1/*
   2 * Copyright (c) 2006 Luc Verhaegen (quirks list)
   3 * Copyright (c) 2007-2008 Intel Corporation
   4 *   Jesse Barnes <jesse.barnes@intel.com>
   5 * Copyright 2010 Red Hat, Inc.
   6 *
   7 * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
   8 * FB layer.
   9 *   Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
  10 *
  11 * Permission is hereby granted, free of charge, to any person obtaining a
  12 * copy of this software and associated documentation files (the "Software"),
  13 * to deal in the Software without restriction, including without limitation
  14 * the rights to use, copy, modify, merge, publish, distribute, sub license,
  15 * and/or sell copies of the Software, and to permit persons to whom the
  16 * Software is furnished to do so, subject to the following conditions:
  17 *
  18 * The above copyright notice and this permission notice (including the
  19 * next paragraph) shall be included in all copies or substantial portions
  20 * of the Software.
  21 *
  22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  28 * DEALINGS IN THE SOFTWARE.
  29 */
  30#include <linux/kernel.h>
  31#include <linux/slab.h>
 
  32#include <linux/i2c.h>
  33#include "drmP.h"
  34#include "drm_edid.h"
  35#include "drm_edid_modes.h"
  36
  37#define version_greater(edid, maj, min) \
  38	(((edid)->version > (maj)) || \
  39	 ((edid)->version == (maj) && (edid)->revision > (min)))
  40
  41#define EDID_EST_TIMINGS 16
  42#define EDID_STD_TIMINGS 8
  43#define EDID_DETAILED_TIMINGS 4
  44
  45/*
  46 * EDID blocks out in the wild have a variety of bugs, try to collect
  47 * them here (note that userspace may work around broken monitors first,
  48 * but fixes should make their way here so that the kernel "just works"
  49 * on as many displays as possible).
  50 */
  51
  52/* First detailed mode wrong, use largest 60Hz mode */
  53#define EDID_QUIRK_PREFER_LARGE_60		(1 << 0)
  54/* Reported 135MHz pixel clock is too high, needs adjustment */
  55#define EDID_QUIRK_135_CLOCK_TOO_HIGH		(1 << 1)
  56/* Prefer the largest mode at 75 Hz */
  57#define EDID_QUIRK_PREFER_LARGE_75		(1 << 2)
  58/* Detail timing is in cm not mm */
  59#define EDID_QUIRK_DETAILED_IN_CM		(1 << 3)
  60/* Detailed timing descriptors have bogus size values, so just take the
  61 * maximum size and use that.
  62 */
  63#define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE	(1 << 4)
  64/* Monitor forgot to set the first detailed is preferred bit. */
  65#define EDID_QUIRK_FIRST_DETAILED_PREFERRED	(1 << 5)
  66/* use +hsync +vsync for detailed mode */
  67#define EDID_QUIRK_DETAILED_SYNC_PP		(1 << 6)
 
 
 
 
  68
  69struct detailed_mode_closure {
  70	struct drm_connector *connector;
  71	struct edid *edid;
  72	bool preferred;
  73	u32 quirks;
  74	int modes;
  75};
  76
  77#define LEVEL_DMT	0
  78#define LEVEL_GTF	1
  79#define LEVEL_GTF2	2
  80#define LEVEL_CVT	3
  81
  82static struct edid_quirk {
  83	char *vendor;
  84	int product_id;
  85	u32 quirks;
  86} edid_quirk_list[] = {
  87	/* Acer AL1706 */
  88	{ "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
  89	/* Acer F51 */
  90	{ "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
  91	/* Unknown Acer */
  92	{ "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  93
  94	/* Belinea 10 15 55 */
  95	{ "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
  96	{ "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
  97
  98	/* Envision Peripherals, Inc. EN-7100e */
  99	{ "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
 100	/* Envision EN2028 */
 101	{ "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
 102
 103	/* Funai Electronics PM36B */
 104	{ "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
 105	  EDID_QUIRK_DETAILED_IN_CM },
 106
 107	/* LG Philips LCD LP154W01-A5 */
 108	{ "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
 109	{ "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
 110
 111	/* Philips 107p5 CRT */
 112	{ "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
 113
 114	/* Proview AY765C */
 115	{ "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
 116
 117	/* Samsung SyncMaster 205BW.  Note: irony */
 118	{ "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
 119	/* Samsung SyncMaster 22[5-6]BW */
 120	{ "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
 121	{ "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 122};
 123
 124/*** DDC fetch and block validation ***/
 125
 126static const u8 edid_header[] = {
 127	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
 128};
 129
 130 /*
 131 * Sanity check the header of the base EDID block.  Return 8 if the header
 132 * is perfect, down to 0 if it's totally wrong.
 133 */
 134int drm_edid_header_is_valid(const u8 *raw_edid)
 135{
 136	int i, score = 0;
 137
 138	for (i = 0; i < sizeof(edid_header); i++)
 139		if (raw_edid[i] == edid_header[i])
 140			score++;
 141
 142	return score;
 143}
 144EXPORT_SYMBOL(drm_edid_header_is_valid);
 145
 
 
 
 
 146
 147/*
 148 * Sanity check the EDID block (base or extension).  Return 0 if the block
 149 * doesn't check out, or 1 if it's valid.
 150 */
 151static bool
 152drm_edid_block_valid(u8 *raw_edid)
 153{
 154	int i;
 155	u8 csum = 0;
 156	struct edid *edid = (struct edid *)raw_edid;
 157
 158	if (raw_edid[0] == 0x00) {
 
 
 
 
 
 
 159		int score = drm_edid_header_is_valid(raw_edid);
 160		if (score == 8) ;
 161		else if (score >= 6) {
 162			DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
 163			memcpy(raw_edid, edid_header, sizeof(edid_header));
 164		} else {
 165			goto bad;
 166		}
 167	}
 168
 169	for (i = 0; i < EDID_LENGTH; i++)
 170		csum += raw_edid[i];
 171	if (csum) {
 172		DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
 
 
 173
 174		/* allow CEA to slide through, switches mangle this */
 175		if (raw_edid[0] != 0x02)
 176			goto bad;
 177	}
 178
 179	/* per-block-type checks */
 180	switch (raw_edid[0]) {
 181	case 0: /* base */
 182		if (edid->version != 1) {
 183			DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
 184			goto bad;
 185		}
 186
 187		if (edid->revision > 4)
 188			DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
 189		break;
 190
 191	default:
 192		break;
 193	}
 194
 195	return 1;
 196
 197bad:
 198	if (raw_edid) {
 199		printk(KERN_ERR "Raw EDID:\n");
 200		print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
 201			       raw_edid, EDID_LENGTH, false);
 202	}
 203	return 0;
 204}
 
