Re: [PATCH 5/6] ASoC: samsung: fix Kconfig dependencies

From: Arnd Bergmann
Date: Sun Oct 02 2011 - 17:16:03 EST

On Sunday 02 October 2011 21:47:30 Mark Brown wrote:
> On Sun, Oct 02, 2011 at 10:28:03PM +0200, Arnd Bergmann wrote:
> > config SND_SAMSUNG_AC97
> > tristate
> > select SND_SOC_AC97_BUS
> No, I'm not sure what the problem you're trying to fix here but this
> looks pretty terrible. SND_SOC_ALL_CODECS is a debugging tool for build
> coverage, we shouldn't be restricting actual useful drivers based on it.
> What is the intention of this change and why does it only apply to the
> Samsung platform? It all looks very magic.

It's a bug that I only observed on exynos4, and it could be that
this patch didn't actually solve it in the end. I'll drop it for
now and do a better report when the problem comes back.

I remember that I never fully understood what was going on either,
and I suspected a problem with Kconfig resulting in some builtin
ac97 code referencing symbols that are enabled in a module when

> > config SND_SOC_SAMSUNG_SMDK_WM8994
> > tristate "SoC I2S Audio support for WM8994 on SMDK"
> > depends on SND_SOC_SAMSUNG && (MACH_SMDKV310 || MACH_SMDKC210)
> > + depends on MFD_WM8994
> > select SND_SOC_WM8994
> This is non-idiomatic - we always select the CODEC drivers rather than
> depending on them for usability.

Ok. I did this patch before the MFD_SUPPORT option was removed, so I did
not want to add both 'select MFD_WM8994' and 'select MFD_SUPPORT' here.

So should SND_SOC_WM8994 instead select MFD_WM8994? That would mean adding
the select only in one place.


ASoC: codecs: SND_SOC_WM8994 requires MFD_WM8994

The samsung SMDK platform can select SND_SOC_WM8994 while the
necessary MFD driver is not present. Always select MFD_WM8994
now in order to satisfy the build dependencies.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 4d41447..b7b9ddc 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -92,7 +92,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_WM8990 if I2C
select SND_SOC_WM8991 if I2C
select SND_SOC_WM8993 if I2C
- select SND_SOC_WM8994 if MFD_WM8994
+ select SND_SOC_WM8994
select SND_SOC_WM8995 if SND_SOC_I2C_AND_SPI
select SND_SOC_WM8996 if I2C
select SND_SOC_WM9081 if I2C
@@ -373,6 +373,7 @@ config SND_SOC_WM8993

config SND_SOC_WM8994
+ select MFD_WM8994

config SND_SOC_WM8995
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