/*
 * Copyright 2016 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */
#include "dc.h"
#include "reg_helper.h"
#include "dcn10/dcn10_dpp.h"

#include "dcn10_cm_common.h"
#include "custom_float.h"

#define REG(reg) reg

#define CTX \
        ctx

#undef FN
#define FN(reg_name, field_name) \
        reg->shifts.field_name, reg->masks.field_name

void cm_helper_program_color_matrices(
                struct dc_context *ctx,
                const uint16_t *regval,
                const struct color_matrices_reg *reg)
{
        uint32_t cur_csc_reg;
        unsigned int i = 0;

        for (cur_csc_reg = reg->csc_c11_c12;
                        cur_csc_reg <= reg->csc_c33_c34;
                        cur_csc_reg++) {

                const uint16_t *regval0 = &(regval[2 * i]);
                const uint16_t *regval1 = &(regval[(2 * i) + 1]);

                REG_SET_2(cur_csc_reg, 0,
                                csc_c11, *regval0,
                                csc_c12, *regval1);

                i++;
        }

}

void cm_helper_read_color_matrices(struct dc_context *ctx,
                                   uint16_t *regval,
                                   const struct color_matrices_reg *reg)
{
        uint32_t cur_csc_reg, regval0, regval1;
        unsigned int i = 0;

        for (cur_csc_reg = reg->csc_c11_c12;
             cur_csc_reg <= reg->csc_c33_c34; cur_csc_reg++) {
                REG_GET_2(cur_csc_reg,
                                csc_c11, &regval0,
                                csc_c12, &regval1);

                regval[2 * i] = regval0;
                regval[(2 * i) + 1] = regval1;

                i++;
        }
}

void cm_helper_program_xfer_func(
                struct dc_context *ctx,
                const struct pwl_params *params,
                const struct xfer_func_reg *reg)
{
        uint32_t reg_region_cur;
        unsigned int i = 0;

        REG_SET_2(reg->start_cntl_b, 0,
                        exp_region_start, params->corner_points[0].blue.custom_float_x,
                        exp_resion_start_segment, 0);
        REG_SET_2(reg->start_cntl_g, 0,
                        exp_region_start, params->corner_points[0].green.custom_float_x,
                        exp_resion_start_segment, 0);
        REG_SET_2(reg->start_cntl_r, 0,
                        exp_region_start, params->corner_points[0].red.custom_float_x,
                        exp_resion_start_segment, 0);

        REG_SET(reg->start_slope_cntl_b, 0,
                        field_region_linear_slope, params->corner_points[0].blue.custom_float_slope);
        REG_SET(reg->start_slope_cntl_g, 0,
                        field_region_linear_slope, params->corner_points[0].green.custom_float_slope);
        REG_SET(reg->start_slope_cntl_r, 0,
                        field_region_linear_slope, params->corner_points[0].red.custom_float_slope);

        REG_SET(reg->start_end_cntl1_b, 0,
                        field_region_end, params->corner_points[1].blue.custom_float_x);
        REG_SET_2(reg->start_end_cntl2_b, 0,
                        field_region_end_slope, params->corner_points[1].blue.custom_float_slope,
                        field_region_end_base, params->corner_points[1].blue.custom_float_y);

        REG_SET(reg->start_end_cntl1_g, 0,
                        field_region_end, params->corner_points[1].green.custom_float_x);
        REG_SET_2(reg->start_end_cntl2_g, 0,
                        field_region_end_slope, params->corner_points[1].green.custom_float_slope,
                field_region_end_base, params->corner_points[1].green.custom_float_y);

        REG_SET(reg->start_end_cntl1_r, 0,
                        field_region_end, params->corner_points[1].red.custom_float_x);
        REG_SET_2(reg->start_end_cntl2_r, 0,
                        field_region_end_slope, params->corner_points[1].red.custom_float_slope,
                field_region_end_base, params->corner_points[1].red.custom_float_y);

        for (reg_region_cur = reg->region_start;
                        reg_region_cur <= reg->region_end;
                        reg_region_cur++) {

                const struct gamma_curve *curve0 = &(params->arr_curve_points[2 * i]);
                const struct gamma_curve *curve1 = &(params->arr_curve_points[(2 * i) + 1]);

