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

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Message-Id: <20230301095523.428461-1-angelogioacchino.delregno@collabora.com>
Date:   Wed,  1 Mar 2023 10:55:04 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...il.com
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        angelogioacchino.delregno@...labora.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org
Subject: [PATCH v4 00/19] Enable GPU with DVFS support on MediaTek SoCs

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.

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(-)

-- 
2.39.2