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 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 256 >> EDID_TIMING_ASPECT_SHIFT; 257 258 mode = drm_mode_create(dev); 259 if (!mode) 260 return NULL; 261 262 if (aspect_ratio == 0) 263 vsize = (hsize * 10) / 16; 264 else if (aspect_ratio == 1) 265 vsize = (hsize * 3) / 4; 266 else if (aspect_ratio == 2) 267 vsize = (hsize * 4) / 5; 268 else 269 vsize = (hsize * 9) / 16; 270 271 drm_mode_set_name(mode); 272 273 return mode; 274 } 275 276 /** 277 * drm_mode_detailed - create a new mode from an EDID detailed timing section 278 * @dev: DRM device (needed to create new mode) 279 * @edid: EDID block 280 * @timing: EDID detailed timing info 281 * @quirks: quirks to apply 282 * 283 * An EDID detailed timing block contains enough info for us to create and 284 * return a new struct drm_display_mode. 285 */ 286 static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 287 struct edid *edid, 288 struct detailed_timing *timing, 289 u32 quirks) 290 { 291 struct drm_display_mode *mode; 292 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 293 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 294 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 295 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 296 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 297 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 298 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 299 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 300 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 301 302 /* ignore tiny modes */ 303 if (hactive < 64 || vactive < 64) 304 return NULL; 305 306 if (pt->misc & DRM_EDID_PT_STEREO) { 307 printk(KERN_WARNING "stereo mode not supported\n"); 308 return NULL; 309 } 310 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 311 printk(KERN_WARNING "integrated sync not supported\n"); 312 return NULL; 313 } 314 315 mode = drm_mode_create(dev); 316 if (!mode) 317 return NULL; 318 319 mode->type = DRM_MODE_TYPE_DRIVER; 320 321 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 322 timing->pixel_clock = cpu_to_le16(1088); 323 324 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 325 326 mode->hdisplay = hactive; 327 mode->hsync_start = mode->hdisplay + hsync_offset; 328 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 329 mode->htotal = mode->hdisplay + hblank; 330 331 mode->vdisplay = vactive; 332 mode->vsync_start = mode->vdisplay + vsync_offset; 333 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 334 mode->vtotal = mode->vdisplay + vblank; 335 336 drm_mode_set_name(mode); 337 338 if (pt->misc & DRM_EDID_PT_INTERLACED) 339 mode->flags |= DRM_MODE_FLAG_INTERLACE; 340 341 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 342 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 343 } 344 345 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 346 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 347 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 348 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 349 350 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 351 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 352 353 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 354 mode->width_mm *= 10; 355 mode->height_mm *= 10; 356 } 357 358 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 359 mode->width_mm = edid->width_cm * 10; 360 mode->height_mm = edid->height_cm * 10; 361 } 362 363 return mode; 364 } 365 366 /* 367 * Detailed mode info for the EDID "established modes" data to use. 368 */ 369 static struct drm_display_mode edid_est_modes[] = { 370 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840, 371 968, 1056, 0, 600, 601, 605, 628, 0, 372 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */ 373 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824, 374 896, 1024, 0, 600, 601, 603, 625, 0, 375 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */ 376 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656, 377 720, 840, 0, 480, 481, 484, 500, 0, 378 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */ 379 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664, 380 704, 832, 0, 480, 489, 491, 520, 0, 381 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */ 382 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704, 383 768, 864, 0, 480, 483, 486, 525, 0, 384 