linux-kernel - [PATCH v2 4/4] PM: domains: Drop/restore performance state votes for devices at system PM

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Date:   Thu,  3 Jun 2021 11:34:38 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Dmitry Osipenko <digetx@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Roja Rani Yarubandi <rojay@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] PM: domains: Drop/restore performance state votes for devices at system PM

Recent changes in genpd drops and restore performance state votes for
devices during runtime PM.

For the similar reasons, but to avoid the same kind of boilerplate code in
device PM callbacks for system sleep in subsystems/drivers, let's drop and
restore performance states votes in genpd for the attached devices during
system sleep.

Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---

Changes in v2:
	- Rebased.
	- A few cosmetic changes.

---
 drivers/base/power/domain.c | 9 +++++++++
 include/linux/pm_domain.h   | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index e5d97174c254..a33e5b341f3f 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1171,6 +1171,7 @@ static int genpd_prepare(struct device *dev)
  */
 static int genpd_finish_suspend(struct device *dev, bool poweroff)
 {
+	struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
 	struct generic_pm_domain *genpd;
 	int ret = 0;
 
@@ -1201,6 +1202,7 @@ static int genpd_finish_suspend(struct device *dev, bool poweroff)
 	}
 
 	genpd_lock(genpd);
+	gpd_data->pm_pstate = genpd_drop_performance_state(dev);
 	genpd->suspended_count++;
 	genpd_sync_power_off(genpd, true, 0);
 	genpd_unlock(genpd);
@@ -1245,6 +1247,7 @@ static int genpd_resume_noirq(struct device *dev)
 	genpd_lock(genpd);
 	genpd_sync_power_on(genpd, true, 0);
 	genpd->suspended_count--;
+	genpd_restore_performance_state(dev, dev_gpd_data(dev)->pm_pstate);
 	genpd_unlock(genpd);
 
 	if (genpd->dev_ops.stop && genpd->dev_ops.start &&
@@ -1364,6 +1367,7 @@ static int genpd_restore_noirq(struct device *dev)
 	}
 
 	genpd_sync_power_on(genpd, true, 0);
+	genpd_restore_performance_state(dev, dev_gpd_data(dev)->pm_pstate);
 	genpd_unlock(genpd);
 
 	if (genpd->dev_ops.stop && genpd->dev_ops.start &&
@@ -1409,23 +1413,28 @@ static void genpd_complete(struct device *dev)
 static void genpd_switch_state(struct device *dev, bool suspend)
 {
 	struct generic_pm_domain *genpd;
+	struct generic_pm_domain_data *gpd_data;
 	bool use_lock;
 
 	genpd = dev_to_genpd_safe(dev);
 	if (!genpd)
 		return;
 
+	gpd_data = dev_gpd_data(dev);
+
 	use_lock = genpd_is_irq_safe(genpd);
 
 	if (use_lock)
 		genpd_lock(genpd);
 
 	if (suspend) {
+		gpd_data->pm_pstate = genpd_drop_performance_state(dev);
 		genpd->suspended_count++;
 		genpd_sync_power_off(genpd, use_lock, 0);
 	} else {
 		genpd_sync_power_on(genpd, use_lock, 0);
 		genpd->suspended_count--;
+		genpd_restore_performance_state(dev, gpd_data->pm_pstate);
 	}
 
 	if (use_lock)
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 21a0577305ef..f6e9dc28621c 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -199,6 +199,7 @@ struct generic_pm_domain_data {
 	int cpu;
 	unsigned int performance_state;
 	unsigned int rpm_pstate;
+	unsigned int pm_pstate;
 	ktime_t	next_wakeup;
 	void *data;
 };
-- 
2.25.1