media: uapi: Add stats info and parameters buffer for C3 ISP

Add a header that describes the 3A statistics buffer and the
parameters buffer for C3 ISP

Reviewed-by: Jacopo Mondi <[e-mail]>
Signed-off-by: Keke Li <[e-mail]>
Signed-off-by: Jacopo Mondi <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

MAINTAINERS

···
 L:	[e-mail]
 S:	Maintained
 F:	Documentation/devicetree/bindings/media/amlogic,c3-isp.yaml
+F:	include/uapi/linux/media/amlogic/
 
 AMLOGIC MIPI ADAPTER DRIVER
 M:	Keke Li <[e-mail]>

include/uapi/linux/media/amlogic/c3-isp-config.h

···
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2024 Amlogic, Inc. All rights reserved
+ */
+
+#ifndef _UAPI_C3_ISP_CONFIG_H_
+#define _UAPI_C3_ISP_CONFIG_H_
+
+#include <linux/types.h>
+
+/*
+ * Frames are split into zones of almost equal width and height - a zone is a
+ * rectangular tile of a frame. The metering blocks within the ISP collect
+ * aggregated statistics per zone.
+ */
+#define C3_ISP_AE_MAX_ZONES (17 * 15)
+#define C3_ISP_AF_MAX_ZONES (17 * 15)
+#define C3_ISP_AWB_MAX_ZONES (32 * 24)
+
+/* The maximum number of point on the diagonal of the frame for statistics */
+#define C3_ISP_AE_MAX_PT_NUM 18
+#define C3_ISP_AF_MAX_PT_NUM 18
+#define C3_ISP_AWB_MAX_PT_NUM 33
+
+/**
+ * struct c3_isp_awb_zone_stats - AWB statistics of a zone
+ *
+ * AWB zone stats is aligned with 8 bytes
+ *
+ * @rg: the ratio of R / G in a zone
+ * @bg: the ratio of B / G in a zone
+ * @pixel_sum: the total number of pixels used in a zone
+ */
+struct c3_isp_awb_zone_stats {
+	__u16 rg;
+	__u16 bg;
+	__u32 pixel_sum;
+};
+
+/**
+ * struct c3_isp_awb_stats - Auto white balance statistics information.
+ *
+ * AWB statistical information of all zones.
+ *
+ * @stats: array of auto white balance statistics
+ */
+struct c3_isp_awb_stats {
+	struct c3_isp_awb_zone_stats stats[C3_ISP_AWB_MAX_ZONES];
+} __attribute__((aligned(16)));
+
+/**
+ * struct c3_isp_ae_zone_stats - AE statistics of a zone
+ *
+ * AE zone stats is aligned with 8 bytes.
+ * This is a 5-bin histogram and the total sum is normalized to 0xffff.
+ * So hist2 = 0xffff - (hist0 + hist1 + hist3 + hist4)
+ *
+ * @hist0: the global normalized pixel count for bin 0
+ * @hist1: the global normalized pixel count for bin 1
+ * @hist3: the global normalized pixel count for bin 3
+ * @hist4: the global normalized pixel count for bin 4
+ */
+struct c3_isp_ae_zone_stats {
+	__u16 hist0;
+	__u16 hist1;
+	__u16 hist3;
+	__u16 hist4;
+};
+
+/**
+ * struct c3_isp_ae_stats - Exposure statistics information
+ *
+ * AE statistical information consists of all blocks information and a 1024-bin
+ * histogram.
+ *
+ * @stats: array of auto exposure block statistics
+ * @reserved: undefined buffer space
+ * @hist: a 1024-bin histogram for the entire image
+ */
+struct c3_isp_ae_stats {
+	struct c3_isp_ae_zone_stats stats[C3_ISP_AE_MAX_ZONES];
+	__u32 reserved[2];
+	__u32 hist[1024];
+} __attribute__((aligned(16)));
+
+/**
+ * struct c3_isp_af_zone_stats - AF statistics of a zone
+ *
+ * AF zone stats is aligned with 8 bytes.
+ * The zonal accumulated contrast metrics are stored in floating point format
+ * with 16 bits mantissa and 5 or 6 bits exponent. Apart from contrast metrics
+ * we accumulate squared image and quartic image data over the zone.
