drm/amd/display: remove unused _calculate_degamma_curve function

We don't use this function anywhere, therefore, remove it.

Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Melissa Wen <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/modules/color/color_gamma.c

···
 rgb_user_alloc_fail:
 	return ret;
 }
-
-bool  mod_color_calculate_degamma_curve(enum dc_transfer_func_predefined trans,
-				struct dc_transfer_func_distributed_points *points)
-{
-	uint32_t i;
-	bool ret = false;
-	struct pwl_float_data_ex *rgb_degamma = NULL;
-
-	if (trans == TRANSFER_FUNCTION_UNITY ||
-		trans == TRANSFER_FUNCTION_LINEAR) {
-
-		for (i = 0; i <= MAX_HW_POINTS ; i++) {
-			points->red[i]    = coordinates_x[i].x;
-			points->green[i]  = coordinates_x[i].x;
-			points->blue[i]   = coordinates_x[i].x;
-		}
-		ret = true;
-	} else if (trans == TRANSFER_FUNCTION_PQ) {
-		rgb_degamma = kvcalloc(MAX_HW_POINTS + _EXTRA_POINTS,
-				       sizeof(*rgb_degamma),
-				       GFP_KERNEL);
-		if (!rgb_degamma)
-			goto rgb_degamma_alloc_fail;
-
-
-		build_de_pq(rgb_degamma,
-				MAX_HW_POINTS,
-				coordinates_x);
-		for (i = 0; i <= MAX_HW_POINTS ; i++) {
-			points->red[i]    = rgb_degamma[i].r;
-			points->green[i]  = rgb_degamma[i].g;
-			points->blue[i]   = rgb_degamma[i].b;
-		}
-		ret = true;
-
-		kvfree(rgb_degamma);
-	} else if (trans == TRANSFER_FUNCTION_SRGB ||
-		trans == TRANSFER_FUNCTION_BT709 ||
-		trans == TRANSFER_FUNCTION_GAMMA22 ||
-		trans == TRANSFER_FUNCTION_GAMMA24 ||
-		trans == TRANSFER_FUNCTION_GAMMA26) {
-		rgb_degamma = kvcalloc(MAX_HW_POINTS + _EXTRA_POINTS,
-				       sizeof(*rgb_degamma),
-				       GFP_KERNEL);
-		if (!rgb_degamma)
-			goto rgb_degamma_alloc_fail;
-
-		build_degamma(rgb_degamma,
-				MAX_HW_POINTS,
-				coordinates_x,
-				trans);
-		for (i = 0; i <= MAX_HW_POINTS ; i++) {
-			points->red[i]    = rgb_degamma[i].r;
-			points->green[i]  = rgb_degamma[i].g;
-			points->blue[i]   = rgb_degamma[i].b;
-		}
-		ret = true;
-
-		kvfree(rgb_degamma);
-	} else if (trans == TRANSFER_FUNCTION_HLG) {
-		rgb_degamma = kvcalloc(MAX_HW_POINTS + _EXTRA_POINTS,
-				       sizeof(*rgb_degamma),
-				       GFP_KERNEL);
-		if (!rgb_degamma)
-			goto rgb_degamma_alloc_fail;
-
-		build_hlg_degamma(rgb_degamma,
-				MAX_HW_POINTS,
-				coordinates_x,
-				80, 1000);
-		for (i = 0; i <= MAX_HW_POINTS ; i++) {
-			points->red[i]    = rgb_degamma[i].r;
-			points->green[i]  = rgb_degamma[i].g;
-			points->blue[i]   = rgb_degamma[i].b;
-		}
-		ret = true;
-		kvfree(rgb_degamma);
-	}
-	points->end_exponent = 0;
-	points->x_point_at_y1_red = 1;
-	points->x_point_at_y1_green = 1;
-	points->x_point_at_y1_blue = 1;
-
-rgb_degamma_alloc_fail:
-	return ret;
-}

drivers/gpu/drm/amd/display/modules/color/color_gamma.h

···
 		struct dc_transfer_func *output_tf,
 		const struct dc_gamma *ramp, bool mapUserRamp);
 
-bool mod_color_calculate_degamma_curve(enum dc_transfer_func_predefined trans,
-				struct dc_transfer_func_distributed_points *points);
-
 bool calculate_user_regamma_coeff(struct dc_transfer_func *output_tf,
 		const struct regamma_lut *regamma,
 		struct calculate_buffer *cal_buffer,