1 files changed, 133 insertions, 211 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index f1abf4242cd2..650d75b73e0b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -29,6 +29,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/prefetch.h>
 #include <linux/pinctrl/consumer.h>
 #ifdef CONFIG_DEBUG_FS
@@ -146,38 +147,6 @@ static void stmmac_exit_fs(struct net_device *dev);
 
 #define STMMAC_COAL_TIMER(x) (ns_to_ktime((x) * NSEC_PER_USEC))
 
-int stmmac_bus_clks_config(struct stmmac_priv *priv, bool enabled)
-{
-	int ret = 0;
-
-	if (enabled) {
-		ret = clk_prepare_enable(priv->plat->stmmac_clk);
-		if (ret)
-			return ret;
-		ret = clk_prepare_enable(priv->plat->pclk);
-		if (ret) {
-			clk_disable_unprepare(priv->plat->stmmac_clk);
-			return ret;
-		}
-		if (priv->plat->clks_config) {
-			ret = priv->plat->clks_config(priv->plat->bsp_priv, enabled);
-			if (ret) {
-				clk_disable_unprepare(priv->plat->stmmac_clk);
-				clk_disable_unprepare(priv->plat->pclk);
-				return ret;
-			}
-		}
-	} else {
-		clk_disable_unprepare(priv->plat->stmmac_clk);
-		clk_disable_unprepare(priv->plat->pclk);
-		if (priv->plat->clks_config)
-			priv->plat->clks_config(priv->plat->bsp_priv, enabled);
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(stmmac_bus_clks_config);
-
 /**
  * stmmac_set_clk_tx_rate() - set the clock rate for the MAC transmit clock
  * @bsp_priv: BSP private data structure (unused)
@@ -312,77 +281,6 @@ static void stmmac_global_err(struct stmmac_priv *priv)
 	stmmac_service_event_schedule(priv);
 }
 
-/**
- * stmmac_clk_csr_set - dynamically set the MDC clock
- * @priv: driver private structure
- * Description: this is to dynamically set the MDC clock according to the csr
- * clock input.
- * Note:
- *	If a specific clk_csr value is passed from the platform
- *	this means that the CSR Clock Range selection cannot be
- *	changed at run-time and it is fixed (as reported in the driver
- *	documentation). Viceversa the driver will try to set the MDC
- *	clock dynamically according to the actual clock input.
- */
-static void stmmac_clk_csr_set(struct stmmac_priv *priv)
-{
-	unsigned long clk_rate;
-
-	clk_rate = clk_get_rate(priv->plat->stmmac_clk);
-
-	/* Platform provided default clk_csr would be assumed valid
-	 * for all other cases except for the below mentioned ones.
-	 * For values higher than the IEEE 802.3 specified frequency
-	 * we can not estimate the proper divider as it is not known
-	 * the frequency of clk_csr_i. So we do not change the default
-	 * divider.
-	 */
-	if (!(priv->clk_csr & MAC_CSR_H_FRQ_MASK)) {
-		if (clk_rate < CSR_F_35M)
-			priv->clk_csr = STMMAC_CSR_20_35M;
-		else if ((clk_rate >= CSR_F_35M) && (clk_rate < CSR_F_60M))
-			priv->clk_csr = STMMAC_CSR_35_60M;
-		else if ((clk_rate >= CSR_F_60M) && (clk_rate < CSR_F_100M))
-			priv->clk_csr = STMMAC_CSR_60_100M;
-		else if ((clk_rate >= CSR_F_100M) && (clk_rate < CSR_F_150M))
-			priv->clk_csr = STMMAC_CSR_100_150M;
-		else if ((clk_rate >= CSR_F_150M) && (clk_rate < CSR_F_250M))
-			priv->clk_csr = STMMAC_CSR_150_250M;
-		else if ((clk_rate >= CSR_F_250M) && (clk_rate <= CSR_F_300M))
-			priv->clk_csr = STMMAC_CSR_250_300M;
-		else if ((clk_rate >= CSR_F_300M) && (clk_rate < CSR_F_500M))
-			priv->clk_csr = STMMAC_CSR_300_500M;
-		else if ((clk_rate >= CSR_F_500M) && (clk_rate < CSR_F_800M))
-			priv->clk_csr = STMMAC_CSR_500_800M;
-	}
-
-	if (priv->plat->flags & STMMAC_FLAG_HAS_SUN8I) {
-		if (clk_rate > 160000000)
-			priv->clk_csr = 0x03;
-		else if (clk_rate > 80000000)
-			priv->clk_csr = 0x02;
-		else if (clk_rate > 40000000)
-			priv->clk_csr = 0x01;
-		else
-			priv->clk_csr = 0;
-	}
-
-	if (priv->plat->has_xgmac) {
-		if (clk_rate > 400000000)
-			priv->clk_csr = 0x5;
-		else if (clk_rate > 350000000)
-			priv->clk_csr = 0x4;
-		else if (clk_rate > 300000000)
-			priv->clk_csr = 0x3;
-		else if (clk_rate > 250000000)
-			priv->clk_csr = 0x2;
-		else if (clk_rate > 150000000)
-			priv->clk_csr = 0x1;
-		else
-			priv->clk_csr = 0x0;
-	}
-}
-
 static void print_pkt(unsigned char *buf, int len)
 {
 	pr_debug("len = %d byte, buf addr: 0x%p\n", len, buf);
@@ -795,16 +693,14 @@ static int stmmac_hwtstamp_get(struct net_device *dev,
  * Will be rerun after resuming from suspend, case in which the timestamping
  * flags updated by stmmac_hwtstamp_set() also need to be restored.
  */
-int stmmac_init_tstamp_counter(struct stmmac_priv *priv, u32 systime_flags)
+static int stmmac_init_tstamp_counter(struct stmmac_priv *priv,
+				      u32 systime_flags)
 {
 	bool xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
 	struct timespec64 now;
 	u32 sec_inc = 0;
 	u64 temp = 0;
 
