3 files changed, 11 insertions, 5 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 623cec914c9b..114fa81deb83 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -870,7 +870,8 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int
                         pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;
                 bmdma = pci_resource_start(pdev, 4);
                 if (bmdma) {
-                        if (inb(bmdma + 2) & 0x80)
+                        if ((!(port[p]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
+                            (inb(bmdma + 2) & 0x80))
                                 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
                         probe_ent->port[p].bmdma_addr = bmdma;
                 }
@@ -886,7 +887,8 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int
                 bmdma = pci_resource_start(pdev, 4);
                 if (bmdma) {
                         bmdma += 8;
-                        if(inb(bmdma + 2) & 0x80)
+                        if ((!(port[p]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
+                            (inb(bmdma + 2) & 0x80))
                                 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
                         probe_ent->port[p].bmdma_addr = bmdma;
                 }
@@ -920,7 +922,8 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
                 probe_ent->port[0].ctl_addr = ATA_PRIMARY_CTL;
                 if (bmdma) {
                         probe_ent->port[0].bmdma_addr = bmdma;
-                        if (inb(bmdma + 2) & 0x80)
+                        if ((!(port[0]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
+                            (inb(bmdma + 2) & 0x80))
                                 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
                 }
                 ata_std_ports(&probe_ent->port[0]);
@@ -937,7 +940,8 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
                 probe_ent->port[1].ctl_addr = ATA_SECONDARY_CTL;
                 if (bmdma) {
                         probe_ent->port[1].bmdma_addr = bmdma + 8;
-                        if (inb(bmdma + 10) & 0x80)
+                        if ((!(port[1]->flags & ATA_FLAG_IGN_SIMPLEX)) &&
+                            (inb(bmdma + 10) & 0x80))
                                 probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
                 }
                 ata_std_ports(&probe_ent->port[1]);
diff --git a/drivers/ata/sata_uli.c b/drivers/ata/sata_uli.c
index 5c603ca3a50a..a43aec62d505 100644
--- a/drivers/ata/sata_uli.c
+++ b/drivers/ata/sata_uli.c
@@ -128,7 +128,8 @@ static const struct ata_port_operations uli_ops = {
 
 static struct ata_port_info uli_port_info = {
         .sht            = &uli_sht,
-        .flags          = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+        .flags          = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                          ATA_FLAG_IGN_SIMPLEX,
         .pio_mask       = 0x1f,         /* pio0-4 */
         .udma_mask      = 0x7f,         /* udma0-6 */
         .port_ops       = &uli_ops,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index df76fc467816..22aa69e20905 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -177,6 +177,7 @@ enum {
                                               * Register FIS clearing BSY */
         ATA_FLAG_DEBUGMSG       = (1 << 13),
         ATA_FLAG_SETXFER_POLLING= (1 << 14), /* use polling for SETXFER */
+        ATA_FLAG_IGN_SIMPLEX    = (1 << 15), /* ignore SIMPLEX */
 
         /* The following flag belongs to ap->pflags but is kept in
          * ap->flags because it's referenced in many LLDs and will be