ASoC: rsnd: add nolock_start/stop callback

Current Renesas Sound driver requests DMA channel when .probe timing,
and release it when .remove timing. And use DMA on .start/.stop
But, Audio DMAC power ON was handled when request timing (= .probe),
and power OFF was when release timing (= .remove).
This means Audio DMAC power is always ON during driver was enabled.
To fixup this issue, it should request/release DMA channel on each
playback/recorde timing.
But, DMA channel request/release function uses mutex lock inside.
This means it will breaks current spinlock's interrupt protect.
To solve this issue, DMA channel request/release function needs to
be called from non-spinlock area. This patch adds its callback.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index ea14a1470de2..9ffa29941ceb 100644
--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -716,7 +716,33 @@ static int rsnd_soc_set_dai_tdm_slot(struct snd_soc_dai *dai,
 	return 0;
 }
 
+static int rsnd_soc_dai_startup(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
+	struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);
+
+	/*
+	 * call rsnd_dai_call without spinlock
+	 */
+	return rsnd_dai_call(nolock_start, io, priv);
+}
+
+static void rsnd_soc_dai_shutdown(struct snd_pcm_substream *substream,
+				  struct snd_soc_dai *dai)
+{
+	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
+	struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);
+
+	/*
+	 * call rsnd_dai_call without spinlock
+	 */
+	rsnd_dai_call(nolock_stop, io, priv);
+}
+
 static const struct snd_soc_dai_ops rsnd_soc_dai_ops = {
+	.startup	= rsnd_soc_dai_startup,
+	.shutdown	= rsnd_soc_dai_shutdown,
 	.trigger	= rsnd_soc_dai_trigger,
 	.set_fmt	= rsnd_soc_dai_set_fmt,
 	.set_tdm_slot	= rsnd_soc_set_dai_tdm_slot,