drm: rework description of primary and cursor planes
The previous wording could be understood by user-space evelopers as "a primary/cursor plane is only compatible with a single CRTC" [1]. Reword the planes description to make it clear the DRM-internal drm_crtc.primary and drm_crtc.cursor planes are for legacy uAPI. [1]: https://github.com/swaywm/wlroots/pull/2333#discussion_r456788057 Signed-off-by:Simon Ser <contact@emersion.fr> Reviewed-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by:
Pekka Paalanen <pekka.paalanen@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201211184634.74534-1-contact@emersion.fr
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