These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

3 files changed, 434 insertions, 101 deletions

diff --git a/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 6043734ea..17f017ab4 100644
--- a/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -205,6 +205,23 @@ enum dma_reg {
 	DMA_INDEX2RING_5,
 	DMA_INDEX2RING_6,
 	DMA_INDEX2RING_7,
+	DMA_RING0_TIMEOUT,
+	DMA_RING1_TIMEOUT,
+	DMA_RING2_TIMEOUT,
+	DMA_RING3_TIMEOUT,
+	DMA_RING4_TIMEOUT,
+	DMA_RING5_TIMEOUT,
+	DMA_RING6_TIMEOUT,
+	DMA_RING7_TIMEOUT,
+	DMA_RING8_TIMEOUT,
+	DMA_RING9_TIMEOUT,
+	DMA_RING10_TIMEOUT,
+	DMA_RING11_TIMEOUT,
+	DMA_RING12_TIMEOUT,
+	DMA_RING13_TIMEOUT,
+	DMA_RING14_TIMEOUT,
+	DMA_RING15_TIMEOUT,
+	DMA_RING16_TIMEOUT,
 };
 
 static const u8 bcmgenet_dma_regs_v3plus[] = {
@@ -216,6 +233,23 @@ static const u8 bcmgenet_dma_regs_v3plus[] = {
 	[DMA_PRIORITY_0]	= 0x30,
 	[DMA_PRIORITY_1]	= 0x34,
 	[DMA_PRIORITY_2]	= 0x38,
+	[DMA_RING0_TIMEOUT]	= 0x2C,
+	[DMA_RING1_TIMEOUT]	= 0x30,
+	[DMA_RING2_TIMEOUT]	= 0x34,
+	[DMA_RING3_TIMEOUT]	= 0x38,
+	[DMA_RING4_TIMEOUT]	= 0x3c,
+	[DMA_RING5_TIMEOUT]	= 0x40,
+	[DMA_RING6_TIMEOUT]	= 0x44,
+	[DMA_RING7_TIMEOUT]	= 0x48,
+	[DMA_RING8_TIMEOUT]	= 0x4c,
+	[DMA_RING9_TIMEOUT]	= 0x50,
+	[DMA_RING10_TIMEOUT]	= 0x54,
+	[DMA_RING11_TIMEOUT]	= 0x58,
+	[DMA_RING12_TIMEOUT]	= 0x5c,
+	[DMA_RING13_TIMEOUT]	= 0x60,
+	[DMA_RING14_TIMEOUT]	= 0x64,
+	[DMA_RING15_TIMEOUT]	= 0x68,
+	[DMA_RING16_TIMEOUT]	= 0x6C,
 	[DMA_INDEX2RING_0]	= 0x70,
 	[DMA_INDEX2RING_1]	= 0x74,
 	[DMA_INDEX2RING_2]	= 0x78,
@@ -235,6 +269,23 @@ static const u8 bcmgenet_dma_regs_v2[] = {
 	[DMA_PRIORITY_0]	= 0x34,
 	[DMA_PRIORITY_1]	= 0x38,
 	[DMA_PRIORITY_2]	= 0x3C,
+	[DMA_RING0_TIMEOUT]	= 0x2C,
+	[DMA_RING1_TIMEOUT]	= 0x30,
+	[DMA_RING2_TIMEOUT]	= 0x34,
+	[DMA_RING3_TIMEOUT]	= 0x38,
+	[DMA_RING4_TIMEOUT]	= 0x3c,
+	[DMA_RING5_TIMEOUT]	= 0x40,
+	[DMA_RING6_TIMEOUT]	= 0x44,
+	[DMA_RING7_TIMEOUT]	= 0x48,
+	[DMA_RING8_TIMEOUT]	= 0x4c,
+	[DMA_RING9_TIMEOUT]	= 0x50,
+	[DMA_RING10_TIMEOUT]	= 0x54,
+	[DMA_RING11_TIMEOUT]	= 0x58,
+	[DMA_RING12_TIMEOUT]	= 0x5c,
+	[DMA_RING13_TIMEOUT]	= 0x60,
+	[DMA_RING14_TIMEOUT]	= 0x64,
+	[DMA_RING15_TIMEOUT]	= 0x68,
+	[DMA_RING16_TIMEOUT]	= 0x6C,
 };
 
 static const u8 bcmgenet_dma_regs_v1[] = {
@@ -245,6 +296,23 @@ static const u8 bcmgenet_dma_regs_v1[] = {
 	[DMA_PRIORITY_0]	= 0x34,
 	[DMA_PRIORITY_1]	= 0x38,
 	[DMA_PRIORITY_2]	= 0x3C,
+	[DMA_RING0_TIMEOUT]	= 0x2C,
+	[DMA_RING1_TIMEOUT]	= 0x30,
+	[DMA_RING2_TIMEOUT]	= 0x34,
+	[DMA_RING3_TIMEOUT]	= 0x38,
+	[DMA_RING4_TIMEOUT]	= 0x3c,
+	[DMA_RING5_TIMEOUT]	= 0x40,
+	[DMA_RING6_TIMEOUT]	= 0x44,
+	[DMA_RING7_TIMEOUT]	= 0x48,
+	[DMA_RING8_TIMEOUT]	= 0x4c,
+	[DMA_RING9_TIMEOUT]	= 0x50,
+	[DMA_RING10_TIMEOUT]	= 0x54,
+	[DMA_RING11_TIMEOUT]	= 0x58,
+	[DMA_RING12_TIMEOUT]	= 0x5c,
+	[DMA_RING13_TIMEOUT]	= 0x60,
+	[DMA_RING14_TIMEOUT]	= 0x64,
+	[DMA_RING15_TIMEOUT]	= 0x68,
+	[DMA_RING16_TIMEOUT]	= 0x6C,
 };
 
