MUSB_EP0_STAGE_IDLE
musb->ep0_state = MUSB_EP0_STAGE_IDLE;
case MUSB_EP0_STAGE_IDLE: return "idle";
musb->ep0_state = MUSB_EP0_STAGE_IDLE;
musb->ep0_state = MUSB_EP0_STAGE_IDLE;
case MUSB_EP0_STAGE_IDLE:
musb->ep0_state = MUSB_EP0_STAGE_IDLE;
musb->ep0_state = MUSB_EP0_STAGE_IDLE;