[PATCH 2/4] media: videobuf2: Add a transfer error event

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Add a new V4L2_EVENT_XFER_ERROR event to signal if a unrecoverable error
happens during video transfer.

The use-case that sparked this new event is to signal to the video
device driver that an error has happen on the CSI-2 bus from the CSI-2
receiver subdevice.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
 Documentation/userspace-api/media/v4l/vidioc-dqevent.rst     | 5 +++++
 Documentation/userspace-api/media/videodev2.h.rst.exceptions | 1 +
 include/uapi/linux/videodev2.h                               | 1 +
 3 files changed, 7 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst b/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
index 6eb40073c906deba..84984641c9351aa9 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
@@ -182,6 +182,11 @@ call.
 	the regions changes. This event has a struct
 	:c:type:`v4l2_event_motion_det`
 	associated with it.
+    * - ``V4L2_EVENT_XFER_ERROR``
+      - 7
+      - This event is triggered when an transfer error is detected while
+        streaming. For example if a unrecoverable error is detected on a video
+        bus in the pipeline.
     * - ``V4L2_EVENT_PRIVATE_START``
       - 0x08000000
       - Base event number for driver-private events.
diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
index eb0b1cd37abd9381..7ed9884b879c888e 100644
--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
@@ -498,6 +498,7 @@ replace define V4L2_EVENT_CTRL event-type
 replace define V4L2_EVENT_FRAME_SYNC event-type
 replace define V4L2_EVENT_SOURCE_CHANGE event-type
 replace define V4L2_EVENT_MOTION_DET event-type
+replace define V4L2_EVENT_XFER_ERROR event-type
 replace define V4L2_EVENT_PRIVATE_START event-type
 
 replace define V4L2_EVENT_CTRL_CH_VALUE ctrl-changes-flags
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index f118fe7a9f58d240..48d4738eb862418b 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -2373,6 +2373,7 @@ struct v4l2_streamparm {
 #define V4L2_EVENT_FRAME_SYNC			4
 #define V4L2_EVENT_SOURCE_CHANGE		5
 #define V4L2_EVENT_MOTION_DET			6
+#define V4L2_EVENT_XFER_ERROR			7
 #define V4L2_EVENT_PRIVATE_START		0x08000000
 
 /* Payload for V4L2_EVENT_VSYNC */
-- 
2.33.1




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