[PATCH v2 0/3] Add initial GPU support for CIX Sky1

[Cunyuan Liu <cunyuan.liu@cixtech.com>]

This series adds initial support for the Mali GPU on CIX Sky1 and
enables it on the Radxa Orion O6 board.

The GPU requires an external reset before the driver first accesses
the hardware. Add optional reset support to Panthor to perform this
reset during initialization.

This initial version keeps the PM firmware default clock settings and
skips devfreq. It does not read OPPs or request a performance level.
The firmware sets the default GPU frequency to 1 GHz. No devfreq
governor or GPU cooling device is registered.

Configure the system-level cache before L2 power-on using the settings
from the working CIX Sky1 driver. On Sky1, devices on the MMHUB bus
cannot access the system-level cache, so buffers shared between the GPU
and MMHUB devices require a specific system-level cache policy. Without
this configuration, the GPU display output is corrupted.

The series contains three patches:
[1/3] dt-bindings: gpu: Add CIX Sky1 Mali support
[2/3] drm/panthor: Add initial support for CIX Sky1
[3/3] arm64: dts: cix: Add GPU support for Sky1 Orion O6


Tested on Radxa Orion O6:
  - Offscreen rendering with pixel readback
  - kmscube
  - glmark2 at 1080p
  - Runtime suspend and resume with a retained EGL context
  - Reset-worker operations
  - Module unload and reload


Changes in v2:
  - Use devm_reset_control_get_optional_exclusive() unconditionally,
    remove the redundant NULL check before reset_control_reset(), and
    drop needs_external_reset, as suggested by Philipp Zabel.
  - Add Conor Dooley's Acked-by to the unchanged binding patch.

Link to v1:
https://lore.kernel.org/all/20261106104735.1651267-1-cunyuan.liu@cixtech.com/


Best regards,
Cunyuan

Cunyuan Liu (3):
  dt-bindings: gpu: Add CIX Sky1 Mali support
  drm/panthor: Add initial support for CIX Sky1
  arm64: dts: cix: Add GPU support for Sky1 Orion O6

 .../bindings/gpu/arm,mali-valhall-csf.yaml    | 51 +++++++++++++++++++
 arch/arm64/boot/dts/cix/sky1-orion-o6.dts     |  4 ++
 arch/arm64/boot/dts/cix/sky1.dtsi             | 16 ++++++
 drivers/gpu/drm/panthor/panthor_devfreq.c     | 11 +++-
 drivers/gpu/drm/panthor/panthor_device.c      | 13 +++++
 drivers/gpu/drm/panthor/panthor_device.h      | 19 +++++++
 drivers/gpu/drm/panthor/panthor_drv.c         | 14 +++++
 drivers/gpu/drm/panthor/panthor_gpu.c         | 14 +++++
 drivers/gpu/drm/panthor/panthor_gpu_regs.h    |  2 +
 9 files changed, 143 insertions(+), 1 deletion(-)


base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
-- 
2.53.0