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cpufreq: preserve freq_table_sorted across suspend/hibernate 

During S3/S4 suspend and resume, cpufreq policies are not freed or
recreated; the freq_table and policy structure remain intact. However,
set_freq_table_sorted() currently resets policy->freq_table_sorted to
UNSORTED unconditionally, which is unnecessary since the table order
does not change across suspend/resume.

This patch adds a check to skip validation if policy->freq_table_sorted
is already ASCENDING or DESCENDING. This avoids unnecessary traversal
of the frequency table on S3/S4 resume or repeated online events,
reducing overhead while preserving correctness.

Signed-off-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
Link: https://patch.msgid.link/20251011072420.11495-1-zhangzihuan@kylinos.cn
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zihuan Zhang 2025-10-11 15:24:20 +08:00 committed by Rafael J. Wysocki
parent 673e75ea55
commit 6db0f533d3
1 changed files with 6 additions and 3 deletions
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9
drivers/cpufreq/cpufreq.c
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@ -1421,9 +1421,12 @@ static int cpufreq_policy_online(struct cpufreq_policy *policy,
* If there is a problem with its frequency table, take it
* offline and drop it.
*/
ret = cpufreq_table_validate_and_sort(policy);
if (ret)
goto out_offline_policy;
if (policy->freq_table_sorted != CPUFREQ_TABLE_SORTED_ASCENDING &&
policy->freq_table_sorted != CPUFREQ_TABLE_SORTED_DESCENDING) {
ret = cpufreq_table_validate_and_sort(policy);
if (ret)
goto out_offline_policy;
}
/* related_cpus should at least include policy->cpus. */
cpumask_copy(policy->related_cpus, policy->cpus);