Re: ASoC: cs42l43: SDCA reattach timeout on Dell XPS 14 Panther Lake; chip stuck across distros and kernels; worked initially; still working at hardware level

[Charles Keepax <ckeepax@opensource.cirrus.com>]

On Thu, May 07, 2026 at 02:32:21PM +0200, Tobias Bachmann wrote:
> thank you for picking this up so quickly, much appreciated.

No problem :-)

> On Thur, May 07, 2026, 11:20:52 CEST, Charles Keepax wrote:
> Does this mean faulty hardware is the most likely option? This laptop
> is barely a week old. Or is it possible the driver left the chip in a non-
> working (but potentially recoverable) state?

Yeah I am afraid this looks like a hardware problem, enumerating
on the SoundWire bus is pretty much only dependant on power
rails.

As you say there is a tiny hope the device has got into a weird
state but isn't reset on a reboot. However, given it looks from
the log like the amps were reset:

[   14.603448] cs35l56 sdw:0:2:01fa:3557:01:2: Cirrus Logic CS35L57 Rev B2 OTP1 fw:4.2.1 (patched=0)

That patched=0 means the firmware has been wiped and that only
happens on a reset and as far as I know the resets are tied
together on this model. The very very long shot would be to let
the battery run down and leave the device for a bit to try and
super make sure the power rails went down which would also fully
reset the device. But it is definitely a long shot.

Thanks,
Charles