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 Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Lukas Wunner lukas@wunner.de Link: https://lore.kernel.org/r/5b36af26e57553f084334666e7d24c7fd131a01e.166288723... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/ar933x_uart.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/drivers/tty/serial/ar933x_uart.c +++ b/drivers/tty/serial/ar933x_uart.c @@ -583,6 +583,13 @@ static const struct uart_ops ar933x_uart static int ar933x_config_rs485(struct uart_port *port, struct ktermios *termios, struct serial_rs485 *rs485conf) { + struct ar933x_uart_port *up = + container_of(port, struct ar933x_uart_port, port); + + if (port->rs485.flags & SER_RS485_ENABLED) + gpiod_set_value(up->rts_gpiod, + !!(rs485conf->flags & SER_RS485_RTS_AFTER_SEND)); + return 0; }