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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/4 * Author: Chandrabhanu Mahapatra <cmahapatra@ti.com>5 */6 7#include <linux/kernel.h>8 9#include "omapdss.h"10#include "dispc.h"11 12static const struct dispc_coef coef3_M8[8] = {13 { 0, 0, 128, 0, 0 },14 { 0, -4, 123, 9, 0 },15 { 0, -4, 108, 24, 0 },16 { 0, -2, 87, 43, 0 },17 { 0, 64, 64, 0, 0 },18 { 0, 43, 87, -2, 0 },19 { 0, 24, 108, -4, 0 },20 { 0, 9, 123, -4, 0 },21};22 23static const struct dispc_coef coef3_M9[8] = {24 { 0, 6, 116, 6, 0 },25 { 0, 0, 112, 16, 0 },26 { 0, -2, 100, 30, 0 },27 { 0, -2, 83, 47, 0 },28 { 0, 64, 64, 0, 0 },29 { 0, 47, 83, -2, 0 },30 { 0, 30, 100, -2, 0 },31 { 0, 16, 112, 0, 0 },32};33 34static const struct dispc_coef coef3_M10[8] = {35 { 0, 10, 108, 10, 0 },36 { 0, 3, 104, 21, 0 },37 { 0, 0, 94, 34, 0 },38 { 0, -1, 80, 49, 0 },39 { 0, 64, 64, 0, 0 },40 { 0, 49, 80, -1, 0 },41 { 0, 34, 94, 0, 0 },42 { 0, 21, 104, 3, 0 },43};44 45static const struct dispc_coef coef3_M11[8] = {46 { 0, 14, 100, 14, 0 },47 { 0, 6, 98, 24, 0 },48 { 0, 2, 90, 36, 0 },49 { 0, 0, 78, 50, 0 },50 { 0, 64, 64, 0, 0 },51 { 0, 50, 78, 0, 0 },52 { 0, 36, 90, 2, 0 },53 { 0, 24, 98, 6, 0 },54};55 56static const struct dispc_coef coef3_M12[8] = {57 { 0, 16, 96, 16, 0 },58 { 0, 9, 93, 26, 0 },59 { 0, 4, 86, 38, 0 },60 { 0, 1, 76, 51, 0 },61 { 0, 64, 64, 0, 0 },62 { 0, 51, 76, 1, 0 },63 { 0, 38, 86, 4, 0 },64 { 0, 26, 93, 9, 0 },65};66 67static const struct dispc_coef coef3_M13[8] = {68 { 0, 18, 92, 18, 0 },69 { 0, 10, 90, 28, 0 },70 { 0, 5, 83, 40, 0 },71 { 0, 1, 75, 52, 0 },72 { 0, 64, 64, 0, 0 },73 { 0, 52, 75, 1, 0 },74 { 0, 40, 83, 5, 0 },75 { 0, 28, 90, 10, 0 },76};77 78static const struct dispc_coef coef3_M14[8] = {79 { 0, 20, 88, 20, 0 },80 { 0, 12, 86, 30, 0 },81 { 0, 6, 81, 41, 0 },82 { 0, 2, 74, 52, 0 },83 { 0, 64, 64, 0, 0 },84 { 0, 52, 74, 2, 0 },85 { 0, 41, 81, 6, 0 },86 { 0, 30, 86, 12, 0 },87};88 89static const struct dispc_coef coef3_M16[8] = {90 { 0, 22, 84, 22, 0 },91 { 0, 14, 82, 32, 0 },92 { 0, 8, 78, 42, 0 },93 { 0, 3, 72, 53, 0 },94 { 0, 64, 64, 0, 0 },95 { 0, 53, 72, 3, 0 },96 { 0, 42, 78, 8, 0 },97 { 0, 32, 82, 14, 0 },98};99 100static const struct dispc_coef coef3_M19[8] = {101 { 0, 24, 80, 24, 0 },102 { 0, 16, 79, 33, 0 },103 { 0, 9, 76, 43, 0 },104 { 0, 4, 70, 54, 0 },105 { 0, 64, 64, 0, 0 },106 { 0, 54, 70, 4, 0 },107 { 0, 43, 76, 9, 0 },108 { 0, 33, 79, 16, 0 },109};110 111static const struct dispc_coef coef3_M22[8] = {112 { 0, 25, 78, 25, 0 },113 { 0, 17, 