 205
 206/**
 207 * drm_edid_is_valid - sanity check EDID data
 208 * @edid: EDID data
 209 *
 210 * Sanity-check an entire EDID record (including extensions)
 211 */
 212bool drm_edid_is_valid(struct edid *edid)
 213{
 214	int i;
 215	u8 *raw = (u8 *)edid;
 216
 217	if (!edid)
 218		return false;
 219
 220	for (i = 0; i <= edid->extensions; i++)
 221		if (!drm_edid_block_valid(raw + i * EDID_LENGTH))
 222			return false;
 223
 224	return true;
 225}
 226EXPORT_SYMBOL(drm_edid_is_valid);
 227
 228#define DDC_ADDR 0x50
 229#define DDC_SEGMENT_ADDR 0x30
 230/**
 231 * Get EDID information via I2C.
 232 *
 233 * \param adapter : i2c device adaptor
 234 * \param buf     : EDID data buffer to be filled
 235 * \param len     : EDID data buffer length
 236 * \return 0 on success or -1 on failure.
 
 
 
 
 237 *
 238 * Try to fetch EDID information by calling i2c driver function.
 239 */
 240static int
 241drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
 242		      int block, int len)
 243{
 244	unsigned char start = block * EDID_LENGTH;
 
 
 245	int ret, retries = 5;
 246
 247	/* The core i2c driver will automatically retry the transfer if the
 248	 * adapter reports EAGAIN. However, we find that bit-banging transfers
 249	 * are susceptible to errors under a heavily loaded machine and
 250	 * generate spurious NAKs and timeouts. Retrying the transfer
 251	 * of the individual block a few times seems to overcome this.
 252	 */
 253	do {
 254		struct i2c_msg msgs[] = {
 255			{
 
 
 
 
 
 256				.addr	= DDC_ADDR,
 257				.flags	= 0,
 258				.len	= 1,
 259				.buf	= &start,
 260			}, {
 261				.addr	= DDC_ADDR,
 262				.flags	= I2C_M_RD,
 263				.len	= len,
 264				.buf	= buf,
 265			}
 266		};
 267		ret = i2c_transfer(adapter, msgs, 2);
 268	} while (ret != 2 && --retries);
 269
 270	return ret == 2 ? 0 : -1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 271}
 272
 273static bool drm_edid_is_zero(u8 *in_edid, int length)
 274{
 275	int i;
 276	u32 *raw_edid = (u32 *)in_edid;
 277
 278	for (i = 0; i < length / 4; i++)
 279		if (*(raw_edid + i) != 0)
 280			return false;
 281	return true;
 282}
 283
 284static u8 *
 285drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
 286{
 287	int i, j = 0, valid_extensions = 0;
 288	u8 *block, *new;
 
 289
 290	if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
 291		return NULL;
 292
 293	/* base block fetch */
 294	for (i = 0; i < 4; i++) {
 295		if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
 296			goto out;
 297		if (drm_edid_block_valid(block))
 298			break;
 299		if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {
 300			connector->null_edid_counter++;
 301			goto carp;
 302		}
 303	}
 304	if (i == 4)
 305		goto carp;
 306
 307	/* if there's no extensions, we're done */
 308	if (block[0x7e] == 0)
 309		return block;
 310
 311	new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
 312	if (!new)
 313		goto out;
 314	block = new;
 315
 316	for (j = 1; j <= block[0x7e]; j++) {
 317		for (i = 0; i < 4; i++) {
 318			if (drm_do_probe_ddc_edid(adapter,
 319				  block + (valid_extensions + 1) * EDID_LENGTH,
 320				  j, EDID_LENGTH))
 321				goto out;
 322			if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) {
 323				valid_extensions++;
 324				break;
 325			}
 326		}
 327		if (i == 4)
 
 328			dev_warn(connector->dev->dev,
 329			 "%s: Ignoring invalid EDID block %d.\n",
 330			 drm_get_connector_name(connector), j);
 
 
 
 331	}
 332
 333	if (valid_extensions != block[0x7e]) {
 334		block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
 335		block[0x7e] = valid_extensions;
 336		new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
 337		if (!new)
 338			goto out;
 339		block = new;
 340	}
 341
 342	return block;
 343
 344carp:
 345	dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",
 346		 drm_get_connector_name(connector), j);
 
 
 
 347
 348out:
 349	kfree(block);
 350	return NULL;
 351}
 352
 353/**
 354 * Probe DDC presence.
 
 
 
 355 *
 356 * \param adapter : i2c device adaptor
 357 * \return 1 on success
 358 */
 359static bool
 360drm_probe_ddc(struct i2c_adapter *adapter)
 361{
 362	unsigned char out;
 363
 364	return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
 365}
 
 366
 367/**
 368 * drm_get_edid - get EDID data, if available
 369 * @connector: connector we're probing
 370 * @adapter: i2c adapter to use for DDC
 371 *
 372 * Poke the given i2c channel to grab EDID data if possible.  If found,
 373 * attach it to the connector.
 374 *
 375 * Return edid data or NULL if we couldn't find any.
 376 */
 377struct edid *drm_get_edid(struct drm_connector *connector,
 378			  struct i2c_adapter *adapter)
 379{
 380	struct edid *edid = NULL;
 381
 382	if (drm_probe_ddc(adapter))
 383		edid = (struct edid *)drm_do_get_edid(connector, adapter);
 384
 385	connector->display_info.raw_edid = (char *)edid;
 386
 387	return edid;
 388
 389}
 390EXPORT_SYMBOL(drm_get_edid);
 391
 
 
 
 
 
 
 
 
 
 
 
