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>
diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index 49bd1c6..ae88e9f 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -448,8 +448,13 @@
hwif->mwdma_mask = 0x07;
hwif->swdma_mask = 0x07;
- if (!hwif->udma_four)
- hwif->udma_four = (vdev->via_80w >> hwif->channel) & 1;
+ 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;
+ }
+
hwif->ide_dma_check = &via82cxxx_ide_dma_check;
if (!noautodma)
hwif->autodma = 1;