 /* Set at runtime once bcmgenet version is known */
@@ -498,6 +566,85 @@ static void bcmgenet_set_msglevel(struct net_device *dev, u32 level)
 	priv->msg_enable = level;
 }
 
+static int bcmgenet_get_coalesce(struct net_device *dev,
+				 struct ethtool_coalesce *ec)
+{
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+
+	ec->tx_max_coalesced_frames =
+		bcmgenet_tdma_ring_readl(priv, DESC_INDEX,
+					 DMA_MBUF_DONE_THRESH);
+	ec->rx_max_coalesced_frames =
+		bcmgenet_rdma_ring_readl(priv, DESC_INDEX,
+					 DMA_MBUF_DONE_THRESH);
+	ec->rx_coalesce_usecs =
+		bcmgenet_rdma_readl(priv, DMA_RING16_TIMEOUT) * 8192 / 1000;
+
+	return 0;
+}
+
+static int bcmgenet_set_coalesce(struct net_device *dev,
+				 struct ethtool_coalesce *ec)
+{
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+	unsigned int i;
+	u32 reg;
+
+	/* Base system clock is 125Mhz, DMA timeout is this reference clock
+	 * divided by 1024, which yields roughly 8.192us, our maximum value
+	 * has to fit in the DMA_TIMEOUT_MASK (16 bits)
+	 */
+	if (ec->tx_max_coalesced_frames > DMA_INTR_THRESHOLD_MASK ||
+	    ec->tx_max_coalesced_frames == 0 ||
+	    ec->rx_max_coalesced_frames > DMA_INTR_THRESHOLD_MASK ||
+	    ec->rx_coalesce_usecs > (DMA_TIMEOUT_MASK * 8) + 1)
+		return -EINVAL;
+
+	if (ec->rx_coalesce_usecs == 0 && ec->rx_max_coalesced_frames == 0)
+		return -EINVAL;
+
+	/* GENET TDMA hardware does not support a configurable timeout, but will
+	 * always generate an interrupt either after MBDONE packets have been
+	 * transmitted, or when the ring is emtpy.
+	 */
+	if (ec->tx_coalesce_usecs || ec->tx_coalesce_usecs_high ||
+	    ec->tx_coalesce_usecs_irq || ec->tx_coalesce_usecs_low)
+		return -EOPNOTSUPP;
+
+	/* Program all TX queues with the same values, as there is no
+	 * ethtool knob to do coalescing on a per-queue basis
+	 */
+	for (i = 0; i < priv->hw_params->tx_queues; i++)
+		bcmgenet_tdma_ring_writel(priv, i,
+					  ec->tx_max_coalesced_frames,
+					  DMA_MBUF_DONE_THRESH);
+	bcmgenet_tdma_ring_writel(priv, DESC_INDEX,
+				  ec->tx_max_coalesced_frames,
+				  DMA_MBUF_DONE_THRESH);
+
+	for (i = 0; i < priv->hw_params->rx_queues; i++) {
+		bcmgenet_rdma_ring_writel(priv, i,
+					  ec->rx_max_coalesced_frames,
+					  DMA_MBUF_DONE_THRESH);
+
+		reg = bcmgenet_rdma_readl(priv, DMA_RING0_TIMEOUT + i);
+		reg &= ~DMA_TIMEOUT_MASK;
+		reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192);
+		bcmgenet_rdma_writel(priv, reg, DMA_RING0_TIMEOUT + i);
+	}
+
+	bcmgenet_rdma_ring_writel(priv, DESC_INDEX,
+				  ec->rx_max_coalesced_frames,
+				  DMA_MBUF_DONE_THRESH);
+
+	reg = bcmgenet_rdma_readl(priv, DMA_RING16_TIMEOUT);
+	reg &= ~DMA_TIMEOUT_MASK;
+	reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192);
+	bcmgenet_rdma_writel(priv, reg, DMA_RING16_TIMEOUT);
+
+	return 0;
+}
+
 /* standard ethtool support functions. */
 enum bcmgenet_stat_type {
 	BCMGENET_STAT_NETDEV = -1,
@@ -646,7 +793,6 @@ static void bcmgenet_get_drvinfo(struct net_device *dev,
 {
 	strlcpy(info->driver, "bcmgenet", sizeof(info->driver));
 	strlcpy(info->version, "v2.0", sizeof(info->version));
-	info->n_stats = BCMGENET_STATS_LEN;
 }
 
 static int bcmgenet_get_sset_count(struct net_device *dev, int string_set)
@@ -844,6 +990,8 @@ static struct ethtool_ops bcmgenet_ethtool_ops = {
 	.get_eee		= bcmgenet_get_eee,
 	.set_eee		= bcmgenet_set_eee,
 	.nway_reset		= bcmgenet_nway_reset,
+	.get_coalesce		= bcmgenet_get_coalesce,
+	.set_coalesce		= bcmgenet_set_coalesce,
 };
 
