linux-kernel - [PATCH v2 2/2] remoteproc: core: Prevent sleep when rproc crashes

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Date:   Wed,  8 Apr 2020 15:18:25 -0700
From:   Siddharth Gupta <sidgup@...eaurora.org>
To:     bjorn.andersson@...aro.org, ohad@...ery.com
Cc:     Siddharth Gupta <sidgup@...eaurora.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, rishabhb@...eaurora.org
Subject: [PATCH v2 2/2] remoteproc: core: Prevent sleep when rproc crashes

Remoteproc recovery should be fast and any delay will have an impact on the
user-experience. Add a wakeup source to remoteproc which ensures that the
system does not go into idle state while a remoteproc is recovering, thus
prevent any delays that might occur during system resume.

Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
---
 drivers/remoteproc/qcom_q6v5_pas.c   | 1 +
 drivers/remoteproc/remoteproc_core.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index 7a63efb..6bb2c7d 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -401,6 +401,7 @@ static int adsp_probe(struct platform_device *pdev)
 
 	adsp = (struct qcom_adsp *)rproc->priv;
 	adsp->dev = &pdev->dev;
+	device_wakeup_enable(adsp->dev);
 	adsp->rproc = rproc;
 	adsp->pas_id = desc->pas_id;
 	adsp->has_aggre2_clk = desc->has_aggre2_clk;
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 9f99fe2..19a360d 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1729,6 +1729,8 @@ static void rproc_crash_handler_work(struct work_struct *work)
 
 	if (!rproc->recovery_disabled)
 		rproc_trigger_recovery(rproc);
+
+	pm_relax(rproc->dev.parent);
 }
 
 /**
@@ -2273,6 +2275,8 @@ void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
 		return;
 	}
 
+	pm_stay_awake(rproc->dev.parent);
+
 	dev_err(&rproc->dev, "crash detected in %s: type %s\n",
 		rproc->name, rproc_crash_to_string(type));
 
-- 
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