On Wed, 6 Jun 2007 19:21:22 +0900, Tejun Heo wrote: > sata_promise uses two different command modes - packet and TF. Packet > mode is intelligent low-overhead mode while TF is the same old > taskfile interface. As with other advanced interface (ahci/sil24), > ATA_TFLAG_POLLING has no effect in packet mode. However, PIO commands > are issued using TF interface in polling mode, so pdc_interrupt() > considers interrupts spurious if ATA_TFLAG_POLLING is set. > > This is broken for polling NODATA commands because command is issued > using packet mode but the interrupt handler ignores it due to > ATA_TFLAG_POLLING. Fix pdc_qc_issue_prot() such that ATA/ATAPI NODATA > commands are issued using TF interface if ATA_TFLAG_POLLING is set. > > This patch fixes detection failure introduced by polling SETXFERMODE. > > Signed-off-by: Tejun Heo <[EMAIL PROTECTED]> > --- > David, please verify this patch. Mikael, does this look okay? Please > push this upstream after David and Mikael's ack.
Thanks Tejun. I totally agree with the analysis and the solution. I considered bouncing polled commands back to libata, but Tejun beat me to it :-) Tested successfully with SATA and PATA disks on 20619, 20575, 20775, and 40718 chips. Acked-by: Mikael Pettersson <[EMAIL PROTECTED]> /Mikael > > (This repost is identical to the previous posting but it's now on the > correct thread.) > > Thanks. > > drivers/ata/sata_promise.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c > index 2b924a6..6dc0b01 100644 > --- a/drivers/ata/sata_promise.c > +++ b/drivers/ata/sata_promise.c > @@ -784,9 +784,12 @@ static unsigned int pdc_qc_issue_prot(struct > ata_queued_cmd *qc) > if (qc->dev->flags & ATA_DFLAG_CDB_INTR) > break; > /*FALLTHROUGH*/ > + case ATA_PROT_NODATA: > + if (qc->tf.flags & ATA_TFLAG_POLLING) > + break; > + /*FALLTHROUGH*/ > case ATA_PROT_ATAPI_DMA: > case ATA_PROT_DMA: > - case ATA_PROT_NODATA: > pdc_packet_start(qc); > return 0; > > @@ -800,7 +803,7 @@ static unsigned int pdc_qc_issue_prot(struct > ata_queued_cmd *qc) > static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile > *tf) > { > WARN_ON (tf->protocol == ATA_PROT_DMA || > - tf->protocol == ATA_PROT_NODATA); > + tf->protocol == ATA_PROT_ATAPI_DMA); > ata_tf_load(ap, tf); > } > > @@ -808,7 +811,7 @@ static void pdc_tf_load_mmio(struct ata_port *ap, const > struct ata_taskfile *tf) > static void pdc_exec_command_mmio(struct ata_port *ap, const struct > ata_taskfile *tf) > { > WARN_ON (tf->protocol == ATA_PROT_DMA || > - tf->protocol == ATA_PROT_NODATA); > + tf->protocol == ATA_PROT_ATAPI_DMA); > ata_exec_command(ap, tf); > } > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/