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-rw-r--r--drivers/scsi/libata-core.c4
-rw-r--r--include/linux/libata.h9
2 files changed, 10 insertions, 3 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index b42acbe0e9a5..e6044455ca45 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -611,6 +611,10 @@ int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
if (dev->flags & ATA_DFLAG_PIO) {
tf->protocol = ATA_PROT_PIO;
index = dev->multi_count ? 0 : 8;
+ } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
+ /* Unable to use DMA due to host limitation */
+ tf->protocol = ATA_PROT_PIO;
+ index = dev->multi_count ? 0 : 4;
} else {
tf->protocol = ATA_PROT_DMA;
index = 16;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index af6624450f65..9e5db2949c58 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -126,16 +126,19 @@ enum {
ATA_FLAG_SUSPENDED = (1 << 12), /* port is suspended */
+ ATA_FLAG_PIO_LBA48 = (1 << 13), /* Host DMA engine is LBA28 only */
+ ATA_FLAG_IRQ_MASK = (1 << 14), /* Mask IRQ in PIO xfers */
+
ATA_QCFLAG_ACTIVE = (1 << 1), /* cmd not yet ack'd to scsi lyer */
ATA_QCFLAG_SG = (1 << 3), /* have s/g table? */
ATA_QCFLAG_SINGLE = (1 << 4), /* no s/g, just a single buffer */
ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
/* various lengths of time */
- ATA_TMOUT_EDD = 5 * HZ, /* hueristic */
+ ATA_TMOUT_EDD = 5 * HZ, /* heuristic */
ATA_TMOUT_PIO = 30 * HZ,
- ATA_TMOUT_BOOT = 30 * HZ, /* hueristic */
- ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* hueristic */
+ ATA_TMOUT_BOOT = 30 * HZ, /* heuristic */
+ ATA_TMOUT_BOOT_QUICK = 7 * HZ, /* heuristic */
ATA_TMOUT_CDB = 30 * HZ,
ATA_TMOUT_CDB_QUICK = 5 * HZ,
ATA_TMOUT_INTERNAL = 30 * HZ,