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drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks
[~shefty/rdma-dev.git] / drivers / gpu / drm / i915 / intel_bios.c
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
37 static int panel_type;
38
39 static void *
40 find_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
65 static u16
66 get_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
75 static void
76 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
77                         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
118 /* Try to find integrated panel data */
119 static void
120 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
121                             struct bdb_header *bdb)
122 {
123         struct bdb_lvds_options *lvds_options;
124         struct bdb_lvds_lfp_data *lvds_lfp_data;
125         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
126         struct bdb_lvds_lfp_data_entry *entry;
127         struct lvds_dvo_timing *dvo_timing;
128         struct drm_display_mode *panel_fixed_mode;
129         int lfp_data_size, dvo_timing_offset;
130         int i, temp_downclock;
131         struct drm_display_mode *temp_mode;
132
133         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
134         if (!lvds_options)
135                 return;
136
137         dev_priv->lvds_dither = lvds_options->pixel_dither;
138         if (lvds_options->panel_type == 0xff)
139                 return;
140
141         panel_type = lvds_options->panel_type;
142
143         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
144         if (!lvds_lfp_data)
145                 return;
146
147         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
148         if (!lvds_lfp_data_ptrs)
149                 return;
150
151         dev_priv->lvds_vbt = 1;
152
153         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
154                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
155         entry = (struct bdb_lvds_lfp_data_entry *)
156                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
157                                                    lvds_options->panel_type));
158         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
159                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
160
161         /*
162          * the size of fp_timing varies on the different platform.
163          * So calculate the DVO timing relative offset in LVDS data
164          * entry to get the DVO timing entry
165          */
166         dvo_timing = (struct lvds_dvo_timing *)
167                         ((unsigned char *)entry + dvo_timing_offset);
168
169         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
170         if (!panel_fixed_mode)
171                 return;
172
173         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
174
175         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
176
177         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
178         drm_mode_debug_printmodeline(panel_fixed_mode);
179
180         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
181         temp_downclock = panel_fixed_mode->clock;
182         /*
183          * enumerate the LVDS panel timing info entry in VBT to check whether
184          * the LVDS downclock is found.
185          */
186         for (i = 0; i < 16; i++) {
187                 entry = (struct bdb_lvds_lfp_data_entry *)
188                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
189                 dvo_timing = (struct lvds_dvo_timing *)
190                         ((unsigned char *)entry + dvo_timing_offset);
191
192                 fill_detail_timing_data(temp_mode, dvo_timing);
193
194                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
195                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
196                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
197                 temp_mode->htotal == panel_fixed_mode->htotal &&
198                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
199                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
200                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
201                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
202                 temp_mode->clock < temp_downclock) {
203                         /*
204                          * downclock is already found. But we expect
205                          * to find the lower downclock.
206                          */
207                         temp_downclock = temp_mode->clock;
208                 }
209                 /* clear it to zero */
210                 memset(temp_mode, 0, sizeof(*temp_mode));
211         }
212         kfree(temp_mode);
213         if (temp_downclock < panel_fixed_mode->clock &&
214             i915_lvds_downclock) {
215                 dev_priv->lvds_downclock_avail = 1;
216                 dev_priv->lvds_downclock = temp_downclock;
217                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
218                                 "Normal Clock %dKHz, downclock %dKHz\n",
