netdev - [PATCH 1/3] phy/marvell: Make non-aneg speed/duplex forcing work for 88E1111 PHYs

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Date:	Thu, 10 Sep 2009 06:01:30 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	David Miller <davem@...emloft.net>
Cc:	Andy Fleming <afleming@...escale.com>,
	Timur Tabi <timur@...escale.com>,
	Li Yang <leoli@...escale.com>,
	Kumar Gala <galak@...nel.crashing.org>, netdev@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: [PATCH 1/3] phy/marvell: Make non-aneg speed/duplex forcing work
 for 88E1111 PHYs

According to specs, when auto-negotiation is disabled, Marvell PHYs need
a software reset after changing speed/duplex forcing bits. Otherwise,
the modified bits have no effect.

Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
---
 drivers/net/phy/marvell.c |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index dd6f54d..6f69b9b 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -155,8 +155,27 @@ static int marvell_config_aneg(struct phy_device *phydev)
 		return err;
 
 	err = genphy_config_aneg(phydev);
+	if (err < 0)
+		return err;
 
-	return err;
+	if (phydev->autoneg != AUTONEG_ENABLE) {
+		int bmcr;
+
+		/*
+		 * A write to speed/duplex bits (that is performed by
+		 * genphy_config_aneg() call above) must be followed by
+		 * a software reset. Otherwise, the write has no effect.
+		 */
+		bmcr = phy_read(phydev, MII_BMCR);
+		if (bmcr < 0)
+			return bmcr;
+
+		err = phy_write(phydev, MII_BMCR, bmcr | BMCR_RESET);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
 }
 
 static int m88e1121_config_aneg(struct phy_device *phydev)
-- 
1.6.3.3

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