1 /* 2 * Copyright (c) 2006 Luc Verhaegen (quirks list) 3 * Copyright (c) 2007-2008 Intel Corporation 4 * Jesse Barnes <jesse.barnes@intel.com> 5 * 6 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from 7 * FB layer. 8 * Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com> 9 * 10 * Permission is hereby granted, free of charge, to any person obtaining a 11 * copy of this software and associated documentation files (the "Software"), 12 * to deal in the Software without restriction, including without limitation 13 * the rights to use, copy, modify, merge, publish, distribute, sub license, 14 * and/or sell copies of the Software, and to permit persons to whom the 15 * Software is furnished to do so, subject to the following conditions: 16 * 17 * The above copyright notice and this permission notice (including the 18 * next paragraph) shall be included in all copies or substantial portions 19 * of the Software. 20 * 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 27 * DEALINGS IN THE SOFTWARE. 28 */ 29 #include <linux/kernel.h> 30 #include <linux/i2c.h> 31 #include <linux/i2c-algo-bit.h> 32 #include "drmP.h" 33 #include "drm_edid.h" 34 35 /* 36 * TODO: 37 * - support EDID 1.4 (incl. CE blocks) 38 */ 39 40 /* 41 * EDID blocks out in the wild have a variety of bugs, try to collect 42 * them here (note that userspace may work around broken monitors first, 43 * but fixes should make their way here so that the kernel "just works" 44 * on as many displays as possible). 45 */ 46 47 /* First detailed mode wrong, use largest 60Hz mode */ 48 #define EDID_QUIRK_PREFER_LARGE_60 (1 << 0) 49 /* Reported 135MHz pixel clock is too high, needs adjustment */ 50 #define EDID_QUIRK_135_CLOCK_TOO_HIGH (1 << 1) 51 /* Prefer the largest mode at 75 Hz */ 52 #define EDID_QUIRK_PREFER_LARGE_75 (1 << 2) 53 /* Detail timing is in cm not mm */ 54 #define EDID_QUIRK_DETAILED_IN_CM (1 << 3) 55 /* Detailed timing descriptors have bogus size values, so just take the 56 * maximum size and use that. 57 */ 58 #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE (1 << 4) 59 /* Monitor forgot to set the first detailed is preferred bit. */ 60 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5) 61 /* use +hsync +vsync for detailed mode */ 62 #define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6) 63 64 static struct edid_quirk { 65 char *vendor; 66 int product_id; 67 u32 quirks; 68 } edid_quirk_list[] = { 69 /* Acer AL1706 */ 70 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 71 /* Acer F51 */ 72 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 73 /* Unknown Acer */ 74 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 75 76 /* Belinea 10 15 55 */ 77 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 78 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 79 80 /* Envision Peripherals, Inc. EN-7100e */ 81 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 82 83 /* Funai Electronics PM36B */ 84 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 85 EDID_QUIRK_DETAILED_IN_CM }, 86 87 /* LG Philips LCD LP154W01-A5 */ 88 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 89 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 90 91 /* Philips 107p5 CRT */ 92 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 93 94 /* Proview AY765C */ 95 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 96 97 /* Samsung SyncMaster 205BW. Note: irony */ 98 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 99 /* Samsung SyncMaster 22[5-6]BW */ 100 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 101 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 102 }; 103 104 105 /* Valid EDID header has these bytes */ 106 static u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 }; 107 108 /** 109 * edid_is_valid - sanity check EDID data 110 * @edid: EDID data 111 * 112 * Sanity check the EDID block by looking at the header, the version number 113 * and the checksum. Return 0 if the EDID doesn't check out, or 1 if it's 114 * valid. 