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drm_modes.c
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linux-6.19.14/drivers/gpu/drm/drm_modes.c
1/* 2 * Copyright © 1997-2003 by The XFree86 Project, Inc. 3 * Copyright © 2007 Dave Airlie 4 * Copyright © 2007-2008 Intel Corporation 5 * Jesse Barnes <jesse.barnes@intel.com> 6 * Copyright 2005-2006 Luc Verhaegen 7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 25 * OTHER DEALINGS IN THE SOFTWARE. 26 * 27 * Except as contained in this notice, the name of the copyright holder(s) 28 * and author(s) shall not be used in advertising or otherwise to promote 29 * the sale, use or other dealings in this Software without prior written 30 * authorization from the copyright holder(s) and author(s). 31 */ 32 33#include <linux/ctype.h> 34#include <linux/export.h> 35#include <linux/fb.h> /* for KHZ2PICOS() */ 36#include <linux/list.h> 37#include <linux/list_sort.h> 38#include <linux/of.h> 39 40#include <video/of_display_timing.h> 41#include <video/of_videomode.h> 42#include <video/videomode.h> 43 44#include <drm/drm_crtc.h> 45#include <drm/drm_device.h> 46#include <drm/drm_edid.h> 47#include <drm/drm_modes.h> 48#include <drm/drm_print.h> 49 50#include "drm_crtc_internal.h" 51 52/** 53 * drm_mode_debug_printmodeline - print a mode to dmesg 54 * @mode: mode to print 55 * 56 * Describe @mode using DRM_DEBUG. 57 */ 58void drm_mode_debug_printmodeline(const struct drm_display_mode *mode) 59{ 60 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); 61} 62EXPORT_SYMBOL(drm_mode_debug_printmodeline); 63 64/** 65 * drm_mode_create - create a new display mode 66 * @dev: DRM device 67 * 68 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it 69 * and return it. 70 * 71 * Returns: 72 * Pointer to new mode on success, NULL on error. 73 */ 74struct drm_display_mode *drm_mode_create(struct drm_device *dev) 75{ 76 struct drm_display_mode *nmode; 77 78 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL); 79 if (!nmode) 80 return NULL; 81 82 return nmode; 83} 84EXPORT_SYMBOL(drm_mode_create); 85 86/** 87 * drm_mode_destroy - remove a mode 88 * @dev: DRM device 89 * @mode: mode to remove 90 * 91 * Release @mode's unique ID, then free it @mode structure itself using kfree. 92 */ 93void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode) 94{ 95 if (!mode) 96 return; 97 98 kfree(mode); 99} 100EXPORT_SYMBOL(drm_mode_destroy); 101 102/** 103 * drm_mode_probed_add - add a mode to a connector's probed_mode list 104 * @connector: connector the new mode 105 * @mode: mode data 106 * 107 * Add @mode to @connector's probed_mode list for later use. This list should 108 * then in a second step get filtered and all the modes actually supported by 109 * the hardware moved to the @connector's modes list. 110 */ 111void drm_mode_probed_add(struct drm_connector *connector, 112 struct drm_display_mode *mode) 113{ 114 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex)); 115 116 list_add_tail(&mode->head, &connector->probed_modes); 117} 118EXPORT_SYMBOL(drm_mode_probed_add); 119 120enum drm_mode_analog { 121 DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */ 122 DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */ 123}; 124 125/* 126 * The timings come from: 127 * - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html 128 * - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html 129 * - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm 130 */ 131#define NTSC_LINE_DURATION_NS 63556U 132#define NTSC_LINES_NUMBER 525 133 134#define NTSC_HBLK_DURATION_TYP_NS 10900U 135#define NTSC_HBLK_DURATION_MIN_NS (NTSC_HBLK_DURATION_TYP_NS - 200) 136#define NTSC_HBLK_DURATION_MAX_NS (NTSC_HBLK_DURATION_TYP_NS + 200) 137 138#define NTSC_HACT_DURATION_TYP_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS) 139#define NTSC_HACT_DURATION_MIN_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS) 140#define NTSC_HACT_DURATION_MAX_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS) 141 142#define NTSC_HFP_DURATION_TYP_NS 1500 143#define NTSC_HFP_DURATION_MIN_NS 1270 144#define NTSC_HFP_DURATION_MAX_NS 2220 145 146#define NTSC_HSLEN_DURATION_TYP_NS 4700 147#define NTSC_HSLEN_DURATION_MIN_NS (NTSC_HSLEN_DURATION_TYP_NS - 100) 148#define NTSC_HSLEN_DURATION_MAX_NS (NTSC_HSLEN_DURATION_TYP_NS + 100) 149 150#define NTSC_HBP_DURATION_TYP_NS 4700 151 152/* 153 * I couldn't find the actual tolerance for the back porch, so let's 154 * just reuse the sync length ones. 155 */ 156#define NTSC_HBP_DURATION_MIN_NS (NTSC_HBP_DURATION_TYP_NS - 100) 157#define NTSC_HBP_DURATION_MAX_NS (NTSC_HBP_DURATION_TYP_NS + 100) 158 159#define PAL_LINE_DURATION_NS 64000U 160#define PAL_LINES_NUMBER 625 161 162#define PAL_HACT_DURATION_TYP_NS 51950U 163#define PAL_HACT_DURATION_MIN_NS (PAL_HACT_DURATION_TYP_NS - 100) 164#define PAL_HACT_DURATION_MAX_NS (PAL_HACT_DURATION_TYP_NS + 400) 165 166#define PAL_HBLK_DURATION_TYP_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS) 167#define PAL_HBLK_DURATION_MIN_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS) 168#define PAL_HBLK_DURATION_MAX_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS) 169 170#define PAL_HFP_DURATION_TYP_NS 1650 171#define PAL_HFP_DURATION_MIN_NS (PAL_HFP_DURATION_TYP_NS - 100) 172#define PAL_HFP_DURATION_MAX_NS (PAL_HFP_DURATION_TYP_NS + 400) 173 174#define PAL_HSLEN_DURATION_TYP_NS 4700 175#define PAL_HSLEN_DURATION_MIN_NS (PAL_HSLEN_DURATION_TYP_NS - 200) 176#define PAL_HSLEN_DURATION_MAX_NS (PAL_HSLEN_DURATION_TYP_NS + 200) 177 178#define PAL_HBP_DURATION_TYP_NS 5700 179#define PAL_HBP_DURATION_MIN_NS (PAL_HBP_DURATION_TYP_NS - 200) 180#define PAL_HBP_DURATION_MAX_NS (PAL_HBP_DURATION_TYP_NS + 200) 181 182struct analog_param_field { 183 unsigned int even, odd; 184}; 185 186#define PARAM_FIELD(_odd, _even) \ 187 { .even = _even, .odd = _odd } 188 189struct analog_param_range { 190 unsigned int min, typ, max; 191}; 192 193#define PARAM_RANGE(_min, _typ, _max) \ 194 { .min = _min, .typ = _typ, .max = _max } 195 196struct analog_parameters { 197 unsigned int num_lines; 198 unsigned int line_duration_ns; 199 200 struct analog_param_range hact_ns; 201 struct analog_param_range hfp_ns; 202 struct analog_param_range hslen_ns; 203 struct analog_param_range hbp_ns; 204 struct analog_param_range hblk_ns; 205 206 unsigned int bt601_hfp; 207 208 struct analog_param_field vfp_lines; 209 struct analog_param_field vslen_lines; 210 struct analog_param_field vbp_lines; 211}; 212 213#define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp, \ 214 _hslen, _hbp, _hblk, _bt601_hfp, _vfp, \ 215 _vslen, _vbp) \ 216 [_mode] = { \ 217 .num_lines = _lines, \ 218 .line_duration_ns = _line_dur, \ 219 .hact_ns = _hact, \ 220 .hfp_ns = _hfp, \ 221 .hslen_ns = _hslen, \ 222 .hbp_ns = _hbp, \ 223 .hblk_ns = _hblk, \ 224 .bt601_hfp = _bt601_hfp, \ 225 .vfp_lines = _vfp, \ 226 .vslen_lines = _vslen, \ 227 .vbp_lines = _vbp, \ 228 } 229 230static const struct analog_parameters tv_modes_parameters[] = { 231 TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC, 232 NTSC_LINES_NUMBER, 233 NTSC_LINE_DURATION_NS, 234 PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS, 235 NTSC_HACT_DURATION_TYP_NS, 236 NTSC_HACT_DURATION_MAX_NS), 237 PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS, 238 NTSC_HFP_DURATION_TYP_NS, 239 NTSC_HFP_DURATION_MAX_NS), 240 PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS, 241 NTSC_HSLEN_DURATION_TYP_NS, 242 NTSC_HSLEN_DURATION_MAX_NS), 243 PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS, 244 NTSC_HBP_DURATION_TYP_NS, 245 NTSC_HBP_DURATION_MAX_NS), 246 PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS, 247 NTSC_HBLK_DURATION_TYP_NS, 248 NTSC_HBLK_DURATION_MAX_NS), 249 16, 250 PARAM_FIELD(3, 3), 251 PARAM_FIELD(3, 3), 252 PARAM_FIELD(16, 17)), 253 TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL, 254 PAL_LINES_NUMBER, 255 PAL_LINE_DURATION_NS, 256 PARAM_RANGE(PAL_HACT_DURATION_MIN_NS, 257 PAL_HACT_DURATION_TYP_NS, 258 PAL_HACT_DURATION_MAX_NS), 259 PARAM_RANGE(PAL_HFP_DURATION_MIN_NS, 260 PAL_HFP_DURATION_TYP_NS, 261 PAL_HFP_DURATION_MAX_NS), 262 PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS, 263 PAL_HSLEN_DURATION_TYP_NS, 264 PAL_HSLEN_DURATION_MAX_NS), 265 PARAM_RANGE(PAL_HBP_DURATION_MIN_NS, 266 PAL_HBP_DURATION_TYP_NS, 267 PAL_HBP_DURATION_MAX_NS), 268 PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS, 269 PAL_HBLK_DURATION_TYP_NS, 270 PAL_HBLK_DURATION_MAX_NS), 271 12, 272 273 /* 274 * The front porch is actually 6 short sync 275 * pulses for the even field, and 5 for the 276 * odd field. Each sync takes half a life so 277 * the odd field front porch is shorter by 278 * half a line. 279 * 280 * In progressive, we're supposed to use 6 281 * pulses, so we're fine there 282 */ 283 PARAM_FIELD(3, 2), 284 285 /* 286 * The vsync length is 5 long sync pulses, 287 * each field taking half a line. We're 288 * shorter for both fields by half a line. 289 * 290 * In progressive, we're supposed to use 5 291 * pulses, so we're off by half 292 * a line. 293 * 294 * In interlace, we're now off by half a line 295 * for the even field and one line for the odd 296 * field. 297 */ 298 PARAM_FIELD(3, 3), 299 300 /* 301 * The back porch starts with post-equalizing 302 * pulses, consisting in 5 short sync pulses 303 * for the even field, 4 for the odd field. In 304 * progressive, it's 5 short syncs. 305 * 306 * In progressive, we thus have 2.5 lines, 307 * plus the 0.5 line we were missing 308 * previously, so we should use 3 lines. 309 * 310 * In interlace, the even field is in the 311 * exact same case than progressive. For the 312 * odd field, we should be using 2 lines but 313 * we're one line short, so we'll make up for 314 * it here by using 3. 315 * 316 * The entire blanking area is supposed to 317 * take 25 lines, so we also need to account 318 * for the rest of the blanking area that 319 * can't be in either the front porch or sync 320 * period. 321 */ 322 PARAM_FIELD(19, 20)), 323}; 324 325static int fill_analog_mode(struct drm_device *dev, 326 struct drm_display_mode *mode, 327 const struct analog_parameters *params, 328 unsigned long pixel_clock_hz, 329 unsigned int hactive, 330 unsigned int vactive, 331 bool interlace) 332{ 333 unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz; 334 unsigned int htotal, vtotal; 335 unsigned int max_hact, hact_duration_ns; 336 unsigned int hblk, hblk_duration_ns; 337 unsigned int hfp, hfp_duration_ns; 338 unsigned int hslen, hslen_duration_ns; 339 unsigned int hbp, hbp_duration_ns; 340 unsigned int porches, porches_duration_ns; 341 unsigned int vfp, vfp_min; 342 unsigned int vbp, vbp_min; 343 unsigned int vslen; 344 bool bt601 = false; 345 int porches_rem; 346 u64 result; 347 348 drm_dbg_kms(dev, 349 "Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n", 350 hactive, vactive, 351 interlace ? 