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>
diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index b2a5372..6362ca0 100644
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -545,8 +545,13 @@
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;