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authorMark Lord <liml@rtr.ca>2008-05-17 13:36:30 -0400
committerJeff Garzik <jgarzik@redhat.com>2008-05-19 17:29:51 -0400
commit88e675e193159b9891c1c576de4348eaf490f5d0 (patch)
tree6af356c51ed75d862ac7aa731a9aeea49e340eb6 /drivers/ata
parentc4de573b14d78ac83861d81d12977457d1e9cb6d (diff)
sata_mv: fix pmp drives not found
Part three of simplifying/fixing handling of the main_irq_mask register to resolve unexpected interrupt issues observed in 2.6.26-rc*. Partially fix a reported bug whereby we sometimes miss seeing drives on a port-multiplier, as reported by Gwendal Grignou <gwendal@google.com>. The problem was that we were receiving unexpected interrupts during EH from POLLed commands while accessing port-multiplier registers. These unexpected interrupts can be prevented by masking the DONE_IRQ bit for the port whenever not operating in EDMA mode. Also fix port_stop() to mask all port interrupts. Signed-off-by: Mark Lord <mlord@pobox.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/sata_mv.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index d0fd83635fa..47dae7a2fbf 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -908,6 +908,7 @@ static void mv_start_dma(struct ata_port *ap, void __iomem *port_mmio,
writelfl(0, port_mmio + SATA_FIS_IRQ_CAUSE_OFS);
mv_set_edma_ptrs(port_mmio, hpriv, pp);
+ mv_enable_port_irqs(ap, DONE_IRQ|ERR_IRQ);
writelfl(EDMA_EN, port_mmio + EDMA_CMD_OFS);
pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
@@ -1360,6 +1361,7 @@ out_port_free_dma_mem:
static void mv_port_stop(struct ata_port *ap)
{
mv_stop_edma(ap);
+ mv_enable_port_irqs(ap, 0);
mv_port_free_dma_mem(ap);
}
@@ -1601,6 +1603,7 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
* shadow block, etc registers.
*/
mv_stop_edma(ap);
+ mv_enable_port_irqs(ap, ERR_IRQ);
mv_pmp_select(ap, qc->dev->link->pmp);
return ata_sff_qc_issue(qc);
}
@@ -2800,7 +2803,7 @@ static void mv_eh_thaw(struct ata_port *ap)
hc_irq_cause &= ~((DEV_IRQ | DMA_IRQ) << hardport);
writelfl(hc_irq_cause, hc_mmio + HC_IRQ_CAUSE_OFS);
- mv_enable_port_irqs(ap, DONE_IRQ | ERR_IRQ);
+ mv_enable_port_irqs(ap, ERR_IRQ);
}
/**