'i' : 'p', 352 params->num_lines, 353 pixel_clock_hz / 1000); 354 355 max_hact = params->hact_ns.max / pixel_duration_ns; 356 if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720) { 357 drm_dbg_kms(dev, "Trying to generate a BT.601 mode. Disabling checks.\n"); 358 bt601 = true; 359 } 360 361 /* 362 * Our pixel duration is going to be round down by the division, 363 * so rounding up is probably going to introduce even more 364 * deviation. 365 */ 366 result = (u64)params->line_duration_ns * pixel_clock_hz; 367 do_div(result, NSEC_PER_SEC); 368 htotal = result; 369 370 drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal); 371 372 hact_duration_ns = hactive * pixel_duration_ns; 373 if (!bt601 && 374 (hact_duration_ns < params->hact_ns.min || 375 hact_duration_ns > params->hact_ns.max)) { 376 drm_err(dev, "Invalid horizontal active area duration: %uns (min: %u, max %u)\n", 377 hact_duration_ns, params->hact_ns.min, params->hact_ns.max); 378 return -EINVAL; 379 } 380 381 hblk = htotal - hactive; 382 drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk); 383 384 hblk_duration_ns = hblk * pixel_duration_ns; 385 if (!bt601 && 386 (hblk_duration_ns < params->hblk_ns.min || 387 hblk_duration_ns > params->hblk_ns.max)) { 388 drm_err(dev, "Invalid horizontal blanking duration: %uns (min: %u, max %u)\n", 389 hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max); 390 return -EINVAL; 391 } 392 393 hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns); 394 drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen); 395 396 hslen_duration_ns = hslen * pixel_duration_ns; 397 if (!bt601 && 398 (hslen_duration_ns < params->hslen_ns.min || 399 hslen_duration_ns > params->hslen_ns.max)) { 400 drm_err(dev, "Invalid horizontal sync duration: %uns (min: %u, max %u)\n", 401 hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max); 402 return -EINVAL; 403 } 404 405 porches = hblk - hslen; 406 drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches); 407 408 porches_duration_ns = porches * pixel_duration_ns; 409 if (!bt601 && 410 (porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) || 411 porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) { 412 drm_err(dev, "Invalid horizontal porches duration: %uns\n", 413 porches_duration_ns); 414 return -EINVAL; 415 } 416 417 if (bt601) { 418 hfp = params->bt601_hfp; 419 } else { 420 unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min, 421 pixel_duration_ns); 422 unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min, 423 pixel_duration_ns); 424 int porches_rem = porches - hfp_min - hbp_min; 425 426 hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2); 427 } 428 429 drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp); 430 431 hfp_duration_ns = hfp * pixel_duration_ns; 432 if (!bt601 && 433 (hfp_duration_ns < params->hfp_ns.min || 434 hfp_duration_ns > params->hfp_ns.max)) { 435 drm_err(dev, "Invalid horizontal front porch duration: %uns (min: %u, max %u)\n", 436 hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max); 437 return -EINVAL; 438 } 439 440 hbp = porches - hfp; 441 drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp); 442 443 hbp_duration_ns = hbp * pixel_duration_ns; 444 if (!bt601 && 445 (hbp_duration_ns < params->hbp_ns.min || 446 hbp_duration_ns > params->hbp_ns.max)) { 447 drm_err(dev, "Invalid horizontal back porch duration: %uns (min: %u, max %u)\n", 448 hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max); 449 return -EINVAL; 450 } 451 452 if (htotal != (hactive + hfp + hslen + hbp)) 453 return -EINVAL; 454 455 mode->clock = pixel_clock_hz / 1000; 456 mode->hdisplay = hactive; 457 mode->hsync_start = mode->hdisplay + hfp; 458 mode->hsync_end = mode->hsync_start + hslen; 459 mode->htotal = mode->hsync_end + hbp; 460 461 if (interlace) { 462 vfp_min = params->vfp_lines.even + params->vfp_lines.odd; 463 vbp_min = params->vbp_lines.even + params->vbp_lines.odd; 464 vslen = params->vslen_lines.even + params->vslen_lines.odd; 465 } else { 466 /* 467 * By convention, NTSC (aka 525/60) systems start with 468 * the even field, but PAL (aka 625/50) systems start 469 * with the odd one. 470 * 471 * PAL systems also have asymmetric timings between the 472 * even and odd field, while NTSC is symmetric. 473 * 474 * Moreover, if we want to create a progressive mode for 475 * PAL, we need to use the odd field timings. 476 * 477 * Since odd == even for NTSC, we can just use the odd 478 * one all the time to simplify the code a bit. 479 */ 480 vfp_min = params->vfp_lines.odd; 481 vbp_min = params->vbp_lines.odd; 482 vslen = params->vslen_lines.odd; 483 } 484 485 drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen); 486 487 porches = params->num_lines - vactive - vslen; 488 drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches); 489 490 porches_rem = porches - vfp_min - vbp_min; 491 vfp = vfp_min + (porches_rem / 2); 492 drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp); 493 494 vbp = porches - vfp; 495 drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp); 496 497 vtotal = vactive + vfp + vslen + vbp; 498 if (params->num_lines != vtotal) { 499 drm_err(dev, "Invalid vertical total: %upx (expected %upx)\n", 500 vtotal, params->num_lines); 501 return -EINVAL; 502 } 503 504 mode->vdisplay = vactive; 505 mode->vsync_start = mode->vdisplay + vfp; 506 mode->vsync_end = mode->vsync_start + vslen; 507 mode->vtotal = mode->vsync_end + vbp; 508 509 if (mode->vtotal != params->num_lines) 510 return -EINVAL; 511 512 mode->type = DRM_MODE_TYPE_DRIVER; 513 mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC; 514 if (interlace) 515 mode->flags |= DRM_MODE_FLAG_INTERLACE; 516 517 drm_mode_set_name(mode); 518 519 drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); 520 521 return 0; 522} 523 524/** 525 * drm_analog_tv_mode - create a display mode for an analog TV 526 * @dev: drm device 527 * @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*. 528 * @pixel_clock_hz: Pixel Clock Frequency, in Hertz 529 * @hdisplay: hdisplay size 530 * @vdisplay: vdisplay size 531 * @interlace: whether to compute an interlaced mode 532 * 533 * This function creates a struct drm_display_mode instance suited for 534 * an analog TV output, for one of the usual analog TV modes. Where 535 * this is DRM_MODE_TV_MODE_MONOCHROME, a 625-line mode will be created. 536 * 537 * Note that @hdisplay is larger than the usual constraints for the PAL 538 * and NTSC timings, and we'll choose to ignore most timings constraints 539 * to reach those resolutions. 540 * 541 * Returns: 542 * A pointer to the mode, allocated with drm_mode_create(). Returns NULL 543 * on error. 544 */ 545struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev, 546 enum drm_connector_tv_mode tv_mode, 547 unsigned long pixel_clock_hz, 548 unsigned int hdisplay, 549 unsigned int vdisplay, 550 bool interlace) 551{ 552 struct drm_display_mode *mode; 553 enum drm_mode_analog analog; 554 int ret; 555 556 switch (tv_mode) { 557 case DRM_MODE_TV_MODE_NTSC: 558 fallthrough; 559 case DRM_MODE_TV_MODE_NTSC_443: 560 fallthrough; 561 case DRM_MODE_TV_MODE_NTSC_J: 562 fallthrough; 563 case DRM_MODE_TV_MODE_PAL_M: 564 analog = DRM_MODE_ANALOG_NTSC; 565 break; 566 567 case DRM_MODE_TV_MODE_PAL: 568 fallthrough; 569 case DRM_MODE_TV_MODE_PAL_N: 570 fallthrough; 571 case DRM_MODE_TV_MODE_SECAM: 572 fallthrough; 573 case DRM_MODE_TV_MODE_MONOCHROME: 574 analog = DRM_MODE_ANALOG_PAL; 575 break; 576 577 default: 578 return NULL; 579 } 580 581 mode = drm_mode_create(dev); 582 if (!mode) 583 return NULL; 584 585 ret = fill_analog_mode(dev, mode, 586 &tv_modes_parameters[analog], 587 pixel_clock_hz, hdisplay, vdisplay, interlace); 588 if (ret) 589 goto err_free_mode; 590 591 return mode; 592 593err_free_mode: 594 drm_mode_destroy(dev, mode); 595 return NULL; 596} 597EXPORT_SYMBOL(drm_analog_tv_mode); 598 599/** 600 * drm_cvt_mode -create a modeline based on the CVT algorithm 601 * @dev: drm device 602 * @hdisplay: hdisplay size 603 * @vdisplay: vdisplay size 604 * @vrefresh: vrefresh rate 605 * @reduced: whether to use reduced blanking 606 * @interlaced: whether to compute an interlaced mode 607 * @margins: whether to add margins (borders) 608 * 609 * This function is called to generate the modeline based on CVT algorithm 610 * according to the hdisplay, vdisplay, vrefresh. 611 * It is based from the VESA(TM) Coordinated Video Timing Generator by 612 * Graham Loveridge April 9, 2003 available at 613 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls 614 * 615 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c. 616 * What I have done is to translate it by using integer calculation. 617 * 618 * Returns: 619 * The modeline based on the CVT algorithm stored in a drm_display_mode object. 620 * The display mode object is allocated with drm_mode_create(). Returns NULL 621 * when no mode could be allocated. 622 */ 623struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay, 624 int vdisplay, int vrefresh, 625 bool reduced, bool interlaced, bool margins) 626{ 627#define HV_FACTOR 1000 628 /* 1) top/bottom margin size (% of height) - default: 1.8, */ 629#define CVT_MARGIN_PERCENTAGE 18 630 /* 2) character cell horizontal granularity (pixels) - default 8 */ 631#define CVT_H_GRANULARITY 8 632 /* 3) Minimum vertical porch (lines) - default 3 */ 633#define CVT_MIN_V_PORCH 3 634 /* 4) Minimum number of vertical back porch lines - default 6 */ 635#define CVT_MIN_V_BPORCH 6 636 /* Pixel Clock step (kHz) */ 637#define CVT_CLOCK_STEP 250 638 struct drm_display_mode *drm_mode; 639 unsigned int vfieldrate, hperiod; 640 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync; 641 int interlace; 642 u64 tmp; 643 644 if (!hdisplay || !vdisplay) 645 return NULL; 646 647 /* allocate the drm_display_mode structure. If failure, we will 648 * return directly 649 */ 650 drm_mode = drm_mode_create(dev); 651 if (!drm_mode) 652 return NULL; 653 654 /* the CVT default refresh rate is 60Hz */ 655 if (!vrefresh) 656 vrefresh = 60; 657 658 /* the required field fresh rate */ 659 if (interlaced) 660 vfieldrate = vrefresh * 2; 661 else 662 vfieldrate = vrefresh; 663 664 /* horizontal pixels */ 665 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY); 666 667 /* determine the left&right borders */ 668 hmargin = 0; 669 if (margins) { 670 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000; 671 hmargin -= hmargin % CVT_H_GRANULARITY; 672 } 673 /* find the total active pixels */ 674 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin; 675 676 /* find the number of lines per field */ 677 if (interlaced) 678 vdisplay_rnd = vdisplay / 2; 679 else 680 vdisplay_rnd = vdisplay; 681 682 /* find the top & bottom borders */ 683 vmargin = 0; 684 if (margins) 685 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000; 686 687 drm_mode->vdisplay = vdisplay + 2 * vmargin; 688 689 /* Interlaced */ 690 if (interlaced) 691 interlace = 1; 692 else 693 interlace = 0; 694 695 /* Determine