5.14 regression, Intel SST (BYT) audio no longer works

[Hans de Goede]

Hi,

On 7/19/21 5:57 PM, Pierre-Louis Bossart wrote:
> 
>>> I just noticed and I won't have time to dig any deeper for approx. the
>>> coming 10 days. Still I wanted to report this in case anyone has any
>>> ideas. Or maybe you can reproduce and look for a fix ?
>>>
>>> After building + installing 5.14-rc1 on a HP Elitepad 1000 G2
>>> (Bay Trail) with a RT5642 codec, I noticed that sound over the
>>> speakers and over the docks line-out jack no longer works.
>>>
>>> Downgrading to 5.13 (without any other changes) fixes this, so this
>>> seems to be a regression with 5.14.
>>>
>>> I've no been able to make time to test this on other BYT/CHT hardware,
>>> but I suspect that other models will be affected too.
>>
>> Thanks Hans for the report, will look into this. 
>> I can't think of anything that might explain this regression.
>> I need to update the series to remove device properties so if the baseline is broken I'll see it as well...
> 
> I don't see any issues seen on a headless CHT Zotac device with RT5640, both with v5.14-rc1 or broonie/for-next.
> Maybe something else happening with e.g. ACPI or GPIOs?

I guess you tested with the SOF driver? I just tested and SOF
works fine in 5.14-rc#, but SST gives no sound. And we still
default to SST due to a couple of remaining SOF issues ...

I'm investigating this further now.

Regards,

Hans