On Sun, Oct 31, 2010 at 12:25:59AM -0500, Gadiyar, Anand wrote:
The Inventra DMA engine in version 1.8 and later of the MUSB
controller cannot handle DMA addresses that are not aligned
to a 4 byte boundary. It ends up ignoring the last two bits
programmed in the DMA_ADDR register. This is a deliberate
design change in the controller and is documented in the
programming guide.
Earlier versions of the controller could handle these
accesses just fine.
Fail dma_channel_program if we see an unaligned address when
using the newer controllers, so that the caller can carry out
the transfer using PIO mode.
(Current callers already have this backup path in place).
Signed-off-by: Anand Gadiyar <[email protected]>
Cc: Felipe Balbi <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Ajay Kumar Gupta <[email protected]>
Cc: Mike Frysinger <[email protected]>
please fix comment from Sergei and resend without RFC.
--
balbi
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