1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * v4l2-dv-timings - dv-timings helper functions 4 * 5 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/types.h> 10 #include <linux/kernel.h> 11 #include <linux/errno.h> 12 #include <linux/rational.h> 13 #include <linux/videodev2.h> 14 #include <linux/v4l2-dv-timings.h> 15 #include <media/v4l2-dv-timings.h> 16 #include <linux/math64.h> 17 #include <linux/hdmi.h> 18 19 MODULE_AUTHOR("Hans Verkuil"); 20 MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions"); 21 MODULE_LICENSE("GPL"); 22 23 const struct v4l2_dv_timings v4l2_dv_timings_presets[] = { 24 V4L2_DV_BT_CEA_640X480P59_94, 25 V4L2_DV_BT_CEA_720X480I59_94, 26 V4L2_DV_BT_CEA_720X480P59_94, 27 V4L2_DV_BT_CEA_720X576I50, 28 V4L2_DV_BT_CEA_720X576P50, 29 V4L2_DV_BT_CEA_1280X720P24, 30 V4L2_DV_BT_CEA_1280X720P25, 31 V4L2_DV_BT_CEA_1280X720P30, 32 V4L2_DV_BT_CEA_1280X720P50, 33 V4L2_DV_BT_CEA_1280X720P60, 34 V4L2_DV_BT_CEA_1920X1080P24, 35 V4L2_DV_BT_CEA_1920X1080P25, 36 V4L2_DV_BT_CEA_1920X1080P30, 37 V4L2_DV_BT_CEA_1920X1080I50, 38 V4L2_DV_BT_CEA_1920X1080P50, 39 V4L2_DV_BT_CEA_1920X1080I60, 40 V4L2_DV_BT_CEA_1920X1080P60, 41 V4L2_DV_BT_DMT_640X350P85, 42 V4L2_DV_BT_DMT_640X400P85, 43 V4L2_DV_BT_DMT_720X400P85, 44 V4L2_DV_BT_DMT_640X480P72, 45 V4L2_DV_BT_DMT_640X480P75, 46 V4L2_DV_BT_DMT_640X480P85, 47 V4L2_DV_BT_DMT_800X600P56, 48 V4L2_DV_BT_DMT_800X600P60, 49 V4L2_DV_BT_DMT_800X600P72, 50 V4L2_DV_BT_DMT_800X600P75, 51 V4L2_DV_BT_DMT_800X600P85, 52 V4L2_DV_BT_DMT_800X600P120_RB, 53 V4L2_DV_BT_DMT_848X480P60, 54 V4L2_DV_BT_DMT_1024X768I43, 55 V4L2_DV_BT_DMT_1024X768P60, 56 V4L2_DV_BT_DMT_1024X768P70, 57 V4L2_DV_BT_DMT_1024X768P75, 58 V4L2_DV_BT_DMT_1024X768P85, 59 V4L2_DV_BT_DMT_1024X768P120_RB, 60 V4L2_DV_BT_DMT_1152X864P75, 61 V4L2_DV_BT_DMT_1280X768P60_RB, 62 V4L2_DV_BT_DMT_1280X768P60, 63 V4L2_DV_BT_DMT_1280X768P75, 64 V4L2_DV_BT_DMT_1280X768P85, 65 V4L2_DV_BT_DMT_1280X768P120_RB, 66 V4L2_DV_BT_DMT_1280X800P60_RB, 67 V4L2_DV_BT_DMT_1280X800P60, 68 V4L2_DV_BT_DMT_1280X800P75, 69 V4L2_DV_BT_DMT_1280X800P85, 70 V4L2_DV_BT_DMT_1280X800P120_RB, 71 V4L2_DV_BT_DMT_1280X960P60, 72 V4L2_DV_BT_DMT_1280X960P85, 73 V4L2_DV_BT_DMT_1280X960P120_RB, 74 V4L2_DV_BT_DMT_1280X1024P60, 75 V4L2_DV_BT_DMT_1280X1024P75, 76 V4L2_DV_BT_DMT_1280X1024P85, 77 V4L2_DV_BT_DMT_1280X1024P120_RB, 78 V4L2_DV_BT_DMT_1360X768P60, 79 V4L2_DV_BT_DMT_1360X768P120_RB, 80 V4L2_DV_BT_DMT_1366X768P60, 81 V4L2_DV_BT_DMT_1366X768P60_RB, 82 V4L2_DV_BT_DMT_1400X1050P60_RB, 83 V4L2_DV_BT_DMT_1400X1050P60, 84 V4L2_DV_BT_DMT_1400X1050P75, 85 V4L2_DV_BT_DMT_1400X1050P85, 86 V4L2_DV_BT_DMT_1400X1050P120_RB, 87 V4L2_DV_BT_DMT_1440X900P60_RB, 88 V4L2_DV_BT_DMT_1440X900P60, 89 V4L2_DV_BT_DMT_1440X900P75, 90 V4L2_DV_BT_DMT_1440X900P85, 91 V4L2_DV_BT_DMT_1440X900P120_RB, 92 V4L2_DV_BT_DMT_1600X900P60_RB, 93 V4L2_DV_BT_DMT_1600X1200P60, 94 V4L2_DV_BT_DMT_1600X1200P65, 95 V4L2_DV_BT_DMT_1600X1200P70, 96 V4L2_DV_BT_DMT_1600X1200P75, 97 V4L2_DV_BT_DMT_1600X1200P85, 98 V4L2_DV_BT_DMT_1600X1200P120_RB, 99 V4L2_DV_BT_DMT_1680X1050P60_RB, 100 V4L2_DV_BT_DMT_1680X1050P60, 101 V4L2_DV_BT_DMT_1680X1050P75, 102 V4L2_DV_BT_DMT_1680X1050P85, 103 V4L2_DV_BT_DMT_1680X1050P120_RB, 104 V4L2_DV_BT_DMT_1792X1344P60, 105 V4L2_DV_BT_DMT_1792X1344P75, 106 V4L2_DV_BT_DMT_1792X1344P120_RB, 107 V4L2_DV_BT_DMT_1856X1392P60, 108 V4L2_DV_BT_DMT_1856X1392P75, 109 V4L2_DV_BT_DMT_1856X1392P120_RB, 110 V4L2_DV_BT_DMT_1920X1200P60_RB, 111 V4L2_DV_BT_DMT_1920X1200P60, 112 V4L2_DV_BT_DMT_1920X1200P75, 113 V4L2_DV_BT_DMT_1920X1200P85, 114 V4L2_DV_BT_DMT_1920X1200P120_RB, 115 V4L2_DV_BT_DMT_1920X1440P60, 116 V4L2_DV_BT_DMT_1920X1440P75, 117 V4L2_DV_BT_DMT_1920X1440P120_RB, 118 V4L2_DV_BT_DMT_2048X1152P60_RB, 119 V4L2_DV_BT_DMT_2560X1600P60_RB, 120 V4L2_DV_BT_DMT_2560X1600P60, 121 V4L2_DV_BT_DMT_2560X1600P75, 122 V4L2_DV_BT_DMT_2560X1600P85, 123 V4L2_DV_BT_DMT_2560X1600P120_RB, 124 