On Thu, 20 Dec 2018 at 15:16, Vincent Guittot
<vincent.guittot@xxxxxxxxxx> wrote:
>
> Some drivers (like i915/drm) needs to get the accounted suspended time.
> pm_runtime_suspended_time() will return the suspended accounted time
> in ns unit.
>
> Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Kind regards
Uffe
> ---
> drivers/base/power/runtime.c | 16 ++++++++++++++++
> include/linux/pm_runtime.h | 2 ++
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> index beb85c3..e695544 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -86,6 +86,22 @@ 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 f0fc470..d479707 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; }
> --
> 2.7.4
>
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