1 files changed, 27 insertions, 73 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index ed9b407e42d4..54f38c21dd95 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -193,6 +193,8 @@ enum {
                                           ATA_FLAG_ACPI_SATA | ATA_FLAG_AN |
                                           ATA_FLAG_IPM,
         AHCI_LFLAG_COMMON               = ATA_LFLAG_SKIP_D2H_BSY,
+
+        ICH_MAP                         = 0x90, /* ICH MAP register */
 };
 
 struct ahci_cmd_hdr {
@@ -536,6 +538,10 @@ static const struct pci_device_id ahci_pci_tbl[] = {
         { PCI_VDEVICE(NVIDIA, 0x0ad9), board_ahci },            /* MCP77 */
         { PCI_VDEVICE(NVIDIA, 0x0ada), board_ahci },            /* MCP77 */
         { PCI_VDEVICE(NVIDIA, 0x0adb), board_ahci },            /* MCP77 */
+        { PCI_VDEVICE(NVIDIA, 0x0ab4), board_ahci },            /* MCP79 */
+        { PCI_VDEVICE(NVIDIA, 0x0ab5), board_ahci },            /* MCP79 */
+        { PCI_VDEVICE(NVIDIA, 0x0ab6), board_ahci },            /* MCP79 */
+        { PCI_VDEVICE(NVIDIA, 0x0ab7), board_ahci },            /* MCP79 */
         { PCI_VDEVICE(NVIDIA, 0x0ab8), board_ahci },            /* MCP79 */
         { PCI_VDEVICE(NVIDIA, 0x0ab9), board_ahci },            /* MCP79 */
         { PCI_VDEVICE(NVIDIA, 0x0aba), board_ahci },            /* MCP79 */
@@ -1267,9 +1273,9 @@ static int ahci_do_softreset(struct ata_link *link, unsigned int *class,
 
         /* prepare for SRST (AHCI-1.1 10.4.1) */
         rc = ahci_kick_engine(ap, 1);
-        if (rc)
+        if (rc && rc != -EOPNOTSUPP)
                 ata_link_printk(link, KERN_WARNING,
-                                "failed to reset engine (errno=%d)", rc);
+                                "failed to reset engine (errno=%d)\n", rc);
 
         ata_tf_init(link->device, &tf);
 
@@ -1634,7 +1640,7 @@ static void ahci_port_intr(struct ata_port *ap)
         struct ahci_host_priv *hpriv = ap->host->private_data;
         int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
         u32 status, qc_active;
-        int rc, known_irq = 0;
+        int rc;
 
         status = readl(port_mmio + PORT_IRQ_STAT);
         writel(status, port_mmio + PORT_IRQ_STAT);
@@ -1692,80 +1698,12 @@ static void ahci_port_intr(struct ata_port *ap)
 
         rc = ata_qc_complete_multiple(ap, qc_active, NULL);
 
-        /* If resetting, spurious or invalid completions are expected,
-         * return unconditionally.
-         */
-        if (resetting)
-                return;
-
-        if (rc > 0)
-                return;
-        if (rc < 0) {
+        /* while resetting, invalid completions are expected */
+        if (unlikely(rc < 0 && !resetting)) {
                 ehi->err_mask |= AC_ERR_HSM;
                 ehi->action |= ATA_EH_SOFTRESET;
                 ata_port_freeze(ap);
-                return;
         }
-
-        /* hmmm... a spurious interrupt */
-
-        /* if !NCQ, ignore.  No modern ATA device has broken HSM
-         * implementation for non-NCQ commands.
-         */
-        if (!ap->link.sactive)
-                return;
-
-        if (status & PORT_IRQ_D2H_REG_FIS) {
-                if (!pp->ncq_saw_d2h)
-                        ata_port_printk(ap, KERN_INFO,
-                                "D2H reg with I during NCQ, "
-                                "this message won't be printed again\n");
-                pp->ncq_saw_d2h = 1;
-                known_irq = 1;
-        }
-
-        if (status & PORT_IRQ_DMAS_FIS) {
-                if (!pp->ncq_saw_dmas)
-                        ata_port_printk(ap, KERN_INFO,
-                                "DMAS FIS during NCQ, "
-                                "this message won't be printed again\n");
-                pp->ncq_saw_dmas = 1;
-                known_irq = 1;
-        }
-
-        if (status & PORT_IRQ_SDB_FIS) {
-                const __le32 *f = pp->rx_fis + RX_FIS_SDB;
-
-                if (le32_to_cpu(f[1])) {
-                        /* SDB FIS containing spurious completions
-                         * might be dangerous, whine and fail commands
-                         * with HSM violation.  EH will turn off NCQ
-                         * after several such failures.
-                         */
-                        ata_ehi_push_desc(ehi,
-                                "spurious completions during NCQ "
-                                "issue=0x%x SAct=0x%x FIS=%08x:%08x",
-                                readl(port_mmio + PORT_CMD_ISSUE),
-                                readl(port_mmio + PORT_SCR_ACT),
-                                le32_to_cpu(f[0]), le32_to_cpu(f[1]));
-                        ehi->err_mask |= AC_ERR_HSM;
-                        ehi->action |= ATA_EH_SOFTRESET;
-                        ata_port_freeze(ap);
-                } else {
-                        if (!pp->ncq_saw_sdb)
-                                ata_port_printk(ap, KERN_INFO,
-                                        "spurious SDB FIS %08x:%08x during NCQ, "
-                                        "this message won't be printed again\n",
-                                        le32_to_cpu(f[0]), le32_to_cpu(f[1]));
-                        pp->ncq_saw_sdb = 1;
-                }
-                known_irq = 1;
-        }
-
-        if (!known_irq)
-                ata_port_printk(ap, KERN_INFO, "spurious interrupt "
-                                "(irq_stat 0x%x active_tag 0x%x sactive 0x%x)\n",
-                                status, ap->link.active_tag, ap->link.sactive);
 }
 
 static void ahci_irq_clear(struct ata_port *ap)
@@ -2269,6 +2207,22 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         if (rc)
                 return rc;
 
+        if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
+            (pdev->device == 0x2652 || pdev->device == 0x2653)) {
+                u8 map;
+
+                /* ICH6s share the same PCI ID for both piix and ahci
+                 * modes.  Enabling ahci mode while MAP indicates
+                 * combined mode is a bad idea.  Yield to ata_piix.
+                 */
+                pci_read_config_byte(pdev, ICH_MAP, &map);
+                if (map & 0x3) {
+                        dev_printk(KERN_INFO, &pdev->dev, "controller is in "
+                                   "combined mode, can't enable AHCI mode\n");
+                        return -ENODEV;
+                }
+        }
+
         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
         if (!hpriv)
                 return -ENOMEM;