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 if (pt->stereo) { 293 printk(KERN_WARNING "stereo mode not supported\n"); 294 return NULL; 295 } 296 if (!pt->separate_sync) { 297 printk(KERN_WARNING "integrated sync not supported\n"); 298 return NULL; 299 } 300 301 mode = drm_mode_create(dev); 302 if (!mode) 303 return NULL; 304 305 mode->type = DRM_MODE_TYPE_DRIVER; 306 307 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 308 timing->pixel_clock = 1088; 309 310 mode->clock = timing->pixel_clock * 10; 311 312 mode->hdisplay = (pt->hactive_hi << 8) | pt->hactive_lo; 313 mode->hsync_start = mode->hdisplay + ((pt->hsync_offset_hi << 8) | 314 pt->hsync_offset_lo); 315 mode->hsync_end = mode->hsync_start + 316 ((pt->hsync_pulse_width_hi << 8) | 317 pt->hsync_pulse_width_lo); 318 mode->htotal = mode->hdisplay + ((pt->hblank_hi << 8) | pt->hblank_lo); 319 320 mode->vdisplay = (pt->vactive_hi << 8) | pt->vactive_lo; 321 mode->vsync_start = mode->vdisplay + ((pt->vsync_offset_hi << 4) | 322 pt->vsync_offset_lo); 323 mode->vsync_end = mode->vsync_start + 324 ((pt->vsync_pulse_width_hi << 4) | 325 pt->vsync_pulse_width_lo); 326 mode->vtotal = mode->vdisplay + ((pt->vblank_hi << 8) | pt->vblank_lo); 327 328 drm_mode_set_name(mode); 329 330 if (pt->interlaced) 331 mode->flags |= DRM_MODE_FLAG_INTERLACE; 332 333 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 334 pt->hsync_positive = 1; 335 pt->vsync_positive = 1; 336 } 337 338 mode->flags |= pt->hsync_positive ? DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 339 mode->flags |= pt->vsync_positive ? DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 340 341 mode->width_mm = pt->width_mm_lo | (pt->width_mm_hi << 8); 342 mode->height_mm = pt->height_mm_lo | (pt->height_mm_hi << 8); 343 344 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 345 mode->width_mm *= 10; 346 mode->height_mm *= 10; 347 } 348 349 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 350 mode->width_mm = edid->width_cm * 10; 351 mode->height_mm = edid->height_cm * 10; 352 } 353 354 return mode; 355 } 356 357 /* 358 * Detailed mode info for the EDID "established modes" data to use. 359 */ 360 static struct drm_display_mode edid_est_modes[] = { 361 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840, 362 968, 1056, 0, 600, 601, 605, 628, 0, 363 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */ 364 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824, 365 896, 1024, 0, 600, 601, 603, 625, 0, 366 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */ 367 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656, 368 720, 840, 0, 480, 481, 484, 500, 0, 369 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */ 370 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664, 371 704, 832, 0, 480, 489, 491, 520, 0, 372 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */ 373 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704, 374 768, 864, 0, 480, 483, 486, 525, 0, 375 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */ 376 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656, 377 752, 800, 0, 480, 490, 492, 525, 0, 378 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */ 379 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738, 380 846, 900, 0, 400, 421, 423, 449, 0, 381 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */ 382 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738, 383 846, 900, 0, 400, 412, 414, 449, 0, 384 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */ 385 { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296, 386 1440, 1688, 0, 1024, 1025, 1028, 1066, 0, 387 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */ 388 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040, 389 1136, 1312, 0, 768, 769, 772, 800, 0, 390 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */ 391 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048, 392 1184, 1328, 0, 768, 771, 777, 806, 0, 393 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */ 394 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048, 395 1184, 1344, 0, 768, 771, 777, 806, 0, 396 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */ 397 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032, 398 1208, 1264, 0, 768, 768, 776, 817, 0, 399 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */ 400 { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864, 