linux-kernel - Re: [PATCH 2/2] cpufreq: acpi-cpufreq: Add processor to the ignore PSD override list

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Date:   Fri, 11 Dec 2020 00:03:32 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Punit Agrawal <punitagrawal@...il.com>
Cc:     rjw@...ysocki.net, wei.huang2@....com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 2/2] cpufreq: acpi-cpufreq: Add processor to the ignore
 PSD override list

On Fri, Dec 11, 2020 at 07:56:40AM +0900, Punit Agrawal wrote:
> Booting Linux on a Zen2 based processor (family: 0x17, model: 0x60,
> stepping: 0x1) shows the following message in the logs -
> 
>     acpi_cpufreq: overriding BIOS provided _PSD data
> 
> Although commit 5368512abe08 ("acpi-cpufreq: Honor _PSD table setting
> on new AMD CPUs") indicates that the override is not required for Zen3
> onwards, it seems that domain information can be trusted even on
> certain earlier systems. Update the check, to skip the override for
> Zen2 processors known to work without the override.
> 
> Signed-off-by: Punit Agrawal <punitagrawal@...il.com>
> Cc: Wei Huang <wei.huang2@....com>
> ---
>  drivers/cpufreq/acpi-cpufreq.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)

What about answers to those questions first?

https://lkml.kernel.org/r/20201208233216.GH27920@zn.tnic

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette