netdev - RE: [patch 02/10] forcedeth: power down phy when interface is down

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Date:	Thu, 13 Dec 2007 16:11:55 -0800
From:	"Ayaz Abdulla" <AAbdulla@...dia.com>
To:	<akpm@...ux-foundation.org>, <jeff@...zik.org>
Cc:	<netdev@...r.kernel.org>, <eswierk@...stra.com>
Subject: RE: [patch 02/10] forcedeth: power down phy when interface is down

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.

Ayaz


-----Original Message-----
From: akpm@...ux-foundation.org [mailto:akpm@...ux-foundation.org] 
Sent: Thursday, December 13, 2007 4:03 PM
To: jeff@...zik.org
Cc: netdev@...r.kernel.org; akpm@...ux-foundation.org;
eswierk@...stra.com; Ayaz Abdulla
Subject: [patch 02/10] forcedeth: power down phy when interface is down


From: "Ed Swierk" <eswierk@...stra.com>

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.

Signed-off-by: Ed Swierk <eswierk@...stra.com>
Cc: Jeff Garzik <jeff@...zik.org>
Cc: Ayaz Abdulla <aabdulla@...dia.com>
Signed-off-by: Andrew Morton <akpm@...ux-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-dow
n
+++ a/drivers/net/forcedeth.c
@@ -1312,9 +1312,9 @@ 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;
 	}
@@ -4798,6 +4798,10 @@ 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);
@@ -4980,6 +4984,10 @@ 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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