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: <1546525883.6818.62.camel@mtksdaap41>
Date:   Thu, 3 Jan 2019 22:31:23 +0800
From:   Henry Chen <henryc.chen@...iatek.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
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 Thu, 2019-01-03 at 10:18 +0530, Viresh Kumar wrote:
> 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.
> 

Thanks for your review and the comments.
Henry