tg3: Do not enable APE on bcm5700

With older versions of the NVRAM format, the driver may mistakenly
determine that APE is enabled.  Make sure this doesn't happen by
restricting the ENABLE_APE check to devices known to have more
recent NVRAM image formats.

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>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 45fcbc3..978d1f0 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -11441,8 +11441,11 @@
 			if (tp->tg3_flags2 & TG3_FLG2_5750_PLUS)
 				tp->tg3_flags2 |= TG3_FLG2_ASF_NEW_HANDSHAKE;
 		}
-		if (nic_cfg & NIC_SRAM_DATA_CFG_APE_ENABLE)
+
+		if ((nic_cfg & NIC_SRAM_DATA_CFG_APE_ENABLE) &&
+			(tp->tg3_flags2 & TG3_FLG2_5750_PLUS))
 			tp->tg3_flags3 |= TG3_FLG3_ENABLE_APE;
+
 		if (tp->tg3_flags2 & TG3_FLG2_ANY_SERDES &&
 		    !(nic_cfg & NIC_SRAM_DATA_CFG_FIBER_WOL))
 			tp->tg3_flags &= ~TG3_FLAG_WOL_CAP;