On Wed, Sep 06, 2006 at 11:53:51AM -0400, Alan Stern wrote:
> On Sat, 2 Sep 2006, Greg KH wrote:
>
> > > > > Hm, I plugged a different 2.0 hub into my root port, and it showed up.
> > > > > Then it suspended. Plugged a device into it, nothing. Removed the
> > > > > hub,
> > > > > nothing then either. The ehci driver still thinks this hub is present
> > > > > :(
> > > >
> > > > Tried it with the same hub in my laptop (different ehci controller).
> > > > Same thing happened :(
> > >
> > > Let's see if I understand this right:
> > >
> > > You start out with nothing plugged in, and your EHCI root hub is
> > > suspended.
> >
> > In one situation yes, in another no.
> >
> > > Then you plug in a 2.0 hub; the root hub wakes up and recognizes the
> > > external hub. 2 seconds later the external hub gets suspended and 2
> > > seconds after that the root hub gets suspended.
> >
> > Yes.
> >
> > > If you plug another device into the external hub, nothing wakes up.
> >
> > Correct.
> >
> > > If you unplug the external hub from the computer, the root hub doesn't
> > > wake up.
> >
> > Correct.
> >
> > > This seems very strange. Why should the root hub wake up when you
> > > connect
> > > the external hub but not when you disconnect it?
> >
> > That seems to be the problem here :)
> >
> > > Seeing the dmesg log might help. You might also want to add some
> > > debugging printk's to ehci_irq() in ehci-hcd.c, especially in the "if
> > > (status & STS_PCD)" section.
> >
> > There is nothing in the debug log when I remove the hub, or connect the
> > device.
> >
> > > (Hmmm, looking at that code it appears that "status" is not handled very
> > > well. The result from readl(&ehci->regs->command) shouldn't be allowed to
> > > overwrite it.)
> >
> > Care to make a fix? :)
> >
> > I don't have the time right now for the next few days to work much on
> > this (family stuff.) Let me get back to you on Tuesday...
>
> When you have a chance to work on this, here are some things to try:
Ugh, now uhci is dead, and when I try to unload it it just hangs.
So I dropped:
usb/usb-hub-driver-perform-autosuspend.patch
and:
usb/ehci-hcd-fix-root-hub-wakeup-support.patch
from my trees and everything is back to working.
I'm also sorry, but I don't have the time to debug this right now
(leaving for a week long trip in a few days, have 2 presentations to
write, some assorted lawyer fun, and need to get some "real work" done
before I leave too...) so I'm just going to drop those two patches for
now so that my tree can get back into the next -mm release.
thanks,
greg k-h
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