PM / Domains: Remove redundant wrapper functions for system PM

Due to the previous changes in genpd, which removed the suspend_power_off
flag, several of the system PM callbacks no longer do any additional
checks but only invoke corresponding pm_generic_* helper functions.

To clean up the code, drop these wrapper functions as they have
become redundant. Instead, assign the system PM callbacks directly
to the pm_generic_*() helper functions.

While changing this, it has bocame clear that some of the current
system PM callbacks in genpd invoke wrong driver callbacks. For
example, the genpd's ->restore() callback invokes pm_generic_resume(),
while that should be pm_generic_restore(). Fix that as well.

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>

drivers/base/power/domain.c

@@ -767,48 +767,6 @@ static int pm_genpd_prepare(struct device *dev)
 	return ret;
 }
 
-/**
- * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
- * @dev: Device to suspend.
- *
- * Suspend a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a PM domain consisting of I/O devices.
- */
-static int pm_genpd_suspend(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_suspend(dev);
-}
-
-/**
- * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
- * @dev: Device to suspend.
- *
- * Carry out a late suspend of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a PM domain consisting of I/O devices.
- */
-static int pm_genpd_suspend_late(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_suspend_late(dev);
-}
-
 /**
  * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
  * @dev: Device to suspend.
@@ -872,92 +830,6 @@ static int pm_genpd_resume_noirq(struct device *dev)
 	return genpd_start_dev(genpd, dev);
 }
 
-/**
- * pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
- * @dev: Device to resume.
- *
- * Carry out an early resume of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a power domain consisting of I/O
- * devices.
- */
-static int pm_genpd_resume_early(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_resume_early(dev);
-}
-
-/**
- * pm_genpd_resume - Resume of device in an I/O PM domain.
- * @dev: Device to resume.
- *
- * Resume a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a power domain consisting of I/O devices.
- */
-static int pm_genpd_resume(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_resume(dev);
-}
-
-/**
- * pm_genpd_freeze - Freezing a device in an I/O PM domain.
- * @dev: Device to freeze.
- *
- * Freeze a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a power domain consisting of I/O devices.
- */
-static int pm_genpd_freeze(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_freeze(dev);
-}
-
-/**
- * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
- * @dev: Device to freeze.
- *
- * Carry out a late freeze of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a power domain consisting of I/O
- * devices.
- */
-static int pm_genpd_freeze_late(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_freeze_late(dev);
-}
-
 /**
  * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
  * @dev: Device to freeze.
@@ -1000,49 +872,6 @@ static int pm_genpd_thaw_noirq(struct device *dev)
 	return genpd_start_dev(genpd, dev);
 }
 
-/**
- * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
- * @dev: Device to thaw.
- *
- * Carry out an early thaw of a device under the assumption that its
- * pm_domain field points to the domain member of an object of type
- * struct generic_pm_domain representing a power domain consisting of I/O
- * devices.
- */
-static int pm_genpd_thaw_early(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_thaw_early(dev);
-}
-
-/**
- * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
- * @dev: Device to thaw.
- *
- * Thaw a device under the assumption that its pm_domain field points to the
- * domain member of an object of type struct generic_pm_domain representing
- * a power domain consisting of I/O devices.
- */
-static int pm_genpd_thaw(struct device *dev)
-{
-	struct generic_pm_domain *genpd;
-
-	dev_dbg(dev, "%s()\n", __func__);
-
-	genpd = dev_to_genpd(dev);
-	if (IS_ERR(genpd))
-		return -EINVAL;
-
-	return pm_generic_thaw(dev);
-}
-
 /**
  * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
  * @dev: Device to resume.
@@ -1151,18 +980,10 @@ EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
 #else /* !CONFIG_PM_SLEEP */
 
 #define pm_genpd_prepare		NULL
-#define pm_genpd_suspend		NULL
-#define pm_genpd_suspend_late		NULL
 #define pm_genpd_suspend_noirq		NULL
-#define pm_genpd_resume_early		NULL
 #define pm_genpd_resume_noirq		NULL
-#define pm_genpd_resume			NULL
-#define pm_genpd_freeze			NULL
-#define pm_genpd_freeze_late		NULL
 #define pm_genpd_freeze_noirq		NULL
-#define pm_genpd_thaw_early		NULL
 #define pm_genpd_thaw_noirq		NULL
-#define pm_genpd_thaw			NULL
 #define pm_genpd_restore_noirq		NULL
 #define pm_genpd_complete		NULL
 
@@ -1454,24 +1275,24 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
 	genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
 	genpd->domain.ops.runtime_resume = genpd_runtime_resume;
 	genpd->domain.ops.prepare = pm_genpd_prepare;
-	genpd->domain.ops.suspend = pm_genpd_suspend;
-	genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
+	genpd->domain.ops.suspend = pm_generic_suspend;
+	genpd->domain.ops.suspend_late = pm_generic_suspend_late;
 	genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
 	genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
-	genpd->domain.ops.resume_early = pm_genpd_resume_early;
-	genpd->domain.ops.resume = pm_genpd_resume;
-	genpd->domain.ops.freeze = pm_genpd_freeze;
-	genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
+	genpd->domain.ops.resume_early = pm_generic_resume_early;
+	genpd->domain.ops.resume = pm_generic_resume;
+	genpd->domain.ops.freeze = pm_generic_freeze;
+	genpd->domain.ops.freeze_late = pm_generic_freeze_late;
 	genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
 	genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
-	genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
-	genpd->domain.ops.thaw = pm_genpd_thaw;
-	genpd->domain.ops.poweroff = pm_genpd_suspend;
-	genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
+	genpd->domain.ops.thaw_early = pm_generic_thaw_early;
+	genpd->domain.ops.thaw = pm_generic_thaw;
+	genpd->domain.ops.poweroff = pm_generic_poweroff;
+	genpd->domain.ops.poweroff_late = pm_generic_poweroff_late;
 	genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
 	genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
-	genpd->domain.ops.restore_early = pm_genpd_resume_early;
-	genpd->domain.ops.restore = pm_genpd_resume;
+	genpd->domain.ops.restore_early = pm_generic_restore_early;
+	genpd->domain.ops.restore = pm_generic_restore;
 	genpd->domain.ops.complete = pm_genpd_complete;
 
 	if (genpd->flags & GENPD_FLAG_PM_CLK) {