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libata: implement ATA_DFLAG_DUBIOUS_XFER

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ATA_DFLAG_DUBIOUS_XFER is set whenever data transfer speed or method
changes and gets cleared when data transfer command succeeds in the
newly configured transfer mode.

This will be used to improve speed down logic.

Signed-off-by: Tejun Heo <htejun@gmail.com<
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-11-27 19:28:58 +09:00
committed by Jeff Garzik
parent 663f99b86a
commit 00115e0f5b
3 changed files with 53 additions and 2 deletions
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19
drivers/ata/libata-core.c
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@@ -5797,6 +5797,22 @@ static void fill_result_tf(struct ata_queued_cmd *qc)
ap->ops->tf_read(ap, &qc->result_tf);
}
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
struct ata_device *dev = qc->dev;
if (ata_tag_internal(qc->tag))
return;
if (ata_is_nodata(qc->tf.protocol))
return;
if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
return;
dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}
/**
* ata_qc_complete - Complete an active ATA command
* @qc: Command to complete
@@ -5868,6 +5884,9 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
break;
}
if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
ata_verify_xfer(qc);
__ata_qc_complete(qc);
} else {
if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)