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Documentation: gpu: Mention the requirements for new properties 

New KMS properties come with a bunch of requirements to avoid each
driver from running their own, inconsistent, set of properties,
eventually leading to issues like property conflicts, inconsistencies
between drivers and semantics, etc.

Let's document what we expect.

Acked-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210720143544.571760-1-maxime@cerno.tech
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Maxime Ripard 2021-07-20 16:35:44 +02:00
parent 8626e63eee
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Documentation/gpu/drm-kms.rst
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@ -463,6 +463,35 @@ KMS Properties
This section of the documentation is primarily aimed at user-space developers.
For the driver APIs, see the other sections.
Requirements
------------
KMS drivers might need to add extra properties to support new features. Each
new property introduced in a driver needs to meet a few requirements, in
addition to the one mentioned above:
* It must be standardized, documenting:
* The full, exact, name string;
* If the property is an enum, all the valid value name strings;
* What values are accepted, and what these values mean;
* What the property does and how it can be used;
* How the property might interact with other, existing properties.
* It must provide a generic helper in the core code to register that
property on the object it attaches to.
* Its content must be decoded by the core and provided in the object's
associated state structure. That includes anything drivers might want
to precompute, like struct drm_clip_rect for planes.
* Its initial state must match the behavior prior to the property
introduction. This might be a fixed value matching what the hardware
does, or it may be inherited from the state the firmware left the
system in during boot.
* An IGT test must be submitted where reasonable.
Property Types and Blob Property Support
----------------------------------------