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Merge tag 'media/v6.13-1' of git://git.kernel.org/pub/scm/linux/kerne…
…l/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - removal of the old omap4iss media driver - mantis: remove orphan mantis_core.h - add support for Raspberypi CFE - uvc driver got a co-maintainer - main media tree moved to git://linuxtv.org/media.git - lots of driver cleanups, updates and fixes * tag 'media/v6.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (233 commits) docs: media: update location of the media patches MAINTAINERS: update location of media main tree media: MAINTAINERS: Add Hans de Goede as USB VIDEO CLASS co-maintainer media: platform: samsung: s5p-jpeg: Remove deadcode media: qcom: camss: Add MSM8953 resources media: dt-bindings: Add qcom,msm8953-camss media: qcom: camss: implement pm domain ops for VFE v4.1 media: platform: exynos4-is: Fix an OF node reference leak in fimc_md_is_isp_available media: adv7180: Also check for "adi,force-bt656-4" media: dt-bindings: adv7180: Document 'adi,force-bt656-4' media: mgb4: Fix inconsistent input/output alignment in loopback mode media: replace obsolete [email protected] alias Documentation: media: improve V4L2_CID_MIN_BUFFERS_FOR_*, doc media: vicodec: add V4L2_CID_MIN_BUFFERS_FOR_* controls media: atomisp: Add check for rgby_data memory allocation failure media: atomisp: remove redundant re-checking of err media: atomisp: Fix spelling errors reported by codespell media: atomisp: Remove License information boilerplate media: atomisp: Fix typos in comment media: atomisp: hmm_bo: Fix spelling errors in hmm_bo.h ...
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digraph board { | ||
rankdir=TB | ||
n00000001 [label="{{<port0> 0} | csi2\n/dev/v4l-subdev0 | {<port1> 1 | <port2> 2 | <port3> 3 | <port4> 4}}", shape=Mrecord, style=filled, fillcolor=green] | ||
n00000001:port1 -> n00000011 [style=dashed] | ||
n00000001:port1 -> n00000007:port0 | ||
n00000001:port2 -> n00000015 | ||
n00000001:port2 -> n00000007:port0 [style=dashed] | ||
n00000001:port3 -> n00000019 [style=dashed] | ||
n00000001:port3 -> n00000007:port0 [style=dashed] | ||
n00000001:port4 -> n0000001d [style=dashed] | ||
n00000001:port4 -> n00000007:port0 [style=dashed] | ||
n00000007 [label="{{<port0> 0 | <port1> 1} | pisp-fe\n/dev/v4l-subdev1 | {<port2> 2 | <port3> 3 | <port4> 4}}", shape=Mrecord, style=filled, fillcolor=green] | ||
n00000007:port2 -> n00000021 | ||
n00000007:port3 -> n00000025 [style=dashed] | ||
n00000007:port4 -> n00000029 | ||
n0000000d [label="{imx219 6-0010\n/dev/v4l-subdev2 | {<port0> 0}}", shape=Mrecord, style=filled, fillcolor=green] | ||
n0000000d:port0 -> n00000001:port0 [style=bold] | ||
n00000011 [label="rp1-cfe-csi2-ch0\n/dev/video0", shape=box, style=filled, fillcolor=yellow] | ||
n00000015 [label="rp1-cfe-csi2-ch1\n/dev/video1", shape=box, style=filled, fillcolor=yellow] | ||
n00000019 [label="rp1-cfe-csi2-ch2\n/dev/video2", shape=box, style=filled, fillcolor=yellow] | ||
n0000001d [label="rp1-cfe-csi2-ch3\n/dev/video3", shape=box, style=filled, fillcolor=yellow] | ||
n00000021 [label="rp1-cfe-fe-image0\n/dev/video4", shape=box, style=filled, fillcolor=yellow] | ||
n00000025 [label="rp1-cfe-fe-image1\n/dev/video5", shape=box, style=filled, fillcolor=yellow] | ||
n00000029 [label="rp1-cfe-fe-stats\n/dev/video6", shape=box, style=filled, fillcolor=yellow] | ||
n0000002d [label="rp1-cfe-fe-config\n/dev/video7", shape=box, style=filled, fillcolor=yellow] | ||
n0000002d -> n00000007:port1 | ||
} |
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.. SPDX-License-Identifier: GPL-2.0 | ||
============================================ | ||
Raspberry Pi PiSP Camera Front End (rp1-cfe) | ||
============================================ | ||
|
||
The PiSP Camera Front End | ||
========================= | ||
