linux-kernel - Re: [RFC PATCH] cpufreq: add support for HiSilicon SoC HIP09

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Date:   Wed, 6 May 2020 12:58:22 +0000
From:   Thanu Rangarajan <Thanu.Rangarajan@....com>
To:     Sudeep Holla <Sudeep.Holla@....com>,
        "guohanjun@...wei.com" <guohanjun@...wei.com>
CC:     Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "john.garry@...wei.com" <john.garry@...wei.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>
Subject: Re: [RFC PATCH] cpufreq: add support for HiSilicon SoC HIP09

Hi,
ACPI CPPC already supports the notion of boost. Not sure we need any enhancements there.

Regards,
Thanu

On 06/05/2020, 18:19, "Sudeep Holla" <sudeep.holla@....com> wrote:

    + Thanu, Souvik who work with ASWG

    On Wed, May 06, 2020 at 05:36:51PM +0800, Hanjun Guo wrote:
    > Hi Sudeep,
    >
    > On 2020/4/30 17:55, Sudeep Holla wrote:
    > > On Thu, Apr 30, 2020 at 02:19:59PM +0800, Xiongfeng Wang wrote:
    > > > HiSilicon SoC has a separate System Control Processor(SCP) dedicated for
    > > > clock frequency adjustment and has been using the cpufreq driver
    > > > 'cppc-cpufreq'. New HiSilicon SoC HIP09 add support for CPU Boost, but
    > > > ACPI CPPC doesn't support this. In HiSilicon SoC HIP09, each core has
    > > > its own clock domain. It is better for the core itself to adjust its
    > > > frequency when we require fast response. In this patch, we add a
    > > > separate cpufreq driver for HiSilicon SoC HIP09.
    > > >
    > >
    > > I disagree with this approach unless you have tried to extend the CPPC
    > > in ACPI to accommodate this boost feature you need. Until you show those
    > > efforts and disagreement to do that from ASWG, I am NACKing this approach.
    >
    > Unfortunately we are not in ASWG at now, could you please give some
    > help about extending CPPC in ACPI to support boost feature?
    >

    You may have to provide more details than the commit log for sure as I
    haven't understood the boost feature and what is missing in ACPI CPPC.

    --
    Regards,
    Sudeep


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