Re: [alsa-devel] [PATCH V1 1/3] ASoC: fsl: Kconfig: remove dependence of SND_IMX_SOC for SND_SOC_IMX_PCM_DMA

On Tue, Aug 19, 2014 at 04:13:15PM +0800, Xiubo Li-B47053 wrote:

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Subject: Re: [alsa-devel] [PATCH V1 1/3] ASoC: fsl: Kconfig: remove dependence
of SND_IMX_SOC for SND_SOC_IMX_PCM_DMA

On Mon, Aug 18, 2014 at 06:52:46PM +0200, Lars-Peter Clausen wrote:

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On 08/18/2014 10:38 AM, Shengjiu Wang wrote:

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Build kernel with SND_SOC_IMC_PCM_DMA=m && SND_IMX_SOC=n leads the

following

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error:

   sound/built-in.o: In function `fsl_sai_probe':

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fsl_sai.c:(.text+0x5f662): undefined reference to `imx_pcm_dma_init'

   sound/built-in.o: In function `fsl_esai_probe':

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fsl_esai.c:(.text+0x6044b): undefined reference to `imx_pcm_dma_init'

Most cpu driver in soc/fsl has use the function 'imx_pcm_dma_init' which is
defined in imx-pcm-dma.c, so need to select SND_SOC_IMX_PCM_DMA, but it

depends

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on SND_IMX_SOC, if SND_IMX_SOC=n, then SND_SOC_IMX_PCM_DMA will not be
selected.
So remove the dependence of SND_IMX_SOC for SND_SOC_IMX_PCM_DMA.

Reported-by: kbuild test robot <redacted>
Signed-off-by: Shengjiu Wang <redacted>

Those if conditions where just added[1] by Arnd to avoid other build
failures. So just removing them again makes little sense.

As far as I can see imx_pcm_dma_init() should be stubbed out when
SND_SOC_IMX_PCM_DMA is not selected. So what's going on here?

[1]

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ff40
260f79dc0436604452bccd449bffd25ebafb

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Lars-Peter Clausen & Arnd

The purpose of Arnd's patch is same with me, which is to resolve the build
error when SND_SOC_IMX_PCM_DMA=m & SND_SOC_FSL_SSI/SAI/ESAI/SPDIF=y, the
error is "undefined reference to `imx_pcm_dma_init'".
But Arnd's patch didn't involve this situation that SND_IMX_SOC=n &
SND_SOC_IMX_PCM_DMA=m.

Currently I think out a solution for this issue is to change

select SND_SOC_IMX_PCM_DMA if SND_IMX_SOC != n

to

depends on SND_SOC_IMX_PCM_DMA != m

How do you think about this?

What will happen if to build both SAI/ESAI and IMX_PCM_DMA as modules at the same
time ?

Thanks,

BRs
Xiubo

I didn't find error/warning when SAI/ESAI and IMX_PCM_DMA are as modules. The 
build is successful.

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best regards
Wang shengjiu