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cpufreq: interactive: take idle notifications only when active

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Register an idle notifier only when the governor is active.  Also
short-circuit work of idle end if the governor is not enabled.

Signed-off-by: Sam Leffler <sleffler@chromium.org>
Change-Id: I4cae36dd2e7389540d337d74745ffbaa0131870f
This commit is contained in:
Sam Leffler
2012-06-27 10:12:04 -07:00
committed by John Stultz
parent f0b83a6710
commit 5722666d2d
1 changed files with 25 additions and 21 deletions
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46
drivers/cpufreq/cpufreq_interactive.c
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@@ -364,6 +364,9 @@ static void cpufreq_interactive_idle_end(void)
struct cpufreq_interactive_cpuinfo *pcpu =
&per_cpu(cpuinfo, smp_processor_id());
if (!pcpu->governor_enabled)
return;
pcpu->idling = 0;
smp_wmb();
@@ -816,6 +819,26 @@ static struct attribute_group interactive_attr_group = {
.name = "interactive",
};
static int cpufreq_interactive_idle_notifier(struct notifier_block *nb,
unsigned long val,
void *data)
{
switch (val) {
case IDLE_START:
cpufreq_interactive_idle_start();
break;
case IDLE_END:
cpufreq_interactive_idle_end();
break;
}
return 0;
}
static struct notifier_block cpufreq_interactive_idle_nb = {
.notifier_call = cpufreq_interactive_idle_notifier,
};
static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
unsigned int event)
{
@@ -869,6 +892,7 @@ static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
pr_warn("%s: failed to register input handler\n",
__func__);
idle_notifier_register(&cpufreq_interactive_idle_nb);
break;
case CPUFREQ_GOV_STOP:
@@ -891,6 +915,7 @@ static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
if (atomic_dec_return(&active_count) > 0)
return 0;
idle_notifier_unregister(&cpufreq_interactive_idle_nb);
input_unregister_handler(&cpufreq_interactive_input_handler);
sysfs_remove_group(cpufreq_global_kobject,
&interactive_attr_group);
@@ -909,26 +934,6 @@ static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
return 0;
}
static int cpufreq_interactive_idle_notifier(struct notifier_block *nb,
unsigned long val,
void *data)
{
switch (val) {
case IDLE_START:
cpufreq_interactive_idle_start();
break;
case IDLE_END:
cpufreq_interactive_idle_end();
break;
}
return 0;
}
static struct notifier_block cpufreq_interactive_idle_nb = {
.notifier_call = cpufreq_interactive_idle_notifier,
};
static int __init cpufreq_interactive_init(void)
{
unsigned int i;
@@ -970,7 +975,6 @@ static int __init cpufreq_interactive_init(void)
spin_lock_init(&down_cpumask_lock);
mutex_init(&set_speed_lock);
idle_notifier_register(&cpufreq_interactive_idle_nb);
INIT_WORK(&inputopen.inputopen_work, cpufreq_interactive_input_open);
return cpufreq_register_governor(&cpufreq_gov_interactive);