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 08:13:15 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	"shengjiu.wang@...escale.com" <shengjiu.wang@...escale.com>,
	"Lars-Peter Clausen" <lars@...afoo.de>
CC:	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"perex@...ex.cz" <perex@...ex.cz>, "tiwai@...e.de" <tiwai@...e.de>,
	"nicoleotsuka@...il.com" <nicoleotsuka@...il.com>,
	"shc_work@...l.ru" <shc_work@...l.ru>,
	"Fabio.Estevam@...escale.com" <Fabio.Estevam@...escale.com>,
	"xobs@...agi.com" <xobs@...agi.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
	"timur@...i.org" <timur@...i.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.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

> 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=ff40
> 260f79dc0436604452bccd449bffd25ebafb
> >
> 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


> best regards
> Wang shengjiu
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