linux-kernel - Re: [PATCH v4 1/7] dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183

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Message-ID: <20200306144336.GA9234@arm.com>
Date:   Fri, 6 Mar 2020 14:43:36 +0000
From:   Steven Price <steven.price@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     Nick Fan <nick.fan@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Sj Huang <sj.huang@...iatek.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <Mark.Rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v4 1/7] dt-bindings: gpu: mali-bifrost: Add Mediatek
 MT8183

On Fri, Mar 06, 2020 at 02:13:08PM +0000, Rob Herring wrote:
> On Thu, Mar 5, 2020 at 8:34 PM Nick Fan <nick.fan@...iatek.com> wrote:
> >
> > Sorry for my late reply.
> > I have checked internally.
> > The MT8183_POWER_DOMAIN_MFG_2D is just a legacy name, not really 2D
> > domain.
> >
> > If the naming too confusing, we can change this name to
> > MT8183_POWER_DOMAIN_MFG_CORE2 for consistency.
> 
> Can you clarify what's in each domain? Are there actually 3 shader
> cores (IIRC, that should be discoverable)?

The cover letter from Nicolas includes:

> [  501.321752] panfrost 13040000.gpu: shader_present=0x7 l2_present=0x1

0x7 is three bits set, so it certainly looks like there are 3 shader
cores. Of course I wouldn't guarantee that it is as simple as each power
domain has a shader core in. The job manager and tiler also need to be
powered somehow, so they are either sharing with a shader core or
there's something more complex going on.

Steve