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Commit 715402a1 authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz Committed by Alex Shi
Browse files

PM / OPP: add dev_pm_opp_get_suspend_opp() helper 



Add dev_pm_opp_get_suspend_opp() helper to obtain suspend opp.

Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 4eafbd15b6c84cd3f6c76022c8a6c27f7cc076e1)
Signed-off-by: default avatarAlex Shi <alex.shi@linaro.org>
parent 32f33eff

drivers/base/power/opp.c

+30 −0
Original line number Diff line number Diff line
@@ -340,6 +340,36 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) 
}

EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);



/**

 * dev_pm_opp_get_suspend_opp() - Get suspend opp

 * @dev:	device for which we do this operation

 *

 * Return: This function returns pointer to the suspend opp if it is

 * defined, otherwise it returns NULL.

 *

 * Locking: This function must be called under rcu_read_lock(). opp is a rcu

 * protected pointer. The reason for the same is that the opp pointer which is

 * returned will remain valid for use with opp_get_{voltage, freq} only while

 * under the locked area. The pointer returned must be used prior to unlocking

 * with rcu_read_unlock() to maintain the integrity of the pointer.

 */

struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)

{

	struct device_opp *dev_opp;

	struct dev_pm_opp *opp;



	opp_rcu_lockdep_assert();



	dev_opp = _find_device_opp(dev);

	if (IS_ERR(dev_opp))

		opp = NULL;

	else

		opp = dev_opp->suspend_opp;



	return opp;

}

EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp);



/**

 * dev_pm_opp_get_opp_count() - Get number of opps available in the opp list

 * @dev:	device for which we do this operation

include/linux/pm_opp.h

+6 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp); 


int dev_pm_opp_get_opp_count(struct device *dev);

unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);

struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);



struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,

					      unsigned long freq,
@@ -80,6 +81,11 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) 
	return 0;

}



static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)

{

	return NULL;

}



static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,

					unsigned long freq, bool available)

{