diff options
Diffstat (limited to 'drivers/ide/ide-dma.c')
| -rw-r--r-- | drivers/ide/ide-dma.c | 48 |
1 files changed, 32 insertions, 16 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c index ff644a5e12cd..6000c08f51ba 100644 --- a/drivers/ide/ide-dma.c +++ b/drivers/ide/ide-dma.c @@ -653,7 +653,7 @@ static const u8 xfer_mode_bases[] = { XFER_SW_DMA_0, }; -static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base) +static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode) { struct hd_driveid *id = drive->id; ide_hwif_t *hwif = drive->hwif; @@ -664,17 +664,28 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base) if ((id->field_valid & 4) == 0) break; - mask = id->dma_ultra & hwif->ultra_mask; - if (hwif->udma_filter) - mask &= hwif->udma_filter(drive); + mask = hwif->udma_filter(drive); + else + mask = hwif->ultra_mask; + mask &= id->dma_ultra; - if ((mask & 0x78) && (eighty_ninty_three(drive) == 0)) - mask &= 0x07; + /* + * avoid false cable warning from eighty_ninty_three() + */ + if (req_mode > XFER_UDMA_2) { + if ((mask & 0x78) && (eighty_ninty_three(drive) == 0)) + mask &= 0x07; + } break; case XFER_MW_DMA_0: - if (id->field_valid & 2) - mask = id->dma_mword & hwif->mwdma_mask; + if ((id->field_valid & 2) == 0) + break; + if (hwif->mdma_filter) + mask = hwif->mdma_filter(drive); + else + mask = hwif->mwdma_mask; + mask &= id->dma_mword; break; case XFER_SW_DMA_0: if (id->field_valid & 2) { @@ -703,15 +714,18 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base) } /** - * ide_max_dma_mode - compute DMA speed + * ide_find_dma_mode - compute DMA speed * @drive: IDE device + * @req_mode: requested mode + * + * Checks the drive/host capabilities and finds the speed to use for + * the DMA transfer. The speed is then limited by the requested mode. * - * Checks the drive capabilities and returns the speed to use - * for the DMA transfer. Returns 0 if the drive is incapable - * of DMA transfers. + * Returns 0 if the drive/host combination is incapable of DMA transfers + * or if the requested mode is not a DMA mode. */ -u8 ide_max_dma_mode(ide_drive_t *drive) +u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode) { ide_hwif_t *hwif = drive->hwif; unsigned int mask; @@ -722,7 +736,9 @@ u8 ide_max_dma_mode(ide_drive_t *drive) return 0; for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) { - mask = ide_get_mode_mask(drive, xfer_mode_bases[i]); + if (req_mode < xfer_mode_bases[i]) + continue; + mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode); x = fls(mask) - 1; if (x >= 0) { mode = xfer_mode_bases[i] + x; @@ -732,10 +748,10 @@ u8 ide_max_dma_mode(ide_drive_t *drive) printk(KERN_DEBUG "%s: selected mode 0x%x\n", drive->name, mode); - return mode; + return min(mode, req_mode); } -EXPORT_SYMBOL_GPL(ide_max_dma_mode); +EXPORT_SYMBOL_GPL(ide_find_dma_mode); int ide_tune_dma(ide_drive_t *drive) { |