linux-kernel - Re: [PATCH 1/2] dt-bindings: Add Apple SoC GPU

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Message-ID: <CAMT+MTRYybR=tFJrcUn43UK3iW-fqEH3rmCLUezq2eTrEK=nQw@mail.gmail.com>
Date: Wed, 11 Jun 2025 21:06:55 +0200
From: Sasha Finkelstein <fnkl.kernel@...il.com>
To: Sven Peter <sven@...nel.org>
Cc: asahi@...ts.linux.dev, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Simona Vetter <simona@...ll.ch>, 
	David Airlie <airlied@...il.com>, Neal Gompa <neal@...pa.dev>, Maxime Ripard <mripard@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Alyssa Rosenzweig <alyssa@...enzweig.io>, Janne Grunau <j@...nau.net>, 
	linux-arm-kernel@...ts.infradead.org, dri-devel@...ts.freedesktop.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: Add Apple SoC GPU

On Wed, 11 Jun 2025 at 20:44, Sven Peter <sven@...nel.org> wrote:
> > +      - description: Driver-opaque calibration blob
> > +      - description: Calibration blob
>
> Like Alyssa mentioned, this description also raises more questions than
> it answers for me. Do we know what these two blobs contain or why they
> are two separate blobs?

At some point in the gpu initialization process we give the firmware a bag
of pointers to various stuff it needs. HwCalA and HwCalB are separate
pointers, and they use separate gpu allocations. We do not fully know
what is in there, but we know what some of the fields do and how to
create the blobs based on data from apple device tree.