linux-kernel - [PATCH regression] net: phy: fix initialization (config

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Message-Id: <1396396559-6971-1-git-send-email-holler@ahsoftware.de>
Date:	Wed,  2 Apr 2014 01:55:59 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
	Michal Simek <michal.simek@...inx.com>,
	Alexander Holler <holler@...oftware.de>,
	<stable@...r.kernel.org>
Subject: [PATCH regression] net: phy: fix initialization (config_init) for Marvel 88E1116R PHYs

Commit 7cd1463664c2a15721ff4ccfb61d4d970815cb3d (introduced with 3.14)
changed the initialization of the mv643xx_eth driver to use phy_init_hw()
to reset the PHY. Unfortunately the initialization for the 88E1116R PHY
was broken such, that it used mdelay() instead of really waiting for a
reset to finish.

The effect was that the ethernet on my Kirkwood 88F6281 based device didn't
come up anymore (no carrier).

Fix this by waiting for a reset to finish before proceeding further.

Signed-off-by: Alexander Holler <holler@...oftware.de>

Cc: Michal Simek <michal.simek@...inx.com>
Cc: Florian Fainelli <f.fainelli@...il.com>
Cc: <stable@...r.kernel.org>
---
 drivers/net/phy/marvell.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index bd37e45..5b84808 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -396,7 +396,9 @@ static int m88e1116r_config_init(struct phy_device *phydev)
 	if (err < 0)
 		return err;
 
-	mdelay(500);
+	do
+		temp = phy_read(phydev, MII_BMCR);
+	while (temp & BMCR_RESET);
 
 	err = phy_write(phydev, MII_MARVELL_PHY_PAGE, 0);
 	if (err < 0)
@@ -429,7 +431,9 @@ static int m88e1116r_config_init(struct phy_device *phydev)
 	if (err < 0)
 		return err;
 
-	mdelay(500);
+	do
+		temp = phy_read(phydev, MII_BMCR);
+	while (temp & BMCR_RESET);
 
 	return 0;
 }
-- 
1.8.3.1

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