1 files changed, 23 insertions, 73 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 4688dbf2d11..54f38c21dd9 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 {
@@ -1271,9 +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);
 
@@ -1638,7 +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);
@@ -1696,80 +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)
@@ -2273,6 +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;