--- zzzz-none-000/linux-3.10.107/drivers/ata/libata-core.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/drivers/ata/libata-core.c	2021-11-10 11:53:55.000000000 +0000
@@ -40,6 +40,13 @@
  *
  */
 
+/**
+ * Some part of this file is modified by Ikanos Communications. 
+ *
+ * Copyright (C) 2013-2014 Ikanos Communications.
+ */ 
+ 
+
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
@@ -72,6 +79,11 @@
 #include "libata.h"
 #include "libata-transport.h"
 
+#if (defined(CONFIG_FUSIV_VX185) || defined(CONFIG_FUSIV_VX585))&& defined(CONFIG_CPU_MIPSR2_IRQ_VI)
+#include <asm/mach-fusiv/vx185_int.h>
+fusiv_irq_params_t	ahci_fusiv_irq;
+#endif
+
 /* debounce timing parameters in msecs { interval, duration, timeout } */
 const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
 const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
@@ -4763,10 +4775,6 @@
  *	ata_qc_new - Request an available ATA command, for queueing
  *	@ap: target port
  *
- *	Some ATA host controllers may implement a queue depth which is less
- *	than ATA_MAX_QUEUE. So we shouldn't allocate a tag which is beyond
- *	the hardware limitation.
- *
  *	LOCKING:
  *	None.
  */
@@ -4774,17 +4782,16 @@
 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
 {
 	struct ata_queued_cmd *qc = NULL;
-	unsigned int max_queue = ap->host->n_tags;
 	unsigned int i, tag;
 
 	/* no command while frozen */
 	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
 		return NULL;
 
-	for (i = 0, tag = ap->last_tag + 1; i < max_queue; i++, tag++) {
-		tag = tag < max_queue ? tag : 0;
+	for (i = 0; i < ATA_MAX_QUEUE; i++) {
+		tag = (i + ap->last_tag + 1) % ATA_MAX_QUEUE;
 
-		/* the last tag is reserved for internal command. */
+	/* the last tag is reserved for internal command. */
 		if (tag == ATA_TAG_INTERNAL)
 			continue;
 
@@ -6083,7 +6090,6 @@
 {
 	spin_lock_init(&host->lock);
 	mutex_init(&host->eh_mutex);
-	host->n_tags = ATA_MAX_QUEUE - 1;
 	host->dev = dev;
 	host->ops = ops;
 }
@@ -6165,8 +6171,6 @@
 {
 	int i, rc;
 
-	host->n_tags = clamp(sht->can_queue, 1, ATA_MAX_QUEUE - 1);
-
 	/* host must have been started */
 	if (!(host->flags & ATA_HOST_STARTED)) {
 		dev_err(host->dev, "BUG: trying to register unstarted host\n");
@@ -6283,8 +6287,15 @@
 		return ata_host_register(host, sht);
 	}
 
+#if defined(CONFIG_FUSIV_VX185) 
+	ahci_fusiv_irq.ipc_src	=	SATA_INT;
+	ahci_fusiv_irq.priv	=	(void *)host;
+	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
+			      dev_driver_string(host->dev), &ahci_fusiv_irq);
+#else
 	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
 			      dev_driver_string(host->dev), host);
+#endif
 	if (rc)
 		return rc;