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

Huang Rui
2022-11-17T05:36:17Z

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@amd.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