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ide-iops: only clear DMA words on setting DMA mode
The bytes indicating current DMA mode in the identify data words 62, 63, and 88 should only change on setting a DMA mode, so stop clearing them on setting PIO mode in ide_config_drive_speed(). While at it, correct SW/MW DMA mode masks... Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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1 changed files with 5 additions and 3 deletions
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@ -386,9 +386,11 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
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return error;
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}
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if (speed >= XFER_SW_DMA_0) {
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id[ATA_ID_UDMA_MODES] &= ~0xFF00;
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id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
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id[ATA_ID_SWDMA_MODES] &= ~0x0F00;
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id[ATA_ID_MWDMA_MODES] &= ~0x0700;
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id[ATA_ID_SWDMA_MODES] &= ~0x0700;
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}
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skip:
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#ifdef CONFIG_BLK_DEV_IDEDMA
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