                REG_SET_4(reg_region_cur, 0,
                                exp_region0_lut_offset, curve0->offset,
                                exp_region0_num_segments, curve0->segments_num,
                                exp_region1_lut_offset, curve1->offset,
                                exp_region1_num_segments, curve1->segments_num);

                i++;
        }

}



bool cm_helper_convert_to_custom_float(
                struct pwl_result_data *rgb_resulted,
                struct curve_points3 *corner_points,
                uint32_t hw_points_num,
                bool fixpoint)
{
        struct custom_float_format fmt;

        struct pwl_result_data *rgb = rgb_resulted;

        uint32_t i = 0;

        fmt.exponenta_bits = 6;
        fmt.mantissa_bits = 12;
        fmt.sign = false;

        /* corner_points[0] - beginning base, slope offset for R,G,B
         * corner_points[1] - end base, slope offset for R,G,B
         */
        if (!convert_to_custom_float_format(corner_points[0].red.x, &fmt,
                                &corner_points[0].red.custom_float_x)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[0].green.x, &fmt,
                                &corner_points[0].green.custom_float_x)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[0].blue.x, &fmt,
                                &corner_points[0].blue.custom_float_x)) {
                BREAK_TO_DEBUGGER();
                return false;
        }

        if (!convert_to_custom_float_format(corner_points[0].red.offset, &fmt,
                                &corner_points[0].red.custom_float_offset)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[0].green.offset, &fmt,
                                &corner_points[0].green.custom_float_offset)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[0].blue.offset, &fmt,
                                &corner_points[0].blue.custom_float_offset)) {
                BREAK_TO_DEBUGGER();
                return false;
        }

        if (!convert_to_custom_float_format(corner_points[0].red.slope, &fmt,
                                &corner_points[0].red.custom_float_slope)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[0].green.slope, &fmt,
                                &corner_points[0].green.custom_float_slope)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[0].blue.slope, &fmt,
                                &corner_points[0].blue.custom_float_slope)) {
                BREAK_TO_DEBUGGER();
                return false;
        }

        fmt.mantissa_bits = 10;
        fmt.sign = false;

        if (!convert_to_custom_float_format(corner_points[1].red.x, &fmt,
                                &corner_points[1].red.custom_float_x)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[1].green.x, &fmt,
                                &corner_points[1].green.custom_float_x)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[1].blue.x, &fmt,
                                &corner_points[1].blue.custom_float_x)) {
                BREAK_TO_DEBUGGER();
                return false;
        }

        if (fixpoint == true) {
                corner_points[1].red.custom_float_y =
                                dc_fixpt_clamp_u0d14(corner_points[1].red.y);
                corner_points[1].green.custom_float_y =
                                dc_fixpt_clamp_u0d14(corner_points[1].green.y);
                corner_points[1].blue.custom_float_y =
                                dc_fixpt_clamp_u0d14(corner_points[1].blue.y);
        } else {
                if (!convert_to_custom_float_format(corner_points[1].red.y,
                                &fmt, &corner_points[1].red.custom_float_y)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }
                if (!convert_to_custom_float_format(corner_points[1].green.y,
                                &fmt, &corner_points[1].green.custom_float_y)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }
                if (!convert_to_custom_float_format(corner_points[1].blue.y,
                                &fmt, &corner_points[1].blue.custom_float_y)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }
        }

        if (!convert_to_custom_float_format(corner_points[1].red.slope, &fmt,
                                &corner_points[1].red.custom_float_slope)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[1].green.slope, &fmt,
                                &corner_points[1].green.custom_float_slope)) {
                BREAK_TO_DEBUGGER();
                return false;
        }
        if (!convert_to_custom_float_format(corner_points[1].blue.slope, &fmt,
                                &corner_points[1].blue.custom_float_slope)) {
                BREAK_TO_DEBUGGER();
                return false;
        }

        if (hw_points_num == 0 || rgb_resulted == NULL || fixpoint == true)
                return true;

        fmt.mantissa_bits = 12;
        fmt.sign = true;

        while (i != hw_points_num) {
                if (!convert_to_custom_float_format(rgb->red, &fmt,
                                                    &rgb->red_reg)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }

