diff options
| author | Sergei Shtylyov <sshtylyov@ru.mvista.com> | 2006-12-29 16:49:18 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-30 10:56:43 -0800 |
| commit | 242ce41fc92214c3430495edd43783c3ba3dcd2b (patch) | |
| tree | e550962d9ee6706ebdf8c49f1165428b0e63ecdc /drivers/ide/pci/piix.c | |
| parent | 755cd90029b61b96816b8ac0ab6a33a197f842d0 (diff) | |
[PATCH] PIIX: remove check for broken MW DMA mode 0
There's no need to check in piix_config_drive_for_dma() for broken MW DMA
mode 0 as this mode is not supported by the driver (it sets
hwif->mwdma_mask to 0x6), and hence can't be selected by ide_dma_speed().
(Alan sayeth "Probably right but if not you've got a subtle corruptor. Should
at least stick a BUG_ON mode 0 setting right close when the mode is set.")
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/ide/pci/piix.c')
| -rw-r--r-- | drivers/ide/pci/piix.c | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c index b1e9a8eba6b..8ecd2d668db 100644 --- a/drivers/ide/pci/piix.c +++ b/drivers/ide/pci/piix.c @@ -353,33 +353,6 @@ static int piix_tune_chipset (ide_drive_t *drive, u8 xferspeed) } /** - * piix_faulty_dma0 - check for DMA0 errata - * @hwif: IDE interface to check - * - * If an ICH/ICH0/ICH2 interface is is operating in multi-word - * DMA mode with 600nS cycle time the IDE PIO prefetch buffer will - * inadvertently provide an extra piece of secondary data to the primary - * device resulting in data corruption. - * - * With such a device this test function returns true. This allows - * our tuning code to follow Intel recommendations and use PIO on - * such devices. - */ - -static int piix_faulty_dma0(ide_hwif_t *hwif) -{ - switch(hwif->pci_dev->device) - { - case PCI_DEVICE_ID_INTEL_82801AA_1: /* ICH */ - case PCI_DEVICE_ID_INTEL_82801AB_1: /* ICH0 */ - case PCI_DEVICE_ID_INTEL_82801BA_8: /* ICH2 */ - case PCI_DEVICE_ID_INTEL_82801BA_9: /* ICH2 */ - return 1; - } - return 0; -} - -/** * piix_config_drive_for_dma - configure drive for DMA * @drive: IDE drive to configure * @@ -391,10 +364,6 @@ static int piix_faulty_dma0(ide_hwif_t *hwif) static int piix_config_drive_for_dma (ide_drive_t *drive) { u8 speed = ide_dma_speed(drive, piix_ratemask(drive)); - - /* Some ICH devices cannot support DMA mode 0 */ - if(speed == XFER_MW_DMA_0 && piix_faulty_dma0(HWIF(drive))) - speed = 0; /* If no DMA speed was available or the chipset has DMA bugs then disable DMA and use PIO */ |