401 928, 1152, 0, 624, 625, 628, 667, 0, 402 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */ 403 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816, 404 896, 1056, 0, 600, 601, 604, 625, 0, 405 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */ 406 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856, 407 976, 1040, 0, 600, 637, 643, 666, 0, 408 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */ 409 { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216, 410 1344, 1600, 0, 864, 865, 868, 900, 0, 411 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */ 412 }; 413 414 #define EDID_EST_TIMINGS 16 415 #define EDID_STD_TIMINGS 8 416 #define EDID_DETAILED_TIMINGS 4 417 418 /** 419 * add_established_modes - get est. modes from EDID and add them 420 * @edid: EDID block to scan 421 * 422 * Each EDID block contains a bitmap of the supported "established modes" list 423 * (defined above). Tease them out and add them to the global modes list. 424 */ 425 static int add_established_modes(struct drm_connector *connector, struct edid *edid) 426 { 427 struct drm_device *dev = connector->dev; 428 unsigned long est_bits = edid->established_timings.t1 | 429 (edid->established_timings.t2 << 8) | 430 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 431 int i, modes = 0; 432 433 for (i = 0; i <= EDID_EST_TIMINGS; i++) 434 if (est_bits & (1<<i)) { 435 struct drm_display_mode *newmode; 436 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 437 if (newmode) { 438 drm_mode_probed_add(connector, newmode); 439 modes++; 440 } 441 } 442 443 return modes; 444 } 445 446 /** 447 * add_standard_modes - get std. modes from EDID and add them 448 * @edid: EDID block to scan 449 * 450 * Standard modes can be calculated using the CVT standard. Grab them from 451 * @edid, calculate them, and add them to the list. 452 */ 453 static int add_standard_modes(struct drm_connector *connector, struct edid *edid) 454 { 455 struct drm_device *dev = connector->dev; 456 int i, modes = 0; 457 458 for (i = 0; i < EDID_STD_TIMINGS; i++) { 459 struct std_timing *t = &edid->standard_timings[i]; 460 struct drm_display_mode *newmode; 461 462 /* If std timings bytes are 1, 1 it's empty */ 463 if (t->hsize == 1 && (t->aspect_ratio | t->vfreq) == 1) 464 continue; 465 466 newmode = drm_mode_std(dev, &edid->standard_timings[i]); 467 if (newmode) { 468 drm_mode_probed_add(connector, newmode); 469 modes++; 470 } 471 } 472 473 return modes; 474 } 475 476 /** 477 * add_detailed_modes - get detailed mode info from EDID data 478 * @connector: attached connector 479 * @edid: EDID block to scan 480 * @quirks: quirks to apply 481 * 482 * Some of the detailed timing sections may contain mode information. Grab 483 * it and add it to the list. 484 */ 485 static int add_detailed_info(struct drm_connector *connector, 486 struct edid *edid, u32 quirks) 487 { 488 struct drm_device *dev = connector->dev; 489 int i, j, modes = 0; 490 491 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) { 492 struct detailed_timing *timing = &edid->detailed_timings[i]; 493 struct detailed_non_pixel *data = &timing->data.other_data; 494 struct drm_display_mode *newmode; 495 496 /* EDID up to and including 1.2 may put monitor info here */ 497 if (edid->version == 1 && edid->revision < 3) 498 continue; 499 500 /* Detailed mode timing */ 501 if (timing->pixel_clock) { 502 newmode = drm_mode_detailed(dev, edid, timing, quirks); 503 if (!newmode) 504 continue; 505 506 /* First detailed mode is preferred */ 507 if (i == 0 && edid->preferred_timing) 508 newmode->type |= DRM_MODE_TYPE_PREFERRED; 509 drm_mode_probed_add(connector, newmode); 510 511 modes++; 512 continue; 513 } 514 515 /* Other timing or info */ 516 switch (data->type) { 517 case EDID_DETAIL_MONITOR_SERIAL: 518 break; 519 case EDID_DETAIL_MONITOR_STRING: 520 break; 521 case EDID_DETAIL_MONITOR_RANGE: 522 /* Get monitor range data */ 523 break; 524 case EDID_DETAIL_MONITOR_NAME: 525 break; 526 case EDID_DETAIL_MONITOR_CPDATA: 527 break; 528 case EDID_DETAIL_STD_MODES: 529 /* Five modes per detailed section */ 530 for (j = 0; j < 5; i++) { 531 struct std_timing *std; 532 struct drm_display_mode *newmode; 533 534 std = &data->data.timings[j]; 535 newmode = drm_mode_std(dev, std); 536 if (newmode) { 537 drm_mode_probed_add(connector, newmode); 538 modes++; 539 } 540 } 541 break; 542 default: 543 break; 544 } 545 } 546 547 return modes; 548 } 549 550 #define DDC_ADDR 0x50 551 /** 552 * Get EDID information via I2C. 553 * 554 * \param adapter : i2c device adaptor 555 * \param buf : EDID data buffer to be filled 556 * \param len : EDID data buffer length 557 * \return 0 on success or -1 on failure. 