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@nxp.com>
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Link: https://lore.kernel.org/r/20230207162420.3647904-1-shenwei.wang@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index f6ac468..13a6cd0 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1393,9 +1393,9 @@ static int lpuart32_config_rs485(struct uart_port *port, struct ktermios *termio
                 * 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;
        }
 
        lpuart32_write(&sport->port, modem, UARTMODIR);