linux-kernel - Re: [PATCH] ASoC: atmel: fix atmel_ssc_set

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Date:   Tue, 1 Oct 2019 16:56:56 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Mark Brown <broonie@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: atmel: fix atmel_ssc_set_audio link failure

On Tue, Oct 01, 2019 at 04:20:55PM +0200, Arnd Bergmann wrote:
> The ssc audio driver can call into both pdc and dma backends.  With the
> latest rework, the logic to do this in a safe way avoiding link errors
> was removed, bringing back link errors that were fixed long ago in commit
> 061981ff8cc8 ("ASoC: atmel: properly select dma driver state") such as
> 
> sound/soc/atmel/atmel_ssc_dai.o: In function `atmel_ssc_set_audio':
> atmel_ssc_dai.c:(.text+0xac): undefined reference to `atmel_pcm_pdc_platform_register'
> 
> Fix it this time using Makefile hacks and a comment to prevent this
> from accidentally getting removed again rather than Kconfig hacks.
> 
> Fixes: 18291410557f ("ASoC: atmel: enable SOC_SSC_PDC and SOC_SSC_DMA in Kconfig")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  sound/soc/atmel/Kconfig  |  4 ++--
>  sound/soc/atmel/Makefile | 10 ++++++++--
>  2 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
> index f118c229ed82..25c31bf64936 100644
> --- a/sound/soc/atmel/Kconfig
> +++ b/sound/soc/atmel/Kconfig
> @@ -10,11 +10,11 @@ config SND_ATMEL_SOC
>  if SND_ATMEL_SOC
>  
>  config SND_ATMEL_SOC_PDC
> -	tristate
> +	bool
>  	depends on HAS_DMA
>  
>  config SND_ATMEL_SOC_DMA
> -	tristate
> +	bool
>  	select SND_SOC_GENERIC_DMAENGINE_PCM
>  
>  config SND_ATMEL_SOC_SSC
> diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
> index 1f6890ed3738..c7d2989791be 100644
> --- a/sound/soc/atmel/Makefile
> +++ b/sound/soc/atmel/Makefile
> @@ -6,8 +6,14 @@ snd-soc-atmel_ssc_dai-objs := atmel_ssc_dai.o
>  snd-soc-atmel-i2s-objs := atmel-i2s.o
>  snd-soc-mchp-i2s-mcc-objs := mchp-i2s-mcc.o
>  
> -obj-$(CONFIG_SND_ATMEL_SOC_PDC) += snd-soc-atmel-pcm-pdc.o
> -obj-$(CONFIG_SND_ATMEL_SOC_DMA) += snd-soc-atmel-pcm-dma.o
> +# pdc and dma need to both be built-in if any user of
> +# ssc is built-in.
> +ifdef CONFIG_SND_ATMEL_SOC_PDC
> +obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel-pcm-pdc.o
> +endif
> +ifdef CONFIG_SND_ATMEL_SOC_DMA
> +obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel-pcm-dma.o
> +endif
>  obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o
>  obj-$(CONFIG_SND_ATMEL_SOC_I2S) += snd-soc-atmel-i2s.o
>  obj-$(CONFIG_SND_MCHP_SOC_I2S_MCC) += snd-soc-mchp-i2s-mcc.o

I was just exploring similar solution, using $(if X,Y) instead, but your
fix will work just as well.

Reviewed-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>

Best Regards,
Michał Mirosław