target/linux/generic/pending-4.14/735-net-phy-at803x-fix-at8033-sgmii-mode.patch

   1 From: Roman Yeryomin <roman@advem.lv>
   2 Subject: kernel: add at803x fix for sgmii mode
   3
   4 Some (possibly broken) bootloaders incorreclty initialize at8033
   5 phy. This patch enables sgmii autonegotiation mode.
   6
   7 [john@phrozen.org: felix added this to his upstream queue]
   8
   9 Signed-off-by: Roman Yeryomin <roman@advem.lv>
  10 ---
  11  drivers/net/phy/at803x.c | 25 +++++++++++++++++++++++++
  12  1 file changed, 25 insertions(+)
  13
  14 --- a/drivers/net/phy/at803x.c
  15 +++ b/drivers/net/phy/at803x.c
  16 @@ -55,6 +55,10 @@
  17  #define AT803X_DEBUG_ADDR                      0x1D
  18  #define AT803X_DEBUG_DATA                      0x1E
  19
  20 +#define AT803X_REG_CHIP_CONFIG                 0x1f
  21 +#define AT803X_BT_BX_REG_SEL                   0x8000
  22 +#define AT803X_SGMII_ANEG_EN                   0x1000
  23 +
  24  #define AT803X_MODE_CFG_MASK                   0x0F
  25  #define AT803X_MODE_CFG_SGMII                  0x01
  26
  27 @@ -293,6 +297,27 @@ static int at803x_config_init(struct phy
  28  {
  29         struct at803x_platform_data *pdata;
  30         int ret;
  31 +       u32 v;
  32 +
  33 +       if (phydev->drv->phy_id == ATH8031_PHY_ID &&
  34 +               phydev->interface == PHY_INTERFACE_MODE_SGMII)
  35 +       {
  36 +               v = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
  37 +               /* select SGMII/fiber page */
  38 +               ret = phy_write(phydev, AT803X_REG_CHIP_CONFIG,
  39 +                                               v & ~AT803X_BT_BX_REG_SEL);
  40 +               if (ret)
  41 +                       return ret;
  42 +               /* enable SGMII autonegotiation */
  43 +               ret = phy_write(phydev, MII_BMCR, AT803X_SGMII_ANEG_EN);
  44 +               if (ret)
  45 +                       return ret;
  46 +               /* select copper page */
  47 +               ret = phy_write(phydev, AT803X_REG_CHIP_CONFIG,
  48 +                                               v | AT803X_BT_BX_REG_SEL);
  49 +               if (ret)
  50 +                       return ret;
  51 +       }
  52
  53         ret = genphy_config_init(phydev);
  54         if (ret < 0)