If the DMA destination position has been asked before the
first actual data transfer has been done, the CDAC
register still contains 0 (it is initialized to 0 at
omsp_dma_start).
If CDAC == 0, return the programmed start address.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
arch/arm/plat-omap/dma.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 38b0d44..9186491 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -1066,8 +1066,16 @@ dma_addr_t omap_get_dma_dst_pos(int lch)
if (cpu_is_omap15xx())
offset = p->dma_read(CPC, lch);
- else
+ else {
offset = p->dma_read(CDAC, lch);
+ /*
+ * CDAC == 0 indicates that the DMA transfer on the channel has
+ * not been started (no data has been transferred so far).
+ * Return the programmed destination start address in this case.
+ */
+ if (unlikely(!offset))
+ offset = p->dma_read(CDSA, lch);
+ }
/*
* omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
--
1.7.7.1
--
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