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1/*
2 * Copyright © 2006 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27#include <drm/drm_dp_helper.h>
28#include "drmP.h"
29#include "drm.h"
30#include "i915_drm.h"
31#include "i915_drv.h"
32#include "intel_bios.h"
33
34#define SLAVE_ADDR1 0x70
35#define SLAVE_ADDR2 0x72
36
37static int panel_type;
38
39static void *
40find_section(struct bdb_header *bdb, int section_id)
41{
42 u8 *base = (u8 *)bdb;
43 int index = 0;
44 u16 total, current_size;
45 u8 current_id;
46
47 /* skip to first section */
48 index += bdb->header_size;
49 total = bdb->bdb_size;
50
51 /* walk the sections looking for section_id */
52 while (index < total) {
53 current_id = *(base + index);
54 index++;
55 current_size = *((u16 *)(base + index));
56 index += 2;
57 if (current_id == section_id)
58 return base + index;
59 index += current_size;
60 }
61
62 return NULL;
63}
64
65static u16
66get_blocksize(void *p)
67{
68 u16 *block_ptr, block_size;
69
70 block_ptr = (u16 *)((char *)p - 2);
71 block_size = *block_ptr;
72 return block_size;
73}
74
75static void
76fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
77 const struct lvds_dvo_timing *dvo_timing)
78{
79 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
80 dvo_timing->hactive_lo;
81 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
82 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
83 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
84 dvo_timing->hsync_pulse_width;
85 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
86 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
87
88 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
89 dvo_timing->vactive_lo;
90 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
91 dvo_timing->vsync_off;
92 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
93 dvo_timing->vsync_pulse_width;
94 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
95 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
96 panel_fixed_mode->clock = dvo_timing->clock * 10;
97 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
98
99 if (dvo_timing->hsync_positive)
100 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
101 else
102 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
103
104 if (dvo_timing->vsync_positive)
105 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
106 else
107 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
108
109 /* Some VBTs have bogus h/vtotal values */
110 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
111 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
112 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
113 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
114
115 drm_mode_set_name(panel_fixed_mode);
116}
117
118static bool
119lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
120 const struct lvds_dvo_timing *b)
121{
122 if (a->hactive_hi != b->hactive_hi ||
123 a->hactive_lo != b->hactive_lo)
124 return false;
125
126 if (a->hsync_off_hi != b->hsync_off_hi ||
127 a->hsync_off_lo != b->hsync_off_lo)
128 return false;
129
130 if (a->hsync_pulse_width != b->hsync_pulse_width)
131 return false;
132
133 if (a->hblank_hi != b->hblank_hi ||
134 a->hblank_lo != b->hblank_lo)
135 return false;
136
137 if (a->vactive_hi != b->vactive_hi ||
138 a->vactive_lo != b->vactive_lo)
139 return false;
140
141 if (a->vsync_off != b->vsync_off)
142 return false;
143
144 if (a->vsync_pulse_width != b->vsync_pulse_width)
145 return false;
146
147 if (a->vblank_hi != b->vblank_hi ||
148 a->vblank_lo != b->vblank_lo)
149 return false;
150
151 return true;
152}
153
154static const struct lvds_dvo_timing *
155get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
156 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
157 int index)
158{
159 /*
160 * the size of fp_timing varies on the different platform.
161 * So calculate the DVO timing relative offset in LVDS data
162 * entry to get the DVO timing entry
163 */
164
165 int lfp_data_size =
166 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
167 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
168 int dvo_timing_offset =
169 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
170 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
171 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
172
173 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
174}
175
176/* Try to find integrated panel data */
177static void
178parse_lfp_panel_data(struct drm_i915_private *dev_priv,
179 struct bdb_header *bdb)
180{
181 const struct bdb_lvds_options *lvds_options;
182 const struct bdb_lvds_lfp_data *lvds_lfp_data;
183 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
184 const struct lvds_dvo_timing *panel_dvo_timing;
185 struct drm_display_mode *panel_fixed_mode;
186 int i, downclock;
187
188 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
189 if (!lvds_options)
190 return;
191
192 dev_priv->lvds_dither = lvds_options->pixel_dither;
193 if (lvds_options->panel_type == 0xff)
194 return;
195
196 panel_type = lvds_options->panel_type;
197
198 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
199 if (!lvds_lfp_data)
200 return;
201
202 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
203 if (!lvds_lfp_data_ptrs)
204 return;
205
206 dev_priv->lvds_vbt = 1;
207
208 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
209 lvds_lfp_data_ptrs,
210 lvds_options->panel_type);
211
212 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
213 if (!panel_fixed_mode)
214 return;
215
216 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
217
218 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
219
220 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
221 drm_mode_debug_printmodeline(panel_fixed_mode);
222
223 /*
224 * Iterate over the LVDS panel timing info to find the lowest clock
225 * for the native resolution.
