasks into the serial core to make them generic and to provide
a consistent behaviour among all drivers.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/serial_core.c | 33 ++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 846192a7b4bf..06eb3cfbe610 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -42,6 +42,11 @@ static struct lock_class_key port_lock_key;
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
+/*
+ * Max time with active RTS before/after data is sent.
+ */
+#define RS485_MAX_RTS_DELAY 100 /* msecs */
+
static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
struct ktermios *old_termios);
static void uart_wait_until_sent(struct tty_struct *tty, int timeout);
@@ -1282,8 +1287,36 @@ static int uart_set_rs485_config(struct uart_port *port,
if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user)))
return -EFAULT;
+ /* pick sane settings if the user hasn't */
+ if (!(rs485.flags & SER_RS485_RTS_ON_SEND) ==
+ !(rs485.flags & SER_RS485_RTS_AFTER_SEND)) {
+ dev_warn_ratelimited(port->dev,
+ "%s (%d): invalid RTS setting, using RTS_ON_SEND instead\n",
+ port->name, port->line);
+ rs485.flags |= SER_RS485_RTS_ON_SEND;
+ rs485.flags &= ~SER_RS485_RTS_AFTER_SEND;
+ }
+
+ if (rs485.delay_rts_before_send > RS485_MAX_RTS_DELAY) {
+ rs485.delay_rts_before_send = RS485_MAX_RTS_DELAY;
+ dev_warn_ratelimited(port->dev,
+ "%s (%d): RTS delay before sending clamped to %u ms\n",
+ port->name, port->line, rs485.delay_rts_before_send);
+ }
+
+ if (rs485.delay_rts_after_send > RS485_MAX_RTS_DELAY) {
+ rs485.delay_rts_after_send = RS485_MAX_RTS_DELAY;
+ dev_warn_ratelimited(port->dev,
+ "%s (%d): RTS delay after sending clamped to %u ms\n",
+ port->name, port->line, rs485.delay_rts_after_send);
+ }
+ /* Return clean padding area to userspace */
+ memset(rs485.padding, 0, sizeof(rs485.padding));
+
spin_lock_irqsave(&port->lock, flags);
ret = port->rs485_config(port, &rs485);
+ if (!ret)
+ port->rs485 = rs485;
spin_unlock_irqrestore(&port->lock, flags);
if (ret)
return ret;
base-commit: 71404f653cf7858fdbb81dd5419a8a4ac4ffa20c
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 2/9] serial: amba-pl011: remove redundant code in rs485_config
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 1/9] serial: core: move RS485 configuration tasks from drivers into core Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 3/9] serial: stm32: " Lino Sanfilippo
` (6 subsequent siblings)
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already
- ensures that only one of both options RTS on send or RTS after send is
set
- nullifies the padding field of the passed serial_rs485 struct
- clamps the RTS delays
- assigns the passed serial_rs485 struct to the uart port
So remove these tasks from the code of the drivers rs485_config() function
to avoid redundancy.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/amba-pl011.c | 16 +---------------
1 file changed, 1 insertion(+), 15 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index ba053a68529f..35c633739975 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2170,25 +2170,11 @@ static int pl011_rs485_config(struct uart_port *port,
struct uart_amba_port *uap =
container_of(port, struct uart_amba_port, port);
- /* pick sane settings if the user hasn't */
- if (!(rs485->flags & SER_RS485_RTS_ON_SEND) ==
- !(rs485->flags & SER_RS485_RTS_AFTER_SEND)) {
- rs485->flags |= SER_RS485_RTS_ON_SEND;
- rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
- }
- /* clamp the delays to [0, 100ms] */
- rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
- rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
- memset(rs485->padding, 0, sizeof(rs485->padding));
-
if (port->rs485.flags & SER_RS485_ENABLED)
pl011_rs485_tx_stop(uap);
- /* Set new configuration */
- port->rs485 = *rs485;
-
/* Make sure auto RTS is disabled */
- if (port->rs485.flags & SER_RS485_ENABLED) {
+ if (rs485->flags & SER_RS485_ENABLED) {
u32 cr = pl011_read(uap, REG_CR);
cr &= ~UART011_CR_RTSEN;
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 3/9] serial: stm32: remove redundant code in rs485_config
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 1/9] serial: core: move RS485 configuration tasks from drivers into core Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 2/9] serial: amba-pl011: remove redundant code in rs485_config Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 4/9] serial: sc16is7xx: remove redundant check " Lino Sanfilippo
` (5 subsequent siblings)
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already ensures that only one of
both options RTS on send or RTS after send is set. It also assigns the
passed serial_rs485 struct to the uart port.
