From: Florian Fainelli <f.fainelli@gmail.com>
Date: Thu, 25 Sep 2014 00:05:19 +0000 (-0700)
Subject: net: dsa: bcm_sf2: disable RGMII interface(s) when link is down
X-Git-Tag: v4.9.8~5591^2~130^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7de1557ce7521e756974d5c28794c2375d28e3cc;p=platform%2Fkernel%2Flinux-rpi3.git

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>
---

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index d9b7da5..58b8fef 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;
 	}