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net: phy: smsc: Implement PHY config_init for LAN87xx 

The LAN8710/LAN8720 chips do have broken the "FlexPWR" smart power-saving
capability. Enabling it leads to the PHY not being able to detect Link when
cold-started without cable connected. Thus, make sure this is disabled.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Christian Hohnstaedt <chohnstaedt@innominate.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marek Vasut 2012-09-25 10:17:42 +00:00 committed by David S. Miller
parent a3cff128c9
commit b629820d18
1 changed files with 27 additions and 1 deletions
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28
drivers/net/phy/smsc.c
View File

@ -56,6 +56,32 @@ static int smsc_phy_config_init(struct phy_device *phydev)
return smsc_phy_ack_interrupt (phydev);
}
static int lan87xx_config_init(struct phy_device *phydev)
{
/*
* Make sure the EDPWRDOWN bit is NOT set. Setting this bit on
* LAN8710/LAN8720 PHY causes the PHY to misbehave, likely due
* to a bug on the chip.
*
* When the system is powered on with the network cable being
* disconnected all the way until after ifconfig ethX up is
* issued for the LAN port with this PHY, connecting the cable
* afterwards does not cause LINK change detection, while the
* expected behavior is the Link UP being detected.
*/
int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
if (rc < 0)
return rc;
rc &= ~MII_LAN83C185_EDPWRDOWN;
rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS, rc);
if (rc < 0)
return rc;
return smsc_phy_ack_interrupt(phydev);
}
static int lan911x_config_init(struct phy_device *phydev)
{
return smsc_phy_ack_interrupt(phydev);
@ -162,7 +188,7 @@ static struct phy_driver smsc_phy_driver[] = {
/* basic functions */
.config_aneg = genphy_config_aneg,
.read_status = genphy_read_status,
.config_init = smsc_phy_config_init,
.config_init = lan87xx_config_init,
/* IRQ related */
.ack_interrupt = smsc_phy_ack_interrupt,