net: phy: bcm7xxx: enable auto power down

The 28nm process BCM7xxx internal Gigabit PHYs all support automatic
power down, turn on that feature as part of the configuration
initialization callback.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index fdce1ea28790c4e9ae0d56e9995d1a299782f4ec..29e256a4ed57a02e448fd87f066697c743daed51 100644 (file)
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -146,6 +146,27 @@ static int bcm7xxx_28nm_afe_config_init(struct phy_device *phydev)
        return 0;
 }
 
+static int bcm7xxx_apd_enable(struct phy_device *phydev)
+{
+       int val;
+
+       /* Enable powering down of the DLL during auto-power down */
+       val = bcm54xx_shadow_read(phydev, BCM54XX_SHD_SCR3);
+       if (val < 0)
+               return val;
+
+       val |= BCM54XX_SHD_SCR3_DLLAPD_DIS;
+       bcm54xx_shadow_write(phydev, BCM54XX_SHD_SCR3, val);
+
+       /* Enable auto-power down */
+       val = bcm54xx_shadow_read(phydev, BCM54XX_SHD_APD);
+       if (val < 0)
+               return val;
+
+       val |= BCM54XX_SHD_APD_EN;
+       return bcm54xx_shadow_write(phydev, BCM54XX_SHD_APD, val);
+}
+
 static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
 {
        int ret;
@@ -154,7 +175,11 @@ static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
        if (ret)
                return ret;
 
-       return bcm7xxx_28nm_afe_config_init(phydev);
+       ret = bcm7xxx_28nm_afe_config_init(phydev);
+       if (ret)
+               return ret;
+
+       return bcm7xxx_apd_enable(phydev);
 }
 
 static int bcm7xxx_28nm_resume(struct phy_device *phydev)