linux-kernel - Re: [PATCH v10 0/4] drm/panfrost: Add support for mt8183 GPU

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Message-ID: <3fa8f9c5-5956-73fc-e464-4df68a564b64@collabora.com>
Date:   Wed, 13 Jan 2021 08:17:38 +0100
From:   Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:     Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh@...nel.org>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Cc:     fshao@...omium.org, boris.brezillon@...labora.com,
        hsinyi@...omium.org, hoegsberg@...omium.org,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v10 0/4] drm/panfrost: Add support for mt8183 GPU

On 1/13/21 7:06 AM, Nicolas Boichat wrote:
> Hi!
> 
> Follow-up on the v5 [1], things have gotten significantly
> better in the last 9 months, thanks to the efforts on Bifrost
> support by the Collabora team (and probably others I'm not
> aware of).
> 
> I've been testing this series on a MT8183/kukui device, with a
> chromeos-5.10 kernel [2], and got basic Chromium OS UI up with
> mesa 20.3.2 (lots of artifacts though).

Btw, don't know if you plan to retest with a newer Mesa, but a recent 
master should have pretty good ES 3.0 compliance on the Duet.

Cheers,

Tomeu

> devfreq is currently not supported, as we'll need:
>   - Clock core support for switching the GPU core clock (see 2/4).
>   - Platform-specific handling of the 2-regulator (see 3/4).
> 
> Since the latter is easy to detect, patch 3/4 just disables
> devfreq if the more than one regulator is specified in the
> compatible matching table.
> 
> [1] https://patchwork.kernel.org/project/linux-mediatek/cover/20200306041345.259332-1-drinkcat@chromium.org/
> [2] https://crrev.com/c/2608070
> 
> Changes in v10:
>   - Fix the binding to make sure sram-supply property can be provided.
> 
> Changes in v9:
>   - Explain why devfreq needs to be disabled for GPUs with >1
>     regulators.
> 
> Changes in v8:
>   - Use DRM_DEV_INFO instead of ERROR
> 
> Changes in v7:
>   - Fix GPU ID in commit message
>   - Fix GPU ID in commit message
> 
> Changes in v6:
>   - Rebased, actually tested with recent mesa driver.
> 
> Nicolas Boichat (4):
>    dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183
>    arm64: dts: mt8183: Add node for the Mali GPU
>    drm/panfrost: devfreq: Disable devfreq when num_supplies > 1
>    drm/panfrost: Add mt8183-mali compatible string
> 
>   .../bindings/gpu/arm,mali-bifrost.yaml        |  28 +++++
>   arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |   6 +
>   .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |   6 +
>   arch/arm64/boot/dts/mediatek/mt8183.dtsi      | 105 ++++++++++++++++++
>   drivers/gpu/drm/panfrost/panfrost_devfreq.c   |   9 ++
>   drivers/gpu/drm/panfrost/panfrost_drv.c       |  10 ++
>   6 files changed, 164 insertions(+)
>