[PATCH v2] ata: Fix DVD not dectected at some Haswell platforms

[Youquan Song <youquan.song@intel.com>]

There is a quirk patch 5e5a4f5d5a08c9c504fe956391ac3dae2c66556d 
"ata_piix: make DVD Drive recognisable on systems with Intel Sandybridge
 chipsets(v2)

    This quirk patch fixes one kind of bug inside some Intel Sandybridge
    chipsets, see reports from

           https://bugzilla.kernel.org/show_bug.cgi?id=40592.

    Many guys also have reported the problem before:

        https://bugs.launchpad.net/bugs/737388
        https://bugs.launchpad.net/bugs/794642
        https://bugs.launchpad.net/bugs/782389
        ......

    With help from Tejun, the problem is found to be caused by 32bit PIO
    mode, so introduce the quirk patch to disable 32bit PIO on SATA piix
    for some Sandybridge CPT chipsets.

    Seth also tested the patch on all five affected chipsets
    (pci device ID: 0x1c00, 0x1c01, 0x1d00, 0x1e00, 0x1e01), and found
    the patch does fix the problem.
"

The above patch only fixing the 4 ports IDE controller 32bit PIO mode. 

Recently, the problem was shown at Haswell Desktop platform which includes 2 
ports IDE controller.

So introduce a quirk patch to disable 32bit PIO on this IDE controller. 

v2: Change spelling error in statememnt pointed by Sergei Shtylyov.

Tested-by: Lee, Chun-Yi <jlee@suse.com>
Signed-off-by: Youquan Song <youquan.song@intel.com>
Cc: stable@vger.kernel.org
---
 drivers/ata/ata_piix.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index ef773e1..1993e52 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -150,6 +150,7 @@ enum piix_controller_ids {
 	tolapai_sata,
 	piix_pata_vmw,			/* PIIX4 for VMware, spurious DMA_ERR */
 	ich8_sata_snb,
+	ich8_2port_sata_snb,
 };
 
 struct piix_map_db {
@@ -326,7 +327,7 @@ static const struct pci_device_id piix_pci_tbl[] = {
 	/* SATA Controller IDE (Lynx Point) */
 	{ 0x8086, 0x8c01, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
 	/* SATA Controller IDE (Lynx Point) */
-	{ 0x8086, 0x8c08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
+	{ 0x8086, 0x8c08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_snb },
 	/* SATA Controller IDE (Lynx Point) */
 	{ 0x8086, 0x8c09, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
 	/* SATA Controller IDE (Lynx Point-LP) */
@@ -502,6 +503,7 @@ static const struct piix_map_db *piix_map_db_table[] = {
 	[ich8m_apple_sata]	= &ich8m_apple_map_db,
 	[tolapai_sata]		= &tolapai_map_db,
 	[ich8_sata_snb]		= &ich8_map_db,
+	[ich8_2port_sata_snb]	= &ich8_2port_map_db,
 };
 
 static struct ata_port_info piix_port_info[] = {
@@ -643,6 +645,16 @@ static struct ata_port_info piix_port_info[] = {
 		.port_ops	= &piix_sata_ops,
 	},
 
+	[ich8_2port_sata_snb] =
+	{
+		.flags		= PIIX_SATA_FLAGS | PIIX_FLAG_SIDPR | PIIX_FLAG_PIO16,
+		.pio_mask	= ATA_PIO4,
+		.mwdma_mask	= ATA_MWDMA2,
+		.udma_mask	= ATA_UDMA6,
+		.port_ops	= &piix_sata_ops,
+	},
+
+
 };
 
 static struct pci_bits piix_enable_bits[] = {
-- 
1.6.4.2