https://bugzilla.kernel.org/show_bug.cgi?id=91861
--- Comment #15 from Mike S. michael.selig@fs.com.au --- Thanks again for the info.
I have been running the Radeon driver with the patch to limit the reference divider to 7 for a week now, and I can confirm that apart from that original incident, it has been very stable.
So thank you for the patch, and I hope it can get into 3.19.