[PATCH v5 6/6] ASoC: pcm: check if cpu-dai supports a given stream

[Bard Liao]

Now multi-cpu-dais are supported, we can skip cpi-dais which don't
support the current stream, following the example of multi-codec-dais.

Signed-off-by: Bard Liao <yung-chuan.liao at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/soc-pcm.c | 51 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index adbceaff07b8..90857138c823 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -607,6 +607,20 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 
 	/* first calculate min/max only for CPUs in the DAI link */
 	for_each_rtd_cpu_dai(rtd, i, cpu_dai) {
+
+		/*
+		 * Skip CPUs which don't support the current stream type.
+		 * Otherwise, since the rate, channel, and format values will
+		 * zero in that case, we would have no usable settings left,
+		 * causing the resulting setup to fail.
+		 * At least one CPU should match, otherwise we should have
+		 * bailed out on a higher level, since there would be no
+		 * CPU to support the transfer direction in that case.
+		 */
+		if (!snd_soc_dai_stream_valid(cpu_dai,
+					      substream->stream))
+			continue;
+
 		cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 
 		cpu_chan_min = max(cpu_chan_min, cpu_stream->channels_min);
@@ -1115,6 +1129,13 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 	}
 
 	for_each_rtd_cpu_dai(rtd, i, cpu_dai) {
+		/*
+		 * Skip CPUs which don't support the current stream
+		 * type. See soc_pcm_init_runtime_hw() for more details
+		 */
+		if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
+			continue;
+
 		ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
 		if (ret < 0)
 			goto interface_err;
@@ -1150,6 +1171,9 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 
 interface_err:
 	for_each_rtd_cpu_dai_rollback(rtd, i, cpu_dai) {
+		if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
+			continue;
+
 		snd_soc_dai_hw_free(cpu_dai, substream);
 		cpu_dai->rate = 0;
 	}
@@ -1226,8 +1250,12 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 		snd_soc_dai_hw_free(codec_dai, substream);
 	}
 
-	for_each_rtd_cpu_dai(rtd, i, cpu_dai)
+	for_each_rtd_cpu_dai(rtd, i, cpu_dai) {
+		if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
+			continue;
+
 		snd_soc_dai_hw_free(cpu_dai, substream);
+	}
 
 	mutex_unlock(&rtd->card->pcm_mutex);
 	return 0;
@@ -1904,6 +1932,13 @@ static void dpcm_runtime_merge_chan(struct snd_pcm_substream *substream,
 		int i;
 
 		for_each_rtd_cpu_dai(be, i, dai) {
+			/*
+			 * Skip CPUs which don't support the current stream
+			 * type. See soc_pcm_init_runtime_hw() for more details
+			 */
+			if (!snd_soc_dai_stream_valid(dai, stream))
+				continue;
+
 			cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
 
 			*channels_min = max(*channels_min,
@@ -1952,6 +1987,13 @@ static void dpcm_runtime_merge_rate(struct snd_pcm_substream *substream,
 		int i;
 
 		for_each_rtd_cpu_dai(be, i, dai) {
+			/*
+			 * Skip CPUs which don't support the current stream
+			 * type. See soc_pcm_init_runtime_hw() for more details
+			 */
+			if (!snd_soc_dai_stream_valid(dai, stream))
+				continue;
+
 			cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
 
 			*rate_min = max(*rate_min, cpu_stream->rate_min);
@@ -1989,6 +2031,13 @@ static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
 	int i;
 
 	for_each_rtd_cpu_dai(rtd, i, cpu_dai) {
+		/*
+		 * Skip CPUs which don't support the current stream
+		 * type. See soc_pcm_init_runtime_hw() for more details
+		 */
+		if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
+			continue;
+
 		cpu_dai_drv = cpu_dai->driver;
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback);
-- 
2.17.1