drm/i915: Update to Linux 3.18
[dragonfly.git] / sys / dev / 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 <linux/dmi.h>
28 #include <drm/drmP.h>
29 #include <drm/drm_dp_helper.h>
30 #include <drm/i915_drm.h>
31 #include "i915_drv.h"
32 #include "intel_bios.h"
33 #include <linux/string.h>
34
35 #define SLAVE_ADDR1     0x70
36 #define SLAVE_ADDR2     0x72
37
38 static int panel_type;
39
40 static void *
41 find_section(struct bdb_header *bdb, int section_id)
42 {
43         u8 *base = (u8 *)bdb;
44         int index = 0;
45         u16 total, current_size;
46         u8 current_id;
47
48         /* skip to first section */
49         index += bdb->header_size;
50         total = bdb->bdb_size;
51
52         /* walk the sections looking for section_id */
53         while (index + 3 < total) {
54                 current_id = *(base + index);
55                 index++;
56
57                 current_size = *((u16 *)(base + index));
58                 index += 2;
59
60                 if (index + current_size > total)
61                         return NULL;
62
63                 if (current_id == section_id)
64                         return base + index;
65
66                 index += current_size;
67         }
68
69         return NULL;
70 }
71
72 static u16
73 get_blocksize(void *p)
74 {
75         u16 *block_ptr, block_size;
76
77         block_ptr = (u16 *)((char *)p - 2);
78         block_size = *block_ptr;
79         return block_size;
80 }
81
82 static void
83 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
84                         const struct lvds_dvo_timing *dvo_timing)
85 {
86         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
87                 dvo_timing->hactive_lo;
88         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
89                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
90         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
91                 dvo_timing->hsync_pulse_width;
92         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
93                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
94
95         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
96                 dvo_timing->vactive_lo;
97         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
98                 dvo_timing->vsync_off;
99         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
100                 dvo_timing->vsync_pulse_width;
101         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
102                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
103         panel_fixed_mode->clock = dvo_timing->clock * 10;
104         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
105
106         if (dvo_timing->hsync_positive)
107                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
108         else
109                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
110
111         if (dvo_timing->vsync_positive)
112                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
113         else
114                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
115
116         /* Some VBTs have bogus h/vtotal values */
117         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
118                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
119         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
120                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
121
122         drm_mode_set_name(panel_fixed_mode);
123 }
124
125 static bool
126 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
127                            const struct lvds_dvo_timing *b)
128 {
129         if (a->hactive_hi != b->hactive_hi ||
130             a->hactive_lo != b->hactive_lo)
131                 return false;
132
133         if (a->hsync_off_hi != b->hsync_off_hi ||
134             a->hsync_off_lo != b->hsync_off_lo)
135                 return false;
136
137         if (a->hsync_pulse_width != b->hsync_pulse_width)
138                 return false;
139
140         if (a->hblank_hi != b->hblank_hi ||
141             a->hblank_lo != b->hblank_lo)
142                 return false;
143
144         if (a->vactive_hi != b->vactive_hi ||
145             a->vactive_lo != b->vactive_lo)
146                 return false;
147
148         if (a->vsync_off != b->vsync_off)
149                 return false;
150
151         if (a->vsync_pulse_width != b->vsync_pulse_width)
152                 return false;
153
154         if (a->vblank_hi != b->vblank_hi ||
155             a->vblank_lo != b->vblank_lo)
156                 return false;
157
158         return true;
159 }
160
161 static const struct lvds_dvo_timing *
162 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
163                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
164                     int index)
165 {
166         /*
167          * the size of fp_timing varies on the different platform.
