target/linux/bcm27xx/patches-6.1/950-0513-net-bcmgenet-Add-eee-module-parameter.patch

   1 From d69cdb1cc4e3f717f63910cb2c40ca26f912ea34 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Wed, 14 Dec 2022 15:00:51 +0000
   4 Subject: [PATCH] net: bcmgenet: Add 'eee' module parameter
   5
   6 On some switches, having EEE enabled causes the link to become
   7 unstable. With this patch, adding 'genet.eee=N' to the kernel command
   8 line will cause EEE to be disabled on the link.
   9
  10 See: https://github.com/raspberrypi/linux/issues/4289
  11
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  13 ---
  14  drivers/net/ethernet/broadcom/genet/bcmgenet.c | 14 ++++++++++++++
  15  1 file changed, 14 insertions(+)
  16
  17 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
  18 +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
  19 @@ -70,6 +70,9 @@ static void bcmgenet_set_rx_mode(struct
  20  static bool skip_umac_reset = false;
  21  module_param(skip_umac_reset, bool, 0444);
  22  MODULE_PARM_DESC(skip_umac_reset, "Skip UMAC reset step");
  23 +static bool eee = true;
  24 +module_param(eee, bool, 0444);
  25 +MODULE_PARM_DESC(eee, "Enable EEE (default Y)");
  26
  27  static inline void bcmgenet_writel(u32 value, void __iomem *offset)
  28  {
  29 @@ -3441,6 +3444,17 @@ static int bcmgenet_open(struct net_devi
  30
  31         bcmgenet_phy_pause_set(dev, priv->rx_pause, priv->tx_pause);
  32
  33 +       if (!eee) {
  34 +               struct ethtool_eee eee_data;
  35 +
  36 +               ret = bcmgenet_get_eee(dev, &eee_data);
  37 +               if (ret == 0) {
  38 +                       eee_data.eee_enabled = 0;
  39 +                       bcmgenet_set_eee(dev, &eee_data);
  40 +                       netdev_warn(dev, "EEE disabled\n");
  41 +               }
  42 +       }
  43 +
  44         bcmgenet_netif_start(dev);
  45
  46         netif_tx_start_all_queues(dev);