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>
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index e551f3a..10e39c2 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1123,8 +1123,9 @@
*/
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;