omap: DMA: Init CDAC to zero

The register DMA4_CDAC needs to be initialized to zero
before starting DMA transfer.

Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Govindraj R <govindraj.raja@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Reported-by:S, Venkatraman <svenkatr@ti.com>
Signed-off-by: Manjunatha GK <manjugk@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 2ab224c8e16c..f6c9bdc95bce 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -936,6 +936,15 @@ void omap_start_dma(int lch)
 {
         u32 l;
 
+        /*
+         * The CPC/CDAC register needs to be initialized to zero
+         * before starting dma transfer.
+         */
+        if (cpu_is_omap15xx())
+                dma_write(0, CPC(lch));
+        else
+                dma_write(0, CDAC(lch));
+
         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
                 int next_lch, cur_lch;
                 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];