 
 392/*** EDID parsing ***/
 393
 394/**
 395 * edid_vendor - match a string against EDID's obfuscated vendor field
 396 * @edid: EDID to match
 397 * @vendor: vendor string
 398 *
 399 * Returns true if @vendor is in @edid, false otherwise
 400 */
 401static bool edid_vendor(struct edid *edid, char *vendor)
 402{
 403	char edid_vendor[3];
 404
 405	edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
 406	edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
 407			  ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
 408	edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
 409
 410	return !strncmp(edid_vendor, vendor, 3);
 411}
 412
 413/**
 414 * edid_get_quirks - return quirk flags for a given EDID
 415 * @edid: EDID to process
 416 *
 417 * This tells subsequent routines what fixes they need to apply.
 418 */
 419static u32 edid_get_quirks(struct edid *edid)
 420{
 421	struct edid_quirk *quirk;
 422	int i;
 423
 424	for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
 425		quirk = &edid_quirk_list[i];
 426
 427		if (edid_vendor(edid, quirk->vendor) &&
 428		    (EDID_PRODUCT_ID(edid) == quirk->product_id))
 429			return quirk->quirks;
 430	}
 431
 432	return 0;
 433}
 434
 435#define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
 436#define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
 437
 438/**
 439 * edid_fixup_preferred - set preferred modes based on quirk list
 440 * @connector: has mode list to fix up
 441 * @quirks: quirks list
 442 *
 443 * Walk the mode list for @connector, clearing the preferred status
 444 * on existing modes and setting it anew for the right mode ala @quirks.
 445 */
 446static void edid_fixup_preferred(struct drm_connector *connector,
 447				 u32 quirks)
 448{
 449	struct drm_display_mode *t, *cur_mode, *preferred_mode;
 450	int target_refresh = 0;
 
 451
 452	if (list_empty(&connector->probed_modes))
 453		return;
 454
 455	if (quirks & EDID_QUIRK_PREFER_LARGE_60)
 456		target_refresh = 60;
 457	if (quirks & EDID_QUIRK_PREFER_LARGE_75)
 458		target_refresh = 75;
 459
 460	preferred_mode = list_first_entry(&connector->probed_modes,
 461					  struct drm_display_mode, head);
 462
 463	list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
 464		cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
 465
 466		if (cur_mode == preferred_mode)
 467			continue;
 468
 469		/* Largest mode is preferred */
 470		if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
 471			preferred_mode = cur_mode;
 472
 
 
 
 
 473		/* At a given size, try to get closest to target refresh */
 474		if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
 475		    MODE_REFRESH_DIFF(cur_mode, target_refresh) <
 476		    MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
 477			preferred_mode = cur_mode;
 478		}
 479	}
 480
 481	preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
 482}
 483
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 484struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
 485					   int hsize, int vsize, int fresh)
 
 486{
 487	struct drm_display_mode *mode = NULL;
 488	int i;
 489
 490	for (i = 0; i < drm_num_dmt_modes; i++) {
 491		const struct drm_display_mode *ptr = &drm_dmt_modes[i];
 492		if (hsize == ptr->hdisplay &&
 493			vsize == ptr->vdisplay &&
 494			fresh == drm_mode_vrefresh(ptr)) {
 495			/* get the expected default mode */
 496			mode = drm_mode_duplicate(dev, ptr);
 497			break;
 498		}
 
 
 
 499	}
 500	return mode;
 
 501}
 502EXPORT_SYMBOL(drm_mode_find_dmt);
 503
 504typedef void detailed_cb(struct detailed_timing *timing, void *closure);
 505
 506static void
 507cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
 508{
 509	int i, n = 0;
 510	u8 rev = ext[0x01], d = ext[0x02];
 511	u8 *det_base = ext + d;
 512
 513	switch (rev) {
 514	case 0:
 515		/* can't happen */
 516		return;
 517	case 1:
 518		/* have to infer how many blocks we have, check pixel clock */
 519		for (i = 0; i < 6; i++)
 520			if (det_base[18*i] || det_base[18*i+1])
 521				n++;
 522		break;
 523	default:
 524		/* explicit count */
 525		n = min(ext[0x03] & 0x0f, 6);
 526		break;
 527	}
 528
 529	for (i = 0; i < n; i++)
 530		cb((struct detailed_timing *)(det_base + 18 * i), closure);
 531}
 532
 533static void
 534vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
 535{
 536	unsigned int i, n = min((int)ext[0x02], 6);
 537	u8 *det_base = ext + 5;
 538
 539	if (ext[0x01] != 1)
 540		return; /* unknown version */
 541
 542	for (i = 0; i < n; i++)
 543		cb((struct detailed_timing *)(det_base + 18 * i), closure);
 544}
 545
 546static void
 547drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
 548{
 549	int i;
 550	struct edid *edid = (struct edid *)raw_edid;
 551
 552	if (edid == NULL)
 553		return;
 554
 555	for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
 556		cb(&(edid->detailed_timings[i]), closure);
 557
 558	for (i = 1; i <= raw_edid[0x7e]; i++) {
 559		u8 *ext = raw_edid + (i * EDID_LENGTH);
 560		switch (*ext) {
 561		case CEA_EXT:
 562			cea_for_each_detailed_block(ext, cb, closure);
 563			break;
 564		case VTB_EXT:
 565			vtb_for_each_detailed_block(ext, cb, closure);
 566			break;
 567		default:
 568			break;
 569		}
 570	}
 571}
 572
 573static void
 574is_rb(struct detailed_timing *t, void *data)
 575{
 576	u8 *r = (u8 *)t;
 577	if (r[3] == EDID_DETAIL_MONITOR_RANGE)
 578		if (r[15] & 0x10)
 579			*(bool *)data = true;
 580}
 581
 582/* EDID 1.4 defines this explicitly.  For EDID 1.3, we guess, badly. */
 583static bool
 584drm_monitor_supports_rb(struct edid *edid)
 585{
 586	if (edid->revision >= 4) {
 587		bool ret;
 588		drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
 589		return ret;
 590	}
 591
 592	return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
 593}
 594
 595static void
 596find_gtf2(struct detailed_timing *t, void *data)
 597{
 598	u8 *r = (u8 *)t;
 599	if (r[3] == EDID_DETAIL_MONITOR_RANGE && r[10] == 0x02)
 600		*(u8 **)data = r;
 601}
 602
 603/* Secondary GTF curve kicks in above some break frequency */
 604static int
 605drm_gtf2_hbreak(struct edid *edid)
 606{
 607	u8 *r = NULL;
 608	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 609	return r ? (r[12] * 2) : 0;
 610}
 611
 612static int
 613drm_gtf2_2c(struct edid *edid)
 614{
 615	u8 *r = NULL;
 616	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 617	return r ? r[13] : 0;
 618}
 619
 620static int
 621drm_gtf2_m(struct edid *edid)
 622{
 623	u8 *r = NULL;
 624	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 625	return r ? (r[15] << 8) + r[14] : 0;
 626}
 627
 628static int
 629drm_gtf2_k(struct edid *edid)
 630{
 631	u8 *r = NULL;
 632	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 633	return r ? r[16] : 0;
 634}
 635
 636static int
 637drm_gtf2_2j(struct edid *edid)
 638{
 639	u8 *r = NULL;
 640	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &r);
 641	return r ? r[17] : 0;
 642}
 643
 644/**
 645 * standard_timing_level - get std. timing level(CVT/GTF/DMT)
 646 * @edid: EDID block to scan
 647 */
 648static int standard_timing_level(struct edid *edid)
 649{
 650	if (edid->revision >= 2) {
 651		if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))
 652			return LEVEL_CVT;
 653		if (drm_gtf2_hbreak(edid))
 654			return LEVEL_GTF2;
 655		return LEVEL_GTF;
 656	}
 657	return LEVEL_DMT;
 658}
 659
 660/*
 661 * 0 is reserved.  The spec says 0x01 fill for unused timings.  Some old
 662 * monitors fill with ascii space (0x20) instead.
 663 */
 664static int
 665bad_std_timing(u8 a, u8 b)
 666{
 667	return (a == 0x00 && b == 0x00) ||
 668	       (a == 0x01 && b == 0x01) ||
 669	       (a == 0x20 && b == 0x20);
 670}
 671
 672/**
 673 * drm_mode_std - convert standard mode info (width, height, refresh) into mode
 
