Frequent link up/down events can happen when a Bel Fuse SFP part is
connected to the amd-xgbe device. Try to avoid the frequent link
issues by resetting the PHY as documented in Bel Fuse SFP datasheets.
Signed-off-by: Sudheesh Mavila <sudheesh.mav...@amd.com>
Signed-off-by: Shyam Sundar S K <shyam-sundar....@amd.com>
---
drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
index 1bb468ac9635..e328fd9bd294 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
@@ -922,6 +922,12 @@ static bool xgbe_phy_belfuse_phy_quirks(struct
xgbe_prv_data *pdata)
if ((phy_id & 0xfffffff0) != 0x03625d10)
return false;
+ /* Reset PHY - wait for self-clearing reset bit to clear */
+ reg = phy_read(phy_data->phydev, 0x00);
+ phy_write(phy_data->phydev, 0x00, reg | 0x8000);
+ read_poll_timeout(phy_read, reg, !(reg & 0x8000) || reg < 0,
+ 10000, 50000, true, phy_data->phydev, 0x0);
+
/* Disable RGMII mode */
phy_write(phy_data->phydev, 0x18, 0x7007);
reg = phy_read(phy_data->phydev, 0x18);
--
2.25.1