 /* Power down the unimac, based on mode. */
@@ -907,9 +1055,10 @@ static void bcmgenet_power_up(struct bcmgenet_priv *priv,
 	}
 
 	bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
-
-	if (mode == GENET_POWER_PASSIVE)
+	if (mode == GENET_POWER_PASSIVE) {
+		bcmgenet_phy_power_set(priv->dev, true);
 		bcmgenet_mii_reset(priv->dev);
+	}
 }
 
 /* ioctl handle special commands that are not present in ethtool. */
@@ -1230,7 +1379,6 @@ static struct sk_buff *bcmgenet_put_tx_csum(struct net_device *dev,
 		new_skb = skb_realloc_headroom(skb, sizeof(*status));
 		dev_kfree_skb(skb);
 		if (!new_skb) {
-			dev->stats.tx_errors++;
 			dev->stats.tx_dropped++;
 			return NULL;
 		}
@@ -1465,7 +1613,6 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring,
 
 		if (unlikely(!skb)) {
 			dev->stats.rx_dropped++;
-			dev->stats.rx_errors++;
 			goto next;
 		}
 
@@ -1493,7 +1640,6 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring,
 		if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
 			netif_err(priv, rx_status, dev,
 				  "dropping fragmented packet!\n");
-			dev->stats.rx_dropped++;
 			dev->stats.rx_errors++;
 			dev_kfree_skb_any(skb);
 			goto next;
@@ -1515,7 +1661,6 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring,
 				dev->stats.rx_frame_errors++;
 			if (dma_flag & DMA_RX_LG)
 				dev->stats.rx_length_errors++;
-			dev->stats.rx_dropped++;
 			dev->stats.rx_errors++;
 			dev_kfree_skb_any(skb);
 			goto next;
@@ -1688,6 +1833,24 @@ static void bcmgenet_intr_disable(struct bcmgenet_priv *priv)
 	bcmgenet_intrl2_1_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
 }
 
+static void bcmgenet_link_intr_enable(struct bcmgenet_priv *priv)
+{
+	u32 int0_enable = 0;
+
+	/* Monitor cable plug/unplugged event for internal PHY, external PHY
+	 * and MoCA PHY
+	 */
+	if (priv->internal_phy) {
+		int0_enable |= UMAC_IRQ_LINK_EVENT;
+	} else if (priv->ext_phy) {
+		int0_enable |= UMAC_IRQ_LINK_EVENT;
+	} else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
+		if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET)
+			int0_enable |= UMAC_IRQ_LINK_EVENT;
+	}
+	bcmgenet_intrl2_0_writel(priv, int0_enable, INTRL2_CPU_MASK_CLEAR);
+}
+
 static int init_umac(struct bcmgenet_priv *priv)
 {
 	struct device *kdev = &priv->pdev->dev;
@@ -1728,15 +1891,8 @@ static int init_umac(struct bcmgenet_priv *priv)
 	/* Enable Tx default queue 16 interrupts */
 	int0_enable |= UMAC_IRQ_TXDMA_DONE;
 
-	/* Monitor cable plug/unplugged event for internal PHY */
-	if (phy_is_internal(priv->phydev)) {
-		int0_enable |= UMAC_IRQ_LINK_EVENT;
-	} else if (priv->ext_phy) {
-		int0_enable |= UMAC_IRQ_LINK_EVENT;
-	} else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
-		if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET)
-			int0_enable |= UMAC_IRQ_LINK_EVENT;
-
+	/* Configure backpressure vectors for MoCA */
+	if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
 		reg = bcmgenet_bp_mc_get(priv);
 		reg |= BIT(priv->hw_params->bp_in_en_shift);
 
@@ -2130,6 +2286,8 @@ static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
 	int ret = 0;
 	int timeout = 0;
 	u32 reg;
+	u32 dma_ctrl;
+	int i;
 
 	/* Disable TDMA to stop add more frames in TX DMA */
 	reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
@@ -2173,6 +2331,20 @@ static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
 		ret = -ETIMEDOUT;
 	}
 
+	dma_ctrl = 0;
+	for (i = 0; i < priv->hw_params->rx_queues; i++)
+		dma_ctrl |= (1 << (i + DMA_RING_BUF_EN_SHIFT));
+	reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
+	reg &= ~dma_ctrl;
+	bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
+
+	dma_ctrl = 0;
+	for (i = 0; i < priv->hw_params->tx_queues; i++)
+		dma_ctrl |= (1 << (i + DMA_RING_BUF_EN_SHIFT));
+	reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
+	reg &= ~dma_ctrl;
+	bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
+
 	return ret;
 }
 
