Re: [PATCH v3 2/2] cpufreq: CPPC: add autonomous mode boot parameter support

[Randy Dunlap]

On 5/15/26 5:26 AM, Sumit Gupta wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 0eb64aab3685..7e4b3a8fd76f 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1048,6 +1048,22 @@ Kernel parameters
>  			policy to use. This governor must be registered in the
>  			kernel before the cpufreq driver probes.
>  
> +	cppc_cpufreq.auto_sel_mode=
> +			[CPU_FREQ] Enable ACPI CPPC autonomous performance

I just noticed that we should have both CPU_FREQ and CPU_IDLE added to the
legend (meanings) section at the very beginning of this file, but that
doesn't have to be part of this patch.

> +			selection. When enabled, hardware automatically adjusts
> +			CPU frequency on all CPUs based on workload demands.
> +			In Autonomous mode, Energy Performance Preference (EPP)
> +			hints guide hardware toward performance (0x0) or energy
> +			efficiency (0xff).
> +			Requires ACPI CPPC autonomous selection register
> +			support.
> +			Accepts:
> +			  performance, 1: enable auto_sel + set EPP to
> +					  performance (0x0)
> +			  default_epp, 2: enable auto_sel, preserve EPP value
> +					  programmed by BIOS/firmware
> +			Unset: cpufreq governors are used (auto_sel disabled).

-- 
~Randy