diff options
| -rw-r--r-- | drivers/base/power/main.c | 5 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 111 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 8 |
3 files changed, 69 insertions, 55 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 1b41fca3d65a..c9fbb9d5484d 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -29,6 +29,7 @@ #include <linux/async.h> #include <linux/suspend.h> #include <trace/events/power.h> +#include <linux/cpufreq.h> #include <linux/cpuidle.h> #include <linux/timer.h> @@ -789,6 +790,8 @@ void dpm_resume(pm_message_t state) mutex_unlock(&dpm_list_mtx); async_synchronize_full(); dpm_show_time(starttime, state, NULL); + + cpufreq_resume(); } /** @@ -1259,6 +1262,8 @@ int dpm_suspend(pm_message_t state) might_sleep(); + cpufreq_suspend(); + mutex_lock(&dpm_list_mtx); pm_transition = state; async_error = 0; diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 2de2f1ddd95f..289a407a9207 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -26,7 +26,7 @@ #include <linux/module.h> #include <linux/mutex.h> #include <linux/slab.h> -#include <linux/syscore_ops.h> +#include <linux/suspend.h> #include <linux/tick.h> #include <trace/events/power.h> @@ -45,6 +45,9 @@ static LIST_HEAD(cpufreq_policy_list); /* This one keeps track of the previously set governor of a removed CPU */ static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor); +/* Flag to suspend/resume CPUFreq governors */ +static bool cpufreq_suspended; + static inline bool has_target(void) { return cpufreq_driver->target_index || cpufreq_driver->target; @@ -1565,82 +1568,77 @@ static struct subsys_interface cpufreq_interface = { }; /** - * cpufreq_bp_suspend - Prepare the boot CPU for system suspend. + * cpufreq_suspend() - Suspend CPUFreq governors * - * This function is only executed for the boot processor. The other CPUs - * have been put offline by means of CPU hotplug. + * Called during system wide Suspend/Hibernate cycles for suspending governors + * as some platforms can't change frequency after this point in suspend cycle. + * Because some of the devices (like: i2c, regulators, etc) they use for + * changing frequency are suspended quickly after this point. */ -static int cpufreq_bp_suspend(void) +void cpufreq_suspend(void) { - int ret = 0; - - int cpu = smp_processor_id(); struct cpufreq_policy *policy; - pr_debug("suspending cpu %u\n", cpu); + if (!cpufreq_driver) + return; - /* If there's no policy for the boot CPU, we have nothing to do. */ - policy = cpufreq_cpu_get(cpu); - if (!policy) - return 0; + if (!has_target()) + return; - if (cpufreq_driver->suspend) { - ret = cpufreq_driver->suspend(policy); - if (ret) - printk(KERN_ERR "cpufreq: suspend failed in ->suspend " - "step on CPU %u\n", policy->cpu); + pr_debug("%s: Suspending Governors\n", __func__); + + list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { + if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) + pr_err("%s: Failed to stop governor for policy: %p\n", + __func__, policy); + else if (cpufreq_driver->suspend + && cpufreq_driver->suspend(policy)) + pr_err("%s: Failed to suspend driver: %p\n", __func__, + policy); } - cpufreq_cpu_put(policy); - return ret; + cpufreq_suspended = true; } /** - * cpufreq_bp_resume - Restore proper frequency handling of the boot CPU. + * cpufreq_resume() - Resume CPUFreq governors * - * 1.) resume CPUfreq hardware support (cpufreq_driver->resume()) - * 2.) schedule call cpufreq_update_policy() ASAP as interrupts are - * restored. It will verify that the current freq is in sync with - * what we believe it to be. This is a bit later than when it - * should be, but nonethteless it's better than calling - * cpufreq_driver->get() here which might re-enable interrupts... - * - * This function is only executed for the boot CPU. The other CPUs have not - * been turned on yet. + * Called during system wide Suspend/Hibernate cycle for resuming governors that + * are suspended with cpufreq_suspend(). */ -static void cpufreq_bp_resume(void) +void cpufreq_resume(void) { - int ret = 0; - - int cpu = smp_processor_id(); struct cpufreq_policy *policy; - pr_debug("resuming cpu %u\n", cpu); + if (!cpufreq_driver) + return; - /* If there's no policy for the boot CPU, we have nothing to do. */ - policy = cpufreq_cpu_get(cpu); - if (!policy) + if (!has_target()) return; - if (cpufreq_driver->resume) { - ret = cpufreq_driver->resume(policy); - if (ret) { - printk(KERN_ERR "cpufreq: resume failed in ->resume " - "step on CPU %u\n", policy->cpu); - goto fail; - } - } + pr_debug("%s: Resuming Governors\n", __func__); - schedule_work(&policy->update); + cpufreq_suspended = false; -fail: - cpufreq_cpu_put(policy); -} + list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { + if (__cpufreq_governor(policy, CPUFREQ_GOV_START) + || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) + pr_err("%s: Failed to start governor for policy: %p\n", + __func__, policy); + else if (cpufreq_driver->resume + && cpufreq_driver->resume(policy)) + pr_err("%s: Failed to resume driver: %p\n", __func__, + policy); -static struct syscore_ops cpufreq_syscore_ops = { - .suspend = cpufreq_bp_suspend, - .resume = cpufreq_bp_resume, -}; + /* + * schedule call cpufreq_update_policy() for boot CPU, i.e. last + * policy in list. It will verify that the current freq is in + * sync with what we believe it to be. + */ + if (list_is_last(&policy->policy_list, &cpufreq_policy_list)) + schedule_work(&policy->update); + } +} /** * cpufreq_get_current_driver - return current driver's name @@ -1857,6 +1855,10 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, struct cpufreq_governor *gov = NULL; #endif + /* Don't start any governor operations if we are entering suspend */ + if (cpufreq_suspended) + return 0; + if (policy->governor->max_transition_latency && policy->cpuinfo.transition_latency > policy->governor->max_transition_latency) { @@ -2392,7 +2394,6 @@ static int __init cpufreq_core_init(void) cpufreq_global_kobject = kobject_create(); BUG_ON(!cpufreq_global_kobject); - register_syscore_ops(&cpufreq_syscore_ops); return 0; } diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 4d89e0e6f9cc..94ed907c6999 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -296,6 +296,14 @@ cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) policy->cpuinfo.max_freq); } +#ifdef CONFIG_CPU_FREQ +void cpufreq_suspend(void); +void cpufreq_resume(void); +#else +static inline void cpufreq_suspend(void) {} +static inline void cpufreq_resume(void) {} +#endif + /********************************************************************* * CPUFREQ NOTIFIER INTERFACE * *********************************************************************/ |