V4L2_DV_BT_CEA_3840X2160P24, 125 V4L2_DV_BT_CEA_3840X2160P25, 126 V4L2_DV_BT_CEA_3840X2160P30, 127 V4L2_DV_BT_CEA_3840X2160P50, 128 V4L2_DV_BT_CEA_3840X2160P60, 129 V4L2_DV_BT_CEA_4096X2160P24, 130 V4L2_DV_BT_CEA_4096X2160P25, 131 V4L2_DV_BT_CEA_4096X2160P30, 132 V4L2_DV_BT_CEA_4096X2160P50, 133 V4L2_DV_BT_DMT_4096X2160P59_94_RB, 134 V4L2_DV_BT_CEA_4096X2160P60, 135 { } 136 }; 137 EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets); 138 139 bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t, 140 const struct v4l2_dv_timings_cap *dvcap, 141 v4l2_check_dv_timings_fnc fnc, 142 void *fnc_handle) 143 { 144 const struct v4l2_bt_timings *bt = &t->bt; 145 const struct v4l2_bt_timings_cap *cap = &dvcap->bt; 146 u32 caps = cap->capabilities; 147 148 if (t->type != V4L2_DV_BT_656_1120) 149 return false; 150 if (t->type != dvcap->type || 151 bt->height < cap->min_height || 152 bt->height > cap->max_height || 153 bt->width < cap->min_width || 154 bt->width > cap->max_width || 155 bt->pixelclock < cap->min_pixelclock || 156 bt->pixelclock > cap->max_pixelclock || 157 (!(caps & V4L2_DV_BT_CAP_CUSTOM) && 158 cap->standards && bt->standards && 159 !(bt->standards & cap->standards)) || 160 (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) || 161 (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE))) 162 return false; 163 return fnc == NULL || fnc(t, fnc_handle); 164 } 165 EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings); 166 167 int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t, 168 const struct v4l2_dv_timings_cap *cap, 169 v4l2_check_dv_timings_fnc fnc, 170 void *fnc_handle) 171 { 172 u32 i, idx; 173 174 memset(t->reserved, 0, sizeof(t->reserved)); 175 for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) { 176 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap, 177 fnc, fnc_handle) && 178 idx++ == t->index) { 179 t->timings = v4l2_dv_timings_presets[i]; 180 return 0; 181 } 182 } 183 return -EINVAL; 184 } 185 EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap); 186 187 bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t, 188 const struct v4l2_dv_timings_cap *cap, 189 unsigned pclock_delta, 190 v4l2_check_dv_timings_fnc fnc, 191 void *fnc_handle) 192 { 193 int i; 194 195 if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle)) 196 return false; 197 198 for (i = 0; i < v4l2_dv_timings_presets[i].bt.width; i++) { 199 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap, 200 fnc, fnc_handle) && 201 v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i, 202 pclock_delta, false)) { 203 u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS; 204 205 *t = v4l2_dv_timings_presets[i]; 206 if (can_reduce_fps(&t->bt)) 207 t->bt.flags |= flags; 208 209 return true; 210 } 211 } 212 return false; 213 } 214 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap); 215 216 bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic) 217 { 218 unsigned int i; 219 220 for (i = 0; i < v4l2_dv_timings_presets[i].bt.width; i++) { 221 const struct v4l2_bt_timings *bt = 222 &v4l2_dv_timings_presets[i].bt; 223 224 if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) && 225 bt->cea861_vic == vic) { 226 *t = v4l2_dv_timings_presets[i]; 227 return true; 228 } 229 } 230 return false; 231 } 232 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic); 233 234 /** 235 * v4l2_match_dv_timings - check if two timings match 236 * @t1: compare this v4l2_dv_timings struct... 237 * @t2: with this struct. 238 * @pclock_delta: the allowed pixelclock deviation. 239 * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not 240 * match. 241 * 242 * Compare t1 with t2 with a given margin of error for the pixelclock. 