From: Randy Dunlap <rdunlap@infradead.org>
To: Sumit Gupta <sumitg@nvidia.com>,
rafael@kernel.org, viresh.kumar@linaro.org,
pierre.gondois@arm.com, ionela.voinescu@arm.com,
zhenglifeng1@huawei.com, zhanjie9@hisilicon.com, corbet@lwn.net,
skhan@linuxfoundation.org, mario.limonciello@amd.com,
linux-pm@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: linux-tegra@vger.kernel.org, treding@nvidia.com,
jonathanh@nvidia.com, vsethi@nvidia.com, ksitaraman@nvidia.com,
sanjayc@nvidia.com, mochs@nvidia.com, bbasu@nvidia.com
Subject: Re: [PATCH v3 2/2] cpufreq: CPPC: add autonomous mode boot parameter support
Date: Fri, 15 May 2026 15:14:52 -0700 [thread overview]
Message-ID: <b4516579-c4bf-4ddd-843a-30d4a4992519@infradead.org> (raw)
In-Reply-To: <20260515122624.1920637-3-sumitg@nvidia.com>
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
prev parent reply other threads:[~2026-05-15 22:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-15 12:26 [PATCH v3 0/2] cpufreq: CPPC: add autonomous mode boot parameter support Sumit Gupta
2026-05-15 12:26 ` [PATCH v3 1/2] cpufreq: CPPC: Set CPPC Enable register in cpu_init Sumit Gupta
2026-05-15 12:26 ` [PATCH v3 2/2] cpufreq: CPPC: add autonomous mode boot parameter support Sumit Gupta
2026-05-15 21:13 ` Mario Limonciello
2026-05-15 22:14 ` Randy Dunlap [this message]
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