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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/video/omap2/dss/dispc_coefs.c4 *5 * Copyright (C) 2011 Texas Instruments6 * Author: Chandrabhanu Mahapatra <cmahapatra@ti.com>7 */8 9#include <linux/kernel.h>10#include <video/omapfb_dss.h>11 12#include "dispc.h"13 14static const struct dispc_coef coef3_M8[8] = {15 { 0, 0, 128, 0, 0 },16 { 0, -4, 123, 9, 0 },17 { 0, -4, 108, 24, 0 },18 { 0, -2, 87, 43, 0 },19 { 0, 64, 64, 0, 0 },20 { 0, 43, 87, -2, 0 },21 { 0, 24, 108, -4, 0 },22 { 0, 9, 123, -4, 0 },23};24 25static const struct dispc_coef coef3_M9[8] = {26 { 0, 6, 116, 6, 0 },27 { 0, 0, 112, 16, 0 },28 { 0, -2, 100, 30, 0 },29 { 0, -2, 83, 47, 0 },30 { 0, 64, 64, 0, 0 },31 { 0, 47, 83, -2, 0 },32 { 0, 30, 100, -2, 0 },33 { 0, 16, 112, 0, 0 },34};35 36static const struct dispc_coef coef3_M10[8] = {37 { 0, 10, 108, 10, 0 },38 { 0, 3, 104, 21, 0 },39 { 0, 0, 94, 34, 0 },40 { 0, -1, 80, 49, 0 },41 { 0, 64, 64, 0, 0 },42 { 0, 49, 80, -1, 0 },43 { 0, 34, 94, 0, 0 },44 { 0, 21, 104, 3, 0 },45};46 47static const struct dispc_coef coef3_M11[8] = {48 { 0, 14, 100, 14, 0 },49 { 0, 6, 98, 24, 0 },50 { 0, 2, 90, 36, 0 },51 { 0, 0, 78, 50, 0 },52 { 0, 64, 64, 0, 0 },53 { 0, 50, 78, 0, 0 },54 { 0, 36, 90, 2, 0 },55 { 0, 24, 98, 6, 0 },56};57 58static const struct dispc_coef coef3_M12[8] = {59 { 0, 16, 96, 16, 0 },60 { 0, 9, 93, 26, 0 },61 { 0, 4, 86, 38, 0 },62 { 0, 1, 76, 51, 0 },63 { 0, 64, 64, 0, 0 },64 { 0, 51, 76, 1, 0 },65 { 0, 38, 86, 4, 0 },66 { 0, 26, 93, 9, 0 },67};68 69static const struct dispc_coef coef3_M13[8] = {70 { 0, 18, 92, 18, 0 },71 { 0, 10, 90, 28, 0 },72 { 0, 5, 83, 40, 0 },73 { 0, 1, 75, 52, 0 },74 { 0, 64, 64, 0, 0 },75 { 0, 52, 75, 1, 0 },76 { 0, 40, 83, 5, 0 },77 { 0, 28, 90, 10, 0 },78};79 80static const struct dispc_coef coef3_M14[8] = {81 { 0, 20, 88, 20, 0 },82 { 0, 12, 86, 30, 0 },83 { 0, 6, 81, 41, 0 },84 { 0, 2, 74, 52, 0 },85 { 0, 64, 64, 0, 0 },86 { 0, 52, 74, 2, 0 },87 { 0, 41, 81, 6, 0 },88 { 0, 30, 86, 12, 0 },89};90 91static const struct dispc_coef coef3_M16[8] = {92 { 0, 22, 84, 22, 0 },93 { 0, 14, 82, 32, 0 },94 { 0, 8, 78, 42, 0 },95 { 0, 3, 72, 53, 0 },96 { 0, 64, 64, 0, 0 },97 { 0, 53, 72, 3, 0 },98 { 0, 42, 78, 8, 0 },99 { 0, 32, 82, 14, 0 },100};101 102static const struct dispc_coef coef3_M19[8] = {103 { 0, 24, 80, 24, 0 },104 { 0, 16, 79, 33, 0 },105 { 0, 9, 76, 43, 0 },106 { 0, 4, 70, 54, 0 },107 { 0, 64, 64, 0, 0 },108 { 0, 54, 70, 4, 0 },109 { 0, 43, 76, 9, 0 },110 { 0, 33, 79, 16, 0 },111};112 113static const struct dispc_coef