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Date:   Wed, 6 May 2020 17:36:51 +0800
From:   Hanjun Guo <>
To:     Sudeep Holla <>,
        Xiongfeng Wang <>
CC:     <>, <>,
        <>, <>,
        Jonathan Cameron <>
Subject: Re: [RFC PATCH] cpufreq: add support for HiSilicon SoC HIP09

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?


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