Hi, It appears that HD Audio from AMD's generation Ryzen can't handle MSI. This leads to the bug that I reported here:
https://marc.info/?l=openbsd-bugs&m=151648196215922&w=2 Disabling MSI resolves the problem on my current system which is a Raven Ridge APU. I don't have the Summit Ridge hardware anymore to test that it is also resolved there, but the line is included in the diff (PCI_PRODUCT_AMD_AMD64_17_HDA). It seems likely that this diff will also fix HD Audio on Summit Ridge. However, testing would be welcome by anyone who has a first-gen Ryzen. I was slightly confused by the fact that so far it seems I've been the only one who reported this. Even searching online for such an issue in other OS didn't yield anything. However, the issue was there between 2 different Ryzen CPUs, 3 different motherboards, and at least 2 separate OpenBSD -current installations. And it was never there on any Intel-based setup, with otherwise same hardware and OpenBSD install. While there have been several reports of people using Ryzen with OpenBSD, they may not have used audio (that's my explanation for this at the moment). This diff was collaborative work with brynet@. ok? Index: azalia.c =================================================================== RCS file: /cvs/src/sys/dev/pci/azalia.c,v retrieving revision 1.244 diff -u -p -r1.244 azalia.c --- azalia.c 22 Apr 2018 10:02:13 -0000 1.244 +++ azalia.c 7 Jul 2018 18:26:20 -0000 @@ -517,6 +517,15 @@ azalia_pci_attach(struct device *parent, azalia_pci_write(sc->pc, sc->tag, ICH_PCI_MMC, reg); } + /* disable MSI for AMD Summit Ridge/Raven Ridge HD Audio */ + if (PCI_VENDOR(sc->pciid) == PCI_VENDOR_AMD) { + switch (PCI_PRODUCT(sc->pciid)) { + case PCI_PRODUCT_AMD_AMD64_17_HDA: + case PCI_PRODUCT_AMD_RAVENRIDGE_HDA: + pa->pa_flags &= ~PCI_FLAGS_MSI_ENABLED; + } + } + /* interrupt */ if (pci_intr_map_msi(pa, &ih) && pci_intr_map(pa, &ih)) { printf(": can't map interrupt\n");