 
 674 * @t: standard timing params
 675 * @timing_level: standard timing level
 676 *
 677 * Take the standard timing params (in this case width, aspect, and refresh)
 678 * and convert them into a real mode using CVT/GTF/DMT.
 679 */
 680static struct drm_display_mode *
 681drm_mode_std(struct drm_connector *connector, struct edid *edid,
 682	     struct std_timing *t, int revision)
 683{
 684	struct drm_device *dev = connector->dev;
 685	struct drm_display_mode *m, *mode = NULL;
 686	int hsize, vsize;
 687	int vrefresh_rate;
 688	unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
 689		>> EDID_TIMING_ASPECT_SHIFT;
 690	unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
 691		>> EDID_TIMING_VFREQ_SHIFT;
 692	int timing_level = standard_timing_level(edid);
 693
 694	if (bad_std_timing(t->hsize, t->vfreq_aspect))
 695		return NULL;
 696
 697	/* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
 698	hsize = t->hsize * 8 + 248;
 699	/* vrefresh_rate = vfreq + 60 */
 700	vrefresh_rate = vfreq + 60;
 701	/* the vdisplay is calculated based on the aspect ratio */
 702	if (aspect_ratio == 0) {
 703		if (revision < 3)
 704			vsize = hsize;
 705		else
 706			vsize = (hsize * 10) / 16;
 707	} else if (aspect_ratio == 1)
 708		vsize = (hsize * 3) / 4;
 709	else if (aspect_ratio == 2)
 710		vsize = (hsize * 4) / 5;
 711	else
 712		vsize = (hsize * 9) / 16;
 713
 714	/* HDTV hack, part 1 */
 715	if (vrefresh_rate == 60 &&
 716	    ((hsize == 1360 && vsize == 765) ||
 717	     (hsize == 1368 && vsize == 769))) {
 718		hsize = 1366;
 719		vsize = 768;
 720	}
 721
 722	/*
 723	 * If this connector already has a mode for this size and refresh
 724	 * rate (because it came from detailed or CVT info), use that
 725	 * instead.  This way we don't have to guess at interlace or
 726	 * reduced blanking.
 727	 */
 728	list_for_each_entry(m, &connector->probed_modes, head)
 729		if (m->hdisplay == hsize && m->vdisplay == vsize &&
 730		    drm_mode_vrefresh(m) == vrefresh_rate)
 731			return NULL;
 732
 733	/* HDTV hack, part 2 */
 734	if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
 735		mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
 736				    false);
 737		mode->hdisplay = 1366;
 738		mode->hsync_start = mode->hsync_start - 1;
 739		mode->hsync_end = mode->hsync_end - 1;
 740		return mode;
 741	}
 742
 743	/* check whether it can be found in default mode table */
 744	mode = drm_mode_find_dmt(dev, hsize, vsize, vrefresh_rate);
 
 
 
 
 
 
 745	if (mode)
 746		return mode;
 747
 
 748	switch (timing_level) {
 749	case LEVEL_DMT:
 750		break;
 751	case LEVEL_GTF:
 752		mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
 753		break;
 754	case LEVEL_GTF2:
 755		/*
 756		 * This is potentially wrong if there's ever a monitor with
 757		 * more than one ranges section, each claiming a different
 758		 * secondary GTF curve.  Please don't do that.
 759		 */
 760		mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
 
 
 761		if (drm_mode_hsync(mode) > drm_gtf2_hbreak(edid)) {
 762			kfree(mode);
 763			mode = drm_gtf_mode_complex(dev, hsize, vsize,
 764						    vrefresh_rate, 0, 0,
 765						    drm_gtf2_m(edid),
 766						    drm_gtf2_2c(edid),
 767						    drm_gtf2_k(edid),
 768						    drm_gtf2_2j(edid));
 769		}
 770		break;
 771	case LEVEL_CVT:
 772		mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0,
 773				    false);
 774		break;
 775	}
 776	return mode;
 777}
 778
 779/*
 780 * EDID is delightfully ambiguous about how interlaced modes are to be
 781 * encoded.  Our internal representation is of frame height, but some
 782 * HDTV detailed timings are encoded as field height.
 783 *
 784 * The format list here is from CEA, in frame size.  Technically we
 785 * should be checking refresh rate too.  Whatever.
 786 */
 787static void
 788drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
 789			    struct detailed_pixel_timing *pt)
 790{
 791	int i;
 792	static const struct {
 793		int w, h;
 794	} cea_interlaced[] = {
 795		{ 1920, 1080 },
 796		{  720,  480 },
 797		{ 1440,  480 },
 798		{ 2880,  480 },
 799		{  720,  576 },
 800		{ 1440,  576 },
 801		{ 2880,  576 },
 802	};
 803
 804	if (!(pt->misc & DRM_EDID_PT_INTERLACED))
 805		return;
 806
 807	for (i = 0; i < ARRAY_SIZE(cea_interlaced); i++) {
 808		if ((mode->hdisplay == cea_interlaced[i].w) &&
 809		    (mode->vdisplay == cea_interlaced[i].h / 2)) {
 810			mode->vdisplay *= 2;
 811			mode->vsync_start *= 2;
 812			mode->vsync_end *= 2;
 813			mode->vtotal *= 2;
 814			mode->vtotal |= 1;
 815		}
 816	}
 817
 818	mode->flags |= DRM_MODE_FLAG_INTERLACE;
 819}
 820
 821/**
 822 * drm_mode_detailed - create a new mode from an EDID detailed timing section
 823 * @dev: DRM device (needed to create new mode)
 824 * @edid: EDID block
 825 * @timing: EDID detailed timing info
 826 * @quirks: quirks to apply
 827 *
 828 * An EDID detailed timing block contains enough info for us to create and
 829 * return a new struct drm_display_mode.
 830 */
 831static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
 832						  struct edid *edid,
 833						  struct detailed_timing *timing,
 834						  u32 quirks)
 835{
 836	struct drm_display_mode *mode;
 837	struct detailed_pixel_timing *pt = &timing->data.pixel_data;
 838	unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
 839	unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
 840	unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
 841	unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
 842	unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
 843	unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
 844	unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
 845	unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
 846
 847	/* ignore tiny modes */
 848	if (hactive < 64 || vactive < 64)
 849		return NULL;
 850
 851	if (pt->misc & DRM_EDID_PT_STEREO) {
 852		printk(KERN_WARNING "stereo mode not supported\n");
 853		return NULL;
 854	}
 855	if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
 856		printk(KERN_WARNING "composite sync not supported\n");
 857	}
 858
 859	/* it is incorrect if hsync/vsync width is zero */
 860	if (!hsync_pulse_width || !vsync_pulse_width) {
 861		DRM_DEBUG_KMS("Incorrect Detailed timing. "
 862				"Wrong Hsync/Vsync pulse width\n");
 863		return NULL;
 864	}
 
