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

[AngeloGioacchino Del Regno]

Il 02/03/23 10:36, Matthias Brugger ha scritto:
> Series looks good but from my understanding has a dependency on:
> [PATCH v4 00/12] Panfrost: Improve and add MediaTek SoCs support 
> (https://lore.kernel.org/linux-mediatek/20230228102610.707605-1-angelogioacchino.delregno@xxxxxxxxxxxxx/)
>
> Did I get that right?

Yes you got it right - without the mentioned series, this one will do nothing
at all (and will also fail binding checks, as the bindings are introduced in
that other series).

Cheers,
Angelo

> Regards,
> Matthias
>
> 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.
> >
> > This series depends on [1].
> >
> > [1]: 
> > https://lore.kernel.org/lkml/20230228102704.708150-1-angelogioacchino.delregno@xxxxxxxxxxxxx/
> >
> > 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(-)

--
AngeloGioacchino Del Regno
Software Engineer

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