On 25 April 2014 00:39, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Add a new helper routine, pm_runtime_enabled_and_suspended(), to
> allow subsystems (or PM domains) to check the runtime PM status of
> devices during system suspend (possibly to avoid resuming those
> devices upfront at that time).
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
> drivers/base/power/runtime.c | 28 ++++++++++++++++++++++++++++
> include/linux/pm_runtime.h | 2 ++
> 2 files changed, 30 insertions(+)
>
> Index: linux-pm/include/linux/pm_runtime.h
> ===================================================================
> --- linux-pm.orig/include/linux/pm_runtime.h
> +++ linux-pm/include/linux/pm_runtime.h
> @@ -57,6 +57,7 @@ extern unsigned long pm_runtime_autosusp
> extern void pm_runtime_update_max_time_suspended(struct device *dev,
> s64 delta_ns);
> extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
> +extern bool pm_runtime_enabled_and_suspended(struct device *dev);
>
> static inline bool pm_children_suspended(struct device *dev)
> {
> @@ -165,6 +166,7 @@ static inline unsigned long pm_runtime_a
> struct device *dev) { return 0; }
> static inline void pm_runtime_set_memalloc_noio(struct device *dev,
> bool enable){}
> +static inline bool pm_runtime_enabled_and_suspended(struct device *dev) { return false; }
>
> #endif /* !CONFIG_PM_RUNTIME */
>
> Index: linux-pm/drivers/base/power/runtime.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/runtime.c
> +++ linux-pm/drivers/base/power/runtime.c
> @@ -1195,6 +1195,34 @@ void pm_runtime_enable(struct device *de
> EXPORT_SYMBOL_GPL(pm_runtime_enable);
>
> /**
> + * pm_runtime_enabled_and_suspended - Check runtime PM status of a device.
> + * @dev: Device to handle.
> + *
> + * This routine is to be executed during system suspend only, after
> + * device_prepare() has been executed for @dev.
Hi Rafael,
Do we really need to state the above constraints. Could we not leave
it to be used in other scenarios as well? I am not sure those would
exists though, but still. :-)
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Kind regards
Ulf Hansson
> + *
> + * Return false if runtime PM is disabled for the device. Otherwise, wait
> + * for pending transitions to complete and check the runtime PM status of the
> + * device after that. Return true if it is RPM_SUSPENDED.
> + */
> +bool pm_runtime_enabled_and_suspended(struct device *dev)
> +{
> + unsigned long flags;
> + bool ret;
> +
> + spin_lock_irqsave(&dev->power.lock, flags);
> + if (dev->power.disable_depth) {
> + ret = false;
> + } else {
> + __pm_runtime_barrier(dev);
> + ret = pm_runtime_status_suspended(dev);
> + }
> + spin_unlock_irqrestore(&dev->power.lock, flags);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(pm_runtime_enabled_and_suspended);
> +
> +/**
> * pm_runtime_forbid - Block runtime PM of a device.
> * @dev: Device to handle.
> *
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pm" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
