target/linux/mvebu/patches-4.9/404-net-phy-restart-phy-autonegotiation-after-EEE-advert.patch

   1 From: Russell King <rmk+kernel@armlinux.org.uk>
   2 Date: Thu, 5 Jan 2017 12:21:09 +0000
   3 Subject: [PATCH] net: phy: restart phy autonegotiation after EEE
   4  advertisment change
   5
   6 When the EEE advertisment is changed, we should restart autonegotiation
   7 to update the link partner with the new EEE settings.  Add this trigger
   8 but only if the advertisment has changed.
   9
  10 Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
  11 ---
  12
  13 --- a/drivers/net/phy/phy.c
  14 +++ b/drivers/net/phy/phy.c
  15 @@ -1311,16 +1311,33 @@ EXPORT_SYMBOL(phy_ethtool_get_eee);
  16   */
  17  int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
  18  {
  19 -       int cap, adv;
  20 +       int cap, old_adv, adv, ret;
  21
  22         /* Get Supported EEE */
  23         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
  24         if (cap < 0)
  25                 return cap;
  26
  27 +       old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
  28 +       if (old_adv < 0)
  29 +               return old_adv;
  30 +
  31         adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
  32
  33 -       return phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
  34 +       if (old_adv != adv) {
  35 +               ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
  36 +               if (ret < 0)
  37 +                       return ret;
  38 +
  39 +               /* Restart autonegotiation so the new modes get sent to the
  40 +                * link partner.
  41 +                */
  42 +               ret = phy_restart_aneg(phydev);
  43 +               if (ret < 0)
  44 +                       return ret;
  45 +       }
  46 +
  47 +       return 0;
  48  }
  49  EXPORT_SYMBOL(phy_ethtool_set_eee);
  50