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From:   Oleksandr Natalenko <oleksandr@natalenko.name>
To:     "Yuan, Perry" <Perry.Yuan@amd.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Huang, Ray" <Ray.Huang@amd.com>,
        "Limonciello, Mario" <mario.limonciello@amd.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Sasha Levin <sashal@kernel.org>,
        "x86@kernel.org" <x86@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [REGRESSION] amd-pstate doesn't work since v5.18.11
Date:   Tue, 12 Jul 2022 23:55:05 +0200
Message-ID: <6967031.z0QvQKZeIK@natalenko.name>
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References: <3559249.JlDtxWtqDm@natalenko.name> <2414945.NDPYyZybsh@natalenko.name> <4c9e3a4c-40b2-3ce9-da88-ad507769658b@amd.com>
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Hello.

On =C3=BAter=C3=BD 12. =C4=8Dervence 2022 22:07:15 CEST Limonciello, Mario =
wrote:
> See if this helps out:
>=20
> 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 =3D=3D 0x19 &&
> +                   ((boot_cpu_data.x86_model >=3D 0x00 &&=20
> boot_cpu_data.x86_model <=3D 0x0f) ||
> +                   (boot_cpu_data.x86_model >=3D 0x20 &&=20
> boot_cpu_data.x86_model <=3D 0x2f)))
> +                       return true;
> +               else if (boot_cpu_data.x86 =3D=3D 0x17 &&
> +                        boot_cpu_data.x86_model >=3D 0x70 &&=20
> boot_cpu_data.x86_model <=3D 0x7f)
> +                       return true;
>                  return boot_cpu_has(X86_FEATURE_CPPC);
>          }
>          return false;
>=20
> If that works and no one has a better idea how to do it for these=20
> 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/cc5c57b8c349c85b81b44cf5fe2=
d2577b947a7de

=2D-=20
Oleksandr Natalenko (post-factum)