> I have been working on map_urb_for_dma() and unmap_urb_for_dma(), and > it seems like a good idea to EXPORT the unmap routine so that HCDs > could call it when they need to revert to PIO. And of course, we will > also need to add changes for drivers that have to use PIO for control > transfers but can use DMA for other transfer types. > For this problem, two approaches were suggested: Either we need to add fine grained description of the DMA requirements or these exceptional drivers need to handle DMA issues on their own. We started off with the first approach, and then after the second one was suggested, we started looking at that (did not want to disturb other hcd drivers just because MUSB has a problem). Not sure which approach is better. - Anand -- 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