226 */
227 downclock = panel_dvo_timing->clock;
228 for (i = 0; i < 16; i++) {
229 const struct lvds_dvo_timing *dvo_timing;
230
231 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
232 lvds_lfp_data_ptrs,
233 i);
234 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
235 dvo_timing->clock < downclock)
236 downclock = dvo_timing->clock;
237 }
238
239 if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
240 dev_priv->lvds_downclock_avail = 1;
241 dev_priv->lvds_downclock = downclock * 10;
242 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
243 "Normal Clock %dKHz, downclock %dKHz\n",
244 panel_fixed_mode->clock, 10*downclock);
245 }
246}
247
248/* Try to find sdvo panel data */
249static void
250parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
251 struct bdb_header *bdb)
252{
253 struct lvds_dvo_timing *dvo_timing;
254 struct drm_display_mode *panel_fixed_mode;
255 int index;
256
257 index = i915_vbt_sdvo_panel_type;
258 if (index == -1) {
259 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
260
261 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
262 if (!sdvo_lvds_options)
263 return;
264
265 index = sdvo_lvds_options->panel_type;
266 }
267
268 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
269 if (!dvo_timing)
270 return;
271
272 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
273 if (!panel_fixed_mode)
274 return;
275
276 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
277
278 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
279
280 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
281 drm_mode_debug_printmodeline(panel_fixed_mode);
282}
283
284static int intel_bios_ssc_frequency(struct drm_device *dev,
285 bool alternate)
286{
287 switch (INTEL_INFO(dev)->gen) {
288 case 2:
289 return alternate ? 66 : 48;
290 case 3:
291 case 4:
292 return alternate ? 100 : 96;
293 default:
294 return alternate ? 100 : 120;
295 }
296}
297
298static void
299parse_general_features(struct drm_i915_private *dev_priv,
300 struct bdb_header *bdb)
301{
302 struct drm_device *dev = dev_priv->dev;
303 struct bdb_general_features *general;
304
305 general = find_section(bdb, BDB_GENERAL_FEATURES);
306 if (general) {
307 dev_priv->int_tv_support = general->int_tv_support;
308 dev_priv->int_crt_support = general->int_crt_support;
309 dev_priv->lvds_use_ssc = general->enable_ssc;
310 dev_priv->lvds_ssc_freq =
311 intel_bios_ssc_frequency(dev, general->ssc_freq);
312 }
313}
314
315static void
316parse_general_definitions(struct drm_i915_private *dev_priv,
317 struct bdb_header *bdb)
318{
319 struct bdb_general_definitions *general;
320
321 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
322 if (general) {
323 u16 block_size = get_blocksize(general);
324 if (block_size >= sizeof(*general)) {
325 int bus_pin = general->crt_ddc_gmbus_pin;
326 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
327 if (bus_pin >= 1 && bus_pin <= 6)
328 dev_priv->crt_ddc_pin = bus_pin;
329 } else {
330 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
331 block_size);
332 }
333 }
334}
335
336static void
337parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
338 struct bdb_header *bdb)
339{
340 struct sdvo_device_mapping *p_mapping;
341 struct bdb_general_definitions *p_defs;
342 struct child_device_config *p_child;
343 int i, child_device_num, count;
344 u16 block_size;
345
346 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
347 if (!p_defs) {
348 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
349 return;
350 }
351 /* judge whether the size of child device meets the requirements.
352 * If the child device size obtained from general definition block
353 * is different with sizeof(struct child_device_config), skip the
354 * parsing of sdvo device info
355 */
356 if (p_defs->child_dev_size != sizeof(*p_child)) {
357 /* different child dev size . Ignore it */
358 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
359 return;
360 }
361 /* get the block size of general definitions */
362 block_size = get_blocksize(p_defs);
363 /* get the number of child device */
364 child_device_num = (block_size - sizeof(*p_defs)) /
365 sizeof(*p_child);
366 count = 0;
367 for (i = 0; i < child_device_num; i++) {
368 p_child = &(p_defs->devices[i]);
369 if (!p_child->device_type) {
370 /* skip the device block if device type is invalid */
371 continue;
372 }
373 if (p_child->slave_addr != SLAVE_ADDR1 &&
374 p_child->slave_addr != SLAVE_ADDR2) {
375 /*
376 * If the slave address is neither 0x70 nor 0x72,
377 * it is not a SDVO device. Skip it.
