On Thu, Jun 23, 2022 at 11:15:09AM +0800, Jinzhou Su wrote:
> When system resumes from S3, the CPPC enable register will be
> cleared and reset to 0. So sets this bit to enable CPPC
> interface by writing 1 to this register.
>
> Signed-off-by: Jinzhou Su <Jinzhou.Su@xxxxxxx>
> ---
> drivers/cpufreq/amd-pstate.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> 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,
> --
> 2.32.0
>
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.
</formletter>
