diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 138bdd6..b29504f 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -713,12 +713,11 @@ static void pci_bridge_check_ranges(struct pci_bus *bus)
    bus resource of a given type. Note: we intentionally skip
    the bus resources which have already been assigned (that is,
    have non-NULL parent resource). */
-static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
+static struct resource *find_free_bus_resource(struct pci_bus *bus,
+			 unsigned long type_mask, unsigned long type)
 {
 	int i;
 	struct resource *r;
-	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
-				  IORESOURCE_PREFETCH;
 
 	pci_bus_for_each_resource(bus, r, i) {
 		if (r == &ioport_resource || r == &iomem_resource)
@@ -815,7 +814,8 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
 		resource_size_t add_size, struct list_head *realloc_head)
 {
 	struct pci_dev *dev;
-	struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
+	struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO,
+							IORESOURCE_IO);
 	resource_size_t size = 0, size0 = 0, size1 = 0;
 	resource_size_t children_add_size = 0;
 	resource_size_t min_align, align;
@@ -915,15 +915,17 @@ static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
  * guarantees that all child resources fit in this size.
  */
 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
-			 unsigned long type, resource_size_t min_size,
-			resource_size_t add_size,
-			struct list_head *realloc_head)
+			 unsigned long type, unsigned long type2,
+			 unsigned long type3,
+			 resource_size_t min_size, resource_size_t add_size,
+			 struct list_head *realloc_head)
 {
 	struct pci_dev *dev;
 	resource_size_t min_align, align, size, size0, size1;
 	resource_size_t aligns[12];	/* Alignments from 1Mb to 2Gb */
 	int order, max_order;
-	struct resource *b_res = find_free_bus_resource(bus, type);
+	struct resource *b_res = find_free_bus_resource(bus,
+					 mask | IORESOURCE_PREFETCH, type);
 	unsigned int mem64_mask = 0;
 	resource_size_t children_add_size = 0;
 
@@ -944,7 +946,9 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			struct resource *r = &dev->resource[i];
 			resource_size_t r_size;
 
-			if (r->parent || (r->flags & mask) != type)
+			if (r->parent || ((r->flags & mask) != type &&
+					  (r->flags & mask) != type2 &&
+					  (r->flags & mask) != type3))
 				continue;
 			r_size = resource_size(r);
 #ifdef CONFIG_PCI_IOV
@@ -1117,8 +1121,9 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus,
 			struct list_head *realloc_head)
 {
 	struct pci_dev *dev;
-	unsigned long mask, prefmask;
+	unsigned long mask, prefmask, type2 = 0, type3 = 0;
 	resource_size_t additional_mem_size = 0, additional_io_size = 0;
+	struct resource *b_res;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *b = dev->subordinate;
@@ -1163,15 +1168,34 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus,
 		   has already been allocated by arch code, try
 		   non-prefetchable range for both types of PCI memory
 		   resources. */
+		b_res = &bus->self->resource[PCI_BRIDGE_RESOURCES];
 		mask = IORESOURCE_MEM;
 		prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
-		if (pbus_size_mem(bus, prefmask, prefmask,
+		if (b_res[2].flags & IORESOURCE_MEM_64) {
+			prefmask |= IORESOURCE_MEM_64;
+			if (pbus_size_mem(bus, prefmask, prefmask,
+				  prefmask, prefmask,
 				  realloc_head ? 0 : additional_mem_size,
-				  additional_mem_size, realloc_head))
-			mask = prefmask; /* Success, size non-prefetch only. */
-		else
-			additional_mem_size += additional_mem_size;
-		pbus_size_mem(bus, mask, IORESOURCE_MEM,
+				  additional_mem_size, realloc_head)) {
+					/* Success, size non-pref64 only. */
+					mask = prefmask;
+					type2 = prefmask & ~IORESOURCE_MEM_64;
+					type3 = prefmask & ~IORESOURCE_PREFETCH;
+			}
+		}
+		if (!type2) {
+			prefmask &= ~IORESOURCE_MEM_64;
+			if (pbus_size_mem(bus, prefmask, prefmask,
+					 prefmask, prefmask,
+					 realloc_head ? 0 : additional_mem_size,
+					 additional_mem_size, realloc_head)) {
+				/* Success, size non-prefetch only. */
+				mask = prefmask;
+			} else
+				additional_mem_size += additional_mem_size;
+			type2 = type3 = IORESOURCE_MEM;
+		}
+		pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3,
 				realloc_head ? 0 : additional_mem_size,
 				additional_mem_size, realloc_head);
 		break;
@@ -1257,42 +1281,66 @@ static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
 static void pci_bridge_release_resources(struct pci_bus *bus,
 					  unsigned long type)
 {
-	int idx;
-	bool changed = false;
-	struct pci_dev *dev;
+	struct pci_dev *dev = bus->self;
 	struct resource *r;
 	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
-				  IORESOURCE_PREFETCH;
+				  IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
+	unsigned old_flags = 0;
+	struct resource *b_res;
+	int idx = 1;
 
