linux-kernel - [PATCH v2 3/7] serial: core: set missing supported flag for RX during TX GPIO

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Date:   Wed, 11 Oct 2023 19:38:25 +0200
From:   Lino Sanfilippo <l.sanfilippo@...bus.com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        ilpo.jarvinen@...ux.intel.com
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de,
        mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com,
        cniedermaier@...electronics.com, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, LinoSanfilippo@....de,
        lukas@...ner.de, p.rosenberger@...bus.com,
        Lino Sanfilippo <l.sanfilippo@...bus.com>,
        stable@...r.kernel.org
Subject: [PATCH v2 3/7] serial: core: set missing supported flag for RX during TX GPIO

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@...r.kernel.org
Fixes: 163f080eb717 ("serial: core: Add option to output RS485 RX_DURING_TX state via GPIO")
Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.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 ef0500be3553..697c36dc7ec8 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3622,6 +3622,8 @@ 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;
 }
-- 
2.40.1