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| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2022-10-09 23:35:09 +0200 |
|---|---|---|
| committer | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2022-11-04 16:56:46 +0100 |
| commit | d3fe5e6b3abfae9b08d80f9a635f1101491131f7 (patch) | |
| tree | c56b4e28a3291d0344f209e8497680a5e8eab61b /Documentation/userspace-api | |
| parent | media: platform: exynos4-is: fix return value check in fimc_md_probe() (diff) | |
| download | linux-d3fe5e6b3abfae9b08d80f9a635f1101491131f7.tar.xz linux-d3fe5e6b3abfae9b08d80f9a635f1101491131f7.zip | |
media: Documentation: Drop deprecated bytesused == 0
The V4L2 API historically allowed buffers to be queued with bytesused
set to 0 on output devices, in which case the driver would use the
buffer length. This behaviour is deprecated, and videobuf2 prints a
warning message in the kernel log. Drop it from the documentation.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/buffer.rst | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/Documentation/userspace-api/media/v4l/buffer.rst b/Documentation/userspace-api/media/v4l/buffer.rst index 4638ec64db00..04dec3e570ed 100644 --- a/Documentation/userspace-api/media/v4l/buffer.rst +++ b/Documentation/userspace-api/media/v4l/buffer.rst @@ -187,10 +187,8 @@ struct v4l2_buffer on the negotiated data format and may change with each buffer for compressed variable size data like JPEG images. Drivers must set this field when ``type`` refers to a capture stream, applications - when it refers to an output stream. If the application sets this - to 0 for an output stream, then ``bytesused`` will be set to the - size of the buffer (see the ``length`` field of this struct) by - the driver. For multiplanar formats this field is ignored and the + when it refers to an output stream. For multiplanar formats this field + is ignored and the ``planes`` pointer is used instead. * - __u32 - ``flags`` @@ -327,10 +325,7 @@ struct v4l2_plane - ``bytesused`` - The number of bytes occupied by data in the plane (its payload). Drivers must set this field when ``type`` refers to a capture - stream, applications when it refers to an output stream. If the - application sets this to 0 for an output stream, then - ``bytesused`` will be set to the size of the plane (see the - ``length`` field of this struct) by the driver. + stream, applications when it refers to an output stream. .. note:: |