@@ -2393,6 +2565,23 @@ static irqreturn_t bcmgenet_wol_isr(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void bcmgenet_poll_controller(struct net_device *dev)
+{
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+
+	/* Invoke the main RX/TX interrupt handler */
+	disable_irq(priv->irq0);
+	bcmgenet_isr0(priv->irq0, priv);
+	enable_irq(priv->irq0);
+
+	/* And the interrupt handler for RX/TX priority queues */
+	disable_irq(priv->irq1);
+	bcmgenet_isr1(priv->irq1, priv);
+	enable_irq(priv->irq1);
+}
+#endif
+
 static void bcmgenet_umac_reset(struct bcmgenet_priv *priv)
 {
 	u32 reg;
@@ -2617,6 +2806,9 @@ static void bcmgenet_netif_start(struct net_device *dev)
 
 	netif_tx_start_all_queues(dev);
 
+	/* Monitor link interrupts now */
+	bcmgenet_link_intr_enable(priv);
+
 	phy_start(priv->phydev);
 }
 
@@ -2630,13 +2822,12 @@ static int bcmgenet_open(struct net_device *dev)
 	netif_dbg(priv, ifup, dev, "bcmgenet_open\n");
 
 	/* Turn on the clock */
-	if (!IS_ERR(priv->clk))
-		clk_prepare_enable(priv->clk);
+	clk_prepare_enable(priv->clk);
 
 	/* If this is an internal GPHY, power it back on now, before UniMAC is
 	 * brought out of reset as absolutely no UniMAC activity is allowed
 	 */
-	if (phy_is_internal(priv->phydev))
+	if (priv->internal_phy)
 		bcmgenet_power_up(priv, GENET_POWER_PASSIVE);
 
 	/* take MAC out of reset */
@@ -2655,7 +2846,7 @@ static int bcmgenet_open(struct net_device *dev)
 
 	bcmgenet_set_hw_addr(priv, dev->dev_addr);
 
-	if (phy_is_internal(priv->phydev)) {
+	if (priv->internal_phy) {
 		reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 		reg |= EXT_ENERGY_DET_MASK;
 		bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
@@ -2691,23 +2882,24 @@ static int bcmgenet_open(struct net_device *dev)
 		goto err_irq0;
 	}
 
-	/* Re-configure the port multiplexer towards the PHY device */
-	bcmgenet_mii_config(priv->dev, false);
-
-	phy_connect_direct(dev, priv->phydev, bcmgenet_mii_setup,
-			   priv->phy_interface);
+	ret = bcmgenet_mii_probe(dev);
+	if (ret) {
+		netdev_err(dev, "failed to connect to PHY\n");
+		goto err_irq1;
+	}
 
 	bcmgenet_netif_start(dev);
 
 	return 0;
 
+err_irq1:
+	free_irq(priv->irq1, priv);
 err_irq0:
-	free_irq(priv->irq0, dev);
+	free_irq(priv->irq0, priv);
 err_fini_dma:
 	bcmgenet_fini_dma(priv);
 err_clk_disable:
-	if (!IS_ERR(priv->clk))
-		clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk);
 	return ret;
 }
 
@@ -2761,21 +2953,83 @@ static int bcmgenet_close(struct net_device *dev)
 	free_irq(priv->irq0, priv);
 	free_irq(priv->irq1, priv);
 
-	if (phy_is_internal(priv->phydev))
+	if (priv->internal_phy)
 		ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
 
-	if (!IS_ERR(priv->clk))
-		clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk);
 
 	return ret;
 }
 
+static void bcmgenet_dump_tx_queue(struct bcmgenet_tx_ring *ring)
+{
+	struct bcmgenet_priv *priv = ring->priv;
+	u32 p_index, c_index, intsts, intmsk;
+	struct netdev_queue *txq;
+	unsigned int free_bds;
+	unsigned long flags;
+	bool txq_stopped;
+
+	if (!netif_msg_tx_err(priv))
+		return;
+
+	txq = netdev_get_tx_queue(priv->dev, ring->queue);
+
+	spin_lock_irqsave(&ring->lock, flags);
+	if (ring->index == DESC_INDEX) {
+		intsts = ~bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
+		intmsk = UMAC_IRQ_TXDMA_DONE | UMAC_IRQ_TXDMA_MBDONE;
+	} else {
+		intsts = ~bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_MASK_STATUS);
+		intmsk = 1 << ring->index;
+	}
+	c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX);
+	p_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_PROD_INDEX);
+	txq_stopped = netif_tx_queue_stopped(txq);
+	free_bds = ring->free_bds;
+	spin_unlock_irqrestore(&ring->lock, flags);
+
+	netif_err(priv, tx_err, priv->dev, "Ring %d queue %d status summary\n"
+		  "TX queue status: %s, interrupts: %s\n"
+		  "(sw)free_bds: %d (sw)size: %d\n"
+		  "(sw)p_index: %d (hw)p_index: %d\n"
+		  "(sw)c_index: %d (hw)c_index: %d\n"
+		  "(sw)clean_p: %d (sw)write_p: %d\n"
+		  "(sw)cb_ptr: %d (sw)end_ptr: %d\n",
+		  ring->index, ring->queue,
+		  txq_stopped ? "stopped" : "active",
+		  intsts & intmsk ? "enabled" : "disabled",
+		  free_bds, ring->size,
+		  ring->prod_index, p_index & DMA_P_INDEX_MASK,
+		  ring->c_index, c_index & DMA_C_INDEX_MASK,
+		  ring->clean_ptr, ring->write_ptr,
+		  ring->cb_ptr, ring->end_ptr);
+}
+
 static void bcmgenet_timeout(struct net_device *dev)
 {
 	struct bcmgenet_priv *priv = netdev_priv(dev);
+	u32 int0_enable = 0;
+	u32 int1_enable = 0;
+	unsigned int q;
 
 	netif_dbg(priv, tx_err, dev, "bcmgenet_timeout\n");
 
