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 <[email protected]> Signed-off-by: Vishwanath BS <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: Ben Dooks <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
