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, 1 insertions, 0 deletions

diff --git a/sound/soc/davinci/davinci-pcm.h b/sound/soc/davinci/davinci-pcm.h
index c8b0d2baf05a..0764944cf10f 100644
--- a/sound/soc/davinci/davinci-pcm.h
+++ b/sound/soc/davinci/davinci-pcm.h
@@ -20,6 +20,7 @@ struct davinci_pcm_dma_params {
         int channel;                    /* sync dma channel ID */
         unsigned short acnt;
         dma_addr_t dma_addr;            /* device physical address for DMA */
+        unsigned sram_size;
         enum dma_event_q eventq_no;     /* event queue number */
         unsigned char data_type;        /* xfer data type */
         unsigned char convert_mono_stereo;