linux-kernel - [PATCH v2 8/8] mfd: cros_ec_i2c: moving the system sleep pm ops to late

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Date:   Fri, 23 Feb 2018 16:11:22 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     lee.jones@...aro.org
Cc:     groeck@...omium.org, gwendal@...omium.org, kernel@...labora.com,
        linux-kernel@...r.kernel.org, Joseph Lo <josephl@...dia.com>
Subject: [PATCH v2 8/8] mfd: cros_ec_i2c: moving the system sleep pm ops to late

From: Joseph Lo <josephl@...dia.com>

The cros_ec_i2c driver is still active after it had suspended or before it
resumes. Besides that, it also tried to transfer data even after the I2C
host had been suspended. This will lead the system to crash.

During the test, we also observe that the EC needs to be resumed earlier
due to some status polling from the EC FW (e.g. battery status). So we
move the PM ops to late stage to make it work normally.

Signed-off-by: Joseph Lo <josephl@...dia.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---

Changes in v2:
- [8/8] This patch is new in this series replacing [5/6] of v1.

 drivers/mfd/cros_ec_i2c.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/cros_ec_i2c.c b/drivers/mfd/cros_ec_i2c.c
index 9248490504a9..56fc66712e9b 100644
--- a/drivers/mfd/cros_ec_i2c.c
+++ b/drivers/mfd/cros_ec_i2c.c
@@ -342,8 +342,9 @@ static int cros_ec_i2c_resume(struct device *dev)
 }
 #endif
 
-static SIMPLE_DEV_PM_OPS(cros_ec_i2c_pm_ops, cros_ec_i2c_suspend,
-			  cros_ec_i2c_resume);
+const struct dev_pm_ops cros_ec_i2c_pm_ops = {
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_i2c_suspend, cros_ec_i2c_resume)
+};
 
 #ifdef CONFIG_OF
 static const struct of_device_id cros_ec_i2c_of_match[] = {
-- 
2.16.1