VSync Width from aspect ratio */ 696 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay)) 697 vsync = 4; 698 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay)) 699 vsync = 5; 700 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay)) 701 vsync = 6; 702 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay)) 703 vsync = 7; 704 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay)) 705 vsync = 7; 706 else /* custom */ 707 vsync = 10; 708 709 if (!reduced) { 710 /* simplify the GTF calculation */ 711 /* 4) Minimum time of vertical sync + back porch interval (µs) 712 * default 550.0 713 */ 714 int tmp1, tmp2; 715#define CVT_MIN_VSYNC_BP 550 716 /* 3) Nominal HSync width (% of line period) - default 8 */ 717#define CVT_HSYNC_PERCENTAGE 8 718 unsigned int hblank_percentage; 719 int vsyncandback_porch, __maybe_unused vback_porch, hblank; 720 721 /* estimated the horizontal period */ 722 tmp1 = HV_FACTOR * 1000000 - 723 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate; 724 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 + 725 interlace; 726 hperiod = tmp1 * 2 / (tmp2 * vfieldrate); 727 728 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1; 729 /* 9. Find number of lines in sync + backporch */ 730 if (tmp1 < (vsync + CVT_MIN_V_PORCH)) 731 vsyncandback_porch = vsync + CVT_MIN_V_PORCH; 732 else 733 vsyncandback_porch = tmp1; 734 /* 10. Find number of lines in back porch */ 735 vback_porch = vsyncandback_porch - vsync; 736 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + 737 vsyncandback_porch + CVT_MIN_V_PORCH; 738 /* 5) Definition of Horizontal blanking time limitation */ 739 /* Gradient (%/kHz) - default 600 */ 740#define CVT_M_FACTOR 600 741 /* Offset (%) - default 40 */ 742#define CVT_C_FACTOR 40 743 /* Blanking time scaling factor - default 128 */ 744#define CVT_K_FACTOR 128 745 /* Scaling factor weighting - default 20 */ 746#define CVT_J_FACTOR 20 747#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256) 748#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \ 749 CVT_J_FACTOR) 750 /* 12. Find ideal blanking duty cycle from formula */ 751 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME * 752 hperiod / 1000; 753 /* 13. Blanking time */ 754 if (hblank_percentage < 20 * HV_FACTOR) 755 hblank_percentage = 20 * HV_FACTOR; 756 hblank = drm_mode->hdisplay * hblank_percentage / 757 (100 * HV_FACTOR - hblank_percentage); 758 hblank -= hblank % (2 * CVT_H_GRANULARITY); 759 /* 14. find the total pixels per line */ 760 drm_mode->htotal = drm_mode->hdisplay + hblank; 761 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2; 762 drm_mode->hsync_start = drm_mode->hsync_end - 763 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100; 764 drm_mode->hsync_start += CVT_H_GRANULARITY - 765 drm_mode->hsync_start % CVT_H_GRANULARITY; 766 /* fill the Vsync values */ 767 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH; 768 drm_mode->vsync_end = drm_mode->vsync_start + vsync; 769 } else { 770 /* Reduced blanking */ 771 /* Minimum vertical blanking interval time (µs)- default 460 */ 772#define CVT_RB_MIN_VBLANK 460 773 /* Fixed number of clocks for horizontal sync */ 774#define CVT_RB_H_SYNC 32 775 /* Fixed number of clocks for horizontal blanking */ 776#define CVT_RB_H_BLANK 160 777 /* Fixed number of lines for vertical front porch - default 3*/ 778#define CVT_RB_VFPORCH 3 779 int vbilines; 780 int tmp1, tmp2; 781 /* 8. Estimate Horizontal period. */ 782 tmp1 = HV_FACTOR * 1000000 - 783 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate; 784 tmp2 = vdisplay_rnd + 2 * vmargin; 785 hperiod = tmp1 / (tmp2 * vfieldrate); 786 /* 9. Find number of lines in vertical blanking */ 787 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1; 788 /* 10. Check if vertical blanking is sufficient */ 789 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH)) 790 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH; 791 /* 11. Find total number of lines in vertical field */ 792 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines; 793 /* 12. Find total number of pixels in a line */ 794 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK; 795 /* Fill in HSync values */ 796 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2; 797 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC; 798 /* Fill in VSync values */ 799 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH; 800 drm_mode->vsync_end = drm_mode->vsync_start + vsync; 801 } 802 /* 15/13. Find pixel clock frequency (kHz for xf86) */ 803 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */ 804 tmp *= HV_FACTOR * 1000; 805 do_div(tmp, hperiod); 806 tmp -= drm_mode->clock % CVT_CLOCK_STEP; 807 drm_mode->clock = tmp; 808 /* 18/16. Find actual vertical frame frequency */ 809 /* ignore - just set the mode flag for interlaced */ 810 if (interlaced) { 811 drm_mode->vtotal *= 2; 812 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE; 813 } 814 /* Fill the mode line name */ 815 drm_mode_set_name(drm_mode); 816 if (reduced) 817 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC | 818 DRM_MODE_FLAG_NVSYNC); 819 else 820 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC | 821 DRM_MODE_FLAG_NHSYNC); 822 823 return drm_mode; 824} 825EXPORT_SYMBOL(drm_cvt_mode); 826 827/** 828 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm 829 * @dev: drm device 830 * @hdisplay: hdisplay size 831 * @vdisplay: vdisplay size 832 * @vrefresh: vrefresh rate. 833 * @interlaced: whether to compute an interlaced mode 834 * @margins: desired margin (borders) size 835 * @GTF_M: extended GTF formula parameters 836 * @GTF_2C: extended GTF formula parameters 837 * @GTF_K: extended GTF formula parameters 838 * @GTF_2J: extended GTF formula parameters 839 * 840 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them 841 * in here multiplied by two. For a C of 40, pass in 80. 842 * 843 * Returns: 844 * The modeline based on the full GTF algorithm stored in a drm_display_mode object. 845 * The display mode object is allocated with drm_mode_create(). Returns NULL 846 * when no mode could be allocated. 847 */ 848struct drm_display_mode * 849drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay, 850 int vrefresh, bool interlaced, int margins, 851 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J) 852{ /* 1) top/bottom margin size (% of height) - default: 1.8, */ 853#define GTF_MARGIN_PERCENTAGE 18 854 /* 2) character cell horizontal granularity (pixels) - default 8 */ 855#define GTF_CELL_GRAN 8 856 /* 3) Minimum vertical porch (lines) - default 3 */ 857#define GTF_MIN_V_PORCH 1 858 /* width of vsync in lines */ 859#define V_SYNC_RQD 3 860 /* width of hsync as % of total line */ 861#define H_SYNC_PERCENT 8 862 /* min time of vsync + back porch (microsec) */ 863#define MIN_VSYNC_PLUS_BP 550 864 /* C' and M' are part of the Blanking Duty Cycle computation */ 865#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2) 866#define GTF_M_PRIME (GTF_K * GTF_M / 256) 867 struct drm_display_mode *drm_mode; 868 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd; 869 int top_margin, bottom_margin; 870 int interlace; 871 unsigned int hfreq_est; 872 int vsync_plus_bp, __maybe_unused vback_porch; 873 unsigned int vtotal_lines, __maybe_unused vfieldrate_est; 874 unsigned int __maybe_unused hperiod; 875 unsigned int vfield_rate, __maybe_unused vframe_rate; 876 int left_margin, right_margin; 877 unsigned int total_active_pixels, ideal_duty_cycle; 878 unsigned int hblank, total_pixels, pixel_freq; 879 int hsync, hfront_porch, vodd_front_porch_lines; 880 unsigned int tmp1, tmp2; 881 882 if (!hdisplay || !vdisplay) 883 return NULL; 884 885 drm_mode = drm_mode_create(dev); 886 if (!drm_mode) 887 return NULL; 888 889 /* 1. In order to give correct results, the number of horizontal 890 * pixels requested is first processed to ensure that it is divisible 891 * by the character size, by rounding it to the nearest character 892 * cell boundary: 893 */ 894 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN; 895 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN; 896 897 /* 2. If interlace is requested, the number of vertical lines assumed 898 * by the calculation must be halved, as the computation calculates 899 * the number of vertical lines per field. 900 */ 901 if (interlaced) 902 vdisplay_rnd = vdisplay / 2; 903 else 904 vdisplay_rnd = vdisplay; 905 906 /* 3. Find the frame rate required: */ 907 if (interlaced) 908 vfieldrate_rqd = vrefresh * 2; 909 else 910 vfieldrate_rqd = vrefresh; 911 912 /* 4. Find number of lines in Top margin: */ 913 top_margin = 0; 914 if (margins) 915 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) / 916 1000; 917 /* 5. Find number of lines in bottom margin: */ 918 bottom_margin = top_margin; 919 920 /* 6. If interlace is required, then set variable interlace: */ 921 if (interlaced) 922 interlace = 1; 923 else 924 interlace = 0; 925 926 /* 7. Estimate the Horizontal frequency */ 927 { 928 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500; 929 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) * 930 2 + interlace; 931 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1; 932 } 933 934 /* 8. Find the number of lines in V sync + back porch */ 935 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */ 936 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000; 937 vsync_plus_bp = (vsync_plus_bp + 500) / 1000; 938 /* 9. Find the number of lines in V back porch alone: */ 939 vback_porch = vsync_plus_bp - V_SYNC_RQD; 940 /* 10. Find the total number of lines in Vertical field period: */ 941 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin + 942 vsync_plus_bp + GTF_MIN_V_PORCH; 943 /* 11. Estimate the Vertical field frequency: */ 944 vfieldrate_est = hfreq_est / vtotal_lines; 945 /* 12. Find the actual horizontal period: */ 946 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines); 947 948 /* 13. Find the actual Vertical field frequency: */ 949 vfield_rate = hfreq_est / vtotal_lines; 950 /* 14. Find the Vertical frame frequency: */ 951 if (interlaced) 952 vframe_rate = vfield_rate / 2; 953 else 954 vframe_rate = vfield_rate; 955 /* 15. Find number of pixels in left margin: */ 956 if (margins) 957 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) / 958 1000; 959 else 960 left_margin = 0; 961 962 /* 16.Find number of pixels in right margin: */ 963 right_margin = left_margin; 964 /* 17.Find total number of active pixels in image and left and right */ 965 total_active_pixels = hdisplay_rnd + left_margin + right_margin; 966 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */ 967 ideal_duty_cycle = GTF_C_PRIME * 1000 - 968 (GTF_M_PRIME * 1000000 / hfreq_est); 969 /* 19.Find the number of pixels in the blanking time to the nearest 970 * double character cell: */ 971 hblank = total_active_pixels * ideal_duty_cycle / 972 (100000 - ideal_duty_cycle); 973 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN); 