219                                 temp_downclock, panel_fixed_mode->clock);
220         }
221         return;
222 }
223
224 /* Try to find sdvo panel data */
225 static void
226 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
227                       struct bdb_header *bdb)
228 {
229         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
230         struct lvds_dvo_timing *dvo_timing;
231         struct drm_display_mode *panel_fixed_mode;
232
233         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
234         if (!sdvo_lvds_options)
235                 return;
236
237         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
238         if (!dvo_timing)
239                 return;
240
241         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
242
243         if (!panel_fixed_mode)
244                 return;
245
246         fill_detail_timing_data(panel_fixed_mode,
247                         dvo_timing + sdvo_lvds_options->panel_type);
248
249         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
250
251         return;
252 }
253
254 static void
255 parse_general_features(struct drm_i915_private *dev_priv,
256                        struct bdb_header *bdb)
257 {
258         struct drm_device *dev = dev_priv->dev;
259         struct bdb_general_features *general;
260
261         general = find_section(bdb, BDB_GENERAL_FEATURES);
262         if (general) {
263                 dev_priv->int_tv_support = general->int_tv_support;
264                 dev_priv->int_crt_support = general->int_crt_support;
265                 dev_priv->lvds_use_ssc = general->enable_ssc;
266
267                 if (dev_priv->lvds_use_ssc) {
268                         if (IS_I85X(dev))
269                                 dev_priv->lvds_ssc_freq =
270                                         general->ssc_freq ? 66 : 48;
271                         else if (IS_GEN5(dev) || IS_GEN6(dev))
272                                 dev_priv->lvds_ssc_freq =
273                                         general->ssc_freq ? 120 : 100;
274                         else
275                                 dev_priv->lvds_ssc_freq =
276                                         general->ssc_freq ? 100 : 96;
277                 }
278         }
279 }
280
281 static void
282 parse_general_definitions(struct drm_i915_private *dev_priv,
283                           struct bdb_header *bdb)
284 {
285         struct bdb_general_definitions *general;
286
287         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
288         if (general) {
289                 u16 block_size = get_blocksize(general);
290                 if (block_size >= sizeof(*general)) {
291                         int bus_pin = general->crt_ddc_gmbus_pin;
292                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
293                         if (bus_pin >= 1 && bus_pin <= 6)
294                                 dev_priv->crt_ddc_pin = bus_pin;
295                 } else {
296                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
297                                   block_size);
298                 }
299         }
300 }
301
302 static void
303 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
304                           struct bdb_header *bdb)
305 {
306         struct sdvo_device_mapping *p_mapping;
307         struct bdb_general_definitions *p_defs;
308         struct child_device_config *p_child;
309         int i, child_device_num, count;
310         u16     block_size;
311
312         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
313         if (!p_defs) {
314                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
315                 return;
316         }
317         /* judge whether the size of child device meets the requirements.
318          * If the child device size obtained from general definition block
319          * is different with sizeof(struct child_device_config), skip the
320          * parsing of sdvo device info
321          */
322         if (p_defs->child_dev_size != sizeof(*p_child)) {
323                 /* different child dev size . Ignore it */
324                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
325                 return;
326         }
327         /* get the block size of general definitions */
328         block_size = get_blocksize(p_defs);
329         /* get the number of child device */
330         child_device_num = (block_size - sizeof(*p_defs)) /
331                                 sizeof(*p_child);
332         count = 0;
333         for (i = 0; i < child_device_num; i++) {
334                 p_child = &(p_defs->devices[i]);
335                 if (!p_child->device_type) {
336                         /* skip the device block if device type is invalid */
337                         continue;
338                 }
339                 if (p_child->slave_addr != SLAVE_ADDR1 &&
340                         p_child->slave_addr != SLAVE_ADDR2) {
341                         /*
342                          * If the slave address is neither 0x70 nor 0x72,
343                          * it is not a SDVO device. Skip it.
