linux-kernel - [PATCH 3.13.y-ckt 117/122] net: dp83640: fix broken calibration routine.

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Date:	Wed, 17 Jun 2015 15:29:04 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Richard Cochran <richardcochran@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 117/122] net: dp83640: fix broken calibration routine.

3.13.11-ckt22 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Cochran <richardcochran@...il.com>

[ Upstream commit 397a253af5031de4a4612210055935309af4472c ]

Currently, the calibration function that corrects the initial offsets
among multiple devices only works the first time.  If the function is
called more than once, the calibration fails and bogus offsets will be
programmed into the devices.

In a well hidden spot, the device documentation tells that trigger indexes
0 and 1 are special in allowing the TRIG_IF_LATE flag to actually work.

This patch fixes the issue by using one of the special triggers during the
recalibration method.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/phy/dp83640.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 7490b6c..d2907a6 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -45,7 +45,7 @@
 #define PSF_TX		0x1000
 #define EXT_EVENT	1
 #define CAL_EVENT	7
-#define CAL_TRIGGER	7
+#define CAL_TRIGGER	1
 #define PER_TRIGGER	6
 
 #define MII_DP83640_MICR 0x11
-- 
1.9.1

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