On Thu, Apr 07, 2011 at 11:03:38PM +0200, Enric Balletbò i Serra wrote: > Hi, > > 2011/4/7 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > > On Thu, 7 Apr 2011, Enric Balletbò i Serra wrote: > > > >> Hi all, > >> > >> I'm experimenting some issues with USB on IGEP v2 board, in certain > >> cases I've an USB disconnect when I plug a device. For me it fails > >> with kernel 2.6.35 but I think it also affect newer kernel, the issue > >> is easy to reproduce following these steps: > >> > >> 1. Power up the board (without any device connected ) > >> > >> 2. When kernel is up, connect a powered USB HUB 2.0 to the USB host > >> port, kernel shows, > >> > >> usb 1-1: new high speed USB device using ehci-omap and address 2 > >> usb 1-1: New USB device found, idVendor=05e3, idProduct=0608 > >> usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0 > >> usb 1-1: Product: USB2.0 Hub > >> hub 1-1:1.0: USB hub found > >> hub 1-1:1.0: 4 ports detected > >> usb 1-1.4: new high speed USB device using ehci-omap and address 3 > >> usb 1-1.4: New USB device found, idVendor=05e3, idProduct=0608 > >> usb 1-1.4: New USB device strings: Mfr=0, Product=1, SerialNumber=0 > >> usb 1-1.4: Product: USB2.0 Hub > >> hub 1-1.4:1.0: USB hub found > >> hub 1-1.4:1.0: 4 ports detected > >> > >> 3. Then if I connect a device (for example a pendrive) to the HUB I > >> get USB disconnect message > >> > >> usb 1-1: USB disconnect, address 2 > >> usb 1-1.4: USB disconnect, address 3 > >> > >> OTOH, it works without problem > >> 1. if power up the board with the USB HUB connected to the USB Host > >> port and the device connected to the USB hub. > >> 2. if after kernel is up, connect the USB HUB + device to the USB Host port > >> > >> Anyone is experimenting something like this with other OMAP3-based boards ? > > > > At first glance, it looks like a power-related issue. Current inrush > > when the device is plugged in, or something like that. > > > > What happens if you attach the hub and pendrive to a standard PC? > > > > With standard PC works as expected, would be possible a problem with > omap-ehci driver ? Maybe Felipe can give some light ? Maybe PM is kicking in and turning off the clocks. Donno. What if you use function tracer so we know the last called function before the problem ? Just filter the call to *hci*. -- balbi -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
