[PATCH v3 2/3] ASoC: soc-pcm: Indicate warning if CPU / Codec availability mismatch

[Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>]

Current DCPM is checking CPU side availability only, but it should also
check Codec availability. But because of long DPCM operation history,
it is possible that the some Codec driver check have been bypassed.

It should be error, but let's add grace time to update driver.

This patch indicates warning in above case. Each applicable driver need
to update during this grace time.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Tested-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
---
 sound/soc/soc-pcm.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index c4d80cad59829..71db7379e08aa 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -2795,6 +2795,7 @@ static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
 {
 	struct snd_soc_dai_link *dai_link = rtd->dai_link;
 	struct snd_soc_dai *cpu_dai;
+	struct snd_soc_dai *codec_dai;
 	struct snd_soc_dai_link_ch_map *ch_maps;
 	int has_playback = 0;
 	int has_capture  = 0;
@@ -2806,15 +2807,25 @@ static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
 	}
 
 	if (dai_link->dynamic || dai_link->no_pcm) {
+		int has_playback_both = 0;
+		int has_capture_both = 0;
 
 		for_each_rtd_ch_maps(rtd, i, ch_maps) {
 			cpu_dai	  = snd_soc_rtd_to_cpu(rtd,   ch_maps->cpu);
+			codec_dai = snd_soc_rtd_to_codec(rtd, ch_maps->codec);
 
 			if (snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_PLAYBACK))
 				has_playback = 1;
 
 			if (snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_CAPTURE))
 				has_capture = 1;
+
+			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
+			    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_PLAYBACK))
+				has_playback_both = 1;
+			if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
+			    snd_soc_dai_stream_valid(cpu_dai,   SNDRV_PCM_STREAM_CAPTURE))
+				has_capture_both = 1;
 		}
 
 		/*
@@ -2850,9 +2861,39 @@ static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
 				has_playback = 0;
 			}
 		}
-	} else {
-		struct snd_soc_dai *codec_dai;
 
+		/*
+		 * REMOVE ME
+		 *
+		 * Current DPCM is checking CPU side only, but both CPU and Codec should be
+		 * checked. Indicate warning if there was CPU / Codec mismatch.
+		 * To keep compatibility, warning only for now.
+		 */
+		if ((dai_link->dpcm_playback || dai_link->playback_only) &&
+		    !has_playback_both)
+			dev_warn(rtd->card->dev,
+				 "System requests playback, but not available (%s)."
+				 " Please update Codec driver\n",
+				 dai_link->stream_name);
+		if ((dai_link->dpcm_capture || dai_link->capture_only) &&
+		     !has_capture_both)
+			dev_warn(rtd->card->dev,
+				 "System requests capture, but not available (%s)."
+				 " Please update Codec driver\n",
+				 dai_link->stream_name);
+
+		/*
+		 * REMOVE ME
+		 *
+		 * In case of there was no dpcm_xxx flag, and CPU / Codec mismatch,
+		 * follow new style
+		 */
+		if (!dai_link->dpcm_playback && has_playback)
+			has_playback = has_playback_both;
+		if (!dai_link->dpcm_capture && has_capture)
+			has_capture = has_capture_both;
+
+	} else {
 		/* Adapt stream for codec2codec links */
 		int cpu_capture  = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_CAPTURE);
 		int cpu_playback = snd_soc_get_stream_cpu(dai_link, SNDRV_PCM_STREAM_PLAYBACK);
-- 
2.25.1