[PATCH v9 13/15] v4l: introduce the fences capability

Ezequiel Garcia
2018-05-04T20:09:55Z

From: Gustavo Padovan <gustavo.padovan@collabora.com>

Drivers capable of using fences (vb2 drivers) should report the
V4L2_CAP_FENCES to userspace, so add this flag to the uapi.

v2: minor doc/english fix (Hans Verkuil)

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
---
Documentation/media/uapi/v4l/vidioc-querycap.rst | 3 +++
include/uapi/linux/videodev2.h | 1 +
2 files changed, 4 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst b/Documentation/media/uapi/v4l/vidioc-querycap.rst
index 66fb1b3d6e6e..df3ad57f07a3 100644
--- a/Documentation/media/uapi/v4l/vidioc-querycap.rst
+++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst
@@ -254,6 +254,9 @@ specification the ioctl returns an ``EINVAL`` error code.
* - ``V4L2_CAP_TOUCH``
- 0x10000000
- This is a touch device.
+ * - ``V4L2_CAP_FENCES``
+ - 0x20000000
+ - The device supports explicit synchronization.
* - ``V4L2_CAP_DEVICE_CAPS``
- 0x80000000
- The driver fills the ``device_caps`` field. This capability can
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1f18dc68ecab..cab35fca7c7f 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -460,6 +460,7 @@ struct v4l2_capability {
#define V4L2_CAP_STREAMING 0x04000000 /* streaming I/O ioctls */

#define V4L2_CAP_TOUCH 0x10000000 /* Is a touch device */
+#define V4L2_CAP_FENCES 0x20000000 /* Supports explicit synchronization */

#define V4L2_CAP_DEVICE_CAPS 0x80000000 /* sets device capabilities field */

--
2.16.3