344                          */
345                         continue;
346                 }
347                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
348                         p_child->dvo_port != DEVICE_PORT_DVOC) {
349                         /* skip the incorrect SDVO port */
350                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
351                         continue;
352                 }
353                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
354                                 " %s port\n",
355                                 p_child->slave_addr,
356                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
357                                         "SDVOB" : "SDVOC");
358                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
359                 if (!p_mapping->initialized) {
360                         p_mapping->dvo_port = p_child->dvo_port;
361                         p_mapping->slave_addr = p_child->slave_addr;
362                         p_mapping->dvo_wiring = p_child->dvo_wiring;
363                         p_mapping->ddc_pin = p_child->ddc_pin;
364                         p_mapping->i2c_pin = p_child->i2c_pin;
365                         p_mapping->i2c_speed = p_child->i2c_speed;
366                         p_mapping->initialized = 1;
367                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
368                                       p_mapping->dvo_port,
369                                       p_mapping->slave_addr,
370                                       p_mapping->dvo_wiring,
371                                       p_mapping->ddc_pin,
372                                       p_mapping->i2c_pin,
373                                       p_mapping->i2c_speed);
374                 } else {
375                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
376                                          "two SDVO device.\n");
377                 }
378                 if (p_child->slave2_addr) {
379                         /* Maybe this is a SDVO device with multiple inputs */
380                         /* And the mapping info is not added */
381                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
382                                 " is a SDVO device with multiple inputs.\n");
383                 }
384                 count++;
385         }
386
387         if (!count) {
388                 /* No SDVO device info is found */
389                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
390         }
391         return;
392 }
393
394 static void
395 parse_driver_features(struct drm_i915_private *dev_priv,
396                        struct bdb_header *bdb)
397 {
398         struct drm_device *dev = dev_priv->dev;
399         struct bdb_driver_features *driver;
400
401         driver = find_section(bdb, BDB_DRIVER_FEATURES);
402         if (!driver)
403                 return;
404
405         if (SUPPORTS_EDP(dev) &&
406             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
407                 dev_priv->edp.support = 1;
408
409         if (driver->dual_frequency)
410                 dev_priv->render_reclock_avail = true;
411 }
412
413 static void
414 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
415 {
416         struct bdb_edp *edp;
417         struct edp_power_seq *edp_pps;
418         struct edp_link_params *edp_link_params;
419
420         edp = find_section(bdb, BDB_EDP);
421         if (!edp) {
422                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
423                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
424                                       "supported, assume %dbpp panel color "
425                                       "depth.\n",
426                                       dev_priv->edp.bpp);
427                 }
428                 return;
429         }
430
431         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
432         case EDP_18BPP:
433                 dev_priv->edp.bpp = 18;
434                 break;
435         case EDP_24BPP:
436                 dev_priv->edp.bpp = 24;
437                 break;
438         case EDP_30BPP:
439                 dev_priv->edp.bpp = 30;
440                 break;
441         }
442
443         /* Get the eDP sequencing and link info */
444         edp_pps = &edp->power_seqs[panel_type];
445         edp_link_params = &edp->link_params[panel_type];
446
447         dev_priv->edp.pps = *edp_pps;
448
449         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
450                 DP_LINK_BW_1_62;
451         switch (edp_link_params->lanes) {
452         case 0:
453                 dev_priv->edp.lanes = 1;
454                 break;
455         case 1:
456                 dev_priv->edp.lanes = 2;
457                 break;
458         case 3:
459         default:
460                 dev_priv->edp.lanes = 4;
461                 break;
462         }
463         switch (edp_link_params->preemphasis) {
464         case 0:
465                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
466                 break;
467         case 1:
468                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
469                 break;
470         case 2:
471                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
472                 break;
473         case 3:
474                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
475                 break;
476         }
477         switch (edp_link_params->vswing) {
478         case 0:
479                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
480                 break;
481         case 1:
482                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
483                 break;
484         case 2:
485                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
486                 break;
487         case 3:
488                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
489                 break;
490         }
491 }
492
493 static void
494 parse_device_mapping(struct drm_i915_private *dev_priv,
495                        struct bdb_header *bdb)
496 {
497         struct bdb_general_definitions *p_defs;
498         struct child_device_config *p_child, *child_dev_ptr;
499         int i, child_device_num, count;
500         u16     block_size;
501
502         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
503         if (!p_defs) {
504                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
505                 return;
506         }
507         /* judge whether the size of child device meets the requirements.
