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SubjectRe: Regression causes a hang on boot with a Comtrol PCI card
On Tue, Apr 2, 2019 at 9:29 AM Alan Stern <stern@rowland.harvard.edu> wrote:
> Most likely the problem occurs somewhere inside
> quirk_usb_handoff_xhci(). Can Jesse add debugging statements to that
> routine in order to pin down exactly where the problem lies?

Alan,

I added debug statements to quirk_usb_early_handoff, quirk_usb_disable_ehci &
ehci_bios_handoff. The box hangs right before calling:

pci_write_config_byte(pdev, offset + 3, 1);

which is in ehci_bios_handoff:

[ 10.698240] DEBUG: Passed quirk_usb_early_handoff 1300
[ 10.704271] DEBUG: Passed quirk_usb_early_handoff 1308
[ 10.710206] DEBUG: Passed quirk_usb_disable_ehci 939
[ 10.715949] DEBUG: Passed quirk_usb_disable_ehci 945
[ 10.721685] DEBUG: Passed quirk_usb_disable_ehci 950
[ 10.727423] DEBUG: Passed quirk_usb_disable_ehci 958
[ 10.733160] DEBUG: Passed quirk_usb_disable_ehci 964
[ 10.738897] DEBUG: Passed quirk_usb_disable_ehci 968
[ 10.744633] DEBUG: Passed ehci_bios_handoff 849
[ 10.749884] DEBUG: Passed ehci_bios_handoff 884

I have attached the debug output, and my modified pci-quirks.c file
to the bug report, let me know what else I can do to help.

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