tg3 / broadcom: Optionally disable TXC if no link

This patch adds code to disable the TXC and RXC reference clocks if link
is not available.

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

3 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index 7b10495fe8fb..f63c96a4ecb4 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -108,6 +108,7 @@
 #define BCM54XX_SHD_SCR3                0x05
 #define  BCM54XX_SHD_SCR3_DEF_CLK125    0x0001
 #define  BCM54XX_SHD_SCR3_DLLAPD_DIS    0x0002
+#define  BCM54XX_SHD_SCR3_TRDDAPD       0x0004
 
 /* 01010: Auto Power-Down */
 #define BCM54XX_SHD_APD                 0x0a
@@ -362,6 +363,9 @@ static void bcm54xx_adjust_rxrefclk(struct phy_device *phydev)
         else
                 val |= BCM54XX_SHD_SCR3_DLLAPD_DIS;
 
+        if (phydev->dev_flags & PHY_BRCM_DIS_TXCRXC_NOENRGY)
+                val |= BCM54XX_SHD_SCR3_TRDDAPD;
+
         if (orig != val)
                 bcm54xx_shadow_write(phydev, BCM54XX_SHD_SCR3, val);
 
@@ -409,6 +413,7 @@ static int bcm54xx_config_init(struct phy_device *phydev)
                 bcm54xx_shadow_write(phydev, BCM54XX_SHD_RGMII_MODE, 0);
 
         if ((phydev->dev_flags & PHY_BRCM_RX_REFCLK_UNUSED) ||
+            (phydev->dev_flags & PHY_BRCM_DIS_TXCRXC_NOENRGY) ||
             (phydev->dev_flags & PHY_BRCM_AUTO_PWRDWN_ENABLE))
                 bcm54xx_adjust_rxrefclk(phydev);
 
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index f74bf91e78cc..50bb53de5ebd 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -1103,6 +1103,7 @@ static int tg3_mdio_init(struct tg3 *tp)
         case TG3_PHY_ID_BCM50610M:
                 phydev->dev_flags |= PHY_BRCM_CLEAR_RGMII_MODE |
                                      PHY_BRCM_RX_REFCLK_UNUSED |
+                                     PHY_BRCM_DIS_TXCRXC_NOENRGY |
                                      PHY_BRCM_AUTO_PWRDWN_ENABLE;
                 if (tp->tg3_flags3 & TG3_FLG3_RGMII_STD_IBND_DISABLE)
                         phydev->dev_flags |= PHY_BRCM_STD_IBND_DISABLE;
diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index 59432278ded2..2b31b91f5871 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -9,4 +9,5 @@
 #define PHY_BRCM_EXT_IBND_RX_ENABLE     0x00001000
 #define PHY_BRCM_EXT_IBND_TX_ENABLE     0x00002000
 #define PHY_BRCM_CLEAR_RGMII_MODE       0x00004000
+#define PHY_BRCM_DIS_TXCRXC_NOENRGY     0x00008000
 #define PHY_BCM_FLAGS_VALID             0x80000000