So remove the check and the assignment from the drivers rs485_config()
function to avoid redundancy.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/stm32-usart.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 1b3a611ac39e..6a014168102c 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -107,8 +107,6 @@ static int stm32_usart_config_rs485(struct uart_port *port,
stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
- port->rs485 = *rs485conf;
-
rs485conf->flags |= SER_RS485_RX_DURING_TX;
if (rs485conf->flags & SER_RS485_ENABLED) {
@@ -128,13 +126,10 @@ static int stm32_usart_config_rs485(struct uart_port *port,
rs485conf->delay_rts_after_send,
baud);
- if (rs485conf->flags & SER_RS485_RTS_ON_SEND) {
+ if (rs485conf->flags & SER_RS485_RTS_ON_SEND)
cr3 &= ~USART_CR3_DEP;
- rs485conf->flags &= ~SER_RS485_RTS_AFTER_SEND;
- } else {
+ else
cr3 |= USART_CR3_DEP;
- rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
- }
writel_relaxed(cr3, port->membase + ofs->cr3);
writel_relaxed(cr1, port->membase + ofs->cr1);
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 4/9] serial: sc16is7xx: remove redundant check in rs485_config
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
` (2 preceding siblings ...)
2022-02-28 2:39 ` [PATCH v4 3/9] serial: stm32: " Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 5/9] serial: omap: remove redundant code " Lino Sanfilippo
` (4 subsequent siblings)
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already ensures that only one of
both options RTS on send or RTS after send is set.
So remove this check from the drivers rs485_config() function to avoid
redundancy.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/sc16is7xx.c | 10 ----------
1 file changed, 10 deletions(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index b7a2db9c03e2..b4e66a322a58 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -983,16 +983,6 @@ static int sc16is7xx_config_rs485(struct uart_port *port,
struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
if (rs485->flags & SER_RS485_ENABLED) {
- bool rts_during_rx, rts_during_tx;
-
- rts_during_rx = rs485->flags & SER_RS485_RTS_AFTER_SEND;
- rts_during_tx = rs485->flags & SER_RS485_RTS_ON_SEND;
-
- if (rts_during_rx == rts_during_tx)
- dev_err(port->dev,
- "unsupported RTS signalling on_send:%d after_send:%d - exactly one of RS485 RTS flags should be set\n",
- rts_during_tx, rts_during_rx);
-
/*
* RTS signal is handled by HW, it's timing can't be influenced.
* However, it's sometimes useful to delay TX even without RTS
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 5/9] serial: omap: remove redundant code in rs485_config
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
` (3 preceding siblings ...)
2022-02-28 2:39 ` [PATCH v4 4/9] serial: sc16is7xx: remove redundant check " Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 6/9] serial: max310: remove redundant memset " Lino Sanfilippo
` (3 subsequent siblings)
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already clamps the RTS delays.
It also assigns the passed serial_rs485 struct to the uart port.
So remove these tasks from the drivers rs485_config() function to avoid
redundancy.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/omap-serial.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index b4e060205e61..15ddaa1fdfa4 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1336,18 +1336,11 @@ serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
up->ier = 0;
serial_out(up, UART_IER, 0);
- /* Clamp the delays to [0, 100ms] */
- rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
- rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
-
- /* store new config */
- port->rs485 = *rs485;
-
if (up->rts_gpiod) {
/* enable / disable rts */
- val = (port->rs485.flags & SER_RS485_ENABLED) ?
+ val = (rs485->flags & SER_RS485_ENABLED) ?
SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
- val = (port->rs485.flags & val) ? 1 : 0;
+ val = (rs485->flags & val) ? 1 : 0;
gpiod_set_value(up->rts_gpiod, val);
}
@@ -1358,7 +1351,7 @@ serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
/* If RS-485 is disabled, make sure the THR interrupt is fired when
* TX FIFO is below the trigger level.
*/
- if (!(port->rs485.flags & SER_RS485_ENABLED) &&
+ if (!(rs485->flags & SER_RS485_ENABLED) &&
(up->scr & OMAP_UART_SCR_TX_EMPTY)) {
up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
serial_out(up, UART_OMAP_SCR, up->scr);
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 6/9] serial: max310: remove redundant memset in rs485_config
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
` (4 preceding siblings ...)
