linux-kernel - [PATCH v2 4/7] [media] uvcvideo: Enable runtime PM of descendant devices

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Date:	Fri,  3 Apr 2015 14:57:53 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-pm@...r.kernel.org
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/7] [media] uvcvideo: Enable runtime PM of descendant devices

So UVC devices can remain runtime-suspended when the system goes into a
sleep state, they and all of their descendant devices need to have
runtime PM enable.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---
 drivers/media/usb/uvc/uvc_driver.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index cf27006..687e5fb 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1855,6 +1855,15 @@ static int uvc_register_chains(struct uvc_device *dev)
 	return 0;
 }
 
+static int uvc_pm_runtime_enable(struct device *dev, void *data)
+{
+	pm_runtime_enable(dev);
+
+	device_for_each_child(dev, NULL, uvc_pm_runtime_enable);
+
+	return 0;
+}
+
 /* ------------------------------------------------------------------------
  * USB probe, disconnect, suspend and resume
  */
@@ -1959,6 +1968,8 @@ static int uvc_probe(struct usb_interface *intf,
 			"supported.\n", ret);
 	}
 
+	device_for_each_child(&dev->intf->dev, NULL, uvc_pm_runtime_enable);
+
 	uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
 	usb_enable_autosuspend(udev);
 	return 0;
-- 
2.3.4

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