                if (!convert_to_custom_float_format(rgb->green, &fmt,
                                                    &rgb->green_reg)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }

                if (!convert_to_custom_float_format(rgb->blue, &fmt,
                                                    &rgb->blue_reg)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }

                if (!convert_to_custom_float_format(rgb->delta_red, &fmt,
                                                    &rgb->delta_red_reg)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }

                if (!convert_to_custom_float_format(rgb->delta_green, &fmt,
                                                    &rgb->delta_green_reg)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }

                if (!convert_to_custom_float_format(rgb->delta_blue, &fmt,
                                                    &rgb->delta_blue_reg)) {
                        BREAK_TO_DEBUGGER();
                        return false;
                }

                ++rgb;
                ++i;
        }

        return true;
}

/* driver uses 32 regions or less, but DCN HW has 34, extra 2 are set to 0 */
#define MAX_REGIONS_NUMBER 34
#define MAX_LOW_POINT      25
#define NUMBER_REGIONS     32
#define NUMBER_SW_SEGMENTS 16

#define DC_LOGGER \
                ctx->logger

bool cm_helper_translate_curve_to_hw_format(struct dc_context *ctx,
                                const struct dc_transfer_func *output_tf,
                                struct pwl_params *lut_params, bool fixpoint)
{
        struct curve_points3 *corner_points;
        struct pwl_result_data *rgb_resulted;
        struct pwl_result_data *rgb;
        struct pwl_result_data *rgb_plus_1;
        struct pwl_result_data *rgb_minus_1;

        int32_t region_start, region_end;
        int32_t i;
        uint32_t j, k, seg_distr[MAX_REGIONS_NUMBER], increment, start_index, hw_points;

        if (output_tf == NULL || lut_params == NULL || output_tf->type == TF_TYPE_BYPASS)
                return false;

        corner_points = lut_params->corner_points;
        rgb_resulted = lut_params->rgb_resulted;
        hw_points = 0;

        memset(lut_params, 0, sizeof(struct pwl_params));
        memset(seg_distr, 0, sizeof(seg_distr));

        if (output_tf->tf == TRANSFER_FUNCTION_PQ || output_tf->tf == TRANSFER_FUNCTION_GAMMA22) {
                /* 32 segments
                 * segments are from 2^-25 to 2^7
                 */
                for (i = 0; i < NUMBER_REGIONS ; i++)
                        seg_distr[i] = 3;

                region_start = -MAX_LOW_POINT;
                region_end   = NUMBER_REGIONS - MAX_LOW_POINT;
        } else {
                /* 13 segments
                 * segment is from 2^-12 to 2^0
                 * There are less than 256 points, for optimization
                 */
                const uint8_t SEG_COUNT = 12;

                for (i = 0; i < SEG_COUNT; i++)
                        seg_distr[i] = 4;

                seg_distr[SEG_COUNT] = 1;

                region_start = -SEG_COUNT;
                region_end = 1;
        }

        for (i = region_end - region_start; i < MAX_REGIONS_NUMBER ; i++)
                seg_distr[i] = -1;

        for (k = 0; k < MAX_REGIONS_NUMBER; k++) {
                if (seg_distr[k] != -1)
                        hw_points += (1 << seg_distr[k]);
        }

        j = 0;
        for (k = 0; k < (region_end - region_start); k++) {
                increment = NUMBER_SW_SEGMENTS / (1 << seg_distr[k]);
                start_index = (region_start + k + MAX_LOW_POINT) *
                                NUMBER_SW_SEGMENTS;
                for (i = start_index; i < start_index + NUMBER_SW_SEGMENTS;
                                i += increment) {
                        if (j == hw_points - 1)
                                break;
                        if (i >= TRANSFER_FUNC_POINTS) {
                                DC_LOG_ERROR("Index out of bounds: i=%d, TRANSFER_FUNC_POINTS=%d\n",
                                             i, TRANSFER_FUNC_POINTS);
                                return false;
                        }
                        rgb_resulted[j].red = output_tf->tf_pts.red[i];
                        rgb_resulted[j].green = output_tf->tf_pts.green[i];
                        rgb_resulted[j].blue = output_tf->tf_pts.blue[i];
                        j++;
                }
        }

