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

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Message-ID: <20200506124932.GA20426@bogus>
Date:   Wed, 6 May 2020 13:49:32 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Hanjun Guo <guohanjun@...wei.com>
Cc:     Xiongfeng Wang <wangxiongfeng2@...wei.com>, rjw@...ysocki.net,
        viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, john.garry@...wei.com,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>,
        Thanu Rangarajan <Thanu.Rangarajan@....com>
Subject: Re: [RFC PATCH] cpufreq: add support for HiSilicon SoC HIP09

+ 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