61 lines
2.2 KiB
Diff
61 lines
2.2 KiB
Diff
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From e85ad9182c962bb095beb435e98fde612a4ef88d Mon Sep 17 00:00:00 2001
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From: Joel Fernandes <joelf@ti.com>
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Date: Wed, 3 Jul 2013 17:29:44 -0500
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Subject: [PATCH 11/13] sound: soc: soc-dmaengine-pcm: Add support for new
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DMAEngine request API
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Formerly these resources were coming HWMOD on OMAP-like SoCs. With the
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impending removal of HWMOD data, drivers are being converted to use the
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"of-dma" method of requesting DMA channels which from DT and can be obtained
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using the dma_request_slave_channel API. Add support to the soc-dmaengine-pcm
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helpers so that we can fetch and open channels using this method.
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Signed-off-by: Joel Fernandes <joelf@ti.com>
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---
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sound/soc/soc-dmaengine-pcm.c | 22 ++++++++++++++++++++++
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1 file changed, 22 insertions(+)
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diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c
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index aa924d9..461fe4f 100644
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--- a/sound/soc/soc-dmaengine-pcm.c
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+++ b/sound/soc/soc-dmaengine-pcm.c
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@@ -276,6 +276,16 @@ struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
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}
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel);
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+struct dma_chan *snd_dmaengine_pcm_request_slave_channel(
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+ struct snd_pcm_substream *substream, char *name)
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+{
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+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+ struct device *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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+
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+ return dma_request_slave_channel(dev, name);
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+}
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+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_slave_channel);
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+
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/**
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* snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
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* @substream: PCM substream
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@@ -334,6 +344,18 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
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}
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
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+int snd_dmaengine_pcm_open_request_slave_chan(struct snd_pcm_substream *substream, char *name)
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+{
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+ if(substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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+ return snd_dmaengine_pcm_open(substream,
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+ snd_dmaengine_pcm_request_slave_channel(substream, "tx"));
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+ } else {
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+ return snd_dmaengine_pcm_open(substream,
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+ snd_dmaengine_pcm_request_slave_channel(substream, "rx"));
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+ }
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+}
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+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_slave_chan);
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+
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/**
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* snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
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* @substream: PCM substream
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--
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1.8.2.1
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