linux-kernel - [PATCH net-next v3 05/11] net: phy: print an info if a broken C45 bus is found

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Message-Id: <20230620-feature-c45-over-c22-v3-5-9eb37edf7be0@kernel.org>
Date:   Wed, 12 Jul 2023 17:07:05 +0200
From:   Michael Walle <mwalle@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Marek Behún <kabel@...nel.org>,
        Xu Liang <lxu@...linear.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Simon Horman <simon.horman@...igine.com>,
        Michael Walle <mwalle@...nel.org>
Subject: [PATCH net-next v3 05/11] net: phy: print an info if a broken C45
 bus is found

If there is an PHY which gets confused by C45 transactions on the MDIO
bus, print an info together with the PHY identifier of the offending
one.

Signed-off-by: Michael Walle <mwalle@...nel.org>
---
v3:
 - make it a dev_dbg()
 - check is phydev is not null
---
 drivers/net/phy/mdio_bus.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 29ad9302fe11..bdc178671234 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -617,10 +617,10 @@ static int mdiobus_scan_bus_c45(struct mii_bus *bus)
  */
 void mdiobus_scan_for_broken_c45_access(struct mii_bus *bus)
 {
+	struct phy_device *phydev;
 	int i;
 
 	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		struct phy_device *phydev;
 		u32 oui;
 
 		phydev = mdiobus_get_phy(bus, i);
@@ -633,6 +633,11 @@ void mdiobus_scan_for_broken_c45_access(struct mii_bus *bus)
 			break;
 		}
 	}
+
+	if (phydev && bus->prevent_c45_access)
+		dev_dbg(&bus->dev,
+			"Detected broken PHY (ID %08lx). Disabling C45 bus transactions.\n",
+			(unsigned long)phydev->phy_id);
 }
 EXPORT_SYMBOL_GPL(mdiobus_scan_for_broken_c45_access);
 

-- 
2.39.2