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drm/doc: document front-buffer rendering

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Explain how to perform front-buffer rendering.

v2: apply Pekka's rewrite

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Simon Ser <contact@emersion.fr>
Link: https://lore.kernel.org/r/20250414085652.43904-1-contact@emersion.fr
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Pekka Paalanen 2025-04-14 08:56:56 +00:00 committed by Simon Ser
parent b389df0f6b
commit 9b33df36b4
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/drm_blend.c
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@ -75,6 +75,12 @@
* the currently visible vertical area of the &drm_crtc.
* FB_ID:
* Mode object ID of the &drm_framebuffer this plane should scan out.
*
* When a KMS client is performing front-buffer rendering, it should set
* FB_ID to the same front-buffer FB on each atomic commit. This implies
* to the driver that it needs to re-read the same FB again. Otherwise
* drivers which do not employ continuously repeated scanout cycles might
* not update the screen.
* CRTC_ID:
* Mode object ID of the &drm_crtc this plane should be connected to.
*