net: dsa: bcm_sf2: disable RGMII interface(s) when link is down

When the link is down, disable the RGMII interface to conserve as much
power as possible. We re-enable the RGMII interface whenever the link is
detected.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index d9b7da545063..58b8fef25b96 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -506,6 +506,15 @@ static void bcm_sf2_sw_adjust_link(struct dsa_switch *ds, int port,
                 port_mode = EXT_REVMII;
                 break;
         default:
+                /* All other PHYs: internal and MoCA */
+                goto force_link;
+        }
+
+        /* If the link is down, just disable the interface to conserve power */
+        if (!phydev->link) {
+                reg = reg_readl(priv, REG_RGMII_CNTRL_P(port));
+                reg &= ~RGMII_MODE_EN;
+                reg_writel(priv, reg, REG_RGMII_CNTRL_P(port));
                 goto force_link;
         }