ASoC: soc-pcm: move DAIs parameters cleaning into hw_free()

We're now applying soc_hw_params_symmetry() to reject unmatched parameters
while we clear parameters in soc_pcm_close(). So here's a use case might be
broken by this mechanism: aplay -Dhw:0 44100.wav 48000.wav 32000.wav

In this case, we call soc_pcm_open()->soc_pcm_hw_params()->soc_pcm_hw_free()
->soc_pcm_hw_params()->soc_pcm_hw_free()->soc_pcm_close() in order. As we
only clear parameters in soc_pcm_close(). The parameters would be remained
in the system even if the playback of 44100.wav is finished.

Thus, this patch is trying to move parameters cleaning into hw_free() so that
the system can continue to serve this kind of use case.

Also, since we set them in hw_params(), it should be better to clear them in
hw_free() for symmetry.

Signed-off-by: Nicolin Chen <b42378@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index ed1e077..170ff96 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -450,19 +450,6 @@ static int soc_pcm_close(struct snd_pcm_substream *substream)
        codec_dai->active--;
        codec->active--;
 
-       /* clear the corresponding DAIs rate when inactive */
-       if (!cpu_dai->active) {
-               cpu_dai->rate = 0;
-               cpu_dai->channels = 0;
-               cpu_dai->sample_bits = 0;
-       }
-
-       if (!codec_dai->active) {
-               codec_dai->rate = 0;
-               codec_dai->channels = 0;
-               codec_dai->sample_bits = 0;
-       }
-
        /* Muting the DAC suppresses artifacts caused during digital
         * shutdown, for example from stopping clocks.
         */
@@ -682,6 +669,19 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 
        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
+       /* clear the corresponding DAIs parameters when going to be inactive */
+       if (cpu_dai->active == 1) {
+               cpu_dai->rate = 0;
+               cpu_dai->channels = 0;
+               cpu_dai->sample_bits = 0;
+       }
+
+       if (codec_dai->active == 1) {
+               codec_dai->rate = 0;
+               codec_dai->channels = 0;
+               codec_dai->sample_bits = 0;
+       }
+
        /* apply codec digital mute */
        if (!codec->active)
                snd_soc_dai_digital_mute(codec_dai, 1, substream->stream);