Re: [PATCH 1/2] ASoC: Intel: sof_sdw: Fix DMI match for Lenovo 83LC

[Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>]

>>>> This laptop ships with a different DMI identifier to what was expected,
>>>> and also has the DMICs connected to the host rather than the cs42l43
>>>> codec.
>>>
>>> If the DMICs are connected to the host, isn't there NHLT information
>>> telling the OS how many dmics are connected? If yes, then the
>>> machine-level DMI quirk isn't really needed, all you would need is a
>>> rule that sets it unconditionally when mach->mach_params.dmic_num is
>>> non-zero
>>
>> That is a good idea. However, we also test the case where the PCH DMIC
>> and SoundWire DMIC coexist in the developing stage. Maybe use a quirk
>> for the different DMIC coexist case?
> 
> On second thought, we will eventually create the dai links by reading
> the SDCA functions and remove those DMI quirks. Not sure is it worth
> to change it or even add a new quirk just for temporary used?

If you have any NHLT information, that's a very strong sign that the platform does rely on PCH-connected DMICS.
If you don't then quirks are indeed needed to select PCH or codec-based solutions. I think it's fine to add such quirks for now, it'd be up to Cirrus to remove them later on when all the SDCA parsing is available, which could take a while.