UAPI Changes: None Cross-subsystem Changes: None Core Changes: Fixed some issues introduced by commit cd82d82cbc04 ("drm/dp_mst: Add branch bandwidth validation to MST atomic check"), which caused the DP MST helpers to incorrectly reject display configurations in drm_dp_mst_atomic_check() as a result of miscalculating the available bandwidth. Additionally, another issue that was required for this to work was fixed where we would reject display configurations because we would accidentally expose MST connectors to userspace before having probed their available bandwidth. Driver Changes: None