Problems with USB devices connecting to UHCI instead of EHCI

[Kevin Oberman]

> From: Hans Petter Selasky <hselasky at c2i.net>
> Date: Sun, 11 Mar 2007 19:25:14 +0100
> 
> On Sunday 11 March 2007 02:04, Kevin Oberman wrote:
> > If I load umass after plugging in a disk or flash fob, it will be
> > connected as a UHCI device. If I load umass and then connect the device,
> > it is properly connected as EHCI. When connected as a UHCI device, it is
> > too slow to be useful.
> >
> > Looks like a race condition as the EHCI is the last USB device probed. I
> > suspect that the disk is already connected to a UHCI device before an
> > EHCI device is found.
> >
> > uhci0: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-A> port
> > 0x1800-0x181f irq 11 at device 29.0 on pci0 uhci0: [GIANT-LOCKED]
> > uhci0: [ITHREAD]
> > usb0: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-A> on uhci0
> > usb0: USB revision 1.0
> > uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
> > uhub0: 2 ports with 2 removable, self powered
> > uhci1: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-B> port
> > 0x1820-0x183f irq 11 at device 29.1 on pci0 uhci1: [GIANT-LOCKED]
> > uhci1: [ITHREAD]
> > usb1: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-B> on uhci1
> > usb1: USB revision 1.0
> > uhub1: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
> > uhub1: 2 ports with 2 removable, self powered
> > uhci2: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-C> port
> > 0x1840-0x185f irq 11 at device 29.2 on pci0 uhci2: [GIANT-LOCKED]
> > uhci2: [ITHREAD]
> > usb2: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-C> on uhci2
> > usb2: USB revision 1.0
> > uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
> > uhub2: 2 ports with 2 removable, self powered
> > uhci3: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-D> port
> > 0x1860-0x187f irq 11 at device 29.3 on pci0 uhci3: [GIANT-LOCKED]
> > uhci3: [ITHREAD]
> > usb3: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-D> on uhci3
> > usb3: USB revision 1.0
> > uhub3: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb3
> > uhub3: 2 ports with 2 removable, self powered
> > ehci0: <Intel 82801FB (ICH6) USB 2.0 controller> mem 0xb0000000-0xb00003ff
> > irq 11 at device 29.7 on pci0 ehci0: [GIANT-LOCKED]
> > ehci0: [ITHREAD]
> > usb4: EHCI version 1.0
> > usb4: companion controllers, 2 ports each: usb0 usb1 usb2 usb3
> > usb4: <Intel 82801FB (ICH6) USB 2.0 controller> on ehci0
> > usb4: USB revision 2.0
> > uhub4: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb4
> > uhub4: 8 ports with 8 removable, self powered
> >
> > Any idea if this is fixable? Not a huge problem, but an annoying
> > one. Will the new USB system (hopefully coming soon) deal with this?
> 
> It might have something to do with the probe order. Did you try the new USB 
> stack. I recommend you install it on 6-stable, because on 7-current it needs 
> some small patches to compile, due to some changes in the kernel API lately.

Yes, I suspect the probe order is significant, but the only system I use
USB devices on is my laptop and I really don't want to roll it back to
stable. 

I can continue to work around it until you have a set of current patches
for me to try. I'm really anxious to try out the new stack as I am
hoping it will make USB behave better in terma of power management on my
laptop. That's why i don't build USB into my kernel, but just load it
when I need it.

I don't normally read usb@, so I may drop you a note in a couple of
weeks to see if the stack has been updated for current.

Thanks!
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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