On Mon, Feb 09, 2015 at 08:59:06PM -0500, Alan Stern wrote: > On Tue, 10 Feb 2015, Huang Rui wrote: > > > On Mon, Feb 09, 2015 at 10:59:42AM -0500, Alan Stern wrote: > > > On Mon, 9 Feb 2015, Huang Rui wrote: > > > > > > > Hi, > > > > > > > > Do you have any trick to downgrade one USB3 capacity device from super > > > > speed mode to high speed mode on xhci port via host side? > > > > > > Connect it to the host by a USB-2 cable. > > > > > > > If physical connection and port number are fixed, any idea on software > > side? > > It may be possible to do this by disabling the port in some way (put it > in some appropriate link state -- I don't know which one). When the > device sees the SuperSpeed connection is gone, it should reconnect at > high speed. > You mean I should set link status of the special port on SS.Disabled state, not let it into Rx.Detect statue, right? Then the link can not go to Polling, and the device aborts this port and reconnect to the USB2 roothub port, is that right? Thanks, Rui -- 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
