U3D_DEV_LINK_INTR
mtu3_writel(mbase, U3D_DEV_LINK_INTR, ~0x0);
link = mtu3_readl(mbase, U3D_DEV_LINK_INTR);
mtu3_writel(mbase, U3D_DEV_LINK_INTR, link); /* W1C */