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ide: add short cables support

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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>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2007-07-09 23:17:58 +02:00
parent 75b1d97535
commit 49521f97cc
25 changed files with 124 additions and 90 deletions
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8
drivers/ide/pci/it8213.c
View File

@@ -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