Hi Bingbu,
Thank you for the patch.
On Thu, Apr 13, 2023 at 06:04:28PM +0800, bingbu.cao@xxxxxxxxx wrote:
> From: Bingbu Cao <bingbu.cao@xxxxxxxxx>
>
> This document mainly describe the functionality of IPU6 and
> IPU6 isys driver, and gives an example that how user can do
> imaging capture with tools.
>
> Signed-off-by: Bingbu Cao <bingbu.cao@xxxxxxxxx>
> ---
> Documentation/admin-guide/media/ipu6-isys.rst | 128 +++++++
> .../admin-guide/media/ipu6_isys_graph.svg | 338 ++++++++++++++++++
> .../admin-guide/media/v4l-drivers.rst | 1 +
> 3 files changed, 467 insertions(+)
> create mode 100644 Documentation/admin-guide/media/ipu6-isys.rst
> create mode 100644 Documentation/admin-guide/media/ipu6_isys_graph.svg
>
> diff --git a/Documentation/admin-guide/media/ipu6-isys.rst b/Documentation/admin-guide/media/ipu6-isys.rst
> new file mode 100644
> index 000000000000..083b00449b86
> --- /dev/null
> +++ b/Documentation/admin-guide/media/ipu6-isys.rst
> @@ -0,0 +1,128 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +.. include:: <isonum.txt>
> +
> +===============================================================
> +Intel Image Processing Unit 6 (IPU6) Input System driver
> +===============================================================
> +
> +Copyright |copy| 2023 Intel Corporation
> +
> +Introduction
> +============
> +
> +This file documents the Intel IPU6 (6th generation Image Processing Unit)
> +Input System (MIPI CSI2 receiver) drivers located under
> +drivers/media/pci/intel/ipu6.
> +
> +
> +The Intel IPU6 can be found in certain Intel Chipsets but not in all SKUs:
> +
> +* TigerLake
> +* JasperLake
> +* AlderLake
> +* RaptorLake
> +* MeteorLake
> +
> +Intel IPU6 is made up of two components - Input System (ISYS) and Processing
> +System (PSYS).
> +
> +The Input System mainly work as MIPI CSI2 receiver which receive and process the
s/work/works/
s/receive/receives/
s/process/processes/
> +imaging data from the sensors and outputs the frames to memory.
> +
> +There are 2 driver modules - intel_ipu6 and intel_ipu6_isys. intel_ipu6 is IPU6
s/is IPU6/is an IPU6/
> +common driver which does PCI configuration, firmware loading and parsing,
> +firmware authentication, DMA mapping and IPU-MMU (internal Memory mapping Unit)
> +configuration. intel_ipu6_isys implements V4L2, Media Controller and V4L2
> +sub-device interfaces. The IPU6 ISYS driver supports camera sensors connected
> +to the IPU6 ISYS through V4L2 sub-device sensor drivers.
Will the intel_ipu6 driver also serve a future intel_ipu6_psys driver,
or is it specific to the ISYS ?
> +
> +Input system driver
> +===================
> +
> +Input System driver mainly configure CSI2 DPHY, construct the firmware stream
s/^Input/The Input/
s/configure/configures the/
s/construct/constructs/
> +configuration and send commands to firmware and get response from hardware and
s/send/sends/
s/get response/gets responses/
> +firmware and then return buffers to user.
s/return/returns/
So control of the ISYS goes through the firmware, the driver doesn't
access the hardware directly ?
> +The ISYS is represented as several V4L2 sub-devices - 'Intel IPU6 CSI2 $port',
> +which provide V4L2 subdev interfaces to the user space, there are also several
> +video nodes for each CSI-2 stream capture - 'Intel IPU6 ISYS capture $num' which
> +provide interface to user to set formats, queue buffers and streaming.
> +
> +.. kernel-figure:: ipu6_isys_graph.svg
> + :alt: ipu6 isys media graph
I see in the figure 6 CSI-2 receivers and 4 video nodes. Are those CSI-2
receivers independent of each other, or do they share SoCs pins ? For
instance, I'm thinking about a use case where you would have 4 data
lanes and 2 clock lanes, and support capturing from 2x 2-lanes sensors
with 2 CSI-2 RX, or 1x 4-lanes sensor with 1 CSI-2 RX. More generally,
can you document the input options of the ISYS ? For DT-based systems
I'd expect this information to be in the DT bindings, here it needs to
be documented separately.
On the video device node side, are there 4 independent hardware DMA
engines that can be dynamically connected to the different CSI-2
receivers, or is that what the current firmware version provide, with
the hardware able to capture more than 4 streams with firmware
modifications ?