coef3_M22[8] = {114 { 0, 25, 78, 25, 0 },115 { 0, 17, 77, 34, 0 },116 { 0, 10, 74, 44, 0 },117 { 0, 5, 69, 54, 0 },118 { 0, 64, 64, 0, 0 },119 { 0, 54, 69, 5, 0 },120 { 0, 44, 74, 10, 0 },121 { 0, 34, 77, 17, 0 },122};123 124static const struct dispc_coef coef3_M26[8] = {125 { 0, 26, 76, 26, 0 },126 { 0, 19, 74, 35, 0 },127 { 0, 11, 72, 45, 0 },128 { 0, 5, 69, 54, 0 },129 { 0, 64, 64, 0, 0 },130 { 0, 54, 69, 5, 0 },131 { 0, 45, 72, 11, 0 },132 { 0, 35, 74, 19, 0 },133};134 135static const struct dispc_coef coef3_M32[8] = {136 { 0, 27, 74, 27, 0 },137 { 0, 19, 73, 36, 0 },138 { 0, 12, 71, 45, 0 },139 { 0, 6, 68, 54, 0 },140 { 0, 64, 64, 0, 0 },141 { 0, 54, 68, 6, 0 },142 { 0, 45, 71, 12, 0 },143 { 0, 36, 73, 19, 0 },144};145 146static const struct dispc_coef coef5_M8[8] = {147 { 0, 0, 128, 0, 0 },148 { -2, 14, 125, -10, 1 },149 { -6, 33, 114, -15, 2 },150 { -10, 55, 98, -16, 1 },151 { 0, -14, 78, 78, -14 },152 { 1, -16, 98, 55, -10 },153 { 2, -15, 114, 33, -6 },154 { 1, -10, 125, 14, -2 },155};156 157static const struct dispc_coef coef5_M9[8] = {158 { -3, 10, 114, 10, -3 },159 { -6, 24, 111, 0, -1 },160 { -8, 40, 103, -7, 0 },161 { -11, 58, 91, -11, 1 },162 { 0, -12, 76, 76, -12 },163 { 1, -11, 91, 58, -11 },164 { 0, -7, 103, 40, -8 },165 { -1, 0, 111, 24, -6 },166};167 168static const struct dispc_coef coef5_M10[8] = {169 { -4, 18, 100, 18, -4 },170 { -6, 30, 99, 8, -3 },171 { -8, 44, 93, 0, -1 },172 { -9, 58, 84, -5, 0 },173 { 0, -8, 72, 72, -8 },174 { 0, -5, 84, 58, -9 },175 { -1, 0, 93, 44, -8 },176 { -3, 8, 99, 30, -6 },177};178 179static const struct dispc_coef coef5_M11[8] = {180 { -5, 23, 92, 23, -5 },181 { -6, 34, 90, 13, -3 },182 { -6, 45, 85, 6, -2 },183 { -6, 57, 78, 0, -1 },184 { 0, -4, 68, 68, -4 },185 { -1, 0, 78, 57, -6 },186 { -2, 6, 85, 45, -6 },187 { -3, 13, 90, 34, -6 },188};189 190static const struct dispc_coef coef5_M12[8] = {191 { -4, 26, 84, 26, -4 },192 { -5, 36, 82, 18, -3 },193 { -4, 46, 78, 10, -2 },194 { -3, 55, 72, 5, -1 },195 { 0, 0, 64, 64, 0 },196 { -1, 5, 72, 55, -3 },197 { -2, 10, 78, 46, -4 },198 { -3, 18, 82, 36, -5 },199};200 201static const struct dispc_coef coef5_M13[8] = {202 { -3, 28, 78, 28, -3 },203 { -3, 37, 76, 21, -3 },204 { -2, 45, 73, 14, -2 },205 { 0, 53, 68, 8, -1 },206 { 0, 3, 61, 61, 3 },207 { -1, 8, 68, 53, 0 },208 { -2, 14, 73, 45, -2 },209 { -3, 21, 76, 37, -3 },210};211 212static const struct dispc_coef coef5_M14[8] = {213 { -2, 30, 72, 30, -2 },214 { -1, 37, 71, 23, -2 },215 { 0, 45, 69, 16, -2 },216 { 3, 52, 64, 10, -1 },217 { 0, 6, 58, 58, 6 },218 { -1, 