linux-kernel - Re: [PATCH 2/2] cpufreq: intel_pstate: Enable HWP without EPP feature

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Message-ID: <dfcf7e0e55a9110c9c90334c46637c61e4cb98c7.camel@linux.intel.com>
Date: Wed, 10 Sep 2025 08:40:11 -0700
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: viresh.kumar@...aro.org, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cpufreq: intel_pstate: Enable HWP without EPP
 feature

On Wed, 2025-09-10 at 12:08 +0200, Rafael J. Wysocki wrote:
> On Sat, Sep 6, 2025 at 6:13 PM Rafael J. Wysocki <rafael@...nel.org>
> wrote:
> > 
> > On Fri, Sep 5, 2025 at 11:02 PM Rafael J. Wysocki
> > <rafael@...nel.org> wrote:
> > > 
> > > On Thu, Sep 4, 2025 at 2:06 AM Srinivas Pandruvada
> > > <srinivas.pandruvada@...ux.intel.com> wrote:
> > > > 
> > > > When EPP feature is not available (CPUID CPUID.06H:EAX[10] is
> > > > not set),
> > > > intel_pstate will not enable HWP.
> > > > 
> > > > Some processors support DEC feature (Dynamic Efficiency
> > > > Control). But in
> > > > this case HWP must be enabled.
> > > > 
> > > > So, enable HWP even if EPP feature is not available but DEC
> > > > feature is
> > > > present.
> > > > 
> > > > When EPP feature is not available don't publish sysfs
> > > > attributes
> > > > "energy_performance_available_preferences" and
> > > > "energy_performance_preference", but continue to enable HWP.
> > > > 
> > > > 

[...]

> > 
> > Attached is a new version, please let me know if it works for you.
> 
> Any chance to have a look at the latest patch?
That patch looks good.

Thanks,
Srinivas