Commit 4fe27eb6 authored by Sowjanya Komatineni's avatar Sowjanya Komatineni Committed by Mauro Carvalho Chehab
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media: tegra-video: Implement V4L2 device notify callback 



Implement V4L2 device notify callback to handle
V4L2_EVENT_SOURCE_CHANGE event from subdevices.

HDMI-to-CSI bridge drivers trigger V4L2_EVENT_SOURCE_CHANGE when
source DV timing changes are detected or when HDMI hotplug happens.

Runtime source parameter changes during active streaming is not
allowed and Tegra video driver calls vb2_queue_error to signal a
fatal error if a notification of this event happens during an active
streaming.

Signed-off-by: default avatarSowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent 2be21e68

drivers/staging/media/tegra-video/vi.c

+3 −0
Original line number Diff line number Diff line
@@ -1636,6 +1636,9 @@ static int tegra_vi_graph_notify_complete(struct v4l2_async_notifier *notifier) 


	v4l2_set_subdev_hostdata(subdev, chan);



	subdev = tegra_channel_get_remote_source_subdev(chan);

	v4l2_set_subdev_hostdata(subdev, chan);



	return 0;



unregister_video:

drivers/staging/media/tegra-video/video.c

+18 −0
Original line number Diff line number Diff line
@@ -7,6 +7,8 @@ 
#include <linux/module.h>

#include <linux/platform_device.h>



#include <media/v4l2-event.h>



#include "video.h"



static void tegra_v4l2_dev_release(struct v4l2_device *v4l2_dev)
@@ -24,6 +26,21 @@ static void tegra_v4l2_dev_release(struct v4l2_device *v4l2_dev) 
	kfree(vid);

}



static void tegra_v4l2_dev_notify(struct v4l2_subdev *sd,

				  unsigned int notification, void *arg)

{

	struct tegra_vi_channel *chan;

	const struct v4l2_event *ev = arg;



	if (notification != V4L2_DEVICE_NOTIFY_EVENT)

		return;



	chan = v4l2_get_subdev_hostdata(sd);

	v4l2_event_queue(&chan->video, arg);

	if (ev->type == V4L2_EVENT_SOURCE_CHANGE && vb2_is_streaming(&chan->queue))

		vb2_queue_error(&chan->queue);

}



static int host1x_video_probe(struct host1x_device *dev)

{

	struct tegra_video_device *vid;
@@ -49,6 +66,7 @@ static int host1x_video_probe(struct host1x_device *dev) 


	vid->v4l2_dev.mdev = &vid->media_dev;

	vid->v4l2_dev.release = tegra_v4l2_dev_release;

	vid->v4l2_dev.notify = tegra_v4l2_dev_notify;

	ret = v4l2_device_register(&dev->dev, &vid->v4l2_dev);

	if (ret < 0) {

		dev_err(&dev->dev,