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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <028166CD-55C8-4FC6-AEBB-C190D20290D5@arm.com>
Date:   Wed, 6 May 2020 12:58:22 +0000
From:   Thanu Rangarajan <Thanu.Rangarajan@....com>
To:     Sudeep Holla <Sudeep.Holla@....com>,
        "guohanjun@...wei.com" <guohanjun@...wei.com>
CC:     Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "john.garry@...wei.com" <john.garry@...wei.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>
Subject: Re: [RFC PATCH] cpufreq: add support for HiSilicon SoC HIP09

Hi,
ACPI CPPC already supports the notion of boost. Not sure we need any enhancements there.

Regards,
Thanu

On 06/05/2020, 18:19, "Sudeep Holla" <sudeep.holla@....com> wrote:

    + 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


IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.