linux-kernel - Re: [RFC PATCH v3 3/4] ASoC: fsl_asrc_dma: Reuse the dma channel if available in Back-End

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Message-ID: <20200612080817.GC22422@Asurada-Nvidia>
Date:   Fri, 12 Jun 2020 01:08:17 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     lars@...afoo.de, perex@...ex.cz, tiwai@...e.com,
        lgirdwood@...il.com, broonie@...nel.org, timur@...nel.org,
        Xiubo.Lee@...il.com, festevam@...il.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v3 3/4] ASoC: fsl_asrc_dma: Reuse the dma channel if
 available in Back-End

On Fri, Jun 12, 2020 at 03:37:50PM +0800, Shengjiu Wang wrote:
> The dma channel has been requested by Back-End cpu dai driver already.
> If fsl_asrc_dma requests dma chan with same dma:tx symlink, then
> there will be below warning with SDMA.
> 
> [   48.174236] fsl-esai-dai 2024000.esai: Cannot create DMA dma:tx symlink
> 
> So if we can reuse the dma channel of Back-End, then the issue can be
> fixed.
> 
> In order to get the dma channel which is already requested in Back-End.
> we use the exported two functions (snd_soc_lookup_component_nolocked
> and soc_component_to_pcm). If we can get the dma channel, then reuse it,
> if can't, then request a new one.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>

Reviewed-by: Nicolin Chen <nicoleotsuka@...il.com>