On 11/12/2024 5:54 PM, Greg KH wrote:
On Tue, Nov 12, 2024 at 05:51:04PM +0530, Raju Rangoju wrote:
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 either when an IN
endpoint with a 64ms service interval is pre-scheduled prior to
the ISOC OUT endpoint or when 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.
Signed-off-by: Raju Rangoju <Raju.Rangoju@xxxxxxx>
You don't want this backported to any older kernels? Why not?
Hi Greg, Yes, backporting is needed, but some of products were released
back in 2018, not sure of the exact commit id to quote here for
backporting as there were no precise commits that added this initial
support in the first place.
Would you mind tagging it to all stable kernels. Let me know if the
patch needs to be respinned.
thanks,
greg k-h
