https://bugzilla.kernel.org/show_bug.cgi?id=205169
--- Comment #10 from Pierre-Eric Pelloux-Prayer (pierre-eric.pelloux-prayer@amd.com) --- "git bisect" identifies this commit as the problematic one: 617089d5837a ("drm/amd/display: revert wait in pipelock").
Reverting this commit on top of amd-staging-drm-next seems to work fine.