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.
This change enables downshift and configures the number of retries to
default 8 (maximum supported value).
The change has been adapted from the Marvell PHY driver.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---
drivers/net/phy/adin.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index bc4393195de7..d6d1f5037eb7 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -29,6 +29,18 @@
#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_PHY_CTRL3 0x0017
+#define ADIN1300_LINKING_EN BIT(13)
+#define ADIN1300_DOWNSPEED_RETRIES_MSK GENMASK(12, 10)
+#define ADIN1300_DOWNSPEED_RETRIES_OFF 10
+
#define ADIN1300_INT_MASK_REG 0x0018
#define ADIN1300_INT_MDIO_SYNC_EN BIT(9)
#define ADIN1300_INT_ANEG_STAT_CHNG_EN BIT(8)
@@ -259,6 +271,29 @@ static int adin_config_rmii_mode(struct phy_device *phydev)
ADIN1300_GE_RMII_CFG_REG, reg);
}
+static int adin_config_down_shift(struct phy_device *phydev, bool enable,
+ u8 retries)
+{
+ u16 mask, set;
+ int rc;
+
+ if (!enable)
+ return phy_clear_bits(phydev, ADIN1300_PHY_CTRL2,
+ ADIN1300_DOWNSPEEDS_EN);
+
+ mask = ADIN1300_LINKING_EN | ADIN1300_DOWNSPEED_RETRIES_MSK;
+ set = (retries << ADIN1300_DOWNSPEED_RETRIES_OFF);
+ set &= ADIN1300_DOWNSPEED_RETRIES_MSK;
+ set |= ADIN1300_LINKING_EN;
+
+ rc = phy_modify_changed(phydev, ADIN1300_PHY_CTRL3, mask, set);
+ if (rc < 0)
+ return rc;
+
+ return phy_set_bits(phydev, ADIN1300_PHY_CTRL2,
+ ADIN1300_DOWNSPEEDS_EN);
+}
+
static int adin_config_init_edpd(struct phy_device *phydev)
{
struct adin_priv *priv = phydev->priv;
@@ -289,6 +324,10 @@ static int adin_config_init(struct phy_device *phydev)
if (rc < 0)
return rc;
+ rc = adin_config_down_shift(phydev, true, 8);
+ if (rc < 0)
+ return rc;
+
rc = adin_config_init_edpd(phydev);
if (rc < 0)
return rc;
--
2.20.1
