[TG3]: Limit 5784 / 5764 to MAC LED mode

Most 5784 / 5764 LED modes do not work as expected because of a hardware
bug.  This patch forces the LED mode to be in MAC LED mode.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -10610,6 +10610,9 @@ static void __devinit tg3_get_eeprom_hw_cfg(struct tg3 *tp)
 		    tp->pdev->subsystem_vendor == PCI_VENDOR_ID_DELL)
 			tp->led_ctrl = LED_CTRL_MODE_PHY_2;
 
+		if (tp->pci_chip_rev_id == CHIPREV_ID_5784_A0)
+			tp->led_ctrl = LED_CTRL_MODE_MAC;
+
 		if (nic_cfg & NIC_SRAM_DATA_CFG_EEPROM_WP) {
 			tp->tg3_flags |= TG3_FLAG_EEPROM_WRITE_PROT;
 			if ((tp->pdev->subsystem_vendor ==