drive->init_speed = 0;
if (id && (id->capability & 1) && drive->autodma) {
-
- if (ide_use_dma(drive)) {
- if (config_chipset_for_dma(drive))
- return hwif->ide_dma_on(drive);
+ /* Consult the list of known "bad" drives */
+ if (__ide_dma_bad_drive(drive))
+ goto fast_ata_pio;
+ if (id->field_valid & 4) {
+ if (id->dma_ultra & hwif->ultra_mask) {
+ /* Force if Capable UltraDMA */
+ int dma = config_chipset_for_dma(drive);
+ if ((id->field_valid & 2) && !dma)
+ goto try_dma_modes;
+ }
+ } else if (id->field_valid & 2) {
+try_dma_modes:
+ if ((id->dma_mword & hwif->mwdma_mask) ||
+ (id->dma_1word & hwif->swdma_mask)) {
+ /* Force if Capable regular DMA modes */
+ if (!config_chipset_for_dma(drive))
+ goto no_dma_set;
+ }
+ } else if (__ide_dma_good_drive(drive) &&
+ (id->eide_dma_time < 150)) {
+ /* Consult the list of known "good" drives */
+ if (!config_chipset_for_dma(drive))
+ goto no_dma_set;
+ } else {
+ goto fast_ata_pio;
}
-
- goto fast_ata_pio;
-
+ return hwif->ide_dma_on(drive);
} else if ((id->capability & 8) || (id->field_valid & 2)) {
fast_ata_pio:
+no_dma_set:
sis5513_tune_drive(drive, 5);
return hwif->ide_dma_off_quietly(drive);
}