drm/i915: Simplify control flow in intel_atomic_check a bit.
- Unconditionally add plane states. Core helpers would have done this
in drm_atomic_helper_check_modeset, doing it once more won't cause
harm and is less fragile.
- Simplify the continue logic when disabling a pipe.
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1462779085-2458-1-git-send-email-daniel.vetter@ffwll.ch
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