+	for (q = 0; q < priv->hw_params->tx_queues; q++)
+		bcmgenet_dump_tx_queue(&priv->tx_rings[q]);
+	bcmgenet_dump_tx_queue(&priv->tx_rings[DESC_INDEX]);
+
+	bcmgenet_tx_reclaim_all(dev);
+
+	for (q = 0; q < priv->hw_params->tx_queues; q++)
+		int1_enable |= (1 << q);
+
+	int0_enable = UMAC_IRQ_TXDMA_DONE;
+
+	/* Re-enable TX interrupts if disabled */
+	bcmgenet_intrl2_0_writel(priv, int0_enable, INTRL2_CPU_MASK_CLEAR);
+	bcmgenet_intrl2_1_writel(priv, int1_enable, INTRL2_CPU_MASK_CLEAR);
+
 	dev->trans_start = jiffies;
 
 	dev->stats.tx_errors++;
@@ -2878,6 +3132,9 @@ static const struct net_device_ops bcmgenet_netdev_ops = {
 	.ndo_set_mac_address	= bcmgenet_set_mac_addr,
 	.ndo_do_ioctl		= bcmgenet_ioctl,
 	.ndo_set_features	= bcmgenet_set_features,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= bcmgenet_poll_controller,
+#endif
 };
 
 /* Array of GENET hardware parameters/characteristics */
@@ -3062,6 +3319,7 @@ static const struct of_device_id bcmgenet_match[] = {
 	{ .compatible = "brcm,genet-v4", .data = (void *)GENET_V4 },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, bcmgenet_match);
 
 static int bcmgenet_probe(struct platform_device *pdev)
 {
@@ -3151,11 +3409,12 @@ static int bcmgenet_probe(struct platform_device *pdev)
 		priv->version = pd->genet_version;
 
 	priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
-	if (IS_ERR(priv->clk))
+	if (IS_ERR(priv->clk)) {
 		dev_warn(&priv->pdev->dev, "failed to get enet clock\n");
+		priv->clk = NULL;
+	}
 
-	if (!IS_ERR(priv->clk))
-		clk_prepare_enable(priv->clk);
+	clk_prepare_enable(priv->clk);
 
 	bcmgenet_set_hw_params(priv);
 
@@ -3166,8 +3425,10 @@ static int bcmgenet_probe(struct platform_device *pdev)
 	INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
 
 	priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
-	if (IS_ERR(priv->clk_wol))
+	if (IS_ERR(priv->clk_wol)) {
 		dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");
+		priv->clk_wol = NULL;
+	}
 
 	priv->clk_eee = devm_clk_get(&priv->pdev->dev, "enet-eee");
 	if (IS_ERR(priv->clk_eee)) {
@@ -3193,8 +3454,7 @@ static int bcmgenet_probe(struct platform_device *pdev)
 	netif_carrier_off(dev);
 
 	/* Turn off the main clock, WOL clock is handled separately */
-	if (!IS_ERR(priv->clk))
-		clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk);
 
 	err = register_netdev(dev);
 	if (err)
@@ -3203,8 +3463,7 @@ static int bcmgenet_probe(struct platform_device *pdev)
 	return err;
 
 err_clk_disable:
-	if (!IS_ERR(priv->clk))
-		clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk);
 err:
 	free_netdev(dev);
 	return err;
@@ -3256,7 +3515,7 @@ static int bcmgenet_suspend(struct device *d)
 	if (device_may_wakeup(d) && priv->wolopts) {
 		ret = bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
 		clk_prepare_enable(priv->clk_wol);
-	} else if (phy_is_internal(priv->phydev)) {
+	} else if (priv->internal_phy) {
 		ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
 	}
 
@@ -3285,7 +3544,7 @@ static int bcmgenet_resume(struct device *d)
 	/* If this is an internal GPHY, power it back on now, before UniMAC is
 	 * brought out of reset as absolutely no UniMAC activity is allowed
 	 */
-	if (phy_is_internal(priv->phydev))
+	if (priv->internal_phy)
 		bcmgenet_power_up(priv, GENET_POWER_PASSIVE);
 
 	bcmgenet_umac_reset(priv);
@@ -3300,14 +3559,14 @@ static int bcmgenet_resume(struct device *d)
 
 	phy_init_hw(priv->phydev);
 	/* Speed settings must be restored */
-	bcmgenet_mii_config(priv->dev, false);
+	bcmgenet_mii_config(priv->dev);
 
 	/* disable ethernet MAC while updating its registers */
 	umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);
 
 	bcmgenet_set_hw_addr(priv, dev->dev_addr);
 