378 */
379 continue;
380 }
381 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
382 p_child->dvo_port != DEVICE_PORT_DVOC) {
383 /* skip the incorrect SDVO port */
384 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
385 continue;
386 }
387 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
388 " %s port\n",
389 p_child->slave_addr,
390 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
391 "SDVOB" : "SDVOC");
392 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
393 if (!p_mapping->initialized) {
394 p_mapping->dvo_port = p_child->dvo_port;
395 p_mapping->slave_addr = p_child->slave_addr;
396 p_mapping->dvo_wiring = p_child->dvo_wiring;
397 p_mapping->ddc_pin = p_child->ddc_pin;
398 p_mapping->i2c_pin = p_child->i2c_pin;
399 p_mapping->i2c_speed = p_child->i2c_speed;
400 p_mapping->initialized = 1;
401 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
402 p_mapping->dvo_port,
403 p_mapping->slave_addr,
404 p_mapping->dvo_wiring,
405 p_mapping->ddc_pin,
406 p_mapping->i2c_pin,
407 p_mapping->i2c_speed);
408 } else {
409 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
410 "two SDVO device.\n");
411 }
412 if (p_child->slave2_addr) {
413 /* Maybe this is a SDVO device with multiple inputs */
414 /* And the mapping info is not added */
415 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
416 " is a SDVO device with multiple inputs.\n");
417 }
418 count++;
419 }
420
421 if (!count) {
422 /* No SDVO device info is found */
423 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
424 }
425 return;
426}
427
428static void
429parse_driver_features(struct drm_i915_private *dev_priv,
430 struct bdb_header *bdb)
431{
432 struct drm_device *dev = dev_priv->dev;
433 struct bdb_driver_features *driver;
434
435 driver = find_section(bdb, BDB_DRIVER_FEATURES);
436 if (!driver)
437 return;
438
439 if (SUPPORTS_EDP(dev) &&
440 driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
441 dev_priv->edp.support = 1;
442
443 if (driver->dual_frequency)
444 dev_priv->render_reclock_avail = true;
445}
446
447static void
448parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
449{
450 struct bdb_edp *edp;
451 struct edp_power_seq *edp_pps;
452 struct edp_link_params *edp_link_params;
453
454 edp = find_section(bdb, BDB_EDP);
455 if (!edp) {
456 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
457 DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
458 "supported, assume %dbpp panel color "
459 "depth.\n",
460 dev_priv->edp.bpp);
461 }
462 return;
463 }
464
465 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
466 case EDP_18BPP:
467 dev_priv->edp.bpp = 18;
468 break;
469 case EDP_24BPP:
470 dev_priv->edp.bpp = 24;
471 break;
472 case EDP_30BPP:
473 dev_priv->edp.bpp = 30;
474 break;
475 }
476
477 /* Get the eDP sequencing and link info */
478 edp_pps = &edp->power_seqs[panel_type];
479 edp_link_params = &edp->link_params[panel_type];
480
481 dev_priv->edp.pps = *edp_pps;
482
483 dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
484 DP_LINK_BW_1_62;
485 switch (edp_link_params->lanes) {
486 case 0:
487 dev_priv->edp.lanes = 1;
488 break;
489 case 1:
490 dev_priv->edp.lanes = 2;
491 break;
492 case 3:
493 default:
494 dev_priv->edp.lanes = 4;
495 break;
496 }
497 switch (edp_link_params->preemphasis) {
498 case 0:
499 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
500 break;
501 case 1:
502 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
503 break;
504 case 2:
505 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
506 break;
507 case 3:
508 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
509 break;
510 }
511 switch (edp_link_params->vswing) {
512 case 0:
513 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
514 break;
515 case 1:
516 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
517 break;
518 case 2:
519 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
520 break;
521 case 3:
522 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
523 break;
524 }
525}
526
527static void
528parse_device_mapping(struct drm_i915_private *dev_priv,
529 struct bdb_header *bdb)
530{
531 struct bdb_general_definitions *p_defs;
532 struct child_device_config *p_child, *child_dev_ptr;
533 int i, child_device_num, count;
534 u16 block_size;
535
536 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
537 if (!p_defs) {
538 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
539 return;
540 }
541 /* judge whether the size of child device meets the requirements.
