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

[Georgi Djakov <djakov@kernel.org>]

On 9/21/26 11:47 PM, Marc Zyngier wrote:
> On Tue, 15 Sep 2026 13:37:03 +0100,
> Marc Zyngier <maz@kernel.org> 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@google.com
>> Link: https://lore.kernel.org/all/86ld9d4h4n.wl-maz@kernel.org
>> Signed-off-by: Marc Zyngier <maz@kernel.org>
>> Cc: Georgi Djakov <djakov@kernel.org>
>> Cc: Raviteja Laggyshetty <raviteja.laggyshetty@oss.qualcomm.com>
>> Cc: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
>> Cc: Abel Vesa <abelvesa@kernel.org>
>> Cc: Bjorn Andersson <andersson@kernel.org>
>> Cc: Mostafa Saleh <smostafa@google.com>
>> Cc: Thorsten Leemhuis <regressions@leemhuis.info>
>> ---
>>   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