ASoC: omap-pcm: Request the DMA channel differently when DT is involved

When booting with DT the platform_get_resource_byname() is not available to
get the DMA resource. In this case the DAI drivers will set the filter_data to
the name of the DMA and omap-pcm can use this to request the DMA channel.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 14 insertions, 3 deletions

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index c28e042f2208..a11405de86e8 100644
--- a/sound/soc/omap/omap-pcm.c
+++ b/sound/soc/omap/omap-pcm.c
@@ -113,14 +113,25 @@ static int omap_pcm_open(struct snd_pcm_substream *substream)
 {
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
         struct snd_dmaengine_dai_dma_data *dma_data;
+        int ret;
 
         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 
         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 
-        return snd_dmaengine_pcm_open_request_chan(substream,
-                                                   omap_dma_filter_fn,
-                                                   dma_data->filter_data);
+        /* DT boot: filter_data is the DMA name */
+        if (rtd->cpu_dai->dev->of_node) {
+                struct dma_chan *chan;
+
+                chan = dma_request_slave_channel(rtd->cpu_dai->dev,
+                                                 dma_data->filter_data);
+                ret = snd_dmaengine_pcm_open(substream, chan);
+        } else {
+                ret = snd_dmaengine_pcm_open_request_chan(substream,
+                                                          omap_dma_filter_fn,
+                                                          dma_data->filter_data);
+        }
+        return ret;
 }
 
 static int omap_pcm_mmap(struct snd_pcm_substream *substream,