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cpufreq: Implement cpufreq_generic_suspend()

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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: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2014-03-04 11:00:27 +08:00 committed by Rafael J. Wysocki
parent 2f0aea9363
commit e28867eab7
2 changed files with 29 additions and 0 deletions
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26
drivers/cpufreq/cpufreq.c
View file

@ -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
*

3
include/linux/cpufreq.h
View file

@ -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) {}