77, 34, 0 },114 { 0, 10, 74, 44, 0 },115 { 0, 5, 69, 54, 0 },116 { 0, 64, 64, 0, 0 },117 { 0, 54, 69, 5, 0 },118 { 0, 44, 74, 10, 0 },119 { 0, 34, 77, 17, 0 },120};121 122static const struct dispc_coef coef3_M26[8] = {123 { 0, 26, 76, 26, 0 },124 { 0, 19, 74, 35, 0 },125 { 0, 11, 72, 45, 0 },126 { 0, 5, 69, 54, 0 },127 { 0, 64, 64, 0, 0 },128 { 0, 54, 69, 5, 0 },129 { 0, 45, 72, 11, 0 },130 { 0, 35, 74, 19, 0 },131};132 133static const struct dispc_coef coef3_M32[8] = {134 { 0, 27, 74, 27, 0 },135 { 0, 19, 73, 36, 0 },136 { 0, 12, 71, 45, 0 },137 { 0, 6, 68, 54, 0 },138 { 0, 64, 64, 0, 0 },139 { 0, 54, 68, 6, 0 },140 { 0, 45, 71, 12, 0 },141 { 0, 36, 73, 19, 0 },142};143 144static const struct dispc_coef coef5_M8[8] = {145 { 0, 0, 128, 0, 0 },146 { -2, 14, 125, -10, 1 },147 { -6, 33, 114, -15, 2 },148 { -10, 55, 98, -16, 1 },149 { 0, -14, 78, 78, -14 },150 { 1, -16, 98, 55, -10 },151 { 2, -15, 114, 33, -6 },152 { 1, -10, 125, 14, -2 },153};154 155static const struct dispc_coef coef5_M9[8] = {156 { -3, 10, 114, 10, -3 },157 { -6, 24, 111, 0, -1 },158 { -8, 40, 103, -7, 0 },159 { -11, 58, 91, -11, 1 },160 { 0, -12, 76, 76, -12 },161 { 1, -11, 91, 58, -11 },162 { 0, -7, 103, 40, -8 },163 { -1, 0, 111, 24, -6 },164};165 166static const struct dispc_coef coef5_M10[8] = {167 { -4, 18, 100, 18, -4 },168 { -6, 30, 99, 8, -3 },169 { -8, 44, 93, 0, -1 },170 { -9, 58, 84, -5, 0 },171 { 0, -8, 72, 72, -8 },172 { 0, -5, 84, 58, -9 },173 { -1, 0, 93, 44, -8 },174 { -3, 8, 99, 30, -6 },175};176 177static const struct dispc_coef coef5_M11[8] = {178 { -5, 23, 92, 23, -5 },179 { -6, 34, 90, 13, -3 },180 { -6, 45, 85, 6, -2 },181 { -6, 57, 78, 0, -1 },182 { 0, -4, 68, 68, -4 },183 { -1, 0, 78, 57, -6 },184 { -2, 6, 85, 45, -6 },185 { -3, 13, 90, 34, -6 },186};187 188static const struct dispc_coef coef5_M12[8] = {189 { -4, 26, 84, 26, -4 },190 { -5, 36, 82, 18, -3 },191 { -4, 46, 78, 10, -2 },192 { -3, 55, 72, 5, -1 },193 { 0, 0, 64, 64, 0 },194 { -1, 5, 72, 55, -3 },195 { -2, 10, 78, 46, -4 },196 { -3, 18, 82, 36, -5 },197};198 199static const struct dispc_coef coef5_M13[8] = {200 { -3, 28, 78, 28, -3 },201 { -3, 37, 76, 21, -3 },202 { -2, 45, 73, 14, -2 },203 { 0, 53, 68, 8, -1 },204 { 0, 3, 61, 61, 3 },205 { -1, 8, 68, 53, 0 },206 { -2, 14, 73, 45, -2 },207 { -3, 21, 76, 37, -3 },208};209 210static const struct dispc_coef coef5_M14[8] = {211 { -2, 30, 72, 30, -2 },212 { -1, 37, 71, 23, -2 },213 { 0, 45, 69, 16, -2 },214 { 3, 52, 64, 10, -1 },215 { 0, 6, 58, 58, 6 },216 { -1, 10, 64, 52, 3 },217 { -2, 