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@@ -0,0 +1,43 @@
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+From 2b1b8c4c215af7988136401c902338d091d408a1 Mon Sep 17 00:00:00 2001
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+From: Daniel Golle <[email protected]>
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+Date: Mon, 3 Apr 2023 01:21:57 +0300
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+Subject: [PATCH 2/2] net: phy: realtek: disable SGMII in-band AN for 2.5G PHYs
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+
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+MAC drivers don't use SGMII in-band autonegotiation unless told to do so
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+in device tree using 'managed = "in-band-status"'. When using MDIO to
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+access a PHY, in-band-status is unneeded as we have link-status via
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+MDIO. Switch off SGMII in-band autonegotiation using magic values.
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+
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+Reported-by: Chen Minqiang <[email protected]>
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+Reported-by: Chukun Pan <[email protected]>
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+Reported-by: Yevhen Kolomeiko <[email protected]>
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+Tested-by: Yevhen Kolomeiko <[email protected]>
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+Signed-off-by: Daniel Golle <[email protected]>
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+---
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+ drivers/net/phy/realtek.c | 8 ++++++++
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+ 1 file changed, 8 insertions(+)
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+
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+--- a/drivers/net/phy/realtek.c
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++++ b/drivers/net/phy/realtek.c
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+@@ -875,6 +875,7 @@ static irqreturn_t rtl9000a_handle_inter
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+ static int rtl8221b_config_init(struct phy_device *phydev)
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+ {
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+ u16 option_mode;
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++ int val;
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+
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+ switch (phydev->interface) {
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+ case PHY_INTERFACE_MODE_SGMII:
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+@@ -906,6 +907,13 @@ static int rtl8221b_config_init(struct p
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+ break;
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+ }
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+
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++ /* Disable SGMII AN */
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++ phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7588, 0x2);
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++ phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7589, 0x71d0);
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++ phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7587, 0x3);
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++ phy_read_mmd_poll_timeout(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7587, val,
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++ !(val & BIT(0)), 500, 100000, false);
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++
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+ return 0;
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+ }
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+
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Daniel Golle