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

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Date:	Tue, 19 Aug 2014 15:41:07 +0800
From:	Shengjiu Wang <shengjiu.wang@...escale.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
CC:	<lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
	<tiwai@...e.de>, <nicoleotsuka@...il.com>,
	<Li.Xiubo@...escale.com>, <shc_work@...l.ru>,
	<fabio.estevam@...escale.com>, <xobs@...agi.com>, <arnd@...db.de>,
	<sfr@...b.auug.org.au>, <timur@...i.org>,
	<alsa-devel@...a-project.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
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:
> 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 <fengguang.wu@...el.com>
> >Signed-off-by: Shengjiu Wang <shengjiu.wang@...escale.com>
> 
> 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
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