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path: root/drivers/base/power/runtime.c
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Diffstat (limited to 'drivers/base/power/runtime.c')
-rw-r--r--drivers/base/power/runtime.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index f8b044e8aef..626dd147b75 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1011,6 +1011,50 @@ void pm_runtime_enable(struct device *dev)
EXPORT_SYMBOL_GPL(pm_runtime_enable);
/**
+ * pm_runtime_forbid - Block run-time PM of a device.
+ * @dev: Device to handle.
+ *
+ * Increase the device's usage count and clear its power.runtime_auto flag,
+ * so that it cannot be suspended at run time until pm_runtime_allow() is called
+ * for it.
+ */
+void pm_runtime_forbid(struct device *dev)
+{
+ spin_lock_irq(&dev->power.lock);
+ if (!dev->power.runtime_auto)
+ goto out;
+
+ dev->power.runtime_auto = false;
+ atomic_inc(&dev->power.usage_count);
+ __pm_runtime_resume(dev, false);
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_forbid);
+
+/**
+ * pm_runtime_allow - Unblock run-time PM of a device.
+ * @dev: Device to handle.
+ *
+ * Decrease the device's usage count and set its power.runtime_auto flag.
+ */
+void pm_runtime_allow(struct device *dev)
+{
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.runtime_auto)
+ goto out;
+
+ dev->power.runtime_auto = true;
+ if (atomic_dec_and_test(&dev->power.usage_count))
+ __pm_runtime_idle(dev);
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_allow);
+
+/**
* pm_runtime_init - Initialize run-time PM fields in given device object.
* @dev: Device object to initialize.
*/
@@ -1028,6 +1072,7 @@ void pm_runtime_init(struct device *dev)
atomic_set(&dev->power.child_count, 0);
pm_suspend_ignore_children(dev, false);
+ dev->power.runtime_auto = true;
dev->power.request_pending = false;
dev->power.request = RPM_REQ_NONE;