Sansa AMS: Disable DMA clocks when not in use

Add dma_retain() and dma_release() to reference count the users

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19344 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 4 insertions, 0 deletions

diff --git a/firmware/target/arm/as3525/pcm-as3525.c b/firmware/target/arm/as3525/pcm-as3525.c
index cf0333f24c..e5cbdc48ee 100644
--- a/firmware/target/arm/as3525/pcm-as3525.c
+++ b/firmware/target/arm/as3525/pcm-as3525.c
@@ -94,6 +94,8 @@ void pcm_play_dma_start(const void *addr, size_t size)
     dma_size = size;
     dma_start_addr = (unsigned char*)addr;
 
+    dma_retain();
+
     play_start_pcm();
 }
 
@@ -102,6 +104,8 @@ void pcm_play_dma_stop(void)
     dma_disable_channel(1);
     dma_size = 0;
 
+    dma_release();
+
     CGU_PERI &= ~CGU_I2SOUT_APB_CLOCK_ENABLE;
     CGU_AUDIO &= ~(1<<11);
 }