From d5e60af439adecdcf4bede3acb48c30d95199c65 Mon Sep 17 00:00:00 2001
From: refraction <refraction@96395faa-99c1-11dd-bbfe-3dabce05a288>
Date: Mon, 29 Nov 2010 20:33:22 +0000
Subject: [PATCH] DMA: Disallow MADR/QWC/TADR writes while the DMA is busy,
 solves the Mana Khemia voodooness

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@4061 96395faa-99c1-11dd-bbfe-3dabce05a288
---
 pcsx2/ps2/LegacyDmac.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pcsx2/ps2/LegacyDmac.cpp b/pcsx2/ps2/LegacyDmac.cpp
index 51e1a1db70..d40f588aa6 100644
--- a/pcsx2/ps2/LegacyDmac.cpp
+++ b/pcsx2/ps2/LegacyDmac.cpp
@@ -413,6 +413,16 @@ __fi bool dmacWrite32( u32 mem, mem32_t& value )
 	}
 	}
 
+	//DMA Writes are invalid to everything except the STR on CHCR when it is busy
+	if((mem & 0xf0))
+	{	
+		if((psHu32(mem & ~0xff) & 0x100) && dmacRegs.ctrl.DMAE && !psHu8(DMAC_ENABLER+2)) 
+		{
+			DevCon.Warning("Write to DMA addr %x while STR is busy! Ignoring", mem);
+			return false;
+		}
+	}
+
 	// fall-through: use the default writeback provided by caller.
 	return true;
 }