[PATCH v2 0/5] powervr: MT8173 GPU support

[Icenowy Zheng]

在 2026-03-25三的 16:08 +0800，Chen-Yu Tsai写道：
> On Wed, Mar 25, 2026 at 4:04 PM Icenowy Zheng <uwu at icenowy.me> wrote:
> > 
> > 在 2026-03-25三的 15:19 +0800，Chen-Yu Tsai写道：
> > > Hi everyone,
> > > 
> > > This is v2 of my MT8173 PowerVR GPU support series.
> > > 
> > > Changes since v1:
> > > - Adapted to changed DT bindings
> > > - Dropped driver change
> > > - Use same power domain for "a" and "b" GPU power domains
> > > 
> > > This update was requested by Icenowy.
> > > 
> > > 
> > > This series enables the PowerVR GPU found in the MT8173 SoC,
> > > found in
> > > some Chromebooks.
> > > 
> > > This version is different from the initial powervr driver
> > > submission
> > > [1]
> > > in that it splits out the GPU glue layer support out of the
> > > powervr
> > > driver and into a separate clock and power domain driver. The
> > > glue
> > > code
> > > is otherwise the same, and also the same as found in the ChromeOS
> > > kernels, with some extra comments and macro names added where
> > > possible.
> > > 
> > > Patch 1 adds a binding for the glue layer, called mfgtop. The
> > > glue
> > > layer
> > > contains clock and power controls for the GPU.
> > > 
> > > Patch 2 adds a driver for the glue layer.
> > > 
> > > Patch 3 adds an entry for the MT8173 GPU and 6XT series to the
> > > PowerVR
> > > binding.
> > > 
> > > Patch 4 adds an entry for the PowerVR 6XT series GPU to the
> > > driver.
> > > 
> > > Patch 5 corrects the clock for the GPU (called MFG) power domain.
> > > 
> > > Patch 6 adds device nodes for the GPU and glue layer to the
> > > MT8173
> > > dtsi
> > > file.
> > > 
> > > Patch 2 and 6 depend on patch 1 to build. I suppose some common
> > > immutable tree would be needed from the MediaTek maintainers.
> > > 
> > > The kernel driver successfully probes the hardware and loads the
> > > "rogue_4.40.2.51_v1.fw" firmware provided by Imagination
> > > Technologies
> > > [2].
> > > Userspace was tested with Mesa 24.0.8 from Debian Trixie rebuilt
> > > with
> > > the powervr vulkan driver enabled. `vulkaninfo` gives some
> > > information
> > > about the GPU (attached at the end), but running the `triangle`
> > > example
> > > from the Sascha Willems demos [3] with -DUSE_D2D_WSI=ON as
> > > recommended [4]
> > > failed with:
> > > 
> > >     Can't find a display and a display mode!
> > 
> > I think when using D2D the demos want width and height to be
> > explicitly
> > specified, otherwise it seems to hardcode 1280x720.
> > 
> > If you're using an elm, could you try to add `-w 1920 -h 1080` or
> > for
> > hana `-w 1366 -h 768` ?
> 
> I only did the basic `vulkaninfo` test this time around. To do
> anything
> interesting probably requires the Mesa 26.1 release.
> 
>     PVR_I_WANT_A_BROKEN_VULKAN_DRIVER=1 \
>         vkmark --winsys kms -D b81f54f8568deb0fb70a6a1ed845b65d
> 
> just reports "Error: Device specified by uuid is not available"

I am very sorry to tell you that, when I run Sascha's demo with Mesa
main, I got GPU lost immediately...

```
[  441.509433] powervr 13000000.gpu: [drm] *ERROR* GPU device lost
```

Icenowy

> 
> This is with Mesa 26.0.2 packages from Debian testing. At least now
> have the powervr vulkan driver enabled by default, so I don't have
> to rebuild the packages again.
> 
> 
> ChenYu
> 
> > Thanks
> > Icenowy
> > 
> > > 
> > > Same program worked correctly on a BeaglePlay and displayed a
> > > color
> > > gradient triangle. Not sure what went wrong here.
> > > 
> > > Anyway, please have a look and test.
> > > 
> > > 
> > > Thanks
> > > ChenYu
> > > 
> > > [1]
> > > https://lore.kernel.org/dri-devel/20220815165156.118212-2-sarah.walker@imgtec.com/
> > > [2]
> > > https://gitlab.freedesktop.org/imagination/linux-firmware/-/tree/powervr
> > > [3] https://github.com/SaschaWillems/Vulkan
> > > [4]
> > > https://lore.kernel.org/dri-devel/f2b2671e-5acc-4dec-9c2e-3c9cd2e1f19e@imgtec.com/
> > > 
> > > Chen-Yu Tsai (5):
> > >   dt-bindings: clock: mediatek: Add mt8173 mfgtop
> > >   clk: mediatek: Add mt8173-mfgtop driver
> > >   dt-bindings: gpu: powervr-rogue: Add MediaTek MT8173 GPU
> > >   arm64: dts: mediatek: mt8173: Fix MFG_ASYNC power domain clock
> > >   arm64: dts: mediatek: mt8173: Add GPU device nodes
> > > 
> > >  .../clock/mediatek,mt8173-mfgtop.yaml         |  70 +++++
> > >  .../bindings/gpu/img,powervr-rogue.yaml       |   1 +
> > >  arch/arm64/boot/dts/mediatek/mt8173.dtsi      |  33 ++-
> > >  drivers/clk/mediatek/Kconfig                  |   9 +
> > >  drivers/clk/mediatek/Makefile                 |   1 +
> > >  drivers/clk/mediatek/clk-mt8173-mfgtop.c      | 243
> > > ++++++++++++++++++
> > >  include/dt-bindings/clock/mt8173-clk.h        |   7 +
> > >  7 files changed, 363 insertions(+), 1 deletion(-)
> > >  create mode 100644
> > > Documentation/devicetree/bindings/clock/mediatek,mt8173-
> > > mfgtop.yaml
> > >  create mode 100644 drivers/clk/mediatek/clk-mt8173-mfgtop.c