PM: runtime: Simplify pm_runtime_get_if_active() usage

[ Upstream commit c0ef3df ]

There are two ways to opportunistically increment a device's runtime PM
usage count, calling either pm_runtime_get_if_active() or
pm_runtime_get_if_in_use(). The former has an argument to tell whether to
ignore the usage count or not, and the latter simply calls the former with
ign_usage_count set to false. The other users that want to ignore the
usage_count will have to explicitly set that argument to true which is a
bit cumbersome.

To make this function more practical to use, remove the ign_usage_count
argument from the function. The main implementation is in a static
function called pm_runtime_get_conditional() and implementations of
pm_runtime_get_if_active() and pm_runtime_get_if_in_use() are moved to
runtime.c.

Signed-off-by: Sakari Ailus <[email protected]>
Reviewed-by: Alex Elder <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Acked-by: Takashi Iwai <[email protected]> # sound/
Reviewed-by: Jacek Lawrynowicz <[email protected]> # drivers/accel/ivpu/
Acked-by: Rodrigo Vivi <[email protected]> # drivers/gpu/drm/i915/
Reviewed-by: Rodrigo Vivi <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]> # drivers/pci/
Signed-off-by: Rafael J. Wysocki <[email protected]>
[ Removed changes to code that didn't exist in older trees ]
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit ac2e62cab0977960420a0f4b3197932591a104f8)

Author: Sakari Ailus

Documentation/power/runtime_pm.rst

@@ -398,10 +398,9 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
       nonzero, increment the counter and return 1; otherwise return 0 without
       changing the counter
 
-  `int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count);`
+  `int pm_runtime_get_if_active(struct device *dev);`
     - return -EINVAL if 'power.disable_depth' is nonzero; otherwise, if the
-      runtime PM status is RPM_ACTIVE, and either ign_usage_count is true
-      or the device's usage_count is non-zero, increment the counter and
+      runtime PM status is RPM_ACTIVE, increment the counter and
       return 1; otherwise return 0 without changing the counter
 
   `void pm_runtime_put_noidle(struct device *dev);`

drivers/base/power/runtime.c

@@ -1175,7 +1175,7 @@ int __pm_runtime_resume(struct device *dev, int rpmflags)
 EXPORT_SYMBOL_GPL(__pm_runtime_resume);
 
 /**
- * pm_runtime_get_if_active - Conditionally bump up device usage counter.
+ * pm_runtime_get_conditional - Conditionally bump up device usage counter.
  * @dev: Device to handle.
  * @ign_usage_count: Whether or not to look at the current usage counter value.
  *
@@ -1196,7 +1196,7 @@ EXPORT_SYMBOL_GPL(__pm_runtime_resume);
  * The caller is responsible for decrementing the runtime PM usage counter of
  * @dev after this function has returned a positive value for it.
  */
-int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count)
+static int pm_runtime_get_conditional(struct device *dev, bool ign_usage_count)
 {
 	unsigned long flags;
 	int retval;
@@ -1217,8 +1217,39 @@ int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count)
 
 	return retval;
 }
+
+/**
+ * pm_runtime_get_if_active - Bump up runtime PM usage counter if the device is
+ *			      in active state
+ * @dev: Target device.
+ *
+ * Increment the runtime PM usage counter of @dev if its runtime PM status is
+ * %RPM_ACTIVE, in which case it returns 1. If the device is in a different
+ * state, 0 is returned. -EINVAL is returned if runtime PM is disabled for the
+ * device, in which case also the usage_count will remain unmodified.
+ */
+int pm_runtime_get_if_active(struct device *dev)
+{
+	return pm_runtime_get_conditional(dev, true);
+}
 EXPORT_SYMBOL_GPL(pm_runtime_get_if_active);
 
+/**
+ * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
+ * @dev: Target device.
+ *
+ * Increment the runtime PM usage counter of @dev if its runtime PM status is
+ * %RPM_ACTIVE and its runtime PM usage counter is greater than 0, in which case
+ * it returns 1. If the device is in a different state or its usage_count is 0,
+ * 0 is returned. -EINVAL is returned if runtime PM is disabled for the device,
+ * in which case also the usage_count will remain unmodified.
+ */
+int pm_runtime_get_if_in_use(struct device *dev)
+{
+	return pm_runtime_get_conditional(dev, false);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_get_if_in_use);
+
 /**
  * __pm_runtime_set_status - Set runtime PM status of a device.
  * @dev: Device to handle.

