This is a note to let you know that I've just added the patch titled
serial: ar933x: Deassert Transmit Enable on ->rs485_config()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-ar933x-deassert-transmit-enable-on-rs485_conf.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ed5a30b1b62a514b606e883884676bac9b544c25
Author: Lukas Wunner <lukas@xxxxxxxxx>
Date: Sun Sep 11 11:12:15 2022 +0200
serial: ar933x: Deassert Transmit Enable on ->rs485_config()
[ Upstream commit 3a939433ddc1bab98be028903aaa286e5e7461d7 ]
The ar933x_uart driver neglects to deassert Transmit Enable when
->rs485_config() is invoked. Fix it.
Fixes: 9be1064fe524 ("serial: ar933x_uart: add RS485 support")
Cc: stable@xxxxxxxxxxxxxxx # v5.7+
Cc: Daniel Golle <daniel@xxxxxxxxxxxxxx>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Link: https://lore.kernel.org/r/5b36af26e57553f084334666e7d24c7fd131a01e.1662887231.git.lukas@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index be3f5d8f683b..23f2d9937cfc 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -585,6 +585,13 @@ static const struct uart_ops ar933x_uart_ops = {
static int ar933x_config_rs485(struct uart_port *port,
struct serial_rs485 *rs485conf)
{
+ struct ar933x_uart_port *up =
+ container_of(port, struct ar933x_uart_port, port);
+
+ if (port->rs485.flags & SER_RS485_ENABLED)
+ gpiod_set_value(up->rts_gpiod,
+ !!(rs485conf->flags & SER_RS485_RTS_AFTER_SEND));
+
return 0;
}
