Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev

* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  [PATCH] sata_mv: three bug fixes
  [PATCH] libata: ata_dev_init_params() fixes
  [PATCH] libata: Fix interesting use of "extern" and also some bracketing
  [PATCH] libata: Simplex and other mode filtering logic
  [PATCH] libata - ATA is both ATA and CFA
  [PATCH] libata: Add ->set_mode hook for odd drivers
  [PATCH] libata: BMDMA handling updates
  [PATCH] libata: kill trailing whitespace
  [PATCH] libata: add FIXME above ata_dev_xfermask()
  [PATCH] libata: cosmetic changes in ata_bus_softreset()
  [PATCH] libata: kill E.D.D.

5 files changed, 164 insertions, 129 deletions

diff --git a/Documentation/DocBook/libata.tmpl b/Documentation/DocBook/libata.tmpl
index d260d92089ad..5bcbb6ee3bc0 100644
--- a/Documentation/DocBook/libata.tmpl
+++ b/Documentation/DocBook/libata.tmpl
@@ -120,14 +120,27 @@ void (*dev_config) (struct ata_port *, struct ata_device *);
         <programlisting>
 void (*set_piomode) (struct ata_port *, struct ata_device *);
 void (*set_dmamode) (struct ata_port *, struct ata_device *);
-void (*post_set_mode) (struct ata_port *ap);
+void (*post_set_mode) (struct ata_port *);
+unsigned int (*mode_filter) (struct ata_port *, struct ata_device *, unsigned int);
         </programlisting>
 
         <para>
         Hooks called prior to the issue of SET FEATURES - XFER MODE
-        command.  dev->pio_mode is guaranteed to be valid when
-        ->set_piomode() is called, and dev->dma_mode is guaranteed to be
-        valid when ->set_dmamode() is called.  ->post_set_mode() is
+        command.  The optional ->mode_filter() hook is called when libata
+        has built a mask of the possible modes. This is passed to the 
+        ->mode_filter() function which should return a mask of valid modes
+        after filtering those unsuitable due to hardware limits. It is not
+        valid to use this interface to add modes.
+        </para>
+        <para>
+        dev->pio_mode and dev->dma_mode are guaranteed to be valid when
+        ->set_piomode() and when ->set_dmamode() is called. The timings for
+        any other drive sharing the cable will also be valid at this point.
+        That is the library records the decisions for the modes of each
+        drive on a channel before it attempts to set any of them.
+        </para>
+        <para>
+        ->post_set_mode() is
         called unconditionally, after the SET FEATURES - XFER MODE
         command completes successfully.
         </para>
@@ -230,6 +243,32 @@ void (*dev_select)(struct ata_port *ap, unsigned int device);
 
         </sect2>
 
+        <sect2><title>Private tuning method</title>
+        <programlisting>
+void (*set_mode) (struct ata_port *ap);
+        </programlisting>
+
+        <para>
+        By default libata performs drive and controller tuning in
+        accordance with the ATA timing rules and also applies blacklists
+        and cable limits. Some controllers need special handling and have
+        custom tuning rules, typically raid controllers that use ATA
+        commands but do not actually do drive timing.
+        </para>
+
+        <warning>
+        <para>
+        This hook should not be used to replace the standard controller
+        tuning logic when a controller has quirks. Replacing the default
+        tuning logic in that case would bypass handling for drive and
+        bridge quirks that may be important to data reliability. If a
+        controller needs to filter the mode selection it should use the
+        mode_filter hook instead.
+        </para>
+        </warning>
+
+        </sect2>
+
         <sect2><title>Reset ATA bus</title>
         <programlisting>
 void (*phy_reset) (struct ata_port *ap);
diff --git a/drivers/scsi/libata-bmdma.c b/drivers/scsi/libata-bmdma.c
index 95d81d86d8b7..835dff0bafdc 100644
--- a/drivers/scsi/libata-bmdma.c
+++ b/drivers/scsi/libata-bmdma.c
@@ -703,6 +703,7 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int
         struct ata_probe_ent *probe_ent =
                 ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
         int p = 0;
+        unsigned long bmdma;
 
