On Thu, Jan 14, 2010 at 10:33:44AM -0800, Greg KH wrote: > On Thu, Jan 14, 2010 at 10:22:41AM +0100, Kurt Garloff wrote: > > Greg, > > > > On Wed, Jan 13, 2010 at 07:27:16PM -0800, Greg K-H wrote: > > > Kurt noticed a few problems with a USB 3.0 controller (he was the first > > > to tell me about it being in a shipping product). One of them was the > > > lack of a speed for the USB 3.0 controller. > > > > You can order a PCIe x4 card U3S6 from Asus which combines SATA 6G > > (Marvell) with a NEC USB3 controller for less than 50$. > > > > > Sarah, what should we use here, a "real" bitrate, or just "super" for > > > the speed? Can devices change speed when they are connected? Right now USB 3.0 devices cannot change speed once they are connected. They can change to high speed or full speed devices if the USB 3.0 electrical termination is removed, but from a software perspective they're not USB 3.0 devices anymore. The USB 3.0 specification does list the speeds in an interesting way that makes me think we could see USB 3.0 devices be faster than 5Gb/s. Checkout Table 9-13. > > As the other speed values are numeric, wouldn't it be better to report > > 5000 instead of "super". (For "variable", that would not help and I > > would not know an obvious value, except maybe the maximum possible > > value?) > > Good point, I'll just use that for now. Yep, it's 5000. Or should that be 5120? I could never do that math right. Sarah Sharp -- 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