508          * If the child device size obtained from general definition block
509          * is different with sizeof(struct child_device_config), skip the
510          * parsing of sdvo device info
511          */
512         if (p_defs->child_dev_size != sizeof(*p_child)) {
513                 /* different child dev size . Ignore it */
514                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
515                 return;
516         }
517         /* get the block size of general definitions */
518         block_size = get_blocksize(p_defs);
519         /* get the number of child device */
520         child_device_num = (block_size - sizeof(*p_defs)) /
521                                 sizeof(*p_child);
522         count = 0;
523         /* get the number of child device that is present */
524         for (i = 0; i < child_device_num; i++) {
525                 p_child = &(p_defs->devices[i]);
526                 if (!p_child->device_type) {
527                         /* skip the device block if device type is invalid */
528                         continue;
529                 }
530                 count++;
531         }
532         if (!count) {
533                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
534                 return;
535         }
536         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
537         if (!dev_priv->child_dev) {
538                 DRM_DEBUG_KMS("No memory space for child device\n");
539                 return;
540         }
541
542         dev_priv->child_dev_num = count;
543         count = 0;
544         for (i = 0; i < child_device_num; i++) {
545                 p_child = &(p_defs->devices[i]);
546                 if (!p_child->device_type) {
547                         /* skip the device block if device type is invalid */
548                         continue;
549                 }
550                 child_dev_ptr = dev_priv->child_dev + count;
551                 count++;
552                 memcpy((void *)child_dev_ptr, (void *)p_child,
553                                         sizeof(*p_child));
554         }
555         return;
556 }
557
558 static void
559 init_vbt_defaults(struct drm_i915_private *dev_priv)
560 {
561         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
562
563         /* LFP panel data */
564         dev_priv->lvds_dither = 1;
565         dev_priv->lvds_vbt = 0;
566
567         /* SDVO panel data */
568         dev_priv->sdvo_lvds_vbt_mode = NULL;
569
570         /* general features */
571         dev_priv->int_tv_support = 1;
572         dev_priv->int_crt_support = 1;
573         dev_priv->lvds_use_ssc = 0;
574
575         /* eDP data */
576         dev_priv->edp.bpp = 18;
577 }
578
579 /**
580  * intel_parse_bios - find VBT and initialize settings from the BIOS
581  * @dev: DRM device
582  *
583  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
584  * to appropriate values.
585  *
586  * Returns 0 on success, nonzero on failure.
587  */
588 bool
589 intel_parse_bios(struct drm_device *dev)
590 {
591         struct drm_i915_private *dev_priv = dev->dev_private;
592         struct pci_dev *pdev = dev->pdev;
593         struct bdb_header *bdb = NULL;
594         u8 __iomem *bios = NULL;
595
596         init_vbt_defaults(dev_priv);
597
598         /* XXX Should this validation be moved to intel_opregion.c? */
599         if (dev_priv->opregion.vbt) {
600                 struct vbt_header *vbt = dev_priv->opregion.vbt;
601                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
602                         DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
603                                          vbt->signature);
604                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
605                 } else
606                         dev_priv->opregion.vbt = NULL;
607         }
608
609         if (bdb == NULL) {
610                 struct vbt_header *vbt = NULL;
611                 size_t size;
612                 int i;
613
614                 bios = pci_map_rom(pdev, &size);
615                 if (!bios)
616                         return -1;
617
618                 /* Scour memory looking for the VBT signature */
619                 for (i = 0; i + 4 < size; i++) {
620                         if (!memcmp(bios + i, "$VBT", 4)) {
621                                 vbt = (struct vbt_header *)(bios + i);
622                                 break;
623                         }
624                 }
625
626                 if (!vbt) {
627                         DRM_ERROR("VBT signature missing\n");
628                         pci_unmap_rom(pdev, bios);
629                         return -1;
630                 }
631
632                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
633         }
634
635         /* Grab useful general definitions */
636         parse_general_features(dev_priv, bdb);
637         parse_general_definitions(dev_priv, bdb);
638         parse_lfp_panel_data(dev_priv, bdb);
639         parse_sdvo_panel_data(dev_priv, bdb);
640         parse_sdvo_device_mapping(dev_priv, bdb);
641         parse_device_mapping(dev_priv, bdb);
642         parse_driver_features(dev_priv, bdb);
643         parse_edp(dev_priv, bdb);
644
645         if (bios)
646                 pci_unmap_rom(pdev, bios);
647
648         return 0;
649 }
650
651 /* Ensure that vital registers have been initialised, even if the BIOS
652  * is absent or just failing to do its job.
653  */
654 void intel_setup_bios(struct drm_device *dev)
655 {
656         struct drm_i915_private *dev_priv = dev->dev_private;
657
658          /* Set the Panel Power On/Off timings if uninitialized. */
659         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
660                 /* Set T2 to 40ms and T5 to 200ms */
661                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
662
663                 /* Set T3 to 35ms and Tx to 200ms */
664                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
665         }
666 }