sata_promise: use TF interface for polling NODATA commands

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 <htejun@gmail.com>
Acked-by: Mikael Pettersson <mikpe@it.uu.se>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 2b924a69b365..6dc0b011a6b7 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);
 }