From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
'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 --- sound/soc/sh/rcar/core.c | 20 ++++++++++++++++++-- sound/soc/sh/rcar/dma.c | 11 ++++++++++- sound/soc/sh/rcar/rsnd.h | 3 ++- sound/soc/sh/rcar/ssi.c | 6 +++++- 4 files changed, 35 insertions(+), 5 deletions(-)
diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c index d460d2a..027b043 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 144308f..ac19ab1 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 03ff071..e37234e 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 8569173..2548321 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; }