Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / gpu / drm / i915 / intel_bios.c
blob22efb084c4218d62f21eae593def01973bbb1f42
1 /*
2 * Copyright © 2006 Intel Corporation
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:
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.
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.
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
27 #include <linux/dmi.h>
28 #include <drm/drm_dp_helper.h>
29 #include "drmP.h"
30 #include "drm.h"
31 #include "i915_drm.h"
32 #include "i915_drv.h"
33 #include "intel_bios.h"
35 #define SLAVE_ADDR1 0x70
36 #define SLAVE_ADDR2 0x72
38 static int panel_type;
40 static void *
41 find_section(struct bdb_header *bdb, int section_id)
43 u8 *base = (u8 *)bdb;
44 int index = 0;
45 u16 total, current_size;
46 u8 current_id;
48 /* skip to first section */
49 index += bdb->header_size;
50 total = bdb->bdb_size;
52 /* walk the sections looking for section_id */
53 while (index < total) {
54 current_id = *(base + index);
55 index++;
56 current_size = *((u16 *)(base + index));
57 index += 2;
58 if (current_id == section_id)
59 return base + index;
60 index += current_size;
63 return NULL;
66 static u16
67 get_blocksize(void *p)
69 u16 *block_ptr, block_size;
71 block_ptr = (u16 *)((char *)p - 2);
72 block_size = *block_ptr;
73 return block_size;
76 static void
77 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
78 const struct lvds_dvo_timing *dvo_timing)
80 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
81 dvo_timing->hactive_lo;
82 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
83 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
84 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
85 dvo_timing->hsync_pulse_width;
86 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
87 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
89 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
90 dvo_timing->vactive_lo;
91 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
92 dvo_timing->vsync_off;
93 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
94 dvo_timing->vsync_pulse_width;
95 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
96 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
97 panel_fixed_mode->clock = dvo_timing->clock * 10;
98 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
100 if (dvo_timing->hsync_positive)
101 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
102 else
103 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
105 if (dvo_timing->vsync_positive)
106 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
107 else
108 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
110 /* Some VBTs have bogus h/vtotal values */
111 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
112 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
113 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
114 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
116 drm_mode_set_name(panel_fixed_mode);
119 static bool
120 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
121 const struct lvds_dvo_timing *b)
123 if (a->hactive_hi != b->hactive_hi ||
124 a->hactive_lo != b->hactive_lo)
125 return false;
127 if (a->hsync_off_hi != b->hsync_off_hi ||
128 a->hsync_off_lo != b->hsync_off_lo)
129 return false;
131 if (a->hsync_pulse_width != b->hsync_pulse_width)
132 return false;
134 if (a->hblank_hi != b->hblank_hi ||
135 a->hblank_lo != b->hblank_lo)
136 return false;
138 if (a->vactive_hi != b->vactive_hi ||
139 a->vactive_lo != b->vactive_lo)
140 return false;
142 if (a->vsync_off != b->vsync_off)
143 return false;
145 if (a->vsync_pulse_width != b->vsync_pulse_width)
146 return false;
148 if (a->vblank_hi != b->vblank_hi ||
149 a->vblank_lo != b->vblank_lo)
150 return false;
152 return true;
155 static const struct lvds_dvo_timing *
156 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
157 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
158 int index)
161 * the size of fp_timing varies on the different platform.
162 * So calculate the DVO timing relative offset in LVDS data
163 * entry to get the DVO timing entry
166 int lfp_data_size =
167 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
168 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
169 int dvo_timing_offset =
170 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
171 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
172 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
174 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
177 /* Try to find integrated panel data */
178 static void
179 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
180 struct bdb_header *bdb)
182 const struct bdb_lvds_options *lvds_options;
183 const struct bdb_lvds_lfp_data *lvds_lfp_data;
184 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
185 const struct lvds_dvo_timing *panel_dvo_timing;
186 struct drm_display_mode *panel_fixed_mode;
187 int i, downclock;
189 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
190 if (!lvds_options)
191 return;
193 dev_priv->lvds_dither = lvds_options->pixel_dither;
194 if (lvds_options->panel_type == 0xff)
195 return;
197 panel_type = lvds_options->panel_type;
199 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
200 if (!lvds_lfp_data)
201 return;
203 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
204 if (!lvds_lfp_data_ptrs)
205 return;
207 dev_priv->lvds_vbt = 1;
209 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
210 lvds_lfp_data_ptrs,
211 lvds_options->panel_type);
213 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
214 if (!panel_fixed_mode)
215 return;
217 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
219 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
221 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
222 drm_mode_debug_printmodeline(panel_fixed_mode);
225 * Iterate over the LVDS panel timing info to find the lowest clock
226 * for the native resolution.
