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SubjectRe: [PATCH v3 3/3] media: vidioc-enum-fmt.rst: clarify format preference
On Wed, 13 Nov 2019 14:56:03 -0300
Ezequiel Garcia <ezequiel@collabora.com> wrote:

> It has been decided to use the ENUM_FMT index value
> as a hint for driver preference. This is defined purposedly
> in a very liberal way, letting drivers define what "preference"
> means.
>
> For instance, the Hantro VPU driver indicates additional
> processing to output a given format, and thus implicates
> more CPU usage, which is enumerated after native (non-processed)
> formats.
>
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>

> ---
> Documentation/media/uapi/v4l/vidioc-enum-fmt.rst | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
> index 399ef1062bac..8ca6ab701e4a 100644
> --- a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
> +++ b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
> @@ -44,7 +44,9 @@ To enumerate image formats applications initialize the ``type`` and
> the :ref:`VIDIOC_ENUM_FMT` ioctl with a pointer to this structure. Drivers
> fill the rest of the structure or return an ``EINVAL`` error code. All
> formats are enumerable by beginning at index zero and incrementing by
> -one until ``EINVAL`` is returned.
> +one until ``EINVAL`` is returned. If applicable, drivers shall return
> +formats in preference order, where preferred formats are returned before
> +(that is, with lower ``index`` value) less-preferred formats.
>
> .. note::
>

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