+ *
+ * @i2_mat: the mantissa of zonal squared image pixel sum
+ * @i4_mat: the mantissa of zonal quartic image pixel sum
+ * @e4_mat: the mantissa of zonal multi-directional quartic edge sum
+ * @e4_exp: the exponent of zonal multi-directional quartic edge sum
+ * @i2_exp: the exponent of zonal squared image pixel sum
+ * @i4_exp: the exponent of zonal quartic image pixel sum
+ */
+struct c3_isp_af_zone_stats {
+	__u16 i2_mat;
+	__u16 i4_mat;
+	__u16 e4_mat;
+	__u16 e4_exp : 5;
+	__u16 i2_exp : 5;
+	__u16 i4_exp : 6;
+};
+
+/**
+ * struct c3_isp_af_stats - Auto Focus statistics information
+ *
+ * AF statistical information of each zone
+ *
+ * @stats: array of auto focus block statistics
+ * @reserved: undefined buffer space
+ */
+struct c3_isp_af_stats {
+	struct c3_isp_af_zone_stats stats[C3_ISP_AF_MAX_ZONES];
+	__u32 reserved[2];
+} __attribute__((aligned(16)));
+
+/**
+ * struct c3_isp_stats_info - V4L2_META_FMT_C3ISP_STATS
+ *
+ * Contains ISP statistics
+ *
+ * @awb: auto white balance stats
+ * @ae: auto exposure stats
+ * @af: auto focus stats
+ */
+struct c3_isp_stats_info {
+	struct c3_isp_awb_stats awb;
+	struct c3_isp_ae_stats ae;
+	struct c3_isp_af_stats af;
+};
+
+/**
+ * enum c3_isp_params_buffer_version -  C3 ISP parameters block versioning
+ *
+ * @C3_ISP_PARAMS_BUFFER_V0: First version of C3 ISP parameters block
+ */
+enum c3_isp_params_buffer_version {
+	C3_ISP_PARAMS_BUFFER_V0,
+};
+
+/**
+ * enum c3_isp_params_block_type - Enumeration of C3 ISP parameter blocks
+ *
+ * Each block configures a specific processing block of the C3 ISP.
+ * The block type allows the driver to correctly interpret the parameters block
+ * data.
+ *
+ * @C3_ISP_PARAMS_BLOCK_AWB_GAINS: White balance gains
+ * @C3_ISP_PARAMS_BLOCK_AWB_CONFIG: AWB statistic format configuration for all
+ *                                  blocks that control how stats are generated
+ * @C3_ISP_PARAMS_BLOCK_AE_CONFIG: AE statistic format configuration for all
+ *                                 blocks that control how stats are generated
+ * @C3_ISP_PARAMS_BLOCK_AF_CONFIG: AF statistic format configuration for all
+ *                                 blocks that control how stats are generated
+ * @C3_ISP_PARAMS_BLOCK_PST_GAMMA: post gamma parameters
+ * @C3_ISP_PARAMS_BLOCK_CCM: Color correction matrix parameters
+ * @C3_ISP_PARAMS_BLOCK_CSC: Color space conversion parameters
+ * @C3_ISP_PARAMS_BLOCK_BLC: Black level correction parameters
+ * @C3_ISP_PARAMS_BLOCK_SENTINEL: First non-valid block index
+ */
+enum c3_isp_params_block_type {
+	C3_ISP_PARAMS_BLOCK_AWB_GAINS,
+	C3_ISP_PARAMS_BLOCK_AWB_CONFIG,
+	C3_ISP_PARAMS_BLOCK_AE_CONFIG,
+	C3_ISP_PARAMS_BLOCK_AF_CONFIG,
+	C3_ISP_PARAMS_BLOCK_PST_GAMMA,
+	C3_ISP_PARAMS_BLOCK_CCM,
+	C3_ISP_PARAMS_BLOCK_CSC,
+	C3_ISP_PARAMS_BLOCK_BLC,
+	C3_ISP_PARAMS_BLOCK_SENTINEL
+};
+
+#define C3_ISP_PARAMS_BLOCK_FL_DISABLE (1U << 0)
+#define C3_ISP_PARAMS_BLOCK_FL_ENABLE (1U << 1)
+
+/**
+ * struct c3_isp_params_block_header - C3 ISP parameter block header
+ *
+ * This structure represents the common part of all the ISP configuration
+ * blocks. Each parameters block shall embed an instance of this structure type
+ * as its first member, followed by the block-specific configuration data. The
+ * driver inspects this common header to discern the block type and its size and
+ * properly handle the block content by casting it to the correct block-specific
+ * type.
