drm/i915: Implement Link Rate fallback on Link training failure ...first and then call mode_valid (Jani Nikula) the helper intel_dp_link_rate_index (Jani Nikula) ...within intel_dp_start_link_train (Jani Nikula) ...status to drm core (Daniel Vetter, Jani Nikula) (Jani Nikula) ...property to BAd unconditionally (Jani Nikula) to indicate same thing (Jani Nikula) * Squashed a few patches (Jani Nikula) Cc: Jani Nikula <jani.nikula@linux.intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com>