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>

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index a06f5d6375a88edd4324881f43131fbd38b7bec3..a3241a1a710bc26342a731f98e56af67e6d8b5f8 100644 (file)
--- 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)