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phy: make some bits preserved while setup forced mode 

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.

The BMCR_LOOPBACK bit should be preserved.

As Florian pointed out that other bits should be preserved too.
So I make the BMCR_ISOLATE and BMCR_PDOWN as well.

Signed-off-by: Weidong Wang <wangweidong1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wangweidong 2016-04-14 15:43:52 +08:00 committed by David S. Miller
parent 4e811b1e11
commit f48256efed
1 changed files with 2 additions and 1 deletions
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3
drivers/net/phy/phy_device.c
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@ -1123,8 +1123,9 @@ static int genphy_config_advert(struct phy_device *phydev)
*/
int genphy_setup_forced(struct phy_device *phydev)
{
int ctl = 0;
int ctl = phy_read(phydev, MII_BMCR);
ctl &= BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN;
phydev->pause = 0;
phydev->asym_pause = 0;