linux-kernel - Re: [PATCH v2 0/2] Work around for Hisilicon CPPC cpufreq

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Message-ID: <851b2825-3324-cfc4-0806-d4aa7ef577cd@huawei.com>
Date:   Thu, 14 Feb 2019 21:27:04 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     John Garry <john.garry@...wei.com>, <viresh.kumar@...aro.org>,
        <rafael@...nel.org>, <gcherianv@...il.com>,
        <pprakash@...eaurora.org>, <george.cherian@...ium.com>,
        <robert.moore@...el.com>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <guohanjun@...wei.com>
Subject: Re: [PATCH v2 0/2] Work around for Hisilicon CPPC cpufreq



On 2019/2/14 19:39, John Garry wrote:
> On 14/02/2019 07:46, Xiongfeng Wang wrote:
>> Hisilicon chips do not support delivered performance counter register
>> and reference performance counter register. But the platform can
>> calculate the real performance using its own method. This patch provide
>> a workaround for this problem, and other platforms can also use this
>> workaround framework. We reuse the desired performance register to
>> store the real performance calculated by the platform. After the
>> platform finished the frequency adjust, it gets the real performance and
>> writes it into desired performance register. OS can use it to calculate
>> the real frequency.
>>
> 
> It would be convenient for reviewers to detail what changed between versions in future.

Thanks, I will add changelog next time.

Xiongfeng

> 
> John
> 
>> Xiongfeng Wang (2):
>>   ACPI / CPPC: Add a helper to get desired performance
>>   cpufreq / cppc: Work around for Hisilicon CPPC cpufreq
>>
>>  drivers/acpi/cppc_acpi.c       | 38 +++++++++++++++++++++++
>>  drivers/cpufreq/cppc_cpufreq.c | 70 ++++++++++++++++++++++++++++++++++++++++++
>>  include/acpi/cppc_acpi.h       |  1 +
>>  3 files changed, 109 insertions(+)
>>
> 
> 
> 
> .
>