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -434,7 +434,10 @@ static intel_wakeref_t __intel_runtime_pm_get_if_active(struct intel_runtime_pm
 		 * function, since the power state is undefined. This applies
 		 * atm to the late/early system suspend/resume handlers.
 		 */
-		if (pm_runtime_get_if_active(rpm->kdev, ignore_usecount) <= 0)
+		if ((ignore_usecount &&
+		     pm_runtime_get_if_active(rpm->kdev) <= 0) ||
+		    (!ignore_usecount &&
+		     pm_runtime_get_if_in_use(rpm->kdev) <= 0))
 			return 0;
 	}
 

drivers/media/i2c/ccs/ccs-core.c

@@ -665,7 +665,7 @@ static int ccs_set_ctrl(struct v4l2_ctrl *ctrl)
 		break;
 	}
 
-	pm_status = pm_runtime_get_if_active(&client->dev, true);
+	pm_status = pm_runtime_get_if_active(&client->dev);
 	if (!pm_status)
 		return 0;
 

drivers/net/ipa/ipa_smp2p.c

@@ -92,7 +92,7 @@ static void ipa_smp2p_notify(struct ipa_smp2p *smp2p)
 		return;
 
 	dev = &smp2p->ipa->pdev->dev;
-	smp2p->power_on = pm_runtime_get_if_active(dev, true) > 0;
+	smp2p->power_on = pm_runtime_get_if_active(dev) > 0;
 
 	/* Signal whether the IPA power is enabled */
 	mask = BIT(smp2p->enabled_bit);

drivers/pci/pci.c

@@ -2493,7 +2493,7 @@ static void pci_pme_list_scan(struct work_struct *work)
 			 * course of the call.
 			 */
 			if (bdev) {
-				bref = pm_runtime_get_if_active(bdev, true);
+				bref = pm_runtime_get_if_active(bdev);
 				if (!bref)
 					continue;
 

drivers/ufs/core/ufshcd-priv.h

@@ -326,7 +326,7 @@ static inline int ufshcd_rpm_get_sync(struct ufs_hba *hba)
 
 static inline int ufshcd_rpm_get_if_active(struct ufs_hba *hba)
 {
-	return pm_runtime_get_if_active(&hba->ufs_device_wlun->sdev_gendev, true);
+	return pm_runtime_get_if_active(&hba->ufs_device_wlun->sdev_gendev);
 }
 
 static inline int ufshcd_rpm_put_sync(struct ufs_hba *hba)

include/linux/pm_runtime.h

@@ -73,7 +73,8 @@ extern int pm_runtime_force_resume(struct device *dev);
 extern int __pm_runtime_idle(struct device *dev, int rpmflags);
 extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
 extern int __pm_runtime_resume(struct device *dev, int rpmflags);
-extern int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count);
+extern int pm_runtime_get_if_active(struct device *dev);
+extern int pm_runtime_get_if_in_use(struct device *dev);
 extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
 extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
 extern int pm_runtime_barrier(struct device *dev);
@@ -95,18 +96,6 @@ extern void pm_runtime_release_supplier(struct device_link *link);
 
 extern int devm_pm_runtime_enable(struct device *dev);
 
-/**
- * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
- * @dev: Target device.
- *
- * Increment the runtime PM usage counter of @dev if its runtime PM status is
- * %RPM_ACTIVE and its runtime PM usage counter is greater than 0.
- */
-static inline int pm_runtime_get_if_in_use(struct device *dev)
-{
-	return pm_runtime_get_if_active(dev, false);
-}
-
 /**
  * pm_suspend_ignore_children - Set runtime PM behavior regarding children.
  * @dev: Target device.
@@ -277,8 +266,7 @@ static inline int pm_runtime_get_if_in_use(struct device *dev)
 {
 	return -EINVAL;
 }
-static inline int pm_runtime_get_if_active(struct device *dev,
-					   bool ign_usage_count)
+static inline int pm_runtime_get_if_active(struct device *dev)
 {
 	return -EINVAL;
 }

sound/hda/hdac_device.c

@@ -611,7 +611,7 @@ EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm);
 int snd_hdac_keep_power_up(struct hdac_device *codec)
 {
 	if (!atomic_inc_not_zero(&codec->in_pm)) {
-		int ret = pm_runtime_get_if_active(&codec->dev, true);
+		int ret = pm_runtime_get_if_active(&codec->dev);
 		if (!ret)
 			return -1;
 		if (ret < 0)