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

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Date:   Thu, 14 Feb 2019 11:39:22 +0000
From:   John Garry <john.garry@...wei.com>
To:     Xiongfeng Wang <wangxiongfeng2@...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 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.

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(+)
>