linux-kernel - [PATCH 1/2] firmware/psci: Set pm_set_resume/suspend_via_firmware() for SYSTEM

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Message-Id: <20231227-topic-psci_fw_sus-v1-1-6910add70bf3@linaro.org>
Date: Wed, 27 Dec 2023 23:15:30 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Mark Rutland <mark.rutland@....com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 1/2] firmware/psci: Set
 pm_set_resume/suspend_via_firmware() for SYSTEM_SUSPEND

Some device drivers are curious to know whether "the firmware" (which is
often assumed to be ACPI) takes care of suspending or resuming the
platform. Set the flag that reports this behavior if SYSTEM_SUSPEND is
implemented.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/firmware/psci/psci.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index d9629ff87861..1bcb752977b1 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -505,12 +505,22 @@ static int psci_system_suspend(unsigned long unused)
 
 static int psci_system_suspend_enter(suspend_state_t state)
 {
+	pm_set_resume_via_firmware();
+
 	return cpu_suspend(0, psci_system_suspend);
 }
 
+static int psci_system_suspend_begin(suspend_state_t state)
+{
+	pm_set_suspend_via_firmware();
+
+	return 0;
+}
+
 static const struct platform_suspend_ops psci_suspend_ops = {
 	.valid          = suspend_valid_only_mem,
 	.enter          = psci_system_suspend_enter,
+	.begin          = psci_system_suspend_begin,
 };
 
 static void __init psci_init_system_reset2(void)

-- 
2.43.0