diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index ad81ec6..1a315d0 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -240,10 +240,12 @@
 #define NVREG_RNDSEED_FORCE2	0x2d00
 #define NVREG_RNDSEED_FORCE3	0x7400
 
-	NvRegUnknownSetupReg1 = 0xA0,
-#define NVREG_UNKSETUP1_VAL	0x16070f
-	NvRegUnknownSetupReg2 = 0xA4,
-#define NVREG_UNKSETUP2_VAL	0x16
+	NvRegTxDeferral = 0xA0,
+#define NVREG_TX_DEFERRAL_DEFAULT	0x15050f
+#define NVREG_TX_DEFERRAL_RGMII_10_100	0x16070f
+#define NVREG_TX_DEFERRAL_RGMII_1000	0x14050f
+	NvRegRxDeferral = 0xA4,
+#define NVREG_RX_DEFERRAL_DEFAULT	0x16
 	NvRegMacAddrA = 0xA8,
 	NvRegMacAddrB = 0xAC,
 	NvRegMulticastAddrA = 0xB0,
@@ -2127,7 +2129,7 @@
 	int newdup = np->duplex;
 	int mii_status;
 	int retval = 0;
-	u32 control_1000, status_1000, phyreg, pause_flags;
+	u32 control_1000, status_1000, phyreg, pause_flags, txreg;
 
 	/* BMSR_LSTATUS is latched, read it twice:
 	 * we want the current value.
@@ -2245,6 +2247,16 @@
 		phyreg |= PHY_1000;
 	writel(phyreg, base + NvRegPhyInterface);
 
+	if (phyreg & PHY_RGMII) {
+		if ((np->linkspeed & NVREG_LINKSPEED_MASK) == NVREG_LINKSPEED_1000)
+			txreg = NVREG_TX_DEFERRAL_RGMII_1000;
+		else
+			txreg = NVREG_TX_DEFERRAL_RGMII_10_100;
+	} else {
+		txreg = NVREG_TX_DEFERRAL_DEFAULT;
+	}
+	writel(txreg, base + NvRegTxDeferral);
+
 	writel(NVREG_MISC1_FORCE | ( np->duplex ? 0 : NVREG_MISC1_HD),
 		base + NvRegMisc1);
 	pci_push(base);
@@ -3932,8 +3944,8 @@
 	writel(readl(base + NvRegReceiverStatus), base + NvRegReceiverStatus);
 	get_random_bytes(&i, sizeof(i));
 	writel(NVREG_RNDSEED_FORCE | (i&NVREG_RNDSEED_MASK), base + NvRegRandomSeed);
-	writel(NVREG_UNKSETUP1_VAL, base + NvRegUnknownSetupReg1);
-	writel(NVREG_UNKSETUP2_VAL, base + NvRegUnknownSetupReg2);
+	writel(NVREG_TX_DEFERRAL_DEFAULT, base + NvRegTxDeferral);
+	writel(NVREG_RX_DEFERRAL_DEFAULT, base + NvRegRxDeferral);
 	if (poll_interval == -1) {
 		if (optimization_mode == NV_OPTIMIZATION_MODE_THROUGHPUT)
 			writel(NVREG_POLL_DEFAULT_THROUGHPUT, base + NvRegPollingInterval);