115 */ 116 static bool edid_is_valid(struct edid *edid) 117 { 118 int i; 119 u8 csum = 0; 120 u8 *raw_edid = (u8 *)edid; 121 122 if (memcmp(edid->header, edid_header, sizeof(edid_header))) 123 goto bad; 124 if (edid->version != 1) { 125 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 126 goto bad; 127 } 128 if (edid->revision > 4) 129 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 130 131 for (i = 0; i < EDID_LENGTH; i++) 132 csum += raw_edid[i]; 133 if (csum) { 134 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 135 goto bad; 136 } 137 138 return 1; 139 140 bad: 141 if (raw_edid) { 142 DRM_ERROR("Raw EDID:\n"); 143 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH); 144 printk("\n"); 145 } 146 return 0; 147 } 148 149 /** 150 * edid_vendor - match a string against EDID's obfuscated vendor field 151 * @edid: EDID to match 152 * @vendor: vendor string 153 * 154 * Returns true if @vendor is in @edid, false otherwise 155 */ 156 static bool edid_vendor(struct edid *edid, char *vendor) 157 { 158 char edid_vendor[3]; 159 160 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 161 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 162 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 163 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 164 165 return !strncmp(edid_vendor, vendor, 3); 166 } 167 168 /** 169 * edid_get_quirks - return quirk flags for a given EDID 170 * @edid: EDID to process 171 * 172 * This tells subsequent routines what fixes they need to apply. 173 */ 174 static u32 edid_get_quirks(struct edid *edid) 175 { 176 struct edid_quirk *quirk; 177 int i; 178 179 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 180 quirk = &edid_quirk_list[i]; 181 182 if (edid_vendor(edid, quirk->vendor) && 183 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 184 return quirk->quirks; 185 } 186 187 return 0; 188 } 189 190 #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 191 #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 192 193 194 /** 195 * edid_fixup_preferred - set preferred modes based on quirk list 196 * @connector: has mode list to fix up 197 * @quirks: quirks list 198 * 199 * Walk the mode list for @connector, clearing the preferred status 200 * on existing modes and setting it anew for the right mode ala @quirks. 201 */ 202 static void edid_fixup_preferred(struct drm_connector *connector, 203 u32 quirks) 204 { 205 struct drm_display_mode *t, *cur_mode, *preferred_mode; 206 int target_refresh = 0; 207 208 if (list_empty(&connector->probed_modes)) 209 return; 210 211 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 212 target_refresh = 60; 213 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 214 target_refresh = 75; 215 216 preferred_mode = list_first_entry(&connector->probed_modes, 217 struct drm_display_mode, head); 218 219 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 220 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 221 222 if (cur_mode == preferred_mode) 223 continue; 224 225 /* Largest mode is preferred */ 226 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 227 preferred_mode = cur_mode; 228 229 /* At a given size, try to get closest to target refresh */ 230 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 231 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 232 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 233 preferred_mode = cur_mode; 234 } 235 } 236 237 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 238 } 239 240 /** 241 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 242 * @t: standard timing params 243 * 244 * Take