linux-kernel - Re: [PATCH v4 0/8] Enhanced autonomous selection and improvements

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Message-ID: <hjrcoq7dapqcodk3iiyvjeuq3cwvyccqr4wnlcoi6eduqg5ahf@tszrjvfnkjux>
Date: Mon, 10 Nov 2025 16:30:52 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Sumit Gupta <sumitg@...dia.com>, pierre.gondois@....com, 
	zhanjie9@...ilicon.com, ionela.voinescu@....com, beata.michalska@....com
Cc: rafael@...nel.org, lenb@...nel.org, robert.moore@...el.com, 
	corbet@....net, zhenglifeng1@...wei.com, rdunlap@...radead.org, 
	ray.huang@....com, gautham.shenoy@....com, mario.limonciello@....com, 
	perry.yuan@....com, linux-pm@...r.kernel.org, linux-acpi@...r.kernel.org, 
	linux-doc@...r.kernel.org, acpica-devel@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	linux-tegra@...r.kernel.org, treding@...dia.com, jonathanh@...dia.com, vsethi@...dia.com, 
	ksitaraman@...dia.com, sanjayc@...dia.com, nhartman@...dia.com, bbasu@...dia.com
Subject: Re: [PATCH v4 0/8] Enhanced autonomous selection and improvements

On 05-11-25, 17:08, Sumit Gupta wrote:
> This patch series enhances the ACPI CPPC CPUFREQ driver with
> comprehensive support for autonomous performance selection, expanded
> runtime control interfaces and improvements.
> 
> It adds support for below:
> - Expose sysfs to read/write the Minimum/Maximum Performance Registers
>   using frequency (kHz), with internal conversion to performance values.
>   Also, update the policy min/max accordingly.
>     /sys/.../cpufreq/policy*/min_perf and max_perf
> 
> - Expose sysfs to read/write the Performance Limited Register.
>     /sys/.../cpufreq/policy*/perf_limited
> 
> - When toggling autonomous selection, synchronize the policy limits
>   by updating the policy min/max.
> 
> - System-wide autonomous mode configuration via 'auto_sel_mode' boot
>   parameter. Mode can be switched dynamically on individual CPUs.
> 
> - Generic sysfs helper functions to reduce code duplication.
> 
> The patches are grouped as below:
> - Patch 1, 2 & 3: Improvements. Can be applied independently.
> - Patch 4: Sysfs to update min/max_perf. Can be applied independently.
> - Patch 5: Sysfs to update perf_limited. Can be applied independently.
> - Patch 6: add sysfs documentation. Depends on 'Patch 4 and 5'.
> - Patch 7: sync policy min/max with auto_select. Depends on 'Patch 4'.
> - Patch 8: Boot Parameter Support. Depends on 'Patch 4 and 7'.

Beata/Ionela/Jie, any feedback on the CPPC changes ?

-- 
viresh