netdev - [net-next PATCH] bnx2x: Fix link problem with some DACs

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Message-ID: <1276590163.13056.32.camel@lb-tlvb-yanivr.il.broadcom.com>
Date:	Tue, 15 Jun 2010 11:22:43 +0300
From:	"Yaniv Rosner" <yanivr@...adcom.com>
To:	davem@...emloft.net
cc:	netdev@...r.kernel.org, ole@....pl, eilong@...adcom.com
Subject: [net-next PATCH] bnx2x: Fix link problem with some DACs

Change 2wire transfer rate of SFP+ module EEPROM from 400Khz to 100Khz since some DACs(direct attached cables) do not work at 400Khz.

Reported-by: Krzysztof Oldzki <ole@....pl>
Signed-off-by: Yaniv Rosner <yanivr@...adcom.com>
Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
---
diff --git a/drivers/net/bnx2x_link.c b/drivers/net/bnx2x_link.c
index ff70be8..0383e30 100644
--- a/drivers/net/bnx2x_link.c
+++ b/drivers/net/bnx2x_link.c
@@ -4266,14 +4266,16 @@ static u8 bnx2x_ext_phy_init(struct link_params *params, struct link_vars *vars)
 					       MDIO_PMA_REG_10G_CTRL2, 0x0008);
 			}
 
-			/* Set 2-wire transfer rate to 400Khz since 100Khz
-			is not operational */
+			/* Set 2-wire transfer rate of SFP+ module EEPROM
+			 * to 100Khz since some DACs(direct attached cables) do
+			 * not work at 400Khz.
+			 */
 			bnx2x_cl45_write(bp, params->port,
 				       ext_phy_type,
 				       ext_phy_addr,
 				       MDIO_PMA_DEVAD,
 				       MDIO_PMA_REG_8727_TWO_WIRE_SLAVE_ADDR,
-				       0xa101);
+				       0xa001);
 
 			/* Set TX PreEmphasis if needed */
 			if ((params->feature_config_flags &



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