drm/i915: Add main atomic entrypoints (v2)
Add the top-level atomic entrypoints for check/commit. These won't get called yet; we still need to either enable the atomic ioctl or switch to using the non-transitional atomic helpers for legacy operations. v2: - Use plane->pipe rather than plane->possible_crtcs while ensuring that only a single CRTC is in use. Either way will work fine since i915 drm_plane's are always tied to a single CRTC, but plane->pipe is slightly more intuitive. (Ander) - Simplify crtc/connector checking logic. (Ander) Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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