tty: serial: imx: clear the RTSD status before enable the RTSD irq

Clear RTSD status before enabling the irq event for RTSD in
imx_uart_enable_wakeup function.
Since RTSD can be set as the wakeup source, this can avoid any risk of
false triggering of a wake-up interrupts.

Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20211125014306.4432-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 90f82e6..fb75e3e 100644 (file)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2482,10 +2482,12 @@ static void imx_uart_enable_wakeup(struct imx_port *sport, bool on)
 
        if (sport->have_rtscts) {
                u32 ucr1 = imx_uart_readl(sport, UCR1);
-               if (on)
+               if (on) {
+                       imx_uart_writel(sport, USR1_RTSD, USR1);
                        ucr1 |= UCR1_RTSDEN;
-               else
+               } else {
                        ucr1 &= ~UCR1_RTSDEN;
+               }
                imx_uart_writel(sport, ucr1, UCR1);
        }
 }