tty: serial: imx: Add missing wakeup event reporting

Current imx uart wakeup event would not report itself as wakeup source
through sysfs. Add pm_wakeup_event() to support it.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20251002045259.2725461-3-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 90e2ea1e8afe5c6fcac1721fff2e929180853498..c488e5d372ffd30611b02550c3aadfb57383b065 100644 (file)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -30,7 +30,7 @@
 #include <linux/iopoll.h>
 #include <linux/dma-mapping.h>
 
-#include <asm/irq.h>
+#include <linux/irq.h>
 #include <linux/dma/imx-dma.h>
 
 #include "serial_mctrl_gpio.h"
@@ -2699,8 +2699,8 @@ static void imx_uart_enable_wakeup(struct imx_port *sport, bool on)
 {
        struct tty_port *port = &sport->port.state->port;
        struct device *tty_dev;
-       bool may_wake = false;
-       u32 ucr3;
+       bool may_wake = false, wake_active = false;
+       u32 ucr3, usr1;
 
        scoped_guard(tty_port_tty, port) {
                struct tty_struct *tty = scoped_tty();
@@ -2715,12 +2715,14 @@ static void imx_uart_enable_wakeup(struct imx_port *sport, bool on)
 
        uart_port_lock_irq(&sport->port);
 
+       usr1 = imx_uart_readl(sport, USR1);
        ucr3 = imx_uart_readl(sport, UCR3);
        if (on) {
                imx_uart_writel(sport, USR1_AWAKE, USR1);
                ucr3 |= UCR3_AWAKEN;
        } else {
                ucr3 &= ~UCR3_AWAKEN;
+               wake_active = usr1 & USR1_AWAKE;
        }
        imx_uart_writel(sport, ucr3, UCR3);
 
@@ -2731,10 +2733,14 @@ static void imx_uart_enable_wakeup(struct imx_port *sport, bool on)
                        ucr1 |= UCR1_RTSDEN;
                } else {
                        ucr1 &= ~UCR1_RTSDEN;
+                       wake_active = wake_active || (usr1 & USR1_RTSD);
                }
                imx_uart_writel(sport, ucr1, UCR1);
        }
 
+       if (wake_active && irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq)))
+               pm_wakeup_event(tty_port_tty_get(port)->dev, 0);
+
        uart_port_unlock_irq(&sport->port);
 }