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/20230208103709.116896-1-angelogioacchino.delregno@xxxxxxxxxxxxx/ Alyssa Rosenzweig (2): arm64: dts: mediatek: mt8192: Add GPU nodes arm64: dts: mediatek: mt8192-asurada: Enable GPU AngeloGioacchino Del Regno (13): 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: 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 Nícolas F. R. A. Prado (1): arm64: dts: mediatek: mt8192-asurada: Add MFG0 domain supply arch/arm64/boot/dts/mediatek/mt8183-evb.dts | 11 +- .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 17 ++- .../boot/dts/mediatek/mt8183-pumpkin.dts | 11 +- arch/arm64/boot/dts/mediatek/mt8183.dtsi | 34 ++--- arch/arm64/boot/dts/mediatek/mt8186.dtsi | 18 +++ .../boot/dts/mediatek/mt8192-asurada.dtsi | 22 ++++ arch/arm64/boot/dts/mediatek/mt8192.dtsi | 118 +++++++++++++++++- .../boot/dts/mediatek/mt8195-cherry.dtsi | 5 + arch/arm64/boot/dts/mediatek/mt8195.dtsi | 95 +++++++++++++- 9 files changed, 305 insertions(+), 26 deletions(-) -- 2.39.1