the standard timing params (in this case width, aspect, and refresh) 245 * and convert them into a real mode using CVT. 246 * 247 * Punts for now, but should eventually use the FB layer's CVT based mode 248 * generation code. 249 */ 250 struct drm_display_mode *drm_mode_std(struct drm_device *dev, 251 struct std_timing *t) 252 { 253 struct drm_display_mode *mode; 254 int hsize = t->hsize * 8 + 248, vsize; 255 256 mode = drm_mode_create(dev); 257 if (!mode) 258 return NULL; 259 260 if (t->aspect_ratio == 0) 261 vsize = (hsize * 10) / 16; 262 else if (t->aspect_ratio == 1) 263 vsize = (hsize * 3) / 4; 264 else if (t->aspect_ratio == 2) 265 vsize = (hsize * 4) / 5; 266 else 267 vsize = (hsize * 9) / 16; 268 269 drm_mode_set_name(mode); 270 271 return mode; 272 } 273 274 /** 275 * drm_mode_detailed - create a new mode from an EDID detailed timing section 276 * @dev: DRM device (needed to create new mode) 277 * @edid: EDID block 278 * @timing: EDID detailed timing info 279 * @quirks: quirks to apply 280 * 281 * An EDID detailed timing block contains enough info for us to create and 282 * return a new struct drm_display_mode. 283 */ 284 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 285 struct edid *edid, 286 struct detailed_timing *timing, 287 u32 quirks) 288 { 289 struct drm_display_mode *mode; 290 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 291 292 /* ignore tiny modes */ 293 if (((pt->hactive_hi << 8) | pt->hactive_lo) < 64 || 294 ((pt->vactive_hi << 8) | pt->hactive_lo) < 64) 295 return NULL; 296 297 if (pt->stereo) { 298 printk(KERN_WARNING "stereo mode not supported\n"); 299 return NULL; 300 } 301 if (!pt->separate_sync) { 302 printk(KERN_WARNING "integrated sync not supported\n"); 303 return NULL; 304 } 305 306 mode = drm_mode_create(dev); 307 if (!mode) 308 return NULL; 309 310 mode->type = DRM_MODE_TYPE_DRIVER; 311 312 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 313 timing->pixel_clock = 1088; 314 315 mode->clock = timing->pixel_clock * 10; 316 317 mode->hdisplay = (pt->hactive_hi << 8) | pt->hactive_lo; 318 mode->hsync_start = mode->hdisplay + ((pt->hsync_offset_hi << 8) | 319 pt->hsync_offset_lo); 320 mode->hsync_end = mode->hsync_start + 321 ((pt->hsync_pulse_width_hi << 8) | 322 pt->hsync_pulse_width_lo); 323 mode->htotal = mode->hdisplay + ((pt->hblank_hi << 8) | pt->hblank_lo); 324 325 mode->vdisplay = (pt->vactive_hi << 8) | pt->vactive_lo; 326 mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 4) | 327 pt->vsync_offset_lo); 328 mode->vsync_end = mode->vsync_start + 329 ((pt->vsync_pulse_width_hi << 4) | 330 pt->vsync_pulse_width_lo); 331 mode->vtotal = mode->vdisplay + ((pt->vblank_hi << 8) | pt->vblank_lo); 332 333 drm_mode_set_name(mode); 334 335 if (pt->interlaced) 336 mode->flags |= DRM_MODE_FLAG_INTERLACE; 337 338 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 339 pt->hsync_positive = 1; 340 pt->vsync_positive = 1; 341 } 342 343 mode->flags |= pt->hsync_positive ? DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 344 mode->flags |= pt->vsync_positive ? DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 345 346 mode->width_mm = pt->width_mm_lo | (pt->width_mm_hi << 8); 347 mode->height_mm = pt->height_mm_lo | (pt->height_mm_hi << 8); 348 349 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 350 mode->width_mm *= 10; 351 mode->height_mm *= 10; 352 } 353 354 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 355 mode->width_mm = edid->width_cm * 10; 356 mode->height_mm = edid->height_cm * 10; 357 } 358 359 return mode; 360 } 361 362 /* 363 * Detailed mode info for the EDID "established modes" data to use. 364 */ 365 static struct drm_display_mode edid_est_modes[] = { 366 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840, 367 968, 1056, 0, 600, 601, 605, 628, 