linux-kernel - [PATCH v2 09/20] media: i2c: ov4689: Use runtime PM autosuspend

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Message-ID: <20231218174042.794012-10-mike.rudenko@gmail.com>
Date: Mon, 18 Dec 2023 20:40:30 +0300
From: Mikhail Rudenko <mike.rudenko@...il.com>
To: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Jacopo Mondi <jacopo@...ndi.org>,
	Tommaso Merciai <tomm.merciai@...il.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Mikhail Rudenko <mike.rudenko@...il.com>
Subject: [PATCH v2 09/20] media: i2c: ov4689: Use runtime PM autosuspend

Use runtime PM autosuspend to avoid powering off the sensor during
fast stop-reconfigure-restart cycles.

Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>
---
 drivers/media/i2c/ov4689.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
index 5300e621ff90..64cc6d9e48cc 100644
--- a/drivers/media/i2c/ov4689.c
+++ b/drivers/media/i2c/ov4689.c
@@ -407,26 +407,27 @@ static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
 					  ov4689->cur_mode->num_regs,
 					  NULL);
 		if (ret) {
-			pm_runtime_put(dev);
+			pm_runtime_put_sync(dev);
 			goto unlock_and_return;
 		}
 
 		ret = __v4l2_ctrl_handler_setup(&ov4689->ctrl_handler);
 		if (ret) {
-			pm_runtime_put(dev);
+			pm_runtime_put_sync(dev);
 			goto unlock_and_return;
 		}
 
 		ret = cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
 				OV4689_MODE_STREAMING, NULL);
 		if (ret) {
-			pm_runtime_put(dev);
+			pm_runtime_put_sync(dev);
 			goto unlock_and_return;
 		}
 	} else {
 		cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
 			  OV4689_MODE_SW_STANDBY, NULL);
-		pm_runtime_put(dev);
+		pm_runtime_mark_last_busy(dev);
+		pm_runtime_put_autosuspend(dev);
 	}
 
 unlock_and_return:
@@ -606,7 +607,9 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
 		break;
 	}
 
-	pm_runtime_put(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
 	return ret;
 }
 
@@ -877,8 +880,10 @@ static int ov4689_probe(struct i2c_client *client)
 	}
 
 	pm_runtime_set_active(dev);
+	pm_runtime_get_noresume(dev);
 	pm_runtime_enable(dev);
-	pm_runtime_idle(dev);
+	pm_runtime_set_autosuspend_delay(dev, 1000);
+	pm_runtime_use_autosuspend(dev);
 
 	ret = v4l2_async_register_subdev_sensor(sd);
 	if (ret) {
@@ -886,11 +891,14 @@ static int ov4689_probe(struct i2c_client *client)
 		goto err_clean_subdev_pm;
 	}
 
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
 	return 0;
 
 err_clean_subdev_pm:
 	pm_runtime_disable(dev);
-	pm_runtime_set_suspended(dev);
+	pm_runtime_put_noidle(dev);
 	v4l2_subdev_cleanup(sd);
 err_clean_entity:
 	media_entity_cleanup(&sd->entity);
-- 
2.43.0