| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.18 019/102] cpufreq: amd-pstate: Add resume and suspend callbacks | Date | Tue, 5 Jul 2022 13:57:45 +0200 |
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From: Jinzhou Su <Jinzhou.Su@amd.com>
commit b376471fb47d4905e72fe73e9eeed228f8f2f230 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/cpufreq/amd-pstate.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
--- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -566,6 +566,28 @@ static int amd_pstate_cpu_exit(struct cp 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_ .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,
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