Documentation/admin-guide/media/amdisp4-1.rst
.. SPDX-License-Identifier: GPL-2.0
.. include:: <isonum.txt>
This file documents the driver for the AMD ISP4 that is part of AMD Ryzen AI Max 300 Series.
The driver is located under drivers/media/platform/amd/isp4 and uses the Media-Controller API.
The driver exposes one video capture device to userspace and provide web camera like interface. Internally the video device is connected to the isp4 sub-device responsible for communication with the CCPU FW.
.. _amdisp4_topology_graph:
.. kernel-figure:: amdisp4.dot :alt: Diagram of the media pipeline topology :align: center
The driver has 1 sub-device: Representing isp4 image signal processor. The driver has 1 video device: Capture device for retrieving images.
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 sub-device represents ISP with connected sensor similar to smart cameras (sensors with integrated ISP). sub-device has only one link to the video device for capturing the frames. The sub-device communicates with CCPU FW for streaming configuration and buffer management.
Isp4_capture is a capture device to capture frames to memory. The entity is connected to isp4 sub-device. The video device provides web camera like interface to userspace. It supports mmap and dma buf types of memory.
.. code-block:: bash
v4l2-ctl "-d" "/dev/video0" "--set-fmt-video=width=1920,height=1080,pixelformat=NV12" "--stream-mmap" "--stream-count=10"