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