drm_edid.c revision 5c61259e6c7290082108e93815f7f72f27da14f4
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#define LEVEL_DMT 0 65#define LEVEL_GTF 1 66#define LEVEL_CVT 2 67 68static struct edid_quirk { 69 char *vendor; 70 int product_id; 71 u32 quirks; 72} edid_quirk_list[] = { 73 /* Acer AL1706 */ 74 { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 }, 75 /* Acer F51 */ 76 { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 }, 77 /* Unknown Acer */ 78 { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 79 80 /* Belinea 10 15 55 */ 81 { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 }, 82 { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 }, 83 84 /* Envision Peripherals, Inc. EN-7100e */ 85 { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH }, 86 87 /* Funai Electronics PM36B */ 88 { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 | 89 EDID_QUIRK_DETAILED_IN_CM }, 90 91 /* LG Philips LCD LP154W01-A5 */ 92 { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 93 { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, 94 95 /* Philips 107p5 CRT */ 96 { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 97 98 /* Proview AY765C */ 99 { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED }, 100 101 /* Samsung SyncMaster 205BW. Note: irony */ 102 { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP }, 103 /* Samsung SyncMaster 22[5-6]BW */ 104 { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 }, 105 { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 }, 106}; 107 108 109/* Valid EDID header has these bytes */ 110static u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 }; 111 112/** 113 * edid_is_valid - sanity check EDID data 114 * @edid: EDID data 115 * 116 * Sanity check the EDID block by looking at the header, the version number 117 * and the checksum. Return 0 if the EDID doesn't check out, or 1 if it's 118 * valid. 119 */ 120static bool edid_is_valid(struct edid *edid) 121{ 122 int i; 123 u8 csum = 0; 124 u8 *raw_edid = (u8 *)edid; 125 126 if (memcmp(edid->header, edid_header, sizeof(edid_header))) 127 goto bad; 128 if (edid->version != 1) { 129 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); 130 goto bad; 131 } 132 if (edid->revision > 4) 133 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); 134 135 for (i = 0; i < EDID_LENGTH; i++) 136 csum += raw_edid[i]; 137 if (csum) { 138 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum); 139 goto bad; 140 } 141 142 return 1; 143 144bad: 145 if (raw_edid) { 146 DRM_ERROR("Raw EDID:\n"); 147 print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH); 148 printk("\n"); 149 } 150 return 0; 151} 152 153/** 154 * edid_vendor - match a string against EDID's obfuscated vendor field 155 * @edid: EDID to match 156 * @vendor: vendor string 157 * 158 * Returns true if @vendor is in @edid, false otherwise 159 */ 160static bool edid_vendor(struct edid *edid, char *vendor) 161{ 162 char edid_vendor[3]; 163 164 edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; 165 edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | 166 ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; 167 edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; 168 169 return !strncmp(edid_vendor, vendor, 3); 170} 171 172/** 173 * edid_get_quirks - return quirk flags for a given EDID 174 * @edid: EDID to process 175 * 176 * This tells subsequent routines what fixes they need to apply. 177 */ 178static u32 edid_get_quirks(struct edid *edid) 179{ 180 struct edid_quirk *quirk; 181 int i; 182 183 for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) { 184 quirk = &edid_quirk_list[i]; 185 186 if (edid_vendor(edid, quirk->vendor) && 187 (EDID_PRODUCT_ID(edid) == quirk->product_id)) 188 return quirk->quirks; 189 } 190 191 return 0; 192} 193 194#define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay) 195#define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh)) 196 197 198/** 199 * edid_fixup_preferred - set preferred modes based on quirk list 200 * @connector: has mode list to fix up 201 * @quirks: quirks list 202 * 203 * Walk the mode list for @connector, clearing the preferred status 204 * on existing modes and setting it anew for the right mode ala @quirks. 