Re: [PATCH v2 0/5] Add CPPC HighestFreq support

[K Prateek Nayak <kprateek.nayak@amd.com>]

Hello Mario,

On 5/5/2026 4:31 AM, Mario Limonciello wrote:
> On some systems, the boost ratio cannot be accurately calculated
> using linear interpolation of CPPC performance values because the
> performance-to-frequency mapping is not linear across all cores.
> 
> This series introduces support for the CPPC HighestFreq register.  This
> register is under a proposal with ASWG at the moment and trending for
> inclusion in ACPI 6.7.
> 
> This optionally provides the actual highest frequency eliminating
> the need for interpolation. When available, this frequency value is used
> for more accurate CPU capacity calculations and boost ratio determination.
> 
> This series brings the existing CPPC definitions up to ACPI 6.6 and then
> adds support for the ACPI 6.7 proposal.
> 
> ---
> v2:
>  * Drop CPPC v4 patches, these are submitted separately by Sumit Gupta [1]
> 
> Link: https://lore.kernel.org/linux-pm/20260430142430.755437-1-sumitg@nvidia.com/ [1]

I tested the series on top of v7.1-rc2 + Sumit's patch with both
amd-pstate and acpi-cpufreq on my 3rd Generation EPYC and everything
seems to be in order. Feel free to include:

Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>

-- 
Thanks and Regards,
Prateek