-	if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp))
-		return -EOPNOTSUPP;
-
 	if (!priv->plat->clk_ptp_rate) {
 		netdev_err(priv->dev, "Invalid PTP clock rate");
 		return -EINVAL;
@@ -839,16 +735,15 @@ int stmmac_init_tstamp_counter(struct stmmac_priv *priv, u32 systime_flags)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(stmmac_init_tstamp_counter);
 
 /**
- * stmmac_init_ptp - init PTP
+ * stmmac_init_timestamping - initialise timestamping
  * @priv: driver private structure
  * Description: this is to verify if the HW supports the PTPv1 or PTPv2.
  * This is done by looking at the HW cap. register.
  * This function also registers the ptp driver.
  */
-static int stmmac_init_ptp(struct stmmac_priv *priv)
+static int stmmac_init_timestamping(struct stmmac_priv *priv)
 {
 	bool xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
 	int ret;
@@ -856,9 +751,16 @@ static int stmmac_init_ptp(struct stmmac_priv *priv)
 	if (priv->plat->ptp_clk_freq_config)
 		priv->plat->ptp_clk_freq_config(priv);
 
+	if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp)) {
+		netdev_info(priv->dev, "PTP not supported by HW\n");
+		return -EOPNOTSUPP;
+	}
+
 	ret = stmmac_init_tstamp_counter(priv, STMMAC_HWTS_ACTIVE);
-	if (ret)
+	if (ret) {
+		netdev_warn(priv->dev, "PTP init failed\n");
 		return ret;
+	}
 
 	priv->adv_ts = 0;
 	/* Check if adv_ts can be enabled for dwmac 4.x / xgmac core */
@@ -884,10 +786,24 @@ static int stmmac_init_ptp(struct stmmac_priv *priv)
 	return 0;
 }
 
+static void stmmac_setup_ptp(struct stmmac_priv *priv)
+{
+	int ret;
+
+	ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
+	if (ret < 0)
+		netdev_warn(priv->dev,
+			    "failed to enable PTP reference clock: %pe\n",
+			    ERR_PTR(ret));
+
+	if (stmmac_init_timestamping(priv) == 0)
+		stmmac_ptp_register(priv);
+}
+
 static void stmmac_release_ptp(struct stmmac_priv *priv)
 {
-	clk_disable_unprepare(priv->plat->clk_ptp_ref);
 	stmmac_ptp_unregister(priv);
+	clk_disable_unprepare(priv->plat->clk_ptp_ref);
 }
 
 /**
@@ -1169,7 +1085,7 @@ static const struct phylink_mac_ops stmmac_phylink_mac_ops = {
  */
 static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
 {
-	int interface = priv->plat->mac_interface;
+	int interface = priv->plat->phy_interface;
 
 	if (priv->dma_cap.pcs) {
 		if ((interface == PHY_INTERFACE_MODE_RGMII) ||
@@ -1196,13 +1112,19 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
 static int stmmac_init_phy(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
+	int mode = priv->plat->phy_interface;
 	struct fwnode_handle *phy_fwnode;
 	struct fwnode_handle *fwnode;
+	struct ethtool_keee eee;
 	int ret;
 
 	if (!phylink_expects_phy(priv->phylink))
 		return 0;
 
