linux-kernel - Re: [PATCH v4 00/19] Enable GPU with DVFS support on MediaTek SoCs

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Message-ID: <c0aecb1a-eb84-bc59-4ba1-1af9cf88e72e@gmail.com>
Date:   Thu, 30 Mar 2023 09:49:53 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org
Subject: Re: [PATCH v4 00/19] Enable GPU with DVFS support on MediaTek SoCs



On 01/03/2023 10:55, AngeloGioacchino Del Regno wrote:
> Changes in v4:
>   - Added a fix for MT8192 Vgpu voltage constraints
>   - Changed constraints for MT8192 VSRAM-GPU to reflect the maximum
>     achievable voltage as per the actual vsram-vgpu relation constraint
> 
> Changes in v3:
>   - Changed MT8186 compatibles for new bindings
>   - Added min/max voltage overrides for vgpu/vsram_gpu on
>     mt8183-pumpkin and evb as suggested by Chen-Yu
>   - Cosmetic fixes for "arm64: dts: mediatek: mt8192: Add GPU nodes"
> 
> Changes in v2:
>   - Changed MT8186 to use only two power domains for the GPU.
> 
> We finally have working GPU DVFS on MediaTek SoCs.
> On Panfrost.
> For real.
> ...and the best part is that it's going upstream.
> 
> In order to get GPU DVFS working, it was necessary to satisfy a
> specific constraint (which is different, depending on the SoC)
> between two regulators: GPU VCORE and GPU SRAM.
> This was done through adding the mtk-regulator-coupler driver,
> which transparently manages the voltage relation between these
> two vregs, hence completely eliminating the need to manage these
> regulators in the Panfrost driver; this solves the long standing
> issue with devfreq+opp tables not supporting managing voltages
> for two regulators per opp entry out of the box, due to which
> we never got GPU DVFS on those SoCs, often locking them out to
> a low GPU frequency.
> 
> This changes. Right now!
> 
> Tested on MT8192, MT8195 Chromebooks.
> 

Applied, thanks!

> This series depends on [1].
> 
> [1]: https://lore.kernel.org/lkml/20230228102704.708150-1-angelogioacchino.delregno@collabora.com/
> 
> Alyssa Rosenzweig (2):
>    arm64: dts: mediatek: mt8192: Add GPU nodes
>    arm64: dts: mediatek: mt8192-asurada: Enable GPU
> 
> AngeloGioacchino Del Regno (16):
>    arm64: dts: mediatek: mt8183-kukui: Couple VGPU and VSRAM_GPU
>      regulators
>    arm64: dts: mediatek: mt8183-kukui: Override vgpu/vsram_gpu
>      constraints
>    arm64: dts: mediatek: mt8183: Remove second opp-microvolt entries from
>      gpu table
>    arm64: dts: mt8183-pumpkin: Couple VGPU and VSRAM_GPU regulators
>    arm64: dts: mediatek: mt8183-evb: Couple VGPU and VSRAM_GPU regulators
>    arm64: dts: mediatek: mt8183: Use mediatek,mt8183b-mali as GPU
>      compatible
>    arm64: dts: mediatek: mt8192: Add mfg_ref_sel clock to MFG0 domain
>    arm64: dts: mediatek: mt8192-asurada: Assign sram supply to MFG1 pd
>    arm64: dts: mediatek: mt8192-asurada: Fix voltage constraint for Vgpu
>    arm64: dts: mediatek: mt8192-asurada: Couple VGPU and VSRAM_OTHER
>      regulators
>    arm64: dts: mediatek: mt8195: Add mfg_core_tmp clock to MFG1 domain
>    arm64: dts: mt8195: Add panfrost node for Mali-G57 Valhall Natt GPU
>    arm64: dts: mediatek: mt8195-cherry: Enable Mali-G57 GPU
>    arm64: dts: mediatek: mt8186: Add GPU node
>    arm64: dts: mediatek: mt8183-pumpkin: Override vgpu/vsram_gpu
>      constraints
>    arm64: dts: mediatek: mt8183-evb: Override vgpu/vsram_gpu constraints
> 
> Nícolas F. R. A. Prado (1):
>    arm64: dts: mediatek: mt8192-asurada: Add MFG0 domain supply
> 
>   arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |  17 ++-
>   .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |  17 ++-
>   .../boot/dts/mediatek/mt8183-pumpkin.dts      |  17 ++-
>   arch/arm64/boot/dts/mediatek/mt8183.dtsi      |  34 ++---
>   arch/arm64/boot/dts/mediatek/mt8186.dtsi      |  17 +++
>   .../boot/dts/mediatek/mt8192-asurada.dtsi     |  24 +++-
>   arch/arm64/boot/dts/mediatek/mt8192.dtsi      | 116 +++++++++++++++++-
>   .../boot/dts/mediatek/mt8195-cherry.dtsi      |   5 +
>   arch/arm64/boot/dts/mediatek/mt8195.dtsi      |  95 +++++++++++++-
>   9 files changed, 315 insertions(+), 27 deletions(-)
>