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? thanks, greg k-h
