From 49521f97ccd3c2bf6e71a91cea8fe65d170fa4fb Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Mon, 9 Jul 2007 23:17:58 +0200 Subject: 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 Reviewed-by: Sergei Shtylyov --- drivers/ide/pci/pdc202xx_new.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'drivers/ide/pci/pdc202xx_new.c') diff --git a/drivers/ide/pci/pdc202xx_new.c b/drivers/ide/pci/pdc202xx_new.c index 0765dce6948..ee5020df005 100644 --- a/drivers/ide/pci/pdc202xx_new.c +++ b/drivers/ide/pci/pdc202xx_new.c @@ -225,7 +225,10 @@ static void pdcnew_tune_drive(ide_drive_t *drive, u8 pio) static u8 pdcnew_cable_detect(ide_hwif_t *hwif) { - return get_indexed_reg(hwif, 0x0b) & 0x04; + if (get_indexed_reg(hwif, 0x0b) & 0x04) + return ATA_CBL_PATA40; + else + return ATA_CBL_PATA80; } static int pdcnew_config_drive_xfer_rate(ide_drive_t *drive) @@ -509,8 +512,8 @@ static void __devinit init_hwif_pdc202new(ide_hwif_t *hwif) hwif->ide_dma_check = &pdcnew_config_drive_xfer_rate; - if (!hwif->udma_four) - hwif->udma_four = pdcnew_cable_detect(hwif) ? 0 : 1; + if (hwif->cbl != ATA_CBL_PATA40_SHORT) + hwif->cbl = pdcnew_cable_detect(hwif); if (!noautodma) hwif->autodma = 1; -- cgit v1.2.3-70-g09d2