ASoC: stm32: Use managed buffer allocation

Clean up the drivers with the new managed buffer allocation API.
The superfluous snd_pcm_lib_malloc_pages() and
snd_pcm_lib_free_pages() calls are dropped, as well as the superfluous
snd_pcm_lib_preallocate_free_for_all() call.  As of the result,
hw_free and pcm_destruct ops became empty and got removed.

Cc: Olivier Moysan <olivier.moysan@st.com>
Cc: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210142614.19405-13-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/stm/stm32_adfsdm.c

@@ -252,7 +252,6 @@ static int stm32_adfsdm_pcm_close(struct snd_soc_component *component,
 	struct stm32_adfsdm_priv *priv =
 		snd_soc_dai_get_drvdata(rtd->cpu_dai);
 
-	snd_pcm_lib_free_pages(substream);
 	priv->substream = NULL;
 
 	return 0;
@@ -276,25 +275,13 @@ static int stm32_adfsdm_pcm_hw_params(struct snd_soc_component *component,
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct stm32_adfsdm_priv *priv =
 		snd_soc_dai_get_drvdata(rtd->cpu_dai);
-	int ret;
 
-	ret =  snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
-	if (ret < 0)
-		return ret;
 	priv->pcm_buff = substream->runtime->dma_area;
 
 	return iio_channel_cb_set_buffer_watermark(priv->iio_cb,
 						   params_period_size(params));
 }
 
-static int stm32_adfsdm_pcm_hw_free(struct snd_soc_component *component,
-				    struct snd_pcm_substream *substream)
-{
-	snd_pcm_lib_free_pages(substream);
-
-	return 0;
-}
-
 static int stm32_adfsdm_pcm_new(struct snd_soc_component *component,
 				struct snd_soc_pcm_runtime *rtd)
 {
@@ -303,30 +290,18 @@ static int stm32_adfsdm_pcm_new(struct snd_soc_component *component,
 		snd_soc_dai_get_drvdata(rtd->cpu_dai);
 	unsigned int size = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE;
 
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
-					      priv->dev, size, size);
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
+				       priv->dev, size, size);
 	return 0;
 }
 
-static void stm32_adfsdm_pcm_free(struct snd_soc_component *component,
-				  struct snd_pcm *pcm)
-{
-	struct snd_pcm_substream *substream;
-
-	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
-	if (substream)
-		snd_pcm_lib_preallocate_free_for_all(pcm);
-}
-
 static struct snd_soc_component_driver stm32_adfsdm_soc_platform = {
 	.open		= stm32_adfsdm_pcm_open,
 	.close		= stm32_adfsdm_pcm_close,
 	.hw_params	= stm32_adfsdm_pcm_hw_params,
-	.hw_free	= stm32_adfsdm_pcm_hw_free,
 	.trigger	= stm32_adfsdm_trigger,
 	.pointer	= stm32_adfsdm_pcm_pointer,
 	.pcm_construct	= stm32_adfsdm_pcm_new,
-	.pcm_destruct	= stm32_adfsdm_pcm_free,
 };
 
 static const struct of_device_id stm32_adfsdm_of_match[] = {