228 downclock = panel_dvo_timing->clock;
229 for (i = 0; i < 16; i++) {
230 const struct lvds_dvo_timing *dvo_timing;
232 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
233 lvds_lfp_data_ptrs,
235 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
236 dvo_timing->clock < downclock)
237 downclock = dvo_timing->clock;
240 if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
241 dev_priv->lvds_downclock_avail = 1;
242 dev_priv->lvds_downclock = downclock * 10;
243 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
244 "Normal Clock %dKHz, downclock %dKHz\n",
245 panel_fixed_mode->clock, 10*downclock);
249 /* Try to find sdvo panel data */
250 static void
251 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
252 struct bdb_header *bdb)
254 struct lvds_dvo_timing *dvo_timing;
255 struct drm_display_mode *panel_fixed_mode;
256 int index;
258 index = i915_vbt_sdvo_panel_type;
259 if (index == -1) {
260 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
262 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
263 if (!sdvo_lvds_options)
264 return;
266 index = sdvo_lvds_options->panel_type;
269 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
270 if (!dvo_timing)
271 return;
273 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
274 if (!panel_fixed_mode)
275 return;
277 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
279 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
281 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
282 drm_mode_debug_printmodeline(panel_fixed_mode);
285 static int intel_bios_ssc_frequency(struct drm_device *dev,
286 bool alternate)
288 switch (INTEL_INFO(dev)->gen) {
289 case 2:
290 return alternate ? 66 : 48;
291 case 3:
292 case 4:
293 return alternate ? 100 : 96;
294 default:
295 return alternate ? 100 : 120;
299 static void
300 parse_general_features(struct drm_i915_private *dev_priv,
301 struct bdb_header *bdb)
303 struct drm_device *dev = dev_priv->dev;
304 struct bdb_general_features *general;
306 general = find_section(bdb, BDB_GENERAL_FEATURES);
307 if (general) {
308 dev_priv->int_tv_support = general->int_tv_support;
309 dev_priv->int_crt_support = general->int_crt_support;
310 dev_priv->lvds_use_ssc = general->enable_ssc;
311 dev_priv->lvds_ssc_freq =
312 intel_bios_ssc_frequency(dev, general->ssc_freq);
313 dev_priv->display_clock_mode = general->display_clock_mode;
314 DRM_DEBUG_KMS("BDB_GENERAL_FEATURES int_tv_support %d int_crt_support %d lvds_use_ssc %d lvds_ssc_freq %d display_clock_mode %d\n",
315 dev_priv->int_tv_support,
316 dev_priv->int_crt_support,
317 dev_priv->lvds_use_ssc,
318 dev_priv->lvds_ssc_freq,
319 dev_priv->display_clock_mode);
323 static void
324 parse_general_definitions(struct drm_i915_private *dev_priv,
325 struct bdb_header *bdb)
327 struct bdb_general_definitions *general;
329 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
330 if (general) {
331 u16 block_size = get_blocksize(general);
332 if (block_size >= sizeof(*general)) {
333 int bus_pin = general->crt_ddc_gmbus_pin;
334 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
335 if (bus_pin >= 1 && bus_pin <= 6)
336 dev_priv->crt_ddc_pin = bus_pin;
337 } else {
338 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
339 block_size);
344 static void
345 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
346 struct bdb_header *bdb)
348 struct sdvo_device_mapping *p_mapping;
349 struct bdb_general_definitions *p_defs;
350 struct child_device_config *p_child;
351 int i, child_device_num, count;
352 u16 block_size;
354 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
355 if (!p_defs) {
356 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
357 return;
359 /* judge whether the size of child device meets the requirements.
360 * If the child device size obtained from general definition block
361 * is different with sizeof(struct child_device_config), skip the
362 * parsing of sdvo device info
364 if (p_defs->child_dev_size != sizeof(*p_child)) {
365 /* different child dev size . Ignore it */
366 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
367 return;
369 /* get the block size of general definitions */
370 block_size = get_blocksize(p_defs);
371 /* get the number of child device */
372 child_device_num = (block_size - sizeof(*p_defs)) /
373 sizeof(*p_child);
374 count = 0;
375 for (i = 0; i < child_device_num; i++) {
376 p_child = &(p_defs->devices[i]);
377 if (!p_child->device_type) {
378 /* skip the device block if device type is invalid */
379 continue;
381 if (p_child->slave_addr != SLAVE_ADDR1 &&
382 p_child->slave_addr != SLAVE_ADDR2) {
384 * If the slave address is neither 0x70 nor 0x72,
385 * it is not a SDVO device. Skip it.
