tty: serial: fsl_lpuart: Add missing wakeup event reporting

Current lpuart 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/20250924025607.2515833-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index c9519e649e826819a3c05c637e8fa33b35f6d067..1bd7ec9c81ea4b71134f1f5148bc5d6a74873692 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -3087,6 +3087,8 @@ static int lpuart_suspend_noirq(struct device *dev)
 static int lpuart_resume_noirq(struct device *dev)
 {
        struct lpuart_port *sport = dev_get_drvdata(dev);
+       struct tty_port *port = &sport->port.state->port;
+       bool wake_active;
        u32 stat;
 
        pinctrl_pm_select_default_state(dev);
@@ -3098,6 +3100,12 @@ static int lpuart_resume_noirq(struct device *dev)
                if (lpuart_is_32(sport)) {
                        stat = lpuart32_read(&sport->port, UARTSTAT);
                        lpuart32_write(&sport->port, stat, UARTSTAT);
+
+                       /* check whether lpuart wakeup was triggered */
+                       wake_active = stat & (UARTSTAT_RDRF | UARTSTAT_RXEDGIF);
+
+                       if (wake_active && irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq)))
+                               pm_wakeup_event(tty_port_tty_get(port)->dev, 0);
                }
        }