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From: Shengjiu Wang <shengjiu.wang@gmail.com>
Date: Thu, 21 May 2020 19:30:04 +0800
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Subject: Re: [PATCH] ASoC: fsl: imx-pcm-dma: Don't request dma channel in probe
To: Mark Brown <broonie@kernel.org>
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On Wed, May 20, 2020 at 8:38 PM Mark Brown <broonie@kernel.org> wrote:
>
> On Wed, May 20, 2020 at 07:22:19PM +0800, Shengjiu Wang wrote:
>
> > I see some driver also request dma channel in open() or hw_params().
> > how can they avoid the defer probe issue?
> > for example=EF=BC=9A
> > sound/arm/pxa2xx-pcm-lib.c
> > sound/soc/sprd/sprd-pcm-dma.c
>
> Other drivers having problems means those drivers should be fixed, not
> that we should copy the problems.  In the case of the PXA driver that's
> very old code which predates deferred probe by I'd guess a decade.

Thanks.

For the FE-BE case, do you have any suggestion for how fix it?

With DMA1->ASRC->DMA2->ESAI case, the DMA1->ASRC->DMA2
is in FE,  ESAI is in BE.  When ESAI drvier probe,  DMA3 channel is
created with ESAI's "dma:tx" (DMA3 channel
is not used in this FE-BE case).    When FE-BE startup, DMA2
channel is created, it needs the ESAI's "dma:tx", so the warning
comes out.

best regards
wang shengjiu