https://bugs.freedesktop.org/show_bug.cgi?id=106225
--- Comment #27 from Jerry Zuo Jerry.Zuo@amd.com --- The issue could get reproduced on 4.16.3, but not on 4.16-rc7.
I've verified the commit a0f282dcdb1775cbcc0a151570fc01c0aae5ca0f (current top) on amd-staging-drm-next without seeing the issue on Raven by having 20 times bootup.
Please give a try on that commit at your setup. Thanks.