[patch 1/4] forcedeth: power down phy when interface is down
From: akpm@linux-foundation.org
Date: 2008-02-05 07:47:09
From: "Ed Swierk" <redacted> Bring the physical link down when the interface is down by placing the PHY in power-down state, unless WOL is enabled. This mirrors the behavior of other drivers including e1000 and tg3. Without the patch, ifconfig down leaves the physical link up, which confuses datacenter users who expect the link lights both on the NIC and the switch to go out when they bring an interface down. Furthermore, even though the phy is powered on, autonegotiation stops working, so a normally gigabit link might suddenly become 100 Mbit half-duplex when the interface goes down, and become gigabit when it comes up again. Ayaz said: I would not include this patch until further testing is performed. NVIDIA MCP chips use 3rd party PHY vendors. By powering down the phy, it could have adverse affects on certain phys. Signed-off-by: Ed Swierk <redacted> Cc: Jeff Garzik <redacted> Cc: Ayaz Abdulla <redacted> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> --- drivers/net/forcedeth.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff -puN drivers/net/forcedeth.c~forcedeth-power-down-phy-when-interface-is-down drivers/net/forcedeth.c
--- a/drivers/net/forcedeth.c~forcedeth-power-down-phy-when-interface-is-down
+++ a/drivers/net/forcedeth.c@@ -1324,9 +1324,9 @@ static int phy_init(struct net_device *d /* some phys clear out pause advertisment on reset, set it back */ mii_rw(dev, np->phyaddr, MII_ADVERTISE, reg); - /* restart auto negotiation */ + /* restart auto negotiation, power down phy */ mii_control = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ); - mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE); + mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE | BMCR_PDOWN); if (mii_rw(dev, np->phyaddr, MII_BMCR, mii_control)) { return PHY_ERROR; }
@@ -4803,6 +4803,10 @@ static int nv_open(struct net_device *de dprintk(KERN_DEBUG "nv_open: begin\n"); + /* power up phy */ + mii_rw(dev, np->phyaddr, MII_BMCR, + mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ) & ~BMCR_PDOWN); + /* erase previous misconfiguration */ if (np->driver_data & DEV_HAS_POWER_CNTRL) nv_mac_reset(dev);
@@ -4985,6 +4989,10 @@ static int nv_close(struct net_device *d if (np->wolenabled) { writel(NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR, base + NvRegPacketFilterFlags); nv_start_rx(dev); + } else { + /* power down phy */ + mii_rw(dev, np->phyaddr, MII_BMCR, + mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ)|BMCR_PDOWN); } /* FIXME: power down nic */
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