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media: tegra-video: Implement V4L2 device notify callback

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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: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sowjanya Komatineni 2020-12-11 18:02:38 +01:00 committed by Mauro Carvalho Chehab
parent 2be21e6834
commit 4fe27eb68c
2 changed files with 21 additions and 0 deletions
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3
drivers/staging/media/tegra-video/vi.c
View File

@ -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:

18
drivers/staging/media/tegra-video/video.c
View File

@ -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,