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authorRafael J. Wysocki <rjw@sisk.pl>2012-03-16 21:50:08 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2012-03-16 21:50:08 +0100
commit62dc7c02c31c2cc66c46cc8761d421c60bb07a6f (patch)
tree73068d760963dc8e154a4e54025e41a529c67b83 /drivers/base
parentcf3bbcaf09cb158590d1a9e0c0a6796d4fe92452 (diff)
parent57d13370cfaf6017c68981e66ff5b3bf20a2705c (diff)
downloadlinux-62dc7c02c31c2cc66c46cc8761d421c60bb07a6f.tar.bz2
Merge branch 'pm-domains'
* pm-domains: PM / shmobile: Make MTU2 driver use pm_genpd_dev_always_on() PM / shmobile: Make CMT driver use pm_genpd_dev_always_on() PM / shmobile: Make TMU driver use pm_genpd_dev_always_on() PM / Domains: Introduce "always on" device flag PM / Domains: Fix hibernation restore of devices, v2 PM / Domains: Fix handling of wakeup devices during system resume
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c69
1 files changed, 53 insertions, 16 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index d2c03239abcf..b6ff6ecf519d 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -366,7 +366,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
not_suspended = 0;
list_for_each_entry(pdd, &genpd->dev_list, list_node)
if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
- || pdd->dev->power.irq_safe))
+ || pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on))
not_suspended++;
if (not_suspended > genpd->in_progress)
@@ -503,6 +503,9 @@ static int pm_genpd_runtime_suspend(struct device *dev)
might_sleep_if(!genpd->dev_irq_safe);
+ if (dev_gpd_data(dev)->always_on)
+ return -EBUSY;
+
stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
if (stop_ok && !stop_ok(dev))
return -EBUSY;
@@ -764,8 +767,10 @@ static int pm_genpd_prepare(struct device *dev)
genpd_acquire_lock(genpd);
- if (genpd->prepared_count++ == 0)
+ if (genpd->prepared_count++ == 0) {
+ genpd->suspended_count = 0;
genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
+ }
genpd_release_lock(genpd);
@@ -857,7 +862,7 @@ static int pm_genpd_suspend_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
- if (genpd->suspend_power_off
+ if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
|| (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
return 0;
@@ -890,7 +895,8 @@ static int pm_genpd_resume_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
- if (genpd->suspend_power_off)
+ if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
+ || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
return 0;
/*
@@ -1009,7 +1015,8 @@ static int pm_genpd_freeze_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
- return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev);
+ return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
+ 0 : genpd_stop_dev(genpd, dev);
}
/**
@@ -1029,7 +1036,8 @@ static int pm_genpd_thaw_noirq(struct device *dev)
if (IS_ERR(genpd))
return -EINVAL;
- return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev);
+ return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
+ 0 : genpd_start_dev(genpd, dev);
}
/**
@@ -1096,22 +1104,32 @@ static int pm_genpd_restore_noirq(struct device *dev)
* Since all of the "noirq" callbacks are executed sequentially, it is
* guaranteed that this function will never run twice in parallel for
* the same PM domain, so it is not necessary to use locking here.
+ *
+ * At this point suspended_count == 0 means we are being run for the
+ * first time for the given domain in the present cycle.
*/
- genpd->status = GPD_STATE_POWER_OFF;
- if (genpd->suspend_power_off) {
+ if (genpd->suspended_count++ == 0) {
/*
- * The boot kernel might put the domain into the power on state,
- * so make sure it really is powered off.
+ * The boot kernel might put the domain into arbitrary state,
+ * so make it appear as powered off to pm_genpd_poweron(), so
+ * that it tries to power it on in case it was really off.
*/
- if (genpd->power_off)
- genpd->power_off(genpd);
- return 0;
+ genpd->status = GPD_STATE_POWER_OFF;
+ if (genpd->suspend_power_off) {
+ /*
+ * If the domain was off before the hibernation, make
+ * sure it will be off going forward.
+ */
+ if (genpd->power_off)
+ genpd->power_off(genpd);
+
+ return 0;
+ }
}
pm_genpd_poweron(genpd);
- genpd->suspended_count--;
- return genpd_start_dev(genpd, dev);
+ return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev);
}
/**
@@ -1307,6 +1325,26 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
}
/**
+ * pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device.
+ * @dev: Device to set/unset the flag for.
+ * @val: The new value of the device's "always on" flag.
+ */
+void pm_genpd_dev_always_on(struct device *dev, bool val)
+{
+ struct pm_subsys_data *psd;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ psd = dev_to_psd(dev);
+ if (psd && psd->domain_data)
+ to_gpd_data(psd->domain_data)->always_on = val;
+
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+}
+EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on);
+
+/**
* pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
* @genpd: Master PM domain to add the subdomain to.
* @subdomain: Subdomain to be added.
@@ -1648,7 +1686,6 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
genpd->poweroff_task = NULL;
genpd->resume_count = 0;
genpd->device_count = 0;
- genpd->suspended_count = 0;
genpd->max_off_time_ns = -1;
genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;