2022-02-28 2:39 ` [PATCH v4 5/9] serial: omap: remove redundant code " Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 7/9] serial: imx: remove redundant assignment " Lino Sanfilippo
` (2 subsequent siblings)
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already nullifies the padding
field of the passed serial_rs485 struct before returning it to userspace.
Doing the same in the drivers rs485_config() function is redundant, so
remove the concerning memset in this function.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/max310x.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index dde0824b2fa5..2ecc5f66deaf 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1037,7 +1037,6 @@ static int max310x_rs485_config(struct uart_port *port,
rs485->flags &= SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX |
SER_RS485_ENABLED;
- memset(rs485->padding, 0, sizeof(rs485->padding));
port->rs485 = *rs485;
schedule_work(&one->rs_work);
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 7/9] serial: imx: remove redundant assignment in rs485_config
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
` (5 preceding siblings ...)
2022-02-28 2:39 ` [PATCH v4 6/9] serial: max310: remove redundant memset " Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 8/9] serial: fsl_lpuart: remove redundant code in rs485_config functions Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 9/9] serial: atmel: remove redundant assignment in rs485_config Lino Sanfilippo
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already assigns the passed
serial_rs485 struct to the uart port.
So remove the assignment in the drivers rs485_config() function to avoid
reduncancy.
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/imx.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 0b467ce8d737..ab56ff23e8a9 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1937,8 +1937,6 @@ static int imx_uart_rs485_config(struct uart_port *port,
rs485conf->flags & SER_RS485_RX_DURING_TX)
imx_uart_start_rx(port);
- port->rs485 = *rs485conf;
-
return 0;
}
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 8/9] serial: fsl_lpuart: remove redundant code in rs485_config functions
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
` (6 preceding siblings ...)
2022-02-28 2:39 ` [PATCH v4 7/9] serial: imx: remove redundant assignment " Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 9/9] serial: atmel: remove redundant assignment in rs485_config Lino Sanfilippo
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already ensures that only one of
both options RTS on send or RTS after send is set. It also assigns the
passed serial_rs485 struct to the uart port.
So remove the check and the assignment from the drivers rs485_config()
function to avoid redundancy.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/fsl_lpuart.c | 32 --------------------------------
1 file changed, 32 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 7d90c5a530ee..a201be44d68a 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1377,19 +1377,6 @@ static int lpuart_config_rs485(struct uart_port *port,
/* Enable auto RS-485 RTS mode */
modem |= UARTMODEM_TXRTSE;
- /*
- * RTS needs to be logic HIGH either during transfer _or_ after
- * transfer, other variants are not supported by the hardware.
- */
-
- if (!(rs485->flags & (SER_RS485_RTS_ON_SEND |
- SER_RS485_RTS_AFTER_SEND)))
- rs485->flags |= SER_RS485_RTS_ON_SEND;
-
- if (rs485->flags & SER_RS485_RTS_ON_SEND &&
- rs485->flags & SER_RS485_RTS_AFTER_SEND)
- rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
-
/*
* The hardware defaults to RTS logic HIGH while transfer.
* Switch polarity in case RTS shall be logic HIGH
@@ -1402,9 +1389,6 @@ static int lpuart_config_rs485(struct uart_port *port,
modem |= UARTMODEM_TXRTSPOL;
}
- /* Store the new configuration */
- sport->port.rs485 = *rs485;
-
writeb(modem, sport->port.membase + UARTMODEM);
return 0;
}
@@ -1428,19 +1412,6 @@ static int lpuart32_config_rs485(struct uart_port *port,
/* Enable auto RS-485 RTS mode */
modem |= UARTMODEM_TXRTSE;
- /*
- * RTS needs to be logic HIGH either during transfer _or_ after
- * transfer, other variants are not supported by the hardware.
- */
-
- if (!(rs485->flags & (SER_RS485_RTS_ON_SEND |
- SER_RS485_RTS_AFTER_SEND)))
- rs485->flags |= SER_RS485_RTS_ON_SEND;
-
- if (rs485->flags & SER_RS485_RTS_ON_SEND &&
- rs485->flags & SER_RS485_RTS_AFTER_SEND)
- rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
-
/*
* The hardware defaults to RTS logic HIGH while transfer.