387 continue;
389 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
390 p_child->dvo_port != DEVICE_PORT_DVOC) {
391 /* skip the incorrect SDVO port */
392 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
393 continue;
395 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
396 " %s port\n",
397 p_child->slave_addr,
398 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
399 "SDVOB" : "SDVOC");
400 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
401 if (!p_mapping->initialized) {
402 p_mapping->dvo_port = p_child->dvo_port;
403 p_mapping->slave_addr = p_child->slave_addr;
404 p_mapping->dvo_wiring = p_child->dvo_wiring;
405 p_mapping->ddc_pin = p_child->ddc_pin;
406 p_mapping->i2c_pin = p_child->i2c_pin;
407 p_mapping->initialized = 1;
408 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
409 p_mapping->dvo_port,
410 p_mapping->slave_addr,
411 p_mapping->dvo_wiring,
412 p_mapping->ddc_pin,
413 p_mapping->i2c_pin);
414 } else {
415 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
416 "two SDVO device.\n");
418 if (p_child->slave2_addr) {
419 /* Maybe this is a SDVO device with multiple inputs */
420 /* And the mapping info is not added */
421 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
422 " is a SDVO device with multiple inputs.\n");
424 count++;
427 if (!count) {
428 /* No SDVO device info is found */
429 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
431 return;
434 static void
435 parse_driver_features(struct drm_i915_private *dev_priv,
436 struct bdb_header *bdb)
438 struct drm_device *dev = dev_priv->dev;
439 struct bdb_driver_features *driver;
441 driver = find_section(bdb, BDB_DRIVER_FEATURES);
442 if (!driver)
443 return;
445 if (SUPPORTS_EDP(dev) &&
446 driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
447 dev_priv->edp.support = 1;
449 if (driver->dual_frequency)
450 dev_priv->render_reclock_avail = true;
453 static void
454 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
456 struct bdb_edp *edp;
457 struct edp_power_seq *edp_pps;
458 struct edp_link_params *edp_link_params;
460 edp = find_section(bdb, BDB_EDP);
461 if (!edp) {
462 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
463 DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
464 "supported, assume %dbpp panel color "
465 "depth.\n",
466 dev_priv->edp.bpp);
468 return;
471 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
472 case EDP_18BPP:
473 dev_priv->edp.bpp = 18;
474 break;
475 case EDP_24BPP:
476 dev_priv->edp.bpp = 24;
477 break;
478 case EDP_30BPP:
479 dev_priv->edp.bpp = 30;
480 break;
483 /* Get the eDP sequencing and link info */
484 edp_pps = &edp->power_seqs[panel_type];
485 edp_link_params = &edp->link_params[panel_type];
487 dev_priv->edp.pps = *edp_pps;
489 dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
490 DP_LINK_BW_1_62;
491 switch (edp_link_params->lanes) {
492 case 0:
493 dev_priv->edp.lanes = 1;
494 break;
495 case 1:
496 dev_priv->edp.lanes = 2;
497 break;
498 case 3:
499 default:
500 dev_priv->edp.lanes = 4;
501 break;
503 switch (edp_link_params->preemphasis) {
504 case 0:
505 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
506 break;
507 case 1:
508 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
509 break;
510 case 2:
511 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
512 break;
513 case 3:
514 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
515 break;
517 switch (edp_link_params->vswing) {
518 case 0:
519 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
520 break;
521 case 1:
522 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
523 break;
524 case 2:
525 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
526 break;
527 case 3:
528 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
529 break;
533 static void
534 parse_device_mapping(struct drm_i915_private *dev_priv,
535 struct bdb_header *bdb)
537 struct bdb_general_definitions *p_defs;
538 struct child_device_config *p_child, *child_dev_ptr;
539 int i, child_device_num, count;
540 u16 block_size;
542 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
543 if (!p_defs) {
544 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
545 return;
547 /* judge whether the size of child device meets the requirements.
