target/linux/layerscape/patches-5.4/701-net-0280-net-mscc-ocelot-do-not-force-Felix-MACs-at-lower-spe.patch

   1 From 4ba6e00c2f45bf4189ec6a8ef71b45346ae804f2 Mon Sep 17 00:00:00 2001
   2 From: Vladimir Oltean <vladimir.oltean@nxp.com>
   3 Date: Thu, 28 Nov 2019 15:36:10 +0200
   4 Subject: [PATCH] net: mscc: ocelot: do not force Felix MACs at lower speeds
   5  than gigabit
   6
   7 In the LS1028A, the VSC9959 switch was integrated with an NXP PCS which
   8 performs SGMII AN and rate adaptation autonomously. The MAC does not
   9 need to know about this, and forcing the MAC speed to something else,
  10 when connected to a 10/100 link partner, actually breaks the GMII
  11 internal link between the MAC and the PCS.
  12
  13 Add a quirk system in the ocelot driver, and a first quirk called "PCS
  14 performs rate adaptation", to distinguish the VSC7514 from the VSC9959
  15 regarding this behavior.
  16
  17 Signed-off-by: Catalin Horghidan <catalin.horghidan@nxp.com>
  18 Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
  19 ---
  20  drivers/net/dsa/ocelot/felix.c         |  1 +
  21  drivers/net/dsa/ocelot/felix.h         |  1 +
  22  drivers/net/dsa/ocelot/felix_vsc9959.c |  1 +
  23  drivers/net/ethernet/mscc/ocelot.c     | 32 ++++++++++++++++++--------------
  24  include/soc/mscc/ocelot.h              |  7 +++++++
  25  5 files changed, 28 insertions(+), 14 deletions(-)
  26
  27 --- a/drivers/net/dsa/ocelot/felix.c
  28 +++ b/drivers/net/dsa/ocelot/felix.c
  29 @@ -249,6 +249,7 @@ static int felix_init_structs(struct fel
  30         ocelot->num_stats       = felix->info->num_stats;
  31         ocelot->shared_queue_sz = felix->info->shared_queue_sz;
  32         ocelot->ops             = felix->info->ops;
  33 +       ocelot->quirks          = felix->info->quirks;
  34
  35         base = pci_resource_start(felix->pdev, felix->info->pci_bar);
  36
  37 --- a/drivers/net/dsa/ocelot/felix.h
  38 +++ b/drivers/net/dsa/ocelot/felix.h
  39 @@ -18,6 +18,7 @@ struct felix_info {
  40         unsigned int                    num_stats;
  41         int                             num_ports;
  42         int                             pci_bar;
  43 +       unsigned long                   quirks;
  44  };
  45
  46  extern struct felix_info               felix_info_vsc9959;
  47 --- a/drivers/net/dsa/ocelot/felix_vsc9959.c
  48 +++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
  49 @@ -584,4 +584,5 @@ struct felix_info felix_info_vsc9959 = {
  50         .shared_queue_sz        = 128 * 1024,
  51         .num_ports              = 6,
  52         .pci_bar                = 4,
  53 +       .quirks                 = OCELOT_PCS_PERFORMS_RATE_ADAPTATION,
  54  };
  55 --- a/drivers/net/ethernet/mscc/ocelot.c
  56 +++ b/drivers/net/ethernet/mscc/ocelot.c
  57 @@ -409,27 +409,32 @@ static u16 ocelot_wm_enc(u16 value)
  58  void ocelot_adjust_link(struct ocelot *ocelot, int port,
  59                         struct phy_device *phydev)
  60  {
  61 +       int speed, mac_speed, mac_mode = DEV_MAC_MODE_CFG_FDX_ENA;
  62         struct ocelot_port *ocelot_port = ocelot->ports[port];
  63 -       int speed, mode = 0;
  64
  65 -       switch (phydev->speed) {
  66 +       if (ocelot->quirks & OCELOT_PCS_PERFORMS_RATE_ADAPTATION)
  67 +               speed = SPEED_1000;
  68 +       else
  69 +               speed = phydev->speed;
  70 +
  71 +       switch (speed) {
  72         case SPEED_10:
  73 -               speed = OCELOT_SPEED_10;
