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Subject: Re: [PATCH v13 0/4] drm/panfrost: Add support for mt8183 GPU
To:     Neil Armstrong <narmstrong@baylibre.com>,
        Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Cc:     Nicolas Boichat <drinkcat@chromium.org>,
        Rob Herring <robh@kernel.org>,
        Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
        devicetree <devicetree@vger.kernel.org>,
        Tomeu Vizoso <tomeu.vizoso@collabora.com>, fshao@chromium.org,
        David Airlie <airlied@linux.ie>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Boris Brezillon <boris.brezillon@collabora.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        dri-devel <dri-devel@lists.freedesktop.org>, hsinyi@chromium.org,
        Matthias Brugger <matthias.bgg@gmail.com>,
        hoegsberg@chromium.org,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
References: <20210421052855.1279713-1-drinkcat@chromium.org>
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 <373d0803-8658-9413-2f51-1e9804c39126@baylibre.com>
From:   Steven Price <steven.price@arm.com>
Message-ID: <ce401ca2-e285-4fcf-0583-c1dae94dba6a@arm.com>
Date:   Fri, 14 May 2021 16:27:08 +0100
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On 14/05/2021 15:48, Neil Armstrong wrote:
> On 13/05/2021 16:55, Ezequiel Garcia wrote:
>> Hi Neil,
>>
>> On Mon, 26 Apr 2021 at 06:59, Neil Armstrong <narmstrong@baylibre.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 :-)

You make a convincing point - and if everyone is happy for the DT
changes to be handled separately I don't see a reason for the other
patches to be held up.

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

I seem to be applying most Panfrost changes these days, so I'll save you
the effort and push 1,3,4 to drm-misc-next.

Thanks,

Steve