2 files changed, 31 insertions, 2 deletions

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 2b0a0ea4f8e7..ae236009f1a8 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -259,6 +259,7 @@ struct bufdesc_ex {
 struct fec_enet_delayed_work {
         struct delayed_work delay_work;
         bool timeout;
+        bool trig_tx;
 };
 
 /* The FEC buffer descriptors track the ring buffers.  The rx_bd_base and
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index f0f0e96453a0..0dda45481d16 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -93,6 +93,20 @@ static void set_multicast_list(struct net_device *ndev);
 #define FEC_QUIRK_HAS_CSUM              (1 << 5)
 /* Controller has hardware vlan support */
 #define FEC_QUIRK_HAS_VLAN              (1 << 6)
+/* ENET IP errata ERR006358
+ *
+ * If the ready bit in the transmit buffer descriptor (TxBD[R]) is previously
+ * detected as not set during a prior frame transmission, then the
+ * ENET_TDAR[TDAR] bit is cleared at a later time, even if additional TxBDs
+ * were added to the ring and the ENET_TDAR[TDAR] bit is set. This results in
+ * If the ready bit in the transmit buffer descriptor (TxBD[R]) is previously
+ * detected as not set during a prior frame transmission, then the
+ * ENET_TDAR[TDAR] bit is cleared at a later time, even if additional TxBDs
+ * were added to the ring and the ENET_TDAR[TDAR] bit is set. This results in
+ * frames not being transmitted until there is a 0-to-1 transition on
+ * ENET_TDAR[TDAR].
+ */
+#define FEC_QUIRK_ERR006358            (1 << 7)
 
 static struct platform_device_id fec_devtype[] = {
         {
@@ -112,7 +126,7 @@ static struct platform_device_id fec_devtype[] = {
                 .name = "imx6q-fec",
                 .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
                                 FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |
-                                FEC_QUIRK_HAS_VLAN,
+                                FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358,
         }, {
                 .name = "mvf600-fec",
                 .driver_data = FEC_QUIRK_ENET_MAC,
@@ -275,7 +289,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
         struct fec_enet_private *fep = netdev_priv(ndev);
         const struct platform_device_id *id_entry =
                                 platform_get_device_id(fep->pdev);
-        struct bufdesc *bdp;
+        struct bufdesc *bdp, *bdp_pre;
         void *bufaddr;
         unsigned short  status;
         unsigned int index;
@@ -370,6 +384,15 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
                                 ebdp->cbd_esc |= BD_ENET_TX_PINS;
                 }
         }
+
+        bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
+        if ((id_entry->driver_data & FEC_QUIRK_ERR006358) &&
+            !(bdp_pre->cbd_sc & BD_ENET_TX_READY)) {
+                fep->delay_work.trig_tx = true;
+                schedule_delayed_work(&(fep->delay_work.delay_work),
+                                        msecs_to_jiffies(1));
+        }
+
         /* If this was the last BD in the ring, start at the beginning again. */
         if (status & BD_ENET_TX_WRAP)
                 bdp = fep->tx_bd_base;
@@ -689,6 +712,11 @@ static void fec_enet_work(struct work_struct *work)
                 fec_restart(fep->netdev, fep->full_duplex);
                 netif_wake_queue(fep->netdev);
         }
+
+        if (fep->delay_work.trig_tx) {
+                fep->delay_work.trig_tx = false;
+                writel(0, fep->hwp + FEC_X_DES_ACTIVE);
+        }
 }
 
 static void