drm: Introduce a drm_crtc_commit_wait helper
There's currently four users of the same logic to wait for a commit to be flipped: three for the CRTCs, connectors and planes in drm_atomic_helper_wait_for_dependencies, and one in vc4. Let's consolidate this a bit to avoid any code duplication. Suggested-by:Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20210111084401.117152-1-maxime@cerno.tech
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