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

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Message-ID: <2e6141f9-be76-41a4-a851-7ac1c31c101e@arm.com>
Date: Mon, 6 Oct 2025 10:54:48 +0100
From: Steven Price <steven.price@....com>
To: Chia-I Wu <olvaffe@...il.com>,
 Boris Brezillon <boris.brezillon@...labora.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: Re: [PATCH v2 0/2] drm/panthor: initial mt8196 support

On 13/09/2025 01:21, Chia-I Wu wrote:
> 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

Applied to drm-misc-next.

Thanks,
Steve

> 
> ---
> 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(-)
>