This fixes some annoying issues on the P50-P52 with displays not being detected if they aren't plugged in at boot, and sometimes even when they are plugged in at boot.
See: https://bugzilla.redhat.com/show_bug.cgi?id=1477182
Lyude Paul (2): drm/nouveau: Only write DP_MSTM_CTRL when needed drm/nouveau: Reset MST branching unit before enabling
drivers/gpu/drm/nouveau/dispnv50/disp.c | 65 ++++++++++++++++++------- 1 file changed, 48 insertions(+), 17 deletions(-)