From 0fd8a13a93bcef754fbf64ad6506c96228b69a16 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Fri, 21 Oct 2022 05:12:52 -0300
Subject: [PATCH] fix: don't start HDMA in vblank

---
 src/ppu.zig | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ppu.zig b/src/ppu.zig
index c89f5a1..725142a 100644
--- a/src/ppu.zig
+++ b/src/ppu.zig
@@ -569,7 +569,9 @@ pub const Ppu = struct {
         }
 
         // See if HBlank DMA is present and not enabled
-        pollBlankingDma(&cpu.bus, .HBlank);
+
+        if (!self.dispstat.vblank.read())
+            pollBlankingDma(&cpu.bus, .HBlank);
 
         self.dispstat.hblank.set();
         self.sched.push(.HBlank, 68 * 4 -| late);