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authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2015-06-15 06:21:15 +0000
committerMark Brown <broonie@kernel.org>2015-06-16 12:34:01 +0100
commit75defee0f1b3fcd91d8a304d6444635a459b8249 (patch)
treedd5d78d7c54bdeacbc3e6e5cc1e17fe7c770ff95 /sound/soc
parent12927a8f80264256e6cb2d3241fe9d6f4ad7face (diff)
downloadlinux-75defee0f1b3fcd91d8a304d6444635a459b8249.tar.bz2
ASoC: rsnd: don't call snd_pcm_period_elapsed() under spin lock
'a9e1ac1a9e4585b5("ASoC: rsnd: spin lock for interrupt handler")' added spin lock under interrupt handler to solve HW restart issue. OTOH, current rsnd driver calls snd_pcm_period_elapsed() from rsnd_dai_pointer_update(). but, it will be called under spin lock if SSI was PIO mode. If it was called under spin lock, it will call snd_pcm_update_state() -> snd_pcm_drain_done(). Then, it calls rsnd_soc_dai_trigger() and will be dead-lock. This patch doesn't call rsnd_dai_pointer_update() under spin lock Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/sh/rcar/core.c20
-rw-r--r--sound/soc/sh/rcar/dma.c11
-rw-r--r--sound/soc/sh/rcar/rsnd.h3
-rw-r--r--sound/soc/sh/rcar/ssi.c6
4 files changed, 35 insertions, 5 deletions
diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index d460d2aa82ee..027b04392674 100644
--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -302,7 +302,7 @@ int rsnd_dai_pointer_offset(struct rsnd_dai_stream *io, int additional)
return pos;
}
-void rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int byte)
+bool rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int byte)
{
io->byte_pos += byte;
@@ -319,8 +319,24 @@ void rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int byte)
io->next_period_byte = io->byte_per_period;
}
- snd_pcm_period_elapsed(substream);
+ return true;
}
+
+ return false;
+}
+
+void rsnd_dai_period_elapsed(struct rsnd_dai_stream *io)
+{
+ struct snd_pcm_substream *substream = io->substream;
+
+ /*
+ * this function should be called...
+ *
+ * - if rsnd_dai_pointer_update() returns true
+ * - without spin lock
+ */
+
+ snd_pcm_period_elapsed(substream);
}
static void rsnd_dai_stream_init(struct rsnd_dai_stream *io,
diff --git a/sound/soc/sh/rcar/dma.c b/sound/soc/sh/rcar/dma.c
index ac3756f6af60..9034f951adfe 100644
--- a/sound/soc/sh/rcar/dma.c
+++ b/sound/soc/sh/rcar/dma.c
@@ -36,7 +36,10 @@ static void rsnd_dmaen_complete(void *data)
{
struct rsnd_dma *dma = (struct rsnd_dma *)data;
struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
+ struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
+ bool elapsed = false;
+ unsigned long flags;
/*
* Renesas sound Gen1 needs 1 DMAC,
@@ -49,8 +52,14 @@ static void rsnd_dmaen_complete(void *data)
* rsnd_dai_pointer_update() will be called twice,
* ant it will breaks io->byte_pos
*/
+ spin_lock_irqsave(&priv->lock, flags);
+
+ elapsed = rsnd_dai_pointer_update(io, io->byte_per_period);
+
+ spin_unlock_irqrestore(&priv->lock, flags);
- rsnd_dai_pointer_update(io, io->byte_per_period);
+ if (elapsed)
+ rsnd_dai_period_elapsed(io);
}
static void rsnd_dmaen_stop(struct rsnd_dma *dma)
diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index 03ff071d012f..e37234ea18e6 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -355,7 +355,8 @@ struct rsnd_dai {
struct rsnd_dai *rsnd_rdai_get(struct rsnd_priv *priv, int id);
-void rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int cnt);
+bool rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int cnt);
+void rsnd_dai_period_elapsed(struct rsnd_dai_stream *io);
int rsnd_dai_pointer_offset(struct rsnd_dai_stream *io, int additional);
/*
diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 856917392b79..25483211a349 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -426,6 +426,7 @@ static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
int is_dma = rsnd_ssi_is_dma_mode(mod);
u32 status;
+ bool elapsed = false;
spin_lock(&priv->lock);
@@ -451,7 +452,7 @@ static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
else
*buf = rsnd_mod_read(mod, SSIRDR);
- rsnd_dai_pointer_update(io, sizeof(*buf));
+ elapsed = rsnd_dai_pointer_update(io, sizeof(*buf));
}
/* DMA only */
@@ -476,6 +477,9 @@ static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
rsnd_ssi_interrupt_out:
spin_unlock(&priv->lock);
+ if (elapsed)
+ rsnd_dai_period_elapsed(io);
+
return IRQ_HANDLED;
}