net/pch_gpe: Cannot disable ethernet autonegation

When attempting to disable ethernet autonegation via ethtool,
the pch_gpe driver will set software reset bit of PHY chip, But
control register of PHY chip of FRI2 will reenable ethernet autonegation.

Signed-off-by: Wei Yang <w90p710@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_ethtool.c

@@ -129,7 +129,6 @@ static int pch_gbe_set_settings(struct net_device *netdev,
 	hw->mac.link_duplex = ecmd->duplex;
 	hw->phy.autoneg_advertised = ecmd->advertising;
 	hw->mac.autoneg = ecmd->autoneg;
-	pch_gbe_hal_phy_sw_reset(hw);
 
 	/* reset the link */
 	if (netif_running(adapter->netdev)) {

drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c

@@ -1988,6 +1988,7 @@ int pch_gbe_up(struct pch_gbe_adapter *adapter)
 void pch_gbe_down(struct pch_gbe_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
 	struct pch_gbe_rx_ring *rx_ring = adapter->rx_ring;
 
 	/* signal that we're down so the interrupt handler does not
@@ -2004,7 +2005,8 @@ void pch_gbe_down(struct pch_gbe_adapter *adapter)
 	netif_carrier_off(netdev);
 	netif_stop_queue(netdev);
 
-	pch_gbe_reset(adapter);
+	if ((pdev->error_state) && (pdev->error_state != pci_channel_io_normal))
+		pch_gbe_reset(adapter);
 	pch_gbe_clean_tx_ring(adapter, adapter->tx_ring);
 	pch_gbe_clean_rx_ring(adapter, adapter->rx_ring);