+ *
+ * The @type field is one of the values enumerated by
+ * :c:type:`c3_isp_params_block_type` and specifies how the data should be
+ * interpreted by the driver. The @size field specifies the size of the
+ * parameters block and is used by the driver for validation purposes. The
+ * @flags field is a bitmask of per-block flags C3_ISP_PARAMS_FL*.
+ *
+ * When userspace wants to disable an ISP block the
+ * C3_ISP_PARAMS_BLOCK_FL_DISABLED bit should be set in the @flags field. In
+ * this case userspace may optionally omit the remainder of the configuration
+ * block, which will be ignored by the driver.
+ *
+ * When a new configuration of an ISP block needs to be applied userspace
+ * shall fully populate the ISP block and omit setting the
+ * C3_ISP_PARAMS_BLOCK_FL_DISABLED bit in the @flags field.
+ *
+ * Userspace is responsible for correctly populating the parameters block header
+ * fields (@type, @flags and @size) and the block-specific parameters.
+ *
+ * For example:
+ *
+ * .. code-block:: c
+ *
+ *	void populate_pst_gamma(struct c3_isp_params_block_header *block) {
+ *		struct c3_isp_params_pst_gamma *gamma =
+ *			(struct c3_isp_params_pst_gamma *)block;
+ *
+ *		gamma->header.type = C3_ISP_PARAMS_BLOCK_PST_GAMMA;
+ *		gamma->header.flags = C3_ISP_PARAMS_BLOCK_FL_ENABLE;
+ *		gamma->header.size = sizeof(*gamma);
+ *
+ *		for (unsigned int i = 0; i < 129; i++)
+ *			gamma->pst_gamma_lut[i] = i;
+ *	}
+ *
+ * @type: The parameters block type from :c:type:`c3_isp_params_block_type`
+ * @flags: A bitmask of block flags
+ * @size: Size (in bytes) of the parameters block, including this header
+ */
+struct c3_isp_params_block_header {
+	__u16 type;
+	__u16 flags;
+	__u32 size;
+};
+
+/**
+ * struct c3_isp_params_awb_gains - Gains for auto-white balance
+ *
+ * This struct allows users to configure the gains for white balance.
+ * There are four gain settings corresponding to each colour channel in
+ * the bayer domain. All of the gains are stored in Q4.8 format.
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_AWB_GAINS
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: The C3 ISP parameters block header
+ * @gr_gain: Multiplier for Gr channel (Q4.8 format)
+ * @r_gain: Multiplier for R channel (Q4.8 format)
+ * @b_gain: Multiplier for B channel (Q4.8 format)
+ * @gb_gain: Multiplier for Gb channel (Q4.8 format)
+ */
+struct c3_isp_params_awb_gains {
+	struct c3_isp_params_block_header header;
+	__u16 gr_gain;
+	__u16 r_gain;
+	__u16 b_gain;
+	__u16 gb_gain;
+} __attribute__((aligned(8)));
+
+/**
+ * enum c3_isp_params_awb_tap_points - Tap points for the AWB statistics
+ * @C3_ISP_AWB_STATS_TAP_OFE: immediately after the optical frontend block
+ * @C3_ISP_AWB_STATS_TAP_GE: immediately after the green equal block
+ * @C3_ISP_AWB_STATS_TAP_BEFORE_WB: immediately before the white balance block
+ * @C3_ISP_AWB_STATS_TAP_AFTER_WB: immediately after the white balance block
+ */
+enum c3_isp_params_awb_tap_points {
+	C3_ISP_AWB_STATS_TAP_OFE = 0,
+	C3_ISP_AWB_STATS_TAP_GE,
+	C3_ISP_AWB_STATS_TAP_BEFORE_WB,
+	C3_ISP_AWB_STATS_TAP_AFTER_WB,
+};
+
+/**
+ * struct c3_isp_params_awb_config - Stats settings for auto-white balance
+ *
+ * This struct allows the configuration of the statistics generated for auto
+ * white balance.