0, 368 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */ 369 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824, 370 896, 1024, 0, 600, 601, 603, 625, 0, 371 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */ 372 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656, 373 720, 840, 0, 480, 481, 484, 500, 0, 374 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */ 375 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664, 376 704, 832, 0, 480, 489, 491, 520, 0, 377 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */ 378 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704, 379 768, 864, 0, 480, 483, 486, 525, 0, 380 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */ 381 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656, 382 752, 800, 0, 480, 490, 492, 525, 0, 383 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */ 384 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738, 385 846, 900, 0, 400, 421, 423, 449, 0, 386 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */ 387 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738, 388 846, 900, 0, 400, 412, 414, 449, 0, 389 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */ 390 { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296, 391 1440, 1688, 0, 1024, 1025, 1028, 1066, 0, 392 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */ 393 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040, 394 1136, 1312, 0, 768, 769, 772, 800, 0, 395 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */ 396 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048, 397 1184, 1328, 0, 768, 771, 777, 806, 0, 398 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */ 399 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048, 400 1184, 1344, 0, 768, 771, 777, 806, 0, 401 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */ 402 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032, 403 1208, 1264, 0, 768, 768, 776, 817, 0, 404 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */ 405 { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864, 406 928, 1152, 0, 624, 625, 628, 667, 0, 407 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */ 408 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816, 409 896, 1056, 0, 600, 601, 604, 625, 0, 410 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */ 411 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856, 412 976, 1040, 0, 600, 637, 643, 666, 0, 413 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */ 414 { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216, 415 1344, 1600, 0, 864, 865, 868, 900, 0, 416 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */ 417 }; 418 419 #define EDID_EST_TIMINGS 16 420 #define EDID_STD_TIMINGS 8 421 #define EDID_DETAILED_TIMINGS 4 422 423 /** 424 * add_established_modes - get est. modes from EDID and add them 425 * @edid: EDID block to scan 426 * 427 * Each EDID block contains a bitmap of the supported "established modes" list 428 * (defined above). Tease them out and add them to the global modes list. 429 */ 430 static int add_established_modes(struct drm_connector *connector, struct edid *edid) 431 { 432 struct drm_device *dev = connector->dev; 433 unsigned long est_bits = edid->established_timings.t1 | 434 (edid->established_timings.t2 << 8) | 435 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 436 int i, modes = 0; 437 438 for (i = 0; i <= EDID_EST_TIMINGS; i++) 439 if (est_bits & (1<<i)) { 440 struct drm_display_mode *newmode; 441 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 442 if (newmode) { 443 drm_mode_probed_add(connector, newmode); 444 modes++; 445 } 446 } 447 448 return modes; 449 } 450 451 /** 452 * add_standard_modes - get std. modes from EDID and add them 453 * @edid: EDID block to scan 454 * 455 * Standard modes can be calculated using the CVT standard. Grab them from 456 * @edid, calculate them, and add them to the list. 457 */ 458 static int add_standard_modes(struct drm_connector *connector, struct edid *edid) 459 { 460 struct drm_device *dev = connector->dev; 461 int i, modes = 0; 462 463 for (i = 0; i < EDID_STD_TIMINGS; i++) { 464 struct std_timing *t = &edid->standard_timings[i]; 465 struct drm_display_mode *newmode; 466 467 /* If std timings bytes are 1, 1 it's empty */ 468 if (t->hsize == 1 && (t->aspect_ratio | t->vfreq) == 1) 469 continue; 470 471 newmode = drm_mode_std(dev, &edid->standard_timings[i]); 472 if (newmode) { 473 drm_mode_probed_add(connector, newmode); 474 modes++; 475 } 476 } 477 478 return modes; 479 } 480 481 /** 482 * add_detailed_modes - get detailed mode info from EDID data 483 * @connector: attached connector 484 * @edid: EDID block to scan 485 * @quirks: quirks to apply 486 * 487 * Some of the detailed timing sections may contain mode information. Grab 488 * it and add it to the list. 489 */ 490 static int add_detailed_info(struct drm_connector *connector, 491 struct edid *edid, u32 quirks) 492 { 493 struct drm_device *dev = connector->dev; 494 int i, j, modes = 0; 495 496 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) { 497 struct detailed_timing *timing = &edid->detailed_timings[i]; 498 struct detailed_non_pixel *data = &timing->data.other_data; 499 struct drm_display_mode *newmode; 500 501 /* EDID up to and including 1.2 may put monitor info here */ 502 if (edid->version == 1 && edid->revision < 3) 503 continue; 504 505 /* Detailed mode timing */ 506 if (timing->pixel_clock) { 507 newmode = drm_mode_detailed(dev, edid, timing, quirks); 508 if (!newmode) 509 continue; 510 511 /* First detailed mode is preferred */ 512 if (i == 0 && edid->preferred_timing) 513 newmode->type |= DRM_MODE_TYPE_PREFERRED; 514 drm_mode_probed_add(connector, newmode); 515 516 modes++; 517 continue; 518 } 519 520 /* Other timing or info */ 521 switch (data->type) { 522 case EDID_DETAIL_MONITOR_SERIAL: 523 break; 524 case EDID_DETAIL_MONITOR_STRING: 525 break; 526 case EDID_DETAIL_MONITOR_RANGE: 527 /* Get monitor range data */ 528 break; 529 case EDID_DETAIL_MONITOR_NAME: 530 break; 531 case EDID_DETAIL_MONITOR_CPDATA: 532 break; 533 case EDID_DETAIL_STD_MODES: 534 /* Five modes per detailed section */ 535 for (j = 0; j < 5; i++) { 536 struct std_timing *std; 537 struct drm_display_mode *newmode; 538 539 std = &data->data.timings[j]; 540 newmode = drm_mode_std(dev, std); 541 if (newmode) { 542 drm_mode_probed_add(connector, newmode); 543 modes++; 544 } 545 } 546 break; 547 default: 548 break; 549 } 550 } 551 552 return modes; 553 } 554 555 #define DDC_ADDR 0x50 556 /** 557 * Get EDID information via I2C. 558 * 559 * \param adapter : i2c device adaptor 560 * \param buf : EDID data buffer to be filled 561 * \param len : EDID data buffer length 562 * \return 0 on success or -1 on failure. 563 * 564 * Try to fetch EDID information by calling i2c driver function. 565 */ 566 int drm_do_probe_ddc_edid(struct i2c_adapter *adapter, 567 unsigned char *buf, int len) 568 { 569 unsigned char start = 0x0; 570 struct i2c_msg msgs[] = { 571 { 572 .addr = DDC_ADDR, 573 .flags = 0, 574 .len = 1, 575 .buf = &start, 576 }, { 577 .addr = DDC_ADDR, 578 .flags = I2C_M_RD, 579 .len = len, 580 .buf = buf, 581 } 582 }; 583 584 if (i2c_transfer(adapter, msgs, 2) == 2) 585 return 0; 586 587 dev_info(&adapter->dev, "unable to read EDID block.\n"); 588 return -1; 589 } 590 EXPORT_SYMBOL(drm_do_probe_ddc_edid); 591 592 /** 593 * Get EDID information. 594 * 595 * \param adapter : i2c device adaptor. 596 * \param buf : EDID data buffer to be filled 597 * \param len : EDID data buffer length 598 * \return 0 on success or -1 on failure. 