linux-kernel - Re: [PATCH v4 0/7] Add dts for mt8183 GPU (and misc panfrost patches)

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Date:   Fri, 7 Feb 2020 09:13:37 +0100
From:   Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v4 0/7] Add dts for mt8183 GPU (and misc panfrost patches)

On 2/7/20 8:42 AM, Nicolas Boichat wrote:
> On Fri, Feb 7, 2020 at 2:18 PM Tomeu Vizoso <tomeu.vizoso@...labora.com> wrote:
>>
>> On 2/7/20 6:26 AM, Nicolas Boichat wrote:
>>> Hi!
>>>
>>> Follow-up on the v3: https://patchwork.kernel.org/cover/11331343/.
>>>
>>> The main purpose of this series is to upstream the dts change and the
>>> binding document, but I wanted to see how far I could probe the GPU, to
>>> check that the binding is indeed correct. The rest of the patches are
>>> RFC/work-in-progress, but I think some of them could already be picked up.
>>>
>>> So this is tested on MT8183 with a chromeos-4.19 kernel, and a ton of
>>> backports to get the latest panfrost driver (I should probably try on
>>> linux-next at some point but this was the path of least resistance).
>>>
>>> I tested it as a module as it's more challenging (originally probing would
>>> work built-in, on boot, but not as a module, as I didn't have the power
>>> domain changes, and all power domains are on by default during boot).
>>>
>>> Probing logs looks like this, currently. They look sane.
>>> [  501.319728] panfrost 13040000.gpu: clock rate = 511999970
>>> [  501.320041] panfrost 13040000.gpu: Linked as a consumer to regulator.14
>>> [  501.320102] panfrost 13040000.gpu: Linked as a consumer to regulator.31
>>> [  501.320651] panfrost 13040000.gpu: Linked as a consumer to genpd:0:13040000.gpu
>>> [  501.320954] panfrost 13040000.gpu: Linked as a consumer to genpd:1:13040000.gpu
>>> [  501.321062] panfrost 13040000.gpu: Linked as a consumer to genpd:2:13040000.gpu
>>> [  501.321734] panfrost 13040000.gpu: mali-g72 id 0x6221 major 0x0 minor 0x3 status 0x0
>>> [  501.321741] panfrost 13040000.gpu: features: 00000000,13de77ff, issues: 00000000,00000400
>>> [  501.321747] panfrost 13040000.gpu: Features: L2:0x07120206 Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7
>>> [  501.321752] panfrost 13040000.gpu: shader_present=0x7 l2_present=0x1
>>> [  501.324951] [drm] Initialized panfrost 1.1.0 20180908 for 13040000.gpu on minor 2
>>>
>>> Some more changes are still required to get devfreq working, and of course
>>> I do not have a userspace driver to test this with.
>>
>> Have you tried the Panfrost tests in IGT? They are atm quite basic, but
>> could be interesting to check that the different HW units are correctly
>> powered on.
> 
> I haven't, you mean this right?
> https://gitlab.freedesktop.org/tomeu/igt-gpu-tools/tree/panfrost

Yes, though may be better to use the upstream repo:

https://gitlab.freedesktop.org/drm/igt-gpu-tools

> Any specific test you have in mind?

All the panfrost ones, but looks like panfrost_prime:gem-prime-import is 
failing atm:

https://lava.collabora.co.uk/scheduler/job/2214987

Cheers,

Tomeu

> Thanks,
> 
>> Regards,
>>
>> Tomeu
>>
>>> I believe at least patches 1, 2, and 3 can be merged. 4 and 5 are mostly
>>> useful in conjunction with 6 and 7 (which are not ready yet), so I'll let
>>> maintainers decide.
>>>
>>> Thanks!
>>>
>>> Nicolas Boichat (7):
>>>     dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183
>>>     arm64: dts: mt8183: Add node for the Mali GPU
>>>     drm/panfrost: Improve error reporting in panfrost_gpu_power_on
>>>     drm/panfrost: Add support for multiple regulators
>>>     drm/panfrost: Add support for multiple power domains
>>>     RFC: drm/panfrost: Add mt8183-mali compatible string
>>>     RFC: drm/panfrost: devfreq: Add support for 2 regulators
>>>
>>>    .../bindings/gpu/arm,mali-bifrost.yaml        |  25 ++++
>>>    arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |   7 +
>>>    arch/arm64/boot/dts/mediatek/mt8183.dtsi      | 105 +++++++++++++++
>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c   |  17 +++
>>>    drivers/gpu/drm/panfrost/panfrost_device.c    | 123 +++++++++++++++---
>>>    drivers/gpu/drm/panfrost/panfrost_device.h    |  27 +++-
>>>    drivers/gpu/drm/panfrost/panfrost_drv.c       |  41 ++++--
>>>    drivers/gpu/drm/panfrost/panfrost_gpu.c       |  11 +-
>>>    8 files changed, 326 insertions(+), 30 deletions(-)
>>>