        /* last point */
        start_index = (region_end + MAX_LOW_POINT) * NUMBER_SW_SEGMENTS;
        rgb_resulted[hw_points - 1].red = output_tf->tf_pts.red[start_index];
        rgb_resulted[hw_points - 1].green = output_tf->tf_pts.green[start_index];
        rgb_resulted[hw_points - 1].blue = output_tf->tf_pts.blue[start_index];

        rgb_resulted[hw_points].red = rgb_resulted[hw_points - 1].red;
        rgb_resulted[hw_points].green = rgb_resulted[hw_points - 1].green;
        rgb_resulted[hw_points].blue = rgb_resulted[hw_points - 1].blue;

        // All 3 color channels have same x
        corner_points[0].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
                                             dc_fixpt_from_int(region_start));
        corner_points[0].green.x = corner_points[0].red.x;
        corner_points[0].blue.x = corner_points[0].red.x;

        corner_points[1].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
                                             dc_fixpt_from_int(region_end));
        corner_points[1].green.x = corner_points[1].red.x;
        corner_points[1].blue.x = corner_points[1].red.x;

        corner_points[0].red.y = rgb_resulted[0].red;
        corner_points[0].green.y = rgb_resulted[0].green;
        corner_points[0].blue.y = rgb_resulted[0].blue;

        corner_points[0].red.slope = dc_fixpt_div(corner_points[0].red.y,
                        corner_points[0].red.x);
        corner_points[0].green.slope = dc_fixpt_div(corner_points[0].green.y,
                        corner_points[0].green.x);
        corner_points[0].blue.slope = dc_fixpt_div(corner_points[0].blue.y,
                        corner_points[0].blue.x);

        /* see comment above, m_arrPoints[1].y should be the Y value for the
         * region end (m_numOfHwPoints), not last HW point(m_numOfHwPoints - 1)
         */
        corner_points[1].red.y = rgb_resulted[hw_points - 1].red;
        corner_points[1].green.y = rgb_resulted[hw_points - 1].green;
        corner_points[1].blue.y = rgb_resulted[hw_points - 1].blue;
        corner_points[1].red.slope = dc_fixpt_zero;
        corner_points[1].green.slope = dc_fixpt_zero;
        corner_points[1].blue.slope = dc_fixpt_zero;

        if (output_tf->tf == TRANSFER_FUNCTION_PQ) {
                /* for PQ, we want to have a straight line from last HW X point,
                 * and the slope to be such that we hit 1.0 at 10000 nits.
                 */
                const struct fixed31_32 end_value =
                                dc_fixpt_from_int(125);

                corner_points[1].red.slope = dc_fixpt_div(
                        dc_fixpt_sub(dc_fixpt_one, corner_points[1].red.y),
                        dc_fixpt_sub(end_value, corner_points[1].red.x));
                corner_points[1].green.slope = dc_fixpt_div(
                        dc_fixpt_sub(dc_fixpt_one, corner_points[1].green.y),
                        dc_fixpt_sub(end_value, corner_points[1].green.x));
                corner_points[1].blue.slope = dc_fixpt_div(
                        dc_fixpt_sub(dc_fixpt_one, corner_points[1].blue.y),
                        dc_fixpt_sub(end_value, corner_points[1].blue.x));
        }

        lut_params->hw_points_num = hw_points;

        k = 0;
        for (i = 1; i < MAX_REGIONS_NUMBER; i++) {
                if (seg_distr[k] != -1) {
                        lut_params->arr_curve_points[k].segments_num =
                                        seg_distr[k];
                        lut_params->arr_curve_points[i].offset =
                                        lut_params->arr_curve_points[k].offset + (1 << seg_distr[k]);
                }
                k++;
        }

        if (seg_distr[k] != -1)
                lut_params->arr_curve_points[k].segments_num = seg_distr[k];

        rgb = rgb_resulted;
        rgb_plus_1 = rgb_resulted + 1;
        rgb_minus_1 = rgb;