599 * 600 * Initialize DDC, then fetch EDID information 601 * by calling drm_do_probe_ddc_edid function. 602 */ 603 static int drm_ddc_read(struct i2c_adapter *adapter, 604 unsigned char *buf, int len) 605 { 606 struct i2c_algo_bit_data *algo_data = adapter->algo_data; 607 int i, j; 608 int ret = -1; 609 610 algo_data->setscl(algo_data->data, 1); 611 612 for (i = 0; i < 1; i++) { 613 /* For some old monitors we need the 614 * following process to initialize/stop DDC 615 */ 616 algo_data->setsda(algo_data->data, 1); 617 msleep(13); 618 619 algo_data->setscl(algo_data->data, 1); 620 for (j = 0; j < 5; j++) { 621 msleep(10); 622 if (algo_data->getscl(algo_data->data)) 623 break; 624 } 625 if (j == 5) 626 continue; 627 628 algo_data->setsda(algo_data->data, 0); 629 msleep(15); 630 algo_data->setscl(algo_data->data, 0); 631 msleep(15); 632 algo_data->setsda(algo_data->data, 1); 633 msleep(15); 634 635 /* Do the real work */ 636 ret = drm_do_probe_ddc_edid(adapter, buf, len); 637 algo_data->setsda(algo_data->data, 0); 638 algo_data->setscl(algo_data->data, 0); 639 msleep(15); 640 641 algo_data->setscl(algo_data->data, 1); 642 for (j = 0; j < 10; j++) { 643 msleep(10); 644 if (algo_data->getscl(algo_data->data)) 645 break; 646 } 647 648 algo_data->setsda(algo_data->data, 1); 649 msleep(15); 650 algo_data->setscl(algo_data->data, 0); 651 algo_data->setsda(algo_data->data, 0); 652 if (ret == 0) 653 break; 654 } 655 /* Release the DDC lines when done or the Apple Cinema HD display 656 * will switch off 657 */ 658 algo_data->setsda(algo_data->data, 1); 659 algo_data->setscl(algo_data->data, 1); 660 661 return ret; 662 } 663 664 static int drm_ddc_read_edid(struct drm_connector *connector, 665 struct i2c_adapter *adapter, 666 char *buf, int len) 667 { 668 int ret; 669 670 ret = drm_ddc_read(adapter, buf, len); 671 if (ret != 0) { 672 dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n", 673 drm_get_connector_name(connector)); 674 goto end; 675 } 676 if (!edid_is_valid((struct edid *)buf)) { 677 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 678 drm_get_connector_name(connector)); 679 ret = -1; 680 } 681 end: 682 return ret; 683 } 684 685 #define MAX_EDID_EXT_NUM 4 686 /** 687 * drm_get_edid - get EDID data, if available 688 * @connector: connector we're probing 689 * @adapter: i2c adapter to use for DDC 690 * 691 * Poke the given connector's i2c channel to grab EDID data if possible. 692 * 693 * Return edid data or NULL if we couldn't find any. 694 */ 695 struct edid *drm_get_edid(struct drm_connector *connector, 696 struct i2c_adapter *adapter) 697 { 698 int ret; 699 struct edid *edid; 700 701 edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1), 702 GFP_KERNEL); 703 if (edid == NULL) { 704 dev_warn(&connector->dev->pdev->dev, 705 "Failed to allocate EDID\n"); 706 goto end; 707 } 708 709 /* Read first EDID block */ 710 ret = drm_ddc_read_edid(connector, adapter, 711 (unsigned char *)edid, EDID_LENGTH); 712 if (ret != 0) 713 goto clean_up; 714 715 /* There are EDID extensions to be read */ 716 if (edid->extensions != 0) { 717 int edid_ext_num = edid->extensions; 718 719 if (edid_ext_num > MAX_EDID_EXT_NUM) { 720 dev_warn(&connector->dev->pdev->dev, 721 "The number of extension(%d) is " 722 "over max (%d), actually read number (%d)\n", 723 edid_ext_num, MAX_EDID_EXT_NUM, 724 MAX_EDID_EXT_NUM); 725 /* Reset EDID extension number to be read */ 726 edid_ext_num = MAX_EDID_EXT_NUM; 727 } 728 /* Read EDID including extensions too */ 729 ret = drm_ddc_read_edid(connector, adapter, (char *)edid, 730 EDID_LENGTH * (edid_ext_num + 1)); 731 if (ret != 0) 732 goto clean_up; 733 734 } 735 736 connector->display_info.raw_edid = (char *)edid; 737 goto end; 738 739 clean_up: 740 kfree(edid); 741 edid = NULL; 742 end: 743 return edid; 744 745 } 746 EXPORT_SYMBOL(drm_get_edid); 747 748 #define HDMI_IDENTIFIER 0x000C03 749 #define VENDOR_BLOCK 0x03 750 /** 751 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 752 * @edid: monitor EDID information 753 * 754 * Parse the CEA extension according to CEA-861-B. 755 * Return true if HDMI, false if not or unknown. 