[Sound-open-firmware] SoF support for 8086:9d71?

[Pierre-Louis Bossart]

> On more recent kernels legacy HDA stops working for device 8086:9d71:
> [   47.211381] snd_hda_intel 0000:00:1f.3: DSP detected with PCI 
> class/subclass/prog-if info 0x040100
> [   47.211383] snd_hda_intel 0000:00:1f.3: Digital mics found on 
> Skylake+ platform, using SST driver
> 
> However, only legacy HDA supports it:
> 00:1f.3 Multimedia audio controller [0401]: Intel Corporation Sunrise 
> Point-LP HD Audio [8086:9d71] (rev 21)
> ..
>      Kernel modules: snd_hda_intel
> 
> Ubuntu kernel doesn't select SND_SOC_INTEL_SKYLAKE, which builds 
> snd-soc-skl, because based on the Kconfig description SOF should support 
> it.
> 
> I wonder if SND_SOC_INTEL_SKYLAKE should be select again?

SOF does not support Skylake and Kabylake, and only the Up2 board for 
APL. I am not sure what you mean by 'recent' kernels since this dynamic 
selection has been in place for a year now?

At any rate, to make this work again:

1. You can select SND_SOC_INTEL_SKYLAKE or alternatively to be more 
accurate:

SND_SOC_INTEL_SKL
SND_SOC_INTEL_APL
SND_SOC_INTEL_KBL

There are known issues with Conexant codecs, typically on HP devices, 
only Realtek codecs are supported.

2. In addition you will need to have the topology for SKL/KBL w/ HDaudio 
codecs. It's in alsa-topology-conf but would need to be compiled and 
installed.

3. UCM files should be already handled in alsa-ucm-conf	

Hope this helps
-Pierre