linux-kernel - [PATCH 1/2] e100: power down PHY if WOL is not enabled

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Message-Id: <1323830996-16388-1-git-send-email-Jiang.Wang@riverbed.com>
Date:	Tue, 13 Dec 2011 18:49:55 -0800
From:	Jiang Wang <Jiang.Wang@...erbed.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	ppanchamukhi@...erbed.com, clala@...erbed.com,
	Francis.St.Amant@...erbed.com, miles.ito@...el.com,
	Jiang Wang <Jiang.Wang@...erbed.com>
Subject: [PATCH 1/2] e100: power down PHY if WOL is not enabled

Since the interface will not be used after being put down and WOL is disabled,
just power it off.
When bring up the interface, power on the PHY.

Signed-off-by: Jiang Wang <Jiang.Wang@...erbed.com>
---
 drivers/net/ethernet/intel/e100.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 5a2fdf7..9824e0a 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -1449,6 +1449,14 @@ static int e100_phy_init(struct nic *nic)
 		netif_printk(nic, hw, KERN_DEBUG, nic->netdev,
 			     "phy_addr = %d\n", nic->mii.phy_id);
 
+	/* Make sure power to the PHY is enabled */
+	if (!(nic->flags & wol_magic)) {
+		uint16_t phy_data;
+		phy_data = mdio_read(nic->netdev, nic->mii.phy_id, MII_BMCR);
+		phy_data &= ~BMCR_PDOWN;
+		mdio_write(nic->netdev, nic->mii.phy_id, MII_BMCR, phy_data);
+	}
+
 	/* Get phy ID */
 	id_lo = mdio_read(netdev, nic->mii.phy_id, MII_PHYSID1);
 	id_hi = mdio_read(netdev, nic->mii.phy_id, MII_PHYSID2);
@@ -2261,6 +2269,15 @@ static void e100_down(struct nic *nic)
 	napi_disable(&nic->napi);
 	netif_stop_queue(nic->netdev);
 	e100_hw_reset(nic);
+
+	/* If wake on LAN is not enabled, power down the PHY */
+	if (!(nic->flags & wol_magic)) {
+		uint16_t phy_data;
+		phy_data = mdio_read(nic->netdev, nic->mii.phy_id, MII_BMCR);
+		phy_data |= BMCR_PDOWN;
+		mdio_write(nic->netdev, nic->mii.phy_id, MII_BMCR, phy_data);
+	}
+
 	free_irq(nic->pdev->irq, nic->netdev);
 	del_timer_sync(&nic->watchdog);
 	netif_carrier_off(nic->netdev);
-- 
1.7.1

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