+	if (priv->hw->xpcs &&
+	    xpcs_get_an_mode(priv->hw->xpcs, mode) == DW_AN_C73)
+		return 0;
+
 	fwnode = priv->plat->port_node;
 	if (!fwnode)
 		fwnode = dev_fwnode(priv->device);
@@ -1236,19 +1158,20 @@ static int stmmac_init_phy(struct net_device *dev)
 		ret = phylink_fwnode_phy_connect(priv->phylink, fwnode, 0);
 	}
 
-	if (ret == 0) {
-		struct ethtool_keee eee;
+	if (ret) {
+		netdev_err(priv->dev, "cannot attach to PHY (error: %pe)\n",
+			   ERR_PTR(ret));
+		return ret;
+	}
 
-		/* Configure phylib's copy of the LPI timer. Normally,
-		 * phylink_config.lpi_timer_default would do this, but there is
-		 * a chance that userspace could change the eee_timer setting
-		 * via sysfs before the first open. Thus, preserve existing
-		 * behaviour.
-		 */
-		if (!phylink_ethtool_get_eee(priv->phylink, &eee)) {
-			eee.tx_lpi_timer = priv->tx_lpi_timer;
-			phylink_ethtool_set_eee(priv->phylink, &eee);
-		}
+	/* Configure phylib's copy of the LPI timer. Normally,
+	 * phylink_config.lpi_timer_default would do this, but there is a
+	 * chance that userspace could change the eee_timer setting via sysfs
+	 * before the first open. Thus, preserve existing behaviour.
+	 */
+	if (!phylink_ethtool_get_eee(priv->phylink, &eee)) {
+		eee.tx_lpi_timer = priv->tx_lpi_timer;
+		phylink_ethtool_set_eee(priv->phylink, &eee);
 	}
 
 	if (!priv->plat->pmt) {
@@ -1259,7 +1182,7 @@ static int stmmac_init_phy(struct net_device *dev)
 		device_set_wakeup_enable(priv->device, !!wol.wolopts);
 	}
 
-	return ret;
+	return 0;
 }
 
 static int stmmac_phy_setup(struct stmmac_priv *priv)
@@ -2584,6 +2507,7 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
 	struct netdev_queue *nq = netdev_get_tx_queue(priv->dev, queue);
 	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
 	struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[queue];
+	bool csum = !priv->plat->tx_queues_cfg[queue].coe_unsupported;
 	struct xsk_buff_pool *pool = tx_q->xsk_pool;
 	unsigned int entry = tx_q->cur_tx;
 	struct dma_desc *tx_desc = NULL;
@@ -2671,7 +2595,7 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
 		}
 
 		stmmac_prepare_tx_desc(priv, tx_desc, 1, xdp_desc.len,
-				       true, priv->mode, true, true,
+				       csum, priv->mode, true, true,
 				       xdp_desc.len);
 
 		stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);
@@ -3476,7 +3400,6 @@ static void stmmac_safety_feat_configuration(struct stmmac_priv *priv)
 /**
  * stmmac_hw_setup - setup mac in a usable state.
  *  @dev : pointer to the device structure.
- *  @ptp_register: register PTP if set
  *  Description:
  *  this is the main function to setup the HW in a usable state because the
  *  dma engine is reset, the core registers are configured (e.g. AXI,
@@ -3486,7 +3409,7 @@ static void stmmac_safety_feat_configuration(struct stmmac_priv *priv)
  *  0 on success and an appropriate (-)ve integer as defined in errno.h
  *  file on failure.
  */
-static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
+static int stmmac_hw_setup(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 rx_cnt = priv->plat->rx_queues_to_use;
@@ -3557,22 +3480,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
 
 	stmmac_mmc_setup(priv);
 
-	if (ptp_register) {
-		ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
-		if (ret < 0)
-			netdev_warn(priv->dev,
-				    "failed to enable PTP reference clock: %pe\n",
-				    ERR_PTR(ret));
-	}
-
-	ret = stmmac_init_ptp(priv);
-	if (ret == -EOPNOTSUPP)
-		netdev_info(priv->dev, "PTP not supported by HW\n");
-	else if (ret)
-		netdev_warn(priv->dev, "PTP init failed\n");
-	else if (ptp_register)
-		stmmac_ptp_register(priv);
-
 	if (priv->use_riwt) {
 		u32 queue;
 
