From: Lukas Wunner <lukas@xxxxxxxxx>
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@xxxxxxxxxxxxxxx # v5.7+
Cc: Daniel Golle <daniel@xxxxxxxxxxxxxx>
Reviewed-by: Ilpo JÀrvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/tty/serial/ar933x_uart.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -593,6 +593,11 @@ static int ar933x_config_rs485(struct ua
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;
}
