drm/i915/dp: Add debugfs entry to force link training failure
Add a connector debugfs entry to force a failure during the following 1-2 link training. The entry will auto-reset after the specified link training events are complete. v2: Add the entry from intel_dp_link_training.c (Jani) v3: Lock connection_mutex only for the required intel_dp state. (Ville) Cc: Jani Nikula <jani.nikula@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240610164933.2947366-20-imre.deak@intel.com
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