[Bug 238652] [USB] Timeout errors on boot with Intel ATOM cpus

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238652

            Bug ID: 238652
           Summary: [USB] Timeout errors on boot with Intel ATOM cpus
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: nicolas.masse at stormshield.eu

When booting a device using an Intel E3845 cpu, we see the following usb errors
in the dmesg:
[6] usbus1: port reset timeout
[6] uhub_reattach_port: port 1 reset failed, error=USB_ERR_TIMEOUT
[6] uhub_reattach_port: device problem (USB_ERR_TIMEOUT), disabling port 1

Although we receive those errors, usb ports are working as expexted.
In fact those errors comes from the EHCI driver, but the ports seems to be
using the XHCI one.

My guess is that the system try to attach both driver to the same device, since
the cpu does expose both interfaces (XHCI should be preferred, EHCI is exposed
mainly for compatibility reasons)

In order to check that I tried to force the XHCI mode in the BIOS, and this 
made those errors disappears (the problem here being that we can't access the
BIOS from our customers), which seems to confirm my supposition.

How do you think we could address the problem?

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