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Commit e28867ea authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki
Browse files

cpufreq: Implement cpufreq_generic_suspend() 



Multiple platforms need to set CPUs to a particular frequency before
suspending the system, so provide a common infrastructure for them.

Those platforms only need to point their ->suspend callback pointers
to the generic routine.

Tested-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
[rjw: Changelog]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 2f0aea93

drivers/cpufreq/cpufreq.c

+26 −0
Original line number Diff line number Diff line
@@ -1567,6 +1567,32 @@ static struct subsys_interface cpufreq_interface = { 
	.remove_dev	= cpufreq_remove_dev,

};



/*

 * In case platform wants some specific frequency to be configured

 * during suspend..

 */

int cpufreq_generic_suspend(struct cpufreq_policy *policy)

{

	int ret;



	if (!policy->suspend_freq) {

		pr_err("%s: suspend_freq can't be zero\n", __func__);

		return -EINVAL;

	}



	pr_debug("%s: Setting suspend-freq: %u\n", __func__,

			policy->suspend_freq);



	ret = __cpufreq_driver_target(policy, policy->suspend_freq,

			CPUFREQ_RELATION_H);

	if (ret)

		pr_err("%s: unable to set suspend-freq: %u. err: %d\n",

				__func__, policy->suspend_freq, ret);



	return ret;

}

EXPORT_SYMBOL(cpufreq_generic_suspend);



/**

 * cpufreq_suspend() - Suspend CPUFreq governors

 *

include/linux/cpufreq.h

+3 −0
Original line number Diff line number Diff line
@@ -74,6 +74,8 @@ struct cpufreq_policy { 
	unsigned int		max;    /* in kHz */

	unsigned int		cur;    /* in kHz, only needed if cpufreq

					 * governors are used */

	unsigned int		suspend_freq; /* freq to set during suspend */



	unsigned int		policy; /* see above */

	struct cpufreq_governor	*governor; /* see below */

	void			*governor_data;
@@ -299,6 +301,7 @@ cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) 
#ifdef CONFIG_CPU_FREQ

void cpufreq_suspend(void);

void cpufreq_resume(void);

int cpufreq_generic_suspend(struct cpufreq_policy *policy);

#else

static inline void cpufreq_suspend(void) {}

static inline void cpufreq_resume(void) {}