linux-kernel - [PATCH 0/3] Allow specifying an S2RAM sleep on pre-SYSTEM

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Message-Id: <20241028-topic-cpu_suspend_s2ram-v1-0-9fdd9a04b75c@oss.qualcomm.com>
Date: Mon, 28 Oct 2024 15:22:56 +0100
From: Konrad Dybcio <konradybcio@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Mark Rutland <mark.rutland@....com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Bjorn Andersson <bjorn.andersson@....qualcomm.com>, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>, 
 Sudeep Holla <sudeep.holla@....com>, Konrad Dybcio <konradybcio@...nel.org>
Subject: [PATCH 0/3] Allow specifying an S2RAM sleep on pre-SYSTEM_SUSPEND
 PSCI impls

Certain firmwares expose exactly what PSCI_SYSTEM_SUSPEND does through
CPU_SUSPEND instead. Inform Linux about that.
Please see the commit messages for a more detailed explanation.

This is effectively a more educated follow-up to [1].

The ultimate goal is to stop making Linux think that certain states
only concern cores/clusters, and consequently setting
pm_set_suspend/resume_via_firmware(), so that client drivers (such as
NVMe, see related discussion over at [2]) can make informed decisions
about assuming the power state of the device they govern.

If this series gets green light, I'll push a follow-up one that wires
up said sleep state on Qualcomm SoCs across the board.

[1] https://lore.kernel.org/linux-arm-kernel/20231227-topic-psci_fw_sus-v1-0-6910add70bf3@linaro.org/
[2] https://lore.kernel.org/linux-nvme/20241024-topic-nvmequirk-v1-1-51249999d409@oss.qualcomm.com/

Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
Konrad Dybcio (3):
      dt-bindings: arm,psci: Allow S2RAM power_state parameter description
      firmware/psci: Set pm_set_resume/suspend_via_firmware() for SYSTEM_SUSPEND
      firmware/psci: Allow specifying an S2RAM state through CPU_SUSPEND

 Documentation/devicetree/bindings/arm/psci.yaml |  6 ++++
 drivers/firmware/psci/psci.c                    | 44 ++++++++++++++++++++++---
 2 files changed, 46 insertions(+), 4 deletions(-)
---
base-commit: a39230ecf6b3057f5897bc4744a790070cfbe7a8
change-id: 20241028-topic-cpu_suspend_s2ram-28fc095d0aa4

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@....qualcomm.com>