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xhci: fix frame id calculation and checks for isoc URBs

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Check if the expected frame IDs for a isochronous URB submitted
mid stream is within the valid frame time window that xHC controller
is capable of queuing TDs.

The range only needs to be checked once per URB as the isoc TDs of an
URB are queued in one go with spinlock held and interrupts disabled.

Calculate the valid frame window start and end frame id in frames
instead of microframes to better match how xhci specification
section 4.11.2.5 does it.

Don't add frame id gaps or change scheduling to SIA mid stream if
the start frame is outside the valid frame winow.
Only print a debug message.
Some devices can't handle gaps in isochronous transfers.

Calculate a valid start frame for the first URB of a stream, and
align it to a full frame, or to interval start if interval is longer
than a frame

Set urb->start_frame value for every URB

cc: Dylan Robinson <dylan_robinson@motu.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://patch.msgid.link/20260806142113.2436238-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2026-08-06 17:20:57 +03:00 • committed by Greg Kroah-Hartman
commit add8469b3e
3 changed files with 86 additions and 104 deletions
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