Add optional DMA usage on flipbuf

This will copy an entire row of tiles instead of per tile copy, but for
applications that clear the screen on each frame it will be more
efficient.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/common.h b/src/common.h
index e62c78c..1fbfa4c 100644
--- a/src/common.h
+++ b/src/common.h
@@ -419,12 +419,16 @@ dma_transfer_fill(void *dst, volatile u32 src, u32 count, int channel, u32 optio
 inline void
 dma_copy(void *dst, const void *src, u32 size, int channel) {
     dma_transfer_copy(dst, src, size / 4, channel, DMA_CHUNK_32 | DMA_ENABLE);
+    // Stall for 2 cycles in case we call this function more than once.
+    asm("nop"); asm("nop");
 }
 
 // Fill the dst location with the word set at src.
 inline void
 dma_fill(void *dst, vu32 src, u32 size, int channel) {
     dma_transfer_fill(dst, src, size / 4, channel, DMA_CHUNK_32 | DMA_ENABLE);
+    // Stall for 2 cycles in case we call this function more than once.
+    asm("nop"); asm("nop");
 }
 
 //