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From: Henry Chen <henryc.chen@mediatek.com>
To: Georgi Djakov <georgi.djakov@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Nicolas Boichat <drinkcat@google.com>,
	Mike Turquette <mturquette@linaro.org>,
	<srv_heupstream@mediatek.com>,
	James Liao <jamesjj.liao@mediatek.com>,
	Viresh Kumar <vireshk@kernel.org>, <linux-pm@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, Rob Herring <robh+dt@kernel.org>,
	"Stephen Boyd" <swboyd@chromium.org>,
	Fan Chen <fan.chen@mediatek.com>, <devicetree@vger.kernel.org>,
	Mark Brown <broonie@kernel.org>,
	Ryan Case <ryandcase@chromium.org>,
	Arvin Wang <arvin.wang@mediatek.com>,
	"Matthias Brugger" <matthias.bgg@gmail.com>,
	<linux-mediatek@lists.infradead.org>,
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH V4 00/13] Add driver for dvfsrc, support for active state of scpsys
Date: Thu, 2 Apr 2020 10:48:02 +0800	[thread overview]
Message-ID: <1585795682.27527.12.camel@mtksdaap41> (raw)
In-Reply-To: <2737cc5c-3876-6861-c44f-fc9f552bbdb9@linaro.org>

Hi Georgi,

On Wed, 2020-04-01 at 18:09 +0300, Georgi Djakov wrote:
> Hi Henry,
> 
> On 3/13/20 11:34, 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 3 frameworks basically:
> > 
> > 1. interconnect framework: to aggregate the bandwidth
> >    requirements from different clients
> > 
> > [1] https://patchwork.kernel.org/cover/10766329/
> > 
> > Below is the emi bandwidth map of mt8183. There has a hw module "DRAM scheduler"
> > which used to control the throughput. The DVFSRC will collect forecast data
> > of dram bandwidth from SW consumers(camera/gpu...), and according the forecast
> > to change the DRAM frequency
> > 
> >            ICC provider         ICC Nodes
> >                             ----          ----
> >            ---------       |CPU |   |--->|VPU |
> >   -----   |         |-----> ----    |     ----
> >  |DRAM |--|DRAM     |       ----    |     ----
> >  |     |--|scheduler|----->|GPU |   |--->|DISP|
> >  |     |--|(EMI)    |       ----    |     ----
> >  |     |--|         |       -----   |     ----
> >   -----   |         |----->|MMSYS|--|--->|VDEC|
> >            ---------        -----   |     ----
> >              /|\                    |     ----
> >               |change DRAM freq     |--->|VENC|
> >            ----------               |     ----
> >           |  DVFSR   |              |
> >           |          |              |     ----
> >            ----------               |--->|IMG |
> >                                     |     ----
> >                                     |     ----
> >                                     |--->|CAM |
> >                                           ----
> 
> It would be useful to also add the above diagram into the commit text of
> patch 09/13. By doing so, it will be saved into the history, as cover letters
> are discarded.
OK, thanks.
> 
> Thanks,
> Georgi
> 
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek


      reply	other threads:[~2020-04-02  2:48 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13  9:34 [PATCH V4 00/13] Add driver for dvfsrc, support for active state of scpsys Henry Chen
2020-03-13  9:34 ` [PATCH V4 01/13] dt-bindings: soc: Add dvfsrc driver bindings Henry Chen
2020-03-13  9:34 ` [PATCH V4 02/13] dt-bindings: soc: Add opp table on scpsys bindings Henry Chen
2020-03-13  9:34 ` [PATCH V4 03/13] soc: mediatek: add support for the performance state Henry Chen
2020-03-13  9:34 ` [PATCH V4 04/13] arm64: dts: mt8183: add performance state support of scpsys Henry Chen
2020-03-13  9:34 ` [PATCH V4 05/13] soc: mediatek: add header for mediatek SIP interface Henry Chen
2020-03-13  9:34 ` [PATCH V4 06/13] soc: mediatek: add MT8183 dvfsrc support Henry Chen
2020-04-01 14:41   ` Georgi Djakov
2020-04-02  2:48     ` Henry Chen
2020-03-13  9:34 ` [PATCH V4 07/13] arm64: dts: mt8183: add dvfsrc related nodes Henry Chen
2020-03-13  9:34 ` [PATCH V4 08/13] dt-bindings: interconnect: add MT8183 interconnect dt-bindings Henry Chen
2020-03-20 23:09   ` Rob Herring
2020-03-13  9:34 ` [PATCH V4 09/13] interconnect: mediatek: Add mt8183 interconnect provider driver Henry Chen
2020-04-01 14:55   ` Georgi Djakov
2020-04-02  2:48     ` Henry Chen
2020-03-13  9:34 ` [PATCH V4 10/13] arm64: dts: mt8183: add dvfsrc related nodes Henry Chen
     [not found] ` <1584092066-24425-12-git-send-email-henryc.chen@mediatek.com>
2020-03-24 20:38   ` [PATCH V4 11/13] dt-bindings: regulator: add DVFSRC regulator dt-bindings Mark Brown
2020-03-30  5:19     ` Henry Chen
2020-04-01 15:09 ` [PATCH V4 00/13] Add driver for dvfsrc, support for active state of scpsys Georgi Djakov
2020-04-02  2:48   ` Henry Chen [this message]

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