On Tue, 20 Dec 2011, Felipe Balbi wrote: > If we're using an IN endpoint, the DMA direction > is DMA_FROM_DEVICE, rather than DMA_TO_DEVICE. Are you sure you haven't got this backward? For DMA operations, the device is the thing doing the direct memory access -- in this case, the UDC controller. With IN endpoints, data goes from the gadget's memory, though the UDC controller, and over the USB bus to the host. That is _from_ memory _to_ UDC; hence the direction is DMA_TO_DEVICE. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
