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 21:51:30 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Marin Mitov <mitov@...p.bas.bg>
cc:	"Kirill A. Shutemov" <k.shutemov@...esys.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.24-rc3-mm1: usb mouse doesn't work

On Thu, 22 Nov 2007, Marin Mitov wrote:

> > > > 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

But is it OK for 2.6.24-rc3-mm1?  Kirill said specifically that 
2.6.24-rc3 does not display the message but 2.6.24-rc3-mm1 does.

Alan Stern

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