[Bug 220748] usb: xhci_queue_isoc_tx_prepare ignore start_frame and always assumes URB_ISO_ASAP is set

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220748

--- Comment #3 from Nicola Lunghi (nick83ola@gmail.com) ---
sorry haven't finished responding. I can try to skip directly to
skip_start_over but the logic in ehci-sched seems more complicated than that
and not being familiar with usb protocol I don't know how for example debug
this. what could be a test setup to see the frames or record the frame that are
sent and the timing? with the ASAP scheduling if a driver try to send the
frames at a specific intervals the xhci driver 'breaks' all the syncronizations
in the way is this implemented.

the issue arised from a Motu AVB interface that expect a precise message rate
and without it it looses the channel synchronization as it expect a specific
rate for the messages.

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