168          * So calculate the DVO timing relative offset in LVDS data
169          * entry to get the DVO timing entry
170          */
171
172         int lfp_data_size =
173                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
174                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
175         int dvo_timing_offset =
176                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
177                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
178         const char *entry = (const char *)lvds_lfp_data->data + lfp_data_size * index;
179
180         return (const struct lvds_dvo_timing *)(entry + dvo_timing_offset);
181 }
182
183 /* get lvds_fp_timing entry
184  * this function may return NULL if the corresponding entry is invalid
185  */
186 static const struct lvds_fp_timing *
187 get_lvds_fp_timing(const struct bdb_header *bdb,
188                    const struct bdb_lvds_lfp_data *data,
189                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
190                    int index)
191 {
192         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
193         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
194         size_t ofs;
195
196         if (index >= ARRAY_SIZE(ptrs->ptr))
197                 return NULL;
198         ofs = ptrs->ptr[index].fp_timing_offset;
199         if (ofs < data_ofs ||
200             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
201                 return NULL;
202         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
203 }
204
205 /* Try to find integrated panel data */
206 static void
207 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
208                             struct bdb_header *bdb)
209 {
210         const struct bdb_lvds_options *lvds_options;
211         const struct bdb_lvds_lfp_data *lvds_lfp_data;
212         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
213         const struct lvds_dvo_timing *panel_dvo_timing;
214         const struct lvds_fp_timing *fp_timing;
215         struct drm_display_mode *panel_fixed_mode;
216         int i, downclock, drrs_mode;
217
218         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
219         if (!lvds_options)
220                 return;
221
222         dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
223         if (lvds_options->panel_type == 0xff)
224                 return;
225
226         panel_type = lvds_options->panel_type;
227
228         drrs_mode = (lvds_options->dps_panel_type_bits
229                                 >> (panel_type * 2)) & MODE_MASK;
230         /*
231          * VBT has static DRRS = 0 and seamless DRRS = 2.
232          * The below piece of code is required to adjust vbt.drrs_type
233          * to match the enum drrs_support_type.
234          */
235         switch (drrs_mode) {
236         case 0:
237                 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
238                 DRM_DEBUG_KMS("DRRS supported mode is static\n");
239                 break;
240         case 2:
241                 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
242                 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
243                 break;
244         default:
245                 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
246                 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
247                 break;
248         }
249
250         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
251         if (!lvds_lfp_data)
252                 return;
253
254         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
255         if (!lvds_lfp_data_ptrs)
256                 return;
257
258         dev_priv->vbt.lvds_vbt = 1;
259
260         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
261                                                lvds_lfp_data_ptrs,
262                                                lvds_options->panel_type);
263
264         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
265         if (!panel_fixed_mode)
266                 return;
267
268         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
269
270         dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
271
272         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
273         drm_mode_debug_printmodeline(panel_fixed_mode);
274
275         /*
276          * Iterate over the LVDS panel timing info to find the lowest clock
277          * for the native resolution.
278          */
279         downclock = panel_dvo_timing->clock;
280         for (i = 0; i < 16; i++) {
281                 const struct lvds_dvo_timing *dvo_timing;
282
283                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
284                                                  lvds_lfp_data_ptrs,
285                                                  i);
286                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
287                     dvo_timing->clock < downclock)
288                         downclock = dvo_timing->clock;
289         }
290
291         if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) {
292                 dev_priv->lvds_downclock_avail = 1;
293                 dev_priv->lvds_downclock = downclock * 10;
294                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
295                               "Normal Clock %dKHz, downclock %dKHz\n",
296                               panel_fixed_mode->clock, 10*downclock);
297         }
298
299         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
300                                        lvds_lfp_data_ptrs,
301                                        lvds_options->panel_type);
302         if (fp_timing) {
303                 /* check the resolution, just to be sure */
304                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
305                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
306                         dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
307                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
308                                       dev_priv->vbt.bios_lvds_val);
309                 }
310         }
311 }
312
313 static void
314 parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
315 {
316         const struct bdb_lfp_backlight_data *backlight_data;
317         const struct bdb_lfp_backlight_data_entry *entry;
318
319         backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
320         if (!backlight_data)
321                 return;
322
323         if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
324                 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
325                               backlight_data->entry_size);
326                 return;
327         }
328
329         entry = &backlight_data->data[panel_type];
330
331         dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
