tg3: Restrict ASPM workaround devlist

The ASPM workaround setting obtained from NVRAM only works with devices
older than 5717.  This patch enforces the restriction.
Reviewed-by: Benjamin Li <benli@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -12188,7 +12188,9 @@ static void __devinit tg3_get_eeprom_hw_cfg(struct tg3 *tp)
 		    (cfg2 & NIC_SRAM_DATA_CFG_2_APD_EN))
 			tp->tg3_flags3 |= TG3_FLG3_PHY_ENABLE_APD;
 
-		if (tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS) {
+		if ((tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS) &&
+		    GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5785 &&
+		    !(tp->tg3_flags3 & TG3_FLG3_5717_PLUS)) {
 			u32 cfg3;
 
 			tg3_read_mem(tp, NIC_SRAM_DATA_CFG_3, &cfg3);