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 6.0-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_config.patch and it can be found in the queue-6.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 3a939433ddc1bab98be028903aaa286e5e7461d7 Mon Sep 17 00:00:00 2001 From: Lukas Wunner <lukas@xxxxxxxxx> Date: Sun, 11 Sep 2022 11:12:15 +0200 Subject: serial: ar933x: Deassert Transmit Enable on ->rs485_config() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Lukas Wunner <lukas@xxxxxxxxx> commit 3a939433ddc1bab98be028903aaa286e5e7461d7 upstream. 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> --- drivers/tty/serial/ar933x_uart.c | 7 +++++++ 1 file changed, 7 insertions(+) --- 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 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; } Patches currently in stable-queue which might be from lukas@xxxxxxxxx are queue-6.0/serial-ar933x-deassert-transmit-enable-on-rs485_config.patch queue-6.0/serial-stm32-deassert-transmit-enable-on-rs485_config.patch queue-6.0/serial-deassert-transmit-enable-on-probe-in-driver-specific-way.patch