974 hblank = hblank * 2 * GTF_CELL_GRAN; 975 /* 20.Find total number of pixels: */ 976 total_pixels = total_active_pixels + hblank; 977 /* 21.Find pixel clock frequency: */ 978 pixel_freq = total_pixels * hfreq_est / 1000; 979 /* Stage 1 computations are now complete; I should really pass 980 * the results to another function and do the Stage 2 computations, 981 * but I only need a few more values so I'll just append the 982 * computations here for now */ 983 /* 17. Find the number of pixels in the horizontal sync period: */ 984 hsync = H_SYNC_PERCENT * total_pixels / 100; 985 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN; 986 hsync = hsync * GTF_CELL_GRAN; 987 /* 18. Find the number of pixels in horizontal front porch period */ 988 hfront_porch = hblank / 2 - hsync; 989 /* 36. Find the number of lines in the odd front porch period: */ 990 vodd_front_porch_lines = GTF_MIN_V_PORCH ; 991 992 /* finally, pack the results in the mode struct */ 993 drm_mode->hdisplay = hdisplay_rnd; 994 drm_mode->hsync_start = hdisplay_rnd + hfront_porch; 995 drm_mode->hsync_end = drm_mode->hsync_start + hsync; 996 drm_mode->htotal = total_pixels; 997 drm_mode->vdisplay = vdisplay_rnd; 998 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines; 999 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD; 1000 drm_mode->vtotal = vtotal_lines; 1001 1002 drm_mode->clock = pixel_freq; 1003 1004 if (interlaced) { 1005 drm_mode->vtotal *= 2; 1006 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE; 1007 } 1008 1009 drm_mode_set_name(drm_mode); 1010 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40) 1011 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC; 1012 else 1013 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC; 1014 1015 return drm_mode; 1016} 1017EXPORT_SYMBOL(drm_gtf_mode_complex); 1018 1019/** 1020 * drm_gtf_mode - create the modeline based on the GTF algorithm 1021 * @dev: drm device 1022 * @hdisplay: hdisplay size 1023 * @vdisplay: vdisplay size 1024 * @vrefresh: vrefresh rate. 1025 * @interlaced: whether to compute an interlaced mode 1026 * @margins: desired margin (borders) size 1027 * 1028 * return the modeline based on GTF algorithm 1029 * 1030 * This function is to create the modeline based on the GTF algorithm. 1031 * Generalized Timing Formula is derived from: 1032 * 1033 * GTF Spreadsheet by Andy Morrish (1/5/97) 1034 * available at https://www.vesa.org 1035 * 1036 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c. 1037 * What I have done is to translate it by using integer calculation. 1038 * I also refer to the function of fb_get_mode in the file of 1039 * drivers/video/fbmon.c 1040 * 1041 * Standard GTF parameters:: 1042 * 1043 * M = 600 1044 * C = 40 1045 * K = 128 1046 * J = 20 1047 * 1048 * Returns: 1049 * The modeline based on the GTF algorithm stored in a drm_display_mode object. 1050 * The display mode object is allocated with drm_mode_create(). Returns NULL 1051 * when no mode could be allocated. 1052 */ 1053struct drm_display_mode * 1054drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh, 1055 bool interlaced, int margins) 1056{ 1057 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh, 1058 interlaced, margins, 1059 600, 40 * 2, 128, 20 * 2); 1060} 1061EXPORT_SYMBOL(drm_gtf_mode); 1062 1063#ifdef CONFIG_VIDEOMODE_HELPERS 1064/** 1065 * drm_display_mode_from_videomode - fill in @dmode using @vm, 1066 * @vm: videomode structure to use as source 1067 * @dmode: drm_display_mode structure to use as destination 1068 * 1069 * Fills out @dmode using the display mode specified in @vm. 1070 */ 1071void drm_display_mode_from_videomode(const struct videomode *vm, 1072 struct drm_display_mode *dmode) 1073{ 1074 dmode->hdisplay = vm->hactive; 1075 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch; 1076 dmode->hsync_end = dmode->hsync_start + vm->hsync_len; 1077 dmode->htotal = dmode->hsync_end + vm->hback_porch; 1078 1079 dmode->vdisplay = vm->vactive; 1080 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch; 1081 dmode->vsync_end = dmode->vsync_start + vm->vsync_len; 1082 dmode->vtotal = dmode->vsync_end + vm->vback_porch; 1083 1084 dmode->clock = vm->pixelclock / 1000; 1085 1086 dmode->flags = 0; 1087 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) 1088 dmode->flags |= DRM_MODE_FLAG_PHSYNC; 1089 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW) 1090 dmode->flags |= DRM_MODE_FLAG_NHSYNC; 1091 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) 1092 dmode->flags |= DRM_MODE_FLAG_PVSYNC; 1093 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW) 1094 dmode->flags |= DRM_MODE_FLAG_NVSYNC; 1095 if (vm->flags & DISPLAY_FLAGS_INTERLACED) 1096 dmode->flags |= DRM_MODE_FLAG_INTERLACE; 1097 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) 1098 dmode->flags |= DRM_MODE_FLAG_DBLSCAN; 1099 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK) 1100 dmode->flags |= DRM_MODE_FLAG_DBLCLK; 1101 drm_mode_set_name(dmode); 1102} 1103EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode); 1104 1105/** 1106 * drm_display_mode_to_videomode - fill in @vm using @dmode, 1107 * @dmode: drm_display_mode structure to use as source 1108 * @vm: videomode structure to use as destination 1109 * 1110 * Fills out @vm using the display mode specified in @dmode. 1111 */ 1112void drm_display_mode_to_videomode(const struct drm_display_mode *dmode, 1113 struct videomode *vm) 1114{ 1115 vm->hactive = dmode->hdisplay; 1116 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay; 1117 vm->hsync_len = dmode->hsync_end - dmode->hsync_start; 1118 vm->hback_porch = dmode->htotal - dmode->hsync_end; 1119 1120 vm->vactive = dmode->vdisplay; 1121 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay; 1122 vm->vsync_len = dmode->vsync_end - dmode->vsync_start; 1123 vm->vback_porch = dmode->vtotal - dmode->vsync_end; 1124 1125 vm->pixelclock = dmode->clock * 1000; 1126 1127 vm->flags = 0; 1128 if (dmode->flags & DRM_MODE_FLAG_PHSYNC) 1129 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH; 1130 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC) 1131 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW; 1132 if (dmode->flags & DRM_MODE_FLAG_PVSYNC) 1133 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH; 1134 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC) 1135 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW; 1136 if (dmode->flags & DRM_MODE_FLAG_INTERLACE) 1137 vm->flags |= DISPLAY_FLAGS_INTERLACED; 1138 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN) 1139 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN; 1140 if (dmode->flags & DRM_MODE_FLAG_DBLCLK) 1141 vm->flags |= DISPLAY_FLAGS_DOUBLECLK; 1142} 1143EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode); 1144 1145/** 1146 * drm_bus_flags_from_videomode - extract information about pixelclk and 1147 * DE polarity from videomode and store it in a separate variable 1148 * @vm: videomode structure to use 1149 * @bus_flags: information about pixelclk, sync and DE polarity will be stored 1150 * here 1151 * 1152 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE 1153 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS 1154 * found in @vm 1155 */ 1156void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags) 1157{ 1158 *bus_flags = 0; 1159 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE) 1160 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE; 1161 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) 1162 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE; 1163 1164 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE) 1165 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE; 1166 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE) 1167 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE; 1168 1169 if (vm->flags & DISPLAY_FLAGS_DE_LOW) 1170 *bus_flags |= DRM_BUS_FLAG_DE_LOW; 1171 if (vm->flags & DISPLAY_FLAGS_DE_HIGH) 1172 *bus_flags |= DRM_BUS_FLAG_DE_HIGH; 1173} 1174EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode); 1175 1176#ifdef CONFIG_OF 1177/** 1178 * of_get_drm_display_mode - get a drm_display_mode from devicetree 1179 * @np: device_node with the timing specification 1180 * @dmode: will be set to the return value 1181 * @bus_flags: information about pixelclk, sync and DE polarity 1182 * @index: index into the list of display timings in devicetree 1183 * 1184 * This function is expensive and should only be used, if only one mode is to be 1185 * read from DT. To get multiple modes start with of_get_display_timings and 1186 * work with that instead. 1187 * 1188 * Returns: 1189 * 0 on success, a negative errno code when no of videomode node was found. 1190 */ 1191int of_get_drm_display_mode(struct device_node *np, 1192 struct drm_display_mode *dmode, u32 *bus_flags, 1193 int index) 1194{ 1195 struct videomode vm; 1196 int ret; 1197 1198 ret = of_get_videomode(np, &vm, index); 1199 if (ret) 1200 return ret; 1201 1202 drm_display_mode_from_videomode(&vm, dmode); 1203 if (bus_flags) 1204 drm_bus_flags_from_videomode(&vm, bus_flags); 1205 1206 pr_debug("%pOF: got %dx%d display mode: " DRM_MODE_FMT "\n", 1207 np, vm.hactive, vm.vactive, DRM_MODE_ARG(dmode)); 1208 1209 return 0; 1210} 1211EXPORT_SYMBOL_GPL(of_get_drm_display_mode); 1212 1213/** 1214 * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree 1215 * @np: device_node with the panel-timing specification 1216 * @dmode: will be set to the return value 1217 * @bus_flags: information about pixelclk, sync and DE polarity 1218 * 1219 * The mandatory Device Tree properties width-mm and height-mm 1220 * are read and set on the display mode. 1221 * 1222 * Returns: 1223 * Zero on success, negative error code on failure. 1224 */ 1225int of_get_drm_panel_display_mode(struct device_node *np, 1226 struct drm_display_mode *dmode, u32 *bus_flags) 1227{ 1228 u32 width_mm = 0, height_mm = 0; 1229 struct display_timing timing; 1230 struct videomode vm; 1231 int ret; 1232 1233 ret = of_get_display_timing(np, "panel-timing", &timing); 1234 if (ret) 1235 return ret; 1236 1237 videomode_from_timing(&timing, &vm); 1238 1239 memset(dmode, 0, sizeof(*dmode)); 1240 drm_display_mode_from_videomode(&vm, dmode); 1241 if (bus_flags) 1242 drm_bus_flags_from_videomode(&vm, bus_flags); 1243 1244 ret = of_property_read_u32(np, "width-mm", &width_mm); 1245 if (ret) 1246 return ret; 1247 1248 ret = of_property_read_u32(np, "height-mm", &height_mm); 1249 if (ret) 1250 return ret; 1251 1252 dmode->width_mm = width_mm; 1253 dmode->height_mm = height_mm; 1254 1255 pr_debug(DRM_MODE_FMT "\n", DRM_MODE_ARG(dmode)); 1256 1257 return 0; 1258} 1259EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode); 1260#endif /* CONFIG_OF */ 1261#endif /* CONFIG_VIDEOMODE_HELPERS */ 1262 1263/** 1264 * drm_mode_set_name - set the name on a mode 1265 * @mode: name will be set in this mode 1266 * 1267 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay> 1268 * with an optional 'i' suffix for interlaced modes. 