[PATCH 14/16] net: phy: adin: make sure down-speed auto-neg is enabled

Alexandru Ardelean
2019-08-05T13:55:51Z

Down-speed auto-negotiation may not always be enabled, in which case the
PHY won't down-shift to 100 or 10 during auto-negotiation.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
drivers/net/phy/adin.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index 86848444bd98..a1f3456a8504 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -32,6 +32,13 @@
#define ADIN1300_NRG_PD_TX_EN BIT(2)
#define ADIN1300_NRG_PD_STATUS BIT(1)

+#define ADIN1300_PHY_CTRL2 0x0016
+#define ADIN1300_DOWNSPEED_AN_100_EN BIT(11)
+#define ADIN1300_DOWNSPEED_AN_10_EN BIT(10)
+#define ADIN1300_GROUP_MDIO_EN BIT(6)
+#define ADIN1300_DOWNSPEEDS_EN \
+ (ADIN1300_DOWNSPEED_AN_100_EN | ADIN1300_DOWNSPEED_AN_10_EN)
+
#define ADIN1300_INT_MASK_REG 0x0018
#define ADIN1300_INT_MDIO_SYNC_EN BIT(9)
#define ADIN1300_INT_ANEG_STAT_CHNG_EN BIT(8)
@@ -425,6 +432,22 @@ static int adin_config_mdix(struct phy_device *phydev)
return phy_write(phydev, ADIN1300_PHY_CTRL1, reg);
}

+static int adin_config_downspeeds(struct phy_device *phydev)
+{
+ int reg;
+
+ reg = phy_read(phydev, ADIN1300_PHY_CTRL2);
+ if (reg < 0)
+ return reg;
+
+ if ((reg & ADIN1300_DOWNSPEEDS_EN) == ADIN1300_DOWNSPEEDS_EN)
+ return 0;
+
+ reg |= ADIN1300_DOWNSPEEDS_EN;
+
+ return phy_write(phydev, ADIN1300_PHY_CTRL2, reg);
+}
+
static int adin_config_aneg(struct phy_device *phydev)
{
int ret;
@@ -433,6 +456,10 @@ static int adin_config_aneg(struct phy_device *phydev)
if (ret)
return ret;

+ ret = adin_config_downspeeds(phydev);
+ if (ret < 0)
+ return ret;
+
return genphy_config_aneg(phydev);
}

--
2.20.1