mos6522: remove additional interrupt flag filter from mos6522_update_irq()

The datasheet indicates that the interrupt is generated by ANDing the
interrupt flags register (IFR) with the interrupt enable register (IER)
but currently there is an extra filter for the SR and timer interrupts.

Remove this extra filter to allow interrupts to be generated by external
inputs on bits 1 and 2 of ports A and B.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/misc/mos6522.c b/hw/misc/mos6522.c
index ad5041d8c041d2e18a2f6031b88d27d0f954a974..8d5b419825cac66449ec0b54b474bf2c9425819e 100644 (file)
--- a/hw/misc/mos6522.c
+++ b/hw/misc/mos6522.c
@@ -40,7 +40,7 @@ static void mos6522_timer_update(MOS6522State *s, MOS6522Timer *ti,
 
 static void mos6522_update_irq(MOS6522State *s)
 {
-    if (s->ifr & s->ier & (SR_INT | T1_INT | T2_INT)) {
+    if (s->ifr & s->ier) {
         qemu_irq_raise(s->irq);
     } else {
         qemu_irq_lower(s->irq);