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serial: core: set missing supported flag for RX during TX GPIO

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[ Upstream commit 1a33e33ca0e80d485458410f149265cdc0178cfa ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lino Sanfilippo 2024-01-03 07:18:13 +01:00 committed by Greg Kroah-Hartman
parent 28c85cd0a6
commit 9744575e69
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/serial_core.c
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@ -3630,6 +3630,8 @@ 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;
}