1269 */ 1270void drm_mode_set_name(struct drm_display_mode *mode) 1271{ 1272 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1273 1274 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s", 1275 mode->hdisplay, mode->vdisplay, 1276 interlaced ? "i" : ""); 1277} 1278EXPORT_SYMBOL(drm_mode_set_name); 1279 1280/** 1281 * drm_mode_vrefresh - get the vrefresh of a mode 1282 * @mode: mode 1283 * 1284 * Returns: 1285 * @modes's vrefresh rate in Hz, rounded to the nearest integer. 1286 */ 1287int drm_mode_vrefresh(const struct drm_display_mode *mode) 1288{ 1289 unsigned int num = 1, den = 1; 1290 1291 if (mode->htotal == 0 || mode->vtotal == 0) 1292 return 0; 1293 1294 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 1295 num *= 2; 1296 if (mode->flags & DRM_MODE_FLAG_DBLSCAN) 1297 den *= 2; 1298 if (mode->vscan > 1) 1299 den *= mode->vscan; 1300 1301 if (check_mul_overflow(mode->clock, num, &num)) 1302 return 0; 1303 1304 if (check_mul_overflow(mode->htotal * mode->vtotal, den, &den)) 1305 return 0; 1306 1307 return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den); 1308} 1309EXPORT_SYMBOL(drm_mode_vrefresh); 1310 1311/** 1312 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode 1313 * @mode: mode to query 1314 * @hdisplay: hdisplay value to fill in 1315 * @vdisplay: vdisplay value to fill in 1316 * 1317 * The vdisplay value will be doubled if the specified mode is a stereo mode of 1318 * the appropriate layout. 1319 */ 1320void drm_mode_get_hv_timing(const struct drm_display_mode *mode, 1321 int *hdisplay, int *vdisplay) 1322{ 1323 struct drm_display_mode adjusted; 1324 1325 drm_mode_init(&adjusted, mode); 1326 1327 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY); 1328 *hdisplay = adjusted.crtc_hdisplay; 1329 *vdisplay = adjusted.crtc_vdisplay; 1330} 1331EXPORT_SYMBOL(drm_mode_get_hv_timing); 1332 1333/** 1334 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters 1335 * @p: mode 1336 * @adjust_flags: a combination of adjustment flags 1337 * 1338 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary. 1339 * 1340 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of 1341 * interlaced modes. 1342 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for 1343 * buffers containing two eyes (only adjust the timings when needed, eg. for 1344 * "frame packing" or "side by side full"). 1345 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not* 1346 * be performed for doublescan and vscan > 1 modes respectively. 1347 */ 1348void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags) 1349{ 1350 if (!p) 1351 return; 1352 1353 p->crtc_clock = p->clock; 1354 p->crtc_hdisplay = p->hdisplay; 1355 p->crtc_hsync_start = p->hsync_start; 1356 p->crtc_hsync_end = p->hsync_end; 1357 p->crtc_htotal = p->htotal; 1358 p->crtc_hskew = p->hskew; 1359 p->crtc_vdisplay = p->vdisplay; 1360 p->crtc_vsync_start = p->vsync_start; 1361 p->crtc_vsync_end = p->vsync_end; 1362 p->crtc_vtotal = p->vtotal; 1363 1364 if (p->flags & DRM_MODE_FLAG_INTERLACE) { 1365 if (adjust_flags & CRTC_INTERLACE_HALVE_V) { 1366 p->crtc_vdisplay /= 2; 1367 p->crtc_vsync_start /= 2; 1368 p->crtc_vsync_end /= 2; 1369 p->crtc_vtotal /= 2; 1370 } 1371 } 1372 1373 if (!(adjust_flags & CRTC_NO_DBLSCAN)) { 1374 if (p->flags & DRM_MODE_FLAG_DBLSCAN) { 1375 p->crtc_vdisplay *= 2; 1376 p->crtc_vsync_start *= 2; 1377 p->crtc_vsync_end *= 2; 1378 p->crtc_vtotal *= 2; 1379 } 1380 } 1381 1382 if (!(adjust_flags & CRTC_NO_VSCAN)) { 1383 if (p->vscan > 1) { 1384 p->crtc_vdisplay *= p->vscan; 1385 p->crtc_vsync_start *= p->vscan; 1386 p->crtc_vsync_end *= p->vscan; 1387 p->crtc_vtotal *= p->vscan; 1388 } 1389 } 1390 1391 if (adjust_flags & CRTC_STEREO_DOUBLE) { 1392 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK; 1393 1394 switch (layout) { 1395 case DRM_MODE_FLAG_3D_FRAME_PACKING: 1396 p->crtc_clock *= 2; 1397 p->crtc_vdisplay += p->crtc_vtotal; 1398 p->crtc_vsync_start += p->crtc_vtotal; 1399 p->crtc_vsync_end += p->crtc_vtotal; 1400 p->crtc_vtotal += p->crtc_vtotal; 1401 break; 1402 } 1403 } 1404 1405 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay); 1406 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal); 1407 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay); 1408 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal); 1409} 1410EXPORT_SYMBOL(drm_mode_set_crtcinfo); 1411 1412/** 1413 * drm_mode_copy - copy the mode 1414 * @dst: mode to overwrite 1415 * @src: mode to copy 1416 * 1417 * Copy an existing mode into another mode, preserving the 1418 * list head of the destination mode. 1419 */ 1420void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src) 1421{ 1422 struct list_head head = dst->head; 1423 1424 *dst = *src; 1425 dst->head = head; 1426} 1427EXPORT_SYMBOL(drm_mode_copy); 1428 1429/** 1430 * drm_mode_init - initialize the mode from another mode 1431 * @dst: mode to overwrite 1432 * @src: mode to copy 1433 * 1434 * Copy an existing mode into another mode, zeroing the 1435 * list head of the destination mode. Typically used 1436 * to guarantee the list head is not left with stack 1437 * garbage in on-stack modes. 1438 */ 1439void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src) 1440{ 1441 memset(dst, 0, sizeof(*dst)); 1442 drm_mode_copy(dst, src); 1443} 1444EXPORT_SYMBOL(drm_mode_init); 1445 1446/** 1447 * drm_mode_duplicate - allocate and duplicate an existing mode 1448 * @dev: drm_device to allocate the duplicated mode for 1449 * @mode: mode to duplicate 1450 * 1451 * Just allocate a new mode, copy the existing mode into it, and return 1452 * a pointer to it. Used to create new instances of established modes. 1453 * 1454 * Returns: 1455 * Pointer to duplicated mode on success, NULL on error. 1456 */ 1457struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev, 1458 const struct drm_display_mode *mode) 1459{ 1460 struct drm_display_mode *nmode; 1461 1462 nmode = drm_mode_create(dev); 1463 if (!nmode) 1464 return NULL; 1465 1466 drm_mode_copy(nmode, mode); 1467 1468 return nmode; 1469} 1470EXPORT_SYMBOL(drm_mode_duplicate); 1471 1472static bool drm_mode_match_timings(const struct drm_display_mode *mode1, 1473 const struct drm_display_mode *mode2) 1474{ 1475 return mode1->hdisplay == mode2->hdisplay && 1476 mode1->hsync_start == mode2->hsync_start && 1477 mode1->hsync_end == mode2->hsync_end && 1478 mode1->htotal == mode2->htotal && 1479 mode1->hskew == mode2->hskew && 1480 mode1->vdisplay == mode2->vdisplay && 1481 mode1->vsync_start == mode2->vsync_start && 1482 mode1->vsync_end == mode2->vsync_end && 1483 mode1->vtotal == mode2->vtotal && 1484 mode1->vscan == mode2->vscan; 1485} 1486 1487static bool drm_mode_match_clock(const struct drm_display_mode *mode1, 1488 const struct drm_display_mode *mode2) 1489{ 1490 /* 1491 * do clock check convert to PICOS 1492 * so fb modes get matched the same 1493 */ 1494 if (mode1->clock && mode2->clock) 1495 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock); 1496 else 1497 return mode1->clock == mode2->clock; 1498} 1499 1500static bool drm_mode_match_flags(const struct drm_display_mode *mode1, 1501 const struct drm_display_mode *mode2) 1502{ 1503 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) == 1504 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK); 1505} 1506 1507static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1, 1508 const struct drm_display_mode *mode2) 1509{ 1510 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) == 1511 (mode2->flags & DRM_MODE_FLAG_3D_MASK); 1512} 1513 1514static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1, 1515 const struct drm_display_mode *mode2) 1516{ 1517 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio; 1518} 1519 1520/** 1521 * drm_mode_match - test modes for (partial) equality 1522 * @mode1: first mode 1523 * @mode2: second mode 1524 * @match_flags: which parts need to match (DRM_MODE_MATCH_*) 1525 * 1526 * Check to see if @mode1 and @mode2 are equivalent. 1527 * 1528 * Returns: 1529 * True if the modes are (partially) equal, false otherwise. 1530 */ 1531bool drm_mode_match(const struct drm_display_mode *mode1, 1532 const struct drm_display_mode *mode2, 1533 unsigned int match_flags) 1534{ 1535 if (!mode1 && !mode2) 1536 return true; 1537 1538 if (!mode1 || !mode2) 1539 return false; 1540 1541 if (match_flags & DRM_MODE_MATCH_TIMINGS && 1542 !drm_mode_match_timings(mode1, mode2)) 1543 return false; 1544 1545 if (match_flags & DRM_MODE_MATCH_CLOCK && 1546 !drm_mode_match_clock(mode1, mode2)) 1547 return false; 1548 1549 if (match_flags & DRM_MODE_MATCH_FLAGS && 1550 !drm_mode_match_flags(mode1, mode2)) 1551 return false; 1552 1553 if (match_flags & DRM_MODE_MATCH_3D_FLAGS && 1554 !drm_mode_match_3d_flags(mode1, mode2)) 1555 return false; 1556 1557 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO && 1558 !drm_mode_match_aspect_ratio(mode1, mode2)) 1559 return false; 1560 1561 return true; 1562} 1563EXPORT_SYMBOL(drm_mode_match); 1564 1565/** 1566 * drm_mode_equal - test modes for equality 1567 * @mode1: first mode 1568 * @mode2: second mode 1569 * 1570 * Check to see if @mode1 and @mode2 are equivalent. 1571 * 1572 * Returns: 1573 * True if the modes are equal, false otherwise. 1574 */ 1575bool drm_mode_equal(const struct drm_display_mode *mode1, 1576 const struct drm_display_mode *mode2) 1577{ 1578 return drm_mode_match(mode1, mode2, 1579 DRM_MODE_MATCH_TIMINGS | 1580 DRM_MODE_MATCH_CLOCK | 1581 DRM_MODE_MATCH_FLAGS | 1582 DRM_MODE_MATCH_3D_FLAGS| 1583 DRM_MODE_MATCH_ASPECT_RATIO); 1584} 1585EXPORT_SYMBOL(drm_mode_equal); 1586 1587/** 1588 * drm_mode_equal_no_clocks - test modes for equality 1589 * @mode1: first mode 1590 * @mode2: second mode 1591 * 1592 * Check to see if @mode1 and @mode2 are equivalent, but 1593 * don't check the pixel clocks. 1594 * 1595 * Returns: 1596 * True if the modes are equal, false otherwise. 1597 */ 1598bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1, 1599 const struct drm_display_mode *mode2) 1600{ 1601 return drm_mode_match(mode1, mode2, 1602 DRM_MODE_MATCH_TIMINGS | 1603 DRM_MODE_MATCH_FLAGS | 1604 DRM_MODE_MATCH_3D_FLAGS); 1605} 1606EXPORT_SYMBOL(drm_mode_equal_no_clocks); 1607 1608/** 1609 * drm_mode_equal_no_clocks_no_stereo - test modes for equality 1610 * @mode1: first mode 1611 * @mode2: second mode 1612 * 1613 * Check to see if @mode1 and @mode2 are equivalent, but 1614 * don't check the pixel clocks nor the stereo layout. 1615 * 1616 * Returns: 1617 * True if the modes are equal, false otherwise. 