ASoC: sprd: Use managed buffer allocation

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

Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210802072815.13551-16-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/sprd/sprd-pcm-dma.c

@@ -204,8 +204,6 @@ static int sprd_pcm_hw_params(struct snd_soc_component *component,
 	if (!dma_params) {
 		dev_warn(component->dev, "no dma parameters setting\n");
 		dma_private->params = NULL;
-		snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-		runtime->dma_bytes = totsize;
 		return 0;
 	}
 
@@ -217,9 +215,6 @@ static int sprd_pcm_hw_params(struct snd_soc_component *component,
 			return ret;
 	}
 
-	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
-	runtime->dma_bytes = totsize;
 	sg_num = totsize / period;
 	dma_private->dma_addr_offset = totsize / channels;
 
@@ -310,7 +305,6 @@ sg_err:
 static int sprd_pcm_hw_free(struct snd_soc_component *component,
 			    struct snd_pcm_substream *substream)
 {
-	snd_pcm_set_runtime_buffer(substream, NULL);
 	sprd_pcm_release_dma_channel(substream);
 
 	return 0;
@@ -435,73 +429,20 @@ static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_soc_component *component,
 	return x;
 }
 
-static int sprd_pcm_mmap(struct snd_soc_component *component,
-			 struct snd_pcm_substream *substream,
-			 struct vm_area_struct *vma)
-{
-	struct snd_pcm_runtime *runtime = substream->runtime;
-
-	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
-	return remap_pfn_range(vma, vma->vm_start,
-			       runtime->dma_addr >> PAGE_SHIFT,
-			       vma->vm_end - vma->vm_start,
-			       vma->vm_page_prot);
-}
-
 static int sprd_pcm_new(struct snd_soc_component *component,
 			struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_card *card = rtd->card->snd_card;
 	struct snd_pcm *pcm = rtd->pcm;
-	struct snd_pcm_substream *substream;
 	int ret;
 
 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 	if (ret)
 		return ret;
 
-	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
-	if (substream) {
-		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
-					  sprd_pcm_hardware.buffer_bytes_max,
-					  &substream->dma_buffer);
-		if (ret) {
-			dev_err(card->dev,
-				"can't alloc playback dma buffer: %d\n", ret);
-			return ret;
-		}
-	}
-
-	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
-	if (substream) {
-		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
-					  sprd_pcm_hardware.buffer_bytes_max,
-					  &substream->dma_buffer);
-		if (ret) {
-			dev_err(card->dev,
-				"can't alloc capture dma buffer: %d\n", ret);
-			snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
-			return ret;
-		}
-	}
-
-	return 0;
-}
-
-static void sprd_pcm_free(struct snd_soc_component *component,
-			  struct snd_pcm *pcm)
-{
-	struct snd_pcm_substream *substream;
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) {
-		substream = pcm->streams[i].substream;
-		if (substream) {
-			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,
+					    sprd_pcm_hardware.buffer_bytes_max);
 }
 
 static const struct snd_soc_component_driver sprd_soc_component = {
@@ -512,9 +453,7 @@ static const struct snd_soc_component_driver sprd_soc_component = {
 	.hw_free	= sprd_pcm_hw_free,
 	.trigger	= sprd_pcm_trigger,
 	.pointer	= sprd_pcm_pointer,
-	.mmap		= sprd_pcm_mmap,
 	.pcm_construct	= sprd_pcm_new,
-	.pcm_destruct	= sprd_pcm_free,
 	.compress_ops	= &sprd_platform_compress_ops,
 };