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

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;