205 */ 206static void edid_fixup_preferred(struct drm_connector *connector, 207 u32 quirks) 208{ 209 struct drm_display_mode *t, *cur_mode, *preferred_mode; 210 int target_refresh = 0; 211 212 if (list_empty(&connector->probed_modes)) 213 return; 214 215 if (quirks & EDID_QUIRK_PREFER_LARGE_60) 216 target_refresh = 60; 217 if (quirks & EDID_QUIRK_PREFER_LARGE_75) 218 target_refresh = 75; 219 220 preferred_mode = list_first_entry(&connector->probed_modes, 221 struct drm_display_mode, head); 222 223 list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) { 224 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED; 225 226 if (cur_mode == preferred_mode) 227 continue; 228 229 /* Largest mode is preferred */ 230 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode)) 231 preferred_mode = cur_mode; 232 233 /* At a given size, try to get closest to target refresh */ 234 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) && 235 MODE_REFRESH_DIFF(cur_mode, target_refresh) < 236 MODE_REFRESH_DIFF(preferred_mode, target_refresh)) { 237 preferred_mode = cur_mode; 238 } 239 } 240 241 preferred_mode->type |= DRM_MODE_TYPE_PREFERRED; 242} 243 244/** 245 * drm_mode_std - convert standard mode info (width, height, refresh) into mode 246 * @t: standard timing params 247 * @timing_level: standard timing level 248 * 249 * Take the standard timing params (in this case width, aspect, and refresh) 250 * and convert them into a real mode using CVT/GTF/DMT. 251 * 252 * Punts for now, but should eventually use the FB layer's CVT based mode 253 * generation code. 254 */ 255struct drm_display_mode *drm_mode_std(struct drm_device *dev, 256 struct std_timing *t, 257 int timing_level) 258{ 259 struct drm_display_mode *mode; 260 int hsize, vsize; 261 int vrefresh_rate; 262 unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK) 263 >> EDID_TIMING_ASPECT_SHIFT; 264 unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK) 265 >> EDID_TIMING_VFREQ_SHIFT; 266 267 /* According to the EDID spec, the hdisplay = hsize * 8 + 248 */ 268 hsize = t->hsize * 8 + 248; 269 /* vrefresh_rate = vfreq + 60 */ 270 vrefresh_rate = vfreq + 60; 271 /* the vdisplay is calculated based on the aspect ratio */ 272 if (aspect_ratio == 0) 273 vsize = (hsize * 10) / 16; 274 else if (aspect_ratio == 1) 275 vsize = (hsize * 3) / 4; 276 else if (aspect_ratio == 2) 277 vsize = (hsize * 4) / 5; 278 else 279 vsize = (hsize * 9) / 16; 280 281 mode = NULL; 282 switch (timing_level) { 283 case LEVEL_DMT: 284 mode = drm_mode_create(dev); 285 if (mode) { 286 mode->hdisplay = hsize; 287 mode->vdisplay = vsize; 288 drm_mode_set_name(mode); 289 } 290 break; 291 case LEVEL_GTF: 292 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 293 break; 294 case LEVEL_CVT: 295 mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0); 296 break; 297 } 298 return mode; 299} 300 301/** 302 * drm_mode_detailed - create a new mode from an EDID detailed timing section 303 * @dev: DRM device (needed to create new mode) 304 * @edid: EDID block 305 * @timing: EDID detailed timing info 306 * @quirks: quirks to apply 307 * 308 * An EDID detailed timing block contains enough info for us to create and 309 * return a new struct drm_display_mode. 310 */ 311static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, 312 struct edid *edid, 313 struct detailed_timing *timing, 314 u32 quirks) 315{ 316 struct drm_display_mode *mode; 317 struct detailed_pixel_timing *pt = &timing->data.pixel_data; 318 unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo; 319 unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo; 320 unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo; 321 unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo; 322 unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo; 323 unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo; 324 unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4; 325 unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf); 326 327 /* ignore tiny modes */ 328 if (hactive < 64 || vactive < 64) 329 return NULL; 330 331 if (pt->misc & DRM_EDID_PT_STEREO) { 332 printk(KERN_WARNING "stereo mode not supported\n"); 333 return NULL; 334 } 335 if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { 336 printk(KERN_WARNING "integrated sync not supported\n"); 337 return NULL; 338 } 339 340 mode = drm_mode_create(dev); 341 if (!mode) 342 return NULL; 343 344 mode->type = DRM_MODE_TYPE_DRIVER; 345 346 if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH) 347 timing->pixel_clock = cpu_to_le16(1088); 348 349 mode->clock = le16_to_cpu(timing->pixel_clock) * 10; 350 351 mode->hdisplay = hactive; 352 mode->hsync_start = mode->hdisplay + hsync_offset; 353 mode->hsync_end = mode->hsync_start + hsync_pulse_width; 354 mode->htotal = mode->hdisplay + hblank; 355 356 mode->vdisplay = vactive; 357 mode->vsync_start = mode->vdisplay + vsync_offset; 358 mode->vsync_end = mode->vsync_start + vsync_pulse_width; 359 mode->vtotal = mode->vdisplay + vblank; 360 361 drm_mode_set_name(mode); 362 363 if (pt->misc & DRM_EDID_PT_INTERLACED) 364 mode->flags |= DRM_MODE_FLAG_INTERLACE; 365 366 if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { 367 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE; 368 } 369 370 mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? 371 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; 372 mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? 373 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; 374 375 mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4; 376 mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8; 377 378 if (quirks & EDID_QUIRK_DETAILED_IN_CM) { 379 mode->width_mm *= 10; 380 mode->height_mm *= 10; 381 } 382 383 if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) { 384 mode->width_mm = edid->width_cm * 10; 385 mode->height_mm = edid->height_cm * 10; 386 } 387 388 return mode; 389} 390 391/* 392 * Detailed mode info for the EDID "established modes" data to use. 393 */ 394static struct drm_display_mode edid_est_modes[] = { 395 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840, 396 968, 1056, 0, 600, 601, 605, 628, 0, 397 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */ 398 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824, 399 896, 1024, 0, 600, 601, 603, 625, 0, 400 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */ 401 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656, 402 720, 840, 0, 480, 481, 484, 500, 0, 403 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */ 404 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664, 405 704, 832, 0, 480, 489, 491, 520, 0, 406 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */ 407 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704, 408 768, 864, 0, 480, 483, 486, 525, 0, 409 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */ 410 { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656, 411 752, 800, 0, 480, 490, 492, 525, 0, 412 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */ 413 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738, 414 846, 900, 0, 400, 421, 423, 449, 0, 415 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */ 416 { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738, 417 846, 900, 0, 400, 412, 414, 449, 0, 418 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */ 419 { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296, 420 1440, 1688, 0, 1024, 1025, 1028, 1066, 0, 421 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */ 422 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040, 423 1136, 1312, 0, 768, 769, 772, 800, 0, 424 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */ 425 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048, 426 1184, 1328, 0, 768, 771, 777, 806, 0, 427 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */ 428 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048, 429 1184, 1344, 0, 768, 771, 777, 806, 0, 430 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */ 431 { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032, 432 1208, 1264, 0, 768, 768, 776, 817, 