1618 */ 1619bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1, 1620 const struct drm_display_mode *mode2) 1621{ 1622 return drm_mode_match(mode1, mode2, 1623 DRM_MODE_MATCH_TIMINGS | 1624 DRM_MODE_MATCH_FLAGS); 1625} 1626EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo); 1627 1628static enum drm_mode_status 1629drm_mode_validate_basic(const struct drm_display_mode *mode) 1630{ 1631 if (mode->type & ~DRM_MODE_TYPE_ALL) 1632 return MODE_BAD; 1633 1634 if (mode->flags & ~DRM_MODE_FLAG_ALL) 1635 return MODE_BAD; 1636 1637 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX) 1638 return MODE_BAD; 1639 1640 if (mode->clock == 0) 1641 return MODE_CLOCK_LOW; 1642 1643 if (mode->hdisplay == 0 || 1644 mode->hsync_start < mode->hdisplay || 1645 mode->hsync_end < mode->hsync_start || 1646 mode->htotal < mode->hsync_end) 1647 return MODE_H_ILLEGAL; 1648 1649 if (mode->vdisplay == 0 || 1650 mode->vsync_start < mode->vdisplay || 1651 mode->vsync_end < mode->vsync_start || 1652 mode->vtotal < mode->vsync_end) 1653 return MODE_V_ILLEGAL; 1654 1655 return MODE_OK; 1656} 1657 1658/** 1659 * drm_mode_validate_driver - make sure the mode is somewhat sane 1660 * @dev: drm device 1661 * @mode: mode to check 1662 * 1663 * First do basic validation on the mode, and then allow the driver 1664 * to check for device/driver specific limitations via the optional 1665 * &drm_mode_config_helper_funcs.mode_valid hook. 1666 * 1667 * Returns: 1668 * The mode status 1669 */ 1670enum drm_mode_status 1671drm_mode_validate_driver(struct drm_device *dev, 1672 const struct drm_display_mode *mode) 1673{ 1674 enum drm_mode_status status; 1675 1676 status = drm_mode_validate_basic(mode); 1677 if (status != MODE_OK) 1678 return status; 1679 1680 if (dev->mode_config.funcs->mode_valid) 1681 return dev->mode_config.funcs->mode_valid(dev, mode); 1682 else 1683 return MODE_OK; 1684} 1685EXPORT_SYMBOL(drm_mode_validate_driver); 1686 1687/** 1688 * drm_mode_validate_size - make sure modes adhere to size constraints 1689 * @mode: mode to check 1690 * @maxX: maximum width 1691 * @maxY: maximum height 1692 * 1693 * This function is a helper which can be used to validate modes against size 1694 * limitations of the DRM device/connector. If a mode is too big its status 1695 * member is updated with the appropriate validation failure code. The list 1696 * itself is not changed. 1697 * 1698 * Returns: 1699 * The mode status 1700 */ 1701enum drm_mode_status 1702drm_mode_validate_size(const struct drm_display_mode *mode, 1703 int maxX, int maxY) 1704{ 1705 if (maxX > 0 && mode->hdisplay > maxX) 1706 return MODE_VIRTUAL_X; 1707 1708 if (maxY > 0 && mode->vdisplay > maxY) 1709 return MODE_VIRTUAL_Y; 1710 1711 return MODE_OK; 1712} 1713EXPORT_SYMBOL(drm_mode_validate_size); 1714 1715/** 1716 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed 1717 * @mode: mode to check 1718 * @connector: drm connector under action 1719 * 1720 * This function is a helper which can be used to filter out any YCBCR420 1721 * only mode, when the source doesn't support it. 1722 * 1723 * Returns: 1724 * The mode status 1725 */ 1726enum drm_mode_status 1727drm_mode_validate_ycbcr420(const struct drm_display_mode *mode, 1728 struct drm_connector *connector) 1729{ 1730 if (!connector->ycbcr_420_allowed && 1731 drm_mode_is_420_only(&connector->display_info, mode)) 1732 return MODE_NO_420; 1733 1734 return MODE_OK; 1735} 1736EXPORT_SYMBOL(drm_mode_validate_ycbcr420); 1737 1738#define MODE_STATUS(status) [MODE_ ## status + 3] = #status 1739 1740static const char * const drm_mode_status_names[] = { 1741 MODE_STATUS(OK), 1742 MODE_STATUS(HSYNC), 1743 MODE_STATUS(VSYNC), 1744 MODE_STATUS(H_ILLEGAL), 1745 MODE_STATUS(V_ILLEGAL), 1746 MODE_STATUS(BAD_WIDTH), 1747 MODE_STATUS(NOMODE), 1748 MODE_STATUS(NO_INTERLACE), 1749 MODE_STATUS(NO_DBLESCAN), 1750 MODE_STATUS(NO_VSCAN), 1751 MODE_STATUS(MEM), 1752 MODE_STATUS(VIRTUAL_X), 1753 MODE_STATUS(VIRTUAL_Y), 1754 MODE_STATUS(MEM_VIRT), 1755 MODE_STATUS(NOCLOCK), 1756 MODE_STATUS(CLOCK_HIGH), 1757 MODE_STATUS(CLOCK_LOW), 1758 MODE_STATUS(CLOCK_RANGE), 1759 MODE_STATUS(BAD_HVALUE), 1760 MODE_STATUS(BAD_VVALUE), 1761 MODE_STATUS(BAD_VSCAN), 1762 MODE_STATUS(HSYNC_NARROW), 1763 MODE_STATUS(HSYNC_WIDE), 1764 MODE_STATUS(HBLANK_NARROW), 1765 MODE_STATUS(HBLANK_WIDE), 1766 MODE_STATUS(VSYNC_NARROW), 1767 MODE_STATUS(VSYNC_WIDE), 1768 MODE_STATUS(VBLANK_NARROW), 1769 MODE_STATUS(VBLANK_WIDE), 1770 MODE_STATUS(PANEL), 1771 MODE_STATUS(INTERLACE_WIDTH), 1772 MODE_STATUS(ONE_WIDTH), 1773 MODE_STATUS(ONE_HEIGHT), 1774 MODE_STATUS(ONE_SIZE), 1775 MODE_STATUS(NO_REDUCED), 1776 MODE_STATUS(NO_STEREO), 1777 MODE_STATUS(NO_420), 1778 MODE_STATUS(STALE), 1779 MODE_STATUS(BAD), 1780 MODE_STATUS(ERROR), 1781}; 1782 1783#undef MODE_STATUS 1784 1785const char *drm_get_mode_status_name(enum drm_mode_status status) 1786{ 1787 int index = status + 3; 1788 1789 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names))) 1790 return ""; 1791 1792 return drm_mode_status_names[index]; 1793} 1794 1795/** 1796 * drm_mode_prune_invalid - remove invalid modes from mode list 1797 * @dev: DRM device 1798 * @mode_list: list of modes to check 1799 * @verbose: be verbose about it 1800 * 1801 * This helper function can be used to prune a display mode list after 1802 * validation has been completed. All modes whose status is not MODE_OK will be 1803 * removed from the list, and if @verbose the status code and mode name is also 1804 * printed to dmesg. 1805 */ 1806void drm_mode_prune_invalid(struct drm_device *dev, 1807 struct list_head *mode_list, bool verbose) 1808{ 1809 struct drm_display_mode *mode, *t; 1810 1811 list_for_each_entry_safe(mode, t, mode_list, head) { 1812 if (mode->status != MODE_OK) { 1813 list_del(&mode->head); 1814 if (mode->type & DRM_MODE_TYPE_USERDEF) { 1815 drm_warn(dev, "User-defined mode not supported: " 1816 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); 1817 } 1818 if (verbose) { 1819 drm_dbg_kms(dev, "Rejected mode: " DRM_MODE_FMT " (%s)\n", 1820 DRM_MODE_ARG(mode), drm_get_mode_status_name(mode->status)); 1821 } 1822 drm_mode_destroy(dev, mode); 1823 } 1824 } 1825} 1826EXPORT_SYMBOL(drm_mode_prune_invalid); 1827 1828/** 1829 * drm_mode_compare - compare modes for favorability 1830 * @priv: unused 1831 * @lh_a: list_head for first mode 1832 * @lh_b: list_head for second mode 1833 * 1834 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating 1835 * which is better. 1836 * 1837 * Returns: 1838 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or 1839 * positive if @lh_b is better than @lh_a. 1840 */ 1841static int drm_mode_compare(void *priv, const struct list_head *lh_a, 1842 const struct list_head *lh_b) 1843{ 1844 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head); 1845 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head); 1846 int diff; 1847 1848 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) - 1849 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0); 1850 if (diff) 1851 return diff; 1852 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay; 1853 if (diff) 1854 return diff; 1855 1856 diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a); 1857 if (diff) 1858 return diff; 1859 1860 diff = b->clock - a->clock; 1861 return diff; 1862} 1863 1864/** 1865 * drm_mode_sort - sort mode list 1866 * @mode_list: list of drm_display_mode structures to sort 1867 * 1868 * Sort @mode_list by favorability, moving good modes to the head of the list. 1869 */ 1870void drm_mode_sort(struct list_head *mode_list) 1871{ 1872 list_sort(NULL, mode_list, drm_mode_compare); 1873} 1874EXPORT_SYMBOL(drm_mode_sort); 1875 1876/** 1877 * drm_connector_list_update - update the mode list for the connector 1878 * @connector: the connector to update 1879 * 1880 * This moves the modes from the @connector probed_modes list 1881 * to the actual mode list. It compares the probed mode against the current 1882 * list and only adds different/new modes. 1883 * 1884 * This is just a helper functions doesn't validate any modes itself and also 1885 * doesn't prune any invalid modes. Callers need to do that themselves. 1886 */ 1887void drm_connector_list_update(struct drm_connector *connector) 1888{ 1889 struct drm_display_mode *pmode, *pt; 1890 1891 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex)); 1892 1893 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) { 1894 struct drm_display_mode *mode; 1895 bool found_it = false; 1896 1897 /* go through current modes checking for the new probed mode */ 1898 list_for_each_entry(mode, &connector->modes, head) { 1899 if (!drm_mode_equal(pmode, mode)) 1900 continue; 1901 1902 found_it = true; 1903 1904 /* 1905 * If the old matching mode is stale (ie. left over 1906 * from a previous probe) just replace it outright. 1907 * Otherwise just merge the type bits between all 1908 * equal probed modes. 1909 * 1910 * If two probed modes are considered equal, pick the 1911 * actual timings from the one that's marked as 1912 * preferred (in case the match isn't 100%). If 1913 * multiple or zero preferred modes are present, favor 1914 * the mode added to the probed_modes list first. 1915 */ 1916 if (mode->status == MODE_STALE) { 1917 drm_mode_copy(mode, pmode); 1918 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 && 1919 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) { 1920 pmode->type |= mode->type; 1921 drm_mode_copy(mode, pmode); 1922 } else { 1923 mode->type |= pmode->type; 1924 } 1925 1926 list_del(&pmode->head); 1927 drm_mode_destroy(connector->dev, pmode); 1928 break; 1929 } 1930 1931 if (!found_it) { 1932 list_move_tail(&pmode->head, &connector->modes); 1933 } 1934 } 1935} 1936EXPORT_SYMBOL(drm_connector_list_update); 1937 1938static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr, 1939 struct drm_cmdline_mode *mode) 1940{ 1941 unsigned int bpp; 1942 1943 if (str[0] != '-') 1944 return -EINVAL; 1945 1946 str++; 1947 bpp = simple_strtol(str, end_ptr, 10); 1948 if (*end_ptr == str) 1949 return -EINVAL; 1950 1951 mode->bpp = bpp; 1952 mode->bpp_specified = true; 1953 1954 return 0; 1955} 1956 1957static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr, 1958 struct drm_cmdline_mode *mode) 1959{ 1960 unsigned int refresh; 1961 1962 if (str[0] != '@') 1963 return -EINVAL; 1964 1965 str++; 1966 refresh = simple_strtol(str, end_ptr, 10); 1967 if (*end_ptr == str) 1968 return -EINVAL; 1969 1970 mode->refresh = refresh; 1971 mode->refresh_specified = true; 1972 1973 return 0; 1974} 1975 1976static int drm_mode_parse_cmdline_extra(const char *str, int length, 1977 bool freestanding, 1978 const struct drm_connector *connector, 1979 struct drm_cmdline_mode *mode) 1980{ 1981 int i; 1982 1983 for (i = 0; i < length; i++) { 1984 switch (str[i]) { 1985 case 'i': 1986 if (freestanding) 1987 return -EINVAL; 1988 1989 mode->interlace = true; 1990 break; 1991 case 'm': 1992 if (freestanding) 1993 return -EINVAL; 1994 1995 mode->margins = true; 1996 break; 1997 case 'D': 1998 if (mode->force != DRM_FORCE_UNSPECIFIED) 1999 return -EINVAL; 2000 2001 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) && 2002 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB)) 2003 mode->force = DRM_FORCE_ON; 2004 else 2005 mode->force = DRM_FORCE_ON_DIGITAL; 2006 break; 2007 