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, 6 insertions, 1 deletions

diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index b2a5372ef72c..6362ca05506e 100644
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -545,8 +545,13 @@ static int davinci_i2s_probe(struct platform_device *pdev)
                 ret = -ENOMEM;
                 goto err_release_region;
         }
-        if (pdata)
+        if (pdata) {
                 dev->enable_channel_combine = pdata->enable_channel_combine;
+                dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].sram_size =
+                        pdata->sram_size_playback;
+                dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].sram_size =
+                        pdata->sram_size_capture;
+        }
         dev->clk = clk_get(&pdev->dev, NULL);
         if (IS_ERR(dev->clk)) {
                 ret = -ENODEV;