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>

1 files changed, 26 insertions, 1 deletions

diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index fdce1ea28790..29e256a4ed57 100644
--- 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)