332         if (!dev_priv->vbt.backlight.present) {
333                 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
334                               entry->type);
335                 return;
336         }
337
338         dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
339         dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
340         dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
341         DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
342                       "active %s, min brightness %u, level %u\n",
343                       dev_priv->vbt.backlight.pwm_freq_hz,
344                       dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
345                       dev_priv->vbt.backlight.min_brightness,
346                       backlight_data->level[panel_type]);
347 }
348
349 /* Try to find sdvo panel data */
350 static void
351 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
352                       struct bdb_header *bdb)
353 {
354         struct lvds_dvo_timing *dvo_timing;
355         struct drm_display_mode *panel_fixed_mode;
356         int index;
357
358         index = i915.vbt_sdvo_panel_type;
359         if (index == -2) {
360                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
361                 return;
362         }
363
364         if (index == -1) {
365                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
366
367                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
368                 if (!sdvo_lvds_options)
369                         return;
370
371                 index = sdvo_lvds_options->panel_type;
372         }
373
374         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
375         if (!dvo_timing)
376                 return;
377
378         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
379         if (!panel_fixed_mode)
380                 return;
381
382         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
383
384         dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
385
386         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
387         drm_mode_debug_printmodeline(panel_fixed_mode);
388 }
389
390 static int intel_bios_ssc_frequency(struct drm_device *dev,
391                                     bool alternate)
392 {
393         switch (INTEL_INFO(dev)->gen) {
394         case 2:
395                 return alternate ? 66667 : 48000;
396         case 3:
397         case 4:
398                 return alternate ? 100000 : 96000;
399         default:
400                 return alternate ? 100000 : 120000;
401         }
402 }
403
404 static void
405 parse_general_features(struct drm_i915_private *dev_priv,
406                        struct bdb_header *bdb)
407 {
408         struct drm_device *dev = dev_priv->dev;
409         struct bdb_general_features *general;
410
411         general = find_section(bdb, BDB_GENERAL_FEATURES);
412         if (general) {
413                 dev_priv->vbt.int_tv_support = general->int_tv_support;
414                 dev_priv->vbt.int_crt_support = general->int_crt_support;
415                 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
416                 dev_priv->vbt.lvds_ssc_freq =
417                         intel_bios_ssc_frequency(dev, general->ssc_freq);
418                 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
419                 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
420                 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 fdi_rx_polarity_inverted %d\n",
421                               dev_priv->vbt.int_tv_support,
422                               dev_priv->vbt.int_crt_support,
423                               dev_priv->vbt.lvds_use_ssc,
424                               dev_priv->vbt.lvds_ssc_freq,
425                               dev_priv->vbt.display_clock_mode,
426                               dev_priv->vbt.fdi_rx_polarity_inverted);
427         }
428 }
429
430 static void
431 parse_general_definitions(struct drm_i915_private *dev_priv,
432                           struct bdb_header *bdb)
433 {
434         struct bdb_general_definitions *general;
435
436         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
437         if (general) {
438                 u16 block_size = get_blocksize(general);
439                 if (block_size >= sizeof(*general)) {
440                         int bus_pin = general->crt_ddc_gmbus_pin;
441                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
442                         if (intel_gmbus_is_port_valid(bus_pin))
443                                 dev_priv->vbt.crt_ddc_pin = bus_pin;
444                 } else {
445                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
446                                       block_size);
447                 }
448         }
449 }
450
451 static void
452 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
453                           struct bdb_header *bdb)
454 {
455         struct sdvo_device_mapping *p_mapping;
456         struct bdb_general_definitions *p_defs;
457         union child_device_config *p_child;
458         int i, child_device_num, count;
459         u16     block_size;
460
461         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
462         if (!p_defs) {
463                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
464                 return;
465         }
466         /* judge whether the size of child device meets the requirements.
467          * If the child device size obtained from general definition block
468          * is different with sizeof(struct child_device_config), skip the
469          * parsing of sdvo device info
470          */
471         if (p_defs->child_dev_size != sizeof(*p_child)) {
472                 /* different child dev size . Ignore it */
473                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
474                 return;
475         }
476         /* get the block size of general definitions */
477         block_size = get_blocksize(p_defs);
478         /* get the number of child device */
479         child_device_num = (block_size - sizeof(*p_defs)) /
480                                 sizeof(*p_child);
481         count = 0;
482         for (i = 0; i < child_device_num; i++) {
483                 p_child = &(p_defs->devices[i]);
484                 if (!p_child->old.device_type) {
485                         /* skip the device block if device type is invalid */
486                         continue;
487                 }
488                 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
489                         p_child->old.slave_addr != SLAVE_ADDR2) {
490                         /*
491                          * If the slave address is neither 0x70 nor 0x72,
492                          * it is not a SDVO device. Skip it.
