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

[Sumit Gupta]

Hi Randy,


On 16/05/26 03:44, Randy Dunlap wrote:
> 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.

Thanks.
Will send a separate patch adding CPU_FREQ and CPU_IDLE to the legend.

Thank you,
Sumit Gupta


> > +			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).