tsec: Fix eTSEC2 link problem on P2020RDB

On P2020RDB eTSEC2 is connected to Vitesse VSC8221 PHY via SGMII.
Current TBI PHY settings for SGMII mode cause link problems on
this platform, link never comes up.

Fix this by making TBI PHY settings configurable and add a working
configuration for P2020RDB.

Signed-off-by: Felix Radensky <felix@embedded-sol.com>
Acked-by: Andy Fleming <afleming@freescale.com>

drivers/net/tsec.c

@@ -281,12 +281,16 @@ static uint tsec_local_mdio_read(volatile tsec_mdio_t *phyregs,
 		| TBIANA_FULL_DUPLEX \
 		)
 
-/* Force the TBI PHY into 1000Mbps full duplex when in SGMII mode */
+/* By default force the TBI PHY into 1000Mbps full duplex when in SGMII mode */
+#ifndef CONFIG_TSEC_TBICR_SETTINGS
 #define TBICR_SETTINGS ( \
 		TBICR_PHY_RESET \
 		| TBICR_FULL_DUPLEX \
 		| TBICR_SPEED1_SET \
 		)
+#else
+#define TBICR_SETTINGS CONFIG_TSEC_TBICR_SETTINGS
+#endif /* CONFIG_TSEC_TBICR_SETTINGS */
 
 /* Configure the TBI for SGMII operation */
 static void tsec_configure_serdes(struct tsec_private *priv)

include/configs/P1_P2_RDB.h

@@ -425,6 +425,15 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
 #define CONFIG_ETHPRIME		"eTSEC1"
 
 #define CONFIG_PHY_GIGE		1	/* Include GbE speed/duplex detection */
+
+/* TBI PHY configuration for SGMII mode */
+#define CONFIG_TSEC_TBICR_SETTINGS ( \
+		TBICR_PHY_RESET \
+		| TBICR_ANEG_ENABLE \
+		| TBICR_FULL_DUPLEX \
+		| TBICR_SPEED1_SET \
+		)
+
 #endif	/* CONFIG_TSEC_ENET */
 
 /*