Multiple platforms need to set CPU to a particular frequency before suspending system. And so they need a common infrastructure which is provided by this patch. Those platforms just need to initialize their ->suspend() pointers with the generic routine.
Tested-by: Stephen Warren swarren@nvidia.com Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/cpufreq/cpufreq.c | 26 ++++++++++++++++++++++++++ include/linux/cpufreq.h | 3 +++ 2 files changed, 29 insertions(+)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 87a4b96..c13c100 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1579,6 +1579,32 @@ 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 * diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 94ed907..325bab0 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -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) {}