target/linux/generic/pending-6.1/722-net-phy-realtek-support-switching-between-SGMII-and-.patch

   1 From 312753d0aadba0f58841ae513b80fdbabc887523 Mon Sep 17 00:00:00 2001
   2 From: Chukun Pan <amadeus@jmu.edu.cn>
   3 Date: Wed, 8 Feb 2023 16:32:18 +0800
   4 Subject: [PATCH] net: phy: realtek: support switching between SGMII and
   5  2500BASE-X for RTL822x series
   6
   7 After commit ace6aba ("net: phy: realtek: rtl8221: allow to configure
   8 SERDES mode"), the rtl8221 phy can work in SGMII and 2500base-x modes
   9 respectively. So add interface automatic switching for rtl8221 phy to
  10 match various wire speeds.
  11
  12 Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
  13 ---
  14  drivers/net/phy/realtek.c | 26 ++++++++++++++++++++++++--
  15  1 file changed, 24 insertions(+), 2 deletions(-)
  16
  17 --- a/drivers/net/phy/realtek.c
  18 +++ b/drivers/net/phy/realtek.c
  19 @@ -686,6 +686,25 @@ static int rtl822x_config_aneg(struct ph
  20         return __genphy_config_aneg(phydev, ret);
  21  }
  22
  23 +static void rtl822x_update_interface(struct phy_device *phydev)
  24 +{
  25 +       /* Automatically switch SERDES interface between
  26 +        * SGMII and 2500-BaseX according to speed.
  27 +        */
  28 +       switch (phydev->speed) {
  29 +       case SPEED_2500:
  30 +               phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
  31 +               break;
  32 +       case SPEED_1000:
  33 +       case SPEED_100:
  34 +       case SPEED_10:
  35 +               phydev->interface = PHY_INTERFACE_MODE_SGMII;
  36 +               break;
  37 +       default:
  38 +               break;
  39 +       }
  40 +}
  41 +
  42  static int rtl822x_read_status(struct phy_device *phydev)
  43  {
  44         int ret;
  45 @@ -704,11 +723,14 @@ static int rtl822x_read_status(struct ph
  46                         phydev->lp_advertising, lpadv & RTL_LPADV_2500FULL);
  47         }
  48
  49 -       ret = genphy_read_status(phydev);
  50 +       ret = rtlgen_read_status(phydev);
  51         if (ret < 0)
  52                 return ret;
  53
  54 -       return rtlgen_get_speed(phydev);
  55 +       if (phydev->is_c45 && phydev->link)
  56 +               rtl822x_update_interface(phydev);
  57 +
  58 +       return 0;
  59  }
  60
  61  static bool rtlgen_supports_2_5gbps(struct phy_device *phydev)