linux-kernel - Re: [RFC RESEND PATCH 0/7] Add driver for dvfsrc and add support for active state of scpsys on mt8183

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Message-ID: <20190103044852.l7sxfqeqnxx2xbp5@vireshk-i7>
Date:   Thu, 3 Jan 2019 10:18:52 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Henry Chen <henryc.chen@...iatek.com>
Cc:     Viresh Kumar <vireshk@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Fan Chen <fan.chen@...iatek.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        Kees Cook <keescook@...omium.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC RESEND PATCH 0/7] Add driver for dvfsrc and add support for
 active state of scpsys on mt8183

On 02-01-19, 22:09, Henry Chen wrote:
> The patchsets add support for MediaTek hardware module named DVFSRC
> (dynamic voltage and frequency scaling resource collector). The DVFSRC is
> a HW module which is used to collect all the requests from both software
> and hardware and turn into the decision of minimum operating voltage and
> minimum DRAM frequency to fulfill those requests.
> 
> So, This series is to implement the dvfsrc driver to collect all the
> requests of operating voltage or DRAM bandwidth from other device drivers
> likes GPU/Camera through 2 frameworks basically:
> 
> 1. PM_QOS_MEMORY_BANDWIDTH from PM QOS: to aggregate the bandwidth
>    requirements from different clients
> 2. Active state management of power domains[1]: to handle the operating
>    voltage opp requirement from different power domains

Honestly speaking I wasn't sure if anyone apart from Qcom will ever use this
feature when I wrote it first and I am quite surprised and happy to see your
patches.

They are mostly very neat and clean patches and I don't have complaints with
most of them. Lets see what comments others provide on them.

Thanks.

-- 
viresh