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

[Sumit Gupta <sumitg@nvidia.com>]

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).