From 028fcabd8a67196277f907c8ecce8e0bb99b276a Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@wunner.de>
Date: Sat, 5 Nov 2022 09:46:40 -0400
Subject: [PATCH] serial: ar933x: Deassert Transmit Enable on ->rs485_config()
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commit 3a939433ddc1bab98be028903aaa286e5e7461d7 upstream.

The ar933x_uart driver neglects to deassert Transmit Enable when
->rs485_config() is invoked.  Fix it.

Fixes: 9be1064fe524 ("serial: ar933x_uart: add RS485 support")
Cc: stable@vger.kernel.org # v5.7+
Cc: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Ilpo JÀrvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/tty/serial/ar933x_uart.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index c2be7cf91399..fcbaff894193 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -593,6 +593,11 @@ static int ar933x_config_rs485(struct uart_port *port,
 		dev_err(port->dev, "RS485 needs rts-gpio\n");
 		return 1;
 	}
+
+	if (rs485conf->flags & SER_RS485_ENABLED)
+		gpiod_set_value(up->rts_gpiod,
+			!!(rs485conf->flags & SER_RS485_RTS_AFTER_SEND));
+
 	port->rs485 = *rs485conf;
 	return 0;
 }