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */ 385 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656, 386 752, 800, 0, 480, 490, 492, 525, 0, 387 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */ 388 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738, 389 846, 900, 0, 400, 421, 423, 449, 0, 390 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */ 391 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738, 392 846, 900, 0, 400, 412, 414, 449, 0, 393 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */ 394 { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296, 395 1440, 1688, 0, 1024, 1025, 1028, 1066, 0, 396 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */ 397 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040, 398 1136, 1312, 0, 768, 769, 772, 800, 0, 399 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */ 400 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048, 401 1184, 1328, 0, 768, 771, 777, 806, 0, 402 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */ 403 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048, 404 1184, 1344, 0, 768, 771, 777, 806, 0, 405 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */ 406 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032, 407 1208, 1264, 0, 768, 768, 776, 817, 0, 408 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */ 409 { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864, 410 928, 1152, 0, 624, 625, 628, 667, 0, 411 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */ 412 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816, 413 896, 1056, 0, 600, 601, 604, 625, 0, 414 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */ 415 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856, 416 976, 1040, 0, 600, 637, 643, 666, 0, 417 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */ 418 { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216, 419 1344, 1600, 0, 864, 865, 868, 900, 0, 420 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */ 421 }; 422 423 #define EDID_EST_TIMINGS 16 424 #define EDID_STD_TIMINGS 8 425 #define EDID_DETAILED_TIMINGS 4 426 427 /** 428 * add_established_modes - get est. modes from EDID and add them 429 * @edid: EDID block to scan 430 * 431 * Each EDID block contains a bitmap of the supported "established modes" list 432 * (defined above). Tease them out and add them to the global modes list. 433 */ 434 static int add_established_modes(struct drm_connector *connector, struct edid *edid) 435 { 436 struct drm_device *dev = connector->dev; 437 unsigned long est_bits = edid->established_timings.t1 | 438 (edid->established_timings.t2 << 8) | 439 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 440 int i, modes = 0; 441 442 for (i = 0; i <= EDID_EST_TIMINGS; i++) 443 if (est_bits & (1<<i)) { 444 struct drm_display_mode *newmode; 445 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 446 if (newmode) { 447 drm_mode_probed_add(connector, newmode); 448 modes++; 449 } 450 } 451 452 return modes; 453 } 454 455 /** 456 * add_standard_modes - get std. modes from EDID and add them 457 * @edid: EDID block to scan 458 * 459 * Standard modes can be calculated using the CVT standard. Grab them from 460 * @edid, calculate them, and add them to the list. 461 */ 462 static int add_standard_modes(struct drm_connector *connector, struct edid *edid) 463 { 464 struct drm_device *dev = connector->dev; 465 int i, modes = 0; 466 467 for (i = 0; i < EDID_STD_TIMINGS; i++) { 468 struct std_timing *t = &edid->standard_timings[i]; 469 struct drm_display_mode *newmode; 470 471 /* If std timings bytes are 1, 1 it's empty */ 472 if (t->hsize == 1 && t->vfreq_aspect == 1) 473 continue; 474 475 newmode = drm_mode_std(dev, &edid->standard_timings[i]); 476 if (newmode) { 477 drm_mode_probed_add(connector, newmode); 478 modes++; 479 } 480 } 481 482 return modes; 483 } 484 485 /** 486 * add_detailed_modes - get detailed mode info from EDID data 487 * @connector: attached connector 488 * @edid: EDID block to scan 489 * @quirks: quirks to apply 490 * 491 * Some of the detailed timing sections may contain mode information. Grab 492 * it and add it to the list. 493 */ 494 static int add_detailed_info(struct drm_connector *connector, 495 struct edid *edid, u32 quirks) 496 { 497 struct drm_device *dev = connector->dev; 498 int i, j, modes = 0; 499 500 