0, 433 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */ 434 { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864, 435 928, 1152, 0, 624, 625, 628, 667, 0, 436 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */ 437 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816, 438 896, 1056, 0, 600, 601, 604, 625, 0, 439 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */ 440 { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856, 441 976, 1040, 0, 600, 637, 643, 666, 0, 442 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */ 443 { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216, 444 1344, 1600, 0, 864, 865, 868, 900, 0, 445 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */ 446}; 447 448#define EDID_EST_TIMINGS 16 449#define EDID_STD_TIMINGS 8 450#define EDID_DETAILED_TIMINGS 4 451 452/** 453 * add_established_modes - get est. modes from EDID and add them 454 * @edid: EDID block to scan 455 * 456 * Each EDID block contains a bitmap of the supported "established modes" list 457 * (defined above). Tease them out and add them to the global modes list. 458 */ 459static int add_established_modes(struct drm_connector *connector, struct edid *edid) 460{ 461 struct drm_device *dev = connector->dev; 462 unsigned long est_bits = edid->established_timings.t1 | 463 (edid->established_timings.t2 << 8) | 464 ((edid->established_timings.mfg_rsvd & 0x80) << 9); 465 int i, modes = 0; 466 467 for (i = 0; i <= EDID_EST_TIMINGS; i++) 468 if (est_bits & (1<<i)) { 469 struct drm_display_mode *newmode; 470 newmode = drm_mode_duplicate(dev, &edid_est_modes[i]); 471 if (newmode) { 472 drm_mode_probed_add(connector, newmode); 473 modes++; 474 } 475 } 476 477 return modes; 478} 479/** 480 * stanard_timing_level - get std. timing level(CVT/GTF/DMT) 481 * @edid: EDID block to scan 482 */ 483static int standard_timing_level(struct edid *edid) 484{ 485 if (edid->revision >= 2) { 486 if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)) 487 return LEVEL_CVT; 488 return LEVEL_GTF; 489 } 490 return LEVEL_DMT; 491} 492 493/** 494 * add_standard_modes - get std. modes from EDID and add them 495 * @edid: EDID block to scan 496 * 497 * Standard modes can be calculated using the CVT standard. Grab them from 498 * @edid, calculate them, and add them to the list. 499 */ 500static int add_standard_modes(struct drm_connector *connector, struct edid *edid) 501{ 502 struct drm_device *dev = connector->dev; 503 int i, modes = 0; 504 int timing_level; 505 506 timing_level = standard_timing_level(edid); 507 508 for (i = 0; i < EDID_STD_TIMINGS; i++) { 509 struct std_timing *t = &edid->standard_timings[i]; 510 struct drm_display_mode *newmode; 511 512 /* If std timings bytes are 1, 1 it's empty */ 513 if (t->hsize == 1 && t->vfreq_aspect == 1) 514 continue; 515 516 newmode = drm_mode_std(dev, &edid->standard_timings[i], 517 timing_level); 518 if (newmode) { 519 drm_mode_probed_add(connector, newmode); 520 modes++; 521 } 522 } 523 524 return modes; 525} 526 527/** 528 * add_detailed_modes - get detailed mode info from EDID data 529 * @connector: attached connector 530 * @edid: EDID block to scan 531 * @quirks: quirks to apply 532 * 533 * Some of the detailed timing sections may contain mode information. Grab 534 * it and add it to the list. 535 */ 536static int add_detailed_info(struct drm_connector *connector, 537 struct edid *edid, u32 quirks) 538{ 539 struct drm_device *dev = connector->dev; 540 int i, j, modes = 0; 541 int timing_level; 542 543 timing_level = standard_timing_level(edid); 544 545 for (i = 0; i < EDID_DETAILED_TIMINGS; i++) { 546 struct detailed_timing *timing = &edid->detailed_timings[i]; 547 struct detailed_non_pixel *data = &timing->data.other_data; 548 struct drm_display_mode *newmode; 549 550 /* EDID up to and including 1.2 may put monitor info here */ 551 if (edid->version == 1 && edid->revision < 3) 552 continue; 553 554 /* Detailed mode timing */ 555 if (timing->pixel_clock) { 556 newmode = drm_mode_detailed(dev, edid, timing, quirks); 557 if (!newmode) 558 continue; 559 560 /* First detailed mode is preferred */ 561 if (i == 