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/ata_sd_as3525.c b/firmware/target/arm/as3525/ata_sd_as3525.c
index b71941adad..edde02b593 100644
--- a/firmware/target/arm/as3525/ata_sd_as3525.c
+++ b/firmware/target/arm/as3525/ata_sd_as3525.c
@@ -568,6 +568,8 @@ static int sd_transfer_sectors(IF_MV2(int drive,) unsigned long start,
         goto sd_transfer_error;
     }
 
+    dma_retain();
+
     while(count)
     {
         /* 128 * 512 = 2^16, and doesn't fit in the 16 bits of DATA_LENGTH
@@ -628,6 +630,8 @@ static int sd_transfer_sectors(IF_MV2(int drive,) unsigned long start,
 
     while (1)
     {
+        dma_release();
+
 #ifndef BOOTLOADER
         sd_enable(false);
 #endif