linux-kernel - [PATCH v2 2/5] media: cadence: csi2rx: Add system PM support

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Message-Id: <20240718032834.53876-3-changhuang.liang@starfivetech.com>
Date: Wed, 17 Jul 2024 20:28:31 -0700
From: Changhuang Liang <changhuang.liang@...rfivetech.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Maxime Ripard <mripard@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hans Verkuil <hverkuil-cisco@...all.nl>
Cc: Jacopo Mondi <jacopo.mondi@...asonboard.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
	Jack Zhu <jack.zhu@...rfivetech.com>,
	Keith Zhao <keith.zhao@...rfivetech.com>,
	Changhuang Liang <changhuang.liang@...rfivetech.com>,
	Jayshri Pawar <jpawar@...ence.com>,
	Jai Luthra <j-luthra@...com>,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-staging@...ts.linux.dev
Subject: [PATCH v2 2/5] media: cadence: csi2rx: Add system PM support

Add system PM support make it stopping streaming at system suspend time,
and restarting streaming at system resume time.

Signed-off-by: Changhuang Liang <changhuang.liang@...rfivetech.com>
---
 drivers/media/platform/cadence/cdns-csi2rx.c | 32 ++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index 981819adbb3a..81e90b31e9f8 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -776,8 +776,40 @@ static int csi2rx_runtime_resume(struct device *dev)
 	return ret;
 }
 
+static int __maybe_unused csi2rx_suspend(struct device *dev)
+{
+	struct csi2rx_priv *csi2rx = dev_get_drvdata(dev);
+
+	mutex_lock(&csi2rx->lock);
+	if (csi2rx->count)
+		csi2rx_stop(csi2rx);
+	mutex_unlock(&csi2rx->lock);
+
+	pm_runtime_force_suspend(dev);
+
+	return 0;
+}
+
+static int __maybe_unused csi2rx_resume(struct device *dev)
+{
+	struct csi2rx_priv *csi2rx = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pm_runtime_force_resume(dev);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&csi2rx->lock);
+	if (csi2rx->count)
+		csi2rx_start(csi2rx);
+	mutex_unlock(&csi2rx->lock);
+
+	return 0;
+}
+
 static const struct dev_pm_ops csi2rx_pm_ops = {
 	SET_RUNTIME_PM_OPS(csi2rx_runtime_suspend, csi2rx_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(csi2rx_suspend, csi2rx_resume)
 };
 
 static const struct of_device_id csi2rx_of_table[] = {
-- 
2.25.1