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_AWB_CONFIG
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: the C3 ISP parameters block header
+ * @tap_point: the tap point from enum c3_isp_params_awb_tap_point
+ * @satur_vald: AWB statistic over saturation control
+ *		value: 0: disable, 1: enable
+ * @horiz_zones_num: active number of hotizontal zones [0..32]
+ * @vert_zones_num: active number of vertical zones [0..24]
+ * @rg_min: minimum R/G ratio (Q4.8 format)
+ * @rg_max: maximum R/G ratio (Q4.8 format)
+ * @bg_min: minimum B/G ratio (Q4.8 format)
+ * @bg_max: maximum B/G ratio (Q4.8 format)
+ * @rg_low: R/G ratio trim low (Q4.8 format)
+ * @rg_high: R/G ratio trim hight (Q4.8 format)
+ * @bg_low: B/G ratio trim low (Q4.8 format)
+ * @bg_high: B/G ratio trim high (Q4.8 format)
+ * @zone_weight: array of weights for AWB statistics zones [0..15]
+ * @horiz_coord: the horizontal coordinate of points on the diagonal [0..2888]
+ * @vert_coord: the vertical coordinate of points on the diagonal [0..2240]
+ */
+struct c3_isp_params_awb_config {
+	struct c3_isp_params_block_header header;
+	__u8 tap_point;
+	__u8 satur_vald;
+	__u8 horiz_zones_num;
+	__u8 vert_zones_num;
+	__u16 rg_min;
+	__u16 rg_max;
+	__u16 bg_min;
+	__u16 bg_max;
+	__u16 rg_low;
+	__u16 rg_high;
+	__u16 bg_low;
+	__u16 bg_high;
+	__u8 zone_weight[C3_ISP_AWB_MAX_ZONES];
+	__u16 horiz_coord[C3_ISP_AWB_MAX_PT_NUM];
+	__u16 vert_coord[C3_ISP_AWB_MAX_PT_NUM];
+} __attribute__((aligned(8)));
+
+/**
+ * enum c3_isp_params_ae_tap_points - Tap points for the AE statistics
+ * @C3_ISP_AE_STATS_TAP_GE: immediately after the green equal block
+ * @C3_ISP_AE_STATS_TAP_MLS: immediately after the mesh lens shading block
+ */
+enum c3_isp_params_ae_tap_points {
+	C3_ISP_AE_STATS_TAP_GE = 0,
+	C3_ISP_AE_STATS_TAP_MLS,
+};
+
+/**
+ * struct c3_isp_params_ae_config - Stats settings for auto-exposure
+ *
+ * This struct allows the configuration of the statistics generated for
+ * auto exposure.
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_AE_CONFIG
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: the C3 ISP parameters block header
+ * @horiz_zones_num: active number of horizontal zones [0..17]
+ * @vert_zones_num: active number of vertical zones [0..15]
+ * @tap_point: the tap point from enum c3_isp_params_ae_tap_point
+ * @zone_weight: array of weights for AE statistics zones [0..15]
+ * @horiz_coord: the horizontal coordinate of points on the diagonal [0..2888]
+ * @vert_coord: the vertical coordinate of points on the diagonal [0..2240]
+ * @reserved: applications must zero this array
+ */
+struct c3_isp_params_ae_config {
+	struct c3_isp_params_block_header header;
+	__u8 tap_point;
+	__u8 horiz_zones_num;
+	__u8 vert_zones_num;
+	__u8 zone_weight[C3_ISP_AE_MAX_ZONES];
+	__u16 horiz_coord[C3_ISP_AE_MAX_PT_NUM];
+	__u16 vert_coord[C3_ISP_AE_MAX_PT_NUM];
+	__u16 reserved[3];
+} __attribute__((aligned(8)));
+
+/**
+ * enum c3_isp_params_af_tap_points - Tap points for the AF statistics
+ * @C3_ISP_AF_STATS_TAP_SNR: immediately after the spatial noise reduce block
+ * @C3_ISP_AF_STATS_TAP_DMS: immediately after the demosaic block
+ */
+enum c3_isp_params_af_tap_points {
+	C3_ISP_AF_STATS_TAP_SNR = 0,
+	C3_ISP_AF_STATS_TAP_DMS,
+};
+
+/**
+ * struct c3_isp_params_af_config - Stats settings for auto-focus
+ *
+ * This struct allows the configuration of the statistics generated for
+ * auto focus.