493                          */
494                         continue;
495                 }
496                 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
497                         p_child->old.dvo_port != DEVICE_PORT_DVOC) {
498                         /* skip the incorrect SDVO port */
499                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
500                         continue;
501                 }
502                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
503                                 " %s port\n",
504                                 p_child->old.slave_addr,
505                                 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
506                                         "SDVOB" : "SDVOC");
507                 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
508                 if (!p_mapping->initialized) {
509                         p_mapping->dvo_port = p_child->old.dvo_port;
510                         p_mapping->slave_addr = p_child->old.slave_addr;
511                         p_mapping->dvo_wiring = p_child->old.dvo_wiring;
512                         p_mapping->ddc_pin = p_child->old.ddc_pin;
513                         p_mapping->i2c_pin = p_child->old.i2c_pin;
514                         p_mapping->initialized = 1;
515                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
516                                       p_mapping->dvo_port,
517                                       p_mapping->slave_addr,
518                                       p_mapping->dvo_wiring,
519                                       p_mapping->ddc_pin,
520                                       p_mapping->i2c_pin);
521                 } else {
522                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
523                                          "two SDVO device.\n");
524                 }
525                 if (p_child->old.slave2_addr) {
526                         /* Maybe this is a SDVO device with multiple inputs */
527                         /* And the mapping info is not added */
528                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
529                                 " is a SDVO device with multiple inputs.\n");
530                 }
531                 count++;
532         }
533
534         if (!count) {
535                 /* No SDVO device info is found */
536                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
537         }
538         return;
539 }
540
541 static void
542 parse_driver_features(struct drm_i915_private *dev_priv,
543                        struct bdb_header *bdb)
544 {
545         struct bdb_driver_features *driver;
546
547         driver = find_section(bdb, BDB_DRIVER_FEATURES);
548         if (!driver)
549                 return;
550
551         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
552                 dev_priv->vbt.edp_support = 1;
553
554         if (driver->dual_frequency)
555                 dev_priv->render_reclock_avail = true;
556
557         DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
558         /*
559          * If DRRS is not supported, drrs_type has to be set to 0.
560          * This is because, VBT is configured in such a way that
561          * static DRRS is 0 and DRRS not supported is represented by
562          * driver->drrs_enabled=false
563          */
564         if (!driver->drrs_enabled)
565                 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
566 }
567
568 static void
569 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
570 {
571         struct bdb_edp *edp;
572         struct edp_power_seq *edp_pps;
573         struct edp_link_params *edp_link_params;
574
575         edp = find_section(bdb, BDB_EDP);
576         if (!edp) {
577                 if (dev_priv->vbt.edp_support)
578                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
579                 return;
580         }
581
582         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
583         case EDP_18BPP:
584                 dev_priv->vbt.edp_bpp = 18;
585                 break;
586         case EDP_24BPP:
587                 dev_priv->vbt.edp_bpp = 24;
588                 break;
589         case EDP_30BPP:
590                 dev_priv->vbt.edp_bpp = 30;
591                 break;
592         }
593
594         /* Get the eDP sequencing and link info */
595         edp_pps = &edp->power_seqs[panel_type];
596         edp_link_params = &edp->link_params[panel_type];
597
598         dev_priv->vbt.edp_pps = *edp_pps;
599
600         switch (edp_link_params->rate) {
601         case EDP_RATE_1_62:
602                 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
603                 break;
604         case EDP_RATE_2_7:
605                 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
606                 break;
607         default:
608                 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
609                               edp_link_params->rate);
610                 break;
611         }
612
613         switch (edp_link_params->lanes) {
614         case EDP_LANE_1:
615                 dev_priv->vbt.edp_lanes = 1;
616                 break;
617         case EDP_LANE_2:
618                 dev_priv->vbt.edp_lanes = 2;
619                 break;
620         case EDP_LANE_4:
621                 dev_priv->vbt.edp_lanes = 4;
622                 break;
623         default:
624                 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
625                               edp_link_params->lanes);
626                 break;
627         }
628
629         switch (edp_link_params->preemphasis) {
630         case EDP_PREEMPHASIS_NONE:
631                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
632                 break;
633         case EDP_PREEMPHASIS_3_5dB:
634                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
635                 break;
636         case EDP_PREEMPHASIS_6dB:
