musb: Add support for dma fifo reads and performance tuning

Using dma for reading the fifo, and tightening the loop around
transfers, allows us to quadruple the data throughput or more.

Change-Id: I09c6c5fb85a6c2cc8216c09066479370307dcd42
Signed-off-by: Mike J. Chen <mjchen@google.com>
2 files changed