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

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  libata and starting/stopping ATAPI floppy devices
  sata_sil24: prevent hba lockup when pass-through ATA commands are used
  Update kernel parameter document for libata DMA mode setting knobs.
  libata: don't normalize UNKNOWN to NONE after reset
  libata-pmp: propagate timeout to host link
  libata-pmp: 4726 hates SRST
  pata_ixp4xx_cf: fix compilation introduced by ata_port_desc() conversion
  pata_pdc202xx_old: Further fixups
  libata-sff: PCI IRQ handling fix
  sata_qstor: use hardreset instead of softreset

9 files changed, 78 insertions, 33 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e5b447a0acda..c4178778e7fd 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -883,6 +883,14 @@ and is between 256 and 4096 characters. It is defined in the file
         lapic_timer_c2_ok       [X86-32,x86-64,APIC] trust the local apic timer in
                         C2 power state.
 
+        libata.dma=     [LIBATA] DMA control
+                        libata.dma=0      Disable all PATA and SATA DMA
+                        libata.dma=1      PATA and SATA Disk DMA only
+                        libata.dma=2      ATAPI (CDROM) DMA only
+                        libata.dma=4      Compact Flash DMA only 
+                        Combinations also work, so libata.dma=3 enables DMA
+                        for disks and CDROMs, but not CFs.
+
         libata.noacpi   [LIBATA] Disables use of ACPI in libata suspend/resume
                         when set.
                         Format: <int>
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index f0124a8d3134..21a81cd148e4 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1733,11 +1733,15 @@ static void ata_eh_link_autopsy(struct ata_link *link)
                 ehc->i.action &= ~ATA_EH_PERDEV_MASK;
         }
 
-        /* consider speeding down */
+        /* propagate timeout to host link */
+        if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
+                ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
+
+        /* record error and consider speeding down */
         dev = ehc->i.dev;
-        if (!dev && ata_link_max_devices(link) == 1 &&
-            ata_dev_enabled(link->device))
-                dev = link->device;
+        if (!dev && ((ata_link_max_devices(link) == 1 &&
+                      ata_dev_enabled(link->device))))
+            dev = link->device;
 
         if (dev)
                 ehc->i.action |= ata_eh_speed_down(dev, is_io, all_err_mask);
@@ -1759,8 +1763,14 @@ void ata_eh_autopsy(struct ata_port *ap)
 {
         struct ata_link *link;
 
-        __ata_port_for_each_link(link, ap)
+        ata_port_for_each_link(link, ap)
                 ata_eh_link_autopsy(link);
+
+        /* Autopsy of fanout ports can affect host link autopsy.
+         * Perform host link autopsy last.
+         */
+        if (ap->nr_pmp_links)
+                ata_eh_link_autopsy(&ap->link);
 }
 
 /**
@@ -2157,13 +2167,11 @@ int ata_eh_reset(struct ata_link *link, int classify,
                 if (ata_link_offline(link))
                         continue;
 
-                /* apply class override and convert UNKNOWN to NONE */
+                /* apply class override */
                 if (lflags & ATA_LFLAG_ASSUME_ATA)
                         classes[dev->devno] = ATA_DEV_ATA;
                 else if (lflags & ATA_LFLAG_ASSUME_SEMB)
                         classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
-                else if (classes[dev->devno] == ATA_DEV_UNKNOWN)
-                        classes[dev->devno] = ATA_DEV_NONE;
         }
 
         /* record current link speed */
diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
index c0c4dbcde091..caef2bbd4a8a 100644
--- a/drivers/ata/libata-pmp.c
+++ b/drivers/ata/libata-pmp.c
@@ -495,14 +495,12 @@ static void sata_pmp_quirks(struct ata_port *ap)
                         /* SError.N need a kick in the ass to get working */
                         link->flags |= ATA_LFLAG_HRST_TO_RESUME;
 
-                        /* class code report is unreliable */
-                        if (link->pmp < 5)
-                                link->flags |= ATA_LFLAG_ASSUME_ATA;
-
-                        /* The config device, which can be either at
-                         * port 0 or 5, locks up on SRST.
+                        /* Class code report is unreliable and SRST
+                         * times out under certain configurations.
+                         * Config device can be at port 0 or 5 and
+                         * locks up on SRST.
                          */
-                        if (link->pmp == 0 || link->pmp == 5)
+                        if (link->pmp <= 5)
                                 link->flags |= ATA_LFLAG_NO_SRST |
                                                ATA_LFLAG_ASSUME_ATA;
 
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a883bb03d4c7..264ae60e3fd8 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -872,7 +872,8 @@ int ata_scsi_slave_config(struct scsi_device *sdev)
 
         ata_scsi_sdev_config(sdev);
 
-        sdev->manage_start_stop = 1;
+        if (dev->class == ATA_DEV_ATA)
+                sdev->manage_start_stop = 1;
 
         if (dev)
                 ata_scsi_dev_config(sdev, dev);
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 48acc09dab96..b7ac80b4b1fb 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -806,7 +806,10 @@ int ata_pci_init_one(struct pci_dev *pdev,
         if (rc)
                 goto err_out;
 
