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Commit 655c9df9 authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki
Browse files

PM / OPP: Introduce dev_pm_opp_get_max_volt_latency() 



In few use cases (like: cpufreq), it is desired to get the maximum
voltage 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 7d34d56e

drivers/base/power/opp/core.c

+59 −0
Original line number Diff line number Diff line
@@ -230,6 +230,65 @@ 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_max_volt_latency() - Get max voltage latency in nanoseconds

 * @dev: device for which we do this operation

 *

 * Return: This function returns the max voltage latency in nanoseconds.

 *

 * Locking: This function takes rcu_read_lock().

 */

unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)

{

	struct device_opp *dev_opp;

	struct dev_pm_opp *opp;

	struct regulator *reg;

	unsigned long latency_ns = 0;

	unsigned long min_uV = ~0, max_uV = 0;

	int ret;



	rcu_read_lock();



	dev_opp = _find_device_opp(dev);

	if (IS_ERR(dev_opp)) {

		rcu_read_unlock();

		return 0;

	}



	reg = dev_opp->regulator;

	if (IS_ERR_OR_NULL(reg)) {

		/* Regulator may not be required for device */

		if (reg)

			dev_err(dev, "%s: Invalid regulator (%ld)\n", __func__,

				PTR_ERR(reg));

		rcu_read_unlock();

		return 0;

	}



	list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {

		if (!opp->available)

			continue;



		if (opp->u_volt_min < min_uV)

			min_uV = opp->u_volt_min;

		if (opp->u_volt_max > max_uV)

			max_uV = opp->u_volt_max;

	}



	rcu_read_unlock();



	/*

	 * The caller needs to ensure that dev_opp (and hence the regulator)

	 * isn't freed, while we are executing this routine.

	 */

	ret = regulator_set_voltage_time(reg, min_uV, max_uV);

	if (ret > 0)

		latency_ns = ret * 1000;



	return latency_ns;

}

EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_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
@@ -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);

unsigned long dev_pm_opp_get_max_volt_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,
@@ -88,6 +89,11 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) 
	return 0;

}



static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)

{

	return 0;

}



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

{

	return NULL;