@@ -3636,13 +3543,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
 	return 0;
 }
 
-static void stmmac_hw_teardown(struct net_device *dev)
-{
-	struct stmmac_priv *priv = netdev_priv(dev);
-
-	clk_disable_unprepare(priv->plat->clk_ptp_ref);
-}
-
 static void stmmac_free_irq(struct net_device *dev,
 			    enum request_irq_err irq_err, int irq_idx)
 {
@@ -3724,7 +3624,6 @@ static int stmmac_request_irq_multi_msi(struct net_device *dev)
 	/* Request the Wake IRQ in case of another line
 	 * is used for WoL
 	 */
-	priv->wol_irq_disabled = true;
 	if (priv->wol_irq > 0 && priv->wol_irq != dev->irq) {
 		int_name = priv->int_name_wol;
 		sprintf(int_name, "%s:%s", dev->name, "wol");
@@ -3885,7 +3784,6 @@ static int stmmac_request_irq_single(struct net_device *dev)
 	/* Request the Wake IRQ in case of another line
 	 * is used for WoL
 	 */
-	priv->wol_irq_disabled = true;
 	if (priv->wol_irq > 0 && priv->wol_irq != dev->irq) {
 		ret = request_irq(priv->wol_irq, stmmac_interrupt,
 				  IRQF_SHARED, dev->name, dev);
@@ -4034,29 +3932,9 @@ static int __stmmac_open(struct net_device *dev,
 			 struct stmmac_dma_conf *dma_conf)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
-	int mode = priv->plat->phy_interface;
 	u32 chan;
 	int ret;
 
-	/* Initialise the tx lpi timer, converting from msec to usec */
-	if (!priv->tx_lpi_timer)
-		priv->tx_lpi_timer = eee_timer * 1000;
-
-	ret = pm_runtime_resume_and_get(priv->device);
-	if (ret < 0)
-		return ret;
-
-	if ((!priv->hw->xpcs ||
-	     xpcs_get_an_mode(priv->hw->xpcs, mode) != DW_AN_C73)) {
-		ret = stmmac_init_phy(dev);
-		if (ret) {
-			netdev_err(priv->dev,
-				   "%s: Cannot attach to PHY (error: %d)\n",
-				   __func__, ret);
-			goto init_phy_error;
-		}
-	}
-
 	for (int i = 0; i < MTL_MAX_TX_QUEUES; i++)
 		if (priv->dma_conf.tx_queue[i].tbs & STMMAC_TBS_EN)
 			dma_conf->tx_queue[i].tbs = priv->dma_conf.tx_queue[i].tbs;
@@ -4074,12 +3952,14 @@ static int __stmmac_open(struct net_device *dev,
 		}
 	}
 
-	ret = stmmac_hw_setup(dev, true);
+	ret = stmmac_hw_setup(dev);
 	if (ret < 0) {
 		netdev_err(priv->dev, "%s: Hw setup failed\n", __func__);
 		goto init_error;
 	}
 
+	stmmac_setup_ptp(priv);
+
 	stmmac_init_coalesce(priv);
 
 	phylink_start(priv->phylink);
@@ -4102,11 +3982,8 @@ irq_error:
 	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
 		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);
 
-	stmmac_hw_teardown(dev);
+	stmmac_release_ptp(priv);
 init_error:
-	phylink_disconnect_phy(priv->phylink);
-init_phy_error:
-	pm_runtime_put(priv->device);
 	return ret;
 }
 
@@ -4116,34 +3993,54 @@ static int stmmac_open(struct net_device *dev)
 	struct stmmac_dma_conf *dma_conf;
 	int ret;
 
+	/* Initialise the tx lpi timer, converting from msec to usec */
+	if (!priv->tx_lpi_timer)
+		priv->tx_lpi_timer = eee_timer * 1000;
+
 	dma_conf = stmmac_setup_dma_desc(priv, dev->mtu);
 	if (IS_ERR(dma_conf))
 		return PTR_ERR(dma_conf);
 
