[openwrt/openwrt] generic: fix probe issues with RealTek RTL8221B PHYs

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch openwrt-24.10:
https://git.openwrt.org/d30773abe8cc333137a964ffedf878cc425ac9ed

commit d30773abe8cc333137a964ffedf878cc425ac9ed
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Thu Jan 23 03:36:10 2025 +0000

    generic: fix probe issues with RealTek RTL8221B PHYs
    
    Import patch "net: phy: realtek: mark existing MMDs as present"
    
        When using Clause-45 mode to access RealTek RTL8221B 2.5G PHYs some
        versions of the PHY fail to report the MMDs present on the PHY.
        Mark MMDs PMAPMD, PCS and AN which are always existing according to
        the datasheet as present to fix that.
    
    Fixes: #16823, #17183, #17232
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
    Tested-by: Aleksander Jan Bajkowski <olek2 at wp.pl>
    Tested-by: Juan Pedro Paredes Caballero <juanpedro.paredes at gmail.com>
    (cherry picked from commit 730db6b893748517949b1d3a0c0cb8b6c1288040)
---
 ...phy-realtek-mark-existing-MMDs-as-present.patch | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/target/linux/generic/pending-6.6/720-07-net-phy-realtek-mark-existing-MMDs-as-present.patch b/target/linux/generic/pending-6.6/720-07-net-phy-realtek-mark-existing-MMDs-as-present.patch
new file mode 100644
index 0000000000..1ef42e866d
--- /dev/null
+++ b/target/linux/generic/pending-6.6/720-07-net-phy-realtek-mark-existing-MMDs-as-present.patch
@@ -0,0 +1,27 @@
+From 1addfb042a9d27788a0fb2c2935045b56fd8560e Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel at makrotopia.org>
+Date: Thu, 23 Jan 2025 03:25:29 +0000
+Subject: [PATCH] net: phy: realtek: mark existing MMDs as present
+
+When using Clause-45 mode to access RealTek RTL8221B 2.5G PHYs some
+versions of the PHY fail to report the MMDs present on the PHY.
+Mark MMDs PMAPMD, PCS and AN which are always existing according to
+the datasheet as present to fix that.
+
+Signed-off-by: Daniel Golle <daniel at makrotopia.org>
+---
+ drivers/net/phy/realtek/realtek_main.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/drivers/net/phy/realtek/realtek_main.c
++++ b/drivers/net/phy/realtek/realtek_main.c
+@@ -1034,6 +1034,9 @@ static int rtl822x_c45_get_features(stru
+ 	linkmode_set_bit(ETHTOOL_LINK_MODE_TP_BIT,
+ 			 phydev->supported);
+ 
++	phydev->c45_ids.mmds_present |= MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS |
++				        MDIO_DEVS_AN;
++
+ 	return genphy_c45_pma_read_abilities(phydev);
+ }
+