linux-kernel - Re: [linux-usb-devel] 2.6.24-rc3-mm1: usb mouse doesn't work

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Date:	Thu, 22 Nov 2007 19:41:44 +0200
From:	Marin Mitov <mitov@...p.bas.bg>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] 2.6.24-rc3-mm1: usb mouse doesn't work

On Thursday 22 November 2007 07:07:00 pm you wrote:
> On Thu, 22 Nov 2007, Kirill A. Shutemov wrote:
> > > > uhci_hcd 0000:00:1d.3: UHCI Host Controller
> > > > uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 4
> > > > uhci_hcd 0000:00:1d.3: irq 7, io base 0x0000bf20
> > > > usb usb4: configuration #1 chosen from 1 choice
> > > > hub 4-0:1.0: USB hub found
> > > > hub 4-0:1.0: 2 ports detected
> > > > usb usb4: new device found, idVendor=0000, idProduct=0000
> > > > usb usb4: new device strings: Mfr=3, Product=2, SerialNumber=1
> > > > usb usb4: Product: UHCI Host Controller
> > > > usb usb4: Manufacturer: Linux 2.6.24-kas-alt1 uhci_hcd
> > > > usb usb4: SerialNumber: 0000:00:1d.3
> > > > uhci_hcd 0000:00:1d.3: FGR not stopped yet!
> > >
> > > I've had some strangenesses with USB lately.  Sometimes running `lsusb'
> > > makes the USB system notice a newly attached device.
> >
> > No. But I have new messages in dmesg:
> >
> > uhci_hcd 0000:00:1d.3: FGR not stopped yet!
> > uhci_hcd 0000:00:1d.2: FGR not stopped yet!
> > uhci_hcd 0000:00:1d.1: FGR not stopped yet!
> > uhci_hcd 0000:00:1d.0: FGR not stopped yet!
> >
> > > Is that "FGR not stopped yet!" messgae new behaviour?
> >
> > It is a new message since 2.6.24-rc3. I have never try -mm tree before.
>
> These messages could indicate a timing problem.  You can see the code
> that writes the messages near the end of wakeup_rh() in
> drivers/usb/host/uhci-hcd.c.
>
> The message gets written if the controller hardware hasn't turned off a
> particular bit after a 4-us delay.  If the udelay() function wasn't
> working right, it could cause this problem.

udelay() _is_ OK for 2.6.24-rc3, so it is not the cause of the problem

Marin Mitov
>
> Alan Stern
>
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