[PATCH v1 0/2] Document Intel IPU3 ImgU driver and uAPI

[PATCH v1 0/2] Document Intel IPU3 ImgU driver and uAPI

[Yong Zhi]

Hi, All,

This patch set adds documentation on Intel IPU3 ImgU driver and its uAPI, based
on the feedback received for v1 RFC below and ImgU driver patch series:

v1 RFC:
<URL:https://patchwork.kernel.org/patch/10321897/>

ImgU v6:
<URL:https://patchwork.kernel.org/patch/10316739/>

Few unused structs have being removed from intel-ipu3.h since v6. This patch set
will be merged into the next ImgU driver update.

Rajmohan Mani (1):
  doc-rst: Add Intel IPU3 documentation

Yong Zhi (1):
  v4l: Document Intel IPU3 meta data uAPI

 Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
 .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
 Documentation/media/v4l-drivers/index.rst          |    1 +
 Documentation/media/v4l-drivers/ipu3.rst           |  304 +++
 include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
 5 files changed, 3296 insertions(+)
 create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
 create mode 100644 Documentation/media/v4l-drivers/ipu3.rst
 create mode 100644 include/uapi/linux/intel-ipu3.h

-- 
2.7.4

[PATCH v1 1/2] doc-rst: Add Intel IPU3 documentation

[Yong Zhi]

From: Rajmohan Mani <rajmohan.mani@intel.com>

This patch adds the details about the IPU3 Imaging Unit driver.

Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Tian Shu Qiu <tian.shu.qiu@intel.com>
---
 Documentation/media/v4l-drivers/index.rst |   1 +
 Documentation/media/v4l-drivers/ipu3.rst  | 304 ++++++++++++++++++++++++++++++
 2 files changed, 305 insertions(+)
 create mode 100644 Documentation/media/v4l-drivers/ipu3.rst

diff --git a/Documentation/media/v4l-drivers/index.rst b/Documentation/media/v4l-drivers/index.rst
index 679238e..179a393 100644
--- a/Documentation/media/v4l-drivers/index.rst
+++ b/Documentation/media/v4l-drivers/index.rst
@@ -44,6 +44,7 @@ For more details see the file COPYING in the source distribution of Linux.
 	davinci-vpbe
 	fimc
 	imx
+	ipu3
 	ivtv
 	max2175
 	meye
diff --git a/Documentation/media/v4l-drivers/ipu3.rst b/Documentation/media/v4l-drivers/ipu3.rst
new file mode 100644
index 0000000..a4550d8
--- /dev/null
+++ b/Documentation/media/v4l-drivers/ipu3.rst
@@ -0,0 +1,304 @@
+.. include:: <isonum.txt>
+
+===============================================================
+Intel Image Processing Unit 3 (IPU3) Imaging Unit (ImgU) driver
+===============================================================
+
+Copyright |copy| 2018 Intel Corporation
+
+Introduction
+============
+
+This file documents Intel IPU3 (3rd generation Image Processing Unit) Imaging
+Unit driver located under drivers/media/pci/intel/ipu3.
+
+The Intel IPU3 found in certain Kaby Lake (as well as certain Sky Lake)
+platforms (U/Y processor lines) is made up of two parts namely Imaging Unit
+(ImgU) and CIO2 device (MIPI CSI2 receiver).
+
+The CIO2 device receives the raw bayer data from the sensors and outputs the
+frames in a format that is specific to IPU3 (for consumption by IPU3 ImgU).
+CIO2 driver is available as drivers/media/pci/intel/ipu3/ipu3-cio2* and is
+enabled through the CONFIG_VIDEO_IPU3_CIO2 config option.
+
+The Imaging Unit (ImgU) is responsible for processing images captured
+through IPU3 CIO2 device. The ImgU driver sources can be found under
+drivers/media/pci/intel/ipu3 directory. The driver is enabled through the
+CONFIG_VIDEO_IPU3_IMGU config option.
+
+The two driver modules are named ipu3-csi2 and ipu3-imgu, respectively.
+
+The driver has been tested on Kaby Lake platforms (U/Y processor lines).
+
+The driver implements V4L2, Media controller and V4L2 sub-device interfaces.
+Camera sensors that have CSI-2 bus, which are connected to the IPU3 CIO2
+device are supported. Support for lens and flash drivers depends on the
+above sensors.
+
+ImgU device nodes
+=================
+
+The ImgU is represented as a single V4L2 subdev, which provides a V4L2 subdev
+interface to the user space.
+
+CIO2 device
+===========
+
+The CIO2 is represented as a single V4L2 subdev, which provides a V4L2 subdev
+interface to the user space. There is a video node for each CSI-2 receiver,
+with a single media controller interface for the entire device.
+
+Media controller
+----------------
+
+The media device interface allows to configure the ImgU links, which defines
+the behavior of the IPU3 firmware. The link configuration tells the firmware
+whether viewfinder or postview ISP pipeline should be enabled.
+
+Device operation
+----------------
+
+With IPU3, once the input video node ("ipu3-imgu":0, in <entity>:<pad-number>
+format) is queued with buffer (in packed raw bayer format), IPU3 ISP starts
+processing the buffer and produces the video output in YUV format and
+statistics output on respective output nodes. The driver is expected to have
+buffers ready for all of parameter, output and statistics nodes, when input
+video node is queued with buffer.
+
+At a minimum, all of input, main output, 3A statistics, and either of
+viewfinder or postview video nodes should be enabled for IPU3 to start image
+processing. viewfinder and postview video nodes are mutually exclusive.
+
+input, output, viewfinder and postview video nodes
+--------------------------------------------------
+
+The frames (in packed raw bayer format specific to IPU3) received by the
+input video node is processed by the IPU3 Imaging Unit and is output to 2
+video nodes, with each targeting different purpose (main output and viewfinder
+or postview output).
+
+Details on raw bayer format specific to IPU3 can be found as below.
+Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
+
+The driver supports V4L2 Video Capture Interface as defined at :ref:`devices`.
+
+Only the multi-planar API is supported. More details can be found at
+:ref:`planar-apis`.
+
+
+parameters video node
+---------------------
+
+The parameter video node receives the ISP algorithm parameters that are used
+to configure how the ISP algorithms process the image.
+
+Details on raw bayer format specific to IPU3 can be found as below.
+Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
+
+3A statistics video node
+------------------------
+
+3A statistics video node is used by the ImgU driver to output the 3A (auto
+focus, auto exposure and auto white balance) statistics for the frames that
+are being processed by the ISP to user space applications. User space
+applications can use this statistics data to arrive at desired algorithm
+parameters for ISP.
+
+CIO2 device nodes
+=================
+
+CIO2 is represented as a single V4L2 sub-device with a video node for each
+CSI-2 receiver. The video node represents the DMA engine.
+
+Configuring the Intel IPU3
+==========================
+
+The Intel IPU3 ImgU driver supports V4L2 interface. Using V4L2 ioctl calls,
+the ISP can be configured and enabled.
+
+The IPU3 ImgU pipelines can be configured using media controller APIs,
+defined at :ref:`media_controller`.
+
+Capturing frames in raw bayer format
+------------------------------------
+
+IPU3 MIPI CSI2 receiver is used to capture frames (in packed raw bayer
+format) from the raw sensors connected to the CSI2 ports. The captured
+frames are used as input to the ImgU driver.
+
+Image processing using IPU3 ImgU requires tools such as v4l2n [#f1]_,
+raw2pnm [#f1]_, and yavta [#f2]_ due to the following unique requirements
+and / or features specific to IPU3.
+
+-- The IPU3 CSI2 receiver outputs the captured frames from the sensor in
+packed raw bayer format that is specific to IPU3
+
+-- Multiple video nodes have to be operated simultaneously
+
+Let us take the example of ov5670 sensor connected to CSI2 port 0, for a
+2592x1944 image capture.
+
+Using the media contorller APIs, the ov5670 sensor is configured to send
+frames in packed raw bayer format to IPU3 CSI2 receiver.
+
+# This example assumes /dev/media0 as the ImgU media device
+
+export MDEV=/dev/media0
+
+# and that ov5670 sensor is connected to i2c bus 10 with address 0x36
+
+export SDEV="ov5670 10-0036"
+
+# Establish the link for the media devices using media-ctl [#f3]_
+media-ctl -d $MDEV -l "ov5670 ":0 -> "ipu3-csi2 0":0[1]
+
+media-ctl -d $MDEV -l "ipu3-csi2 0":1 -> "ipu3-cio2 0":0[1]
+
+# Set the format for the media devices
+media-ctl -d $MDEV -V "ov5670 ":0 [fmt:SGRBG10/2592x1944]
+
+media-ctl -d $MDEV -V "ipu3-csi2 0":0 [fmt:SGRBG10/2592x1944]
+
+media-ctl -d $MDEV -V "ipu3-csi2 0":1 [fmt:SGRBG10/2592x1944]
+
+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
+
+yavta -w 0x009e0903 444 $(media-ctl -d $MDEV -e "$SDEV")
+
+yavta -w 0x009e0913 1024 $(media-ctl -d $MDEV -e "$SDEV")
+
+yavta -w 0x009e0911 2046 $(media-ctl -d $MDEV -e "$SDEV")
+
+Once the desired sensor settings are set, frame captures can be done as below.
+
+e.g
+
+yavta --data-prefix -u -c10 -n5 -I -s2592x1944 --file=/tmp/frame-#.bin
+-f IPU3_GRBG10 media-ctl -d $MDEV -e ipu3-cio2 0
+
+With the above command, 10 frames are captured at 2592x1944 resolution, with
+sGRBG10 format and output as IPU3_GRBG10 format.
+
+The captured frames are available as /tmp/frame-#.bin files.
+
+Processing the image in raw bayer format
+----------------------------------------
+
+Configuring ImgU V4L2 subdev for image processing
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ImgU V4L2 subdev has to be configured with media controller APIs to
+have all the video nodes setup correctly.
+
+media-ctl -d $MDEV -l "ipu3-imgu":2 -> "output":0[1]
+
+media-ctl -d $MDEV -l "ipu3-imgu":3 -> "viewfinder":0[0]
+
+media-ctl -d $MDEV -l "ipu3-imgu":4 -> "postview":0[1]
+
+media-ctl -d $MDEV -l "ipu3-imgu":5 -> "3a stat":0[1]
+
+In this particular example, postview node is enabled.
+
+RAW bayer frames go through the following ISP pipeline HW blocks to
+have the processed image output to the DDR memory.
+
+RAW bayer frame -> Input Feeder -> Bayer Down Scaling (BDS) -> Geometric
+Distortion Correction (GDC) -> DDR
+
+The ImgU V4L2 subdev has to be configured with the supported resolutions
+in all the above HW blocks, for a given input resolution.
+
+For a given supported resolution for an input frame, the Input Feeder,
+Bayer Down Scaling and GDC blocks should be configured with the supported
+resolutions. This information can be obtained by looking at the following
+IPU3 ISP configuration table.
+
+https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/master
+
+Under baseboard-poppy/media-libs/arc-camera3-hal-configs-poppy/files/gcss
+directory, graph_settings_ov5670.xml can be used as an example.
+
+The following steps prepare the ImgU ISP pipeline for the image processing.
+
+1. The ImgU V4L2 subdev data format should be set by using the
+VIDIOC_SUBDEV_S_FMT on pad 0, using the GDC width and height obtained above.
+
+2. The ImgU V4L2 subdev cropping should be set by using the
+VIDIOC_SUBDEV_S_SELECTION on pad 0, with V4L2_SEL_TGT_CROP as the target,
+using the input feeder height and width.
+
+3. The ImgU V4L2 subdev composing should be set by using the
+VIDIOC_SUBDEV_S_SELECTION on pad 0, with V4L2_SEL_TGT_COMPOSE as the target,
+using the BDS height and width.
+
+For the ov5670 example, for an input frame with a resolution of 2592x1944
+(which is input to the ImgU subdev pad 0), the corresponding resolutions
+for input feeder, BDS and GDC are 2592x1944, 2592x1944 and 2560x1920
+respectively.
+
+Once this is done, the received raw bayer frames can be input to the ImgU
+V4L2 subdev as below, using the open source application v4l2n.
+
+For an image captured with 2592x1944 [#f4]_ resolution, with desired output
+resolution as 2560x1920 and viewfinder resolution as 2560x1920, the following
+v4l2n command can be used. This helps process the raw bayer frames and
+produces the desired results for the main output image and the viewfinder
+output, in NV12 format.
+
+v4l2n --pipe=4 --load=/tmp/frame-#.bin --open=$MDEV
+--fmt=type:VIDEO_OUTPUT_MPLANE,width=2592,height=1944,pixelformat=0X47337069
+--reqbufs=type:VIDEO_OUTPUT_MPLANE,count:1 --pipe=1 --output=/tmp/frames.out
+--open= --fmt=type:VIDEO_CAPTURE_MPLANE,width=2560,height=1920,pixelformat=NV12
+--reqbufs=type:VIDEO_CAPTURE_MPLANE,count:1 --pipe=2 --output=/tmp/frames.vf
+--open= --fmt=type:VIDEO_CAPTURE_MPLANE,width=2560,height=1920,pixelformat=NV12
+--reqbufs=type:VIDEO_CAPTURE_MPLANE,count:1 --pipe=3 --open=
+--output=/tmp/frames.3A --fmt=type:META_CAPTURE,?
+--reqbufs=count:1,type:META_CAPTURE --pipe=1,2,3,4 --stream=5
+
+Converting the raw bayer image into YUV domain
+----------------------------------------------
+
+The processed images after the above step, can be converted to YUV domain
+as below.
+
+Main output frames
+~~~~~~~~~~~~~~~~~~
+
+raw2pnm -x2560 -y1920 -fNV12 /tmp/frames.out /tmp/frames.out.pnm
+
+where 2560x1920 is output resolution, NV12 is the video format, followed
+by input frame and output PNM file.
+
+Viewfinder output frames
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+raw2pnm -x2560 -y1920 -fNV12 /tmp/frames.vf /tmp/frames.vf.pnm
+
+where 2560x1920 is output resolution, NV12 is the video format, followed
+by input frame and output PNM file.
+
+Example user space code for IPU3
+================================
+
+User space code that configures and uses IPU3 is available here.
+
+https://chromium.googlesource.com/chromiumos/platform/arc-camera/+/master/
+
+The source can be located under hal/intel directory.
+
+References
+==========
+
+include/uapi/linux/intel-ipu3.h
+
+.. [#f1] https://github.com/intel/nvt
+
+.. [#f2] http://git.ideasonboard.org/yavta.git
+
+.. [#f3] http://git.ideasonboard.org/?p=media-ctl.git;a=summary
+
+.. [#f4] ImgU limitation requires an additional 16x16 for all input resolutions
-- 
2.7.4

[PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Yong Zhi]

These meta formats are used on Intel IPU3 ImgU video queues
to carry 3A statistics and ISP pipeline parameters.

V4L2_META_FMT_IPU3_3A
V4L2_META_FMT_IPU3_PARAMS

Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Chao C Li <chao.c.li@intel.com>
Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
---
 Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
 .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
 include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
 3 files changed, 2991 insertions(+)
 create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
 create mode 100644 include/uapi/linux/intel-ipu3.h

diff --git a/Documentation/media/uapi/v4l/meta-formats.rst b/Documentation/media/uapi/v4l/meta-formats.rst
index 0c4e1ec..b887fca 100644
--- a/Documentation/media/uapi/v4l/meta-formats.rst
+++ b/Documentation/media/uapi/v4l/meta-formats.rst
@@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata` interface only.
 .. toctree::
     :maxdepth: 1
 
