serial: ar933x: Deassert Transmit Enable on ->rs485_config()

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>

diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 4379ca4..0f26776 100644 (file)
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -591,6 +591,11 @@ 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;
 }