linux-kernel - [PATCH 5/9] serial: omap: remove redundant code in rs485

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Date:   Sun, 13 Feb 2022 23:27:33 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org
Cc:     linux@...linux.org.uk, richard.genoud@...il.com,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
        ludovic.desroches@...rochip.com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com, lukas@...ner.de,
        Lino Sanfilippo <LinoSanfilippo@....de>
Subject: [PATCH 5/9] serial: omap: remove redundant code in rs485_config

When RS485 is configured by userspace the serial core already clamps the
RTS delays and assigns the configuration 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@....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 0862941862c8..a3afcccfbd96 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1350,18 +1350,11 @@ 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);
 	}
 
@@ -1372,7 +1365,7 @@ 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);
-- 
2.34.1