linux-kernel - Re: [PATCH v13 0/4] drm/panfrost: Add support for mt8183 GPU

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Date:   Fri, 14 May 2021 16:48:52 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:     Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh@...nel.org>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        devicetree <devicetree@...r.kernel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>, fshao@...omium.org,
        David Airlie <airlied@...ux.ie>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>, hsinyi@...omium.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        hoegsberg@...omium.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v13 0/4] drm/panfrost: Add support for mt8183 GPU

On 13/05/2021 16:55, Ezequiel Garcia wrote:
> Hi Neil,
> 
> On Mon, 26 Apr 2021 at 06:59, Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> 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 ?
>>
> 
> Given Rob has Acked the DT bindings, I think it's OK to apply patches
> 1, 3 and 4 via drm-misc, letting Mediatek people sort out the DT changes.
> 
> My two unsolicited cents :-)

Yeah sure, is there a panfrost maintainer in the room ? I can apply them if you ack me.

Neil

> 
> Ezequiel
>