netdev - [PATCH net 1/2] net: dsa: sja1105: fix SGMII PCS being forced to SPEED_UNKNOWN instead of SPEED

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Date:   Thu,  4 Mar 2021 12:56:53 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net 1/2] net: dsa: sja1105: fix SGMII PCS being forced to SPEED_UNKNOWN instead of SPEED_10

From: Vladimir Oltean <vladimir.oltean@....com>

When using MLO_AN_PHY or MLO_AN_FIXED, the MII_BMCR of the SGMII PCS is
read before resetting the switch so it can be reprogrammed afterwards.
This works for the speeds of 1Gbps and 100Mbps, but not for 10Mbps,
because SPEED_10 is actually 0, so AND-ing anything with 0 is false,
therefore that last branch is dead code.

Do what others do (genphy_read_status_fixed, phy_mii_ioctl) and just
remove the check for SPEED_10, let it fall into the default case.

Fixes: ffe10e679cec ("net: dsa: sja1105: Add support for the SGMII port")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 7692338730df..c1982615c631 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -1922,7 +1922,7 @@ int sja1105_static_config_reload(struct sja1105_private *priv,
 				speed = SPEED_1000;
 			else if (bmcr & BMCR_SPEED100)
 				speed = SPEED_100;
-			else if (bmcr & BMCR_SPEED10)
+			else
 				speed = SPEED_10;
 
 			sja1105_sgmii_pcs_force_speed(priv, speed);
-- 
2.25.1