243 */ 244 bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1, 245 const struct v4l2_dv_timings *t2, 246 unsigned pclock_delta, bool match_reduced_fps) 247 { 248 if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120) 249 return false; 250 if (t1->bt.width == t2->bt.width && 251 t1->bt.height == t2->bt.height && 252 t1->bt.interlaced == t2->bt.interlaced && 253 t1->bt.polarities == t2->bt.polarities && 254 t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta && 255 t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta && 256 t1->bt.hfrontporch == t2->bt.hfrontporch && 257 t1->bt.hsync == t2->bt.hsync && 258 t1->bt.hbackporch == t2->bt.hbackporch && 259 t1->bt.vfrontporch == t2->bt.vfrontporch && 260 t1->bt.vsync == t2->bt.vsync && 261 t1->bt.vbackporch == t2->bt.vbackporch && 262 (!match_reduced_fps || 263 (t1->bt.flags & V4L2_DV_FL_REDUCED_FPS) == 264 (t2->bt.flags & V4L2_DV_FL_REDUCED_FPS)) && 265 (!t1->bt.interlaced || 266 (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch && 267 t1->bt.il_vsync == t2->bt.il_vsync && 268 t1->bt.il_vbackporch == t2->bt.il_vbackporch))) 269 return true; 270 return false; 271 } 272 EXPORT_SYMBOL_GPL(v4l2_match_dv_timings); 273 274 void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix, 275 const struct v4l2_dv_timings *t, bool detailed) 276 { 277 const struct v4l2_bt_timings *bt = &t->bt; 278 u32 htot, vtot; 279 u32 fps; 280 281 if (t->type != V4L2_DV_BT_656_1120) 282 return; 283 284 htot = V4L2_DV_BT_FRAME_WIDTH(bt); 285 vtot = V4L2_DV_BT_FRAME_HEIGHT(bt); 286 if (bt->interlaced) 287 vtot /= 2; 288 289 fps = (htot * vtot) > 0 ? div_u64((100 * (u64)bt->pixelclock), 290 (htot * vtot)) : 0; 291 292 if (prefix == NULL) 293 prefix = ""; 294 295 pr_info("%s: %s%ux%u%s%u.%u (%ux%u)\n", dev_prefix, prefix, 296 bt->width, bt->height, bt->interlaced ? "i" : "p", 297 fps / 100, fps % 100, htot, vtot); 298 299 if (!detailed) 300 return; 301 302 pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n", 303 dev_prefix, bt->hfrontporch, 304 (bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-", 305 bt->hsync, bt->hbackporch); 306 pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n", 307 dev_prefix, bt->vfrontporch, 308 (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-", 309 bt->vsync, bt->vbackporch); 310 if (bt->interlaced) 311 pr_info("%s: vertical bottom field: fp = %u, %ssync = %u, bp = %u\n", 312 dev_prefix, bt->il_vfrontporch, 313 (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-", 314 bt->il_vsync, bt->il_vbackporch); 315 pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock); 316 pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s%s%s%s\n", 317 dev_prefix, bt->flags, 318 (bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ? 319 " REDUCED_BLANKING" : "", 320 ((bt->flags & V4L2_DV_FL_REDUCED_BLANKING) && 321 bt->vsync == 8) ? " (V2)" : "", 322 (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ? 323 " CAN_REDUCE_FPS" : "", 324 (bt->flags & V4L2_DV_FL_REDUCED_FPS) ? 325 " REDUCED_FPS" : "", 326 (bt->flags & V4L2_DV_FL_HALF_LINE) ? 327 " HALF_LINE" : "", 328 (bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ? 329 " CE_VIDEO" : "", 330 (bt->flags & V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE) ? 331 " FIRST_FIELD_EXTRA_LINE" : "", 332 (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) ? 333 " HAS_PICTURE_ASPECT" : "", 334 (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) ? 335 " HAS_CEA861_VIC" : "", 336 (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) ? 337 " HAS_HDMI_VIC" : ""); 338 pr_info("%s: standards (0x%x):%s%s%s%s%s\n", dev_prefix, bt->standards, 339 (bt->standards & V4L2_DV_BT_STD_CEA861) ? " CEA" : "", 340 (bt->standards & V4L2_DV_BT_STD_DMT) ? " DMT" : "", 341 (bt->standards & V4L2_DV_BT_STD_CVT) ? " CVT" : "", 342 (bt->standards & V4L2_DV_BT_STD_GTF) ? " GTF" : "", 343 (bt->standards & V4L2_DV_BT_STD_SDI) ? " SDI" : ""); 344 if (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) 345 pr_info("%s: picture aspect (hor:vert): %u:%u\n", dev_prefix, 346 bt->picture_aspect.numerator, 347 bt->picture_aspect.denominator); 348 if (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) 349 pr_info("%s: CEA-861 VIC: %u\n", dev_prefix, bt->cea861_vic); 350 if (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) 351 pr_info("%s: HDMI VIC: %u\n", dev_prefix, bt->hdmi_vic); 352 } 353 EXPORT_SYMBOL_GPL(v4l2_print_dv_timings); 354 355 struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t) 356 { 357 struct v4l2_fract ratio = { 1, 1 }; 358 unsigned long n, d; 359 360 if (t->type != V4L2_DV_BT_656_1120) 361 return ratio; 362 if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT)) 363 return ratio; 364 365 ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator; 366 ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator; 367 368 rational_best_approximation(ratio.numerator, ratio.denominator, 369 ratio.numerator, ratio.denominator, &n, &d); 370 ratio.numerator = n; 371 ratio.denominator = d; 372 return ratio; 373 } 374 EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio); 375 376 /* 377 * CVT defines 378 * Based on Coordinated Video Timings Standard 379 * version 1.1 September 10, 2003 380 */ 381 382 #define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */ 383 #define CVT_PXL_CLK_GRAN_RB_V2 1000 /* granularity for reduced blanking v2*/ 384 385 /* Normal blanking */ 386 #define CVT_MIN_V_BPORCH 7 /* lines */ 387 #define CVT_MIN_V_PORCH_RND 3 /* lines */ 388 #define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */ 389 #define CVT_HSYNC_PERCENT 8 /* nominal hsync as percentage of line */ 390 391 /* Normal blanking for CVT uses GTF to calculate horizontal blanking */ 392 #define CVT_CELL_GRAN 8 /* character cell granularity */ 393 #define CVT_M 600 /* blanking formula gradient */ 394 #define CVT_C 40 /* blanking formula offset */ 395 #define CVT_K 128 /* blanking formula scaling factor */ 396 #define CVT_J 20 /* blanking formula scaling factor */ 397 #define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J) 398 #define CVT_M_PRIME (CVT_K * CVT_M / 256) 399 400 /* Reduced Blanking */ 401 #define CVT_RB_MIN_V_BPORCH 7 /* lines */ 402 #define CVT_RB_V_FPORCH 3 /* lines */ 403 #define CVT_RB_MIN_V_BLANK 460 /* us */ 404 #define CVT_RB_H_SYNC 32 /* pixels */ 405 #define CVT_RB_H_BLANK 160 /* pixels */ 406 /* Reduce blanking Version 2 */ 407 #define CVT_RB_V2_H_BLANK 80 /* pixels */ 408 #define CVT_RB_MIN_V_FPORCH 3 /* lines */ 409 #define CVT_RB_V2_MIN_V_FPORCH 1 /* lines */ 410 #define CVT_RB_V_BPORCH 6 /* lines */ 411 412 /** v4l2_detect_cvt - detect if the given timings follow the CVT standard 413 * @frame_height - the total height of the frame (including blanking) in lines. 414 * @hfreq - the horizontal frequency in Hz. 415 * @vsync - the height of the vertical sync in lines. 416 * @active_width - active width of image (does not include blanking). This 417 * information is needed only in case of version 2 of reduced blanking. 418 * In other cases, this parameter does not have any effect on timings. 419 * @polarities - the horizontal and vertical polarities (same as struct 420 * v4l2_bt_timings polarities). 421 * @interlaced - if this flag is true, it indicates interlaced format 422 * @fmt - the resulting timings. 423 * 424 * This function will attempt to detect if the given values correspond to a 425 * valid CVT format. If so, then it will return true, and fmt will be filled 426 * in with the found CVT timings. 