[RESEND PATCH v4 2/7] serial: core: set missing supported flag for RX during TX GPIO

From: Lino Sanfilippo
Date: Sun Nov 19 2023 - 06:33:02 EST


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@xxxxxxxxxxxxxxx
Fixes: 163f080eb717 ("serial: core: Add option to output RS485 RX_DURING_TX state via GPIO")
Signed-off-by: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
---
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 ab766f48c172..af175c803c22 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3627,6 +3627,8 @@ int uart_get_rs485_mode(struct uart_port *port)
if (IS_ERR(desc))
return dev_err_probe(dev, PTR_ERR(desc), "Cannot get rs485-rx-during-tx-gpios\n");
port->rs485_rx_during_tx_gpio = desc;
+ if (port->rs485_rx_during_tx_gpio)
+ port->rs485_supported.flags |= SER_RS485_RX_DURING_TX;

return 0;
}
--
2.42.0