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drm: Document requirements for driver-specific KMS props in new drivers

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When extending support for a driver-specific KMS property to additional
drivers, we should apply all the requirements for new properties and
make sure the semantics are the same and documented.

v2: devs of the driver which introduced property shall help and ack

Signed-off-by: Sebastian Wick <sebastian.wick@redhat.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240410122008.38207-1-sebastian.wick@redhat.com
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Sebastian Wick 2024-04-10 14:20:06 +02:00 committed by Maxime Ripard
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Documentation/gpu/drm-kms.rst
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@ -496,6 +496,13 @@ addition to the one mentioned above:
* An IGT test must be submitted where reasonable.
For historical reasons, non-standard, driver-specific properties exist. If a KMS
driver wants to add support for one of those properties, the requirements for
new properties apply where possible. Additionally, the documented behavior must
match the de facto semantics of the existing property to ensure compatibility.
Developers of the driver that first added the property should help with those
tasks and must ACK the documented behavior if possible.
Property Types and Blob Property Support
----------------------------------------