Backport the "pio flush" from the libata major update to 2.6.17 for via atapi.
Signed-off-by: Albert Lee <albertcc@xxxxxxxxxx>
---
According to Vincent's test result, adding the "pio flush"
fixes the via atapi problem. Maybe the VIA adapter caches the written
PIO data/ATAPI CDB packet?
Patch backported for mainline 2.6.17-rcX (f1adad78dd2fc8edaa513e0bde92b4c64340245c).
For your review, thanks.
--- mainline/drivers/scsi/libata-core.c 2006-05-22 10:53:36.000000000 +0800
+++ svia_atapi/drivers/scsi/libata-core.c 2006-05-22 11:25:28.000000000 +0800
@@ -3643,6 +3643,8 @@ static void ata_pio_block(struct ata_por
ata_pio_sector(qc);
}
+
+ ata_altstatus(ap); /* flush */
}
static void ata_pio_error(struct ata_port *ap)
@@ -3759,11 +3761,14 @@ static void atapi_packet_task(void *_dat
spin_lock_irqsave(&ap->host_set->lock, flags);
ap->flags &= ~ATA_FLAG_NOINTR;
ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
+ ata_altstatus(ap); /* flush */
+
if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
ap->ops->bmdma_start(qc); /* initiate bmdma */
spin_unlock_irqrestore(&ap->host_set->lock, flags);
} else {
ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
+ ata_altstatus(ap); /* flush */
/* PIO commands are handled by polling */
ap->hsm_task_state = HSM_ST;
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