drm/panthor: initial mt8196 support

MediaTek MT8196 has Mali-G925-Immortalis, for which panthor gained support recently. But the soc also requires custom ASN hash to be enabled. This series introduces panthor_soc_data for per-soc data and uses it to enable custom ASN hash on MT8196.

The clk/regulator provider on MT8196 is GPUEB, whose driver[1] needs to be cleaned up and upstreamed separately.

This initial support also lacks support for some hw configs. On some configs, panthor is expected to query a mask from efuse to mask out unavailable shader cores from ptdev->gpu_info.shader_present. This requires extending panthor_soc_data with a callback to read the mask.

This is an RFC because the dependent drivers are not ready yet. But I would like to gather opinions on having panthor_soc_data for soc-specific data and having CONFIG_DRM_PANTHOR_SOC_MT8196 for soc-specific code.

[1] https://gitlab.freedesktop.org/olv/kernel/-/commit/170d5fc90f817dc90bde54b32872c59cf5c77779

---
v2:

- drop RFC as this series works with the downstream GPUEB driver, and should work with Nicolas's GPUEB driver posted to
https://lore.kernel.org/lkml/[email protected]/
with no change.
- remove CONFIG_DRM_PANTHOR_SOC_MT8196 and panthor_soc*.[ch], as this initial support is just about ASN hash.

Chia-I Wu (2):
dt-bindings: gpu: mali-valhall-csf: add MediaTek MT8196 compatible drm/panthor: add custom ASN_HASH support for mt8196

 .../bindings/gpu/arm,mali-valhall-csf.yaml    |  1 +
 drivers/gpu/drm/panthor/panthor_device.c      |  2 ++
 drivers/gpu/drm/panthor/panthor_device.h      | 14 +++++++++++
 drivers/gpu/drm/panthor/panthor_drv.c         |  6 +++++
 drivers/gpu/drm/panthor/panthor_gpu.c         | 25 ++++++++++++++++++-
 drivers/gpu/drm/panthor/panthor_regs.h        |  4 +++
 6 files changed, 51 insertions(+), 1 deletion(-)

2.51.0.384.g4c02a37b29-goog