linux-kernel - [BACKPORT 4.4.y 13/25] extcon: usb-gpio: Don't miss event during suspend/resume

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Date:   Fri, 22 Mar 2019 16:44:04 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     stable@...r.kernel.org, MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Roger Quadros <rogerq@...com>, Arnd Bergmann <arnd@...db.de>,
        linux-kernel@...r.kernel.org
Subject: [BACKPORT 4.4.y 13/25] extcon: usb-gpio: Don't miss event during suspend/resume

From: Roger Quadros <rogerq@...com>

Pin state might have changed during suspend/resume while
our interrupts were disabled and if device doesn't support wakeup.

Scan for change during resume for such case.

Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
(cherry picked from commit 04c080080855ce84dcd490a2e04805608a21085d)
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/extcon/extcon-usb-gpio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
index 2b2fecffb1ad..c6a7c9ddf0ac 100644
--- a/drivers/extcon/extcon-usb-gpio.c
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -192,6 +192,9 @@ static int usb_extcon_resume(struct device *dev)
 	}
 
 	enable_irq(info->id_irq);
+	if (!device_may_wakeup(dev))
+		queue_delayed_work(system_power_efficient_wq,
+				   &info->wq_detcable, 0);
 
 	return ret;
 }
-- 
2.20.0