  74 +               mac_speed = OCELOT_SPEED_10;
  75                 break;
  76         case SPEED_100:
  77 -               speed = OCELOT_SPEED_100;
  78 +               mac_speed = OCELOT_SPEED_100;
  79                 break;
  80         case SPEED_1000:
  81 -               speed = OCELOT_SPEED_1000;
  82 -               mode = DEV_MAC_MODE_CFG_GIGA_MODE_ENA;
  83 +               mac_speed = OCELOT_SPEED_1000;
  84 +               mac_mode |= DEV_MAC_MODE_CFG_GIGA_MODE_ENA;
  85                 break;
  86         case SPEED_2500:
  87 -               speed = OCELOT_SPEED_2500;
  88 -               mode = DEV_MAC_MODE_CFG_GIGA_MODE_ENA;
  89 +               mac_speed = OCELOT_SPEED_2500;
  90 +               mac_mode |= DEV_MAC_MODE_CFG_GIGA_MODE_ENA;
  91                 break;
  92         default:
  93                 dev_err(ocelot->dev, "Unsupported PHY speed on port %d: %d\n",
  94 -                       port, phydev->speed);
  95 +                       port, speed);
  96                 return;
  97         }
  98
  99 @@ -439,8 +444,7 @@ void ocelot_adjust_link(struct ocelot *o
 100                 return;
 101
 102         /* Only full duplex supported for now */
 103 -       ocelot_port_writel(ocelot_port, DEV_MAC_MODE_CFG_FDX_ENA |
 104 -                          mode, DEV_MAC_MODE_CFG);
 105 +       ocelot_port_writel(ocelot_port, mac_mode, DEV_MAC_MODE_CFG);
 106
 107         if (ocelot->ops->pcs_init)
 108                 ocelot->ops->pcs_init(ocelot, port);
 109 @@ -451,11 +455,11 @@ void ocelot_adjust_link(struct ocelot *o
 110
 111         /* Take MAC, Port, Phy (intern) and PCS (SGMII/Serdes) clock out of
 112          * reset */
 113 -       ocelot_port_writel(ocelot_port, DEV_CLOCK_CFG_LINK_SPEED(speed),
 114 +       ocelot_port_writel(ocelot_port, DEV_CLOCK_CFG_LINK_SPEED(mac_speed),
 115                            DEV_CLOCK_CFG);
 116
 117         /* No PFC */
 118 -       ocelot_write_gix(ocelot, ANA_PFC_PFC_CFG_FC_LINK_SPEED(speed),
 119 +       ocelot_write_gix(ocelot, ANA_PFC_PFC_CFG_FC_LINK_SPEED(mac_speed),
 120                          ANA_PFC_PFC_CFG, port);
 121
 122         /* Core: Enable port for frame transfer */
 123 @@ -469,7 +473,7 @@ void ocelot_adjust_link(struct ocelot *o
 124                          SYS_MAC_FC_CFG_RX_FC_ENA | SYS_MAC_FC_CFG_TX_FC_ENA |
 125                          SYS_MAC_FC_CFG_ZERO_PAUSE_ENA |
 126                          SYS_MAC_FC_CFG_FC_LATENCY_CFG(0x7) |
 127 -                        SYS_MAC_FC_CFG_FC_LINK_SPEED(speed),
 128 +                        SYS_MAC_FC_CFG_FC_LINK_SPEED(mac_speed),
 129                          SYS_MAC_FC_CFG, port);
 130         ocelot_write_rix(ocelot, 0, ANA_POL_FLOWC, port);
 131  }
 132 --- a/include/soc/mscc/ocelot.h
 133 +++ b/include/soc/mscc/ocelot.h
 134 @@ -404,6 +404,11 @@ enum ocelot_tag_prefix {
 135         OCELOT_TAG_PREFIX_LONG,
 136  };
 137
 138 +/* Hardware quirks (differences between switch instantiations) */
 139 +enum {
 140 +       OCELOT_PCS_PERFORMS_RATE_ADAPTATION     = BIT(0),
 141 +};
 142 +
 143  struct ocelot;
 144
 145  struct ocelot_ops {
 146 @@ -464,6 +469,8 @@ struct ocelot {
 147         struct delayed_work             stats_work;
 148         struct workqueue_struct         *stats_queue;
 149
 150 +       unsigned long                   quirks;
 151 +
 152         u8                              ptp:1;
 153         struct ptp_clock                *ptp_clock;
 154         struct ptp_clock_info           ptp_info;