TUSB_EP_MAX_PACKET_SIZE_OFFSET
psize = musb_readl(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET);
musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, psize);
psize = musb_readl(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET);
musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, psize);