omapfb/dss/dispc_coefs.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * linux/drivers/video/omap2/dss/dispc_coefs.c
0004  *
0005  * Copyright (C) 2011 Texas Instruments
0006  * Author: Chandrabhanu Mahapatra <cmahapatra@ti.com>
0007  */
0008
0009 #include <linux/kernel.h>
0010 #include <video/omapfb_dss.h>
0011
0012 #include "dispc.h"
0013
0014 static const struct dispc_coef coef3_M8[8] = {
0015     { 0,  0, 128,  0, 0 },
0016     { 0, -4, 123,  9, 0 },
0017     { 0, -4, 108, 24, 0 },
0018     { 0, -2,  87, 43, 0 },
0019     { 0, 64,  64,  0, 0 },
0020     { 0, 43,  87, -2, 0 },
0021     { 0, 24, 108, -4, 0 },
0022     { 0,  9, 123, -4, 0 },
0023 };
0024
0025 static const struct dispc_coef coef3_M9[8] = {
0026     { 0,  6, 116,  6, 0 },
0027     { 0,  0, 112, 16, 0 },
0028     { 0, -2, 100, 30, 0 },
0029     { 0, -2,  83, 47, 0 },
0030     { 0, 64,  64,  0, 0 },
0031     { 0, 47,  83, -2, 0 },
0032     { 0, 30, 100, -2, 0 },
0033     { 0, 16, 112,  0, 0 },
0034 };
0035
0036 static const struct dispc_coef coef3_M10[8] = {
0037     { 0, 10, 108, 10, 0 },
0038     { 0,  3, 104, 21, 0 },
0039     { 0,  0,  94, 34, 0 },
0040     { 0, -1,  80, 49, 0 },
0041     { 0, 64,  64,  0, 0 },
0042     { 0, 49,  80, -1, 0 },
0043     { 0, 34,  94,  0, 0 },
0044     { 0, 21, 104,  3, 0 },
0045 };
0046
0047 static const struct dispc_coef coef3_M11[8] = {
0048     { 0, 14, 100, 14, 0 },
0049     { 0,  6,  98, 24, 0 },
0050     { 0,  2,  90, 36, 0 },
0051     { 0,  0,  78, 50, 0 },
0052     { 0, 64,  64,  0, 0 },
0053     { 0, 50,  78,  0, 0 },
0054     { 0, 36,  90,  2, 0 },
0055     { 0, 24,  98,  6, 0 },
0056 };
0057
0058 static const struct dispc_coef coef3_M12[8] = {
0059     { 0, 16,  96, 16, 0 },
0060     { 0,  9,  93, 26, 0 },
0061     { 0,  4,  86, 38, 0 },
0062     { 0,  1,  76, 51, 0 },
0063     { 0, 64,  64,  0, 0 },
0064     { 0, 51,  76,  1, 0 },
0065     { 0, 38,  86,  4, 0 },
0066     { 0, 26,  93,  9, 0 },
0067 };
0068
0069 static const struct dispc_coef coef3_M13[8] = {
0070     { 0, 18,  92, 18, 0 },
0071     { 0, 10,  90, 28, 0 },
0072     { 0,  5,  83, 40, 0 },
0073     { 0,  1,  75, 52, 0 },
0074     { 0, 64,  64,  0, 0 },
0075     { 0, 52,  75,  1, 0 },
0076     { 0, 40,  83,  5, 0 },
0077     { 0, 28,  90, 10, 0 },
0078 };
0079
0080 static const struct dispc_coef coef3_M14[8] = {
0081     { 0, 20, 88, 20, 0 },
0082     { 0, 12, 86, 30, 0 },
0083     { 0,  6, 81, 41, 0 },
0084     { 0,  2, 74, 52, 0 },
0085     { 0, 64, 64,  0, 0 },
0086     { 0, 52, 74,  2, 0 },
0087     { 0, 41, 81,  6, 0 },
0088     { 0, 30, 86, 12, 0 },
0089 };
0090
0091 static const struct dispc_coef coef3_M16[8] = {
0092     { 0, 22, 84, 22, 0 },
0093     { 0, 14, 82, 32, 0 },
0094     { 0,  8, 78, 42, 0 },
0095     { 0,  3, 72, 53, 0 },
0096     { 0, 64, 64,  0, 0 },
0097     { 0, 53, 72,  3, 0 },
0098     { 0, 42, 78,  8, 0 },
0099     { 0, 32, 82, 14, 0 },
0100 };
0101
0102 static const struct dispc_coef coef3_M19[8] = {
0103     { 0, 24, 80, 24, 0 },
0104     { 0, 16, 79, 33, 0 },
0105     { 0,  9, 76, 43, 0 },
0106     { 0,  4, 70, 54, 0 },
0107     { 0, 64, 64,  0, 0 },
0108     { 0, 54, 70,  4, 0 },
0109     { 0, 43, 76,  9, 0 },
0110     { 0, 33, 79, 16, 0 },
0111 };
0112
0113 static const struct dispc_coef coef3_M22[8] = {
0114     { 0, 25, 78, 25, 0 },
0115     { 0, 17, 77, 34, 0 },
0116     { 0, 10, 74, 44, 0 },
