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Commit 21743447 authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki
Browse files

PM / OPP: Introduce dev_pm_opp_get_max_transition_latency() 



In few use cases (like: cpufreq), it is desired to get the maximum
latency for changing OPPs. Add support for that.

Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 655c9df9

drivers/base/power/opp/core.c

+17 −0
Original line number Diff line number Diff line
@@ -289,6 +289,23 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) 
}

EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);



/**

 * dev_pm_opp_get_max_transition_latency() - Get max transition latency in

 *					     nanoseconds

 * @dev: device for which we do this operation

 *

 * Return: This function returns the max transition latency, in nanoseconds, to

 * switch from one OPP to other.

 *

 * Locking: This function takes rcu_read_lock().

 */

unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)

{

	return dev_pm_opp_get_max_volt_latency(dev) +

		dev_pm_opp_get_max_clock_latency(dev);

}

EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);



/**

 * dev_pm_opp_get_suspend_opp() - Get suspend opp

 * @dev:	device for which we do this operation

include/linux/pm_opp.h

+6 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 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);

unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);

unsigned long dev_pm_opp_get_max_transition_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,
@@ -94,6 +95,11 @@ static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) 
	return 0;

}



static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)

{

	return 0;

}



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

{

	return NULL;