In current i2c core driver, pm_runtime_set_active call from i2c_device_pm_resume
is not balanced by pm_runtime_set_suspended call from i2c_device_pm_suspend.
pm_runtime_set_active called from resume path will increase the child_count of
the device's parent. However, matching pm_runtime_set_suspended is not called
in suspend routine because of which child_count of the device's parent
is not balanced, preventing the parent device to idle.
Issue has been fixed by adding pm_runtime_set_suspended call inside suspend
reoutine which will make sure that child_counts are balanced.
This fix has been tested on OMAP4430.
Signed-off-by: Partha Basak <p-basak2@xxxxxx>
Signed-off-by: Vishwanath BS <vishwanath.bs@xxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
Cc: Ben Dooks <ben-linux@xxxxxxxxx>
---
drivers/i2c/i2c-core.c | 12 ++++++++++--
1 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 6649176..3146bff
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -196,14 +196,22 @@ static int i2c_legacy_resume(struct device *dev)
static int i2c_device_pm_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+ int ret;
if (pm_runtime_suspended(dev))
return 0;
if (pm)
- return pm->suspend ? pm->suspend(dev) : 0;
+ ret = pm->suspend ? pm->suspend(dev) : 0;
+ else
+ ret = i2c_legacy_suspend(dev, PMSG_SUSPEND);
- return i2c_legacy_suspend(dev, PMSG_SUSPEND);
+ if (!ret) {
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_enable(dev);
+ }
+ return ret;
}
static int i2c_device_pm_resume(struct device *dev)
--
1.7.0.4
--
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