net: ravb: Initialize PHY in probe() once

Reset and initialize the PHY once in the probe() function rather than
doing it over and over again is start() function. This requires us to
keep the clock enabled while the driver is in use. This significantly
reduces the time between transfers as the PHY doesn't have to restart
autonegotiation between transfers, which takes forever.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/ravb.c

@@ -399,7 +399,7 @@ static int ravb_dmac_init(struct udevice *dev)
 static int ravb_config(struct udevice *dev)
 {
 	struct ravb_priv *eth = dev_get_priv(dev);
-	struct phy_device *phy;
+	struct phy_device *phy = eth->phydev;
 	u32 mask = ECMR_CHG_DM | ECMR_RE | ECMR_TE;
 	int ret;
 
@@ -410,13 +410,6 @@ static int ravb_config(struct udevice *dev)
 	ravb_mac_init(eth);
 	ravb_write_hwaddr(dev);
 
-	/* Configure phy */
-	ret = ravb_phy_config(dev);
-	if (ret)
-		return ret;
-
-	phy = eth->phydev;
-
 	ret = phy_startup(phy);
 	if (ret)
 		return ret;
@@ -443,10 +436,6 @@ static int ravb_start(struct udevice *dev)
 	struct ravb_priv *eth = dev_get_priv(dev);
 	int ret;
 
-	ret = clk_enable(&eth->clk);
-	if (ret)
-		return ret;
-
 	ret = ravb_reset(dev);
 	if (ret)
 		goto err;
@@ -473,8 +462,8 @@ static void ravb_stop(struct udevice *dev)
 {
 	struct ravb_priv *eth = dev_get_priv(dev);
 
+	phy_shutdown(eth->phydev);
 	ravb_reset(dev);
-	clk_disable(&eth->clk);
 }
 
 static int ravb_probe(struct udevice *dev)
@@ -512,8 +501,23 @@ static int ravb_probe(struct udevice *dev)
 
 	eth->bus = miiphy_get_dev_by_name(dev->name);
 
+	/* Bring up PHY */
+	ret = clk_enable(&eth->clk);
+	if (ret)
+		goto err_mdio_register;
+
+	ret = ravb_reset(dev);
+	if (ret)
+		goto err_mdio_reset;
+
+	ret = ravb_phy_config(dev);
+	if (ret)
+		goto err_mdio_reset;
+
 	return 0;
 
+err_mdio_reset:
+	clk_disable(&eth->clk);
 err_mdio_register:
 	mdio_free(mdiodev);
 err_mdio_alloc:
@@ -525,6 +529,8 @@ static int ravb_remove(struct udevice *dev)
 {
 	struct ravb_priv *eth = dev_get_priv(dev);
 
+	clk_disable(&eth->clk);
+
 	free(eth->phydev);
 	mdio_unregister(eth->bus);
 	mdio_free(eth->bus);