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, 2 insertions, 29 deletions

diff --git a/drivers/net/phy/rockchip.c b/drivers/net/phy/rockchip.c
index 95abf7072f32..9053b1d01906 100644
--- a/drivers/net/phy/rockchip.c
+++ b/drivers/net/phy/rockchip.c
@@ -104,41 +104,14 @@ static int rockchip_integrated_phy_config_init(struct phy_device *phydev)
 
 static void rockchip_link_change_notify(struct phy_device *phydev)
 {
-	int speed = SPEED_10;
-
-	if (phydev->autoneg == AUTONEG_ENABLE) {
-		int reg = phy_read(phydev, MII_SPECIAL_CONTROL_STATUS);
-
-		if (reg < 0) {
-			phydev_err(phydev, "phy_read err: %d.\n", reg);
-			return;
-		}
-
-		if (reg & MII_SPEED_100)
-			speed = SPEED_100;
-		else if (reg & MII_SPEED_10)
-			speed = SPEED_10;
-	} else {
-		int bmcr = phy_read(phydev, MII_BMCR);
-
-		if (bmcr < 0) {
-			phydev_err(phydev, "phy_read err: %d.\n", bmcr);
-			return;
-		}
-
-		if (bmcr & BMCR_SPEED100)
-			speed = SPEED_100;
-		else
-			speed = SPEED_10;
-	}
-
 	/*
 	 * If mode switch happens from 10BT to 100BT, all DSP/AFE
 	 * registers are set to default values. So any AFE/DSP
 	 * registers have to be re-initialized in this case.
 	 */
-	if ((phydev->speed == SPEED_10) && (speed == SPEED_100)) {
+	if (phydev->state == PHY_RUNNING && phydev->speed == SPEED_100) {
 		int ret = rockchip_integrated_phy_analog_init(phydev);
+
 		if (ret)
 			phydev_err(phydev, "rockchip_integrated_phy_analog_init err: %d.\n",
 				   ret);