case 'd': 2008 if (mode->force != DRM_FORCE_UNSPECIFIED) 2009 return -EINVAL; 2010 2011 mode->force = DRM_FORCE_OFF; 2012 break; 2013 case 'e': 2014 if (mode->force != DRM_FORCE_UNSPECIFIED) 2015 return -EINVAL; 2016 2017 mode->force = DRM_FORCE_ON; 2018 break; 2019 default: 2020 return -EINVAL; 2021 } 2022 } 2023 2024 return 0; 2025} 2026 2027static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length, 2028 bool extras, 2029 const struct drm_connector *connector, 2030 struct drm_cmdline_mode *mode) 2031{ 2032 const char *str_start = str; 2033 bool rb = false, cvt = false; 2034 int xres = 0, yres = 0; 2035 int remaining, i; 2036 char *end_ptr; 2037 2038 xres = simple_strtol(str, &end_ptr, 10); 2039 if (end_ptr == str) 2040 return -EINVAL; 2041 2042 if (end_ptr[0] != 'x') 2043 return -EINVAL; 2044 end_ptr++; 2045 2046 str = end_ptr; 2047 yres = simple_strtol(str, &end_ptr, 10); 2048 if (end_ptr == str) 2049 return -EINVAL; 2050 2051 remaining = length - (end_ptr - str_start); 2052 if (remaining < 0) 2053 return -EINVAL; 2054 2055 for (i = 0; i < remaining; i++) { 2056 switch (end_ptr[i]) { 2057 case 'M': 2058 cvt = true; 2059 break; 2060 case 'R': 2061 rb = true; 2062 break; 2063 default: 2064 /* 2065 * Try to pass that to our extras parsing 2066 * function to handle the case where the 2067 * extras are directly after the resolution 2068 */ 2069 if (extras) { 2070 int ret = drm_mode_parse_cmdline_extra(end_ptr + i, 2071 1, 2072 false, 2073 connector, 2074 mode); 2075 if (ret) 2076 return ret; 2077 } else { 2078 return -EINVAL; 2079 } 2080 } 2081 } 2082 2083 mode->xres = xres; 2084 mode->yres = yres; 2085 mode->cvt = cvt; 2086 mode->rb = rb; 2087 2088 return 0; 2089} 2090 2091static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret) 2092{ 2093 const char *value; 2094 char *endp; 2095 2096 /* 2097 * delim must point to the '=', otherwise it is a syntax error and 2098 * if delim points to the terminating zero, then delim + 1 will point 2099 * past the end of the string. 2100 */ 2101 if (*delim != '=') 2102 return -EINVAL; 2103 2104 value = delim + 1; 2105 *int_ret = simple_strtol(value, &endp, 10); 2106 2107 /* Make sure we have parsed something */ 2108 if (endp == value) 2109 return -EINVAL; 2110 2111 return 0; 2112} 2113 2114static int drm_mode_parse_panel_orientation(const char *delim, 2115 struct drm_cmdline_mode *mode) 2116{ 2117 const char *value; 2118 2119 if (*delim != '=') 2120 return -EINVAL; 2121 2122 value = delim + 1; 2123 delim = strchr(value, ','); 2124 if (!delim) 2125 delim = value + strlen(value); 2126 2127 if (!strncmp(value, "normal", delim - value)) 2128 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL; 2129 else if (!strncmp(value, "upside_down", delim - value)) 2130 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP; 2131 else if (!strncmp(value, "left_side_up", delim - value)) 2132 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP; 2133 else if (!strncmp(value, "right_side_up", delim - value)) 2134 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP; 2135 else 2136 return -EINVAL; 2137 2138 return 0; 2139} 2140 2141static int drm_mode_parse_tv_mode(const char *delim, 2142 struct drm_cmdline_mode *mode) 2143{ 2144 const char *value; 2145 int ret; 2146 2147 if (*delim != '=') 2148 return -EINVAL; 2149 2150 value = delim + 1; 2151 delim = strchr(value, ','); 2152 if (!delim) 2153 delim = value + strlen(value); 2154 2155 ret = drm_get_tv_mode_from_name(value, delim - value); 2156 if (ret < 0) 2157 return ret; 2158 2159 mode->tv_mode_specified = true; 2160 mode->tv_mode = ret; 2161 2162 return 0; 2163} 2164 2165static int drm_mode_parse_cmdline_options(const char *str, 2166 bool freestanding, 2167 const struct drm_connector *connector, 2168 struct drm_cmdline_mode *mode) 2169{ 2170 unsigned int deg, margin, rotation = 0; 2171 const char *delim, *option, *sep; 2172 2173 option = str; 2174 do { 2175 delim = strchr(option, '='); 2176 if (!delim) { 2177 delim = strchr(option, ','); 2178 2179 if (!delim) 2180 delim = option + strlen(option); 2181 } 2182 2183 if (!strncmp(option, "rotate", delim - option)) { 2184 if (drm_mode_parse_cmdline_int(delim, °)) 2185 return -EINVAL; 2186 2187 switch (deg) { 2188 case 0: 2189 rotation |= DRM_MODE_ROTATE_0; 2190 break; 2191 2192 case 90: 2193 rotation |= DRM_MODE_ROTATE_90; 2194 break; 2195 2196 case 180: 2197 rotation |= DRM_MODE_ROTATE_180; 2198 break; 2199 2200 case 270: 2201 rotation |= DRM_MODE_ROTATE_270; 2202 break; 2203 2204 default: 2205 return -EINVAL; 2206 } 2207 } else if (!strncmp(option, "reflect_x", delim - option)) { 2208 rotation |= DRM_MODE_REFLECT_X; 2209 } else if (!strncmp(option, "reflect_y", delim - option)) { 2210 rotation |= DRM_MODE_REFLECT_Y; 2211 } else if (!strncmp(option, "margin_right", delim - option)) { 2212 if (drm_mode_parse_cmdline_int(delim, &margin)) 2213 return -EINVAL; 2214 2215 mode->tv_margins.right = margin; 2216 } else if (!strncmp(option, "margin_left", delim - option)) { 2217 if (drm_mode_parse_cmdline_int(delim, &margin)) 2218 return -EINVAL; 2219 2220 mode->tv_margins.left = margin; 2221 } else if (!strncmp(option, "margin_top", delim - option)) { 2222 if (drm_mode_parse_cmdline_int(delim, &margin)) 2223 return -EINVAL; 2224 2225 mode->tv_margins.top = margin; 2226 } else if (!strncmp(option, "margin_bottom", delim - option)) { 2227 if (drm_mode_parse_cmdline_int(delim, &margin)) 2228 return -EINVAL; 2229 2230 mode->tv_margins.bottom = margin; 2231 } else if (!strncmp(option, "panel_orientation", delim - option)) { 2232 if (drm_mode_parse_panel_orientation(delim, mode)) 2233 return -EINVAL; 2234 } else if (!strncmp(option, "tv_mode", delim - option)) { 2235 if (drm_mode_parse_tv_mode(delim, mode)) 2236 return -EINVAL; 2237 } else { 2238 return -EINVAL; 2239 } 2240 sep = strchr(delim, ','); 2241 option = sep + 1; 2242 } while (sep); 2243 2244 if (rotation && freestanding) 2245 return -EINVAL; 2246 2247 if (!(rotation & DRM_MODE_ROTATE_MASK)) 2248 rotation |= DRM_MODE_ROTATE_0; 2249 2250 /* Make sure there is exactly one rotation defined */ 2251 if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK)) 2252 return -EINVAL; 2253 2254 mode->rotation_reflection = rotation; 2255 2256 return 0; 2257} 2258 2259struct drm_named_mode { 2260 const char *name; 2261 unsigned int pixel_clock_khz; 2262 unsigned int xres; 2263 unsigned int yres; 2264 unsigned int flags; 2265 unsigned int tv_mode; 2266}; 2267 2268#define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode) \ 2269 { \ 2270 .name = _name, \ 2271 .pixel_clock_khz = _pclk, \ 2272 .xres = _x, \ 2273 .yres = _y, \ 2274 .flags = _flags, \ 2275 .tv_mode = _mode, \ 2276 } 2277 2278static const struct drm_named_mode drm_named_modes[] = { 2279 NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC), 2280 NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J), 2281 NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL), 2282 NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M), 2283}; 2284 2285static int drm_mode_parse_cmdline_named_mode(const char *name, 2286 unsigned int name_end, 2287 struct drm_cmdline_mode *cmdline_mode) 2288{ 2289 unsigned int i; 2290 2291 if (!name_end) 2292 return 0; 2293 2294 /* If the name starts with a digit, it's not a named mode */ 2295 if (isdigit(name[0])) 2296 return 0; 2297 2298 /* 2299 * If there's an equal sign in the name, the command-line 2300 * contains only an option and no mode. 2301 */ 2302 if (strnchr(name, name_end, '=')) 2303 return 0; 2304 2305 /* The connection status extras can be set without a mode. */ 2306 if (name_end == 1 && 2307 (name[0] == 'd' || name[0] == 'D' || name[0] == 'e')) 2308 return 0; 2309 2310 /* 2311 * We're sure we're a named mode at this point, iterate over the 2312 * list of modes we're aware of. 2313 */ 2314 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) { 2315 const struct drm_named_mode *mode = &drm_named_modes[i]; 2316 int ret; 2317 2318 ret = str_has_prefix(name, mode->name); 2319 if (ret != name_end) 2320 continue; 2321 2322 strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name)); 2323 cmdline_mode->pixel_clock = mode->pixel_clock_khz; 2324 cmdline_mode->xres = mode->xres; 2325 cmdline_mode->yres = mode->yres; 2326 cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 2327 cmdline_mode->tv_mode = mode->tv_mode; 2328 cmdline_mode->tv_mode_specified = true; 2329 cmdline_mode->specified = true; 2330 2331 return 1; 2332 } 2333 2334 return -EINVAL; 2335} 2336 2337/** 2338 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector 2339 * @mode_option: optional per connector mode option 2340 * @connector: connector to parse modeline for 2341 * @mode: preallocated drm_cmdline_mode structure to fill out 2342 * 2343 * This parses @mode_option command line modeline for modes and options to 2344 * configure the connector. 2345 * 2346 * This uses the same parameters as the fb modedb.c, except for an extra 2347 * force-enable, force-enable-digital and force-disable bit at the end:: 2348 * 2349 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd] 2350 * 2351 * Additionals options can be provided following the mode, using a comma to 2352 * separate each option. Valid options can be found in 2353 * Documentation/fb/modedb.rst. 2354 * 2355 * The intermediate drm_cmdline_mode structure is required to store additional 2356 * options from the command line modline like the force-enable/disable flag. 2357 * 2358 * Returns: 2359 * True if a valid modeline has been parsed, false otherwise. 2360 */ 2361bool drm_mode_parse_command_line_for_connector(const char *mode_option, 2362 const struct drm_connector *connector, 2363 struct drm_cmdline_mode *mode) 2364{ 2365 const char *name; 2366 bool freestanding = false, parse_extras = false; 2367 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0; 2368 unsigned int mode_end = 0; 2369 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL; 2370 const char *options_ptr = NULL; 2371 char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL; 2372 int len, ret; 2373 2374 memset(mode, 0, sizeof(*mode)); 2375 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN; 2376 2377 if (!mode_option) 2378 return false; 2379 2380 name = mode_option; 2381 2382 /* Locate the start of named options */ 2383 options_ptr = strchr(name, ','); 2384 if (options_ptr) 2385 options_off = options_ptr - name; 2386 else 2387 options_off = strlen(name); 2388 2389 /* Try to locate the bpp and refresh specifiers, if any */ 2390 bpp_ptr = strnchr(name, options_off, '-'); 2391 while (bpp_ptr && !isdigit(bpp_ptr[1])) 2392 bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-'); 2393 if (bpp_ptr) 2394 bpp_off = bpp_ptr - name; 2395 2396 refresh_ptr = strnchr(name, options_off, '@'); 2397 if (refresh_ptr) 2398 refresh_off = refresh_ptr - name; 2399 2400 /* Locate the end of the name / resolution, and parse it */ 2401 if (bpp_ptr) { 2402 mode_end = bpp_off; 2403 } else if (refresh_ptr) { 2404 mode_end = refresh_off; 2405 } else if (options_ptr) { 2406 mode_end = options_off; 2407 parse_extras = true; 2408 } else { 2409 mode_end = strlen(name); 2410 parse_extras = true; 2411 } 2412 2413 if (!mode_end) 2414 return false; 2415 2416 ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode); 2417 if (ret < 0) 2418 return false; 2419 2420 /* 2421 * Having a mode that starts by a letter (and thus is named) and 2422 * an at-sign (used to specify a refresh rate) is disallowed. 