linux-kernel - Re: [REGRESSION] amd-pstate doesn't work since v5.18.11

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Date:   Tue, 12 Jul 2022 23:55:05 +0200
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     "Yuan, Perry" <Perry.Yuan@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Huang, Ray" <Ray.Huang@....com>,
        "Limonciello, Mario" <mario.limonciello@....com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [REGRESSION] amd-pstate doesn't work since v5.18.11

Hello.

On úterý 12. července 2022 22:07:15 CEST Limonciello, Mario wrote:
> See if this helps out:
> 
> diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c
> index 734b96454896..88a81e6b9228 100644
> --- a/arch/x86/kernel/acpi/cppc.c
> +++ b/arch/x86/kernel/acpi/cppc.c
> @@ -16,6 +16,13 @@ bool cpc_supported_by_cpu(void)
>          switch (boot_cpu_data.x86_vendor) {
>          case X86_VENDOR_AMD:
>          case X86_VENDOR_HYGON:
> +               if (boot_cpu_data.x86 == 0x19 &&
> +                   ((boot_cpu_data.x86_model >= 0x00 && 
> boot_cpu_data.x86_model <= 0x0f) ||
> +                   (boot_cpu_data.x86_model >= 0x20 && 
> boot_cpu_data.x86_model <= 0x2f)))
> +                       return true;
> +               else if (boot_cpu_data.x86 == 0x17 &&
> +                        boot_cpu_data.x86_model >= 0x70 && 
> boot_cpu_data.x86_model <= 0x7f)
> +                       return true;
>                  return boot_cpu_has(X86_FEATURE_CPPC);
>          }
>          return false;
> 
> If that works and no one has a better idea how to do it for these 
> systems I'll send out a proper proper patch tomorrow.

This patch (also mirrored here [1]) works for me, thanks.

[1] https://codeberg.org/pf-kernel/linux/commit/cc5c57b8c349c85b81b44cf5fe2d2577b947a7de

-- 
Oleksandr Natalenko (post-factum)