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sata_mv: fix pmp drives not found

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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>
This commit is contained in:
Mark Lord 2008-05-17 13:36:30 -04:00 committed by Jeff Garzik
parent c4de573b14
commit 88e675e193
1 changed files with 4 additions and 1 deletions
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5
drivers/ata/sata_mv.c
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@ -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);
}
/**