Re: [RFC v4 4/9] media: Documentation: Add subdev configuration models, raw sensor model

Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx> · Wed, 8 Jan 2025 14:01:42 +0200

Hi,

On 20/12/2024 15:24, Sakari Ailus wrote:
Sub-device configuration models define what V4L2 API elements are
available on a compliant sub-device and how do they behave.

The patch also adds a model for common raw sensors.

Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
  .../media/drivers/camera-sensor.rst           |   4 +
  .../media/v4l/common-raw-sensor.dia           | 441 ++++++++++++++++++
  .../media/v4l/common-raw-sensor.svg           | 134 ++++++
  .../userspace-api/media/v4l/dev-subdev.rst    |   2 +
  .../media/v4l/subdev-config-model.rst         | 209 +++++++++
  5 files changed, 790 insertions(+)
  create mode 100644 Documentation/userspace-api/media/v4l/common-raw-sensor.dia
  create mode 100644 Documentation/userspace-api/media/v4l/common-raw-sensor.svg
  create mode 100644 Documentation/userspace-api/media/v4l/subdev-config-model.rst

diff --git a/Documentation/userspace-api/media/drivers/camera-sensor.rst b/Documentation/userspace-api/media/drivers/camera-sensor.rst
index bc55c861fb69..5bc4c79d230c 100644
--- a/Documentation/userspace-api/media/drivers/camera-sensor.rst
+++ b/Documentation/userspace-api/media/drivers/camera-sensor.rst
@@ -18,6 +18,8 @@ binning functionality. The sensor drivers belong to two distinct classes, freely
  configurable and register list-based drivers, depending on how the driver
  configures this functionality.
  
+Also see :ref:`media_subdev_config_model_common_raw_sensor`.
+
  Freely configurable camera sensor drivers
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
@@ -105,6 +107,8 @@ values programmed by the register sequences. The default values of these
  controls shall be 0 (disabled). Especially these controls shall not be inverted,
  independently of the sensor's mounting rotation.
  
+.. _media_using_camera_sensor_drivers_embedded_data:
+
  Embedded data
  -------------
  
diff --git a/Documentation/userspace-api/media/v4l/common-raw-sensor.dia b/Documentation/userspace-api/media/v4l/common-raw-sensor.dia
new file mode 100644
index 000000000000..aa927527eae3
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diff --git a/Documentation/userspace-api/media/v4l/common-raw-sensor.svg b/Documentation/userspace-api/media/v4l/common-raw-sensor.svg
new file mode 100644
index 000000000000..1d6055da2519
--- /dev/null
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+</svg>

That's a lot of text for a simple picture =).

diff --git a/Documentation/userspace-api/media/v4l/dev-subdev.rst b/Documentation/userspace-api/media/v4l/dev-subdev.rst
index dcfcbd52490d..4d145bd3bd09 100644
--- a/Documentation/userspace-api/media/v4l/dev-subdev.rst
+++ b/Documentation/userspace-api/media/v4l/dev-subdev.rst
@@ -838,3 +838,5 @@ stream while it may be possible to enable and disable the embedded data stream.
  
