linux-kernel - Re: [PATCH 2/2][v2] cpufreq: intel_pstate: Get percpu max freq via HWP MSR register if available

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Message-ID: <20210112032822.GA28619@chenyu-office.sh.intel.com>
Date:   Tue, 12 Jan 2021 11:28:22 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhang Rui <rui.zhang@...el.com>,
        Wendy Wang <wendy.wang@...el.com>
Subject: Re: [PATCH 2/2][v2] cpufreq: intel_pstate: Get percpu max freq via
 HWP MSR register if available

On Mon, Jan 11, 2021 at 03:11:02AM -0800, Srinivas Pandruvada wrote:
> On Mon, 2021-01-11 at 15:43 +0800, Chen Yu wrote:
> > Currently when turbo is disabled(either by BIOS or by the user), the
> > intel_pstate
> > driver reads the max frequency from the package-wide
> > MSR_PLATFORM_INFO(0xce) register.
> > However on asymmetric platforms it is possible in theory that small
> > and big core with
> > HWP enabled might have different max cpu frequency
> max non-turbo frequency (although code call max_freq).
>
Okay, will change.

Thanks,
Chenyu
> Thanks,
> Srinivas
>