* Switch polarity in case RTS shall be logic HIGH
@@ -1453,9 +1424,6 @@ static int lpuart32_config_rs485(struct uart_port *port,
modem |= UARTMODEM_TXRTSPOL;
}
- /* Store the new configuration */
- sport->port.rs485 = *rs485;
-
lpuart32_write(&sport->port, modem, UARTMODIR);
return 0;
}
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v4 9/9] serial: atmel: remove redundant assignment in rs485_config
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
` (7 preceding siblings ...)
2022-02-28 2:39 ` [PATCH v4 8/9] serial: fsl_lpuart: remove redundant code in rs485_config functions Lino Sanfilippo
@ 2022-02-28 2:39 ` Lino Sanfilippo
8 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-02-28 2:39 UTC (permalink / raw)
To: gregkh, jirislaby, u.kleine-koenig
Cc: linux, richard.genoud, nicolas.ferre, alexandre.belloni,
ludovic.desroches, shawnguo, s.hauer, kernel, festevam,
linux-imx, mcoquelin.stm32, alexandre.torgue, linux-serial,
linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger, Lino Sanfilippo
In uart_set_rs485_config() the serial core already assigns the passed
serial_rs485 struct to the uart port.
So remove the assignment from the drivers rs485_config() function to avoid
redundancy.
Acked-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
---
drivers/tty/serial/atmel_serial.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 73d43919898d..18d3bbdcb7a2 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -299,11 +299,9 @@ static int atmel_config_rs485(struct uart_port *port,
/* Resetting serial mode to RS232 (0x0) */
mode &= ~ATMEL_US_USMODE;
- port->rs485 = *rs485conf;
-
if (rs485conf->flags & SER_RS485_ENABLED) {
dev_dbg(port->dev, "Setting UART to RS485\n");
- if (port->rs485.flags & SER_RS485_RX_DURING_TX)
+ if (rs485conf->flags & SER_RS485_RX_DURING_TX)
atmel_port->tx_done_mask = ATMEL_US_TXRDY;
else
atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
--
2.35.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH v4 1/9] serial: core: move RS485 configuration tasks from drivers into core
2022-02-28 2:39 ` [PATCH v4 1/9] serial: core: move RS485 configuration tasks from drivers into core Lino Sanfilippo
@ 2022-03-20 0:01 ` Lino Sanfilippo
0 siblings, 0 replies; 11+ messages in thread
From: Lino Sanfilippo @ 2022-03-20 0:01 UTC (permalink / raw)
To: gregkh, jirislaby
Cc: u.kleine-koenig, linux, richard.genoud, nicolas.ferre,
alexandre.belloni, ludovic.desroches, shawnguo, s.hauer, kernel,
festevam, linux-imx, mcoquelin.stm32, alexandre.torgue,
linux-serial, linux-kernel, linux-arm-kernel, linux-stm32, lukas,
p.rosenberger
Hi Greg, Jiri,
On 28.02.22 at 03:39, Lino Sanfilippo wrote:
> Several drivers that support setting the RS485 configuration via userspace
> implement one or more of the following tasks:
>
> - in case of an invalid RTS configuration (both RTS after send and RTS on
> send set or both unset) fall back to enable RTS on send and disable RTS
> after send
>
> - nullify the padding field of the returned serial_rs485 struct
>
> - copy the configuration into the uart port struct
>
> - limit RTS delays to 100 ms
>
> Move these tasks into the serial core to make them generic and to provide
> a consistent behaviour among all drivers.
>
is this patch series mergeable now? Or is there anything else to do from my side?
Regards,
Lino
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2022-03-20 0:01 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-02-28 2:39 Move RS485 implementation from drivers to serial core (v4) Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 1/9] serial: core: move RS485 configuration tasks from drivers into core Lino Sanfilippo
2022-03-20 0:01 ` Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 2/9] serial: amba-pl011: remove redundant code in rs485_config Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 3/9] serial: stm32: " Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 4/9] serial: sc16is7xx: remove redundant check " Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 5/9] serial: omap: remove redundant code " Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 6/9] serial: max310: remove redundant memset " Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 7/9] serial: imx: remove redundant assignment " Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 8/9] serial: fsl_lpuart: remove redundant code in rs485_config functions Lino Sanfilippo
2022-02-28 2:39 ` [PATCH v4 9/9] serial: atmel: remove redundant assignment in rs485_config Lino Sanfilippo
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