Re: broken EHCI USB on AMD chipset?

On Tue, Nov 28, 2017 at 08:03:05PM -0800, Paul B. Henson wrote:

> The EHCI ports seem to work fine under Linux, including the LTE modem
> when attached to them, so this seems to be an issue with openbsd, not
> faulty hardware per se.

I tested FreeBSD on this box as well, it detected the EHCI ports as:

usbus1: EHCI version 1.0
usbus1 on ehci0
usbus1: 480Mbps High Speed USB v2.0
usbus2: EHCI version 1.0
usbus2 on ehci1
usbus2: 480Mbps High Speed USB v2.0
ugen1.1: <AMD EHCI root HUB> at usbus1
ugen2.1: <AMD EHCI root HUB> at usbus2
uhub0: <AMD EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
<AMD EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus2
ugen1.2: <vendor 0x0438 product 0x7900> at usbus1
uhub3: <vendor 0x0438 product 0x7900, class 9/0, rev 2.00/0.18, addr 2>
on usb
us1
ugen2.2: <vendor 0x0438 product 0x7900> at usbus2
uhub4: <vendor 0x0438 product 0x7900, class 9/0, rev 2.00/0.18, addr 2>
on usb
us2

As far as I can tell the ports work ok under FreeBSD, detecting hot plug
and removal of devices, and the interrupt count from vmstat -i increases
when doing so. FreeBSD doesn't support the Sierra Wireless card I have
but I'm guessing it would work.

So it just seems to be an issue with OpenBSD and this board or USB
chipset or something. I turned on debugging in the ehci and uhub code,
but when I plug something in nothing whatsoever happens, so that wasn't
very useful. Any suggestions on other debugging to enable or any other
approach to figure out what's going on here?

Thanks...