-	if (phy_is_internal(priv->phydev)) {
+	if (priv->internal_phy) {
 		reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 		reg |= EXT_ENERGY_DET_MASK;
 		bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
diff --git a/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.h
index 6f2887a5e..967367557 100644
--- a/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.h
+++ b/kernel/drivers/net/ethernet/broadcom/genet/bcmgenet.h
@@ -304,13 +304,12 @@ struct bcmgenet_mib_counters {
 #define UMAC_IRQ_RXDMA_MBDONE		(1 << 13)
 #define UMAC_IRQ_RXDMA_PDONE		(1 << 14)
 #define UMAC_IRQ_RXDMA_BDONE		(1 << 15)
-#define UMAC_IRQ_RXDMA_DONE		(UMAC_IRQ_RXDMA_PDONE | \
-					 UMAC_IRQ_RXDMA_BDONE)
+#define UMAC_IRQ_RXDMA_DONE		UMAC_IRQ_RXDMA_MBDONE
 #define UMAC_IRQ_TXDMA_MBDONE		(1 << 16)
 #define UMAC_IRQ_TXDMA_PDONE		(1 << 17)
 #define UMAC_IRQ_TXDMA_BDONE		(1 << 18)
-#define UMAC_IRQ_TXDMA_DONE		(UMAC_IRQ_TXDMA_PDONE | \
-					 UMAC_IRQ_TXDMA_BDONE)
+#define UMAC_IRQ_TXDMA_DONE		UMAC_IRQ_TXDMA_MBDONE
+
 /* Only valid for GENETv3+ */
 #define UMAC_IRQ_MDIO_DONE		(1 << 23)
 #define UMAC_IRQ_MDIO_ERROR		(1 << 24)
@@ -386,7 +385,7 @@ struct bcmgenet_mib_counters {
 #define DMA_RING_BUFFER_SIZE_MASK	0xFFFF
 
 /* DMA interrupt threshold register */
-#define DMA_INTR_THRESHOLD_MASK		0x00FF
+#define DMA_INTR_THRESHOLD_MASK		0x01FF
 
 /* DMA XON/XOFF register */
 #define DMA_XON_THREHOLD_MASK		0xFFFF
@@ -593,7 +592,9 @@ struct bcmgenet_priv {
 	/* MDIO bus variables */
 	wait_queue_head_t wq;
 	struct phy_device *phydev;
+	bool internal_phy;
 	struct device_node *phy_dn;
+	struct device_node *mdio_dn;
 	struct mii_bus *mii_bus;
 	u16 gphy_rev;
 	struct clk *clk_eee;
@@ -669,7 +670,8 @@ GENET_IO_MACRO(rbuf, GENET_RBUF_OFF);
 
 /* MDIO routines */
 int bcmgenet_mii_init(struct net_device *dev);
-int bcmgenet_mii_config(struct net_device *dev, bool init);
+int bcmgenet_mii_config(struct net_device *dev);
+int bcmgenet_mii_probe(struct net_device *dev);
 void bcmgenet_mii_exit(struct net_device *dev);
 void bcmgenet_mii_reset(struct net_device *dev);
 void bcmgenet_phy_power_set(struct net_device *dev, bool enable);
diff --git a/kernel/drivers/net/ethernet/broadcom/genet/bcmmii.c b/kernel/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 420949cc5..8bdfe5375 100644
--- a/kernel/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/kernel/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -47,7 +47,12 @@ static int bcmgenet_mii_read(struct mii_bus *bus, int phy_id, int location)
 			   HZ / 100);
 	ret = bcmgenet_umac_readl(priv, UMAC_MDIO_CMD);
 
-	if (ret & MDIO_READ_FAIL)
+	/* Some broken devices are known not to release the line during
+	 * turn-around, e.g: Broadcom BCM53125 external switches, so check for
+	 * that condition here and ignore the MDIO controller read failure
+	 * indication.
+	 */
+	if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (ret & MDIO_READ_FAIL))
 		return -EIO;
 
 	return ret & 0xffff;
@@ -158,10 +163,26 @@ void bcmgenet_mii_setup(struct net_device *dev)
 	phy_print_status(phydev);
 }
 
+
+static int bcmgenet_fixed_phy_link_update(struct net_device *dev,
+					  struct fixed_phy_status *status)
+{
+	if (dev && dev->phydev && status)
+		status->link = dev->phydev->link;
+
+	return 0;
+}
+
+/* Perform a voluntary PHY software reset, since the EPHY is very finicky about
+ * not doing it and will start corrupting packets
+ */
 void bcmgenet_mii_reset(struct net_device *dev)
 {
 	struct bcmgenet_priv *priv = netdev_priv(dev);
 
+	if (GENET_IS_V4(priv))
+		return;
+
 	if (priv->phydev) {
 		phy_init_hw(priv->phydev);
 		phy_start_aneg(priv->phydev);
@@ -221,9 +242,13 @@ static void bcmgenet_moca_phy_setup(struct bcmgenet_priv *priv)
 	reg = bcmgenet_sys_readl(priv, SYS_PORT_CTRL);
 	reg |= LED_ACT_SOURCE_MAC;
 	bcmgenet_sys_writel(priv, reg, SYS_PORT_CTRL);
+
+	if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET)
+		fixed_phy_set_link_update(priv->phydev,
+					  bcmgenet_fixed_phy_link_update);
 }
 
