net/hns:bugfix of ethtool -t phy self_test

This patch fixes the phy loopback self_test failed issue. when
Marvell Phy Module is loaded, it will powerdown fiber when doing
phy loopback self test, which cause phy loopback self_test fail.
Signed-off-by: NLin Yun Sheng <linyunsheng@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns/hns_ethtool.c

@@ -288,9 +288,15 @@ static int hns_nic_config_phy_loopback(struct phy_device *phy_dev, u8 en)
 
 		/* Force 1000M Link, Default is 0x0200 */
 		phy_write(phy_dev, 7, 0x20C);
-		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
 
-		/* Enable PHY loop-back */
+		/* Powerup Fiber */
+		phy_write(phy_dev, HNS_PHY_PAGE_REG, 1);
+		val = phy_read(phy_dev, COPPER_CONTROL_REG);
+		val &= ~PHY_POWER_DOWN;
+		phy_write(phy_dev, COPPER_CONTROL_REG, val);
+
+		/* Enable Phy Loopback */
+		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
 		val = phy_read(phy_dev, COPPER_CONTROL_REG);
 		val |= PHY_LOOP_BACK;
 		val &= ~PHY_POWER_DOWN;
@@ -299,6 +305,12 @@ static int hns_nic_config_phy_loopback(struct phy_device *phy_dev, u8 en)
 		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0xFA);
 		phy_write(phy_dev, 1, 0x400);
 		phy_write(phy_dev, 7, 0x200);
+
+		phy_write(phy_dev, HNS_PHY_PAGE_REG, 1);
+		val = phy_read(phy_dev, COPPER_CONTROL_REG);
+		val |= PHY_POWER_DOWN;
+		phy_write(phy_dev, COPPER_CONTROL_REG, val);
+
 		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
 		phy_write(phy_dev, 9, 0xF00);