The issue is still there on amd-staging-drm-next branch.
The issue is gone with kernel parameter "iommu=off".
Created attachment 145984 [details]
kernel message with iommu
Created attachment 145985 [details]
kernel message without iommu
Created attachment 145993 [details] [review]
Does this patch fix the issue?
(In reply to Alex Deucher from comment #3)
> Created attachment 145993 [details] [review] [review]
> fix test
> Does this patch fix the issue?
No, the same issue persists.
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