via82cxxx: backport short cables support from pata_via.c

Backport short cables support from pata_via.c.

This patch should allow UDMA > 2 modes on Acer Ferrari 3400.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>

1 files changed, 41 insertions, 7 deletions

diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index ae88e9f65921..d21dd2e7eeb3 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -1,6 +1,6 @@
 /*
  *
- * Version 3.40
+ * Version 3.45
  *
  * VIA IDE driver for Linux. Supported southbridges:
  *
@@ -34,6 +34,8 @@
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/ide.h>
+#include <linux/dmi.h>
+
 #include <asm/io.h>
 
 #ifdef CONFIG_PPC_CHRP
@@ -415,6 +417,42 @@ static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const
         return 0;
 }
 
+/*
+ *      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(void)
+{
+        /* Systems by DMI */
+        if (dmi_check_system(cable_dmi_table))
+                return 1;
+        return 0;
+}
+
+static u8 __devinit via82cxxx_cable_detect(ide_hwif_t *hwif)
+{
+        struct via82cxxx_dev *vdev = pci_get_drvdata(hwif->pci_dev);
+
+        if (via_cable_override())
+                return ATA_CBL_PATA40_SHORT;
+
+        if ((vdev->via_80w >> hwif->channel) & 1)
+                return ATA_CBL_PATA80;
+        else
+                return ATA_CBL_PATA40;
+}
+
 static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
 {
         struct via82cxxx_dev *vdev = pci_get_drvdata(hwif->pci_dev);
@@ -448,12 +486,8 @@ static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
         hwif->mwdma_mask = 0x07;
         hwif->swdma_mask = 0x07;
 
-        if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
-                if ((vdev->via_80w >> hwif->channel) & 1)
-                        hwif->cbl = ATA_CBL_PATA80;
-                else
-                        hwif->cbl = ATA_CBL_PATA40;
-        }
+        if (hwif->cbl != ATA_CBL_PATA40_SHORT)
+                hwif->cbl = via82cxxx_cable_detect(hwif);
 
         hwif->ide_dma_check = &via82cxxx_ide_dma_check;
         if (!noautodma)