756 */ 757 bool drm_detect_hdmi_monitor(struct edid *edid) 758 { 759 char *edid_ext = NULL; 760 int i, hdmi_id, edid_ext_num; 761 int start_offset, end_offset; 762 bool is_hdmi = false; 763 764 /* No EDID or EDID extensions */ 765 if (edid == NULL || edid->extensions == 0) 766 goto end; 767 768 /* Chose real EDID extension number */ 769 edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ? 770 MAX_EDID_EXT_NUM : edid->extensions; 771 772 /* Find CEA extension */ 773 for (i = 0; i < edid_ext_num; i++) { 774 edid_ext = (char *)edid + EDID_LENGTH * (i + 1); 775 /* This block is CEA extension */ 776 if (edid_ext[0] == 0x02) 777 break; 778 } 779 780 if (i == edid_ext_num) 781 goto end; 782 783 /* Data block offset in CEA extension block */ 784 start_offset = 4; 785 end_offset = edid_ext[2]; 786 787 /* 788 * Because HDMI identifier is in Vendor Specific Block, 789 * search it from all data blocks of CEA extension. 790 */ 791 for (i = start_offset; i < end_offset; 792 /* Increased by data block len */ 793 i += ((edid_ext[i] & 0x1f) + 1)) { 794 /* Find vendor specific block */ 795 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 796 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 797 edid_ext[i + 3] << 16; 798 /* Find HDMI identifier */ 799 if (hdmi_id == HDMI_IDENTIFIER) 800 is_hdmi = true; 801 break; 802 } 803 } 804 805 end: 806 return is_hdmi; 807 } 808 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 809 810 /** 811 * drm_add_edid_modes - add modes from EDID data, if available 812 * @connector: connector we're probing 813 * @edid: edid data 814 * 815 * Add the specified modes to the connector's mode list. 816 * 817 * Return number of modes added or 0 if we couldn't find any. 818 */ 819 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 820 { 821 int num_modes = 0; 822 u32 quirks; 823 824 if (edid == NULL) { 825 return 0; 826 } 827 if (!edid_is_valid(edid)) { 828 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 829 drm_get_connector_name(connector)); 830 return 0; 831 } 832 833 quirks = edid_get_quirks(edid); 834 835 num_modes += add_established_modes(connector, edid); 836 num_modes += add_standard_modes(connector, edid); 837 num_modes += add_detailed_info(connector, edid, quirks); 838 839 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 840 edid_fixup_preferred(connector, quirks); 841 842 connector->display_info.serration_vsync = edid->serration_vsync; 843 connector->display_info.sync_on_green = edid->sync_on_green; 844 connector->display_info.composite_sync = edid->composite_sync; 845 connector->display_info.separate_syncs = edid->separate_syncs; 846 connector->display_info.blank_to_black = edid->blank_to_black; 847 connector->display_info.video_level = edid->video_level; 848 connector->display_info.digital = edid->digital; 849 connector->display_info.width_mm = edid->width_cm * 10; 850 connector->display_info.height_mm = edid->height_cm * 10; 851 connector->display_info.gamma = edid->gamma; 852 connector->display_info.gtf_supported = edid->default_gtf; 853 connector->display_info.standard_color = edid->standard_color; 854 connector->display_info.display_type = edid->display_type; 855 connector->display_info.active_off_supported = edid->pm_active_off; 856 connector->display_info.suspend_supported = edid->pm_suspend; 857 connector->display_info.standby_supported = edid->pm_standby; 858 connector->display_info.gamma = edid->gamma; 859 860 return num_modes; 861 } 862 EXPORT_SYMBOL(drm_add_edid_modes); 863