0117     { 0,  5, 69, 54, 0 },
0118     { 0, 64, 64,  0, 0 },
0119     { 0, 54, 69,  5, 0 },
0120     { 0, 44, 74, 10, 0 },
0121     { 0, 34, 77, 17, 0 },
0122 };
0123
0124 static const struct dispc_coef coef3_M26[8] = {
0125     { 0, 26, 76, 26, 0 },
0126     { 0, 19, 74, 35, 0 },
0127     { 0, 11, 72, 45, 0 },
0128     { 0,  5, 69, 54, 0 },
0129     { 0, 64, 64,  0, 0 },
0130     { 0, 54, 69,  5, 0 },
0131     { 0, 45, 72, 11, 0 },
0132     { 0, 35, 74, 19, 0 },
0133 };
0134
0135 static const struct dispc_coef coef3_M32[8] = {
0136     { 0, 27, 74, 27, 0 },
0137     { 0, 19, 73, 36, 0 },
0138     { 0, 12, 71, 45, 0 },
0139     { 0,  6, 68, 54, 0 },
0140     { 0, 64, 64,  0, 0 },
0141     { 0, 54, 68,  6, 0 },
0142     { 0, 45, 71, 12, 0 },
0143     { 0, 36, 73, 19, 0 },
0144 };
0145
0146 static const struct dispc_coef coef5_M8[8] = {
0147     {   0,   0, 128,   0,   0 },
0148     {  -2,  14, 125, -10,   1 },
0149     {  -6,  33, 114, -15,   2 },
0150     { -10,  55,  98, -16,   1 },
0151     {   0, -14,  78,  78, -14 },
0152     {   1, -16,  98,  55, -10 },
0153     {   2, -15, 114,  33,  -6 },
0154     {   1, -10, 125,  14,  -2 },
0155 };
0156
0157 static const struct dispc_coef coef5_M9[8] = {
0158     {  -3,  10, 114,  10,  -3 },
0159     {  -6,  24, 111,   0,  -1 },
0160     {  -8,  40, 103,  -7,   0 },
0161     { -11,  58,  91, -11,   1 },
0162     {   0, -12,  76,  76, -12 },
0163     {   1, -11,  91,  58, -11 },
0164     {   0,  -7, 103,  40,  -8 },
0165     {  -1,   0, 111,  24,  -6 },
0166 };
0167
0168 static const struct dispc_coef coef5_M10[8] = {
0169     {  -4,  18, 100,  18,  -4 },
0170     {  -6,  30,  99,   8,  -3 },
0171     {  -8,  44,  93,   0,  -1 },
0172     {  -9,  58,  84,  -5,   0 },
0173     {   0,  -8,  72,  72,  -8 },
0174     {   0,  -5,  84,  58,  -9 },
0175     {  -1,   0,  93,  44,  -8 },
0176     {  -3,   8,  99,  30,  -6 },
0177 };
0178
0179 static const struct dispc_coef coef5_M11[8] = {
0180     {  -5,  23,  92,  23,  -5 },
0181     {  -6,  34,  90,  13,  -3 },
0182     {  -6,  45,  85,   6,  -2 },
0183     {  -6,  57,  78,   0,  -1 },
0184     {   0,  -4,  68,  68,  -4 },
0185     {  -1,   0,  78,  57,  -6 },
0186     {  -2,   6,  85,  45,  -6 },
0187     {  -3,  13,  90,  34,  -6 },
0188 };
0189
0190 static const struct dispc_coef coef5_M12[8] = {
0191     {  -4,  26,  84,  26,  -4 },
0192     {  -5,  36,  82,  18,  -3 },
0193     {  -4,  46,  78,  10,  -2 },
0194     {  -3,  55,  72,   5,  -1 },
0195     {   0,   0,  64,  64,   0 },
0196     {  -1,   5,  72,  55,  -3 },
0197     {  -2,  10,  78,  46,  -4 },
0198     {  -3,  18,  82,  36,  -5 },
0199 };
0200
0201 static const struct dispc_coef coef5_M13[8] = {
0202     {  -3,  28,  78,  28,  -3 },
0203     {  -3,  37,  76,  21,  -3 },
0204     {  -2,  45,  73,  14,  -2 },
0205     {   0,  53,  68,   8,  -1 },
0206     {   0,   3,  61,  61,   3 },
0207     {  -1,   8,  68,  53,   0 },
0208     {  -2,  14,  73,  45,  -2 },
0209     {  -3,  21,  76,  37,  -3 },
0210 };
0211
0212 static const struct dispc_coef coef5_M14[8] = {
0213     {  -2,  30,  72,  30,  -2 },
0214     {  -1,  37,  71,  23,  -2 },
0215     {   0,  45,  69,  16,  -2 },
0216     {   3,  52,  64,  10,  -1 },
0217     {   0,   6,  58,  58,   6 },
0218     {  -1,  10,  64,  52,   3 },
0219     {  -2,  16,  69,  45,   0 },
0220     {  -2,  23,  71,  37,  -1 },
