diff --git a/hw/intc/loongarch_pch_pic.c b/hw/intc/loongarch_pch_pic.c
index 9208fc4..6aa4cad 100644
--- a/hw/intc/loongarch_pch_pic.c
+++ b/hw/intc/loongarch_pch_pic.c
@@ -30,7 +30,11 @@
             qemu_set_irq(s->parent_irq[s->htmsi_vector[irq]], 1);
         }
     } else {
-        val = mask & s->intisr;
+        /*
+         * intirr means requested pending irq
+         * do not clear pending irq for edge-triggered on lowering edge
+         */
+        val = mask & s->intisr & ~s->intirr;
         if (val) {
             irq = ctz64(val);
             s->intisr &= ~MAKE_64BIT_MASK(irq, 1);
@@ -51,6 +55,7 @@
         /* Edge triggered */
         if (level) {
             if ((s->last_intirr & mask) == 0) {
+                /* marked pending on a rising edge */
                 s->intirr |= mask;
             }
             s->last_intirr |= mask;