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Add kernel-doc documentation describing the Intel DP link training recovery state machine and the sequence of automatic retraining, fallback selection, and userspace notification. v2: - Rebase on dedicated intel-display documentation change. - Remove unnecessary indent in section bodies. (Jani) - Add recovery flowcharts. (Jani) Cc: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Mika Kahola <mika.kahola@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260601093836.3057345-23-imre.deak@intel.com