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

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Message-ID: <87360boqyh.fsf@stealth>
Date:   Sat, 12 Dec 2020 08:36:38 +0900
From:   Punit Agrawal <punitagrawal@...il.com>
To:     Borislav Petkov <bp@...en8.de>
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

Borislav Petkov <bp@...en8.de> writes:

> 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

Oh.. sorry I missed that mail for some reason. Let's continue
there.