AST_VHUB_EP_ACK_ISR
readl(vhub->regs + AST_VHUB_EP_ACK_ISR),
u32 ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR);
writel(epn_mask, vhub->regs + AST_VHUB_EP_ACK_ISR);
writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);
writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR);