1 /* 2 * linux/drivers/video/omap2/dss/dispc_coefs.c 3 * 4 * Copyright (C) 2011 Texas Instruments 5 * Author: Chandrabhanu Mahapatra <cmahapatra@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <linux/kernel.h> 21 #include <video/omapdss.h> 22 23 #include "dispc.h" 24 25 static const struct dispc_coef coef3_M8[8] = { 26 { 0, 0, 128, 0, 0 }, 27 { 0, -4, 123, 9, 0 }, 28 { 0, -4, 108, 24, 0 }, 29 { 0, -2, 87, 43, 0 }, 30 { 0, 64, 64, 0, 0 }, 31 { 0, 43, 87, -2, 0 }, 32 { 0, 24, 108, -4, 0 }, 33 { 0, 9, 123, -4, 0 }, 34 }; 35 36 static const struct dispc_coef coef3_M9[8] = { 37 { 0, 6, 116, 6, 0 }, 38 { 0, 0, 112, 16, 0 }, 39 { 0, -2, 100, 30, 0 }, 40 { 0, -2, 83, 47, 0 }, 41 { 0, 64, 64, 0, 0 }, 42 { 0, 47, 83, -2, 0 }, 43 { 0, 30, 100, -2, 0 }, 44 { 0, 16, 112, 0, 0 }, 45 }; 46 47 static const struct dispc_coef coef3_M10[8] = { 48 { 0, 10, 108, 10, 0 }, 49 { 0, 3, 104, 21, 0 }, 50 { 0, 0, 94, 34, 0 }, 51 { 0, -1, 80, 49, 0 }, 52 { 0, 64, 64, 0, 0 }, 53 { 0, 49, 80, -1, 0 }, 54 { 0, 34, 94, 0, 0 }, 55 { 0, 21, 104, 3, 0 }, 56 }; 57 58 static const struct dispc_coef coef3_M11[8] = { 59 { 0, 14, 100, 14, 0 }, 60 { 0, 6, 98, 24, 0 }, 61 { 0, 2, 90, 36, 0 }, 62 { 0, 0, 78, 50, 0 }, 63 { 0, 64, 64, 0, 0 }, 64 { 0, 50, 78, 0, 0 }, 65 { 0, 36, 90, 2, 0 }, 66 { 0, 24, 98, 6, 0 }, 67 }; 68 69 static const struct dispc_coef coef3_M12[8] = { 70 { 0, 16, 96, 16, 0 }, 71 { 0, 9, 93, 26, 0 }, 72 { 0, 4, 86, 38, 0 }, 73 { 0, 1, 76, 51, 0 }, 74 { 0, 64, 64, 0, 0 }, 75 { 0, 51, 76, 1, 0 }, 76 { 0, 38, 86, 4, 0 }, 77 { 0, 26, 93, 9, 0 }, 78 }; 79 80 static const struct dispc_coef coef3_M13[8] = { 81 { 0, 18, 92, 18, 0 }, 82 { 0, 10, 90, 28, 0 }, 83 { 0, 5, 83, 40, 0 }, 84 { 0, 1, 75, 52, 0 }, 85 { 0, 64, 64, 0, 0 }, 86 { 0, 52, 75, 1, 0 }, 87 { 0, 40, 83, 5, 0 }, 88 { 0, 28, 90, 10, 0 }, 89 }; 90 91 static const struct dispc_coef coef3_M14[8] = { 92 { 0, 20, 88, 20, 0 }, 93 { 0, 12, 86, 30, 0 }, 94 { 0, 6, 81, 41, 0 }, 95 { 0, 2, 74, 52, 0 }, 96 { 0, 64, 64, 0, 0 }, 97 { 0, 52, 74, 2, 0 }, 98 { 0, 41, 81, 6, 0 }, 99 { 0, 30, 86, 12, 0 }, 100 }; 101 102 static const struct dispc_coef coef3_M16[8] = { 103 { 0, 22, 84, 22, 0 }, 104 { 0, 14, 82, 32, 0 }, 105 { 0, 8, 78, 42, 0 }, 106 { 0, 3, 72, 53, 0 }, 107 { 0, 64, 64, 0, 0 }, 108 { 0, 53, 72, 3, 0 }, 109 { 0, 42, 78, 8, 0 }, 110 { 0, 32, 82, 14, 0 }, 111 }; 112 113 static const struct dispc_coef coef3_M19[8] = { 114 { 0, 24, 80, 24, 0 }, 115 { 0, 16, 79, 33, 0 }, 116 { 0, 9, 76, 43, 0 }, 117 { 0, 4, 70, 54, 0 }, 118 { 0, 64, 64, 0, 0 }, 119 { 0, 54, 70, 4, 0 }, 120 { 0, 43, 76, 9, 0 }, 121 { 0, 33, 79, 16, 0 }, 122 }; 123 124 static const struct dispc_coef coef3_M22[8] = { 125 { 0, 25, 78, 25, 0 }, 126 { 0, 17, 77, 34, 0 }, 127 { 0, 10, 74, 44, 0 }, 128 { 0, 5, 69, 54, 0 }, 129 { 0, 64, 64, 0, 0 }, 130 { 0, 54, 69, 5, 0 }, 131 { 0, 44, 74, 10, 0 }, 132 { 0, 34, 77, 17, 0 }, 133 }; 134 135 static const struct dispc_coef coef3_M26[8] = { 136 { 0, 26, 76, 26, 0 }, 137 { 0, 19, 74, 35, 0 }, 138 { 0, 11, 72, 45, 0 }, 139 { 0, 5, 69, 54, 0 }, 140 { 0, 64, 64, 0, 0 }, 141 { 0, 54, 69, 5, 0 }, 142 { 0, 45, 72, 11, 0 }, 143 { 0, 35, 74, 19, 0 }, 144 }; 145 146 static const struct dispc_coef coef3_M32[8] = { 147 { 0, 27, 74, 27, 0 }, 148 { 0, 19, 73, 36, 0 }, 149 { 0, 12, 71, 45, 0 }, 150 { 0, 6, 68, 54, 0 }, 151 { 0, 64, 64, 0, 0 }, 152 { 0, 54, 68, 6, 0 }, 153 { 0, 45, 71, 12, 0 }, 154 { 0, 36, 73, 19, 0 }, 155 }; 156 157 static const struct dispc_coef coef5_M8[8] = { 158 { 0, 0, 128, 0, 0 }, 159 { -2, 14, 125, -10, 1 }, 160 { -6, 33, 114, -15, 2 }, 161 { -10, 55, 98, -16, 1 }, 162 { 0, -14, 78, 78, -14 }, 163 { 1, -16, 98, 55, -10 }, 164 { 2, -15, 114, 33, -6 }, 165 { 1, -10, 125, 14, -2 }, 166 }; 167 168 static const struct dispc_coef coef5_M9[8] = { 169 { -3, 10, 114, 10, -3 }, 170 { -6, 24, 111, 0, -1 }, 171 { -8, 40, 103, -7, 0 }, 172 { -11, 58, 91, -11, 1 }, 173 { 0, -12, 76, 76, -12 }, 174 { 1, -11, 91, 58, -11 }, 175 { 0, -7, 103, 40, -8 }, 176 { -1, 0, 111, 24, -6 }, 177 }; 178 179 static const struct dispc_coef coef5_M10[8] = { 180 { -4, 18, 100, 18, -4 }, 181 { -6, 30, 99, 8, -3 }, 182 { -8, 44, 93, 0, -1 }, 183 { -9, 58, 84, -5, 0 }, 184 { 0, -8, 72, 72, -8 }, 185 { 0, -5, 84, 58, -9 }, 186 { -1, 0, 93, 44, -8 }, 187 { -3, 8, 99, 30, -6 }, 188 }; 189 190 static const struct dispc_coef coef5_M11[8] = { 191 { -5, 23, 92, 23, -5 }, 192 { -6, 34, 90, 13, -3 }, 193 { -6, 45, 85, 6, -2 }, 194 { -6, 57, 78, 0, -1 }, 195 { 0, -4, 68, 68, -4 }, 196 { -1, 0, 78, 57, -6 }, 197 { -2, 6, 85, 45, -6 }, 198 { -3, 13, 90, 34, -6 }, 199 }; 200 201 static const struct dispc_coef coef5_M12[8] = { 202 { -4, 26, 84, 26, -4 }, 203 { -5, 36, 82, 18, -3 }, 204 { -4, 46, 78, 10, -2 }, 205 { -3, 55, 72, 5, -1 }, 206 { 0, 0, 64, 64, 0 }, 207 { -1, 5, 72, 55, -3 }, 208 { -2, 10, 78, 46, -4 }, 209 { -3, 18, 82, 36, -5 }, 210 }; 211 212 static const struct dispc_coef coef5_M13[8] = { 213 { -3, 28, 78, 28, -3 }, 214 { -3, 37, 76, 21, -3 }, 215 { -2, 45, 73, 14, -2 }, 216 { 0, 53, 68, 8, -1 }, 217 { 0, 3, 61, 61, 3 }, 218 { -1, 8, 68, 53, 0 }, 219 { -2, 14, 73, 45, -2 }, 220 { -3, 21, 76, 37, -3 }, 221 }; 222 223 static const struct dispc_coef coef5_M14[8] = { 224 { -2, 30, 72, 30, -2 }, 225 { -1, 37, 71, 23, -2 }, 226 { 0, 45, 69, 16, -2 }, 227 { 3, 52, 64, 10, -1 }, 228 { 0, 6, 58, 58, 6 }, 229 { -1, 10, 64, 