[PATCH 3/9] serial: stm32: remove redundant code in rs485_config

Lino Sanfilippo LinoSanfilippo at gmx.de
Sun Feb 13 14:27:31 PST 2022


When RS485 is configured by userspace the serial core already ensures valid
RTS settings and assigns the configuration to the uart port. So remove
these tasks from the code of the drivers config_rs485 function to avoid
redundancy.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo at 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);
-- 
2.34.1



More information about the linux-arm-kernel mailing list