linux-kernel - Re: [PATCH v2 2/2] ASoC: fsl_asrc: Add ASRC ASoC CPU DAI and platform drivers

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Date:	Thu, 24 Jul 2014 17:20:45 +0200
From:	Tobias Klauser <tklauser@...tanz.ch>
To:	Nicolin Chen <nicoleotsuka@...il.com>
Cc:	broonie@...nel.org, shawn.guo@...aro.org, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rdunlap@...radead.org, lgirdwood@...il.com, perex@...ex.cz,
	tiwai@...e.de, timur@...i.org, grant.likely@...aro.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org,
	b02247@...escale.com, b42378@...escale.com
Subject: Re: [PATCH v2 2/2] ASoC: fsl_asrc: Add ASRC ASoC CPU DAI and
 platform drivers

On 2014-07-24 at 10:35:29 +0200, Nicolin Chen <nicoleotsuka@...il.com> wrote:
> The Asynchronous Sample Rate Converter (ASRC) converts the sampling rate of a
> signal associated with an input clock into a signal associated with a different
> output clock. The driver currently works as a Front End of DPCM with other Back
> Ends DAI links such as ESAI<->CS42888 and SSI<->WM8962 and SAI. It converts the
> original sample rate to a common rate supported by Back Ends for playback while
> converts the common rate of Back Ends to a desired rate for capture. It has 3
> pairs to support three different substreams within totally 10 channels.
> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
> ---

[...]

> --- /dev/null
> +++ b/sound/soc/fsl/fsl_asrc.c
> @@ -0,0 +1,1031 @@

[...]

> +static struct platform_driver fsl_asrc_driver = {
> +	.probe = fsl_asrc_probe,
> +	.driver = {
> +		.name = "fsl-asrc",
> +		.owner = THIS_MODULE,

Not necessary, this will be set by module_platform_driver (or
the expansion of platform_driver_register, respectively).

> +		.of_match_table = fsl_asrc_ids,
> +		.pm = &fsl_asrc_pm,
> +	},
> +};
> +module_platform_driver(fsl_asrc_driver);

[...]

> --- /dev/null
> +++ b/sound/soc/fsl/fsl_asrc_dma.c
> @@ -0,0 +1,384 @@

[...]

> +static int fsl_asrc_dma_pcm_new(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;
> +	u64 dma_mask = DMA_BIT_MASK(32);
> +	int ret, i;
> +
> +	if (!card->dev->dma_mask)
> +		card->dev->dma_mask = &dma_mask;

dma_mask will go out of scope after fsl_asrc_dma_pcm_new returns,
resulting in a stray pointer in card->dev->dma_mask.

> +	if (!card->dev->coherent_dma_mask)
> +		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
> +
> +	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
> +		substream = pcm->streams[i].substream;
> +
> +		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)
> +		snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
> +
> +	return ret;
> +}
> +
> +static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm)
> +{
> +	struct snd_pcm_substream *substream;
> +	int i;
> +
> +	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; 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;
> +	}
> +}
> +
> +struct snd_soc_platform_driver fsl_asrc_platform = {
> +	.ops		= &fsl_asrc_dma_pcm_ops,
> +	.pcm_new	= fsl_asrc_dma_pcm_new,
> +	.pcm_free	= fsl_asrc_dma_pcm_free,
> +};
> +EXPORT_SYMBOL_GPL(fsl_asrc_platform);
> -- 
> 1.8.4
--
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