drm/atomic: Add drm_atomic_helper_best_encoder()
Add (struct drm_connector_helper_funcs *)->best_encoder callback helper for connectors that support exactly 1 encoder, statically determined at driver init time. Signed-off-by: NNoralf Trønnes <noralf@tronnes.org> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1462982962-10530-6-git-send-email-noralf@tronnes.org
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