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 12:07:00 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Kirill A. Shutemov" <k.shutemov@...esys.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.24-rc3-mm1: usb mouse doesn't work

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.

Alan Stern

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