        i = 1;
        while (i != hw_points + 1) {

                if (i >= hw_points - 1) {
                        if (dc_fixpt_lt(rgb_plus_1->red, rgb->red))
                                rgb_plus_1->red = dc_fixpt_add(rgb->red, rgb_minus_1->delta_red);
                        if (dc_fixpt_lt(rgb_plus_1->green, rgb->green))
                                rgb_plus_1->green = dc_fixpt_add(rgb->green, rgb_minus_1->delta_green);
                        if (dc_fixpt_lt(rgb_plus_1->blue, rgb->blue))
                                rgb_plus_1->blue = dc_fixpt_add(rgb->blue, rgb_minus_1->delta_blue);
                }

                rgb->delta_red   = dc_fixpt_sub(rgb_plus_1->red,   rgb->red);
                rgb->delta_green = dc_fixpt_sub(rgb_plus_1->green, rgb->green);
                rgb->delta_blue  = dc_fixpt_sub(rgb_plus_1->blue,  rgb->blue);


                if (fixpoint == true) {
                        uint32_t red_clamp = dc_fixpt_clamp_u0d14(rgb->delta_red);
                        uint32_t green_clamp = dc_fixpt_clamp_u0d14(rgb->delta_green);
                        uint32_t blue_clamp = dc_fixpt_clamp_u0d14(rgb->delta_blue);

                        if (red_clamp >> 10 || green_clamp >> 10 || blue_clamp >> 10)
                                DC_LOG_WARNING("Losing delta precision while programming shaper LUT.");

                        rgb->delta_red_reg   = red_clamp & 0x3ff;
                        rgb->delta_green_reg = green_clamp & 0x3ff;
                        rgb->delta_blue_reg  = blue_clamp & 0x3ff;
                        rgb->red_reg         = dc_fixpt_clamp_u0d14(rgb->red);
                        rgb->green_reg       = dc_fixpt_clamp_u0d14(rgb->green);
                        rgb->blue_reg        = dc_fixpt_clamp_u0d14(rgb->blue);
                }

                ++rgb_plus_1;
                rgb_minus_1 = rgb;
                ++rgb;
                ++i;
        }
        cm_helper_convert_to_custom_float(rgb_resulted,
                                                lut_params->corner_points,
                                                hw_points, fixpoint);

        return true;
}

#define NUM_DEGAMMA_REGIONS    12


bool cm_helper_translate_curve_to_degamma_hw_format(
                                const struct dc_transfer_func *output_tf,
                                struct pwl_params *lut_params)
{
        struct curve_points3 *corner_points;
        struct pwl_result_data *rgb_resulted;
        struct pwl_result_data *rgb;
        struct pwl_result_data *rgb_plus_1;

        int32_t region_start, region_end;
        int32_t i;
        uint32_t j, k, seg_distr[MAX_REGIONS_NUMBER], increment, start_index, hw_points;

        if (output_tf == NULL || lut_params == NULL || output_tf->type == TF_TYPE_BYPASS)
                return false;

        corner_points = lut_params->corner_points;
        rgb_resulted = lut_params->rgb_resulted;
        hw_points = 0;

        memset(lut_params, 0, sizeof(struct pwl_params));
        memset(seg_distr, 0, sizeof(seg_distr));

        region_start = -NUM_DEGAMMA_REGIONS;
        region_end   = 0;


        for (i = region_end - region_start; i < MAX_REGIONS_NUMBER ; i++)
                seg_distr[i] = -1;
        /* 12 segments
         * segments are from 2^-12 to 0
         */
        for (i = 0; i < NUM_DEGAMMA_REGIONS ; i++)
                seg_distr[i] = 4;

        for (k = 0; k < MAX_REGIONS_NUMBER; k++) {
                if (seg_distr[k] != -1)
                        hw_points += (1 << seg_distr[k]);
        }

        j = 0;
        for (k = 0; k < (region_end - region_start); k++) {
                increment = NUMBER_SW_SEGMENTS / (1 << seg_distr[k]);
                start_index = (region_start + k + MAX_LOW_POINT) *
                                NUMBER_SW_SEGMENTS;
                for (i = start_index; i < start_index + NUMBER_SW_SEGMENTS;
                                i += increment) {
                        if (j == hw_points - 1)
                                break;
                        if (i >= TRANSFER_FUNC_POINTS)
                                return false;
                        rgb_resulted[j].red = output_tf->tf_pts.red[i];
                        rgb_resulted[j].green = output_tf->tf_pts.green[i];
                        rgb_resulted[j].blue = output_tf->tf_pts.blue[i];
                        j++;
                }
        }

