With runtime PM, the devices get suspended while the system is up and running in order to save power. At such times, it is important to re-evaluate the required performance state of the domain, in order to choose a lower state if possible.
This patch updates the genpd suspend/resume callbacks to do that.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/base/power/domain.c | 19 +++++++++++++++++-- include/linux/pm_domain.h | 1 + 2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index f460be4ca5f7..ef4062927713 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -576,7 +576,8 @@ static int genpd_runtime_suspend(struct device *dev) { struct generic_pm_domain *genpd; bool (*suspend_ok)(struct device *__dev); - struct gpd_timing_data *td = &dev_gpd_data(dev)->td; + struct generic_pm_domain_data *pd_data = dev_gpd_data(dev); + struct gpd_timing_data *td = &pd_data->td; bool runtime_pm = pm_runtime_enabled(dev); ktime_t time_start; s64 elapsed_ns; @@ -633,7 +634,14 @@ static int genpd_runtime_suspend(struct device *dev) return 0;
genpd_lock(genpd); + + /* Re-evaluate performance state of the domain */ + pd_data->cached_performance_state = pd_data->performance_state; + pd_data->performance_state = 0; + update_domain_performance_state(genpd); + genpd_poweroff(genpd, false); + genpd_unlock(genpd);
return 0; @@ -650,7 +658,8 @@ static int genpd_runtime_suspend(struct device *dev) static int genpd_runtime_resume(struct device *dev) { struct generic_pm_domain *genpd; - struct gpd_timing_data *td = &dev_gpd_data(dev)->td; + struct generic_pm_domain_data *pd_data = dev_gpd_data(dev); + struct gpd_timing_data *td = &pd_data->td; bool runtime_pm = pm_runtime_enabled(dev); ktime_t time_start; s64 elapsed_ns; @@ -673,7 +682,13 @@ static int genpd_runtime_resume(struct device *dev) }
genpd_lock(genpd); + ret = genpd_poweron(genpd, 0); + + /* Re-evaluate performance state of the domain */ + pd_data->performance_state = pd_data->cached_performance_state; + update_domain_performance_state(genpd); + genpd_unlock(genpd);
if (ret) diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index d994ad5ba1c0..69b453d44adb 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -122,6 +122,7 @@ struct generic_pm_domain_data { struct notifier_block nb; struct notifier_block perf_nb; unsigned int performance_state; + unsigned int cached_performance_state; };
#ifdef CONFIG_PM_GENERIC_DOMAINS