[PATCH v6 10/10] drm/i915: Implement proper fallback training for MST

For a while we actually haven't had any way of retraining MST links with fallback link parameters like we do with SST. While uncommon, certain setups such as my Caldigit TS3 + EVGA MST hub require this since otherwise, they end up getting stuck in an infinite MST retraining loop. MST retraining

[PATCH v6 10/10] drm/i915: Implement proper fallback training for MST

For a while we actually haven't had any way of retraining MST links with fallback link parameters like we do with SST. While uncommon, certain setups such as my Caldigit TS3 + EVGA MST hub require this since otherwise, they end up getting stuck in an infinite MST retraining loop. MST retraining