From 0ba9e3a13c6adfa99e32b2576d20820ab10ad48a Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 14 Apr 2023 10:02:39 -0700
Subject: [PATCH] serial: 8250: Add missing wakeup event reporting
Git-commit: 0ba9e3a13c6adfa99e32b2576d20820ab10ad48a
Patch-mainline: v6.4-rc1
References: git-fixes

An 8250 UART configured as a wake-up source would not have reported
itself through sysfs as being the source of wake-up, correct that.

Fixes: b3b708fa2780 ("wake up from a serial port")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230414170241.2016255-1-f.fainelli@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/tty/serial/8250/8250_port.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -15,6 +15,7 @@
 #include <linux/moduleparam.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
+#include <linux/irq.h>
 #include <linux/console.h>
 #include <linux/gpio/consumer.h>
 #include <linux/sysrq.h>
@@ -1899,6 +1900,7 @@ int serial8250_handle_irq(struct uart_po
 {
 	unsigned char status;
 	struct uart_8250_port *up = up_to_u8250p(port);
+	struct tty_port *tport = &port->state->port;
 	bool skip_rx = false;
 	unsigned long flags;
 
@@ -1923,6 +1925,8 @@ int serial8250_handle_irq(struct uart_po
 		skip_rx = true;
 
 	if (status & (UART_LSR_DR | UART_LSR_BI) && !skip_rx) {
+		if (irqd_is_wakeup_set(irq_get_irq_data(port->irq)))
+			pm_wakeup_event(tport->tty->dev, 0);
 		if (!up->dma || handle_rx_dma(up, iir))
 			status = serial8250_rx_chars(up, status);
 	}