18 Mar
2014
18 Mar
'14
2:23 p.m.
On 03/18/2014 03:20 PM, Peter Ujfalusi wrote:
We need to place constraint on the period if the read or write AFIFO is enabled and it is configured for more than one word otherwise the DMA will fail in buffer configuration where the sizes are not aligned with the requested FIFO configuration.
Oh, I edited the commit message and removed the text related to buffer size but I failed to do that for the commit title :(
Mark: Do you want me to resend with fixed commit title?
--
Péter
>
> Signed-off-by: Peter Ujfalusi peter.ujfalusi@ti.com
> ---
> sound/soc/davinci/davinci-mcasp.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
> index a01ae97c90aa..df067a836c4d 100644
> --- a/sound/soc/davinci/davinci-mcasp.c
> +++ b/sound/soc/davinci/davinci-mcasp.c
> @@ -720,6 +720,7 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
> struct snd_soc_dai *dai)
> {
> struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
> + int afifo_numevt;
>
> if (mcasp->version == MCASP_VERSION_4)
> snd_soc_dai_set_dma_data(dai, substream,
> @@ -727,6 +728,16 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
> else
> snd_soc_dai_set_dma_data(dai, substream, mcasp->dma_params);
>
> + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> + afifo_numevt = mcasp->txnumevt;
> + else
> + afifo_numevt = mcasp->rxnumevt;
> +
> + if (afifo_numevt > 1)
> + snd_pcm_hw_constraint_step(substream->runtime, 0,
> + SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
> + afifo_numevt);
> +
> return 0;
> }
>
>