target/linux/mvebu/patches-4.9/450-reprobe_sfp_phy.patch

   1 From 28baa5e2635285b178326b301f534ed95c65dd01 Mon Sep 17 00:00:00 2001
   2 From: Jonas Gorski <jonas.gorski@gmail.com>
   3 Date: Thu, 29 Sep 2016 11:44:39 +0200
   4 Subject: [PATCH] sfp: retry phy probe if unsuccessful
   5
   6 Some phys seem to take longer than 50 ms to come out of reset, so retry
   7 until we find a phy.
   8
   9 Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
  10 ---
  11  drivers/net/phy/sfp.c | 38 +++++++++++++++++++++++++-------------
  12  1 file changed, 25 insertions(+), 13 deletions(-)
  13
  14 --- a/drivers/net/phy/sfp.c
  15 +++ b/drivers/net/phy/sfp.c
  16 @@ -491,7 +491,7 @@ static void sfp_sm_phy_detach(struct sfp
  17         sfp->mod_phy = NULL;
  18  }
  19
  20 -static void sfp_sm_probe_phy(struct sfp *sfp)
  21 +static int sfp_sm_probe_phy(struct sfp *sfp)
  22  {
  23         struct phy_device *phy;
  24         int err;
  25 @@ -500,12 +500,12 @@ static void sfp_sm_probe_phy(struct sfp
  26
  27         phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
  28         if (IS_ERR(phy)) {
  29 +               if (PTR_ERR(phy) == -ENODEV) {
  30 +                       dev_dbg(sfp->dev, "no PHY detected\n");
  31 +                       return -EAGAIN;
  32 +               }
  33                 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
  34 -               return;
  35 -       }
  36 -       if (!phy) {
  37 -               dev_info(sfp->dev, "no PHY detected\n");
  38 -               return;
  39 +               return PTR_ERR(phy);
  40         }
  41
  42         if (sfp->phylink) {
  43 @@ -515,12 +515,14 @@ static void sfp_sm_probe_phy(struct sfp
  44                         phy_device_free(phy);
  45                         dev_err(sfp->dev, "phylink_connect_phy failed: %d\n",
  46                                 err);
  47 -                       return;
  48 +                       return err;
  49                 }
  50         }
  51
  52         sfp->mod_phy = phy;
  53         phy_start(phy);
  54 +
  55 +       return 0;
  56  }
  57
  58  static void sfp_sm_link_up(struct sfp *sfp)
  59 @@ -569,30 +571,41 @@ static void sfp_sm_fault(struct sfp *sfp
  60
  61  static void sfp_sm_mod_init(struct sfp *sfp)
  62  {
  63 +       int ret = 0;
  64 +
  65         sfp_module_tx_enable(sfp);
  66
  67 -       /* Wait t_init before indicating that the link is up, provided the
  68 -        * current state indicates no TX_FAULT.  If TX_FAULT clears before
  69 -        * this time, that's fine too.
  70 -        */
  71 -       sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
  72 -       sfp->sm_retries = 5;
  73 +       if (!sfp->phylink)
  74 +               return;
  75
  76 -       if (sfp->phylink) {
  77 -               /* Setting the serdes link mode is guesswork: there's no
  78 -                * field in the EEPROM which indicates what mode should
  79 -                * be used.
  80 -                *
  81 -                * If it's a gigabit-only fiber module, it probably does
  82 -                * not have a PHY, so switch to 802.3z negotiation mode.
  83 -                * Otherwise, switch to SGMII mode (which is required to
  84 -                * support non-gigabit speeds) and probe for a PHY.
  85 +       /* Setting the serdes link mode is guesswork: there's no
  86 +        * field in the EEPROM which indicates what mode should
  87 +        * be used.
  88 +        *
  89 +        * If it's a gigabit-only fiber module, it probably does
  90 +        * not have a PHY, so switch to 802.3z negotiation mode.
  91 +        * Otherwise, switch to SGMII mode (which is required to
  92 +        * support non-gigabit speeds) and probe for a PHY.
  93 +        */
  94 +       if (sfp->id.base.e1000_base_t ||
  95 +           sfp->id.base.e100_base_lx ||
  96 +           sfp->id.base.e100_base_fx)
  97 +               ret = sfp_sm_probe_phy(sfp);
  98 +
  99 +       if (!ret) {
 100 +               /* Wait t_init before indicating that the link is up, provided
 101 +                * the current state indicates no TX_FAULT.  If TX_FAULT clears
 102 +                * this time, that's fine too.
 103                  */
 104 -               if (sfp->id.base.e1000_base_t ||
 105 -                   sfp->id.base.e100_base_lx ||
 106 -                   sfp->id.base.e100_base_fx)
 107 -                       sfp_sm_probe_phy(sfp);
 108 +               sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
 109 +               sfp->sm_retries = 5;
 110 +               return;
 111         }
 112 +
 113 +       if (ret == -EAGAIN)
 114 +               sfp_sm_set_timer(sfp, T_PROBE_RETRY);
 115 +       else
 116 +               sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
 117  }
 118
 119  static int sfp_sm_mod_probe(struct sfp *sfp)