RP_VEND_XP
value = readl(port->base + RP_VEND_XP);
value = readl(port->base + RP_VEND_XP);
value = readl(port->base + RP_VEND_XP);
writel(value, port->base + RP_VEND_XP);
value = readl(port->base + RP_VEND_XP);
writel(value, port->base + RP_VEND_XP);