stmmac: add delay for JL2XX1 Gigabit Ethernet PHY

This adds optional 1.5s delay to stmmac driver which can be
enabled through Kconfig CONFIG_STMMAC_JL2XX1=y which will be
applied only when the ethernet PHY ID matches JL2XX1 or JL2101

Co-authored-by: Portisch <hugo.portisch@yahoo.de>

drivers/net/ethernet/stmicro/stmmac/Kconfig

@@ -29,6 +29,16 @@ config STMMAC_PLATFORM
 
 if STMMAC_PLATFORM
 
+config STMMAC_JL2XX1
+	bool "Allow STMMAC delay for JL2XX1/JL2101 Gigabit Ethernet PHY"
+	default n
+	depends on STMMAC_PLATFORM
+	---help---
+	  This allows the STMMAC driver to be delayed for 1.5 seconds
+	  if the PHY JL2XX1/JL2101 is found so they can be properly
+	  initialized. This is only applied to the specific PHY IDs
+	  so other PHY won't be affected.
+
 config DWMAC_GENERIC
 	tristate "Generic driver for DWMAC"
 	default STMMAC_PLATFORM

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -136,6 +136,12 @@ static void stmmac_exit_fs(struct net_device *dev);
 #define TX_MONITOR
 #endif
 
+/* PHY ID for JL2XX1 and JL2101, these are used for special initialization modifications for them */
+#ifdef CONFIG_STMMAC_JL2XX1
+#define JL2XX1_PHY_ID	0x937c4030
+#define JL2101_PHY_ID	0x937c4032
+#endif
+
 #ifdef TX_MONITOR
 static struct workqueue_struct *moniter_tx_wq;
 static struct delayed_work moniter_tx_worker;
@@ -1658,6 +1664,11 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 	if (priv->extend_desc && (priv->mode == STMMAC_RING_MODE))
 		atds = 1;
 
+#ifdef CONFIG_STMMAC_JL2XX1
+	if (priv->phydev->phy_id == JL2XX1_PHY_ID || priv->phydev->phy_id == JL2101_PHY_ID)
+		msleep(1500);
+#endif
+
 	ret = priv->hw->dma->reset(priv->ioaddr);
 	if (ret) {
 		dev_err(priv->device, "Failed to reset the dma\n");