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Message-ID: <906411e5-4354-4670-bd84-640a5b47a2bd@kernel.org>
Date: Thu, 28 Aug 2025 11:50:21 -0500
From: Mario Limonciello <superm1@...nel.org>
To: Bin Du <Bin.Du@....com>, mchehab@...nel.org, hverkuil@...all.nl,
laurent.pinchart+renesas@...asonboard.com, bryan.odonoghue@...aro.org,
sakari.ailus@...ux.intel.com, prabhakar.mahadev-lad.rj@...renesas.com,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
sultan@...neltoast.com
Cc: pratap.nirujogi@....com, benjamin.chan@....com, king.li@....com,
gjorgji.rosikopulos@....com, Phil.Jawich@....com, Dominic.Antony@....com,
richard.gong@....com, anson.tsao@....com,
Svetoslav Stoilov <Svetoslav.Stoilov@....com>
Subject: Re: [PATCH v3 7/7] Documentation: add documentation of AMD isp 4
driver
Just two small nits to me.
On 8/28/25 5:08 AM, Du, Bin wrote:
> Add documentation for AMD isp 4 and describe the main components
Probably should be "ISP"
>
> Co-developed-by: Svetoslav Stoilov <Svetoslav.Stoilov@....com>
> Signed-off-by: Svetoslav Stoilov <Svetoslav.Stoilov@....com>
> Signed-off-by: Bin Du <Bin.Du@....com>
Reviewed-by: Mario Limonciello (AMD) <superm1@...nel.org>
> ---
> Documentation/admin-guide/media/amdisp4-1.rst | 66 +++++++++++++++++++
> Documentation/admin-guide/media/amdisp4.dot | 8 +++
> .../admin-guide/media/v4l-drivers.rst | 1 +
> MAINTAINERS | 2 +
> 4 files changed, 77 insertions(+)
> create mode 100644 Documentation/admin-guide/media/amdisp4-1.rst
> create mode 100644 Documentation/admin-guide/media/amdisp4.dot
>
> diff --git a/Documentation/admin-guide/media/amdisp4-1.rst b/Documentation/admin-guide/media/amdisp4-1.rst
> new file mode 100644
> index 000000000000..a5ed78912d0f
> --- /dev/null
> +++ b/Documentation/admin-guide/media/amdisp4-1.rst
> @@ -0,0 +1,66 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +.. include:: <isonum.txt>
> +
> +====================================
> +AMD Image Signal Processor (amdisp4)
> +====================================
> +
> +Introduction
> +============
> +
> +This file documents the driver for the AMD ISP4 that is part of
> +AMD Ryzen AI Max 385 SoC.
It's in 390 too isn't it?
Maybe it's better to say:
Ryzen AI Max 300 Series
That's what
https://www.amd.com/en/products/processors/laptop/ryzen/ai-300-series/amd-ryzen-ai-max-plus-395.html
uses after all.
> +
> +The driver is located under drivers/media/platform/amd/isp4 and uses
> +the Media-Controller API.
> +
> +Topology
> +========
> +
> +.. _amdisp4_topology_graph:
> +
> +.. kernel-figure:: amdisp4.dot
> + :alt: Diagram of the media pipeline topology
> + :align: center
> +
> +
> +
> +The driver has 1 sub-device:
> +
> +- isp: used to resize and process bayer raw frames in to yuv.
> +
> +The driver has 1 video device:
> +
> +- capture video device: capture device for retrieving images.
> +
> +
> + - ISP4 Image Signal Processing Subdevice Node
> +
> +-----------------------------------------------
> +
> +The isp4 is represented as a single V4L2 subdev, the sub-device does not
> +provide interface to the user space. The sub-device is connected to one video node
> +(isp4_capture) with immutable active link. The isp entity is connected
> +to sensor pad 0 and receives the frames using CSI-2 protocol. The sub-device is
> +also responsible to configure CSI2-2 receiver.
> +The sub-device processes bayer raw data from the connected sensor and output
> +them to different YUV formats. The isp also has scaling capabilities.
> +
> + - isp4_capture - Frames Capture Video Node
> +
> +--------------------------------------------
> +
> +Isp4_capture is a capture device to capture frames to memory.
> +This entity is the DMA engine that write the frames to memory.
> +The entity is connected to isp4 sub-device.
> +
> +Capturing Video Frames Example
> +==============================
> +
> +.. code-block:: bash
> +
> + # set the links
> +
> + # start streaming:
> + v4l2-ctl "-d" "/dev/video0" "--set-fmt-video=width=1920,height=1080,pixelformat=NV12" "--stream-mmap" "--stream-count=10"
> diff --git a/Documentation/admin-guide/media/amdisp4.dot b/Documentation/admin-guide/media/amdisp4.dot
> new file mode 100644
> index 000000000000..a4c2f0cceb30
> --- /dev/null
> +++ b/Documentation/admin-guide/media/amdisp4.dot
> @@ -0,0 +1,8 @@
> +digraph board {
> + rankdir=TB
> + n00000001 [label="{{<port0> 0} | amd isp4\n | {<port1> 1}}", shape=Mrecord, style=filled, fillcolor=green]
> + n00000001:port1 -> n00000004 [style=bold]
> + n00000004 [label="Preview\n/dev/video0", shape=box, style=filled, fillcolor=yellow]
> + n0000000a [label="{{} | ov05c10 22-0010\n/dev/v4l-subdev0 | {<port0> 0}}", shape=Mrecord, style=filled, fillcolor=green]
> + n0000000a:port0 -> n00000001:port0 [style=bold]
> +}
> diff --git a/Documentation/admin-guide/media/v4l-drivers.rst b/Documentation/admin-guide/media/v4l-drivers.rst
> index 3bac5165b134..6027416e5373 100644
> --- a/Documentation/admin-guide/media/v4l-drivers.rst
> +++ b/Documentation/admin-guide/media/v4l-drivers.rst
> @@ -9,6 +9,7 @@ Video4Linux (V4L) driver-specific documentation
> .. toctree::
> :maxdepth: 2
>
> + amdisp4-1
> bttv
> c3-isp
> cafe_ccic
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7724620896e7..72ef7c77d881 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1139,6 +1139,8 @@ M: Nirujogi Pratap <pratap.nirujogi@....com>
> L: linux-media@...r.kernel.org
> S: Maintained
> T: git git://linuxtv.org/media.git
> +F: Documentation/admin-guide/media/amdisp4-1.rst
> +F: Documentation/admin-guide/media/amdisp4.dot
> F: drivers/media/platform/amd/Kconfig
> F: drivers/media/platform/amd/Makefile
> F: drivers/media/platform/amd/isp4/Kconfig
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