         if (!probe_ent)
                 return NULL;
@@ -716,7 +717,12 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int
                 probe_ent->port[p].altstatus_addr =
                 probe_ent->port[p].ctl_addr =
                         pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;
-                probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4);
+                bmdma = pci_resource_start(pdev, 4);
+                if (bmdma) {
+                        if (inb(bmdma + 2) & 0x80)
+                                probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;
+                        probe_ent->port[p].bmdma_addr = bmdma;
+                }
                 ata_std_ports(&probe_ent->port[p]);
                 p++;
         }
@@ -726,7 +732,13 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int
                 probe_ent->port[p].altstatus_addr =
                 probe_ent->port[p].ctl_addr =
                         pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS;
-                probe_ent->port[p].bmdma_addr = pci_resource_start(pdev, 4) + 8;
+                bmdma = pci_resource_start(pdev, 4);
+                if (bmdma) {
+                        bmdma += 8;
+                        if(inb(bmdma + 2) & 0x80)
+                        probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;
+                        probe_ent->port[p].bmdma_addr = bmdma;
+                }
                 ata_std_ports(&probe_ent->port[p]);
                 p++;
         }
@@ -740,6 +752,7 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
                                 struct ata_port_info *port, int port_num)
 {
         struct ata_probe_ent *probe_ent;
+        unsigned long bmdma;
 
         probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port);
         if (!probe_ent)
@@ -766,8 +779,13 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
                         break;
         }
 
-        probe_ent->port[0].bmdma_addr =
-                pci_resource_start(pdev, 4) + 8 * port_num;
+        bmdma = pci_resource_start(pdev, 4);
+        if (bmdma != 0) {
+                bmdma += 8 * port_num;
+                probe_ent->port[0].bmdma_addr = bmdma;
+                if (inb(bmdma + 2) & 0x80)
+                        probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;
+        }
         ata_std_ports(&probe_ent->port[0]);
 
         return probe_ent;
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index d279666dcb38..21b0ed583b8a 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -62,7 +62,9 @@
 #include "libata.h"
 
 static unsigned int ata_dev_init_params(struct ata_port *ap,
-                                        struct ata_device *dev);
+                                        struct ata_device *dev,
+                                        u16 heads,
+                                        u16 sectors);
 static void ata_set_mode(struct ata_port *ap);
 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
                                          struct ata_device *dev);
@@ -1081,9 +1083,8 @@ unsigned int ata_pio_need_iordy(const struct ata_device *adev)
  *
  *      Read ID data from the specified device.  ATA_CMD_ID_ATA is
  *      performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
- *      devices.  This function also takes care of EDD signature
- *      misreporting (to be removed once EDD support is gone) and
- *      issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
+ *      devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
+ *      for pre-ATA4 drives.
  *
  *      LOCKING:
  *      Kernel thread context (may sleep)
@@ -1095,7 +1096,6 @@ static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
                            unsigned int *p_class, int post_reset, u16 **p_id)
 {
         unsigned int class = *p_class;
-        unsigned int using_edd;
         struct ata_taskfile tf;
         unsigned int err_mask = 0;
         u16 *id;
@@ -1104,12 +1104,6 @@ static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
 
         DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
 
-        if (ap->ops->probe_reset ||
-            ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
-                using_edd = 0;
-        else
-                using_edd = 1;
-
         ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 
         id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
@@ -1139,39 +1133,16 @@ static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
 
         err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
                                      id, sizeof(id[0]) * ATA_ID_WORDS);
-
         if (err_mask) {
                 rc = -EIO;
                 reason = "I/O error";
-
-                if (err_mask & ~AC_ERR_DEV)
-                        goto err_out;
-
-                /*
-                 * arg!  EDD works for all test cases, but seems to return
-                 * the ATA signature for some ATAPI devices.  Until the
-                 * reason for this is found and fixed, we fix up the mess
-                 * here.  If IDENTIFY DEVICE returns command aborted
-                 * (as ATAPI devices do), then we issue an
-                 * IDENTIFY PACKET DEVICE.
-                 *
-                 * ATA software reset (SRST, the default) does not appear
-                 * to have this problem.
-                 */
-                if ((using_edd) && (class == ATA_DEV_ATA)) {
-                        u8 err = tf.feature;
-                        if (err & ATA_ABORTED) {
-                                class = ATA_DEV_ATAPI;
-                                goto retry;
-                        }
-                }
                 goto err_out;
         }
 
         swap_buf_le16(id, ATA_ID_WORDS);
 
         /* sanity check */
-        if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
+        if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
                 rc = -EINVAL;
                 reason = "device reports illegal type";
                 goto err_out;
@@ -1187,7 +1158,7 @@ static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
                  * Some drives were very specific about that exact sequence.
                  */
                 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
-                        err_mask = ata_dev_init_params(ap, dev);
+                        err_mask = ata_dev_init_params(ap, dev, id[3], id[6]);
                         if (err_mask) {
                                 rc = -EIO;
                                 reason = "INIT_DEV_PARAMS failed";
@@ -1440,7 +1411,11 @@ static int ata_bus_probe(struct ata_port *ap)
         if (!found)
                 goto err_out_disable;
 
