Re: [PATCH v5 07/10] media: uapi: Add stats info and parameters buffer for c3 ISP

Keke Li
2025-02-05T06:14:22Z

Hi Jacopo

Thanks very much for your reply.

On 2025/1/23 17:57, Jacopo Mondi wrote:
> [ EXTERNAL EMAIL ]
>
> Hi Keke
>
> On Fri, Dec 27, 2024 at 03:09:16PM +0800, Keke Li via B4 Relay wrote:
>> From: Keke Li <keke.li@amlogic.com>
>>
>> Add a header that describes the 3A statistics buffer and the
>> parameters buffer for c3 ISP
> pahole is now happy and doesn't report holes or padding bytes.
> There are a few issues with documentation which are reported here
> https://gitlab.freedesktop.org/linux-media/users/jmondi/-/jobs/69823163/raw
>
> ./include/uapi/linux/media/amlogic/c3-isp-config.h:272: warning: expecting prototype for enum c3_isp_params_awb_tap_points. Prototype was for enum c3_isp_params_awb_tap_point instead
> ./include/uapi/linux/media/amlogic/c3-isp-config.h:328: warning: expecting prototype for enum c3_isp_params_ae_tap_points. Prototype was for enum c3_isp_params_ae_tap_point instead
> ./include/uapi/linux/media/amlogic/c3-isp-config.h:367: warning: expecting prototype for enum c3_isp_params_af_tap_points. Prototype was for enum c3_isp_params_af_tap_point instead
>
> and possibily more.

Will check this issue.

> With the above fixed (you should be able to check them by yourself by
> building the documentation)
OK, will check them.
> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
>
> Thanks
> j
>
>> Signed-off-by: Keke Li <keke.li@amlogic.com>
>> ---
>> MAINTAINERS | 1 +
>> include/uapi/linux/media/amlogic/c3-isp-config.h | 564 +++++++++++++++++++++++
>> 2 files changed, 565 insertions(+)
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index bdf8b24c773f..274f72c31d9a 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -1248,6 +1248,7 @@ M: Keke Li <keke.li@amlogic.com>
>> L: linux-media@vger.kernel.org
>> S: Maintained
>> F: Documentation/devicetree/bindings/media/amlogic,c3-isp.yaml
>> +F: include/uapi/linux/media/amlogic/
>>
>> AMLOGIC MIPI ADAPTER DRIVER
>> M: Keke Li <keke.li@amlogic.com>
>> diff --git a/include/uapi/linux/media/amlogic/c3-isp-config.h b/include/uapi/linux/media/amlogic/c3-isp-config.h
>> new file mode 100644
>> index 000000000000..ee673ed022c0
>> --- /dev/null
>> +++ b/include/uapi/linux/media/amlogic/c3-isp-config.h
>> @@ -0,0 +1,564 @@
>> +/* 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_FE: 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_point {
>> + 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_cood: the horizontal coordinate of points on the diagonal [0..2888]
>> + * @vert_cood: 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_cood[C3_ISP_AWB_MAX_PT_NUM];
>> + __u16 vert_cood[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_point {
>> + 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_cood: the horizontal coordinate of points on the diagonal [0..2888]
>> + * @vert_cood: 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_cood[C3_ISP_AE_MAX_PT_NUM];
>> + __u16 vert_cood[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_point {
>> + 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_cood: the horizontal coordinate of points on the diagonal [0..2888]
>> + * @vert_cood: 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_cood[C3_ISP_AF_MAX_PT_NUM];
>> + __u16 vert_cood[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 (Q4.8 format)
>> + * @r_ofst: R blc offset (Q4.8 format)
>> + * @b_ofst: B blc offset (Q4.8 format)
>> + * @gb_ofst: Gb blc offset(Q4.8 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
>>
>> --
>> 2.47.1
>>
>>
>>