-int bcmgenet_mii_config(struct net_device *dev, bool init)
+int bcmgenet_mii_config(struct net_device *dev)
 {
 	struct bcmgenet_priv *priv = netdev_priv(dev);
 	struct phy_device *phydev = priv->phydev;
@@ -233,10 +258,10 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 	u32 port_ctrl;
 	u32 reg;
 
-	priv->ext_phy = !phy_is_internal(priv->phydev) &&
+	priv->ext_phy = !priv->internal_phy &&
 			(priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
 
-	if (phy_is_internal(priv->phydev))
+	if (priv->internal_phy)
 		priv->phy_interface = PHY_INTERFACE_MODE_NA;
 
 	switch (priv->phy_interface) {
@@ -254,7 +279,7 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 
 		bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
 
-		if (phy_is_internal(priv->phydev)) {
+		if (priv->internal_phy) {
 			phy_name = "internal PHY";
 			bcmgenet_internal_phy_setup(dev);
 		} else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
@@ -316,13 +341,12 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 		bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 	}
 
-	if (init)
-		dev_info(kdev, "configuring instance for %s\n", phy_name);
+	dev_info_once(kdev, "configuring instance for %s\n", phy_name);
 
 	return 0;
 }
 
-static int bcmgenet_mii_probe(struct net_device *dev)
+int bcmgenet_mii_probe(struct net_device *dev)
 {
 	struct bcmgenet_priv *priv = netdev_priv(dev);
 	struct device_node *dn = priv->pdev->dev.of_node;
@@ -340,22 +364,6 @@ static int bcmgenet_mii_probe(struct net_device *dev)
 	priv->old_pause = -1;
 
 	if (dn) {
-		if (priv->phydev) {
-			pr_info("PHY already attached\n");
-			return 0;
-		}
-
-		/* In the case of a fixed PHY, the DT node associated
-		 * to the PHY is the Ethernet MAC DT node.
-		 */
-		if (!priv->phy_dn && of_phy_is_fixed_link(dn)) {
-			ret = of_phy_register_fixed_link(dn);
-			if (ret)
-				return ret;
-
-			priv->phy_dn = of_node_get(dn);
-		}
-
 		phydev = of_phy_connect(dev, priv->phy_dn, bcmgenet_mii_setup,
 					phy_flags, priv->phy_interface);
 		if (!phydev) {
@@ -381,7 +389,7 @@ static int bcmgenet_mii_probe(struct net_device *dev)
 	 * PHY speed which is needed for bcmgenet_mii_config() to configure
 	 * things appropriately.
 	 */
-	ret = bcmgenet_mii_config(dev, true);
+	ret = bcmgenet_mii_config(dev);
 	if (ret) {
 		phy_disconnect(priv->phydev);
 		return ret;
@@ -392,13 +400,56 @@ static int bcmgenet_mii_probe(struct net_device *dev)
 	/* The internal PHY has its link interrupts routed to the
 	 * Ethernet MAC ISRs
 	 */
-	if (phy_is_internal(priv->phydev))
+	if (priv->internal_phy)
 		priv->mii_bus->irq[phydev->addr] = PHY_IGNORE_INTERRUPT;
 	else
 		priv->mii_bus->irq[phydev->addr] = PHY_POLL;
 
-	pr_info("attached PHY at address %d [%s]\n",
-		phydev->addr, phydev->drv->name);
+	return 0;
+}
+
+/* Workaround for integrated BCM7xxx Gigabit PHYs which have a problem with
+ * their internal MDIO management controller making them fail to successfully
+ * be read from or written to for the first transaction.  We insert a dummy
+ * BMSR read here to make sure that phy_get_device() and get_phy_id() can
+ * correctly read the PHY MII_PHYSID1/2 registers and successfully register a
+ * PHY device for this peripheral.
+ *
+ * Once the PHY driver is registered, we can workaround subsequent reads from
+ * there (e.g: during system-wide power management).
+ *
+ * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
+ * therefore the right location to stick that workaround. Since we do not want
+ * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
+ * Device Tree scan to limit the search area.
+ */
+static int bcmgenet_mii_bus_reset(struct mii_bus *bus)
+{
+	struct net_device *dev = bus->priv;
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+	struct device_node *np = priv->mdio_dn;
+	struct device_node *child = NULL;
+	u32 read_mask = 0;
+	int addr = 0;
+
+	if (!np) {
+		read_mask = 1 << priv->phy_addr;
+	} else {
+		for_each_available_child_of_node(np, child) {
+			addr = of_mdio_parse_addr(&dev->dev, child);
+			if (addr < 0)
+				continue;
+
+			read_mask |= 1 << addr;
+		}
+	}
+
+	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
+		if (read_mask & 1 << addr) {
+			dev_dbg(&dev->dev, "Workaround for PHY @ %d\n", addr);
+			mdiobus_read(bus, addr, MII_BMSR);
+		}
+	}
 
 	return 0;
 }
@@ -422,6 +473,7 @@ static int bcmgenet_mii_alloc(struct bcmgenet_priv *priv)
 	bus->parent = &priv->pdev->dev;
 	bus->read = bcmgenet_mii_read;
 	bus->write = bcmgenet_mii_write;
+	bus->reset = bcmgenet_mii_bus_reset;
 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d",
 		 priv->pdev->name, priv->pdev->id);
 