  The embedded data format does not need to be configured on the sensor's pads as
  the format is dictated by the pixel data format in this case.
+
+.. include:: subdev-config-model.rst
diff --git a/Documentation/userspace-api/media/v4l/subdev-config-model.rst b/Documentation/userspace-api/media/v4l/subdev-config-model.rst
new file mode 100644
index 000000000000..b0bd09772ceb
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/subdev-config-model.rst
@@ -0,0 +1,209 @@
+.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
+
+.. _media_subdev_config_model:
+
+Sub-device configuration models
+===============================
+
+A sub-device configuration model specifies in detail what the user space can
+expect from a sub-device in terms of V4L2 sub-device interface support,
+semantics included.
+
+A sub-device may implement more than one configuration model at the same
+time. The implemented configuration models can be obtained from the sub-device's
+``V4L2_CID_CONFIG_MODEL`` control.
+
+.. _media_subdev_config_model_common_raw_sensor:
+
+Common raw camera sensor model
+------------------------------
+
+The common raw camera sensor model defines a set of enumeration and
+configuration interfaces (formats, selections etc.) that cover the vast majority
+of functionality of raw camera sensors. Not all of the interfaces are
+necessarily offered by all drivers.
+
+A sub-device complies with the common raw sensor model if the
+``V4L2_CONFIG_MODEL_COMMON_RAW`` bit is set in the ``V4L2_CID_CONFIG_MODEL``
+control of the sub-device.
+
+The common raw camera sensor model is aligned with
+:ref:`media_using_camera_sensor_drivers`. Please refer to that regarding aspects
+not specified here.
+
+Each camera sensor implementing the common raw sensor model exposes a single
+V4L2 sub-device. The sub-device contains a single source pad (0) and two or more
+internal pads: an image data internal pad (1) and optionally an embedded data
+pad (2). Additionally, further internal pads may be supported for other
+features, in which case they are documented separately for the given device.
+
+This is shown in :ref:`media_subdev_config_model_common_raw_sensor_subdev`.
+
+.. _media_subdev_config_model_common_raw_sensor_subdev:
+
+.. kernel-figure:: common-raw-sensor.svg
+    :alt:    common-raw-sensor.svg
+    :align:  center
+
+    **Common raw sensor sub-device**
+
+Routes
+^^^^^^
+
+A sub-device conforming to common raw camera sensor model implements the
+following routes.
+
+.. flat-table:: Routes
+    :header-rows: 1
+
+    * - Sink pad/stream
+      - Source pad/stream
+      - Static (X/M(aybe)/-)
+      - Mandatory (X/-)
+      - Synopsis
+    * - 1/0
+      - 0/0
+      - X
+      - X
+      - Image data
+    * - 2/0
+      - 0/1
+      - M
+      - \-
+      - Embedded data

Maybe just have the X/M/- written out in the table (yes/maybe/no)? The 
letter coding feels like it just makes it harder to read.

+
+Support for the embedded data stream is optional. Drivers supporting the
+embedded data stream may allow disabling and enabling the route when the
+streaming is disabled.
+
+Sensor pixel array size, cropping and binning
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The sensor's pixel array is divided into one or more areas. The areas around the
+edge of the pixel array, usually one or more sides, may contain optical black
+pixels, dummy pixels and other non-image pixels. The entire pixel array size is
+conveyed by the format on (pad, stream) pair 1/0.

I think we often need to refer to a stream (or to a pad if streams are 
not supported by the device). Maybe we can define a concise format, 
explained in one place, and then use it everywhere?

When referring to a pad, we should just say "pad". When referring to a 
stream, I don't think it helps to talk about pad-stream pairs, just say 
"stream".

E.g. If the subdev is implicit: "pad 1" or stream "1/0". Or if we're 
dealing with multiple subdevs, something like "pad ov1234:1" or "stream 
ov1234:1/0"? Or, if the subdev and pad are clear in the context, we can 
just say "stream 1".

