Re: [PATCH 6.1.y] tty: serial: imx: Fix broken RS485

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Mar 27, 2024 at 07:54:59PM +0100, Christoph Niedermaier wrote:
> From: Rickard x Andersson <rickaran@axis.com>
> 
> When about to transmit the function imx_uart_start_tx is called and in
> some RS485 configurations this function will call imx_uart_stop_rx. The
> problem is that imx_uart_stop_rx will enable loopback in order to
> release the RS485 bus, but when loopback is enabled transmitted data
> will just be looped to RX.
> 
> This patch fixes the above problem by not enabling loopback when about
> to transmit.
> 
> This driver now works well when used for RS485 half duplex master
> configurations.
> 
> Fixes: 79d0224f6bf2 ("tty: serial: imx: Handle RS485 DE signal active high")
> Cc: stable <stable@kernel.org>
> Signed-off-by: Rickard x Andersson <rickaran@axis.com>
> Tested-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
> Link: https://lore.kernel.org/r/20240221115304.509811-1-rickaran@axis.com
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> (cherry picked from commit 672448ccf9b6a676f96f9352cbf91f4d35f4084a)
> Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
> ---
>  drivers/tty/serial/imx.c | 22 ++++++++++++++++++----
>  1 file changed, 18 insertions(+), 4 deletions(-)

Both now queued up, thanks!

greg k-h