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media: uapi: Add generic serial metadata mbus formats 

Add generic serial metadata mbus formats. These formats describe data
width and packing but not the content itself. The reason for specifying
such formats is that the formats as such are fairly device specific but
they are still handled by CSI-2 receiver drivers that should not be aware
of device specific formats. What makes generic metadata formats possible
is that these formats are parsed by software only, after capturing the
data to system memory.

Also add a definition for "Data Unit" to cover what is essentially a pixel
but is not image data.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Sakari Ailus 2023-04-25 16:50:25 +03:00 committed by Hans Verkuil
parent 7ba432f01c
commit f28bdda2f8
3 changed files with 270 additions and 0 deletions
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7
Documentation/userspace-api/media/glossary.rst
View File

@ -25,6 +25,13 @@ Glossary
See :ref:`cec`.
Data Unit
Unit of data transported by a bus. On parallel buses, the data unit
consists of one or more related samples while on serial buses the data
unit is logical. If the data unit is image data, it may also be called a
pixel.
Device Driver
Part of the Linux Kernel that implements support for a hardware
component.

254
Documentation/userspace-api/media/v4l/subdev-formats.rst
View File

@ -8306,3 +8306,257 @@ The following table lists the existing metadata formats.
both sides of the link and the bus format is a fixed
metadata format that is not configurable from userspace.
Width and height will be set to 0 for this format.
Generic Serial Metadata Formats
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Generic serial metadata formats are used on serial buses where the actual data
content is more or less device specific but the data is transmitted and received
by multiple devices that do not process the data in any way, simply writing
it to system memory for processing in software at the end of the pipeline.
"b" in an array cell signifies a byte of data, followed by the number of the bit
and finally the bit number in subscript. "x" indicates a padding bit.
.. _media-bus-format-generic-meta:
.. cssclass: longtable
.. flat-table:: Generic Serial Metadata Formats
:header-rows: 2
:stub-columns: 0
* - Identifier
- Code
-
- :cspan:`23` Data organization within bus :term:`Data Unit`
* -
-
- Bit
- 23
- 22
- 21
- 20
- 19
- 18
- 17
- 16
- 15
- 14
- 13
- 12
- 11
- 10
- 9
- 8
- 7
- 6
- 5
- 4
- 3
- 2
- 1
- 0
* .. _MEDIA-BUS-FMT-META-8:
- MEDIA_BUS_FMT_META_8
- 0x8001
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- b0\ :sub:`7`
- b0\ :sub:`6`
- b0\ :sub:`5`
- b0\ :sub:`4`
- b0\ :sub:`3`
- b0\ :sub:`2`
- b0\ :sub:`1`
- b0\ :sub:`0`
* .. _MEDIA-BUS-FMT-META-10:
- MEDIA_BUS_FMT_META_10
- 0x8002
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- b0\ :sub:`7`
- b0\ :sub:`6`
- b0\ :sub:`5`
- b0\ :sub:`4`
- b0\ :sub:`3`
- b0\ :sub:`2`
- b0\ :sub:`1`
- b0\ :sub:`0`
- x
- x
* .. _MEDIA-BUS-FMT-META-12:
- MEDIA_BUS_FMT_META_12
- 0x8003
-
-
-
-
-
-
-
-
-
-
-
-
-
- b0\ :sub:`7`
- b0\ :sub:`6`
- b0\ :sub:`5`
- b0\ :sub:`4`
- b0\ :sub:`3`
- b0\ :sub:`2`
- b0\ :sub:`1`
- b0\ :sub:`0`
- x
- x
- x
- x
* .. _MEDIA-BUS-FMT-META-14:
- MEDIA_BUS_FMT_META_14
- 0x8004
-
-
-
-
-
-
-
-
-
-
-
- b0\ :sub:`7`
- b0\ :sub:`6`
- b0\ :sub:`5`
- b0\ :sub:`4`
- b0\ :sub:`3`
- b0\ :sub:`2`
- b0\ :sub:`1`
- b0\ :sub:`0`
- x
- x
- x
- x
- x
- x
* .. _MEDIA-BUS-FMT-META-16:
- MEDIA_BUS_FMT_META_16
- 0x8005
-
-
-
-
-
-
-
-
-
- b0\ :sub:`7`
- b0\ :sub:`6`
- b0\ :sub:`5`
- b0\ :sub:`4`
- b0\ :sub:`3`
- b0\ :sub:`2`
- b0\ :sub:`1`
- b0\ :sub:`0`
- x
- x
- x
- x
- x
- x
- x
- x
* .. _MEDIA-BUS-FMT-META-20:
- MEDIA_BUS_FMT_META_20
- 0x8006
-
-
-
-
-
- b0\ :sub:`7`
- b0\ :sub:`6`
- b0\ :sub:`5`
- b0\ :sub:`4`
- b0\ :sub:`3`
- b0\ :sub:`2`
- b0\ :sub:`1`
- b0\ :sub:`0`
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
* .. _MEDIA-BUS-FMT-META-24:
- MEDIA_BUS_FMT_META_24
- 0x8007
-
- b0\ :sub:`7`
- b0\ :sub:`6`
- b0\ :sub:`5`
- b0\ :sub:`4`
- b0\ :sub:`3`
- b0\ :sub:`2`
- b0\ :sub:`1`
- b0\ :sub:`0`
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x
- x

9
include/uapi/linux/media-bus-format.h
View File

@ -174,4 +174,13 @@
*/
#define MEDIA_BUS_FMT_METADATA_FIXED 0x7001
/* Generic line based metadata formats for serial buses. Next is 0x8008. */
#define MEDIA_BUS_FMT_META_8 0x8001
#define MEDIA_BUS_FMT_META_10 0x8002
#define MEDIA_BUS_FMT_META_12 0x8003
#define MEDIA_BUS_FMT_META_14 0x8004
#define MEDIA_BUS_FMT_META_16 0x8005
#define MEDIA_BUS_FMT_META_20 0x8006
#define MEDIA_BUS_FMT_META_24 0x8007
#endif /* __LINUX_MEDIA_BUS_FORMAT_H */