I'm currently trying to finish adding support for the S3C high-speed gadget (and OtG) block and have come across an issue when mapping buffers for DMA. With the ethernet gadget, the buffers are often not aligned to a 4 byte boundary, and thus when we call dma_map_single() on the buffer we end up with an unaligned address which the controller cannot handle (it can only DMA to 4 byte aligned addresses). I have tried setting the DMA mask with the lowest two bits unset, but this hasn't solved the problem. Does anyone have any comments on what to do in this case? Is there anything that can be done to get the gadget to pass aligned buffer? Should the driver make an alignment buffer to take the data? -- Ben Q: What's a light-year? A: One-third less calories than a regular year. -- 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