+    pixfmt-meta-intel-ipu3
     pixfmt-meta-uvc
     pixfmt-meta-vsp1-hgo
     pixfmt-meta-vsp1-hgt
diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
new file mode 100644
index 0000000..5c050e6
--- /dev/null
+++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
@@ -0,0 +1,174 @@
+.. -*- coding: utf-8; mode: rst -*-
+
+.. _intel-ipu3:
+
+******************************************************************
+V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A ('ip3s')
+******************************************************************
+
+.. c:type:: ipu3_uapi_stats_3a
+
+3A statistics
+=============
+
+For IPU3 ImgU, the 3A statistics accelerators collect different statistics over
+an input bayer frame. Those statistics, defined in data struct
+:c:type:`ipu3_uapi_stats_3a`, are meta output obtained from "ipu3-imgu 3a stat"
+video node, which are then passed to user space for statistics analysis
+using :c:type:`v4l2_meta_format` interface.
+
+The statistics collected are AWB (Auto-white balance) RGBS cells, AWB filter
+response, AF (Auto-focus) filter response, and AE (Auto-exposure) histogram.
+
+struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for all above.
+
+
+.. code-block:: c
+
+
+     struct ipu3_uapi_stats_3a {
+	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
+	struct ipu3_uapi_ae_raw_buffer_aligned
+			ae_raw_buffer[IPU3_UAPI_MAX_STRIPES];
+	struct ipu3_uapi_af_raw_buffer af_raw_buffer;
+	struct ipu3_uapi_awb_fr_raw_buffer awb_fr_raw_buffer;
+	struct ipu3_uapi_4a_config stats_4a_config;
+	__u32 ae_join_buffers;
+	__u8 padding[28];
+	struct ipu3_uapi_stats_3a_bubble_info_per_stripe
+			stats_3a_bubble_per_stripe;
+	struct ipu3_uapi_ff_status stats_3a_status;
+     } __packed;
+
+
+.. c:type:: ipu3_uapi_params
+
+Pipeline parameters
+===================
+
+IPU3 pipeline has a number of image processing stages, each of which takes a
+set of parameters as input. The major stages of pipelines are shown here:
+
+Raw pixels -> Bayer Downscaling -> Optical Black Correction ->
+
+Linearization -> Lens Shading Correction -> White Balance / Exposure /
+
+Focus Apply -> Bayer Noise Reduction -> ANR -> Demosaicing -> Color
+
+Correction Matrix -> Gamma correction -> Color Space Conversion ->
+
+Chroma Down Scaling -> Chromatic Noise Reduction -> Total Color
+
+Correction -> XNR3 -> TNR -> DDR
+
+The table below presents a description of the above algorithms.
+
+======================== =======================================================
+Name			 Description
+======================== =======================================================
+Optical Black Correction Optical Black Correction block subtracts a pre-defined
+			 value from the respective pixel values to obtain better
+			 image quality.
+			 Defined in :c:type:`ipu3_uapi_obgrid_param`.
+Linearization		 This algo block uses linearization parameters to
+			 address non-linearity sensor effects. The Lookup table
+			 table is defined in
+			 :c:type:`ipu3_uapi_isp_lin_vmem_params`.
+SHD			 Lens shading correction is used to correct spatial
+			 non-uniformity of the pixel response due to optical
+			 lens shading. This is done by applying a different gain
+			 for each pixel. The gain, black level etc are
+			 configured in :c:type:`ipu3_uapi_shd_config_static`.
+BNR			 Bayer noise reduction block removes image noise by
+			 applying a bilateral filter.
+			 See :c:type:`ipu3_uapi_bnr_static_config` for details.
+ANR			 Advanced Noise Reduction is a block based algorithm
+			 that performs noise reduction in the Bayer domain. The
+			 convolution matrix etc can be found in
+			 :c:type:`ipu3_uapi_anr_config`.
+Demosaicing		 Demosaicing converts raw sensor data in Bayer format
+			 into RGB (Red, Green, Blue) presentation. Then add
+			 outputs of estimation of Y channel for following stream
+			 processing by Firmware. The struct is defined as
+			 :c:type:`ipu3_uapi_dm_config`.
+Color Correction	 Color Correction algo transforms sensor specific color
+			 space to the standard "sRGB" color space. This is done
+			 by applying 3x3 matrix defined in
+			 :c:type:`ipu3_uapi_ccm_mat_config`.
+Gamma correction	 Gamma correction :c:type:`ipu3_uapi_gamma_config` is a
+			 basic non-linear tone mapping correction that is
+			 applied per pixel for each pixel component.
+CSC			 Color space conversion transforms each pixel from the
+			 RGB primary presentation to YUV (Y - brightness,
+			 UV - Luminance) presentation. This is done by applying
+			 a 3x3 matrix defined in
+			 :c:type:`ipu3_uapi_csc_mat_config`
+CDS			 Chroma down sampling
+			 After the CSC is performed, the Chroma Down Sampling
+			 is applied for a UV plane down sampling by a factor
+			 of 2 in each direction for YUV 4:2:0 using a 4x2
+			 configurable filter :c:type:`ipu3_uapi_cds_params`.
+CHNR			 Chroma noise reduction
+			 This block processes only the chrominance pixels and
+			 performs noise reduction by cleaning the high
+			 frequency noise.
+			 See struct :c:type:`ipu3_uapi_yuvp1_chnr_config`.
+TCC			 Total color correction as defined in struct
+			 :c:type:`ipu3_uapi_yuvp2_tcc_static_config`.
+XNR3			 eXtreme Noise Reduction V3 is the third revision of
+			 noise reduction algorithm used to improve image
+			 quality. This removes the low frequency noise in the
+			 captured image. Two related structs are  being defined,
+			 :c:type:`ipu3_uapi_isp_xnr3_params` for ISP data memory
+			 and :c:type:`ipu3_uapi_isp_xnr3_vmem_params` for vector
+			 memory.
+TNR			 Temporal Noise Reduction block compares successive
+			 frames in time to remove anamolies / noise in pixel
+			 values. :c:type:`ipu3_uapi_isp_tnr3_vmem_params` and
+			 :c:type:`ipu3_uapi_isp_tnr3_params` are defined for ISP
+			 vector and data memory respectively.
+======================== =======================================================
+
+A few stages of the pipe will be executed by firmware running on the ISP
+processor, while many others will use a set of fixed hardware blocks also
+called accelerator cluster (ACC) to crunch pixel data and produce statistics.
+
+ACC parameters as defined by :c:type:`ipu3_uapi_acc_param`, can be selectively
+enabled / disabled by the user space through struct :c:type:`ipu3_uapi_flags`
+embedded in :c:type:`ipu3_uapi_params` structure.
+
+Both 3A statistics and pipeline parameters described here are closely tied to
+the underlying camera sub-system (CSS) APIs. They are usually consumed and
+produced by dedicated user space libraries that comprise the important tuning
+tools, thus freeing the developers from being bothered with the low level
+hardware and algorithm details.
+
+The meta data :c:type:`ipu3_uapi_params` will be sent to "ipu3-imgu parameters"
+video node in ``V4L2_BUF_TYPE_META_CAPTURE`` format.
+
+.. code-block:: c
+
+    struct ipu3_uapi_params {
+	/* Flags which of the settings below are to be applied */
+	IPU3_ALIGN struct ipu3_uapi_flags use;
+
+	/* Accelerator cluster parameters */
+	struct ipu3_uapi_acc_param acc_param;
+
+	/* ISP vector parameters */
+	struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
+	struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
+	struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
+
+	/* ISP data memory parameters */
+	struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
+	struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
+
+	/* Optical black level compensation */
+	struct ipu3_uapi_obgrid_param obgrid_param;
+    } __packed;
+
+Intel IPU3 ImgU uAPI data types
+===============================
+
+.. kernel-doc:: include/uapi/linux/intel-ipu3.h
diff --git a/include/uapi/linux/intel-ipu3.h b/include/uapi/linux/intel-ipu3.h
new file mode 100644
index 0000000..644c83f
--- /dev/null
+++ b/include/uapi/linux/intel-ipu3.h
@@ -0,0 +1,2816 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2017 - 2018 Intel Corporation */
+
+#ifndef __IPU3_UAPI_H
+#define __IPU3_UAPI_H
+
+#include <linux/bitmap.h>
+#include <linux/types.h>
+
+/********************* Key Acronyms *************************/
+/*
+ * ACC - Accelerator cluster
+ * ANR - Adaptive noise reduction
+ * AWB_FR- Auto white balance filter response statistics
+ * BNR - Bayer noise reduction parameters
+ * BDS - Bayer downscaler parameters
+ * CCM - Color correction matrix coefficients
+ * CDS - Chroma down sample
+ * CHNR - Chroma noise reduction
+ * CSC - Color space conversion
+ * DM - De-mosaic
+ * IEFd - Image enhancement filter directed
+ * Obgrid - Optical black level compensation
+ * OSYS - Output system configuration
+ * ROI - Region of interest
+ * SHD - Lens shading correction table
+ * TCC - Total color correction
+ * YDS - Y down sampling
+ * YTM - Y-tone mapping
+ */
+
+#define IPU3_UAPI_ISP_WORD_BYTES			32
+#define IMGU_ABI_PAD	__aligned(IPU3_UAPI_ISP_WORD_BYTES)
+#define IPU3_ALIGN	__attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
+
+/******************* ipu3_uapi_stats_3a *******************/
+
+#define IPU3_UAPI_MAX_STRIPES				2
+#define IPU3_UAPI_MAX_BUBBLE_SIZE			10
+
+#define IPU3_UAPI_GRID_START_MASK			(BIT(12) - 1)
+#define IPU3_UAPI_GRID_Y_START_EN			BIT(15)
+
+/* controls generation of meta_data (like FF enable/disable) */
+#define IPU3_UAPI_AWB_RGBS_THR_B_EN			BIT(14)
+#define IPU3_UAPI_AWB_RGBS_THR_B_INCL_SAT		BIT(15)
+
+/**
+ * struct ipu3_uapi_grid_config - Grid plane config
+ *
+ * @width:	Grid horizontal dimensions, in number of grid blocks(cells).
+ * @height:	Grid vertical dimensions, in number of grid cells.
+ * @block_width_log2:	Log2 of the width of each cell in pixels.
+ *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
+ * @block_height_log2:	Log2 of the height of each cell in pixels.
+ *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
+ * @height_per_slice:	The number of blocks in vertical axis per slice.
+ *			Default 2.
+ * @x_start: X value of top left corner of Region of Interest(ROI).
+ * @y_start: Y value of top left corner of ROI
+ * @x_end: X value of bottom right corner of ROI
+ * @y_end: Y value of bottom right corner of ROI
+ *
+ * Due to the size of total amount of collected data, most statistics
+ * create a grid-based output, and the data is then divided into "slices".
+ */
+struct ipu3_uapi_grid_config {
+	__u8 width;
+	__u8 height;
+	__u16 block_width_log2:3;
+	__u16 block_height_log2:3;
+	__u16 height_per_slice:8;
+	__u16 x_start;
+	__u16 y_start;
+	__u16 x_end;
+	__u16 y_end;
+} __packed;
+
+/*
+ * The grid based data is divided into "slices" called set, each slice of setX
+ * refers to ipu3_uapi_grid_config width * height_per_slice.
+ */
+#define IPU3_UAPI_AWB_MAX_SETS				60
+#define IPU3_UAPI_AWB_SET_SIZE				0x500
+#define IPU3_UAPI_AWB_MD_ITEM_SIZE			8
+#define IPU3_UAPI_AWB_SPARE_FOR_BUBBLES \
+	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
+	 IPU3_UAPI_AWB_MD_ITEM_SIZE)
+#define IPU3_UAPI_AWB_MAX_BUFFER_SIZE \
+	(IPU3_UAPI_AWB_MAX_SETS * \
+	 (IPU3_UAPI_AWB_SET_SIZE + IPU3_UAPI_AWB_SPARE_FOR_BUBBLES))
+/**
+ * struct ipu3_uapi_awb_meta_data - AWB meta data
+ *
+ * @meta_data_buffer:	Average values for each color channel
+ */
+struct ipu3_uapi_awb_meta_data {
+	__u8 meta_data_buffer[IPU3_UAPI_AWB_MAX_BUFFER_SIZE];
+} __packed;
+
+/**
+ * struct ipu3_uapi_awb_raw_buffer - AWB raw buffer
+ *
+ * @meta_data: buffer to hold auto white balance meta data.
+ */
+struct ipu3_uapi_awb_raw_buffer {
+	struct ipu3_uapi_awb_meta_data meta_data;
+} __packed;
+
+/**
+ * struct ipu3_uapi_awb_config_s - AWB config
+ *
+ * @rgbs_thr_gr: gr threshold value.
+ * @rgbs_thr_r: Red threshold value.
+ * @rgbs_thr_gb: gb threshold value.
+ * @rgbs_thr_b: Blue threshold value.
+ * @grid: &ipu3_uapi_grid_config, the default grid resolution is 16x16 cells.
+ *
+ * The threshold is a saturation measure range [0..8191], 8191 is default.
+ * Values over threshold may be optionally rejected for averaging.
+ */
+struct ipu3_uapi_awb_config_s {
+	__u16 rgbs_thr_gr;
+	__u16 rgbs_thr_r;
+	__u16 rgbs_thr_gb;
+	__u16 rgbs_thr_b;
+	struct ipu3_uapi_grid_config grid;
+} IPU3_ALIGN __packed;
+
+/**
+ * struct ipu3_uapi_awb_config - AWB config wrapper
+ *
+ * @config: config for auto white balance as defined by &ipu3_uapi_awb_config_s
+ */
+struct ipu3_uapi_awb_config {
+	IPU3_ALIGN struct ipu3_uapi_awb_config_s config;
+} __packed;
+
+#define IPU3_UAPI_AE_COLORS				4	/* R, G, B, Y */
+#define IPU3_UAPI_AE_BINS				256
+#define IPU3_UAPI_AE_WEIGHTS				96
+
+/**
+ * struct ipu3_uapi_ae_raw_buffer - AE global weighted histogram
+ *
+ * @vals: Sum of IPU3_UAPI_AE_COLORS in cell
+ *
+ * Each histogram contains IPU3_UAPI_AE_BINS bins. Each bin has 24 bit unsigned
+ * for counting the number of the pixel.
+ */
+struct ipu3_uapi_ae_raw_buffer {
+	__u32 vals[IPU3_UAPI_AE_BINS * IPU3_UAPI_AE_COLORS];
+} __packed;
+
+/**
+ * struct ipu3_uapi_ae_raw_buffer_aligned - AE raw buffer
+ *
+ * @buff: &ipu3_uapi_ae_raw_buffer to hold full frame meta data.
+ */
+struct ipu3_uapi_ae_raw_buffer_aligned {
+	IPU3_ALIGN struct ipu3_uapi_ae_raw_buffer buff;
+} __packed;
+
+/**
+ * struct ipu3_uapi_ae_grid_config - AE weight grid
+ *
+ * @width: Grid horizontal dimensions. Value: [16,32], default 16.
+ * @height: Grid vertical dimensions. Value: [16,24], default 16.
+ * @block_width_log2: Log2 of the width of the grid cell, 2^3 = 16.
+ * @block_height_log2: Log2 of the height of the grid cell, 2^3 = 16.
+ * @__reserved0: reserved
+ * @ae_en: 0: does not write to meta-data array, 1: write normally.
+ * @rst_hist_array: write 1 to trigger histogram array reset.
+ * @done_rst_hist_array: flag for histogram array reset done.
+ * @x_start: X value of top left corner of ROI, default 0.
+ * @y_start: Y value of top left corner of ROI, default 0.
+ * @x_end: X value of bottom right corner of ROI
+ * @y_end: Y value of bottom right corner of ROI
+ *
+ * The AE block accumulates 4 global weighted histograms(R, G, B, Y) over
+ * a defined ROI within the frame. The contribution of each pixel into the
+ * histogram, defined by &ipu3_uapi_ae_weight_elem LUT, is indexed by a grid.
+ */
+struct ipu3_uapi_ae_grid_config {
+	__u8 width;
+	__u8 height;
+	__u8 block_width_log2:4;
+	__u8 block_height_log2:4;
+	__u8 __reserved0:5;
+	__u8 ae_en:1;
+	__u8 rst_hist_array:1;
+	__u8 done_rst_hist_array:1;
+	__u16 x_start;
+	__u16 y_start;
+	__u16 x_end;
+	__u16 y_end;
+} __packed;
+
+/**
+ * struct ipu3_uapi_ae_weight_elem - AE weights LUT
+ *
+ * @cell0: weighted histogram grid value.
+ * @cell1: weighted histogram grid value.
+ * @cell2: weighted histogram grid value.
+ * @cell3: weighted histogram grid value.
+ * @cell4: weighted histogram grid value.
+ * @cell5: weighted histogram grid value.
+ * @cell6: weighted histogram grid value.
+ * @cell7: weighted histogram grid value.
+ *
+ * Use weighted grid value to give a different contribution factor to each cell.
+ */
+struct ipu3_uapi_ae_weight_elem {
+	__u32 cell0:4;
+	__u32 cell1:4;
+	__u32 cell2:4;
+	__u32 cell3:4;
+	__u32 cell4:4;
+	__u32 cell5:4;
+	__u32 cell6:4;
+	__u32 cell7:4;
+} __packed;
+
+/**
+ * struct ipu3_uapi_ae_ccm - AE coefficients for WB and CCM
+ *
+ * @gain_gr: WB gain factor for the gr channels. Default 256.
+ * @gain_r: WB gain factor for the r channel. Default 256.
+ * @gain_b: WB gain factor for the b channel. Default 256.
+ * @gain_gb: WB gain factor for the gb channels. Default 256.
+ * @mat: 4x4 matrix that transforms Bayer quad output from WB to RGB+Y.
+ *
+ * Default:
+ *	128, 0, 0, 0,
+ *	0, 128, 0, 0,
+ *	0, 0, 128, 0,
+ *	0, 0, 0, 128,
+ *
+ * As part of the raw frame pre-process stage, the WB and color conversion need
+ * to be applied to expose the impact of these gain operations.
+ */
+struct ipu3_uapi_ae_ccm {
+	__u16 gain_gr;
+	__u16 gain_r;
+	__u16 gain_b;
+	__u16 gain_gb;
+	__s16 mat[16];
+} __packed;
+
+/**
+ * struct ipu3_uapi_ae_config - AE config
+ *
+ * @grid_cfg:	config for auto exposure statistics grid. See struct
+ *		&ipu3_uapi_ae_grid_config
+ * @weights:	&IPU3_UAPI_AE_WEIGHTS is based on 32x24 blocks in the grid.
+ *		Each grid cell has a corresponding value in weights LUT called
+ *		grid value, global histogram is updated based on grid value and
+ *		pixel value.
+ * @ae_ccm:	Color convert matrix pre-processing block.
+ *
+ * Calculate AE grid from image resolution, resample ae weights.
+ */
+struct ipu3_uapi_ae_config {
+	IPU3_ALIGN struct ipu3_uapi_ae_grid_config grid_cfg;
+	IPU3_ALIGN struct ipu3_uapi_ae_weight_elem weights[
+						IPU3_UAPI_AE_WEIGHTS];
+	IPU3_ALIGN struct ipu3_uapi_ae_ccm ae_ccm;
+} __packed;
+
+/**
+ * struct ipu3_uapi_af_filter_config - AF 2D filter for contrast measurements
+ *
+ * @y1_coeff_0:	filter Y1, structure: 3x11, support both symmetry and
+ *		anti-symmetry type. A12 is center, A1-A11 are neighbours.
+ *		for analyzing low frequency content, used to calculate sum
+ *		of gradients in x direction.
+ * @y1_coeff_0.a1:	filter1 coefficients A1, default 0.
+ * @y1_coeff_0.a2:	filter1 coefficients A2, default 0.
+ * @y1_coeff_0.a3:	filter1 coefficients A3, default 0.
+ * @y1_coeff_0.a4:	filter1 coefficients A4, default 0.
+ * @y1_coeff_1:		Struct
+ * @y1_coeff_1.a5:	filter1 coefficients A5, default 0.
+ * @y1_coeff_1.a6:	filter1 coefficients A6, default 0.
+ * @y1_coeff_1.a7:	filter1 coefficients A7, default 0.
+ * @y1_coeff_1.a8:	filter1 coefficients A8, default 0.
+ * @y1_coeff_2:		Struct
+ * @y1_coeff_2.a9:	filter1 coefficients A9, default 0.
+ * @y1_coeff_2.a10:	filter1 coefficients A10, default 0.
+ * @y1_coeff_2.a11:	filter1 coefficients A11, default 0.
+ * @y1_coeff_2.a12:	filter1 coefficients A12, default 128.
+ * @y1_sign_vec:	Each bit corresponds to one coefficient sign bit,
+ *			0: positive, 1: negative, default 0.
+ * @y2_coeff_0:	Y2, same structure as Y1. For analyzing high frequency content.
+ * @y2_coeff_0.a1:	filter2 coefficients A1, default 0.
+ * @y2_coeff_0.a2:	filter2 coefficients A2, default 0.
+ * @y2_coeff_0.a3:	filter2 coefficients A3, default 0.
+ * @y2_coeff_0.a4:	filter2 coefficients A4, default 0.
+ * @y2_coeff_1:	Struct
+ * @y2_coeff_1.a5:	filter2 coefficients A5, default 0.
+ * @y2_coeff_1.a6:	filter2 coefficients A6, default 0.
+ * @y2_coeff_1.a7:	filter2 coefficients A7, default 0.
+ * @y2_coeff_1.a8:	filter2 coefficients A8, default 0.
+ * @y2_coeff_2:	Struct
+ * @y2_coeff_2.a9:	filter1 coefficients A9, default 0.
+ * @y2_coeff_2.a10:	filter1 coefficients A10, default 0.
+ * @y2_coeff_2.a11:	filter1 coefficients A11, default 0.
+ * @y2_coeff_2.a12:	filter1 coefficients A12, default 128.
+ * @y2_sign_vec:	Each bit corresponds to one coefficient sign bit,
+ *			0: positive, 1: negative, default 0.
+ * @y_calc:	Pre-processing that converts Bayer quad to RGB+Y values to be
+ *		used for building histogram. Range [0..32], default 8.
+ * Rule:
+ *		y_gen_rate_gr + y_gen_rate_r + y_gen_rate_b + y_gen_rate_gb = 32
+ *		A single Y is calculated based on sum of Gr/R/B/Gb based on
+ *		their contribution ratio.
+ * @y_calc.y_gen_rate_gr:	Contribution ratio Gr for Y
+ * @y_calc.y_gen_rate_r:	Contribution ratio R for Y
+ * @y_calc.y_gen_rate_b:	Contribution ratio B for Y
+ * @y_calc.y_gen_rate_gb:	Contribution ratio Gb for Y
+ * @nf:	The shift right value that should be applied during the Y1/Y2 filter to
+ *	make sure the total memory needed is 2 bytes per grid cell.
+ * @nf.__reserved0:	reserved
+ * @nf.y1_nf:	Normalization factor for the convolution coeffs of y1,
+ *		should be log2 of the sum of the abs values of the filter
+ *		coeffs, default 7 (2^7 = 128).
+ * @nf.__reserved1:	reserved
+ * @nf.y2_nf:	Normalization factor for y2, should be log2 of the sum of the
+ *		abs values of the filter coeffs.
+ * @nf.__reserved2:	reserved
+ */
+struct ipu3_uapi_af_filter_config {
+	struct {
+		__u8 a1;
+		__u8 a2;
+		__u8 a3;
+		__u8 a4;
+	} y1_coeff_0;
+	struct {
+		__u8 a5;
+		__u8 a6;
+		__u8 a7;
+		__u8 a8;
+	} y1_coeff_1;
+	struct {
+		__u8 a9;
+		__u8 a10;
+		__u8 a11;
+		__u8 a12;
+	} y1_coeff_2;
+
+	__u32 y1_sign_vec;
+
+	struct {
+		__u8 a1;
+		__u8 a2;
+		__u8 a3;
+		__u8 a4;
+	} y2_coeff_0;
+	struct {
+		__u8 a5;
+		__u8 a6;
+		__u8 a7;
+		__u8 a8;
+	} y2_coeff_1;
+	struct {
+		__u8 a9;
+		__u8 a10;
+		__u8 a11;
+		__u8 a12;
+	} y2_coeff_2;
+
+	__u32 y2_sign_vec;
+
+	struct {
+		__u8 y_gen_rate_gr;
+		__u8 y_gen_rate_r;
+		__u8 y_gen_rate_b;
+		__u8 y_gen_rate_gb;
+	} y_calc;
+
+	struct {
+		__u32 __reserved0:8;
+		__u32 y1_nf:4;
+		__u32 __reserved1:4;
+		__u32 y2_nf:4;
+		__u32 __reserved2:12;
+	} nf;
+} __packed;
+
+#define IPU3_UAPI_AF_MAX_SETS				24
+#define IPU3_UAPI_AF_MD_ITEM_SIZE			4
+#define IPU3_UAPI_AF_SPARE_FOR_BUBBLES \
+	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
+	 IPU3_UAPI_AF_MD_ITEM_SIZE)
+#define IPU3_UAPI_AF_Y_TABLE_SET_SIZE			0x80
+#define IPU3_UAPI_AF_Y_TABLE_MAX_SIZE \
+	(IPU3_UAPI_AF_MAX_SETS * \
+	 (IPU3_UAPI_AF_Y_TABLE_SET_SIZE + IPU3_UAPI_AF_SPARE_FOR_BUBBLES) * \
+	 IPU3_UAPI_MAX_STRIPES)
+
+/**
+ * struct ipu3_uapi_af_meta_data - AF meta data
+ *
+ * @y_table:	Each color component will be convolved separately with filter1
+ *		and filter2 and the result will be summed out and averaged for
+ *		each cell.
+ */
+struct ipu3_uapi_af_meta_data {
+	__u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN;
+} __packed;
+
+/**
+ * struct ipu3_uapi_af_raw_buffer - AF raw buffer
+ *
+ * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus meta data.
+ */
+struct ipu3_uapi_af_raw_buffer {
+	IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data;
+} __packed;
+
+/**
+ * struct ipu3_uapi_af_config_s - AF config
+ *
+ * @filter_config: AF uses Y1 and Y2 filters as configured in
+ *		   &ipu3_uapi_af_filter_config
+ * @padding: paddings
+ * @grid_cfg: See &ipu3_uapi_grid_config, default resolution 16x16. Use large
+ *	      grid size for large image and vice versa.
+ */
+struct ipu3_uapi_af_config_s {
+	IPU3_ALIGN struct ipu3_uapi_af_filter_config filter_config;
+	__u8 padding[4];
+	IPU3_ALIGN struct ipu3_uapi_grid_config grid_cfg;
+} __packed;
+
+/**
+ * struct ipu3_uapi_af_config - AF config wrapper
+ *
+ * @config: config for auto focus as defined by &ipu3_uapi_af_config_s
+ */
+struct ipu3_uapi_af_config {
+	struct ipu3_uapi_af_config_s config;
+} __packed;
+
+#define IPU3_UAPI_AWB_FR_MAX_SETS			24
+#define IPU3_UAPI_AWB_FR_MD_ITEM_SIZE			8
+#define IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE			0x100
+#define IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES \
+	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
+	 IPU3_UAPI_AWB_FR_MD_ITEM_SIZE)
+#define IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE \
+	(IPU3_UAPI_AWB_FR_MAX_SETS * \
+	(IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE + \
+	 IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES) * IPU3_UAPI_MAX_STRIPES)
+/**
+ * struct ipu3_uapi_awb_fr_meta_data - AWB filter response meta data
+ *
+ * @bayer_table: Statistics output on the grid after convolving with 1D filter.
+ */
+struct ipu3_uapi_awb_fr_meta_data {
+	IPU3_ALIGN __u8 bayer_table[IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE];
+} __packed;
+
+/**
+ * struct ipu3_uapi_awb_fr_raw_buffer - AWB filter response raw buffer
+ *
+ * @meta_data: See &ipu3_uapi_awb_fr_meta_data.
+ */
+struct ipu3_uapi_awb_fr_raw_buffer {
+	struct ipu3_uapi_awb_fr_meta_data meta_data;
+} __packed;
+
+/**
+ * struct ipu3_uapi_awb_fr_config_s - AWB filter response config
+ *
+ * @grid_cfg:	grid config, default 16x16.
+ * @bayer_coeff:	1D Filter 1x11 center symmetry/anti-symmetry.
+ *			coeffcients defaults { 0, 0, 0, 0, 0, 128 }.
+ *			Applied on whole image for each Bayer channel separately
+ *			by a weighted sum of its 11x1 neighbors.
+ * @__reserved1:	reserved
+ * @bayer_sign:	sign of filter coeffcients, default 0.
+ * @bayer_nf:	normalization factor for the convolution coeffs, to make sure
+ *		total memory needed is within pre-determined range.
+ *		NF should be the log2 of the sum of the abs values of the
+ *		filter coeffs, range [7..14], default 7.
+ * @__reserved2:	reserved
+ */
+struct ipu3_uapi_awb_fr_config_s {
+	struct ipu3_uapi_grid_config grid_cfg;
+	__u8 bayer_coeff[6];
+	__u16 __reserved1;
+	__u32 bayer_sign;
+	__u8 bayer_nf;
+	__u8 __reserved2[3];
+} IPU3_ALIGN __packed;
+
+/**
+ * struct ipu3_uapi_awb_fr_config - AWB filter response config wrapper
+ *
+ * @config:	See &ipu3_uapi_awb_fr_config_s.
+ */
+struct ipu3_uapi_awb_fr_config {
+	struct ipu3_uapi_awb_fr_config_s config;
+} __packed;
+
+/**
+ * struct ipu3_uapi_4a_config - 4A config
+ *
+ * @awb_config: &ipu3_uapi_awb_config_s, default resolution 16x16
+ * @ae_grd_config: auto exposure statistics &ipu3_uapi_ae_grid_config
+ * @padding: paddings
+ * @af_config: auto focus config &ipu3_uapi_af_config_s
+ * @awb_fr_config: &ipu3_uapi_awb_fr_config_s, default resolution 16x16
+ */
+struct ipu3_uapi_4a_config {
+	IPU3_ALIGN struct ipu3_uapi_awb_config_s awb_config;
+	struct ipu3_uapi_ae_grid_config ae_grd_config;
+	__u8 padding[20];
+	struct ipu3_uapi_af_config_s af_config;
+	struct ipu3_uapi_awb_fr_config_s awb_fr_config;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bubble_info - Bubble info for host side debugging
+ *
+ * @num_of_stripes: A single frame is divided into several parts called stripes
+ *		    due to limitation on line buffer memory.
+ *		    The separation between the stripes is vertical. Each such
+ *		    stripe is processed as a single frame by the ISP pipe.
+ * @padding: padding bytes.
+ * @num_sets: number of sets.
+ * @padding1: padding bytes.
+ * @size_of_set: set size.
+ * @padding2: padding bytes.
+ * @bubble_size: is the amount of padding in the bubble expressed in “sets”.
+ * @padding3: padding bytes.
+ */
+struct ipu3_uapi_bubble_info {
+	IPU3_ALIGN __u32 num_of_stripes;
+	__u8 padding[28];
+	__u32 num_sets;
+	__u8 padding1[28];
+	__u32 size_of_set;
+	__u8 padding2[28];
+	__u32 bubble_size;
+	__u8 padding3[28];
+} __packed;
+
+/*
+ * struct ipu3_uapi_stats_3a_bubble_info_per_stripe
+ */
+struct ipu3_uapi_stats_3a_bubble_info_per_stripe {
+	struct ipu3_uapi_bubble_info awb[IPU3_UAPI_MAX_STRIPES];
+	struct ipu3_uapi_bubble_info af[IPU3_UAPI_MAX_STRIPES];
+	struct ipu3_uapi_bubble_info awb_fr[IPU3_UAPI_MAX_STRIPES];
+} __packed;
+
+/**
+ * struct ipu3_uapi_ff_status - Enable bits for each 3A fixed function
+ *
+ * @awb_en: auto white balance enable
+ * @padding: padding config
+ * @ae_en: auto exposure enable
+ * @padding1: padding config
+ * @af_en: auto focus enable
+ * @padding2: padding config
+ * @awb_fr_en: awb filter response enable bit
+ * @padding3: padding config
+ */
+struct ipu3_uapi_ff_status {
+	IPU3_ALIGN __u32 awb_en;
+	__u8 padding[28];
+	__u32 ae_en;
+	__u8 padding1[28];
+	__u32 af_en;
+	__u8 padding2[28];
+	__u32 awb_fr_en;
+	__u8 padding3[28];
+} __packed;
+
+/**
+ * struct ipu3_uapi_stats_3a - 3A statistics
+ *
+ * @awb_raw_buffer: auto white balance meta data &ipu3_uapi_awb_raw_buffer
+ * @ae_raw_buffer: auto exposure raw data &ipu3_uapi_ae_raw_buffer_aligned
+ * @af_raw_buffer: &ipu3_uapi_af_raw_buffer for auto focus meta data
+ * @awb_fr_raw_buffer: value as specified by &ipu3_uapi_awb_fr_raw_buffer
+ * @stats_4a_config: 4a statistics config as defined by &ipu3_uapi_4a_config.
+ * @ae_join_buffers: 1 to use ae_raw_buffer.
+ * @padding: padding config
+ * @stats_3a_bubble_per_stripe: a &ipu3_uapi_stats_3a_bubble_info_per_stripe
+ * @stats_3a_status: 3a statistics status set in &ipu3_uapi_ff_status
+ */
+struct ipu3_uapi_stats_3a {
+	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
+	struct ipu3_uapi_ae_raw_buffer_aligned
+			ae_raw_buffer[IPU3_UAPI_MAX_STRIPES];
+	struct ipu3_uapi_af_raw_buffer af_raw_buffer;
+	struct ipu3_uapi_awb_fr_raw_buffer awb_fr_raw_buffer;
+	struct ipu3_uapi_4a_config stats_4a_config;
+	__u32 ae_join_buffers;
+	__u8 padding[28];
+	struct ipu3_uapi_stats_3a_bubble_info_per_stripe
+			stats_3a_bubble_per_stripe;
+	struct ipu3_uapi_ff_status stats_3a_status;
+} __packed;
+
+/******************* ipu3_uapi_acc_param *******************/
+
+#define IPU3_UAPI_ISP_VEC_ELEMS				64
+#define IPU3_UAPI_ISP_TNR3_VMEM_LEN			9
+
+#define IPU3_UAPI_BNR_LUT_SIZE				32
+
+/* number of elements in gamma correction LUT */
+#define IPU3_UAPI_GAMMA_CORR_LUT_ENTRIES		256
+
+/* largest grid is 73x56, for grid_height_per_slice of 2, 73x2 = 146 */
+#define IPU3_UAPI_SHD_MAX_CELLS_PER_SET			146
+#define IPU3_UAPI_SHD_MAX_CFG_SETS			28
+/* Normalization shift aka nf */
+#define IPU3_UAPI_SHD_BLGR_NF_SHIFT			13
+#define IPU3_UAPI_SHD_BLGR_NF_MASK			0x7
+
+#define IPU3_UAPI_YUVP2_TCC_MACC_TABLE_ELEMENTS		16
+#define IPU3_UAPI_YUVP2_TCC_INV_Y_LUT_ELEMENTS		14
+#define IPU3_UAPI_YUVP2_TCC_GAIN_PCWL_LUT_ELEMENTS	258
+#define IPU3_UAPI_YUVP2_TCC_R_SQR_LUT_ELEMENTS		24
+
+#define IPU3_UAPI_ANR_LUT_SIZE				26
+#define IPU3_UAPI_ANR_PYRAMID_SIZE			22
+#define IPU3_UAPI_ANR_MAX_XRESET			(BIT(12) - 1)
+
+#define IPU3_UAPI_LIN_LUT_SIZE				64
+
+/* Bayer Noise Reduction related structs */
+
+/**
+ * struct ipu3_uapi_bnr_static_config_wb_gains_config - White balance gains
+ *
+ * @gr:	white balance gain for Gr channel.
+ * @r:	white balance gain for R channel.
+ * @b:	white balance gain for B channel.
+ * @gb:	white balance gain for Gb channel.
+ *
+ * Precision u3.13, range [0,8). White balance correction is done by applying
+ * a multiplicative gain to each color channels prior to BNR.
+ */
+struct ipu3_uapi_bnr_static_config_wb_gains_config {
+	__u16 gr;
+	__u16 r;
+	__u16 b;
+	__u16 gb;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_wb_gains_thr_config - Threshold config
+ *
+ * @gr:	white balance threshold gain for Gr channel.
+ * @r:	white balance threshold gain for R channel.
+ * @b:	white balance threshold gain for B channel.
+ * @gb:	white balance threshold gain for Gb channel.
+ *
+ * Defines the threshold that specifies how different a defect pixel can be from
+ * its neighbors.(used by dynamic defect pixel correction sub block)
+ * Precision u4.4 range [0,8).
+ */
+struct ipu3_uapi_bnr_static_config_wb_gains_thr_config {
+	__u8 gr;
+	__u8 r;
+	__u8 b;
+	__u8 gb;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_thr_coeffs_config - Noise model
+ *				coefficients that controls noise threshold
+ *
+ * @cf:	Free coefficient for threshold calculation, range [0..8191], default 0.
+ * @__reserved0:	reserved
+ * @cg:	Gain coefficient for threshold calculation, [0..31], default 8.
+ * @ci:	Intensity coefficient for threshold calculation. u3.2, range [0..7.75]
+ *	default 6.
+ * @__reserved1:	reserved
+ * @r_nf:	Normalization shift value for r^2 calculation, range [12 .. 20]
+ *		where r is a radius of pixel [row, col] from centor of sensor.
+ *		default 14.
+ *
+ * Threshold used to distinguish between noise and details.
+ */
+struct ipu3_uapi_bnr_static_config_thr_coeffs_config {
+	__u32 cf:13;
+	__u32 __reserved0:3;
+	__u32 cg:5;
+	__u32 ci:5;
+	__u32 __reserved1:1;
+	__u32 r_nf:5;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config - Shading config
+ *
+ * @gr:	Coefficient defines lens shading gain approximation for gr channel
+ * @r:	Coefficient defines lens shading gain approximation for r channel
+ * @b:	Coefficient defines lens shading gain approximation for b channel
+ * @gb:	Coefficient defines lens shading gain approximation for gb channel
+ *
+ * Parameters for noise model (NM) adaptation of BNR due to shading correction.
+ * All above have precision of u3.3, default to 0.
+ */
+struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config {
+	__u8 gr;
+	__u8 r;
+	__u8 b;
+	__u8 gb;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_opt_center_config - Optical center config
+ *
+ * @x_reset:	Reset value of X (col start - X center). Precision s12.0.
+ * @__reserved0:	reserved
+ * @y_reset:	Reset value of Y (row start - Y center). Precision s12.0.
+ * @__reserved2:	reserved
+ *
+ * Distance from corner to optical center for NM adaptation due to shading
+ * correction (should be calculated based on shading tables)
+ */
+struct ipu3_uapi_bnr_static_config_opt_center_config {
+	__s32 x_reset:13;
+	__u32 __reserved0:3;
+	__s32 y_reset:13;
+	__u32 __reserved2:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_lut_config - BNR square root lookup table
+ *
+ * @values: pre-calculated values of square root function.
+ *
+ * LUT implementation of square root operation.
+ */
+struct ipu3_uapi_bnr_static_config_lut_config {
+	__u8 values[IPU3_UAPI_BNR_LUT_SIZE];
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_bp_ctrl_config - Detect bad pixels (bp)
+ *
+ * @bp_thr_gain:	Defines the threshold that specifies how different a
+ *			defect pixel can be from its neighbors. Threshold is
+ *			dependent on de-noise threshold calculated by algorithm.
+ *			Range [4..31], default 4.
+ * @__reserved0:	reserved
+ * @defect_mode:	Mode of addressed defect pixels,
+ *			0 – single defect pixel is expected,
+ *			1 - 2 adjacent defect pixels are expected, default 1.
+ * @bp_gain:	Defines how 2nd derivation that passes through a defect pixel
+ *		is different from 2nd derivations that pass through
+ *		neighbor pixels. u4.2, range [0-256), default 8.
+ * @__reserved1:	reserved
+ * @w0_coeff:	Blending coefficient of defect pixel correction.
+ *		Precision u4, range [0..8], default 8.
+ * @__reserved2:	reserved
+ * @w1_coeff:	Enable influence of incorrect defect pixel correction to be
+ *		avoided. Precision u4, range [1..8], default 8.
+ * @__reserved3:	reserved
+ */
+struct ipu3_uapi_bnr_static_config_bp_ctrl_config {
+	__u32 bp_thr_gain:5;
+	__u32 __reserved0:2;
+	__u32 defect_mode:1;
+	__u32 bp_gain:6;
+	__u32 __reserved1:18;
+	__u32 w0_coeff:4;
+	__u32 __reserved2:4;
+	__u32 w1_coeff:4;
+	__u32 __reserved3:20;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config - Denoising config
+ *
+ * @alpha:	Weight of central element of smoothing filter.
+ * @beta:	Weight of peripheral elements of smoothing filter, default 4.
+ * @gamma:	Weight of diagonal elements of smoothing filter, default 4.
+ *
+ * beta and gamma parameter define the strength of the noise removal filter.
+ * All above has precision u0.4, range [0..0xF].
+ *
+ * @__reserved0:	reserved
+ * @max_inf:	Maximum increase of peripheral or diagonal element influence
+ *		relative to the pre-defined value range: [0x5..0xA]
+ * @__reserved1:	reserved
+ * @gd_enable:	Green disparity enable control, 0 - disable, 1 - enable.
+ * @bpc_enable:	Bad pixel correction enable control, 0 - disable, 1 - enable.
+ * @bnr_enable:	Bayer noise removal enable control, 0 - disable, 1 - enable.
+ * @ff_enable:	Fixed function enable, 0 - disable, 1 - enable.
+ * @__reserved2:	reserved
+ */
+struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config {
+	__u32 alpha:4;
+	__u32 beta:4;
+	__u32 gamma:4;
+	__u32 __reserved0:4;
+	__u32 max_inf:4;
+	__u32 __reserved1:7;
+	__u32 gd_enable:1;
+	__u32 bpc_enable:1;
+	__u32 bnr_enable:1;
+	__u32 ff_enable:1;
+	__u32 __reserved2:1;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_opt_center_sqr_config - BNR optical square
+ *
+ * @x_sqr_reset: Reset value of X^2.
+ * @y_sqr_reset: Reset value of Y^2.
+ *
+ * Please note:
+ *
+ *    #. X and Y ref to
+ *       &ipu3_uapi_bnr_static_config_opt_center_config
+ *    #. Both structs are used in threshold formula to calculate r^2, where r
+ *       is a radius of pixel [row, col] from centor of sensor.
+ */
+struct ipu3_uapi_bnr_static_config_opt_center_sqr_config {
+	__u32 x_sqr_reset;
+	__u32 y_sqr_reset;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config - BNR static config
+ *
+ * @wb_gains:	white balance gains &ipu3_uapi_bnr_static_config_wb_gains_config
+ * @wb_gains_thr:	white balance gains threshold as defined by
+ *			&ipu3_uapi_bnr_static_config_wb_gains_thr_config
+ * @thr_coeffs:	coefficients of threshold
+ *		&ipu3_uapi_bnr_static_config_thr_coeffs_config
+ * @thr_ctrl_shd:	control of shading threshold
+ *			&ipu3_uapi_bnr_static_config_thr_ctrl_shd_config
+ * @opt_center:	optical center &ipu3_uapi_bnr_static_config_opt_center_config
+ *
+ * Above parameters and opt_center_sqr are used for white balance and shading.
+ *
+ * @lut:	lookup table &ipu3_uapi_bnr_static_config_lut_config
+ * @bp_ctrl:	detect and remove bad pixels as defined in struct
+ *		&ipu3_uapi_bnr_static_config_bp_ctrl_config
+ * @dn_detect_ctrl:	detect and remove noise.
+ *			&ipu3_uapi_bnr_static_config_dn_detect_ctrl_config
+ * @column_size:	The number of pixels in column.
+ * @opt_center_sqr:	Reset value of r^2 to optical center, see
+ *			&ipu3_uapi_bnr_static_config_opt_center_sqr_config.
+ */
+struct ipu3_uapi_bnr_static_config {
+	struct ipu3_uapi_bnr_static_config_wb_gains_config wb_gains;
+	struct ipu3_uapi_bnr_static_config_wb_gains_thr_config wb_gains_thr;
+	struct ipu3_uapi_bnr_static_config_thr_coeffs_config thr_coeffs;
+	struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config thr_ctrl_shd;
+	struct ipu3_uapi_bnr_static_config_opt_center_config opt_center;
+	struct ipu3_uapi_bnr_static_config_lut_config lut;
+	struct ipu3_uapi_bnr_static_config_bp_ctrl_config bp_ctrl;
+	struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config dn_detect_ctrl;
+	__u32 column_size;
+	struct ipu3_uapi_bnr_static_config_opt_center_sqr_config opt_center_sqr;
+} __packed;
+
+/**
+ * struct ipu3_uapi_bnr_static_config_green_disparity - Correct green disparity
+ *
+ * @gd_red:	Shading gain coeff for gr disparity level in bright red region.
+ *		Precision u0.6, default 4(0.0625).
+ * @__reserved0:	reserved
+ * @gd_green:	Shading gain coeff for gr disparity level in bright green
+ *		region. Precision u0.6, default 4(0.0625).
+ * @__reserved1:	reserved
+ * @gd_blue:	Shading gain coeff for gr disparity level in bright blue region.
+ *		Precision u0.6, default 4(0.0625).
+ * @__reserved2:	reserved
+ * @gd_black:	Maximal green disparity level in dark region (stronger disparity
+ *		assumed to be image detail). Precision u14, default 80.
+ * @__reserved3:	reserved
+ * @gd_shading:	Change maximal green disparity level according to square
+ *		distance from image center.
+ * @__reserved4:	reserved
+ * @gd_support:	Lower bound for the number of second green color pixels in
+ *		current pixel neighborhood with less than threshold difference
+ *		from it.
+ *
+ * The shading gain coeff of red, green, blue and black are used to calculate
+ * threshold given a pixel's color value and its coordinates in the image.
+ *
+ * @__reserved5:	reserved
+ * @gd_clip:	Turn green disparity clip on/off, [0,1], default 1.
+ * @gd_central_weight:	Central pixel weight in 9 pixels weighted sum.
+ */
+struct ipu3_uapi_bnr_static_config_green_disparity {
+	__u32 gd_red:6;
+	__u32 __reserved0:2;
+	__u32 gd_green:6;
+	__u32 __reserved1:2;
+	__u32 gd_blue:6;
+	__u32 __reserved2:10;
+	__u32 gd_black:14;
+	__u32 __reserved3:2;
+	__u32 gd_shading:7;
+	__u32 __reserved4:1;
+	__u32 gd_support:2;
+	__u32 __reserved5:1;
+	__u32 gd_clip:1;
+	__u32 gd_central_weight:4;
+} __packed;
+
+/**
+ * struct ipu3_uapi_dm_config - De-mosaic parameters
+ *
+ * @dm_en:	de-mosaic enable.
+ * @ch_ar_en:	Checker artifacts removal enable flag. Default 0.
+ * @fcc_en:	False color correction (FCC) enable flag. Default 0.
+ * @__reserved0:	reserved
+ * @frame_width:	do not care
+ * @gamma_sc:	Sharpening coefficient (coefficient of 2-d derivation of
+ *		complementary color in Hamilton-Adams interpolation).
+ *		u5, range [0-31], default 8.
+ * @__reserved1:	reserved
+ * @lc_ctrl:	Parameter that controls weights of Chroma Homogeneity metric
+ *		in calculation of final homogeneity metric.
+ *		u5, range [0-31], default 7.
+ * @__reserved2:	reserved
+ * @cr_param1:	First parameter that defines Checker artifact removal
+ *		feature gain.Precision u5, range [0-31], default 8.
+ * @__reserved3:	reserved
+ * @cr_param2:	Second parameter that defines Checker artifact removal
+ *		feature gain. Precision u5, range [0-31], default 8.
+ * @__reserved4:	reserved
+ * @coring_param:	Defines power of false color correction operation.
+ *			low for preserving edge colors, high for preserving gray
+ *			edge artifacts. u1.4, range [0-1.9375], default 4(0.25).
+ * @__reserved5:	reserved
+ *
+ * The demosaic fixed function block is responsible to covert Bayer(mosaiced)
+ * images into color images based on demosaicing algorithm.
+ */
+struct ipu3_uapi_dm_config {
+	/* DWORD0 */
+	__u32 dm_en:1;
+	__u32 ch_ar_en:1;
+	__u32 fcc_en:1;
+	__u32 __reserved0:13;
+	__u32 frame_width:16;
+
+	/* DWORD1 */
+	__u32 gamma_sc:5;
+	__u32 __reserved1:3;
+	__u32 lc_ctrl:5;
+	__u32 __reserved2:3;
+	__u32 cr_param1:5;
+	__u32 __reserved3:3;
+	__u32 cr_param2:5;
+	__u32 __reserved4:3;
+
+	/* DWORD2 */
+	__u32 coring_param:5;
+	__u32 __reserved5:27;
+} __packed;
+
+/**
+ * struct ipu3_uapi_ccm_mat_config - Color correction matrix
+ *
+ * @coeff_m11: CCM 3x3 coefficient, range -65536, 65535
+ * @coeff_m12: CCM 3x3 coefficient, range -8192, 8191
+ * @coeff_m13: CCM 3x3 coefficient, range -32768, 32767
+ * @coeff_o_r: Bias 3x1 coefficient, range -8191, 8181
+ * @coeff_m21: CCM 3x3 coefficient, range -32767, 32767
+ * @coeff_m22: CCM 3x3 coefficient, range -8192, 8191
+ * @coeff_m23: CCM 3x3 coefficient, range -32768, 32767
+ * @coeff_o_g: Bias 3x1 coefficient, range -8191, 8181
+ * @coeff_m31: CCM 3x3 coefficient, range -32768, 32767
+ * @coeff_m32: CCM 3x3 coefficient, range -8192, 8191
+ * @coeff_m33: CCM 3x3 coefficient, range -32768, 32767
+ * @coeff_o_b: Bias 3x1 coefficient, range -8191, 8181
+ *
+ * Transform sensor specific color space to standard sRGB by applying 3x3 matrix
+ * and adding a bias vector O. The transformation is basically a rotation and
+ * translation in the 3-dimensional color spaces. Here are the defaults:
+ *
+ *	9775,	-2671,	1087,	0
+ *	-1071,	8303,	815,	0
+ *	-23,	-7887,	16103,	0
+ */
+struct ipu3_uapi_ccm_mat_config {
+	__s16 coeff_m11;
+	__s16 coeff_m12;
+	__s16 coeff_m13;
+	__s16 coeff_o_r;
+	__s16 coeff_m21;
+	__s16 coeff_m22;
+	__s16 coeff_m23;
+	__s16 coeff_o_g;
+	__s16 coeff_m31;
+	__s16 coeff_m32;
+	__s16 coeff_m33;
+	__s16 coeff_o_b;
+} __packed;
+
+/**
+ * struct ipu3_uapi_gamma_corr_ctrl - Gamma correction
+ *
+ * @enable: gamma correction enable.
+ * @__reserved: reserved
+ */
+struct ipu3_uapi_gamma_corr_ctrl {
+	__u32 enable:1;
+	__u32 __reserved:31;
+} __packed;
+
+/**
+ * struct ipu3_uapi_gamma_corr_lut - Per-pixel tone mapping implemented as LUT.
+ *
+ * @lut:	256 tabulated values of the gamma function. LUT[1].. LUT[256]
+ *		format u13.0, range (0, 8191).
+ *
+ * The tone mapping operation is done by a Piece wise linear graph
+ * that is implemented as a lookup table(LUT). The pixel component input
+ * intensity is the X-axis of the graph which is the table entry.
+ */
+struct ipu3_uapi_gamma_corr_lut {
+	__u16 lut[IPU3_UAPI_GAMMA_CORR_LUT_ENTRIES];
+} __packed;
+
+/**
+ * struct ipu3_uapi_gamma_config - Gamma config
+ *
+ * @gc_ctrl: control of gamma correction &ipu3_uapi_gamma_corr_ctrl
+ * @gc_lut: lookup table of gamma correction &ipu3_uapi_gamma_corr_lut
+ */
+struct ipu3_uapi_gamma_config {
+	IPU3_ALIGN struct ipu3_uapi_gamma_corr_ctrl gc_ctrl;
+	IPU3_ALIGN struct ipu3_uapi_gamma_corr_lut gc_lut;
+} __packed;
+
+/**
+ * struct ipu3_uapi_csc_mat_config - Color space conversion matrix config
+ *
+ * @coeff_c11:	Conversion matrix value, format s0.14, range (-1,1), default 1.
+ * @coeff_c12:	Conversion matrix value, format s0.14, range (-1,1), default 0.
+ * @coeff_c13:	Conversion matrix value, format s0.14, range (-1,1), default 0.
+ * @coeff_b1:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
+ * @coeff_c21:	Conversion matrix value, format s0.14, range (-1,1), default 0.
+ * @coeff_c22:	Conversion matrix value, format s0.14, range (-1,1), default 1.
+ * @coeff_c23:	Conversion matrix value, format s0.14, range (-1,1), default 0.
+ * @coeff_b2:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
+ * @coeff_c31:	Conversion matrix value, format s0.14, range (-1,1), default 0.
+ * @coeff_c32:	Conversion matrix value, format s0.14, range (-1,1), default 0.
+ * @coeff_c33:	Conversion matrix value, format s0.14, range (-1,1), default 1.
+ * @coeff_b3:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
+ *
+ * To transform each pixel from RGB to YUV (Y - brightness/luminance,
+ * UV -chroma) by applying the pixel's values by a 3x3 matrix and adding an
+ * optional bias 3x1 vector.
+ */
+struct ipu3_uapi_csc_mat_config {
+	__s16 coeff_c11;
+	__s16 coeff_c12;
+	__s16 coeff_c13;
+	__s16 coeff_b1;
+	__s16 coeff_c21;
+	__s16 coeff_c22;
+	__s16 coeff_c23;
+	__s16 coeff_b2;
+	__s16 coeff_c31;
+	__s16 coeff_c32;
+	__s16 coeff_c33;
+	__s16 coeff_b3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_cds_params - Chroma down-scaling
+ *
+ * @ds_c00:	range 0, 3
+ * @ds_c01:	range 0, 3
+ * @ds_c02:	range 0, 3
+ * @ds_c03:	range 0, 3
+ * @ds_c10:	range 0, 3
+ * @ds_c11:	range 0, 3
+ * @ds_c12:	range 0, 3
+ * @ds_c13:	range 0, 3
+ *
+ * Above are 4x2 filter has the following defaults:
+ *	1, 3, 3, 1,
+ *	1, 3, 3, 1,
+ *
+ * @ds_nf:	Normalization factor for Chroma output downscaling filter,
+ *		range 0,4, default 2.
+ * @__reserved0:	reserved
+ * @csc_en:	Color space conversion enable
+ * @uv_bin_output:	0: output YUV 4.2.0, 1: output YUV 4.2.2(default).
+ * @__reserved1:	reserved
+ */
+struct ipu3_uapi_cds_params {
+	__u32 ds_c00:2;
+	__u32 ds_c01:2;
+	__u32 ds_c02:2;
+	__u32 ds_c03:2;
+	__u32 ds_c10:2;
+	__u32 ds_c11:2;
+	__u32 ds_c12:2;
+	__u32 ds_c13:2;
+	__u32 ds_nf:5;
+	__u32 __reserved0:3;
+	__u32 csc_en:1;
+	__u32 uv_bin_output:1;
+	__u32 __reserved1:6;
+} __packed;
+
+/**
+ * struct ipu3_uapi_shd_grid_config - Bayer shading(darkening) correction
+ *
+ * @width:	Grid horizontal dimensions, u8, [8, 128], default 73
+ * @height:	Grid vertical dimensions, u8, [8, 128], default 56
+ * @block_width_log2:	Log2 of the width of the grid cell in pixel count
+ *			u4, [0, 15], default value 5.
+ * @__reserved0:	reserved
+ * @block_height_log2:	Log2 of the height of the grid cell in pixel count
+ *			u4, [0, 15], default value 6.
+ * @__reserved1:	reserved
+ * @grid_height_per_slice:	SHD_MAX_CELLS_PER_SET/width.
+ *				(with SHD_MAX_CELLS_PER_SET = 146).
+ * @x_start:	X value of top left corner of sensor relative to ROI
+ *		u12, [-4096 0]. default 0, only negative values.
+ * @y_start:	Y value of top left corner of sensor relative to ROI
+ *		u12, [-4096 0]. default 0, only negative values.
+ */
+struct ipu3_uapi_shd_grid_config {
+	/* reg 0 */
+	__u8 width;
+	__u8 height;
+	__u8 block_width_log2:3;
+	__u8 __reserved0:1;
+	__u8 block_height_log2:3;
+	__u8 __reserved1:1;
+	__u8 grid_height_per_slice;
+	/* reg 1 */
+	__s16 x_start;
+	__s16 y_start;
+} __packed;
+
+/**
+ * struct ipu3_uapi_shd_general_config - Shading general config
+ *
+ * @init_set_vrt_offst_ul: set vertical offset,
+ *			y_start >> block_height_log2 % grid_height_per_slice.
+ * @shd_enable: shading enable.
+ * @gain_factor: Gain factor. Shift calculated anti shading value. Precision u2.
+ *		0x0 - gain factor [1..5), means no shift interpolated value.
+ *		0x1 - gain factor [1..9), means shift interpolated by 1.
+ *		0x2 - gain factor [1..17), means shift interpolated by 2.
+ * @__reserved: reserved
+ *
+ * Correction is performed by multiplying a gain factor for each of the 4 Bayer
+ * channels as a function of the pixel location in the sensor.
+ */
+struct ipu3_uapi_shd_general_config {
+	__u32 init_set_vrt_offst_ul:8;
+	__u32 shd_enable:1;
+	/* aka 'gf' */
+	__u32 gain_factor:2;
+	__u32 __reserved:21;
+} __packed;
+
+/**
+ * struct ipu3_uapi_shd_black_level_config - Black level correction
+ *
+ * @bl_r:	Bios values for green red. s11 range [-2048, 2047].
+ * @bl_gr:	Bios values for green blue. s11 range [-2048, 2047].
+ * @bl_gb:	Bios values for red. s11 range [-2048, 2047].
+ * @bl_b:	Bios values for blue. s11 range [-2048, 2047].
+ */
+struct ipu3_uapi_shd_black_level_config {
+	__s16 bl_r;
+	__s16 bl_gr;
+	__s16 bl_gb;
+	__s16 bl_b;
+} __packed;
+
+/**
+ * struct ipu3_uapi_shd_config_static - Shading config static
+ *
+ * @grid:	shading grid config &ipu3_uapi_shd_grid_config
+ * @general:	shading general config &ipu3_uapi_shd_general_config
+ * @black_level:	black level config for shading correction as defined by
+ *			&ipu3_uapi_shd_black_level_config
+ */
+struct ipu3_uapi_shd_config_static {
+	struct ipu3_uapi_shd_grid_config grid;
+	struct ipu3_uapi_shd_general_config general;
+	struct ipu3_uapi_shd_black_level_config black_level;
+} __packed;
+
+/**
+ * struct ipu3_uapi_shd_lut - Shading gain factor lookup table.
+ *
+ * @sets: array
+ * @sets.r_and_gr: Red and GreenR Lookup table.
+ * @sets.r_and_gr.r: Red shading factor.
+ * @sets.r_and_gr.gr: GreenR shading factor.
+ * @sets.__reserved1: reserved
+ * @sets.gb_and_b: GreenB and Blue Lookup table.
+ * @sets.gb_and_b.gb: GreenB shading factor.
+ * @sets.gb_and_b.b: Blue shading factor.
+ * @sets.__reserved2: reserved
+ *
+ * Map to shading correction LUT register set.
+ */
+struct ipu3_uapi_shd_lut {
+	struct {
+		struct {
+			__u16 r;
+			__u16 gr;
+		} r_and_gr[IPU3_UAPI_SHD_MAX_CELLS_PER_SET];
+		__u8 __reserved1[24];
+		struct {
+			__u16 gb;
+			__u16 b;
+		} gb_and_b[IPU3_UAPI_SHD_MAX_CELLS_PER_SET];
+		__u8 __reserved2[24];
+	} sets[IPU3_UAPI_SHD_MAX_CFG_SETS];
+} __packed;
+
+/**
+ * struct ipu3_uapi_shd_config - Shading config
+ *
+ * @shd:	shading static config, see &ipu3_uapi_shd_config_static
+ * @shd_lut:	shading lookup table &ipu3_uapi_shd_lut
+ */
+struct ipu3_uapi_shd_config {
+	IPU3_ALIGN struct ipu3_uapi_shd_config_static shd;
+	IPU3_ALIGN struct ipu3_uapi_shd_lut shd_lut;
+} __packed;
+
+/* Image Enhancement Filter directed */
+
+/**
+ * struct ipu3_uapi_iefd_cux2 - IEFd Config Unit 2 parameters
+ *
+ * @x0:		X0 point of Config Unit, u9.0, default 0.
+ * @x1:		X1 point of Config Unit, u9.0, default 0.
+ * @a01:	Slope A of Config Unit, s4.4, default 0.
+ * @b01:	Always 0.
+ *
+ * Calculate weight for blending directed and non-directed denoise elements
+ *
+ * Note:
+ * Each instance of Config Unit needs X coordinate of n points and
+ * slope A factor between points calculated by driver based on calibration
+ * parameters.
+ */
+struct ipu3_uapi_iefd_cux2 {
+	__u32 x0:9;
+	__u32 x1:9;
+	__u32 a01:9;
+	__u32 b01:5;	/* NOTE: hardcoded to zero */
+} __packed;
+
+/**
+ * struct ipu3_uapi_iefd_cux6_ed - Calculate power of non-directed sharpening
+ *				   element, Config Unit 6 for edge detail (ED).
+ *
+ * @x0:	X coordinate of point 0, u9.0, default 0.
+ * @x1:	X coordinate of point 1, u9.0, default 0.
+ * @x2:	X coordinate of point 2, u9.0, default 0.
+ * @__reserved0:	reserved
+ * @x3:	X coordinate of point 3, u9.0, default 0.
+ * @x4:	X coordinate of point 4, u9.0, default 0.
+ * @x5:	X coordinate of point 5, u9.0, default 0.
+ * @__reserved1:	reserved
+ * @a01:	slope A points 01, s4.4, default 0.
+ * @a12:	slope A points 12, s4.4, default 0.
+ * @a23:	slope A points 23, s4.4, default 0.
+ * @__reserved2:	reserved
+ * @a34:	slope A points 34, s4.4, default 0.
+ * @a45:	slope A points 45, s4.4, default 0.
+ * @__reserved3:	reserved
+ * @b01:	slope B points 01, s4.4, default 0.
+ * @b12:	slope B points 12, s4.4, default 0.
+ * @b23:	slope B points 23, s4.4, default 0.
+ * @__reserved4:	reserved
+ * @b34:	slope B points 34, s4.4, default 0.
+ * @b45:	slope B points 45, s4.4, default 0.
+ * @__reserved5:	reserved
+ */
+struct ipu3_uapi_iefd_cux6_ed {
+	__u32 x0:9;
+	__u32 x1:9;
+	__u32 x2:9;
+	__u32 __reserved0:5;
+
+	__u32 x3:9;
+	__u32 x4:9;
+	__u32 x5:9;
+	__u32 __reserved1:5;
+
+	__u32 a01:9;
+	__u32 a12:9;
+	__u32 a23:9;
+	__u32 __reserved2:5;
+
+	__u32 a34:9;
+	__u32 a45:9;
+	__u32 __reserved3:14;
+
+	__u32 b01:9;
+	__u32 b12:9;
+	__u32 b23:9;
+	__u32 __reserved4:5;
+
+	__u32 b34:9;
+	__u32 b45:9;
+	__u32 __reserved5:14;
+} __packed;
+
+/**
+ * struct ipu3_uapi_iefd_cux2_1 - Calculate power of non-directed denoise
+ *				  element apply.
+ * @x0: X0 point of Config Unit, u9.0, default 0.
+ * @x1: X1 point of Config Unit, u9.0, default 0.
+ * @a01: Slope A of Config Unit, s4.4, default 0.
+ * @__reserved1: reserved
+ * @b01: offset B0 of Config Unit, u7.0, default 0.
+ * @__reserved2: reserved
+ */
+struct ipu3_uapi_iefd_cux2_1 {
+	__u32 x0:9;
+	__u32 x1:9;
+	__u32 a01:9;
+	__u32 __reserved1:5;
+
+	__u32 b01:8;
+	__u32 __reserved2:24;
+} __packed;
+
+/**
+ * struct ipu3_uapi_iefd_cux4 - Calculate power of non-directed sharpening
+ *				element.
+ *
+ * @x0:	X0 point of Config Unit, u9.0, default 0.
+ * @x1:	X1 point of Config Unit, u9.0, default 0.
+ * @x2:	X2 point of Config Unit, u9.0, default 0.
+ * @__reserved0:	reserved
+ * @x3:	X3 point of Config Unit, u9.0, default 0.
+ * @a01:	Slope A0 of Config Unit, s4.4, default 0.
+ * @a12:	Slope A1 of Config Unit, s4.4, default 0.
+ * @__reserved1:	reserved
+ * @a23:	Slope A2 of Config Unit, s4.4, default 0.
+ * @b01:	Offset B0 of Config Unit, s7.0, default 0.
+ * @b12:	Offset B1 of Config Unit, s7.0, default 0.
+ * @__reserved2:	reserved
+ * @b23:	Offset B2 of Config Unit, s7.0, default 0.
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_iefd_cux4 {
+	__u32 x0:9;
+	__u32 x1:9;
+	__u32 x2:9;
+	__u32 __reserved0:5;
+
+	__u32 x3:9;
+	__u32 a01:9;
+	__u32 a12:9;
+	__u32 __reserved1:5;
+
+	__u32 a23:9;
+	__u32 b01:8;
+	__u32 b12:8;
+	__u32 __reserved2:7;
+
+	__u32 b23:8;
+	__u32 __reserved3:24;
+} __packed;
+
+/**
+ * struct ipu3_uapi_iefd_cux6_rad - Radial Config Unit (CU)
+ *
+ * @x0:	x0 points of Config Unit radial, u8.0
+ * @x1:	x1 points of Config Unit radial, u8.0
+ * @x2:	x2 points of Config Unit radial, u8.0
+ * @x3:	x3 points of Config Unit radial, u8.0
+ * @x4:	x4 points of Config Unit radial, u8.0
+ * @x5:	x5 points of Config Unit radial, u8.0
+ * @__reserved1: reserved
+ * @a01:	Slope A of Config Unit radial, s7.8
+ * @a12:	Slope A of Config Unit radial, s7.8
+ * @a23:	Slope A of Config Unit radial, s7.8
+ * @a34:	Slope A of Config Unit radial, s7.8
+ * @a45:	Slope A of Config Unit radial, s7.8
+ * @__reserved2: reserved
+ * @b01:	Slope B of Config Unit radial, s9.0
+ * @b12:	Slope B of Config Unit radial, s9.0
+ * @b23:	Slope B of Config Unit radial, s9.0
+ * @__reserved4: reserved
+ * @b34:	Slope B of Config Unit radial, s9.0
+ * @b45:	Slope B of Config Unit radial, s9.0
+ * @__reserved5: reserved
+ */
+struct ipu3_uapi_iefd_cux6_rad {
+	__u32 x0:8;
+	__u32 x1:8;
+	__u32 x2:8;
+	__u32 x3:8;
+
+	__u32 x4:8;
+	__u32 x5:8;
+	__u32 __reserved1:16;
+
+	__u32 a01:16;
+	__u32 a12:16;
+
+	__u32 a23:16;
+	__u32 a34:16;
+
+	__u32 a45:16;
+	__u32 __reserved2:16;
+
+	__u32 b01:10;
+	__u32 b12:10;
+	__u32 b23:10;
+	__u32 __reserved4:2;
+
+	__u32 b34:10;
+	__u32 b45:10;
+	__u32 __reserved5:12;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_cfg_units - IEFd Config Units parameters
+ *
+ * @cu_1: calculate weight for blending directed and
+ *	  non-directed denoise elements. See &ipu3_uapi_iefd_cux2
+ * @cu_ed: calculate power of non-directed sharpening element, see
+ *	   &ipu3_uapi_iefd_cux6_ed
+ * @cu_3: calculate weight for blending directed and
+ *	  non-directed denoise elements. A &ipu3_uapi_iefd_cux2
+ * @cu_5: calculate power of non-directed denoise element apply, use
+ *	  &ipu3_uapi_iefd_cux2_1
+ * @cu_6: calculate power of non-directed sharpening element. See
+ *	  &ipu3_uapi_iefd_cux4
+ * @cu_7: calculate weight for blending directed and
+ *	  non-directed denoise elements. Use &ipu3_uapi_iefd_cux2
+ * @cu_unsharp: Config Unit of unsharp &ipu3_uapi_iefd_cux4
+ * @cu_radial: Config Unit of radial &ipu3_uapi_iefd_cux6_rad
+ * @cu_vssnlm: Config Unit of vssnlm &ipu3_uapi_iefd_cux2
+ */
+struct ipu3_uapi_yuvp1_iefd_cfg_units {
+	struct ipu3_uapi_iefd_cux2 cu_1;
+	struct ipu3_uapi_iefd_cux6_ed cu_ed;
+	struct ipu3_uapi_iefd_cux2 cu_3;
+	struct ipu3_uapi_iefd_cux2_1 cu_5;
+	struct ipu3_uapi_iefd_cux4 cu_6;
+	struct ipu3_uapi_iefd_cux2 cu_7;
+	struct ipu3_uapi_iefd_cux4 cu_unsharp;
+	struct ipu3_uapi_iefd_cux6_rad cu_radial;
+	struct ipu3_uapi_iefd_cux2 cu_vssnlm;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_config_s - IEFd config
+ *
+ * @horver_diag_coeff: Gradiant compensation, coefficient that compensates for
+ *		       different distance for vertical / horizontal and diagonal
+ *		       * gradient calculation (~1/sqrt(2)).
+ * @__reserved0: reserved
+ * @clamp_stitch: Slope to stitch between clamped and unclamped edge values
+ * @__reserved1: reserved
+ * @direct_metric_update: Update coeff for direction metric
+ * @__reserved2: reserved
+ * @ed_horver_diag_coeff: Radial Coefficient that compensates for
+ *			  different distance for vertical/horizontal and
+ *			  diagonal gradient calculation (~1/sqrt(2))
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_yuvp1_iefd_config_s {
+	__u32 horver_diag_coeff:7;
+	__u32 __reserved0:1;
+	__u32 clamp_stitch:6;
+	__u32 __reserved1:2;
+	__u32 direct_metric_update:5;
+	__u32 __reserved2:3;
+	__u32 ed_horver_diag_coeff:7;
+	__u32 __reserved3:1;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_control - IEFd control
+ *
+ * @iefd_en:	Enable IEFd
+ * @denoise_en:	Enable denoise
+ * @direct_smooth_en:	Enable directional smooth
+ * @rad_en:	Enable radial update
+ * @vssnlm_en:	Enable VSSNLM output filter
+ * @__reserved:	reserved
+ */
+struct ipu3_uapi_yuvp1_iefd_control {
+	__u32 iefd_en:1;
+	__u32 denoise_en:1;
+	__u32 direct_smooth_en:1;
+	__u32 rad_en:1;
+	__u32 vssnlm_en:1;
+	__u32 __reserved:27;
+} __packed;
+
+/**
+ * struct ipu3_uapi_sharp_cfg - Sharpening config
+ *
+ * @nega_lmt_txt: Sharpening limit for negative overshoots for texture.
+ * @__reserved0: reserved
+ * @posi_lmt_txt: Sharpening limit for positive overshoots for texture.
+ * @__reserved1: reserved
+ * @nega_lmt_dir: Sharpening limit for negative overshoots for direction (edge).
+ * @__reserved2: reserved
+ * @posi_lmt_dir: Sharpening limit for positive overshoots for direction (edge).
+ * @__reserved3: reserved
+ *
+ * Fixed point type u13.0, range [0, 8191].
+ */
+struct ipu3_uapi_sharp_cfg {
+	__u32 nega_lmt_txt:13;
+	__u32 __reserved0:19;
+	__u32 posi_lmt_txt:13;
+	__u32 __reserved1:19;
+	__u32 nega_lmt_dir:13;
+	__u32 __reserved2:19;
+	__u32 posi_lmt_dir:13;
+	__u32 __reserved3:19;
+} __packed;
+
+/**
+ * struct struct ipu3_uapi_far_w - Sharpening config for far sub-group
+ *
+ * @dir_shrp:	Weight of wide direct sharpening, u1.6, range 0-64, default 64.
+ * @__reserved0:	reserved
+ * @dir_dns:	Weight of wide direct denoising, u1.6, range 0-64, default 0.
+ * @__reserved1:	reserved
+ * @ndir_dns_powr:	Power of non-direct denoising,
+ *			Precision u1.6, range 0-64, default 64.
+ * @__reserved2:	reserved
+ */
+struct ipu3_uapi_far_w {
+	__u32 dir_shrp:7;
+	__u32 __reserved0:1;
+	__u32 dir_dns:7;
+	__u32 __reserved1:1;
+	__u32 ndir_dns_powr:7;
+	__u32 __reserved2:9;
+} __packed;
+
+/**
+ * struct struct ipu3_uapi_unsharp_cfg - Unsharp config
+ *
+ * @unsharp_weight: Unsharp mask blending weight.
+ *		    u1.6, range 0-64, default 16.
+ *		    0 – disabled, 64 - use only unsharp.
+ * @__reserved0: reserved
+ * @unsharp_amount: Unsharp mask amount, u4.5, range 0-511, default 0.
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_unsharp_cfg {
+	__u32 unsharp_weight:7;
+	__u32 __reserved0:1;
+	__u32 unsharp_amount:9;
+	__u32 __reserved1:15;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_shrp_cfg - IEFd sharpness config
+ *
+ * @cfg: sharpness config &ipu3_uapi_sharp_cfg
+ * @far_w: wide range config, value as specified by &ipu3_uapi_far_w:
+ *	The 5x5 environment is separated into 2 sub-groups, the 3x3 nearest
+ *	neighbors (8 pixels called Near), and the second order neighborhood
+ *	around them (16 pixels called Far).
+ * @unshrp_cfg: unsharpness config. &ipu3_uapi_unsharp_cfg
+ */
+struct ipu3_uapi_yuvp1_iefd_shrp_cfg {
+	struct ipu3_uapi_sharp_cfg cfg;
+	struct ipu3_uapi_far_w far_w;
+	struct ipu3_uapi_unsharp_cfg unshrp_cfg;
+} __packed;
+
+/**
+ * struct ipu3_uapi_unsharp_coef0 - Unsharp mask coefficients
+ *
+ * @c00: Coeff11, s0.8, range -255 - 255, default 1.
+ * @c01: Coeff12, s0.8, range -255 - 255, default 5.
+ * @c02: Coeff13, s0.8, range -255 - 255, default 9.
+ * @__reserved: reserved
+ *
+ * Configurable registers for common sharpening support.
+ */
+struct ipu3_uapi_unsharp_coef0 {
+	__u32 c00:9;
+	__u32 c01:9;
+	__u32 c02:9;
+	__u32 __reserved:5;
+} __packed;
+
+/**
+ * struct ipu3_uapi_unsharp_coef1 - Unsharp mask coefficients
+ *
+ * @c11: Coeff22, s0.8, range -255 - 255, default 29.
+ * @c12: Coeff23, s0.8, range -255 - 255, default 55.
+ * @c22: Coeff33, s0.8, range -255 - 255, default 96.
+ * @__reserved: reserved
+ */
+struct ipu3_uapi_unsharp_coef1 {
+	__u32 c11:9;
+	__u32 c12:9;
+	__u32 c22:9;
+	__u32 __reserved:5;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_unshrp_cfg - Unsharp mask config
+ *
+ * @unsharp_coef0: unsharp coefficient 0 config. See &ipu3_uapi_unsharp_coef0
+ * @unsharp_coef1: unsharp coefficient 1 config. See &ipu3_uapi_unsharp_coef1
+ */
+struct ipu3_uapi_yuvp1_iefd_unshrp_cfg {
+	struct ipu3_uapi_unsharp_coef0 unsharp_coef0;
+	struct ipu3_uapi_unsharp_coef1 unsharp_coef1;
+} __packed;
+
+/**
+ * struct ipu3_uapi_radial_reset_xy - Radial coordinate reset
+ *
+ * @x:	Radial reset of x coordinate. Precision s12, [-4095 .. 4095], default 0.
+ * @__reserved0:	reserved
+ * @y:	Radial center y coordinate. Precision s12, [-4095 .. 4095], default 0.
+ * @__reserved1:	reserved
+ */
+struct ipu3_uapi_radial_reset_xy {
+	__s32 x:13;
+	__u32 __reserved0:3;
+	__s32 y:13;
+	__u32 __reserved1:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_radial_reset_x2 - Radial X^2 reset
+ *
+ * @x2:	Radial reset of x^2 coordinate. Precision u24, default 0.
+ * @__reserved:	reserved
+ */
+struct ipu3_uapi_radial_reset_x2 {
+	__u32 x2:24;
+	__u32 __reserved:8;
+} __packed;
+
+/**
+ * struct ipu3_uapi_radial_reset_y2 - Radial Y^2 reset
+ *
+ * @y2:	Radial reset of y^2 coordinate. Precision u24, default 0.
+ * @__reserved:	reserved
+ */
+struct ipu3_uapi_radial_reset_y2 {
+	__u32 y2:24;
+	__u32 __reserved:8;
+} __packed;
+
+/**
+ * struct ipu3_uapi_radial_cfg - Radial config
+ *
+ * @rad_nf: Radial. R^2 normalization factor is scale down by 2^ - (15 + scale)
+ * @__reserved0: reserved
+ * @rad_inv_r2: Radial R^-2 normelized to (0.5..1), Prec' u7, range [0 .. 127].
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_radial_cfg {
+	__u32 rad_nf:4;
+	__u32 __reserved0:4;
+	__u32 rad_inv_r2:7;
+	__u32 __reserved1:17;
+} __packed;
+
+/**
+ * struct ipu3_uapi_rad_far_w - Radial FAR sub-group
+ *
+ * @rad_dir_far_sharp_w: Weight of wide direct sharpening, u1.6, range 0-64,
+ *			 default 64.
+ * @rad_dir_far_dns_w: Weight of wide direct denoising, u1.6, range 0-64,
+ *			 default 0.
+ * @rad_ndir_far_dns_power: power of non-direct sharpening, u1.6, range 0-64,
+ *			 default 0.
+ * @__reserved: reserved
+ */
+struct ipu3_uapi_rad_far_w {
+	__u32 rad_dir_far_sharp_w:8;
+	__u32 rad_dir_far_dns_w:8;
+	__u32 rad_ndir_far_dns_power:8;
+	__u32 __reserved:8;
+} __packed;
+
+/**
+ * struct ipu3_uapi_cu_cfg0 - Radius Config Unit cfg0 register
+ *
+ * @cu6_pow: Power of CU6. Power of non-direct sharpening, u3.4.
+ * @__reserved0: reserved
+ * @cu_unsharp_pow: Power of unsharp mask, u2.4.
+ * @__reserved1: reserved
+ * @rad_cu6_pow: Radial/corner CU6. Directed sharpening power, u3.4.
+ * @__reserved2: reserved
+ * @rad_cu_unsharp_pow: Radial power of unsharp mask, u2.4.
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_cu_cfg0 {
+	__u32 cu6_pow:7;
+	__u32 __reserved0:1;
+	__u32 cu_unsharp_pow:7;
+	__u32 __reserved1:1;
+	__u32 rad_cu6_pow:7;
+	__u32 __reserved2:1;
+	__u32 rad_cu_unsharp_pow:6;
+	__u32 __reserved3:2;
+} __packed;
+
+/**
+ * struct ipu3_uapi_cu_cfg1 - Radius Config Unit cfg1 register
+ *
+ * @rad_cu6_x1: X1 point of Config Unit 6, precision u9.0.
+ * @__reserved0: reserved
+ * @rad_cu_unsharp_x1: X1 point for Config Unit unsharp for radial/corner point
+ *			precision u9.0.
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_cu_cfg1 {
+	__u32 rad_cu6_x1:9;
+	__u32 __reserved0:1;
+	__u32 rad_cu_unsharp_x1:9;
+	__u32 __reserved1:13;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_rad_cfg - IEFd parameters changed radially over
+ *					 the picture plain.
+ *
+ * @reset_xy: reset xy value in radial calculation. &ipu3_uapi_radial_reset_xy
+ * @reset_x2: reset x square value in radial calculation. See struct
+ *	      &ipu3_uapi_radial_reset_x2
+ * @reset_y2: reset y square value in radial calculation, see struct
+ *	      &ipu3_uapi_radial_reset_y2
+ * @cfg: radial config defined in &ipu3_uapi_radial_cfg
+ * @rad_far_w: weight for wide range radial. &ipu3_uapi_rad_far_w
+ * @cu_cfg0: configuration unit 0. See &ipu3_uapi_cu_cfg0
+ * @cu_cfg1: configuration unit 1. See &ipu3_uapi_cu_cfg1
+ */
+struct ipu3_uapi_yuvp1_iefd_rad_cfg {
+	struct ipu3_uapi_radial_reset_xy reset_xy;
+	struct ipu3_uapi_radial_reset_x2 reset_x2;
+	struct ipu3_uapi_radial_reset_y2 reset_y2;
+	struct ipu3_uapi_radial_cfg cfg;
+	struct ipu3_uapi_rad_far_w rad_far_w;
+	struct ipu3_uapi_cu_cfg0 cu_cfg0;
+	struct ipu3_uapi_cu_cfg1 cu_cfg1;
+} __packed;
+
+/* Vssnlm - Very small scale non-local mean algorithm */
+
+/**
+ * struct ipu3_uapi_vss_lut_x - Vssnlm LUT x0/x1/x2
+ *
+ * @vs_x0: Vssnlm LUT x0, precision u8, range 0-255, default 16.
+ * @vs_x1: Vssnlm LUT x1, precision u8, range 0-255, default 32.
+ * @vs_x2: Vssnlm LUT x2, precision u8, range 0-255, default 64.
+ * @__reserved2: reserved
+ */
+struct ipu3_uapi_vss_lut_x {
+	__u32 vs_x0:8;
+	__u32 vs_x1:8;
+	__u32 vs_x2:8;
+	__u32 __reserved2:8;
+} __packed;
+
+/**
+ * struct ipu3_uapi_vss_lut_y - Vssnlm LUT y0/y1/y2
+ *
+ * @vs_y1: Vssnlm LUT y1, precision u4, range 0-8, default 1.
+ * @__reserved0: reserved
+ * @vs_y2: Vssnlm LUT y2, precision u4, range 0-8, default 3.
+ * @__reserved1: reserved
+ * @vs_y3: Vssnlm LUT y3, precision u4, range 0-8, default 8.
+ * @__reserved2: reserved
+ */
+struct ipu3_uapi_vss_lut_y {
+	__u32 vs_y1:4;
+	__u32 __reserved0:4;
+	__u32 vs_y2:4;
+	__u32 __reserved1:4;
+	__u32 vs_y3:4;
+	__u32 __reserved2:12;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_vssnlm_cf - IEFd Vssnlm Lookup table
+ *
+ * @vss_lut_x: vss lookup table. See &ipu3_uapi_vss_lut_x description
+ * @vss_lut_y: vss lookup table. See &ipu3_uapi_vss_lut_y description
+ */
+struct ipu3_uapi_yuvp1_iefd_vssnlm_cfg {
+	struct ipu3_uapi_vss_lut_x vss_lut_x;
+	struct ipu3_uapi_vss_lut_y vss_lut_y;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_iefd_config - IEFd config
+ *
+ * @units: configuration unit setting, &ipu3_uapi_yuvp1_iefd_cfg_units
+ * @config: configuration, as defined by &ipu3_uapi_yuvp1_iefd_config_s
+ * @control: control setting, as defined by &ipu3_uapi_yuvp1_iefd_control
+ * @sharp: sharpness setting, as defined by &ipu3_uapi_yuvp1_iefd_shrp_cfg
+ * @unsharp: unsharpness setting, as defined by &ipu3_uapi_yuvp1_iefd_unshrp_cfg
+ * @rad: radial setting, as defined by &ipu3_uapi_yuvp1_iefd_rad_cfg
+ * @vsslnm: vsslnm setting, as defined by &ipu3_uapi_yuvp1_iefd_vssnlm_cfg
+ */
+struct ipu3_uapi_yuvp1_iefd_config {
+	struct ipu3_uapi_yuvp1_iefd_cfg_units units;
+	struct ipu3_uapi_yuvp1_iefd_config_s config;
+	struct ipu3_uapi_yuvp1_iefd_control control;
+	struct ipu3_uapi_yuvp1_iefd_shrp_cfg sharp;
+	struct ipu3_uapi_yuvp1_iefd_unshrp_cfg unsharp;
+	struct ipu3_uapi_yuvp1_iefd_rad_cfg rad;
+	struct ipu3_uapi_yuvp1_iefd_vssnlm_cfg vsslnm;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_yds_config - Y Down-Sampling config
+ *
+ * @c00: range 0, 3, default 0x0
+ * @c01: range 0, 3, default 0x1
+ * @c02: range 0, 3, default 0x1
+ * @c03: range 0, 3, default 0x0
+ * @c10: range 0, 3, default 0x0
+ * @c11: range 0, 3, default 0x1
+ * @c12: range 0, 3, default 0x1
+ * @c13: range 0, 3, default 0x0
+ *
+ * Above are 4x2 filter coefficients for chroma output downscaling.
+ *
+ * @norm_factor: Normalization factor, range 0, 4, default 2
+ *		0 - divide by 1
+ *		1 - divide by 2
+ *		2 - divide by 4
+ *		3 - divide by 8
+ *		4 - divide by 16
+ * @__reserved0: reserved
+ * @bin_output: Down sampling on Luma channel in two optional modes
+ *		0 - Bin output 4.2.0 (default), 1 output 4.2.2.
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_yuvp1_yds_config {
+	__u32 c00:2;
+	__u32 c01:2;
+	__u32 c02:2;
+	__u32 c03:2;
+	__u32 c10:2;
+	__u32 c11:2;
+	__u32 c12:2;
+	__u32 c13:2;
+	__u32 norm_factor:5;
+	__u32 __reserved0:4;
+	__u32 bin_output:1;
+	__u32 __reserved1:6;
+} __packed;
+
+/* Chroma Noise Reduction */
+
+/**
+ * struct ipu3_uapi_yuvp1_chnr_enable_config - Chroma noise reduction enable
+ *
+ * @enable: enable/disable chroma noise reduction
+ * @yuv_mode: 0 - YUV420, 1 - YUV422
+ * @__reserved0: reserved
+ * @col_size: number of columns in the frame, max width is 2560
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_yuvp1_chnr_enable_config {
+	__u32 enable:1;
+	__u32 yuv_mode:1;
+	__u32 __reserved0:14;
+	__u32 col_size:12;
+	__u32 __reserved1:4;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_chnr_coring_config - Coring thresholds for UV
+ *
+ * @u: U coring level, u0.13, range [0.0, 1.0), default 0.0
+ * @__reserved0: reserved
+ * @v: V coring level, u0.13, range [0.0, 1.0), default 0.0
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_yuvp1_chnr_coring_config {
+	__u32 u:13;
+	__u32 __reserved0:3;
+	__u32 v:13;
+	__u32 __reserved1:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_chnr_sense_gain_config - Chroma noise reduction gains
+ *
+ * All sensitivity gain parameters have precision u13.0, range [0, 8191].
+ *
+ * @vy: Sensitivity of horizontal edge of Y, default 100
+ * @vu: Sensitivity of horizontal edge of U, default 100
+ * @vv: Sensitivity of horizontal edge of V, default 100
+ * @__reserved0: reserved
+ * @hy: Sensitivity of vertical edge of Y, default 50
+ * @hu: Sensitivity of vertical edge of U, default 50
+ * @hv: Sensitivity of vertical edge of V, default 50
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_yuvp1_chnr_sense_gain_config {
+	__u32 vy:8;
+	__u32 vu:8;
+	__u32 vv:8;
+	__u32 __reserved0:8;
+
+	__u32 hy:8;
+	__u32 hu:8;
+	__u32 hv:8;
+	__u32 __reserved1:8;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_chnr_iir_fir_config - Chroma IIR/FIR filter config
+ *
+ * @fir_0h: Value of center tap in horizontal FIR, range [0..32], default 8.
+ * @__reserved0: reserved
+ * @fir_1h: Value of distance 1 in horizontal FIR, range [0..32], default 12.
+ * @__reserved1: reserved
+ * @fir_2h: Value of distance 2 tap in horizontal FIR, range [0..32], default 0.
+ * @dalpha_clip_val: weight for previous row in IIR, range [1..256], default 0.
+ * @__reserved2: reserved
+ */
+struct ipu3_uapi_yuvp1_chnr_iir_fir_config {
+	__u32 fir_0h:6;
+	__u32 __reserved0:2;
+	__u32 fir_1h:6;
+	__u32 __reserved1:2;
+	__u32 fir_2h:6;
+	__u32 dalpha_clip_val:9;
+	__u32 __reserved2:1;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_chnr_config - Chroma noise reduction config
+ *
+ * @enable: chroma noise reduction enable, see
+ *	    &ipu3_uapi_yuvp1_chnr_enable_config
+ * @coring: coring config for chroma noise reduction, see
+ *	    &ipu3_uapi_yuvp1_chnr_coring_config
+ * @sense_gain: sensitivity config for chroma noise reduction, see
+ *		ipu3_uapi_yuvp1_chnr_sense_gain_config
+ * @iir_fir: iir and fir config for chroma noise reduction, see
+ *	     ipu3_uapi_yuvp1_chnr_iir_fir_config
+ */
+struct ipu3_uapi_yuvp1_chnr_config {
+	struct ipu3_uapi_yuvp1_chnr_enable_config enable;
+	struct ipu3_uapi_yuvp1_chnr_coring_config coring;
+	struct ipu3_uapi_yuvp1_chnr_sense_gain_config sense_gain;
+	struct ipu3_uapi_yuvp1_chnr_iir_fir_config iir_fir;
+} __packed;
+
+/* Edge Enhancement and Noise Reduction */
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config - Luma(Y) edge enhancement low-pass
+ *					       filter coefficients
+ *
+ * @a_diag: Smoothing diagonal coefficient, u5.0.
+ * @__reserved0: reserved
+ * @a_periph: Image smoothing perpherial, u5.0.
+ * @__reserved1: reserved
+ * @a_cent: Image Smoothing center coefficient, u5.0.
+ * @__reserved2: reserved
+ * @enable: 0: Y_EE_NR disabled, output = input; 1: Y_EE_NR enabled.
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config {
+	__u32 a_diag:5;
+	__u32 __reserved0:3;
+	__u32 a_periph:5;
+	__u32 __reserved1:3;
+	__u32 a_cent:5;
+	__u32 __reserved2:9;
+	__u32 enable:1;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_sense_config - Luma(Y) edge enhancement
+ *					noise reduction sensitivity gains
+ *
+ * @edge_sense_0: Sensitivity of edge in dark area. u13.0, default 8191.
+ * @__reserved0: reserved
+ * @delta_edge_sense: Difference in the sensitivity of edges between
+ *		      the bright and dark areas. u13.0, default 0.
+ * @__reserved1: reserved
+ * @corner_sense_0: Sensitivity of corner in dark area. u13.0, default 0.
+ * @__reserved2: reserved
+ * @delta_corner_sense: Difference in the sensitivity of corners between
+ *			the bright and dark areas. u13.0, default 8191.
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_sense_config {
+	__u32 edge_sense_0:13;
+	__u32 __reserved0:3;
+	__u32 delta_edge_sense:13;
+	__u32 __reserved1:3;
+	__u32 corner_sense_0:13;
+	__u32 __reserved2:3;
+	__u32 delta_corner_sense:13;
+	__u32 __reserved3:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_gain_config - Luma(Y) edge enhancement
+ *						noise reduction gain config
+ *
+ * @gain_pos_0: Gain for positive edge in dark area. u5.0, [0,16], default 2.
+ * @__reserved0: reserved
+ * @delta_gain_posi: Difference in the gain of edges between the bright and
+ *		     dark areas for positive edges. u5.0, [0,16], default 0.
+ * @__reserved1: reserved
+ * @gain_neg_0: Gain for negative edge in dark area. u5.0, [0,16], default 8.
+ * @__reserved2: reserved
+ * @delta_gain_neg: Difference in the gain of edges between the bright and
+ *		    dark areas for negative edges. u5.0, [0,16], default 0.
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_gain_config {
+	__u32 gain_pos_0:5;
+	__u32 __reserved0:3;
+	__u32 delta_gain_posi:5;
+	__u32 __reserved1:3;
+	__u32 gain_neg_0:5;
+	__u32 __reserved2:3;
+	__u32 delta_gain_neg:5;
+	__u32 __reserved3:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_clip_config - Luma(Y) edge enhancement
+ *					noise reduction clipping config
+ *
+ * @clip_pos_0: Limit of positive edge in dark area
+ * @__reserved0: reserved
+ * @delta_clip_posi: Difference in the limit of edges between the bright
+ *		     and dark areas for positive edges.
+ * @__reserved1: reserved
+ * @clip_neg_0: Limit of negative edge in dark area
+ * @__reserved2: reserved
+ * @delta_clip_neg: Difference in the limit of edges between the bright
+ *		    and dark areas for negative edges.
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_clip_config {
+	__u32 clip_pos_0:5;
+	__u32 __reserved0:3;
+	__u32 delta_clip_posi:5;
+	__u32 __reserved1:3;
+	__u32 clip_neg_0:5;
+	__u32 __reserved2:3;
+	__u32 delta_clip_neg:5;
+	__u32 __reserved3:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_frng_config - Luma(Y) edge enhancement
+ *						noise reduction fringe config
+ *
+ * @gain_exp: Common exponent of gains, u4, [0,8], default 2.
+ * @__reserved0: reserved
+ * @min_edge: Threshold for edge and smooth stitching, u13.
+ * @__reserved1: reserved
+ * @lin_seg_param: Power of LinSeg, u4.
+ * @__reserved2: reserved
+ * @t1: Parameter for enabling/disabling the edge enhancement, u1.0, [0,1],
+ *	default 1.
+ * @t2: Parameter for enabling/disabling the smoothing, u1.0, [0,1],
+ *	default 1.
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_frng_config {
+	__u32 gain_exp:4;
+	__u32 __reserved0:28;
+	__u32 min_edge:13;
+	__u32 __reserved1:3;
+	__u32 lin_seg_param:4;
+	__u32 __reserved2:4;
+	__u32 t1:1;
+	__u32 t2:1;
+	__u32 __reserved3:6;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_diag_config - Luma(Y) edge enhancement
+ *					noise reduction diagonal config
+ *
+ * @diag_disc_g: Coefficient that prioritize diagonal edge direction on
+ *		 horizontal or vertical for final enhancement.
+ *		 u4.0, [1,15], default 1.
+ * @__reserved0: reserved
+ * @hvw_hor: Weight of horizontal/vertical edge enhancement for hv edge.
+ *		u2.2, [1,15], default 4.
+ * @dw_hor: Weight of diagonal edge enhancement for hv edge.
+ *		u2.2, [1,15], default 1.
+ * @hvw_diag: Weight of horizontal/vertical edge enhancement for diagonal edge.
+ *		u2.2, [1,15], default 1.
+ * @dw_diag: Weight of diagonal edge enhancement for diagonal edge.
+ *		u2.2, [1,15], default 4.
+ * @__reserved1: reserved
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_diag_config {
+	__u32 diag_disc_g:4;
+	__u32 __reserved0:4;
+	__u32 hvw_hor:4;
+	__u32 dw_hor:4;
+	__u32 hvw_diag:4;
+	__u32 dw_diag:4;
+	__u32 __reserved1:8;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config - Luma(Y) edge enhancement
+ *		noise reduction false color correction (FCC) coring config
+ *
+ * @pos_0: Gain for positive edge in dark, u13.0, [0..16], default 0.
+ * @__reserved0: reserved
+ * @pos_delta: Gain for positive edge in bright, value: pos_0 + pos_delta <=16
+ *		u13.0, default 0.
+ * @__reserved1: reserved
+ * @neg_0: Gain for negative edge in dark area, u13.0, range [0..16], default 0.
+ * @__reserved2: reserved
+ * @neg_delta: Gain for negative edge in bright area. neg_0 + neg_delta <=16
+ *		u13.0, default 0.
+ * @__reserved3: reserved
+ *
+ * Coring is a simple soft thresholding technique.
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config {
+	__u32 pos_0:13;
+	__u32 __reserved0:3;
+	__u32 pos_delta:13;
+	__u32 __reserved1:3;
+	__u32 neg_0:13;
+	__u32 __reserved2:3;
+	__u32 neg_delta:13;
+	__u32 __reserved3:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp1_y_ee_nr_config - Edge enhancement and noise reduction
+ *
+ * @lpf: low-pass filter config. See &ipu3_uapi_yuvp1_y_ee_nr_lpf_config
+ * @sense: sensitivity config. See &ipu3_uapi_yuvp1_y_ee_nr_sense_config
+ * @gain: gain config as defined in &ipu3_uapi_yuvp1_y_ee_nr_gain_config
+ * @clip: clip config as defined in &ipu3_uapi_yuvp1_y_ee_nr_clip_config
+ * @frng: fringe config as defined in &ipu3_uapi_yuvp1_y_ee_nr_frng_config
+ * @diag: diagonal edge config. See &ipu3_uapi_yuvp1_y_ee_nr_diag_config
+ * @fc_coring: coring config for fringe control. See
+ *	       &ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config
+ */
+struct ipu3_uapi_yuvp1_y_ee_nr_config {
+	struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config lpf;
+	struct ipu3_uapi_yuvp1_y_ee_nr_sense_config sense;
+	struct ipu3_uapi_yuvp1_y_ee_nr_gain_config gain;
+	struct ipu3_uapi_yuvp1_y_ee_nr_clip_config clip;
+	struct ipu3_uapi_yuvp1_y_ee_nr_frng_config frng;
+	struct ipu3_uapi_yuvp1_y_ee_nr_diag_config diag;
+	struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config fc_coring;
+} __packed;
+
+/* Total Color Correction */
+
+/**
+ * struct ipu3_uapi_yuvp2_tcc_gen_control_static_config - Total color correction
+ *				general control config
+ *
+ * @en:	0 – TCC disabled. Output = input 1 – TCC enabled.
+ * @blend_shift:	blend shift, Range[3,4]
+ * @gain_according_to_y_only:	0: Gain is calculated according to YUV,
+ *				1: Gain is calculated according to Y only
+ * @__reserved0: reserved
+ * @gamma:	Final blending coefficients.
+ * @__reserved1: reserved
+ * @delta:	Final blending coefficients.
+ * @__reserved2: reserved
+ */
+struct ipu3_uapi_yuvp2_tcc_gen_control_static_config {
+	__u32 en:1;
+	__u32 blend_shift:3;
+	__u32 gain_according_to_y_only:1;
+	__u32 __reserved0:11;
+	__s32 gamma:5;
+	__u32 __reserved1:3;
+	__s32 delta:5;
+	__u32 __reserved2:3;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config - Total color correction
+ *				multi-axis color control (MACC) config
+ *
+ * @a: a coefficient for 2x2 MACC conversion matrix.
+ * @__reserved0: reserved
+ * @b: b coefficient  2x2 MACC conversion matrix.
+ * @__reserved1: reserved
+ * @c: c coefficient for 2x2 MACC conversion matrix.
+ * @__reserved2: reserved
+ * @d: d coefficient for 2x2 MACC conversion matrix.
+ * @__reserved3: reserved
+ */
+struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config {
+	__s32 a:12;
+	__u32 __reserved0:4;
+	__s32 b:12;
+	__u32 __reserved1:4;
+	__s32 c:12;
+	__u32 __reserved2:4;
+	__s32 d:12;
+	__u32 __reserved3:4;
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp2_tcc_macc_table_static_config - Total color correction
+ *				multi-axis color control (MACC) table array
+ *
+ * @entries: config for multi axis color correction, as specified by
+ *	     &ipu3_uapi_yuvp2_tcc_macc_elem_static_config
+ */
+struct ipu3_uapi_yuvp2_tcc_macc_table_static_config {
+	struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config
+		entries[IPU3_UAPI_YUVP2_TCC_MACC_TABLE_ELEMENTS];
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config - Total color correction
+ *				inverse y lookup table
+ *
+ * @entries: lookup table for inverse y estimation, and use it to estimate the
+ *	     ratio between luma and chroma. Chroma by approximate the absolute
+ *	     value of the radius on the chroma plane (R = sqrt(u^2+v^2) ) and
+ *	     luma by approximate by 1/Y.
+ */
+struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config {
+	__u16 entries[IPU3_UAPI_YUVP2_TCC_INV_Y_LUT_ELEMENTS];
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config - Total color
+ *					correction lookup table for PCWL
+ *
+ * @entries: lookup table for gain piece wise linear transformation (PCWL)
+ */
+struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config {
+	__u16 entries[IPU3_UAPI_YUVP2_TCC_GAIN_PCWL_LUT_ELEMENTS];
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config - Total color correction
+ *				lookup table for r square root
+ *
+ * @entries: lookup table for r square root estimation
+ */
+struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config {
+	__s16 entries[IPU3_UAPI_YUVP2_TCC_R_SQR_LUT_ELEMENTS];
+} __packed;
+
+/**
+ * struct ipu3_uapi_yuvp2_tcc_static_config- Total color correction static
+ *
+ * @gen_control: general config for Total Color Correction
+ * @macc_table: config for multi axis color correction
+ * @inv_y_lut: lookup table for inverse y estimation
+ * @gain_pcwl: lookup table for gain PCWL
+ * @r_sqr_lut: lookup table for r square root estimation.
+ */
+struct ipu3_uapi_yuvp2_tcc_static_config {
+	struct ipu3_uapi_yuvp2_tcc_gen_control_static_config gen_control;
+	struct ipu3_uapi_yuvp2_tcc_macc_table_static_config macc_table;
+	struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config inv_y_lut;
+	struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config gain_pcwl;
+	struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config r_sqr_lut;
+} __packed;
+
+/* Advanced Noise Reduction related structs */
+
+/*
+ * struct ipu3_uapi_anr_alpha - Advanced noise reduction alpha
+ *
+ * Tunable parameters that are subject to modification according to the
+ * total gain used.
+ */
+struct ipu3_uapi_anr_alpha {
+	__u16 gr;
+	__u16 r;
+	__u16 b;
+	__u16 gb;
+	__u16 dc_gr;
+	__u16 dc_r;
+	__u16 dc_b;
+	__u16 dc_gb;
+} __packed;
+
+/*
+ * struct ipu3_uapi_anr_beta - Advanced noise reduction beta
+ *
+ * Tunable parameters that are subject to modification according to the
+ * total gain used.
+ */
+struct ipu3_uapi_anr_beta {
+	__u16 beta_gr;
+	__u16 beta_r;
+	__u16 beta_b;
+	__u16 beta_gb;
+} __packed;
+
+/*
+ * struct ipu3_uapi_anr_plain_color - Advanced noise reduction plain color with
+ *				      4x4 matrix
+ *
+ * Tunable parameters that are subject to modification according to the
+ * total gain used.
+ */
+struct ipu3_uapi_anr_plain_color {
+	__u16 reg_w_gr[16];
+	__u16 reg_w_r[16];
+	__u16 reg_w_b[16];
+	__u16 reg_w_gb[16];
+} __packed;
+
+/**
+ * struct ipu3_uapi_anr_transform_config - Advanced noise reduction transform
+ *
+ * @enable: advanced noise reduction enabled.
+ * @adaptive_treshhold_en: On IPU3, adaptive threshold is always enabled.
+ * @__reserved1: reserved
+ * @__reserved2: reserved
+ * @alpha: using follow defaults:
+ *		13, 13, 13, 13, 0, 0, 0, 0
+ *		11, 11, 11, 11, 0, 0, 0, 0
+ *		14,  14, 14, 14, 0, 0, 0, 0
+ * @beta: use following defaults:
+ *		24, 24, 24, 24
+ *		21, 20, 20, 21
+ *		25, 25, 25, 25
+ * @color: use defaults defined in driver/media/pci/intel/ipu3-tables.c
+ * @sqrt_lut: 11 bits per element, values =
+ *					[724 768 810 849 887
+ *					923 958 991 1024 1056
+ *					1116 1145 1173 1201 1086
+ *					1228 1254 1280 1305 1330
+ *					1355 1379 1402 1425 1448]
+ * @xreset: Reset value of X for r^2 calculation Value: col_start-X_center
+ *	Constraint: Xreset + FrameWdith≤4095 Xreset≥ -4095, default -1632.
+ * @__reserved3: reserved
+ * @yreset: Reset value of Y for r^2 calculation Value: row_start-Y_center
+ *	 Constraint: Yreset + FrameHeight≤4095 Yreset≥ -4095, default -1224.
+ * @__reserved4: reserved
+ * @x_sqr_reset: Reset value of X^2 for r^2 calculation Value = (Xreset)^2
+ * @r_normfactor: Normalization factor for R. Default 14.
+ * @__reserved5: reserved
+ * @y_sqr_reset: Reset value of Y^2 for r^2 calculation Value = (Yreset)^2
+ * @gain_scale: Parameter describing shading gain as a function of distance
+ *		from the image center.
+ *		A single value per frame, loaded by the driver. Default 115.
+ */
+struct ipu3_uapi_anr_transform_config {
+	__u32 enable:1;			/* 0 or 1, disabled or enabled */
+	__u32 adaptive_treshhold_en:1;	/* On IPU3, always enabled */
+
+	__u32 __reserved1:30;
+	__u8 __reserved2[44];
+
+	struct ipu3_uapi_anr_alpha alpha[3];
+	struct ipu3_uapi_anr_beta beta[3];
+	struct ipu3_uapi_anr_plain_color color[3];
+
+	__u16 sqrt_lut[IPU3_UAPI_ANR_LUT_SIZE];	/* 11 bits per element */
+
+	__s16 xreset:13;
+	__u16 __reserved3:3;
+	__s16 yreset:13;
+	__u16 __reserved4:3;
+
+	__u32 x_sqr_reset:24;
+	__u32 r_normfactor:5;
+	__u32 __reserved5:3;
+
+	__u32 y_sqr_reset:24;
+	__u32 gain_scale:8;
+} __packed;
+
+/**
+ * struct ipu3_uapi_anr_stitch_pyramid - ANR stitch pyramid
+ *
+ * @entry0: pyramid LUT entry0, range [0x0..0x3F]
+ * @entry1: pyramid LUT entry1, range [0x0..0x3F]
+ * @entry2: pyramid LUT entry2, range [0x0..0x3F]
+ * @__reserved: reserved
+ */
+struct ipu3_uapi_anr_stitch_pyramid {
+	__u32 entry0:6;
+	__u32 entry1:6;
+	__u32 entry2:6;
+	__u32 __reserved:14;
+} __packed;
+
+/**
+ * struct ipu3_uapi_anr_stitch_config - ANR stitch config
+ *
+ * @anr_stitch_en: enable stitch. Enabled with 1.
+ * @__reserved: reserved
+ * @pyramid: pyramid table as defined by &ipu3_uapi_anr_stitch_pyramid
+ *		default values:
+ *		{ 1, 3, 5 }, { 7, 7, 5 }, { 3, 1, 3 },
+ *		{ 9, 15, 21 }, { 21, 15, 9 }, { 3, 5, 15 },
+ *		{ 25, 35, 35 }, { 25, 15, 5 }, { 7, 21, 35 },
+ *		{ 49, 49, 35 }, { 21, 7, 7 }, { 21, 35, 49 },
+ *		{ 49, 35, 21 }, { 7, 5, 15 }, { 25, 35, 35 },
+ *		{ 25, 15, 5 }, { 3, 9, 15 }, { 21, 21, 15 },
+ *		{ 9, 3, 1 }, { 3, 5, 7 }, { 7, 5, 3}, { 1 }
+ */
+struct ipu3_uapi_anr_stitch_config {
+	__u32 anr_stitch_en;
+	__u8 __reserved[44];
+	struct ipu3_uapi_anr_stitch_pyramid pyramid[IPU3_UAPI_ANR_PYRAMID_SIZE];
+} __packed;
+
+/**
+ * struct ipu3_uapi_anr_config - ANR config
+ *
+ * @__reserved1: reserved
+ * @transform:	advanced noise reduction transform config as specified by
+ *		&ipu3_uapi_anr_transform_config
+ * @stitch: create 4x4 patch from 4 surrounding 8x8 patches.
+ * @__reserved2: reserved
+ */
+struct ipu3_uapi_anr_config {
+	IPU3_ALIGN __u8 __reserved1[8];
+	IPU3_ALIGN struct ipu3_uapi_anr_transform_config transform;
+	IPU3_ALIGN struct ipu3_uapi_anr_stitch_config stitch;
+	IPU3_ALIGN __u8 __reserved2[8];
+} __packed;
+
+/**
+ * struct ipu3_uapi_acc_param - Accelerator cluster parameters
+ *
+ * ACC refers to the HW cluster containing all Fixed Functions(FFs). Each FF
+ * implements a specific algorithm.
+ *
+ * @bnr:	parameters for bayer noise reduction static config. See
+ *		&ipu3_uapi_bnr_static_config
+ * @green_disparity:	disparity static config between gr and gb channel.
+ *			See &ipu3_uapi_bnr_static_config_green_disparity
+ * @dm:	de-mosaic config. See &ipu3_uapi_dm_config
+ * @ccm:	color correction matrix. See &ipu3_uapi_ccm_mat_config
+ * @gamma:	gamma correction config. See &ipu3_uapi_gamma_config
+ * @csc:	color space conversion matrix. See &ipu3_uapi_csc_mat_config
+ * @cds:	color down sample config. See &ipu3_uapi_cds_params
+ * @shd:	lens shading correction config. See &ipu3_uapi_shd_config
+ * @iefd:	Image enhancement filter and denoise config.
+ *		&ipu3_uapi_yuvp1_iefd_config
+ * @yds_c0:	y down scaler config. &ipu3_uapi_yuvp1_yds_config
+ * @chnr_c0:	chroma noise reduction config. &ipu3_uapi_yuvp1_chnr_config
+ * @y_ee_nr:	y edge enhancement and noise reduction config.
+ *		&ipu3_uapi_yuvp1_y_ee_nr_config
+ * @yds:	y down scaler config. See &ipu3_uapi_yuvp1_yds_config
+ * @chnr:	chroma noise reduction config. See &ipu3_uapi_yuvp1_chnr_config
+ * @__reserved1: reserved
+ * @yds2:	y channel down scaler config. See &ipu3_uapi_yuvp1_yds_config
+ * @tcc:	total color correction config as defined in struct
+ *		&ipu3_uapi_yuvp2_tcc_static_config
+ * @__reserved2: reserved
+ * @anr:	advanced noise reduction config.See &ipu3_uapi_anr_config
+ * @awb_fr:	AWB filter response config. See ipu3_uapi_awb_fr_config
+ * @ae:	auto exposure config  As specified by &ipu3_uapi_ae_config
+ * @af:	auto focus config. As specified by &ipu3_uapi_af_config
+ * @awb:	auto white balance config. As specified by &ipu3_uapi_awb_config
+ */
+struct ipu3_uapi_acc_param {
+	struct ipu3_uapi_bnr_static_config bnr;
+	IPU3_ALIGN struct ipu3_uapi_bnr_static_config_green_disparity
+				green_disparity;
+	IPU3_ALIGN struct ipu3_uapi_dm_config dm;
+	IPU3_ALIGN struct ipu3_uapi_ccm_mat_config ccm;
+	IPU3_ALIGN struct ipu3_uapi_gamma_config gamma;
+	IPU3_ALIGN struct ipu3_uapi_csc_mat_config csc;
+	IPU3_ALIGN struct ipu3_uapi_cds_params cds;
+	IPU3_ALIGN struct ipu3_uapi_shd_config shd;
+	IPU3_ALIGN struct ipu3_uapi_yuvp1_iefd_config iefd;
+	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds_c0;
+	IPU3_ALIGN struct ipu3_uapi_yuvp1_chnr_config chnr_c0;
+	IPU3_ALIGN struct ipu3_uapi_yuvp1_y_ee_nr_config y_ee_nr;
+	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds;
+	IPU3_ALIGN struct ipu3_uapi_yuvp1_chnr_config chnr;
+	IPU3_ALIGN __u8 __reserved1[516];
+	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds2;
+	IPU3_ALIGN struct ipu3_uapi_yuvp2_tcc_static_config tcc;
+	__u8 __reserved2[1152];
+	struct ipu3_uapi_anr_config anr;
+	struct ipu3_uapi_awb_fr_config awb_fr;
+	struct ipu3_uapi_ae_config ae;
+	struct ipu3_uapi_af_config af;
+	struct ipu3_uapi_awb_config awb;
+} __packed;
+
+/**
+ * struct ipu3_uapi_isp_lin_vmem_params - Linearization parameters
+ *
+ * @lin_lutlow_gr: linearization look-up table for GR channel interpolation.
+ * @lin_lutlow_r: linearization look-up table for R channel interpolation.
+ * @lin_lutlow_b: linearization look-up table for B channel interpolation.
+ * @lin_lutlow_gb: linearization look-up table for GB channel interpolation.
+ *			lin_lutlow_gr / lin_lutlow_gr / lin_lutlow_gr /
+ *			lin_lutlow_gr <= LIN_MAX_VALUE - 1.
+ * @lin_lutdif_gr:	lin_lutlow_gr[i+1] - lin_lutlow_gr[i].
+ * @lin_lutdif_r:	lin_lutlow_r[i+1] - lin_lutlow_r[i].
+ * @lin_lutdif_b:	lin_lutlow_b[i+1] - lin_lutlow_b[i].
+ * @lin_lutdif_gb:	lin_lutlow_gb[i+1] - lin_lutlow_gb[i].
+ */
+struct ipu3_uapi_isp_lin_vmem_params {
+	__s16 lin_lutlow_gr[IPU3_UAPI_LIN_LUT_SIZE];
+	__s16 lin_lutlow_r[IPU3_UAPI_LIN_LUT_SIZE];
+	__s16 lin_lutlow_b[IPU3_UAPI_LIN_LUT_SIZE];
+	__s16 lin_lutlow_gb[IPU3_UAPI_LIN_LUT_SIZE];
+	__s16 lin_lutdif_gr[IPU3_UAPI_LIN_LUT_SIZE];
+	__s16 lin_lutdif_r[IPU3_UAPI_LIN_LUT_SIZE];
+	__s16 lin_lutdif_b[IPU3_UAPI_LIN_LUT_SIZE];
+	__s16 lin_lutdif_gb[IPU3_UAPI_LIN_LUT_SIZE];
+} __packed;
+
+/* Temporal Noise Reduction */
+
+/**
+ * struct ipu3_uapi_isp_tnr3_vmem_params - Temporal noise reduction vector
+ *					   memory parameters
+ *
+ * @slope: slope setting in interpolation curve for temporal noise reduction.
+ * @__reserved1: reserved
+ * @sigma: knee point setting in interpolation curve for temporal
+ *	   noise reduction.
+ * @__reserved2: reserved
+ */
+struct ipu3_uapi_isp_tnr3_vmem_params {
+	__u16 slope[IPU3_UAPI_ISP_TNR3_VMEM_LEN];
+	__u16 __reserved1[IPU3_UAPI_ISP_VEC_ELEMS
+						- IPU3_UAPI_ISP_TNR3_VMEM_LEN];
+	__u16 sigma[IPU3_UAPI_ISP_TNR3_VMEM_LEN];
+	__u16 __reserved2[IPU3_UAPI_ISP_VEC_ELEMS
+						- IPU3_UAPI_ISP_TNR3_VMEM_LEN];
+} __packed;
+
+/**
+ * struct ipu3_uapi_isp_tnr3_params - Temporal noise reduction v3 parameters
+ *
+ * @knee_y1: Knee point TNR3 assumes standard deviation of Y,U and
+ *	V at Y1 are TnrY1_Sigma_Y, U and V.
+ * @knee_y2: Knee point TNR3 assumes standard deviation of Y,U and
+ *		V at Y2 are TnrY2_Sigma_Y, U and V.
+ * @maxfb_y: Max feedback gain for Y
+ * @maxfb_u: Max feedback gain for U
+ * @maxfb_v: Max feedback gain for V
+ * @round_adj_y: rounding Adjust for Y
+ * @round_adj_u: rounding Adjust for U
+ * @round_adj_v: rounding Adjust for V
+ * @ref_buf_select: selection of the reference frame buffer to be used.
+ */
+struct ipu3_uapi_isp_tnr3_params {
+	__u32 knee_y1;
+	__u32 knee_y2;
+	__u32 maxfb_y;
+	__u32 maxfb_u;
+	__u32 maxfb_v;
+	__u32 round_adj_y;
+	__u32 round_adj_u;
+	__u32 round_adj_v;
+	__u32 ref_buf_select;
+} __packed;
+
+/* Extreme Noise Reduction version 3 */
+
+/**
+ * struct ipu3_uapi_isp_xnr3_vmem_params - Extreme noise reduction v3
+ *					   vector memory parameters
+ *
+ * @x: xnr3 parameters.
+ * @a: xnr3 parameters.
+ * @b: xnr3 parameters.
+ * @c: xnr3 parameters.
+ */
+struct ipu3_uapi_isp_xnr3_vmem_params {
+	__u16 x[IPU3_UAPI_ISP_VEC_ELEMS];
+	__u16 a[IPU3_UAPI_ISP_VEC_ELEMS];
+	__u16 b[IPU3_UAPI_ISP_VEC_ELEMS];
+	__u16 c[IPU3_UAPI_ISP_VEC_ELEMS];
+} __packed;
+
+/**
+ * struct ipu3_uapi_xnr3_alpha_params - Extreme noise reduction v3
+ *					alpha tuning parameters
+ *
+ * @y0: Sigma for Y range similarity in dark area.
+ * @u0: Sigma for U range similarity in dark area.
+ * @v0: Sigma for V range similarity in dark area.
+ * @ydiff: Sigma difference for Y between bright area and dark area.
+ * @udiff: Sigma difference for U between bright area and dark area.
+ * @vdiff: Sigma difference for V between bright area and dark area.
+ */
+struct ipu3_uapi_xnr3_alpha_params {
+	__u32 y0;
+	__u32 u0;
+	__u32 v0;
+	__u32 ydiff;
+	__u32 udiff;
+	__u32 vdiff;
+} __packed;
+
+/**
+ * struct ipu3_uapi_xnr3_coring_params - Extreme noise reduction v3
+ *					 coring parameters
+ *
+ * @u0: Coring Threshold of U channel in dark area.
+ * @v0: Coring Threshold of V channel in dark area.
+ * @udiff: Threshold difference of U channel between bright and dark area.
+ * @vdiff: Threshold difference of V channel between bright and dark area.
+ */
+struct ipu3_uapi_xnr3_coring_params {
+	__u32 u0;
+	__u32 v0;
+	__u32 udiff;
+	__u32 vdiff;
+} __packed;
+
+/**
+ * struct ipu3_uapi_xnr3_blending_params - Blending factor
+ *
+ * @strength: The factor for blending output with input. This is tuning
+ *	      parameterHigher values lead to more aggressive XNR operation.
+ */
+struct ipu3_uapi_xnr3_blending_params {
+	__u32 strength;
+} __packed;
+
+/**
+ * struct ipu3_uapi_isp_xnr3_params - Extreme noise reduction v3 parameters
+ *
+ * @alpha: parameters for xnr3 alpha. See &ipu3_uapi_xnr3_alpha_params
+ * @coring: parameters for xnr3 coring. See &ipu3_uapi_xnr3_coring_params
+ * @blending: parameters for xnr3 blending. See &ipu3_uapi_xnr3_blending_params
+ */
+struct ipu3_uapi_isp_xnr3_params {
+	struct ipu3_uapi_xnr3_alpha_params alpha;
+	struct ipu3_uapi_xnr3_coring_params coring;
+	struct ipu3_uapi_xnr3_blending_params blending;
+} __packed;
+
+/***** Obgrid (optical black level compensation) table entry *****/
+
+/**
+ * struct ipu3_uapi_obgrid_param - Optical black level compensation parameters
+ *
+ * @gr: Grid table values for color GR
+ * @r: Grid table values for color R
+ * @b: Grid table values for color B
+ * @gb: Grid table values for color GB
+ *
+ * Black level is different for red, green, and blue channels. So black level
+ * compensation is different per channel.
+ */
+struct ipu3_uapi_obgrid_param {
+	__u16 gr;
+	__u16 r;
+	__u16 b;
+	__u16 gb;
+} __packed;
+
+/******************* V4L2_META_FMT_IPU3_PARAMS *******************/
+
+/**
+ * struct ipu3_uapi_flags - bits to indicate which pipeline needs update
+ *
+ * @gdc: 0 = no update, 1 = update.
+ * @obgrid: 0 = no update, 1 = update.
+ * @__reserved1: Not used.
+ * @acc_bnr: 0 = no update, 1 = update.
+ * @acc_green_disparity: 0 = no update, 1 = update.
+ * @acc_dm: 0 = no update, 1 = update.
+ * @acc_ccm: 0 = no update, 1 = update.
+ * @acc_gamma: 0 = no update, 1 = update.
+ * @acc_csc: 0 = no update, 1 = update.
+ * @acc_cds: 0 = no update, 1 = update.
+ * @acc_shd: 0 = no update, 1 = update.
+ * @__reserved2: Not used.
+ * @acc_iefd: 0 = no update, 1 = update.
+ * @acc_yds_c0: 0 = no update, 1 = update.
+ * @acc_chnr_c0: 0 = no update, 1 = update.
+ * @acc_y_ee_nr: 0 = no update, 1 = update.
+ * @acc_yds: 0 = no update, 1 = update.
+ * @acc_chnr: 0 = no update, 1 = update.
+ * @acc_ytm: 0 = no update, 1 = update.
+ * @acc_yds2: 0 = no update, 1 = update.
+ * @acc_tcc: 0 = no update, 1 = update.
+ * @acc_dpc: 0 = no update, 1 = update.
+ * @acc_bds: 0 = no update, 1 = update.
+ * @acc_anr: 0 = no update, 1 = update.
+ * @acc_awb_fr: 0 = no update, 1 = update.
+ * @acc_ae: 0 = no update, 1 = update.
+ * @acc_af: 0 = no update, 1 = update.
+ * @acc_awb: 0 = no update, 1 = update.
+ * @__acc_osys: 0 = no update, 1 = update.
+ * @__reserved3: Not used.
+ * @lin_vmem_params: 0 = no update, 1 = update.
+ * @tnr3_vmem_params: 0 = no update, 1 = update.
+ * @xnr3_vmem_params: 0 = no update, 1 = update.
+ * @tnr3_dmem_params: 0 = no update, 1 = update.
+ * @xnr3_dmem_params: 0 = no update, 1 = update.
+ * @__reserved4: Not used.
+ * @obgrid_param: 0 = no update, 1 = update.
+ * @__reserved5: Not used.
+ */
+struct ipu3_uapi_flags {
+	__u32 gdc:1;
+	__u32 obgrid:1;
+	__u32 __reserved1:32;
+
+	__u32 acc_bnr:1;
+	__u32 acc_green_disparity:1;
+	__u32 acc_dm:1;
+	__u32 acc_ccm:1;
+	__u32 acc_gamma:1;
+	__u32 acc_csc:1;
+	__u32 acc_cds:1;
+	__u32 acc_shd:1;
+	__u32 __reserved2:2;
+	__u32 acc_iefd:1;
+	__u32 acc_yds_c0:1;
+	__u32 acc_chnr_c0:1;
+	__u32 acc_y_ee_nr:1;
+	__u32 acc_yds:1;
+	__u32 acc_chnr:1;
+	__u32 acc_ytm:1;
+	__u32 acc_yds2:1;
+	__u32 acc_tcc:1;
+	__u32 acc_dpc:1;
+	__u32 acc_bds:1;
+	__u32 acc_anr:1;
+	__u32 acc_awb_fr:1;
+	__u32 acc_ae:1;
+	__u32 acc_af:1;
+	__u32 acc_awb:1;
+	__u32 __reserved3:4;
+
+	__u32 lin_vmem_params:1;
+	__u32 tnr3_vmem_params:1;
+	__u32 xnr3_vmem_params:1;
+	__u32 tnr3_dmem_params:1;
+	__u32 xnr3_dmem_params:1;
+	__u32 __reserved4:1;
+	__u32 obgrid_param:1;
+	__u32 __reserved5:25;
+} __packed;
+
+/**
+ * struct ipu3_uapi_params - V4L2_META_FMT_IPU3_PARAMS
+ *
+ * @use:	select which parameters to apply, see &ipu3_uapi_flags
+ * @acc_param:	ACC parameters, as specified by &ipu3_uapi_acc_param
+ * @lin_vmem_params:	linearization VMEM, as specified by
+ *			&ipu3_uapi_isp_lin_vmem_params
+ * @tnr3_vmem_params:	tnr3 VMEM as specified by
+ *			&ipu3_uapi_isp_tnr3_vmem_params
+ * @xnr3_vmem_params:	xnr3 VMEM as specified by
+ *			&ipu3_uapi_isp_xnr3_vmem_params
+ * @tnr3_dmem_params:	tnr3 DMEM as specified by &ipu3_uapi_isp_tnr3_params
+ * @xnr3_dmem_params:	xnr3 DMEM as specified by &ipu3_uapi_isp_xnr3_params
+ * @obgrid_param:	obgrid parameters as specified by
+ *			&ipu3_uapi_obgrid_param
+ *
+ * The video queue "parameters" is of format V4L2_META_FMT_IPU3_PARAMS.
+ * This is a "single plane" v4l2_meta_format using V4L2_BUF_TYPE_META_OUTPUT.
+ *
+ * struct ipu3_uapi_params as defined below contains a lot of parameters and
+ * ipu3_uapi_flags selects which parameters to apply.
+ */
+struct ipu3_uapi_params {
+	/* Flags which of the settings below are to be applied */
+	IPU3_ALIGN struct ipu3_uapi_flags use;
+
+	/* Accelerator cluster parameters */
+	struct ipu3_uapi_acc_param acc_param;
+
+	/* ISP vector address space parameters */
+	struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
+	struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
+	struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
+
+	/* ISP data memory (DMEM) parameters */
+	struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
+	struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
+
+	/* Optical black level compensation */
+	struct ipu3_uapi_obgrid_param obgrid_param;
+} __packed;
+
+#endif
-- 
2.7.4