52, 3 }, 230 { -2, 16, 69, 45, 0 }, 231 { -2, 23, 71, 37, -1 }, 232 }; 233 234 static const struct dispc_coef coef5_M16[8] = { 235 { 0, 31, 66, 31, 0 }, 236 { 1, 38, 65, 25, -1 }, 237 { 3, 44, 62, 20, -1 }, 238 { 6, 49, 59, 14, 0 }, 239 { 0, 10, 54, 54, 10 }, 240 { 0, 14, 59, 49, 6 }, 241 { -1, 20, 62, 44, 3 }, 242 { -1, 25, 65, 38, 1 }, 243 }; 244 245 static const struct dispc_coef coef5_M19[8] = { 246 { 3, 32, 58, 32, 3 }, 247 { 4, 38, 58, 27, 1 }, 248 { 7, 42, 55, 23, 1 }, 249 { 10, 46, 54, 18, 0 }, 250 { 0, 14, 50, 50, 14 }, 251 { 0, 18, 54, 46, 10 }, 252 { 1, 23, 55, 42, 7 }, 253 { 1, 27, 58, 38, 4 }, 254 }; 255 256 static const struct dispc_coef coef5_M22[8] = { 257 { 4, 33, 54, 33, 4 }, 258 { 6, 37, 54, 28, 3 }, 259 { 9, 41, 53, 24, 1 }, 260 { 12, 45, 51, 20, 0 }, 261 { 0, 16, 48, 48, 16 }, 262 { 0, 20, 51, 45, 12 }, 263 { 1, 24, 53, 41, 9 }, 264 { 3, 28, 54, 37, 6 }, 265 }; 266 267 static const struct dispc_coef coef5_M26[8] = { 268 { 6, 33, 50, 33, 6 }, 269 { 8, 36, 51, 29, 4 }, 270 { 11, 40, 50, 25, 2 }, 271 { 14, 43, 48, 22, 1 }, 272 { 0, 18, 46, 46, 18 }, 273 { 1, 22, 48, 43, 14 }, 274 { 2, 25, 50, 40, 11 }, 275 { 4, 29, 51, 36, 8 }, 276 }; 277 278 static const struct dispc_coef coef5_M32[8] = { 279 { 7, 33, 48, 33, 7 }, 280 { 10, 36, 48, 29, 5 }, 281 { 13, 39, 47, 26, 3 }, 282 { 16, 42, 46, 23, 1 }, 283 { 0, 19, 45, 45, 19 }, 284 { 1, 23, 46, 42, 16 }, 285 { 3, 26, 47, 39, 13 }, 286 { 5, 29, 48, 36, 10 }, 287 }; 288 289 const struct dispc_coef *dispc_ovl_get_scale_coef(int inc, int five_taps) 290 { 291 int i; 292 static const struct { 293 int Mmin; 294 int Mmax; 295 const struct dispc_coef *coef_3; 296 const struct dispc_coef *coef_5; 297 } coefs[] = { 298 { 27, 32, coef3_M32, coef5_M32 }, 299 { 23, 26, coef3_M26, coef5_M26 }, 300 { 20, 22, coef3_M22, coef5_M22 }, 301 { 17, 19, coef3_M19, coef5_M19 }, 302 { 15, 16, coef3_M16, coef5_M16 }, 303 { 14, 14, coef3_M14, coef5_M14 }, 304 { 13, 13, coef3_M13, coef5_M13 }, 305 { 12, 12, coef3_M12, coef5_M12 }, 306 { 11, 11, coef3_M11, coef5_M11 }, 307 { 10, 10, coef3_M10, coef5_M10 }, 308 { 9, 9, coef3_M9, coef5_M9 }, 309 { 4, 8, coef3_M8, coef5_M8 }, 310 /* 311 * When upscaling more than two times, blockiness and outlines 312 * around the image are observed when M8 tables are used. M11, 313 * M16 and M19 tables are used to prevent this. 314 */ 315 { 3, 3, coef3_M11, coef5_M11 }, 316 { 2, 2, coef3_M16, coef5_M16 }, 317 { 0, 1, coef3_M19, coef5_M19 }, 318 }; 319 320 inc /= 128; 321 for (i = 0; i < ARRAY_SIZE(coefs); ++i) 322 if (inc >= coefs[i].Mmin && inc <= coefs[i].Mmax) 323 return five_taps ? coefs[i].coef_5 : coefs[i].coef_3; 324 return NULL; 325 } 326