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phy: micrel: Disable auto negotiation on startup

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Disable auto negotiation on init to properly detect an already plugged
cable at boot.

At boot, when the phy is started, it is in the PHY_UP state.
However, if a cable is plugged at boot, because auto negociation is already
enabled at the time we get the first interrupt, the phy is already running.
But the state machine then switches from PHY_UP to PHY_AN and calls
phy_start_aneg(). phy_start_aneg() will not do anything because aneg is
already enabled on the phy. It will then wait for a interrupt before going
further. This interrupt will never happen unless the cable is unplugged and
then replugged.

It was working properly before 321beec504 (net: phy: Use interrupts when
available in NOLINK state) because switching to NOLINK meant starting
polling the phy, even if IRQ were enabled.

Fixes: 321beec504 (net: phy: Use interrupts when available in NOLINK state)
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexandre Belloni 2016-02-26 19:18:23 +01:00 committed by David S. Miller
parent f5aba91d7f
commit 99f81afc13
1 changed files with 11 additions and 0 deletions
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11
drivers/net/phy/micrel.c
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@ -297,6 +297,17 @@ static int kszphy_config_init(struct phy_device *phydev)
if (priv->led_mode >= 0)
kszphy_setup_led(phydev, type->led_mode_reg, priv->led_mode);
if (phy_interrupt_is_valid(phydev)) {
int ctl = phy_read(phydev, MII_BMCR);
if (ctl < 0)
return ctl;
ret = phy_write(phydev, MII_BMCR, ctl & ~BMCR_ANENABLE);
if (ret < 0)
return ret;
}
return 0;
}