usb: xhci: implement Get Port Bandwidth command

If the xHC detects an oversubscription of bandwidth, it send a Bandwidth
Error completion code in the Command Completion event. The Get Port
Bandwidth command can be used to show the available bandwidth of each
root hub port of the xHC.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
3 files changed