On Tue, 22 Jan 2013, Alan Stern wrote:
> On Tue, 22 Jan 2013, Norbert Preining wrote:
>
> > Hi Felipe, hi all,
> >
> > On Mo, 21 Jan 2013, Felipe Balbi wrote:
> > > Can you try rebuilding your kernel with CONFIG_USB_DEBUG=y and run your
> > > test again ? Maybe it gives us more information of what's going on.
> >
> > Ok, I can reliably reproduce the problem as follows:
> > * connect the kindle, it goes into usb disk mode
> > * !!! important !!! use the temporary gnome3 dbus window to "Eject"
> > the device
> > after that the device is not really ejected
> > * use "eject /dev/sdb"
> > after this the device is actually ejected
> > * unplug and replug
> > here the usb system does not recognize the device anymore, and
> > does not react on any usb connections
> > * call lsusb -v gets it back to normal
> > * repeat the above
> >
> > I have collected the syslog output of one of the cycles starting from
> > lsusb -v to get back to normal, plugging, ejecting with dbus window,
> > eject with cmd line, plug/replug without effect, etc.
> >
> > The log can be found at
> > http://www.preining.info/usb-syslog-prob.txt
> > I have documented the steps *in* the log file by calling
> > logger ....
> > with the appropriate steps, so please seach for
> > norbert:
> > which will give you the comments I have written with logger and
> > the sequence of actions.
> >
> > Hope that helps, and let me know if you want/need more details.
>
> It looks like things may improve if you do
>
> echo 50 >/sys/bus/usb/devices/usb1/power/autosuspend_delay_ms
>
> Quite possiblly your problem was caused when the default autosuspend
> delay for hubs was changed from 2 seconds to 0. Increasing it to 50 ms
> might fix things.
I did some testing over here. It looks like in addition to increasing
the autosuspend delay, the following patch is needed.
Alan Stern
Index: usb-3.7/drivers/usb/host/ehci-hub.c
===================================================================
--- usb-3.7.orig/drivers/usb/host/ehci-hub.c
+++ usb-3.7/drivers/usb/host/ehci-hub.c
@@ -591,6 +591,7 @@ ehci_hub_status_data (struct usb_hcd *hc
int ports, i, retval = 1;
unsigned long flags;
u32 ppcd = 0;
+ bool polling = false;
/* init status to no-changes */
buf [0] = 0;
@@ -648,8 +649,15 @@ ehci_hub_status_data (struct usb_hcd *hc
buf [1] |= 1 << (i - 7);
status = STS_PCD;
}
+ if (ehci->reset_done[i])
+ polling = true;
}
- /* FIXME autosuspend idle root hubs */
+
+ if (polling)
+ set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ else
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+
spin_unlock_irqrestore (&ehci->lock, flags);
return status ? retval : 0;
}
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