[PATCH 6/9] serial: sc16is7xx: add support for rs485 RTS delays in microseconds

[PATCH 6/9] serial: sc16is7xx: add support for rs485 RTS delays in microseconds

[Martin Kepplinger]

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Read struct serial_rs485's flag SER_RS485_DELAY_IN_USEC and apply the delay
accordingly.

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
---
 drivers/tty/serial/sc16is7xx.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 635178cf3eed..b0e00b9fb177 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -743,7 +743,13 @@ static void sc16is7xx_tx_proc(struct kthread_work *ws)
 	struct uart_port *port = &(to_sc16is7xx_one(ws, tx_work)->port);
 
 	if ((port->rs485.flags & SER_RS485_ENABLED) &&
-	    (port->rs485.delay_rts_before_send > 0))
+	    (port->rs485.delay_rts_before_send > 0) &&
+	    (port->rs485.flags & SER_RS485_DELAY_IN_USEC))
+		usleep_range(port->rs485.delay_rts_before_send,
+			     port->rs485.delay_rts_before_send);
+	else if ((port->rs485.flags & SER_RS485_ENABLED) &&
+		 (port->rs485.delay_rts_before_send > 0) &&
+		 !(port->rs485.flags & SER_RS485_DELAY_IN_USEC))
 		msleep(port->rs485.delay_rts_before_send);
 
 	sc16is7xx_handle_tx(port);
-- 
2.20.1


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[PATCH 7/9] serial: atmel_serial: set SER_RS485_DELAY_IN_USEC accordingly

[Martin Kepplinger]

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Unset the SER_RS485_DELAY_IN_USEC flag during rs485 config for
userspace to get the correct setting.

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
---
 drivers/tty/serial/atmel_serial.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 05147fe24343..36ab1c131d36 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -346,6 +346,9 @@ static int atmel_config_rs485(struct uart_port *port,
 
 	port->rs485 = *rs485conf;
 
+	/* delays are in milliseconds */
+	rs485conf->flags &= ~SER_RS485_DELAY_IN_USEC;
+
 	if (rs485conf->flags & SER_RS485_ENABLED) {
 		dev_dbg(port->dev, "Setting UART to RS485\n");
 		atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
-- 
2.20.1


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[PATCH 8/9] serial: fsl_lpuart: set SER_RS485_DELAY_IN_USEC accordingly

[Martin Kepplinger]

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Clear SER_RS485_DELAY_IN_USEC for userspace to get correct settings.

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
---
 drivers/tty/serial/fsl_lpuart.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index ea1c85e3b432..a63aa22e3a25 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1124,6 +1124,7 @@ static int lpuart_config_rs485(struct uart_port *port,
 	rs485->delay_rts_before_send = 0;
 	rs485->delay_rts_after_send = 0;
 	rs485->flags &= ~SER_RS485_RX_DURING_TX;
+	rs485->flags &= ~SER_RS485_DELAY_IN_USEC;
 
 	if (rs485->flags & SER_RS485_ENABLED) {
 		/* Enable auto RS-485 RTS mode */
-- 
2.20.1


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[PATCH 9/9] serial: st32-usart: set SER_RS485_DELAY_IN_USEC accordingly

[Martin Kepplinger]

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Unset SER_RS485_DELAY_IN_USEC for userspace to get correct settings.

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
---
 drivers/tty/serial/stm32-usart.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index e8d7a7bb4339..4daf5fc71644 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -112,6 +112,7 @@ static int stm32_config_rs485(struct uart_port *port,
 
 	port->rs485 = *rs485conf;
 
+	rs485conf->flags &= ~SER_RS485_DELAY_IN_USEC;
 	rs485conf->flags |= SER_RS485_RX_DURING_TX;
 
 	if (rs485conf->flags & SER_RS485_ENABLED) {
-- 
2.20.1


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