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drm/todo: Add entry about implementing buffer age for damage tracking

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Currently, only damage tracking for frame damage is supported. If a driver
needs to do buffer damage (e.g: the framebuffer attached to plane's state
has changed since the last page-flip), the damage helpers just fallback to
a full plane update.

Add en entry in the TODO about implementing buffer age or any other damage
accumulation algorithm for buffer damage handling.

Suggested-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Zack Rusin <zackr@vmware.com>
Acked-by: Sima Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20231123221315.3579454-6-javierm@redhat.com
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Javier Martinez Canillas 2023-11-23 23:13:04 +01:00
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Documentation/gpu/todo.rst
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@ -782,6 +782,29 @@ Contact: Hans de Goede
Level: Advanced
Buffer age or other damage accumulation algorithm for buffer damage
===================================================================
Drivers that do per-buffer uploads, need a buffer damage handling (rather than
frame damage like drivers that do per-plane or per-CRTC uploads), but there is
no support to get the buffer age or any other damage accumulation algorithm.
For this reason, the damage helpers just fallback to a full plane update if the
framebuffer attached to a plane has changed since the last page-flip. Drivers
set &drm_plane_state.ignore_damage_clips to true as indication to
drm_atomic_helper_damage_iter_init() and drm_atomic_helper_damage_iter_next()
helpers that the damage clips should be ignored.
This should be improved to get damage tracking properly working on drivers that
do per-buffer uploads.
More information about damage tracking and references to learning materials can
be found in :ref:`damage_tracking_properties`.
Contact: Javier Martinez Canillas <javierm@redhat.com>
Level: Advanced
Outside DRM
===========