When running in SGMII mode at speeds below 1000Mbps, the auto-negotition
control register must set the MII control width for the MAC interface
to be 8-bits wide. By default the width is 4-bits.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
drivers/net/ethernet/amd/xgbe/xgbe-common.h | 1 +
drivers/net/ethernet/amd/xgbe/xgbe-mdio.c | 2 ++
2 files changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-common.h b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
index 9795419..d07edf9 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-common.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
@@ -1339,6 +1339,7 @@
#define XGBE_AN_CL37_PCS_MODE_BASEX 0x00
#define XGBE_AN_CL37_PCS_MODE_SGMII 0x04
#define XGBE_AN_CL37_TX_CONFIG_MASK 0x08
+#define XGBE_AN_CL37_MII_CTRL_8BIT 0x0100
/* Bit setting and getting macros
* The get macro will extract the current bit field value from within
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
index 8068491..2222bbf8 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
@@ -982,6 +982,8 @@ static void xgbe_an37_init(struct xgbe_prv_data *pdata)
break;
}
+ reg |= XGBE_AN_CL37_MII_CTRL_8BIT;
+
XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL, reg);
netif_dbg(pdata, link, pdata->netdev, "CL37 AN (%s) initialized\n",