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 818 bytes --]

Hi Yong,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17 next-20180614]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Yong-Zhi/doc-rst-Add-Intel-IPU3-documentation/20180615-113101
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> ./usr/include/linux/intel-ipu3.h:7: included file 'linux/bitmap.h' is not exported

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 6368 bytes --]

Re: [PATCH v1 1/2] doc-rst: Add Intel IPU3 documentation

[Sakari Ailus]

Hi Yong,

On Thu, Jun 14, 2018 at 10:29:32PM -0500, Yong Zhi wrote:
> From: Rajmohan Mani <rajmohan.mani@intel.com>
> 
> This patch adds the details about the IPU3 Imaging Unit driver.
> 
> Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> Signed-off-by: Tian Shu Qiu <tian.shu.qiu@intel.com>
> ---
>  Documentation/media/v4l-drivers/index.rst |   1 +
>  Documentation/media/v4l-drivers/ipu3.rst  | 304 ++++++++++++++++++++++++++++++
>  2 files changed, 305 insertions(+)
>  create mode 100644 Documentation/media/v4l-drivers/ipu3.rst
> 
> diff --git a/Documentation/media/v4l-drivers/index.rst b/Documentation/media/v4l-drivers/index.rst
> index 679238e..179a393 100644
> --- a/Documentation/media/v4l-drivers/index.rst
> +++ b/Documentation/media/v4l-drivers/index.rst
> @@ -44,6 +44,7 @@ For more details see the file COPYING in the source distribution of Linux.
>  	davinci-vpbe
>  	fimc
>  	imx
> +	ipu3
>  	ivtv
>  	max2175
>  	meye
> diff --git a/Documentation/media/v4l-drivers/ipu3.rst b/Documentation/media/v4l-drivers/ipu3.rst
> new file mode 100644
> index 0000000..a4550d8
> --- /dev/null
> +++ b/Documentation/media/v4l-drivers/ipu3.rst
> @@ -0,0 +1,304 @@
> +.. include:: <isonum.txt>
> +
> +===============================================================
> +Intel Image Processing Unit 3 (IPU3) Imaging Unit (ImgU) driver
> +===============================================================
> +
> +Copyright |copy| 2018 Intel Corporation
> +
> +Introduction
> +============
> +
> +This file documents Intel IPU3 (3rd generation Image Processing Unit) Imaging
> +Unit driver located under drivers/media/pci/intel/ipu3.
> +
> +The Intel IPU3 found in certain Kaby Lake (as well as certain Sky Lake)
> +platforms (U/Y processor lines) is made up of two parts namely Imaging Unit
> +(ImgU) and CIO2 device (MIPI CSI2 receiver).
> +
> +The CIO2 device receives the raw bayer data from the sensors and outputs the
> +frames in a format that is specific to IPU3 (for consumption by IPU3 ImgU).
> +CIO2 driver is available as drivers/media/pci/intel/ipu3/ipu3-cio2* and is
> +enabled through the CONFIG_VIDEO_IPU3_CIO2 config option.
> +
> +The Imaging Unit (ImgU) is responsible for processing images captured
> +through IPU3 CIO2 device. The ImgU driver sources can be found under
> +drivers/media/pci/intel/ipu3 directory. The driver is enabled through the
> +CONFIG_VIDEO_IPU3_IMGU config option.
> +
> +The two driver modules are named ipu3-csi2 and ipu3-imgu, respectively.
> +
> +The driver has been tested on Kaby Lake platforms (U/Y processor lines).
> +
> +The driver implements V4L2, Media controller and V4L2 sub-device interfaces.
> +Camera sensors that have CSI-2 bus, which are connected to the IPU3 CIO2
> +device are supported. Support for lens and flash drivers depends on the
> +above sensors.
> +
> +ImgU device nodes
> +=================
> +
> +The ImgU is represented as a single V4L2 subdev, which provides a V4L2 subdev
> +interface to the user space.
> +
> +CIO2 device
> +===========
> +
> +The CIO2 is represented as a single V4L2 subdev, which provides a V4L2 subdev
> +interface to the user space. There is a video node for each CSI-2 receiver,
> +with a single media controller interface for the entire device.
> +
> +Media controller
> +----------------
> +
> +The media device interface allows to configure the ImgU links, which defines
> +the behavior of the IPU3 firmware. The link configuration tells the firmware
> +whether viewfinder or postview ISP pipeline should be enabled.
> +
> +Device operation
> +----------------
> +
> +With IPU3, once the input video node ("ipu3-imgu":0, in <entity>:<pad-number>
> +format) is queued with buffer (in packed raw bayer format), IPU3 ISP starts
> +processing the buffer and produces the video output in YUV format and
> +statistics output on respective output nodes. The driver is expected to have
> +buffers ready for all of parameter, output and statistics nodes, when input
> +video node is queued with buffer.
> +
> +At a minimum, all of input, main output, 3A statistics, and either of
> +viewfinder or postview video nodes should be enabled for IPU3 to start image
> +processing. viewfinder and postview video nodes are mutually exclusive.
> +
> +input, output, viewfinder and postview video nodes
> +--------------------------------------------------
> +
> +The frames (in packed raw bayer format specific to IPU3) received by the
> +input video node is processed by the IPU3 Imaging Unit and is output to 2
> +video nodes, with each targeting different purpose (main output and viewfinder
> +or postview output).
> +
> +Details on raw bayer format specific to IPU3 can be found as below.
> +Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> +
> +The driver supports V4L2 Video Capture Interface as defined at :ref:`devices`.
> +
> +Only the multi-planar API is supported. More details can be found at
> +:ref:`planar-apis`.
> +
> +
> +parameters video node
> +---------------------
> +
> +The parameter video node receives the ISP algorithm parameters that are used
> +to configure how the ISP algorithms process the image.
> +
> +Details on raw bayer format specific to IPU3 can be found as below.
> +Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> +
> +3A statistics video node
> +------------------------
> +
> +3A statistics video node is used by the ImgU driver to output the 3A (auto
> +focus, auto exposure and auto white balance) statistics for the frames that
> +are being processed by the ISP to user space applications. User space
> +applications can use this statistics data to arrive at desired algorithm
> +parameters for ISP.
> +
> +CIO2 device nodes
> +=================
> +
> +CIO2 is represented as a single V4L2 sub-device with a video node for each
> +CSI-2 receiver. The video node represents the DMA engine.
> +
> +Configuring the Intel IPU3
> +==========================
> +
> +The Intel IPU3 ImgU driver supports V4L2 interface. Using V4L2 ioctl calls,
> +the ISP can be configured and enabled.
> +
> +The IPU3 ImgU pipelines can be configured using media controller APIs,
> +defined at :ref:`media_controller`.
> +
> +Capturing frames in raw bayer format
> +------------------------------------
> +
> +IPU3 MIPI CSI2 receiver is used to capture frames (in packed raw bayer
> +format) from the raw sensors connected to the CSI2 ports. The captured
> +frames are used as input to the ImgU driver.
> +
> +Image processing using IPU3 ImgU requires tools such as v4l2n [#f1]_,
> +raw2pnm [#f1]_, and yavta [#f2]_ due to the following unique requirements
> +and / or features specific to IPU3.
> +
> +-- The IPU3 CSI2 receiver outputs the captured frames from the sensor in
> +packed raw bayer format that is specific to IPU3
> +
> +-- Multiple video nodes have to be operated simultaneously
> +
> +Let us take the example of ov5670 sensor connected to CSI2 port 0, for a
> +2592x1944 image capture.
> +
> +Using the media contorller APIs, the ov5670 sensor is configured to send
> +frames in packed raw bayer format to IPU3 CSI2 receiver.
> +
> +# This example assumes /dev/media0 as the ImgU media device
> +
> +export MDEV=/dev/media0
> +
> +# and that ov5670 sensor is connected to i2c bus 10 with address 0x36
> +
> +export SDEV="ov5670 10-0036"
> +
> +# Establish the link for the media devices using media-ctl [#f3]_
> +media-ctl -d $MDEV -l "ov5670 ":0 -> "ipu3-csi2 0":0[1]
> +
> +media-ctl -d $MDEV -l "ipu3-csi2 0":1 -> "ipu3-cio2 0":0[1]
> +
> +# Set the format for the media devices
> +media-ctl -d $MDEV -V "ov5670 ":0 [fmt:SGRBG10/2592x1944]
> +
> +media-ctl -d $MDEV -V "ipu3-csi2 0":0 [fmt:SGRBG10/2592x1944]
> +
> +media-ctl -d $MDEV -V "ipu3-csi2 0":1 [fmt:SGRBG10/2592x1944]
> +
> +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
> +
> +yavta -w 0x009e0903 444 $(media-ctl -d $MDEV -e "$SDEV")
> +
> +yavta -w 0x009e0913 1024 $(media-ctl -d $MDEV -e "$SDEV")
> +
> +yavta -w 0x009e0911 2046 $(media-ctl -d $MDEV -e "$SDEV")
> +
> +Once the desired sensor settings are set, frame captures can be done as below.
> +
> +e.g
> +
> +yavta --data-prefix -u -c10 -n5 -I -s2592x1944 --file=/tmp/frame-#.bin
> +-f IPU3_GRBG10 media-ctl -d $MDEV -e ipu3-cio2 0
> +
> +With the above command, 10 frames are captured at 2592x1944 resolution, with
> +sGRBG10 format and output as IPU3_GRBG10 format.
> +
> +The captured frames are available as /tmp/frame-#.bin files.
> +
> +Processing the image in raw bayer format
> +----------------------------------------
> +
> +Configuring ImgU V4L2 subdev for image processing
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +The ImgU V4L2 subdev has to be configured with media controller APIs to
> +have all the video nodes setup correctly.
> +
> +media-ctl -d $MDEV -l "ipu3-imgu":2 -> "output":0[1]
> +
> +media-ctl -d $MDEV -l "ipu3-imgu":3 -> "viewfinder":0[0]
> +
> +media-ctl -d $MDEV -l "ipu3-imgu":4 -> "postview":0[1]
> +
> +media-ctl -d $MDEV -l "ipu3-imgu":5 -> "3a stat":0[1]
> +
> +In this particular example, postview node is enabled.
> +
> +RAW bayer frames go through the following ISP pipeline HW blocks to
> +have the processed image output to the DDR memory.
> +
> +RAW bayer frame -> Input Feeder -> Bayer Down Scaling (BDS) -> Geometric
> +Distortion Correction (GDC) -> DDR
> +
> +The ImgU V4L2 subdev has to be configured with the supported resolutions
> +in all the above HW blocks, for a given input resolution.
> +
> +For a given supported resolution for an input frame, the Input Feeder,
> +Bayer Down Scaling and GDC blocks should be configured with the supported
> +resolutions. This information can be obtained by looking at the following
> +IPU3 ISP configuration table.
> +
> +https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/master
> +
> +Under baseboard-poppy/media-libs/arc-camera3-hal-configs-poppy/files/gcss
> +directory, graph_settings_ov5670.xml can be used as an example.
> +
> +The following steps prepare the ImgU ISP pipeline for the image processing.
> +
> +1. The ImgU V4L2 subdev data format should be set by using the
> +VIDIOC_SUBDEV_S_FMT on pad 0, using the GDC width and height obtained above.
> +
> +2. The ImgU V4L2 subdev cropping should be set by using the
> +VIDIOC_SUBDEV_S_SELECTION on pad 0, with V4L2_SEL_TGT_CROP as the target,
> +using the input feeder height and width.
> +
> +3. The ImgU V4L2 subdev composing should be set by using the
> +VIDIOC_SUBDEV_S_SELECTION on pad 0, with V4L2_SEL_TGT_COMPOSE as the target,
> +using the BDS height and width.
> +
> +For the ov5670 example, for an input frame with a resolution of 2592x1944
> +(which is input to the ImgU subdev pad 0), the corresponding resolutions
> +for input feeder, BDS and GDC are 2592x1944, 2592x1944 and 2560x1920
> +respectively.
> +
> +Once this is done, the received raw bayer frames can be input to the ImgU
> +V4L2 subdev as below, using the open source application v4l2n.
> +
> +For an image captured with 2592x1944 [#f4]_ resolution, with desired output
> +resolution as 2560x1920 and viewfinder resolution as 2560x1920, the following
> +v4l2n command can be used. This helps process the raw bayer frames and
> +produces the desired results for the main output image and the viewfinder
> +output, in NV12 format.
> +
> +v4l2n --pipe=4 --load=/tmp/frame-#.bin --open=$MDEV
> +--fmt=type:VIDEO_OUTPUT_MPLANE,width=2592,height=1944,pixelformat=0X47337069
> +--reqbufs=type:VIDEO_OUTPUT_MPLANE,count:1 --pipe=1 --output=/tmp/frames.out
> +--open= --fmt=type:VIDEO_CAPTURE_MPLANE,width=2560,height=1920,pixelformat=NV12
> +--reqbufs=type:VIDEO_CAPTURE_MPLANE,count:1 --pipe=2 --output=/tmp/frames.vf
> +--open= --fmt=type:VIDEO_CAPTURE_MPLANE,width=2560,height=1920,pixelformat=NV12
> +--reqbufs=type:VIDEO_CAPTURE_MPLANE,count:1 --pipe=3 --open=
> +--output=/tmp/frames.3A --fmt=type:META_CAPTURE,?
> +--reqbufs=count:1,type:META_CAPTURE --pipe=1,2,3,4 --stream=5

You could drop the directories from the file names, i.e. use the current
directory.

> +
> +Converting the raw bayer image into YUV domain
> +----------------------------------------------
> +
> +The processed images after the above step, can be converted to YUV domain
> +as below.
> +
> +Main output frames
> +~~~~~~~~~~~~~~~~~~
> +
> +raw2pnm -x2560 -y1920 -fNV12 /tmp/frames.out /tmp/frames.out.pnm
> +
> +where 2560x1920 is output resolution, NV12 is the video format, followed
> +by input frame and output PNM file.
> +
> +Viewfinder output frames
> +~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +raw2pnm -x2560 -y1920 -fNV12 /tmp/frames.vf /tmp/frames.vf.pnm
> +
> +where 2560x1920 is output resolution, NV12 is the video format, followed
> +by input frame and output PNM file.
> +
> +Example user space code for IPU3
> +================================
> +
> +User space code that configures and uses IPU3 is available here.
> +
> +https://chromium.googlesource.com/chromiumos/platform/arc-camera/+/master/

You could put this as a reference as well.

> +
> +The source can be located under hal/intel directory.
> +
> +References
> +==========
> +
> +include/uapi/linux/intel-ipu3.h
> +
> +.. [#f1] https://github.com/intel/nvt
> +
> +.. [#f2] http://git.ideasonboard.org/yavta.git
> +
> +.. [#f3] http://git.ideasonboard.org/?p=media-ctl.git;a=summary
> +
> +.. [#f4] ImgU limitation requires an additional 16x16 for all input resolutions

This isn't a reference; just put it where you have [#f4] now.

-- 
Sakari Ailus
sakari.ailus@linux.intel.com

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Tomasz Figa]

Hi Mauro, Hans,

On Fri, Jun 15, 2018 at 12:30 PM Yong Zhi <yong.zhi@intel.com> wrote:
>
> These meta formats are used on Intel IPU3 ImgU video queues
> to carry 3A statistics and ISP pipeline parameters.
>
> V4L2_META_FMT_IPU3_3A
> V4L2_META_FMT_IPU3_PARAMS
>
> Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> Signed-off-by: Chao C Li <chao.c.li@intel.com>
> Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> ---
>  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
>  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
>  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++

The documentation seems to be quite extensive in current version. Do
you think it's more acceptable now? Would you be able to take a look?

We obviously need to keep working on the user space framework (and
we're in process of figuring out how we can proceed further), but
having the driver bit-rotting downstream might not be a very
encouraging factor. ;)

Best regards,
Tomasz

RE: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mani, Rajmohan]

Hi Mauro, Hans,

> -----Original Message-----
> From: Tomasz Figa [mailto:tfiga@chromium.org]
> Sent: Wednesday, July 18, 2018 7:53 AM
> To: Hans Verkuil <hans.verkuil@cisco.com>; Mauro Carvalho Chehab
> <mchehab@kernel.org>
> Cc: Zhi, Yong <yong.zhi@intel.com>; Sakari Ailus
> <sakari.ailus@linux.intel.com>; Linux Media Mailing List <linux-
> media@vger.kernel.org>; Laurent Pinchart
> <laurent.pinchart@ideasonboard.com>; Mani, Rajmohan
> <rajmohan.mani@intel.com>; Zheng, Jian Xu <jian.xu.zheng@intel.com>; Hu,
> Jerry W <jerry.w.hu@intel.com>; Li, Chao C <chao.c.li@intel.com>; Qiu, Tian
> Shu <tian.shu.qiu@intel.com>
> Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> 
> Hi Mauro, Hans,
> 
> On Fri, Jun 15, 2018 at 12:30 PM Yong Zhi <yong.zhi@intel.com> wrote:
> >
> > These meta formats are used on Intel IPU3 ImgU video queues to carry
> > 3A statistics and ISP pipeline parameters.
> >
> > V4L2_META_FMT_IPU3_3A
> > V4L2_META_FMT_IPU3_PARAMS
> >
> > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > ---
> >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> >  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
> 
> The documentation seems to be quite extensive in current version. Do you
> think it's more acceptable now? Would you be able to take a look?

Hope you had a chance to look into this current version of IPU3 documentation.
Please share your thoughts.

Thanks
Raj

> 
> We obviously need to keep working on the user space framework (and we're in
> process of figuring out how we can proceed further), but having the driver bit-
> rotting downstream might not be a very encouraging factor. ;)
> 
> Best regards,
> Tomasz

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Hans Verkuil]

On 15/06/18 05:29, Yong Zhi wrote:
> These meta formats are used on Intel IPU3 ImgU video queues
> to carry 3A statistics and ISP pipeline parameters.
> 
> V4L2_META_FMT_IPU3_3A
> V4L2_META_FMT_IPU3_PARAMS
> 
> Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> Signed-off-by: Chao C Li <chao.c.li@intel.com>
> Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> ---
>  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
>  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
>  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
>  3 files changed, 2991 insertions(+)
>  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
>  create mode 100644 include/uapi/linux/intel-ipu3.h
> 
> diff --git a/Documentation/media/uapi/v4l/meta-formats.rst b/Documentation/media/uapi/v4l/meta-formats.rst
> index 0c4e1ec..b887fca 100644
> --- a/Documentation/media/uapi/v4l/meta-formats.rst
> +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata` interface only.
>  .. toctree::
>      :maxdepth: 1
>  
> +    pixfmt-meta-intel-ipu3
>      pixfmt-meta-uvc
>      pixfmt-meta-vsp1-hgo
>      pixfmt-meta-vsp1-hgt
> diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> new file mode 100644
> index 0000000..5c050e6
> --- /dev/null
> +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> @@ -0,0 +1,174 @@
> +.. -*- coding: utf-8; mode: rst -*-
> +
> +.. _intel-ipu3:
> +
> +******************************************************************
> +V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A ('ip3s')
> +******************************************************************
> +
> +.. c:type:: ipu3_uapi_stats_3a
> +
> +3A statistics
> +=============
> +
> +For IPU3 ImgU, the 3A statistics accelerators collect different statistics over
> +an input bayer frame. Those statistics, defined in data struct
> +:c:type:`ipu3_uapi_stats_3a`, are meta output obtained from "ipu3-imgu 3a stat"
> +video node, which are then passed to user space for statistics analysis
> +using :c:type:`v4l2_meta_format` interface.
> +
> +The statistics collected are AWB (Auto-white balance) RGBS cells, AWB filter
> +response, AF (Auto-focus) filter response, and AE (Auto-exposure) histogram.
> +
> +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for all above.
> +
> +
> +.. code-block:: c
> +
> +
> +     struct ipu3_uapi_stats_3a {
> +	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;

IPU3_ALIGN? What's that?

OK, after reading the header I see what it does, but I think you should
drop it in the documentation since it doesn't help the reader.

> +	struct ipu3_uapi_ae_raw_buffer_aligned
> +			ae_raw_buffer[IPU3_UAPI_MAX_STRIPES];
> +	struct ipu3_uapi_af_raw_buffer af_raw_buffer;
> +	struct ipu3_uapi_awb_fr_raw_buffer awb_fr_raw_buffer;
> +	struct ipu3_uapi_4a_config stats_4a_config;
> +	__u32 ae_join_buffers;
> +	__u8 padding[28];
> +	struct ipu3_uapi_stats_3a_bubble_info_per_stripe
> +			stats_3a_bubble_per_stripe;
> +	struct ipu3_uapi_ff_status stats_3a_status;
> +     } __packed;
> +
> +
> +.. c:type:: ipu3_uapi_params
> +
> +Pipeline parameters
> +===================
> +
> +IPU3 pipeline has a number of image processing stages, each of which takes a
> +set of parameters as input. The major stages of pipelines are shown here:
> +
> +Raw pixels -> Bayer Downscaling -> Optical Black Correction ->
> +
> +Linearization -> Lens Shading Correction -> White Balance / Exposure /
> +
> +Focus Apply -> Bayer Noise Reduction -> ANR -> Demosaicing -> Color
> +
> +Correction Matrix -> Gamma correction -> Color Space Conversion ->
> +
> +Chroma Down Scaling -> Chromatic Noise Reduction -> Total Color
> +
> +Correction -> XNR3 -> TNR -> DDR
> +
> +The table below presents a description of the above algorithms.
> +
> +======================== =======================================================
> +Name			 Description
> +======================== =======================================================
> +Optical Black Correction Optical Black Correction block subtracts a pre-defined
> +			 value from the respective pixel values to obtain better
> +			 image quality.
> +			 Defined in :c:type:`ipu3_uapi_obgrid_param`.
> +Linearization		 This algo block uses linearization parameters to
> +			 address non-linearity sensor effects. The Lookup table
> +			 table is defined in
> +			 :c:type:`ipu3_uapi_isp_lin_vmem_params`.
> +SHD			 Lens shading correction is used to correct spatial
> +			 non-uniformity of the pixel response due to optical
> +			 lens shading. This is done by applying a different gain
> +			 for each pixel. The gain, black level etc are
> +			 configured in :c:type:`ipu3_uapi_shd_config_static`.
> +BNR			 Bayer noise reduction block removes image noise by
> +			 applying a bilateral filter.
> +			 See :c:type:`ipu3_uapi_bnr_static_config` for details.
> +ANR			 Advanced Noise Reduction is a block based algorithm
> +			 that performs noise reduction in the Bayer domain. The
> +			 convolution matrix etc can be found in
> +			 :c:type:`ipu3_uapi_anr_config`.
> +Demosaicing		 Demosaicing converts raw sensor data in Bayer format
> +			 into RGB (Red, Green, Blue) presentation. Then add
> +			 outputs of estimation of Y channel for following stream
> +			 processing by Firmware. The struct is defined as
> +			 :c:type:`ipu3_uapi_dm_config`.
> +Color Correction	 Color Correction algo transforms sensor specific color
> +			 space to the standard "sRGB" color space. This is done
> +			 by applying 3x3 matrix defined in
> +			 :c:type:`ipu3_uapi_ccm_mat_config`.
> +Gamma correction	 Gamma correction :c:type:`ipu3_uapi_gamma_config` is a
> +			 basic non-linear tone mapping correction that is
> +			 applied per pixel for each pixel component.
> +CSC			 Color space conversion transforms each pixel from the
> +			 RGB primary presentation to YUV (Y - brightness,
> +			 UV - Luminance) presentation. This is done by applying
> +			 a 3x3 matrix defined in
> +			 :c:type:`ipu3_uapi_csc_mat_config`
> +CDS			 Chroma down sampling
> +			 After the CSC is performed, the Chroma Down Sampling
> +			 is applied for a UV plane down sampling by a factor
> +			 of 2 in each direction for YUV 4:2:0 using a 4x2
> +			 configurable filter :c:type:`ipu3_uapi_cds_params`.
> +CHNR			 Chroma noise reduction
> +			 This block processes only the chrominance pixels and
> +			 performs noise reduction by cleaning the high
> +			 frequency noise.
> +			 See struct :c:type:`ipu3_uapi_yuvp1_chnr_config`.
> +TCC			 Total color correction as defined in struct
> +			 :c:type:`ipu3_uapi_yuvp2_tcc_static_config`.
> +XNR3			 eXtreme Noise Reduction V3 is the third revision of
> +			 noise reduction algorithm used to improve image
> +			 quality. This removes the low frequency noise in the
> +			 captured image. Two related structs are  being defined,
> +			 :c:type:`ipu3_uapi_isp_xnr3_params` for ISP data memory
> +			 and :c:type:`ipu3_uapi_isp_xnr3_vmem_params` for vector
> +			 memory.
> +TNR			 Temporal Noise Reduction block compares successive
> +			 frames in time to remove anamolies / noise in pixel

anamolies -> anomalies

> +			 values. :c:type:`ipu3_uapi_isp_tnr3_vmem_params` and
> +			 :c:type:`ipu3_uapi_isp_tnr3_params` are defined for ISP
> +			 vector and data memory respectively.

Nice overview of all the blocks!

> +======================== =======================================================> +
> +A few stages of the pipe will be executed by firmware running on the ISP

pipe -> pipeline

> +processor, while many others will use a set of fixed hardware blocks also
> +called accelerator cluster (ACC) to crunch pixel data and produce statistics.
> +
> +ACC parameters as defined by :c:type:`ipu3_uapi_acc_param`, can be selectively
> +enabled / disabled by the user space through struct :c:type:`ipu3_uapi_flags`
> +embedded in :c:type:`ipu3_uapi_params` structure.
> +
> +Both 3A statistics and pipeline parameters described here are closely tied to
> +the underlying camera sub-system (CSS) APIs. They are usually consumed and
> +produced by dedicated user space libraries that comprise the important tuning
> +tools, thus freeing the developers from being bothered with the low level
> +hardware and algorithm details.
> +
> +The meta data :c:type:`ipu3_uapi_params` will be sent to "ipu3-imgu parameters"
> +video node in ``V4L2_BUF_TYPE_META_CAPTURE`` format.
> +
> +.. code-block:: c
> +
> +    struct ipu3_uapi_params {
> +	/* Flags which of the settings below are to be applied */
> +	IPU3_ALIGN struct ipu3_uapi_flags use;
> +
> +	/* Accelerator cluster parameters */
> +	struct ipu3_uapi_acc_param acc_param;
> +
> +	/* ISP vector parameters */
> +	struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
> +	struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
> +	struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
> +
> +	/* ISP data memory parameters */
> +	struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
> +	struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
> +
> +	/* Optical black level compensation */
> +	struct ipu3_uapi_obgrid_param obgrid_param;
> +    } __packed;
> +
> +Intel IPU3 ImgU uAPI data types
> +===============================
> +
> +.. kernel-doc:: include/uapi/linux/intel-ipu3.h
> diff --git a/include/uapi/linux/intel-ipu3.h b/include/uapi/linux/intel-ipu3.h
> new file mode 100644
> index 0000000..644c83f
> --- /dev/null
> +++ b/include/uapi/linux/intel-ipu3.h
> @@ -0,0 +1,2816 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (C) 2017 - 2018 Intel Corporation */
> +
> +#ifndef __IPU3_UAPI_H
> +#define __IPU3_UAPI_H
> +
> +#include <linux/bitmap.h>
> +#include <linux/types.h>
> +
> +/********************* Key Acronyms *************************/
> +/*
> + * ACC - Accelerator cluster
> + * ANR - Adaptive noise reduction
> + * AWB_FR- Auto white balance filter response statistics
> + * BNR - Bayer noise reduction parameters
> + * BDS - Bayer downscaler parameters
> + * CCM - Color correction matrix coefficients
> + * CDS - Chroma down sample
> + * CHNR - Chroma noise reduction
> + * CSC - Color space conversion
> + * DM - De-mosaic
> + * IEFd - Image enhancement filter directed
> + * Obgrid - Optical black level compensation
> + * OSYS - Output system configuration
> + * ROI - Region of interest
> + * SHD - Lens shading correction table
> + * TCC - Total color correction
> + * YDS - Y down sampling
> + * YTM - Y-tone mapping
> + */
> +
> +#define IPU3_UAPI_ISP_WORD_BYTES			32
> +#define IMGU_ABI_PAD	__aligned(IPU3_UAPI_ISP_WORD_BYTES)
> +#define IPU3_ALIGN	__attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))

That's weird. Isn't __aligned identical to __attribute__((aligned( ?
If so, then these last two defines are also identical.

Why is it aligned to a 32 bytes? Is it a hardware requirement?

> +
> +/******************* ipu3_uapi_stats_3a *******************/
> +
> +#define IPU3_UAPI_MAX_STRIPES				2
> +#define IPU3_UAPI_MAX_BUBBLE_SIZE			10
> +
> +#define IPU3_UAPI_GRID_START_MASK			(BIT(12) - 1)
> +#define IPU3_UAPI_GRID_Y_START_EN			BIT(15)
> +
> +/* controls generation of meta_data (like FF enable/disable) */
> +#define IPU3_UAPI_AWB_RGBS_THR_B_EN			BIT(14)
> +#define IPU3_UAPI_AWB_RGBS_THR_B_INCL_SAT		BIT(15)
> +
> +/**
> + * struct ipu3_uapi_grid_config - Grid plane config
> + *
> + * @width:	Grid horizontal dimensions, in number of grid blocks(cells).
> + * @height:	Grid vertical dimensions, in number of grid cells.
> + * @block_width_log2:	Log2 of the width of each cell in pixels.
> + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
> + * @block_height_log2:	Log2 of the height of each cell in pixels.
> + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
> + * @height_per_slice:	The number of blocks in vertical axis per slice.
> + *			Default 2.
> + * @x_start: X value of top left corner of Region of Interest(ROI).
> + * @y_start: Y value of top left corner of ROI
> + * @x_end: X value of bottom right corner of ROI
> + * @y_end: Y value of bottom right corner of ROI
> + *
> + * Due to the size of total amount of collected data, most statistics
> + * create a grid-based output, and the data is then divided into "slices".
> + */
> +struct ipu3_uapi_grid_config {
> +	__u8 width;
> +	__u8 height;
> +	__u16 block_width_log2:3;
> +	__u16 block_height_log2:3;
> +	__u16 height_per_slice:8;
> +	__u16 x_start;
> +	__u16 y_start;
> +	__u16 x_end;
> +	__u16 y_end;
> +} __packed;
> +
> +/*
> + * The grid based data is divided into "slices" called set, each slice of setX
> + * refers to ipu3_uapi_grid_config width * height_per_slice.
> + */
> +#define IPU3_UAPI_AWB_MAX_SETS				60
> +#define IPU3_UAPI_AWB_SET_SIZE				0x500
> +#define IPU3_UAPI_AWB_MD_ITEM_SIZE			8
> +#define IPU3_UAPI_AWB_SPARE_FOR_BUBBLES \
> +	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
> +	 IPU3_UAPI_AWB_MD_ITEM_SIZE)
> +#define IPU3_UAPI_AWB_MAX_BUFFER_SIZE \
> +	(IPU3_UAPI_AWB_MAX_SETS * \
> +	 (IPU3_UAPI_AWB_SET_SIZE + IPU3_UAPI_AWB_SPARE_FOR_BUBBLES))
> +/**
> + * struct ipu3_uapi_awb_meta_data - AWB meta data
> + *
> + * @meta_data_buffer:	Average values for each color channel
> + */
> +struct ipu3_uapi_awb_meta_data {
> +	__u8 meta_data_buffer[IPU3_UAPI_AWB_MAX_BUFFER_SIZE];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_awb_raw_buffer - AWB raw buffer
> + *
> + * @meta_data: buffer to hold auto white balance meta data.
> + */
> +struct ipu3_uapi_awb_raw_buffer {
> +	struct ipu3_uapi_awb_meta_data meta_data;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_awb_config_s - AWB config
> + *
> + * @rgbs_thr_gr: gr threshold value.
> + * @rgbs_thr_r: Red threshold value.
> + * @rgbs_thr_gb: gb threshold value.
> + * @rgbs_thr_b: Blue threshold value.
> + * @grid: &ipu3_uapi_grid_config, the default grid resolution is 16x16 cells.
> + *
> + * The threshold is a saturation measure range [0..8191], 8191 is default.
> + * Values over threshold may be optionally rejected for averaging.
> + */
> +struct ipu3_uapi_awb_config_s {
> +	__u16 rgbs_thr_gr;
> +	__u16 rgbs_thr_r;
> +	__u16 rgbs_thr_gb;
> +	__u16 rgbs_thr_b;
> +	struct ipu3_uapi_grid_config grid;
> +} IPU3_ALIGN __packed;
> +
> +/**
> + * struct ipu3_uapi_awb_config - AWB config wrapper
> + *
> + * @config: config for auto white balance as defined by &ipu3_uapi_awb_config_s
> + */
> +struct ipu3_uapi_awb_config {
> +	IPU3_ALIGN struct ipu3_uapi_awb_config_s config;
> +} __packed;
> +
> +#define IPU3_UAPI_AE_COLORS				4	/* R, G, B, Y */
> +#define IPU3_UAPI_AE_BINS				256
> +#define IPU3_UAPI_AE_WEIGHTS				96
> +
> +/**
> + * struct ipu3_uapi_ae_raw_buffer - AE global weighted histogram
> + *
> + * @vals: Sum of IPU3_UAPI_AE_COLORS in cell
> + *
> + * Each histogram contains IPU3_UAPI_AE_BINS bins. Each bin has 24 bit unsigned
> + * for counting the number of the pixel.
> + */
> +struct ipu3_uapi_ae_raw_buffer {
> +	__u32 vals[IPU3_UAPI_AE_BINS * IPU3_UAPI_AE_COLORS];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_ae_raw_buffer_aligned - AE raw buffer
> + *
> + * @buff: &ipu3_uapi_ae_raw_buffer to hold full frame meta data.
> + */
> +struct ipu3_uapi_ae_raw_buffer_aligned {
> +	IPU3_ALIGN struct ipu3_uapi_ae_raw_buffer buff;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_ae_grid_config - AE weight grid
> + *
> + * @width: Grid horizontal dimensions. Value: [16,32], default 16.
> + * @height: Grid vertical dimensions. Value: [16,24], default 16.
> + * @block_width_log2: Log2 of the width of the grid cell, 2^3 = 16.
> + * @block_height_log2: Log2 of the height of the grid cell, 2^3 = 16.
> + * @__reserved0: reserved
> + * @ae_en: 0: does not write to meta-data array, 1: write normally.
> + * @rst_hist_array: write 1 to trigger histogram array reset.
> + * @done_rst_hist_array: flag for histogram array reset done.
> + * @x_start: X value of top left corner of ROI, default 0.
> + * @y_start: Y value of top left corner of ROI, default 0.
> + * @x_end: X value of bottom right corner of ROI
> + * @y_end: Y value of bottom right corner of ROI
> + *
> + * The AE block accumulates 4 global weighted histograms(R, G, B, Y) over
> + * a defined ROI within the frame. The contribution of each pixel into the
> + * histogram, defined by &ipu3_uapi_ae_weight_elem LUT, is indexed by a grid.
> + */
> +struct ipu3_uapi_ae_grid_config {
> +	__u8 width;
> +	__u8 height;
> +	__u8 block_width_log2:4;
> +	__u8 block_height_log2:4;
> +	__u8 __reserved0:5;

Why add a reserved bitfield? What is its purpose?

> +	__u8 ae_en:1;
> +	__u8 rst_hist_array:1;
> +	__u8 done_rst_hist_array:1;
> +	__u16 x_start;
> +	__u16 y_start;
> +	__u16 x_end;
> +	__u16 y_end;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_ae_weight_elem - AE weights LUT
> + *
> + * @cell0: weighted histogram grid value.
> + * @cell1: weighted histogram grid value.
> + * @cell2: weighted histogram grid value.
> + * @cell3: weighted histogram grid value.
> + * @cell4: weighted histogram grid value.
> + * @cell5: weighted histogram grid value.
> + * @cell6: weighted histogram grid value.
> + * @cell7: weighted histogram grid value.
> + *
> + * Use weighted grid value to give a different contribution factor to each cell.
> + */
> +struct ipu3_uapi_ae_weight_elem {
> +	__u32 cell0:4;
> +	__u32 cell1:4;
> +	__u32 cell2:4;
> +	__u32 cell3:4;
> +	__u32 cell4:4;
> +	__u32 cell5:4;
> +	__u32 cell6:4;
> +	__u32 cell7:4;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_ae_ccm - AE coefficients for WB and CCM
> + *
> + * @gain_gr: WB gain factor for the gr channels. Default 256.
> + * @gain_r: WB gain factor for the r channel. Default 256.
> + * @gain_b: WB gain factor for the b channel. Default 256.
> + * @gain_gb: WB gain factor for the gb channels. Default 256.
> + * @mat: 4x4 matrix that transforms Bayer quad output from WB to RGB+Y.
> + *
> + * Default:
> + *	128, 0, 0, 0,
> + *	0, 128, 0, 0,
> + *	0, 0, 128, 0,
> + *	0, 0, 0, 128,
> + *
> + * As part of the raw frame pre-process stage, the WB and color conversion need
> + * to be applied to expose the impact of these gain operations.
> + */
> +struct ipu3_uapi_ae_ccm {
> +	__u16 gain_gr;
> +	__u16 gain_r;
> +	__u16 gain_b;
> +	__u16 gain_gb;
> +	__s16 mat[16];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_ae_config - AE config
> + *
> + * @grid_cfg:	config for auto exposure statistics grid. See struct
> + *		&ipu3_uapi_ae_grid_config
> + * @weights:	&IPU3_UAPI_AE_WEIGHTS is based on 32x24 blocks in the grid.
> + *		Each grid cell has a corresponding value in weights LUT called
> + *		grid value, global histogram is updated based on grid value and
> + *		pixel value.
> + * @ae_ccm:	Color convert matrix pre-processing block.
> + *
> + * Calculate AE grid from image resolution, resample ae weights.
> + */
> +struct ipu3_uapi_ae_config {
> +	IPU3_ALIGN struct ipu3_uapi_ae_grid_config grid_cfg;
> +	IPU3_ALIGN struct ipu3_uapi_ae_weight_elem weights[
> +						IPU3_UAPI_AE_WEIGHTS];
> +	IPU3_ALIGN struct ipu3_uapi_ae_ccm ae_ccm;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_af_filter_config - AF 2D filter for contrast measurements
> + *
> + * @y1_coeff_0:	filter Y1, structure: 3x11, support both symmetry and
> + *		anti-symmetry type. A12 is center, A1-A11 are neighbours.
> + *		for analyzing low frequency content, used to calculate sum
> + *		of gradients in x direction.
> + * @y1_coeff_0.a1:	filter1 coefficients A1, default 0.
> + * @y1_coeff_0.a2:	filter1 coefficients A2, default 0.
> + * @y1_coeff_0.a3:	filter1 coefficients A3, default 0.
> + * @y1_coeff_0.a4:	filter1 coefficients A4, default 0.
> + * @y1_coeff_1:		Struct
> + * @y1_coeff_1.a5:	filter1 coefficients A5, default 0.
> + * @y1_coeff_1.a6:	filter1 coefficients A6, default 0.
> + * @y1_coeff_1.a7:	filter1 coefficients A7, default 0.
> + * @y1_coeff_1.a8:	filter1 coefficients A8, default 0.
> + * @y1_coeff_2:		Struct
> + * @y1_coeff_2.a9:	filter1 coefficients A9, default 0.
> + * @y1_coeff_2.a10:	filter1 coefficients A10, default 0.
> + * @y1_coeff_2.a11:	filter1 coefficients A11, default 0.
> + * @y1_coeff_2.a12:	filter1 coefficients A12, default 128.
> + * @y1_sign_vec:	Each bit corresponds to one coefficient sign bit,
> + *			0: positive, 1: negative, default 0.
> + * @y2_coeff_0:	Y2, same structure as Y1. For analyzing high frequency content.
> + * @y2_coeff_0.a1:	filter2 coefficients A1, default 0.
> + * @y2_coeff_0.a2:	filter2 coefficients A2, default 0.
> + * @y2_coeff_0.a3:	filter2 coefficients A3, default 0.
> + * @y2_coeff_0.a4:	filter2 coefficients A4, default 0.
> + * @y2_coeff_1:	Struct
> + * @y2_coeff_1.a5:	filter2 coefficients A5, default 0.
> + * @y2_coeff_1.a6:	filter2 coefficients A6, default 0.
> + * @y2_coeff_1.a7:	filter2 coefficients A7, default 0.
> + * @y2_coeff_1.a8:	filter2 coefficients A8, default 0.
> + * @y2_coeff_2:	Struct
> + * @y2_coeff_2.a9:	filter1 coefficients A9, default 0.
> + * @y2_coeff_2.a10:	filter1 coefficients A10, default 0.
> + * @y2_coeff_2.a11:	filter1 coefficients A11, default 0.
> + * @y2_coeff_2.a12:	filter1 coefficients A12, default 128.
> + * @y2_sign_vec:	Each bit corresponds to one coefficient sign bit,
> + *			0: positive, 1: negative, default 0.
> + * @y_calc:	Pre-processing that converts Bayer quad to RGB+Y values to be
> + *		used for building histogram. Range [0..32], default 8.
> + * Rule:
> + *		y_gen_rate_gr + y_gen_rate_r + y_gen_rate_b + y_gen_rate_gb = 32
> + *		A single Y is calculated based on sum of Gr/R/B/Gb based on
> + *		their contribution ratio.
> + * @y_calc.y_gen_rate_gr:	Contribution ratio Gr for Y
> + * @y_calc.y_gen_rate_r:	Contribution ratio R for Y
> + * @y_calc.y_gen_rate_b:	Contribution ratio B for Y
> + * @y_calc.y_gen_rate_gb:	Contribution ratio Gb for Y
> + * @nf:	The shift right value that should be applied during the Y1/Y2 filter to
> + *	make sure the total memory needed is 2 bytes per grid cell.
> + * @nf.__reserved0:	reserved
> + * @nf.y1_nf:	Normalization factor for the convolution coeffs of y1,
> + *		should be log2 of the sum of the abs values of the filter
> + *		coeffs, default 7 (2^7 = 128).
> + * @nf.__reserved1:	reserved
> + * @nf.y2_nf:	Normalization factor for y2, should be log2 of the sum of the
> + *		abs values of the filter coeffs.
> + * @nf.__reserved2:	reserved
> + */
> +struct ipu3_uapi_af_filter_config {
> +	struct {
> +		__u8 a1;
> +		__u8 a2;
> +		__u8 a3;
> +		__u8 a4;
> +	} y1_coeff_0;
> +	struct {
> +		__u8 a5;
> +		__u8 a6;
> +		__u8 a7;
> +		__u8 a8;
> +	} y1_coeff_1;
> +	struct {
> +		__u8 a9;
> +		__u8 a10;
> +		__u8 a11;
> +		__u8 a12;
> +	} y1_coeff_2;
> +
> +	__u32 y1_sign_vec;
> +
> +	struct {
> +		__u8 a1;
> +		__u8 a2;
> +		__u8 a3;
> +		__u8 a4;
> +	} y2_coeff_0;
> +	struct {
> +		__u8 a5;
> +		__u8 a6;
> +		__u8 a7;
> +		__u8 a8;
> +	} y2_coeff_1;
> +	struct {
> +		__u8 a9;
> +		__u8 a10;
> +		__u8 a11;
> +		__u8 a12;
> +	} y2_coeff_2;
> +
> +	__u32 y2_sign_vec;
> +
> +	struct {
> +		__u8 y_gen_rate_gr;
> +		__u8 y_gen_rate_r;
> +		__u8 y_gen_rate_b;
> +		__u8 y_gen_rate_gb;
> +	} y_calc;
> +
> +	struct {
> +		__u32 __reserved0:8;
> +		__u32 y1_nf:4;
> +		__u32 __reserved1:4;
> +		__u32 y2_nf:4;
> +		__u32 __reserved2:12;
> +	} nf;
> +} __packed;
> +
> +#define IPU3_UAPI_AF_MAX_SETS				24
> +#define IPU3_UAPI_AF_MD_ITEM_SIZE			4
> +#define IPU3_UAPI_AF_SPARE_FOR_BUBBLES \
> +	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
> +	 IPU3_UAPI_AF_MD_ITEM_SIZE)
> +#define IPU3_UAPI_AF_Y_TABLE_SET_SIZE			0x80
> +#define IPU3_UAPI_AF_Y_TABLE_MAX_SIZE \
> +	(IPU3_UAPI_AF_MAX_SETS * \
> +	 (IPU3_UAPI_AF_Y_TABLE_SET_SIZE + IPU3_UAPI_AF_SPARE_FOR_BUBBLES) * \
> +	 IPU3_UAPI_MAX_STRIPES)
> +
> +/**
> + * struct ipu3_uapi_af_meta_data - AF meta data
> + *
> + * @y_table:	Each color component will be convolved separately with filter1
> + *		and filter2 and the result will be summed out and averaged for
> + *		each cell.
> + */
> +struct ipu3_uapi_af_meta_data {
> +	__u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN;

Here IPU3_ALIGN is put at the end...

> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_af_raw_buffer - AF raw buffer
> + *
> + * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus meta data.
> + */
> +struct ipu3_uapi_af_raw_buffer {
> +	IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data;

... and here at the start. Is that due to the difference between an array and a struct?

> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_af_config_s - AF config
> + *
> + * @filter_config: AF uses Y1 and Y2 filters as configured in
> + *		   &ipu3_uapi_af_filter_config
> + * @padding: paddings
> + * @grid_cfg: See &ipu3_uapi_grid_config, default resolution 16x16. Use large
> + *	      grid size for large image and vice versa.
> + */
> +struct ipu3_uapi_af_config_s {
> +	IPU3_ALIGN struct ipu3_uapi_af_filter_config filter_config;
> +	__u8 padding[4];

Is the padding still needed with the IPU3_ALIGNs?

> +	IPU3_ALIGN struct ipu3_uapi_grid_config grid_cfg;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_af_config - AF config wrapper
> + *
> + * @config: config for auto focus as defined by &ipu3_uapi_af_config_s
> + */
> +struct ipu3_uapi_af_config {
> +	struct ipu3_uapi_af_config_s config;
> +} __packed;
> +
> +#define IPU3_UAPI_AWB_FR_MAX_SETS			24
> +#define IPU3_UAPI_AWB_FR_MD_ITEM_SIZE			8
> +#define IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE			0x100
> +#define IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES \
> +	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
> +	 IPU3_UAPI_AWB_FR_MD_ITEM_SIZE)
> +#define IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE \
> +	(IPU3_UAPI_AWB_FR_MAX_SETS * \
> +	(IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE + \
> +	 IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES) * IPU3_UAPI_MAX_STRIPES)

Add newline

> +/**
> + * struct ipu3_uapi_awb_fr_meta_data - AWB filter response meta data
> + *
> + * @bayer_table: Statistics output on the grid after convolving with 1D filter.
> + */
> +struct ipu3_uapi_awb_fr_meta_data {
> +	IPU3_ALIGN __u8 bayer_table[IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_awb_fr_raw_buffer - AWB filter response raw buffer
> + *
> + * @meta_data: See &ipu3_uapi_awb_fr_meta_data.
> + */
> +struct ipu3_uapi_awb_fr_raw_buffer {
> +	struct ipu3_uapi_awb_fr_meta_data meta_data;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_awb_fr_config_s - AWB filter response config
> + *
> + * @grid_cfg:	grid config, default 16x16.
> + * @bayer_coeff:	1D Filter 1x11 center symmetry/anti-symmetry.
> + *			coeffcients defaults { 0, 0, 0, 0, 0, 128 }.
> + *			Applied on whole image for each Bayer channel separately
> + *			by a weighted sum of its 11x1 neighbors.
> + * @__reserved1:	reserved
> + * @bayer_sign:	sign of filter coeffcients, default 0.
> + * @bayer_nf:	normalization factor for the convolution coeffs, to make sure
> + *		total memory needed is within pre-determined range.
> + *		NF should be the log2 of the sum of the abs values of the
> + *		filter coeffs, range [7..14], default 7.
> + * @__reserved2:	reserved
> + */
> +struct ipu3_uapi_awb_fr_config_s {
> +	struct ipu3_uapi_grid_config grid_cfg;
> +	__u8 bayer_coeff[6];
> +	__u16 __reserved1;
> +	__u32 bayer_sign;
> +	__u8 bayer_nf;
> +	__u8 __reserved2[3];
> +} IPU3_ALIGN __packed;
> +
> +/**
> + * struct ipu3_uapi_awb_fr_config - AWB filter response config wrapper
> + *
> + * @config:	See &ipu3_uapi_awb_fr_config_s.
> + */
> +struct ipu3_uapi_awb_fr_config {
> +	struct ipu3_uapi_awb_fr_config_s config;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_4a_config - 4A config
> + *
> + * @awb_config: &ipu3_uapi_awb_config_s, default resolution 16x16
> + * @ae_grd_config: auto exposure statistics &ipu3_uapi_ae_grid_config
> + * @padding: paddings
> + * @af_config: auto focus config &ipu3_uapi_af_config_s
> + * @awb_fr_config: &ipu3_uapi_awb_fr_config_s, default resolution 16x16
> + */
> +struct ipu3_uapi_4a_config {
> +	IPU3_ALIGN struct ipu3_uapi_awb_config_s awb_config;
> +	struct ipu3_uapi_ae_grid_config ae_grd_config;
> +	__u8 padding[20];

Can 'padding' be replaced by IPU3_ALIGN?

> +	struct ipu3_uapi_af_config_s af_config;
> +	struct ipu3_uapi_awb_fr_config_s awb_fr_config;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bubble_info - Bubble info for host side debugging
> + *
> + * @num_of_stripes: A single frame is divided into several parts called stripes
> + *		    due to limitation on line buffer memory.
> + *		    The separation between the stripes is vertical. Each such
> + *		    stripe is processed as a single frame by the ISP pipe.
> + * @padding: padding bytes.
> + * @num_sets: number of sets.
> + * @padding1: padding bytes.
> + * @size_of_set: set size.
> + * @padding2: padding bytes.
> + * @bubble_size: is the amount of padding in the bubble expressed in “sets”.
> + * @padding3: padding bytes.
> + */
> +struct ipu3_uapi_bubble_info {
> +	IPU3_ALIGN __u32 num_of_stripes;
> +	__u8 padding[28];
> +	__u32 num_sets;
> +	__u8 padding1[28];
> +	__u32 size_of_set;
> +	__u8 padding2[28];
> +	__u32 bubble_size;
> +	__u8 padding3[28];

Same question here and elsewhere.

> +} __packed;
> +
> +/*
> + * struct ipu3_uapi_stats_3a_bubble_info_per_stripe
> + */
> +struct ipu3_uapi_stats_3a_bubble_info_per_stripe {
> +	struct ipu3_uapi_bubble_info awb[IPU3_UAPI_MAX_STRIPES];
> +	struct ipu3_uapi_bubble_info af[IPU3_UAPI_MAX_STRIPES];
> +	struct ipu3_uapi_bubble_info awb_fr[IPU3_UAPI_MAX_STRIPES];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_ff_status - Enable bits for each 3A fixed function
> + *
> + * @awb_en: auto white balance enable
> + * @padding: padding config
> + * @ae_en: auto exposure enable
> + * @padding1: padding config
> + * @af_en: auto focus enable
> + * @padding2: padding config
> + * @awb_fr_en: awb filter response enable bit
> + * @padding3: padding config
> + */
> +struct ipu3_uapi_ff_status {
> +	IPU3_ALIGN __u32 awb_en;
> +	__u8 padding[28];
> +	__u32 ae_en;
> +	__u8 padding1[28];
> +	__u32 af_en;
> +	__u8 padding2[28];
> +	__u32 awb_fr_en;
> +	__u8 padding3[28];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_stats_3a - 3A statistics
> + *
> + * @awb_raw_buffer: auto white balance meta data &ipu3_uapi_awb_raw_buffer
> + * @ae_raw_buffer: auto exposure raw data &ipu3_uapi_ae_raw_buffer_aligned
> + * @af_raw_buffer: &ipu3_uapi_af_raw_buffer for auto focus meta data
> + * @awb_fr_raw_buffer: value as specified by &ipu3_uapi_awb_fr_raw_buffer
> + * @stats_4a_config: 4a statistics config as defined by &ipu3_uapi_4a_config.
> + * @ae_join_buffers: 1 to use ae_raw_buffer.
> + * @padding: padding config
> + * @stats_3a_bubble_per_stripe: a &ipu3_uapi_stats_3a_bubble_info_per_stripe
> + * @stats_3a_status: 3a statistics status set in &ipu3_uapi_ff_status
> + */
> +struct ipu3_uapi_stats_3a {
> +	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> +	struct ipu3_uapi_ae_raw_buffer_aligned
> +			ae_raw_buffer[IPU3_UAPI_MAX_STRIPES];
> +	struct ipu3_uapi_af_raw_buffer af_raw_buffer;
> +	struct ipu3_uapi_awb_fr_raw_buffer awb_fr_raw_buffer;
> +	struct ipu3_uapi_4a_config stats_4a_config;
> +	__u32 ae_join_buffers;
> +	__u8 padding[28];
> +	struct ipu3_uapi_stats_3a_bubble_info_per_stripe
> +			stats_3a_bubble_per_stripe;
> +	struct ipu3_uapi_ff_status stats_3a_status;
> +} __packed;
> +
> +/******************* ipu3_uapi_acc_param *******************/
> +
> +#define IPU3_UAPI_ISP_VEC_ELEMS				64
> +#define IPU3_UAPI_ISP_TNR3_VMEM_LEN			9
> +
> +#define IPU3_UAPI_BNR_LUT_SIZE				32
> +
> +/* number of elements in gamma correction LUT */
> +#define IPU3_UAPI_GAMMA_CORR_LUT_ENTRIES		256
> +
> +/* largest grid is 73x56, for grid_height_per_slice of 2, 73x2 = 146 */
> +#define IPU3_UAPI_SHD_MAX_CELLS_PER_SET			146
> +#define IPU3_UAPI_SHD_MAX_CFG_SETS			28
> +/* Normalization shift aka nf */
> +#define IPU3_UAPI_SHD_BLGR_NF_SHIFT			13
> +#define IPU3_UAPI_SHD_BLGR_NF_MASK			0x7
> +
> +#define IPU3_UAPI_YUVP2_TCC_MACC_TABLE_ELEMENTS		16
> +#define IPU3_UAPI_YUVP2_TCC_INV_Y_LUT_ELEMENTS		14
> +#define IPU3_UAPI_YUVP2_TCC_GAIN_PCWL_LUT_ELEMENTS	258
> +#define IPU3_UAPI_YUVP2_TCC_R_SQR_LUT_ELEMENTS		24
> +
> +#define IPU3_UAPI_ANR_LUT_SIZE				26
> +#define IPU3_UAPI_ANR_PYRAMID_SIZE			22
> +#define IPU3_UAPI_ANR_MAX_XRESET			(BIT(12) - 1)
> +
> +#define IPU3_UAPI_LIN_LUT_SIZE				64
> +
> +/* Bayer Noise Reduction related structs */
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_wb_gains_config - White balance gains
> + *
> + * @gr:	white balance gain for Gr channel.
> + * @r:	white balance gain for R channel.
> + * @b:	white balance gain for B channel.
> + * @gb:	white balance gain for Gb channel.
> + *
> + * Precision u3.13, range [0,8). White balance correction is done by applying
> + * a multiplicative gain to each color channels prior to BNR.
> + */
> +struct ipu3_uapi_bnr_static_config_wb_gains_config {
> +	__u16 gr;
> +	__u16 r;
> +	__u16 b;
> +	__u16 gb;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_wb_gains_thr_config - Threshold config
> + *
> + * @gr:	white balance threshold gain for Gr channel.
> + * @r:	white balance threshold gain for R channel.
> + * @b:	white balance threshold gain for B channel.
> + * @gb:	white balance threshold gain for Gb channel.
> + *
> + * Defines the threshold that specifies how different a defect pixel can be from
> + * its neighbors.(used by dynamic defect pixel correction sub block)
> + * Precision u4.4 range [0,8).
> + */
> +struct ipu3_uapi_bnr_static_config_wb_gains_thr_config {
> +	__u8 gr;
> +	__u8 r;
> +	__u8 b;
> +	__u8 gb;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_thr_coeffs_config - Noise model
> + *				coefficients that controls noise threshold
> + *
> + * @cf:	Free coefficient for threshold calculation, range [0..8191], default 0.
> + * @__reserved0:	reserved
> + * @cg:	Gain coefficient for threshold calculation, [0..31], default 8.
> + * @ci:	Intensity coefficient for threshold calculation. u3.2, range [0..7.75]
> + *	default 6.
> + * @__reserved1:	reserved
> + * @r_nf:	Normalization shift value for r^2 calculation, range [12 .. 20]
> + *		where r is a radius of pixel [row, col] from centor of sensor.
> + *		default 14.
> + *
> + * Threshold used to distinguish between noise and details.
> + */
> +struct ipu3_uapi_bnr_static_config_thr_coeffs_config {
> +	__u32 cf:13;
> +	__u32 __reserved0:3;
> +	__u32 cg:5;
> +	__u32 ci:5;
> +	__u32 __reserved1:1;
> +	__u32 r_nf:5;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config - Shading config
> + *
> + * @gr:	Coefficient defines lens shading gain approximation for gr channel
> + * @r:	Coefficient defines lens shading gain approximation for r channel
> + * @b:	Coefficient defines lens shading gain approximation for b channel
> + * @gb:	Coefficient defines lens shading gain approximation for gb channel
> + *
> + * Parameters for noise model (NM) adaptation of BNR due to shading correction.
> + * All above have precision of u3.3, default to 0.
> + */
> +struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config {
> +	__u8 gr;
> +	__u8 r;
> +	__u8 b;
> +	__u8 gb;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_opt_center_config - Optical center config
> + *
> + * @x_reset:	Reset value of X (col start - X center). Precision s12.0.
> + * @__reserved0:	reserved
> + * @y_reset:	Reset value of Y (row start - Y center). Precision s12.0.
> + * @__reserved2:	reserved
> + *
> + * Distance from corner to optical center for NM adaptation due to shading
> + * correction (should be calculated based on shading tables)
> + */
> +struct ipu3_uapi_bnr_static_config_opt_center_config {
> +	__s32 x_reset:13;
> +	__u32 __reserved0:3;
> +	__s32 y_reset:13;
> +	__u32 __reserved2:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_lut_config - BNR square root lookup table
> + *
> + * @values: pre-calculated values of square root function.
> + *
> + * LUT implementation of square root operation.
> + */
> +struct ipu3_uapi_bnr_static_config_lut_config {
> +	__u8 values[IPU3_UAPI_BNR_LUT_SIZE];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_bp_ctrl_config - Detect bad pixels (bp)
> + *
> + * @bp_thr_gain:	Defines the threshold that specifies how different a
> + *			defect pixel can be from its neighbors. Threshold is
> + *			dependent on de-noise threshold calculated by algorithm.
> + *			Range [4..31], default 4.
> + * @__reserved0:	reserved
> + * @defect_mode:	Mode of addressed defect pixels,
> + *			0 – single defect pixel is expected,
> + *			1 - 2 adjacent defect pixels are expected, default 1.
> + * @bp_gain:	Defines how 2nd derivation that passes through a defect pixel
> + *		is different from 2nd derivations that pass through
> + *		neighbor pixels. u4.2, range [0-256), default 8.
> + * @__reserved1:	reserved
> + * @w0_coeff:	Blending coefficient of defect pixel correction.
> + *		Precision u4, range [0..8], default 8.
> + * @__reserved2:	reserved
> + * @w1_coeff:	Enable influence of incorrect defect pixel correction to be
> + *		avoided. Precision u4, range [1..8], default 8.
> + * @__reserved3:	reserved
> + */
> +struct ipu3_uapi_bnr_static_config_bp_ctrl_config {
> +	__u32 bp_thr_gain:5;
> +	__u32 __reserved0:2;
> +	__u32 defect_mode:1;
> +	__u32 bp_gain:6;
> +	__u32 __reserved1:18;
> +	__u32 w0_coeff:4;
> +	__u32 __reserved2:4;
> +	__u32 w1_coeff:4;
> +	__u32 __reserved3:20;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config - Denoising config
> + *
> + * @alpha:	Weight of central element of smoothing filter.
> + * @beta:	Weight of peripheral elements of smoothing filter, default 4.
> + * @gamma:	Weight of diagonal elements of smoothing filter, default 4.
> + *
> + * beta and gamma parameter define the strength of the noise removal filter.
> + * All above has precision u0.4, range [0..0xF].
> + *
> + * @__reserved0:	reserved
> + * @max_inf:	Maximum increase of peripheral or diagonal element influence
> + *		relative to the pre-defined value range: [0x5..0xA]
> + * @__reserved1:	reserved
> + * @gd_enable:	Green disparity enable control, 0 - disable, 1 - enable.
> + * @bpc_enable:	Bad pixel correction enable control, 0 - disable, 1 - enable.
> + * @bnr_enable:	Bayer noise removal enable control, 0 - disable, 1 - enable.
> + * @ff_enable:	Fixed function enable, 0 - disable, 1 - enable.
> + * @__reserved2:	reserved
> + */
> +struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config {
> +	__u32 alpha:4;
> +	__u32 beta:4;
> +	__u32 gamma:4;
> +	__u32 __reserved0:4;
> +	__u32 max_inf:4;
> +	__u32 __reserved1:7;
> +	__u32 gd_enable:1;
> +	__u32 bpc_enable:1;
> +	__u32 bnr_enable:1;
> +	__u32 ff_enable:1;
> +	__u32 __reserved2:1;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_opt_center_sqr_config - BNR optical square
> + *
> + * @x_sqr_reset: Reset value of X^2.
> + * @y_sqr_reset: Reset value of Y^2.
> + *
> + * Please note:
> + *
> + *    #. X and Y ref to
> + *       &ipu3_uapi_bnr_static_config_opt_center_config
> + *    #. Both structs are used in threshold formula to calculate r^2, where r
> + *       is a radius of pixel [row, col] from centor of sensor.
> + */
> +struct ipu3_uapi_bnr_static_config_opt_center_sqr_config {
> +	__u32 x_sqr_reset;
> +	__u32 y_sqr_reset;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config - BNR static config
> + *
> + * @wb_gains:	white balance gains &ipu3_uapi_bnr_static_config_wb_gains_config
> + * @wb_gains_thr:	white balance gains threshold as defined by
> + *			&ipu3_uapi_bnr_static_config_wb_gains_thr_config
> + * @thr_coeffs:	coefficients of threshold
> + *		&ipu3_uapi_bnr_static_config_thr_coeffs_config
> + * @thr_ctrl_shd:	control of shading threshold
> + *			&ipu3_uapi_bnr_static_config_thr_ctrl_shd_config
> + * @opt_center:	optical center &ipu3_uapi_bnr_static_config_opt_center_config
> + *
> + * Above parameters and opt_center_sqr are used for white balance and shading.
> + *
> + * @lut:	lookup table &ipu3_uapi_bnr_static_config_lut_config
> + * @bp_ctrl:	detect and remove bad pixels as defined in struct
> + *		&ipu3_uapi_bnr_static_config_bp_ctrl_config
> + * @dn_detect_ctrl:	detect and remove noise.
> + *			&ipu3_uapi_bnr_static_config_dn_detect_ctrl_config
> + * @column_size:	The number of pixels in column.
> + * @opt_center_sqr:	Reset value of r^2 to optical center, see
> + *			&ipu3_uapi_bnr_static_config_opt_center_sqr_config.
> + */
> +struct ipu3_uapi_bnr_static_config {
> +	struct ipu3_uapi_bnr_static_config_wb_gains_config wb_gains;
> +	struct ipu3_uapi_bnr_static_config_wb_gains_thr_config wb_gains_thr;
> +	struct ipu3_uapi_bnr_static_config_thr_coeffs_config thr_coeffs;
> +	struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config thr_ctrl_shd;
> +	struct ipu3_uapi_bnr_static_config_opt_center_config opt_center;
> +	struct ipu3_uapi_bnr_static_config_lut_config lut;
> +	struct ipu3_uapi_bnr_static_config_bp_ctrl_config bp_ctrl;
> +	struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config dn_detect_ctrl;
> +	__u32 column_size;
> +	struct ipu3_uapi_bnr_static_config_opt_center_sqr_config opt_center_sqr;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_bnr_static_config_green_disparity - Correct green disparity
> + *
> + * @gd_red:	Shading gain coeff for gr disparity level in bright red region.
> + *		Precision u0.6, default 4(0.0625).
> + * @__reserved0:	reserved
> + * @gd_green:	Shading gain coeff for gr disparity level in bright green
> + *		region. Precision u0.6, default 4(0.0625).
> + * @__reserved1:	reserved
> + * @gd_blue:	Shading gain coeff for gr disparity level in bright blue region.
> + *		Precision u0.6, default 4(0.0625).
> + * @__reserved2:	reserved
> + * @gd_black:	Maximal green disparity level in dark region (stronger disparity
> + *		assumed to be image detail). Precision u14, default 80.
> + * @__reserved3:	reserved
> + * @gd_shading:	Change maximal green disparity level according to square
> + *		distance from image center.
> + * @__reserved4:	reserved
> + * @gd_support:	Lower bound for the number of second green color pixels in
> + *		current pixel neighborhood with less than threshold difference
> + *		from it.
> + *
> + * The shading gain coeff of red, green, blue and black are used to calculate
> + * threshold given a pixel's color value and its coordinates in the image.
> + *
> + * @__reserved5:	reserved
> + * @gd_clip:	Turn green disparity clip on/off, [0,1], default 1.
> + * @gd_central_weight:	Central pixel weight in 9 pixels weighted sum.
> + */
> +struct ipu3_uapi_bnr_static_config_green_disparity {
> +	__u32 gd_red:6;
> +	__u32 __reserved0:2;
> +	__u32 gd_green:6;
> +	__u32 __reserved1:2;
> +	__u32 gd_blue:6;
> +	__u32 __reserved2:10;
> +	__u32 gd_black:14;
> +	__u32 __reserved3:2;
> +	__u32 gd_shading:7;
> +	__u32 __reserved4:1;
> +	__u32 gd_support:2;
> +	__u32 __reserved5:1;
> +	__u32 gd_clip:1;
> +	__u32 gd_central_weight:4;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_dm_config - De-mosaic parameters
> + *
> + * @dm_en:	de-mosaic enable.
> + * @ch_ar_en:	Checker artifacts removal enable flag. Default 0.
> + * @fcc_en:	False color correction (FCC) enable flag. Default 0.
> + * @__reserved0:	reserved
> + * @frame_width:	do not care
> + * @gamma_sc:	Sharpening coefficient (coefficient of 2-d derivation of
> + *		complementary color in Hamilton-Adams interpolation).
> + *		u5, range [0-31], default 8.
> + * @__reserved1:	reserved
> + * @lc_ctrl:	Parameter that controls weights of Chroma Homogeneity metric
> + *		in calculation of final homogeneity metric.
> + *		u5, range [0-31], default 7.
> + * @__reserved2:	reserved
> + * @cr_param1:	First parameter that defines Checker artifact removal
> + *		feature gain.Precision u5, range [0-31], default 8.
> + * @__reserved3:	reserved
> + * @cr_param2:	Second parameter that defines Checker artifact removal
> + *		feature gain. Precision u5, range [0-31], default 8.
> + * @__reserved4:	reserved
> + * @coring_param:	Defines power of false color correction operation.
> + *			low for preserving edge colors, high for preserving gray
> + *			edge artifacts. u1.4, range [0-1.9375], default 4(0.25).
> + * @__reserved5:	reserved
> + *
> + * The demosaic fixed function block is responsible to covert Bayer(mosaiced)
> + * images into color images based on demosaicing algorithm.
> + */
> +struct ipu3_uapi_dm_config {
> +	/* DWORD0 */
> +	__u32 dm_en:1;
> +	__u32 ch_ar_en:1;
> +	__u32 fcc_en:1;
> +	__u32 __reserved0:13;
> +	__u32 frame_width:16;
> +
> +	/* DWORD1 */
> +	__u32 gamma_sc:5;
> +	__u32 __reserved1:3;
> +	__u32 lc_ctrl:5;
> +	__u32 __reserved2:3;
> +	__u32 cr_param1:5;
> +	__u32 __reserved3:3;
> +	__u32 cr_param2:5;
> +	__u32 __reserved4:3;
> +
> +	/* DWORD2 */
> +	__u32 coring_param:5;
> +	__u32 __reserved5:27;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_ccm_mat_config - Color correction matrix
> + *
> + * @coeff_m11: CCM 3x3 coefficient, range -65536, 65535
> + * @coeff_m12: CCM 3x3 coefficient, range -8192, 8191
> + * @coeff_m13: CCM 3x3 coefficient, range -32768, 32767
> + * @coeff_o_r: Bias 3x1 coefficient, range -8191, 8181
> + * @coeff_m21: CCM 3x3 coefficient, range -32767, 32767
> + * @coeff_m22: CCM 3x3 coefficient, range -8192, 8191
> + * @coeff_m23: CCM 3x3 coefficient, range -32768, 32767
> + * @coeff_o_g: Bias 3x1 coefficient, range -8191, 8181
> + * @coeff_m31: CCM 3x3 coefficient, range -32768, 32767
> + * @coeff_m32: CCM 3x3 coefficient, range -8192, 8191
> + * @coeff_m33: CCM 3x3 coefficient, range -32768, 32767
> + * @coeff_o_b: Bias 3x1 coefficient, range -8191, 8181
> + *
> + * Transform sensor specific color space to standard sRGB by applying 3x3 matrix
> + * and adding a bias vector O. The transformation is basically a rotation and
> + * translation in the 3-dimensional color spaces. Here are the defaults:
> + *
> + *	9775,	-2671,	1087,	0
> + *	-1071,	8303,	815,	0
> + *	-23,	-7887,	16103,	0
> + */
> +struct ipu3_uapi_ccm_mat_config {
> +	__s16 coeff_m11;
> +	__s16 coeff_m12;
> +	__s16 coeff_m13;
> +	__s16 coeff_o_r;
> +	__s16 coeff_m21;
> +	__s16 coeff_m22;
> +	__s16 coeff_m23;
> +	__s16 coeff_o_g;
> +	__s16 coeff_m31;
> +	__s16 coeff_m32;
> +	__s16 coeff_m33;
> +	__s16 coeff_o_b;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_gamma_corr_ctrl - Gamma correction
> + *
> + * @enable: gamma correction enable.
> + * @__reserved: reserved
> + */
> +struct ipu3_uapi_gamma_corr_ctrl {
> +	__u32 enable:1;
> +	__u32 __reserved:31;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_gamma_corr_lut - Per-pixel tone mapping implemented as LUT.
> + *
> + * @lut:	256 tabulated values of the gamma function. LUT[1].. LUT[256]
> + *		format u13.0, range (0, 8191).
> + *
> + * The tone mapping operation is done by a Piece wise linear graph
> + * that is implemented as a lookup table(LUT). The pixel component input
> + * intensity is the X-axis of the graph which is the table entry.
> + */
> +struct ipu3_uapi_gamma_corr_lut {
> +	__u16 lut[IPU3_UAPI_GAMMA_CORR_LUT_ENTRIES];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_gamma_config - Gamma config
> + *
> + * @gc_ctrl: control of gamma correction &ipu3_uapi_gamma_corr_ctrl
> + * @gc_lut: lookup table of gamma correction &ipu3_uapi_gamma_corr_lut
> + */
> +struct ipu3_uapi_gamma_config {
> +	IPU3_ALIGN struct ipu3_uapi_gamma_corr_ctrl gc_ctrl;
> +	IPU3_ALIGN struct ipu3_uapi_gamma_corr_lut gc_lut;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_csc_mat_config - Color space conversion matrix config
> + *
> + * @coeff_c11:	Conversion matrix value, format s0.14, range (-1,1), default 1.
> + * @coeff_c12:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> + * @coeff_c13:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> + * @coeff_b1:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
> + * @coeff_c21:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> + * @coeff_c22:	Conversion matrix value, format s0.14, range (-1,1), default 1.
> + * @coeff_c23:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> + * @coeff_b2:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
> + * @coeff_c31:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> + * @coeff_c32:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> + * @coeff_c33:	Conversion matrix value, format s0.14, range (-1,1), default 1.
> + * @coeff_b3:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
> + *
> + * To transform each pixel from RGB to YUV (Y - brightness/luminance,
> + * UV -chroma) by applying the pixel's values by a 3x3 matrix and adding an
> + * optional bias 3x1 vector.
> + */
> +struct ipu3_uapi_csc_mat_config {
> +	__s16 coeff_c11;
> +	__s16 coeff_c12;
> +	__s16 coeff_c13;
> +	__s16 coeff_b1;
> +	__s16 coeff_c21;
> +	__s16 coeff_c22;
> +	__s16 coeff_c23;
> +	__s16 coeff_b2;
> +	__s16 coeff_c31;
> +	__s16 coeff_c32;
> +	__s16 coeff_c33;
> +	__s16 coeff_b3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_cds_params - Chroma down-scaling
> + *
> + * @ds_c00:	range 0, 3
> + * @ds_c01:	range 0, 3
> + * @ds_c02:	range 0, 3
> + * @ds_c03:	range 0, 3
> + * @ds_c10:	range 0, 3
> + * @ds_c11:	range 0, 3
> + * @ds_c12:	range 0, 3
> + * @ds_c13:	range 0, 3
> + *
> + * Above are 4x2 filter has the following defaults:
> + *	1, 3, 3, 1,
> + *	1, 3, 3, 1,
> + *
> + * @ds_nf:	Normalization factor for Chroma output downscaling filter,
> + *		range 0,4, default 2.
> + * @__reserved0:	reserved
> + * @csc_en:	Color space conversion enable
> + * @uv_bin_output:	0: output YUV 4.2.0, 1: output YUV 4.2.2(default).
> + * @__reserved1:	reserved
> + */
> +struct ipu3_uapi_cds_params {
> +	__u32 ds_c00:2;
> +	__u32 ds_c01:2;
> +	__u32 ds_c02:2;
> +	__u32 ds_c03:2;
> +	__u32 ds_c10:2;
> +	__u32 ds_c11:2;
> +	__u32 ds_c12:2;
> +	__u32 ds_c13:2;
> +	__u32 ds_nf:5;
> +	__u32 __reserved0:3;
> +	__u32 csc_en:1;
> +	__u32 uv_bin_output:1;
> +	__u32 __reserved1:6;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_shd_grid_config - Bayer shading(darkening) correction
> + *
> + * @width:	Grid horizontal dimensions, u8, [8, 128], default 73
> + * @height:	Grid vertical dimensions, u8, [8, 128], default 56
> + * @block_width_log2:	Log2 of the width of the grid cell in pixel count
> + *			u4, [0, 15], default value 5.
> + * @__reserved0:	reserved
> + * @block_height_log2:	Log2 of the height of the grid cell in pixel count
> + *			u4, [0, 15], default value 6.
> + * @__reserved1:	reserved
> + * @grid_height_per_slice:	SHD_MAX_CELLS_PER_SET/width.
> + *				(with SHD_MAX_CELLS_PER_SET = 146).
> + * @x_start:	X value of top left corner of sensor relative to ROI
> + *		u12, [-4096 0]. default 0, only negative values.
> + * @y_start:	Y value of top left corner of sensor relative to ROI
> + *		u12, [-4096 0]. default 0, only negative values.
> + */
> +struct ipu3_uapi_shd_grid_config {
> +	/* reg 0 */
> +	__u8 width;
> +	__u8 height;
> +	__u8 block_width_log2:3;
> +	__u8 __reserved0:1;
> +	__u8 block_height_log2:3;
> +	__u8 __reserved1:1;
> +	__u8 grid_height_per_slice;
> +	/* reg 1 */
> +	__s16 x_start;
> +	__s16 y_start;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_shd_general_config - Shading general config
> + *
> + * @init_set_vrt_offst_ul: set vertical offset,
> + *			y_start >> block_height_log2 % grid_height_per_slice.
> + * @shd_enable: shading enable.
> + * @gain_factor: Gain factor. Shift calculated anti shading value. Precision u2.
> + *		0x0 - gain factor [1..5), means no shift interpolated value.
> + *		0x1 - gain factor [1..9), means shift interpolated by 1.
> + *		0x2 - gain factor [1..17), means shift interpolated by 2.
> + * @__reserved: reserved
> + *
> + * Correction is performed by multiplying a gain factor for each of the 4 Bayer
> + * channels as a function of the pixel location in the sensor.
> + */
> +struct ipu3_uapi_shd_general_config {
> +	__u32 init_set_vrt_offst_ul:8;
> +	__u32 shd_enable:1;
> +	/* aka 'gf' */
> +	__u32 gain_factor:2;
> +	__u32 __reserved:21;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_shd_black_level_config - Black level correction
> + *
> + * @bl_r:	Bios values for green red. s11 range [-2048, 2047].
> + * @bl_gr:	Bios values for green blue. s11 range [-2048, 2047].
> + * @bl_gb:	Bios values for red. s11 range [-2048, 2047].
> + * @bl_b:	Bios values for blue. s11 range [-2048, 2047].
> + */
> +struct ipu3_uapi_shd_black_level_config {
> +	__s16 bl_r;
> +	__s16 bl_gr;
> +	__s16 bl_gb;
> +	__s16 bl_b;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_shd_config_static - Shading config static
> + *
> + * @grid:	shading grid config &ipu3_uapi_shd_grid_config
> + * @general:	shading general config &ipu3_uapi_shd_general_config
> + * @black_level:	black level config for shading correction as defined by
> + *			&ipu3_uapi_shd_black_level_config
> + */
> +struct ipu3_uapi_shd_config_static {
> +	struct ipu3_uapi_shd_grid_config grid;
> +	struct ipu3_uapi_shd_general_config general;
> +	struct ipu3_uapi_shd_black_level_config black_level;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_shd_lut - Shading gain factor lookup table.
> + *
> + * @sets: array
> + * @sets.r_and_gr: Red and GreenR Lookup table.
> + * @sets.r_and_gr.r: Red shading factor.
> + * @sets.r_and_gr.gr: GreenR shading factor.
> + * @sets.__reserved1: reserved
> + * @sets.gb_and_b: GreenB and Blue Lookup table.
> + * @sets.gb_and_b.gb: GreenB shading factor.
> + * @sets.gb_and_b.b: Blue shading factor.
> + * @sets.__reserved2: reserved
> + *
> + * Map to shading correction LUT register set.
> + */
> +struct ipu3_uapi_shd_lut {
> +	struct {
> +		struct {
> +			__u16 r;
> +			__u16 gr;
> +		} r_and_gr[IPU3_UAPI_SHD_MAX_CELLS_PER_SET];
> +		__u8 __reserved1[24];
> +		struct {
> +			__u16 gb;
> +			__u16 b;
> +		} gb_and_b[IPU3_UAPI_SHD_MAX_CELLS_PER_SET];
> +		__u8 __reserved2[24];
> +	} sets[IPU3_UAPI_SHD_MAX_CFG_SETS];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_shd_config - Shading config
> + *
> + * @shd:	shading static config, see &ipu3_uapi_shd_config_static
> + * @shd_lut:	shading lookup table &ipu3_uapi_shd_lut
> + */
> +struct ipu3_uapi_shd_config {
> +	IPU3_ALIGN struct ipu3_uapi_shd_config_static shd;
> +	IPU3_ALIGN struct ipu3_uapi_shd_lut shd_lut;
> +} __packed;
> +
> +/* Image Enhancement Filter directed */
> +
> +/**
> + * struct ipu3_uapi_iefd_cux2 - IEFd Config Unit 2 parameters
> + *
> + * @x0:		X0 point of Config Unit, u9.0, default 0.
> + * @x1:		X1 point of Config Unit, u9.0, default 0.
> + * @a01:	Slope A of Config Unit, s4.4, default 0.
> + * @b01:	Always 0.
> + *
> + * Calculate weight for blending directed and non-directed denoise elements
> + *
> + * Note:
> + * Each instance of Config Unit needs X coordinate of n points and
> + * slope A factor between points calculated by driver based on calibration
> + * parameters.
> + */
> +struct ipu3_uapi_iefd_cux2 {
> +	__u32 x0:9;
> +	__u32 x1:9;
> +	__u32 a01:9;
> +	__u32 b01:5;	/* NOTE: hardcoded to zero */
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_iefd_cux6_ed - Calculate power of non-directed sharpening
> + *				   element, Config Unit 6 for edge detail (ED).
> + *
> + * @x0:	X coordinate of point 0, u9.0, default 0.
> + * @x1:	X coordinate of point 1, u9.0, default 0.
> + * @x2:	X coordinate of point 2, u9.0, default 0.
> + * @__reserved0:	reserved
> + * @x3:	X coordinate of point 3, u9.0, default 0.
> + * @x4:	X coordinate of point 4, u9.0, default 0.
> + * @x5:	X coordinate of point 5, u9.0, default 0.
> + * @__reserved1:	reserved
> + * @a01:	slope A points 01, s4.4, default 0.
> + * @a12:	slope A points 12, s4.4, default 0.
> + * @a23:	slope A points 23, s4.4, default 0.
> + * @__reserved2:	reserved
> + * @a34:	slope A points 34, s4.4, default 0.
> + * @a45:	slope A points 45, s4.4, default 0.
> + * @__reserved3:	reserved
> + * @b01:	slope B points 01, s4.4, default 0.
> + * @b12:	slope B points 12, s4.4, default 0.
> + * @b23:	slope B points 23, s4.4, default 0.
> + * @__reserved4:	reserved
> + * @b34:	slope B points 34, s4.4, default 0.
> + * @b45:	slope B points 45, s4.4, default 0.
> + * @__reserved5:	reserved
> + */
> +struct ipu3_uapi_iefd_cux6_ed {
> +	__u32 x0:9;
> +	__u32 x1:9;
> +	__u32 x2:9;
> +	__u32 __reserved0:5;
> +
> +	__u32 x3:9;
> +	__u32 x4:9;
> +	__u32 x5:9;
> +	__u32 __reserved1:5;
> +
> +	__u32 a01:9;
> +	__u32 a12:9;
> +	__u32 a23:9;
> +	__u32 __reserved2:5;
> +
> +	__u32 a34:9;
> +	__u32 a45:9;
> +	__u32 __reserved3:14;
> +
> +	__u32 b01:9;
> +	__u32 b12:9;
> +	__u32 b23:9;
> +	__u32 __reserved4:5;
> +
> +	__u32 b34:9;
> +	__u32 b45:9;
> +	__u32 __reserved5:14;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_iefd_cux2_1 - Calculate power of non-directed denoise
> + *				  element apply.
> + * @x0: X0 point of Config Unit, u9.0, default 0.
> + * @x1: X1 point of Config Unit, u9.0, default 0.
> + * @a01: Slope A of Config Unit, s4.4, default 0.
> + * @__reserved1: reserved
> + * @b01: offset B0 of Config Unit, u7.0, default 0.
> + * @__reserved2: reserved
> + */
> +struct ipu3_uapi_iefd_cux2_1 {
> +	__u32 x0:9;
> +	__u32 x1:9;
> +	__u32 a01:9;
> +	__u32 __reserved1:5;
> +
> +	__u32 b01:8;
> +	__u32 __reserved2:24;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_iefd_cux4 - Calculate power of non-directed sharpening
> + *				element.
> + *
> + * @x0:	X0 point of Config Unit, u9.0, default 0.
> + * @x1:	X1 point of Config Unit, u9.0, default 0.
> + * @x2:	X2 point of Config Unit, u9.0, default 0.
> + * @__reserved0:	reserved
> + * @x3:	X3 point of Config Unit, u9.0, default 0.
> + * @a01:	Slope A0 of Config Unit, s4.4, default 0.
> + * @a12:	Slope A1 of Config Unit, s4.4, default 0.
> + * @__reserved1:	reserved
> + * @a23:	Slope A2 of Config Unit, s4.4, default 0.
> + * @b01:	Offset B0 of Config Unit, s7.0, default 0.
> + * @b12:	Offset B1 of Config Unit, s7.0, default 0.
> + * @__reserved2:	reserved
> + * @b23:	Offset B2 of Config Unit, s7.0, default 0.
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_iefd_cux4 {
> +	__u32 x0:9;
> +	__u32 x1:9;
> +	__u32 x2:9;
> +	__u32 __reserved0:5;
> +
> +	__u32 x3:9;
> +	__u32 a01:9;
> +	__u32 a12:9;
> +	__u32 __reserved1:5;
> +
> +	__u32 a23:9;
> +	__u32 b01:8;
> +	__u32 b12:8;
> +	__u32 __reserved2:7;
> +
> +	__u32 b23:8;
> +	__u32 __reserved3:24;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_iefd_cux6_rad - Radial Config Unit (CU)
> + *
> + * @x0:	x0 points of Config Unit radial, u8.0
> + * @x1:	x1 points of Config Unit radial, u8.0
> + * @x2:	x2 points of Config Unit radial, u8.0
> + * @x3:	x3 points of Config Unit radial, u8.0
> + * @x4:	x4 points of Config Unit radial, u8.0
> + * @x5:	x5 points of Config Unit radial, u8.0
> + * @__reserved1: reserved
> + * @a01:	Slope A of Config Unit radial, s7.8
> + * @a12:	Slope A of Config Unit radial, s7.8
> + * @a23:	Slope A of Config Unit radial, s7.8
> + * @a34:	Slope A of Config Unit radial, s7.8
> + * @a45:	Slope A of Config Unit radial, s7.8
> + * @__reserved2: reserved
> + * @b01:	Slope B of Config Unit radial, s9.0
> + * @b12:	Slope B of Config Unit radial, s9.0
> + * @b23:	Slope B of Config Unit radial, s9.0
> + * @__reserved4: reserved
> + * @b34:	Slope B of Config Unit radial, s9.0
> + * @b45:	Slope B of Config Unit radial, s9.0
> + * @__reserved5: reserved
> + */
> +struct ipu3_uapi_iefd_cux6_rad {
> +	__u32 x0:8;
> +	__u32 x1:8;
> +	__u32 x2:8;
> +	__u32 x3:8;
> +
> +	__u32 x4:8;
> +	__u32 x5:8;
> +	__u32 __reserved1:16;
> +
> +	__u32 a01:16;
> +	__u32 a12:16;
> +
> +	__u32 a23:16;
> +	__u32 a34:16;
> +
> +	__u32 a45:16;
> +	__u32 __reserved2:16;
> +
> +	__u32 b01:10;
> +	__u32 b12:10;
> +	__u32 b23:10;
> +	__u32 __reserved4:2;
> +
> +	__u32 b34:10;
> +	__u32 b45:10;
> +	__u32 __reserved5:12;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_cfg_units - IEFd Config Units parameters
> + *
> + * @cu_1: calculate weight for blending directed and
> + *	  non-directed denoise elements. See &ipu3_uapi_iefd_cux2
> + * @cu_ed: calculate power of non-directed sharpening element, see
> + *	   &ipu3_uapi_iefd_cux6_ed
> + * @cu_3: calculate weight for blending directed and
> + *	  non-directed denoise elements. A &ipu3_uapi_iefd_cux2
> + * @cu_5: calculate power of non-directed denoise element apply, use
> + *	  &ipu3_uapi_iefd_cux2_1
> + * @cu_6: calculate power of non-directed sharpening element. See
> + *	  &ipu3_uapi_iefd_cux4
> + * @cu_7: calculate weight for blending directed and
> + *	  non-directed denoise elements. Use &ipu3_uapi_iefd_cux2
> + * @cu_unsharp: Config Unit of unsharp &ipu3_uapi_iefd_cux4
> + * @cu_radial: Config Unit of radial &ipu3_uapi_iefd_cux6_rad
> + * @cu_vssnlm: Config Unit of vssnlm &ipu3_uapi_iefd_cux2
> + */
> +struct ipu3_uapi_yuvp1_iefd_cfg_units {
> +	struct ipu3_uapi_iefd_cux2 cu_1;
> +	struct ipu3_uapi_iefd_cux6_ed cu_ed;
> +	struct ipu3_uapi_iefd_cux2 cu_3;
> +	struct ipu3_uapi_iefd_cux2_1 cu_5;
> +	struct ipu3_uapi_iefd_cux4 cu_6;
> +	struct ipu3_uapi_iefd_cux2 cu_7;
> +	struct ipu3_uapi_iefd_cux4 cu_unsharp;
> +	struct ipu3_uapi_iefd_cux6_rad cu_radial;
> +	struct ipu3_uapi_iefd_cux2 cu_vssnlm;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_config_s - IEFd config
> + *
> + * @horver_diag_coeff: Gradiant compensation, coefficient that compensates for
> + *		       different distance for vertical / horizontal and diagonal
> + *		       * gradient calculation (~1/sqrt(2)).
> + * @__reserved0: reserved
> + * @clamp_stitch: Slope to stitch between clamped and unclamped edge values
> + * @__reserved1: reserved
> + * @direct_metric_update: Update coeff for direction metric
> + * @__reserved2: reserved
> + * @ed_horver_diag_coeff: Radial Coefficient that compensates for
> + *			  different distance for vertical/horizontal and
> + *			  diagonal gradient calculation (~1/sqrt(2))
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_yuvp1_iefd_config_s {
> +	__u32 horver_diag_coeff:7;
> +	__u32 __reserved0:1;
> +	__u32 clamp_stitch:6;
> +	__u32 __reserved1:2;
> +	__u32 direct_metric_update:5;
> +	__u32 __reserved2:3;
> +	__u32 ed_horver_diag_coeff:7;
> +	__u32 __reserved3:1;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_control - IEFd control
> + *
> + * @iefd_en:	Enable IEFd
> + * @denoise_en:	Enable denoise
> + * @direct_smooth_en:	Enable directional smooth
> + * @rad_en:	Enable radial update
> + * @vssnlm_en:	Enable VSSNLM output filter
> + * @__reserved:	reserved
> + */
> +struct ipu3_uapi_yuvp1_iefd_control {
> +	__u32 iefd_en:1;
> +	__u32 denoise_en:1;
> +	__u32 direct_smooth_en:1;
> +	__u32 rad_en:1;
> +	__u32 vssnlm_en:1;
> +	__u32 __reserved:27;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_sharp_cfg - Sharpening config
> + *
> + * @nega_lmt_txt: Sharpening limit for negative overshoots for texture.
> + * @__reserved0: reserved
> + * @posi_lmt_txt: Sharpening limit for positive overshoots for texture.
> + * @__reserved1: reserved
> + * @nega_lmt_dir: Sharpening limit for negative overshoots for direction (edge).
> + * @__reserved2: reserved
> + * @posi_lmt_dir: Sharpening limit for positive overshoots for direction (edge).
> + * @__reserved3: reserved
> + *
> + * Fixed point type u13.0, range [0, 8191].
> + */
> +struct ipu3_uapi_sharp_cfg {
> +	__u32 nega_lmt_txt:13;
> +	__u32 __reserved0:19;
> +	__u32 posi_lmt_txt:13;
> +	__u32 __reserved1:19;
> +	__u32 nega_lmt_dir:13;
> +	__u32 __reserved2:19;
> +	__u32 posi_lmt_dir:13;
> +	__u32 __reserved3:19;
> +} __packed;
> +
> +/**
> + * struct struct ipu3_uapi_far_w - Sharpening config for far sub-group
> + *
> + * @dir_shrp:	Weight of wide direct sharpening, u1.6, range 0-64, default 64.
> + * @__reserved0:	reserved
> + * @dir_dns:	Weight of wide direct denoising, u1.6, range 0-64, default 0.
> + * @__reserved1:	reserved
> + * @ndir_dns_powr:	Power of non-direct denoising,
> + *			Precision u1.6, range 0-64, default 64.
> + * @__reserved2:	reserved
> + */
> +struct ipu3_uapi_far_w {
> +	__u32 dir_shrp:7;
> +	__u32 __reserved0:1;
> +	__u32 dir_dns:7;
> +	__u32 __reserved1:1;
> +	__u32 ndir_dns_powr:7;
> +	__u32 __reserved2:9;
> +} __packed;
> +
> +/**
> + * struct struct ipu3_uapi_unsharp_cfg - Unsharp config
> + *
> + * @unsharp_weight: Unsharp mask blending weight.
> + *		    u1.6, range 0-64, default 16.
> + *		    0 – disabled, 64 - use only unsharp.
> + * @__reserved0: reserved
> + * @unsharp_amount: Unsharp mask amount, u4.5, range 0-511, default 0.
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_unsharp_cfg {
> +	__u32 unsharp_weight:7;
> +	__u32 __reserved0:1;
> +	__u32 unsharp_amount:9;
> +	__u32 __reserved1:15;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_shrp_cfg - IEFd sharpness config
> + *
> + * @cfg: sharpness config &ipu3_uapi_sharp_cfg
> + * @far_w: wide range config, value as specified by &ipu3_uapi_far_w:
> + *	The 5x5 environment is separated into 2 sub-groups, the 3x3 nearest
> + *	neighbors (8 pixels called Near), and the second order neighborhood
> + *	around them (16 pixels called Far).
> + * @unshrp_cfg: unsharpness config. &ipu3_uapi_unsharp_cfg
> + */
> +struct ipu3_uapi_yuvp1_iefd_shrp_cfg {
> +	struct ipu3_uapi_sharp_cfg cfg;
> +	struct ipu3_uapi_far_w far_w;
> +	struct ipu3_uapi_unsharp_cfg unshrp_cfg;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_unsharp_coef0 - Unsharp mask coefficients
> + *
> + * @c00: Coeff11, s0.8, range -255 - 255, default 1.
> + * @c01: Coeff12, s0.8, range -255 - 255, default 5.
> + * @c02: Coeff13, s0.8, range -255 - 255, default 9.
> + * @__reserved: reserved
> + *
> + * Configurable registers for common sharpening support.
> + */
> +struct ipu3_uapi_unsharp_coef0 {
> +	__u32 c00:9;
> +	__u32 c01:9;
> +	__u32 c02:9;
> +	__u32 __reserved:5;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_unsharp_coef1 - Unsharp mask coefficients
> + *
> + * @c11: Coeff22, s0.8, range -255 - 255, default 29.
> + * @c12: Coeff23, s0.8, range -255 - 255, default 55.
> + * @c22: Coeff33, s0.8, range -255 - 255, default 96.
> + * @__reserved: reserved
> + */
> +struct ipu3_uapi_unsharp_coef1 {
> +	__u32 c11:9;
> +	__u32 c12:9;
> +	__u32 c22:9;
> +	__u32 __reserved:5;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_unshrp_cfg - Unsharp mask config
> + *
> + * @unsharp_coef0: unsharp coefficient 0 config. See &ipu3_uapi_unsharp_coef0
> + * @unsharp_coef1: unsharp coefficient 1 config. See &ipu3_uapi_unsharp_coef1
> + */
> +struct ipu3_uapi_yuvp1_iefd_unshrp_cfg {
> +	struct ipu3_uapi_unsharp_coef0 unsharp_coef0;
> +	struct ipu3_uapi_unsharp_coef1 unsharp_coef1;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_radial_reset_xy - Radial coordinate reset
> + *
> + * @x:	Radial reset of x coordinate. Precision s12, [-4095 .. 4095], default 0.
> + * @__reserved0:	reserved
> + * @y:	Radial center y coordinate. Precision s12, [-4095 .. 4095], default 0.
> + * @__reserved1:	reserved
> + */
> +struct ipu3_uapi_radial_reset_xy {
> +	__s32 x:13;
> +	__u32 __reserved0:3;
> +	__s32 y:13;
> +	__u32 __reserved1:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_radial_reset_x2 - Radial X^2 reset
> + *
> + * @x2:	Radial reset of x^2 coordinate. Precision u24, default 0.
> + * @__reserved:	reserved
> + */
> +struct ipu3_uapi_radial_reset_x2 {
> +	__u32 x2:24;
> +	__u32 __reserved:8;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_radial_reset_y2 - Radial Y^2 reset
> + *
> + * @y2:	Radial reset of y^2 coordinate. Precision u24, default 0.
> + * @__reserved:	reserved
> + */
> +struct ipu3_uapi_radial_reset_y2 {
> +	__u32 y2:24;
> +	__u32 __reserved:8;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_radial_cfg - Radial config
> + *
> + * @rad_nf: Radial. R^2 normalization factor is scale down by 2^ - (15 + scale)
> + * @__reserved0: reserved
> + * @rad_inv_r2: Radial R^-2 normelized to (0.5..1), Prec' u7, range [0 .. 127].
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_radial_cfg {
> +	__u32 rad_nf:4;
> +	__u32 __reserved0:4;
> +	__u32 rad_inv_r2:7;
> +	__u32 __reserved1:17;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_rad_far_w - Radial FAR sub-group
> + *
> + * @rad_dir_far_sharp_w: Weight of wide direct sharpening, u1.6, range 0-64,
> + *			 default 64.
> + * @rad_dir_far_dns_w: Weight of wide direct denoising, u1.6, range 0-64,
> + *			 default 0.
> + * @rad_ndir_far_dns_power: power of non-direct sharpening, u1.6, range 0-64,
> + *			 default 0.
> + * @__reserved: reserved
> + */
> +struct ipu3_uapi_rad_far_w {
> +	__u32 rad_dir_far_sharp_w:8;
> +	__u32 rad_dir_far_dns_w:8;
> +	__u32 rad_ndir_far_dns_power:8;
> +	__u32 __reserved:8;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_cu_cfg0 - Radius Config Unit cfg0 register
> + *
> + * @cu6_pow: Power of CU6. Power of non-direct sharpening, u3.4.
> + * @__reserved0: reserved
> + * @cu_unsharp_pow: Power of unsharp mask, u2.4.
> + * @__reserved1: reserved
> + * @rad_cu6_pow: Radial/corner CU6. Directed sharpening power, u3.4.
> + * @__reserved2: reserved
> + * @rad_cu_unsharp_pow: Radial power of unsharp mask, u2.4.
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_cu_cfg0 {
> +	__u32 cu6_pow:7;
> +	__u32 __reserved0:1;
> +	__u32 cu_unsharp_pow:7;
> +	__u32 __reserved1:1;
> +	__u32 rad_cu6_pow:7;
> +	__u32 __reserved2:1;
> +	__u32 rad_cu_unsharp_pow:6;
> +	__u32 __reserved3:2;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_cu_cfg1 - Radius Config Unit cfg1 register
> + *
> + * @rad_cu6_x1: X1 point of Config Unit 6, precision u9.0.
> + * @__reserved0: reserved
> + * @rad_cu_unsharp_x1: X1 point for Config Unit unsharp for radial/corner point
> + *			precision u9.0.
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_cu_cfg1 {
> +	__u32 rad_cu6_x1:9;
> +	__u32 __reserved0:1;
> +	__u32 rad_cu_unsharp_x1:9;
> +	__u32 __reserved1:13;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_rad_cfg - IEFd parameters changed radially over
> + *					 the picture plain.
> + *
> + * @reset_xy: reset xy value in radial calculation. &ipu3_uapi_radial_reset_xy
> + * @reset_x2: reset x square value in radial calculation. See struct
> + *	      &ipu3_uapi_radial_reset_x2
> + * @reset_y2: reset y square value in radial calculation, see struct
> + *	      &ipu3_uapi_radial_reset_y2
> + * @cfg: radial config defined in &ipu3_uapi_radial_cfg
> + * @rad_far_w: weight for wide range radial. &ipu3_uapi_rad_far_w
> + * @cu_cfg0: configuration unit 0. See &ipu3_uapi_cu_cfg0
> + * @cu_cfg1: configuration unit 1. See &ipu3_uapi_cu_cfg1
> + */
> +struct ipu3_uapi_yuvp1_iefd_rad_cfg {
> +	struct ipu3_uapi_radial_reset_xy reset_xy;
> +	struct ipu3_uapi_radial_reset_x2 reset_x2;
> +	struct ipu3_uapi_radial_reset_y2 reset_y2;
> +	struct ipu3_uapi_radial_cfg cfg;
> +	struct ipu3_uapi_rad_far_w rad_far_w;
> +	struct ipu3_uapi_cu_cfg0 cu_cfg0;
> +	struct ipu3_uapi_cu_cfg1 cu_cfg1;
> +} __packed;
> +
> +/* Vssnlm - Very small scale non-local mean algorithm */
> +
> +/**
> + * struct ipu3_uapi_vss_lut_x - Vssnlm LUT x0/x1/x2
> + *
> + * @vs_x0: Vssnlm LUT x0, precision u8, range 0-255, default 16.
> + * @vs_x1: Vssnlm LUT x1, precision u8, range 0-255, default 32.
> + * @vs_x2: Vssnlm LUT x2, precision u8, range 0-255, default 64.
> + * @__reserved2: reserved
> + */
> +struct ipu3_uapi_vss_lut_x {
> +	__u32 vs_x0:8;
> +	__u32 vs_x1:8;
> +	__u32 vs_x2:8;
> +	__u32 __reserved2:8;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_vss_lut_y - Vssnlm LUT y0/y1/y2
> + *
> + * @vs_y1: Vssnlm LUT y1, precision u4, range 0-8, default 1.
> + * @__reserved0: reserved
> + * @vs_y2: Vssnlm LUT y2, precision u4, range 0-8, default 3.
> + * @__reserved1: reserved
> + * @vs_y3: Vssnlm LUT y3, precision u4, range 0-8, default 8.
> + * @__reserved2: reserved
> + */
> +struct ipu3_uapi_vss_lut_y {
> +	__u32 vs_y1:4;
> +	__u32 __reserved0:4;
> +	__u32 vs_y2:4;
> +	__u32 __reserved1:4;
> +	__u32 vs_y3:4;
> +	__u32 __reserved2:12;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_vssnlm_cf - IEFd Vssnlm Lookup table
> + *
> + * @vss_lut_x: vss lookup table. See &ipu3_uapi_vss_lut_x description
> + * @vss_lut_y: vss lookup table. See &ipu3_uapi_vss_lut_y description
> + */
> +struct ipu3_uapi_yuvp1_iefd_vssnlm_cfg {
> +	struct ipu3_uapi_vss_lut_x vss_lut_x;
> +	struct ipu3_uapi_vss_lut_y vss_lut_y;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_iefd_config - IEFd config
> + *
> + * @units: configuration unit setting, &ipu3_uapi_yuvp1_iefd_cfg_units
> + * @config: configuration, as defined by &ipu3_uapi_yuvp1_iefd_config_s
> + * @control: control setting, as defined by &ipu3_uapi_yuvp1_iefd_control
> + * @sharp: sharpness setting, as defined by &ipu3_uapi_yuvp1_iefd_shrp_cfg
> + * @unsharp: unsharpness setting, as defined by &ipu3_uapi_yuvp1_iefd_unshrp_cfg
> + * @rad: radial setting, as defined by &ipu3_uapi_yuvp1_iefd_rad_cfg
> + * @vsslnm: vsslnm setting, as defined by &ipu3_uapi_yuvp1_iefd_vssnlm_cfg
> + */
> +struct ipu3_uapi_yuvp1_iefd_config {
> +	struct ipu3_uapi_yuvp1_iefd_cfg_units units;
> +	struct ipu3_uapi_yuvp1_iefd_config_s config;
> +	struct ipu3_uapi_yuvp1_iefd_control control;
> +	struct ipu3_uapi_yuvp1_iefd_shrp_cfg sharp;
> +	struct ipu3_uapi_yuvp1_iefd_unshrp_cfg unsharp;
> +	struct ipu3_uapi_yuvp1_iefd_rad_cfg rad;
> +	struct ipu3_uapi_yuvp1_iefd_vssnlm_cfg vsslnm;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_yds_config - Y Down-Sampling config
> + *
> + * @c00: range 0, 3, default 0x0
> + * @c01: range 0, 3, default 0x1
> + * @c02: range 0, 3, default 0x1
> + * @c03: range 0, 3, default 0x0
> + * @c10: range 0, 3, default 0x0
> + * @c11: range 0, 3, default 0x1
> + * @c12: range 0, 3, default 0x1
> + * @c13: range 0, 3, default 0x0
> + *
> + * Above are 4x2 filter coefficients for chroma output downscaling.
> + *
> + * @norm_factor: Normalization factor, range 0, 4, default 2
> + *		0 - divide by 1
> + *		1 - divide by 2
> + *		2 - divide by 4
> + *		3 - divide by 8
> + *		4 - divide by 16
> + * @__reserved0: reserved
> + * @bin_output: Down sampling on Luma channel in two optional modes
> + *		0 - Bin output 4.2.0 (default), 1 output 4.2.2.
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_yuvp1_yds_config {
> +	__u32 c00:2;
> +	__u32 c01:2;
> +	__u32 c02:2;
> +	__u32 c03:2;
> +	__u32 c10:2;
> +	__u32 c11:2;
> +	__u32 c12:2;
> +	__u32 c13:2;
> +	__u32 norm_factor:5;
> +	__u32 __reserved0:4;
> +	__u32 bin_output:1;
> +	__u32 __reserved1:6;
> +} __packed;
> +
> +/* Chroma Noise Reduction */
> +
> +/**
> + * struct ipu3_uapi_yuvp1_chnr_enable_config - Chroma noise reduction enable
> + *
> + * @enable: enable/disable chroma noise reduction
> + * @yuv_mode: 0 - YUV420, 1 - YUV422
> + * @__reserved0: reserved
> + * @col_size: number of columns in the frame, max width is 2560
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_yuvp1_chnr_enable_config {
> +	__u32 enable:1;
> +	__u32 yuv_mode:1;
> +	__u32 __reserved0:14;
> +	__u32 col_size:12;
> +	__u32 __reserved1:4;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_chnr_coring_config - Coring thresholds for UV
> + *
> + * @u: U coring level, u0.13, range [0.0, 1.0), default 0.0
> + * @__reserved0: reserved
> + * @v: V coring level, u0.13, range [0.0, 1.0), default 0.0
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_yuvp1_chnr_coring_config {
> +	__u32 u:13;
> +	__u32 __reserved0:3;
> +	__u32 v:13;
> +	__u32 __reserved1:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_chnr_sense_gain_config - Chroma noise reduction gains
> + *
> + * All sensitivity gain parameters have precision u13.0, range [0, 8191].
> + *
> + * @vy: Sensitivity of horizontal edge of Y, default 100
> + * @vu: Sensitivity of horizontal edge of U, default 100
> + * @vv: Sensitivity of horizontal edge of V, default 100
> + * @__reserved0: reserved
> + * @hy: Sensitivity of vertical edge of Y, default 50
> + * @hu: Sensitivity of vertical edge of U, default 50
> + * @hv: Sensitivity of vertical edge of V, default 50
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_yuvp1_chnr_sense_gain_config {
> +	__u32 vy:8;
> +	__u32 vu:8;
> +	__u32 vv:8;
> +	__u32 __reserved0:8;
> +
> +	__u32 hy:8;
> +	__u32 hu:8;
> +	__u32 hv:8;
> +	__u32 __reserved1:8;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_chnr_iir_fir_config - Chroma IIR/FIR filter config
> + *
> + * @fir_0h: Value of center tap in horizontal FIR, range [0..32], default 8.
> + * @__reserved0: reserved
> + * @fir_1h: Value of distance 1 in horizontal FIR, range [0..32], default 12.
> + * @__reserved1: reserved
> + * @fir_2h: Value of distance 2 tap in horizontal FIR, range [0..32], default 0.
> + * @dalpha_clip_val: weight for previous row in IIR, range [1..256], default 0.
> + * @__reserved2: reserved
> + */
> +struct ipu3_uapi_yuvp1_chnr_iir_fir_config {
> +	__u32 fir_0h:6;
> +	__u32 __reserved0:2;
> +	__u32 fir_1h:6;
> +	__u32 __reserved1:2;
> +	__u32 fir_2h:6;
> +	__u32 dalpha_clip_val:9;
> +	__u32 __reserved2:1;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_chnr_config - Chroma noise reduction config
> + *
> + * @enable: chroma noise reduction enable, see
> + *	    &ipu3_uapi_yuvp1_chnr_enable_config
> + * @coring: coring config for chroma noise reduction, see
> + *	    &ipu3_uapi_yuvp1_chnr_coring_config
> + * @sense_gain: sensitivity config for chroma noise reduction, see
> + *		ipu3_uapi_yuvp1_chnr_sense_gain_config
> + * @iir_fir: iir and fir config for chroma noise reduction, see
> + *	     ipu3_uapi_yuvp1_chnr_iir_fir_config
> + */
> +struct ipu3_uapi_yuvp1_chnr_config {
> +	struct ipu3_uapi_yuvp1_chnr_enable_config enable;
> +	struct ipu3_uapi_yuvp1_chnr_coring_config coring;
> +	struct ipu3_uapi_yuvp1_chnr_sense_gain_config sense_gain;
> +	struct ipu3_uapi_yuvp1_chnr_iir_fir_config iir_fir;
> +} __packed;
> +
> +/* Edge Enhancement and Noise Reduction */
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config - Luma(Y) edge enhancement low-pass
> + *					       filter coefficients
> + *
> + * @a_diag: Smoothing diagonal coefficient, u5.0.
> + * @__reserved0: reserved
> + * @a_periph: Image smoothing perpherial, u5.0.
> + * @__reserved1: reserved
> + * @a_cent: Image Smoothing center coefficient, u5.0.
> + * @__reserved2: reserved
> + * @enable: 0: Y_EE_NR disabled, output = input; 1: Y_EE_NR enabled.
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config {
> +	__u32 a_diag:5;
> +	__u32 __reserved0:3;
> +	__u32 a_periph:5;
> +	__u32 __reserved1:3;
> +	__u32 a_cent:5;
> +	__u32 __reserved2:9;
> +	__u32 enable:1;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_sense_config - Luma(Y) edge enhancement
> + *					noise reduction sensitivity gains
> + *
> + * @edge_sense_0: Sensitivity of edge in dark area. u13.0, default 8191.
> + * @__reserved0: reserved
> + * @delta_edge_sense: Difference in the sensitivity of edges between
> + *		      the bright and dark areas. u13.0, default 0.
> + * @__reserved1: reserved
> + * @corner_sense_0: Sensitivity of corner in dark area. u13.0, default 0.
> + * @__reserved2: reserved
> + * @delta_corner_sense: Difference in the sensitivity of corners between
> + *			the bright and dark areas. u13.0, default 8191.
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_sense_config {
> +	__u32 edge_sense_0:13;
> +	__u32 __reserved0:3;
> +	__u32 delta_edge_sense:13;
> +	__u32 __reserved1:3;
> +	__u32 corner_sense_0:13;
> +	__u32 __reserved2:3;
> +	__u32 delta_corner_sense:13;
> +	__u32 __reserved3:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_gain_config - Luma(Y) edge enhancement
> + *						noise reduction gain config
> + *
> + * @gain_pos_0: Gain for positive edge in dark area. u5.0, [0,16], default 2.
> + * @__reserved0: reserved
> + * @delta_gain_posi: Difference in the gain of edges between the bright and
> + *		     dark areas for positive edges. u5.0, [0,16], default 0.
> + * @__reserved1: reserved
> + * @gain_neg_0: Gain for negative edge in dark area. u5.0, [0,16], default 8.
> + * @__reserved2: reserved
> + * @delta_gain_neg: Difference in the gain of edges between the bright and
> + *		    dark areas for negative edges. u5.0, [0,16], default 0.
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_gain_config {
> +	__u32 gain_pos_0:5;
> +	__u32 __reserved0:3;
> +	__u32 delta_gain_posi:5;
> +	__u32 __reserved1:3;
> +	__u32 gain_neg_0:5;
> +	__u32 __reserved2:3;
> +	__u32 delta_gain_neg:5;
> +	__u32 __reserved3:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_clip_config - Luma(Y) edge enhancement
> + *					noise reduction clipping config
> + *
> + * @clip_pos_0: Limit of positive edge in dark area
> + * @__reserved0: reserved
> + * @delta_clip_posi: Difference in the limit of edges between the bright
> + *		     and dark areas for positive edges.
> + * @__reserved1: reserved
> + * @clip_neg_0: Limit of negative edge in dark area
> + * @__reserved2: reserved
> + * @delta_clip_neg: Difference in the limit of edges between the bright
> + *		    and dark areas for negative edges.
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_clip_config {
> +	__u32 clip_pos_0:5;
> +	__u32 __reserved0:3;
> +	__u32 delta_clip_posi:5;
> +	__u32 __reserved1:3;
> +	__u32 clip_neg_0:5;
> +	__u32 __reserved2:3;
> +	__u32 delta_clip_neg:5;
> +	__u32 __reserved3:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_frng_config - Luma(Y) edge enhancement
> + *						noise reduction fringe config
> + *
> + * @gain_exp: Common exponent of gains, u4, [0,8], default 2.
> + * @__reserved0: reserved
> + * @min_edge: Threshold for edge and smooth stitching, u13.
> + * @__reserved1: reserved
> + * @lin_seg_param: Power of LinSeg, u4.
> + * @__reserved2: reserved
> + * @t1: Parameter for enabling/disabling the edge enhancement, u1.0, [0,1],
> + *	default 1.
> + * @t2: Parameter for enabling/disabling the smoothing, u1.0, [0,1],
> + *	default 1.
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_frng_config {
> +	__u32 gain_exp:4;
> +	__u32 __reserved0:28;
> +	__u32 min_edge:13;
> +	__u32 __reserved1:3;
> +	__u32 lin_seg_param:4;
> +	__u32 __reserved2:4;
> +	__u32 t1:1;
> +	__u32 t2:1;
> +	__u32 __reserved3:6;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_diag_config - Luma(Y) edge enhancement
> + *					noise reduction diagonal config
> + *
> + * @diag_disc_g: Coefficient that prioritize diagonal edge direction on
> + *		 horizontal or vertical for final enhancement.
> + *		 u4.0, [1,15], default 1.
> + * @__reserved0: reserved
> + * @hvw_hor: Weight of horizontal/vertical edge enhancement for hv edge.
> + *		u2.2, [1,15], default 4.
> + * @dw_hor: Weight of diagonal edge enhancement for hv edge.
> + *		u2.2, [1,15], default 1.
> + * @hvw_diag: Weight of horizontal/vertical edge enhancement for diagonal edge.
> + *		u2.2, [1,15], default 1.
> + * @dw_diag: Weight of diagonal edge enhancement for diagonal edge.
> + *		u2.2, [1,15], default 4.
> + * @__reserved1: reserved
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_diag_config {
> +	__u32 diag_disc_g:4;
> +	__u32 __reserved0:4;
> +	__u32 hvw_hor:4;
> +	__u32 dw_hor:4;
> +	__u32 hvw_diag:4;
> +	__u32 dw_diag:4;
> +	__u32 __reserved1:8;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config - Luma(Y) edge enhancement
> + *		noise reduction false color correction (FCC) coring config
> + *
> + * @pos_0: Gain for positive edge in dark, u13.0, [0..16], default 0.
> + * @__reserved0: reserved
> + * @pos_delta: Gain for positive edge in bright, value: pos_0 + pos_delta <=16
> + *		u13.0, default 0.
> + * @__reserved1: reserved
> + * @neg_0: Gain for negative edge in dark area, u13.0, range [0..16], default 0.
> + * @__reserved2: reserved
> + * @neg_delta: Gain for negative edge in bright area. neg_0 + neg_delta <=16
> + *		u13.0, default 0.
> + * @__reserved3: reserved
> + *
> + * Coring is a simple soft thresholding technique.
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config {
> +	__u32 pos_0:13;
> +	__u32 __reserved0:3;
> +	__u32 pos_delta:13;
> +	__u32 __reserved1:3;
> +	__u32 neg_0:13;
> +	__u32 __reserved2:3;
> +	__u32 neg_delta:13;
> +	__u32 __reserved3:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp1_y_ee_nr_config - Edge enhancement and noise reduction
> + *
> + * @lpf: low-pass filter config. See &ipu3_uapi_yuvp1_y_ee_nr_lpf_config
> + * @sense: sensitivity config. See &ipu3_uapi_yuvp1_y_ee_nr_sense_config
> + * @gain: gain config as defined in &ipu3_uapi_yuvp1_y_ee_nr_gain_config
> + * @clip: clip config as defined in &ipu3_uapi_yuvp1_y_ee_nr_clip_config
> + * @frng: fringe config as defined in &ipu3_uapi_yuvp1_y_ee_nr_frng_config
> + * @diag: diagonal edge config. See &ipu3_uapi_yuvp1_y_ee_nr_diag_config
> + * @fc_coring: coring config for fringe control. See
> + *	       &ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config
> + */
> +struct ipu3_uapi_yuvp1_y_ee_nr_config {
> +	struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config lpf;
> +	struct ipu3_uapi_yuvp1_y_ee_nr_sense_config sense;
> +	struct ipu3_uapi_yuvp1_y_ee_nr_gain_config gain;
> +	struct ipu3_uapi_yuvp1_y_ee_nr_clip_config clip;
> +	struct ipu3_uapi_yuvp1_y_ee_nr_frng_config frng;
> +	struct ipu3_uapi_yuvp1_y_ee_nr_diag_config diag;
> +	struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config fc_coring;
> +} __packed;
> +
> +/* Total Color Correction */
> +
> +/**
> + * struct ipu3_uapi_yuvp2_tcc_gen_control_static_config - Total color correction
> + *				general control config
> + *
> + * @en:	0 – TCC disabled. Output = input 1 – TCC enabled.
> + * @blend_shift:	blend shift, Range[3,4]
> + * @gain_according_to_y_only:	0: Gain is calculated according to YUV,
> + *				1: Gain is calculated according to Y only
> + * @__reserved0: reserved
> + * @gamma:	Final blending coefficients.
> + * @__reserved1: reserved
> + * @delta:	Final blending coefficients.
> + * @__reserved2: reserved
> + */
> +struct ipu3_uapi_yuvp2_tcc_gen_control_static_config {
> +	__u32 en:1;
> +	__u32 blend_shift:3;
> +	__u32 gain_according_to_y_only:1;
> +	__u32 __reserved0:11;
> +	__s32 gamma:5;
> +	__u32 __reserved1:3;
> +	__s32 delta:5;
> +	__u32 __reserved2:3;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config - Total color correction
> + *				multi-axis color control (MACC) config
> + *
> + * @a: a coefficient for 2x2 MACC conversion matrix.
> + * @__reserved0: reserved
> + * @b: b coefficient  2x2 MACC conversion matrix.
> + * @__reserved1: reserved
> + * @c: c coefficient for 2x2 MACC conversion matrix.
> + * @__reserved2: reserved
> + * @d: d coefficient for 2x2 MACC conversion matrix.
> + * @__reserved3: reserved
> + */
> +struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config {
> +	__s32 a:12;
> +	__u32 __reserved0:4;
> +	__s32 b:12;
> +	__u32 __reserved1:4;
> +	__s32 c:12;
> +	__u32 __reserved2:4;
> +	__s32 d:12;
> +	__u32 __reserved3:4;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp2_tcc_macc_table_static_config - Total color correction
> + *				multi-axis color control (MACC) table array
> + *
> + * @entries: config for multi axis color correction, as specified by
> + *	     &ipu3_uapi_yuvp2_tcc_macc_elem_static_config
> + */
> +struct ipu3_uapi_yuvp2_tcc_macc_table_static_config {
> +	struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config
> +		entries[IPU3_UAPI_YUVP2_TCC_MACC_TABLE_ELEMENTS];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config - Total color correction
> + *				inverse y lookup table
> + *
> + * @entries: lookup table for inverse y estimation, and use it to estimate the
> + *	     ratio between luma and chroma. Chroma by approximate the absolute
> + *	     value of the radius on the chroma plane (R = sqrt(u^2+v^2) ) and
> + *	     luma by approximate by 1/Y.
> + */
> +struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config {
> +	__u16 entries[IPU3_UAPI_YUVP2_TCC_INV_Y_LUT_ELEMENTS];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config - Total color
> + *					correction lookup table for PCWL
> + *
> + * @entries: lookup table for gain piece wise linear transformation (PCWL)
> + */
> +struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config {
> +	__u16 entries[IPU3_UAPI_YUVP2_TCC_GAIN_PCWL_LUT_ELEMENTS];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config - Total color correction
> + *				lookup table for r square root
> + *
> + * @entries: lookup table for r square root estimation
> + */
> +struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config {
> +	__s16 entries[IPU3_UAPI_YUVP2_TCC_R_SQR_LUT_ELEMENTS];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_yuvp2_tcc_static_config- Total color correction static
> + *
> + * @gen_control: general config for Total Color Correction
> + * @macc_table: config for multi axis color correction
> + * @inv_y_lut: lookup table for inverse y estimation
> + * @gain_pcwl: lookup table for gain PCWL
> + * @r_sqr_lut: lookup table for r square root estimation.
> + */
> +struct ipu3_uapi_yuvp2_tcc_static_config {
> +	struct ipu3_uapi_yuvp2_tcc_gen_control_static_config gen_control;
> +	struct ipu3_uapi_yuvp2_tcc_macc_table_static_config macc_table;
> +	struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config inv_y_lut;
> +	struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config gain_pcwl;
> +	struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config r_sqr_lut;
> +} __packed;
> +
> +/* Advanced Noise Reduction related structs */
> +
> +/*
> + * struct ipu3_uapi_anr_alpha - Advanced noise reduction alpha
> + *
> + * Tunable parameters that are subject to modification according to the
> + * total gain used.
> + */
> +struct ipu3_uapi_anr_alpha {
> +	__u16 gr;
> +	__u16 r;
> +	__u16 b;
> +	__u16 gb;
> +	__u16 dc_gr;
> +	__u16 dc_r;
> +	__u16 dc_b;
> +	__u16 dc_gb;
> +} __packed;
> +
> +/*
> + * struct ipu3_uapi_anr_beta - Advanced noise reduction beta
> + *
> + * Tunable parameters that are subject to modification according to the
> + * total gain used.
> + */
> +struct ipu3_uapi_anr_beta {
> +	__u16 beta_gr;
> +	__u16 beta_r;
> +	__u16 beta_b;
> +	__u16 beta_gb;
> +} __packed;
> +
> +/*
> + * struct ipu3_uapi_anr_plain_color - Advanced noise reduction plain color with
> + *				      4x4 matrix
> + *
> + * Tunable parameters that are subject to modification according to the
> + * total gain used.
> + */
> +struct ipu3_uapi_anr_plain_color {
> +	__u16 reg_w_gr[16];
> +	__u16 reg_w_r[16];
> +	__u16 reg_w_b[16];
> +	__u16 reg_w_gb[16];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_anr_transform_config - Advanced noise reduction transform
> + *
> + * @enable: advanced noise reduction enabled.
> + * @adaptive_treshhold_en: On IPU3, adaptive threshold is always enabled.
> + * @__reserved1: reserved
> + * @__reserved2: reserved
> + * @alpha: using follow defaults:

