On Thu, Feb 23, 2023 at 9:43 PM AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> wrote: > > 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/20230223133440.80941-1-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 Tested-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx> on MT8183 Juniper, MT8192 Hayato, MT8195 Tomato, MT8186 not-yet-upstreamed device.