> +
> +Capturing frames by IPU6 ISYS
> +------------------------------------
> +
> +IPU6 ISYS is used to capture frames from the camera sensors connected to the
> +CSI2 port. The supported input formats of ISYS are listed in table below:
s/port/ports/
> +
> +.. tabularcolumns:: |p{0.8cm}|p{4.0cm}|p{4.0cm}|
> +
> +.. flat-table::
> + :header-rows: 1
> +
> + * - IPU6 ISYS supported input formats
> +
> + * - RGB565, RGB888
> +
> + * - UYVY8, YUYV8
Unless I'm mistaken, CSI-2 doesn't have separate UYVY and YUYV formats.
Am I missing something ?
> +
> + * - RAW8, RAW10, RAW12
Is embedded data capture supported ? More generically, can we capture
different data types and/or virtual channels from the same CSI-2 input ?
What's the maximum resolution supported by the ISYS ? Are the DMA
engines independent, or would the maximum resolution be different if you
capture from a single camera sensor or multiple camera sensors at the
same time ?
> +
> +Here is an example of IPU6 ISYS raw capture on Dell XPS 9315 laptop. On this
> +machine, ov01a10 sensor is connected to IPU ISYS CSI2 port 2, which can
> +generate images at sBGGR10 with resolution 1280x800.
> +
> +Using the media controller APIs, we can configure ov01a10 sensor by
> +media-ctl [#f1]_ and yavta [#f2]_ to transmit frames to IPU6 ISYS.
> +
> +.. code-block:: none
> +
> + # This example assumes /dev/media0 as the IPU ISYS media device
> + export MDEV=/dev/media0
> +
> + # Establish the link for the media devices using media-ctl
> + media-ctl -d $MDEV -l "\"ov01a10 3-0036\":0 -> \"Intel IPU6 CSI2 2\":0[1]"
> +
> + # Set the format for the media devices
> + media-ctl -d $MDEV -V "ov01a10:0 [fmt:SBGGR10/1280x800]"
> + media-ctl -d $MDEV -V "Intel IPU6 CSI2 2:0 [fmt:SBGGR10/1280x800]"
> + media-ctl -d $MDEV -V "Intel IPU6 CSI2 2:1 [fmt:SBGGR10/1280x800]"
> +
> + # Establish the link for the media devices using media-ctl
> + media-ctl -d $MDEV -l "\"ov01a10 3-0036\":0 -> \"Intel IPU6 CSI2 2\":0[1]"
> + media-ctl -d $MDEV -l "\"Intel IPU6 CSI2 2\":1 ->\"Intel IPU6 ISYS Capture 0\":0[5]"
> +
> +Once the media pipeline is configured, desired sensor specific settings
> +(such as exposure and gain settings) can be set, using the yavta tool.
> +
> +e.g
> +
> +.. code-block:: none
> +
> + # and that ov01a10 sensor is connected to i2c bus 3 with address 0x36
> + export SDEV=$(media-ctl -d $MDEV -e "ov01a10 3-0036")
> +
> + yavta -w 0x009e0903 400 $SDEV
> + yavta -w 0x009e0913 1000 $SDEV
> + yavta -w 0x009e0911 2000 $SDEV
> +
> +Once the desired sensor settings are set, frame captures can be done as below.
> +
> +e.g
> +
> +.. code-block:: none
> +
> + yavta --data-prefix -u -c10 -n5 -I -s 1280x800 --file=/tmp/frame-#.bin \
> + -f SBGGR10 $(media-ctl -d $MDEV -e "Intel IPU6 ISYS Capture 0")
> +
> +With the above command, 10 frames are captured at 1280x800 resolution with
> +sBGGR10 format. The captured frames are available as /tmp/frame-#.bin files.
> +
> +
> +References
> +==========
> +
> +.. [#f1] https://git.ideasonboard.org/?p=media-ctl.git;a=summary
> +.. [#f2] https://git.ideasonboard.org/yavta.git
> diff --git a/Documentation/admin-guide/media/ipu6_isys_graph.svg b/Documentation/admin-guide/media/ipu6_isys_graph.svg
> new file mode 100644
> index 000000000000..661aee18dbe2
> --- /dev/null
> +++ b/Documentation/admin-guide/media/ipu6_isys_graph.svg
> @@ -0,0 +1,338 @@
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> diff --git a/Documentation/admin-guide/media/v4l-drivers.rst b/Documentation/admin-guide/media/v4l-drivers.rst
> index 1c41f87c3917..f6328a242cbe 100644
> --- a/Documentation/admin-guide/media/v4l-drivers.rst
> +++ b/Documentation/admin-guide/media/v4l-drivers.rst
> @@ -16,6 +16,7 @@ Video4Linux (V4L) driver-specific documentation
> imx
> imx7
> ipu3
> + ipu6-isys
> ivtv
> omap3isp
> omap4_camera
--
Regards,
Laurent Pinchart