637                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
638                 break;
639         case EDP_PREEMPHASIS_9_5dB:
640                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
641                 break;
642         default:
643                 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
644                               edp_link_params->preemphasis);
645                 break;
646         }
647
648         switch (edp_link_params->vswing) {
649         case EDP_VSWING_0_4V:
650                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
651                 break;
652         case EDP_VSWING_0_6V:
653                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
654                 break;
655         case EDP_VSWING_0_8V:
656                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
657                 break;
658         case EDP_VSWING_1_2V:
659                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
660                 break;
661         default:
662                 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
663                               edp_link_params->vswing);
664                 break;
665         }
666 }
667
668 static u8 *goto_next_sequence(u8 *data, int *size)
669 {
670         u16 len;
671         int tmp = *size;
672
673         if (--tmp < 0)
674                 return NULL;
675
676         /* goto first element */
677         data++;
678         while (1) {
679                 switch (*data) {
680                 case MIPI_SEQ_ELEM_SEND_PKT:
681                         /*
682                          * skip by this element payload size
683                          * skip elem id, command flag and data type
684                          */
685                         tmp -= 5;
686                         if (tmp < 0)
687                                 return NULL;
688
689                         data += 3;
690                         len = *((u16 *)data);
691
692                         tmp -= len;
693                         if (tmp < 0)
694                                 return NULL;
695
696                         /* skip by len */
697                         data = data + 2 + len;
698                         break;
699                 case MIPI_SEQ_ELEM_DELAY:
700                         /* skip by elem id, and delay is 4 bytes */
701                         tmp -= 5;
702                         if (tmp < 0)
703                                 return NULL;
704
705                         data += 5;
706                         break;
707                 case MIPI_SEQ_ELEM_GPIO:
708                         tmp -= 3;
709                         if (tmp < 0)
710                                 return NULL;
711
712                         data += 3;
713                         break;
714                 default:
715                         DRM_ERROR("Unknown element\n");
716                         return NULL;
717                 }
718
719                 /* end of sequence ? */
720                 if (*data == 0)
721                         break;
722         }
723
724         /* goto next sequence or end of block byte */
725         if (--tmp < 0)
726                 return NULL;
727
728         data++;
729
730         /* update amount of data left for the sequence block to be parsed */
731         *size = tmp;
732         return data;
733 }
734
735 static void
736 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
737 {
738         struct bdb_mipi_config *start;
739         struct bdb_mipi_sequence *sequence;
740         struct mipi_config *config;
741         struct mipi_pps_data *pps;
742         u8 *data, *seq_data;
743         int i, panel_id, seq_size;
744         u16 block_size;
745
746         /* parse MIPI blocks only if LFP type is MIPI */
747         if (!dev_priv->vbt.has_mipi)
748                 return;
749
750         /* Initialize this to undefined indicating no generic MIPI support */
751         dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
752
753         /* Block #40 is already parsed and panel_fixed_mode is
754          * stored in dev_priv->lfp_lvds_vbt_mode
755          * resuse this when needed
756          */
757
758         /* Parse #52 for panel index used from panel_type already
759          * parsed
760          */
761         start = find_section(bdb, BDB_MIPI_CONFIG);
762         if (!start) {
763                 DRM_DEBUG_KMS("No MIPI config BDB found");
764                 return;
765         }
766
767         DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
768                                                                 panel_type);
769
770         /*
771          * get hold of the correct configuration block and pps data as per
772          * the panel_type as index
773          */
774         config = &start->config[panel_type];
775         pps = &start->pps[panel_type];
776
777         /* store as of now full data. Trim when we realise all is not needed */
778         dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
779         if (!dev_priv->vbt.dsi.config)
780                 return;
781
782         dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
783         if (!dev_priv->vbt.dsi.pps) {
784                 kfree(dev_priv->vbt.dsi.config);
785                 return;
786         }
787
788         /* We have mandatory mipi config blocks. Initialize as generic panel */
789         dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
790
791         /* Check if we have sequence block as well */
792         sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
793         if (!sequence) {
794                 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
795                 return;
796         }
797
798         DRM_DEBUG_DRIVER("Found MIPI sequence block\n");
799
800         block_size = get_blocksize(sequence);
801
802         /*
803          * parse the sequence block for individual sequences
804          */