follow -> following

> + *		13, 13, 13, 13, 0, 0, 0, 0
> + *		11, 11, 11, 11, 0, 0, 0, 0
> + *		14,  14, 14, 14, 0, 0, 0, 0
> + * @beta: use following defaults:
> + *		24, 24, 24, 24
> + *		21, 20, 20, 21
> + *		25, 25, 25, 25
> + * @color: use defaults defined in driver/media/pci/intel/ipu3-tables.c
> + * @sqrt_lut: 11 bits per element, values =
> + *					[724 768 810 849 887
> + *					923 958 991 1024 1056
> + *					1116 1145 1173 1201 1086
> + *					1228 1254 1280 1305 1330
> + *					1355 1379 1402 1425 1448]
> + * @xreset: Reset value of X for r^2 calculation Value: col_start-X_center
> + *	Constraint: Xreset + FrameWdith≤4095 Xreset≥ -4095, default -1632.
> + * @__reserved3: reserved
> + * @yreset: Reset value of Y for r^2 calculation Value: row_start-Y_center
> + *	 Constraint: Yreset + FrameHeight≤4095 Yreset≥ -4095, default -1224.
> + * @__reserved4: reserved
> + * @x_sqr_reset: Reset value of X^2 for r^2 calculation Value = (Xreset)^2
> + * @r_normfactor: Normalization factor for R. Default 14.
> + * @__reserved5: reserved
> + * @y_sqr_reset: Reset value of Y^2 for r^2 calculation Value = (Yreset)^2
> + * @gain_scale: Parameter describing shading gain as a function of distance
> + *		from the image center.
> + *		A single value per frame, loaded by the driver. Default 115.
> + */
> +struct ipu3_uapi_anr_transform_config {
> +	__u32 enable:1;			/* 0 or 1, disabled or enabled */
> +	__u32 adaptive_treshhold_en:1;	/* On IPU3, always enabled */
> +
> +	__u32 __reserved1:30;
> +	__u8 __reserved2[44];
> +
> +	struct ipu3_uapi_anr_alpha alpha[3];
> +	struct ipu3_uapi_anr_beta beta[3];
> +	struct ipu3_uapi_anr_plain_color color[3];
> +
> +	__u16 sqrt_lut[IPU3_UAPI_ANR_LUT_SIZE];	/* 11 bits per element */
> +
> +	__s16 xreset:13;
> +	__u16 __reserved3:3;
> +	__s16 yreset:13;
> +	__u16 __reserved4:3;
> +
> +	__u32 x_sqr_reset:24;
> +	__u32 r_normfactor:5;
> +	__u32 __reserved5:3;
> +
> +	__u32 y_sqr_reset:24;
> +	__u32 gain_scale:8;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_anr_stitch_pyramid - ANR stitch pyramid
> + *
> + * @entry0: pyramid LUT entry0, range [0x0..0x3F]
> + * @entry1: pyramid LUT entry1, range [0x0..0x3F]
> + * @entry2: pyramid LUT entry2, range [0x0..0x3F]
> + * @__reserved: reserved
> + */
> +struct ipu3_uapi_anr_stitch_pyramid {
> +	__u32 entry0:6;
> +	__u32 entry1:6;
> +	__u32 entry2:6;
> +	__u32 __reserved:14;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_anr_stitch_config - ANR stitch config
> + *
> + * @anr_stitch_en: enable stitch. Enabled with 1.
> + * @__reserved: reserved
> + * @pyramid: pyramid table as defined by &ipu3_uapi_anr_stitch_pyramid
> + *		default values:
> + *		{ 1, 3, 5 }, { 7, 7, 5 }, { 3, 1, 3 },
> + *		{ 9, 15, 21 }, { 21, 15, 9 }, { 3, 5, 15 },
> + *		{ 25, 35, 35 }, { 25, 15, 5 }, { 7, 21, 35 },
> + *		{ 49, 49, 35 }, { 21, 7, 7 }, { 21, 35, 49 },
> + *		{ 49, 35, 21 }, { 7, 5, 15 }, { 25, 35, 35 },
> + *		{ 25, 15, 5 }, { 3, 9, 15 }, { 21, 21, 15 },
> + *		{ 9, 3, 1 }, { 3, 5, 7 }, { 7, 5, 3}, { 1 }
> + */
> +struct ipu3_uapi_anr_stitch_config {
> +	__u32 anr_stitch_en;
> +	__u8 __reserved[44];
> +	struct ipu3_uapi_anr_stitch_pyramid pyramid[IPU3_UAPI_ANR_PYRAMID_SIZE];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_anr_config - ANR config
> + *
> + * @__reserved1: reserved
> + * @transform:	advanced noise reduction transform config as specified by
> + *		&ipu3_uapi_anr_transform_config
> + * @stitch: create 4x4 patch from 4 surrounding 8x8 patches.
> + * @__reserved2: reserved
> + */
> +struct ipu3_uapi_anr_config {
> +	IPU3_ALIGN __u8 __reserved1[8];
> +	IPU3_ALIGN struct ipu3_uapi_anr_transform_config transform;
> +	IPU3_ALIGN struct ipu3_uapi_anr_stitch_config stitch;
> +	IPU3_ALIGN __u8 __reserved2[8];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_acc_param - Accelerator cluster parameters
> + *
> + * ACC refers to the HW cluster containing all Fixed Functions(FFs). Each FF
> + * implements a specific algorithm.
> + *
> + * @bnr:	parameters for bayer noise reduction static config. See
> + *		&ipu3_uapi_bnr_static_config
> + * @green_disparity:	disparity static config between gr and gb channel.
> + *			See &ipu3_uapi_bnr_static_config_green_disparity
> + * @dm:	de-mosaic config. See &ipu3_uapi_dm_config
> + * @ccm:	color correction matrix. See &ipu3_uapi_ccm_mat_config
> + * @gamma:	gamma correction config. See &ipu3_uapi_gamma_config
> + * @csc:	color space conversion matrix. See &ipu3_uapi_csc_mat_config
> + * @cds:	color down sample config. See &ipu3_uapi_cds_params
> + * @shd:	lens shading correction config. See &ipu3_uapi_shd_config
> + * @iefd:	Image enhancement filter and denoise config.
> + *		&ipu3_uapi_yuvp1_iefd_config
> + * @yds_c0:	y down scaler config. &ipu3_uapi_yuvp1_yds_config
> + * @chnr_c0:	chroma noise reduction config. &ipu3_uapi_yuvp1_chnr_config
> + * @y_ee_nr:	y edge enhancement and noise reduction config.
> + *		&ipu3_uapi_yuvp1_y_ee_nr_config
> + * @yds:	y down scaler config. See &ipu3_uapi_yuvp1_yds_config
> + * @chnr:	chroma noise reduction config. See &ipu3_uapi_yuvp1_chnr_config
> + * @__reserved1: reserved
> + * @yds2:	y channel down scaler config. See &ipu3_uapi_yuvp1_yds_config
> + * @tcc:	total color correction config as defined in struct
> + *		&ipu3_uapi_yuvp2_tcc_static_config
> + * @__reserved2: reserved
> + * @anr:	advanced noise reduction config.See &ipu3_uapi_anr_config
> + * @awb_fr:	AWB filter response config. See ipu3_uapi_awb_fr_config
> + * @ae:	auto exposure config  As specified by &ipu3_uapi_ae_config
> + * @af:	auto focus config. As specified by &ipu3_uapi_af_config
> + * @awb:	auto white balance config. As specified by &ipu3_uapi_awb_config
> + */
> +struct ipu3_uapi_acc_param {
> +	struct ipu3_uapi_bnr_static_config bnr;
> +	IPU3_ALIGN struct ipu3_uapi_bnr_static_config_green_disparity
> +				green_disparity;
> +	IPU3_ALIGN struct ipu3_uapi_dm_config dm;
> +	IPU3_ALIGN struct ipu3_uapi_ccm_mat_config ccm;
> +	IPU3_ALIGN struct ipu3_uapi_gamma_config gamma;
> +	IPU3_ALIGN struct ipu3_uapi_csc_mat_config csc;
> +	IPU3_ALIGN struct ipu3_uapi_cds_params cds;
> +	IPU3_ALIGN struct ipu3_uapi_shd_config shd;
> +	IPU3_ALIGN struct ipu3_uapi_yuvp1_iefd_config iefd;
> +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds_c0;
> +	IPU3_ALIGN struct ipu3_uapi_yuvp1_chnr_config chnr_c0;
> +	IPU3_ALIGN struct ipu3_uapi_yuvp1_y_ee_nr_config y_ee_nr;
> +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds;
> +	IPU3_ALIGN struct ipu3_uapi_yuvp1_chnr_config chnr;
> +	IPU3_ALIGN __u8 __reserved1[516];
> +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds2;
> +	IPU3_ALIGN struct ipu3_uapi_yuvp2_tcc_static_config tcc;
> +	__u8 __reserved2[1152];
> +	struct ipu3_uapi_anr_config anr;
> +	struct ipu3_uapi_awb_fr_config awb_fr;
> +	struct ipu3_uapi_ae_config ae;
> +	struct ipu3_uapi_af_config af;
> +	struct ipu3_uapi_awb_config awb;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_isp_lin_vmem_params - Linearization parameters
> + *
> + * @lin_lutlow_gr: linearization look-up table for GR channel interpolation.
> + * @lin_lutlow_r: linearization look-up table for R channel interpolation.
> + * @lin_lutlow_b: linearization look-up table for B channel interpolation.
> + * @lin_lutlow_gb: linearization look-up table for GB channel interpolation.
> + *			lin_lutlow_gr / lin_lutlow_gr / lin_lutlow_gr /
> + *			lin_lutlow_gr <= LIN_MAX_VALUE - 1.
> + * @lin_lutdif_gr:	lin_lutlow_gr[i+1] - lin_lutlow_gr[i].
> + * @lin_lutdif_r:	lin_lutlow_r[i+1] - lin_lutlow_r[i].
> + * @lin_lutdif_b:	lin_lutlow_b[i+1] - lin_lutlow_b[i].
> + * @lin_lutdif_gb:	lin_lutlow_gb[i+1] - lin_lutlow_gb[i].
> + */
> +struct ipu3_uapi_isp_lin_vmem_params {
> +	__s16 lin_lutlow_gr[IPU3_UAPI_LIN_LUT_SIZE];
> +	__s16 lin_lutlow_r[IPU3_UAPI_LIN_LUT_SIZE];
> +	__s16 lin_lutlow_b[IPU3_UAPI_LIN_LUT_SIZE];
> +	__s16 lin_lutlow_gb[IPU3_UAPI_LIN_LUT_SIZE];
> +	__s16 lin_lutdif_gr[IPU3_UAPI_LIN_LUT_SIZE];
> +	__s16 lin_lutdif_r[IPU3_UAPI_LIN_LUT_SIZE];
> +	__s16 lin_lutdif_b[IPU3_UAPI_LIN_LUT_SIZE];
> +	__s16 lin_lutdif_gb[IPU3_UAPI_LIN_LUT_SIZE];
> +} __packed;
> +
> +/* Temporal Noise Reduction */
> +
> +/**
> + * struct ipu3_uapi_isp_tnr3_vmem_params - Temporal noise reduction vector
> + *					   memory parameters
> + *
> + * @slope: slope setting in interpolation curve for temporal noise reduction.
> + * @__reserved1: reserved
> + * @sigma: knee point setting in interpolation curve for temporal
> + *	   noise reduction.
> + * @__reserved2: reserved
> + */
> +struct ipu3_uapi_isp_tnr3_vmem_params {
> +	__u16 slope[IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> +	__u16 __reserved1[IPU3_UAPI_ISP_VEC_ELEMS
> +						- IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> +	__u16 sigma[IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> +	__u16 __reserved2[IPU3_UAPI_ISP_VEC_ELEMS
> +						- IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_isp_tnr3_params - Temporal noise reduction v3 parameters
> + *
> + * @knee_y1: Knee point TNR3 assumes standard deviation of Y,U and
> + *	V at Y1 are TnrY1_Sigma_Y, U and V.
> + * @knee_y2: Knee point TNR3 assumes standard deviation of Y,U and
> + *		V at Y2 are TnrY2_Sigma_Y, U and V.
> + * @maxfb_y: Max feedback gain for Y
> + * @maxfb_u: Max feedback gain for U
> + * @maxfb_v: Max feedback gain for V
> + * @round_adj_y: rounding Adjust for Y
> + * @round_adj_u: rounding Adjust for U
> + * @round_adj_v: rounding Adjust for V
> + * @ref_buf_select: selection of the reference frame buffer to be used.
> + */
> +struct ipu3_uapi_isp_tnr3_params {
> +	__u32 knee_y1;
> +	__u32 knee_y2;
> +	__u32 maxfb_y;
> +	__u32 maxfb_u;
> +	__u32 maxfb_v;
> +	__u32 round_adj_y;
> +	__u32 round_adj_u;
> +	__u32 round_adj_v;
> +	__u32 ref_buf_select;
> +} __packed;
> +
> +/* Extreme Noise Reduction version 3 */
> +
> +/**
> + * struct ipu3_uapi_isp_xnr3_vmem_params - Extreme noise reduction v3
> + *					   vector memory parameters
> + *
> + * @x: xnr3 parameters.
> + * @a: xnr3 parameters.
> + * @b: xnr3 parameters.
> + * @c: xnr3 parameters.
> + */
> +struct ipu3_uapi_isp_xnr3_vmem_params {
> +	__u16 x[IPU3_UAPI_ISP_VEC_ELEMS];
> +	__u16 a[IPU3_UAPI_ISP_VEC_ELEMS];
> +	__u16 b[IPU3_UAPI_ISP_VEC_ELEMS];
> +	__u16 c[IPU3_UAPI_ISP_VEC_ELEMS];
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_xnr3_alpha_params - Extreme noise reduction v3
> + *					alpha tuning parameters
> + *
> + * @y0: Sigma for Y range similarity in dark area.
> + * @u0: Sigma for U range similarity in dark area.
> + * @v0: Sigma for V range similarity in dark area.
> + * @ydiff: Sigma difference for Y between bright area and dark area.
> + * @udiff: Sigma difference for U between bright area and dark area.
> + * @vdiff: Sigma difference for V between bright area and dark area.
> + */
> +struct ipu3_uapi_xnr3_alpha_params {
> +	__u32 y0;
> +	__u32 u0;
> +	__u32 v0;
> +	__u32 ydiff;
> +	__u32 udiff;
> +	__u32 vdiff;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_xnr3_coring_params - Extreme noise reduction v3
> + *					 coring parameters
> + *
> + * @u0: Coring Threshold of U channel in dark area.
> + * @v0: Coring Threshold of V channel in dark area.
> + * @udiff: Threshold difference of U channel between bright and dark area.
> + * @vdiff: Threshold difference of V channel between bright and dark area.
> + */
> +struct ipu3_uapi_xnr3_coring_params {
> +	__u32 u0;
> +	__u32 v0;
> +	__u32 udiff;
> +	__u32 vdiff;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_xnr3_blending_params - Blending factor
> + *
> + * @strength: The factor for blending output with input. This is tuning
> + *	      parameterHigher values lead to more aggressive XNR operation.
> + */
> +struct ipu3_uapi_xnr3_blending_params {
> +	__u32 strength;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_isp_xnr3_params - Extreme noise reduction v3 parameters
> + *
> + * @alpha: parameters for xnr3 alpha. See &ipu3_uapi_xnr3_alpha_params
> + * @coring: parameters for xnr3 coring. See &ipu3_uapi_xnr3_coring_params
> + * @blending: parameters for xnr3 blending. See &ipu3_uapi_xnr3_blending_params
> + */
> +struct ipu3_uapi_isp_xnr3_params {
> +	struct ipu3_uapi_xnr3_alpha_params alpha;
> +	struct ipu3_uapi_xnr3_coring_params coring;
> +	struct ipu3_uapi_xnr3_blending_params blending;
> +} __packed;
> +
> +/***** Obgrid (optical black level compensation) table entry *****/
> +
> +/**
> + * struct ipu3_uapi_obgrid_param - Optical black level compensation parameters
> + *
> + * @gr: Grid table values for color GR
> + * @r: Grid table values for color R
> + * @b: Grid table values for color B
> + * @gb: Grid table values for color GB
> + *
> + * Black level is different for red, green, and blue channels. So black level
> + * compensation is different per channel.
> + */
> +struct ipu3_uapi_obgrid_param {
> +	__u16 gr;
> +	__u16 r;
> +	__u16 b;
> +	__u16 gb;
> +} __packed;
> +
> +/******************* V4L2_META_FMT_IPU3_PARAMS *******************/
> +
> +/**
> + * struct ipu3_uapi_flags - bits to indicate which pipeline needs update
> + *
> + * @gdc: 0 = no update, 1 = update.
> + * @obgrid: 0 = no update, 1 = update.
> + * @__reserved1: Not used.
> + * @acc_bnr: 0 = no update, 1 = update.
> + * @acc_green_disparity: 0 = no update, 1 = update.
> + * @acc_dm: 0 = no update, 1 = update.
> + * @acc_ccm: 0 = no update, 1 = update.
> + * @acc_gamma: 0 = no update, 1 = update.
> + * @acc_csc: 0 = no update, 1 = update.
> + * @acc_cds: 0 = no update, 1 = update.
> + * @acc_shd: 0 = no update, 1 = update.
> + * @__reserved2: Not used.
> + * @acc_iefd: 0 = no update, 1 = update.
> + * @acc_yds_c0: 0 = no update, 1 = update.
> + * @acc_chnr_c0: 0 = no update, 1 = update.
> + * @acc_y_ee_nr: 0 = no update, 1 = update.
> + * @acc_yds: 0 = no update, 1 = update.
> + * @acc_chnr: 0 = no update, 1 = update.
> + * @acc_ytm: 0 = no update, 1 = update.
> + * @acc_yds2: 0 = no update, 1 = update.
> + * @acc_tcc: 0 = no update, 1 = update.
> + * @acc_dpc: 0 = no update, 1 = update.
> + * @acc_bds: 0 = no update, 1 = update.
> + * @acc_anr: 0 = no update, 1 = update.
> + * @acc_awb_fr: 0 = no update, 1 = update.
> + * @acc_ae: 0 = no update, 1 = update.
> + * @acc_af: 0 = no update, 1 = update.
> + * @acc_awb: 0 = no update, 1 = update.
> + * @__acc_osys: 0 = no update, 1 = update.
> + * @__reserved3: Not used.
> + * @lin_vmem_params: 0 = no update, 1 = update.
> + * @tnr3_vmem_params: 0 = no update, 1 = update.
> + * @xnr3_vmem_params: 0 = no update, 1 = update.
> + * @tnr3_dmem_params: 0 = no update, 1 = update.
> + * @xnr3_dmem_params: 0 = no update, 1 = update.
> + * @__reserved4: Not used.
> + * @obgrid_param: 0 = no update, 1 = update.
> + * @__reserved5: Not used.
> + */
> +struct ipu3_uapi_flags {
> +	__u32 gdc:1;
> +	__u32 obgrid:1;
> +	__u32 __reserved1:32;
> +
> +	__u32 acc_bnr:1;
> +	__u32 acc_green_disparity:1;
> +	__u32 acc_dm:1;
> +	__u32 acc_ccm:1;
> +	__u32 acc_gamma:1;
> +	__u32 acc_csc:1;
> +	__u32 acc_cds:1;
> +	__u32 acc_shd:1;
> +	__u32 __reserved2:2;
> +	__u32 acc_iefd:1;
> +	__u32 acc_yds_c0:1;
> +	__u32 acc_chnr_c0:1;
> +	__u32 acc_y_ee_nr:1;
> +	__u32 acc_yds:1;
> +	__u32 acc_chnr:1;
> +	__u32 acc_ytm:1;
> +	__u32 acc_yds2:1;
> +	__u32 acc_tcc:1;
> +	__u32 acc_dpc:1;
> +	__u32 acc_bds:1;
> +	__u32 acc_anr:1;
> +	__u32 acc_awb_fr:1;
> +	__u32 acc_ae:1;
> +	__u32 acc_af:1;
> +	__u32 acc_awb:1;
> +	__u32 __reserved3:4;
> +
> +	__u32 lin_vmem_params:1;
> +	__u32 tnr3_vmem_params:1;
> +	__u32 xnr3_vmem_params:1;
> +	__u32 tnr3_dmem_params:1;
> +	__u32 xnr3_dmem_params:1;
> +	__u32 __reserved4:1;
> +	__u32 obgrid_param:1;
> +	__u32 __reserved5:25;
> +} __packed;
> +
> +/**
> + * struct ipu3_uapi_params - V4L2_META_FMT_IPU3_PARAMS
> + *
> + * @use:	select which parameters to apply, see &ipu3_uapi_flags
> + * @acc_param:	ACC parameters, as specified by &ipu3_uapi_acc_param
> + * @lin_vmem_params:	linearization VMEM, as specified by
> + *			&ipu3_uapi_isp_lin_vmem_params
> + * @tnr3_vmem_params:	tnr3 VMEM as specified by
> + *			&ipu3_uapi_isp_tnr3_vmem_params
> + * @xnr3_vmem_params:	xnr3 VMEM as specified by
> + *			&ipu3_uapi_isp_xnr3_vmem_params
> + * @tnr3_dmem_params:	tnr3 DMEM as specified by &ipu3_uapi_isp_tnr3_params
> + * @xnr3_dmem_params:	xnr3 DMEM as specified by &ipu3_uapi_isp_xnr3_params
> + * @obgrid_param:	obgrid parameters as specified by
> + *			&ipu3_uapi_obgrid_param
> + *
> + * The video queue "parameters" is of format V4L2_META_FMT_IPU3_PARAMS.
> + * This is a "single plane" v4l2_meta_format using V4L2_BUF_TYPE_META_OUTPUT.
> + *
> + * struct ipu3_uapi_params as defined below contains a lot of parameters and
> + * ipu3_uapi_flags selects which parameters to apply.
> + */
> +struct ipu3_uapi_params {
> +	/* Flags which of the settings below are to be applied */
> +	IPU3_ALIGN struct ipu3_uapi_flags use;
> +
> +	/* Accelerator cluster parameters */
> +	struct ipu3_uapi_acc_param acc_param;
> +
> +	/* ISP vector address space parameters */
> +	struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
> +	struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
> +	struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
> +
> +	/* ISP data memory (DMEM) parameters */
> +	struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
> +	struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
> +
> +	/* Optical black level compensation */
> +	struct ipu3_uapi_obgrid_param obgrid_param;
> +} __packed;
> +
> +#endif
> 

So the level of documentation looks good to me. The use of IPU3_ALIGN, padding and reserved fields
seems a bit of a mix to me, it's not always clear why a certain approach is taken.

Did you check if the layout of all these structs is the same between 32 and 64 bit code?
I would recommend that you automate this (e.g. abi-dumper might be useful for this).
I do need to have confirmation that they are indeed identical.

Finally I think we need a high-level description of how to use this:

I gather that with struct ipu3_uapi_flags you can indicate which blocks need to be updated,
and that for those blocks that do not need updating the corresponding structs are ignored.
If so, then that should be documented in pixfmt-meta-intel-ipu3.rst.

And what about the initial values? E.g. after a reboot, do all the blocks have sane default
values? Or do you need to supply those yourself? And if it is the latter, then we need
some open source example code that programs it with sane values. Users can take that as a
starting point and modify it.

If userspace needs to provide sane initial values, then it would be best if code
is added to v4l2-utils under contrib. Perhaps under a dual GPL/BSD license?

Regards,

	Hans

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mauro Carvalho Chehab]

Em Mon, 13 Aug 2018 15:42:34 +0200
Hans Verkuil <hverkuil@xs4all.nl> escreveu:

> On 15/06/18 05:29, Yong Zhi wrote:
> > These meta formats are used on Intel IPU3 ImgU video queues
> > to carry 3A statistics and ISP pipeline parameters.
> > 
> > V4L2_META_FMT_IPU3_3A
> > V4L2_META_FMT_IPU3_PARAMS
> > 
> > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > ---
> >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> >  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
> >  3 files changed, 2991 insertions(+)
> >  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> >  create mode 100644 include/uapi/linux/intel-ipu3.h
> > 
> > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst b/Documentation/media/uapi/v4l/meta-formats.rst
> > index 0c4e1ec..b887fca 100644
> > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata` interface only.
> >  .. toctree::
> >      :maxdepth: 1
> >  
> > +    pixfmt-meta-intel-ipu3
> >      pixfmt-meta-uvc
> >      pixfmt-meta-vsp1-hgo
> >      pixfmt-meta-vsp1-hgt
> > diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > new file mode 100644
> > index 0000000..5c050e6
> > --- /dev/null
> > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > @@ -0,0 +1,174 @@
> > +.. -*- coding: utf-8; mode: rst -*-
> > +
> > +.. _intel-ipu3:
> > +
> > +******************************************************************
> > +V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A ('ip3s')
> > +******************************************************************
> > +
> > +.. c:type:: ipu3_uapi_stats_3a
> > +
> > +3A statistics
> > +=============
> > +
> > +For IPU3 ImgU, the 3A statistics accelerators collect different statistics over
> > +an input bayer frame. Those statistics, defined in data struct
> > +:c:type:`ipu3_uapi_stats_3a`, are meta output obtained from "ipu3-imgu 3a stat"
> > +video node, which are then passed to user space for statistics analysis
> > +using :c:type:`v4l2_meta_format` interface.
> > +
> > +The statistics collected are AWB (Auto-white balance) RGBS cells, AWB filter

Just like you did with AWB, AF and AE, please place the full name in parenthesis
for RGBS and AWB.

> > +response, AF (Auto-focus) filter response, and AE (Auto-exposure) histogram.
> > +
> > +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for all above.
> > +
> > +
> > +.. code-block:: c
> > +
> > +
> > +     struct ipu3_uapi_stats_3a {
> > +	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;  
> 
> IPU3_ALIGN? What's that?
> 
> OK, after reading the header I see what it does, but I think you should
> drop it in the documentation since it doesn't help the reader.

Yeah, that IPU3_ALIGN is confusing.

Yet, instead of just dropping, I would replace it by a comment
to explain that the struct is 32-bytes aligned.

On a separate (but related) comment, you're declaring it as:

	#define IPU3_ALIGN	__attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))

This is a gcc-specific dialect. Better to use, instead, __aligned(x)
which is defined as:

#define __aligned(x)		__attribute__((aligned(x)))

> 
> > +	struct ipu3_uapi_ae_raw_buffer_aligned
> > +			ae_raw_buffer[IPU3_UAPI_MAX_STRIPES];
> > +	struct ipu3_uapi_af_raw_buffer af_raw_buffer;
> > +	struct ipu3_uapi_awb_fr_raw_buffer awb_fr_raw_buffer;
> > +	struct ipu3_uapi_4a_config stats_4a_config;
> > +	__u32 ae_join_buffers;
> > +	__u8 padding[28];
> > +	struct ipu3_uapi_stats_3a_bubble_info_per_stripe
> > +			stats_3a_bubble_per_stripe;
> > +	struct ipu3_uapi_ff_status stats_3a_status;
> > +     } __packed;
> > +
> > +
> > +.. c:type:: ipu3_uapi_params
> > +
> > +Pipeline parameters
> > +===================
> > +
> > +IPU3 pipeline has a number of image processing stages, each of which takes a
> > +set of parameters as input. The major stages of pipelines are shown here:
> > +
> > +Raw pixels -> Bayer Downscaling -> Optical Black Correction ->
> > +
> > +Linearization -> Lens Shading Correction -> White Balance / Exposure /
> > +
> > +Focus Apply -> Bayer Noise Reduction -> ANR -> Demosaicing -> Color
> > +
> > +Correction Matrix -> Gamma correction -> Color Space Conversion ->
> > +
> > +Chroma Down Scaling -> Chromatic Noise Reduction -> Total Color
> > +
> > +Correction -> XNR3 -> TNR -> DDR
> > +
> > +The table below presents a description of the above algorithms.
> > +
> > +======================== =======================================================
> > +Name			 Description
> > +======================== =======================================================
> > +Optical Black Correction Optical Black Correction block subtracts a pre-defined
> > +			 value from the respective pixel values to obtain better
> > +			 image quality.
> > +			 Defined in :c:type:`ipu3_uapi_obgrid_param`.
> > +Linearization		 This algo block uses linearization parameters to
> > +			 address non-linearity sensor effects. The Lookup table
> > +			 table is defined in
> > +			 :c:type:`ipu3_uapi_isp_lin_vmem_params`.
> > +SHD			 Lens shading correction is used to correct spatial
> > +			 non-uniformity of the pixel response due to optical
> > +			 lens shading. This is done by applying a different gain
> > +			 for each pixel. The gain, black level etc are
> > +			 configured in :c:type:`ipu3_uapi_shd_config_static`.
> > +BNR			 Bayer noise reduction block removes image noise by
> > +			 applying a bilateral filter.
> > +			 See :c:type:`ipu3_uapi_bnr_static_config` for details.
> > +ANR			 Advanced Noise Reduction is a block based algorithm
> > +			 that performs noise reduction in the Bayer domain. The
> > +			 convolution matrix etc can be found in
> > +			 :c:type:`ipu3_uapi_anr_config`.
> > +Demosaicing		 Demosaicing converts raw sensor data in Bayer format
> > +			 into RGB (Red, Green, Blue) presentation. Then add
> > +			 outputs of estimation of Y channel for following stream
> > +			 processing by Firmware. The struct is defined as
> > +			 :c:type:`ipu3_uapi_dm_config`.
> > +Color Correction	 Color Correction algo transforms sensor specific color
> > +			 space to the standard "sRGB" color space. This is done
> > +			 by applying 3x3 matrix defined in
> > +			 :c:type:`ipu3_uapi_ccm_mat_config`.
> > +Gamma correction	 Gamma correction :c:type:`ipu3_uapi_gamma_config` is a
> > +			 basic non-linear tone mapping correction that is
> > +			 applied per pixel for each pixel component.
> > +CSC			 Color space conversion transforms each pixel from the
> > +			 RGB primary presentation to YUV (Y - brightness,
> > +			 UV - Luminance) presentation. This is done by applying
> > +			 a 3x3 matrix defined in
> > +			 :c:type:`ipu3_uapi_csc_mat_config`
> > +CDS			 Chroma down sampling
> > +			 After the CSC is performed, the Chroma Down Sampling
> > +			 is applied for a UV plane down sampling by a factor
> > +			 of 2 in each direction for YUV 4:2:0 using a 4x2
> > +			 configurable filter :c:type:`ipu3_uapi_cds_params`.
> > +CHNR			 Chroma noise reduction
> > +			 This block processes only the chrominance pixels and
> > +			 performs noise reduction by cleaning the high
> > +			 frequency noise.
> > +			 See struct :c:type:`ipu3_uapi_yuvp1_chnr_config`.
> > +TCC			 Total color correction as defined in struct
> > +			 :c:type:`ipu3_uapi_yuvp2_tcc_static_config`.
> > +XNR3			 eXtreme Noise Reduction V3 is the third revision of
> > +			 noise reduction algorithm used to improve image
> > +			 quality. This removes the low frequency noise in the
> > +			 captured image. Two related structs are  being defined,
> > +			 :c:type:`ipu3_uapi_isp_xnr3_params` for ISP data memory
> > +			 and :c:type:`ipu3_uapi_isp_xnr3_vmem_params` for vector
> > +			 memory.
> > +TNR			 Temporal Noise Reduction block compares successive
> > +			 frames in time to remove anamolies / noise in pixel  
> 
> anamolies -> anomalies
> 
> > +			 values. :c:type:`ipu3_uapi_isp_tnr3_vmem_params` and
> > +			 :c:type:`ipu3_uapi_isp_tnr3_params` are defined for ISP
> > +			 vector and data memory respectively.  
> 
> Nice overview of all the blocks!
> 
> > +======================== =======================================================> +
> > +A few stages of the pipe will be executed by firmware running on the ISP  
> 
> pipe -> pipeline
> 
> > +processor, while many others will use a set of fixed hardware blocks also
> > +called accelerator cluster (ACC) to crunch pixel data and produce statistics.
> > +
> > +ACC parameters as defined by :c:type:`ipu3_uapi_acc_param`, can be selectively
> > +enabled / disabled by the user space through struct :c:type:`ipu3_uapi_flags`
> > +embedded in :c:type:`ipu3_uapi_params` structure.
> > +
> > +Both 3A statistics and pipeline parameters described here are closely tied to
> > +the underlying camera sub-system (CSS) APIs. They are usually consumed and
> > +produced by dedicated user space libraries that comprise the important tuning
> > +tools, thus freeing the developers from being bothered with the low level
> > +hardware and algorithm details.
> > +
> > +The meta data :c:type:`ipu3_uapi_params` will be sent to "ipu3-imgu parameters"
> > +video node in ``V4L2_BUF_TYPE_META_CAPTURE`` format.
> > +
> > +.. code-block:: c
> > +
> > +    struct ipu3_uapi_params {
> > +	/* Flags which of the settings below are to be applied */
> > +	IPU3_ALIGN struct ipu3_uapi_flags use;
> > +
> > +	/* Accelerator cluster parameters */
> > +	struct ipu3_uapi_acc_param acc_param;
> > +
> > +	/* ISP vector parameters */
> > +	struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
> > +	struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
> > +	struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
> > +
> > +	/* ISP data memory parameters */
> > +	struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
> > +	struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
> > +
> > +	/* Optical black level compensation */
> > +	struct ipu3_uapi_obgrid_param obgrid_param;
> > +    } __packed;
> > +
> > +Intel IPU3 ImgU uAPI data types
> > +===============================
> > +
> > +.. kernel-doc:: include/uapi/linux/intel-ipu3.h
> > diff --git a/include/uapi/linux/intel-ipu3.h b/include/uapi/linux/intel-ipu3.h
> > new file mode 100644
> > index 0000000..644c83f
> > --- /dev/null
> > +++ b/include/uapi/linux/intel-ipu3.h
> > @@ -0,0 +1,2816 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/* Copyright (C) 2017 - 2018 Intel Corporation */
> > +
> > +#ifndef __IPU3_UAPI_H
> > +#define __IPU3_UAPI_H
> > +
> > +#include <linux/bitmap.h>
> > +#include <linux/types.h>
> > +
> > +/********************* Key Acronyms *************************/
> > +/*
> > + * ACC - Accelerator cluster
> > + * ANR - Adaptive noise reduction
> > + * AWB_FR- Auto white balance filter response statistics
> > + * BNR - Bayer noise reduction parameters
> > + * BDS - Bayer downscaler parameters
> > + * CCM - Color correction matrix coefficients
> > + * CDS - Chroma down sample
> > + * CHNR - Chroma noise reduction
> > + * CSC - Color space conversion
> > + * DM - De-mosaic
> > + * IEFd - Image enhancement filter directed
> > + * Obgrid - Optical black level compensation
> > + * OSYS - Output system configuration
> > + * ROI - Region of interest
> > + * SHD - Lens shading correction table
> > + * TCC - Total color correction
> > + * YDS - Y down sampling
> > + * YTM - Y-tone mapping
> > + */
> > +
> > +#define IPU3_UAPI_ISP_WORD_BYTES			32
> > +#define IMGU_ABI_PAD	__aligned(IPU3_UAPI_ISP_WORD_BYTES)
> > +#define IPU3_ALIGN	__attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))  
> 
> That's weird. Isn't __aligned identical to __attribute__((aligned( ?
> If so, then these last two defines are also identical.

Yes, AFAIKT they're identical and __aligned() is the preferred form.

> 
> Why is it aligned to a 32 bytes? Is it a hardware requirement?
> 
> > +
> > +/******************* ipu3_uapi_stats_3a *******************/
> > +
> > +#define IPU3_UAPI_MAX_STRIPES				2
> > +#define IPU3_UAPI_MAX_BUBBLE_SIZE			10
> > +
> > +#define IPU3_UAPI_GRID_START_MASK			(BIT(12) - 1)
> > +#define IPU3_UAPI_GRID_Y_START_EN			BIT(15)
> > +
> > +/* controls generation of meta_data (like FF enable/disable) */
> > +#define IPU3_UAPI_AWB_RGBS_THR_B_EN			BIT(14)
> > +#define IPU3_UAPI_AWB_RGBS_THR_B_INCL_SAT		BIT(15)
> > +
> > +/**
> > + * struct ipu3_uapi_grid_config - Grid plane config
> > + *
> > + * @width:	Grid horizontal dimensions, in number of grid blocks(cells).
> > + * @height:	Grid vertical dimensions, in number of grid cells.
> > + * @block_width_log2:	Log2 of the width of each cell in pixels.
> > + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].

What are you meaning by [3, 7] here? From some comment you had later,
I guess you're meaning that only 3 or 7 are the valid values.

Yet, you're listing from 2^3 to 2^7, and that's confusing. Perhaps
you want to say, instead, that the valid values are at the 3..7 range?
If so, please use something like "values at the [3..7] range".

> > + * @block_height_log2:	Log2 of the height of each cell in pixels.
> > + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].

Same here.

> > + * @height_per_slice:	The number of blocks in vertical axis per slice.
> > + *			Default 2.
> > + * @x_start: X value of top left corner of Region of Interest(ROI).
> > + * @y_start: Y value of top left corner of ROI
> > + * @x_end: X value of bottom right corner of ROI
> > + * @y_end: Y value of bottom right corner of ROI
> > + *
> > + * Due to the size of total amount of collected data, most statistics
> > + * create a grid-based output, and the data is then divided into "slices".
> > + */
> > +struct ipu3_uapi_grid_config {
> > +	__u8 width;
> > +	__u8 height;
> > +	__u16 block_width_log2:3;
> > +	__u16 block_height_log2:3;
> > +	__u16 height_per_slice:8;
> > +	__u16 x_start;
> > +	__u16 y_start;
> > +	__u16 x_end;
> > +	__u16 y_end;
> > +} __packed;
> > +
> > +/*
> > + * The grid based data is divided into "slices" called set, each slice of setX
> > + * refers to ipu3_uapi_grid_config width * height_per_slice.
> > + */
> > +#define IPU3_UAPI_AWB_MAX_SETS				60
> > +#define IPU3_UAPI_AWB_SET_SIZE				0x500
> > +#define IPU3_UAPI_AWB_MD_ITEM_SIZE			8
> > +#define IPU3_UAPI_AWB_SPARE_FOR_BUBBLES \
> > +	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
> > +	 IPU3_UAPI_AWB_MD_ITEM_SIZE)
> > +#define IPU3_UAPI_AWB_MAX_BUFFER_SIZE \
> > +	(IPU3_UAPI_AWB_MAX_SETS * \
> > +	 (IPU3_UAPI_AWB_SET_SIZE + IPU3_UAPI_AWB_SPARE_FOR_BUBBLES))
> > +/**
> > + * struct ipu3_uapi_awb_meta_data - AWB meta data
> > + *
> > + * @meta_data_buffer:	Average values for each color channel
> > + */
> > +struct ipu3_uapi_awb_meta_data {
> > +	__u8 meta_data_buffer[IPU3_UAPI_AWB_MAX_BUFFER_SIZE];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_awb_raw_buffer - AWB raw buffer
> > + *
> > + * @meta_data: buffer to hold auto white balance meta data.
> > + */
> > +struct ipu3_uapi_awb_raw_buffer {
> > +	struct ipu3_uapi_awb_meta_data meta_data;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_awb_config_s - AWB config
> > + *
> > + * @rgbs_thr_gr: gr threshold value.
> > + * @rgbs_thr_r: Red threshold value.
> > + * @rgbs_thr_gb: gb threshold value.
> > + * @rgbs_thr_b: Blue threshold value.
> > + * @grid: &ipu3_uapi_grid_config, the default grid resolution is 16x16 cells.
> > + *
> > + * The threshold is a saturation measure range [0..8191], 8191 is default.
> > + * Values over threshold may be optionally rejected for averaging.
> > + */
> > +struct ipu3_uapi_awb_config_s {
> > +	__u16 rgbs_thr_gr;
> > +	__u16 rgbs_thr_r;
> > +	__u16 rgbs_thr_gb;
> > +	__u16 rgbs_thr_b;
> > +	struct ipu3_uapi_grid_config grid;
> > +} IPU3_ALIGN __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_awb_config - AWB config wrapper
> > + *
> > + * @config: config for auto white balance as defined by &ipu3_uapi_awb_config_s
> > + */
> > +struct ipu3_uapi_awb_config {
> > +	IPU3_ALIGN struct ipu3_uapi_awb_config_s config;
> > +} __packed;
> > +
> > +#define IPU3_UAPI_AE_COLORS				4	/* R, G, B, Y */
> > +#define IPU3_UAPI_AE_BINS				256
> > +#define IPU3_UAPI_AE_WEIGHTS				96
> > +
> > +/**
> > + * struct ipu3_uapi_ae_raw_buffer - AE global weighted histogram
> > + *
> > + * @vals: Sum of IPU3_UAPI_AE_COLORS in cell
> > + *
> > + * Each histogram contains IPU3_UAPI_AE_BINS bins. Each bin has 24 bit unsigned
> > + * for counting the number of the pixel.
> > + */
> > +struct ipu3_uapi_ae_raw_buffer {
> > +	__u32 vals[IPU3_UAPI_AE_BINS * IPU3_UAPI_AE_COLORS];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_ae_raw_buffer_aligned - AE raw buffer
> > + *
> > + * @buff: &ipu3_uapi_ae_raw_buffer to hold full frame meta data.
> > + */
> > +struct ipu3_uapi_ae_raw_buffer_aligned {
> > +	IPU3_ALIGN struct ipu3_uapi_ae_raw_buffer buff;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_ae_grid_config - AE weight grid
> > + *
> > + * @width: Grid horizontal dimensions. Value: [16,32], default 16.

if [16,32] is a range, please use [16..32]. If only 16 or 32 are
valid values, please say something like:

	Value: 16 or 32. Defaults to 16.

Same to other places.

> > + * @height: Grid vertical dimensions. Value: [16,24], default 16.

Same here.