427 */ 428 bool v4l2_detect_cvt(unsigned frame_height, 429 unsigned hfreq, 430 unsigned vsync, 431 unsigned active_width, 432 u32 polarities, 433 bool interlaced, 434 struct v4l2_dv_timings *fmt) 435 { 436 int v_fp, v_bp, h_fp, h_bp, hsync; 437 int frame_width, image_height, image_width; 438 bool reduced_blanking; 439 bool rb_v2 = false; 440 unsigned pix_clk; 441 442 if (vsync < 4 || vsync > 8) 443 return false; 444 445 if (polarities == V4L2_DV_VSYNC_POS_POL) 446 reduced_blanking = false; 447 else if (polarities == V4L2_DV_HSYNC_POS_POL) 448 reduced_blanking = true; 449 else 450 return false; 451 452 if (reduced_blanking && vsync == 8) 453 rb_v2 = true; 454 455 if (rb_v2 && active_width == 0) 456 return false; 457 458 if (!rb_v2 && vsync > 7) 459 return false; 460 461 if (hfreq == 0) 462 return false; 463 464 /* Vertical */ 465 if (reduced_blanking) { 466 if (rb_v2) { 467 v_bp = CVT_RB_V_BPORCH; 468 v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1; 469 v_fp -= vsync + v_bp; 470 471 if (v_fp < CVT_RB_V2_MIN_V_FPORCH) 472 v_fp = CVT_RB_V2_MIN_V_FPORCH; 473 } else { 474 v_fp = CVT_RB_V_FPORCH; 475 v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1; 476 v_bp -= vsync + v_fp; 477 478 if (v_bp < CVT_RB_MIN_V_BPORCH) 479 v_bp = CVT_RB_MIN_V_BPORCH; 480 } 481 } else { 482 v_fp = CVT_MIN_V_PORCH_RND; 483 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync; 484 485 if (v_bp < CVT_MIN_V_BPORCH) 486 v_bp = CVT_MIN_V_BPORCH; 487 } 488 489 if (interlaced) 490 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1; 491 else 492 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; 493 494 if (image_height < 0) 495 return false; 496 497 /* Aspect ratio based on vsync */ 498 switch (vsync) { 499 case 4: 500 image_width = (image_height * 4) / 3; 501 break; 502 case 5: 503 image_width = (image_height * 16) / 9; 504 break; 505 case 6: 506 image_width = (image_height * 16) / 10; 507 break; 508 case 7: 509 /* special case */ 510 if (image_height == 1024) 511 image_width = (image_height * 5) / 4; 512 else if (image_height == 768) 513 image_width = (image_height * 15) / 9; 514 else 515 return false; 516 break; 517 case 8: 518 image_width = active_width; 519 break; 520 default: 521 return false; 522 } 523 524 if (!rb_v2) 525 image_width = image_width & ~7; 526 527 /* Horizontal */ 528 if (reduced_blanking) { 529 int h_blank; 530 int clk_gran; 531 532 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK; 533 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN; 534 535 pix_clk = (image_width + h_blank) * hfreq; 536 pix_clk = (pix_clk / clk_gran) * clk_gran; 537 538 h_bp = h_blank / 2; 539 hsync = CVT_RB_H_SYNC; 540 h_fp = h_blank - h_bp - hsync; 541 542 frame_width = image_width + h_blank; 543 } else { 544 unsigned ideal_duty_cycle_per_myriad = 545 100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq; 546 int h_blank; 547 548 if (ideal_duty_cycle_per_myriad < 2000) 549 ideal_duty_cycle_per_myriad = 2000; 550 551 h_blank = image_width * ideal_duty_cycle_per_myriad / 552 (10000 - ideal_duty_cycle_per_myriad); 553 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN; 554 555 pix_clk = (image_width + h_blank) * hfreq; 556 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN; 557 558 h_bp = h_blank / 2; 559 frame_width = image_width + h_blank; 560 561 hsync = frame_width * CVT_HSYNC_PERCENT / 100; 562 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN; 563 h_fp = h_blank - hsync - h_bp; 564 } 565 566 fmt->type = V4L2_DV_BT_656_1120; 567 fmt->bt.polarities = polarities; 568 fmt->bt.width = image_width; 569 fmt->bt.height = image_height; 570 fmt->bt.hfrontporch = h_fp; 571 fmt->bt.vfrontporch = v_fp; 572 fmt->bt.hsync = hsync; 573 fmt->bt.vsync = vsync; 574 fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync; 575 576 if (!interlaced) { 577 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; 578 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE; 579 } else { 580 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp - 581 2 * vsync) / 2; 582 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp - 583 2 * vsync - fmt->bt.vbackporch; 584 fmt->bt.il_vfrontporch = v_fp; 585 fmt->bt.il_vsync = vsync; 586 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE; 587 fmt->bt.interlaced = V4L2_DV_INTERLACED; 588 } 589 590 fmt->bt.pixelclock = pix_clk; 591 fmt->bt.standards = V4L2_DV_BT_STD_CVT; 592 593 if (reduced_blanking) 594 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING; 595 596 return true; 597 } 598 EXPORT_SYMBOL_GPL(v4l2_detect_cvt); 599 600 /* 601 * GTF defines 602 * Based on Generalized Timing Formula Standard 603 * Version 1.1 September 2, 1999 604 */ 605 606 #define GTF_PXL_CLK_GRAN 250000 /* pixel clock granularity */ 607 608 #define GTF_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */ 609 #define GTF_V_FP 1 /* vertical front porch (lines) */ 610 #define GTF_CELL_GRAN 8 /* character cell granularity */ 611 612 /* Default */ 613 #define GTF_D_M 600 /* blanking formula gradient */ 614 #define GTF_D_C 40 /* blanking formula offset */ 615 #define GTF_D_K 128 /* blanking formula scaling factor */ 616 #define GTF_D_J 20 /* blanking formula scaling factor */ 617 #define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J) 618 #define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256) 619 620 /* Secondary */ 621 #define GTF_S_M 3600 /* blanking formula gradient */ 622 #define GTF_S_C 40 /* blanking formula offset */ 623 #define GTF_S_K 128 /* blanking formula scaling factor */ 624 #define GTF_S_J 35 /* blanking formula scaling factor */ 625 #define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J) 626 #define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256) 627 628 /** v4l2_detect_gtf - detect if the given timings follow the GTF standard 629 * @frame_height - the total height of the frame (including blanking) in lines. 630 * @hfreq - the horizontal frequency in Hz. 631 * @vsync - the height of the vertical sync in lines. 632 * @polarities - the horizontal and vertical polarities (same as struct 633 * v4l2_bt_timings polarities). 634 * @interlaced - if this flag is true, it indicates interlaced format 635 * @aspect - preferred aspect ratio. GTF has no method of determining the 636 * aspect ratio in order to derive the image width from the 637 * image height, so it has to be passed explicitly. Usually 638 * the native screen aspect ratio is used for this. If it 639 * is not filled in correctly, then 16:9 will be assumed. 640 * @fmt - the resulting timings. 641 * 642 * This function will attempt to detect if the given values correspond to a 643 * valid GTF format. If so, then it will return true, and fmt will be filled 644 * in with the found GTF timings. 645 */ 646 bool v4l2_detect_gtf(unsigned frame_height, 647 unsigned hfreq, 648 unsigned vsync, 649 u32 polarities, 650 bool interlaced, 651 struct v4l2_fract aspect, 652 struct v4l2_dv_timings *fmt) 653 { 654 int pix_clk; 655 int v_fp, v_bp, h_fp, hsync; 656 int frame_width, image_height, image_width; 657 bool default_gtf; 658 int h_blank; 659 660 if (vsync != 3) 661 return false; 662 663 if (polarities == V4L2_DV_VSYNC_POS_POL) 664 default_gtf = true; 665 else if (polarities == V4L2_DV_HSYNC_POS_POL) 666 default_gtf = false; 667 else 668 return false; 669 670 if (hfreq == 0) 671 return false; 672 673 /* Vertical */ 674 v_fp = GTF_V_FP; 675 v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync; 676 if (interlaced) 677 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1; 678 else 679 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; 680 681 if (image_height < 0) 682 return false; 683 684 if (aspect.numerator == 0 || aspect.denominator == 0) { 685 aspect.numerator = 16; 686 aspect.denominator = 9; 687 } 688 image_width = ((image_height * aspect.numerator) / aspect.denominator); 689 image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1); 690 691 /* Horizontal */ 692 if (default_gtf) { 693 u64 num; 694 u32 den; 695 696 num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) - 697 ((u64)image_width * GTF_D_M_PRIME * 1000)); 698 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) * 699 (2 * GTF_CELL_GRAN); 700 h_blank = div_u64((num + (den >> 1)), den); 701 h_blank *= (2 * GTF_CELL_GRAN); 702 } else { 703 u64 num; 704 u32 den; 705 706 num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) - 707 ((u64)image_width * GTF_S_M_PRIME * 1000)); 708 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) * 709 (2 * GTF_CELL_GRAN); 710 h_blank = div_u64((num + (den >> 1)), den); 711 h_blank *= (2 * GTF_CELL_GRAN); 712 } 713 714 frame_width = image_width + h_blank; 715 716 pix_clk = (image_width + h_blank) * hfreq; 717 pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN; 718 719 hsync = (frame_width * 8 + 50) / 100; 720 hsync = ((hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN) * GTF_CELL_GRAN; 721 722 h_fp = h_blank / 2 - hsync; 723 724 fmt->type = V4L2_DV_BT_656_1120; 725 fmt->bt.polarities = polarities; 726 fmt->bt.width = image_width; 727 fmt->bt.height = image_height; 728 fmt->bt.hfrontporch = h_fp; 729 fmt->bt.vfrontporch = v_fp; 730 fmt->bt.hsync = hsync; 731 fmt->bt.vsync = vsync; 732 fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync; 733 734 if (!interlaced) { 735 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; 736 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE; 737 } else { 738 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp - 739 2 * vsync) / 2; 740 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp - 741 2 * vsync - fmt->bt.vbackporch; 742 fmt->bt.il_vfrontporch = v_fp; 743 fmt->bt.il_vsync = vsync; 744 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE; 745 fmt->bt.interlaced = V4L2_DV_INTERLACED; 746 } 747 748 fmt->bt.pixelclock = pix_clk; 749 fmt->bt.standards = V4L2_DV_BT_STD_GTF; 750 751 if (!default_gtf) 752 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING; 753 754 return true; 755 } 756 EXPORT_SYMBOL_GPL(v4l2_detect_gtf); 757 758 /** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes 759 * 0x15 and 0x16 from the EDID. 760 * @hor_landscape - byte 0x15 from the EDID. 761 * @vert_portrait - byte 0x16 from the EDID. 762 * 763 * Determines the aspect ratio from the EDID. 764 * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2: 765 * "Horizontal and Vertical Screen Size or Aspect Ratio" 766 */ 767 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait) 768 { 769 struct v4l2_fract aspect = { 16, 9 }; 770 u8 ratio; 771 772 /* Nothing filled in, fallback to 16:9 */ 773 if (!hor_landscape && !vert_portrait) 774 return aspect; 775 /* Both filled in, so they are interpreted as the screen size in cm */ 776 if (hor_landscape && vert_portrait) { 777 aspect.numerator = hor_landscape; 778 aspect.denominator = vert_portrait; 779 return aspect; 780 } 781 /* Only one is filled in, so interpret them as a ratio: 782 (val + 99) / 100 */ 783 ratio = hor_landscape | vert_portrait; 784 /* Change some rounded values into the exact aspect ratio */ 785 if (ratio == 79) { 786 aspect.numerator = 16; 787 aspect.denominator = 9; 788 } else if (ratio == 34) { 789 aspect.numerator = 4; 790 aspect.denominator = 3; 791 } else if (ratio == 68) { 792 aspect.numerator = 15; 793 aspect.denominator = 9; 794 } else { 795 aspect.numerator = hor_landscape + 99; 796 aspect.denominator = 100; 797 } 798 if (hor_landscape) 799 return aspect; 800 /* The aspect ratio is for portrait, so swap numerator and denominator */ 801 swap(aspect.denominator, aspect.numerator); 802 return aspect; 803 } 804 EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio); 805 806 /** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information 807 * based on various InfoFrames. 808 * @avi: the AVI InfoFrame 809 * @hdmi: the HDMI Vendor InfoFrame, may be NULL 810 * @height: the frame height 811 * 812 * Determines the HDMI colorimetry information, i.e. how the HDMI 813 * pixel color data should be interpreted. 814 * 815 * Note that some of the newer features (DCI-P3, HDR) are not yet 816 * implemented: the hdmi.h header needs to be updated to the HDMI 2.0 817 * and CTA-861-G standards. 