linux-kernel - [PATCH] tty: serial: fsl_lpuart: Add missing wakeup event reporting

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Message-Id: <20250923141051.2508077-1-sherry.sun@nxp.com>
Date: Tue, 23 Sep 2025 22:10:51 +0800
From: Sherry Sun <sherry.sun@....com>
To: gregkh@...uxfoundation.org,
	jirislaby@...nel.org,
	shenwei.wang@....com,
	peng.fan@....com
Cc: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev
Subject: [PATCH] tty: serial: fsl_lpuart: Add missing wakeup event reporting

Current lpuart wakeup event would not report itself through sysfs as
being the source of wakeup, so add pm_wakeup_event() to support this.

Signed-off-by: Sherry Sun <sherry.sun@....com>
---
 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 c9519e649e82..9625997758e1 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -3087,7 +3087,9 @@ 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;
 	u32 stat;
+	bool wake_active;
 
 	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 || stat & 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);
 		}
 	}
 
-- 
2.34.1