The reference_mode derived syntax is part of the compressed headers and
should have been moved into the corresponding control structure. Document
this mistake. The value can be set to 0 if the driver does not require
compressed headers information.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
---
 .../userspace-api/media/v4l/ext-ctrls-codec-stateless.rst  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
index cc080c4257d01..ec48e4acb5ece 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
@@ -1692,7 +1692,12 @@ See section '7.3.1 Tx mode semantics' of the :ref:`vp9` specification for more d
     * - __u8
       - ``reference_mode``
       - Specifies the type of inter prediction to be used. See
-        :ref:`Reference Mode<vp9_reference_mode>` for more details.
+        :ref:`Reference Mode<vp9_reference_mode>` for more details. Note that
+	this is derived as part of the compressed header parsing process and
+	for this reason should have bee part of
+	:c:type: `v4l2_ctrl_vp9_compressed_hdr` optional control. It is safe to
+	set this value to zero if the driver does not require compressed
+	headers.
     * - __u8
       - ``reserved[7]``
       - Applications and drivers must set this to zero.
-- 
2.35.1

Hi Nicolas,

Thanks,

BTW There's a typo in the text, please see below, but other than that

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

W dniu 21.02.2022 o 20:37, Nicolas Dufresne pisze:
> The reference_mode derived syntax is part of the compressed headers and
> should have been moved into the corresponding control structure. Document
> this mistake. The value can be set to 0 if the driver does not require
> compressed headers information.
> 
> Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
> ---
>   .../userspace-api/media/v4l/ext-ctrls-codec-stateless.rst  | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
> index cc080c4257d01..ec48e4acb5ece 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
> @@ -1692,7 +1692,12 @@ See section '7.3.1 Tx mode semantics' of the :ref:`vp9` specification for more d
>       * - __u8
>         - ``reference_mode``
>         - Specifies the type of inter prediction to be used. See
> -        :ref:`Reference Mode<vp9_reference_mode>` for more details.
> +        :ref:`Reference Mode<vp9_reference_mode>` for more details. Note that
> +	this is derived as part of the compressed header parsing process and
> +	for this reason should have bee part of

should have been

> +	:c:type: `v4l2_ctrl_vp9_compressed_hdr` optional control. It is safe to
> +	set this value to zero if the driver does not require compressed
> +	headers.
>       * - __u8
>         - ``reserved[7]``
>         - Applications and drivers must set this to zero.