ASoC: core - PCM mutex per rtd

In preparation for the new ASoC Dynamic PCM support (AKA DSP support).

The new ASoC Dynamic PCM core allows DAIs to be dynamically re-routed
at runtime between the PCM device end (or Frontend - FE) and the physical DAI
(Backend - BE) using regular kcontrols (just like a hardware CODEC routes
audio in the analog domain). The Dynamic PCM core therefore must be
able to call PCM operations for both the Frontend and Backend(s) DAIs at
the same time.

Currently we have a global pcm_mutex that is used to serialise
the ASoC PCM operations. This patch removes the global mutex
and adds a mutex per RTD allowing the PCM operations to be reentrant and
allow control of more than one DAI at at time. e.g. a frontend PCM hw_params()
could configure multiple backend DAI hw_params() with similar or different
hw parameters at the same time.

Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index d5db87e82c6..4334ab25c5d 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -269,6 +269,11 @@ enum snd_soc_compress_type {
         SND_SOC_RBTREE_COMPRESSION
 };
 
+enum snd_soc_pcm_subclass {
+        SND_SOC_PCM_CLASS_PCM   = 0,
+        SND_SOC_PCM_CLASS_BE    = 1,
+};
+
 int snd_soc_codec_set_sysclk(struct snd_soc_codec *codec, int clk_id,
                              unsigned int freq, int dir);
 int snd_soc_codec_set_pll(struct snd_soc_codec *codec, int pll_id, int source,
@@ -809,6 +814,9 @@ struct snd_soc_pcm_runtime  {
         struct device dev;
         struct snd_soc_card *card;
         struct snd_soc_dai_link *dai_link;
+        struct mutex pcm_mutex;
+        enum snd_soc_pcm_subclass pcm_subclass;
+        struct snd_pcm_ops ops;
 
         unsigned int complete:1;
         unsigned int dev_registered:1;