-        ata_set_mode(ap);
+        if (ap->ops->set_mode)
+                ap->ops->set_mode(ap);
+        else
+                ata_set_mode(ap);
+
         if (ap->flags & ATA_FLAG_PORT_DISABLED)
                 goto err_out_disable;
 
@@ -1845,7 +1820,7 @@ static void ata_host_set_dma(struct ata_port *ap)
  */
 static void ata_set_mode(struct ata_port *ap)
 {
-        int i, rc;
+        int i, rc, used_dma = 0;
 
         /* step 1: calculate xfer_mask */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
@@ -1863,6 +1838,9 @@ static void ata_set_mode(struct ata_port *ap)
                 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
                 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
                 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
+
+                if (dev->dma_mode)
+                        used_dma = 1;
         }
 
         /* step 2: always set host PIO timings */
@@ -1884,6 +1862,17 @@ static void ata_set_mode(struct ata_port *ap)
                         goto err_out;
         }
 
+        /*
+         *      Record simplex status. If we selected DMA then the other
+         *      host channels are not permitted to do so.
+         */
+
+        if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
+                ap->host_set->simplex_claimed = 1;
+
+        /*
+         *      Chip specific finalisation
+         */
         if (ap->ops->post_set_mode)
                 ap->ops->post_set_mode(ap);
 
@@ -2005,45 +1994,6 @@ static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
                 ap->ops->dev_select(ap, 0);
 }
 
-/**
- *      ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
- *      @ap: Port to reset and probe
- *
- *      Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
- *      probe the bus.  Not often used these days.
- *
- *      LOCKING:
- *      PCI/etc. bus probe sem.
- *      Obtains host_set lock.
- *
- */
-
-static unsigned int ata_bus_edd(struct ata_port *ap)
-{
-        struct ata_taskfile tf;
-        unsigned long flags;
-
-        /* set up execute-device-diag (bus reset) taskfile */
-        /* also, take interrupts to a known state (disabled) */
-        DPRINTK("execute-device-diag\n");
-        ata_tf_init(ap, &tf, 0);
-        tf.ctl |= ATA_NIEN;
-        tf.command = ATA_CMD_EDD;
-        tf.protocol = ATA_PROT_NODATA;
-
-        /* do bus reset */
-        spin_lock_irqsave(&ap->host_set->lock, flags);
-        ata_tf_to_host(ap, &tf);
-        spin_unlock_irqrestore(&ap->host_set->lock, flags);
-
-        /* spec says at least 2ms.  but who knows with those
-         * crazy ATAPI devices...
-         */
-        msleep(150);
-
-        return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
-}
-
 static unsigned int ata_bus_softreset(struct ata_port *ap,
                                       unsigned int devmask)
 {
@@ -2078,13 +2028,12 @@ static unsigned int ata_bus_softreset(struct ata_port *ap,
          */
         msleep(150);
 
-
         /* Before we perform post reset processing we want to see if
-           the bus shows 0xFF because the odd clown forgets the D7 pulldown
-           resistor */
-
+         * the bus shows 0xFF because the odd clown forgets the D7
+         * pulldown resistor.
+         */
         if (ata_check_status(ap) == 0xFF)
-                return 1;       /* Positive is failure for some reason */
+                return AC_ERR_OTHER;
 
         ata_bus_post_reset(ap, devmask);
 
@@ -2116,7 +2065,7 @@ void ata_bus_reset(struct ata_port *ap)
         struct ata_ioports *ioaddr = &ap->ioaddr;
         unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
         u8 err;
-        unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
+        unsigned int dev0, dev1 = 0, devmask = 0;
 
         DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
 
@@ -2139,18 +2088,8 @@ void ata_bus_reset(struct ata_port *ap)
 
         /* issue bus reset */
         if (ap->flags & ATA_FLAG_SRST)
-                rc = ata_bus_softreset(ap, devmask);
-        else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
-                /* set up device control */
-                if (ap->flags & ATA_FLAG_MMIO)
-                        writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
-                else
-                        outb(ap->ctl, ioaddr->ctl_addr);
-                rc = ata_bus_edd(ap);
-        }
-
-        if (rc)
-                goto err_out;
+                if (ata_bus_softreset(ap, devmask))
+                        goto err_out;
 
