ASoC: soc-compress: assume SNDRV_PCM_STREAM_xxx and SND_COMPRESS_xxx are same

soc-compress.c is using both SND_COMPRESS_xxx and SND_PCM_STREAM_xxx.
These are defined as UAPI, and has same value.

	enum {
		SNDRV_PCM_STREAM_PLAYBACK = 0,
		SNDRV_PCM_STREAM_CAPTURE,
		...
	};

	enum snd_compr_direction {
		SND_COMPRESS_PLAYBACK = 0,
		SND_COMPRESS_CAPTURE
	};

Essentially both COMPRESS and PCM_STREAM definitions are identical,
and can be never different because of ABI compatibility,
which means it's safe to mix both variants in the code.

This patch checks it by BUILD_BUG_ON(), and merge to use.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87361wmsyg.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c
index 52544a8..c7ad52a 100644 (file)
--- a/sound/soc/soc-compress.c
+++ b/sound/soc/soc-compress.c
@@ -75,14 +75,9 @@ static int soc_compr_open(struct snd_compr_stream *cstream)
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component = NULL;
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
-       int stream;
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
        int ret;
 
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               stream = SNDRV_PCM_STREAM_PLAYBACK;
-       else
-               stream = SNDRV_PCM_STREAM_CAPTURE;
-
        ret = snd_soc_pcm_component_pm_runtime_get(rtd, cstream);
        if (ret < 0)
                goto pm_err;
@@ -128,14 +123,9 @@ static int soc_compr_open_fe(struct snd_compr_stream *cstream)
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
        struct snd_soc_dpcm *dpcm;
        struct snd_soc_dapm_widget_list *list;
-       int stream;
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
        int ret;
 
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               stream = SNDRV_PCM_STREAM_PLAYBACK;
-       else
-               stream = SNDRV_PCM_STREAM_CAPTURE;
-
        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
        fe->dpcm[stream].runtime = fe_substream->runtime;
 
@@ -203,15 +193,10 @@ static int soc_compr_free(struct snd_compr_stream *cstream)
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
        struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
-       int stream;
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 
        mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               stream = SNDRV_PCM_STREAM_PLAYBACK;
-       else
-               stream = SNDRV_PCM_STREAM_CAPTURE;
-
        snd_soc_runtime_deactivate(rtd, stream);
 
        snd_soc_dai_digital_mute(codec_dai, 1, stream);
@@ -242,15 +227,11 @@ static int soc_compr_free_fe(struct snd_compr_stream *cstream)
        struct snd_soc_pcm_runtime *fe = cstream->private_data;
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
        struct snd_soc_dpcm *dpcm;
-       int stream, ret;
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
+       int ret;
 
        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
 
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               stream = SNDRV_PCM_STREAM_PLAYBACK;
-       else
-               stream = SNDRV_PCM_STREAM_CAPTURE;
-
        snd_soc_runtime_deactivate(fe, stream);
 
        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
@@ -310,16 +291,11 @@ static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
-       int stream;
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
        int ret;
 
        mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               stream = SNDRV_PCM_STREAM_PLAYBACK;
-       else
-               stream = SNDRV_PCM_STREAM_CAPTURE;
-
        ret = soc_compr_components_trigger(cstream, cmd);
        if (ret < 0)
                goto out;
@@ -346,17 +322,13 @@ static int soc_compr_trigger_fe(struct snd_compr_stream *cstream, int cmd)
 {
        struct snd_soc_pcm_runtime *fe = cstream->private_data;
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
-       int ret, stream;
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
+       int ret;
 
        if (cmd == SND_COMPR_TRIGGER_PARTIAL_DRAIN ||
            cmd == SND_COMPR_TRIGGER_DRAIN)
                return soc_compr_components_trigger(cstream, cmd);
 
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               stream = SNDRV_PCM_STREAM_PLAYBACK;
-       else
-               stream = SNDRV_PCM_STREAM_CAPTURE;
-
        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
 
        ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
@@ -418,6 +390,7 @@ static int soc_compr_set_params(struct snd_compr_stream *cstream,
 {
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
        int ret;
 
        mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
@@ -441,12 +414,7 @@ static int soc_compr_set_params(struct snd_compr_stream *cstream,
        if (ret < 0)
                goto err;
 
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
-                                         SND_SOC_DAPM_STREAM_START);
-       else
-               snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
-                                         SND_SOC_DAPM_STREAM_START);
+       snd_soc_dapm_stream_event(rtd, stream, SND_SOC_DAPM_STREAM_START);
 
        /* cancel any delayed stream shutdown that is pending */
        rtd->pop_wait = 0;
@@ -468,12 +436,8 @@ static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
        struct snd_pcm_substream *fe_substream =
                 fe->pcm->streams[cstream->direction].substream;
        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
-       int ret, stream;
-
-       if (cstream->direction == SND_COMPRESS_PLAYBACK)
-               stream = SNDRV_PCM_STREAM_PLAYBACK;
-       else
-               stream = SNDRV_PCM_STREAM_CAPTURE;
+       int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
+       int ret;
 
        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
 
@@ -771,6 +735,13 @@ int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
        int playback = 0, capture = 0;
        int i;
 
+       /*
+        * make sure these are same value,
+        * and then use these as equally
+        */
+       BUILD_BUG_ON((int)SNDRV_PCM_STREAM_PLAYBACK != (int)SND_COMPRESS_PLAYBACK);
+       BUILD_BUG_ON((int)SNDRV_PCM_STREAM_CAPTURE  != (int)SND_COMPRESS_CAPTURE);
+
        if (rtd->num_cpus > 1 ||
            rtd->num_codecs > 1) {
                dev_err(rtd->card->dev,