PM / Domains: Stop/start devices during system PM suspend/resume in genpd

Not all subsystems/drivers that manages devices attached to a genpd
makes use of the pm_runtime_force_suspend|resume() helper functions
to deal with system PM suspend/resume.

In cases like these and when genpd's ->stop|start() callbacks are
used for the device, invoke the pm_runtime_force_suspend|resume()
helper functions from genpd's "noirq" system PM callbacks. In this
way we make sure to "stop" the device on suspend and to "start" it
on resume.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 4cb57f3..9193aac 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -761,6 +761,7 @@ static int pm_genpd_prepare(struct device *dev)
 static int pm_genpd_suspend_noirq(struct device *dev)
 {
        struct generic_pm_domain *genpd;
+       int ret;
 
        dev_dbg(dev, "%s()\n", __func__);
 
@@ -771,6 +772,12 @@ static int pm_genpd_suspend_noirq(struct device *dev)
        if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))
                return 0;
 
+       if (genpd->dev_ops.stop && genpd->dev_ops.start) {
+               ret = pm_runtime_force_suspend(dev);
+               if (ret)
+                       return ret;
+       }
+
        /*
         * Since all of the "noirq" callbacks are executed sequentially, it is
         * guaranteed that this function will never run twice in parallel for
@@ -791,6 +798,7 @@ static int pm_genpd_suspend_noirq(struct device *dev)
 static int pm_genpd_resume_noirq(struct device *dev)
 {
        struct generic_pm_domain *genpd;
+       int ret = 0;
 
        dev_dbg(dev, "%s()\n", __func__);
 
@@ -809,7 +817,10 @@ static int pm_genpd_resume_noirq(struct device *dev)
        pm_genpd_sync_poweron(genpd, true);
        genpd->suspended_count--;
 
-       return 0;
+       if (genpd->dev_ops.stop && genpd->dev_ops.start)
+               ret = pm_runtime_force_resume(dev);
+
+       return ret;
 }
 
 /**
@@ -824,6 +835,7 @@ static int pm_genpd_resume_noirq(struct device *dev)
 static int pm_genpd_freeze_noirq(struct device *dev)
 {
        struct generic_pm_domain *genpd;
+       int ret = 0;
 
        dev_dbg(dev, "%s()\n", __func__);
 
@@ -831,7 +843,10 @@ static int pm_genpd_freeze_noirq(struct device *dev)
        if (IS_ERR(genpd))
                return -EINVAL;
 
-       return 0;
+       if (genpd->dev_ops.stop && genpd->dev_ops.start)
+               ret = pm_runtime_force_suspend(dev);
+
+       return ret;
 }
 
 /**
@@ -844,6 +859,7 @@ static int pm_genpd_freeze_noirq(struct device *dev)
 static int pm_genpd_thaw_noirq(struct device *dev)
 {
        struct generic_pm_domain *genpd;
+       int ret = 0;
 
        dev_dbg(dev, "%s()\n", __func__);
 
@@ -851,7 +867,10 @@ static int pm_genpd_thaw_noirq(struct device *dev)
        if (IS_ERR(genpd))
                return -EINVAL;
 
-       return 0;
+       if (genpd->dev_ops.stop && genpd->dev_ops.start)
+               ret = pm_runtime_force_resume(dev);
+
+       return ret;
 }
 
 /**
@@ -864,6 +883,7 @@ static int pm_genpd_thaw_noirq(struct device *dev)
 static int pm_genpd_restore_noirq(struct device *dev)
 {
        struct generic_pm_domain *genpd;
+       int ret = 0;
 
        dev_dbg(dev, "%s()\n", __func__);
 
@@ -889,7 +909,10 @@ static int pm_genpd_restore_noirq(struct device *dev)
 
        pm_genpd_sync_poweron(genpd, true);
 
-       return 0;
+       if (genpd->dev_ops.stop && genpd->dev_ops.start)
+               ret = pm_runtime_force_resume(dev);
+
+       return ret;
 }
 
 /**