diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 3ed3cf2f5568..ec3ce120a517 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4241,6 +4241,10 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
 	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
 	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
 
+	/* Devices which get the IVB wrong */
+	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
+	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
+
 	/* End Marker */
 	{ }
 };
@@ -4301,6 +4305,21 @@ static int ata_dma_blacklisted(const struct ata_device *dev)
 	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
 }
 
+/**
+ *	ata_is_40wire		-	check drive side detection
+ *	@dev: device
+ *
+ *	Perform drive side detection decoding, allowing for device vendors
+ *	who can't follow the documentation.
+ */
+
+static int ata_is_40wire(struct ata_device *dev)
+{
+	if (dev->horkage & ATA_HORKAGE_IVB)
+		return ata_drive_40wire_relaxed(dev->id);
+	return ata_drive_40wire(dev->id);
+}
+
 /**
  *	ata_dev_xfermask - Compute supported xfermask of the given device
  *	@dev: Device to compute xfermask for
@@ -4370,7 +4389,7 @@ static void ata_dev_xfermask(struct ata_device *dev)
 	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
 		/* UDMA/44 or higher would be available */
 		if ((ap->cbl == ATA_CBL_PATA40) ||
-		    (ata_drive_40wire(dev->id) &&
+		    (ata_is_40wire(dev) &&
 		    (ap->cbl == ATA_CBL_PATA_UNK ||
 		     ap->cbl == ATA_CBL_PATA80))) {
 			ata_dev_printk(dev, KERN_WARNING,
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 304825b1c977..5c4e54a2a8d6 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -537,6 +537,15 @@ static inline int ata_drive_40wire(const u16 *dev_id)
 	return 1;
 }
 
+static inline int ata_drive_40wire_relaxed(const u16 *dev_id)
+{
+	if (ata_id_is_sata(dev_id))
+		return 0;	/* SATA */
+	if ((dev_id[93] & 0x2000) == 0x2000)
+		return 0;	/* 80 wire */
+	return 1;
+}
+
 static inline int atapi_cdb_len(const u16 *dev_id)
 {
 	u16 tmp = dev_id[0] & 0x3;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 1e277852ba42..56a5673aebad 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -339,6 +339,7 @@ enum {
 	ATA_HORKAGE_SKIP_PM	= (1 << 5),	/* Skip PM operations */
 	ATA_HORKAGE_HPA_SIZE	= (1 << 6),	/* native size off by one */
 	ATA_HORKAGE_IPM		= (1 << 7),	/* Link PM problems */
+	ATA_HORKAGE_IVB		= (1 << 8),	/* cbl det validity bit bugs */
 
 	 /* DMA mask for user DMA control: User visible values; DO NOT
 	    renumber */