netdev - [PATCH 1/3] net: macb: fix for fixed-link mode

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Date:   Mon, 9 Dec 2019 11:14:21 +0000
From:   Milind Parab <mparab@...ence.com>
To:     <nicolas.nerre@...rochip.com>, <andrew@...n.ch>,
        <antoine.tenart@...tlin.com>, <f.fainelli@...il.com>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <hkallweit1@...il.com>, <linux-kernel@...r.kernel.org>,
        <dkangude@...ence.com>, <a.fatoum@...gutronix.de>,
        <brad.mouring@...com>, <rmk+kernel@...linux.org.uk>,
        <pthombar@...ence.com>, Milind Parab <mparab@...ence.com>
Subject: [PATCH 1/3] net: macb: fix for fixed-link mode

This patch fix the issue with fixed link. With fixed-link
device opening fails due to macb_phylink_connect not
handling fixed-link mode, in which case no MAC-PHY connection
is needed and phylink_connect return success (0), however
in current driver attempt is made to search and connect to
PHY even for fixed-link.

Signed-off-by: Milind Parab <mparab@...ence.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 9c767ee252ac..6b68ef34ab19 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -615,17 +615,13 @@ static int macb_phylink_connect(struct macb *bp)
 {
 	struct net_device *dev = bp->dev;
 	struct phy_device *phydev;
+	struct device_node *dn = bp->pdev->dev.of_node;
 	int ret;
 
-	if (bp->pdev->dev.of_node &&
-	    of_parse_phandle(bp->pdev->dev.of_node, "phy-handle", 0)) {
-		ret = phylink_of_phy_connect(bp->phylink, bp->pdev->dev.of_node,
-					     0);
-		if (ret) {
-			netdev_err(dev, "Could not attach PHY (%d)\n", ret);
-			return ret;
-		}
-	} else {
+	if (dn)
+		ret = phylink_of_phy_connect(bp->phylink, dn, 0);
+
+	if (!dn || (ret && !of_parse_phandle(dn, "phy-handle", 0))) {
 		phydev = phy_find_first(bp->mii_bus);
 		if (!phydev) {
 			netdev_err(dev, "no PHY found\n");
@@ -638,6 +634,9 @@ static int macb_phylink_connect(struct macb *bp)
 			netdev_err(dev, "Could not attach to PHY (%d)\n", ret);
 			return ret;
 		}
+	} else if (ret) {
+		netdev_err(dev, "Could not attach PHY (%d)\n", ret);
+		return ret;
 	}
 
 	phylink_start(bp->phylink);
-- 
2.17.1