ASoC: fsl_asrc_dma: Use managed buffer allocation

This patch simplifies the buffer pre-allocation code of fsl_asrc_dma
driver with the standard managed buffer helper.  It uses the newly
introduced fixed-size buffer allocation helper.

Cc: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: Xiubo Li <Xiubo.Lee@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Shengjiu Wang <shengjiu.wang@gmail.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210802072815.13551-11-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/fsl/fsl_asrc_dma.c

@@ -284,8 +284,6 @@ static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
 		return ret;
 	}
 
-	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
 	return 0;
 }
 
@@ -297,8 +295,6 @@ static int fsl_asrc_dma_hw_free(struct snd_soc_component *component,
 	struct fsl_asrc_pair *pair = runtime->private_data;
 	u8 dir = tx ? OUT : IN;
 
-	snd_pcm_set_runtime_buffer(substream, NULL);
-
 	if (pair->dma_chan[!dir])
 		dma_release_channel(pair->dma_chan[!dir]);
 
@@ -423,9 +419,8 @@ static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component,
 				struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_card *card = rtd->card->snd_card;
-	struct snd_pcm_substream *substream;
 	struct snd_pcm *pcm = rtd->pcm;
-	int ret, i;
+	int ret;
 
 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 	if (ret) {
@@ -433,43 +428,8 @@ static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component,
 		return ret;
 	}
 
-	for_each_pcm_streams(i) {
-		substream = pcm->streams[i].substream;
-		if (!substream)
-			continue;
-
-		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
-				FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
-		if (ret) {
-			dev_err(card->dev, "failed to allocate DMA buffer\n");
-			goto err;
-		}
-	}
-
-	return 0;
-
-err:
-	if (--i == 0 && pcm->streams[i].substream)
-		snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
-
-	return ret;
-}
-
-static void fsl_asrc_dma_pcm_free(struct snd_soc_component *component,
-				  struct snd_pcm *pcm)
-{
-	struct snd_pcm_substream *substream;
-	int i;
-
-	for_each_pcm_streams(i) {
-		substream = pcm->streams[i].substream;
-		if (!substream)
-			continue;
-
-		snd_dma_free_pages(&substream->dma_buffer);
-		substream->dma_buffer.area = NULL;
-		substream->dma_buffer.addr = 0;
-	}
+	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
+					    card->dev, FSL_ASRC_DMABUF_SIZE);
 }
 
 struct snd_soc_component_driver fsl_asrc_component = {
@@ -481,6 +441,5 @@ struct snd_soc_component_driver fsl_asrc_component = {
 	.close		= fsl_asrc_dma_shutdown,
 	.pointer	= fsl_asrc_dma_pcm_pointer,
 	.pcm_construct	= fsl_asrc_dma_pcm_new,
-	.pcm_destruct	= fsl_asrc_dma_pcm_free,
 };
 EXPORT_SYMBOL_GPL(fsl_asrc_component);