Hi Alan, On 7/5/07, Alan Stern <[EMAIL PROTECTED]> wrote: > On Wed, 4 Jul 2007, Felipe Balbi wrote: > > > > If the device firmware has gone crazy, reset the device, then port. > > > This is what HID does, for example, because in it's illegal for > > > HID devices to bunch reports together. > > > > and what about ending the session and starting all over again??? > > seems to me that we don't know what's causing the babble in some > > cases... so the only way out is ending the session in the usb host > > controller itself. > > Resetting the device (or its port -- I can't quite tell exactly what > Pete meant above) effectively _does_ start a new session. > > However with some devices, the only way to truly reset them is to > unplug their power cable. Not much the kernel can do then.
Some usb controllers (at least the one I've being working on) has a Session Bit in some register. When you clear that bit you force the controller to completely end the session. Is something like a software disconnect. When you write 1 again to that bit, the controller re-enumerates everything attached. > > Alan Stern > > -- Best Regards, Felipe Balbi [EMAIL PROTECTED] ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
