linux-kernel - Re: [PATCH v5 0/4] Add dts for mt8183 GPU (and misc panfrost patches)

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Date:   Fri, 6 Mar 2020 07:35:43 -0500
From:   Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Nick Fan <nick.fan@...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>,
        Steven Price <steven.price@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, hsinyi@...omium.org
Subject: Re: [PATCH v5 0/4] Add dts for mt8183 GPU (and misc panfrost patches)

Series has my r-b :)

On Fri, Mar 06, 2020 at 12:13:41PM +0800, Nicolas Boichat wrote:
> Hi!
> 
> Follow-up on the v4: https://patchwork.kernel.org/cover/11369777/, some
> of the core patches got merged already (thanks Rob!).
> 
> The main purpose of this series is to upstream the dts change and the
> binding document, but I wanted to see how far I could probe the GPU, to
> check that the binding is indeed correct. The rest of the patches are
> RFC/work-in-progress.
> 
> So this is tested on MT8183 with a chromeos-4.19 kernel, and a ton of
> backports to get the latest panfrost driver (I should probably try on
> linux-next at some point but this was the path of least resistance).
> 
> I tested it as a module as it's more challenging (originally probing would
> work built-in, on boot, but not as a module, as I didn't have the power
> domain changes, and all power domains are on by default during boot).
> 
> Probing logs looks like this, currently. They look sane.
> [  501.319728] panfrost 13040000.gpu: clock rate = 511999970
> [  501.320041] panfrost 13040000.gpu: Linked as a consumer to regulator.14
> [  501.320102] panfrost 13040000.gpu: Linked as a consumer to regulator.31
> [  501.320651] panfrost 13040000.gpu: Linked as a consumer to genpd:0:13040000.gpu
> [  501.320954] panfrost 13040000.gpu: Linked as a consumer to genpd:1:13040000.gpu
> [  501.321062] panfrost 13040000.gpu: Linked as a consumer to genpd:2:13040000.gpu
> [  501.321734] panfrost 13040000.gpu: mali-g72 id 0x6221 major 0x0 minor 0x3 status 0x0
> [  501.321741] panfrost 13040000.gpu: features: 00000000,13de77ff, issues: 00000000,00000400
> [  501.321747] panfrost 13040000.gpu: Features: L2:0x07120206 Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7
> [  501.321752] panfrost 13040000.gpu: shader_present=0x7 l2_present=0x1
> [  501.324951] [drm] Initialized panfrost 1.1.0 20180908 for 13040000.gpu on minor 2
> 
> Some more changes are still required to get devfreq working, and of course
> I do not have a userspace driver to test this with.
> 
> I believe at least patches 1 & 2 can be merged (2 depends on another
> patch series, so maybe we could start with 1 only for now...).
> 
> Thanks!
> 
> Nicolas Boichat (4):
>   dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183
>   arm64: dts: mt8183: Add node for the Mali GPU
>   RFC: drm/panfrost: Add mt8183-mali compatible string
>   RFC: drm/panfrost: devfreq: Add support for 2 regulators
> 
>  .../bindings/gpu/arm,mali-bifrost.yaml        |  25 +++++
>  arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |   7 ++
>  arch/arm64/boot/dts/mediatek/mt8183.dtsi      | 105 ++++++++++++++++++
>  drivers/gpu/drm/panfrost/panfrost_devfreq.c   |  17 +++
>  drivers/gpu/drm/panfrost/panfrost_device.h    |   1 +
>  drivers/gpu/drm/panfrost/panfrost_drv.c       |  11 ++
>  6 files changed, 166 insertions(+)
> 
> -- 
> 2.25.1.481.gfbce0eb801-goog
> 

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