-        if (!legacy_mode) {
+        if (!legacy_mode && pdev->irq) {
+                /* We may have no IRQ assigned in which case we can poll. This
+                   shouldn't happen on a sane system but robustness is cheap
+                   in this case */
                 rc = devm_request_irq(dev, pdev->irq, pi->port_ops->irq_handler,
                                       IRQF_SHARED, DRV_NAME, host);
                 if (rc)
@@ -814,7 +817,7 @@ int ata_pci_init_one(struct pci_dev *pdev,
 
                 ata_port_desc(host->ports[0], "irq %d", pdev->irq);
                 ata_port_desc(host->ports[1], "irq %d", pdev->irq);
-        } else {
+        } else if (legacy_mode) {
                 if (!ata_port_is_dummy(host->ports[0])) {
                         rc = devm_request_irq(dev, ATA_PRIMARY_IRQ(pdev),
                                               pi->port_ops->irq_handler,
diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c
index fcd532afbf2e..120b5bfa7ce6 100644
--- a/drivers/ata/pata_ixp4xx_cf.c
+++ b/drivers/ata/pata_ixp4xx_cf.c
@@ -130,10 +130,11 @@ static struct ata_port_operations ixp4xx_port_ops = {
         .port_start             = ata_port_start,
 };
 
-static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
+static void ixp4xx_setup_port(struct ata_port *ap,
                               struct ixp4xx_pata_data *data,
                               unsigned long raw_cs0, unsigned long raw_cs1)
 {
+        struct ata_ioports *ioaddr = &ap->ioaddr;
         unsigned long raw_cmd = raw_cs0;
         unsigned long raw_ctl = raw_cs1 + 0x06;
 
diff --git a/drivers/ata/pata_pdc202xx_old.c b/drivers/ata/pata_pdc202xx_old.c
index bc7c2d5d8d5e..8f2815601791 100644
--- a/drivers/ata/pata_pdc202xx_old.c
+++ b/drivers/ata/pata_pdc202xx_old.c
@@ -215,8 +215,8 @@ static void pdc2026x_bmdma_stop(struct ata_queued_cmd *qc)
         /* Flip back to 33Mhz for PIO */
         if (adev->dma_mode >= XFER_UDMA_2)
                 iowrite8(ioread8(clock) & ~sel66, clock);
-
         ata_bmdma_stop(qc);
+        pdc202xx_set_piomode(ap, adev);
 }
 
 /**
@@ -233,6 +233,17 @@ static void pdc2026x_dev_config(struct ata_device *adev)
         adev->max_sectors = 256;
 }
 
+static int pdc2026x_port_start(struct ata_port *ap)
+{
+        void __iomem *bmdma = ap->ioaddr.bmdma_addr;
+        if (bmdma) {
+                /* Enable burst mode */
+                u8 burst = ioread8(bmdma + 0x1f);
+                iowrite8(burst | 0x01, bmdma + 0x1f);
+        }
+        return ata_sff_port_start(ap);
+}
+
 static struct scsi_host_template pdc202xx_sht = {
         .module                 = THIS_MODULE,
         .name                   = DRV_NAME,
@@ -313,7 +324,7 @@ static struct ata_port_operations pdc2026x_port_ops = {
         .irq_clear      = ata_bmdma_irq_clear,
         .irq_on         = ata_irq_on,
 
-        .port_start     = ata_sff_port_start,
+        .port_start     = pdc2026x_port_start,
 };
 
 static int pdc202xx_init_one(struct pci_dev *dev, const struct pci_device_id *id)
diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index 2f1de6ec044c..c68b241805fd 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -270,7 +270,7 @@ static int qs_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
 static void qs_error_handler(struct ata_port *ap)
 {
         qs_enter_reg_mode(ap);
-        ata_do_eh(ap, qs_prereset, ata_std_softreset, NULL,
+        ata_do_eh(ap, qs_prereset, NULL, sata_std_hardreset,
                   ata_std_postreset);
 }
 
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 96fd5260446d..b4c674d83769 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -832,16 +832,31 @@ static int sil24_qc_defer(struct ata_queued_cmd *qc)
         struct ata_link *link = qc->dev->link;
         struct ata_port *ap = link->ap;
         u8 prot = qc->tf.protocol;
-        int is_atapi = (prot == ATA_PROT_ATAPI ||
-                        prot == ATA_PROT_ATAPI_NODATA ||
-                        prot == ATA_PROT_ATAPI_DMA);
-
-        /* ATAPI commands completing with CHECK_SENSE cause various
-         * weird problems if other commands are active.  PMP DMA CS
-         * errata doesn't cover all and HSM violation occurs even with
-         * only one other device active.  Always run an ATAPI command
-         * by itself.
-         */
+
+        /*
+         * There is a bug in the chip:
+         * Port LRAM Causes the PRB/SGT Data to be Corrupted
+         * If the host issues a read request for LRAM and SActive registers
+         * while active commands are available in the port, PRB/SGT data in
+         * the LRAM can become corrupted. This issue applies only when
+         * reading from, but not writing to, the LRAM.
+         *
+         * Therefore, reading LRAM when there is no particular error [and
+         * other commands may be outstanding] is prohibited.
+         *
+         * To avoid this bug there are two situations where a command must run
+         * exclusive of any other commands on the port:
+         *
+         * - ATAPI commands which check the sense data
+         * - Passthrough ATA commands which always have ATA_QCFLAG_RESULT_TF
+         *   set.
+         *
+         */
+        int is_excl = (prot == ATA_PROT_ATAPI ||
+                       prot == ATA_PROT_ATAPI_NODATA ||
+                       prot == ATA_PROT_ATAPI_DMA ||
+                       (qc->flags & ATA_QCFLAG_RESULT_TF));
+
         if (unlikely(ap->excl_link)) {
                 if (link == ap->excl_link) {
                         if (ap->nr_active_links)
@@ -849,7 +864,7 @@ static int sil24_qc_defer(struct ata_queued_cmd *qc)
                         qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
                 } else
                         return ATA_DEFER_PORT;
-        } else if (unlikely(is_atapi)) {
+        } else if (unlikely(is_excl)) {
                 ap->excl_link = link;
                 if (ap->nr_active_links)
                         return ATA_DEFER_PORT;