broadcom: Make the 57780 IEEE compliant

This brings the 57780's phy into IEEE compliance by suppressing the
common mode oscillation.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 35 insertions, 2 deletions

diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index 3262a2474b07..f81e53222230 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -19,6 +19,11 @@
 
 #define PHY_ID_BCM50610         0x0143bd60
 #define PHY_ID_BCM50610M        0x0143bd70
+#define PHY_ID_BCM57780         0x03625d90
+
+#define BRCM_PHY_MODEL(phydev) \
+        ((phydev)->drv->phy_id & (phydev)->drv->phy_id_mask)
+
 
 #define MII_BCM54XX_ECR         0x10    /* BCM54xx extended control register */
 #define MII_BCM54XX_ECR_IM      0x1000  /* Interrupt mask */
@@ -118,6 +123,7 @@
 #define  MII_BCM54XX_EXP_EXP08_EARLY_DAC_WAKE   0x0200
 #define MII_BCM54XX_EXP_EXP75                   0x0f75
 #define  MII_BCM54XX_EXP_EXP75_VDACCTRL         0x003c
+#define  MII_BCM54XX_EXP_EXP75_CM_OSC           0x0001
 #define MII_BCM54XX_EXP_EXP96                   0x0f96
 #define  MII_BCM54XX_EXP_EXP96_MYST             0x0010
 #define MII_BCM54XX_EXP_EXP97                   0x0f97
@@ -194,7 +200,7 @@ static int bcm54xx_shadow_write(struct phy_device *phydev, u16 shadow, u16 val)
 }
 
 /* Indirect register access functions for the Expansion Registers */
-static int bcm54xx_exp_read(struct phy_device *phydev, u8 regnum)
+static int bcm54xx_exp_read(struct phy_device *phydev, u16 regnum)
 {
         int val;
 
@@ -308,6 +314,33 @@ static int bcm54xx_config_init(struct phy_device *phydev)
                         return err;
         }
 
+        if (BRCM_PHY_MODEL(phydev) == PHY_ID_BCM57780) {
+                int err2;
+
+                err = bcm54xx_auxctl_write(phydev,
+                                           MII_BCM54XX_AUXCTL_SHDWSEL_AUXCTL,
+                                           MII_BCM54XX_AUXCTL_ACTL_SMDSP_ENA |
+                                           MII_BCM54XX_AUXCTL_ACTL_TX_6DB);
+                if (err < 0)
+                        return err;
+
+                reg = bcm54xx_exp_read(phydev, MII_BCM54XX_EXP_EXP75);
+                if (reg < 0)
+                        goto error;
+
+                reg |= MII_BCM54XX_EXP_EXP75_CM_OSC;
+                err = bcm54xx_exp_write(phydev, MII_BCM54XX_EXP_EXP75, reg);
+
+error:
+                err2 = bcm54xx_auxctl_write(phydev,
+                                            MII_BCM54XX_AUXCTL_SHDWSEL_AUXCTL,
+                                            MII_BCM54XX_AUXCTL_ACTL_TX_6DB);
+                if (err)
+                        return err;
+                if (err2)
+                        return err2;
+        }
+
         return 0;
 }
 
@@ -694,7 +727,7 @@ static struct phy_driver bcm50610m_driver = {
 };
 
 static struct phy_driver bcm57780_driver = {
-        .phy_id         = 0x03625d90,
+        .phy_id         = PHY_ID_BCM57780,
         .phy_id_mask    = 0xfffffff0,
         .name           = "Broadcom BCM57780",
         .features       = PHY_GBIT_FEATURES |