mbox series

[v2,00/16] Enable GPU with DVFS support on MediaTek SoCs

Message ID 20230223134345.82625-1-angelogioacchino.delregno@collabora.com
Headers
Series Enable GPU with DVFS support on MediaTek SoCs |

Message

AngeloGioacchino Del Regno Feb. 23, 2023, 1:43 p.m. UTC 
  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@collabora.com/

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      |  17 +++
 .../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, 304 insertions(+), 26 deletions(-)

Comments

Chen-Yu Tsai Feb. 24, 2023, 9:41 a.m. UTC | #1 
On Thu, Feb 23, 2023 at 9:43 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com> 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@collabora.com/
>
> 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@chromium.org>

on MT8183 Juniper, MT8192 Hayato, MT8195 Tomato, MT8186 not-yet-upstreamed
device.