> > + * @block_width_log2: Log2 of the width of the grid cell, 2^3 = 16.
> > + * @block_height_log2: Log2 of the height of the grid cell, 2^3 = 16.
> > + * @__reserved0: reserved
> > + * @ae_en: 0: does not write to meta-data array, 1: write normally.
> > + * @rst_hist_array: write 1 to trigger histogram array reset.
> > + * @done_rst_hist_array: flag for histogram array reset done.
> > + * @x_start: X value of top left corner of ROI, default 0.
> > + * @y_start: Y value of top left corner of ROI, default 0.
> > + * @x_end: X value of bottom right corner of ROI
> > + * @y_end: Y value of bottom right corner of ROI
> > + *
> > + * The AE block accumulates 4 global weighted histograms(R, G, B, Y) over
> > + * a defined ROI within the frame. The contribution of each pixel into the
> > + * histogram, defined by &ipu3_uapi_ae_weight_elem LUT, is indexed by a grid.
> > + */
> > +struct ipu3_uapi_ae_grid_config {
> > +	__u8 width;
> > +	__u8 height;
> > +	__u8 block_width_log2:4;
> > +	__u8 block_height_log2:4;
> > +	__u8 __reserved0:5;  
> 
> Why add a reserved bitfield? What is its purpose?
> > +	__u8 ae_en:1;
> > +	__u8 rst_hist_array:1;
> > +	__u8 done_rst_hist_array:1;
> > +	__u16 x_start;
> > +	__u16 y_start;
> > +	__u16 x_end;
> > +	__u16 y_end;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_ae_weight_elem - AE weights LUT
> > + *
> > + * @cell0: weighted histogram grid value.
> > + * @cell1: weighted histogram grid value.
> > + * @cell2: weighted histogram grid value.
> > + * @cell3: weighted histogram grid value.
> > + * @cell4: weighted histogram grid value.
> > + * @cell5: weighted histogram grid value.
> > + * @cell6: weighted histogram grid value.
> > + * @cell7: weighted histogram grid value.
> > + *
> > + * Use weighted grid value to give a different contribution factor to each cell.
> > + */
> > +struct ipu3_uapi_ae_weight_elem {
> > +	__u32 cell0:4;
> > +	__u32 cell1:4;
> > +	__u32 cell2:4;
> > +	__u32 cell3:4;
> > +	__u32 cell4:4;
> > +	__u32 cell5:4;
> > +	__u32 cell6:4;
> > +	__u32 cell7:4;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_ae_ccm - AE coefficients for WB and CCM
> > + *
> > + * @gain_gr: WB gain factor for the gr channels. Default 256.
> > + * @gain_r: WB gain factor for the r channel. Default 256.
> > + * @gain_b: WB gain factor for the b channel. Default 256.
> > + * @gain_gb: WB gain factor for the gb channels. Default 256.
> > + * @mat: 4x4 matrix that transforms Bayer quad output from WB to RGB+Y.
> > + *
> > + * Default:
> > + *	128, 0, 0, 0,
> > + *	0, 128, 0, 0,
> > + *	0, 0, 128, 0,
> > + *	0, 0, 0, 128,
> > + *
> > + * As part of the raw frame pre-process stage, the WB and color conversion need
> > + * to be applied to expose the impact of these gain operations.
> > + */
> > +struct ipu3_uapi_ae_ccm {
> > +	__u16 gain_gr;
> > +	__u16 gain_r;
> > +	__u16 gain_b;
> > +	__u16 gain_gb;
> > +	__s16 mat[16];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_ae_config - AE config
> > + *
> > + * @grid_cfg:	config for auto exposure statistics grid. See struct
> > + *		&ipu3_uapi_ae_grid_config
> > + * @weights:	&IPU3_UAPI_AE_WEIGHTS is based on 32x24 blocks in the grid.
> > + *		Each grid cell has a corresponding value in weights LUT called
> > + *		grid value, global histogram is updated based on grid value and
> > + *		pixel value.
> > + * @ae_ccm:	Color convert matrix pre-processing block.
> > + *
> > + * Calculate AE grid from image resolution, resample ae weights.
> > + */
> > +struct ipu3_uapi_ae_config {
> > +	IPU3_ALIGN struct ipu3_uapi_ae_grid_config grid_cfg;
> > +	IPU3_ALIGN struct ipu3_uapi_ae_weight_elem weights[
> > +						IPU3_UAPI_AE_WEIGHTS];
> > +	IPU3_ALIGN struct ipu3_uapi_ae_ccm ae_ccm;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_af_filter_config - AF 2D filter for contrast measurements
> > + *
> > + * @y1_coeff_0:	filter Y1, structure: 3x11, support both symmetry and
> > + *		anti-symmetry type. A12 is center, A1-A11 are neighbours.
> > + *		for analyzing low frequency content, used to calculate sum
> > + *		of gradients in x direction.
> > + * @y1_coeff_0.a1:	filter1 coefficients A1, default 0.
> > + * @y1_coeff_0.a2:	filter1 coefficients A2, default 0.
> > + * @y1_coeff_0.a3:	filter1 coefficients A3, default 0.
> > + * @y1_coeff_0.a4:	filter1 coefficients A4, default 0.
> > + * @y1_coeff_1:		Struct
> > + * @y1_coeff_1.a5:	filter1 coefficients A5, default 0.
> > + * @y1_coeff_1.a6:	filter1 coefficients A6, default 0.
> > + * @y1_coeff_1.a7:	filter1 coefficients A7, default 0.
> > + * @y1_coeff_1.a8:	filter1 coefficients A8, default 0.
> > + * @y1_coeff_2:		Struct
> > + * @y1_coeff_2.a9:	filter1 coefficients A9, default 0.
> > + * @y1_coeff_2.a10:	filter1 coefficients A10, default 0.
> > + * @y1_coeff_2.a11:	filter1 coefficients A11, default 0.
> > + * @y1_coeff_2.a12:	filter1 coefficients A12, default 128.
> > + * @y1_sign_vec:	Each bit corresponds to one coefficient sign bit,
> > + *			0: positive, 1: negative, default 0.
> > + * @y2_coeff_0:	Y2, same structure as Y1. For analyzing high frequency content.
> > + * @y2_coeff_0.a1:	filter2 coefficients A1, default 0.
> > + * @y2_coeff_0.a2:	filter2 coefficients A2, default 0.
> > + * @y2_coeff_0.a3:	filter2 coefficients A3, default 0.
> > + * @y2_coeff_0.a4:	filter2 coefficients A4, default 0.
> > + * @y2_coeff_1:	Struct
> > + * @y2_coeff_1.a5:	filter2 coefficients A5, default 0.
> > + * @y2_coeff_1.a6:	filter2 coefficients A6, default 0.
> > + * @y2_coeff_1.a7:	filter2 coefficients A7, default 0.
> > + * @y2_coeff_1.a8:	filter2 coefficients A8, default 0.
> > + * @y2_coeff_2:	Struct
> > + * @y2_coeff_2.a9:	filter1 coefficients A9, default 0.
> > + * @y2_coeff_2.a10:	filter1 coefficients A10, default 0.
> > + * @y2_coeff_2.a11:	filter1 coefficients A11, default 0.
> > + * @y2_coeff_2.a12:	filter1 coefficients A12, default 128.
> > + * @y2_sign_vec:	Each bit corresponds to one coefficient sign bit,
> > + *			0: positive, 1: negative, default 0.
> > + * @y_calc:	Pre-processing that converts Bayer quad to RGB+Y values to be
> > + *		used for building histogram. Range [0..32], default 8.
> > + * Rule:
> > + *		y_gen_rate_gr + y_gen_rate_r + y_gen_rate_b + y_gen_rate_gb = 32
> > + *		A single Y is calculated based on sum of Gr/R/B/Gb based on
> > + *		their contribution ratio.
> > + * @y_calc.y_gen_rate_gr:	Contribution ratio Gr for Y
> > + * @y_calc.y_gen_rate_r:	Contribution ratio R for Y
> > + * @y_calc.y_gen_rate_b:	Contribution ratio B for Y
> > + * @y_calc.y_gen_rate_gb:	Contribution ratio Gb for Y
> > + * @nf:	The shift right value that should be applied during the Y1/Y2 filter to
> > + *	make sure the total memory needed is 2 bytes per grid cell.
> > + * @nf.__reserved0:	reserved
> > + * @nf.y1_nf:	Normalization factor for the convolution coeffs of y1,
> > + *		should be log2 of the sum of the abs values of the filter
> > + *		coeffs, default 7 (2^7 = 128).
> > + * @nf.__reserved1:	reserved
> > + * @nf.y2_nf:	Normalization factor for y2, should be log2 of the sum of the
> > + *		abs values of the filter coeffs.
> > + * @nf.__reserved2:	reserved
> > + */
> > +struct ipu3_uapi_af_filter_config {
> > +	struct {
> > +		__u8 a1;
> > +		__u8 a2;
> > +		__u8 a3;
> > +		__u8 a4;
> > +	} y1_coeff_0;
> > +	struct {
> > +		__u8 a5;
> > +		__u8 a6;
> > +		__u8 a7;
> > +		__u8 a8;
> > +	} y1_coeff_1;
> > +	struct {
> > +		__u8 a9;
> > +		__u8 a10;
> > +		__u8 a11;
> > +		__u8 a12;
> > +	} y1_coeff_2;
> > +
> > +	__u32 y1_sign_vec;
> > +
> > +	struct {
> > +		__u8 a1;
> > +		__u8 a2;
> > +		__u8 a3;
> > +		__u8 a4;
> > +	} y2_coeff_0;
> > +	struct {
> > +		__u8 a5;
> > +		__u8 a6;
> > +		__u8 a7;
> > +		__u8 a8;
> > +	} y2_coeff_1;
> > +	struct {
> > +		__u8 a9;
> > +		__u8 a10;
> > +		__u8 a11;
> > +		__u8 a12;
> > +	} y2_coeff_2;
> > +
> > +	__u32 y2_sign_vec;
> > +
> > +	struct {
> > +		__u8 y_gen_rate_gr;
> > +		__u8 y_gen_rate_r;
> > +		__u8 y_gen_rate_b;
> > +		__u8 y_gen_rate_gb;
> > +	} y_calc;
> > +
> > +	struct {
> > +		__u32 __reserved0:8;
> > +		__u32 y1_nf:4;
> > +		__u32 __reserved1:4;
> > +		__u32 y2_nf:4;
> > +		__u32 __reserved2:12;
> > +	} nf;
> > +} __packed;
> > +
> > +#define IPU3_UAPI_AF_MAX_SETS				24
> > +#define IPU3_UAPI_AF_MD_ITEM_SIZE			4
> > +#define IPU3_UAPI_AF_SPARE_FOR_BUBBLES \
> > +	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
> > +	 IPU3_UAPI_AF_MD_ITEM_SIZE)
> > +#define IPU3_UAPI_AF_Y_TABLE_SET_SIZE			0x80
> > +#define IPU3_UAPI_AF_Y_TABLE_MAX_SIZE \
> > +	(IPU3_UAPI_AF_MAX_SETS * \
> > +	 (IPU3_UAPI_AF_Y_TABLE_SET_SIZE + IPU3_UAPI_AF_SPARE_FOR_BUBBLES) * \
> > +	 IPU3_UAPI_MAX_STRIPES)
> > +
> > +/**
> > + * struct ipu3_uapi_af_meta_data - AF meta data
> > + *
> > + * @y_table:	Each color component will be convolved separately with filter1
> > + *		and filter2 and the result will be summed out and averaged for
> > + *		each cell.
> > + */
> > +struct ipu3_uapi_af_meta_data {
> > +	__u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN;  
> 
> Here IPU3_ALIGN is put at the end...
> 
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_af_raw_buffer - AF raw buffer
> > + *
> > + * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus meta data.
> > + */
> > +struct ipu3_uapi_af_raw_buffer {
> > +	IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data;  
> 
> ... and here at the start. Is that due to the difference between an array and a struct?

If placing it at the end works (I guess it works for structs), I would
prefer it always at the end.

Btw, IMO, I would, instead be doing something like:

	#define IPU3_ALIGN	32

(e. g. some short name - IPU3_UAPI_ISP_WORD_BYTES is too big to my taste :-) )

and replace all occurrences of it by:

	IPU3_ALIGN -> __aligned(IPU3_ALIGN)

That would make it a way easier to read and review.

> 
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_af_config_s - AF config
> > + *
> > + * @filter_config: AF uses Y1 and Y2 filters as configured in
> > + *		   &ipu3_uapi_af_filter_config
> > + * @padding: paddings
> > + * @grid_cfg: See &ipu3_uapi_grid_config, default resolution 16x16. Use large
> > + *	      grid size for large image and vice versa.
> > + */
> > +struct ipu3_uapi_af_config_s {
> > +	IPU3_ALIGN struct ipu3_uapi_af_filter_config filter_config;
> > +	__u8 padding[4];  
> 
> Is the padding still needed with the IPU3_ALIGNs?
> 
> > +	IPU3_ALIGN struct ipu3_uapi_grid_config grid_cfg;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_af_config - AF config wrapper
> > + *
> > + * @config: config for auto focus as defined by &ipu3_uapi_af_config_s
> > + */
> > +struct ipu3_uapi_af_config {
> > +	struct ipu3_uapi_af_config_s config;
> > +} __packed;
> > +
> > +#define IPU3_UAPI_AWB_FR_MAX_SETS			24
> > +#define IPU3_UAPI_AWB_FR_MD_ITEM_SIZE			8
> > +#define IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE			0x100
> > +#define IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES \
> > +	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
> > +	 IPU3_UAPI_AWB_FR_MD_ITEM_SIZE)
> > +#define IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE \
> > +	(IPU3_UAPI_AWB_FR_MAX_SETS * \
> > +	(IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE + \
> > +	 IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES) * IPU3_UAPI_MAX_STRIPES)  
> 
> Add newline
> 
> > +/**
> > + * struct ipu3_uapi_awb_fr_meta_data - AWB filter response meta data
> > + *
> > + * @bayer_table: Statistics output on the grid after convolving with 1D filter.
> > + */
> > +struct ipu3_uapi_awb_fr_meta_data {
> > +	IPU3_ALIGN __u8 bayer_table[IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_awb_fr_raw_buffer - AWB filter response raw buffer
> > + *
> > + * @meta_data: See &ipu3_uapi_awb_fr_meta_data.
> > + */
> > +struct ipu3_uapi_awb_fr_raw_buffer {
> > +	struct ipu3_uapi_awb_fr_meta_data meta_data;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_awb_fr_config_s - AWB filter response config
> > + *
> > + * @grid_cfg:	grid config, default 16x16.
> > + * @bayer_coeff:	1D Filter 1x11 center symmetry/anti-symmetry.
> > + *			coeffcients defaults { 0, 0, 0, 0, 0, 128 }.
> > + *			Applied on whole image for each Bayer channel separately
> > + *			by a weighted sum of its 11x1 neighbors.
> > + * @__reserved1:	reserved
> > + * @bayer_sign:	sign of filter coeffcients, default 0.
> > + * @bayer_nf:	normalization factor for the convolution coeffs, to make sure
> > + *		total memory needed is within pre-determined range.
> > + *		NF should be the log2 of the sum of the abs values of the
> > + *		filter coeffs, range [7..14], default 7.
> > + * @__reserved2:	reserved
> > + */
> > +struct ipu3_uapi_awb_fr_config_s {
> > +	struct ipu3_uapi_grid_config grid_cfg;
> > +	__u8 bayer_coeff[6];
> > +	__u16 __reserved1;
> > +	__u32 bayer_sign;
> > +	__u8 bayer_nf;
> > +	__u8 __reserved2[3];
> > +} IPU3_ALIGN __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_awb_fr_config - AWB filter response config wrapper
> > + *
> > + * @config:	See &ipu3_uapi_awb_fr_config_s.
> > + */
> > +struct ipu3_uapi_awb_fr_config {
> > +	struct ipu3_uapi_awb_fr_config_s config;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_4a_config - 4A config
> > + *
> > + * @awb_config: &ipu3_uapi_awb_config_s, default resolution 16x16
> > + * @ae_grd_config: auto exposure statistics &ipu3_uapi_ae_grid_config
> > + * @padding: paddings
> > + * @af_config: auto focus config &ipu3_uapi_af_config_s
> > + * @awb_fr_config: &ipu3_uapi_awb_fr_config_s, default resolution 16x16
> > + */
> > +struct ipu3_uapi_4a_config {
> > +	IPU3_ALIGN struct ipu3_uapi_awb_config_s awb_config;
> > +	struct ipu3_uapi_ae_grid_config ae_grd_config;
> > +	__u8 padding[20];  
> 
> Can 'padding' be replaced by IPU3_ALIGN?
> 
> > +	struct ipu3_uapi_af_config_s af_config;
> > +	struct ipu3_uapi_awb_fr_config_s awb_fr_config;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bubble_info - Bubble info for host side debugging
> > + *
> > + * @num_of_stripes: A single frame is divided into several parts called stripes
> > + *		    due to limitation on line buffer memory.
> > + *		    The separation between the stripes is vertical. Each such
> > + *		    stripe is processed as a single frame by the ISP pipe.
> > + * @padding: padding bytes.
> > + * @num_sets: number of sets.
> > + * @padding1: padding bytes.
> > + * @size_of_set: set size.
> > + * @padding2: padding bytes.
> > + * @bubble_size: is the amount of padding in the bubble expressed in “sets”.
> > + * @padding3: padding bytes.
> > + */
> > +struct ipu3_uapi_bubble_info {
> > +	IPU3_ALIGN __u32 num_of_stripes;
> > +	__u8 padding[28];
> > +	__u32 num_sets;
> > +	__u8 padding1[28];
> > +	__u32 size_of_set;
> > +	__u8 padding2[28];
> > +	__u32 bubble_size;
> > +	__u8 padding3[28];  
> 
> Same question here and elsewhere.
> 
> > +} __packed;
> > +
> > +/*
> > + * struct ipu3_uapi_stats_3a_bubble_info_per_stripe
> > + */
> > +struct ipu3_uapi_stats_3a_bubble_info_per_stripe {
> > +	struct ipu3_uapi_bubble_info awb[IPU3_UAPI_MAX_STRIPES];
> > +	struct ipu3_uapi_bubble_info af[IPU3_UAPI_MAX_STRIPES];
> > +	struct ipu3_uapi_bubble_info awb_fr[IPU3_UAPI_MAX_STRIPES];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_ff_status - Enable bits for each 3A fixed function
> > + *
> > + * @awb_en: auto white balance enable
> > + * @padding: padding config
> > + * @ae_en: auto exposure enable
> > + * @padding1: padding config
> > + * @af_en: auto focus enable
> > + * @padding2: padding config
> > + * @awb_fr_en: awb filter response enable bit
> > + * @padding3: padding config
> > + */
> > +struct ipu3_uapi_ff_status {
> > +	IPU3_ALIGN __u32 awb_en;
> > +	__u8 padding[28];
> > +	__u32 ae_en;
> > +	__u8 padding1[28];
> > +	__u32 af_en;
> > +	__u8 padding2[28];
> > +	__u32 awb_fr_en;
> > +	__u8 padding3[28];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_stats_3a - 3A statistics
> > + *
> > + * @awb_raw_buffer: auto white balance meta data &ipu3_uapi_awb_raw_buffer
> > + * @ae_raw_buffer: auto exposure raw data &ipu3_uapi_ae_raw_buffer_aligned
> > + * @af_raw_buffer: &ipu3_uapi_af_raw_buffer for auto focus meta data
> > + * @awb_fr_raw_buffer: value as specified by &ipu3_uapi_awb_fr_raw_buffer
> > + * @stats_4a_config: 4a statistics config as defined by &ipu3_uapi_4a_config.
> > + * @ae_join_buffers: 1 to use ae_raw_buffer.
> > + * @padding: padding config
> > + * @stats_3a_bubble_per_stripe: a &ipu3_uapi_stats_3a_bubble_info_per_stripe
> > + * @stats_3a_status: 3a statistics status set in &ipu3_uapi_ff_status
> > + */
> > +struct ipu3_uapi_stats_3a {
> > +	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> > +	struct ipu3_uapi_ae_raw_buffer_aligned
> > +			ae_raw_buffer[IPU3_UAPI_MAX_STRIPES];
> > +	struct ipu3_uapi_af_raw_buffer af_raw_buffer;
> > +	struct ipu3_uapi_awb_fr_raw_buffer awb_fr_raw_buffer;
> > +	struct ipu3_uapi_4a_config stats_4a_config;
> > +	__u32 ae_join_buffers;
> > +	__u8 padding[28];
> > +	struct ipu3_uapi_stats_3a_bubble_info_per_stripe
> > +			stats_3a_bubble_per_stripe;
> > +	struct ipu3_uapi_ff_status stats_3a_status;
> > +} __packed;
> > +
> > +/******************* ipu3_uapi_acc_param *******************/
> > +
> > +#define IPU3_UAPI_ISP_VEC_ELEMS				64
> > +#define IPU3_UAPI_ISP_TNR3_VMEM_LEN			9
> > +
> > +#define IPU3_UAPI_BNR_LUT_SIZE				32
> > +
> > +/* number of elements in gamma correction LUT */
> > +#define IPU3_UAPI_GAMMA_CORR_LUT_ENTRIES		256
> > +
> > +/* largest grid is 73x56, for grid_height_per_slice of 2, 73x2 = 146 */
> > +#define IPU3_UAPI_SHD_MAX_CELLS_PER_SET			146
> > +#define IPU3_UAPI_SHD_MAX_CFG_SETS			28
> > +/* Normalization shift aka nf */
> > +#define IPU3_UAPI_SHD_BLGR_NF_SHIFT			13
> > +#define IPU3_UAPI_SHD_BLGR_NF_MASK			0x7
> > +
> > +#define IPU3_UAPI_YUVP2_TCC_MACC_TABLE_ELEMENTS		16
> > +#define IPU3_UAPI_YUVP2_TCC_INV_Y_LUT_ELEMENTS		14
> > +#define IPU3_UAPI_YUVP2_TCC_GAIN_PCWL_LUT_ELEMENTS	258
> > +#define IPU3_UAPI_YUVP2_TCC_R_SQR_LUT_ELEMENTS		24
> > +
> > +#define IPU3_UAPI_ANR_LUT_SIZE				26
> > +#define IPU3_UAPI_ANR_PYRAMID_SIZE			22
> > +#define IPU3_UAPI_ANR_MAX_XRESET			(BIT(12) - 1)
> > +
> > +#define IPU3_UAPI_LIN_LUT_SIZE				64
> > +
> > +/* Bayer Noise Reduction related structs */
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_wb_gains_config - White balance gains
> > + *
> > + * @gr:	white balance gain for Gr channel.
> > + * @r:	white balance gain for R channel.
> > + * @b:	white balance gain for B channel.
> > + * @gb:	white balance gain for Gb channel.
> > + *
> > + * Precision u3.13, range [0,8). White balance correction is done by applying
> > + * a multiplicative gain to each color channels prior to BNR.
> > + */
> > +struct ipu3_uapi_bnr_static_config_wb_gains_config {
> > +	__u16 gr;
> > +	__u16 r;
> > +	__u16 b;
> > +	__u16 gb;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_wb_gains_thr_config - Threshold config
> > + *
> > + * @gr:	white balance threshold gain for Gr channel.
> > + * @r:	white balance threshold gain for R channel.
> > + * @b:	white balance threshold gain for B channel.
> > + * @gb:	white balance threshold gain for Gb channel.
> > + *
> > + * Defines the threshold that specifies how different a defect pixel can be from
> > + * its neighbors.(used by dynamic defect pixel correction sub block)
> > + * Precision u4.4 range [0,8).
> > + */
> > +struct ipu3_uapi_bnr_static_config_wb_gains_thr_config {
> > +	__u8 gr;
> > +	__u8 r;
> > +	__u8 b;
> > +	__u8 gb;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_thr_coeffs_config - Noise model
> > + *				coefficients that controls noise threshold
> > + *
> > + * @cf:	Free coefficient for threshold calculation, range [0..8191], default 0.
> > + * @__reserved0:	reserved
> > + * @cg:	Gain coefficient for threshold calculation, [0..31], default 8.
> > + * @ci:	Intensity coefficient for threshold calculation. u3.2, range [0..7.75]

hmm... 7.75??? ci is an _u32 with 5 bits... it can't be a floating point value!

also, what do you mean by u3.2?

> > + *	default 6.
> > + * @__reserved1:	reserved
> > + * @r_nf:	Normalization shift value for r^2 calculation, range [12 .. 20]
> > + *		where r is a radius of pixel [row, col] from centor of sensor.
> > + *		default 14.
> > + *
> > + * Threshold used to distinguish between noise and details.
> > + */
> > +struct ipu3_uapi_bnr_static_config_thr_coeffs_config {
> > +	__u32 cf:13;
> > +	__u32 __reserved0:3;
> > +	__u32 cg:5;
> > +	__u32 ci:5;
> > +	__u32 __reserved1:1;
> > +	__u32 r_nf:5;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config - Shading config
> > + *
> > + * @gr:	Coefficient defines lens shading gain approximation for gr channel
> > + * @r:	Coefficient defines lens shading gain approximation for r channel
> > + * @b:	Coefficient defines lens shading gain approximation for b channel
> > + * @gb:	Coefficient defines lens shading gain approximation for gb channel
> > + *
> > + * Parameters for noise model (NM) adaptation of BNR due to shading correction.
> > + * All above have precision of u3.3, default to 0.
> > + */
> > +struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config {
> > +	__u8 gr;
> > +	__u8 r;
> > +	__u8 b;
> > +	__u8 gb;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_opt_center_config - Optical center config
> > + *
> > + * @x_reset:	Reset value of X (col start - X center). Precision s12.0.
> > + * @__reserved0:	reserved
> > + * @y_reset:	Reset value of Y (row start - Y center). Precision s12.0.
> > + * @__reserved2:	reserved
> > + *
> > + * Distance from corner to optical center for NM adaptation due to shading
> > + * correction (should be calculated based on shading tables)
> > + */
> > +struct ipu3_uapi_bnr_static_config_opt_center_config {
> > +	__s32 x_reset:13;
> > +	__u32 __reserved0:3;
> > +	__s32 y_reset:13;
> > +	__u32 __reserved2:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_lut_config - BNR square root lookup table
> > + *
> > + * @values: pre-calculated values of square root function.
> > + *
> > + * LUT implementation of square root operation.
> > + */
> > +struct ipu3_uapi_bnr_static_config_lut_config {
> > +	__u8 values[IPU3_UAPI_BNR_LUT_SIZE];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_bp_ctrl_config - Detect bad pixels (bp)
> > + *
> > + * @bp_thr_gain:	Defines the threshold that specifies how different a
> > + *			defect pixel can be from its neighbors. Threshold is
> > + *			dependent on de-noise threshold calculated by algorithm.
> > + *			Range [4..31], default 4.
> > + * @__reserved0:	reserved
> > + * @defect_mode:	Mode of addressed defect pixels,
> > + *			0 – single defect pixel is expected,
> > + *			1 - 2 adjacent defect pixels are expected, default 1.
> > + * @bp_gain:	Defines how 2nd derivation that passes through a defect pixel
> > + *		is different from 2nd derivations that pass through
> > + *		neighbor pixels. u4.2, range [0-256), default 8.
> > + * @__reserved1:	reserved
> > + * @w0_coeff:	Blending coefficient of defect pixel correction.
> > + *		Precision u4, range [0..8], default 8.
> > + * @__reserved2:	reserved
> > + * @w1_coeff:	Enable influence of incorrect defect pixel correction to be
> > + *		avoided. Precision u4, range [1..8], default 8.
> > + * @__reserved3:	reserved
> > + */
> > +struct ipu3_uapi_bnr_static_config_bp_ctrl_config {
> > +	__u32 bp_thr_gain:5;
> > +	__u32 __reserved0:2;
> > +	__u32 defect_mode:1;
> > +	__u32 bp_gain:6;
> > +	__u32 __reserved1:18;
> > +	__u32 w0_coeff:4;
> > +	__u32 __reserved2:4;
> > +	__u32 w1_coeff:4;
> > +	__u32 __reserved3:20;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config - Denoising config
> > + *
> > + * @alpha:	Weight of central element of smoothing filter.
> > + * @beta:	Weight of peripheral elements of smoothing filter, default 4.
> > + * @gamma:	Weight of diagonal elements of smoothing filter, default 4.
> > + *
> > + * beta and gamma parameter define the strength of the noise removal filter.
> > + * All above has precision u0.4, range [0..0xF].

again, what do you mean by u0.4? For hexadecimal values (here and everywhere)
please prefer lowecase.

> > + *
> > + * @__reserved0:	reserved
> > + * @max_inf:	Maximum increase of peripheral or diagonal element influence
> > + *		relative to the pre-defined value range: [0x5..0xA]
> > + * @__reserved1:	reserved
> > + * @gd_enable:	Green disparity enable control, 0 - disable, 1 - enable.
> > + * @bpc_enable:	Bad pixel correction enable control, 0 - disable, 1 - enable.
> > + * @bnr_enable:	Bayer noise removal enable control, 0 - disable, 1 - enable.
> > + * @ff_enable:	Fixed function enable, 0 - disable, 1 - enable.
> > + * @__reserved2:	reserved
> > + */
> > +struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config {
> > +	__u32 alpha:4;
> > +	__u32 beta:4;
> > +	__u32 gamma:4;
> > +	__u32 __reserved0:4;
> > +	__u32 max_inf:4;
> > +	__u32 __reserved1:7;
> > +	__u32 gd_enable:1;
> > +	__u32 bpc_enable:1;
> > +	__u32 bnr_enable:1;
> > +	__u32 ff_enable:1;
> > +	__u32 __reserved2:1;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_opt_center_sqr_config - BNR optical square
> > + *
> > + * @x_sqr_reset: Reset value of X^2.
> > + * @y_sqr_reset: Reset value of Y^2.
> > + *
> > + * Please note:
> > + *
> > + *    #. X and Y ref to
> > + *       &ipu3_uapi_bnr_static_config_opt_center_config
> > + *    #. Both structs are used in threshold formula to calculate r^2, where r
> > + *       is a radius of pixel [row, col] from centor of sensor.
> > + */
> > +struct ipu3_uapi_bnr_static_config_opt_center_sqr_config {
> > +	__u32 x_sqr_reset;
> > +	__u32 y_sqr_reset;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config - BNR static config
> > + *
> > + * @wb_gains:	white balance gains &ipu3_uapi_bnr_static_config_wb_gains_config
> > + * @wb_gains_thr:	white balance gains threshold as defined by
> > + *			&ipu3_uapi_bnr_static_config_wb_gains_thr_config
> > + * @thr_coeffs:	coefficients of threshold
> > + *		&ipu3_uapi_bnr_static_config_thr_coeffs_config
> > + * @thr_ctrl_shd:	control of shading threshold
> > + *			&ipu3_uapi_bnr_static_config_thr_ctrl_shd_config
> > + * @opt_center:	optical center &ipu3_uapi_bnr_static_config_opt_center_config
> > + *
> > + * Above parameters and opt_center_sqr are used for white balance and shading.
> > + *
> > + * @lut:	lookup table &ipu3_uapi_bnr_static_config_lut_config
> > + * @bp_ctrl:	detect and remove bad pixels as defined in struct
> > + *		&ipu3_uapi_bnr_static_config_bp_ctrl_config
> > + * @dn_detect_ctrl:	detect and remove noise.
> > + *			&ipu3_uapi_bnr_static_config_dn_detect_ctrl_config
> > + * @column_size:	The number of pixels in column.
> > + * @opt_center_sqr:	Reset value of r^2 to optical center, see
> > + *			&ipu3_uapi_bnr_static_config_opt_center_sqr_config.
> > + */
> > +struct ipu3_uapi_bnr_static_config {
> > +	struct ipu3_uapi_bnr_static_config_wb_gains_config wb_gains;
> > +	struct ipu3_uapi_bnr_static_config_wb_gains_thr_config wb_gains_thr;
> > +	struct ipu3_uapi_bnr_static_config_thr_coeffs_config thr_coeffs;
> > +	struct ipu3_uapi_bnr_static_config_thr_ctrl_shd_config thr_ctrl_shd;
> > +	struct ipu3_uapi_bnr_static_config_opt_center_config opt_center;
> > +	struct ipu3_uapi_bnr_static_config_lut_config lut;
> > +	struct ipu3_uapi_bnr_static_config_bp_ctrl_config bp_ctrl;
> > +	struct ipu3_uapi_bnr_static_config_dn_detect_ctrl_config dn_detect_ctrl;
> > +	__u32 column_size;
> > +	struct ipu3_uapi_bnr_static_config_opt_center_sqr_config opt_center_sqr;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bnr_static_config_green_disparity - Correct green disparity
> > + *
> > + * @gd_red:	Shading gain coeff for gr disparity level in bright red region.
> > + *		Precision u0.6, default 4(0.0625).
> > + * @__reserved0:	reserved
> > + * @gd_green:	Shading gain coeff for gr disparity level in bright green
> > + *		region. Precision u0.6, default 4(0.0625).
> > + * @__reserved1:	reserved
> > + * @gd_blue:	Shading gain coeff for gr disparity level in bright blue region.
> > + *		Precision u0.6, default 4(0.0625).
> > + * @__reserved2:	reserved
> > + * @gd_black:	Maximal green disparity level in dark region (stronger disparity
> > + *		assumed to be image detail). Precision u14, default 80.
> > + * @__reserved3:	reserved
> > + * @gd_shading:	Change maximal green disparity level according to square
> > + *		distance from image center.
> > + * @__reserved4:	reserved
> > + * @gd_support:	Lower bound for the number of second green color pixels in
> > + *		current pixel neighborhood with less than threshold difference
> > + *		from it.
> > + *
> > + * The shading gain coeff of red, green, blue and black are used to calculate
> > + * threshold given a pixel's color value and its coordinates in the image.
> > + *
> > + * @__reserved5:	reserved
> > + * @gd_clip:	Turn green disparity clip on/off, [0,1], default 1.
> > + * @gd_central_weight:	Central pixel weight in 9 pixels weighted sum.
> > + */
> > +struct ipu3_uapi_bnr_static_config_green_disparity {
> > +	__u32 gd_red:6;
> > +	__u32 __reserved0:2;
> > +	__u32 gd_green:6;
> > +	__u32 __reserved1:2;
> > +	__u32 gd_blue:6;
> > +	__u32 __reserved2:10;
> > +	__u32 gd_black:14;
> > +	__u32 __reserved3:2;
> > +	__u32 gd_shading:7;
> > +	__u32 __reserved4:1;
> > +	__u32 gd_support:2;
> > +	__u32 __reserved5:1;
> > +	__u32 gd_clip:1;
> > +	__u32 gd_central_weight:4;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_dm_config - De-mosaic parameters
> > + *
> > + * @dm_en:	de-mosaic enable.
> > + * @ch_ar_en:	Checker artifacts removal enable flag. Default 0.
> > + * @fcc_en:	False color correction (FCC) enable flag. Default 0.
> > + * @__reserved0:	reserved
> > + * @frame_width:	do not care
> > + * @gamma_sc:	Sharpening coefficient (coefficient of 2-d derivation of
> > + *		complementary color in Hamilton-Adams interpolation).
> > + *		u5, range [0-31], default 8.
> > + * @__reserved1:	reserved
> > + * @lc_ctrl:	Parameter that controls weights of Chroma Homogeneity metric
> > + *		in calculation of final homogeneity metric.
> > + *		u5, range [0-31], default 7.
> > + * @__reserved2:	reserved
> > + * @cr_param1:	First parameter that defines Checker artifact removal
> > + *		feature gain.Precision u5, range [0-31], default 8.
> > + * @__reserved3:	reserved
> > + * @cr_param2:	Second parameter that defines Checker artifact removal
> > + *		feature gain. Precision u5, range [0-31], default 8.
> > + * @__reserved4:	reserved
> > + * @coring_param:	Defines power of false color correction operation.
> > + *			low for preserving edge colors, high for preserving gray
> > + *			edge artifacts. u1.4, range [0-1.9375], default 4(0.25).
> > + * @__reserved5:	reserved
> > + *
> > + * The demosaic fixed function block is responsible to covert Bayer(mosaiced)
> > + * images into color images based on demosaicing algorithm.
> > + */
> > +struct ipu3_uapi_dm_config {
> > +	/* DWORD0 */
> > +	__u32 dm_en:1;
> > +	__u32 ch_ar_en:1;
> > +	__u32 fcc_en:1;
> > +	__u32 __reserved0:13;
> > +	__u32 frame_width:16;
> > +
> > +	/* DWORD1 */
> > +	__u32 gamma_sc:5;
> > +	__u32 __reserved1:3;
> > +	__u32 lc_ctrl:5;
> > +	__u32 __reserved2:3;
> > +	__u32 cr_param1:5;
> > +	__u32 __reserved3:3;
> > +	__u32 cr_param2:5;
> > +	__u32 __reserved4:3;
> > +
> > +	/* DWORD2 */
> > +	__u32 coring_param:5;
> > +	__u32 __reserved5:27;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_ccm_mat_config - Color correction matrix
> > + *
> > + * @coeff_m11: CCM 3x3 coefficient, range -65536, 65535
> > + * @coeff_m12: CCM 3x3 coefficient, range -8192, 8191
> > + * @coeff_m13: CCM 3x3 coefficient, range -32768, 32767
> > + * @coeff_o_r: Bias 3x1 coefficient, range -8191, 8181
> > + * @coeff_m21: CCM 3x3 coefficient, range -32767, 32767
> > + * @coeff_m22: CCM 3x3 coefficient, range -8192, 8191
> > + * @coeff_m23: CCM 3x3 coefficient, range -32768, 32767
> > + * @coeff_o_g: Bias 3x1 coefficient, range -8191, 8181
> > + * @coeff_m31: CCM 3x3 coefficient, range -32768, 32767
> > + * @coeff_m32: CCM 3x3 coefficient, range -8192, 8191
> > + * @coeff_m33: CCM 3x3 coefficient, range -32768, 32767
> > + * @coeff_o_b: Bias 3x1 coefficient, range -8191, 8181

For coherency along the header, please represent ranges
the same way. On other places, you used [min..max].

> > + *
> > + * Transform sensor specific color space to standard sRGB by applying 3x3 matrix
> > + * and adding a bias vector O. The transformation is basically a rotation and
> > + * translation in the 3-dimensional color spaces. Here are the defaults:
> > + *
> > + *	9775,	-2671,	1087,	0
> > + *	-1071,	8303,	815,	0
> > + *	-23,	-7887,	16103,	0
> > + */
> > +struct ipu3_uapi_ccm_mat_config {
> > +	__s16 coeff_m11;
> > +	__s16 coeff_m12;
> > +	__s16 coeff_m13;
> > +	__s16 coeff_o_r;
> > +	__s16 coeff_m21;
> > +	__s16 coeff_m22;
> > +	__s16 coeff_m23;
> > +	__s16 coeff_o_g;
> > +	__s16 coeff_m31;
> > +	__s16 coeff_m32;
> > +	__s16 coeff_m33;
> > +	__s16 coeff_o_b;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_gamma_corr_ctrl - Gamma correction
> > + *
> > + * @enable: gamma correction enable.
> > + * @__reserved: reserved
> > + */
> > +struct ipu3_uapi_gamma_corr_ctrl {
> > +	__u32 enable:1;
> > +	__u32 __reserved:31;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_gamma_corr_lut - Per-pixel tone mapping implemented as LUT.
> > + *
> > + * @lut:	256 tabulated values of the gamma function. LUT[1].. LUT[256]
> > + *		format u13.0, range (0, 8191).

Same note about ranges here... Use just one type of convention...

> > + *
> > + * The tone mapping operation is done by a Piece wise linear graph
> > + * that is implemented as a lookup table(LUT). The pixel component input
> > + * intensity is the X-axis of the graph which is the table entry.
> > + */
> > +struct ipu3_uapi_gamma_corr_lut {
> > +	__u16 lut[IPU3_UAPI_GAMMA_CORR_LUT_ENTRIES];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_gamma_config - Gamma config
> > + *
> > + * @gc_ctrl: control of gamma correction &ipu3_uapi_gamma_corr_ctrl
> > + * @gc_lut: lookup table of gamma correction &ipu3_uapi_gamma_corr_lut
> > + */
> > +struct ipu3_uapi_gamma_config {
> > +	IPU3_ALIGN struct ipu3_uapi_gamma_corr_ctrl gc_ctrl;
> > +	IPU3_ALIGN struct ipu3_uapi_gamma_corr_lut gc_lut;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_csc_mat_config - Color space conversion matrix config
> > + *
> > + * @coeff_c11:	Conversion matrix value, format s0.14, range (-1,1), default 1.
> > + * @coeff_c12:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> > + * @coeff_c13:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> > + * @coeff_b1:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
> > + * @coeff_c21:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> > + * @coeff_c22:	Conversion matrix value, format s0.14, range (-1,1), default 1.
> > + * @coeff_c23:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> > + * @coeff_b2:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.
> > + * @coeff_c31:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> > + * @coeff_c32:	Conversion matrix value, format s0.14, range (-1,1), default 0.
> > + * @coeff_c33:	Conversion matrix value, format s0.14, range (-1,1), default 1.
> > + * @coeff_b3:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default 0.

and here.

> > + *
> > + * To transform each pixel from RGB to YUV (Y - brightness/luminance,
> > + * UV -chroma) by applying the pixel's values by a 3x3 matrix and adding an
> > + * optional bias 3x1 vector.
> > + */
> > +struct ipu3_uapi_csc_mat_config {
> > +	__s16 coeff_c11;
> > +	__s16 coeff_c12;
> > +	__s16 coeff_c13;
> > +	__s16 coeff_b1;
> > +	__s16 coeff_c21;
> > +	__s16 coeff_c22;
> > +	__s16 coeff_c23;
> > +	__s16 coeff_b2;
> > +	__s16 coeff_c31;
> > +	__s16 coeff_c32;
> > +	__s16 coeff_c33;
> > +	__s16 coeff_b3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_cds_params - Chroma down-scaling
> > + *
> > + * @ds_c00:	range 0, 3
> > + * @ds_c01:	range 0, 3
> > + * @ds_c02:	range 0, 3
> > + * @ds_c03:	range 0, 3
> > + * @ds_c10:	range 0, 3
> > + * @ds_c11:	range 0, 3
> > + * @ds_c12:	range 0, 3
> > + * @ds_c13:	range 0, 3

and here and similar places below.

