linux-kernel - Re: [alsa-devel] [PATCH 2/2] ASoC: atmel-pcm: use generic dmaengine framework

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Date:	Tue, 02 Jul 2013 17:34:30 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Bo Shen <voice.shen@...el.com>
CC:	Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
	richard.genoud@...il.com, Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [alsa-devel] [PATCH 2/2] ASoC: atmel-pcm: use generic dmaengine
 framework

On 07/02/2013 11:04 AM, Bo Shen wrote:
[...]
> -/*--------------------------------------------------------------------------*\
> - * DMAENGINE operations
> -\*--------------------------------------------------------------------------*/
> -static bool filter(struct dma_chan *chan, void *slave)
> -{
> -	struct at_dma_slave *sl = slave;
> -
> -	if (sl->dma_dev == chan->device->dev) {
> -		chan->private = sl;
> -		return true;
> -	} else {
> -		return false;
> -	}
> -}

I'm wondering why is filtering no longer required?

[...]
> +		slave_config->dst_addr = (dma_addr_t)ssc->phybase + SSC_THR;
[...]
> +		slave_config->src_addr = (dma_addr_t)ssc->phybase + SSC_RHR;

Change the type of phybase to dma_addr_t

[...]
>  }
>  
> -static int atmel_pcm_dma_prepare(struct snd_pcm_substream *substream)
> -{
> -	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> -	struct atmel_pcm_dma_params *prtd;
> -
> -	prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
> -
> -	ssc_writex(prtd->ssc->regs, SSC_IER, prtd->mask->ssc_error);
> -	ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_enable);

These writes are also completely lost

> -
> -	return 0;
> -}

I think it would also be good to get rid of any references to the ssc struct
from the DMA driver and move them over to the DAI driver.

- Lars
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