From 554f5e2a32cd5b13627d1da10b11b242de046a70 Mon Sep 17 00:00:00 2001
From: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Date: Mon, 23 Mar 2015 18:22:13 +0800
Subject: fsl/mdio: fixup xgmac_mdio_read for rtl8211f on t1023rdb

Read RTL8211F PHY registers(e.g. PHY_ID, MII_STAT1000) will fail
with xgmac_mdio_read on T1023RDB. so add the MDIO timing delay in
xgmac_mdio_read to make it work stably with RTL8211F on T1023RDB.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Change-Id: Ib85b1858d1cca310992b892dd1c86a129c36e7d2
Reviewed-on: http://git.am.freescale.net:8181/33272
Tested-by: Honghua Yin <Hong-Hua.Yin@freescale.com>
Reviewed-by: Honghua Yin <Hong-Hua.Yin@freescale.com>

diff --git a/drivers/net/ethernet/freescale/xgmac_mdio.c b/drivers/net/ethernet/freescale/xgmac_mdio.c
index 2263477..dca1325 100644
--- a/drivers/net/ethernet/freescale/xgmac_mdio.c
+++ b/drivers/net/ethernet/freescale/xgmac_mdio.c
@@ -19,6 +19,9 @@
 #include <linux/mdio.h>
 #include <linux/of_platform.h>
 #include <linux/of_mdio.h>
+#ifdef CONFIG_FMAN_V3L
+#include <asm/mpc85xx.h>
+#endif
 
 /* Number of microseconds to wait for a register to respond */
 #define TIMEOUT	1000
@@ -180,6 +183,12 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 			return ret;
 	}
 
+#ifdef CONFIG_FMAN_V3L
+	/* Fixup for RTL8211F MDIO timing delay on T1023RDB */
+	if (SVR_SOC_VER(mfspr(SPRN_SVR)) == SVR_T1023)
+		udelay(50);
+#endif
+
 	/* Initiate the read */
 	out_be32(&regs->mdio_ctl, mdio_ctl | MDIO_CTL_READ);
 
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