[PATCH v2 03/25] net/axgbe: fix fluctuations for 1G BELFUSE SFP

[Venkat Kumar Ande]

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.

Without the fix user will see continuous port link up and down.

Fixes: a5c7273771e8 ("net/axgbe: add phy programming APIs")
Cc: stable at dpdk.org

Signed-off-by: Venkat Kumar Ande <venkatkumar.ande at amd.com>
---
 drivers/net/axgbe/axgbe_phy_impl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/axgbe/axgbe_phy_impl.c b/drivers/net/axgbe/axgbe_phy_impl.c
index 54fe9faae0..ee9dcbe3da 100644
--- a/drivers/net/axgbe/axgbe_phy_impl.c
+++ b/drivers/net/axgbe/axgbe_phy_impl.c
@@ -578,6 +578,9 @@ static bool axgbe_phy_belfuse_parse_quirks(struct axgbe_port *pdata)
 		   AXGBE_BEL_FUSE_VENDOR, strlen(AXGBE_BEL_FUSE_VENDOR)))
 		return false;
 
+	/* Reset PHY - wait for self-clearing reset bit to clear */
+	pdata->phy_if.phy_impl.reset(pdata);
+
 	if (!memcmp(&sfp_eeprom->base[AXGBE_SFP_BASE_VENDOR_PN],
 		    AXGBE_BEL_FUSE_PARTNO, strlen(AXGBE_BEL_FUSE_PARTNO))) {
 		phy_data->sfp_base = AXGBE_SFP_BASE_1000_SX;
-- 
2.34.1