netdev - [PATCH net-next 1/1] net: phy: Add additional logics on probing C45 PHY devices

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Message-Id: <20201112150351.12662-1-vee.khee.wong@intel.com>
Date:   Thu, 12 Nov 2020 23:03:51 +0800
From:   Wong Vee Khee <vee.khee.wong@...el.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Voon Wei Feng <weifeng.voon@...el.com>,
        Wong Vee Khee <vee.khee.wong@...el.com>
Subject: [PATCH net-next 1/1] net: phy: Add additional logics on probing C45 PHY devices

For clause 45 PHY, introduce additional logics in get_phy_c45_ids() to
check if there is at least one valid device ID, return 0 on true, and
-ENODEV otherwise.

Signed-off-by: Wong Vee Khee <vee.khee.wong@...el.com>
---
 drivers/net/phy/phy_device.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index e13a46c25437..c9ddcd7a63d4 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -730,6 +730,7 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr,
 	const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
 	u32 devs_in_pkg = 0;
 	int i, ret, phy_reg;
+	u32 valid_did = 0;
 
 	/* Find first non-zero Devices In package. Device zero is reserved
 	 * for 802.3 c45 complied PHYs, so don't probe it at first.
@@ -796,12 +797,21 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr,
 		if (phy_reg < 0)
 			return -EIO;
 		c45_ids->device_ids[i] |= phy_reg;
+
+		/* Check if there is at least one valid device ID */
+		if (c45_ids->device_ids[i] &&
+		    (c45_ids->device_ids[i] & 0x1fffffff) != 0x1fffffff)
+			valid_did |= (1 << i);
 	}
 
 	c45_ids->devices_in_package = devs_in_pkg;
 	/* Bit 0 doesn't represent a device, it indicates c22 regs presence */
 	c45_ids->mmds_present = devs_in_pkg & ~BIT(0);
 
+	/* There is no valid device ID */
+	if (!valid_did)
+		return -ENODEV;
+
 	return 0;
 }
 
-- 
2.17.0