[RFC] ux500 dma & short transfers on MUSB

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Hello,

following scenario:
you attach an UART-TO-USB adapter to your musb port running ux500-dma
code. The USB UARt driver queues 1x RX URB with the size of 256 bytes
(example) and the max packet size is 64.

The other side sends only one byte because it is mean.
Now, the way I understand it is, you tell musb that the complete
transfer of 256 bytes has ended instead one byte that really
happened. Is my assumption wrong?

Sebastian
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