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