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_AF_CONFIG
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: the C3 ISP parameters block header
+ * @tap_point: the tap point from enum c3_isp_params_af_tap_point
+ * @horiz_zones_num: active number of hotizontal zones [0..17]
+ * @vert_zones_num: active number of vertical zones [0..15]
+ * @reserved: applications must zero this array
+ * @horiz_coord: the horizontal coordinate of points on the diagonal [0..2888]
+ * @vert_coord: the vertical coordinate of points on the diagonal [0..2240]
+ */
+struct c3_isp_params_af_config {
+	struct c3_isp_params_block_header header;
+	__u8 tap_point;
+	__u8 horiz_zones_num;
+	__u8 vert_zones_num;
+	__u8 reserved[5];
+	__u16 horiz_coord[C3_ISP_AF_MAX_PT_NUM];
+	__u16 vert_coord[C3_ISP_AF_MAX_PT_NUM];
+} __attribute__((aligned(8)));
+
+/**
+ * struct c3_isp_params_pst_gamma - Post gamma configuration
+ *
+ * This struct allows the configuration of the look up table for
+ * post gamma. The gamma curve consists of 129 points, so need to
+ * set lut[129].
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_PST_GAMMA
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: the C3 ISP parameters block header
+ * @lut: lookup table for P-Stitch gamma [0..1023]
+ * @reserved: applications must zero this array
+ */
+struct c3_isp_params_pst_gamma {
+	struct c3_isp_params_block_header header;
+	__u16 lut[129];
+	__u16 reserved[3];
+} __attribute__((aligned(8)));
+
+/**
+ * struct c3_isp_params_ccm - ISP CCM configuration
+ *
+ * This struct allows the configuration of the matrix for
+ * color correction. The matrix consists of 3 x 3 points,
+ * so need to set matrix[3][3].
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_CCM
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: the C3 ISP parameters block header
+ * @matrix: a 3 x 3 matrix used for color correction,
+ *          the value of matrix[x][y] is orig_value x 256. [-4096..4095]
+ * @reserved: applications must zero this array
+ */
+struct c3_isp_params_ccm {
+	struct c3_isp_params_block_header header;
+	__s16 matrix[3][3];
+	__u16 reserved[3];
+} __attribute__((aligned(8)));
+
+/**
+ * struct c3_isp_params_csc - ISP Color Space Conversion configuration
+ *
+ * This struct allows the configuration of the matrix for color space
+ * conversion. The matrix consists of 3 x 3 points, so need to set matrix[3][3].
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_CSC
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: the C3 ISP parameters block header
+ * @matrix: a 3x3 matrix used for the color space conversion,
+ *          the value of matrix[x][y] is orig_value x 256. [-4096..4095]
+ * @reserved: applications must zero this array
+ */
+struct c3_isp_params_csc {
+	struct c3_isp_params_block_header header;
+	__s16 matrix[3][3];
+	__u16 reserved[3];
+} __attribute__((aligned(8)));
+
+/**
+ * struct c3_isp_params_blc - ISP Black Level Correction configuration
+ *
+ * This struct allows the configuration of the block level offset for each
+ * color channel.
+ *
+ * header.type should be set to C3_ISP_PARAMS_BLOCK_BLC
+ * from :c:type:`c3_isp_params_block_type`
+ *
+ * @header: the C3 ISP parameters block header
+ * @gr_ofst: Gr blc offset (Q4.12 format)
+ * @r_ofst: R blc offset (Q4.12 format)
+ * @b_ofst: B blc offset (Q4.12 format)
+ * @gb_ofst: Gb blc offset(Q4.12 format)
+ */
+struct c3_isp_params_blc {
+	struct c3_isp_params_block_header header;
+	__u16 gr_ofst;
+	__u16 r_ofst;
+	__u16 b_ofst;
+	__u16 gb_ofst;
+};
+
+/**
+ * define C3_ISP_PARAMS_MAX_SIZE - Maximum size of all C3 ISP Parameters
+ *
+ * Though the parameters for the C3 ISP are passed as optional blocks, the
+ * driver still needs to know the absolute maximum size so that it can allocate
+ * a buffer sized appropriately to accommodate userspace attempting to set all
+ * possible parameters in a single frame.