0221 };
0222
0223 static const struct dispc_coef coef5_M16[8] = {
0224     {   0,  31,  66,  31,   0 },
0225     {   1,  38,  65,  25,  -1 },
0226     {   3,  44,  62,  20,  -1 },
0227     {   6,  49,  59,  14,   0 },
0228     {   0,  10,  54,  54,  10 },
0229     {   0,  14,  59,  49,   6 },
0230     {  -1,  20,  62,  44,   3 },
0231     {  -1,  25,  65,  38,   1 },
0232 };
0233
0234 static const struct dispc_coef coef5_M19[8] = {
0235     {   3,  32,  58,  32,   3 },
0236     {   4,  38,  58,  27,   1 },
0237     {   7,  42,  55,  23,   1 },
0238     {  10,  46,  54,  18,   0 },
0239     {   0,  14,  50,  50,  14 },
0240     {   0,  18,  54,  46,  10 },
0241     {   1,  23,  55,  42,   7 },
0242     {   1,  27,  58,  38,   4 },
0243 };
0244
0245 static const struct dispc_coef coef5_M22[8] = {
0246     {   4,  33,  54,  33,   4 },
0247     {   6,  37,  54,  28,   3 },
0248     {   9,  41,  53,  24,   1 },
0249     {  12,  45,  51,  20,   0 },
0250     {   0,  16,  48,  48,  16 },
0251     {   0,  20,  51,  45,  12 },
0252     {   1,  24,  53,  41,   9 },
0253     {   3,  28,  54,  37,   6 },
0254 };
0255
0256 static const struct dispc_coef coef5_M26[8] = {
0257     {   6,  33,  50,  33,   6 },
0258     {   8,  36,  51,  29,   4 },
0259     {  11,  40,  50,  25,   2 },
0260     {  14,  43,  48,  22,   1 },
0261     {   0,  18,  46,  46,  18 },
0262     {   1,  22,  48,  43,  14 },
0263     {   2,  25,  50,  40,  11 },
0264     {   4,  29,  51,  36,   8 },
0265 };
0266
0267 static const struct dispc_coef coef5_M32[8] = {
0268     {   7,  33,  48,  33,   7 },
0269     {  10,  36,  48,  29,   5 },
0270     {  13,  39,  47,  26,   3 },
0271     {  16,  42,  46,  23,   1 },
0272     {   0,  19,  45,  45,  19 },
0273     {   1,  23,  46,  42,  16 },
0274     {   3,  26,  47,  39,  13 },
0275     {   5,  29,  48,  36,  10 },
0276 };
0277
0278 const struct dispc_coef *dispc_ovl_get_scale_coef(int inc, int five_taps)
0279 {
0280     int i;
0281     static const struct {
0282         int Mmin;
0283         int Mmax;
0284         const struct dispc_coef *coef_3;
0285         const struct dispc_coef *coef_5;
0286     } coefs[] = {
0287         { 27, 32, coef3_M32, coef5_M32 },
0288         { 23, 26, coef3_M26, coef5_M26 },
0289         { 20, 22, coef3_M22, coef5_M22 },
0290         { 17, 19, coef3_M19, coef5_M19 },
0291         { 15, 16, coef3_M16, coef5_M16 },
0292         { 14, 14, coef3_M14, coef5_M14 },
0293         { 13, 13, coef3_M13, coef5_M13 },
0294         { 12, 12, coef3_M12, coef5_M12 },
0295         { 11, 11, coef3_M11, coef5_M11 },
0296         { 10, 10, coef3_M10, coef5_M10 },
0297         {  9,  9,  coef3_M9,  coef5_M9 },
0298         {  4,  8,  coef3_M8,  coef5_M8 },
0299         /*
0300          * When upscaling more than two times, blockiness and outlines
0301          * around the image are observed when M8 tables are used. M11,
0302          * M16 and M19 tables are used to prevent this.
0303          */
0304         {  3,  3, coef3_M11, coef5_M11 },
0305         {  2,  2, coef3_M16, coef5_M16 },
0306         {  0,  1, coef3_M19, coef5_M19 },
0307     };
0308
0309     inc /= 128;
0310     for (i = 0; i < ARRAY_SIZE(coefs); ++i)
0311         if (inc >= coefs[i].Mmin && inc <= coefs[i].Mmax)
0312             return five_taps ? coefs[i].coef_5 : coefs[i].coef_3;
0313     return NULL;
0314 }