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

[Chen-Yu Tsai]

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"

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