        /* last point */
        start_index = (region_end + MAX_LOW_POINT) * NUMBER_SW_SEGMENTS;
        rgb_resulted[hw_points - 1].red = output_tf->tf_pts.red[start_index];
        rgb_resulted[hw_points - 1].green = output_tf->tf_pts.green[start_index];
        rgb_resulted[hw_points - 1].blue = output_tf->tf_pts.blue[start_index];

        rgb_resulted[hw_points].red = rgb_resulted[hw_points - 1].red;
        rgb_resulted[hw_points].green = rgb_resulted[hw_points - 1].green;
        rgb_resulted[hw_points].blue = rgb_resulted[hw_points - 1].blue;

        corner_points[0].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
                                             dc_fixpt_from_int(region_start));
        corner_points[0].green.x = corner_points[0].red.x;
        corner_points[0].blue.x = corner_points[0].red.x;
        corner_points[1].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
                                             dc_fixpt_from_int(region_end));
        corner_points[1].green.x = corner_points[1].red.x;
        corner_points[1].blue.x = corner_points[1].red.x;

        corner_points[0].red.y = rgb_resulted[0].red;
        corner_points[0].green.y = rgb_resulted[0].green;
        corner_points[0].blue.y = rgb_resulted[0].blue;

        /* see comment above, m_arrPoints[1].y should be the Y value for the
         * region end (m_numOfHwPoints), not last HW point(m_numOfHwPoints - 1)
         */
        corner_points[1].red.y = rgb_resulted[hw_points - 1].red;
        corner_points[1].green.y = rgb_resulted[hw_points - 1].green;
        corner_points[1].blue.y = rgb_resulted[hw_points - 1].blue;
        corner_points[1].red.slope = dc_fixpt_zero;
        corner_points[1].green.slope = dc_fixpt_zero;
        corner_points[1].blue.slope = dc_fixpt_zero;

        if (output_tf->tf == TRANSFER_FUNCTION_PQ) {
                /* for PQ, we want to have a straight line from last HW X point,
                 * and the slope to be such that we hit 1.0 at 10000 nits.
                 */
                const struct fixed31_32 end_value =
                                dc_fixpt_from_int(125);

                corner_points[1].red.slope = dc_fixpt_div(
                        dc_fixpt_sub(dc_fixpt_one, corner_points[1].red.y),
                        dc_fixpt_sub(end_value, corner_points[1].red.x));
                corner_points[1].green.slope = dc_fixpt_div(
                        dc_fixpt_sub(dc_fixpt_one, corner_points[1].green.y),
                        dc_fixpt_sub(end_value, corner_points[1].green.x));
                corner_points[1].blue.slope = dc_fixpt_div(
                        dc_fixpt_sub(dc_fixpt_one, corner_points[1].blue.y),
                        dc_fixpt_sub(end_value, corner_points[1].blue.x));
        }

        lut_params->hw_points_num = hw_points;

        k = 0;
        for (i = 1; i < MAX_REGIONS_NUMBER; i++) {
                if (seg_distr[k] != -1) {
                        lut_params->arr_curve_points[k].segments_num =
                                        seg_distr[k];
                        lut_params->arr_curve_points[i].offset =
                                        lut_params->arr_curve_points[k].offset + (1 << seg_distr[k]);
                }
                k++;
        }

        if (seg_distr[k] != -1)
                lut_params->arr_curve_points[k].segments_num = seg_distr[k];

        rgb = rgb_resulted;
        rgb_plus_1 = rgb_resulted + 1;

        i = 1;
        while (i != hw_points + 1) {
                rgb->delta_red   = dc_fixpt_sub(rgb_plus_1->red,   rgb->red);
                rgb->delta_green = dc_fixpt_sub(rgb_plus_1->green, rgb->green);
                rgb->delta_blue  = dc_fixpt_sub(rgb_plus_1->blue,  rgb->blue);

                ++rgb_plus_1;
                ++rgb;
                ++i;
        }
        cm_helper_convert_to_custom_float(rgb_resulted,
                                                lut_params->corner_points,
                                                hw_points, false);

        return true;
}