jz47xx: Audio path tweaks:

 * Increase audio buffer size to better handle IRQ latency (256->2048)
 * Ensure DMA engine is idle prior to starting transfers
 * Set AIC to repeat last sample in case of underflows

Change-Id: I9c45c20481ee072e5882b7586fb7d50bd8ef2f35

1 files changed, 2 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_jz47xx/pcm-jz4760.c b/firmware/target/mips/ingenic_jz47xx/pcm-jz4760.c
index 59b086e4f8..098c28ecf5 100644
--- a/firmware/target/mips/ingenic_jz47xx/pcm-jz4760.c
+++ b/firmware/target/mips/ingenic_jz47xx/pcm-jz4760.c
@@ -128,6 +128,8 @@ void DMA_CALLBACK(DMA_AIC_TX_CHANNEL)(void)
 
 void pcm_play_dma_start(const void *addr, size_t size)
 {
+    pcm_play_dma_stop();
+
     __dmac_channel_enable_clk(DMA_AIC_TX_CHANNEL);
 
     set_dma(addr, size);