On Fri, Oct 19, 2018 at 06:17:31PM +0200, Josep M. Mirats Tur wrote: > Hi Bin, > > I was referring to the output of usbmon I attached in the previous > message (attached again) > > I'm sorry but I do not know how to acces the kernel menuconfig to > disable the MUSB CPPI DMA, how should I do that? In kernel menuconfig, go to Device Drivers ---> [*] USB support ---> <M> Inventra Highspeed Dual Role Controller (TI, ADI, AW, ...) ... <M> TI DSPS platforms *** MUSB DMA mode *** [*] Disable DMA (always use PIO) Please ensure the last option ("Disable DMA") is checked. Regards, -Bin.