usb: asix: Move software resets to basic_init

The ASIX driver calls a basic_init() function during get_info(), so that
not all initialization tasks need to be redone on every init().
Unfortunately, the most important one is still triggered too often: the
driver does a full port and MII reset on every asix_init(), requiring up
to several seconds to reestablish the link.

This patch confines that software reset into the asix_basic_init()
function so that it will only be executed once. This saves about a
second of boot time on systems using BOOTP.

Note: this patch was previously submitted many moons ago as:

   usb: usbeth: asix: Do a fast init if link already established

That patch seens to have been lost or forgotten, so this is a rebased
version. It is tested on snow with a Asix USB dongle (Cisco).

Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>

drivers/usb/eth/asix.c

@@ -407,46 +407,40 @@ static int asix_basic_reset(struct ueth_data *dev)
 	rx_ctl = asix_read_rx_ctl(dev);
 	debug("RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);
 
-	return 0;
-}
-
-/*
- * Asix callbacks
- */
-static int asix_init(struct eth_device *eth, bd_t *bd)
-{
-	struct ueth_data	*dev = (struct ueth_data *)eth->priv;
-	int timeout = 0;
-#define TIMEOUT_RESOLUTION 50	/* ms */
-	int link_detected;
-
-	debug("** %s()\n", __func__);
-
 	dev->phy_id = asix_get_phy_addr(dev);
 	if (dev->phy_id < 0)
 		debug("Failed to read phy id\n");
 
-	if (asix_sw_reset(dev, AX_SWRESET_PRL) < 0)
-		goto out_err;
-
-	if (asix_sw_reset(dev, AX_SWRESET_IPRL | AX_SWRESET_PRL) < 0)
-		goto out_err;
-
 	asix_mdio_write(dev, dev->phy_id, MII_BMCR, BMCR_RESET);
 	asix_mdio_write(dev, dev->phy_id, MII_ADVERTISE,
 			ADVERTISE_ALL | ADVERTISE_CSMA);
 	mii_nway_restart(dev);
 
 	if (asix_write_medium_mode(dev, AX88772_MEDIUM_DEFAULT) < 0)
-		goto out_err;
+		return -1;
 
 	if (asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
 				AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
 				AX88772_IPG2_DEFAULT, 0, NULL) < 0) {
 		debug("Write IPG,IPG1,IPG2 failed\n");
-		goto out_err;
+		return -1;
 	}
 
+	return 0;
+}
+
+/*
+ * Asix callbacks
+ */
+static int asix_init(struct eth_device *eth, bd_t *bd)
+{
+	struct ueth_data	*dev = (struct ueth_data *)eth->priv;
+	int timeout = 0;
+#define TIMEOUT_RESOLUTION 50	/* ms */
+	int link_detected;
+
+	debug("** %s()\n", __func__);
+
 	if (asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL) < 0)
 		goto out_err;