From fc4803bdc2c9840a007c60e422fb0531107b80f2 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Thu, 5 Feb 2015 02:36:58 +0200
Subject: [PATCH] dma: some timing hacks

untested
---
 libpcsxcore/cdrom.c  |  5 ++++-
 libpcsxcore/mdec.c   | 12 +++++-------
 libpcsxcore/psxdma.c |  9 ++++++---
 3 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/libpcsxcore/cdrom.c b/libpcsxcore/cdrom.c
index 2e6277b8..556b512f 100644
--- a/libpcsxcore/cdrom.c
+++ b/libpcsxcore/cdrom.c
@@ -1418,7 +1418,10 @@ void psxDma3(u32 madr, u32 bcr, u32 chcr) {
 				CDRDMA_INT( (cdsize/4) / 4 );
 			}
 			else if( chcr == 0x11000000 ) {
-				CDRDMA_INT( (cdsize/4) * 1 );
+				// CDRDMA_INT( (cdsize/4) * 1 );
+				// halted
+				psxRegs.cycle += (cdsize/4) * 24/2;
+				CDRDMA_INT(16);
 			}
 			return;
 
diff --git a/libpcsxcore/mdec.c b/libpcsxcore/mdec.c
index bed4e53b..d6c7ab68 100644
--- a/libpcsxcore/mdec.c
+++ b/libpcsxcore/mdec.c
@@ -32,7 +32,7 @@
  * 320x240x16@60Hz => 9.216 MB/s
  * so 2.0 to 4.0 should be fine.
  */
-#define MDEC_BIAS 2.0f
+#define MDEC_BIAS 2
 
 #define DSIZE			8
 #define DSIZE2			(DSIZE * DSIZE)
@@ -545,15 +545,13 @@ void psxDma1(u32 adr, u32 bcr, u32 chcr) {
 	int blk[DSIZE2 * 6];
 	u8 * image;
 	int size;
-	int dmacnt;
+	u32 words;
 
 	if (chcr != 0x01000200) return;
 
-	size = (bcr >> 16) * (bcr & 0xffff);
+	words = (bcr >> 16) * (bcr & 0xffff);
 	/* size in byte */
-	size *= 4;
-	/* I guess the memory speed is limitating */
-	dmacnt = size;
+	size = words * 4;
 
 	if (!(mdec.reg1 & MDEC1_BUSY)) {
 		/* add to pending */
@@ -625,7 +623,7 @@ void psxDma1(u32 adr, u32 bcr, u32 chcr) {
 	}
 	
 	/* define the power of mdec */
-	MDECOUTDMA_INT((int) ((dmacnt* MDEC_BIAS)));
+	MDECOUTDMA_INT(words * MDEC_BIAS);
 	}
 }
 
diff --git a/libpcsxcore/psxdma.c b/libpcsxcore/psxdma.c
index b0f3fba4..03ee5639 100644
--- a/libpcsxcore/psxdma.c
+++ b/libpcsxcore/psxdma.c
@@ -220,7 +220,7 @@ void gpuInterrupt() {
 }
 
 void psxDma6(u32 madr, u32 bcr, u32 chcr) {
-	u32 size;
+	u32 words;
 	u32 *mem = (u32 *)PSXM(madr);
 
 #ifdef PSXDMA_LOG
@@ -238,7 +238,7 @@ void psxDma6(u32 madr, u32 bcr, u32 chcr) {
 		}
 
 		// already 32-bit size
-		size = bcr;
+		words = bcr;
 
 		while (bcr--) {
 			*mem-- = SWAP32((madr - 4) & 0xffffff);
@@ -246,7 +246,10 @@ void psxDma6(u32 madr, u32 bcr, u32 chcr) {
 		}
 		mem++; *mem = 0xffffff;
 
-		GPUOTCDMA_INT(size);
+		//GPUOTCDMA_INT(size);
+		// halted
+		psxRegs.cycle += words;
+		GPUOTCDMA_INT(16);
 		return;
 	}
 #ifdef PSXDMA_LOG
-- 
2.39.5