From fdaccc16f1b606076b8d8e8cf33fe6b85ed2323b Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Fri, 2 Jul 2021 03:29:45 -0700
Subject: [PATCH] DS: Lengthen CPU timeslices if the ARM7 is halted

---
 src/ds/ds.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ds/ds.c b/src/ds/ds.c
index ab38cd06b..98856d31e 100644
--- a/src/ds/ds.c
+++ b/src/ds/ds.c
@@ -73,6 +73,10 @@ static void _slice(struct mTiming* timing, void* context, uint32_t cyclesLate) {
 	} else {
 		ds->activeCpu = ds->ds9.cpu;
 		ds->cycleDrift -= cycles << 1;
+		int32_t nextEvent = mTimingNextEvent(&ds->ds7.timing) << 1;
+		if (!ds->ds7.cpu->halted || nextEvent < SLICE_CYCLES) {
+			nextEvent = SLICE_CYCLES;
+		}
 		cycles = ds->cycleDrift + SLICE_CYCLES;
 		timing = &ds->ds9.timing;
 	}