805         dev_priv->vbt.dsi.seq_version = sequence->version;
806
807         seq_data = &sequence->data[0];
808
809         /*
810          * sequence block is variable length and hence we need to parse and
811          * get the sequence data for specific panel id
812          */
813         for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) {
814                 panel_id = *seq_data;
815                 seq_size = *((u16 *) (seq_data + 1));
816                 if (panel_id == panel_type)
817                         break;
818
819                 /* skip the sequence including seq header of 3 bytes */
820                 seq_data = seq_data + 3 + seq_size;
821                 if ((seq_data - &sequence->data[0]) > block_size) {
822                         DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n");
823                         return;
824                 }
825         }
826
827         if (i == MAX_MIPI_CONFIGURATIONS) {
828                 DRM_ERROR("Sequence block detected but no valid configuration\n");
829                 return;
830         }
831
832         /* check if found sequence is completely within the sequence block
833          * just being paranoid */
834         if (seq_size > block_size) {
835                 DRM_ERROR("Corrupted sequence/size, bailing out\n");
836                 return;
837         }
838
839         /* skip the panel id(1 byte) and seq size(2 bytes) */
840         dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL);
841         if (!dev_priv->vbt.dsi.data)
842                 return;
843
844         /*
845          * loop into the sequence data and split into multiple sequneces
846          * There are only 5 types of sequences as of now
847          */
848         data = dev_priv->vbt.dsi.data;
849         dev_priv->vbt.dsi.size = seq_size;
850
851         /* two consecutive 0x00 indicate end of all sequences */
852         while (1) {
853                 int seq_id = *data;
854                 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) {
855                         dev_priv->vbt.dsi.sequence[seq_id] = data;
856                         DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id);
857                 } else {
858                         DRM_ERROR("undefined sequence\n");
859                         goto err;
860                 }
861
862                 /* partial parsing to skip elements */
863                 data = goto_next_sequence(data, &seq_size);
864
865                 if (data == NULL) {
866                         DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n");
867                         goto err;
868                 }
869
870                 if (*data == 0)
871                         break; /* end of sequence reached */
872         }
873
874         DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n");
875         return;
876 err:
877         kfree(dev_priv->vbt.dsi.data);
878         dev_priv->vbt.dsi.data = NULL;
879
880         /* error during parsing so set all pointers to null
881          * because of partial parsing */
882         memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
883 }
884
885 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
886                            struct bdb_header *bdb)
887 {
888         union child_device_config *it, *child = NULL;
889         struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
890         uint8_t hdmi_level_shift;
891         int i, j;
892         bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
893         uint8_t aux_channel;
894         /* Each DDI port can have more than one value on the "DVO Port" field,
895          * so look for all the possible values for each port and abort if more
896          * than one is found. */
897         int dvo_ports[][2] = {
898                 {DVO_PORT_HDMIA, DVO_PORT_DPA},
899                 {DVO_PORT_HDMIB, DVO_PORT_DPB},
900                 {DVO_PORT_HDMIC, DVO_PORT_DPC},
901                 {DVO_PORT_HDMID, DVO_PORT_DPD},
902                 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
903         };
904
905         /* Find the child device to use, abort if more than one found. */
906         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
907                 it = dev_priv->vbt.child_dev + i;
908
909                 for (j = 0; j < 2; j++) {
910                         if (dvo_ports[port][j] == -1)
911                                 break;
912
913                         if (it->common.dvo_port == dvo_ports[port][j]) {
914                                 if (child) {
915                                         DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
916                                                       port_name(port));
917                                         return;
918                                 }
919                                 child = it;
920                         }
921                 }
922         }
923         if (!child)
924                 return;
925
926         aux_channel = child->raw[25];
927
928         is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
929         is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
930         is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
931         is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
932         is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
933
934         info->supports_dvi = is_dvi;
935         info->supports_hdmi = is_hdmi;
936         info->supports_dp = is_dp;
937
938         DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
939                       port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
940
941         if (is_edp && is_dvi)
942                 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
943                               port_name(port));
944         if (is_crt && port != PORT_E)
945                 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
946         if (is_crt && (is_dvi || is_dp))