> > + *
> > + * Above are 4x2 filter has the following defaults:
> > + *	1, 3, 3, 1,
> > + *	1, 3, 3, 1,
> > + *
> > + * @ds_nf:	Normalization factor for Chroma output downscaling filter,
> > + *		range 0,4, default 2.
> > + * @__reserved0:	reserved
> > + * @csc_en:	Color space conversion enable
> > + * @uv_bin_output:	0: output YUV 4.2.0, 1: output YUV 4.2.2(default).
> > + * @__reserved1:	reserved
> > + */
> > +struct ipu3_uapi_cds_params {
> > +	__u32 ds_c00:2;
> > +	__u32 ds_c01:2;
> > +	__u32 ds_c02:2;
> > +	__u32 ds_c03:2;
> > +	__u32 ds_c10:2;
> > +	__u32 ds_c11:2;
> > +	__u32 ds_c12:2;
> > +	__u32 ds_c13:2;
> > +	__u32 ds_nf:5;
> > +	__u32 __reserved0:3;
> > +	__u32 csc_en:1;
> > +	__u32 uv_bin_output:1;
> > +	__u32 __reserved1:6;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_shd_grid_config - Bayer shading(darkening) correction
> > + *
> > + * @width:	Grid horizontal dimensions, u8, [8, 128], default 73
> > + * @height:	Grid vertical dimensions, u8, [8, 128], default 56
> > + * @block_width_log2:	Log2 of the width of the grid cell in pixel count
> > + *			u4, [0, 15], default value 5.
> > + * @__reserved0:	reserved
> > + * @block_height_log2:	Log2 of the height of the grid cell in pixel count
> > + *			u4, [0, 15], default value 6.
> > + * @__reserved1:	reserved
> > + * @grid_height_per_slice:	SHD_MAX_CELLS_PER_SET/width.
> > + *				(with SHD_MAX_CELLS_PER_SET = 146).
> > + * @x_start:	X value of top left corner of sensor relative to ROI
> > + *		u12, [-4096 0]. default 0, only negative values.
> > + * @y_start:	Y value of top left corner of sensor relative to ROI
> > + *		u12, [-4096 0]. default 0, only negative values.
> > + */
> > +struct ipu3_uapi_shd_grid_config {
> > +	/* reg 0 */
> > +	__u8 width;
> > +	__u8 height;
> > +	__u8 block_width_log2:3;
> > +	__u8 __reserved0:1;
> > +	__u8 block_height_log2:3;
> > +	__u8 __reserved1:1;
> > +	__u8 grid_height_per_slice;
> > +	/* reg 1 */
> > +	__s16 x_start;
> > +	__s16 y_start;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_shd_general_config - Shading general config
> > + *
> > + * @init_set_vrt_offst_ul: set vertical offset,
> > + *			y_start >> block_height_log2 % grid_height_per_slice.
> > + * @shd_enable: shading enable.
> > + * @gain_factor: Gain factor. Shift calculated anti shading value. Precision u2.
> > + *		0x0 - gain factor [1..5), means no shift interpolated value.
> > + *		0x1 - gain factor [1..9), means shift interpolated by 1.
> > + *		0x2 - gain factor [1..17), means shift interpolated by 2.
> > + * @__reserved: reserved
> > + *
> > + * Correction is performed by multiplying a gain factor for each of the 4 Bayer
> > + * channels as a function of the pixel location in the sensor.
> > + */
> > +struct ipu3_uapi_shd_general_config {
> > +	__u32 init_set_vrt_offst_ul:8;
> > +	__u32 shd_enable:1;
> > +	/* aka 'gf' */
> > +	__u32 gain_factor:2;
> > +	__u32 __reserved:21;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_shd_black_level_config - Black level correction
> > + *
> > + * @bl_r:	Bios values for green red. s11 range [-2048, 2047].
> > + * @bl_gr:	Bios values for green blue. s11 range [-2048, 2047].
> > + * @bl_gb:	Bios values for red. s11 range [-2048, 2047].
> > + * @bl_b:	Bios values for blue. s11 range [-2048, 2047].
> > + */
> > +struct ipu3_uapi_shd_black_level_config {
> > +	__s16 bl_r;
> > +	__s16 bl_gr;
> > +	__s16 bl_gb;
> > +	__s16 bl_b;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_shd_config_static - Shading config static
> > + *
> > + * @grid:	shading grid config &ipu3_uapi_shd_grid_config
> > + * @general:	shading general config &ipu3_uapi_shd_general_config
> > + * @black_level:	black level config for shading correction as defined by
> > + *			&ipu3_uapi_shd_black_level_config
> > + */
> > +struct ipu3_uapi_shd_config_static {
> > +	struct ipu3_uapi_shd_grid_config grid;
> > +	struct ipu3_uapi_shd_general_config general;
> > +	struct ipu3_uapi_shd_black_level_config black_level;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_shd_lut - Shading gain factor lookup table.
> > + *
> > + * @sets: array
> > + * @sets.r_and_gr: Red and GreenR Lookup table.
> > + * @sets.r_and_gr.r: Red shading factor.
> > + * @sets.r_and_gr.gr: GreenR shading factor.
> > + * @sets.__reserved1: reserved
> > + * @sets.gb_and_b: GreenB and Blue Lookup table.
> > + * @sets.gb_and_b.gb: GreenB shading factor.
> > + * @sets.gb_and_b.b: Blue shading factor.
> > + * @sets.__reserved2: reserved
> > + *
> > + * Map to shading correction LUT register set.
> > + */
> > +struct ipu3_uapi_shd_lut {
> > +	struct {
> > +		struct {
> > +			__u16 r;
> > +			__u16 gr;
> > +		} r_and_gr[IPU3_UAPI_SHD_MAX_CELLS_PER_SET];
> > +		__u8 __reserved1[24];
> > +		struct {
> > +			__u16 gb;
> > +			__u16 b;
> > +		} gb_and_b[IPU3_UAPI_SHD_MAX_CELLS_PER_SET];
> > +		__u8 __reserved2[24];
> > +	} sets[IPU3_UAPI_SHD_MAX_CFG_SETS];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_shd_config - Shading config
> > + *
> > + * @shd:	shading static config, see &ipu3_uapi_shd_config_static
> > + * @shd_lut:	shading lookup table &ipu3_uapi_shd_lut
> > + */
> > +struct ipu3_uapi_shd_config {
> > +	IPU3_ALIGN struct ipu3_uapi_shd_config_static shd;
> > +	IPU3_ALIGN struct ipu3_uapi_shd_lut shd_lut;
> > +} __packed;
> > +
> > +/* Image Enhancement Filter directed */
> > +
> > +/**
> > + * struct ipu3_uapi_iefd_cux2 - IEFd Config Unit 2 parameters
> > + *
> > + * @x0:		X0 point of Config Unit, u9.0, default 0.
> > + * @x1:		X1 point of Config Unit, u9.0, default 0.
> > + * @a01:	Slope A of Config Unit, s4.4, default 0.
> > + * @b01:	Always 0.
> > + *
> > + * Calculate weight for blending directed and non-directed denoise elements
> > + *
> > + * Note:
> > + * Each instance of Config Unit needs X coordinate of n points and
> > + * slope A factor between points calculated by driver based on calibration
> > + * parameters.
> > + */
> > +struct ipu3_uapi_iefd_cux2 {
> > +	__u32 x0:9;
> > +	__u32 x1:9;
> > +	__u32 a01:9;
> > +	__u32 b01:5;	/* NOTE: hardcoded to zero */
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_iefd_cux6_ed - Calculate power of non-directed sharpening
> > + *				   element, Config Unit 6 for edge detail (ED).
> > + *
> > + * @x0:	X coordinate of point 0, u9.0, default 0.
> > + * @x1:	X coordinate of point 1, u9.0, default 0.
> > + * @x2:	X coordinate of point 2, u9.0, default 0.
> > + * @__reserved0:	reserved
> > + * @x3:	X coordinate of point 3, u9.0, default 0.
> > + * @x4:	X coordinate of point 4, u9.0, default 0.
> > + * @x5:	X coordinate of point 5, u9.0, default 0.
> > + * @__reserved1:	reserved
> > + * @a01:	slope A points 01, s4.4, default 0.
> > + * @a12:	slope A points 12, s4.4, default 0.
> > + * @a23:	slope A points 23, s4.4, default 0.
> > + * @__reserved2:	reserved
> > + * @a34:	slope A points 34, s4.4, default 0.
> > + * @a45:	slope A points 45, s4.4, default 0.
> > + * @__reserved3:	reserved
> > + * @b01:	slope B points 01, s4.4, default 0.
> > + * @b12:	slope B points 12, s4.4, default 0.
> > + * @b23:	slope B points 23, s4.4, default 0.
> > + * @__reserved4:	reserved
> > + * @b34:	slope B points 34, s4.4, default 0.
> > + * @b45:	slope B points 45, s4.4, default 0.
> > + * @__reserved5:	reserved
> > + */
> > +struct ipu3_uapi_iefd_cux6_ed {
> > +	__u32 x0:9;
> > +	__u32 x1:9;
> > +	__u32 x2:9;
> > +	__u32 __reserved0:5;
> > +
> > +	__u32 x3:9;
> > +	__u32 x4:9;
> > +	__u32 x5:9;
> > +	__u32 __reserved1:5;
> > +
> > +	__u32 a01:9;
> > +	__u32 a12:9;
> > +	__u32 a23:9;
> > +	__u32 __reserved2:5;
> > +
> > +	__u32 a34:9;
> > +	__u32 a45:9;
> > +	__u32 __reserved3:14;
> > +
> > +	__u32 b01:9;
> > +	__u32 b12:9;
> > +	__u32 b23:9;
> > +	__u32 __reserved4:5;
> > +
> > +	__u32 b34:9;
> > +	__u32 b45:9;
> > +	__u32 __reserved5:14;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_iefd_cux2_1 - Calculate power of non-directed denoise
> > + *				  element apply.
> > + * @x0: X0 point of Config Unit, u9.0, default 0.
> > + * @x1: X1 point of Config Unit, u9.0, default 0.
> > + * @a01: Slope A of Config Unit, s4.4, default 0.
> > + * @__reserved1: reserved
> > + * @b01: offset B0 of Config Unit, u7.0, default 0.
> > + * @__reserved2: reserved
> > + */
> > +struct ipu3_uapi_iefd_cux2_1 {
> > +	__u32 x0:9;
> > +	__u32 x1:9;
> > +	__u32 a01:9;
> > +	__u32 __reserved1:5;
> > +
> > +	__u32 b01:8;
> > +	__u32 __reserved2:24;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_iefd_cux4 - Calculate power of non-directed sharpening
> > + *				element.
> > + *
> > + * @x0:	X0 point of Config Unit, u9.0, default 0.
> > + * @x1:	X1 point of Config Unit, u9.0, default 0.
> > + * @x2:	X2 point of Config Unit, u9.0, default 0.
> > + * @__reserved0:	reserved
> > + * @x3:	X3 point of Config Unit, u9.0, default 0.
> > + * @a01:	Slope A0 of Config Unit, s4.4, default 0.
> > + * @a12:	Slope A1 of Config Unit, s4.4, default 0.
> > + * @__reserved1:	reserved
> > + * @a23:	Slope A2 of Config Unit, s4.4, default 0.
> > + * @b01:	Offset B0 of Config Unit, s7.0, default 0.
> > + * @b12:	Offset B1 of Config Unit, s7.0, default 0.
> > + * @__reserved2:	reserved
> > + * @b23:	Offset B2 of Config Unit, s7.0, default 0.
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_iefd_cux4 {
> > +	__u32 x0:9;
> > +	__u32 x1:9;
> > +	__u32 x2:9;
> > +	__u32 __reserved0:5;
> > +
> > +	__u32 x3:9;
> > +	__u32 a01:9;
> > +	__u32 a12:9;
> > +	__u32 __reserved1:5;
> > +
> > +	__u32 a23:9;
> > +	__u32 b01:8;
> > +	__u32 b12:8;
> > +	__u32 __reserved2:7;
> > +
> > +	__u32 b23:8;
> > +	__u32 __reserved3:24;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_iefd_cux6_rad - Radial Config Unit (CU)
> > + *
> > + * @x0:	x0 points of Config Unit radial, u8.0
> > + * @x1:	x1 points of Config Unit radial, u8.0
> > + * @x2:	x2 points of Config Unit radial, u8.0
> > + * @x3:	x3 points of Config Unit radial, u8.0
> > + * @x4:	x4 points of Config Unit radial, u8.0
> > + * @x5:	x5 points of Config Unit radial, u8.0
> > + * @__reserved1: reserved
> > + * @a01:	Slope A of Config Unit radial, s7.8
> > + * @a12:	Slope A of Config Unit radial, s7.8
> > + * @a23:	Slope A of Config Unit radial, s7.8
> > + * @a34:	Slope A of Config Unit radial, s7.8
> > + * @a45:	Slope A of Config Unit radial, s7.8
> > + * @__reserved2: reserved
> > + * @b01:	Slope B of Config Unit radial, s9.0
> > + * @b12:	Slope B of Config Unit radial, s9.0
> > + * @b23:	Slope B of Config Unit radial, s9.0
> > + * @__reserved4: reserved
> > + * @b34:	Slope B of Config Unit radial, s9.0
> > + * @b45:	Slope B of Config Unit radial, s9.0
> > + * @__reserved5: reserved
> > + */
> > +struct ipu3_uapi_iefd_cux6_rad {
> > +	__u32 x0:8;
> > +	__u32 x1:8;
> > +	__u32 x2:8;
> > +	__u32 x3:8;
> > +
> > +	__u32 x4:8;
> > +	__u32 x5:8;
> > +	__u32 __reserved1:16;
> > +
> > +	__u32 a01:16;
> > +	__u32 a12:16;
> > +
> > +	__u32 a23:16;
> > +	__u32 a34:16;
> > +
> > +	__u32 a45:16;
> > +	__u32 __reserved2:16;
> > +
> > +	__u32 b01:10;
> > +	__u32 b12:10;
> > +	__u32 b23:10;
> > +	__u32 __reserved4:2;
> > +
> > +	__u32 b34:10;
> > +	__u32 b45:10;
> > +	__u32 __reserved5:12;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_cfg_units - IEFd Config Units parameters
> > + *
> > + * @cu_1: calculate weight for blending directed and
> > + *	  non-directed denoise elements. See &ipu3_uapi_iefd_cux2
> > + * @cu_ed: calculate power of non-directed sharpening element, see
> > + *	   &ipu3_uapi_iefd_cux6_ed
> > + * @cu_3: calculate weight for blending directed and
> > + *	  non-directed denoise elements. A &ipu3_uapi_iefd_cux2
> > + * @cu_5: calculate power of non-directed denoise element apply, use
> > + *	  &ipu3_uapi_iefd_cux2_1
> > + * @cu_6: calculate power of non-directed sharpening element. See
> > + *	  &ipu3_uapi_iefd_cux4
> > + * @cu_7: calculate weight for blending directed and
> > + *	  non-directed denoise elements. Use &ipu3_uapi_iefd_cux2
> > + * @cu_unsharp: Config Unit of unsharp &ipu3_uapi_iefd_cux4
> > + * @cu_radial: Config Unit of radial &ipu3_uapi_iefd_cux6_rad
> > + * @cu_vssnlm: Config Unit of vssnlm &ipu3_uapi_iefd_cux2
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_cfg_units {
> > +	struct ipu3_uapi_iefd_cux2 cu_1;
> > +	struct ipu3_uapi_iefd_cux6_ed cu_ed;
> > +	struct ipu3_uapi_iefd_cux2 cu_3;
> > +	struct ipu3_uapi_iefd_cux2_1 cu_5;
> > +	struct ipu3_uapi_iefd_cux4 cu_6;
> > +	struct ipu3_uapi_iefd_cux2 cu_7;
> > +	struct ipu3_uapi_iefd_cux4 cu_unsharp;
> > +	struct ipu3_uapi_iefd_cux6_rad cu_radial;
> > +	struct ipu3_uapi_iefd_cux2 cu_vssnlm;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_config_s - IEFd config
> > + *
> > + * @horver_diag_coeff: Gradiant compensation, coefficient that compensates for
> > + *		       different distance for vertical / horizontal and diagonal
> > + *		       * gradient calculation (~1/sqrt(2)).
> > + * @__reserved0: reserved
> > + * @clamp_stitch: Slope to stitch between clamped and unclamped edge values
> > + * @__reserved1: reserved
> > + * @direct_metric_update: Update coeff for direction metric
> > + * @__reserved2: reserved
> > + * @ed_horver_diag_coeff: Radial Coefficient that compensates for
> > + *			  different distance for vertical/horizontal and
> > + *			  diagonal gradient calculation (~1/sqrt(2))
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_config_s {
> > +	__u32 horver_diag_coeff:7;
> > +	__u32 __reserved0:1;
> > +	__u32 clamp_stitch:6;
> > +	__u32 __reserved1:2;
> > +	__u32 direct_metric_update:5;
> > +	__u32 __reserved2:3;
> > +	__u32 ed_horver_diag_coeff:7;
> > +	__u32 __reserved3:1;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_control - IEFd control
> > + *
> > + * @iefd_en:	Enable IEFd
> > + * @denoise_en:	Enable denoise
> > + * @direct_smooth_en:	Enable directional smooth
> > + * @rad_en:	Enable radial update
> > + * @vssnlm_en:	Enable VSSNLM output filter
> > + * @__reserved:	reserved
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_control {
> > +	__u32 iefd_en:1;
> > +	__u32 denoise_en:1;
> > +	__u32 direct_smooth_en:1;
> > +	__u32 rad_en:1;
> > +	__u32 vssnlm_en:1;
> > +	__u32 __reserved:27;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_sharp_cfg - Sharpening config
> > + *
> > + * @nega_lmt_txt: Sharpening limit for negative overshoots for texture.
> > + * @__reserved0: reserved
> > + * @posi_lmt_txt: Sharpening limit for positive overshoots for texture.
> > + * @__reserved1: reserved
> > + * @nega_lmt_dir: Sharpening limit for negative overshoots for direction (edge).
> > + * @__reserved2: reserved
> > + * @posi_lmt_dir: Sharpening limit for positive overshoots for direction (edge).
> > + * @__reserved3: reserved
> > + *
> > + * Fixed point type u13.0, range [0, 8191].
> > + */
> > +struct ipu3_uapi_sharp_cfg {
> > +	__u32 nega_lmt_txt:13;
> > +	__u32 __reserved0:19;
> > +	__u32 posi_lmt_txt:13;
> > +	__u32 __reserved1:19;
> > +	__u32 nega_lmt_dir:13;
> > +	__u32 __reserved2:19;
> > +	__u32 posi_lmt_dir:13;
> > +	__u32 __reserved3:19;
> > +} __packed;
> > +
> > +/**
> > + * struct struct ipu3_uapi_far_w - Sharpening config for far sub-group
> > + *
> > + * @dir_shrp:	Weight of wide direct sharpening, u1.6, range 0-64, default 64.
> > + * @__reserved0:	reserved
> > + * @dir_dns:	Weight of wide direct denoising, u1.6, range 0-64, default 0.
> > + * @__reserved1:	reserved
> > + * @ndir_dns_powr:	Power of non-direct denoising,
> > + *			Precision u1.6, range 0-64, default 64.
> > + * @__reserved2:	reserved
> > + */
> > +struct ipu3_uapi_far_w {
> > +	__u32 dir_shrp:7;
> > +	__u32 __reserved0:1;
> > +	__u32 dir_dns:7;
> > +	__u32 __reserved1:1;
> > +	__u32 ndir_dns_powr:7;
> > +	__u32 __reserved2:9;
> > +} __packed;
> > +
> > +/**
> > + * struct struct ipu3_uapi_unsharp_cfg - Unsharp config
> > + *
> > + * @unsharp_weight: Unsharp mask blending weight.
> > + *		    u1.6, range 0-64, default 16.
> > + *		    0 – disabled, 64 - use only unsharp.
> > + * @__reserved0: reserved
> > + * @unsharp_amount: Unsharp mask amount, u4.5, range 0-511, default 0.
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_unsharp_cfg {
> > +	__u32 unsharp_weight:7;
> > +	__u32 __reserved0:1;
> > +	__u32 unsharp_amount:9;
> > +	__u32 __reserved1:15;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_shrp_cfg - IEFd sharpness config
> > + *
> > + * @cfg: sharpness config &ipu3_uapi_sharp_cfg
> > + * @far_w: wide range config, value as specified by &ipu3_uapi_far_w:
> > + *	The 5x5 environment is separated into 2 sub-groups, the 3x3 nearest
> > + *	neighbors (8 pixels called Near), and the second order neighborhood
> > + *	around them (16 pixels called Far).
> > + * @unshrp_cfg: unsharpness config. &ipu3_uapi_unsharp_cfg
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_shrp_cfg {
> > +	struct ipu3_uapi_sharp_cfg cfg;
> > +	struct ipu3_uapi_far_w far_w;
> > +	struct ipu3_uapi_unsharp_cfg unshrp_cfg;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_unsharp_coef0 - Unsharp mask coefficients
> > + *
> > + * @c00: Coeff11, s0.8, range -255 - 255, default 1.
> > + * @c01: Coeff12, s0.8, range -255 - 255, default 5.
> > + * @c02: Coeff13, s0.8, range -255 - 255, default 9.
> > + * @__reserved: reserved
> > + *
> > + * Configurable registers for common sharpening support.
> > + */
> > +struct ipu3_uapi_unsharp_coef0 {
> > +	__u32 c00:9;
> > +	__u32 c01:9;
> > +	__u32 c02:9;
> > +	__u32 __reserved:5;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_unsharp_coef1 - Unsharp mask coefficients
> > + *
> > + * @c11: Coeff22, s0.8, range -255 - 255, default 29.
> > + * @c12: Coeff23, s0.8, range -255 - 255, default 55.
> > + * @c22: Coeff33, s0.8, range -255 - 255, default 96.
> > + * @__reserved: reserved
> > + */
> > +struct ipu3_uapi_unsharp_coef1 {
> > +	__u32 c11:9;
> > +	__u32 c12:9;
> > +	__u32 c22:9;
> > +	__u32 __reserved:5;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_unshrp_cfg - Unsharp mask config
> > + *
> > + * @unsharp_coef0: unsharp coefficient 0 config. See &ipu3_uapi_unsharp_coef0
> > + * @unsharp_coef1: unsharp coefficient 1 config. See &ipu3_uapi_unsharp_coef1
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_unshrp_cfg {
> > +	struct ipu3_uapi_unsharp_coef0 unsharp_coef0;
> > +	struct ipu3_uapi_unsharp_coef1 unsharp_coef1;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_radial_reset_xy - Radial coordinate reset
> > + *
> > + * @x:	Radial reset of x coordinate. Precision s12, [-4095 .. 4095], default 0.
> > + * @__reserved0:	reserved
> > + * @y:	Radial center y coordinate. Precision s12, [-4095 .. 4095], default 0.
> > + * @__reserved1:	reserved
> > + */
> > +struct ipu3_uapi_radial_reset_xy {
> > +	__s32 x:13;
> > +	__u32 __reserved0:3;
> > +	__s32 y:13;
> > +	__u32 __reserved1:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_radial_reset_x2 - Radial X^2 reset
> > + *
> > + * @x2:	Radial reset of x^2 coordinate. Precision u24, default 0.
> > + * @__reserved:	reserved
> > + */
> > +struct ipu3_uapi_radial_reset_x2 {
> > +	__u32 x2:24;
> > +	__u32 __reserved:8;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_radial_reset_y2 - Radial Y^2 reset
> > + *
> > + * @y2:	Radial reset of y^2 coordinate. Precision u24, default 0.
> > + * @__reserved:	reserved
> > + */
> > +struct ipu3_uapi_radial_reset_y2 {
> > +	__u32 y2:24;
> > +	__u32 __reserved:8;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_radial_cfg - Radial config
> > + *
> > + * @rad_nf: Radial. R^2 normalization factor is scale down by 2^ - (15 + scale)
> > + * @__reserved0: reserved
> > + * @rad_inv_r2: Radial R^-2 normelized to (0.5..1), Prec' u7, range [0 .. 127].
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_radial_cfg {
> > +	__u32 rad_nf:4;
> > +	__u32 __reserved0:4;
> > +	__u32 rad_inv_r2:7;
> > +	__u32 __reserved1:17;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_rad_far_w - Radial FAR sub-group
> > + *
> > + * @rad_dir_far_sharp_w: Weight of wide direct sharpening, u1.6, range 0-64,
> > + *			 default 64.
> > + * @rad_dir_far_dns_w: Weight of wide direct denoising, u1.6, range 0-64,
> > + *			 default 0.
> > + * @rad_ndir_far_dns_power: power of non-direct sharpening, u1.6, range 0-64,
> > + *			 default 0.
> > + * @__reserved: reserved
> > + */
> > +struct ipu3_uapi_rad_far_w {
> > +	__u32 rad_dir_far_sharp_w:8;
> > +	__u32 rad_dir_far_dns_w:8;
> > +	__u32 rad_ndir_far_dns_power:8;
> > +	__u32 __reserved:8;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_cu_cfg0 - Radius Config Unit cfg0 register
> > + *
> > + * @cu6_pow: Power of CU6. Power of non-direct sharpening, u3.4.
> > + * @__reserved0: reserved
> > + * @cu_unsharp_pow: Power of unsharp mask, u2.4.
> > + * @__reserved1: reserved
> > + * @rad_cu6_pow: Radial/corner CU6. Directed sharpening power, u3.4.
> > + * @__reserved2: reserved
> > + * @rad_cu_unsharp_pow: Radial power of unsharp mask, u2.4.
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_cu_cfg0 {
> > +	__u32 cu6_pow:7;
> > +	__u32 __reserved0:1;
> > +	__u32 cu_unsharp_pow:7;
> > +	__u32 __reserved1:1;
> > +	__u32 rad_cu6_pow:7;
> > +	__u32 __reserved2:1;
> > +	__u32 rad_cu_unsharp_pow:6;
> > +	__u32 __reserved3:2;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_cu_cfg1 - Radius Config Unit cfg1 register
> > + *
> > + * @rad_cu6_x1: X1 point of Config Unit 6, precision u9.0.
> > + * @__reserved0: reserved
> > + * @rad_cu_unsharp_x1: X1 point for Config Unit unsharp for radial/corner point
> > + *			precision u9.0.
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_cu_cfg1 {
> > +	__u32 rad_cu6_x1:9;
> > +	__u32 __reserved0:1;
> > +	__u32 rad_cu_unsharp_x1:9;
> > +	__u32 __reserved1:13;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_rad_cfg - IEFd parameters changed radially over
> > + *					 the picture plain.
> > + *
> > + * @reset_xy: reset xy value in radial calculation. &ipu3_uapi_radial_reset_xy
> > + * @reset_x2: reset x square value in radial calculation. See struct
> > + *	      &ipu3_uapi_radial_reset_x2
> > + * @reset_y2: reset y square value in radial calculation, see struct
> > + *	      &ipu3_uapi_radial_reset_y2
> > + * @cfg: radial config defined in &ipu3_uapi_radial_cfg
> > + * @rad_far_w: weight for wide range radial. &ipu3_uapi_rad_far_w
> > + * @cu_cfg0: configuration unit 0. See &ipu3_uapi_cu_cfg0
> > + * @cu_cfg1: configuration unit 1. See &ipu3_uapi_cu_cfg1
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_rad_cfg {
> > +	struct ipu3_uapi_radial_reset_xy reset_xy;
> > +	struct ipu3_uapi_radial_reset_x2 reset_x2;
> > +	struct ipu3_uapi_radial_reset_y2 reset_y2;
> > +	struct ipu3_uapi_radial_cfg cfg;
> > +	struct ipu3_uapi_rad_far_w rad_far_w;
> > +	struct ipu3_uapi_cu_cfg0 cu_cfg0;
> > +	struct ipu3_uapi_cu_cfg1 cu_cfg1;
> > +} __packed;
> > +
> > +/* Vssnlm - Very small scale non-local mean algorithm */
> > +
> > +/**
> > + * struct ipu3_uapi_vss_lut_x - Vssnlm LUT x0/x1/x2
> > + *
> > + * @vs_x0: Vssnlm LUT x0, precision u8, range 0-255, default 16.
> > + * @vs_x1: Vssnlm LUT x1, precision u8, range 0-255, default 32.
> > + * @vs_x2: Vssnlm LUT x2, precision u8, range 0-255, default 64.
> > + * @__reserved2: reserved
> > + */
> > +struct ipu3_uapi_vss_lut_x {
> > +	__u32 vs_x0:8;
> > +	__u32 vs_x1:8;
> > +	__u32 vs_x2:8;
> > +	__u32 __reserved2:8;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_vss_lut_y - Vssnlm LUT y0/y1/y2
> > + *
> > + * @vs_y1: Vssnlm LUT y1, precision u4, range 0-8, default 1.
> > + * @__reserved0: reserved
> > + * @vs_y2: Vssnlm LUT y2, precision u4, range 0-8, default 3.
> > + * @__reserved1: reserved
> > + * @vs_y3: Vssnlm LUT y3, precision u4, range 0-8, default 8.
> > + * @__reserved2: reserved
> > + */
> > +struct ipu3_uapi_vss_lut_y {
> > +	__u32 vs_y1:4;
> > +	__u32 __reserved0:4;
> > +	__u32 vs_y2:4;
> > +	__u32 __reserved1:4;
> > +	__u32 vs_y3:4;
> > +	__u32 __reserved2:12;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_vssnlm_cf - IEFd Vssnlm Lookup table
> > + *
> > + * @vss_lut_x: vss lookup table. See &ipu3_uapi_vss_lut_x description
> > + * @vss_lut_y: vss lookup table. See &ipu3_uapi_vss_lut_y description
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_vssnlm_cfg {
> > +	struct ipu3_uapi_vss_lut_x vss_lut_x;
> > +	struct ipu3_uapi_vss_lut_y vss_lut_y;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_iefd_config - IEFd config
> > + *
> > + * @units: configuration unit setting, &ipu3_uapi_yuvp1_iefd_cfg_units
> > + * @config: configuration, as defined by &ipu3_uapi_yuvp1_iefd_config_s
> > + * @control: control setting, as defined by &ipu3_uapi_yuvp1_iefd_control
> > + * @sharp: sharpness setting, as defined by &ipu3_uapi_yuvp1_iefd_shrp_cfg
> > + * @unsharp: unsharpness setting, as defined by &ipu3_uapi_yuvp1_iefd_unshrp_cfg
> > + * @rad: radial setting, as defined by &ipu3_uapi_yuvp1_iefd_rad_cfg
> > + * @vsslnm: vsslnm setting, as defined by &ipu3_uapi_yuvp1_iefd_vssnlm_cfg
> > + */
> > +struct ipu3_uapi_yuvp1_iefd_config {
> > +	struct ipu3_uapi_yuvp1_iefd_cfg_units units;
> > +	struct ipu3_uapi_yuvp1_iefd_config_s config;
> > +	struct ipu3_uapi_yuvp1_iefd_control control;
> > +	struct ipu3_uapi_yuvp1_iefd_shrp_cfg sharp;
> > +	struct ipu3_uapi_yuvp1_iefd_unshrp_cfg unsharp;
> > +	struct ipu3_uapi_yuvp1_iefd_rad_cfg rad;
> > +	struct ipu3_uapi_yuvp1_iefd_vssnlm_cfg vsslnm;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_yds_config - Y Down-Sampling config
> > + *
> > + * @c00: range 0, 3, default 0x0
> > + * @c01: range 0, 3, default 0x1
> > + * @c02: range 0, 3, default 0x1
> > + * @c03: range 0, 3, default 0x0
> > + * @c10: range 0, 3, default 0x0
> > + * @c11: range 0, 3, default 0x1
> > + * @c12: range 0, 3, default 0x1
> > + * @c13: range 0, 3, default 0x0
> > + *
> > + * Above are 4x2 filter coefficients for chroma output downscaling.
> > + *
> > + * @norm_factor: Normalization factor, range 0, 4, default 2
> > + *		0 - divide by 1
> > + *		1 - divide by 2
> > + *		2 - divide by 4
> > + *		3 - divide by 8
> > + *		4 - divide by 16
> > + * @__reserved0: reserved
> > + * @bin_output: Down sampling on Luma channel in two optional modes
> > + *		0 - Bin output 4.2.0 (default), 1 output 4.2.2.
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_yds_config {
> > +	__u32 c00:2;
> > +	__u32 c01:2;
> > +	__u32 c02:2;
> > +	__u32 c03:2;
> > +	__u32 c10:2;
> > +	__u32 c11:2;
> > +	__u32 c12:2;
> > +	__u32 c13:2;
> > +	__u32 norm_factor:5;
> > +	__u32 __reserved0:4;
> > +	__u32 bin_output:1;
> > +	__u32 __reserved1:6;
> > +} __packed;
> > +
> > +/* Chroma Noise Reduction */
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_chnr_enable_config - Chroma noise reduction enable
> > + *
> > + * @enable: enable/disable chroma noise reduction
> > + * @yuv_mode: 0 - YUV420, 1 - YUV422
> > + * @__reserved0: reserved
> > + * @col_size: number of columns in the frame, max width is 2560
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_chnr_enable_config {
> > +	__u32 enable:1;
> > +	__u32 yuv_mode:1;
> > +	__u32 __reserved0:14;
> > +	__u32 col_size:12;
> > +	__u32 __reserved1:4;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_chnr_coring_config - Coring thresholds for UV
> > + *
> > + * @u: U coring level, u0.13, range [0.0, 1.0), default 0.0
> > + * @__reserved0: reserved
> > + * @v: V coring level, u0.13, range [0.0, 1.0), default 0.0
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_chnr_coring_config {
> > +	__u32 u:13;
> > +	__u32 __reserved0:3;
> > +	__u32 v:13;
> > +	__u32 __reserved1:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_chnr_sense_gain_config - Chroma noise reduction gains
> > + *
> > + * All sensitivity gain parameters have precision u13.0, range [0, 8191].
> > + *
> > + * @vy: Sensitivity of horizontal edge of Y, default 100
> > + * @vu: Sensitivity of horizontal edge of U, default 100
> > + * @vv: Sensitivity of horizontal edge of V, default 100
> > + * @__reserved0: reserved
> > + * @hy: Sensitivity of vertical edge of Y, default 50
> > + * @hu: Sensitivity of vertical edge of U, default 50
> > + * @hv: Sensitivity of vertical edge of V, default 50
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_chnr_sense_gain_config {
> > +	__u32 vy:8;
> > +	__u32 vu:8;
> > +	__u32 vv:8;
> > +	__u32 __reserved0:8;
> > +
> > +	__u32 hy:8;
> > +	__u32 hu:8;
> > +	__u32 hv:8;
> > +	__u32 __reserved1:8;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_chnr_iir_fir_config - Chroma IIR/FIR filter config
> > + *
> > + * @fir_0h: Value of center tap in horizontal FIR, range [0..32], default 8.
> > + * @__reserved0: reserved
> > + * @fir_1h: Value of distance 1 in horizontal FIR, range [0..32], default 12.
> > + * @__reserved1: reserved
> > + * @fir_2h: Value of distance 2 tap in horizontal FIR, range [0..32], default 0.
> > + * @dalpha_clip_val: weight for previous row in IIR, range [1..256], default 0.
> > + * @__reserved2: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_chnr_iir_fir_config {
> > +	__u32 fir_0h:6;
> > +	__u32 __reserved0:2;
> > +	__u32 fir_1h:6;
> > +	__u32 __reserved1:2;
> > +	__u32 fir_2h:6;
> > +	__u32 dalpha_clip_val:9;
> > +	__u32 __reserved2:1;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_chnr_config - Chroma noise reduction config
> > + *
> > + * @enable: chroma noise reduction enable, see
> > + *	    &ipu3_uapi_yuvp1_chnr_enable_config
> > + * @coring: coring config for chroma noise reduction, see
> > + *	    &ipu3_uapi_yuvp1_chnr_coring_config
> > + * @sense_gain: sensitivity config for chroma noise reduction, see
> > + *		ipu3_uapi_yuvp1_chnr_sense_gain_config
> > + * @iir_fir: iir and fir config for chroma noise reduction, see
> > + *	     ipu3_uapi_yuvp1_chnr_iir_fir_config
> > + */
> > +struct ipu3_uapi_yuvp1_chnr_config {
> > +	struct ipu3_uapi_yuvp1_chnr_enable_config enable;
> > +	struct ipu3_uapi_yuvp1_chnr_coring_config coring;
> > +	struct ipu3_uapi_yuvp1_chnr_sense_gain_config sense_gain;
> > +	struct ipu3_uapi_yuvp1_chnr_iir_fir_config iir_fir;
> > +} __packed;
> > +
> > +/* Edge Enhancement and Noise Reduction */
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config - Luma(Y) edge enhancement low-pass
> > + *					       filter coefficients
> > + *
> > + * @a_diag: Smoothing diagonal coefficient, u5.0.
> > + * @__reserved0: reserved
> > + * @a_periph: Image smoothing perpherial, u5.0.
> > + * @__reserved1: reserved
> > + * @a_cent: Image Smoothing center coefficient, u5.0.
> > + * @__reserved2: reserved
> > + * @enable: 0: Y_EE_NR disabled, output = input; 1: Y_EE_NR enabled.
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config {
> > +	__u32 a_diag:5;
> > +	__u32 __reserved0:3;
> > +	__u32 a_periph:5;
> > +	__u32 __reserved1:3;
> > +	__u32 a_cent:5;
> > +	__u32 __reserved2:9;
> > +	__u32 enable:1;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_sense_config - Luma(Y) edge enhancement
> > + *					noise reduction sensitivity gains
> > + *
> > + * @edge_sense_0: Sensitivity of edge in dark area. u13.0, default 8191.
> > + * @__reserved0: reserved
> > + * @delta_edge_sense: Difference in the sensitivity of edges between
> > + *		      the bright and dark areas. u13.0, default 0.
> > + * @__reserved1: reserved
> > + * @corner_sense_0: Sensitivity of corner in dark area. u13.0, default 0.
> > + * @__reserved2: reserved
> > + * @delta_corner_sense: Difference in the sensitivity of corners between
> > + *			the bright and dark areas. u13.0, default 8191.
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_sense_config {
> > +	__u32 edge_sense_0:13;
> > +	__u32 __reserved0:3;
> > +	__u32 delta_edge_sense:13;
> > +	__u32 __reserved1:3;
> > +	__u32 corner_sense_0:13;
> > +	__u32 __reserved2:3;
> > +	__u32 delta_corner_sense:13;
> > +	__u32 __reserved3:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_gain_config - Luma(Y) edge enhancement
> > + *						noise reduction gain config
> > + *
> > + * @gain_pos_0: Gain for positive edge in dark area. u5.0, [0,16], default 2.
> > + * @__reserved0: reserved
> > + * @delta_gain_posi: Difference in the gain of edges between the bright and
> > + *		     dark areas for positive edges. u5.0, [0,16], default 0.
> > + * @__reserved1: reserved
> > + * @gain_neg_0: Gain for negative edge in dark area. u5.0, [0,16], default 8.
> > + * @__reserved2: reserved
> > + * @delta_gain_neg: Difference in the gain of edges between the bright and
> > + *		    dark areas for negative edges. u5.0, [0,16], default 0.
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_gain_config {
> > +	__u32 gain_pos_0:5;
> > +	__u32 __reserved0:3;
> > +	__u32 delta_gain_posi:5;
> > +	__u32 __reserved1:3;
> > +	__u32 gain_neg_0:5;
> > +	__u32 __reserved2:3;
> > +	__u32 delta_gain_neg:5;
> > +	__u32 __reserved3:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_clip_config - Luma(Y) edge enhancement
> > + *					noise reduction clipping config
> > + *
> > + * @clip_pos_0: Limit of positive edge in dark area
> > + * @__reserved0: reserved
> > + * @delta_clip_posi: Difference in the limit of edges between the bright
> > + *		     and dark areas for positive edges.
> > + * @__reserved1: reserved
> > + * @clip_neg_0: Limit of negative edge in dark area
> > + * @__reserved2: reserved
> > + * @delta_clip_neg: Difference in the limit of edges between the bright
> > + *		    and dark areas for negative edges.
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_clip_config {
> > +	__u32 clip_pos_0:5;
> > +	__u32 __reserved0:3;
> > +	__u32 delta_clip_posi:5;
> > +	__u32 __reserved1:3;
> > +	__u32 clip_neg_0:5;
> > +	__u32 __reserved2:3;
> > +	__u32 delta_clip_neg:5;
> > +	__u32 __reserved3:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_frng_config - Luma(Y) edge enhancement
> > + *						noise reduction fringe config
> > + *
> > + * @gain_exp: Common exponent of gains, u4, [0,8], default 2.
> > + * @__reserved0: reserved
> > + * @min_edge: Threshold for edge and smooth stitching, u13.
> > + * @__reserved1: reserved
> > + * @lin_seg_param: Power of LinSeg, u4.
> > + * @__reserved2: reserved
> > + * @t1: Parameter for enabling/disabling the edge enhancement, u1.0, [0,1],
> > + *	default 1.
> > + * @t2: Parameter for enabling/disabling the smoothing, u1.0, [0,1],
> > + *	default 1.
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_frng_config {
> > +	__u32 gain_exp:4;
> > +	__u32 __reserved0:28;
> > +	__u32 min_edge:13;
> > +	__u32 __reserved1:3;
> > +	__u32 lin_seg_param:4;
> > +	__u32 __reserved2:4;
> > +	__u32 t1:1;
> > +	__u32 t2:1;
> > +	__u32 __reserved3:6;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_diag_config - Luma(Y) edge enhancement
> > + *					noise reduction diagonal config
> > + *
> > + * @diag_disc_g: Coefficient that prioritize diagonal edge direction on
> > + *		 horizontal or vertical for final enhancement.
> > + *		 u4.0, [1,15], default 1.
> > + * @__reserved0: reserved
> > + * @hvw_hor: Weight of horizontal/vertical edge enhancement for hv edge.
> > + *		u2.2, [1,15], default 4.
> > + * @dw_hor: Weight of diagonal edge enhancement for hv edge.
> > + *		u2.2, [1,15], default 1.
> > + * @hvw_diag: Weight of horizontal/vertical edge enhancement for diagonal edge.
> > + *		u2.2, [1,15], default 1.
> > + * @dw_diag: Weight of diagonal edge enhancement for diagonal edge.
> > + *		u2.2, [1,15], default 4.
> > + * @__reserved1: reserved
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_diag_config {
> > +	__u32 diag_disc_g:4;
> > +	__u32 __reserved0:4;
> > +	__u32 hvw_hor:4;
> > +	__u32 dw_hor:4;
> > +	__u32 hvw_diag:4;
> > +	__u32 dw_diag:4;
> > +	__u32 __reserved1:8;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config - Luma(Y) edge enhancement
> > + *		noise reduction false color correction (FCC) coring config
> > + *
> > + * @pos_0: Gain for positive edge in dark, u13.0, [0..16], default 0.
> > + * @__reserved0: reserved
> > + * @pos_delta: Gain for positive edge in bright, value: pos_0 + pos_delta <=16
> > + *		u13.0, default 0.
> > + * @__reserved1: reserved
> > + * @neg_0: Gain for negative edge in dark area, u13.0, range [0..16], default 0.
> > + * @__reserved2: reserved
> > + * @neg_delta: Gain for negative edge in bright area. neg_0 + neg_delta <=16
> > + *		u13.0, default 0.
> > + * @__reserved3: reserved
> > + *
> > + * Coring is a simple soft thresholding technique.
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config {
> > +	__u32 pos_0:13;
> > +	__u32 __reserved0:3;
> > +	__u32 pos_delta:13;
> > +	__u32 __reserved1:3;
> > +	__u32 neg_0:13;
> > +	__u32 __reserved2:3;
> > +	__u32 neg_delta:13;
> > +	__u32 __reserved3:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp1_y_ee_nr_config - Edge enhancement and noise reduction
> > + *
> > + * @lpf: low-pass filter config. See &ipu3_uapi_yuvp1_y_ee_nr_lpf_config
> > + * @sense: sensitivity config. See &ipu3_uapi_yuvp1_y_ee_nr_sense_config
> > + * @gain: gain config as defined in &ipu3_uapi_yuvp1_y_ee_nr_gain_config
> > + * @clip: clip config as defined in &ipu3_uapi_yuvp1_y_ee_nr_clip_config
> > + * @frng: fringe config as defined in &ipu3_uapi_yuvp1_y_ee_nr_frng_config
> > + * @diag: diagonal edge config. See &ipu3_uapi_yuvp1_y_ee_nr_diag_config
> > + * @fc_coring: coring config for fringe control. See
> > + *	       &ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config
> > + */
> > +struct ipu3_uapi_yuvp1_y_ee_nr_config {
> > +	struct ipu3_uapi_yuvp1_y_ee_nr_lpf_config lpf;
> > +	struct ipu3_uapi_yuvp1_y_ee_nr_sense_config sense;
> > +	struct ipu3_uapi_yuvp1_y_ee_nr_gain_config gain;
> > +	struct ipu3_uapi_yuvp1_y_ee_nr_clip_config clip;
> > +	struct ipu3_uapi_yuvp1_y_ee_nr_frng_config frng;
> > +	struct ipu3_uapi_yuvp1_y_ee_nr_diag_config diag;
> > +	struct ipu3_uapi_yuvp1_y_ee_nr_fc_coring_config fc_coring;
> > +} __packed;
> > +
> > +/* Total Color Correction */
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp2_tcc_gen_control_static_config - Total color correction
> > + *				general control config
> > + *
> > + * @en:	0 – TCC disabled. Output = input 1 – TCC enabled.
> > + * @blend_shift:	blend shift, Range[3,4]
> > + * @gain_according_to_y_only:	0: Gain is calculated according to YUV,
> > + *				1: Gain is calculated according to Y only
> > + * @__reserved0: reserved
> > + * @gamma:	Final blending coefficients.
> > + * @__reserved1: reserved
> > + * @delta:	Final blending coefficients.
> > + * @__reserved2: reserved
> > + */
> > +struct ipu3_uapi_yuvp2_tcc_gen_control_static_config {
> > +	__u32 en:1;
> > +	__u32 blend_shift:3;
> > +	__u32 gain_according_to_y_only:1;
> > +	__u32 __reserved0:11;
> > +	__s32 gamma:5;
> > +	__u32 __reserved1:3;
> > +	__s32 delta:5;
> > +	__u32 __reserved2:3;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config - Total color correction
> > + *				multi-axis color control (MACC) config
> > + *
> > + * @a: a coefficient for 2x2 MACC conversion matrix.
> > + * @__reserved0: reserved
> > + * @b: b coefficient  2x2 MACC conversion matrix.
> > + * @__reserved1: reserved
> > + * @c: c coefficient for 2x2 MACC conversion matrix.
> > + * @__reserved2: reserved
> > + * @d: d coefficient for 2x2 MACC conversion matrix.
> > + * @__reserved3: reserved
> > + */
> > +struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config {
> > +	__s32 a:12;
> > +	__u32 __reserved0:4;
> > +	__s32 b:12;
> > +	__u32 __reserved1:4;
> > +	__s32 c:12;
> > +	__u32 __reserved2:4;
> > +	__s32 d:12;
> > +	__u32 __reserved3:4;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp2_tcc_macc_table_static_config - Total color correction
> > + *				multi-axis color control (MACC) table array
> > + *
> > + * @entries: config for multi axis color correction, as specified by
> > + *	     &ipu3_uapi_yuvp2_tcc_macc_elem_static_config
> > + */
> > +struct ipu3_uapi_yuvp2_tcc_macc_table_static_config {
> > +	struct ipu3_uapi_yuvp2_tcc_macc_elem_static_config
> > +		entries[IPU3_UAPI_YUVP2_TCC_MACC_TABLE_ELEMENTS];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config - Total color correction
> > + *				inverse y lookup table
> > + *
> > + * @entries: lookup table for inverse y estimation, and use it to estimate the
> > + *	     ratio between luma and chroma. Chroma by approximate the absolute
> > + *	     value of the radius on the chroma plane (R = sqrt(u^2+v^2) ) and
> > + *	     luma by approximate by 1/Y.
> > + */
> > +struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config {
> > +	__u16 entries[IPU3_UAPI_YUVP2_TCC_INV_Y_LUT_ELEMENTS];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config - Total color
> > + *					correction lookup table for PCWL
> > + *
> > + * @entries: lookup table for gain piece wise linear transformation (PCWL)
> > + */
> > +struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config {
> > +	__u16 entries[IPU3_UAPI_YUVP2_TCC_GAIN_PCWL_LUT_ELEMENTS];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config - Total color correction
> > + *				lookup table for r square root
> > + *
> > + * @entries: lookup table for r square root estimation
> > + */
> > +struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config {
> > +	__s16 entries[IPU3_UAPI_YUVP2_TCC_R_SQR_LUT_ELEMENTS];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_yuvp2_tcc_static_config- Total color correction static
> > + *
> > + * @gen_control: general config for Total Color Correction
> > + * @macc_table: config for multi axis color correction
> > + * @inv_y_lut: lookup table for inverse y estimation
> > + * @gain_pcwl: lookup table for gain PCWL
> > + * @r_sqr_lut: lookup table for r square root estimation.
> > + */
> > +struct ipu3_uapi_yuvp2_tcc_static_config {
> > +	struct ipu3_uapi_yuvp2_tcc_gen_control_static_config gen_control;
> > +	struct ipu3_uapi_yuvp2_tcc_macc_table_static_config macc_table;
> > +	struct ipu3_uapi_yuvp2_tcc_inv_y_lut_static_config inv_y_lut;
> > +	struct ipu3_uapi_yuvp2_tcc_gain_pcwl_lut_static_config gain_pcwl;
> > +	struct ipu3_uapi_yuvp2_tcc_r_sqr_lut_static_config r_sqr_lut;
> > +} __packed;
> > +
> > +/* Advanced Noise Reduction related structs */
> > +
> > +/*
> > + * struct ipu3_uapi_anr_alpha - Advanced noise reduction alpha
> > + *
> > + * Tunable parameters that are subject to modification according to the
> > + * total gain used.
> > + */
> > +struct ipu3_uapi_anr_alpha {
> > +	__u16 gr;
> > +	__u16 r;
> > +	__u16 b;
> > +	__u16 gb;
> > +	__u16 dc_gr;
> > +	__u16 dc_r;
> > +	__u16 dc_b;
> > +	__u16 dc_gb;
> > +} __packed;
> > +
> > +/*
> > + * struct ipu3_uapi_anr_beta - Advanced noise reduction beta
> > + *
> > + * Tunable parameters that are subject to modification according to the
> > + * total gain used.
> > + */
> > +struct ipu3_uapi_anr_beta {
> > +	__u16 beta_gr;
> > +	__u16 beta_r;
> > +	__u16 beta_b;
> > +	__u16 beta_gb;
> > +} __packed;
> > +
> > +/*
> > + * struct ipu3_uapi_anr_plain_color - Advanced noise reduction plain color with
> > + *				      4x4 matrix
> > + *
> > + * Tunable parameters that are subject to modification according to the
> > + * total gain used.
> > + */
> > +struct ipu3_uapi_anr_plain_color {
> > +	__u16 reg_w_gr[16];
> > +	__u16 reg_w_r[16];
> > +	__u16 reg_w_b[16];
> > +	__u16 reg_w_gb[16];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_anr_transform_config - Advanced noise reduction transform
> > + *
> > + * @enable: advanced noise reduction enabled.
> > + * @adaptive_treshhold_en: On IPU3, adaptive threshold is always enabled.
> > + * @__reserved1: reserved
> > + * @__reserved2: reserved
> > + * @alpha: using follow defaults:  
> 
> follow -> following
> 
> > + *		13, 13, 13, 13, 0, 0, 0, 0
> > + *		11, 11, 11, 11, 0, 0, 0, 0
> > + *		14,  14, 14, 14, 0, 0, 0, 0
> > + * @beta: use following defaults:
> > + *		24, 24, 24, 24
> > + *		21, 20, 20, 21
> > + *		25, 25, 25, 25
> > + * @color: use defaults defined in driver/media/pci/intel/ipu3-tables.c
> > + * @sqrt_lut: 11 bits per element, values =
> > + *					[724 768 810 849 887
> > + *					923 958 991 1024 1056
> > + *					1116 1145 1173 1201 1086
> > + *					1228 1254 1280 1305 1330
> > + *					1355 1379 1402 1425 1448]
> > + * @xreset: Reset value of X for r^2 calculation Value: col_start-X_center
> > + *	Constraint: Xreset + FrameWdith≤4095 Xreset≥ -4095, default -1632.
> > + * @__reserved3: reserved
> > + * @yreset: Reset value of Y for r^2 calculation Value: row_start-Y_center
> > + *	 Constraint: Yreset + FrameHeight≤4095 Yreset≥ -4095, default -1224.
> > + * @__reserved4: reserved
> > + * @x_sqr_reset: Reset value of X^2 for r^2 calculation Value = (Xreset)^2
> > + * @r_normfactor: Normalization factor for R. Default 14.
> > + * @__reserved5: reserved
> > + * @y_sqr_reset: Reset value of Y^2 for r^2 calculation Value = (Yreset)^2
> > + * @gain_scale: Parameter describing shading gain as a function of distance
> > + *		from the image center.
> > + *		A single value per frame, loaded by the driver. Default 115.
> > + */
> > +struct ipu3_uapi_anr_transform_config {
> > +	__u32 enable:1;			/* 0 or 1, disabled or enabled */
> > +	__u32 adaptive_treshhold_en:1;	/* On IPU3, always enabled */
> > +
> > +	__u32 __reserved1:30;
> > +	__u8 __reserved2[44];
> > +
> > +	struct ipu3_uapi_anr_alpha alpha[3];
> > +	struct ipu3_uapi_anr_beta beta[3];
> > +	struct ipu3_uapi_anr_plain_color color[3];
> > +
> > +	__u16 sqrt_lut[IPU3_UAPI_ANR_LUT_SIZE];	/* 11 bits per element */
> > +
> > +	__s16 xreset:13;
> > +	__u16 __reserved3:3;
> > +	__s16 yreset:13;
> > +	__u16 __reserved4:3;
> > +
> > +	__u32 x_sqr_reset:24;
> > +	__u32 r_normfactor:5;
> > +	__u32 __reserved5:3;
> > +
> > +	__u32 y_sqr_reset:24;
> > +	__u32 gain_scale:8;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_anr_stitch_pyramid - ANR stitch pyramid
> > + *
> > + * @entry0: pyramid LUT entry0, range [0x0..0x3F]
> > + * @entry1: pyramid LUT entry1, range [0x0..0x3F]
> > + * @entry2: pyramid LUT entry2, range [0x0..0x3F]
> > + * @__reserved: reserved
> > + */
> > +struct ipu3_uapi_anr_stitch_pyramid {
> > +	__u32 entry0:6;
> > +	__u32 entry1:6;
> > +	__u32 entry2:6;
> > +	__u32 __reserved:14;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_anr_stitch_config - ANR stitch config
> > + *
> > + * @anr_stitch_en: enable stitch. Enabled with 1.
> > + * @__reserved: reserved
> > + * @pyramid: pyramid table as defined by &ipu3_uapi_anr_stitch_pyramid
> > + *		default values:
> > + *		{ 1, 3, 5 }, { 7, 7, 5 }, { 3, 1, 3 },
> > + *		{ 9, 15, 21 }, { 21, 15, 9 }, { 3, 5, 15 },
> > + *		{ 25, 35, 35 }, { 25, 15, 5 }, { 7, 21, 35 },
> > + *		{ 49, 49, 35 }, { 21, 7, 7 }, { 21, 35, 49 },
> > + *		{ 49, 35, 21 }, { 7, 5, 15 }, { 25, 35, 35 },
> > + *		{ 25, 15, 5 }, { 3, 9, 15 }, { 21, 21, 15 },
> > + *		{ 9, 3, 1 }, { 3, 5, 7 }, { 7, 5, 3}, { 1 }
> > + */
> > +struct ipu3_uapi_anr_stitch_config {
> > +	__u32 anr_stitch_en;
> > +	__u8 __reserved[44];

Better to use __aligned() here and on other similar places where you
added __reserved fields.

> > +	struct ipu3_uapi_anr_stitch_pyramid pyramid[IPU3_UAPI_ANR_PYRAMID_SIZE];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_anr_config - ANR config
> > + *
> > + * @__reserved1: reserved
> > + * @transform:	advanced noise reduction transform config as specified by
> > + *		&ipu3_uapi_anr_transform_config
> > + * @stitch: create 4x4 patch from 4 surrounding 8x8 patches.
> > + * @__reserved2: reserved
> > + */
> > +struct ipu3_uapi_anr_config {
> > +	IPU3_ALIGN __u8 __reserved1[8];
> > +	IPU3_ALIGN struct ipu3_uapi_anr_transform_config transform;
> > +	IPU3_ALIGN struct ipu3_uapi_anr_stitch_config stitch;
> > +	IPU3_ALIGN __u8 __reserved2[8];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_acc_param - Accelerator cluster parameters
> > + *
> > + * ACC refers to the HW cluster containing all Fixed Functions(FFs). Each FF
> > + * implements a specific algorithm.
> > + *
> > + * @bnr:	parameters for bayer noise reduction static config. See
> > + *		&ipu3_uapi_bnr_static_config
> > + * @green_disparity:	disparity static config between gr and gb channel.
> > + *			See &ipu3_uapi_bnr_static_config_green_disparity
> > + * @dm:	de-mosaic config. See &ipu3_uapi_dm_config
> > + * @ccm:	color correction matrix. See &ipu3_uapi_ccm_mat_config
> > + * @gamma:	gamma correction config. See &ipu3_uapi_gamma_config
> > + * @csc:	color space conversion matrix. See &ipu3_uapi_csc_mat_config
> > + * @cds:	color down sample config. See &ipu3_uapi_cds_params
> > + * @shd:	lens shading correction config. See &ipu3_uapi_shd_config
> > + * @iefd:	Image enhancement filter and denoise config.
> > + *		&ipu3_uapi_yuvp1_iefd_config
> > + * @yds_c0:	y down scaler config. &ipu3_uapi_yuvp1_yds_config
> > + * @chnr_c0:	chroma noise reduction config. &ipu3_uapi_yuvp1_chnr_config
> > + * @y_ee_nr:	y edge enhancement and noise reduction config.
> > + *		&ipu3_uapi_yuvp1_y_ee_nr_config
> > + * @yds:	y down scaler config. See &ipu3_uapi_yuvp1_yds_config
> > + * @chnr:	chroma noise reduction config. See &ipu3_uapi_yuvp1_chnr_config
> > + * @__reserved1: reserved
> > + * @yds2:	y channel down scaler config. See &ipu3_uapi_yuvp1_yds_config
> > + * @tcc:	total color correction config as defined in struct
> > + *		&ipu3_uapi_yuvp2_tcc_static_config
> > + * @__reserved2: reserved
> > + * @anr:	advanced noise reduction config.See &ipu3_uapi_anr_config
> > + * @awb_fr:	AWB filter response config. See ipu3_uapi_awb_fr_config
> > + * @ae:	auto exposure config  As specified by &ipu3_uapi_ae_config
> > + * @af:	auto focus config. As specified by &ipu3_uapi_af_config
> > + * @awb:	auto white balance config. As specified by &ipu3_uapi_awb_config
> > + */
> > +struct ipu3_uapi_acc_param {
> > +	struct ipu3_uapi_bnr_static_config bnr;
> > +	IPU3_ALIGN struct ipu3_uapi_bnr_static_config_green_disparity
> > +				green_disparity;
> > +	IPU3_ALIGN struct ipu3_uapi_dm_config dm;
> > +	IPU3_ALIGN struct ipu3_uapi_ccm_mat_config ccm;
> > +	IPU3_ALIGN struct ipu3_uapi_gamma_config gamma;
> > +	IPU3_ALIGN struct ipu3_uapi_csc_mat_config csc;
> > +	IPU3_ALIGN struct ipu3_uapi_cds_params cds;
> > +	IPU3_ALIGN struct ipu3_uapi_shd_config shd;
> > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_iefd_config iefd;
> > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds_c0;
> > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_chnr_config chnr_c0;
> > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_y_ee_nr_config y_ee_nr;
> > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds;
> > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_chnr_config chnr;
> > +	IPU3_ALIGN __u8 __reserved1[516];

Wow! lots of empty space here! I would, instead, do something like:

struct ipu3_uapi_yuvp1_chnr_config chnr __aligned(IPU3_ALIGN * 517);

> > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds2;
> > +	IPU3_ALIGN struct ipu3_uapi_yuvp2_tcc_static_config tcc;
> > +	__u8 __reserved2[1152];

and something similar here.

> > +	struct ipu3_uapi_anr_config anr;
> > +	struct ipu3_uapi_awb_fr_config awb_fr;
> > +	struct ipu3_uapi_ae_config ae;
> > +	struct ipu3_uapi_af_config af;
> > +	struct ipu3_uapi_awb_config awb;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_isp_lin_vmem_params - Linearization parameters
> > + *
> > + * @lin_lutlow_gr: linearization look-up table for GR channel interpolation.
> > + * @lin_lutlow_r: linearization look-up table for R channel interpolation.
> > + * @lin_lutlow_b: linearization look-up table for B channel interpolation.
> > + * @lin_lutlow_gb: linearization look-up table for GB channel interpolation.
> > + *			lin_lutlow_gr / lin_lutlow_gr / lin_lutlow_gr /
> > + *			lin_lutlow_gr <= LIN_MAX_VALUE - 1.
> > + * @lin_lutdif_gr:	lin_lutlow_gr[i+1] - lin_lutlow_gr[i].
> > + * @lin_lutdif_r:	lin_lutlow_r[i+1] - lin_lutlow_r[i].
> > + * @lin_lutdif_b:	lin_lutlow_b[i+1] - lin_lutlow_b[i].
> > + * @lin_lutdif_gb:	lin_lutlow_gb[i+1] - lin_lutlow_gb[i].
> > + */
> > +struct ipu3_uapi_isp_lin_vmem_params {
> > +	__s16 lin_lutlow_gr[IPU3_UAPI_LIN_LUT_SIZE];
> > +	__s16 lin_lutlow_r[IPU3_UAPI_LIN_LUT_SIZE];
> > +	__s16 lin_lutlow_b[IPU3_UAPI_LIN_LUT_SIZE];
> > +	__s16 lin_lutlow_gb[IPU3_UAPI_LIN_LUT_SIZE];
> > +	__s16 lin_lutdif_gr[IPU3_UAPI_LIN_LUT_SIZE];
> > +	__s16 lin_lutdif_r[IPU3_UAPI_LIN_LUT_SIZE];
> > +	__s16 lin_lutdif_b[IPU3_UAPI_LIN_LUT_SIZE];
> > +	__s16 lin_lutdif_gb[IPU3_UAPI_LIN_LUT_SIZE];
> > +} __packed;
> > +
> > +/* Temporal Noise Reduction */
> > +
> > +/**
> > + * struct ipu3_uapi_isp_tnr3_vmem_params - Temporal noise reduction vector
> > + *					   memory parameters
> > + *
> > + * @slope: slope setting in interpolation curve for temporal noise reduction.
> > + * @__reserved1: reserved
> > + * @sigma: knee point setting in interpolation curve for temporal
> > + *	   noise reduction.
> > + * @__reserved2: reserved
> > + */
> > +struct ipu3_uapi_isp_tnr3_vmem_params {
> > +	__u16 slope[IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> > +	__u16 __reserved1[IPU3_UAPI_ISP_VEC_ELEMS
> > +						- IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> > +	__u16 sigma[IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> > +	__u16 __reserved2[IPU3_UAPI_ISP_VEC_ELEMS
> > +						- IPU3_UAPI_ISP_TNR3_VMEM_LEN];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_isp_tnr3_params - Temporal noise reduction v3 parameters
> > + *
> > + * @knee_y1: Knee point TNR3 assumes standard deviation of Y,U and
> > + *	V at Y1 are TnrY1_Sigma_Y, U and V.
> > + * @knee_y2: Knee point TNR3 assumes standard deviation of Y,U and
> > + *		V at Y2 are TnrY2_Sigma_Y, U and V.
> > + * @maxfb_y: Max feedback gain for Y
> > + * @maxfb_u: Max feedback gain for U
> > + * @maxfb_v: Max feedback gain for V
> > + * @round_adj_y: rounding Adjust for Y
> > + * @round_adj_u: rounding Adjust for U
> > + * @round_adj_v: rounding Adjust for V
> > + * @ref_buf_select: selection of the reference frame buffer to be used.
> > + */
> > +struct ipu3_uapi_isp_tnr3_params {
> > +	__u32 knee_y1;
> > +	__u32 knee_y2;
> > +	__u32 maxfb_y;
> > +	__u32 maxfb_u;
> > +	__u32 maxfb_v;
> > +	__u32 round_adj_y;
> > +	__u32 round_adj_u;
> > +	__u32 round_adj_v;
> > +	__u32 ref_buf_select;
> > +} __packed;
> > +
> > +/* Extreme Noise Reduction version 3 */
> > +
> > +/**
> > + * struct ipu3_uapi_isp_xnr3_vmem_params - Extreme noise reduction v3
> > + *					   vector memory parameters
> > + *
> > + * @x: xnr3 parameters.
> > + * @a: xnr3 parameters.
> > + * @b: xnr3 parameters.
> > + * @c: xnr3 parameters.
> > + */
> > +struct ipu3_uapi_isp_xnr3_vmem_params {
> > +	__u16 x[IPU3_UAPI_ISP_VEC_ELEMS];
> > +	__u16 a[IPU3_UAPI_ISP_VEC_ELEMS];
> > +	__u16 b[IPU3_UAPI_ISP_VEC_ELEMS];
> > +	__u16 c[IPU3_UAPI_ISP_VEC_ELEMS];
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_xnr3_alpha_params - Extreme noise reduction v3
> > + *					alpha tuning parameters
> > + *
> > + * @y0: Sigma for Y range similarity in dark area.
> > + * @u0: Sigma for U range similarity in dark area.
> > + * @v0: Sigma for V range similarity in dark area.
> > + * @ydiff: Sigma difference for Y between bright area and dark area.
> > + * @udiff: Sigma difference for U between bright area and dark area.
> > + * @vdiff: Sigma difference for V between bright area and dark area.
> > + */
> > +struct ipu3_uapi_xnr3_alpha_params {
> > +	__u32 y0;
> > +	__u32 u0;
> > +	__u32 v0;
> > +	__u32 ydiff;
> > +	__u32 udiff;
> > +	__u32 vdiff;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_xnr3_coring_params - Extreme noise reduction v3
> > + *					 coring parameters
> > + *
> > + * @u0: Coring Threshold of U channel in dark area.
> > + * @v0: Coring Threshold of V channel in dark area.
> > + * @udiff: Threshold difference of U channel between bright and dark area.
> > + * @vdiff: Threshold difference of V channel between bright and dark area.
> > + */
> > +struct ipu3_uapi_xnr3_coring_params {
> > +	__u32 u0;
> > +	__u32 v0;
> > +	__u32 udiff;
> > +	__u32 vdiff;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_xnr3_blending_params - Blending factor
> > + *
> > + * @strength: The factor for blending output with input. This is tuning
> > + *	      parameterHigher values lead to more aggressive XNR operation.
> > + */
> > +struct ipu3_uapi_xnr3_blending_params {
> > +	__u32 strength;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_isp_xnr3_params - Extreme noise reduction v3 parameters
> > + *
> > + * @alpha: parameters for xnr3 alpha. See &ipu3_uapi_xnr3_alpha_params
> > + * @coring: parameters for xnr3 coring. See &ipu3_uapi_xnr3_coring_params
> > + * @blending: parameters for xnr3 blending. See &ipu3_uapi_xnr3_blending_params
> > + */
> > +struct ipu3_uapi_isp_xnr3_params {
> > +	struct ipu3_uapi_xnr3_alpha_params alpha;
> > +	struct ipu3_uapi_xnr3_coring_params coring;
> > +	struct ipu3_uapi_xnr3_blending_params blending;
> > +} __packed;
> > +
> > +/***** Obgrid (optical black level compensation) table entry *****/
> > +
> > +/**
> > + * struct ipu3_uapi_obgrid_param - Optical black level compensation parameters
> > + *
> > + * @gr: Grid table values for color GR
> > + * @r: Grid table values for color R
> > + * @b: Grid table values for color B
> > + * @gb: Grid table values for color GB
> > + *
> > + * Black level is different for red, green, and blue channels. So black level
> > + * compensation is different per channel.
> > + */
> > +struct ipu3_uapi_obgrid_param {
> > +	__u16 gr;
> > +	__u16 r;
> > +	__u16 b;
> > +	__u16 gb;
> > +} __packed;
> > +
> > +/******************* V4L2_META_FMT_IPU3_PARAMS *******************/
> > +
> > +/**
> > + * struct ipu3_uapi_flags - bits to indicate which pipeline needs update
> > + *
> > + * @gdc: 0 = no update, 1 = update.
> > + * @obgrid: 0 = no update, 1 = update.
> > + * @__reserved1: Not used.
> > + * @acc_bnr: 0 = no update, 1 = update.
> > + * @acc_green_disparity: 0 = no update, 1 = update.
> > + * @acc_dm: 0 = no update, 1 = update.
> > + * @acc_ccm: 0 = no update, 1 = update.
> > + * @acc_gamma: 0 = no update, 1 = update.
> > + * @acc_csc: 0 = no update, 1 = update.
> > + * @acc_cds: 0 = no update, 1 = update.
> > + * @acc_shd: 0 = no update, 1 = update.
> > + * @__reserved2: Not used.
> > + * @acc_iefd: 0 = no update, 1 = update.
> > + * @acc_yds_c0: 0 = no update, 1 = update.
> > + * @acc_chnr_c0: 0 = no update, 1 = update.
> > + * @acc_y_ee_nr: 0 = no update, 1 = update.
> > + * @acc_yds: 0 = no update, 1 = update.
> > + * @acc_chnr: 0 = no update, 1 = update.
> > + * @acc_ytm: 0 = no update, 1 = update.
> > + * @acc_yds2: 0 = no update, 1 = update.
> > + * @acc_tcc: 0 = no update, 1 = update.
> > + * @acc_dpc: 0 = no update, 1 = update.
> > + * @acc_bds: 0 = no update, 1 = update.
> > + * @acc_anr: 0 = no update, 1 = update.
> > + * @acc_awb_fr: 0 = no update, 1 = update.
> > + * @acc_ae: 0 = no update, 1 = update.
> > + * @acc_af: 0 = no update, 1 = update.
> > + * @acc_awb: 0 = no update, 1 = update.
> > + * @__acc_osys: 0 = no update, 1 = update.
> > + * @__reserved3: Not used.
> > + * @lin_vmem_params: 0 = no update, 1 = update.
> > + * @tnr3_vmem_params: 0 = no update, 1 = update.
> > + * @xnr3_vmem_params: 0 = no update, 1 = update.
> > + * @tnr3_dmem_params: 0 = no update, 1 = update.
> > + * @xnr3_dmem_params: 0 = no update, 1 = update.
> > + * @__reserved4: Not used.
> > + * @obgrid_param: 0 = no update, 1 = update.
> > + * @__reserved5: Not used.
> > + */
> > +struct ipu3_uapi_flags {
> > +	__u32 gdc:1;
> > +	__u32 obgrid:1;
> > +	__u32 __reserved1:32;
> > +
> > +	__u32 acc_bnr:1;
> > +	__u32 acc_green_disparity:1;
> > +	__u32 acc_dm:1;
> > +	__u32 acc_ccm:1;
> > +	__u32 acc_gamma:1;
> > +	__u32 acc_csc:1;
> > +	__u32 acc_cds:1;
> > +	__u32 acc_shd:1;
> > +	__u32 __reserved2:2;
> > +	__u32 acc_iefd:1;
> > +	__u32 acc_yds_c0:1;
> > +	__u32 acc_chnr_c0:1;
> > +	__u32 acc_y_ee_nr:1;
> > +	__u32 acc_yds:1;
> > +	__u32 acc_chnr:1;
> > +	__u32 acc_ytm:1;
> > +	__u32 acc_yds2:1;
> > +	__u32 acc_tcc:1;
> > +	__u32 acc_dpc:1;
> > +	__u32 acc_bds:1;
> > +	__u32 acc_anr:1;
> > +	__u32 acc_awb_fr:1;
> > +	__u32 acc_ae:1;
> > +	__u32 acc_af:1;
> > +	__u32 acc_awb:1;
> > +	__u32 __reserved3:4;
> > +
> > +	__u32 lin_vmem_params:1;
> > +	__u32 tnr3_vmem_params:1;
> > +	__u32 xnr3_vmem_params:1;
> > +	__u32 tnr3_dmem_params:1;
> > +	__u32 xnr3_dmem_params:1;
> > +	__u32 __reserved4:1;
> > +	__u32 obgrid_param:1;
> > +	__u32 __reserved5:25;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_params - V4L2_META_FMT_IPU3_PARAMS
> > + *
> > + * @use:	select which parameters to apply, see &ipu3_uapi_flags
> > + * @acc_param:	ACC parameters, as specified by &ipu3_uapi_acc_param
> > + * @lin_vmem_params:	linearization VMEM, as specified by
> > + *			&ipu3_uapi_isp_lin_vmem_params
> > + * @tnr3_vmem_params:	tnr3 VMEM as specified by
> > + *			&ipu3_uapi_isp_tnr3_vmem_params
> > + * @xnr3_vmem_params:	xnr3 VMEM as specified by
> > + *			&ipu3_uapi_isp_xnr3_vmem_params
> > + * @tnr3_dmem_params:	tnr3 DMEM as specified by &ipu3_uapi_isp_tnr3_params
> > + * @xnr3_dmem_params:	xnr3 DMEM as specified by &ipu3_uapi_isp_xnr3_params
> > + * @obgrid_param:	obgrid parameters as specified by
> > + *			&ipu3_uapi_obgrid_param
> > + *
> > + * The video queue "parameters" is of format V4L2_META_FMT_IPU3_PARAMS.
> > + * This is a "single plane" v4l2_meta_format using V4L2_BUF_TYPE_META_OUTPUT.
> > + *
> > + * struct ipu3_uapi_params as defined below contains a lot of parameters and
> > + * ipu3_uapi_flags selects which parameters to apply.
> > + */
> > +struct ipu3_uapi_params {
> > +	/* Flags which of the settings below are to be applied */
> > +	IPU3_ALIGN struct ipu3_uapi_flags use;
> > +
> > +	/* Accelerator cluster parameters */
> > +	struct ipu3_uapi_acc_param acc_param;
> > +
> > +	/* ISP vector address space parameters */
> > +	struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
> > +	struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
> > +	struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
> > +
> > +	/* ISP data memory (DMEM) parameters */
> > +	struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
> > +	struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
> > +
> > +	/* Optical black level compensation */
> > +	struct ipu3_uapi_obgrid_param obgrid_param;
> > +} __packed;
> > +
> > +#endif
> >   
> 
> So the level of documentation looks good to me.

Same for me. See above for my comments.

> The use of IPU3_ALIGN, padding and reserved fields
> seems a bit of a mix to me, it's not always clear why a certain approach is taken.
> 
> Did you check if the layout of all these structs is the same between 32 and 64 bit code?
> I would recommend that you automate this (e.g. abi-dumper might be useful for this).
> I do need to have confirmation that they are indeed identical.

Yeah, adding a 32 bits compat code here would be really painful. Let's
avoid it if possible.

> 
> Finally I think we need a high-level description of how to use this:
> 
> I gather that with struct ipu3_uapi_flags you can indicate which blocks need to be updated,
> and that for those blocks that do not need updating the corresponding structs are ignored.
> If so, then that should be documented in pixfmt-meta-intel-ipu3.rst.
> 
> And what about the initial values? E.g. after a reboot, do all the blocks have sane default
> values? Or do you need to supply those yourself? And if it is the latter, then we need
> some open source example code that programs it with sane values. Users can take that as a
> starting point and modify it.
> 
> If userspace needs to provide sane initial values, then it would be best if code
> is added to v4l2-utils under contrib. Perhaps under a dual GPL/BSD license?
> 
> Regards,
> 
> 	Hans



Thanks,
Mauro

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Sakari Ailus]

Hi Mauro,

On Mon, Aug 13, 2018 at 05:50:00PM -0300, Mauro Carvalho Chehab wrote:
...
> > > +
> > > +/******************* ipu3_uapi_stats_3a *******************/
> > > +
> > > +#define IPU3_UAPI_MAX_STRIPES				2
> > > +#define IPU3_UAPI_MAX_BUBBLE_SIZE			10
> > > +
> > > +#define IPU3_UAPI_GRID_START_MASK			(BIT(12) - 1)
> > > +#define IPU3_UAPI_GRID_Y_START_EN			BIT(15)
> > > +
> > > +/* controls generation of meta_data (like FF enable/disable) */
> > > +#define IPU3_UAPI_AWB_RGBS_THR_B_EN			BIT(14)
> > > +#define IPU3_UAPI_AWB_RGBS_THR_B_INCL_SAT		BIT(15)
> > > +
> > > +/**
> > > + * struct ipu3_uapi_grid_config - Grid plane config
> > > + *
> > > + * @width:	Grid horizontal dimensions, in number of grid blocks(cells).
> > > + * @height:	Grid vertical dimensions, in number of grid cells.
> > > + * @block_width_log2:	Log2 of the width of each cell in pixels.
> > > + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
> 
> What are you meaning by [3, 7] here? From some comment you had later,
> I guess you're meaning that only 3 or 7 are the valid values.

This is a notation for a closed interval. Please see:

<URL:https://en.wikipedia.org/wiki/Interval_(mathematics)>

> 
> Yet, you're listing from 2^3 to 2^7, and that's confusing. Perhaps
> you want to say, instead, that the valid values are at the 3..7 range?
> If so, please use something like "values at the [3..7] range".

I'd prefer either 3..7 or [3, 7], but the latter is formal. Whether a range
is closed or (partially) open matters less with integers though.

-- 
Kind regards,

Sakari Ailus
sakari.ailus@linux.intel.com

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Tomasz Figa]

On Tue, Aug 14, 2018 at 5:50 AM Mauro Carvalho Chehab
<mchehab+samsung@kernel.org> wrote:
>
> Em Mon, 13 Aug 2018 15:42:34 +0200
> Hans Verkuil <hverkuil@xs4all.nl> escreveu:
>
> > On 15/06/18 05:29, Yong Zhi wrote:
> > > These meta formats are used on Intel IPU3 ImgU video queues
> > > to carry 3A statistics and ISP pipeline parameters.
> > >
> > > V4L2_META_FMT_IPU3_3A
> > > V4L2_META_FMT_IPU3_PARAMS
> > >
> > > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > > ---
> > >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> > >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> > >  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
> > >  3 files changed, 2991 insertions(+)
> > >  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > >  create mode 100644 include/uapi/linux/intel-ipu3.h
> > >
> > > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst b/Documentation/media/uapi/v4l/meta-formats.rst
> > > index 0c4e1ec..b887fca 100644
> > > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > > @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata` interface only.
> > >  .. toctree::
> > >      :maxdepth: 1
> > >
> > > +    pixfmt-meta-intel-ipu3
> > >      pixfmt-meta-uvc
> > >      pixfmt-meta-vsp1-hgo
> > >      pixfmt-meta-vsp1-hgt
> > > diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > new file mode 100644
> > > index 0000000..5c050e6
> > > --- /dev/null
> > > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > @@ -0,0 +1,174 @@
> > > +.. -*- coding: utf-8; mode: rst -*-
> > > +
> > > +.. _intel-ipu3:
> > > +
> > > +******************************************************************
> > > +V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A ('ip3s')
> > > +******************************************************************
> > > +
> > > +.. c:type:: ipu3_uapi_stats_3a
> > > +
> > > +3A statistics
> > > +=============
> > > +
> > > +For IPU3 ImgU, the 3A statistics accelerators collect different statistics over
> > > +an input bayer frame. Those statistics, defined in data struct
> > > +:c:type:`ipu3_uapi_stats_3a`, are meta output obtained from "ipu3-imgu 3a stat"
> > > +video node, which are then passed to user space for statistics analysis
> > > +using :c:type:`v4l2_meta_format` interface.
> > > +
> > > +The statistics collected are AWB (Auto-white balance) RGBS cells, AWB filter
>
> Just like you did with AWB, AF and AE, please place the full name in parenthesis
> for RGBS and AWB.
>
> > > +response, AF (Auto-focus) filter response, and AE (Auto-exposure) histogram.
> > > +
> > > +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for all above.
> > > +
> > > +
> > > +.. code-block:: c
> > > +
> > > +
> > > +     struct ipu3_uapi_stats_3a {
> > > +   IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> >
> > IPU3_ALIGN? What's that?
> >
> > OK, after reading the header I see what it does, but I think you should
> > drop it in the documentation since it doesn't help the reader.
>
> Yeah, that IPU3_ALIGN is confusing.
>
> Yet, instead of just dropping, I would replace it by a comment
> to explain that the struct is 32-bytes aligned.
>
> On a separate (but related) comment, you're declaring it as:
>
>         #define IPU3_ALIGN      __attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
>
> This is a gcc-specific dialect. Better to use, instead, __aligned(x)
> which is defined as:
>
> #define __aligned(x)            __attribute__((aligned(x)))
>

Note that this is an uapi/ header. Is the __aligned() macro okay to
use in uapi headers? I couldn't find any header there using it and we
had problems with our user space compiling with it.

By the way, I wonder if this is the right approach for controlling the
layout of ABI structs. I don't see many headers using any alignment in
uapi/ in general. Perhaps explicit padding bytes would be more
appropriate? They are also less tricky when one structure needs to be
embedded inside two or more different structures with different
alignments, which can't be done easily if you specify __aligned() on
the child struct.

