Hi, 2011/4/7 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > On Thu, 7 Apr 2011, Enric Balletbà 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. ÂCurrent 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 ? > Alan Stern > > -- 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
