target/linux/bcm27xx/patches-5.4/950-0473-net-bcmgenet-Clear-ID_MODE_DIS-in-EXT_RGMII_OOB_CTRL.patch

   1 From cff8c5c2a95a4afd65bfa3198258d03bc790cddb Mon Sep 17 00:00:00 2001
   2 From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
   3 Date: Tue, 25 Feb 2020 14:11:59 +0100
   4 Subject: [PATCH] net: bcmgenet: Clear ID_MODE_DIS in
   5  EXT_RGMII_OOB_CTRL when not needed
   6
   7 commit 402482a6a78e5c61d8a2ec6311fc5b4aca392cd6 upstream.
   8
   9 Outdated Raspberry Pi 4 firmware might configure the external PHY as
  10 rgmii although the kernel currently sets it as rgmii-rxid. This makes
  11 connections unreliable as ID_MODE_DIS is left enabled. To avoid this,
  12 explicitly clear that bit whenever we don't need it.
  13
  14 Fixes: da38802211cc ("net: bcmgenet: Add RGMII_RXID support")
  15 Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  16 Acked-by: Florian Fainelli <f.fainelli@gmail.com>
  17 Signed-off-by: David S. Miller <davem@davemloft.net>
  18 Signed-off-by: Matthias Reichl <hias@horus.com>
  19 ---
  20  drivers/net/ethernet/broadcom/genet/bcmmii.c | 1 +
  21  1 file changed, 1 insertion(+)
  22
  23 --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
  24 +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
  25 @@ -292,6 +292,7 @@ int bcmgenet_mii_config(struct net_devic
  26          */
  27         if (priv->ext_phy) {
  28                 reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
  29 +               reg &= ~ID_MODE_DIS;
  30                 reg |= id_mode_dis;
  31                 if (GENET_IS_V1(priv) || GENET_IS_V2(priv) || GENET_IS_V3(priv))
  32                         reg |= RGMII_MODE_EN_V123;