linux-kernel - Re: [PATCH 0/5] AMD Pstate driver Urgent Change

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Message-ID: <Y3XIJLgIR0aXt3hO@amd.com>
Date:   Thu, 17 Nov 2022 13:35:32 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Yuan, Perry" <Perry.Yuan@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Karny, Wyes" <Wyes.Karny@....com>,
        "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
        "Narayan, Ananth" <Ananth.Narayan@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] AMD Pstate driver Urgent Change

On Thu, Nov 17, 2022 at 10:49:50AM +0800, Yuan, Perry wrote:
> The patchset changed amd-pstate driver as built-in type to resolve the
> driver loading sequence problem, otherwise the acpi-cpufreq driver will
> be loaded as the default cpufreq scaling driver instead of amd-pstate.
> 
> Some new kernel parameters are added to allow user to disable pstate driver
> and load driver with passive mode which use governors to do the
> frequency scaling control.
> 
> * `amd_pstate=disabled` or no parameters will not load pstate driver.
> * `amd_pstate=passive` will load pstate driver with passive mode.
> 
> Set the `amd_pstate` driver disabled by default because of performance
> degradation on a number of AMD ASICs in the passive mode driver,
> especially the shared memory support processors.
> 
> EPP support for the amd_pstate driver is under review. With EPP support,
> the said performance issue is resolved. Once that gets upstream,
> the `active` mode amd_pstate_epp driver may be enabled by default.
> 
> Perry Yuan (4):
>   cpufreq: amd-pstate: change amd-pstate driver to be built-in type
>   cpufreq: amd-pstate: add amd-pstate driver parameter for mode
>     selection
>   Documentation: amd-pstate: add driver working mode introduction
>   Documentation: add amd-pstate kernel command line options
> 
> Wyes Karny (1):
>   cpufreq: amd-pstate: cpufreq: amd-pstate: reset MSR_AMD_PERF_CTL
>     register at init

Series are Acked-by: Huang Rui <ray.huang@....com>

Hi Rafeal,

These series are the fixes for our new processors. Would you mind to merge
them into pm-6.1-rc6 or pm-6.1-rc7?

Thanks,
Ray