558 * 559 * Try to fetch EDID information by calling i2c driver function. 560 */ 561 int drm_do_probe_ddc_edid(struct i2c_adapter *adapter, 562 unsigned char *buf, int len) 563 { 564 unsigned char start = 0x0; 565 struct i2c_msg msgs[] = { 566 { 567 .addr = DDC_ADDR, 568 .flags = 0, 569 .len = 1, 570 .buf = &start, 571 }, { 572 .addr = DDC_ADDR, 573 .flags = I2C_M_RD, 574 .len = len, 575 .buf = buf, 576 } 577 }; 578 579 if (i2c_transfer(adapter, msgs, 2) == 2) 580 return 0; 581 582 dev_info(&adapter->dev, "unable to read EDID block.\n"); 583 return -1; 584 } 585 EXPORT_SYMBOL(drm_do_probe_ddc_edid); 586 587 /** 588 * Get EDID information. 589 * 590 * \param adapter : i2c device adaptor. 591 * \param buf : EDID data buffer to be filled 592 * \param len : EDID data buffer length 593 * \return 0 on success or -1 on failure. 594 * 595 * Initialize DDC, then fetch EDID information 596 * by calling drm_do_probe_ddc_edid function. 597 */ 598 static int drm_ddc_read(struct i2c_adapter *adapter, 599 unsigned char *buf, int len) 600 { 601 struct i2c_algo_bit_data *algo_data = adapter->algo_data; 602 int i, j; 603 int ret = -1; 604 605 algo_data->setscl(algo_data->data, 1); 606 607 for (i = 0; i < 1; i++) { 608 /* For some old monitors we need the 609 * following process to initialize/stop DDC 610 */ 611 algo_data->setsda(algo_data->data, 1); 612 msleep(13); 613 614 algo_data->setscl(algo_data->data, 1); 615 for (j = 0; j < 5; j++) { 616 msleep(10); 617 if (algo_data->getscl(algo_data->data)) 618 break; 619 } 620 if (j == 5) 621 continue; 622 623 algo_data->setsda(algo_data->data, 0); 624 msleep(15); 625 algo_data->setscl(algo_data->data, 0); 626 msleep(15); 627 algo_data->setsda(algo_data->data, 1); 628 msleep(15); 629 630 /* Do the real work */ 631 ret = drm_do_probe_ddc_edid(adapter, buf, len); 632 algo_data->setsda(algo_data->data, 0); 633 algo_data->setscl(algo_data->data, 0); 634 msleep(15); 635 636 algo_data->setscl(algo_data->data, 1); 637 for (j = 0; j < 10; j++) { 638 msleep(10); 639 if (algo_data->getscl(algo_data->data)) 640 break; 641 } 642 643 algo_data->setsda(algo_data->data, 1); 644 msleep(15); 645 algo_data->setscl(algo_data->data, 0); 646 algo_data->setsda(algo_data->data, 0); 647 if (ret == 0) 648 break; 649 } 650 /* Release the DDC lines when done or the Apple Cinema HD display 651 * will switch off 652 */ 653 algo_data->setsda(algo_data->data, 1); 654 algo_data->setscl(algo_data->data, 1); 655 656 return ret; 657 } 658 659 static int drm_ddc_read_edid(struct drm_connector *connector, 660 struct i2c_adapter *adapter, 661 char *buf, int len) 662 { 663 int ret; 664 665 ret = drm_ddc_read(adapter, buf, len); 666 if (ret != 0) { 667 dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n", 668 drm_get_connector_name(connector)); 669 goto end; 670 } 671 if (!edid_is_valid((struct edid *)buf)) { 672 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 673 drm_get_connector_name(connector)); 674 ret = -1; 675 } 676 end: 677 return ret; 678 } 679 680 #define MAX_EDID_EXT_NUM 4 681 /** 682 * drm_get_edid - get EDID data, if available 683 * @connector: connector we're probing 684 * @adapter: i2c adapter to use for DDC 685 * 686 * Poke the given connector's i2c channel to grab EDID data if possible. 687 * 688 * Return edid data or NULL if we couldn't find any. 689 */ 690 struct edid *drm_get_edid(struct drm_connector *connector, 691 struct i2c_adapter *adapter) 692 { 693 int ret; 694 struct edid *edid; 695 696 edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1), 697 GFP_KERNEL); 698 if (edid == NULL) { 699 dev_warn(&connector->dev->pdev->dev, 700 "Failed to allocate EDID\n"); 701 goto end; 702 } 703 704 /* Read first EDID block */ 705 ret = drm_ddc_read_edid(connector, adapter, 706 (unsigned char *)edid, EDID_LENGTH); 707 if (ret != 0) 708 goto clean_up; 709 710 /* There are EDID extensions to be read */ 711 if (edid->extensions != 0) { 712 int edid_ext_num = edid->extensions; 713 714 if (edid_ext_num > MAX_EDID_EXT_NUM) { 715 dev_warn(&connector->dev->pdev->dev, 716 "The number of