         /*
          * determine by signature whether we have ATA or ATAPI devices
@@ -2223,9 +2162,9 @@ static int sata_phy_resume(struct ata_port *ap)
  *      so makes reset sequence different from the original
  *      ->phy_reset implementation and Jeff nervous.  :-P
  */
-extern void ata_std_probeinit(struct ata_port *ap)
+void ata_std_probeinit(struct ata_port *ap)
 {
-        if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
+        if ((ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read) {
                 sata_phy_resume(ap);
                 if (sata_dev_present(ap))
                         ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
@@ -2714,18 +2653,23 @@ static int ata_dma_blacklisted(const struct ata_device *dev)
  *      known limits including host controller limits, device
  *      blacklist, etc...
  *
+ *      FIXME: The current implementation limits all transfer modes to
+ *      the fastest of the lowested device on the port.  This is not
+ *      required on most controllers.
+ *
  *      LOCKING:
  *      None.
  */
 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
 {
+        struct ata_host_set *hs = ap->host_set;
         unsigned long xfer_mask;
         int i;
 
         xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
                                       ap->udma_mask);
 
-        /* use port-wide xfermask for now */
+        /* FIXME: Use port-wide xfermask for now */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
                 struct ata_device *d = &ap->device[i];
                 if (!ata_dev_present(d))
@@ -2735,12 +2679,23 @@ static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
                 xfer_mask &= ata_id_xfermask(d->id);
                 if (ata_dma_blacklisted(d))
                         xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+                /* Apply cable rule here. Don't apply it early because when
+                   we handle hot plug the cable type can itself change */
+                if (ap->cbl == ATA_CBL_PATA40)
+                        xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
         }
 
         if (ata_dma_blacklisted(dev))
                 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
                        "disabling DMA\n", ap->id, dev->devno);
 
+        if (hs->flags & ATA_HOST_SIMPLEX) {
+                if (hs->simplex_claimed)
+                        xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+        }
+        if (ap->ops->mode_filter)
+                xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
+
         ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
                             &dev->udma_mask);
 }
@@ -2795,16 +2750,16 @@ static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
  */
 
 static unsigned int ata_dev_init_params(struct ata_port *ap,
-                                        struct ata_device *dev)
+                                        struct ata_device *dev,
+                                        u16 heads,
+                                        u16 sectors)
 {
         struct ata_taskfile tf;
         unsigned int err_mask;
-        u16 sectors = dev->id[6];
-        u16 heads   = dev->id[3];
 
         /* Number of sectors per track 1-255. Number of heads 1-16 */
         if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
-                return 0;
+                return AC_ERR_INVALID;
 
         /* set up init dev params taskfile */
         DPRINTK("init dev params \n");
@@ -4536,6 +4491,14 @@ static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
         int rc;
 
         DPRINTK("ENTER\n");
+
+        if (!ent->port_ops->probe_reset &&
+            !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
+                printk(KERN_ERR "ata%u: no reset mechanism available\n",
+                       port_no);
+                return NULL;
+        }
+
         host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
         if (!host)
                 return NULL;
@@ -4596,6 +4559,7 @@ int ata_device_add(const struct ata_probe_ent *ent)
         host_set->mmio_base = ent->mmio_base;
         host_set->private_data = ent->private_data;
         host_set->ops = ent->port_ops;
+        host_set->flags = ent->host_set_flags;
 
         /* register each port bound to this device */
         for (i = 0; i < ent->n_ports; i++) {
diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index 275ed9bd898c..fa901fd65085 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -1010,7 +1010,7 @@ static void mv_fill_sg(struct ata_queued_cmd *qc)
 
                         pp->sg_tbl[i].addr = cpu_to_le32(addr & 0xffffffff);
                         pp->sg_tbl[i].addr_hi = cpu_to_le32((addr >> 16) >> 16);
-                        pp->sg_tbl[i].flags_size = cpu_to_le32(len);
+                        pp->sg_tbl[i].flags_size = cpu_to_le32(len & 0xffff);
 
                         sg_len -= len;
                         addr += len;
@@ -1350,7 +1350,6 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
 {
         void __iomem *mmio = host_set->mmio_base;
         void __iomem *hc_mmio = mv_hc_base(mmio, hc);
-        struct ata_port *ap;
         struct ata_queued_cmd *qc;
         u32 hc_irq_cause;
         int shift, port, port0, hard_port, handled;
@@ -1373,25 +1372,32 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
 
         for (port = port0; port < port0 + MV_PORTS_PER_HC; port++) {
                 u8 ata_status = 0;
-                ap = host_set->ports[port];
+                struct ata_port *ap = host_set->ports[port];
+                struct mv_port_priv *pp = ap->private_data;
+
                 hard_port = port & MV_PORT_MASK;        /* range 0-3 */
                 handled = 0;    /* ensure ata_status is set if handled++ */
 
