From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Reza Kurniawan <imkyufie@gmail.com>,
Mark Rutland <mark.rutland@arm.com>,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>, Ulf Hansson <ulfh@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Daniel Lezcano <daniel.lezcano@kernel.org>,
Christian Loehle <christian.loehle@arm.com>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Abel Vesa <abelvesa@kernel.org>, Val Packett <val@packett.cool>
Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v3 3/4] arm64: dts: qcom: msm8917: Use a shallower cluster state to fix unresponsive idle
Date: Thu, 22 Oct 2026 12:14:17 +0200 [thread overview]
Message-ID: <e0becea2-c5a1-46d4-932e-50517311fb96@oss.qualcomm.com> (raw)
In-Reply-To: <20261022-psci-fix-v3-3-9ce2133c5659@gmail.com>
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@gmail.com>
> ---
https://lore.kernel.org/lkml/20261005-s2idle_state-v1-0-3c402c66f388@oss.qualcomm.com/
and
https://lore.kernel.org/lkml/20261015-b4-shikra_lpm_addition-v2-0-ac7f1a0d5638@oss.qualcomm.com/
are in flight, you may want to integrate/test them locally!
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Konrad
next prev parent reply other threads:[~2026-10-22 10:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-22 9:41 [PATCH v3 0/4] Fix PSCI on MSM8917 and MSM8937 Reza Kurniawan
2026-10-22 9:41 ` [PATCH v3 1/4] dt-bindings: arm: psci: Add skip-suspend-mode-switch property Reza Kurniawan
2026-10-22 9:41 ` [PATCH v3 2/4] cpuidle: psci: Allow skipping the suspend mode switch Reza Kurniawan
2026-10-22 9:41 ` [PATCH v3 3/4] arm64: dts: qcom: msm8917: Use a shallower cluster state to fix unresponsive idle Reza Kurniawan
2026-10-22 10:14 ` Konrad Dybcio [this message]
2026-10-22 9:41 ` [PATCH v3 4/4] arm64: dts: qcom: Skip suspend mode switch on MSM8917 and MSM8937 Reza Kurniawan
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