1/* SPDX-License-Identifier: GPL-2.0 */
2/**
3Support for Intel Camera Imaging ISP subsystem.
4Copyright (c) 2010 - 2015, Intel Corporation.
5
6This program is free software; you can redistribute it and/or modify it
7under the terms and conditions of the GNU General Public License,
8version 2, as published by the Free Software Foundation.
9
10This program is distributed in the hope it will be useful, but WITHOUT
11ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13more details.
14*/
15
16#ifndef _IA_CSS_TNR3_TYPES_H
17#define _IA_CSS_TNR3_TYPES_H
18
19/* @file
20* CSS-API header file for Temporal Noise Reduction v3 (TNR3) kernel
21*/
22
23/**
24 * \brief Number of piecewise linear segments.
25 * \details The parameters to TNR3 are specified as a piecewise linear segment.
26 * The number of such segments is fixed at 3.
27 */
28#define TNR3_NUM_SEGMENTS    3
29
30/* Temporal Noise Reduction v3 (TNR3) configuration.
31 * The parameter to this kernel is fourfold
32 * 1. Three piecewise linear graphs (one for each plane) with three segments
33 * each. Each line graph has Luma values on the x axis and sigma values for
34 * each plane on the y axis. The three linear segments may have a different
35 * slope and the point of Luma value which where the slope may change is called
36 * a "Knee" point. As there are three such segments, four points need to be
37 * specified each on the Luma axis and the per plane Sigma axis. On the Luma
38 * axis two points are fixed (namely 0 and maximum luma value - depending on
39 * ISP bit depth). The other two points are the points where the slope may
40 * change its value. These two points are called knee points. The four points on
41 * the per plane sigma axis are also specified at the interface.
42 * 2. One rounding adjustment parameter for each plane
43 * 3. One maximum feedback threshold value for each plane
44 * 4. Selection of the reference frame buffer to be used for noise reduction.
45 */
46struct ia_css_tnr3_kernel_config {
47	unsigned int maxfb_y;                        /** Maximum Feedback Gain for Y */
48	unsigned int maxfb_u;                        /** Maximum Feedback Gain for U */
49	unsigned int maxfb_v;                        /** Maximum Feedback Gain for V */
50	unsigned int round_adj_y;                    /** Rounding Adjust for Y */
51	unsigned int round_adj_u;                    /** Rounding Adjust for U */
52	unsigned int round_adj_v;                    /** Rounding Adjust for V */
53	unsigned int knee_y[TNR3_NUM_SEGMENTS - 1];  /** Knee points */
54	unsigned int sigma_y[TNR3_NUM_SEGMENTS +
55					       1]; /** Standard deviation for Y at points Y0, Y1, Y2, Y3 */
56	unsigned int sigma_u[TNR3_NUM_SEGMENTS +
57					       1]; /** Standard deviation for U at points U0, U1, U2, U3 */
58	unsigned int sigma_v[TNR3_NUM_SEGMENTS +
59					       1]; /** Standard deviation for V at points V0, V1, V2, V3 */
60	unsigned int
61	ref_buf_select;                 /** Selection of the reference buffer */
62};
63
64#endif
65