-                if ((CRPB_DMA_DONE << hard_port) & hc_irq_cause) {
-                        /* new CRPB on the queue; just one at a time until NCQ
-                         */
-                        ata_status = mv_get_crpb_status(ap);
-                        handled++;
-                } else if ((DEV_IRQ << hard_port) & hc_irq_cause) {
-                        /* received ATA IRQ; read the status reg to clear INTRQ
-                         */
-                        ata_status = readb((void __iomem *)
+                /* Note that DEV_IRQ might happen spuriously during EDMA,
+                 * and should be ignored in such cases.  We could mask it,
+                 * but it's pretty rare and may not be worth the overhead.
+                 */ 
+                if (pp->pp_flags & MV_PP_FLAG_EDMA_EN) {
+                        /* EDMA: check for response queue interrupt */
+                        if ((CRPB_DMA_DONE << hard_port) & hc_irq_cause) {
+                                ata_status = mv_get_crpb_status(ap);
+                                handled = 1;
+                        }
+                } else {
+                        /* PIO: check for device (drive) interrupt */
+                        if ((DEV_IRQ << hard_port) & hc_irq_cause) {
+                                ata_status = readb((void __iomem *)
                                            ap->ioaddr.status_addr);
-                        handled++;
+                                handled = 1;
+                        }
                 }
 
-                if (ap &&
-                    (ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR)))
+                if (ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))
                         continue;
 
                 err_mask = ac_err_mask(ata_status);
@@ -1403,12 +1409,12 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
                 if ((PORT0_ERR << shift) & relevant) {
                         mv_err_intr(ap);
                         err_mask |= AC_ERR_OTHER;
-                        handled++;
+                        handled = 1;
                 }
 
-                if (handled && ap) {
+                if (handled) {
                         qc = ata_qc_from_tag(ap, ap->active_tag);
-                        if (NULL != qc) {
+                        if (qc && (qc->flags & ATA_QCFLAG_ACTIVE)) {
                                 VPRINTK("port %u IRQ found for qc, "
                                         "ata_status 0x%x\n", port,ata_status);
                                 /* mark qc status appropriately */
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 047192253c3a..0d61357604d5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -160,8 +160,10 @@ enum {
         ATA_QCFLAG_DMAMAP       = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
         ATA_QCFLAG_EH_SCHEDULED = (1 << 5), /* EH scheduled */
 
+        /* host set flags */
+        ATA_HOST_SIMPLEX        = (1 << 0),     /* Host is simplex, one DMA channel per host_set only */
+        
         /* various lengths of time */
-        ATA_TMOUT_EDD           = 5 * HZ,       /* heuristic */
         ATA_TMOUT_PIO           = 30 * HZ,
         ATA_TMOUT_BOOT          = 30 * HZ,      /* heuristic */
         ATA_TMOUT_BOOT_QUICK    = 7 * HZ,       /* heuristic */
@@ -279,6 +281,7 @@ struct ata_probe_ent {
         unsigned long           irq;
         unsigned int            irq_flags;
         unsigned long           host_flags;
+        unsigned long           host_set_flags;
         void __iomem            *mmio_base;
         void                    *private_data;
 };
@@ -291,6 +294,9 @@ struct ata_host_set {
         unsigned int            n_ports;
         void                    *private_data;
         const struct ata_port_operations *ops;
+        unsigned long           flags;
+        int                     simplex_claimed;        /* Keep seperate in case we
+                                                           ever need to do this locked */
         struct ata_port *       ports[0];
 };
 
@@ -420,6 +426,7 @@ struct ata_port_operations {
 
         void (*set_piomode) (struct ata_port *, struct ata_device *);
         void (*set_dmamode) (struct ata_port *, struct ata_device *);
+        unsigned long (*mode_filter) (const struct ata_port *, struct ata_device *, unsigned long);
 
         void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
         void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
@@ -430,6 +437,7 @@ struct ata_port_operations {
         void (*dev_select)(struct ata_port *ap, unsigned int device);
 
         void (*phy_reset) (struct ata_port *ap); /* obsolete */
+        void (*set_mode) (struct ata_port *ap);
         int (*probe_reset) (struct ata_port *ap, unsigned int *classes);
 
         void (*post_set_mode) (struct ata_port *ap);