Commit 3957b950 authored by Shenwei Wang's avatar Shenwei Wang Committed by Greg Kroah-Hartman
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serial: fsl_lpuart: fix RS485 RTS polariy inverse issue 



The previous 'commit 846651ec ("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: 03895cf4 ("tty: serial: fsl_lpuart: Add support for RS-485")
Reported-by: default avatarSherry Sun <sherry.sun@nxp.com>
Signed-off-by: default avatarShenwei Wang <shenwei.wang@nxp.com>
Link: https://lore.kernel.org/r/20230207162420.3647904-1-shenwei.wang@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f6b2ce79

drivers/tty/serial/fsl_lpuart.c

+2 −2
Original line number Diff line number Diff line
@@ -1413,9 +1413,9 @@ 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);