The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 1a33e33ca0e80d485458410f149265cdc0178cfa # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024012243-scorch-bundle-08dd@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

1a33e33ca0e8 ("serial: core: set missing supported flag for RX during TX GPIO") 7cda0b9eb6eb ("serial: core: Simplify uart_get_rs485_mode()")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 1a33e33ca0e80d485458410f149265cdc0178cfa Mon Sep 17 00:00:00 2001 From: Lino Sanfilippo l.sanfilippo@kunbus.com Date: Wed, 3 Jan 2024 07:18:13 +0100 Subject: [PATCH] serial: core: set missing supported flag for RX during TX GPIO MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

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

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 8d381c283cec..850f24cc53e5 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -3649,6 +3649,8 @@ 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; }