0 && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING)) 562 newmode->type |= DRM_MODE_TYPE_PREFERRED; 563 drm_mode_probed_add(connector, newmode); 564 565 modes++; 566 continue; 567 } 568 569 /* Other timing or info */ 570 switch (data->type) { 571 case EDID_DETAIL_MONITOR_SERIAL: 572 break; 573 case EDID_DETAIL_MONITOR_STRING: 574 break; 575 case EDID_DETAIL_MONITOR_RANGE: 576 /* Get monitor range data */ 577 break; 578 case EDID_DETAIL_MONITOR_NAME: 579 break; 580 case EDID_DETAIL_MONITOR_CPDATA: 581 break; 582 case EDID_DETAIL_STD_MODES: 583 /* Five modes per detailed section */ 584 for (j = 0; j < 5; i++) { 585 struct std_timing *std; 586 struct drm_display_mode *newmode; 587 588 std = &data->data.timings[j]; 589 newmode = drm_mode_std(dev, std, 590 timing_level); 591 if (newmode) { 592 drm_mode_probed_add(connector, newmode); 593 modes++; 594 } 595 } 596 break; 597 default: 598 break; 599 } 600 } 601 602 return modes; 603} 604 605#define DDC_ADDR 0x50 606/** 607 * Get EDID information via I2C. 608 * 609 * \param adapter : i2c device adaptor 610 * \param buf : EDID data buffer to be filled 611 * \param len : EDID data buffer length 612 * \return 0 on success or -1 on failure. 613 * 614 * Try to fetch EDID information by calling i2c driver function. 615 */ 616int drm_do_probe_ddc_edid(struct i2c_adapter *adapter, 617 unsigned char *buf, int len) 618{ 619 unsigned char start = 0x0; 620 struct i2c_msg msgs[] = { 621 { 622 .addr = DDC_ADDR, 623 .flags = 0, 624 .len = 1, 625 .buf = &start, 626 }, { 627 .addr = DDC_ADDR, 628 .flags = I2C_M_RD, 629 .len = len, 630 .buf = buf, 631 } 632 }; 633 634 if (i2c_transfer(adapter, msgs, 2) == 2) 635 return 0; 636 637 dev_info(&adapter->dev, "unable to read EDID block.\n"); 638 return -1; 639} 640EXPORT_SYMBOL(drm_do_probe_ddc_edid); 641 642static int drm_ddc_read_edid(struct drm_connector *connector, 643 struct i2c_adapter *adapter, 644 char *buf, int len) 645{ 646 int ret; 647 648 ret = drm_do_probe_ddc_edid(adapter, buf, len); 649 if (ret != 0) { 650 dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n", 651 drm_get_connector_name(connector)); 652 goto end; 653 } 654 if (!edid_is_valid((struct edid *)buf)) { 655 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 656 drm_get_connector_name(connector)); 657 ret = -1; 658 } 659end: 660 return ret; 661} 662 663#define MAX_EDID_EXT_NUM 4 664/** 665 * drm_get_edid - get EDID data, if available 666 * @connector: connector we're probing 667 * @adapter: i2c adapter to use for DDC 668 * 669 * Poke the given connector's i2c channel to grab EDID data if possible. 670 * 671 * Return edid data or NULL if we couldn't find any. 672 */ 673struct edid *drm_get_edid(struct drm_connector *connector, 674 struct i2c_adapter *adapter) 675{ 676 int ret; 677 struct edid *edid; 678 679 edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1), 680 GFP_KERNEL); 681 if (edid == NULL) { 682 dev_warn(&connector->dev->pdev->dev, 683 "Failed to allocate EDID\n"); 684 goto end; 685 } 686 687 /* Read first EDID block */ 688 ret = drm_ddc_read_edid(connector, adapter, 689 (unsigned char *)edid, EDID_LENGTH); 690 if (ret != 0) 691 goto clean_up; 692 693 /* There are EDID extensions to be read */ 694 if (edid->extensions != 0) { 695 int edid_ext_num = edid->extensions; 696 697 if (edid_ext_num > MAX_EDID_EXT_NUM) { 698 dev_warn(&connector->dev->pdev->dev, 699 "The number of extension(%d) is " 700 "over max (%d), actually read number (%d)\n", 701 edid_ext_num, MAX_EDID_EXT_NUM, 702 MAX_EDID_EXT_NUM); 703 /* Reset EDID extension number to be read */ 704 edid_ext_num = MAX_EDID_EXT_NUM; 705 } 706 /* Read EDID including extensions too */ 707 ret = drm_ddc_read_edid(connector, adapter, (char *)edid, 708 EDID_LENGTH * (edid_ext_num + 1)); 709 if (ret != 0) 710 goto clean_up; 711 712 } 713 714 connector->display_info.raw_edid = (char *)edid; 715 goto end; 716 717clean_up: 718 kfree(edid); 719 edid = NULL; 720end: 721 return edid; 722 723} 724EXPORT_SYMBOL(drm_get_edid); 725 726#define HDMI_IDENTIFIER 0x000C03 727#define VENDOR_BLOCK 0x03 728/** 729 * drm_detect_hdmi_monitor - detect whether monitor is hdmi. 730 * @edid: monitor EDID information 731 * 732 * Parse the CEA extension according to CEA-861-B. 733 * Return true if HDMI, false if not or unknown. 