netdev - [PATCH] net: phylink: disable BMCR_ISOLATE in phylink_mii_c22_pcs

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Date:   Tue, 20 Oct 2020 13:12:49 -0600
From:   Robert Hancock <robert.hancock@...ian.com>
To:     linux@...linux.org.uk, andrew@...n.ch, hkallweit1@...il.com
Cc:     netdev@...r.kernel.org, Robert Hancock <robert.hancock@...ian.com>
Subject: [PATCH] net: phylink: disable BMCR_ISOLATE in phylink_mii_c22_pcs_config

The Xilinx PCS/PMA PHY requires that BMCR_ISOLATE be disabled for proper
operation in 1000BaseX mode. It should be safe to ensure this bit is
disabled in phylink_mii_c22_pcs_config in all cases.

Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
---
 drivers/net/phy/phylink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index fe2296fdda19..5d8c015bc9f2 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -2515,9 +2515,10 @@ int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
 
 	changed = ret > 0;
 
+	/* Ensure ISOLATE bit is disabled */
 	bmcr = mode == MLO_AN_INBAND ? BMCR_ANENABLE : 0;
 	ret = mdiobus_modify(pcs->bus, pcs->addr, MII_BMCR,
-			     BMCR_ANENABLE, bmcr);
+			     BMCR_ANENABLE | BMCR_ISOLATE, bmcr);
 	if (ret < 0)
 		return ret;
 
-- 
2.18.4