10, 64, 52, 3 },219 { -2, 16, 69, 45, 0 },220 { -2, 23, 71, 37, -1 },221};222 223static const struct dispc_coef coef5_M16[8] = {224 { 0, 31, 66, 31, 0 },225 { 1, 38, 65, 25, -1 },226 { 3, 44, 62, 20, -1 },227 { 6, 49, 59, 14, 0 },228 { 0, 10, 54, 54, 10 },229 { 0, 14, 59, 49, 6 },230 { -1, 20, 62, 44, 3 },231 { -1, 25, 65, 38, 1 },232};233 234static const struct dispc_coef coef5_M19[8] = {235 { 3, 32, 58, 32, 3 },236 { 4, 38, 58, 27, 1 },237 { 7, 42, 55, 23, 1 },238 { 10, 46, 54, 18, 0 },239 { 0, 14, 50, 50, 14 },240 { 0, 18, 54, 46, 10 },241 { 1, 23, 55, 42, 7 },242 { 1, 27, 58, 38, 4 },243};244 245static const struct dispc_coef coef5_M22[8] = {246 { 4, 33, 54, 33, 4 },247 { 6, 37, 54, 28, 3 },248 { 9, 41, 53, 24, 1 },249 { 12, 45, 51, 20, 0 },250 { 0, 16, 48, 48, 16 },251 { 0, 20, 51, 45, 12 },252 { 1, 24, 53, 41, 9 },253 { 3, 28, 54, 37, 6 },254};255 256static const struct dispc_coef coef5_M26[8] = {257 { 6, 33, 50, 33, 6 },258 { 8, 36, 51, 29, 4 },259 { 11, 40, 50, 25, 2 },260 { 14, 43, 48, 22, 1 },261 { 0, 18, 46, 46, 18 },262 { 1, 22, 48, 43, 14 },263 { 2, 25, 50, 40, 11 },264 { 4, 29, 51, 36, 8 },265};266 267static const struct dispc_coef coef5_M32[8] = {268 { 7, 33, 48, 33, 7 },269 { 10, 36, 48, 29, 5 },270 { 13, 39, 47, 26, 3 },271 { 16, 42, 46, 23, 1 },272 { 0, 19, 45, 45, 19 },273 { 1, 23, 46, 42, 16 },274 { 3, 26, 47, 39, 13 },275 { 5, 29, 48, 36, 10 },276};277 278const struct dispc_coef *dispc_ovl_get_scale_coef(int inc, int five_taps)279{280 int i;281 static const struct {282 int Mmin;283 int Mmax;284 const struct dispc_coef *coef_3;285 const struct dispc_coef *coef_5;286 } coefs[] = {287 { 27, 32, coef3_M32, coef5_M32 },288 { 23, 26, coef3_M26, coef5_M26 },289 { 20, 22, coef3_M22, coef5_M22 },290 { 17, 19, coef3_M19, coef5_M19 },291 { 15, 16, coef3_M16, coef5_M16 },292 { 14, 14, coef3_M14, coef5_M14 },293 { 13, 13, coef3_M13, coef5_M13 },294 { 12, 12, coef3_M12, coef5_M12 },295 { 11, 11, coef3_M11, coef5_M11 },296 { 10, 10, coef3_M10, coef5_M10 },297 { 9, 9, coef3_M9, coef5_M9 },298 { 4, 8, coef3_M8, coef5_M8 },299 /*300 * When upscaling more than two times, blockiness and outlines301 * around the image are observed when M8 tables are used. M11,302 * M16 and M19 tables are used to prevent this.303 */304 { 3, 3, coef3_M11, coef5_M11 },305 { 2, 2, coef3_M16, coef5_M16 },306 { 0, 1, coef3_M19, coef5_M19 },307 };308 309 inc /= 128;310 for (i = 0; i < ARRAY_SIZE(coefs); ++i)311 if (inc >= coefs[i].Mmin && inc <= coefs[i].Mmax)312 return five_taps ? coefs[i].coef_5 : coefs[i].coef_3;313 return NULL;314}315