https://bugzilla.kernel.org/show_bug.cgi?id=201585
--- Comment #12 from Dan Acristinii (dan@acristinii.com) --- (In reply to Nicholas Kazlauskas from comment #10)
(In reply to Nicholas Kazlauskas from comment #9)
These patches should fix your issue:
I suppose I should mention that these are for amd-staging-drm-next, they probably won't cleanly apply on Linus' tree.
I would like to mention that revision 2 of the patch is incompatible with amd-staging-drm-next