pch_gbe: fixed the issue which receives an unnecessary packet.

This patch fixed the issue which receives an unnecessary packet before link

When using PHY of GMII, an unnecessary packet is received,
And it becomes impossible to receive a packet after link up.

Signed-off-by: Toshiharu Okada <toshiharu-linux@dsn.okisemi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/pch_gbe/pch_gbe_main.c

@@ -717,13 +717,6 @@ static void pch_gbe_configure_rx(struct pch_gbe_adapter *adapter)
 	iowrite32(rdba, &hw->reg->RX_DSC_BASE);
 	iowrite32(rdlen, &hw->reg->RX_DSC_SIZE);
 	iowrite32((rdba + rdlen), &hw->reg->RX_DSC_SW_P);
-
-	/* Enables Receive DMA */
-	rxdma = ioread32(&hw->reg->DMA_CTRL);
-	rxdma |= PCH_GBE_RX_DMA_EN;
-	iowrite32(rxdma, &hw->reg->DMA_CTRL);
-	/* Enables Receive */
-	iowrite32(PCH_GBE_MRE_MAC_RX_EN, &hw->reg->MAC_RX_EN);
 }
 
 /**
@@ -1097,6 +1090,19 @@ void pch_gbe_update_stats(struct pch_gbe_adapter *adapter)
 	spin_unlock_irqrestore(&adapter->stats_lock, flags);
 }
 
+static void pch_gbe_start_receive(struct pch_gbe_hw *hw)
+{
+	u32 rxdma;
+
+	/* Enables Receive DMA */
+	rxdma = ioread32(&hw->reg->DMA_CTRL);
+	rxdma |= PCH_GBE_RX_DMA_EN;
+	iowrite32(rxdma, &hw->reg->DMA_CTRL);
+	/* Enables Receive */
+	iowrite32(PCH_GBE_MRE_MAC_RX_EN, &hw->reg->MAC_RX_EN);
+	return;
+}
+
 /**
  * pch_gbe_intr - Interrupt Handler
  * @irq:   Interrupt number
@@ -1717,6 +1723,7 @@ int pch_gbe_up(struct pch_gbe_adapter *adapter)
 	pch_gbe_alloc_tx_buffers(adapter, tx_ring);
 	pch_gbe_alloc_rx_buffers(adapter, rx_ring, rx_ring->count);
 	adapter->tx_queue_len = netdev->tx_queue_len;
+	pch_gbe_start_receive(&adapter->hw);
 
 	mod_timer(&adapter->watchdog_timer, jiffies);