drm/i915: clean up atomic plane check functions, v2.
By passing crtc_state to the check_plane functions a lot of duplicated code can be removed. There are still some transitional helper calls, they will be removed later. Changes since v1: - Revert state->visible changes. - Use plane->state->crtc instead of plane->crtc. - Use drm_atomic_get_existing_crtc_state. Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: NMatt Roper <matthew.d.roper@intel.com> Tested-by(IVB): Matt Roper <matthew.d.roper@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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