[alsa-devel] Bad rever-select of CONFIG_SND_HDA_I915

[Takashi Iwai]

On Fri, 18 Mar 2016 11:28:06 +0100,
Vinod Koul wrote:
> 
> On Fri, Mar 18, 2016 at 10:22:45AM +0100, Takashi Iwai wrote:
> > On Fri, 18 Mar 2016 09:06:49 +0100,
> > Vinod Koul wrote:
> > > 
> > > On Fri, Mar 18, 2016 at 08:34:49AM +0100, Takashi Iwai wrote:
> > > > Hi,
> > > > 
> > > > while build testing, I noticed the following warning:
> > > >   warning: (SND_SOC_INTEL_SKYLAKE) selects SND_HDA_I915 which has unmet direct dependencies (SOUND && !M68K && !UML && SND && DRM_I915 && SND_HDA_CORE)
> > > 
> > > Thanks Takashi for reporting,
> > > 
> > > > And it's indeed broken: you can't select CONFIG_SND_HDA_I915 from the
> > > > driver side.  This is the condition depending on DRM i915 driver.
> > > 
> > > But who selects CONFIG_SND_HDA_I915. It is a bool symbol, so someone needs
> > > to select it. I didn't see anyone select it, either from Gfx side or HDA
> > > side?
> > 
> > No, it's not a kconfig to be selected manually by others, but it
> > adjusts itself automatically depending on DRM_I915.  That is, it's a
> > read-only value.
> 
> Okay then
> 
> > > > Fixing this doesn't look too trivial, though.  Since
> > > > SND_SOC_INTEL_SKYLAKE is the item to be selected, it can't have
> > > > "depends on".  So, the top-level configs that select
> > > > SND_SOC_INTEL_SKYLAKE need to have "depends on DRM_I915" lines, or
> > > > modify the driver to be built without i915 binding.
> > > 
> > > can you please share the config where you saw this...
> > 
> > Just set DRM_I915=n and run config again on your machine.
> 
> Yes saw this now. I made depends on DRM_I915 to make it disappear.
 
OTOH, this makes impossible to use the driver without graphics, even
if you want only Realtek codec.

> I will check again for compilation fix and get back on proper patch either
> which depends on DRM or ensure we compile clean

I guess the build failure won't happen even if you rip off
SND_HDA_I915 dependency from SND_SOC_INTEL_SKYLAKE.  Let's check.


Takashi