https://bugzilla.kernel.org/show_bug.cgi?id=215906 --- Comment #21 from Rolf Reintjes (lists.rolf@xxxxxxxxxxxx) --- (In reply to Michał Pecio from comment #20) > By a complete accident I found that VL805 has a known bug where it > overfetches transfer rings: > https://github.com/raspberrypi/linux/issues/4685 > > Rolf, there is a workaround for similar bug in Zhaoxin hardware which may > solve your IOMMU faults. > > Update to at least v6.6, or the latest v6.12 series if it's not a problem. > > Run the following (if using a USB keyboard put it all in a script): > rmmod xhci_pci > rmmod xhci_hcd > modprobe xhci_hcd quirks=0x200000000000 > modprobe xhci_pci > > Verify that it worked: > dmesg |grep quirks > [122123.422469] xhci_hcd 0000:08:00.0: hcc params 0x002841eb hci version > 0x100 quirks 0x0000200000000890 > > ^-- here > And see if it helps. Thank you very much. I just tried it and it works. The USB port runs fine. But what is actually done here? modprobe xhci_hcd quirks=0x200000000000 A setting is given to the driver when starting, but what does this setting mean? -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
