[PATCH 04/28] omap: DMA: Init CDAC to zero

[Tony Lindgren]

From: manjugk manjugk <manjugk at ti.com>

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

Cc: Santosh Shilimkar <santosh.shilimkar at ti.com>
Cc: Govindraj R <govindraj.raja at ti.com>
Cc: Kevin Hilman <khilman at deeprootsystems.com>
Reported-by:S, Venkatraman <svenkatr at ti.com>
Signed-off-by: Manjunatha GK <manjugk at ti.com>
Signed-off-by: Tony Lindgren <tony at atomide.com>
---
 arch/arm/plat-omap/dma.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 2ab224c..f6c9bdc 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];