usb: gadget: uac2: add req_number as parameter
There are only two requests for uac2, it may not be enough at high loading system which usb interrupt handler can't be serviced on time, then the data will be lost since it is isoc transfer for audio. In this patch, we introduce a parameter for the number for usb request, and the user can override it if current number for request is not enough for his/her use case. Besides, update this parameter for legacy audio gadget and documentation. Signed-off-by:Peter Chen <peter.chen@nxp.com> Signed-off-by:
Felipe Balbi <felipe.balbi@linux.intel.com>
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