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authorRaju Rangoju <Raju.Rangoju@amd.com>2025-06-27 17:41:19 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2025-06-28 17:19:57 +0200
commitcbc889ab0122366f6cdbe3c28d477c683ebcebc2 (patch)
treec33078e2c051cce39c3c7cb5256321dfe51e6f29 /scripts/lib/kdoc/kdoc_parser.py
parent80e08394377559ed5a2ccadd861e62d24b826911 (diff)
usb: xhci: quirk for data loss in ISOC transfers
During the High-Speed Isochronous Audio transfers, xHCI controller on certain AMD platforms experiences momentary data loss. This results in Missed Service Errors (MSE) being generated by the xHCI. The root cause of the MSE is attributed to the ISOC OUT endpoint being omitted from scheduling. This can happen when an IN endpoint with a 64ms service interval either is pre-scheduled prior to the ISOC OUT endpoint or the interval of the ISOC OUT endpoint is shorter than that of the IN endpoint. Consequently, the OUT service is neglected when an IN endpoint with a service interval exceeding 32ms is scheduled concurrently (every 64ms in this scenario). This issue is particularly seen on certain older AMD platforms. To mitigate this problem, it is recommended to adjust the service interval of the IN endpoint to not exceed 32ms (interval 8). This adjustment ensures that the OUT endpoint will not be bypassed, even if a smaller interval value is utilized. Cc: stable <stable@kernel.org> Signed-off-by: Raju Rangoju <Raju.Rangoju@amd.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20250627144127.3889714-2-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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