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

From: Shengjiu Wang <[email-masked]>
Date: Tue, 19 Aug 2014 15:41:07 +0800

On Mon, Aug 18, 2014 at 06:52:46PM +0200, Lars-Peter Clausen wrote:
> On 08/18/2014 10:38 AM, Shengjiu Wang wrote:
> >Build kernel with SND_SOC_IMC_PCM_DMA=m && SND_IMX_SOC=n leads the following
> >error:
> >
> >    sound/built-in.o: In function `fsl_sai_probe':
> >>>fsl_sai.c:(.text+0x5f662): undefined reference to `imx_pcm_dma_init'
> >    sound/built-in.o: In function `fsl_esai_probe':
> >>>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
> >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 <[email-masked]>
> >Signed-off-by: Shengjiu Wang <[email-masked]>
> 
> 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=ff40260f79dc0436604452bccd449bffd25ebafb
>
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?

best regards
Wang shengjiu