[RESEND PATCH net-next] phy: keep the BCMR_LOOPBACK bit while setup forced mode

[Weidong Wang]

When tested the PHY SGMII Loopback,:
1.set the LOOPBACK bit,
2.set the autoneg to AUTONEG_DISABLE, it calls the
genphy_setup_forced which will clear the bit.

So just keep the LOOPBACK bit while setup forced mode.

Signed-off-by: Weidong Wang <wangweido...@huawei.com>
---
 drivers/net/phy/phy_device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index e551f3a..8da4b80 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1124,7 +1124,9 @@ static int genphy_config_advert(struct phy_device *phydev)
 int genphy_setup_forced(struct phy_device *phydev)
 {
        int ctl = 0;
+       int val = phy_read(phydev, MII_BMCR);

+       ctl |= val & BMCR_LOOPBACK;
        phydev->pause = 0;
        phydev->asym_pause = 0;

-- 2.7.0