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From 80f9e75b2fce22552fdf56ade990f3f98567e29e Mon Sep 17 00:00:00 2001
From: Maxime Jourdan <mjourdan@baylibre.com>
Date: Thu, 4 Oct 2018 15:37:39 +0200
Subject: [PATCH] media: videodev2: add V4L2_FMT_FLAG_NO_SOURCE_CHANGE
When a v4l2 driver exposes V4L2_EVENT_SOURCE_CHANGE, some (usually
OUTPUT) formats may not be able to trigger this event.
Add a enum_fmt format flag to tag those specific formats.
Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
---
Documentation/media/uapi/v4l/vidioc-enum-fmt.rst | 5 +++++
include/uapi/linux/videodev2.h | 5 +++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
index 019c513..e0040b3 100644
--- a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
+++ b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
@@ -116,6 +116,11 @@ one until ``EINVAL`` is returned.
- This format is not native to the device but emulated through
software (usually libv4l2), where possible try to use a native
format instead for better performance.
+ * - ``V4L2_FMT_FLAG_NO_SOURCE_CHANGE``
+ - 0x0004
+ - The event ``V4L2_EVENT_SOURCE_CHANGE`` is not supported
+ for this format.
+
Return Value
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1aae2e4..f44bdef 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -733,8 +733,9 @@ struct v4l2_fmtdesc {
__u32 reserved[4];
};
-#define V4L2_FMT_FLAG_COMPRESSED 0x0001
-#define V4L2_FMT_FLAG_EMULATED 0x0002
+#define V4L2_FMT_FLAG_COMPRESSED 0x0001
+#define V4L2_FMT_FLAG_EMULATED 0x0002
+#define V4L2_FMT_FLAG_NO_SOURCE_CHANGE 0x0004
/* Frame Size and frame rate enumeration */
/*
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