From 473cfffa0c03dd0bb2a2f579fb0220f75423c61e Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <stenzek@gmail.com>
Date: Sun, 15 Nov 2020 21:54:07 +1000
Subject: [PATCH] GPU: Only accept DMA writes when FIFO is empty or command
 incomplete

Fixes a bunch of games, including Red Asphalt, Little Princess, Vampire
Hunter D main menu when combined with tight DMA sync.
---
 src/core/gpu.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/gpu.cpp b/src/core/gpu.cpp
index f02d9b0b6..a2fe8957b 100644
--- a/src/core/gpu.cpp
+++ b/src/core/gpu.cpp
@@ -246,7 +246,7 @@ void GPU::UpdateDMARequest()
   {
     case BlitterState::Idle:
       m_GPUSTAT.ready_to_send_vram = false;
-      m_GPUSTAT.ready_to_recieve_dma = (m_fifo.GetSize() < m_fifo_size);
+      m_GPUSTAT.ready_to_recieve_dma = (m_fifo.IsEmpty() || m_fifo.GetSize() < m_command_total_words);
       break;
 
     case BlitterState::WritingVRAM: