On Thu, Sep 24, 2015 at 04:46:22PM -0400, Alan Stern wrote: > It does. Grep for max_burst in drivers/usb/host/x*.c to see where it > gets used. (Note that in a couple of places involving USB-2 devices, > the code uses max_burst where it really means multiplicity.) OK, so this is very curious. I hacked the endpoint descriptors to set max_burst=1, max_esit_payload=1024, mult=0 (in xhci_endpoint_init, which seems to be the thing that actually produces the structures the device consumed, so I'm reasonably sure nothing else is modifying it on the way). Still it says COMP_BW_ERR. Setting interval=3 (it used to be 0) has no effect. Either my override isn't working, or this just isn't about bandwidth, but something else. I also tried ignoring the three other endpoints (early-out in xhci_add_endpoint) just to check that they weren't taking up some resource I was needing, and it didn't change anything. If I also ignore the video endpoint itself (0x83), the altsetting _does_ go through, but of course then I can't get any data from it. /* Steinar */ -- Homepage: http://www.sesse.net/ -- 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
