diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
index 0d6a4de10f6c52c85d886f66a5df11469a0f2414..3d9759c3ccb50e94790721723069ef9812e0a144 100644
--- a/arch/loongarch/kernel/acpi.c
+++ b/arch/loongarch/kernel/acpi.c
@@ -165,6 +165,7 @@ static void __init acpi_process_madt(void)
 	acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC,
 			acpi_parse_eio_master, MAX_IO_PICS);
 
+	acpi_irq_model = ACPI_IRQ_MODEL_LPIC;
 	loongson_sysconf.nr_cpus = num_processors;
 }
 
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 14ee631cb7cf121b673829120bb221ee369d8b6f..0684ab9b8f623c7bfa06965bcb32b3cf0646b452 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -405,8 +405,14 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
 	 * controller and must therefore be considered active high
 	 * as default.
 	 */
+#ifdef CONFIG_LOONGARCH
+	int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ||
+			acpi_irq_model == ACPI_IRQ_MODEL_LPIC ?
+			ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW;
+#else
 	int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ?
 				      ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW;
+#endif
 	char *link = NULL;
 	char link_desc[16];
 	int rc;