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) { 501 struct detailed_timing *timing = &edid->detailed_timings[i]; 502 struct detailed_non_pixel *data = &timing->data.other_data; 503 struct drm_display_mode *newmode; 504 505 /* EDID up to and including 1.2 may put monitor info here */ 506 if (edid->version == 1 && edid->revision < 3) 507 continue; 508 509 /* Detailed mode timing */ 510 if (timing->pixel_clock) { 511 newmode = drm_mode_detailed(dev, edid, timing, quirks); 512 if (!newmode) 513 continue; 514 515 /* First detailed mode is preferred */ 516 if (i == 0 && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING)) 517 newmode->type |= DRM_MODE_TYPE_PREFERRED; 518 drm_mode_probed_add(connector, newmode); 519 520 modes++; 521 continue; 522 } 523 524 /* Other timing or info */ 525 switch (data->type) { 526 case EDID_DETAIL_MONITOR_SERIAL: 527 break; 528 case EDID_DETAIL_MONITOR_STRING: 529 break; 530 case EDID_DETAIL_MONITOR_RANGE: 531 /* Get monitor range data */ 532 break; 533 case EDID_DETAIL_MONITOR_NAME: 534 break; 535 case EDID_DETAIL_MONITOR_CPDATA: 536 break; 537 case EDID_DETAIL_STD_MODES: 538 /* Five modes per detailed section */ 539 for (j = 0; j < 5; i++) { 540 struct std_timing *std; 541 struct drm_display_mode *newmode; 542 543 std = &data->data.timings[j]; 544 newmode = drm_mode_std(dev, std); 545 if (newmode) { 546 drm_mode_probed_add(connector, newmode); 547 modes++; 548 } 549 } 550 break; 551 default: 552 break; 553 } 554 } 555 556 return modes; 557 } 558 559 #define DDC_ADDR 0x50 560 /** 561 * Get EDID information via I2C. 562 * 563 * \param adapter : i2c device adaptor 564 * \param buf : EDID data buffer to be filled 565 * \param len : EDID data buffer length 566 * \return 0 on success or -1 on failure. 567 * 568 * Try to fetch EDID information by calling i2c driver function. 569 */ 570 int drm_do_probe_ddc_edid(struct i2c_adapter *adapter, 571 unsigned char *buf, int len) 572 { 573 unsigned char start = 0x0; 574 struct i2c_msg msgs[] = { 575 { 576 .addr = DDC_ADDR, 577 .flags = 0, 578 .len = 1, 579 .buf = &start, 580 }, { 581 .addr = DDC_ADDR, 582 .flags = I2C_M_RD, 583 .len = len, 584 .buf = buf, 585 } 586 }; 587 588 if (i2c_transfer(adapter, msgs, 2) == 2) 589 return 0; 590 591 dev_info(&adapter->dev, "unable to read EDID block.\n"); 592 return -1; 593 } 594 EXPORT_SYMBOL(drm_do_probe_ddc_edid); 595 596 static int drm_ddc_read_edid(struct drm_connector *connector, 597 struct i2c_adapter *adapter, 598 char *buf, int len) 599 { 600 int ret; 601 602 ret = drm_do_probe_ddc_edid(adapter, buf, len); 603 if (ret != 0) { 604 dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n", 605 drm_get_connector_name(connector)); 606 goto end; 607 } 608 if (!edid_is_valid((struct edid *)buf)) { 609 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 610 drm_get_connector_name(connector)); 611 ret = -1; 612 } 613 end: 614 return ret; 615 } 616 617 #define MAX_EDID_EXT_NUM 4 618 /** 619 * drm_get_edid - get EDID data, if available 620 * @connector: connector we're probing 621 * @adapter: i2c adapter to use for DDC 622 * 623 * Poke the given connector's i2c channel to grab EDID data if possible. 624 * 625 * Return edid data or NULL if we couldn't find any. 626 */ 627 struct edid *drm_get_edid(struct drm_connector *connector, 628 struct i2c_adapter *adapter) 629 { 630 int ret; 631 struct edid *edid; 632 633 edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1), 634 GFP_KERNEL); 635 if (edid == NULL) { 636 dev_warn(&connector->dev->pdev->dev, 637 "Failed to allocate EDID\n"); 638 goto end; 639 } 640 641 /* Read first EDID block */ 642 ret = drm_ddc_read_edid(connector, adapter, 643 (unsigned char *)edid, EDID_LENGTH); 644 if (ret != 0) 645 goto clean_up; 646 647 /* There are EDID extensions to be read */ 648 if (edid->extensions != 0) { 649 int edid_ext_num = edid->extensions; 650 651 if (edid_ext_num > MAX_EDID_EXT_NUM) { 652 dev_warn(&connector->dev->pdev->dev, 653 "The number of extension(%d) is " 654 "over max (%d), actually read number (%d)\n", 655 edid_ext_num, MAX_EDID_EXT_NUM, 656 MAX_EDID_EXT_NUM); 657 /* Reset EDID extension number to be read */ 658 edid_ext_num = MAX_EDID_EXT_NUM; 659 } 660 /* Read EDID including extensions too */ 661 ret = drm_ddc_read_edid(connector, adapter, (char *)edid, 662 EDID_LENGTH * (edid_ext_num + 1)); 663 if (ret != 0) 664 goto clean_up; 665 666 } 667 668 connector->display_info.raw_edid = (char *)edid; 669 goto end; 670 671 clean_up: 672 kfree(edid); 673 edid = NULL; 674 end: 675 return edid; 676 677 } 678 EXPORT_SYMBOL(drm_get_edid); 679 680 #define HDMI_IDENTIFIER 0x000C03 681 #define VENDOR_BLOCK 0x03 682 /** 683 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 684 * @edid: monitor EDID information 685 * 686 * Parse the CEA extension according to CEA-861-B. 687 * Return true if HDMI, false if not or unknown. 