On Wed, 23 Jan 2013, Sarah Sharp wrote: > > So I guess my next question is: What are you plans, if any, to add the > > "new" enumeration scheme to xHCI? Is this a huge amount of work? > > Not a huge amount of work, but it does require an API change to the USB > host controller driver functions, so the patch itself is not likely to > get backported to stable kernels. And I have no idea how the current > batch of USB 3.0 devices will react to an enumeration sequence change. I thought this wasn't possible at all, because the xHCI hardware automatically assigns an address to the device when a reset completes. "Old" scheme: Reset Get device descriptor (8 bytes) Set address Get device descriptor (18 bytes) "New" scheme: Reset Get device descriptor (64 bytes) Reset Set address Get device descriptor (18 bytes) Given the way the hardware behaves, it's not really possible to do either of these. 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
