From 155cf385bda43668ab3ebd7abf07940ed6047eef Mon Sep 17 00:00:00 2001
From: refractionpcsx2 <refraction@gmail.com>
Date: Fri, 18 Dec 2020 20:55:02 +0000
Subject: [PATCH] microVU: Flush running VU1 program when toggling MTVU on

---
 pcsx2/x86/microVU.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/pcsx2/x86/microVU.cpp b/pcsx2/x86/microVU.cpp
index bc1ff0b8b9..e2d9cee3e8 100644
--- a/pcsx2/x86/microVU.cpp
+++ b/pcsx2/x86/microVU.cpp
@@ -73,7 +73,15 @@ void mVUinit(microVU& mVU, uint vuIndex) {
 
 // Resets Rec Data
 void mVUreset(microVU& mVU, bool resetReserve) {
-
+	if (THREAD_VU1)
+	{
+		// If MTVU is toggled on during gameplay we need to flush the running VU1 program, else it gets in a mess
+		if (VU0.VI[REG_VPU_STAT].UL & 0x100)
+		{
+			CpuVU1->Execute(vu1RunCycles);
+		}
+		VU0.VI[REG_VPU_STAT].UL &= ~0x100;
+	}
 	// Restore reserve to uncommitted state
 	if (resetReserve) mVU.cache_reserve->Reset();