[BNX2]: Disable parallel detect on an HP blade.

Because of some board issues, we need to disable parallel detect on
an HP blade. Without this patch, the link state can become stuck
when it goes into parallel detect mode.

Signed-off-by: Michael Chan <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/bnx2.c

···
 	return -ENODEV;
 }
 
+/* Determining link for parallel detection. */
 static int
 bnx2_5706_serdes_has_link(struct bnx2 *bp)
 {
 	u32 mode_ctl, an_dbg, exp;
+
+	if (bp->phy_flags & BNX2_PHY_FLAG_NO_PARALLEL)
+		return 0;
 
 	bnx2_write_phy(bp, MII_BNX2_MISC_SHADOW, MISC_SHDW_MODE_CTL);
 	bnx2_read_phy(bp, MII_BNX2_MISC_SHADOW, &mode_ctl);
···
 			bp->flags |= BNX2_FLAG_NO_WOL;
 			bp->wol = 0;
 		}
-		if (CHIP_NUM(bp) != CHIP_NUM_5706) {
+		if (CHIP_NUM(bp) == CHIP_NUM_5706) {
+			/* Don't do parallel detect on this board because of
+			 * some board problems.  The link will not go down
+			 * if we do parallel detect.
+			 */
+			if (pdev->subsystem_vendor == PCI_VENDOR_ID_HP &&
+			    pdev->subsystem_device == 0x310c)
+				bp->phy_flags |= BNX2_PHY_FLAG_NO_PARALLEL;
+		} else {
 			bp->phy_addr = 2;
 			if (reg & BNX2_SHARED_HW_CFG_PHY_2_5G)
 				bp->phy_flags |= BNX2_PHY_FLAG_2_5G_CAPABLE;

drivers/net/bnx2.h

···
 #define BNX2_PHY_FLAG_DIS_EARLY_DAC		0x00000400
 #define BNX2_PHY_FLAG_REMOTE_PHY_CAP		0x00000800
 #define BNX2_PHY_FLAG_FORCED_DOWN		0x00001000
+#define BNX2_PHY_FLAG_NO_PARALLEL		0x00002000
 
 	u32			mii_bmcr;
 	u32			mii_bmsr;