Re: [PATCH] Revert "interconnect: qcom: x1e80100: enable QoS configuration"

[Georgi Djakov]

On 9/21/26 11:47 PM, Marc Zyngier wrote:
> On Tue, 15 Sep 2026 13:37:03 +0100,
> Marc Zyngier <maz@xxxxxxxxxx> wrote:
> > This reverts commit 5a8b2cc36e796d595c9d97eab23c2be22805cc1c.
> >
> > Since the introduction of this QoS change, X1 machines based on the
> > Purwa SoC (such as the Lenovo Mini X) take a hard reset at boot time.
> >
> > Other machines based on Hamoa (such as the X1E001DE Snapdragon Devkit)
> > end-up with a similar hard reset while under load, most likely due to
> > the PCIe ports being starved of traffic.
> >
> > Revert the whole thing until someone figures out what magic parameters
> > allow QoS to work in a sensible manner, as a usable machine is somehow
> > preferable to one that crashes efficiently.
> >
> > Link: https://lore.kernel.org/all/apgeBNSiP01YfNcs@xxxxxxxxxx
> > Link: https://lore.kernel.org/all/86ld9d4h4n.wl-maz@xxxxxxxxxx
> > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> > Cc: Georgi Djakov <djakov@xxxxxxxxxx>
> > Cc: Raviteja Laggyshetty <raviteja.laggyshetty@xxxxxxxxxxxxxxxx>
> > Cc: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> > Cc: Abel Vesa <abelvesa@xxxxxxxxxx>
> > Cc: Bjorn Andersson <andersson@xxxxxxxxxx>
> > Cc: Mostafa Saleh <smostafa@xxxxxxxxxx>
> > Cc: Thorsten Leemhuis <regressions@xxxxxxxxxxxxx>
> > ---
> >   drivers/interconnect/qcom/x1e80100.c | 485 ---------------------------
> >   1 file changed, 485 deletions(-)
>
> Any update on applying this? These machines have been broken for the
> past 4 release candidates, and it'd be great to get them back to a
> working state.
The revert is in linux-next already and i will propagate it as a fix in
a couple of days. Thank you for the report and for sending the patch!

BR,
Georgi