Re: [PATCH] soc: qcom: mark pd-mapper as broken

[Johan Hovold <johan@kernel.org>]

On Thu, Oct 10, 2024 at 12:55:48PM +0300, Dmitry Baryshkov wrote:
> On Thu, 10 Oct 2024 at 10:44, Johan Hovold <johan+linaro@kernel.org> wrote:
> >
> > When using the in-kernel pd-mapper on x1e80100, client drivers often
> > fail to communicate with the firmware during boot, which specifically
> > breaks battery and USB-C altmode notifications. This has been observed
> > to happen on almost every second boot (41%) but likely depends on probe
> > order:
> >
> >     pmic_glink_altmode.pmic_glink_altmode pmic_glink.altmode.0: failed to send altmode request: 0x10 (-125)
> >     pmic_glink_altmode.pmic_glink_altmode pmic_glink.altmode.0: failed to request altmode notifications: -125
> >
> >     ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to send UCSI read request: -125
> >
> >     qcom_battmgr.pmic_glink_power_supply pmic_glink.power-supply.0: failed to request power notifications
> >
> > In the same setup audio also fails to probe albeit much more rarely:
> >
> >     PDR: avs/audio get domain list txn wait failed: -110
> >     PDR: service lookup for avs/audio failed: -110
> >
> > Chris Lew has provided an analysis and is working on a fix for the
> > ECANCELED (125) errors, but it is not yet clear whether this will also
> > address the audio regression.
> >
> > Even if this was first observed on x1e80100 there is currently no reason
> > to believe that these issues are specific to that platform.
> >
> > Disable the in-kernel pd-mapper for now, and make sure to backport this
> > to stable to prevent users and distros from migrating away from the
> > user-space service.
> >
> > Fixes: 1ebcde047c54 ("soc: qcom: add pd-mapper implementation")
> > Cc: stable@vger.kernel.org      # 6.11
> > Link: https://lore.kernel.org/lkml/Zqet8iInnDhnxkT9@hovoldconsulting.com/
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> 
> Please don't break what is working. pd_mapper is working on all
> previous platforms. I suggest reverting commit bd6db1f1486e ("soc:
> qcom: pd_mapper: Add X1E80100") instead.

As I tried to explain in the commit message, there is currently nothing
indicating that these issues are specific to x1e80100 (even if you may
not hit them in your setup depending on things like probe order).

Let's disable it until the underlying bugs have been addressed.

Johan