 
 
 
 
 
 
 
 
 865	mode = drm_mode_create(dev);
 866	if (!mode)
 867		return NULL;
 868
 869	mode->type = DRM_MODE_TYPE_DRIVER;
 870
 871	if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
 872		timing->pixel_clock = cpu_to_le16(1088);
 873
 874	mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
 875
 876	mode->hdisplay = hactive;
 877	mode->hsync_start = mode->hdisplay + hsync_offset;
 878	mode->hsync_end = mode->hsync_start + hsync_pulse_width;
 879	mode->htotal = mode->hdisplay + hblank;
 880
 881	mode->vdisplay = vactive;
 882	mode->vsync_start = mode->vdisplay + vsync_offset;
 883	mode->vsync_end = mode->vsync_start + vsync_pulse_width;
 884	mode->vtotal = mode->vdisplay + vblank;
 885
 886	/* Some EDIDs have bogus h/vtotal values */
 887	if (mode->hsync_end > mode->htotal)
 888		mode->htotal = mode->hsync_end + 1;
 889	if (mode->vsync_end > mode->vtotal)
 890		mode->vtotal = mode->vsync_end + 1;
 891
 892	drm_mode_do_interlace_quirk(mode, pt);
 893
 894	drm_mode_set_name(mode);
 895
 896	if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
 897		pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
 898	}
 899
 900	mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
 901		DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
 902	mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
 903		DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
 904
 
 905	mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
 906	mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
 907
 908	if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
 909		mode->width_mm *= 10;
 910		mode->height_mm *= 10;
 911	}
 912
 913	if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
 914		mode->width_mm = edid->width_cm * 10;
 915		mode->height_mm = edid->height_cm * 10;
 916	}
 917
 918	return mode;
 919}
 
 920
 921static bool
 922mode_is_rb(const struct drm_display_mode *mode)
 923{
 924	return (mode->htotal - mode->hdisplay == 160) &&
 925	       (mode->hsync_end - mode->hdisplay == 80) &&
 926	       (mode->hsync_end - mode->hsync_start == 32) &&
 927	       (mode->vsync_start - mode->vdisplay == 3);
 928}
 929
 930static bool
 931mode_in_hsync_range(const struct drm_display_mode *mode,
 932		    struct edid *edid, u8 *t)
 933{
 934	int hsync, hmin, hmax;
 935
 936	hmin = t[7];
 937	if (edid->revision >= 4)
 938	    hmin += ((t[4] & 0x04) ? 255 : 0);
 939	hmax = t[8];
 940	if (edid->revision >= 4)
 941	    hmax += ((t[4] & 0x08) ? 255 : 0);
 942	hsync = drm_mode_hsync(mode);
 943
 944	return (hsync <= hmax && hsync >= hmin);
 945}
 946
 947static bool
 948mode_in_vsync_range(const struct drm_display_mode *mode,
 949		    struct edid *edid, u8 *t)
 950{
 951	int vsync, vmin, vmax;
 952
 953	vmin = t[5];
 954	if (edid->revision >= 4)
 955	    vmin += ((t[4] & 0x01) ? 255 : 0);
 956	vmax = t[6];
 957	if (edid->revision >= 4)
 958	    vmax += ((t[4] & 0x02) ? 255 : 0);
 959	vsync = drm_mode_vrefresh(mode);
 960
 961	return (vsync <= vmax && vsync >= vmin);
 962}
 963
 964static u32
 965range_pixel_clock(struct edid *edid, u8 *t)
 966{
 967	/* unspecified */
 968	if (t[9] == 0 || t[9] == 255)
 969		return 0;
 970
 971	/* 1.4 with CVT support gives us real precision, yay */
 972	if (edid->revision >= 4 && t[10] == 0x04)
 973		return (t[9] * 10000) - ((t[12] >> 2) * 250);
 974
 975	/* 1.3 is pathetic, so fuzz up a bit */
 976	return t[9] * 10000 + 5001;
 977}
 978
 979static bool
 980mode_in_range(const struct drm_display_mode *mode, struct edid *edid,
 981	      struct detailed_timing *timing)
 982{
 983	u32 max_clock;
 984	u8 *t = (u8 *)timing;
 985
 986	if (!mode_in_hsync_range(mode, edid, t))
 987		return false;
 988
 989	if (!mode_in_vsync_range(mode, edid, t))
 990		return false;
 991
 992	if ((max_clock = range_pixel_clock(edid, t)))
 993		if (mode->clock > max_clock)
 994			return false;
 995
 996	/* 1.4 max horizontal check */
 997	if (edid->revision >= 4 && t[10] == 0x04)
 998		if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))
 999			return false;
1000
1001	if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))
1002		return false;
1003
1004	return true;
1005}
1006
1007/*
1008 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will
1009 * need to account for them.
1010 */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1011static int
1012drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,
1013			struct detailed_timing *timing)
1014{
1015	int i, modes = 0;
1016	struct drm_display_mode *newmode;
1017	struct drm_device *dev = connector->dev;
1018
1019	for (i = 0; i < drm_num_dmt_modes; i++) {
1020		if (mode_in_range(drm_dmt_modes + i, edid, timing)) {
 
