Commit 9b33df36 authored by Pekka Paalanen's avatar Pekka Paalanen Committed by Simon Ser
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drm/doc: document front-buffer rendering 



Explain how to perform front-buffer rendering.

v2: apply Pekka's rewrite

Signed-off-by: default avatarPekka Paalanen <pekka.paalanen@collabora.com>
Signed-off-by: default avatarSimon Ser <contact@emersion.fr>
Reviewed-by: default avatarSimon Ser <contact@emersion.fr>
Link: https://lore.kernel.org/r/20250414085652.43904-1-contact@emersion.fr
parent b389df0f

drivers/gpu/drm/drm_blend.c

+6 −0
Original line number Diff line number Diff line
@@ -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.

 *