Commit 0a300767 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

cpufreq: Introduce cpufreq_start_governor()



Starting a governor in cpufreq always follows the same pattern
involving two calls to cpufreq_governor(), one with the event
argument set to CPUFREQ_GOV_START and one with that argument set to
CPUFREQ_GOV_LIMITS.

Introduce cpufreq_start_governor() that will carry out those two
operations and make all places where governors are started use it.

That slightly modifies the behavior of cpufreq_set_policy() which
now also will go back to the old governor if the second call to
cpufreq_governor() (the one with event equal to CPUFREQ_GOV_LIMITS)
fails, but that really is how it should work in the first place.

Also cpufreq_resume() will now pring an error message if the
CPUFREQ_GOV_LIMITS call to cpufreq_governor() fails, but that
makes it follow cpufreq_add_policy_cpu() and cpufreq_offline()
in that respect.
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent 1b028984
......@@ -76,6 +76,7 @@ static inline bool has_target(void)
/* internal prototypes */
static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
static int cpufreq_start_governor(struct cpufreq_policy *policy);
/**
* Two notifier lists: the "policy" list is involved in the
......@@ -964,10 +965,7 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cp
cpumask_set_cpu(cpu, policy->cpus);
if (has_target()) {
ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
if (!ret)
ret = cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
ret = cpufreq_start_governor(policy);
if (ret)
pr_err("%s: Failed to start governor\n", __func__);
}
......@@ -1308,10 +1306,7 @@ static void cpufreq_offline(unsigned int cpu)
/* Start governor again for active policy */
if (!policy_is_inactive(policy)) {
if (has_target()) {
ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
if (!ret)
ret = cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
ret = cpufreq_start_governor(policy);
if (ret)
pr_err("%s: Failed to start governor\n", __func__);
}
......@@ -1591,9 +1586,7 @@ void cpufreq_resume(void)
policy);
} else {
down_write(&policy->rwsem);
ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
if (!ret)
cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
ret = cpufreq_start_governor(policy);
up_write(&policy->rwsem);
if (ret)
......@@ -1935,6 +1928,14 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
return ret;
}
static int cpufreq_start_governor(struct cpufreq_policy *policy)
{
int ret;
ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
return ret ? ret : cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
}
int cpufreq_register_governor(struct cpufreq_governor *governor)
{
int err;
......@@ -2071,8 +2072,10 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
return cpufreq_driver->setpolicy(new_policy);
}
if (new_policy->governor == policy->governor)
goto out;
if (new_policy->governor == policy->governor) {
pr_debug("cpufreq: governor limits update\n");
return cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
}
pr_debug("governor switch\n");
......@@ -2100,10 +2103,11 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
policy->governor = new_policy->governor;
ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT);
if (!ret) {
ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
if (!ret)
goto out;
ret = cpufreq_start_governor(policy);
if (!ret) {
pr_debug("cpufreq: governor change\n");
return 0;
}
cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
}
......@@ -2114,14 +2118,10 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
if (cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT))
policy->governor = NULL;
else
cpufreq_governor(policy, CPUFREQ_GOV_START);
cpufreq_start_governor(policy);
}
return ret;
out:
pr_debug("governor: change or update limits\n");
return cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
}
/**
......
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