1021			newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);
1022			if (newmode) {
1023				drm_mode_probed_add(connector, newmode);
1024				modes++;
1025			}
1026		}
1027	}
1028
1029	return modes;
1030}
1031
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1032static void
1033do_inferred_modes(struct detailed_timing *timing, void *c)
1034{
1035	struct detailed_mode_closure *closure = c;
1036	struct detailed_non_pixel *data = &timing->data.other_data;
1037	int gtf = (closure->edid->features & DRM_EDID_FEATURE_DEFAULT_GTF);
 
 
 
1038
1039	if (gtf && data->type == EDID_DETAIL_MONITOR_RANGE)
 
 
 
 
 
 
 
 
 
1040		closure->modes += drm_gtf_modes_for_range(closure->connector,
1041							  closure->edid,
1042							  timing);
 
 
 
 
 
 
 
 
 
 
 
 
 
1043}
1044
1045static int
1046add_inferred_modes(struct drm_connector *connector, struct edid *edid)
1047{
1048	struct detailed_mode_closure closure = {
1049		connector, edid, 0, 0, 0
1050	};
1051
1052	if (version_greater(edid, 1, 0))
1053		drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
1054					    &closure);
1055
1056	return closure.modes;
1057}
1058
1059static int
1060drm_est3_modes(struct drm_connector *connector, struct detailed_timing *timing)
1061{
1062	int i, j, m, modes = 0;
1063	struct drm_display_mode *mode;
1064	u8 *est = ((u8 *)timing) + 5;
1065
1066	for (i = 0; i < 6; i++) {
1067		for (j = 7; j > 0; j--) {
1068			m = (i * 8) + (7 - j);
1069			if (m >= ARRAY_SIZE(est3_modes))
1070				break;
1071			if (est[i] & (1 << j)) {
1072				mode = drm_mode_find_dmt(connector->dev,
1073							 est3_modes[m].w,
1074							 est3_modes[m].h,
1075							 est3_modes[m].r
1076							 /*, est3_modes[m].rb */);
1077				if (mode) {
1078					drm_mode_probed_add(connector, mode);
1079					modes++;
1080				}
1081			}
1082		}
1083	}
1084
1085	return modes;
1086}
1087
1088static void
1089do_established_modes(struct detailed_timing *timing, void *c)
1090{
1091	struct detailed_mode_closure *closure = c;
1092	struct detailed_non_pixel *data = &timing->data.other_data;
1093
1094	if (data->type == EDID_DETAIL_EST_TIMINGS)
1095		closure->modes += drm_est3_modes(closure->connector, timing);
1096}
1097
1098/**
1099 * add_established_modes - get est. modes from EDID and add them
 
1100 * @edid: EDID block to scan
1101 *
1102 * Each EDID block contains a bitmap of the supported "established modes" list
1103 * (defined above).  Tease them out and add them to the global modes list.
1104 */
1105static int
1106add_established_modes(struct drm_connector *connector, struct edid *edid)
1107{
1108	struct drm_device *dev = connector->dev;
1109	unsigned long est_bits = edid->established_timings.t1 |
1110		(edid->established_timings.t2 << 8) |
1111		((edid->established_timings.mfg_rsvd & 0x80) << 9);
1112	int i, modes = 0;
1113	struct detailed_mode_closure closure = {
1114		connector, edid, 0, 0, 0
1115	};
1116
1117	for (i = 0; i <= EDID_EST_TIMINGS; i++) {
1118		if (est_bits & (1<<i)) {
1119			struct drm_display_mode *newmode;
1120			newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
1121			if (newmode) {
1122				drm_mode_probed_add(connector, newmode);
1123				modes++;
1124			}
1125		}
1126	}
1127
1128	if (version_greater(edid, 1, 0))
1129		    drm_for_each_detailed_block((u8 *)edid,
1130						do_established_modes, &closure);
1131
1132	return modes + closure.modes;
1133}
1134
1135static void
1136do_standard_modes(struct detailed_timing *timing, void *c)
1137{
1138	struct detailed_mode_closure *closure = c;
1139	struct detailed_non_pixel *data = &timing->data.other_data;
1140	struct drm_connector *connector = closure->connector;
1141	struct edid *edid = closure->edid;
1142
1143	if (data->type == EDID_DETAIL_STD_MODES) {
1144		int i;
1145		for (i = 0; i < 6; i++) {
1146			struct std_timing *std;
1147			struct drm_display_mode *newmode;
1148
1149			std = &data->data.timings[i];
1150			newmode = drm_mode_std(connector, edid, std,
1151					       edid->revision);
1152			if (newmode) {
1153				drm_mode_probed_add(connector, newmode);
1154				closure->modes++;
1155			}
1156		}
1157	}
1158}
1159
1160/**
1161 * add_standard_modes - get std. modes from EDID and add them
 
