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@xxxxxxxxxxx> Signed-off-by: Javier Martinez Canillas <javierm@xxxxxxxxxx> Reviewed-by: Simon Ser <contact@xxxxxxxxxxx> Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Reviewed-by: Zack Rusin <zackr@xxxxxxxxxx> Acked-by: Sima Vetter <daniel.vetter@xxxxxxxx> --- Changes in v4: - Reference the &drm_plane_state.ignore_damage_clips and the damage helpers in the buffer damage TODO entry (Sima Vetter). Documentation/gpu/todo.rst | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index b62c7fa0c2bc..503d57c75215 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -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@xxxxxxxxxx> + +Level: Advanced + Outside DRM =========== -- 2.41.0
