netdev - [PATCH] net: phy: marvell10g: allow PHY to probe without firmware

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Message-Id: <E1hYTO0-0000MZ-2d@rmk-PC.armlinux.org.uk>
Date:   Wed, 05 Jun 2019 11:43:16 +0100
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org
Subject: [PATCH] net: phy: marvell10g: allow PHY to probe without firmware

Allow the PHY to probe when there is no firmware, but do not allow the
link to come up by forcing the PHY state to PHY_HALTED in a similar way
to phy_error().

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
Depends on "net: phy: marvell10g: report if the PHY fails to boot firmware"

 drivers/net/phy/marvell10g.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 754cde873dde..86333d98b384 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -60,6 +60,8 @@ enum {
 };
 
 struct mv3310_priv {
+	bool firmware_failed;
+
 	struct device *hwmon_dev;
 	char *hwmon_name;
 };
@@ -214,6 +216,10 @@ static int mv3310_probe(struct phy_device *phydev)
 	    (phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
 		return -ENODEV;
 
+	priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
 	ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_BOOT);
 	if (ret < 0)
 		return ret;
@@ -221,13 +227,9 @@ static int mv3310_probe(struct phy_device *phydev)
 	if (ret & MV_PMA_BOOT_FATAL) {
 		dev_warn(&phydev->mdio.dev,
 			 "PHY failed to boot firmware, status=%04x\n", ret);
-		return -ENODEV;
+		priv->firmware_failed = true;
 	}
 
-	priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
 	dev_set_drvdata(&phydev->mdio.dev, priv);
 
 	ret = mv3310_hwmon_probe(phydev);
@@ -247,6 +249,19 @@ static int mv3310_resume(struct phy_device *phydev)
 	return mv3310_hwmon_config(phydev, true);
 }
 
+static void mv3310_link_change_notify(struct phy_device *phydev)
+{
+	struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
+	enum phy_state state = phydev->state;
+
+	if (priv->firmware_failed &&
+	    (state == PHY_UP || state == PHY_RESUMING)) {
+		dev_warn(&phydev->mdio.dev,
+			 "PHY firmware failure: link forced down");
+		phydev->state = PHY_HALTED;
+	}
+}
+
 /* Some PHYs in the Alaska family such as the 88X3310 and the 88E2010
  * don't set bit 14 in PMA Extended Abilities (1.11), although they do
  * support 2.5GBASET and 5GBASET. For these models, we can still read their
-- 
2.7.4