extension(%d) is " 717 "over max (%d), actually read number (%d)\n", 718 edid_ext_num, MAX_EDID_EXT_NUM, 719 MAX_EDID_EXT_NUM); 720 /* Reset EDID extension number to be read */ 721 edid_ext_num = MAX_EDID_EXT_NUM; 722 } 723 /* Read EDID including extensions too */ 724 ret = drm_ddc_read_edid(connector, adapter, (char *)edid, 725 EDID_LENGTH * (edid_ext_num + 1)); 726 if (ret != 0) 727 goto clean_up; 728 729 } 730 731 connector->display_info.raw_edid = (char *)edid; 732 goto end; 733 734 clean_up: 735 kfree(edid); 736 edid = NULL; 737 end: 738 return edid; 739 740 } 741 EXPORT_SYMBOL(drm_get_edid); 742 743 #define HDMI_IDENTIFIER 0x000C03 744 #define VENDOR_BLOCK 0x03 745 /** 746 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 747 * @edid: monitor EDID information 748 * 749 * Parse the CEA extension according to CEA-861-B. 750 * Return true if HDMI, false if not or unknown. 751 */ 752 bool drm_detect_hdmi_monitor(struct edid *edid) 753 { 754 char *edid_ext = NULL; 755 int i, hdmi_id, edid_ext_num; 756 int start_offset, end_offset; 757 bool is_hdmi = false; 758 759 /* No EDID or EDID extensions */ 760 if (edid == NULL || edid->extensions == 0) 761 goto end; 762 763 /* Chose real EDID extension number */ 764 edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ? 765 MAX_EDID_EXT_NUM : edid->extensions; 766 767 /* Find CEA extension */ 768 for (i = 0; i < edid_ext_num; i++) { 769 edid_ext = (char *)edid + EDID_LENGTH * (i + 1); 770 /* This block is CEA extension */ 771 if (edid_ext[0] == 0x02) 772 break; 773 } 774 775 if (i == edid_ext_num) 776 goto end; 777 778 /* Data block offset in CEA extension block */ 779 start_offset = 4; 780 end_offset = edid_ext[2]; 781 782 /* 783 * Because HDMI identifier is in Vendor Specific Block, 784 * search it from all data blocks of CEA extension. 785 */ 786 for (i = start_offset; i < end_offset; 787 /* Increased by data block len */ 788 i += ((edid_ext[i] & 0x1f) + 1)) { 789 /* Find vendor specific block */ 790 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 791 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 792 edid_ext[i + 3] << 16; 793 /* Find HDMI identifier */ 794 if (hdmi_id == HDMI_IDENTIFIER) 795 is_hdmi = true; 796 break; 797 } 798 } 799 800 end: 801 return is_hdmi; 802 } 803 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 804 805 /** 806 * drm_add_edid_modes - add modes from EDID data, if available 807 * @connector: connector we're probing 808 * @edid: edid data 809 * 810 * Add the specified modes to the connector's mode list. 811 * 812 * Return number of modes added or 0 if we couldn't find any. 813 */ 814 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 815 { 816 int num_modes = 0; 817 u32 quirks; 818 819 if (edid == NULL) { 820 return 0; 821 } 822 if (!edid_is_valid(edid)) { 823 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 824 drm_get_connector_name(connector)); 825 return 0; 826 } 827 828 quirks = edid_get_quirks(edid); 829 830 num_modes += add_established_modes(connector, edid); 831 num_modes += add_standard_modes(connector, edid); 832 num_modes += add_detailed_info(connector, edid, quirks); 833 834 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 835 edid_fixup_preferred(connector, quirks); 836 837 connector->display_info.serration_vsync = edid->serration_vsync; 838 connector->display_info.sync_on_green = edid->sync_on_green; 839 connector->display_info.composite_sync = edid->composite_sync; 840 connector->display_info.separate_syncs = edid->separate_syncs; 841 connector->display_info.blank_to_black = edid->blank_to_black; 842 connector->display_info.video_level = edid->video_level; 843 connector->display_info.digital = edid->digital; 844 connector->display_info.width_mm = edid->width_cm * 10; 845 connector->display_info.height_mm = edid->height_cm * 10; 846 connector->display_info.gamma = edid->gamma; 847 connector->display_info.gtf_supported = edid->default_gtf; 848 connector->display_info.standard_color = edid->standard_color; 849 connector->display_info.display_type = edid->display_type; 850 connector->display_info.active_off_supported = edid->pm_active_off; 851 connector->display_info.suspend_supported = edid->pm_suspend; 852 connector->display_info.standby_supported = edid->pm_standby; 853 connector->display_info.gamma = edid->gamma; 854 855 return num_modes; 856 } 857 EXPORT_SYMBOL(drm_add_edid_modes); 858