Commit 3fbc5c3b authored by Ulf Hansson's avatar Ulf Hansson Committed by Viresh Kumar
Browse files

PM: domains: Introduce dev_pm_domain_set_performance_state() 



The generic PM domain is currently the only PM domain variant that supports
performance scaling. To allow performance scaling to be supported through a
common interface, let's add an optional callback ->set_performance_state(),
in the struct dev_pm_domain.

Moreover, let's add a function, dev_pm_domain_set_performance_state(), that
may be called by consumers to request a new performance state for a device
through its PM domain.

Note that, in most cases it's preferred that a consumer use the OPP library
to request a new performance state for its device. Although, this requires
some additional changes to be supported, which are being implemented from
subsequent changes.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent 0bb80ecc

drivers/base/power/common.c

+21 −0
Original line number Diff line number Diff line
@@ -228,3 +228,24 @@ void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd) 
	device_pm_check_callbacks(dev);

}

EXPORT_SYMBOL_GPL(dev_pm_domain_set);



/**

 * dev_pm_domain_set_performance_state - Request a new performance state.

 * @dev: The device to make the request for.

 * @state: Target performance state for the device.

 *

 * This function should be called when a new performance state needs to be

 * requested for a device that is attached to a PM domain. Note that, the

 * support for performance scaling for PM domains is optional.

 *

 * Returns 0 on success and when performance scaling isn't supported, negative

 * error code on failure.

 */

int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state)

{

	if (dev->pm_domain && dev->pm_domain->set_performance_state)

		return dev->pm_domain->set_performance_state(dev, state);



	return 0;

}

EXPORT_SYMBOL_GPL(dev_pm_domain_set_performance_state);

include/linux/pm.h

+2 −0
Original line number Diff line number Diff line
@@ -719,6 +719,7 @@ extern void dev_pm_put_subsys_data(struct device *dev); 
 * @activate: Called before executing probe routines for bus types and drivers.

 * @sync: Called after successful driver probe.

 * @dismiss: Called after unsuccessful driver probe and after driver removal.

 * @set_performance_state: Called to request a new performance state.

 *

 * Power domains provide callbacks that are executed during system suspend,

 * hibernation, system resume and during runtime PM transitions instead of
@@ -731,6 +732,7 @@ struct dev_pm_domain { 
	int (*activate)(struct device *dev);

	void (*sync)(struct device *dev);

	void (*dismiss)(struct device *dev);

	int (*set_performance_state)(struct device *dev, unsigned int state);

};



/*

include/linux/pm_domain.h

+6 −0
Original line number Diff line number Diff line
@@ -430,6 +430,7 @@ struct device *dev_pm_domain_attach_by_name(struct device *dev, 
void dev_pm_domain_detach(struct device *dev, bool power_off);

int dev_pm_domain_start(struct device *dev);

void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);

int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);

#else

static inline int dev_pm_domain_attach(struct device *dev, bool power_on)

{
@@ -452,6 +453,11 @@ static inline int dev_pm_domain_start(struct device *dev) 
}

static inline void dev_pm_domain_set(struct device *dev,

				     struct dev_pm_domain *pd) {}

static inline int dev_pm_domain_set_performance_state(struct device *dev,

						      unsigned int state)

{

	return 0;

}

#endif



#endif /* _LINUX_PM_DOMAIN_H */