linux-kernel - Re: [PATCH v2 1/1] acpi-cpufreq: Honor _PSD table setting in CPU frequency control

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Date:   Mon, 19 Oct 2020 17:29:45 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Wei Huang <wei.huang2@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH v2 1/1] acpi-cpufreq: Honor _PSD table setting in CPU
 frequency control

On Mon, Oct 19, 2020 at 5:57 AM Wei Huang <wei.huang2@....com> wrote:
>
> acpi-cpufreq has a old quirk that overrides the _PSD table supplied by
> BIOS on AMD CPUs. However the _PSD table of new AMD CPUs (Family 19h+)
> now accurately reports the P-state dependency of CPU cores. Hence this
> quirk needs to be fixed in order to support new CPUs' frequency control.
>
> Fixes: acd316248205 ("acpi-cpufreq: Add quirk to disable _PSD usage on all AMD CPUs")
> Signed-off-by: Wei Huang <wei.huang2@....com>
> ---
>  drivers/cpufreq/acpi-cpufreq.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index e4ff681faaaa..1e4fbb002a31 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -691,7 +691,8 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
>                 cpumask_copy(policy->cpus, topology_core_cpumask(cpu));
>         }
>
> -       if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
> +       if (check_amd_hwpstate_cpu(cpu) && boot_cpu_data.x86 < 0x19 &&
> +           !acpi_pstate_strict) {
>                 cpumask_clear(policy->cpus);
>                 cpumask_set_cpu(cpu, policy->cpus);
>                 cpumask_copy(data->freqdomain_cpus,
> --

Applied as 5.10-rc material under edited subject, thanks!