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0171157d45
The patches were generated from the RPi repo with the following command: git format-patch v6.6.44..rpi-6.6.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
87 lines
3.4 KiB
Diff
87 lines
3.4 KiB
Diff
From 7ca73020a5b26599d539083e413784e79891107e Mon Sep 17 00:00:00 2001
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From: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
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Date: Fri, 26 Jan 2024 15:04:59 +0100
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Subject: [PATCH 1150/1215] media: uapi: Document meta pixel format for PiSP BE
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config
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Add format description for the PiSP Back End configuration parameter
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buffer.
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Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
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Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
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---
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.../userspace-api/media/v4l/meta-formats.rst | 1 +
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.../media/v4l/metafmt-pisp-be.rst | 56 +++++++++++++++++++
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2 files changed, 57 insertions(+)
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create mode 100644 Documentation/userspace-api/media/v4l/metafmt-pisp-be.rst
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--- a/Documentation/userspace-api/media/v4l/meta-formats.rst
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+++ b/Documentation/userspace-api/media/v4l/meta-formats.rst
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@@ -15,6 +15,7 @@ These formats are used for the :ref:`met
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metafmt-bcm2835-isp-stats
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metafmt-d4xx
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metafmt-intel-ipu3
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+ metafmt-pisp-be
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metafmt-rkisp1
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metafmt-sensor-data
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metafmt-uvc
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--- /dev/null
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+++ b/Documentation/userspace-api/media/v4l/metafmt-pisp-be.rst
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@@ -0,0 +1,56 @@
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+.. SPDX-License-Identifier: GPL-2.0
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+
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+.. _v4l2-meta-fmt-rpi-be-cfg:
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+
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+************************
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+V4L2_META_FMT_RPI_BE_CFG
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+************************
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+
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+Raspberry Pi PiSP Back End configuration format
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+===============================================
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+
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+The Raspberry Pi PiSP Back End memory-to-memory image signal processor is
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+configured by userspace by providing a buffer of configuration parameters
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+to the `pispbe-config` output video device node using the
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+:c:type:`v4l2_meta_format` interface.
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+
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+The PiSP Back End processes images in tiles, and its configuration requires
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+specifying two different sets of parameters by populating the members of
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+:c:type:`pisp_be_tiles_config` defined in the ``pisp_be_config.h`` header file.
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+
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+The `Raspberry Pi PiSP technical specification
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+<https://datasheets.raspberrypi.com/camera/raspberry-pi-image-signal-processor-specification.pdf>`_
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+provide detailed description of the ISP back end configuration and programming
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+model.
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+
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+Global configuration data
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+-------------------------
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+
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+The global configuration data describe how the pixels in a particular image are
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+to be processed and is therefore shared across all the tiles of the image. So
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+for example, LSC (Lens Shading Correction) or Denoise parameters would be common
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+across all tiles from the same frame.
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+
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+Global configuration data are passed to the ISP by populating the member of
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+:c:type:`pisp_be_config`.
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+
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+Tile parameters
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+---------------
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+
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+As the ISP processes images in tiles, each set of tiles parameters describe how
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+a single tile in an image is going to be processed. A single set of tile
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+parameters consist of 160 bytes of data and to process a batch of tiles several
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+sets of tiles parameters are required.
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+
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+Tiles parameters are passed to the ISP by populating the member of
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+``pisp_tile`` and the ``num_tiles`` fields of :c:type:`pisp_be_tiles_config`.
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+
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+Raspberry Pi PiSP Back End uAPI data types
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+==========================================
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+
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+This section describes the data types exposed to userspace by the Raspberry Pi
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+PiSP Back End. The section is informative only, for a detailed description of
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+each field refer to the `Raspberry Pi PiSP technical specification
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+<https://datasheets.raspberrypi.com/camera/raspberry-pi-image-signal-processor-specification.pdf>`_.
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+
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+.. kernel-doc:: include/uapi/linux/media/raspberrypi/pisp_be_config.h
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