linux-kernel - Re: [PATCH v5 1/3] media: videodev2: Add flag to unconditionnaly enumerate pixels formats

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Message-ID: <20240723090032.x24ezk5vgihaf6z3@basti-XPS-13-9310>
Date: Tue, 23 Jul 2024 11:00:32 +0200
From: Sebastian Fricke <sebastian.fricke@...labora.com>
To: Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc: mchehab@...nel.org, ezequiel@...guardiasur.com.ar,
	hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	kernel@...labora.com
Subject: Re: [PATCH v5 1/3] media: videodev2: Add flag to unconditionnaly
 enumerate pixels formats

Hey Benjamin,

in the subject line:

s/unconditionnaly enumerate pixels/unconditionally enumerate pixel/

On 22.07.2024 17:05, Benjamin Gaignard wrote:
>When the index field is ORed with V4L2_FMT_FLAG_ENUM_ALL the driver

s/is ORed with/is set with/ (same meaning but a lot less confusing)

>will ignore any configuration and enumerate all the possible formats.
>Drivers which do not support this flag yet always return an EINVAL

s/yet always/yet, always/

>error code.
>
>Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>---
>changes in version 5:
>- Reset the proposal to follow Hans's advices
>- Add new flag to be used with index field.
>
> .../userspace-api/media/v4l/vidioc-enum-fmt.rst      | 12 +++++++++++-
> .../userspace-api/media/videodev2.h.rst.exceptions   |  1 +
> include/uapi/linux/videodev2.h                       |  3 +++
> 3 files changed, 15 insertions(+), 1 deletion(-)
>
>diff --git a/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst b/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst
>index 3adb3d205531..12e1e65e6a71 100644
>--- a/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst
>+++ b/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst
>@@ -85,7 +85,11 @@ the ``mbus_code`` field is handled differently:
>     * - __u32
>       - ``index``
>       - Number of the format in the enumeration, set by the application.
>-	This is in no way related to the ``pixelformat`` field.
>+        This is in no way related to the ``pixelformat`` field. When the
>+        index is ORed with V4L2_FMT_FLAG_ENUM_ALL the driver will ignore

s/ORed/set/ (same as above)

>+        any configuration and enumerate all the possible formats. Drivers
>+        which do not support this flag yet always return an ``EINVAL``

s/yet always/yet, always/

>+        error code.
>     * - __u32
>       - ``type``
>       - Type of the data stream, set by the application. Only these types
>@@ -234,6 +238,12 @@ the ``mbus_code`` field is handled differently:
> 	valid. The buffer consists of ``height`` lines, each having ``width``
> 	Data Units of data and the offset (in bytes) between the beginning of
> 	each two consecutive lines is ``bytesperline``.
>+    * - ``V4L2_FMT_FLAG_ENUM_ALL``
>+      - 0x80000000
>+      - When the applications ORs ``index`` with ``V4L2_FMT_FLAG_ENUM_ALL`` flag

s/applications/application/
s/ORs/sets/

>+        the driver enumerates all the possible pixel formats without taking care
>+        of any already set configuration. Drivers which do not support this flag
>+        yet always return ``EINVAL``.

s/yet always/yet, always/

>
> Return Value
> ============
>diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
>index bdc628e8c1d6..8dc10a500fc6 100644
>--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
>+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
>@@ -216,6 +216,7 @@ replace define V4L2_FMT_FLAG_CSC_YCBCR_ENC fmtdesc-flags
> replace define V4L2_FMT_FLAG_CSC_HSV_ENC fmtdesc-flags
> replace define V4L2_FMT_FLAG_CSC_QUANTIZATION fmtdesc-flags
> replace define V4L2_FMT_FLAG_META_LINE_BASED fmtdesc-flags
>+replace define V4L2_FMT_FLAG_ENUM_ALL fmtdesc-flags
>
> # V4L2 timecode types
> replace define V4L2_TC_TYPE_24FPS timecode-type
>diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>index 4e91362da6da..3d11f91273a1 100644
>--- a/include/uapi/linux/videodev2.h
>+++ b/include/uapi/linux/videodev2.h
>@@ -904,6 +904,9 @@ struct v4l2_fmtdesc {
> #define V4L2_FMT_FLAG_CSC_QUANTIZATION		0x0100
> #define V4L2_FMT_FLAG_META_LINE_BASED		0x0200
>
>+/*  Format description flag, to be ORed with the index */

s/ORed/set/

Regards,
Sebastian

>+#define V4L2_FMT_FLAG_ENUM_ALL			0x80000000
>+
> 	/* Frame Size and frame rate enumeration */
> /*
>  *	F R A M E   S I Z E   E N U M E R A T I O N
>-- 
>2.43.0
>
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