+ */
+#define C3_ISP_PARAMS_MAX_SIZE                     \
+	(sizeof(struct c3_isp_params_awb_gains) +  \
+	 sizeof(struct c3_isp_params_awb_config) + \
+	 sizeof(struct c3_isp_params_ae_config) +  \
+	 sizeof(struct c3_isp_params_af_config) +  \
+	 sizeof(struct c3_isp_params_pst_gamma) +  \
+	 sizeof(struct c3_isp_params_ccm) +        \
+	 sizeof(struct c3_isp_params_csc) +        \
+	 sizeof(struct c3_isp_params_blc))
+
+/**
+ * struct c3_isp_params_cfg - C3 ISP configuration parameters
+ *
+ * This struct contains the configuration parameters of the C3 ISP
+ * algorithms, serialized by userspace into an opaque data buffer. Each
+ * configuration parameter block is represented by a block-specific structure
+ * which contains a :c:type:`c3_isp_param_block_header` entry as first
+ * member. Userspace populates the @data buffer with configuration parameters
+ * for the blocks that it intends to configure. As a consequence, the data
+ * buffer effective size changes according to the number of ISP blocks that
+ * userspace intends to configure.
+ *
+ * The parameters buffer is versioned by the @version field to allow modifying
+ * and extending its definition. Userspace should populate the @version field to
+ * inform the driver about the version it intends to use. The driver will parse
+ * and handle the @data buffer according to the data layout specific to the
+ * indicated revision and return an error if the desired revision is not
+ * supported.
+ *
+ * For each ISP block that userspace wants to configure, a block-specific
+ * structure is appended to the @data buffer, one after the other without gaps
+ * in between nor overlaps. Userspace shall populate the @total_size field with
+ * the effective size, in bytes, of the @data buffer.
+ *
+ * The expected memory layout of the parameters buffer is::
+ *
+ *	+-------------------- struct c3_isp_params_cfg ---- ------------------+
+ *	| version = C3_ISP_PARAM_BUFFER_V0;                                   |
+ *	| data_size = sizeof(struct c3_isp_params_awb_gains) +                |
+ *	|              sizeof(struct c3_isp_params_awb_config);       |
+ *	| +------------------------- data  ---------------------------------+ |
+ *	| | +------------ struct c3_isp_params_awb_gains) ------------------+ |
+ *	| | | +---------  struct c3_isp_params_block_header header -----+ | | |
+ *	| | | | type = C3_ISP_PARAMS_BLOCK_AWB_GAINS;                   | | | |
+ *	| | | | flags = C3_ISP_PARAMS_BLOCK_FL_NONE;                    | | | |
+ *	| | | | size = sizeof(struct c3_isp_params_awb_gains);          | | | |
+ *	| | | +---------------------------------------------------------+ | | |
+ *	| | | gr_gain = ...;                                              | | |
+ *	| | | r_gain = ...;                                               | | |
+ *	| | | b_gain = ...;                                               | | |
+ *	| | | gb_gain = ...;                                              | | |
+ *	| | +------------------ struct c3_isp_params_awb_config ----------+ | |
+ *	| | | +---------- struct c3_isp_param_block_header header ------+ | | |
+ *	| | | | type = C3_ISP_PARAMS_BLOCK_AWB_CONFIG;                  | | | |
+ *	| | | | flags = C3_ISP_PARAMS_BLOCK_FL_NONE;                    | | | |
+ *	| | | | size = sizeof(struct c3_isp_params_awb_config)          | | | |
+ *	| | | +---------------------------------------------------------+ | | |
+ *	| | | tap_point = ...;                                            | | |
+ *	| | | satur_vald = ...;                                           | | |
+ *	| | | horiz_zones_num = ...;                                      | | |
+ *	| | | vert_zones_num = ...;                                       | | |
+ *	| | +-------------------------------------------------------------+ | |
+ *	| +-----------------------------------------------------------------+ |
+ *	+---------------------------------------------------------------------+
+ *
+ * @version: The C3 ISP parameters buffer version
+ * @data_size: The C3 ISP configuration data effective size, excluding this
+ *             header
+ * @data: The C3 ISP configuration blocks data
+ */
+struct c3_isp_params_cfg {
+	__u32 version;
+	__u32 data_size;
+	__u8 data[C3_ISP_PARAMS_MAX_SIZE];
+};
+
+#endif