netdev - [PATCH v2] net: fec: Adjust ENET MDIO timeouts

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Message-Id: <1325012021-3134-1-git-send-email-festevam@gmail.com>
Date:	Tue, 27 Dec 2011 16:53:41 -0200
From:	Fabio Estevam <festevam@...il.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, shawn.guo@...escale.com,
	kernel@...gutronix.de,
	Rogerio Pimentel <rogerio.pimentel@...escale.com>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: [PATCH v2] net: fec: Adjust ENET MDIO timeouts

On extensive NFS boots on a mx6qsabrelite board it was noted that "FEC: MDIO read timeout" were occuring,
which caused failure on loading the FEC driver.

The original FEC_MII_TIMEOUT was set to 1 ms, which is too low when passed to the usecs_to_jiffies macro.

On ARM one jiffy is 10ms, so use a timeout of 30ms, which corresponds to 3 jiffies.

After running extensive NFS boots, the MDIO timeouts do not occur anymore with this change.

Signed-off-by: Rogerio Pimentel <rogerio.pimentel@...escale.com>
Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
---
Changes since v1:
- Keep the timeout unit in us.

 drivers/net/ethernet/freescale/fec.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index c136230..c54cc62 100644
--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -255,7 +255,7 @@ struct fec_enet_private {
 #define FEC_MMFR_TA		(2 << 16)
 #define FEC_MMFR_DATA(v)	(v & 0xffff)
 
-#define FEC_MII_TIMEOUT		1000 /* us */
+#define FEC_MII_TIMEOUT		30000 /* us */
 
 /* Transmitter timeout */
 #define TX_TIMEOUT (2 * HZ)
-- 
1.7.1

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