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Subject: Re: [PATCH v13 0/4] drm/panfrost: Add support for mt8183 GPU
To:     Nicolas Boichat <drinkcat@chromium.org>,
        Rob Herring <robh@kernel.org>,
        Steven Price <steven.price@arm.com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Cc:     fshao@chromium.org, hsinyi@chromium.org, hoegsberg@chromium.org,
        Tomeu Vizoso <tomeu.vizoso@collabora.com>,
        boris.brezillon@collabora.com, Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@linux.ie>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-mediatek@lists.infradead.org
References: <20210421052855.1279713-1-drinkcat@chromium.org>
From:   Neil Armstrong <narmstrong@baylibre.com>
Organization: Baylibre
Message-ID: <c91746ce-88b6-5612-74a5-74600c7761e8@baylibre.com>
Date:   Mon, 26 Apr 2021 11:58:59 +0200
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Hi,

On 21/04/2021 07:28, Nicolas Boichat wrote:
> Hi!
> 
> This is just a rebase of the v11, untested (but it seems like
> Neil Armstrong recently tested it), with small changes in
> binding and dts. v11 cover follows:
> 
> Follow-up on the v5 [1], things have gotten significantly
> better in the last year, 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).
> 
> 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 v13:
>  - devfreq: Fix conflict resolution mistake when rebasing, didn't
>    even compile. Oops.
> 
> Changes in v12:
>  - binding: Fix min/maxItems logic (Rob Herring)
>  - Add gpu node to mt8183-pumpkin.dts as well (Neil Armstrong).
> 
> Changes in v11:
>  - binding: power-domain-names not power-domainS-names
>  - mt8183*.dts: remove incorrect supply-names
> 
> 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.
>  - Add gpu regulators to kukui dtsi as well.
>  - Power domains are now attached to spm, not scpsys
>  - Drop R-B.
>  - devfreq: New change
>  - Context conflicts, reflow the code.
>  - Use ARRAY_SIZE for power domains too.
> 
> Changes in v5:
>  - Rename "2d" power domain to "core2"
>  - Rename "2d" power domain to "core2" (keep R-B again).
>  - Change power domain name from 2d to core2.
> 
> Changes in v4:
>  - Add power-domain-names description
>    (kept Alyssa's reviewed-by as the change is minor)
>  - Add power-domain-names to describe the 3 domains.
>    (kept Alyssa's reviewed-by as the change is minor)
>  - Add power domain names.
> 
> Changes in v3:
>  - Match mt8183-mali instead of bifrost, as we require special
>    handling for the 2 regulators and 3 power domains.
> 
> Changes in v2:
>  - Use sram instead of mali_sram as SRAM supply name.
>  - Rename mali@ to gpu@.
> 
> 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        |  30 ++++-
>  arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |   5 +
>  .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |   5 +
>  .../boot/dts/mediatek/mt8183-pumpkin.dts      |   5 +
>  arch/arm64/boot/dts/mediatek/mt8183.dtsi      | 105 ++++++++++++++++++
>  drivers/gpu/drm/panfrost/panfrost_devfreq.c   |   9 ++
>  drivers/gpu/drm/panfrost/panfrost_drv.c       |  10 ++
>  7 files changed, 168 insertions(+), 1 deletion(-)
> 

Seems this version is ready to be applied if we get a review on the DT ?

Mathias ? could you have a look ?

Neil