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SubjectRe: [linux-usb-devel] Re: USB EHCI Problem with Low Speed Devices on kernel 2.6.11+
On Sat, 27 Aug 2005, Pete Zaitcev wrote:

> On Sat, 27 Aug 2005 15:43:11 +0200, Dominik Wezel <dio@qwasartech.com> wrote:
>
> Forwarding to linux-usb-devel with comments.
>
> > Kernel
> > ======
> > - 2.6.8, 2.6.11.10 and 2.6.12.4, all show same problem
>
> > Problem
> > =======
> > When turning on the laptop and during POST and GrUB loading, all ports
> > on the hub are enabled. During the USB initialization phase, when the
> > hub is detected, shortly all ports become disabled, then turn on again
> > (uhci_hcd detects the lo-speed ports). Upon initialization of ehci_hcd
> > however, the ports are disconnected again (for good):
> >
> > ---8<----
> > Aug 27 14:29:50 solaris kernel: ehci_hcd 0000:00:1d.7: USB 2.0
> > initialized, EHCI 1.00, driver 10 Dec 2004
> > Aug 27 14:29:50 solaris kernel: hub 4-0:1.0: USB hub found
> > Aug 27 14:29:50 solaris kernel: hub 4-0:1.0: 6 ports detected
> > Aug 27 14:29:50 solaris kernel: usb 2-1: USB disconnect, address 2
> > Aug 27 14:29:50 solaris kernel: usb 2-1.5: USB disconnect, address 3
> > Aug 27 14:29:50 solaris kernel: usb 2-1.6: USB disconnect, address 4
> > ---8<----
> >
> > Addresses 2, 3 and 4 are a keyboard, mouse and palm sync cable respectively.
> >
> > and afterwards the log becomes cluttered with:
> >
> > ---8<----
> > Aug 27 14:30:31 solaris kernel: usb 4-3: new high speed USB device using
> > ehci_hcd and address 79
> > Aug 27 14:30:31 solaris kernel: usb 4-3: device not accepting address
> > 79, error -71
> > Aug 27 14:30:32 solaris kernel: usb 4-3: new high speed USB device using
> > ehci_hcd and address 81
> > Aug 27 14:30:32 solaris kernel: usb 4-3: device not accepting address
> > 81, error -71
> > Aug 27 14:30:33 solaris kernel: usb 4-3: new high speed USB device using
> > ehci_hcd and address 86
> > Aug 27 14:30:34 solaris kernel: usb 4-3: device not accepting address
> > 86, error -71
> > Aug 27 14:30:34 solaris kernel: usb 4-3: new high speed USB device using
> > ehci_hcd and address 89
> > Aug 27 14:30:35 solaris kernel: usb 4-3: device not accepting address
> > 89, error -71
> > Aug 27 14:30:35 solaris kernel: usb 4-3: new high speed USB device using
> > ehci_hcd and address 90
> > Aug 27 14:30:35 solaris kernel: usb 4-3: device not accepting address
> > 90, error -71
> > ---8<----
> >
> > first address to be assigned was 30 in all logs, but the number raises
> > mostly in increments of 2 till about 120, then restarts with 12.
> >
> > Interestlingly, the keyboard and mouse have been detected immediately
> > before the intialization of ehcihcd:
> >
> > ---8<---
> > Aug 27 14:29:50 solaris kernel: uhci_hcd 0000:00:1d.2: Intel Corp.
> > 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3
> > Aug 27 14:29:50 solaris kernel: PCI: Setting latency timer of device
> > 0000:00:1d.2 to 64
> > Aug 27 14:29:50 solaris kernel: uhci_hcd 0000:00:1d.2: irq 11, io base
> > 0x1840
> > Aug 27 14:29:50 solaris kernel: uhci_hcd 0000:00:1d.2: new USB bus
> > registered, assigned bus number 3
> > Aug 27 14:29:50 solaris kernel: hub 3-0:1.0: USB hub found
> > Aug 27 14:29:50 solaris kernel: hub 3-0:1.0: 2 ports detected
> > /* These are the 2 ports on the laptop */
> > Aug 27 14:29:50 solaris kernel: usb 2-1: new full speed USB device using
> > uhci_hcd and address 2
> > Aug 27 14:29:50 solaris kernel: hub 2-1:1.0: USB hub found
> > Aug 27 14:29:50 solaris kernel: hub 2-1:1.0: 7 ports detected
> > /* These are the 7 ports of the external hub */
> > Aug 27 14:29:50 solaris kernel: usb 2-1.5: new low speed USB device
> > using uhci_hcd and address 3
> > Aug 27 14:29:50 solaris kernel: usb 2-1.6: new low speed USB device
> > using uhci_hcd and address 4
> > Aug 27 14:29:50 solaris kernel: usbcore: registered new driver hiddev
> > Aug 27 14:29:50 solaris kernel: input: USB HID v1.10 Mouse [Logitech
> > Trackball] on usb-0000:00:1d.1-1.5
> > Aug 27 14:29:50 solaris kernel: input: USB HID v1.10 Keyboard [CHICONY
> > USB Keyboard] on usb-0000:00:1d.1-1.6
> > Aug 27 14:29:50 solaris kernel: input,hiddev96: USB HID v1.10 Device
> > [CHICONY USB Keyboard] on usb-0000:00:1d.1-1.6
> > Aug 27 14:29:50 solaris kernel: usbcore: registered new driver usbhid
> > Aug 27 14:29:50 solaris kernel: drivers/usb/input/hid-core.c: v2.0:USB
> > HID core driver
> > ---8<---
> >
> > which means the ehci_hcd has afterwards superseded uhci_hcd.
> >
> > Even more interestingly: in about 5% of the boot cases, ehci_hcd manages
> > to detect the ports correctly (or at least doesn't interfere with uhci).
>
> Curious.
>
> > Measures taken
> > ==============
> > I've found an article suggesting to
> > echo Y > /sys/module/usbcore/parameters/old_scheme_first
>
> Very funny.
>
> > ---
> > I've also found articles suggesting to throw away the hub and get
> > another one, which of course I can't take plain seriously, because now I
> > know the problem of this hub, and I'm not going to change it for a hub
> > whose problem I even don't know yet... =;)
>
> Borrow one for testing.
>
> Also, plug Palm directly into computer. Surely it has more than one
> USB connector.
>
> > Measures not taken
> > ==================
> > I didn't test the hub on Microsoft Windows, because I assume that
> > wouldn't add to the solution space, since the problem is clearly located
> > in the uhci_hcd vs. ehci_hcd domain of the linux kernel, as the hub is
> > fully functional (within the lo speed scope) when used with only uhci.
>
> Actually, I suspected that this may be a poorly working Transaction
> Tranlating (TT) hub. Which then may work on certain versions of
> Windows.
>
> -- Pete

It looks to me more like a timing problem with initialization of the
external high-speed hub. Try this patch:

http://marc.theaimsgroup.com/?l=linux-usb-devel&m=112439094723976&w=2

Alan Stern

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