2 files changed, 17 insertions, 0 deletions

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 457be03b744d..a453090c9449 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -88,6 +88,21 @@ static void __update_runtime_status(struct device *dev, enum rpm_status status)
         dev->power.runtime_status = status;
 }
 
+u64 pm_runtime_suspended_time(struct device *dev)
+{
+        unsigned long flags, time;
+
+        spin_lock_irqsave(&dev->power.lock, flags);
+
+        update_pm_runtime_accounting(dev);
+        time = dev->power.suspended_jiffies;
+
+        spin_unlock_irqrestore(&dev->power.lock, flags);
+
+        return jiffies_to_nsecs(time);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_suspended_time);
+
 /**
  * pm_runtime_deactivate_timer - Deactivate given device's suspend timer.
  * @dev: Device to handle.
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 54af4eef169f..a370006921c0 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -113,6 +113,8 @@ static inline bool pm_runtime_is_irq_safe(struct device *dev)
         return dev->power.irq_safe;
 }
 
+extern u64 pm_runtime_suspended_time(struct device *dev);
+
 #else /* !CONFIG_PM */
 
 static inline bool queue_pm_work(struct work_struct *work) { return false; }