734 */ 735bool drm_detect_hdmi_monitor(struct edid *edid) 736{ 737 char *edid_ext = NULL; 738 int i, hdmi_id, edid_ext_num; 739 int start_offset, end_offset; 740 bool is_hdmi = false; 741 742 /* No EDID or EDID extensions */ 743 if (edid == NULL || edid->extensions == 0) 744 goto end; 745 746 /* Chose real EDID extension number */ 747 edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ? 748 MAX_EDID_EXT_NUM : edid->extensions; 749 750 /* Find CEA extension */ 751 for (i = 0; i < edid_ext_num; i++) { 752 edid_ext = (char *)edid + EDID_LENGTH * (i + 1); 753 /* This block is CEA extension */ 754 if (edid_ext[0] == 0x02) 755 break; 756 } 757 758 if (i == edid_ext_num) 759 goto end; 760 761 /* Data block offset in CEA extension block */ 762 start_offset = 4; 763 end_offset = edid_ext[2]; 764 765 /* 766 * Because HDMI identifier is in Vendor Specific Block, 767 * search it from all data blocks of CEA extension. 768 */ 769 for (i = start_offset; i < end_offset; 770 /* Increased by data block len */ 771 i += ((edid_ext[i] & 0x1f) + 1)) { 772 /* Find vendor specific block */ 773 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { 774 hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | 775 edid_ext[i + 3] << 16; 776 /* Find HDMI identifier */ 777 if (hdmi_id == HDMI_IDENTIFIER) 778 is_hdmi = true; 779 break; 780 } 781 } 782 783end: 784 return is_hdmi; 785} 786EXPORT_SYMBOL(drm_detect_hdmi_monitor); 787 788/** 789 * drm_add_edid_modes - add modes from EDID data, if available 790 * @connector: connector we're probing 791 * @edid: edid data 792 * 793 * Add the specified modes to the connector's mode list. 794 * 795 * Return number of modes added or 0 if we couldn't find any. 796 */ 797int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 798{ 799 int num_modes = 0; 800 u32 quirks; 801 802 if (edid == NULL) { 803 return 0; 804 } 805 if (!edid_is_valid(edid)) { 806 dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", 807 drm_get_connector_name(connector)); 808 return 0; 809 } 810 811 quirks = edid_get_quirks(edid); 812 813 num_modes += add_established_modes(connector, edid); 814 num_modes += add_standard_modes(connector, edid); 815 num_modes += add_detailed_info(connector, edid, quirks); 816 817 if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) 818 edid_fixup_preferred(connector, quirks); 819 820 connector->display_info.serration_vsync = (edid->input & DRM_EDID_INPUT_SERRATION_VSYNC) ? 1 : 0; 821 connector->display_info.sync_on_green = (edid->input & DRM_EDID_INPUT_SYNC_ON_GREEN) ? 1 : 0; 822 connector->display_info.composite_sync = (edid->input & DRM_EDID_INPUT_COMPOSITE_SYNC) ? 1 : 0; 823 connector->display_info.separate_syncs = (edid->input & DRM_EDID_INPUT_SEPARATE_SYNCS) ? 1 : 0; 824 connector->display_info.blank_to_black = (edid->input & DRM_EDID_INPUT_BLANK_TO_BLACK) ? 1 : 0; 825 connector->display_info.video_level = (edid->input & DRM_EDID_INPUT_VIDEO_LEVEL) >> 5; 826 connector->display_info.digital = (edid->input & DRM_EDID_INPUT_DIGITAL) ? 1 : 0; 827 connector->display_info.width_mm = edid->width_cm * 10; 828 connector->display_info.height_mm = edid->height_cm * 10; 829 connector->display_info.gamma = edid->gamma; 830 connector->display_info.gtf_supported = (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF) ? 1 : 0; 831 connector->display_info.standard_color = (edid->features & DRM_EDID_FEATURE_STANDARD_COLOR) ? 1 : 0; 832 connector->display_info.display_type = (edid->features & DRM_EDID_FEATURE_DISPLAY_TYPE) >> 3; 833 connector->display_info.active_off_supported = (edid->features & DRM_EDID_FEATURE_PM_ACTIVE_OFF) ? 1 : 0; 834 connector->display_info.suspend_supported = (edid->features & DRM_EDID_FEATURE_PM_SUSPEND) ? 1 : 0; 835 connector->display_info.standby_supported = (edid->features & DRM_EDID_FEATURE_PM_STANDBY) ? 1 : 0; 836 connector->display_info.gamma = edid->gamma; 837 838 return num_modes; 839} 840EXPORT_SYMBOL(drm_add_edid_modes); 841