ahci: make ahci_asus_m2a_vm_32bit_only() quirk more generic

It turns out ASUS M2A-VM isn't the only one with the 32bit DMA
problem.  Make ahci_asus_m2a_vm_32bit_only() more generic using the
new dmi_get_date() and rename it to ahci_sb600_32bit_only().  Cut off
date is now pointed to by dmi_system_id->driver_data in "yyyymmdd"
format and it's now also allowed to be omitted.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Sandor Bodo-Merle <sbodomerle@gmail.com>
Cc: Shane Huang <shane.huang@amd.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 29 insertions, 24 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 147b9be3b4d2..aa03b49a9af2 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2647,14 +2647,18 @@ static void ahci_p5wdh_workaround(struct ata_host *host)
 }
 
 /*
- * SB600 ahci controller on ASUS M2A-VM can't do 64bit DMA with older
- * BIOS.  The oldest version known to be broken is 0901 and working is
- * 1501 which was released on 2007-10-26.  Force 32bit DMA on anything
- * older than 1501.  Please read bko#9412 for more info.
+ * SB600 ahci controller on certain boards can't do 64bit DMA with
+ * older BIOS.
  */
-static bool ahci_asus_m2a_vm_32bit_only(struct pci_dev *pdev)
+static bool ahci_sb600_32bit_only(struct pci_dev *pdev)
 {
         static const struct dmi_system_id sysids[] = {
+                /*
+                 * The oldest version known to be broken is 0901 and
+                 * working is 1501 which was released on 2007-10-26.
+                 * Force 32bit DMA on anything older than 1501.
+                 * Please read bko#9412 for more info.
+                 */
                 {
                         .ident = "ASUS M2A-VM",
                         .matches = {
@@ -2662,31 +2666,32 @@ static bool ahci_asus_m2a_vm_32bit_only(struct pci_dev *pdev)
                                           "ASUSTeK Computer INC."),
                                 DMI_MATCH(DMI_BOARD_NAME, "M2A-VM"),
                         },
+                        .driver_data = "20071026",      /* yyyymmdd */
                 },
                 { }
         };
-        const char *cutoff_mmdd = "10/26";
-        const char *date;
-        int year;
+        const struct dmi_system_id *match;
 
+        match = dmi_first_match(sysids);
         if (pdev->bus->number != 0 || pdev->devfn != PCI_DEVFN(0x12, 0) ||
-            !dmi_check_system(sysids))
+            !match)
                 return false;
 
-        /*
-         * Argh.... both version and date are free form strings.
-         * Let's hope they're using the same date format across
-         * different versions.
-         */
-        date = dmi_get_system_info(DMI_BIOS_DATE);
-        dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);
-        if (date && strlen(date) >= 10 && date[2] == '/' && date[5] == '/' &&
-            (year > 2007 ||
-             (year == 2007 && strncmp(date, cutoff_mmdd, 5) >= 0)))
-                return false;
+        if (match->driver_data) {
+                int year, month, date;
+                char buf[9];
+
+                dmi_get_date(DMI_BIOS_DATE, &year, &month, &date);
+                snprintf(buf, sizeof(buf), "%04d%02d%02d", year, month, date);
 
-        dev_printk(KERN_WARNING, &pdev->dev, "ASUS M2A-VM: BIOS too old, "
-                   "forcing 32bit DMA, update BIOS\n");
+                if (strcmp(buf, match->driver_data) >= 0)
+                        return false;
+
+                dev_printk(KERN_WARNING, &pdev->dev, "%s: BIOS too old, "
+                           "forcing 32bit DMA, update BIOS\n", match->ident);
+        } else
+                dev_printk(KERN_WARNING, &pdev->dev, "%s: this board can't "
+                           "do 64bit DMA, forcing 32bit\n", match->ident);
 
         return true;
 }
@@ -2901,8 +2906,8 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         if (board_id == board_ahci_sb700 && pdev->revision >= 0x40)
                 hpriv->flags &= ~AHCI_HFLAG_IGN_SERR_INTERNAL;
 
-        /* apply ASUS M2A_VM quirk */
-        if (ahci_asus_m2a_vm_32bit_only(pdev))
+        /* apply sb600 32bit only quirk */
+        if (ahci_sb600_32bit_only(pdev))
                 hpriv->flags |= AHCI_HFLAG_32BIT_ONLY;
 
         if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))