ASoC: DaVinci: pcm, fix underrun by using sram

Fix underruns by using dma to copy 1st to sram
in a ping/pong buffer style and then copying from
the sram to the ASP. This also has the advantage
of tolerating very long interrupt latency on dma
completion.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/include/mach/asp.h b/arch/arm/mach-davinci/include/mach/asp.h
index 019c6473341..e07f70ed7c5 100644
--- a/arch/arm/mach-davinci/include/mach/asp.h
+++ b/arch/arm/mach-davinci/include/mach/asp.h
@@ -57,6 +57,8 @@ struct snd_platform_data {
          * when compared to previous behavior.
          */
         unsigned enable_channel_combine:1;
+        unsigned sram_size_playback;
+        unsigned sram_size_capture;
 
         /* McASP specific fields */
         int tdm_slots;