diff --git a/arch/loongarch/include/asm/setup.h b/arch/loongarch/include/asm/setup.h
index ee52fb1e99631653e3e40d6998afd159a7e5986d..eefb30c33ba33e1de9153676e8653d851bfa1c6c 100644
--- a/arch/loongarch/include/asm/setup.h
+++ b/arch/loongarch/include/asm/setup.h
@@ -12,6 +12,7 @@
 
 #define VECSIZE 0x200
 
+extern bool disable_pci_irq_limit;
 extern unsigned long eentry;
 extern unsigned long tlbrentry;
 extern char init_command_line[COMMAND_LINE_SIZE];
diff --git a/drivers/irqchip/irq-loongarch-avec.c b/drivers/irqchip/irq-loongarch-avec.c
index 5c9dcc488e21ee08a6a717753bd654053f88bd3c..b9202fdb6d925047f56ace77e415219a337c9f45 100644
--- a/drivers/irqchip/irq-loongarch-avec.c
+++ b/drivers/irqchip/irq-loongarch-avec.c
@@ -30,6 +30,7 @@ struct pending_list {
 	struct list_head	head;
 };
 
+bool disable_pci_irq_limit;
 static struct cpumask intersect_mask;
 static DEFINE_PER_CPU(struct pending_list, pending_list);
 #endif
@@ -83,7 +84,7 @@ static void avecintc_sync(struct avecintc_data *adata)
 		plist = per_cpu_ptr(&pending_list, adata->prev_cpu);
 		list_add_tail(&adata->entry, &plist->head);
 		adata->moving = 1;
-		smp_ops.send_ipi_single(adata->prev_cpu, SMP_CLEAR_VECTOR);
+		smp_ops.send_ipi_single(adata->prev_cpu, ACTION_CLEAR_VECTOR);
 	}
 }
 
@@ -132,6 +133,7 @@ static int avecintc_set_affinity(struct irq_data *data, const struct cpumask *de
 
 static int avecintc_cpu_online(unsigned int cpu)
 {
+	long value;
 	if (!loongarch_avec.vector_matrix)
 		return 0;
 
@@ -141,6 +143,10 @@ static int avecintc_cpu_online(unsigned int cpu)
 
 	pending_list_init(cpu);
 
+	value = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
+	value |= IOCSR_MISC_FUNC_AVEC_EN;
+	iocsr_write64(value, LOONGARCH_IOCSR_MISC_FUNC);
+
 	raw_spin_unlock(&loongarch_avec.lock);
 
 	return 0;
@@ -193,7 +199,7 @@ void complete_irq_moving(void)
 		}
 
 		if (isr & (1UL << (vector % VECTORS_PER_REG))) {
-			smp_ops.send_ipi_single(cpu, SMP_CLEAR_VECTOR);
+			smp_ops.send_ipi_single(cpu, ACTION_CLEAR_VECTOR);
 			continue;
 		}
 		list_del(&adata->entry);
@@ -365,6 +371,7 @@ static int __init avecintc_init(struct irq_domain *parent)
 	int ret, parent_irq;
 	unsigned long value;
 
+	disable_pci_irq_limit = true;
 	raw_spin_lock_init(&loongarch_avec.lock);
 
 	loongarch_avec.fwnode = irq_domain_alloc_named_fwnode("AVECINTC");
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index e6ac06d94fb592ec779d5e695c1958839a6ff0a6..3bd6b9d20b091152822027ad673d6715dcf37a2b 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -409,6 +409,8 @@ static int msi_capability_init(struct pci_dev *dev, int nvec,
 }
 
 #ifdef CONFIG_LOONGARCH
+#include <asm/setup.h>
+
 static unsigned int pci_irq_numbers = 32;
 
 static int __init pci_irq_limit(char *str)
@@ -430,9 +432,11 @@ int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 	int rc;
 
 #ifdef CONFIG_LOONGARCH
-	if (maxvec > 32) {
-		maxvec = pci_irq_numbers;
-		minvec = min_t(int, pci_irq_numbers, minvec);
+	if (!disable_pci_irq_limit) {
+		if (maxvec > 32) {
+			maxvec = pci_irq_numbers;
+			minvec = min_t(int, pci_irq_numbers, minvec);
+		}
 	}
 #endif
 
@@ -807,9 +811,11 @@ int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int
 	int hwsize, rc, nvec = maxvec;
 
 #ifdef CONFIG_LOONGARCH
-	if (maxvec > 32) {
-		nvec = pci_irq_numbers;
-		minvec = min_t(int, pci_irq_numbers, minvec);
+	if (!disable_pci_irq_limit) {
+		if (maxvec > 32) {
+			nvec = pci_irq_numbers;
+			minvec = min_t(int, pci_irq_numbers, minvec);
+		}
 	}
 #endif