ASoC: Add Multi CPU DAI support

Merge series from Bard Liao <yung-chuan.liao@linux.intel.com>:

As discussed in [1], ASoC core supports multi codec DAIs
on a DAI link. However it does not do so for CPU DAIs.

So, add support for multi CPU DAIs on a DAI Link by adding
multi CPU DAI in Card instantiation, suspend and resume
functions, PCM ops, stream handling functions and DAPM.

[1]: https://www.spinics.net/lists/alsa-devel/msg71369.html

changes in v5:
- rebase to latest kernel base

Bard Liao (2):
  ASoC: Return error if the function does not support multi-cpu
  ASoC: pcm: check if cpu-dai supports a given stream

Shreyas NC (4):
  ASoC: Add initial support for multiple CPU DAIs
  ASoC: Add multiple CPU DAI support for PCM ops
  ASoC: Add dapm_add_valid_dai_widget helper
  ASoC: Add multiple CPU DAI support in DAPM

 include/sound/soc.h                   |  15 +
 sound/soc/soc-compress.c              |   5 +-
 sound/soc/soc-core.c                  | 168 +++++-----
 sound/soc/soc-dapm.c                  | 133 ++++----
 sound/soc/soc-generic-dmaengine-pcm.c |  18 +
 sound/soc/soc-pcm.c                   | 463 ++++++++++++++++++--------
 6 files changed, 531 insertions(+), 271 deletions(-)

--
2.17.1

1 files changed, 15 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 8a2266676b2d..81e5d17be935 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -855,6 +855,11 @@ struct snd_soc_dai_link {
 	     ((platform) = &link->platforms[i]);			\
 	     (i)++)
 
+#define for_each_link_cpus(link, i, cpu)				\
+	for ((i) = 0;							\
+	     ((i) < link->num_cpus) && ((cpu) = &link->cpus[i]);	\
+	     (i)++)
+
 /*
  * Sample 1 : Single CPU/Codec/Platform
  *
@@ -1132,6 +1137,9 @@ struct snd_soc_pcm_runtime {
 	struct snd_soc_dai **codec_dais;
 	unsigned int num_codecs;
 
+	struct snd_soc_dai **cpu_dais;
+	unsigned int num_cpus;
+
 	struct delayed_work delayed_work;
 	void (*close_delayed_work_func)(struct snd_soc_pcm_runtime *rtd);
 #ifdef CONFIG_DEBUG_FS
@@ -1159,6 +1167,13 @@ struct snd_soc_pcm_runtime {
 #define for_each_rtd_codec_dai_rollback(rtd, i, dai)		\
 	for (; (--(i) >= 0) && ((dai) = rtd->codec_dais[i]);)
 
+#define for_each_rtd_cpu_dai(rtd, i, dai)\
+	for ((i) = 0;						       \
+	     ((i) < rtd->num_cpus) && ((dai) = rtd->cpu_dais[i]); \
+	     (i)++)
+#define for_each_rtd_cpu_dai_rollback(rtd, i, dai)		\
+	for (; (--(i) >= 0) && ((dai) = rtd->cpu_dais[i]);)
+
 void snd_soc_close_delayed_work(struct snd_soc_pcm_runtime *rtd);
 
 /* mixer control */