From 18bdfccf3c30b208b65b890f75ecc76fcb79e224 Mon Sep 17 00:00:00 2001 From: Sherry Sun Date: Wed, 24 Sep 2025 10:56:07 +0800 Subject: [PATCH] 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 Reviewed-by: Frank Li Link: https://patch.msgid.link/20250924025607.2515833-1-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/fsl_lpuart.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index c9519e649e826..1bd7ec9c81ea4 100644 --- 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); } } -- 2.47.3