linux-kernel - [PATCH 2/2] e100: power off PHY after reset when interface is down

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Message-Id: <1323830996-16388-2-git-send-email-Jiang.Wang@riverbed.com>
Date:	Tue, 13 Dec 2011 18:49:56 -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 2/2] e100: power off PHY after reset when interface is down

PHYs supported by e100 re-starts auto-negotiation after writing to
BMCR_RESET bit. This patch powers down PHY when the interface is down
and reset is issued.

Signed-off-by: Jiang Wang <Jiang.Wang@...erbed.com>
---
 drivers/net/ethernet/intel/e100.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 9824e0a..b8e4910 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -2386,6 +2386,13 @@ static int e100_set_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
 	err = mii_ethtool_sset(&nic->mii, cmd);
 	e100_exec_cb(nic, NULL, e100_configure);
 
+	if (!netif_running(netdev) && !(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);
+	}
+
 	return err;
 }
 
-- 
1.7.1

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