drm/doc: Improve docs for conn_state->best_encoder
It's mandatory and considered core state since ioctls rely on this working. Thanks to Laurent for pointing out this gap. v2: Clarify to "atomic drivers" only. Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Sean Paul <sean@poorly.run> Acked-by: Sean Paul <sean@poorly.run> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190506144629.5976-1-daniel.vetter@ffwll.ch
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@ -517,6 +517,10 @@ struct drm_connector_state {
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* Used by the atomic helpers to select the encoder, through the
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* &drm_connector_helper_funcs.atomic_best_encoder or
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* &drm_connector_helper_funcs.best_encoder callbacks.
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*
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* NOTE: Atomic drivers must fill this out (either themselves or through
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* helpers), for otherwise the GETCONNECTOR and GETENCODER IOCTLs will
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* not return correct data to userspace.
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*/
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struct drm_encoder *best_encoder;
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