ag71xx: replace fixed PHY reset wait time in ar7240sw_setup

Replace the fixed wait time of 1s with polling for BMCR_RESET
to be cleared on all PHYs.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

SVN-Revision: 43538

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_ar7240.c

@@ -618,6 +618,31 @@ static void ar7240sw_setup(struct ar7240sw *as)
 	ar7240sw_reg_rmw(mii, AR7240_REG_SERVICE_TAG, AR7240_SERVICE_TAG_M, 0);
 }
 
+/* inspired by phy_poll_reset in drivers/net/phy/phy_device.c */
+static int
+ar7240sw_phy_poll_reset(struct mii_bus *bus)
+{
+	const unsigned int sleep_msecs = 20;
+	int ret, elapsed, i;
+
+	for (elapsed = sleep_msecs; elapsed <= 600;
+	     elapsed += sleep_msecs) {
+		msleep(sleep_msecs);
+		for (i = 0; i < AR7240_NUM_PHYS; i++) {
+			ret = ar7240sw_phy_read(bus, i, MII_BMCR);
+			if (ret < 0)
+				return ret;
+			if (ret & BMCR_RESET)
+				break;
+			if (i == AR7240_NUM_PHYS - 1) {
+				usleep_range(1000, 2000);
+				return 0;
+			}
+		}
+	}
+	return -ETIMEDOUT;
+}
+
 static int ar7240sw_reset(struct ar7240sw *as)
 {
 	struct mii_bus *mii = as->mii_bus;
@@ -646,7 +671,9 @@ static int ar7240sw_reset(struct ar7240sw *as)
 		ar7240sw_phy_write(mii, i, MII_BMCR,
 				   BMCR_RESET | BMCR_ANENABLE);
 	}
-	msleep(1000);
+	ret = ar7240sw_phy_poll_reset(mii);
+	if (ret)
+		return ret;
 
 	ar7240sw_setup(as);
 	return ret;