542 * If the child device size obtained from general definition block
543 * is different with sizeof(struct child_device_config), skip the
544 * parsing of sdvo device info
545 */
546 if (p_defs->child_dev_size != sizeof(*p_child)) {
547 /* different child dev size . Ignore it */
548 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
549 return;
550 }
551 /* get the block size of general definitions */
552 block_size = get_blocksize(p_defs);
553 /* get the number of child device */
554 child_device_num = (block_size - sizeof(*p_defs)) /
555 sizeof(*p_child);
556 count = 0;
557 /* get the number of child device that is present */
558 for (i = 0; i < child_device_num; i++) {
559 p_child = &(p_defs->devices[i]);
560 if (!p_child->device_type) {
561 /* skip the device block if device type is invalid */
562 continue;
563 }
564 count++;
565 }
566 if (!count) {
567 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
568 return;
569 }
570 dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
571 if (!dev_priv->child_dev) {
572 DRM_DEBUG_KMS("No memory space for child device\n");
573 return;
574 }
575
576 dev_priv->child_dev_num = count;
577 count = 0;
578 for (i = 0; i < child_device_num; i++) {
579 p_child = &(p_defs->devices[i]);
580 if (!p_child->device_type) {
581 /* skip the device block if device type is invalid */
582 continue;
583 }
584 child_dev_ptr = dev_priv->child_dev + count;
585 count++;
586 memcpy((void *)child_dev_ptr, (void *)p_child,
587 sizeof(*p_child));
588 }
589 return;
590}
591
592static void
593init_vbt_defaults(struct drm_i915_private *dev_priv)
594{
595 struct drm_device *dev = dev_priv->dev;
596
597 dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
598
599 /* LFP panel data */
600 dev_priv->lvds_dither = 1;
601 dev_priv->lvds_vbt = 0;
602
603 /* SDVO panel data */
604 dev_priv->sdvo_lvds_vbt_mode = NULL;
605
606 /* general features */
607 dev_priv->int_tv_support = 1;
608 dev_priv->int_crt_support = 1;
609
610 /* Default to using SSC */
611 dev_priv->lvds_use_ssc = 1;
612 dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
613 DRM_DEBUG("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
614
615 /* eDP data */
616 dev_priv->edp.bpp = 18;
617}
618
619/**
620 * intel_parse_bios - find VBT and initialize settings from the BIOS
621 * @dev: DRM device
622 *
623 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
624 * to appropriate values.
625 *
626 * Returns 0 on success, nonzero on failure.
627 */
628bool
629intel_parse_bios(struct drm_device *dev)
630{
631 struct drm_i915_private *dev_priv = dev->dev_private;
632 struct pci_dev *pdev = dev->pdev;
633 struct bdb_header *bdb = NULL;
634 u8 __iomem *bios = NULL;
635
636 init_vbt_defaults(dev_priv);
637
638 /* XXX Should this validation be moved to intel_opregion.c? */
639 if (dev_priv->opregion.vbt) {
640 struct vbt_header *vbt = dev_priv->opregion.vbt;
641 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
642 DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
643 vbt->signature);
644 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
645 } else
646 dev_priv->opregion.vbt = NULL;
647 }
648
649 if (bdb == NULL) {
650 struct vbt_header *vbt = NULL;
651 size_t size;
652 int i;
653
654 bios = pci_map_rom(pdev, &size);
655 if (!bios)
656 return -1;
657
658 /* Scour memory looking for the VBT signature */
659 for (i = 0; i + 4 < size; i++) {
660 if (!memcmp(bios + i, "$VBT", 4)) {
661 vbt = (struct vbt_header *)(bios + i);
662 break;
663 }
664 }
665
666 if (!vbt) {
667 DRM_ERROR("VBT signature missing\n");
668 pci_unmap_rom(pdev, bios);
669 return -1;
670 }
671
672 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
673 }
674
675 /* Grab useful general definitions */
676 parse_general_features(dev_priv, bdb);
677 parse_general_definitions(dev_priv, bdb);
678 parse_lfp_panel_data(dev_priv, bdb);
679 parse_sdvo_panel_data(dev_priv, bdb);
680 parse_sdvo_device_mapping(dev_priv, bdb);
681 parse_device_mapping(dev_priv, bdb);
682 parse_driver_features(dev_priv, bdb);
683 parse_edp(dev_priv, bdb);
684
685 if (bios)
686 pci_unmap_rom(pdev, bios);
687
688 return 0;
689}
690
691/* Ensure that vital registers have been initialised, even if the BIOS
692 * is absent or just failing to do its job.
693 */
694void intel_setup_bios(struct drm_device *dev)
695{
696 struct drm_i915_private *dev_priv = dev->dev_private;
697
698 /* Set the Panel Power On/Off timings if uninitialized. */
699 if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
700 /* Set T2 to 40ms and T5 to 200ms */
701 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
702
703 /* Set T3 to 35ms and Tx to 200ms */
704 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
705 }
706}