ahci: Enable SB600 64bit DMA on MSI K9A2 Platinum v2

Like the Asus M2A-VM, MSI's K9A2 Platinum (MS-7376) can also support 64bit
DMA. It is a new enough board that all the BIOS releases work correctly with
64bit DMA enabled.

Signed-off-by: Mark Nelson <mdnelson8@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 35 insertions, 5 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index a06f5d6375a8..a3241a1a710b 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2718,6 +2718,30 @@ static bool ahci_sb600_enable_64bit(struct pci_dev *pdev)
                         },
                         .driver_data = "20071026",      /* yyyymmdd */
                 },
+                /*
+                 * All BIOS versions for the MSI K9A2 Platinum (MS-7376)
+                 * support 64bit DMA.
+                 *
+                 * BIOS versions earlier than 1.5 had the Manufacturer DMI
+                 * fields as "MICRO-STAR INTERANTIONAL CO.,LTD".
+                 * This spelling mistake was fixed in BIOS version 1.5, so
+                 * 1.5 and later have the Manufacturer as
+                 * "MICRO-STAR INTERNATIONAL CO.,LTD".
+                 * So try to match on DMI_BOARD_VENDOR of "MICRO-STAR INTER".
+                 *
+                 * BIOS versions earlier than 1.9 had a Board Product Name
+                 * DMI field of "MS-7376". This was changed to be
+                 * "K9A2 Platinum (MS-7376)" in version 1.9, but we can still
+                 * match on DMI_BOARD_NAME of "MS-7376".
+                 */
+                {
+                        .ident = "MSI K9A2 Platinum",
+                        .matches = {
+                                DMI_MATCH(DMI_BOARD_VENDOR,
+                                          "MICRO-STAR INTER"),
+                                DMI_MATCH(DMI_BOARD_NAME, "MS-7376"),
+                        },
+                },
                 { }
         };
         const struct dmi_system_id *match;
@@ -2729,18 +2753,24 @@ static bool ahci_sb600_enable_64bit(struct pci_dev *pdev)
             !match)
                 return false;
 
+        if (!match->driver_data)
+                goto enable_64bit;
+
         dmi_get_date(DMI_BIOS_DATE, &year, &month, &date);
         snprintf(buf, sizeof(buf), "%04d%02d%02d", year, month, date);
 
-        if (strcmp(buf, match->driver_data) >= 0) {
-                dev_printk(KERN_WARNING, &pdev->dev, "%s: enabling 64bit DMA\n",
-                           match->ident);
-                return true;
-        } else {
+        if (strcmp(buf, match->driver_data) >= 0)
+                goto enable_64bit;
+        else {
                 dev_printk(KERN_WARNING, &pdev->dev, "%s: BIOS too old, "
                            "forcing 32bit DMA, update BIOS\n", match->ident);
                 return false;
         }
+
+enable_64bit:
+        dev_printk(KERN_WARNING, &pdev->dev, "%s: enabling 64bit DMA\n",
+                   match->ident);
+        return true;
 }
 
 static bool ahci_broken_system_poweroff(struct pci_dev *pdev)