548 * If the child device size obtained from general definition block
549 * is different with sizeof(struct child_device_config), skip the
550 * parsing of sdvo device info
552 if (p_defs->child_dev_size != sizeof(*p_child)) {
553 /* different child dev size . Ignore it */
554 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
555 return;
557 /* get the block size of general definitions */
558 block_size = get_blocksize(p_defs);
559 /* get the number of child device */
560 child_device_num = (block_size - sizeof(*p_defs)) /
561 sizeof(*p_child);
562 count = 0;
563 /* get the number of child device that is present */
564 for (i = 0; i < child_device_num; i++) {
565 p_child = &(p_defs->devices[i]);
566 if (!p_child->device_type) {
567 /* skip the device block if device type is invalid */
568 continue;
570 count++;
572 if (!count) {
573 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
574 return;
576 dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
577 if (!dev_priv->child_dev) {
578 DRM_DEBUG_KMS("No memory space for child device\n");
579 return;
582 dev_priv->child_dev_num = count;
583 count = 0;
584 for (i = 0; i < child_device_num; i++) {
585 p_child = &(p_defs->devices[i]);
586 if (!p_child->device_type) {
587 /* skip the device block if device type is invalid */
588 continue;
590 child_dev_ptr = dev_priv->child_dev + count;
591 count++;
592 memcpy((void *)child_dev_ptr, (void *)p_child,
593 sizeof(*p_child));
595 return;
598 static void
599 init_vbt_defaults(struct drm_i915_private *dev_priv)
601 struct drm_device *dev = dev_priv->dev;
603 dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
605 /* LFP panel data */
606 dev_priv->lvds_dither = 1;
607 dev_priv->lvds_vbt = 0;
609 /* SDVO panel data */
610 dev_priv->sdvo_lvds_vbt_mode = NULL;
612 /* general features */
613 dev_priv->int_tv_support = 1;
614 dev_priv->int_crt_support = 1;
616 /* Default to using SSC */
617 dev_priv->lvds_use_ssc = 1;
618 dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
619 DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
621 /* eDP data */
622 dev_priv->edp.bpp = 18;
625 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
627 DRM_DEBUG_KMS("Falling back to manually reading VBT from "
628 "VBIOS ROM for %s\n",
629 id->ident);
630 return 1;
633 static const struct dmi_system_id intel_no_opregion_vbt[] = {
635 .callback = intel_no_opregion_vbt_callback,
636 .ident = "ThinkCentre A57",
637 .matches = {
638 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
639 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
646 * intel_parse_bios - find VBT and initialize settings from the BIOS
647 * @dev: DRM device
649 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
650 * to appropriate values.
652 * Returns 0 on success, nonzero on failure.
654 bool
655 intel_parse_bios(struct drm_device *dev)
657 struct drm_i915_private *dev_priv = dev->dev_private;
658 struct pci_dev *pdev = dev->pdev;
659 struct bdb_header *bdb = NULL;
660 u8 __iomem *bios = NULL;
662 init_vbt_defaults(dev_priv);
664 /* XXX Should this validation be moved to intel_opregion.c? */
665 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
666 struct vbt_header *vbt = dev_priv->opregion.vbt;
667 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
668 DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
669 vbt->signature);
670 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
671 } else
672 dev_priv->opregion.vbt = NULL;
675 if (bdb == NULL) {
676 struct vbt_header *vbt = NULL;
677 size_t size;
678 int i;
680 bios = pci_map_rom(pdev, &size);
681 if (!bios)
682 return -1;
684 /* Scour memory looking for the VBT signature */
685 for (i = 0; i + 4 < size; i++) {
686 if (!memcmp(bios + i, "$VBT", 4)) {
687 vbt = (struct vbt_header *)(bios + i);
688 break;
692 if (!vbt) {
693 DRM_ERROR("VBT signature missing\n");
694 pci_unmap_rom(pdev, bios);
695 return -1;
698 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
701 /* Grab useful general definitions */
702 parse_general_features(dev_priv, bdb);
703 parse_general_definitions(dev_priv, bdb);
704 parse_lfp_panel_data(dev_priv, bdb);
705 parse_sdvo_panel_data(dev_priv, bdb);
706 parse_sdvo_device_mapping(dev_priv, bdb);
707 parse_device_mapping(dev_priv, bdb);
708 parse_driver_features(dev_priv, bdb);
709 parse_edp(dev_priv, bdb);
711 if (bios)
712 pci_unmap_rom(pdev, bios);
714 return 0;
717 /* Ensure that vital registers have been initialised, even if the BIOS
718 * is absent or just failing to do its job.
720 void intel_setup_bios(struct drm_device *dev)
722 struct drm_i915_private *dev_priv = dev->dev_private;
724 /* Set the Panel Power On/Off timings if uninitialized. */
725 if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
726 /* Set T2 to 40ms and T5 to 200ms */
727 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
729 /* Set T3 to 35ms and Tx to 200ms */
730 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);