From 632f7ce3f9b65039ac6c4f14ef91a0a1f3bdff59 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 20 Mar 2015 15:55:12 +0100 Subject: PM / Domains: Sync runtime PM status with genpd after probe Buses which currently supports attaching devices to their PM domains, will invoke the dev_pm_domain_attach() API from their ->probe() callbacks. During the attach procedure, genpd power up the PM domain. In those scenarios where the bus/driver don't need to access its device during probe, it may leave it in runtime PM suspended state since that's also the default state. In that way, no notifications through the runtime PM callbacks will reach the PM domain during probe. For genpd, the consequence from the above scenario means the PM domain will remain powered. Therefore, implement the struct dev_pm_domain's ->sync() callback, which is invoked from driver core after the bus/driver has probed the device. It allows genpd to power off the PM domain if it's unused. Signed-off-by: Russell King [ Ulf: Updated patch according to updates in driver core ] Signed-off-by: Ulf Hansson Acked-by: Kevin Hilman Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 45937f88e77c..295ff7189504 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -2130,6 +2130,17 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off) genpd_queue_power_off_work(pd); } +static void genpd_dev_pm_sync(struct device *dev) +{ + struct generic_pm_domain *pd; + + pd = dev_to_genpd(dev); + if (IS_ERR(pd)) + return; + + genpd_queue_power_off_work(pd); +} + /** * genpd_dev_pm_attach - Attach a device to its PM domain using DT. * @dev: Device to attach. @@ -2196,6 +2207,7 @@ int genpd_dev_pm_attach(struct device *dev) } dev->pm_domain->detach = genpd_dev_pm_detach; + dev->pm_domain->sync = genpd_dev_pm_sync; pm_genpd_poweron(pd); return 0; -- cgit v1.2.3