From 23a8c64a6f4e129c62929fd2070f6066b8cf70ce Mon Sep 17 00:00:00 2001
From: Tejun Heo <htejun@gmail.com>
Date: Sun, 16 Aug 2009 21:04:02 +0900
Subject: [PATCH] --- yaml --- r: 158515 b: refs/heads/master c:
 03d783bf5573ff316a8c703eed811a9a97901a8b h: refs/heads/master i:   158513:
 a90f0b065cb258e1402f1cf5d5fa2d146737bc4d   158511:
 093d66ac5d0fc8d22d3abfa23dbe235bb5ed9517 v: v3

---
 [refs]                   |  2 +-
 trunk/drivers/ata/ahci.c | 53 ++++++++++++++++++++++------------------
 2 files changed, 30 insertions(+), 25 deletions(-)

diff --git a/[refs] b/[refs]
index 09e6a116e311..6a4003c698fc 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3e5cd1f2576c720f1d0705fdd7ba64f27e8836b7
+refs/heads/master: 03d783bf5573ff316a8c703eed811a9a97901a8b
diff --git a/trunk/drivers/ata/ahci.c b/trunk/drivers/ata/ahci.c
index 147b9be3b4d2..aa03b49a9af2 100644
--- a/trunk/drivers/ata/ahci.c
+++ b/trunk/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))