2423 */ 2424 if (ret && refresh_ptr) 2425 return false; 2426 2427 /* No named mode? Check for a normal mode argument, e.g. 1024x768 */ 2428 if (!mode->specified && isdigit(name[0])) { 2429 ret = drm_mode_parse_cmdline_res_mode(name, mode_end, 2430 parse_extras, 2431 connector, 2432 mode); 2433 if (ret) 2434 return false; 2435 2436 mode->specified = true; 2437 } 2438 2439 /* No mode? Check for freestanding extras and/or options */ 2440 if (!mode->specified) { 2441 unsigned int len = strlen(mode_option); 2442 2443 if (bpp_ptr || refresh_ptr) 2444 return false; /* syntax error */ 2445 2446 if (len == 1 || (len >= 2 && mode_option[1] == ',')) 2447 extra_ptr = mode_option; 2448 else 2449 options_ptr = mode_option - 1; 2450 2451 freestanding = true; 2452 } 2453 2454 if (bpp_ptr) { 2455 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode); 2456 if (ret) 2457 return false; 2458 2459 mode->bpp_specified = true; 2460 } 2461 2462 if (refresh_ptr) { 2463 ret = drm_mode_parse_cmdline_refresh(refresh_ptr, 2464 &refresh_end_ptr, mode); 2465 if (ret) 2466 return false; 2467 2468 mode->refresh_specified = true; 2469 } 2470 2471 /* 2472 * Locate the end of the bpp / refresh, and parse the extras 2473 * if relevant 2474 */ 2475 if (bpp_ptr && refresh_ptr) 2476 extra_ptr = max(bpp_end_ptr, refresh_end_ptr); 2477 else if (bpp_ptr) 2478 extra_ptr = bpp_end_ptr; 2479 else if (refresh_ptr) 2480 extra_ptr = refresh_end_ptr; 2481 2482 if (extra_ptr) { 2483 if (options_ptr) 2484 len = options_ptr - extra_ptr; 2485 else 2486 len = strlen(extra_ptr); 2487 2488 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding, 2489 connector, mode); 2490 if (ret) 2491 return false; 2492 } 2493 2494 if (options_ptr) { 2495 ret = drm_mode_parse_cmdline_options(options_ptr + 1, 2496 freestanding, 2497 connector, mode); 2498 if (ret) 2499 return false; 2500 } 2501 2502 return true; 2503} 2504EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector); 2505 2506static struct drm_display_mode *drm_named_mode(struct drm_device *dev, 2507 struct drm_cmdline_mode *cmd) 2508{ 2509 unsigned int i; 2510 2511 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) { 2512 const struct drm_named_mode *named_mode = &drm_named_modes[i]; 2513 2514 if (strcmp(cmd->name, named_mode->name)) 2515 continue; 2516 2517 if (!cmd->tv_mode_specified) 2518 continue; 2519 2520 return drm_analog_tv_mode(dev, 2521 named_mode->tv_mode, 2522 named_mode->pixel_clock_khz * 1000, 2523 named_mode->xres, 2524 named_mode->yres, 2525 named_mode->flags & DRM_MODE_FLAG_INTERLACE); 2526 } 2527 2528 return NULL; 2529} 2530 2531/** 2532 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode 2533 * @dev: DRM device to create the new mode for 2534 * @cmd: input command line modeline 2535 * 2536 * Returns: 2537 * Pointer to converted mode on success, NULL on error. 2538 */ 2539struct drm_display_mode * 2540drm_mode_create_from_cmdline_mode(struct drm_device *dev, 2541 struct drm_cmdline_mode *cmd) 2542{ 2543 struct drm_display_mode *mode; 2544 2545 if (cmd->xres == 0 || cmd->yres == 0) 2546 return NULL; 2547 2548 if (strlen(cmd->name)) 2549 mode = drm_named_mode(dev, cmd); 2550 else if (cmd->cvt) 2551 mode = drm_cvt_mode(dev, 2552 cmd->xres, cmd->yres, 2553 cmd->refresh_specified ? cmd->refresh : 60, 2554 cmd->rb, cmd->interlace, 2555 cmd->margins); 2556 else 2557 mode = drm_gtf_mode(dev, 2558 cmd->xres, cmd->yres, 2559 cmd->refresh_specified ? cmd->refresh : 60, 2560 cmd->interlace, 2561 cmd->margins); 2562 if (!mode) 2563 return NULL; 2564 2565 mode->type |= DRM_MODE_TYPE_USERDEF; 2566 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */ 2567 if (cmd->xres == 1366) 2568 drm_mode_fixup_1366x768(mode); 2569 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); 2570 return mode; 2571} 2572EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode); 2573 2574/** 2575 * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo 2576 * @out: drm_mode_modeinfo struct to return to the user 2577 * @in: drm_display_mode to use 2578 * 2579 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to 2580 * the user. 2581 */ 2582void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out, 2583 const struct drm_display_mode *in) 2584{ 2585 out->clock = in->clock; 2586 out->hdisplay = in->hdisplay; 2587 out->hsync_start = in->hsync_start; 2588 out->hsync_end = in->hsync_end; 2589 out->htotal = in->htotal; 2590 out->hskew = in->hskew; 2591 out->vdisplay = in->vdisplay; 2592 out->vsync_start = in->vsync_start; 2593 out->vsync_end = in->vsync_end; 2594 out->vtotal = in->vtotal; 2595 out->vscan = in->vscan; 2596 out->vrefresh = drm_mode_vrefresh(in); 2597 out->flags = in->flags; 2598 out->type = in->type; 2599 2600 switch (in->picture_aspect_ratio) { 2601 case HDMI_PICTURE_ASPECT_4_3: 2602 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3; 2603 break; 2604 case HDMI_PICTURE_ASPECT_16_9: 2605 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9; 2606 break; 2607 case HDMI_PICTURE_ASPECT_64_27: 2608 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27; 2609 break; 2610 case HDMI_PICTURE_ASPECT_256_135: 2611 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135; 2612 break; 2613 default: 2614 WARN(1, "Invalid aspect ratio (0%x) on mode\n", 2615 in->picture_aspect_ratio); 2616 fallthrough; 2617 case HDMI_PICTURE_ASPECT_NONE: 2618 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE; 2619 break; 2620 } 2621 2622 strscpy_pad(out->name, in->name, sizeof(out->name)); 2623} 2624 2625/** 2626 * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode 2627 * @dev: drm device 2628 * @out: drm_display_mode to return to the user 2629 * @in: drm_mode_modeinfo to use 2630 * 2631 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to 2632 * the caller. 2633 * 2634 * Returns: 2635 * Zero on success, negative errno on failure. 2636 */ 2637int drm_mode_convert_umode(struct drm_device *dev, 2638 struct drm_display_mode *out, 2639 const struct drm_mode_modeinfo *in) 2640{ 2641 if (in->clock > INT_MAX || in->vrefresh > INT_MAX) 2642 return -ERANGE; 2643 2644 out->clock = in->clock; 2645 out->hdisplay = in->hdisplay; 2646 out->hsync_start = in->hsync_start; 2647 out->hsync_end = in->hsync_end; 2648 out->htotal = in->htotal; 2649 out->hskew = in->hskew; 2650 out->vdisplay = in->vdisplay; 2651 out->vsync_start = in->vsync_start; 2652 out->vsync_end = in->vsync_end; 2653 out->vtotal = in->vtotal; 2654 out->vscan = in->vscan; 2655 out->flags = in->flags; 2656 /* 2657 * Old xf86-video-vmware (possibly others too) used to 2658 * leave 'type' uninitialized. Just ignore any bits we 2659 * don't like. It's a just hint after all, and more 2660 * useful for the kernel->userspace direction anyway. 2661 */ 2662 out->type = in->type & DRM_MODE_TYPE_ALL; 2663 strscpy_pad(out->name, in->name, sizeof(out->name)); 2664 2665 /* Clearing picture aspect ratio bits from out flags, 2666 * as the aspect-ratio information is not stored in 2667 * flags for kernel-mode, but in picture_aspect_ratio. 2668 */ 2669 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK; 2670 2671 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) { 2672 case DRM_MODE_FLAG_PIC_AR_4_3: 2673 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3; 2674 break; 2675 case DRM_MODE_FLAG_PIC_AR_16_9: 2676 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9; 2677 break; 2678 case DRM_MODE_FLAG_PIC_AR_64_27: 2679 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27; 2680 break; 2681 case DRM_MODE_FLAG_PIC_AR_256_135: 2682 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135; 2683 break; 2684 case DRM_MODE_FLAG_PIC_AR_NONE: 2685 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE; 2686 break; 2687 default: 2688 return -EINVAL; 2689 } 2690 2691 out->status = drm_mode_validate_driver(dev, out); 2692 if (out->status != MODE_OK) 2693 return -EINVAL; 2694 2695 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V); 2696 2697 return 0; 2698} 2699 2700/** 2701 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420 2702 * output format 2703 * 2704 * @display: display under action 2705 * @mode: video mode to be tested. 2706 * 2707 * Returns: 2708 * true if the mode can be supported in YCBCR420 format 2709 * false if not. 2710 */ 2711bool drm_mode_is_420_only(const struct drm_display_info *display, 2712 const struct drm_display_mode *mode) 2713{ 2714 u8 vic = drm_match_cea_mode(mode); 2715 2716 return test_bit(vic, display->hdmi.y420_vdb_modes); 2717} 2718EXPORT_SYMBOL(drm_mode_is_420_only); 2719 2720/** 2721 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420 2722 * output format also (along with RGB/YCBCR444/422) 2723 * 2724 * @display: display under action. 2725 * @mode: video mode to be tested. 2726 * 2727 * Returns: 2728 * true if the mode can be support YCBCR420 format 2729 * false if not. 2730 */ 2731bool drm_mode_is_420_also(const struct drm_display_info *display, 2732 const struct drm_display_mode *mode) 2733{ 2734 u8 vic = drm_match_cea_mode(mode); 2735 2736 return test_bit(vic, display->hdmi.y420_cmdb_modes); 2737} 2738EXPORT_SYMBOL(drm_mode_is_420_also); 2739/** 2740 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420 2741 * output format 2742 * 2743 * @display: display under action. 2744 * @mode: video mode to be tested. 2745 * 2746 * Returns: 2747 * true if the mode can be supported in YCBCR420 format 2748 * false if not. 2749 */ 2750bool drm_mode_is_420(const struct drm_display_info *display, 2751 const struct drm_display_mode *mode) 2752{ 2753 return drm_mode_is_420_only(display, mode) || 2754 drm_mode_is_420_also(display, mode); 2755} 2756EXPORT_SYMBOL(drm_mode_is_420); 2757 2758/** 2759 * drm_set_preferred_mode - Sets the preferred mode of a connector 2760 * @connector: connector whose mode list should be processed 2761 * @hpref: horizontal resolution of preferred mode 2762 * @vpref: vertical resolution of preferred mode 2763 * 2764 * Marks a mode as preferred if it matches the resolution specified by @hpref 2765 * and @vpref. 2766 */ 2767void drm_set_preferred_mode(struct drm_connector *connector, 2768 int hpref, int vpref) 2769{ 2770 struct drm_display_mode *mode; 2771 2772 list_for_each_entry(mode, &connector->probed_modes, head) { 2773 if (mode->hdisplay == hpref && 2774 mode->vdisplay == vpref) 2775 mode->type |= DRM_MODE_TYPE_PREFERRED; 2776 } 2777} 2778EXPORT_SYMBOL(drm_set_preferred_mode);
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