FAILED: patch "[PATCH] net: phy: dp83869: fix status reporting for 1000base-x" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 378e8feea9a70d37a5dc1678b7ec27df21099fa5
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024120630-barbed-mutual-faca@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 378e8feea9a70d37a5dc1678b7ec27df21099fa5 Mon Sep 17 00:00:00 2001
From: Romain Gantois <[email protected]>
Date: Tue, 12 Nov 2024 15:06:08 +0100
Subject: [PATCH] net: phy: dp83869: fix status reporting for 1000base-x
autonegotiation

The DP83869 PHY transceiver supports converting from RGMII to 1000base-x. In this operation mode, autonegotiation can be performed, as described in IEEE802.3.

The DP83869 has a set of fiber-specific registers located at offset 0xc00. When the transceiver is configured in RGMII-to-1000base-x mode, these registers are mapped onto offset 0, which should make reading the autonegotiation status transparent.

However, the fiber registers at offset 0xc04 and 0xc05 follow the bit layout specified in Clause 37, and genphy_read_status() assumes a Clause 22 layout. Thus, genphy_read_status() doesn't properly read the capabilities advertised by the link partner, resulting in incorrect link parameters.

Similarly, genphy_config_aneg() doesn't properly write advertised capabilities.

Fix the 1000base-x autonegotiation procedure by replacing genphy_read_status() and genphy_config_aneg() with their Clause 37 equivalents.

index 5f056d7db83e..b6b38caf9c0e 100644
@@ -153,19 +153,32 @@ struct dp83869_private {
 	int mode;
 };
 
+static int dp83869_config_aneg(struct phy_device *phydev)
+{
+	struct dp83869_private *dp83869 = phydev->priv;
+
+	if (dp83869->mode != DP83869_RGMII_1000_BASE)
+		return genphy_config_aneg(phydev);
+
+	return genphy_c37_config_aneg(phydev);
+}
+
 static int dp83869_read_status(struct phy_device *phydev)
 {
 	struct dp83869_private *dp83869 = phydev->priv;
+	bool changed;
 	int ret;
 
+	if (dp83869->mode == DP83869_RGMII_1000_BASE)
+		return genphy_c37_read_status(phydev, &changed);
+
 	ret = genphy_read_status(phydev);
 	if (ret)
 		return ret;
 
-	if (linkmode_test_bit(ETHTOOL_LINK_MODE_FIBRE_BIT, phydev->supported)) {
+	if (dp83869->mode == DP83869_RGMII_100_BASE) {
 		if (phydev->link) {
-			if (dp83869->mode == DP83869_RGMII_100_BASE)
-				phydev->speed = SPEED_100;
+			phydev->speed = SPEED_100;
 		} else {
 			phydev->speed = SPEED_UNKNOWN;
 			phydev->duplex = DUPLEX_UNKNOWN;

@@ -898,6 +911,7 @@ static int dp83869_phy_reset(struct phy_device *phydev)
 	.soft_reset	= dp83869_phy_reset,			\
 	.config_intr	= dp83869_config_intr,			\
 	.handle_interrupt = dp83869_handle_interrupt,		\
+	.config_aneg    = dp83869_config_aneg,                  \
 	.read_status	= dp83869_read_status,			\
 	.get_tunable	= dp83869_get_tunable,			\
 	.set_tunable	= dp83869_set_tunable,			\