Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Sender: deesin=codeaurora.org@mg.codeaurora.org
DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org D9A08C4338F
From:   Deepak Kumar Singh <deesin@codeaurora.org>
To:     bjorn.andersson@linaro.org, swboyd@chromium.org,
        clew@codeaurora.org, sibis@codeaurora.org
Cc:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-remoteproc@vger.kernel.org,
        Deepak Kumar Singh <deesin@codeaurora.org>,
        Andy Gross <agross@kernel.org>
Subject: [PATCH V3 1/1] soc: qcom: smp2p: Add wakeup capability to SMP2P IRQ
Date:   Fri, 17 Sep 2021 22:01:28 +0530
Message-Id: <1631896288-17281-1-git-send-email-deesin@codeaurora.org>
Precedence: bulk

Remote susbsystems notify fatal crash throught smp2p interrupt.
When remoteproc crashes it can cause soc to come out of low power
state and may not allow again to enter in low power state until
crash is handled.

Mark smp2p interrupt wakeup capable so that interrupt handler is
executed and remoteproc crash can be handled in system  resume path.
This patch marks interrupt wakeup capable but keeps wakeup disabled
by default and leaves it to user space to enable it according to its
requirement.

Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>
---
 drivers/soc/qcom/smp2p.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
index 2df4883..5f8ba96 100644
--- a/drivers/soc/qcom/smp2p.c
+++ b/drivers/soc/qcom/smp2p.c
@@ -14,6 +14,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/regmap.h>
 #include <linux/soc/qcom/smem.h>
 #include <linux/soc/qcom/smem_state.h>
@@ -538,9 +539,26 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
 		goto unwind_interfaces;
 	}
 
+	/*
+	 * Treat smp2p interrupt as wakeup source, but keep it disabled
+	 * by default. User space can decide enabling it depending on its
+	 * use cases. For example if remoteproc crashes and device wants
+	 * to handle it immediatedly (e.g. to not miss phone calls) it can
+	 * enable wakeup source from user space, while other devices which
+	 * do not have proper autosleep feature may want to handle it with
+	 * other wakeup events (e.g. Power button) instead waking up immediately.
+	 */
+	device_set_wakeup_capable(&pdev->dev, true);
+
+	ret = dev_pm_set_wake_irq(&pdev->dev, irq);
+	if (ret)
+		set_wake_irq_fail;
 
 	return 0;
 
+set_wake_irq_fail:
+	dev_pm_clear_wake_irq(&pdev->dev);
+
 unwind_interfaces:
 	list_for_each_entry(entry, &smp2p->inbound, node)
 		irq_domain_remove(entry->domain);
@@ -565,6 +583,9 @@ static int qcom_smp2p_remove(struct platform_device *pdev)
 	struct qcom_smp2p *smp2p = platform_get_drvdata(pdev);
 	struct smp2p_entry *entry;
 
+	dev_pm_clear_wake_irq(&pdev->dev);
+	device_init_wakeup(&pdev->dev, false);
+
 	list_for_each_entry(entry, &smp2p->inbound, node)
 		irq_domain_remove(entry->domain);
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project