From: Lukas Wunner lukas@wunner.de
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(+)
--- 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; }