linux-kernel - [PATCH v2 6/9] serial: 8250_dwlib: remove redundant sanity check for RS485 flags

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Date:   Sun,  3 Jul 2022 19:00:36 +0200
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org
Cc:     ilpo.jarvinen@...ux.intel.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        andriy.shevchenko@...ux.intel.com, vz@...ia.com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        lukas@...ner.de, p.rosenberger@...bus.com,
        Lino Sanfilippo <l.sanfilippo@...bus.com>
Subject: [PATCH v2 6/9] serial: 8250_dwlib: remove redundant sanity check for RS485 flags

From: Lino Sanfilippo <l.sanfilippo@...bus.com>

Before the drivers rs485_config() function is called the serial core
already ensures that only one of both options RTS on send or RTS after send
is set. So remove the concerning sanity check in the driver function to
avoid redundancy.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/tty/serial/8250/8250_dwlib.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dwlib.c b/drivers/tty/serial/8250/8250_dwlib.c
index a8bbed74ea70..f4ae262d00fb 100644
--- a/drivers/tty/serial/8250/8250_dwlib.c
+++ b/drivers/tty/serial/8250/8250_dwlib.c
@@ -187,16 +187,10 @@ static int dw8250_rs485_config(struct uart_port *p, struct ktermios *termios,
 	if (rs485->flags & SER_RS485_ENABLED) {
 		tcr |= DW_UART_TCR_RS485_EN;
 
-		if (rs485->flags & SER_RS485_RX_DURING_TX) {
+		if (rs485->flags & SER_RS485_RX_DURING_TX)
 			tcr |= DW_UART_TCR_XFER_MODE_DE_DURING_RE;
-		} else {
-			/* HW does not support same DE level for tx and rx */
-			if (!(rs485->flags & SER_RS485_RTS_ON_SEND) ==
-			    !(rs485->flags & SER_RS485_RTS_AFTER_SEND))
-				return -EINVAL;
-
+		else
 			tcr |= DW_UART_TCR_XFER_MODE_DE_OR_RE;
-		}
 		dw8250_writel_ext(p, DW_UART_DE_EN, 1);
 		dw8250_writel_ext(p, DW_UART_RE_EN, 1);
 	} else {
-- 
2.25.1