linux-kernel - [PATCH v3 2/2] [media] uvcvideo: Remain runtime-suspended at sleeps

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Date:	Fri, 17 Apr 2015 17:24:50 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-pm@...r.kernel.org
Cc:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] [media] uvcvideo: Remain runtime-suspended at sleeps

When the system goes to sleep and afterwards resumes, a significant
amount of time is spent suspending and resuming devices that were
already runtime-suspended.

By setting the power.force_direct_complete flag, the PM core will ignore
the state of descendant devices and the device will be let in
runtime-suspend.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---
 drivers/media/usb/uvc/uvc_driver.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 5970dd6..ae75a70 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1945,6 +1945,8 @@ static int uvc_probe(struct usb_interface *intf,
 			"supported.\n", ret);
 	}
 
+	intf->dev.parent->power.force_direct_complete = true;
+
 	uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
 	usb_enable_autosuspend(udev);
 	return 0;
-- 
2.3.5

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