If the RS485 feature RX-during-TX is supported by means of a GPIO set the according supported flag. Otherwise setting this feature from userspace may not be possible, since in uart_sanitize_serial_rs485() the passed RS485 configuration is matched against the supported features and unsupported settings are thereby removed and thus take no effect.
Cc: stable@vger.kernel.org Fixes: 163f080eb717 ("serial: core: Add option to output RS485 RX_DURING_TX state via GPIO") Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Lino Sanfilippo l.sanfilippo@kunbus.com Link: https://lore.kernel.org/r/20240103061818.564-3-l.sanfilippo@kunbus.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org (cherry picked from commit 1a33e33ca0e80d485458410f149265cdc0178cfa) Signed-off-by: Lino Sanfilippo l.sanfilippo@kunbus.com --- drivers/tty/serial/serial_core.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index f912f8bf1e63..4a783d4f28f3 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -3625,6 +3625,8 @@ int uart_get_rs485_mode(struct uart_port *port) port->rs485_rx_during_tx_gpio = NULL; return dev_err_probe(dev, ret, "Cannot get rs485-rx-during-tx-gpios\n"); } + if (port->rs485_rx_during_tx_gpio) + port->rs485_supported.flags |= SER_RS485_RX_DURING_TX;
return 0; }