linux-kernel - Re: [alsa-devel] [PATCH RFC 01/15] ASoC: qcom: use snd_dma

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Date:	Wed, 3 Feb 2016 08:48:27 +0000
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Patrick Lai <plai@...eaurora.org>, alsa-devel@...a-project.org,
	Banajit Goswami <bgoswami@...eaurora.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Takashi Iwai <tiwai@...e.com>, Mark Brown <broonie@...nel.org>
Subject: Re: [alsa-devel] [PATCH RFC 01/15] ASoC: qcom: use
 snd_dma_alloc/free* apis



On 03/02/16 00:35, Kenneth Westfield wrote:
> On Mon, Feb 01, 2016 at 09:27:59AM -0800, Srinivas Kandagatla wrote:
>> diff --git a/sound/soc/qcom/lpass-platform.c
>> b/sound/soc/qcom/lpass-platform.c
>> index 4aeb8e1..a6dce1b 100644
>> --- a/sound/soc/qcom/lpass-platform.c
>> +++ b/sound/soc/qcom/lpass-platform.c
>> @@ -439,39 +439,6 @@ static irqreturn_t lpass_platform_lpaif_irq(int irq,
>> void *data)
>>   	return IRQ_HANDLED;
>>   }
>>
>> -static int lpass_platform_alloc_buffer(struct snd_pcm_substream
>> *substream,
>> -		struct snd_soc_pcm_runtime *rt)
>> -{
>> -	struct snd_dma_buffer *buf = &substream->dma_buffer;
>> -	size_t size = lpass_platform_pcm_hardware.buffer_bytes_max;
>> -
>> -	buf->dev.type = SNDRV_DMA_TYPE_DEV;
>> -	buf->dev.dev = rt->platform->dev;
>> -	buf->private_data = NULL;
>> -	buf->area = dma_alloc_coherent(rt->platform->dev, size,
>> &buf->addr,
>> -			GFP_KERNEL);
>> -	if (!buf->area) {
>> -		dev_err(rt->platform->dev, "%s: Could not allocate DMA
>> buffer\n",
>> -				__func__);
>> -		return -ENOMEM;
>> -	}
>
> ...
>
>> @@ -499,7 +467,8 @@ static int lpass_platform_pcm_new(struct
>> snd_soc_pcm_runtime *soc_runtime)
>>
>>   	snd_soc_pcm_set_drvdata(soc_runtime, data);
>>
>> -	ret = lpass_platform_alloc_buffer(substream, soc_runtime);
>> +	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
>> +				size, &substream->dma_buffer);
>>   	if (ret)
>>   		return ret;
>>
>
> Is there a particular reason for using the soundcard device (pcm-card->dev)
> rather than the platform device (rt->platform->dev) for memory
> allocation?  Especially considering you posted a fix for this several
> weeks ago (ASoC: qcom: use correct device pointer in dma allocation).

Thanks for spotting this, I will fix it and resend it with platform->dev.

>