package/boot/uboot-mediatek/patches/101-16-net-mediatek-connect-switch-to-PSE-only-when-startin.patch

   1 From a0405999ebecf21ed9f76f1dc9420682cd3feba0 Mon Sep 17 00:00:00 2001
   2 From: Weijie Gao <weijie.gao@mediatek.com>
   3 Date: Wed, 19 Jul 2023 17:16:54 +0800
   4 Subject: [PATCH 16/29] net: mediatek: connect switch to PSE only when starting
   5  eth is requested
   6
   7 So far the switch is initialized in probe stage and is connected to PSE
   8 unconditionally. This will cause all packets being flooded to PSE and may
   9 cause PSE hang before entering linux.
  10
  11 This patch changes the connection between switch and PSE:
  12 - Still initialize switch in probe stage, but disconnect it with PSE
  13 - Connect switch with PSE on eth start
  14 - Disconnect on eth stop
  15
  16 Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
  17 ---
  18  drivers/net/mtk_eth.c | 44 ++++++++++++++++++++++++++++++++++++++++---
  19  1 file changed, 41 insertions(+), 3 deletions(-)
  20
  21 --- a/drivers/net/mtk_eth.c
  22 +++ b/drivers/net/mtk_eth.c
  23 @@ -123,8 +123,10 @@ struct mtk_eth_priv {
  24
  25         enum mtk_switch sw;
  26         int (*switch_init)(struct mtk_eth_priv *priv);
  27 +       void (*switch_mac_control)(struct mtk_eth_priv *priv, bool enable);
  28         u32 mt753x_smi_addr;
  29         u32 mt753x_phy_base;
  30 +       u32 mt753x_pmcr;
  31
  32         struct gpio_desc rst_gpio;
  33         int mcm;
  34 @@ -613,6 +615,16 @@ static int mt7530_pad_clk_setup(struct m
  35         return 0;
  36  }
  37
  38 +static void mt7530_mac_control(struct mtk_eth_priv *priv, bool enable)
  39 +{
  40 +       u32 pmcr = FORCE_MODE;
  41 +
  42 +       if (enable)
  43 +               pmcr = priv->mt753x_pmcr;
  44 +
  45 +       mt753x_reg_write(priv, PMCR_REG(6), pmcr);
  46 +}
  47 +
  48  static int mt7530_setup(struct mtk_eth_priv *priv)
  49  {
  50         u16 phy_addr, phy_val;
  51 @@ -663,11 +675,14 @@ static int mt7530_setup(struct mtk_eth_p
  52               FORCE_DPX | FORCE_LINK;
  53
  54         /* MT7530 Port6: Forced 1000M/FD, FC disabled */
  55 -       mt753x_reg_write(priv, PMCR_REG(6), val);
  56 +       priv->mt753x_pmcr = val;
  57
  58         /* MT7530 Port5: Forced link down */
  59         mt753x_reg_write(priv, PMCR_REG(5), FORCE_MODE);
  60
  61 +       /* Keep MAC link down before starting eth */
  62 +       mt753x_reg_write(priv, PMCR_REG(6), FORCE_MODE);
  63 +
  64         /* MT7530 Port6: Set to RGMII */
  65         mt753x_reg_rmw(priv, MT7530_P6ECR, P6_INTF_MODE_M, P6_INTF_MODE_RGMII);
  66
  67 @@ -823,6 +838,17 @@ static void mt7531_phy_setting(struct mt
  68         }
  69  }
  70
  71 +static void mt7531_mac_control(struct mtk_eth_priv *priv, bool enable)
  72 +{
  73 +       u32 pmcr = FORCE_MODE_LNK;
  74 +
  75 +       if (enable)
  76 +               pmcr = priv->mt753x_pmcr;
  77 +
  78 +       mt753x_reg_write(priv, PMCR_REG(5), pmcr);
  79 +       mt753x_reg_write(priv, PMCR_REG(6), pmcr);
  80 +}
  81 +
  82  static int mt7531_setup(struct mtk_eth_priv *priv)
  83  {
  84         u16 phy_addr, phy_val;
  85 @@ -882,8 +908,11 @@ static int mt7531_setup(struct mtk_eth_p
  86                (SPEED_1000M << FORCE_SPD_S) | FORCE_DPX |
  87                FORCE_LINK;
  88
  89 -       mt753x_reg_write(priv, PMCR_REG(5), pmcr);
  90 -       mt753x_reg_write(priv, PMCR_REG(6), pmcr);
  91 +       priv->mt753x_pmcr = pmcr;
  92 +
  93 +       /* Keep MAC link down before starting eth */
  94 +       mt753x_reg_write(priv, PMCR_REG(5), FORCE_MODE_LNK);
  95 +       mt753x_reg_write(priv, PMCR_REG(6), FORCE_MODE_LNK);
  96
  97         /* Turn on PHYs */
  98         for (i = 0; i < MT753X_NUM_PHYS; i++) {
  99 @@ -1227,6 +1256,9 @@ static int mtk_eth_start(struct udevice
 100
 101         mtk_eth_fifo_init(priv);
 102
 103 +       if (priv->switch_mac_control)
 104 +               priv->switch_mac_control(priv, true);
 105 +
 106         /* Start PHY */
 107         if (priv->sw == SW_NONE) {
 108                 ret = mtk_phy_start(priv);
 109 @@ -1245,6 +1277,9 @@ static void mtk_eth_stop(struct udevice
 110  {
 111         struct mtk_eth_priv *priv = dev_get_priv(dev);
 112
 113 +       if (priv->switch_mac_control)
 114 +               priv->switch_mac_control(priv, false);
 115 +
 116         mtk_pdma_rmw(priv, PDMA_GLO_CFG_REG,
 117                      TX_WB_DDONE | RX_DMA_EN | TX_DMA_EN, 0);
 118         udelay(500);
 119 @@ -1484,16 +1519,19 @@ static int mtk_eth_of_to_plat(struct ude
 120         /* check for switch first, otherwise phy will be used */
 121         priv->sw = SW_NONE;
 122         priv->switch_init = NULL;
 123 +       priv->switch_mac_control = NULL;
 124         str = dev_read_string(dev, "mediatek,switch");
 125
 126         if (str) {
 127                 if (!strcmp(str, "mt7530")) {
 128                         priv->sw = SW_MT7530;
 129                         priv->switch_init = mt7530_setup;
 130 +                       priv->switch_mac_control = mt7530_mac_control;
 131                         priv->mt753x_smi_addr = MT753X_DFL_SMI_ADDR;
 132                 } else if (!strcmp(str, "mt7531")) {
 133                         priv->sw = SW_MT7531;
 134                         priv->switch_init = mt7531_setup;
 135 +                       priv->switch_mac_control = mt7531_mac_control;
 136                         priv->mt753x_smi_addr = MT753X_DFL_SMI_ADDR;
 137                 } else {
 138                         printf("error: unsupported switch\n");