linux-kernel - [PATCH 6.0 747/862] platform/chrome: cros_ec: Notify the PM of wake events during resume

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Message-Id: <20221019083322.941916152@linuxfoundation.org>
Date:   Wed, 19 Oct 2022 10:33:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jameson Thies <jthies@...gle.com>,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 747/862] platform/chrome: cros_ec: Notify the PM of wake events during resume

From: Jameson Thies <jthies@...gle.com>

[ Upstream commit 8edd2752b0aa498b3a61f3caee8f79f7e0567fad ]

cros_ec_handle_event in the cros_ec driver can notify the PM of wake
events. When a device is suspended, cros_ec_handle_event will not check
MKBP events. Instead, received MKBP events are checked during resume by
cros_ec_report_events_during_suspend. But
cros_ec_report_events_during_suspend cannot notify the PM if received
events are wake events, causing wake events to not be reported if
received while the device is suspended.

Update cros_ec_report_events_during_suspend to notify the PM of wake
events during resume by calling pm_wakeup_event.

Signed-off-by: Jameson Thies <jthies@...gle.com>
Reviewed-by: Prashant Malani <pmalani@...omium.org>
Reviewed-by: Benson Leung <bleung@...omium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
Link: https://lore.kernel.org/r/20220913204954.2931042-1-jthies@google.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/chrome/cros_ec.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
index 8aace50d446d..110df0fd4b00 100644
--- a/drivers/platform/chrome/cros_ec.c
+++ b/drivers/platform/chrome/cros_ec.c
@@ -349,10 +349,16 @@ EXPORT_SYMBOL(cros_ec_suspend);
 
 static void cros_ec_report_events_during_suspend(struct cros_ec_device *ec_dev)
 {
+	bool wake_event;
+
 	while (ec_dev->mkbp_event_supported &&
-	       cros_ec_get_next_event(ec_dev, NULL, NULL) > 0)
+	       cros_ec_get_next_event(ec_dev, &wake_event, NULL) > 0) {
 		blocking_notifier_call_chain(&ec_dev->event_notifier,
 					     1, ec_dev);
+
+		if (wake_event && device_may_wakeup(ec_dev->dev))
+			pm_wakeup_event(ec_dev->dev, 0);
+	}
 }
 
 /**
-- 
2.35.1