sis5513: backport short cables support from pata_sis.c

Backport short cables support from pata_sis.c.

This patch allows UDMA > 2 modes on ASUS A6K.

Thanks to testing this patch goes out to Jiri Stavinoha.

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

drivers/ide/pci/sis5513.c

@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/sis5513.c	Version 0.20	Mar 4, 2007
+ * linux/drivers/ide/pci/sis5513.c	Version 0.25	Jun 10, 2007
  *
  * Copyright (C) 1999-2000	Andre Hedrick <andre@linux-ide.org>
  * Copyright (C) 2002		Lionel Bouton <Lionel.Bouton@inet6.fr>, Maintainer
@@ -796,10 +796,33 @@ static unsigned int __devinit init_chipset_sis5513 (struct pci_dev *dev, const c
 	return 0;
 }
 
+struct sis_laptop {
+	u16 device;
+	u16 subvendor;
+	u16 subdevice;
+};
+
+static const struct sis_laptop sis_laptop[] = {
+	/* devid, subvendor, subdev */
+	{ 0x5513, 0x1043, 0x1107 },	/* ASUS A6K */
+	/* end marker */
+	{ 0, }
+};
+
 static u8 __devinit ata66_sis5513(ide_hwif_t *hwif)
 {
+	struct pci_dev *pdev = hwif->pci_dev;
+	const struct sis_laptop *lap = &sis_laptop[0];
 	u8 ata66 = 0;
 
+	while (lap->device) {
+		if (lap->device == pdev->device &&
+		    lap->subvendor == pdev->subsystem_vendor &&
+		    lap->subdevice == pdev->subsystem_device)
+			return ATA_CBL_PATA40_SHORT;
+		lap++;
+	}
+
 	if (chipset_family >= ATA_133) {
 		u16 regw = 0;
 		u16 reg_addr = hwif->channel ? 0x52: 0x50;