16, 69, 45, 0 },218 { -2, 23, 71, 37, -1 },219};220 221static const struct dispc_coef coef5_M16[8] = {222 { 0, 31, 66, 31, 0 },223 { 1, 38, 65, 25, -1 },224 { 3, 44, 62, 20, -1 },225 { 6, 49, 59, 14, 0 },226 { 0, 10, 54, 54, 10 },227 { 0, 14, 59, 49, 6 },228 { -1, 20, 62, 44, 3 },229 { -1, 25, 65, 38, 1 },230};231 232static const struct dispc_coef coef5_M19[8] = {233 { 3, 32, 58, 32, 3 },234 { 4, 38, 58, 27, 1 },235 { 7, 42, 55, 23, 1 },236 { 10, 46, 54, 18, 0 },237 { 0, 14, 50, 50, 14 },238 { 0, 18, 54, 46, 10 },239 { 1, 23, 55, 42, 7 },240 { 1, 27, 58, 38, 4 },241};242 243static const struct dispc_coef coef5_M22[8] = {244 { 4, 33, 54, 33, 4 },245 { 6, 37, 54, 28, 3 },246 { 9, 41, 53, 24, 1 },247 { 12, 45, 51, 20, 0 },248 { 0, 16, 48, 48, 16 },249 { 0, 20, 51, 45, 12 },250 { 1, 24, 53, 41, 9 },251 { 3, 28, 54, 37, 6 },252};253 254static const struct dispc_coef coef5_M26[8] = {255 { 6, 33, 50, 33, 6 },256 { 8, 36, 51, 29, 4 },257 { 11, 40, 50, 25, 2 },258 { 14, 43, 48, 22, 1 },259 { 0, 18, 46, 46, 18 },260 { 1, 22, 48, 43, 14 },261 { 2, 25, 50, 40, 11 },262 { 4, 29, 51, 36, 8 },263};264 265static const struct dispc_coef coef5_M32[8] = {266 { 7, 33, 48, 33, 7 },267 { 10, 36, 48, 29, 5 },268 { 13, 39, 47, 26, 3 },269 { 16, 42, 46, 23, 1 },270 { 0, 19, 45, 45, 19 },271 { 1, 23, 46, 42, 16 },272 { 3, 26, 47, 39, 13 },273 { 5, 29, 48, 36, 10 },274};275 276const struct dispc_coef *dispc_ovl_get_scale_coef(int inc, int five_taps)277{278 int i;279 static const struct {280 int Mmin;281 int Mmax;282 const struct dispc_coef *coef_3;283 const struct dispc_coef *coef_5;284 } coefs[] = {285 { 27, 32, coef3_M32, coef5_M32 },286 { 23, 26, coef3_M26, coef5_M26 },287 { 20, 22, coef3_M22, coef5_M22 },288 { 17, 19, coef3_M19, coef5_M19 },289 { 15, 16, coef3_M16, coef5_M16 },290 { 14, 14, coef3_M14, coef5_M14 },291 { 13, 13, coef3_M13, coef5_M13 },292 { 12, 12, coef3_M12, coef5_M12 },293 { 11, 11, coef3_M11, coef5_M11 },294 { 10, 10, coef3_M10, coef5_M10 },295 { 9, 9, coef3_M9, coef5_M9 },296 { 4, 8, coef3_M8, coef5_M8 },297 /*298 * When upscaling more than two times, blockiness and outlines299 * around the image are observed when M8 tables are used. M11,300 * M16 and M19 tables are used to prevent this.301 */302 { 3, 3, coef3_M11, coef5_M11 },303 { 2, 2, coef3_M16, coef5_M16 },304 { 0, 1, coef3_M19, coef5_M19 },305 };306 307 inc /= 128;308 for (i = 0; i < ARRAY_SIZE(coefs); ++i)309 if (inc >= coefs[i].Mmin && inc <= coefs[i].Mmax)310 return five_taps ? coefs[i].coef_5 : coefs[i].coef_3;311 return NULL;312}313