https://bugzilla.kernel.org/show_bug.cgi?id=199959
--- Comment #22 from Christian König (christian.koenig@amd.com) --- Your debugging efforts are better than mine.
Please provide the output of "sudo setpci -s 65:00.0 ECAP15.l ECAP15+4.l ECAP15+8.l" once before suspend and once after suspend without any changes (e.g. when the problem happens).