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cpufreq: use last policy after online for drivers with ->setpolicy

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For cpufreq drivers which use setpolicy interface, after offline->online
the policy is set to default. This can be reproduced by setting the
default policy of intel_pstate or longrun to ondemand and then change to
"performance". After offline and online, the setpolicy will be called with
the policy=ondemand.

For drivers using governors this condition is handled by storing
last_governor, during offline and restoring during online. The same should
be done for drivers using setpolicy interface. Storing last_policy during
offline and restoring during online.

Signed-off-by: Srinivas Pandruvada <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Srinivas Pandruvada 2015-12-01 16:52:14 -08:00 • committed by Rafael J. Wysocki
commit 69030dd1c3
2 changed files with 11 additions and 4 deletions
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14
drivers/cpufreq/cpufreq.c
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@ -976,10 +976,14 @@ static int cpufreq_init_policy(struct cpufreq_policy *policy)
new_policy.governor = gov;
/* Use the default policy if its valid. */
if (cpufreq_driver->setpolicy)
cpufreq_parse_governor(gov->name, &new_policy.policy, NULL);
/* Use the default policy if there is no last_policy. */
if (cpufreq_driver->setpolicy) {
if (policy->last_policy)
new_policy.policy = policy->last_policy;
else
cpufreq_parse_governor(gov->name, &new_policy.policy,
NULL);
}
/* set default policy */
return cpufreq_set_policy(policy, &new_policy);
}
@ -1330,6 +1334,8 @@ static void cpufreq_offline_prepare(unsigned int cpu)
if (has_target())
strncpy(policy->last_governor, policy->governor->name,
CPUFREQ_NAME_LEN);
else
policy->last_policy = policy->policy;
} else if (cpu == policy->cpu) {
/* Nominate new CPU */
policy->cpu = cpumask_any(policy->cpus);