-	dev = bus->self;
-	for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
-	     idx++) {
-		r = &dev->resource[idx];
-		if ((r->flags & type_mask) != type)
-			continue;
-		if (!r->parent)
-			continue;
-		/*
-		 * if there are children under that, we should release them
-		 *  all
-		 */
-		release_child_resources(r);
-		if (!release_resource(r)) {
-			dev_printk(KERN_DEBUG, &dev->dev,
-				 "resource %d %pR released\n", idx, r);
-			/* keep the old size */
-			r->end = resource_size(r) - 1;
-			r->start = 0;
-			r->flags = 0;
-			changed = true;
-		}
-	}
+	b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
+
+	/*
+	 *     1. if there is io port assign fail, will release bridge
+	 *	  io port.
+	 *     2. if there is non pref mmio assign fail, release bridge
+	 *	  nonpref mmio.
+	 *     3. if there is 64bit pref mmio assign fail, and bridge pref
+	 *	  is 64bit, release bridge pref mmio.
+	 *     4. if there is pref mmio assign fail, and bridge pref is
+	 *	  32bit mmio, release bridge pref mmio
+	 *     5. if there is pref mmio assign fail, and bridge pref is not
+	 *	  assigned, release bridge nonpref mmio.
+	 */
+	if (type & IORESOURCE_IO)
+		idx = 0;
+	else if (!(type & IORESOURCE_PREFETCH))
+		idx = 1;
+	else if ((type & IORESOURCE_MEM_64) &&
+		 (b_res[2].flags & IORESOURCE_MEM_64))
+		idx = 2;
+	else if (!(b_res[2].flags & IORESOURCE_MEM_64) &&
+		 (b_res[2].flags & IORESOURCE_PREFETCH))
+		idx = 2;
+	else
+		idx = 1;
+
+	r = &b_res[idx];
+
+	if (!r->parent)
+		return;
+
+	/*
+	 * if there are children under that, we should release them
+	 *  all
+	 */
+	release_child_resources(r);
+	if (!release_resource(r)) {
+		type = old_flags = r->flags & type_mask;
+		dev_printk(KERN_DEBUG, &dev->dev, "resource %d %pR released\n",
+					PCI_BRIDGE_RESOURCES + idx, r);
+		/* keep the old size */
+		r->end = resource_size(r) - 1;
+		r->start = 0;
+		r->flags = 0;
 
-	if (changed) {
 		/* avoiding touch the one without PREF */
 		if (type & IORESOURCE_PREFETCH)
 			type = IORESOURCE_PREFETCH;
 		__pci_setup_bridge(bus, type);
+		/* for next child res under same bridge */
+		r->flags = old_flags;
 	}
 }
 
@@ -1471,7 +1519,7 @@ void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
 	LIST_HEAD(fail_head);
 	struct pci_dev_resource *fail_res;
 	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
-				  IORESOURCE_PREFETCH;
+				  IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
 	int pci_try_num = 1;
 	enum enable_type enable_local;
 
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 5c060b1..2c659e4 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -208,15 +208,31 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
 
 	/* First, try exact prefetching match.. */
 	ret = pci_bus_alloc_resource(bus, res, size, align, min,
-				     IORESOURCE_PREFETCH,
+				     IORESOURCE_PREFETCH | IORESOURCE_MEM_64,
 				     pcibios_align_resource, dev);
 
-	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
+	if (ret < 0 &&
+	    (res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) ==
+	     (IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) {
+		/*
+		 * That failed.
+		 *
+		 * Try below 4g pref
+		 */
+		ret = pci_bus_alloc_resource(bus, res, size, align, min,
+					     IORESOURCE_PREFETCH,
+					     pcibios_align_resource, dev);
+	}
+
+	if (ret < 0 &&
+	    (res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64))) {
 		/*
 		 * That failed.
 		 *
 		 * But a prefetching area can handle a non-prefetching
 		 * window (it will just not perform as well).
+		 *
+		 * Also can put 64bit under 32bit range. (below 4g).
 		 */
 		ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 					     pcibios_align_resource, dev);
