Alan Stern wrote: > ... > This trace shows that the frame numbers do not increase sequentially: > 1057125, 1057126, 1057128, 1057129, 1053131, ... This is because the > new driver is a little more conservative than the old driver, > requiring latencies to be larger than 1 ms. You can see this > explicitly in one of the new lines added by the commit you found: > > + next = uhci->frame_number + 2; > > That 2 is the minimum latency, in frames (one frame per ms). One frame worked fine with the old driver. What is the reason for this regression? > Anyway, the solution is simple: The audio driver needs either to submit > buffers that are at least 2 ms long, or to use more than two buffers > (or both). The audio driver already has the infrastructure to cope for hardware restrictions like this, it just needs to *know* about them. How can it detect that it runs on the OHCI/UHCI drivers? Regards, Clemens -- 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
