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| author | Jinzhou Su <Jinzhou.Su@amd.com> | 2022-06-23 05:15:09 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-06-23 21:19:52 +0200 |
| commit | b376471fb47d4905e72fe73e9eeed228f8f2f230 (patch) | |
| tree | 1355a1ee0465d58d019094e3689752e2a1cb0206 | |
| parent | Linux 5.19-rc3 (diff) | |
| download | linux-b376471fb47d4905e72fe73e9eeed228f8f2f230.tar.xz linux-b376471fb47d4905e72fe73e9eeed228f8f2f230.zip | |
cpufreq: amd-pstate: Add resume and suspend callbacks
When system resumes from S3, the CPPC enable register will be
cleared and reset to 0.
So enable the CPPC interface by writing 1 to this register on
system resume and disable it during system suspend.
Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com>
Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
[ rjw: Subject and changelog edits ]
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 7be38bc6a673..9ac75c1cde9c 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -566,6 +566,28 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy) return 0; } +static int amd_pstate_cpu_resume(struct cpufreq_policy *policy) +{ + int ret; + + ret = amd_pstate_enable(true); + if (ret) + pr_err("failed to enable amd-pstate during resume, return %d\n", ret); + + return ret; +} + +static int amd_pstate_cpu_suspend(struct cpufreq_policy *policy) +{ + int ret; + + ret = amd_pstate_enable(false); + if (ret) + pr_err("failed to disable amd-pstate during suspend, return %d\n", ret); + + return ret; +} + /* Sysfs attributes */ /* @@ -636,6 +658,8 @@ static struct cpufreq_driver amd_pstate_driver = { .target = amd_pstate_target, .init = amd_pstate_cpu_init, .exit = amd_pstate_cpu_exit, + .suspend = amd_pstate_cpu_suspend, + .resume = amd_pstate_cpu_resume, .set_boost = amd_pstate_set_boost, .name = "amd-pstate", .attr = amd_pstate_attr, |