[PATCH v3 02/23] ASoC: soc-pcm: indicate warning if DPCM BE Codec has no settings

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

Historically, ASoC doesn't have validation check for DPCM BE Codec,
but it should have. Current ASoC is ignoring it same as before,
but let's indicate the warning about that.

This warning and code should be removed and cleaned if all DPCM BE
Codec driver has necessary settings in the future.
One of the big user which doesn't have it is Intel.
Below is at least already known settings missing driver.

	--- sound/soc/codecs/hda.c ---

	static struct snd_soc_dai_driver card_binder_dai = {
		.id = -1,
		.name = "codec-probing-DAI",
+		.capture.channels_min = 1,
+		.playback.channels_min = 1,
	};

	--- sound/pci/hda/patch_hdmi.c ---

	static int generic_hdmi_build_pcms(...)
	{
		...
		for (...) {
			...
+			pstr->channels_min = 1;
		}

		return 0;
	}

Link: https://lore.kernel.org/r/ab3f0c0a-62fd-a468-b3cf-0e4b59bac6ae@xxxxxxxxxxxxxxx
Cc: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
 sound/soc/soc-pcm.c | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 412e7b7d97f5..a79ca115f4e7 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -2797,7 +2797,6 @@ static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
 	struct snd_soc_dai_link_ch_map *ch_maps;
 	struct snd_soc_dai *cpu_dai;
 	struct snd_soc_dai *codec_dai;
-	struct snd_soc_dai *dummy_dai = snd_soc_find_dai(&snd_soc_dummy_dlc);
 	int cpu_playback;
 	int cpu_capture;
 	int has_playback = 0;
@@ -2836,24 +2835,36 @@ static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
 	 *	soc.h :: [dai_link->ch_maps Image sample]
 	 */
 	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);
+		int cpu_play_t, cpu_capture_t;
+		int codec_play_t, codec_capture_t;
+
+		cpu_dai		= snd_soc_rtd_to_cpu(rtd,   ch_maps->cpu);
+		codec_dai	= snd_soc_rtd_to_codec(rtd, ch_maps->codec);
+
+		cpu_play_t	= snd_soc_dai_stream_valid(cpu_dai,   cpu_playback);
+		codec_play_t	= snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK);
+
+		cpu_capture_t	= snd_soc_dai_stream_valid(cpu_dai,   cpu_capture);
+		codec_capture_t	= snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE);
 
 		/*
-		 * FIXME
+		 * FIXME / CLEAN-UP-ME
 		 *
 		 * DPCM BE Codec has been no checked before.
 		 * It should be checked, but it breaks compatibility.
 		 * It ignores BE Codec here, so far.
 		 */
-		if (dai_link->no_pcm)
-			codec_dai = dummy_dai;
+		if ((dai_link->no_pcm) &&
+		    (!codec_play_t && !codec_capture_t)) {
+			dev_warn_once(rtd->dev, "DCPM BE Codec has no stream settings (%s)\n",
+				      codec_dai->name);
+			codec_play_t	= 1;
+			codec_capture_t	= 1;
+		}
 
-		if (snd_soc_dai_stream_valid(cpu_dai,   cpu_playback) &&
-		    snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK))
+		if (cpu_play_t && codec_play_t)
 			has_playback = 1;
-		if (snd_soc_dai_stream_valid(cpu_dai,   cpu_capture) &&
-		    snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE))
+		if (cpu_capture_t && codec_capture_t)
 			has_capture = 1;
 	}
 
-- 
2.25.1