[openwrt/openwrt] realtek: mdio: initialize RTL930x mac type control

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/1a1b2d3d365e6fd15991fb5632eef127c85ecd55

commit 1a1b2d3d365e6fd15991fb5632eef127c85ecd55
Author: Markus Stockhausen <markus.stockhausen at gmx.de>
AuthorDate: Sun Feb 15 09:19:27 2026 +0100

    realtek: mdio: initialize RTL930x mac type control
    
    For each port (or port group) the mdio bus needs to define the
    PHY type that is attached to it. There are the following bit
    values that need to be set in SMI_MAC_TYPE_CTRL.
    
    - 0x0: 10G/1G Fiber (SerDes)
    - 0x1: 10G/2G5 GPHY
    - 0x2: FEPHY
    - 0x3: GPHY
    
    SerDes ports are out of scope of the mdio driver and are handled
    by the PCS driver. So the corresponding bits are untouched. That
    is not good as the register default is 0x3 for ports 0-23. To
    make it simple: Without proper setup devices that have SerDes
    driven fiber ports at address 0-23 do not poll in the right way.
    Link detection is broken.
    
    Fix this by initializing the register to zero. This way all ports
    that are not setup by the mdio driver default to "SerDes". That
    should be a reasonable assumption.
    
    Fixes: b271735 ("realtek: mdio: Simplify RTL930x phy polling setup")
    Reported-by: Joe Holden <jwh at zorins.us>
    Suggested-by: Jonas Jelonek <jelonek.jonas at gmail.com>
    Signed-off-by: Markus Stockhausen <markus.stockhausen at gmx.de>
    Link: https://github.com/openwrt/openwrt/pull/22032
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c b/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c
index 628de4790a..d48b46a97b 100644
--- a/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c
+++ b/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c
@@ -704,6 +704,8 @@ static void rtmdio_930x_setup_polling(struct mii_bus *bus)
 	struct rtmdio_phy_info phyinfo;
 	unsigned int mask, val;
 
+	regmap_write(ctrl->map, RTMDIO_930X_SMI_MAC_TYPE_CTRL, 0);
+
 	/* Define PHY specific polling parameters */
 	for (int addr = 0; addr < ctrl->cfg->cpu_port; addr++) {
 		if (ctrl->smi_bus[addr] < 0)