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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>
This commit is contained in:
Sergei Shtylyov 2009-03-31 20:15:27 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 8d64fcd935
commit c4199930b1
1 changed files with 5 additions and 3 deletions
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8
drivers/ide/ide-iops.c
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@ -386,9 +386,11 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
return error;
}
id[ATA_ID_UDMA_MODES] &= ~0xFF00;
id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
id[ATA_ID_SWDMA_MODES] &= ~0x0F00;
if (speed >= XFER_SW_DMA_0) {
id[ATA_ID_UDMA_MODES] &= ~0xFF00;
id[ATA_ID_MWDMA_MODES] &= ~0x0700;
id[ATA_ID_SWDMA_MODES] &= ~0x0700;
}
skip:
#ifdef CONFIG_BLK_DEV_IDEDMA