Because this patch will likely end up fixing a lot of MST issues we either don't know about, or weren't able to figure out a fix for before, I definitely want to make sure this patch gets cc'd to stable as well. It doesn't apply cleanly to drm-misc-fixes, so here's a backported version that does.
Lyude Paul (1): drm/dp_mst: Kill the second sideband tx slot, save the world
drivers/gpu/drm/drm_dp_mst_topology.c | 122 +++++++------------------- include/drm/drm_dp_mst_helper.h | 18 +--- 2 files changed, 33 insertions(+), 107 deletions(-)