818 */ 819 struct v4l2_hdmi_colorimetry 820 v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi, 821 const struct hdmi_vendor_infoframe *hdmi, 822 unsigned int height) 823 { 824 struct v4l2_hdmi_colorimetry c = { 825 V4L2_COLORSPACE_SRGB, 826 V4L2_YCBCR_ENC_DEFAULT, 827 V4L2_QUANTIZATION_FULL_RANGE, 828 V4L2_XFER_FUNC_SRGB 829 }; 830 bool is_ce = avi->video_code || (hdmi && hdmi->vic); 831 bool is_sdtv = height <= 576; 832 bool default_is_lim_range_rgb = avi->video_code > 1; 833 834 switch (avi->colorspace) { 835 case HDMI_COLORSPACE_RGB: 836 /* RGB pixel encoding */ 837 switch (avi->colorimetry) { 838 case HDMI_COLORIMETRY_EXTENDED: 839 switch (avi->extended_colorimetry) { 840 case HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB: 841 c.colorspace = V4L2_COLORSPACE_ADOBERGB; 842 c.xfer_func = V4L2_XFER_FUNC_ADOBERGB; 843 break; 844 case HDMI_EXTENDED_COLORIMETRY_BT2020: 845 c.colorspace = V4L2_COLORSPACE_BT2020; 846 c.xfer_func = V4L2_XFER_FUNC_709; 847 break; 848 default: 849 break; 850 } 851 break; 852 default: 853 break; 854 } 855 switch (avi->quantization_range) { 856 case HDMI_QUANTIZATION_RANGE_LIMITED: 857 c.quantization = V4L2_QUANTIZATION_LIM_RANGE; 858 break; 859 case HDMI_QUANTIZATION_RANGE_FULL: 860 break; 861 default: 862 if (default_is_lim_range_rgb) 863 c.quantization = V4L2_QUANTIZATION_LIM_RANGE; 864 break; 865 } 866 break; 867 868 default: 869 /* YCbCr pixel encoding */ 870 c.quantization = V4L2_QUANTIZATION_LIM_RANGE; 871 switch (avi->colorimetry) { 872 case HDMI_COLORIMETRY_NONE: 873 if (!is_ce) 874 break; 875 if (is_sdtv) { 876 c.colorspace = V4L2_COLORSPACE_SMPTE170M; 877 c.ycbcr_enc = V4L2_YCBCR_ENC_601; 878 } else { 879 c.colorspace = V4L2_COLORSPACE_REC709; 880 c.ycbcr_enc = V4L2_YCBCR_ENC_709; 881 } 882 c.xfer_func = V4L2_XFER_FUNC_709; 883 break; 884 case HDMI_COLORIMETRY_ITU_601: 885 c.colorspace = V4L2_COLORSPACE_SMPTE170M; 886 c.ycbcr_enc = V4L2_YCBCR_ENC_601; 887 c.xfer_func = V4L2_XFER_FUNC_709; 888 break; 889 case HDMI_COLORIMETRY_ITU_709: 890 c.colorspace = V4L2_COLORSPACE_REC709; 891 c.ycbcr_enc = V4L2_YCBCR_ENC_709; 892 c.xfer_func = V4L2_XFER_FUNC_709; 893 break; 894 case HDMI_COLORIMETRY_EXTENDED: 895 switch (avi->extended_colorimetry) { 896 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601: 897 c.colorspace = V4L2_COLORSPACE_REC709; 898 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709; 899 c.xfer_func = V4L2_XFER_FUNC_709; 900 break; 901 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709: 902 c.colorspace = V4L2_COLORSPACE_REC709; 903 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601; 904 c.xfer_func = V4L2_XFER_FUNC_709; 905 break; 906 case HDMI_EXTENDED_COLORIMETRY_S_YCC_601: 907 c.colorspace = V4L2_COLORSPACE_SRGB; 908 c.ycbcr_enc = V4L2_YCBCR_ENC_601; 909 c.xfer_func = V4L2_XFER_FUNC_SRGB; 910 break; 911 case HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601: 912 c.colorspace = V4L2_COLORSPACE_ADOBERGB; 913 c.ycbcr_enc = V4L2_YCBCR_ENC_601; 914 c.xfer_func = V4L2_XFER_FUNC_ADOBERGB; 915 break; 916 case HDMI_EXTENDED_COLORIMETRY_BT2020: 917 c.colorspace = V4L2_COLORSPACE_BT2020; 918 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020; 919 c.xfer_func = V4L2_XFER_FUNC_709; 920 break; 921 case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM: 922 c.colorspace = V4L2_COLORSPACE_BT2020; 923 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM; 924 c.xfer_func = V4L2_XFER_FUNC_709; 925 break; 926 default: /* fall back to ITU_709 */ 927 c.colorspace = V4L2_COLORSPACE_REC709; 928 c.ycbcr_enc = V4L2_YCBCR_ENC_709; 929 c.xfer_func = V4L2_XFER_FUNC_709; 930 break; 931 } 932 break; 933 default: 934 break; 935 } 936 /* 937 * YCC Quantization Range signaling is more-or-less broken, 938 * let's just ignore this. 939 */ 940 break; 941 } 942 return c; 943 } 944 EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry); 945