drm/amd/display: Remove unused cm3_helper_translate_curve_to_degamma_hw_format

cm3_helper_translate_curve_to_degamma_hw_format() since it was added in
2020's commit
03f54d7d3448 ("drm/amd/display: Add DCN3 DPP")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c

···
 	return true;
 }
 
-#define NUM_DEGAMMA_REGIONS    12
-
-
-bool cm3_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];
-
-	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) {
-		if (dc_fixpt_lt(rgb_plus_1->red, rgb->red))
-			rgb_plus_1->red = rgb->red;
-		if (dc_fixpt_lt(rgb_plus_1->green, rgb->green))
-			rgb_plus_1->green = rgb->green;
-		if (dc_fixpt_lt(rgb_plus_1->blue, rgb->blue))
-			rgb_plus_1->blue = rgb->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);
-
-		++rgb_plus_1;
-		++rgb;
-		++i;
-	}
-	cm3_helper_convert_to_custom_float(rgb_resulted,
-						lut_params->corner_points,
-						hw_points, false);
-
-	return true;
-}
-
 bool cm3_helper_convert_to_custom_float(
 		struct pwl_result_data *rgb_resulted,
 		struct curve_points3 *corner_points,

drivers/gpu/drm/amd/display/dc/dwb/dcn30/dcn30_cm_common.h

···
 	const struct dc_transfer_func *output_tf,
 	struct pwl_params *lut_params, bool fixpoint);
 
-bool cm3_helper_translate_curve_to_degamma_hw_format(
-				const struct dc_transfer_func *output_tf,
-				struct pwl_params *lut_params);
-
 bool cm3_helper_convert_to_custom_float(
 		struct pwl_result_data *rgb_resulted,
 		struct curve_points3 *corner_points,