https://bugzilla.kernel.org/show_bug.cgi?id=204241
--- Comment #4 from Andrey Grodzovsky (andrey.grodzovsky@amd.com) --- I tried to reproduce it with a kernel which is just a few commits different then this one - https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next
I tried with X enabled and in FB console. Was able to suspend and resume with no errors.
I would suggest to build your kernel from the branch above and see if it helps. Also please post your FW info using this command cat /sys/kernel/debug/dri/0/amdgpu_firmware_info