1162 * @edid: EDID block to scan
1163 *
1164 * Standard modes can be calculated using the appropriate standard (DMT,
1165 * GTF or CVT. Grab them from @edid and add them to the list.
1166 */
1167static int
1168add_standard_modes(struct drm_connector *connector, struct edid *edid)
1169{
1170	int i, modes = 0;
1171	struct detailed_mode_closure closure = {
1172		connector, edid, 0, 0, 0
1173	};
1174
1175	for (i = 0; i < EDID_STD_TIMINGS; i++) {
1176		struct drm_display_mode *newmode;
1177
1178		newmode = drm_mode_std(connector, edid,
1179				       &edid->standard_timings[i],
1180				       edid->revision);
1181		if (newmode) {
1182			drm_mode_probed_add(connector, newmode);
1183			modes++;
1184		}
1185	}
1186
1187	if (version_greater(edid, 1, 0))
1188		drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
1189					    &closure);
1190
1191	/* XXX should also look for standard codes in VTB blocks */
1192
1193	return modes + closure.modes;
1194}
1195
1196static int drm_cvt_modes(struct drm_connector *connector,
1197			 struct detailed_timing *timing)
1198{
1199	int i, j, modes = 0;
1200	struct drm_display_mode *newmode;
1201	struct drm_device *dev = connector->dev;
1202	struct cvt_timing *cvt;
1203	const int rates[] = { 60, 85, 75, 60, 50 };
1204	const u8 empty[3] = { 0, 0, 0 };
1205
1206	for (i = 0; i < 4; i++) {
1207		int uninitialized_var(width), height;
1208		cvt = &(timing->data.other_data.data.cvt[i]);
1209
1210		if (!memcmp(cvt->code, empty, 3))
1211			continue;
1212
1213		height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 4) + 1) * 2;
1214		switch (cvt->code[1] & 0x0c) {
1215		case 0x00:
1216			width = height * 4 / 3;
1217			break;
1218		case 0x04:
1219			width = height * 16 / 9;
1220			break;
1221		case 0x08:
1222			width = height * 16 / 10;
1223			break;
1224		case 0x0c:
1225			width = height * 15 / 9;
1226			break;
1227		}
1228
1229		for (j = 1; j < 5; j++) {
1230			if (cvt->code[2] & (1 << j)) {
1231				newmode = drm_cvt_mode(dev, width, height,
1232						       rates[j], j == 0,
1233						       false, false);
1234				if (newmode) {
1235					drm_mode_probed_add(connector, newmode);
1236					modes++;
1237				}
1238			}
1239		}
1240	}
1241
1242	return modes;
1243}
1244
1245static void
1246do_cvt_mode(struct detailed_timing *timing, void *c)
1247{
1248	struct detailed_mode_closure *closure = c;
1249	struct detailed_non_pixel *data = &timing->data.other_data;
1250
1251	if (data->type == EDID_DETAIL_CVT_3BYTE)
1252		closure->modes += drm_cvt_modes(closure->connector, timing);
1253}
1254
1255static int
1256add_cvt_modes(struct drm_connector *connector, struct edid *edid)
1257{	
1258	struct detailed_mode_closure closure = {
1259		connector, edid, 0, 0, 0
1260	};
1261
1262	if (version_greater(edid, 1, 2))
1263		drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
1264
1265	/* XXX should also look for CVT codes in VTB blocks */
1266
1267	return closure.modes;
1268}
1269
1270static void
1271do_detailed_mode(struct detailed_timing *timing, void *c)
1272{
1273	struct detailed_mode_closure *closure = c;
1274	struct drm_display_mode *newmode;
1275
1276	if (timing->pixel_clock) {
1277		newmode = drm_mode_detailed(closure->connector->dev,
1278					    closure->edid, timing,
1279					    closure->quirks);
1280		if (!newmode)
1281			return;
1282
1283		if (closure->preferred)
1284			newmode->type |= DRM_MODE_TYPE_PREFERRED;
1285
1286		drm_mode_probed_add(closure->connector, newmode);
1287		closure->modes++;
1288		closure->preferred = 0;
1289	}
1290}
1291
1292/*
1293 * add_detailed_modes - Add modes from detailed timings
1294 * @connector: attached connector
1295 * @edid: EDID block to scan
1296 * @quirks: quirks to apply
1297 */
1298static int
1299add_detailed_modes(struct drm_connector *connector, struct edid *edid,
1300		   u32 quirks)
1301{
1302	struct detailed_mode_closure closure = {
1303		connector,
1304		edid,
1305		1,
1306		quirks,
1307		0
1308	};
1309
1310	if (closure.preferred && !version_greater(edid, 1, 3))
1311		closure.preferred =
1312		    (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
1313
1314	drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
1315
1316	return closure.modes;
1317}
1318
1319#define HDMI_IDENTIFIER 0x000C03
1320#define AUDIO_BLOCK	0x01
 
1321#define VENDOR_BLOCK    0x03
 
 
1322#define EDID_BASIC_AUDIO	(1 << 6)
 
 
 
1323
1324/**
1325 * Search EDID for CEA extension block.
1326 */
1327u8 *drm_find_cea_extension(struct edid *edid)
1328{
1329	u8 *edid_ext = NULL;
1330	int i;
1331
1332	/* No EDID or EDID extensions */
1333	if (edid == NULL || edid->extensions == 0)
1334		return NULL;
1335
1336	/* Find CEA extension */
1337	for (i = 0; i < edid->extensions; i++) {
1338		edid_ext = (u8 *)edid + EDID_LENGTH * (i + 1);
1339		if (edid_ext[0] == CEA_EXT)
1340			break;
1341	}
1342
1343	if (i == edid->extensions)
1344		return NULL;
1345
1346	return edid_ext;
1347}
1348EXPORT_SYMBOL(drm_find_cea_extension);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1349
1350/**
1351 * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
1352 * @edid: monitor EDID information
1353 *
1354 * Parse the CEA extension according to CEA-861-B.
1355 * Return true if HDMI, false if not or unknown.
1356 */
1357bool drm_detect_hdmi_monitor(struct edid *edid)
1358{
1359	u8 *edid_ext;
1360	int i, hdmi_id;
1361	int start_offset, end_offset;
1362	bool is_hdmi = false;
1363
1364	edid_ext = drm_find_cea_extension(edid);
1365	if (!edid_ext)
1366		goto end;
1367
1368	/* Data block offset in CEA extension block */
1369	start_offset = 4;
1370	end_offset = edid_ext[2];
1371
1372	/*
1373	 * Because HDMI identifier is in Vendor Specific Block,
1374	 * search it from all data blocks of CEA extension.
1375	 */
1376	for (i = start_offset; i < end_offset;
1377		/* Increased by data block len */
1378		i += ((edid_ext[i] & 0x1f) + 1)) {
1379		/* Find vendor specific block */
1380		if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
1381			hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
1382				  edid_ext[i + 3] << 16;
1383			/* Find HDMI identifier */
1384			if (hdmi_id == HDMI_IDENTIFIER)
1385				is_hdmi = true;
1386			break;
1387		}
1388	}
1389
1390end:
1391	return is_hdmi;
1392}
1393EXPORT_SYMBOL(drm_detect_hdmi_monitor);
1394
1395/**
1396 * drm_detect_monitor_audio - check monitor audio capability
 
