linux-kernel - [PATCH v9 0/4] drm/panfrost: Add support for mt8183 GPU

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Message-Id: <20210108011011.4061575-1-drinkcat@chromium.org>
Date:   Fri,  8 Jan 2021 09:10:07 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Rob Herring <robh@...nel.org>, Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Cc:     fshao@...omium.org, hoegsberg@...omium.org, hsinyi@...omium.org,
        boris.brezillon@...labora.com,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Nicolas Boichat <drinkcat@...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: [PATCH v9 0/4] drm/panfrost: Add support for mt8183 GPU

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).

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 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        |  25 +++++
 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, 161 insertions(+)

-- 
2.29.2.729.g45daf8777d-goog