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, 4 insertions, 4 deletions

diff --git a/drivers/ide/pci/it8213.c b/drivers/ide/pci/it8213.c
index c04a02687b95..ff48c23e571e 100644
--- a/drivers/ide/pci/it8213.c
+++ b/drivers/ide/pci/it8213.c
@@ -231,7 +231,7 @@ static int it8213_config_drive_for_dma (ide_drive_t *drive)
 
 static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
 {
-        u8 reg42h = 0, ata66 = 0;
+        u8 reg42h = 0;
 
         hwif->speedproc = &it8213_tune_chipset;
         hwif->tuneproc  = &it8213_tuneproc;
@@ -250,11 +250,11 @@ static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
         hwif->swdma_mask = 0x04;
 
         pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
-        ata66 = (reg42h & 0x02) ? 0 : 1;
 
         hwif->ide_dma_check = &it8213_config_drive_for_dma;
-        if (!(hwif->udma_four))
-                hwif->udma_four = ata66;
+
+        if (hwif->cbl != ATA_CBL_PATA40_SHORT)
+                hwif->cbl = (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 
         /*
          *      The BIOS often doesn't set up DMA on this controller