From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Renesas Sound uses many modules (SSI/SSIU/SRC/CTU/MIX/DVC/DMA),
and supports complex connections/path.
Thus each modules needs to save its status to correctly control it.
This status is updated when by .trigger, and .hw_params/.hw_free.
Renesas Sound is protecting modules by using lock when .trigger,
but it was not enough to protecting each modules "status" if it was
used from many paths.
1) .hw_params/.hw_free update status
2) another doesn't update status, but overwrites by same value
This patch do
1) protects .hw_params/.hw_free by lock
2) do nothing if no status update
Without this patch, protected mod->status (= .trigger) might be
overwrote by non protected mod->status (= .hw_params / .hw_free),
and in such case, CTU/MIX/DVC/SSIU/SSI which are used from
many paths might get damage.
If above issue happens, Renesas Sound will be hung (= silence)
and never be recoverd.
I could reproduce this issue by continue playing very short sound
with loop very long term (3-4 hours) through 2 inputs (= MIXer).
For updating rsnd_status_update(), this patch removes rsnd_dai_call()
debug message. Because we already have debugfs support, and is not
good match to new code.
Reported-by: Linh Phung T. Y <linh.phung.jy@xxxxxxxxxxx>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
sound/soc/sh/rcar/core.c | 50 ++++++++++++++++++++++++----------------
sound/soc/sh/rcar/rsnd.h | 12 +++++-----
2 files changed, 36 insertions(+), 26 deletions(-)
diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index 385d202146c6..a5d13b801492 100644
--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -90,14 +90,6 @@
*
*/
-/*
- * you can enable below define if you don't need
- * DAI status debug message when debugging
- * see rsnd_dbg_dai_call()
- *
- * #define RSND_DEBUG_NO_DAI_CALL 1
- */
-
#include <linux/pm_runtime.h>
#include "rsnd.h"
@@ -534,14 +526,20 @@ static enum rsnd_mod_type rsnd_mod_sequence[][RSND_MOD_MAX] = {
},
};
-static int rsnd_status_update(u32 *status,
+static int rsnd_status_update(struct rsnd_dai_stream *io,
+ struct rsnd_mod *mod, enum rsnd_mod_type type,
int shift, int add, int timing)
{
+ u32 *status = mod->ops->get_status(mod, io, type);
u32 mask = 0xF << shift;
u8 val = (*status >> shift) & 0xF;
u8 next_val = (val + add) & 0xF;
int func_call = (val == timing);
+ /* no status update */
+ if (add == 0 || shift == 28)
+ return 1;
+
if (next_val == 0xF) /* underflow case */
func_call = -1;
else
@@ -559,14 +557,10 @@ static int rsnd_status_update(u32 *status,
enum rsnd_mod_type *types = rsnd_mod_sequence[is_play]; \
for_each_rsnd_mod_arrays(i, mod, io, types, RSND_MOD_MAX) { \
int tmp = 0; \
- u32 *status = mod->ops->get_status(mod, io, types[i]); \
- int func_call = rsnd_status_update(status, \
+ int func_call = rsnd_status_update(io, mod, types[i], \
__rsnd_mod_shift_##fn, \
__rsnd_mod_add_##fn, \
__rsnd_mod_call_##fn); \
- rsnd_dbg_dai_call(dev, "%s\t0x%08x %s\n", \
- rsnd_mod_name(mod), *status, \
- (func_call && (mod)->ops->fn) ? #fn : ""); \
if (func_call > 0 && (mod)->ops->fn) \
tmp = (mod)->ops->fn(mod, io, param); \
if (unlikely(func_call < 0) || \
@@ -1417,6 +1411,26 @@ static int rsnd_dai_probe(struct rsnd_priv *priv)
/*
* pcm ops
*/
+static int rsnd_hw_update(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_soc_dai *dai = rsnd_substream_to_dai(substream);
+ struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
+ struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);
+ struct rsnd_priv *priv = rsnd_io_to_priv(io);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (hw_params)
+ ret = rsnd_dai_call(hw_params, io, substream, hw_params);
+ else
+ ret = rsnd_dai_call(hw_free, io, substream);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return ret;
+}
+
static int rsnd_hw_params(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
@@ -1524,17 +1538,13 @@ static int rsnd_hw_params(struct snd_soc_component *component,
}
}
- return rsnd_dai_call(hw_params, io, substream, hw_params);
+ return rsnd_hw_update(substream, hw_params);
}
static int rsnd_hw_free(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
- struct snd_soc_dai *dai = rsnd_substream_to_dai(substream);
- struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
- struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);
-
- return rsnd_dai_call(hw_free, io, substream);
+ return rsnd_hw_update(substream, NULL);
}
static snd_pcm_uframes_t rsnd_pointer(struct snd_soc_component *component,
diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index 0527aa8e139c..159754b7bb53 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -397,12 +397,12 @@ struct rsnd_mod {
#define __rsnd_mod_add_remove 0
#define __rsnd_mod_add_prepare 0
#define __rsnd_mod_add_cleanup 0
-#define __rsnd_mod_add_init 1
-#define __rsnd_mod_add_quit -1
-#define __rsnd_mod_add_start 1
-#define __rsnd_mod_add_stop -1
-#define __rsnd_mod_add_hw_params 1
-#define __rsnd_mod_add_hw_free -1
+#define __rsnd_mod_add_init 1 /* needs protect */
+#define __rsnd_mod_add_quit -1 /* needs protect */
+#define __rsnd_mod_add_start 1 /* needs protect */
+#define __rsnd_mod_add_stop -1 /* needs protect */
+#define __rsnd_mod_add_hw_params 1 /* needs protect */
+#define __rsnd_mod_add_hw_free -1 /* needs protect */
#define __rsnd_mod_add_irq 0
#define __rsnd_mod_add_pcm_new 0
#define __rsnd_mod_add_fallback 0
--
2.25.1