+	ret = pm_runtime_resume_and_get(priv->device);
+	if (ret < 0)
+		goto err_dma_resources;
+
+	ret = stmmac_init_phy(dev);
+	if (ret)
+		goto err_runtime_pm;
+
 	ret = __stmmac_open(dev, dma_conf);
 	if (ret)
-		free_dma_desc_resources(priv, dma_conf);
+		goto err_disconnect_phy;
 
 	kfree(dma_conf);
+
+	return ret;
+
+err_disconnect_phy:
+	phylink_disconnect_phy(priv->phylink);
+err_runtime_pm:
+	pm_runtime_put(priv->device);
+err_dma_resources:
+	free_dma_desc_resources(priv, dma_conf);
+	kfree(dma_conf);
 	return ret;
 }
 
-/**
- *  stmmac_release - close entry point of the driver
- *  @dev : device pointer.
- *  Description:
- *  This is the stop entry point of the driver.
- */
-static int stmmac_release(struct net_device *dev)
+static void __stmmac_release(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 chan;
 
+	/* If the PHY or MAC has WoL enabled, then the PHY will not be
+	 * suspended when phylink_stop() is called below. Set the PHY
+	 * to its slowest speed to save power.
+	 */
 	if (device_may_wakeup(priv->device))
 		phylink_speed_down(priv->phylink, false);
+
 	/* Stop and disconnect the PHY */
 	phylink_stop(priv->phylink);
-	phylink_disconnect_phy(priv->phylink);
 
 	stmmac_disable_all_queues(priv);
 
@@ -4169,7 +4066,21 @@ static int stmmac_release(struct net_device *dev)
 
 	if (stmmac_fpe_supported(priv))
 		ethtool_mmsv_stop(&priv->fpe_cfg.mmsv);
+}
+
+/**
+ *  stmmac_release - close entry point of the driver
+ *  @dev : device pointer.
+ *  Description:
+ *  This is the stop entry point of the driver.
+ */
+static int stmmac_release(struct net_device *dev)
+{
+	struct stmmac_priv *priv = netdev_priv(dev);
+
+	__stmmac_release(dev);
 
+	phylink_disconnect_phy(priv->phylink);
 	pm_runtime_put(priv->device);
 
 	return 0;
@@ -4983,6 +4894,7 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
 {
 	struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[queue];
 	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
+	bool csum = !priv->plat->tx_queues_cfg[queue].coe_unsupported;
 	unsigned int entry = tx_q->cur_tx;
 	struct dma_desc *tx_desc;
 	dma_addr_t dma_addr;
@@ -5034,7 +4946,7 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
 	stmmac_set_desc_addr(priv, tx_desc, dma_addr);
 
 	stmmac_prepare_tx_desc(priv, tx_desc, 1, xdpf->len,
-			       true, priv->mode, true, true,
+			       csum, priv->mode, true, true,
 			       xdpf->len);
 
 	tx_q->tx_count_frames++;
@@ -5733,7 +5645,8 @@ drain_data:
 
 		skb->protocol = eth_type_trans(skb, priv->dev);
 
-		if (unlikely(!coe) || !stmmac_has_ip_ethertype(skb))
+		if (unlikely(!coe) || !stmmac_has_ip_ethertype(skb) ||
+		    (status & csum_none))
 			skb_checksum_none_assert(skb);
 		else
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
@@ -5965,7 +5878,7 @@ static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
 			return PTR_ERR(dma_conf);
 		}
 
-		stmmac_release(dev);
+		__stmmac_release(dev);
 
 		ret = __stmmac_open(dev, dma_conf);
 		if (ret) {
@@ -7055,7 +6968,6 @@ irq_error:
 	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
 		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);
 
-	stmmac_hw_teardown(dev);
 init_error:
 	free_dma_desc_resources(priv, &priv->dma_conf);
 dma_desc_error:
@@ -7240,7 +7152,6 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 		priv->plat->enh_desc = priv->dma_cap.enh_desc;
 		priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up &&
 				!(priv->plat->flags & STMMAC_FLAG_USE_PHY_WOL);
-		priv->hw->pmt = priv->plat->pmt;
 		if (priv->dma_cap.hash_tb_sz) {
 			priv->hw->multicast_filter_bins =
 					(BIT(priv->dma_cap.hash_tb_sz) << 5);
@@ -7278,6 +7189,7 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 	if (priv->plat->pmt) {
 		dev_info(priv->device, "Wake-Up On Lan supported\n");
 		device_set_wakeup_capable(priv->device, 1);
+		devm_pm_set_wake_irq(priv->device, priv->wol_irq);
 	}
 
 	if (priv->dma_cap.tsoen)
@@ -7710,17 +7622,6 @@ int stmmac_dvr_probe(struct device *device,
 
 	stmmac_fpe_init(priv);
 