Best regards,
Tomasz

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Sakari Ailus]

Hi Tomasz,

On Tue, Aug 28, 2018 at 05:56:37PM +0900, Tomasz Figa wrote:
> On Tue, Aug 14, 2018 at 5:50 AM Mauro Carvalho Chehab
> <mchehab+samsung@kernel.org> wrote:
> >
> > Em Mon, 13 Aug 2018 15:42:34 +0200
> > Hans Verkuil <hverkuil@xs4all.nl> escreveu:
> >
> > > On 15/06/18 05:29, Yong Zhi wrote:
> > > > These meta formats are used on Intel IPU3 ImgU video queues
> > > > to carry 3A statistics and ISP pipeline parameters.
> > > >
> > > > V4L2_META_FMT_IPU3_3A
> > > > V4L2_META_FMT_IPU3_PARAMS
> > > >
> > > > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > > > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > > > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > > > ---
> > > >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> > > >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> > > >  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
> > > >  3 files changed, 2991 insertions(+)
> > > >  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > >  create mode 100644 include/uapi/linux/intel-ipu3.h
> > > >
> > > > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > index 0c4e1ec..b887fca 100644
> > > > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > > > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata` interface only.
> > > >  .. toctree::
> > > >      :maxdepth: 1
> > > >
> > > > +    pixfmt-meta-intel-ipu3
> > > >      pixfmt-meta-uvc
> > > >      pixfmt-meta-vsp1-hgo
> > > >      pixfmt-meta-vsp1-hgt
> > > > diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > new file mode 100644
> > > > index 0000000..5c050e6
> > > > --- /dev/null
> > > > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > @@ -0,0 +1,174 @@
> > > > +.. -*- coding: utf-8; mode: rst -*-
> > > > +
> > > > +.. _intel-ipu3:
> > > > +
> > > > +******************************************************************
> > > > +V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A ('ip3s')
> > > > +******************************************************************
> > > > +
> > > > +.. c:type:: ipu3_uapi_stats_3a
> > > > +
> > > > +3A statistics
> > > > +=============
> > > > +
> > > > +For IPU3 ImgU, the 3A statistics accelerators collect different statistics over
> > > > +an input bayer frame. Those statistics, defined in data struct
> > > > +:c:type:`ipu3_uapi_stats_3a`, are meta output obtained from "ipu3-imgu 3a stat"
> > > > +video node, which are then passed to user space for statistics analysis
> > > > +using :c:type:`v4l2_meta_format` interface.
> > > > +
> > > > +The statistics collected are AWB (Auto-white balance) RGBS cells, AWB filter
> >
> > Just like you did with AWB, AF and AE, please place the full name in parenthesis
> > for RGBS and AWB.
> >
> > > > +response, AF (Auto-focus) filter response, and AE (Auto-exposure) histogram.
> > > > +
> > > > +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for all above.
> > > > +
> > > > +
> > > > +.. code-block:: c
> > > > +
> > > > +
> > > > +     struct ipu3_uapi_stats_3a {
> > > > +   IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> > >
> > > IPU3_ALIGN? What's that?
> > >
> > > OK, after reading the header I see what it does, but I think you should
> > > drop it in the documentation since it doesn't help the reader.
> >
> > Yeah, that IPU3_ALIGN is confusing.
> >
> > Yet, instead of just dropping, I would replace it by a comment
> > to explain that the struct is 32-bytes aligned.
> >
> > On a separate (but related) comment, you're declaring it as:
> >
> >         #define IPU3_ALIGN      __attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
> >
> > This is a gcc-specific dialect. Better to use, instead, __aligned(x)
> > which is defined as:
> >
> > #define __aligned(x)            __attribute__((aligned(x)))
> >
> 
> Note that this is an uapi/ header. Is the __aligned() macro okay to
> use in uapi headers? I couldn't find any header there using it and we
> had problems with our user space compiling with it.
> 
> By the way, I wonder if this is the right approach for controlling the
> layout of ABI structs. I don't see many headers using any alignment in
> uapi/ in general. Perhaps explicit padding bytes would be more
> appropriate? They are also less tricky when one structure needs to be
> embedded inside two or more different structures with different
> alignments, which can't be done easily if you specify __aligned() on
> the child struct.

One of the reasons there are not so many are probably what you just
elaborated above. That said, there are a few points to note here:

- the alignment is generally the same here as it's due to DMA word size
  AFAIK,

- the device can be only found in an Intel SoC which limits the
  architectures where the driver can actually be used to x86, 64- or
  32-bit.

Together these should in theory make if fairly safe. Padding in principle
would be more explicit way to force struct memory layout without relying so
much on the compiler doing the right thing but it'll lead to a *lot* of
reserved fields, which I think is likely one of the reasons why it didn't
catch up back then --- I've suggested it earlier.

FWIW, the rest of the uAPI headers appear to be using
__attribute__((aligned(x))).

-- 
Regards,

Sakari Ailus
sakari.ailus@linux.intel.com

RE: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mani, Rajmohan]

Hi Sakari, Mauro,

> -----Original Message-----
> From: Sakari Ailus [mailto:sakari.ailus@linux.intel.com]
> Sent: Tuesday, August 28, 2018 2:16 AM
> To: Tomasz Figa <tfiga@chromium.org>
> Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>; Hans Verkuil
> <hverkuil@xs4all.nl>; Mani, Rajmohan <rajmohan.mani@intel.com>; Zhi,
> Yong <yong.zhi@intel.com>; Linux Media Mailing List <linux-
> media@vger.kernel.org>; Mauro Carvalho Chehab <mchehab@kernel.org>;
> Hans Verkuil <hans.verkuil@cisco.com>; Laurent Pinchart
> <laurent.pinchart@ideasonboard.com>; Zheng, Jian Xu
> <jian.xu.zheng@intel.com>; Hu, Jerry W <jerry.w.hu@intel.com>; Li, Chao C
> <chao.c.li@intel.com>; Qiu, Tian Shu <tian.shu.qiu@intel.com>
> Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> 
> Hi Tomasz,
> 
> On Tue, Aug 28, 2018 at 05:56:37PM +0900, Tomasz Figa wrote:
> > On Tue, Aug 14, 2018 at 5:50 AM Mauro Carvalho Chehab
> > <mchehab+samsung@kernel.org> wrote:
> > >
> > > Em Mon, 13 Aug 2018 15:42:34 +0200
> > > Hans Verkuil <hverkuil@xs4all.nl> escreveu:
> > >
> > > > On 15/06/18 05:29, Yong Zhi wrote:
> > > > > These meta formats are used on Intel IPU3 ImgU video queues to
> > > > > carry 3A statistics and ISP pipeline parameters.
> > > > >
> > > > > V4L2_META_FMT_IPU3_3A
> > > > > V4L2_META_FMT_IPU3_PARAMS
> > > > >
> > > > > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > > > > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > > > > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > > > > ---
> > > > >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> > > > >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> > > > >  include/uapi/linux/intel-ipu3.h                    | 2816
> ++++++++++++++++++++
> > > > >  3 files changed, 2991 insertions(+)  create mode 100644
> > > > > Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > >  create mode 100644 include/uapi/linux/intel-ipu3.h
> > > > >
> > > > > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > index 0c4e1ec..b887fca 100644
> > > > > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata`
> interface only.
> > > > >  .. toctree::
> > > > >      :maxdepth: 1
> > > > >
> > > > > +    pixfmt-meta-intel-ipu3
> > > > >      pixfmt-meta-uvc
> > > > >      pixfmt-meta-vsp1-hgo
> > > > >      pixfmt-meta-vsp1-hgt
> > > > > diff --git
> > > > > a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > new file mode 100644
> > > > > index 0000000..5c050e6
> > > > > --- /dev/null
> > > > > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > @@ -0,0 +1,174 @@
> > > > > +.. -*- coding: utf-8; mode: rst -*-
> > > > > +
> > > > > +.. _intel-ipu3:
> > > > > +
> > > > >
> +***************************************************************
> > > > > +*** V4L2_META_FMT_IPU3_PARAMS ('ip3p'),
> V4L2_META_FMT_IPU3_3A
> > > > > +('ip3s')
> > > > >
> +***************************************************************
> > > > > +***
> > > > > +
> > > > > +.. c:type:: ipu3_uapi_stats_3a
> > > > > +
> > > > > +3A statistics
> > > > > +=============
> > > > > +
> > > > > +For IPU3 ImgU, the 3A statistics accelerators collect different
> > > > > +statistics over an input bayer frame. Those statistics, defined
> > > > > +in data struct :c:type:`ipu3_uapi_stats_3a`, are meta output obtained
> from "ipu3-imgu 3a stat"
> > > > > +video node, which are then passed to user space for statistics
> > > > > +analysis using :c:type:`v4l2_meta_format` interface.
> > > > > +
> > > > > +The statistics collected are AWB (Auto-white balance) RGBS
> > > > > +cells, AWB filter
> > >
> > > Just like you did with AWB, AF and AE, please place the full name in
> > > parenthesis for RGBS and AWB.
> > >
> > > > > +response, AF (Auto-focus) filter response, and AE (Auto-exposure)
> histogram.
> > > > > +
> > > > > +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for
> all above.
> > > > > +
> > > > > +
> > > > > +.. code-block:: c
> > > > > +
> > > > > +
> > > > > +     struct ipu3_uapi_stats_3a {
> > > > > +   IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> > > >
> > > > IPU3_ALIGN? What's that?
> > > >
> > > > OK, after reading the header I see what it does, but I think you
> > > > should drop it in the documentation since it doesn't help the reader.
> > >
> > > Yeah, that IPU3_ALIGN is confusing.
> > >
> > > Yet, instead of just dropping, I would replace it by a comment to
> > > explain that the struct is 32-bytes aligned.
> > >
> > > On a separate (but related) comment, you're declaring it as:
> > >
> > >         #define IPU3_ALIGN
> __attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
> > >
> > > This is a gcc-specific dialect. Better to use, instead, __aligned(x)
> > > which is defined as:
> > >
> > > #define __aligned(x)            __attribute__((aligned(x)))
> > >
> >
> > Note that this is an uapi/ header. Is the __aligned() macro okay to
> > use in uapi headers? I couldn't find any header there using it and we
> > had problems with our user space compiling with it.
> >
> > By the way, I wonder if this is the right approach for controlling the
> > layout of ABI structs. I don't see many headers using any alignment in
> > uapi/ in general. Perhaps explicit padding bytes would be more
> > appropriate? They are also less tricky when one structure needs to be
> > embedded inside two or more different structures with different
> > alignments, which can't be done easily if you specify __aligned() on
> > the child struct.
> 
> One of the reasons there are not so many are probably what you just
> elaborated above. That said, there are a few points to note here:
> 
> - the alignment is generally the same here as it's due to DMA word size
>   AFAIK,
> 
> - the device can be only found in an Intel SoC which limits the
>   architectures where the driver can actually be used to x86, 64- or
>   32-bit.
> 
> Together these should in theory make if fairly safe. Padding in principle would
> be more explicit way to force struct memory layout without relying so much on
> the compiler doing the right thing but it'll lead to a *lot* of reserved fields,
> which I think is likely one of the reasons why it didn't catch up back then --- I've
> suggested it earlier.
> 
> FWIW, the rest of the uAPI headers appear to be using
> __attribute__((aligned(x))).
> 

There are no compilation errors when using __attribute__((aligned(x))) in
the user space code.

When using __aligned(x) (as Mauro recommended) as Tomasz pointed, these
compilation errors pop up (since __aligned(x) is defined nowhere).

The definition of __aligned(x) is not available under include/uapi/*.
This is available in the kernel header include/linux/compiler_types.h

There are other header files under include/uapi that use this
format (__attribute__((aligned(x))).

Should we stick with __attribute__((aligned(x))) or is there a way out?

Thanks
Raj

RE: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mani, Rajmohan]

Hi Hans,

Thanks for your time and reviews.

> -----Original Message-----
> From: Hans Verkuil [mailto:hverkuil@xs4all.nl]
> Sent: Monday, August 13, 2018 6:43 AM
> To: Zhi, Yong <yong.zhi@intel.com>; sakari.ailus@linux.intel.com; linux-
> media@vger.kernel.org
> Cc: tfiga@chromium.org; mchehab@kernel.org; hans.verkuil@cisco.com;
> laurent.pinchart@ideasonboard.com; Mani, Rajmohan
> <rajmohan.mani@intel.com>; Zheng, Jian Xu <jian.xu.zheng@intel.com>; Hu,
> Jerry W <jerry.w.hu@intel.com>; Li, Chao C <chao.c.li@intel.com>; Qiu, Tian
> Shu <tian.shu.qiu@intel.com>
> Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> 
> On 15/06/18 05:29, Yong Zhi wrote:
> > These meta formats are used on Intel IPU3 ImgU video queues
> > to carry 3A statistics and ISP pipeline parameters.
> >
> > V4L2_META_FMT_IPU3_3A
> > V4L2_META_FMT_IPU3_PARAMS
> >
> > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > ---
> >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> >  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
> >  3 files changed, 2991 insertions(+)
> >  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-
> ipu3.rst
> >  create mode 100644 include/uapi/linux/intel-ipu3.h
> >
> > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst
> b/Documentation/media/uapi/v4l/meta-formats.rst
> > index 0c4e1ec..b887fca 100644
> > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata` interface
> only.
> >  .. toctree::
> >      :maxdepth: 1
> >
> > +    pixfmt-meta-intel-ipu3
> >      pixfmt-meta-uvc
> >      pixfmt-meta-vsp1-hgo
> >      pixfmt-meta-vsp1-hgt
> > diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > new file mode 100644
> > index 0000000..5c050e6
> > --- /dev/null
> > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > @@ -0,0 +1,174 @@
> > +.. -*- coding: utf-8; mode: rst -*-
> > +
> > +.. _intel-ipu3:
> > +
> >
> +***************************************************************
> ***
> > +V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A
> ('ip3s')
> >
> +***************************************************************
> ***
> > +
> > +.. c:type:: ipu3_uapi_stats_3a
> > +
> > +3A statistics
> > +=============
> > +
> > +For IPU3 ImgU, the 3A statistics accelerators collect different statistics over
> > +an input bayer frame. Those statistics, defined in data struct
> > +:c:type:`ipu3_uapi_stats_3a`, are meta output obtained from "ipu3-imgu 3a
> stat"
> > +video node, which are then passed to user space for statistics analysis
> > +using :c:type:`v4l2_meta_format` interface.
> > +
> > +The statistics collected are AWB (Auto-white balance) RGBS cells, AWB filter
> > +response, AF (Auto-focus) filter response, and AE (Auto-exposure)
> histogram.
> > +
> > +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for all
> above.
> > +
> > +
> > +.. code-block:: c
> > +
> > +
> > +     struct ipu3_uapi_stats_3a {
> > +	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> 
> IPU3_ALIGN? What's that?
> 
> OK, after reading the header I see what it does, but I think you should
> drop it in the documentation since it doesn't help the reader.
> 

Ack

[snip]

> > +XNR3			 eXtreme Noise Reduction V3 is the third
> revision of
> > +			 noise reduction algorithm used to improve image
> > +			 quality. This removes the low frequency noise in the
> > +			 captured image. Two related structs are  being
> defined,
> > +			 :c:type:`ipu3_uapi_isp_xnr3_params` for ISP data
> memory
> > +			 and :c:type:`ipu3_uapi_isp_xnr3_vmem_params` for
> vector
> > +			 memory.
> > +TNR			 Temporal Noise Reduction block compares successive
> > +			 frames in time to remove anamolies / noise in pixel
> 
> anamolies -> anomalies
> 

Ack

> > +			 values. :c:type:`ipu3_uapi_isp_tnr3_vmem_params`
> and
> > +			 :c:type:`ipu3_uapi_isp_tnr3_params` are defined for
> ISP
> > +			 vector and data memory respectively.
> 
> Nice overview of all the blocks!
> 

Thanks.

> > +========================
> =======================================================> +
> > +A few stages of the pipe will be executed by firmware running on the ISP
> 
> pipe -> pipeline
> 

Ack

[snip]

> > +
> > +#define IPU3_UAPI_ISP_WORD_BYTES			32
> > +#define IMGU_ABI_PAD	__aligned(IPU3_UAPI_ISP_WORD_BYTES)
> > +#define IPU3_ALIGN
> 	__attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
> 
> That's weird. Isn't __aligned identical to __attribute__((aligned( ?
> If so, then these last two defines are also identical.
> 

Ack

> Why is it aligned to a 32 bytes? Is it a hardware requirement?
> 

IPU3 DMA operations require the addresses to be aligned on
32 byte boundaries.

> > +
> > +/******************* ipu3_uapi_stats_3a *******************/
> > +
> > +#define IPU3_UAPI_MAX_STRIPES				2
> > +#define IPU3_UAPI_MAX_BUBBLE_SIZE			10

[snip]

> > +struct ipu3_uapi_ae_grid_config {
> > +	__u8 width;
> > +	__u8 height;
> > +	__u8 block_width_log2:4;
> > +	__u8 block_height_log2:4;
> > +	__u8 __reserved0:5;
> 
> Why add a reserved bitfield? What is its purpose?
> 

Currently this (5 bits) bit field does not have any purpose
and hence it's marked as a reserved field.

> > +	__u8 ae_en:1;
> > +	__u8 rst_hist_array:1;
> > +	__u8 done_rst_hist_array:1;
> > +	__u16 x_start;
> > +	__u16 y_start;
> > +	__u16 x_end;
> > +	__u16 y_end;
> > +} __packed;
> > +

[snip]

> > +struct ipu3_uapi_af_meta_data {
> > +	__u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN;
> 
> Here IPU3_ALIGN is put at the end...
> 
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_af_raw_buffer - AF raw buffer
> > + *
> > + * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus meta
> data.
> > + */
> > +struct ipu3_uapi_af_raw_buffer {
> > +	IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data;
> 
> ... and here at the start. Is that due to the difference between an array and a
> struct?
> 

No.

When preparing uAPI kernelDoc using "make htmldocs",
the kernel-doc encounters two type of error/warnings
caused by IPU3_ALIGN.

case 1:
struct IPU3_ALIGN ipu3_uapi_dummy {
	...
} __packed;

"error: Cannot parse struct or union!"

case 2:
struct ipu3_uapi_dummy {
	struct ipu3_uapi_x x IPU3_ALIGN;
} __packed;

"warning: Function parameter or member 'IPU3_ALIGN' not
described in 'ipu3_uapi_dummy'"

Positioned the attribute syntax without altering the
mem layout of the structs, while also making "make htmldocs" to
compile fine.

Let us know if it's okay to ignore Sphinx warnings.

> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_af_config_s - AF config
> > + *
> > + * @filter_config: AF uses Y1 and Y2 filters as configured in
> > + *		   &ipu3_uapi_af_filter_config
> > + * @padding: paddings
> > + * @grid_cfg: See &ipu3_uapi_grid_config, default resolution 16x16. Use
> large
> > + *	      grid size for large image and vice versa.
> > + */
> > +struct ipu3_uapi_af_config_s {
> > +	IPU3_ALIGN struct ipu3_uapi_af_filter_config filter_config;
> > +	__u8 padding[4];
> 
> Is the padding still needed with the IPU3_ALIGNs?
> 

Yes.

There were some initial review comments around this to make sure
the size and layout of all these structs remain the same with and without
"__packed" attribute. Hence there is a need to have this "padding"
fields to ensure the same.

> > +	IPU3_ALIGN struct ipu3_uapi_grid_config grid_cfg;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_af_config - AF config wrapper
> > + *
> > + * @config: config for auto focus as defined by &ipu3_uapi_af_config_s
> > + */
> > +struct ipu3_uapi_af_config {
> > +	struct ipu3_uapi_af_config_s config;
> > +} __packed;
> > +
> > +#define IPU3_UAPI_AWB_FR_MAX_SETS			24
> > +#define IPU3_UAPI_AWB_FR_MD_ITEM_SIZE			8
> > +#define IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE			0x100
> > +#define IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES \
> > +	(IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \
> > +	 IPU3_UAPI_AWB_FR_MD_ITEM_SIZE)
> > +#define IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE \
> > +	(IPU3_UAPI_AWB_FR_MAX_SETS * \
> > +	(IPU3_UAPI_AWB_FR_BAYER_TBL_SIZE + \
> > +	 IPU3_UAPI_AWB_FR_SPARE_FOR_BUBBLES) *
> IPU3_UAPI_MAX_STRIPES)
> 
> Add newline
> 

Ack

[snip]

> > +/**
> > + * struct ipu3_uapi_4a_config - 4A config
> > + *
> > + * @awb_config: &ipu3_uapi_awb_config_s, default resolution 16x16
> > + * @ae_grd_config: auto exposure statistics &ipu3_uapi_ae_grid_config
> > + * @padding: paddings
> > + * @af_config: auto focus config &ipu3_uapi_af_config_s
> > + * @awb_fr_config: &ipu3_uapi_awb_fr_config_s, default resolution 16x16
> > + */
> > +struct ipu3_uapi_4a_config {
> > +	IPU3_ALIGN struct ipu3_uapi_awb_config_s awb_config;
> > +	struct ipu3_uapi_ae_grid_config ae_grd_config;
> > +	__u8 padding[20];
> 
> Can 'padding' be replaced by IPU3_ALIGN?
> 

No.
This is required to maintain the struct size the same with and without
__packed attribute.

> > +	struct ipu3_uapi_af_config_s af_config;
> > +	struct ipu3_uapi_awb_fr_config_s awb_fr_config;
> > +} __packed;
> > +
> > +/**
> > + * struct ipu3_uapi_bubble_info - Bubble info for host side debugging
> > + *
> > + * @num_of_stripes: A single frame is divided into several parts called
> stripes
> > + *		    due to limitation on line buffer memory.
> > + *		    The separation between the stripes is vertical. Each such
> > + *		    stripe is processed as a single frame by the ISP pipe.
> > + * @padding: padding bytes.
> > + * @num_sets: number of sets.
> > + * @padding1: padding bytes.
> > + * @size_of_set: set size.
> > + * @padding2: padding bytes.
> > + * @bubble_size: is the amount of padding in the bubble expressed in
> “sets”.
> > + * @padding3: padding bytes.
> > + */
> > +struct ipu3_uapi_bubble_info {
> > +	IPU3_ALIGN __u32 num_of_stripes;
> > +	__u8 padding[28];
> > +	__u32 num_sets;
> > +	__u8 padding1[28];
> > +	__u32 size_of_set;
> > +	__u8 padding2[28];
> > +	__u32 bubble_size;
> > +	__u8 padding3[28];
> 
> Same question here and elsewhere.
> 

Ditto

> > +} __packed;
> > +
> > +/*
> > + * struct ipu3_uapi_stats_3a_bubble_info_per_stripe
> > + */
> > +struct ipu3_uapi_stats_3a_bubble_info_per_stripe {
> > +	struct ipu3_uapi_bubble_info awb[IPU3_UAPI_MAX_STRIPES];
> > +	struct ipu3_uapi_bubble_info af[IPU3_UAPI_MAX_STRIPES];
> > +	struct ipu3_uapi_bubble_info awb_fr[IPU3_UAPI_MAX_STRIPES];
> > +} __packed;
> > +

[snip]

> > +/**
> > + * struct ipu3_uapi_anr_transform_config - Advanced noise reduction
> transform
> > + *
> > + * @enable: advanced noise reduction enabled.
> > + * @adaptive_treshhold_en: On IPU3, adaptive threshold is always
> enabled.
> > + * @__reserved1: reserved
> > + * @__reserved2: reserved
> > + * @alpha: using follow defaults:
> 
> follow -> following
> 

Ack

[snip]
> > + * struct ipu3_uapi_params as defined below contains a lot of parameters
> and
> > + * ipu3_uapi_flags selects which parameters to apply.
> > + */
> > +struct ipu3_uapi_params {
> > +	/* Flags which of the settings below are to be applied */
> > +	IPU3_ALIGN struct ipu3_uapi_flags use;
> > +
> > +	/* Accelerator cluster parameters */
> > +	struct ipu3_uapi_acc_param acc_param;
> > +
> > +	/* ISP vector address space parameters */
> > +	struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
> > +	struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
> > +	struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
> > +
> > +	/* ISP data memory (DMEM) parameters */
> > +	struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
> > +	struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
> > +
> > +	/* Optical black level compensation */
> > +	struct ipu3_uapi_obgrid_param obgrid_param;
> > +} __packed;
> > +
> > +#endif
> >
> 
> So the level of documentation looks good to me.

Glad to know.

> The use of IPU3_ALIGN,
> padding and reserved fields
> seems a bit of a mix to me, it's not always clear why a certain approach is
> taken.
> 

IPU3_ALIGN is used to enforce 32 byte alignment for data structures used
by IPU3 DMA.

padding fields are used to ensure the size of the struct remains the same
with and without __packed attribute.

reserved fields are unused fields of either the data that is output by the IPU3
or the parameters that are sent to the IPU3.

> Did you check if the layout of all these structs is the same between 32 and 64
> bit code?
> I would recommend that you automate this (e.g. abi-dumper might be useful
> for this).
> I do need to have confirmation that they are indeed identical.
> 

Yes.
abi-dumper output of the ipu3-imgu.ko with and without CONFIG_64BIT
shows the same layout and offset for the structure members.

> Finally I think we need a high-level description of how to use this:
> 
> I gather that with struct ipu3_uapi_flags you can indicate which blocks need to
> be updated,
> and that for those blocks that do not need updating the corresponding structs
> are ignored.
> If so, then that should be documented in pixfmt-meta-intel-ipu3.rst.
> 

Ack

> And what about the initial values? E.g. after a reboot, do all the blocks have
> sane default
> values? Or do you need to supply those yourself? And if it is the latter, then we
> need
> some open source example code that programs it with sane values. Users can
> take that as a
> starting point and modify it.
> 
> If userspace needs to provide sane initial values, then it would be best if code
> is added to v4l2-utils under contrib. Perhaps under a dual GPL/BSD license?
> 

After a reboot, when streaming is started, ImgU driver sets sane default parameter
values for all the blocks.
This is done by the driver calling ipu3_css_set_parameters() with set_params as
NULL pointer, which leverages the default values from ipu3_tables.c for various
blocks.

Thanks
Raj

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Sakari Ailus]

Hi Raj, Mauro,

On Fri, Aug 31, 2018 at 10:40:22PM +0000, Mani, Rajmohan wrote:
> Hi Sakari, Mauro,
> 
> > -----Original Message-----
> > From: Sakari Ailus [mailto:sakari.ailus@linux.intel.com]
> > Sent: Tuesday, August 28, 2018 2:16 AM
> > To: Tomasz Figa <tfiga@chromium.org>
> > Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>; Hans Verkuil
> > <hverkuil@xs4all.nl>; Mani, Rajmohan <rajmohan.mani@intel.com>; Zhi,
> > Yong <yong.zhi@intel.com>; Linux Media Mailing List <linux-
> > media@vger.kernel.org>; Mauro Carvalho Chehab <mchehab@kernel.org>;
> > Hans Verkuil <hans.verkuil@cisco.com>; Laurent Pinchart
> > <laurent.pinchart@ideasonboard.com>; Zheng, Jian Xu
> > <jian.xu.zheng@intel.com>; Hu, Jerry W <jerry.w.hu@intel.com>; Li, Chao C
> > <chao.c.li@intel.com>; Qiu, Tian Shu <tian.shu.qiu@intel.com>
> > Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> > 
> > Hi Tomasz,
> > 
> > On Tue, Aug 28, 2018 at 05:56:37PM +0900, Tomasz Figa wrote:
> > > On Tue, Aug 14, 2018 at 5:50 AM Mauro Carvalho Chehab
> > > <mchehab+samsung@kernel.org> wrote:
> > > >
> > > > Em Mon, 13 Aug 2018 15:42:34 +0200
> > > > Hans Verkuil <hverkuil@xs4all.nl> escreveu:
> > > >
> > > > > On 15/06/18 05:29, Yong Zhi wrote:
> > > > > > These meta formats are used on Intel IPU3 ImgU video queues to
> > > > > > carry 3A statistics and ISP pipeline parameters.
> > > > > >
> > > > > > V4L2_META_FMT_IPU3_3A
> > > > > > V4L2_META_FMT_IPU3_PARAMS
> > > > > >
> > > > > > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > > > > > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > > > > > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > > > > > ---
> > > > > >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> > > > > >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> > > > > >  include/uapi/linux/intel-ipu3.h                    | 2816
> > ++++++++++++++++++++
> > > > > >  3 files changed, 2991 insertions(+)  create mode 100644
> > > > > > Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > >  create mode 100644 include/uapi/linux/intel-ipu3.h
> > > > > >
> > > > > > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > index 0c4e1ec..b887fca 100644
> > > > > > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata`
> > interface only.
> > > > > >  .. toctree::
> > > > > >      :maxdepth: 1
> > > > > >
> > > > > > +    pixfmt-meta-intel-ipu3
> > > > > >      pixfmt-meta-uvc
> > > > > >      pixfmt-meta-vsp1-hgo
> > > > > >      pixfmt-meta-vsp1-hgt
> > > > > > diff --git
> > > > > > a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > > b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > > new file mode 100644
> > > > > > index 0000000..5c050e6
> > > > > > --- /dev/null
> > > > > > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > > @@ -0,0 +1,174 @@
> > > > > > +.. -*- coding: utf-8; mode: rst -*-
> > > > > > +
> > > > > > +.. _intel-ipu3:
> > > > > > +
> > > > > >
> > +***************************************************************
> > > > > > +*** V4L2_META_FMT_IPU3_PARAMS ('ip3p'),
> > V4L2_META_FMT_IPU3_3A
> > > > > > +('ip3s')
> > > > > >
> > +***************************************************************
> > > > > > +***
> > > > > > +
> > > > > > +.. c:type:: ipu3_uapi_stats_3a
> > > > > > +
> > > > > > +3A statistics
> > > > > > +=============
> > > > > > +
> > > > > > +For IPU3 ImgU, the 3A statistics accelerators collect different
> > > > > > +statistics over an input bayer frame. Those statistics, defined
> > > > > > +in data struct :c:type:`ipu3_uapi_stats_3a`, are meta output obtained
> > from "ipu3-imgu 3a stat"
> > > > > > +video node, which are then passed to user space for statistics
> > > > > > +analysis using :c:type:`v4l2_meta_format` interface.
> > > > > > +
> > > > > > +The statistics collected are AWB (Auto-white balance) RGBS
> > > > > > +cells, AWB filter
> > > >
> > > > Just like you did with AWB, AF and AE, please place the full name in
> > > > parenthesis for RGBS and AWB.
> > > >
> > > > > > +response, AF (Auto-focus) filter response, and AE (Auto-exposure)
> > histogram.
> > > > > > +
> > > > > > +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for
> > all above.
> > > > > > +
> > > > > > +
> > > > > > +.. code-block:: c
> > > > > > +
> > > > > > +
> > > > > > +     struct ipu3_uapi_stats_3a {
> > > > > > +   IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> > > > >
> > > > > IPU3_ALIGN? What's that?
> > > > >
> > > > > OK, after reading the header I see what it does, but I think you
> > > > > should drop it in the documentation since it doesn't help the reader.
> > > >
> > > > Yeah, that IPU3_ALIGN is confusing.
> > > >
> > > > Yet, instead of just dropping, I would replace it by a comment to
> > > > explain that the struct is 32-bytes aligned.
> > > >
> > > > On a separate (but related) comment, you're declaring it as:
> > > >
> > > >         #define IPU3_ALIGN
> > __attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
> > > >
> > > > This is a gcc-specific dialect. Better to use, instead, __aligned(x)
> > > > which is defined as:
> > > >
> > > > #define __aligned(x)            __attribute__((aligned(x)))
> > > >
> > >
> > > Note that this is an uapi/ header. Is the __aligned() macro okay to
> > > use in uapi headers? I couldn't find any header there using it and we
> > > had problems with our user space compiling with it.
> > >
> > > By the way, I wonder if this is the right approach for controlling the
> > > layout of ABI structs. I don't see many headers using any alignment in
> > > uapi/ in general. Perhaps explicit padding bytes would be more
> > > appropriate? They are also less tricky when one structure needs to be
> > > embedded inside two or more different structures with different
> > > alignments, which can't be done easily if you specify __aligned() on
> > > the child struct.
> > 
> > One of the reasons there are not so many are probably what you just
> > elaborated above. That said, there are a few points to note here:
> > 
> > - the alignment is generally the same here as it's due to DMA word size
> >   AFAIK,
> > 
> > - the device can be only found in an Intel SoC which limits the
> >   architectures where the driver can actually be used to x86, 64- or
> >   32-bit.
> > 
> > Together these should in theory make if fairly safe. Padding in principle would
> > be more explicit way to force struct memory layout without relying so much on
> > the compiler doing the right thing but it'll lead to a *lot* of reserved fields,
> > which I think is likely one of the reasons why it didn't catch up back then --- I've
> > suggested it earlier.
> > 
> > FWIW, the rest of the uAPI headers appear to be using
> > __attribute__((aligned(x))).
> > 
> 
> There are no compilation errors when using __attribute__((aligned(x))) in
> the user space code.
> 
> When using __aligned(x) (as Mauro recommended) as Tomasz pointed, these
> compilation errors pop up (since __aligned(x) is defined nowhere).
> 
> The definition of __aligned(x) is not available under include/uapi/*.
> This is available in the kernel header include/linux/compiler_types.h
> 
> There are other header files under include/uapi that use this
> format (__attribute__((aligned(x))).
> 
> Should we stick with __attribute__((aligned(x))) or is there a way out?

My suggestion is to stick with __attribute__((aligned(x))).

-- 
Kind regards,

Sakari Ailus
sakari.ailus@linux.intel.com

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[sakari.ailus]

Hi Raj,

My apologies for the delayed reply.

On Fri, Aug 31, 2018 at 11:39:54PM +0000, Mani, Rajmohan wrote:
...
> > > +struct ipu3_uapi_af_meta_data {
> > > +	__u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN;
> > 
> > Here IPU3_ALIGN is put at the end...
> > 
> > > +} __packed;
> > > +
> > > +/**
> > > + * struct ipu3_uapi_af_raw_buffer - AF raw buffer
> > > + *
> > > + * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus meta
> > data.
> > > + */
> > > +struct ipu3_uapi_af_raw_buffer {
> > > +	IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data;
> > 
> > ... and here at the start. Is that due to the difference between an array and a
> > struct?
> > 
> 
> No.
> 
> When preparing uAPI kernelDoc using "make htmldocs",
> the kernel-doc encounters two type of error/warnings
> caused by IPU3_ALIGN.
> 
> case 1:
> struct IPU3_ALIGN ipu3_uapi_dummy {
> 	...
> } __packed;
> 
> "error: Cannot parse struct or union!"
> 
> case 2:
> struct ipu3_uapi_dummy {
> 	struct ipu3_uapi_x x IPU3_ALIGN;
> } __packed;
> 
> "warning: Function parameter or member 'IPU3_ALIGN' not
> described in 'ipu3_uapi_dummy'"
> 
> Positioned the attribute syntax without altering the
> mem layout of the structs, while also making "make htmldocs" to
> compile fine.
> 
> Let us know if it's okay to ignore Sphinx warnings.

I looked a bit at different options for handling this in scripts/kernel-doc
but the difficulty in macro substitution comes in determining where to do
the substitution and where not to. That seems unaddressable in the kernel-doc
script; most of the time you want the definitions as-is while this is
likely the only case where something else might be appropriate. Making
IPU3_ALIGN a special case probably wouldn't really fly either.

In this particular case I'd just write open the alignment requirement so
kernel-doc can correctly parse it.

-- 
Kind regards,

Sakari Ailus
sakari.ailus@linux.intel.com

RE: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mani, Rajmohan]

Hi Sakari,

> -----Original Message-----
> From: Sakari Ailus [mailto:sakari.ailus@linux.intel.com]
> Sent: Thursday, September 13, 2018 12:37 AM
> To: Mani, Rajmohan <rajmohan.mani@intel.com>
> Cc: Tomasz Figa <tfiga@chromium.org>; Mauro Carvalho Chehab
> <mchehab+samsung@kernel.org>; Hans Verkuil <hverkuil@xs4all.nl>; Zhi,
> Yong <yong.zhi@intel.com>; Linux Media Mailing List <linux-
> media@vger.kernel.org>; Mauro Carvalho Chehab <mchehab@kernel.org>;
> Hans Verkuil <hans.verkuil@cisco.com>; Laurent Pinchart
> <laurent.pinchart@ideasonboard.com>; Zheng, Jian Xu
> <jian.xu.zheng@intel.com>; Hu, Jerry W <jerry.w.hu@intel.com>; Li, Chao C
> <chao.c.li@intel.com>; Qiu, Tian Shu <tian.shu.qiu@intel.com>
> Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> 
> Hi Raj, Mauro,
> 
> On Fri, Aug 31, 2018 at 10:40:22PM +0000, Mani, Rajmohan wrote:
> > Hi Sakari, Mauro,
> >
> > > -----Original Message-----
> > > From: Sakari Ailus [mailto:sakari.ailus@linux.intel.com]
> > > Sent: Tuesday, August 28, 2018 2:16 AM
> > > To: Tomasz Figa <tfiga@chromium.org>
> > > Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>; Hans
> Verkuil
> > > <hverkuil@xs4all.nl>; Mani, Rajmohan <rajmohan.mani@intel.com>; Zhi,
> > > Yong <yong.zhi@intel.com>; Linux Media Mailing List <linux-
> > > media@vger.kernel.org>; Mauro Carvalho Chehab
> <mchehab@kernel.org>;
> > > Hans Verkuil <hans.verkuil@cisco.com>; Laurent Pinchart
> > > <laurent.pinchart@ideasonboard.com>; Zheng, Jian Xu
> > > <jian.xu.zheng@intel.com>; Hu, Jerry W <jerry.w.hu@intel.com>; Li,
> > > Chao C <chao.c.li@intel.com>; Qiu, Tian Shu <tian.shu.qiu@intel.com>
> > > Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> > >
> > > Hi Tomasz,
> > >
> > > On Tue, Aug 28, 2018 at 05:56:37PM +0900, Tomasz Figa wrote:
> > > > On Tue, Aug 14, 2018 at 5:50 AM Mauro Carvalho Chehab
> > > > <mchehab+samsung@kernel.org> wrote:
> > > > >
> > > > > Em Mon, 13 Aug 2018 15:42:34 +0200 Hans Verkuil
> > > > > <hverkuil@xs4all.nl> escreveu:
> > > > >
> > > > > > On 15/06/18 05:29, Yong Zhi wrote:
> > > > > > > These meta formats are used on Intel IPU3 ImgU video queues
> > > > > > > to carry 3A statistics and ISP pipeline parameters.
> > > > > > >
> > > > > > > V4L2_META_FMT_IPU3_3A
> > > > > > > V4L2_META_FMT_IPU3_PARAMS
> > > > > > >
> > > > > > > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > > > > > > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > > > > > > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > > > > > > ---
> > > > > > >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> > > > > > >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> > > > > > >  include/uapi/linux/intel-ipu3.h                    | 2816
> > > ++++++++++++++++++++
> > > > > > >  3 files changed, 2991 insertions(+)  create mode 100644
> > > > > > > Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > > >  create mode 100644 include/uapi/linux/intel-ipu3.h
> > > > > > >
> > > > > > > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > > b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > > index 0c4e1ec..b887fca 100644
> > > > > > > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > > > > > > @@ -12,6 +12,7 @@ These formats are used for the
> > > > > > > :ref:`metadata`
> > > interface only.
> > > > > > >  .. toctree::
> > > > > > >      :maxdepth: 1
> > > > > > >
> > > > > > > +    pixfmt-meta-intel-ipu3
> > > > > > >      pixfmt-meta-uvc
> > > > > > >      pixfmt-meta-vsp1-hgo
> > > > > > >      pixfmt-meta-vsp1-hgt
> > > > > > > diff --git
> > > > > > > a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > > > b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > > > > > new file mode 100644
> > > > > > > index 0000000..5c050e6
> > > > > > > --- /dev/null
> > > > > > > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rs
> > > > > > > +++ t
> > > > > > > @@ -0,0 +1,174 @@
> > > > > > > +.. -*- coding: utf-8; mode: rst -*-
> > > > > > > +
> > > > > > > +.. _intel-ipu3:
> > > > > > > +
> > > > > > >
> > >
> +***************************************************************
> > > > > > > +*** V4L2_META_FMT_IPU3_PARAMS ('ip3p'),
> > > V4L2_META_FMT_IPU3_3A
> > > > > > > +('ip3s')
> > > > > > >
> > >
> +***************************************************************
> > > > > > > +***
> > > > > > > +
> > > > > > > +.. c:type:: ipu3_uapi_stats_3a
> > > > > > > +
> > > > > > > +3A statistics
> > > > > > > +=============
> > > > > > > +
> > > > > > > +For IPU3 ImgU, the 3A statistics accelerators collect
> > > > > > > +different statistics over an input bayer frame. Those
> > > > > > > +statistics, defined in data struct
> > > > > > > +:c:type:`ipu3_uapi_stats_3a`, are meta output obtained
> > > from "ipu3-imgu 3a stat"
> > > > > > > +video node, which are then passed to user space for
> > > > > > > +statistics analysis using :c:type:`v4l2_meta_format` interface.
> > > > > > > +
> > > > > > > +The statistics collected are AWB (Auto-white balance) RGBS
> > > > > > > +cells, AWB filter
> > > > >
> > > > > Just like you did with AWB, AF and AE, please place the full
> > > > > name in parenthesis for RGBS and AWB.
> > > > >
> > > > > > > +response, AF (Auto-focus) filter response, and AE
> > > > > > > +(Auto-exposure)
> > > histogram.
> > > > > > > +
> > > > > > > +struct :c:type:`ipu3_uapi_4a_config` saves configurable
> > > > > > > +parameters for
> > > all above.
> > > > > > > +
> > > > > > > +
> > > > > > > +.. code-block:: c
> > > > > > > +
> > > > > > > +
> > > > > > > +     struct ipu3_uapi_stats_3a {
> > > > > > > +   IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer
> > > > > > > + awb_raw_buffer;
> > > > > >
> > > > > > IPU3_ALIGN? What's that?
> > > > > >
> > > > > > OK, after reading the header I see what it does, but I think
> > > > > > you should drop it in the documentation since it doesn't help the
> reader.
> > > > >
> > > > > Yeah, that IPU3_ALIGN is confusing.
> > > > >
> > > > > Yet, instead of just dropping, I would replace it by a comment
> > > > > to explain that the struct is 32-bytes aligned.
> > > > >
> > > > > On a separate (but related) comment, you're declaring it as:
> > > > >
> > > > >         #define IPU3_ALIGN
> > > __attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
> > > > >
> > > > > This is a gcc-specific dialect. Better to use, instead,
> > > > > __aligned(x) which is defined as:
> > > > >
> > > > > #define __aligned(x)            __attribute__((aligned(x)))
> > > > >
> > > >
> > > > Note that this is an uapi/ header. Is the __aligned() macro okay
> > > > to use in uapi headers? I couldn't find any header there using it
> > > > and we had problems with our user space compiling with it.
> > > >
> > > > By the way, I wonder if this is the right approach for controlling
> > > > the layout of ABI structs. I don't see many headers using any
> > > > alignment in uapi/ in general. Perhaps explicit padding bytes
> > > > would be more appropriate? They are also less tricky when one
> > > > structure needs to be embedded inside two or more different
> > > > structures with different alignments, which can't be done easily
> > > > if you specify __aligned() on the child struct.
> > >
> > > One of the reasons there are not so many are probably what you just
> > > elaborated above. That said, there are a few points to note here:
> > >
> > > - the alignment is generally the same here as it's due to DMA word size
> > >   AFAIK,
> > >
> > > - the device can be only found in an Intel SoC which limits the
> > >   architectures where the driver can actually be used to x86, 64- or
> > >   32-bit.
> > >
> > > Together these should in theory make if fairly safe. Padding in
> > > principle would be more explicit way to force struct memory layout
> > > without relying so much on the compiler doing the right thing but
> > > it'll lead to a *lot* of reserved fields, which I think is likely
> > > one of the reasons why it didn't catch up back then --- I've suggested it
> earlier.
> > >
> > > FWIW, the rest of the uAPI headers appear to be using
> > > __attribute__((aligned(x))).
> > >
> >
> > There are no compilation errors when using __attribute__((aligned(x)))
> > in the user space code.
> >
> > When using __aligned(x) (as Mauro recommended) as Tomasz pointed,
> > these compilation errors pop up (since __aligned(x) is defined nowhere).
> >
> > The definition of __aligned(x) is not available under include/uapi/*.
> > This is available in the kernel header include/linux/compiler_types.h
> >
> > There are other header files under include/uapi that use this format
> > (__attribute__((aligned(x))).
> >
> > Should we stick with __attribute__((aligned(x))) or is there a way out?
> 
> My suggestion is to stick with __attribute__((aligned(x))).

Ack

> 
> --
> Kind regards,
> 
> Sakari Ailus
> sakari.ailus@linux.intel.com

RE: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mani, Rajmohan]

Hi Sakari,

> -----Original Message-----
> From: sakari.ailus@linux.intel.com [mailto:sakari.ailus@linux.intel.com]
> Sent: Thursday, September 13, 2018 4:38 AM
> To: Mani, Rajmohan <rajmohan.mani@intel.com>
> Cc: Hans Verkuil <hverkuil@xs4all.nl>; Zhi, Yong <yong.zhi@intel.com>; linux-
> media@vger.kernel.org; tfiga@chromium.org; mchehab@kernel.org;
> hans.verkuil@cisco.com; laurent.pinchart@ideasonboard.com; Zheng, Jian Xu
> <jian.xu.zheng@intel.com>; Hu, Jerry W <jerry.w.hu@intel.com>; Li, Chao C
> <chao.c.li@intel.com>; Qiu, Tian Shu <tian.shu.qiu@intel.com>
> Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> 
> Hi Raj,
> 
> My apologies for the delayed reply.
> 
> On Fri, Aug 31, 2018 at 11:39:54PM +0000, Mani, Rajmohan wrote:
> ...
> > > > +struct ipu3_uapi_af_meta_data {
> > > > +	__u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN;
> > >
> > > Here IPU3_ALIGN is put at the end...
> > >
> > > > +} __packed;
> > > > +
> > > > +/**
> > > > + * struct ipu3_uapi_af_raw_buffer - AF raw buffer
> > > > + *
> > > > + * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus
> > > > +meta
> > > data.
> > > > + */
> > > > +struct ipu3_uapi_af_raw_buffer {
> > > > +	IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data;
> > >
> > > ... and here at the start. Is that due to the difference between an
> > > array and a struct?
> > >
> >
> > No.
> >
> > When preparing uAPI kernelDoc using "make htmldocs", the kernel-doc
> > encounters two type of error/warnings caused by IPU3_ALIGN.
> >
> > case 1:
> > struct IPU3_ALIGN ipu3_uapi_dummy {
> > 	...
> > } __packed;
> >
> > "error: Cannot parse struct or union!"
> >
> > case 2:
> > struct ipu3_uapi_dummy {
> > 	struct ipu3_uapi_x x IPU3_ALIGN;
> > } __packed;
> >
> > "warning: Function parameter or member 'IPU3_ALIGN' not described in
> > 'ipu3_uapi_dummy'"
> >
> > Positioned the attribute syntax without altering the mem layout of the
> > structs, while also making "make htmldocs" to compile fine.
> >
> > Let us know if it's okay to ignore Sphinx warnings.
> 
> I looked a bit at different options for handling this in scripts/kernel-doc but the
> difficulty in macro substitution comes in determining where to do the
> substitution and where not to. That seems unaddressable in the kernel-doc
> script; most of the time you want the definitions as-is while this is likely the
> only case where something else might be appropriate. Making IPU3_ALIGN a
> special case probably wouldn't really fly either.
> 
> In this particular case I'd just write open the alignment requirement so kernel-
> doc can correctly parse it.

Ack.

> 
> --
> Kind regards,
> 
> Sakari Ailus
> sakari.ailus@linux.intel.com

RE: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mani, Rajmohan]

Hi Mauro,

Thanks for the reviews.

> Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> 
> Em Mon, 13 Aug 2018 15:42:34 +0200
> Hans Verkuil <hverkuil@xs4all.nl> escreveu:
> 
> > On 15/06/18 05:29, Yong Zhi wrote:
> > > These meta formats are used on Intel IPU3 ImgU video queues
> > > to carry 3A statistics and ISP pipeline parameters.
> > >
> > > V4L2_META_FMT_IPU3_3A
> > > V4L2_META_FMT_IPU3_PARAMS
> > >
> > > Signed-off-by: Yong Zhi <yong.zhi@intel.com>
> > > Signed-off-by: Chao C Li <chao.c.li@intel.com>
> > > Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
> > > ---
> > >  Documentation/media/uapi/v4l/meta-formats.rst      |    1 +
> > >  .../media/uapi/v4l/pixfmt-meta-intel-ipu3.rst      |  174 ++
> > >  include/uapi/linux/intel-ipu3.h                    | 2816 ++++++++++++++++++++
> > >  3 files changed, 2991 insertions(+)
> > >  create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-intel-
> ipu3.rst
> > >  create mode 100644 include/uapi/linux/intel-ipu3.h
> > >
> > > diff --git a/Documentation/media/uapi/v4l/meta-formats.rst
> b/Documentation/media/uapi/v4l/meta-formats.rst
> > > index 0c4e1ec..b887fca 100644
> > > --- a/Documentation/media/uapi/v4l/meta-formats.rst
> > > +++ b/Documentation/media/uapi/v4l/meta-formats.rst
> > > @@ -12,6 +12,7 @@ These formats are used for the :ref:`metadata`
> interface only.
> > >  .. toctree::
> > >      :maxdepth: 1
> > >
> > > +    pixfmt-meta-intel-ipu3
> > >      pixfmt-meta-uvc
> > >      pixfmt-meta-vsp1-hgo
> > >      pixfmt-meta-vsp1-hgt
> > > diff --git a/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > new file mode 100644
> > > index 0000000..5c050e6
> > > --- /dev/null
> > > +++ b/Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst
> > > @@ -0,0 +1,174 @@
> > > +.. -*- coding: utf-8; mode: rst -*-
> > > +
> > > +.. _intel-ipu3:
> > > +
> > >
> +***************************************************************
> ***
> > > +V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A
> ('ip3s')
> > >
> +***************************************************************
> ***
> > > +
> > > +.. c:type:: ipu3_uapi_stats_3a
> > > +
> > > +3A statistics
> > > +=============
> > > +
> > > +For IPU3 ImgU, the 3A statistics accelerators collect different statistics over
> > > +an input bayer frame. Those statistics, defined in data struct
> > > +:c:type:`ipu3_uapi_stats_3a`, are meta output obtained from "ipu3-imgu
> 3a stat"
> > > +video node, which are then passed to user space for statistics analysis
> > > +using :c:type:`v4l2_meta_format` interface.
> > > +
> > > +The statistics collected are AWB (Auto-white balance) RGBS cells, AWB
> filter
> 
> Just like you did with AWB, AF and AE, please place the full name in
> parenthesis
> for RGBS and AWB.
> 

Ack

> > > +response, AF (Auto-focus) filter response, and AE (Auto-exposure)
> histogram.
> > > +
> > > +struct :c:type:`ipu3_uapi_4a_config` saves configurable parameters for all
> above.
> > > +
> > > +
> > > +.. code-block:: c
> > > +
> > > +
> > > +     struct ipu3_uapi_stats_3a {
> > > +	IPU3_ALIGN struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
> >
> > IPU3_ALIGN? What's that?
> >
> > OK, after reading the header I see what it does, but I think you should
> > drop it in the documentation since it doesn't help the reader.
> 
> Yeah, that IPU3_ALIGN is confusing.
> 
> Yet, instead of just dropping, I would replace it by a comment
> to explain that the struct is 32-bytes aligned.
> 

Ack

> On a separate (but related) comment, you're declaring it as:
> 
> 	#define IPU3_ALIGN
> 	__attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
> 
> This is a gcc-specific dialect. Better to use, instead, __aligned(x)
> which is defined as:
> 
> #define __aligned(x)		__attribute__((aligned(x)))
> 

As discussed in the other thread, the following will be used directly,
as applicable for required data structures.

__attribute__((aligned(32)))

[snip]

> > > +
> > > +#define IPU3_UAPI_ISP_WORD_BYTES			32
> > > +#define IMGU_ABI_PAD	__aligned(IPU3_UAPI_ISP_WORD_BYTES)
> > > +#define IPU3_ALIGN
> 	__attribute__((aligned(IPU3_UAPI_ISP_WORD_BYTES)))
> >
> > That's weird. Isn't __aligned identical to __attribute__((aligned( ?
> > If so, then these last two defines are also identical.
> 
> Yes, AFAIKT they're identical and __aligned() is the preferred form.
> 

As discussed in the other thread, the following will be used directly,
as applicable for required data structures.

__attribute__((aligned(x)))

> >
> > Why is it aligned to a 32 bytes? Is it a hardware requirement?
> >
> > > +
> > > +/******************* ipu3_uapi_stats_3a *******************/
> > > +
> > > +#define IPU3_UAPI_MAX_STRIPES				2
> > > +#define IPU3_UAPI_MAX_BUBBLE_SIZE			10
> > > +
> > > +#define IPU3_UAPI_GRID_START_MASK			(BIT(12) - 1)
> > > +#define IPU3_UAPI_GRID_Y_START_EN			BIT(15)
> > > +
> > > +/* controls generation of meta_data (like FF enable/disable) */
> > > +#define IPU3_UAPI_AWB_RGBS_THR_B_EN			BIT(14)
> > > +#define IPU3_UAPI_AWB_RGBS_THR_B_INCL_SAT		BIT(15)
> > > +
> > > +/**
> > > + * struct ipu3_uapi_grid_config - Grid plane config
> > > + *
> > > + * @width:	Grid horizontal dimensions, in number of grid blocks(cells).
> > > + * @height:	Grid vertical dimensions, in number of grid cells.
> > > + * @block_width_log2:	Log2 of the width of each cell in pixels.
> > > + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
> 
> What are you meaning by [3, 7] here?

All integers from 3 through 7, including 3 and 7.

> From some comment you had later,
> I guess you're meaning that only 3 or 7 are the valid values.
> 
> Yet, you're listing from 2^3 to 2^7, and that's confusing. Perhaps
> you want to say, instead, that the valid values are at the 3..7 range?
> If so, please use something like "values at the [3..7] range".
> 

As Sakari pointed / preferred in the other thread, we will use the format
[3, 7] to represent all integers between 3 and 7, including 3 and 7.

> > > + * @block_height_log2:	Log2 of the height of each cell in pixels.
> > > + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
> 
> Same here.
> 

Ack.
[3, 7] format will be used uniformly.

[snip]

> > > + * @width: Grid horizontal dimensions. Value: [16,32], default 16.
> 
> if [16,32] is a range, please use [16..32]. If only 16 or 32 are
> valid values, please say something like:
> 
> 	Value: 16 or 32. Defaults to 16.
> 
> Same to other places.
> 
> > > + * @height: Grid vertical dimensions. Value: [16,24], default 16.
> 
> Same here.
> 

[16, 32] is a range.
(As Sakari pointed [16, 32] is the same as [16..32]. We will use the former
format uniformly).

[snip]

> > > +/**
> > > + * struct ipu3_uapi_af_meta_data - AF meta data
> > > + *
> > > + * @y_table:	Each color component will be convolved separately
> with filter1
> > > + *		and filter2 and the result will be summed out and averaged for
> > > + *		each cell.
> > > + */
> > > +struct ipu3_uapi_af_meta_data {
> > > +	__u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN;
> >
> > Here IPU3_ALIGN is put at the end...
> >
> > > +} __packed;
> > > +
> > > +/**
> > > + * struct ipu3_uapi_af_raw_buffer - AF raw buffer
> > > + *
> > > + * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus
> meta data.
> > > + */
> > > +struct ipu3_uapi_af_raw_buffer {
> > > +	IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data;
> >
> > ... and here at the start. Is that due to the difference between an array and a
> struct?
> 

No.
This was done to work around the Sphinx / kerneldoc generation as 
discussed in the other thread.

> If placing it at the end works (I guess it works for structs), I would
> prefer it always at the end.
> 
> Btw, IMO, I would, instead be doing something like:
> 
> 	#define IPU3_ALIGN	32
> 
> (e. g. some short name - IPU3_UAPI_ISP_WORD_BYTES is too big to my taste :-)
> )
> 
> and replace all occurrences of it by:
> 
> 	IPU3_ALIGN -> __aligned(IPU3_ALIGN)
> 
> That would make it a way easier to read and review.
> 

Ack.

Since Sphinx / kernel doc generation has warnings / errors, we will stick with
the following format.

__attribute__((aligned(32)))

[snip]

> > > + * @ci:	Intensity coefficient for threshold calculation. u3.2, range
> [0..7.75]
> 
> hmm... 7.75??? ci is an _u32 with 5 bits... it can't be a floating point value!
> 
> also, what do you mean by u3.2?
> 

By u3.2, we mean an unsigned integer with 5 bits, with 3 most significant
bits used for the decimal number and the 2 least significant bits used for
the fractional part.

So, 7.75, will be represented as 11111b, with 111b giving 7, 11b resulting
in 0.75 (3 times 0.25), as each unit of fractional part has a value of 0.25.

Will fix the documentation accordingly.

[snip]

> > > + * All above has precision u0.4, range [0..0xF].
> 
> again, what do you mean by u0.4? 

unsigned integer with 0 bits used for representing whole number,
with 4 least significant bits used to represent the fractional part.

> For hexadecimal values (here and
> everywhere)
> please prefer lowecase.
> 

Ack

[snip]

> 
> For coherency along the header, please represent ranges
> the same way. On other places, you used [min..max].
> 

Ack
This will be represented as [min, max] uniformly.

[snip]

> > > + * @lut:	256 tabulated values of the gamma function. LUT[1].. LUT[256]
> > > + *		format u13.0, range (0, 8191).
> 
> Same note about ranges here... Use just one type of convention...
> 

Ack

[snip]

> > > + * @coeff_b3:	Bias 3x1 coefficients, s13,0 range [-8191, 8181], default
> 0.
> 
> and here.
> 

Ack

[snip]

> > > + * @ds_c12:	range 0, 3
> > > + * @ds_c13:	range 0, 3
> 
> and here and similar places below.
> 

Ack

[snip]

> > > +struct ipu3_uapi_anr_stitch_config {
> > > +	__u32 anr_stitch_en;
> > > +	__u8 __reserved[44];
> 
> Better to use __aligned() here and on other similar places where you
> added __reserved fields.
> 

__reserved fields are used in places, for future needs.

__aligned is used for cases where 32 byte alignment is required by IPU3 hw.
 
[snip]

> > > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds;
> > > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_chnr_config chnr;
> > > +	IPU3_ALIGN __u8 __reserved1[516];
> 
> Wow! lots of empty space here! I would, instead, do something like:
> 
> struct ipu3_uapi_yuvp1_chnr_config chnr __aligned(IPU3_ALIGN * 517);
> 

These __reservedX fields were left as such to have backward compatibility
with user space code (at the time of this patch submission).
Will clean this up in the next patch set.

> > > +	IPU3_ALIGN struct ipu3_uapi_yuvp1_yds_config yds2;
> > > +	IPU3_ALIGN struct ipu3_uapi_yuvp2_tcc_static_config tcc;
> > > +	__u8 __reserved2[1152];
> 
> and something similar here.
> 

Ditto

[snip]

> > >
> >
> > So the level of documentation looks good to me.
> 
> Same for me. See above for my comments.
> 

Good to know.

> > The use of IPU3_ALIGN, padding and reserved fields
> > seems a bit of a mix to me, it's not always clear why a certain approach is
> taken.
> >
> > Did you check if the layout of all these structs is the same between 32 and 64
> bit code?
> > I would recommend that you automate this (e.g. abi-dumper might be useful
> for this).
> > I do need to have confirmation that they are indeed identical.
> 
> Yeah, adding a 32 bits compat code here would be really painful. Let's
> avoid it if possible.
> 

This is taken care as we have verified the size and layout of the structs
remain the same across 32 bit and 64 bit builds.

Thanks
Raj

Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[sakari.ailus]

Hi Raj,

On Wed, Oct 03, 2018 at 10:56:19PM +0000, Mani, Rajmohan wrote:
...
> > From some comment you had later,
> > I guess you're meaning that only 3 or 7 are the valid values.
> > 
> > Yet, you're listing from 2^3 to 2^7, and that's confusing. Perhaps
> > you want to say, instead, that the valid values are at the 3..7 range?
> > If so, please use something like "values at the [3..7] range".
> > 
> 
> As Sakari pointed / preferred in the other thread, we will use the format
> [3, 7] to represent all integers between 3 and 7, including 3 and 7.

Feel free to add a reference to this in the format documentation:

<URL:https://en.wikipedia.org/wiki/Interval_(mathematics)>

I guess the right place would be the top parameter format ReST document.

...

> > > > + * All above has precision u0.4, range [0..0xF].
> > 
> > again, what do you mean by u0.4? 
> 
> unsigned integer with 0 bits used for representing whole number,
> with 4 least significant bits used to represent the fractional part.

You could refer to this:

<URL:https://en.wikipedia.org/wiki/Q_(number_format)>

The ux.y notation is more common in the context of software but I couldn't
find any decent document to refer to.

-- 
Regards,

Sakari Ailus
sakari.ailus@linux.intel.com

RE: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

[Mani, Rajmohan]

Hi Sakari,

> -----Original Message-----
> From: sakari.ailus@linux.intel.com [mailto:sakari.ailus@linux.intel.com]
> Sent: Thursday, October 04, 2018 12:09 AM
> To: Mani, Rajmohan <rajmohan.mani@intel.com>
> Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>; Hans Verkuil
> <hverkuil@xs4all.nl>; Zhi, Yong <yong.zhi@intel.com>; linux-
> media@vger.kernel.org; tfiga@chromium.org; mchehab@kernel.org;
> hans.verkuil@cisco.com; laurent.pinchart@ideasonboard.com; Zheng, Jian Xu
> <jian.xu.zheng@intel.com>; Hu, Jerry W <jerry.w.hu@intel.com>; Li, Chao C
> <chao.c.li@intel.com>; Qiu, Tian Shu <tian.shu.qiu@intel.com>
> Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI
> 
> Hi Raj,
> 
> On Wed, Oct 03, 2018 at 10:56:19PM +0000, Mani, Rajmohan wrote:
> ...
> > > From some comment you had later,
> > > I guess you're meaning that only 3 or 7 are the valid values.
> > >
> > > Yet, you're listing from 2^3 to 2^7, and that's confusing. Perhaps
> > > you want to say, instead, that the valid values are at the 3..7 range?
> > > If so, please use something like "values at the [3..7] range".
> > >
> >
> > As Sakari pointed / preferred in the other thread, we will use the
> > format [3, 7] to represent all integers between 3 and 7, including 3 and 7.
> 
> Feel free to add a reference to this in the format documentation:
> 
> <URL:https://en.wikipedia.org/wiki/Interval_(mathematics)>
> 
> I guess the right place would be the top parameter format ReST document.
> 

Ack

> ...
> 
> > > > > + * All above has precision u0.4, range [0..0xF].
> > >
> > > again, what do you mean by u0.4?
> >
> > unsigned integer with 0 bits used for representing whole number, with
> > 4 least significant bits used to represent the fractional part.
> 
> You could refer to this:
> 
> <URL:https://en.wikipedia.org/wiki/Q_(number_format)>
> 
> The ux.y notation is more common in the context of software but I couldn't
> find any decent document to refer to.
> 

Ack.
Will stick with ux.y notation with the relevant documentation (unless there
Is a preference for Q format).

> --
> Regards,
> 
> Sakari Ailus
> sakari.ailus@linux.intel.com