linux-kernel - Re: [PATCH v5 2/7] serial: core: set missing supported flag for RX during TX GPIO

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Date:   Mon, 11 Dec 2023 12:36:59 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Lino Sanfilippo <l.sanfilippo@...bus.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        u.kleine-koenig@...gutronix.de, shawnguo@...nel.org,
        s.hauer@...gutronix.de, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com, cniedermaier@...electronics.com,
        hugo@...ovil.com, LKML <linux-kernel@...r.kernel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        LinoSanfilippo@....de, Lukas Wunner <lukas@...ner.de>,
        p.rosenberger@...bus.com, stable@...r.kernel.org
Subject: Re: [PATCH v5 2/7] serial: core: set missing supported flag for RX
 during TX GPIO

On Sat, 9 Dec 2023, Lino Sanfilippo wrote:

> 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 a0290a5fe8b3..c254e88c8452 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3632,6 +3632,8 @@ 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;
>  }

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.