-	/* If a specific clk_csr value is passed from the platform
-	 * this means that the CSR Clock Range selection cannot be
-	 * changed at run-time and it is fixed. Viceversa the driver'll try to
-	 * set the MDC clock dynamically according to the csr actual
-	 * clock input.
-	 */
-	if (priv->plat->clk_csr >= 0)
-		priv->clk_csr = priv->plat->clk_csr;
-	else
-		stmmac_clk_csr_set(priv);
-
 	stmmac_check_pcs_mode(priv);
 
 	pm_runtime_get_noresume(device);
@@ -7858,7 +7759,7 @@ int stmmac_suspend(struct device *dev)
 		priv->plat->serdes_powerdown(ndev, priv->plat->bsp_priv);
 
 	/* Enable Power down mode by programming the PMT regs */
-	if (device_may_wakeup(priv->device) && priv->plat->pmt) {
+	if (stmmac_wol_enabled_mac(priv)) {
 		stmmac_pmt(priv, priv->hw, priv->wolopts);
 		priv->irq_wake = 1;
 	} else {
@@ -7869,16 +7770,18 @@ int stmmac_suspend(struct device *dev)
 	mutex_unlock(&priv->lock);
 
 	rtnl_lock();
-	if (device_may_wakeup(priv->device) && !priv->plat->pmt)
+	if (stmmac_wol_enabled_phy(priv))
 		phylink_speed_down(priv->phylink, false);
 
-	phylink_suspend(priv->phylink,
-			device_may_wakeup(priv->device) && priv->plat->pmt);
+	phylink_suspend(priv->phylink, stmmac_wol_enabled_mac(priv));
 	rtnl_unlock();
 
 	if (stmmac_fpe_supported(priv))
 		ethtool_mmsv_stop(&priv->fpe_cfg.mmsv);
 
+	if (priv->plat->suspend)
+		return priv->plat->suspend(dev, priv->plat->bsp_priv);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(stmmac_suspend);
@@ -7931,6 +7834,12 @@ int stmmac_resume(struct device *dev)
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	int ret;
 
+	if (priv->plat->resume) {
+		ret = priv->plat->resume(dev, priv->plat->bsp_priv);
+		if (ret)
+			return ret;
+	}
+
 	if (!netif_running(ndev))
 		return 0;
 
@@ -7940,7 +7849,7 @@ int stmmac_resume(struct device *dev)
 	 * this bit because it can generate problems while resuming
 	 * from another devices (e.g. serial console).
 	 */
-	if (device_may_wakeup(priv->device) && priv->plat->pmt) {
+	if (stmmac_wol_enabled_mac(priv)) {
 		mutex_lock(&priv->lock);
 		stmmac_pmt(priv, priv->hw, 0);
 		mutex_unlock(&priv->lock);
@@ -7975,7 +7884,16 @@ int stmmac_resume(struct device *dev)
 	stmmac_free_tx_skbufs(priv);
 	stmmac_clear_descriptors(priv, &priv->dma_conf);
 
-	stmmac_hw_setup(ndev, false);
+	ret = stmmac_hw_setup(ndev);
+	if (ret < 0) {
+		netdev_err(priv->dev, "%s: Hw setup failed\n", __func__);
+		mutex_unlock(&priv->lock);
+		rtnl_unlock();
+		return ret;
+	}
+
+	stmmac_init_timestamping(priv);
+
 	stmmac_init_coalesce(priv);
 	phylink_rx_clk_stop_block(priv->phylink);
 	stmmac_set_rx_mode(ndev);
@@ -7993,7 +7911,7 @@ int stmmac_resume(struct device *dev)
 	 * workqueue thread, which will race with initialisation.
 	 */
 	phylink_resume(priv->phylink);
-	if (device_may_wakeup(priv->device) && !priv->plat->pmt)
+	if (stmmac_wol_enabled_phy(priv))
 		phylink_speed_up(priv->phylink);
 
 	rtnl_unlock();
@@ -8004,6 +7922,10 @@ int stmmac_resume(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(stmmac_resume);
 
+/* This is not the same as EXPORT_GPL_SIMPLE_DEV_PM_OPS() when CONFIG_PM=n */
+DEFINE_SIMPLE_DEV_PM_OPS(stmmac_simple_pm_ops, stmmac_suspend, stmmac_resume);
+EXPORT_SYMBOL_GPL(stmmac_simple_pm_ops);
+
 #ifndef MODULE
 static int __init stmmac_cmdline_opt(char *str)
 {