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, 2 insertions, 2 deletions

diff --git a/drivers/ide/pci/tc86c001.c b/drivers/ide/pci/tc86c001.c
index cee619bb2eaf..8de1f8e22494 100644
--- a/drivers/ide/pci/tc86c001.c
+++ b/drivers/ide/pci/tc86c001.c
@@ -220,13 +220,13 @@ static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
         hwif->ide_dma_check     = &tc86c001_config_drive_xfer_rate;
         hwif->dma_start         = &tc86c001_dma_start;
 
-        if (!hwif->udma_four) {
+        if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
                 /*
                  * System Control  1 Register bit 13 (PDIAGN):
                  * 0=80-pin cable, 1=40-pin cable
                  */
                 scr1 = hwif->INW(sc_base + 0x00);
-                hwif->udma_four = (scr1 & 0x2000) ? 0 : 1;
+                hwif->cbl = (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
         }
 
         if (!noautodma)