Re: [PATCH v3 3/4] arm64: dts: qcom: msm8917: Use a shallower cluster state to fix unresponsive idle

[Konrad Dybcio]

On 10/22/26 11:41 AM, Reza Kurniawan wrote:
> MSM8917 is a single cluster SoC, so powering down the cluster means
> powering down the whole system. This causes two problems:
> 
> 1. The system becomes unresponsive, even to common interrupts. Waking it
>    requires an interrupt from the MPM (MSM Power Manager) or scheduling
>    the MPM to wake the system later. Linux currently has no way of doing
>    the latter, so the cluster may never resume operation.
> 
> 2. Entering power collapse blanks the screen. When the state is entered
>    and exited repeatedly, this shows up as visible flicker.
> 
> Even if MPM scheduling were implemented, the second problem would remain
> and it wouldn't fix the system being unresponsive at idle.
> 
> Replace the idle state with PSCI mode 4 (dubbed GDHS downstream), which
> is less aggressive and can wake up from conventional interrupt sources.
> 
> Signed-off-by: Reza Kurniawan <imkyufie@xxxxxxxxx>
> ---


https://lore.kernel.org/lkml/20261005-s2idle_state-v1-0-3c402c66f388@xxxxxxxxxxxxxxxx/

and

https://lore.kernel.org/lkml/20261015-b4-shikra_lpm_addition-v2-0-ac7f1a0d5638@xxxxxxxxxxxxxxxx/

are in flight, you may want to integrate/test them locally!

Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>

Konrad