|
||
The PiSP Camera Front End (CFE) is a module which combines a CSI-2 receiver with | ||
a simple ISP, called the Front End (FE). | ||
|
||
The CFE has four DMA engines and can write frames from four separate streams | ||
received from the CSI-2 to the memory. One of those streams can also be routed | ||
directly to the FE, which can do minimal image processing, write two versions | ||
(e.g. non-scaled and downscaled versions) of the received frames to memory and | ||
provide statistics of the received frames. | ||
|
||
The FE registers are documented in the `Raspberry Pi Image Signal Processor | ||
(ISP) Specification document | ||
<https://datasheets.raspberrypi.com/camera/raspberry-pi-image-signal-processor-specification.pdf>`_, | ||
and example code for FE can be found in `libpisp | ||
<https://github.com/raspberrypi/libpisp>`_. | ||
|
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The rp1-cfe driver | ||
================== | ||
|
||
The Raspberry Pi PiSP Camera Front End (rp1-cfe) driver is located under | ||
drivers/media/platform/raspberrypi/rp1-cfe. It uses the `V4L2 API` to register | ||
a number of video capture and output devices, the `V4L2 subdev API` to register | ||
subdevices for the CSI-2 received and the FE that connects the video devices in | ||
a single media graph realized using the `Media Controller (MC) API`. | ||
|
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The media topology registered by the `rp1-cfe` driver, in this particular | ||
example connected to an imx219 sensor, is the following one: | ||
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.. _rp1-cfe-topology: | ||
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.. kernel-figure:: raspberrypi-rp1-cfe.dot | ||
:alt: Diagram of an example media pipeline topology | ||
:align: center | ||
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The media graph contains the following video device nodes: | ||
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- rp1-cfe-csi2-ch0: capture device for the first CSI-2 stream | ||
- rp1-cfe-csi2-ch1: capture device for the second CSI-2 stream | ||
- rp1-cfe-csi2-ch2: capture device for the third CSI-2 stream | ||
- rp1-cfe-csi2-ch3: capture device for the fourth CSI-2 stream | ||
- rp1-cfe-fe-image0: capture device for the first FE output | ||
- rp1-cfe-fe-image1: capture device for the second FE output | ||
- rp1-cfe-fe-stats: capture device for the FE statistics | ||
- rp1-cfe-fe-config: output device for FE configuration | ||
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rp1-cfe-csi2-chX | ||
---------------- | ||
|
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The rp1-cfe-csi2-chX capture devices are normal V4L2 capture devices which | ||
can be used to capture video frames or metadata received from the CSI-2. | ||
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rp1-cfe-fe-image0, rp1-cfe-fe-image1 | ||
------------------------------------ | ||
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The rp1-cfe-fe-image0 and rp1-cfe-fe-image1 capture devices are used to write | ||
the processed frames to memory. | ||
|
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rp1-cfe-fe-stats | ||
---------------- | ||
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The format of the FE statistics buffer is defined by | ||
:c:type:`pisp_statistics` C structure and the meaning of each parameter is | ||
described in the `PiSP specification` document. | ||
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rp1-cfe-fe-config | ||
----------------- | ||
|
||
The format of the FE configuration buffer is defined by | ||
:c:type:`pisp_fe_config` C structure and the meaning of each parameter is | ||
described in the `PiSP specification` document. |
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