GZERO_ISOC_MAXPACKET 1253 drivers/usb/gadget/function/f_sourcesink.c ss_opts->isoc_maxpacket = GZERO_ISOC_MAXPACKET; GZERO_ISOC_MAXPACKET 64 drivers/usb/gadget/legacy/zero.c .isoc_maxpacket = GZERO_ISOC_MAXPACKET,