4dd770891d
Drivers need to specify their bandwidth requirements to bus-scaling driver to get guaranteed bandwidth on fabrics. USB hardware uses a single buffer to transfer data across the bus. As a result USB performance is highly dependent on system fabric frequency as USB controller continuously sends NAKs on the USB BUS unless complete buffer is filled/drained to the memory. Hence, request for high bus bandwidth as long as USB cable is connected to improve USB throughput. While testing with Class-10 Extreme III SD cards, this patch seems to improve the IN performance from 15MBps to 24MBps and OUT performance from 11MBps to 16MBps. CRs-Fixed: 327557 Change-Id: I21c284c611a09b1b12df9ae7a6f39e0b1bff45ef Signed-off-by: Manu Gautam <mgautam@codeaurora.org>