1397 *
1398 * Monitor should have CEA extension block.
1399 * If monitor has 'basic audio', but no CEA audio blocks, it's 'basic
1400 * audio' only. If there is any audio extension block and supported
1401 * audio format, assume at least 'basic audio' support, even if 'basic
1402 * audio' is not defined in EDID.
1403 *
1404 */
1405bool drm_detect_monitor_audio(struct edid *edid)
1406{
1407	u8 *edid_ext;
1408	int i, j;
1409	bool has_audio = false;
1410	int start_offset, end_offset;
1411
1412	edid_ext = drm_find_cea_extension(edid);
1413	if (!edid_ext)
1414		goto end;
1415
1416	has_audio = ((edid_ext[3] & EDID_BASIC_AUDIO) != 0);
1417
1418	if (has_audio) {
1419		DRM_DEBUG_KMS("Monitor has basic audio support\n");
1420		goto end;
1421	}
1422
1423	/* Data block offset in CEA extension block */
1424	start_offset = 4;
1425	end_offset = edid_ext[2];
1426
1427	for (i = start_offset; i < end_offset;
1428			i += ((edid_ext[i] & 0x1f) + 1)) {
1429		if ((edid_ext[i] >> 5) == AUDIO_BLOCK) {
1430			has_audio = true;
1431			for (j = 1; j < (edid_ext[i] & 0x1f); j += 3)
1432				DRM_DEBUG_KMS("CEA audio format %d\n",
1433					      (edid_ext[i + j] >> 3) & 0xf);
1434			goto end;
1435		}
1436	}
1437end:
1438	return has_audio;
1439}
1440EXPORT_SYMBOL(drm_detect_monitor_audio);
1441
1442/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1443 * drm_add_display_info - pull display info out if present
1444 * @edid: EDID data
1445 * @info: display info (attached to connector)
1446 *
1447 * Grab any available display info and stuff it into the drm_display_info
1448 * structure that's part of the connector.  Useful for tracking bpp and
1449 * color spaces.
1450 */
1451static void drm_add_display_info(struct edid *edid,
1452				 struct drm_display_info *info)
1453{
1454	u8 *edid_ext;
1455
1456	info->width_mm = edid->width_cm * 10;
1457	info->height_mm = edid->height_cm * 10;
1458
1459	/* driver figures it out in this case */
1460	info->bpc = 0;
1461	info->color_formats = 0;
1462
1463	/* Only defined for 1.4 with digital displays */
1464	if (edid->revision < 4)
1465		return;
1466
1467	if (!(edid->input & DRM_EDID_INPUT_DIGITAL))
1468		return;
1469
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1470	switch (edid->input & DRM_EDID_DIGITAL_DEPTH_MASK) {
1471	case DRM_EDID_DIGITAL_DEPTH_6:
1472		info->bpc = 6;
1473		break;
1474	case DRM_EDID_DIGITAL_DEPTH_8:
1475		info->bpc = 8;
1476		break;
1477	case DRM_EDID_DIGITAL_DEPTH_10:
1478		info->bpc = 10;
1479		break;
1480	case DRM_EDID_DIGITAL_DEPTH_12:
1481		info->bpc = 12;
1482		break;
1483	case DRM_EDID_DIGITAL_DEPTH_14:
1484		info->bpc = 14;
1485		break;
1486	case DRM_EDID_DIGITAL_DEPTH_16:
1487		info->bpc = 16;
1488		break;
1489	case DRM_EDID_DIGITAL_DEPTH_UNDEF:
1490	default:
1491		info->bpc = 0;
1492		break;
1493	}
1494
1495	info->color_formats = DRM_COLOR_FORMAT_RGB444;
1496	if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB444)
1497		info->color_formats = DRM_COLOR_FORMAT_YCRCB444;
1498	if (info->color_formats & DRM_EDID_FEATURE_RGB_YCRCB422)
1499		info->color_formats = DRM_COLOR_FORMAT_YCRCB422;
1500
1501	/* Get data from CEA blocks if present */
1502	edid_ext = drm_find_cea_extension(edid);
1503	if (!edid_ext)
1504		return;
1505
1506	info->cea_rev = edid_ext[1];
1507}
1508
1509/**
1510 * drm_add_edid_modes - add modes from EDID data, if available
1511 * @connector: connector we're probing
1512 * @edid: edid data
1513 *
1514 * Add the specified modes to the connector's mode list.
1515 *
1516 * Return number of modes added or 0 if we couldn't find any.
1517 */
1518int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
1519{
1520	int num_modes = 0;
1521	u32 quirks;
1522
1523	if (edid == NULL) {
1524		return 0;
1525	}
1526	if (!drm_edid_is_valid(edid)) {
1527		dev_warn(connector->dev->dev, "%s: EDID invalid.\n",
1528			 drm_get_connector_name(connector));
1529		return 0;
1530	}
1531
1532	quirks = edid_get_quirks(edid);
1533
1534	/*
1535	 * EDID spec says modes should be preferred in this order:
1536	 * - preferred detailed mode
1537	 * - other detailed modes from base block
1538	 * - detailed modes from extension blocks
1539	 * - CVT 3-byte code modes
1540	 * - standard timing codes
1541	 * - established timing codes
1542	 * - modes inferred from GTF or CVT range information
1543	 *
1544	 * We get this pretty much right.
1545	 *
1546	 * XXX order for additional mode types in extension blocks?
1547	 */
1548	num_modes += add_detailed_modes(connector, edid, quirks);
1549	num_modes += add_cvt_modes(connector, edid);
1550	num_modes += add_standard_modes(connector, edid);
1551	num_modes += add_established_modes(connector, edid);
1552	num_modes += add_inferred_modes(connector, edid);
 
 
 
1553
1554	if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
1555		edid_fixup_preferred(connector, quirks);
1556
1557	drm_add_display_info(edid, &connector->display_info);
1558
 
 
 
1559	return num_modes;
1560}
1561EXPORT_SYMBOL(drm_add_edid_modes);
1562
1563/**
1564 * drm_add_modes_noedid - add modes for the connectors without EDID
1565 * @connector: connector we're probing
1566 * @hdisplay: the horizontal display limit
1567 * @vdisplay: the vertical display limit
1568 *
1569 * Add the specified modes to the connector's mode list. Only when the
1570 * hdisplay/vdisplay is not beyond the given limit, it will be added.
1571 *
1572 * Return number of modes added or 0 if we couldn't find any.
1573 */
1574int drm_add_modes_noedid(struct drm_connector *connector,
1575			int hdisplay, int vdisplay)
1576{
1577	int i, count, num_modes = 0;
1578	struct drm_display_mode *mode;
1579	struct drm_device *dev = connector->dev;
1580
1581	count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
1582	if (hdisplay < 0)
1583		hdisplay = 0;
1584	if (vdisplay < 0)
1585		vdisplay = 0;
1586
1587	for (i = 0; i < count; i++) {
1588		const struct drm_display_mode *ptr = &drm_dmt_modes[i];
1589		if (hdisplay && vdisplay) {
1590			/*
1591			 * Only when two are valid, they will be used to check
1592			 * whether the mode should be added to the mode list of
1593			 * the connector.
1594			 */
1595			if (ptr->hdisplay > hdisplay ||
1596					ptr->vdisplay > vdisplay)
1597				continue;
1598		}
1599		if (drm_mode_vrefresh(ptr) > 61)
1600			continue;
1601		mode = drm_mode_duplicate(dev, ptr);
1602		if (mode) {
1603			drm_mode_probed_add(connector, mode);
1604			num_modes++;
1605		}
1606	}
1607	return num_modes;
1608}
1609EXPORT_SYMBOL(drm_add_modes_noedid);