TX_RQ_REG_EN
writel_relaxed(BITS_TX_RQ_DEPTH_EN, priv->base + TX_RQ_REG_EN);
writel_relaxed(0, priv->base + TX_RQ_REG_EN);
writel_relaxed(BITS_TX_RQ_START_ADDR_EN, priv->base + TX_RQ_REG_EN);
writel_relaxed(0, priv->base + TX_RQ_REG_EN);