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Rearrange the order of I/O's in dma-start/stop, some chipsets are very

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picky on the order of this, especially in error situations.
This commit is contained in:
Søren Schmidt 2004-09-26 11:42:42 +00:00
parent 92d0921f8e
commit c5b2c44ce8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=135818
1 changed files with 2 additions and 2 deletions
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4
sys/dev/ata/ata-pci.c
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@ -436,11 +436,11 @@ ata_pci_dmastart(struct ata_channel *ch)
ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, (ATA_IDX_INB(ch, ATA_BMSTAT_PORT) |
(ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR)));
ATA_IDX_OUTL(ch, ATA_BMDTP_PORT, ch->dma->mdmatab);
ch->dma->flags |= ATA_DMA_ACTIVE;
ATA_IDX_OUTB(ch, ATA_BMCMD_PORT,
(ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_WRITE_READ) |
((ch->dma->flags & ATA_DMA_READ) ? ATA_BMCMD_WRITE_READ : 0) |
ATA_BMCMD_START_STOP);
ch->dma->flags |= ATA_DMA_ACTIVE;
return 0;
}
@ -449,10 +449,10 @@ ata_pci_dmastop(struct ata_channel *ch)
{
int error;
error = ATA_IDX_INB(ch, ATA_BMSTAT_PORT) & ATA_BMSTAT_MASK;
ATA_IDX_OUTB(ch, ATA_BMCMD_PORT,
ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_START_STOP);
ch->dma->flags &= ~ATA_DMA_ACTIVE;
error = ATA_IDX_INB(ch, ATA_BMSTAT_PORT) & ATA_BMSTAT_MASK;
ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR);
return error;
}