The patch below does not apply to the 5.10-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@xxxxxxxxxxxxxxx>.
Possible dependencies:
3a939433ddc1 ("serial: ar933x: Deassert Transmit Enable on ->rs485_config()")
184842622c97 ("serial: ar933x: Remove superfluous code in ar933x_config_rs485()")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 3a939433ddc1bab98be028903aaa286e5e7461d7 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@xxxxxxxxx>
Date: Sun, 11 Sep 2022 11:12:15 +0200
Subject: [PATCH] serial: ar933x: Deassert Transmit Enable on ->rs485_config()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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>
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 0a4020dba165..925484a42c82 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -583,6 +583,13 @@ static const struct uart_ops ar933x_uart_ops = {
static int ar933x_config_rs485(struct uart_port *port, struct ktermios *termios,
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;
}