688 */ 689 bool drm_detect_hdmi_monitor(struct edid *edid) 690 { 691 char *edid_ext = NULL; 692 int i, hdmi_id, edid_ext_num; 693 int start_offset, end_offset; 694 bool is_hdmi = false; 695 696 /* No EDID or EDID extensions */ 697 if (edid == NULL || edid->extensions == 0) 698 goto end; 699 700 /* Chose real EDID extension number */ 701 edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ? 702 MAX_EDID_EXT_NUM : edid->extensions; 703 704 /* Find CEA extension */ 705 for (i = 0; i < edid_ext_num; i++) { 706 edid_ext = (char *)edid + EDID_LENGTH * (i + 1); 707 /* This block is CEA extension */ 708 if (edid_ext[0] == 0x02) 709 break; 710 } 711 712 if (i == edid_ext_num) 713 goto end; 714 715 /* Data block offset in CEA extension block */ 716 start_offset = 4; 717 end_offset = edid_ext[2]; 718 719 /* 720 * Because HDMI identifier is in Vendor Specific Block, 721 * search it from all data blocks of CEA extension. 722 */ 723 for (i = start_offset; i < end_offset; 724 /* Increased by data block len */ 725 i += ((edid_ext[i] & 0x1f) + 1)) { 726 /* Find vendor specific block */ 727 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 728 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 729 edid_ext[i + 3] << 16; 730 /* Find HDMI identifier */ 731 if (hdmi_id == HDMI_IDENTIFIER) 732 is_hdmi = true; 733 break; 734 } 735 } 736 737 end: 738 return is_hdmi; 739 } 740 EXPORT_SYMBOL(drm_detect_hdmi_monitor); 741 742 /** 743 * drm_add_edid_modes - add modes from EDID data, if available 744 * @connector: connector we're probing 745 * @edid: edid data 746 * 747 * Add the specified modes to the connector's mode list. 748 * 749 * Return number of modes added or 0 if we couldn't find any. 750 */ 751 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 752 { 753 int num_modes = 0; 754 u32 quirks; 755 756 if (edid == NULL) { 757 return 0; 758 } 759 if (!edid_is_valid(edid)) { 760 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 761 drm_get_connector_name(connector)); 762 return 0; 763 } 764 765 quirks = edid_get_quirks(edid); 766 767 num_modes += add_established_modes(connector, edid); 768 num_modes += add_standard_modes(connector, edid); 769 num_modes += add_detailed_info(connector, edid, quirks); 770 771 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 772 edid_fixup_preferred(connector, quirks); 773 774 connector->display_info.serration_vsync = (edid->input & DRM_EDID_INPUT_SERRATION_VSYNC) ? 1 : 0; 775 connector->display_info.sync_on_green = (edid->input & DRM_EDID_INPUT_SYNC_ON_GREEN) ? 1 : 0; 776 connector->display_info.composite_sync = (edid->input & DRM_EDID_INPUT_COMPOSITE_SYNC) ? 1 : 0; 777 connector->display_info.separate_syncs = (edid->input & DRM_EDID_INPUT_SEPARATE_SYNCS) ? 1 : 0; 778 connector->display_info.blank_to_black = (edid->input & DRM_EDID_INPUT_BLANK_TO_BLACK) ? 1 : 0; 779 connector->display_info.video_level = (edid->input & DRM_EDID_INPUT_VIDEO_LEVEL) >> 5; 780 connector->display_info.digital = (edid->input & DRM_EDID_INPUT_DIGITAL) ? 1 : 0; 781 connector->display_info.width_mm = edid->width_cm * 10; 782 connector->display_info.height_mm = edid->height_cm * 10; 783 connector->display_info.gamma = edid->gamma; 784 connector->display_info.gtf_supported = (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF) ? 1 : 0; 785 connector->display_info.standard_color = (edid->features & DRM_EDID_FEATURE_STANDARD_COLOR) ? 1 : 0; 786 connector->display_info.display_type = (edid->features & DRM_EDID_FEATURE_DISPLAY_TYPE) >> 3; 787 connector->display_info.active_off_supported = (edid->features & DRM_EDID_FEATURE_PM_ACTIVE_OFF) ? 1 : 0; 788 connector->display_info.suspend_supported = (edid->features & DRM_EDID_FEATURE_PM_SUSPEND) ? 1 : 0; 789 connector->display_info.standby_supported = (edid->features & DRM_EDID_FEATURE_PM_STANDBY) ? 1 : 0; 790 connector->display_info.gamma = edid->gamma; 791 792 return num_modes; 793 } 794 EXPORT_SYMBOL(drm_add_edid_modes); 795