pata_via: Handle laptops via DMI

Oh the joy of saving a fraction of a cent using short 40 wire cables and
not faking 80wire

Teach the VIA driver that there are some systems we need to know are
magically wired for high speeds.

Signed-off-by: Alan Cox <alan@redhat.com>
Tested-by: Francis Russell <FrancisRussell@btinternet.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index e4c71f76bd5..708dfc0c716 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -60,6 +60,7 @@
 #include <linux/delay.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>
+#include <linux/dmi.h>
 
 #define DRV_NAME "pata_via"
 #define DRV_VERSION "0.3.1"
@@ -122,6 +123,31 @@ static const struct via_isa_bridge {
         { NULL }
 };
 
+
+/*
+ *      Cable special cases
+ */
+
+static struct dmi_system_id cable_dmi_table[] = {
+        {
+                .ident = "Acer Ferrari 3400",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
+                        DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
+                },
+        },
+        { }
+};
+
+static int via_cable_override(struct pci_dev *pdev)
+{
+        /* Systems by DMI */
+        if (dmi_check_system(cable_dmi_table))
+                return 1;
+        return 0;
+}
+
+
 /**
  *      via_cable_detect        -       cable detection
  *      @ap: ATA port
@@ -139,6 +165,9 @@ static int via_cable_detect(struct ata_port *ap) {
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
         u32 ata66;
 
+        if (via_cable_override(pdev))
+                return ATA_CBL_PATA40_SHORT;
+
         /* Early chips are 40 wire */
         if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
                 return ATA_CBL_PATA40;