+
+A rectangle within the pixel array contains the visible pixels. Capturing the
+non-visible pixels outside the visible pixel area may be supported by the
+sensor. The visible pixel area corresponds to the ``V4L2_SEL_TGT_CROP_DEFAULT``
+selection target on (pad, stream) pair 1/0.
+
+Sensors can perform multiple operations that affect the output image size. First
+of these is the analogue crop. Analogue crop limits the area of the pixel array
+which the sensor will read, affecting sensor timing as well. The granularity of
+the analogue crop configuration varies greatly across sensors: some sensors
+support only a few different analogue crop configurations whereas others may
+support anything divisible by a given number of pixels. The analogue crop
+configuration corresponds the ``V4L2_SEL_TGT_CROP`` selection target on (pad,
+stream) pair 1/0. The default analogue crop rectangle corresponds to the visible
+pixel area.
+
+In the next step, binning is performed on the image data read from camera
+sensor's pixel array, as determined by the analogue crop configuration. Enabling
+binning will effectively result in an image smaller than the original by given
+binning factors horizontally and vertically. Typical values are 1/2 and 1/3 but
+others may well be supported by the hardware as well.
+
+Sub-sampling follows binning. Sub-sampling, like binning, reduces the size of
+the image by including only a subset of samples read from the sensor's pixel
+matrix, typically every n'th pixel horizontally and vertically, taking the
+sensor's colour pattern into account. Sub-sampling is generally configurable
+separately horizontally and vertically.
+
+Binning and sub-sampling are configured using the ``V4L2_SEL_TGT_COMPOSE``
+rectangle, relative to the analogue crop rectangle, on (pad, stream) pair
+1/0. The driver implementation determines how to configure binning and
+sub-sampling to achieve the desired size.
+
+The digital crop operation takes place after binning and sub-sampling. It is
+configured by setting the ``V4L2_SEL_TGT_CROP`` rectangle on (pad, stream) pair
+0/0. The resulting image size is further output by the sensor.
+
+The sensor's output mbus code is configured by setting the format on the (pad,
+stream) pair 0/0. When setting the format, always use the same width and height
+as for the digital crop setting.
+
+Drivers may only support some of even none of these configurations, in which
+case they do not expose the corresponding selection rectangles. If any selection
+targets are omitted, the further selection rectangle or format is instead
+related to the previous implemented selection rectangle. For instance, if the
+sensor supports binning but not analogue crop, then the binning configuration
+(``V4L2_SEL_TGT_COMPOSE`` selection target) is done in relation to the visible
+pixel area (``V4L2_SEL_TGT_CROP_DEFAULT`` selection target).
+
+Also refer to :ref:`Selection targets <v4l2-selection-targets-table>`.
+
+.. flat-table:: Selection targets on pads
+    :header-rows: 1
+
+    * - Pad/Stream
+      - Selection target/format
+      - Mandatory (X/-)
+      - Modifiable (X/-)
+      - Synopsis
+    * - 1/0
+      - Format
+      - X
+      - \-
+      - Image data format. The width and the height fields indicates the full
+        size of the pixel array, including non-visible pixels. The media bus
+        code of this format reflects the native pixel depth of the sensor.
+    * - 1/0
+      - ``V4L2_SEL_TGT_CROP_DEFAULT``
+      - X
+      - \
+      - The visible pixel area. This rectangle is relative to the format on the
+        same (pad, stream).
+    * - 1/0
+      - ``V4L2_SEL_TGT_CROP``
+      - \-
+      - X
+      - Analogue crop. Analogue crop typically has a coarse granularity. This
+        rectangle is relative to the format on the same (pad, stream).
+    * - 1/0
+      - ``V4L2_SEL_TGT_COMPOSE``
+      - \-
+      - X
+      - Binning and sub-sampling. This rectangle is relative to the
+        ``V4L2_SEL_TGT_CROP`` rectangle on the same (pad, stream). The
+        combination of binning and sub-sampling is configured using this
+        selection target.
+    * - 2/0
+      - Format
+      - X
+      - \-
+      - Embedded data format.
+    * - 0/0
+      - ``V4L2_SEL_TGT_CROP``
+      - \-
+      - X
+      - Digital crop. This rectangle is relative to the ``V4L2_SEL_TGT_COMPOSE``
+        rectangle on (pad, stream) pair 1/0.
+    * - 0/0
+      - Format
+      - X
+      - X
+      - Image data source format. Always assign the width and height fields of
+        the format to the same values than for the ``V4L2_SEL_TGT_CROP``
+        rectangle on (pad, stream) pair 0/0. The media bus code reflects the
+        pixel data output of the sensor.
+    * - 0/1
+      - Format
+      - X
+      - \-
+      - Embedded data source format.
+
+Embedded data
+^^^^^^^^^^^^^
+
+The embedded data stream is produced by the sensor when the corresponding route
+is enabled. The embedded data route may also be immutable or not exist at all,
+in case the sensor (or the driver) does not support it.
+
+Generally the sensor embedded data width is determined by the width of the image
+data whereas the number of lines are constant for the embedded data. The user
+space may obtain the size of the embedded data once the image data size on the
+source pad has been configured.
+
+Also see :ref:`media_using_camera_sensor_drivers_embedded_data`.

I'm not that familiar with raw sensor pipelines and cropping, but looks 
good to me.

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>

 Tomi








