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

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Date:   Tue, 5 May 2020 10:12:54 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     <rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <guohanjun@...wei.com>, <john.garry@...wei.com>
Subject: Re: [RFC PATCH] cpufreq: add support for HiSilicon SoC HIP09

Hi Sudeep,

Thanks for your reply.

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.

I will try to extend the CPPC to accommodate the CPU Boost feature.

Thanks,
Xiongfeng

> 
> --
> Regards,
> Sudeep
> 
> .
>