[PATCH v3 2/4] cpufreq: Set default policy->min/max values for all drivers

[Pierre Gondois]

Some drivers set policy->min/max in their .init() callback.
cpufreq_set_policy() will ultimately override them through:
cpufreq_policy_online()
\-cpufreq_init_policy()
  \-cpufreq_set_policy()
    \-/* Set policy->min/max */
Thus the policy min/max values provided are only temporary.

There is an exception if CPUFREQ_NEED_INITIAL_FREQ_CHECK is set and:
cpufreq_policy_online()
\-__cpufreq_driver_target()
  \-cpufreq_driver->target()

To prepare for a following patch that will remove all
policy->min/max initialization in the driver .init() callback
if the min/max value is equal to the cpuinfo.min/max_freq,
set a default policy->min/max value for all drivers.

Signed-off-by: Pierre Gondois <pierre.gondois@xxxxxxx>
Reviewed-by: Jie Zhan <zhanjie9@xxxxxxxxxxxxx>
---
 drivers/cpufreq/cpufreq.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 50616cfebc617..d75c6739aa780 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1474,6 +1474,13 @@ static int cpufreq_policy_online(struct cpufreq_policy *policy,
 				goto out_offline_policy;
 		}
 
+		/*
+		 * If the driver didn't set policy->min/max, set them as
+		 * they are used to clamp frequency requests.
+		 */
+		policy->min = policy->min ? policy->min : policy->cpuinfo.min_freq;
+		policy->max = policy->max ? policy->max : policy->cpuinfo.max_freq;
+
 		/* related_cpus should at least include policy->cpus. */
 		cpumask_copy(policy->related_cpus, policy->cpus);
 	}
-- 
2.43.0