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

From: Neil Armstrong
Date: Fri May 14 2021 - 10:48:59 EST


On 13/05/2021 16:55, Ezequiel Garcia wrote:
> Hi Neil,
>
> On Mon, 26 Apr 2021 at 06:59, Neil Armstrong <narmstrong@xxxxxxxxxxxx> 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@xxxxxxxxxxxx/
>>> [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
>