@@ -438,22 +490,24 @@ static int bcmgenet_mii_of_init(struct bcmgenet_priv *priv)
 {
 	struct device_node *dn = priv->pdev->dev.of_node;
 	struct device *kdev = &priv->pdev->dev;
-	struct device_node *mdio_dn;
+	const char *phy_mode_str = NULL;
+	struct phy_device *phydev = NULL;
 	char *compat;
+	int phy_mode;
 	int ret;
 
 	compat = kasprintf(GFP_KERNEL, "brcm,genet-mdio-v%d", priv->version);
 	if (!compat)
 		return -ENOMEM;
 
-	mdio_dn = of_find_compatible_node(dn, NULL, compat);
+	priv->mdio_dn = of_find_compatible_node(dn, NULL, compat);
 	kfree(compat);
-	if (!mdio_dn) {
+	if (!priv->mdio_dn) {
 		dev_err(kdev, "unable to find MDIO bus node\n");
 		return -ENODEV;
 	}
 
-	ret = of_mdiobus_register(priv->mii_bus, mdio_dn);
+	ret = of_mdiobus_register(priv->mii_bus, priv->mdio_dn);
 	if (ret) {
 		dev_err(kdev, "failed to register MDIO bus\n");
 		return ret;
@@ -462,17 +516,43 @@ static int bcmgenet_mii_of_init(struct bcmgenet_priv *priv)
 	/* Fetch the PHY phandle */
 	priv->phy_dn = of_parse_phandle(dn, "phy-handle", 0);
 
+	/* In the case of a fixed PHY, the DT node associated
+	 * to the PHY is the Ethernet MAC DT node.
+	 */
+	if (!priv->phy_dn && of_phy_is_fixed_link(dn)) {
+		ret = of_phy_register_fixed_link(dn);
+		if (ret)
+			return ret;
+
+		priv->phy_dn = of_node_get(dn);
+	}
+
 	/* Get the link mode */
-	priv->phy_interface = of_get_phy_mode(dn);
+	phy_mode = of_get_phy_mode(dn);
+	priv->phy_interface = phy_mode;
 
-	return 0;
-}
+	/* We need to specifically look up whether this PHY interface is internal
+	 * or not *before* we even try to probe the PHY driver over MDIO as we
+	 * may have shut down the internal PHY for power saving purposes.
+	 */
+	if (phy_mode < 0) {
+		ret = of_property_read_string(dn, "phy-mode", &phy_mode_str);
+		if (ret < 0) {
+			dev_err(kdev, "invalid PHY mode property\n");
+			return ret;
+		}
 
-static int bcmgenet_fixed_phy_link_update(struct net_device *dev,
-					  struct fixed_phy_status *status)
-{
-	if (dev && dev->phydev && status)
-		status->link = dev->phydev->link;
+		priv->phy_interface = PHY_INTERFACE_MODE_NA;
+		if (!strcasecmp(phy_mode_str, "internal"))
+			priv->internal_phy = true;
+	}
+
+	/* Make sure we initialize MoCA PHYs with a link down */
+	if (phy_mode == PHY_INTERFACE_MODE_MOCA) {
+		phydev = of_phy_find_device(dn);
+		if (phydev)
+			phydev->link = 0;
+	}
 
 	return 0;
 }
@@ -523,18 +603,15 @@ static int bcmgenet_mii_pd_init(struct bcmgenet_priv *priv)
 			.asym_pause = 0,
 		};
 
-		phydev = fixed_phy_register(PHY_POLL, &fphy_status, NULL);
+		phydev = fixed_phy_register(PHY_POLL, &fphy_status, -1, NULL);
 		if (!phydev || IS_ERR(phydev)) {
 			dev_err(kdev, "failed to register fixed PHY device\n");
 			return -ENODEV;
 		}
 
-		if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET) {
-			ret = fixed_phy_set_link_update(
-				phydev, bcmgenet_fixed_phy_link_update);
-			if (!ret)
-				phydev->link = 0;
-		}
+		/* Make sure we initialize MoCA PHYs with a link down */
+		phydev->link = 0;
+
 	}
 
 	priv->phydev = phydev;
@@ -564,10 +641,6 @@ int bcmgenet_mii_init(struct net_device *dev)
 
 	ret = bcmgenet_mii_bus_init(priv);
 	if (ret)
-		goto out_free;
-
-	ret = bcmgenet_mii_probe(dev);
-	if (ret)
 		goto out;
 
 	return 0;
@@ -575,7 +648,6 @@ int bcmgenet_mii_init(struct net_device *dev)
 out:
 	of_node_put(priv->phy_dn);
 	mdiobus_unregister(priv->mii_bus);
-out_free:
 	kfree(priv->mii_bus->irq);
 	mdiobus_free(priv->mii_bus);
 	return ret;