This is a note to let you know that I've just added the patch titled serial: fsl_lpuart: fix RS485 RTS polariy inverse issue to the 5.15-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-fsl_lpuart-fix-rs485-rts-polariy-inverse-issu.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 7c9075294f8dc4ff60fa5dacdc0aaa1826b46414 Author: Shenwei Wang <shenwei.wang@xxxxxxx> Date: Tue Feb 7 10:24:20 2023 -0600 serial: fsl_lpuart: fix RS485 RTS polariy inverse issue [ Upstream commit 3957b9501a5a8fa709ae4a47483714491471f6db ] The previous 'commit 846651eca073 ("serial: fsl_lpuart: RS485 RTS polariy is inverse")' only fixed the inverse issue on lpuart 8bit platforms. This is a follow-up patch to fix the RS485 polarity inverse issue on lpuart 32bit platforms. Fixes: 03895cf41d18 ("tty: serial: fsl_lpuart: Add support for RS-485") Reported-by: Sherry Sun <sherry.sun@xxxxxxx> Signed-off-by: Shenwei Wang <shenwei.wang@xxxxxxx> Link: https://lore.kernel.org/r/20230207162420.3647904-1-shenwei.wang@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 08096d33af8a6..f4d9dc4648da4 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1406,9 +1406,9 @@ static int lpuart32_config_rs485(struct uart_port *port, * Note: UART is assumed to be active high. */ if (rs485->flags & SER_RS485_RTS_ON_SEND) - modem &= ~UARTMODEM_TXRTSPOL; - else if (rs485->flags & SER_RS485_RTS_AFTER_SEND) modem |= UARTMODEM_TXRTSPOL; + else if (rs485->flags & SER_RS485_RTS_AFTER_SEND) + modem &= ~UARTMODEM_TXRTSPOL; } /* Store the new configuration */