[alsa-devel] [PATCH] ASoC: Intel: hdac_hdmi: add Icelake support

[Takashi Iwai]

On Wed, 14 Nov 2018 15:53:23 +0100,
Takashi Iwai wrote:
> 
> On Mon, 12 Nov 2018 15:00:36 +0100,
> Pierre-Louis Bossart wrote:
> > 
> > And btw the big topic is still how we provide distributions the means
> > to handle a 'graceful' fallback from DSP-enabled solutions (SST or
> > SOF) to legacy HDAudio, it's already popped up for cases where we have
> > HDaudio solutions with DMICs.
> 
> Yeah, that's a long-standing problem.  I've experimented some
> scenarios in the past, and the conclusion is that there is no really
> working fallback mechanism in general in Linux driver binding.
> That is, the only reasonable way seems to make a dedicated driver for
> the specific PCI ID (SKL+) doing the probe-and-fallback by itself,
> while excluding these IDs from other existing driver entries.
> 
> I'd love to proceed this but unfortunately I have no machine that can
> run SKL+ SST driver right now.  I have a new CFL devel box, but it has
> no support (PCI ID 8086:a348) as well as no firmware...

So, with a working machine, I could finally hack this a bit.
Below is a freshly cooked patch(set).  The first one is just to add
the support for my CFL machine, and another one is to add the fallback
binding with the legacy HD-audio on snd-soc-skl.

The changes aren't that big.  And you can still control the binding
via a module option, e.g. snd_soc_skl.legacy=1 will let it bound only
with the legacy driver, snd_soc_skl.legacy=2 for ASoC only.  The
default is 0, the fallback to legacy if ASoC binding fails.

It's still a PoC, no proper patch description is put yet.

Comments / suggestions appreciated.


thanks,

Takashi

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