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authorUlf Hansson2016-05-30 11:33:13 +0200
committerRafael J. Wysocki2016-06-16 15:14:36 +0200
commit4d23a5e84806b202d9231929c9507ef7cf7a0185 (patch)
tree5575c3bdbd0cdcaf743203117340aa621d89f729 /drivers/base
parent9f5b52747dbf83816dcd29ea1700813aeb668c0f (diff)
PM / Domains: Allow runtime PM during system PM phases
In cases when a PM domain isn't powered off when genpd's ->prepare() callback is invoked, genpd runtime resumes and disables runtime PM for the device. This behaviour was needed when genpd managed intermediate states during the power off sequence, as to maintain proper low power states of devices during system PM suspend/resume. Commit ba2bbfbf6307 (PM / Domains: Remove intermediate states from the power off sequence), enables genpd to improve its behaviour in that respect. The PM core disables runtime PM at __device_suspend_late() before it calls a system PM "late" callback for a device. When resuming a device, after a corresponding "early" callback has been invoked, the PM core re-enables runtime PM. By changing genpd to allow runtime PM according to the same system PM phases as the PM core, devices can be runtime resumed by their corresponding subsystem/driver when really needed. In this way, genpd no longer need to runtime resume the device from its ->prepare() callback. In most cases that avoids unnecessary and energy- wasting operations of runtime resuming devices that have nothing to do, only to runtime suspend them shortly after. Although, because of changing this behaviour in genpd and due to that genpd powers on the PM domain unconditionally in the system PM resume "noirq" phase, it could potentially cause a PM domain to stay powered on even if it's unused after the system has resumed. To avoid this, schedule a power off work when genpd's system PM ->complete() callback has been invoked for the last device in the PM domain. 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>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c34
1 files changed, 8 insertions, 26 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 60a9971fc474..4cb57f3f0ee3 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -739,21 +739,6 @@ static int pm_genpd_prepare(struct device *dev)
mutex_unlock(&genpd->lock);
- /*
- * Even if the PM domain is powered off at this point, we can't expect
- * it to remain in that state during the entire system PM suspend
- * phase. Any subsystem/driver for a device in the PM domain, may still
- * need to serve a request which may require the device to be runtime
- * resumed and its PM domain to be powered.
- *
- * As we are disabling runtime PM at this point, we are preventing the
- * subsystem/driver to decide themselves. For that reason, we need to
- * make sure the device is operational as it may be required in some
- * cases.
- */
- pm_runtime_resume(dev);
- __pm_runtime_disable(dev, false);
-
ret = pm_generic_prepare(dev);
if (ret) {
mutex_lock(&genpd->lock);
@@ -761,7 +746,6 @@ static int pm_genpd_prepare(struct device *dev)
genpd->prepared_count--;
mutex_unlock(&genpd->lock);
- pm_runtime_enable(dev);
}
return ret;
@@ -787,8 +771,6 @@ static int pm_genpd_suspend_noirq(struct device *dev)
if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))
return 0;
- genpd_stop_dev(genpd, dev);
-
/*
* Since all of the "noirq" callbacks are executed sequentially, it is
* guaranteed that this function will never run twice in parallel for
@@ -827,7 +809,7 @@ static int pm_genpd_resume_noirq(struct device *dev)
pm_genpd_sync_poweron(genpd, true);
genpd->suspended_count--;
- return genpd_start_dev(genpd, dev);
+ return 0;
}
/**
@@ -849,7 +831,7 @@ static int pm_genpd_freeze_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
- return genpd_stop_dev(genpd, dev);
+ return 0;
}
/**
@@ -869,7 +851,7 @@ static int pm_genpd_thaw_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
- return genpd_start_dev(genpd, dev);
+ return 0;
}
/**
@@ -907,7 +889,7 @@ static int pm_genpd_restore_noirq(struct device *dev)
pm_genpd_sync_poweron(genpd, true);
- return genpd_start_dev(genpd, dev);
+ return 0;
}
/**
@@ -929,15 +911,15 @@ static void pm_genpd_complete(struct device *dev)
if (IS_ERR(genpd))
return;
+ pm_generic_complete(dev);
+
mutex_lock(&genpd->lock);
genpd->prepared_count--;
+ if (!genpd->prepared_count)
+ genpd_queue_power_off_work(genpd);
mutex_unlock(&genpd->lock);
-
- pm_generic_complete(dev);
- pm_runtime_set_active(dev);
- pm_runtime_enable(dev);
}
/**