ide: add short cables support

This patch allows users to override both host and device side cable detection
with "ideX=ata66" kernel parameter.  Thanks to this it should be now possible
to use UDMA > 2 modes on systems (laptops mainly) which use short 40-pin cable
instead of 80-pin one.

Next patches add automatic detection of some systems using short cables.

Changes:

* Rename hwif->udma_four to hwif->cbl and make it u8.

* Convert all existing users accordingly (use ATA_CBL_* defines while at it).  

* Add ATA_CBL_PATA40_SHORT support to ide-iops.c:eighty_ninty_three().

* Use ATA_CBL_PATA40_SHORT for "ideX=ata66" kernel parameter.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/ide/pci/aec62xx.c b/drivers/ide/pci/aec62xx.c
index 794ac40ec90f..e5d09367627e 100644
--- a/drivers/ide/pci/aec62xx.c
+++ b/drivers/ide/pci/aec62xx.c
@@ -234,11 +234,12 @@ static void __devinit init_hwif_aec62xx(ide_hwif_t *hwif)
                 pci_read_config_byte (dev, 0x54, &reg54);
                 pci_write_config_byte(dev, 0x54, (reg54 & ~mask));
                 spin_unlock_irqrestore(&ide_lock, flags);
-        } else if (!hwif->udma_four) {
+        } else if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
                 u8 ata66 = 0, mask = hwif->channel ? 0x02 : 0x01;
 
                 pci_read_config_byte(hwif->pci_dev, 0x49, &ata66);
-                hwif->udma_four = (ata66 & mask) ? 0 : 1;
+
+                hwif->cbl = (ata66 & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
         }
 
         if (!noautodma)