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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When testing on i.MX95, two consecutive suspend message send to the Linux agent, Linux will suspend(by the 1st suspend message) and wake up(by the 2nd suspend message). The ARM SCMI spec does not allow for filtering of which messages an agent wants to get on the system power protocol. To i.MX95, as we use mailbox to receive message, and the mailbox supports wake up, so linux will also get a repeated suspend message. This will cause Linux to wake (and should then go back into suspend). This patchset is to make the 2nd suspend message could suspend linux again. So why SCMI fireware couldn't block the 2nd suspend message from being sent to Linux agent? Per checking with our SCMI firmware owner: The SM(System Manager) does not know exactly when Linux is in suspend. There are no handshakes that clearly tell the SM this. The flow should be, if in suspend and you send a suspend (or graceful reset/power off) it will wake and then do the request action Move information could be found in patch 2 commit log Signed-off-by: Peng Fan --- Peng Fan (2): firmware: arm_scmi: bus: Add pm ops firmware: arm_scmi: power_control: Set SCMI_SYSPOWER_IDLE in pm resume drivers/firmware/arm_scmi/bus.c | 45 ++++++++++++++++++++++++++ drivers/firmware/arm_scmi/scmi_power_control.c | 24 +++++++++++--- 2 files changed, 64 insertions(+), 5 deletions(-) --- base-commit: 4325743c7e209ae7845293679a4de94b969f2bef change-id: 20250620-scmi-pm-8f6170769230 Best regards, -- Peng Fan