target/linux/generic/pending-6.1/725-net-phy-realtek-disable-SGMII-in-band-AN-for-2-5G-PHYs.patch

   1 From 2b1b8c4c215af7988136401c902338d091d408a1 Mon Sep 17 00:00:00 2001
   2 From: Daniel Golle <daniel@makrotopia.org>
   3 Date: Mon, 3 Apr 2023 01:21:57 +0300
   4 Subject: [PATCH 2/2] net: phy: realtek: disable SGMII in-band AN for 2.5G PHYs
   5
   6 MAC drivers don't use SGMII in-band autonegotiation unless told to do so
   7 in device tree using 'managed = "in-band-status"'. When using MDIO to
   8 access a PHY, in-band-status is unneeded as we have link-status via
   9 MDIO. Switch off SGMII in-band autonegotiation using magic values.
  10
  11 Reported-by: Chen Minqiang <ptpt52@gmail.com>
  12 Reported-by: Chukun Pan <amadeus@jmu.edu.cn>
  13 Reported-by: Yevhen Kolomeiko <jarvis2709@gmail.com>
  14 Tested-by: Yevhen Kolomeiko <jarvis2709@gmail.com>
  15 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  16 ---
  17  drivers/net/phy/realtek.c | 8 ++++++++
  18  1 file changed, 8 insertions(+)
  19
  20 --- a/drivers/net/phy/realtek.c
  21 +++ b/drivers/net/phy/realtek.c
  22 @@ -883,6 +883,7 @@ static irqreturn_t rtl9000a_handle_inter
  23  static int rtl8221b_config_init(struct phy_device *phydev)
  24  {
  25         u16 option_mode;
  26 +       int val;
  27
  28         switch (phydev->interface) {
  29         case PHY_INTERFACE_MODE_2500BASEX:
  30 @@ -919,6 +920,13 @@ static int rtl8221b_config_init(struct p
  31                 break;
  32         }
  33
  34 +       /* Disable SGMII AN */
  35 +       phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7588, 0x2);
  36 +       phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7589, 0x71d0);
  37 +       phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7587, 0x3);
  38 +       phy_read_mmd_poll_timeout(phydev, RTL8221B_MMD_SERDES_CTRL, 0x7587,
  39 +                                 val, !(val & BIT(0)), 500, 100000, false);
  40 +
  41         return 0;
  42  }
  43