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authorAnand Gadiyar <gadiyar@ti.com>2010-11-08 01:20:30 -0500
committerFelipe Balbi <balbi@ti.com>2010-11-09 03:24:35 -0500
commit6e16edfe62eb49274c8a74dc04d1c6f315f8f82b (patch)
tree0292ee9bf87e43207041c195a245f3997bae7566 /net
parent07397021058b7db468b67f8c41ce29ef6331ab92 (diff)
usb: musb: fail unaligned DMA transfers on v1.8 and above
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 <gadiyar@ti.com> Tested-by: Ming Lei <tom.leiming@gmail.com> Cc: Ajay Kumar Gupta <ajay.gupta@ti.com> Cc: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
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