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Subject: Re: [PATCH v13 0/4] drm/panfrost: Add support for mt8183 GPU
To:     Steven Price <steven.price@arm.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>
 <c91746ce-88b6-5612-74a5-74600c7761e8@baylibre.com>
 <CAAEAJfD3i+L4w1NuE5pUkMuH=R3CfBztDn-ZLcYR=onkcZ4Gxg@mail.gmail.com>
 <373d0803-8658-9413-2f51-1e9804c39126@baylibre.com>
 <ce401ca2-e285-4fcf-0583-c1dae94dba6a@arm.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
Organization: Baylibre
Message-ID: <8e35886c-7b51-aa93-5f9c-df0fae635828@baylibre.com>
Date:   Mon, 17 May 2021 12:24:51 +0200
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On 14/05/2021 17:27, Steven Price wrote:
> 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 !

Neil

> 
> Thanks,
> 
> Steve
>