linux-kernel - [PATCH v2 0/2] drm/panthor: initial mt8196 support

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Message-ID: <20250913002155.1163908-1-olvaffe@gmail.com>
Date: Fri, 12 Sep 2025 17:21:53 -0700
From: Chia-I Wu <olvaffe@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH v2 0/2] 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/20250912-mt8196-gpufreq-v2-0-779a8a3729d9@collabora.com/
  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