net: phy: bcm7xx: add jumbo frame configuration to PHY

The BCM7XX PHY family requires special configuration to pass jumbo
frames. Do that during initial PHY setup.

Signed-off-by: Murali Krishna Policharla <murali.policharla@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/bcm-phy-lib.c b/drivers/net/phy/bcm-phy-lib.c
index e0d3310..e77b274 100644 (file)
--- a/drivers/net/phy/bcm-phy-lib.c
+++ b/drivers/net/phy/bcm-phy-lib.c
@@ -423,6 +423,28 @@ int bcm_phy_28nm_a0b0_afe_config_init(struct phy_device *phydev)
 }
 EXPORT_SYMBOL_GPL(bcm_phy_28nm_a0b0_afe_config_init);
 
+int bcm_phy_enable_jumbo(struct phy_device *phydev)
+{
+       int ret;
+
+       ret = bcm54xx_auxctl_read(phydev, MII_BCM54XX_AUXCTL_SHDWSEL_AUXCTL);
+       if (ret < 0)
+               return ret;
+
+       /* Enable extended length packet reception */
+       ret = bcm54xx_auxctl_write(phydev, MII_BCM54XX_AUXCTL_SHDWSEL_AUXCTL,
+                                  ret | MII_BCM54XX_AUXCTL_ACTL_EXT_PKT_LEN);
+       if (ret < 0)
+               return ret;
+
+       /* Enable the elastic FIFO for raising the transmission limit from
+        * 4.5KB to 10KB, at the expense of an additional 16 ns in propagation
+        * latency.
+        */
+       return phy_set_bits(phydev, MII_BCM54XX_ECR, MII_BCM54XX_ECR_FIFOE);
+}
+EXPORT_SYMBOL_GPL(bcm_phy_enable_jumbo);
+
 MODULE_DESCRIPTION("Broadcom PHY Library");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Broadcom Corporation");

diff --git a/drivers/net/phy/bcm-phy-lib.h b/drivers/net/phy/bcm-phy-lib.h
index c86fb9d..129df81 100644 (file)
--- a/drivers/net/phy/bcm-phy-lib.h
+++ b/drivers/net/phy/bcm-phy-lib.h
@@ -65,5 +65,6 @@ void bcm_phy_get_stats(struct phy_device *phydev, u64 *shadow,
                       struct ethtool_stats *stats, u64 *data);
 void bcm_phy_r_rc_cal_reset(struct phy_device *phydev);
 int bcm_phy_28nm_a0b0_afe_config_init(struct phy_device *phydev);
+int bcm_phy_enable_jumbo(struct phy_device *phydev);
 
 #endif /* _LINUX_BCM_PHY_LIB_H */

diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index af8eabe..692048d 100644 (file)
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -181,6 +181,10 @@ static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
        if (ret)
                return ret;
 
+       ret =  bcm_phy_enable_jumbo(phydev);
+       if (ret)
+               return ret;
+
        ret = bcm_phy_downshift_get(phydev, &count);
        if (ret)
                return ret;

diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index b475e7f..6462c54 100644 (file)
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -79,6 +79,7 @@
 #define MII_BCM54XX_ECR                0x10    /* BCM54xx extended control register */
 #define MII_BCM54XX_ECR_IM     0x1000  /* Interrupt mask */
 #define MII_BCM54XX_ECR_IF     0x0800  /* Interrupt force */
+#define MII_BCM54XX_ECR_FIFOE  0x0001  /* FIFO elasticity */
 
 #define MII_BCM54XX_ESR                0x11    /* BCM54xx extended status register */
 #define MII_BCM54XX_ESR_IS     0x1000  /* Interrupt status */
@@ -119,6 +120,7 @@
 #define MII_BCM54XX_AUXCTL_SHDWSEL_AUXCTL      0x00
 #define MII_BCM54XX_AUXCTL_ACTL_TX_6DB         0x0400
 #define MII_BCM54XX_AUXCTL_ACTL_SMDSP_ENA      0x0800
+#define MII_BCM54XX_AUXCTL_ACTL_EXT_PKT_LEN    0x4000
 
 #define MII_BCM54XX_AUXCTL_SHDWSEL_MISC                        0x07
 #define MII_BCM54XX_AUXCTL_SHDWSEL_MISC_WIRESPEED_EN   0x0010