net: phy: improve handling link_change_notify callback

Currently the Phy driver's link_change_notify callback is called
whenever the state machine is run (every second if polling), no matter
whether the state changed or not. This isn't needed and may confuse
users considering the name of the callback. Actually it contradicts
its kernel-doc description. Therefore let's change the behavior and
call this callback only in case of an actual state change.

This requires changes to the at803x and rockchip drivers.
at803x can be simplified so that it reacts on a state change to
PHY_NOLINK only.
The rockchip driver can also be much simplified. We simply re-init
the AFE/DSP registers whenever we change to PHY_RUNNING and speed
is 100Mbps. This causes very small overhead because we do this even
if the speed was 100Mbps already. But this is negligible and
I think justified by the much simpler code.

Changes are compile-tested only.

A little bit problematic seems to be to find somebody with the
hardware to test the changes to the two PHY drivers. See also [0].
David may be able to test the Rockchip driver.

[0] https://marc.info/?t=153782508800006&r=1&w=2

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 17 deletions

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index f3e96191eb6f..f315ab468a0d 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -324,8 +324,6 @@ static int at803x_config_intr(struct phy_device *phydev)
 
 static void at803x_link_change_notify(struct phy_device *phydev)
 {
-	struct at803x_priv *priv = phydev->priv;
-
 	/*
 	 * Conduct a hardware reset for AT8030 every time a link loss is
 	 * signalled. This is necessary to circumvent a hardware bug that
@@ -333,25 +331,19 @@ static void at803x_link_change_notify(struct phy_device *phydev)
 	 * in the FIFO. In such cases, the FIFO enters an error mode it
 	 * cannot recover from by software.
 	 */
-	if (phydev->state == PHY_NOLINK) {
-		if (phydev->mdio.reset && !priv->phy_reset) {
-			struct at803x_context context;
+	if (phydev->state == PHY_NOLINK && phydev->mdio.reset) {
+		struct at803x_context context;
 
-			at803x_context_save(phydev, &context);
+		at803x_context_save(phydev, &context);
 
-			phy_device_reset(phydev, 1);
-			msleep(1);
-			phy_device_reset(phydev, 0);
-			msleep(1);
+		phy_device_reset(phydev, 1);
+		msleep(1);
+		phy_device_reset(phydev, 0);
+		msleep(1);
 
-			at803x_context_restore(phydev, &context);
+		at803x_context_restore(phydev, &context);
 
-			phydev_dbg(phydev, "%s(): phy was reset\n",
-				   __func__);
-			priv->phy_reset = true;
-		}
-	} else {
-		priv->phy_reset = false;
+		phydev_dbg(phydev, "%s(): phy was reset\n", __func__);
 	}
 }