phylib: Fix auto-negotiation restart avoidance

A previous patch, 51e2a384, made
genphy_config_aneg() not restart aneg by calling genphy_restart_aneg() if
the advertisement hadn't changed.

But, genphy_restart_aneg() doesn't just restart aneg, it may also *enable*
aneg or un-isolate the PHY from the MII (those functions are controlled by
the same register).  The code to avoid calling genphy_restart_aneg() didn't
consider this.

So, modify genphy_config_aneg() to also check if the PHY needs to have aneg
enabled or be un-isolated before deciding not to restart aneg.

This caused a problem with certain Davicom PHYs, as that driver isolates
the PHY (why?) before calling genphy_config_aneg() and expects the PHY to
be un-isolated by that function.
Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Reported-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy_device.c

@@ -564,20 +564,32 @@ EXPORT_SYMBOL(genphy_restart_aneg);
  */
 int genphy_config_aneg(struct phy_device *phydev)
 {
-	int result = 0;
+	int result;
 
-	if (AUTONEG_ENABLE == phydev->autoneg) {
-		int result = genphy_config_advert(phydev);
+	if (AUTONEG_ENABLE != phydev->autoneg)
+		return genphy_setup_forced(phydev);
+
+	result = genphy_config_advert(phydev);
 
 	if (result < 0) /* error */
 		return result;
 
+	if (result == 0) {
+		/* Advertisment hasn't changed, but maybe aneg was never on to
+		 * begin with?  Or maybe phy was isolated? */
+		int ctl = phy_read(phydev, MII_BMCR);
+
+		if (ctl < 0)
+			return ctl;
+
+		if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
+			result = 1; /* do restart aneg */
+	}
+
 	/* Only restart aneg if we are advertising something different
 	 * than we were before.	 */
 	if (result > 0)
 		result = genphy_restart_aneg(phydev);
-	} else
-		result = genphy_setup_forced(phydev);
 
 	return result;
 }