947                 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
948                               port_name(port));
949         if (is_dvi && (port == PORT_A || port == PORT_E))
950                 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
951         if (!is_dvi && !is_dp && !is_crt)
952                 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
953                               port_name(port));
954         if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
955                 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
956
957         if (is_dvi) {
958                 if (child->common.ddc_pin == 0x05 && port != PORT_B)
959                         DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
960                 if (child->common.ddc_pin == 0x04 && port != PORT_C)
961                         DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
962                 if (child->common.ddc_pin == 0x06 && port != PORT_D)
963                         DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
964         }
965
966         if (is_dp) {
967                 if (aux_channel == 0x40 && port != PORT_A)
968                         DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
969                 if (aux_channel == 0x10 && port != PORT_B)
970                         DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
971                 if (aux_channel == 0x20 && port != PORT_C)
972                         DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
973                 if (aux_channel == 0x30 && port != PORT_D)
974                         DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
975         }
976
977         if (bdb->version >= 158) {
978                 /* The VBT HDMI level shift values match the table we have. */
979                 hdmi_level_shift = child->raw[7] & 0xF;
980                 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
981                               port_name(port),
982                               hdmi_level_shift);
983                 info->hdmi_level_shift = hdmi_level_shift;
984         }
985 }
986
987 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
988                             struct bdb_header *bdb)
989 {
990         struct drm_device *dev = dev_priv->dev;
991         enum port port;
992
993         if (!HAS_DDI(dev))
994                 return;
995
996         if (!dev_priv->vbt.child_dev_num)
997                 return;
998
999         if (bdb->version < 155)
1000                 return;
1001
1002         for (port = PORT_A; port < I915_MAX_PORTS; port++)
1003                 parse_ddi_port(dev_priv, port, bdb);
1004 }
1005
1006 static void
1007 parse_device_mapping(struct drm_i915_private *dev_priv,
1008                        struct bdb_header *bdb)
1009 {
1010         struct bdb_general_definitions *p_defs;
1011         union child_device_config *p_child, *child_dev_ptr;
1012         int i, child_device_num, count;
1013         u16     block_size;
1014
1015         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1016         if (!p_defs) {
1017                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1018                 return;
1019         }
1020         /* judge whether the size of child device meets the requirements.
1021          * If the child device size obtained from general definition block
1022          * is different with sizeof(struct child_device_config), skip the
1023          * parsing of sdvo device info
1024          */
1025         if (p_defs->child_dev_size != sizeof(*p_child)) {
1026                 /* different child dev size . Ignore it */
1027                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
1028                 return;
1029         }
1030         /* get the block size of general definitions */
1031         block_size = get_blocksize(p_defs);
1032         /* get the number of child device */
1033         child_device_num = (block_size - sizeof(*p_defs)) /
1034                                 sizeof(*p_child);
1035         count = 0;
1036         /* get the number of child device that is present */
1037         for (i = 0; i < child_device_num; i++) {
1038                 p_child = &(p_defs->devices[i]);
1039                 if (!p_child->common.device_type) {
1040                         /* skip the device block if device type is invalid */
1041                         continue;
1042                 }
1043                 count++;
1044         }
1045         if (!count) {
1046                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1047                 return;
1048         }
1049         dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1050         if (!dev_priv->vbt.child_dev) {
1051                 DRM_DEBUG_KMS("No memory space for child device\n");
1052                 return;
1053         }
1054
1055         dev_priv->vbt.child_dev_num = count;
1056         count = 0;
1057         for (i = 0; i < child_device_num; i++) {
1058                 p_child = &(p_defs->devices[i]);
1059                 if (!p_child->common.device_type) {
1060                         /* skip the device block if device type is invalid */
1061                         continue;
1062                 }
1063
1064                 if (p_child->common.dvo_port >= DVO_PORT_MIPIA
1065                     && p_child->common.dvo_port <= DVO_PORT_MIPID
1066                     &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) {
1067                         DRM_DEBUG_KMS("Found MIPI as LFP\n");
1068                         dev_priv->vbt.has_mipi = 1;
1069                         dev_priv->vbt.dsi.port = p_child->common.dvo_port;
1070                 }
1071
1072                 child_dev_ptr = dev_priv->vbt.child_dev + count;
1073                 count++;
1074                 memcpy((void *)child_dev_ptr, (void *)p_child,
1075                                         sizeof(*p_child));
1076         }
1077         return;
1078 }
1079
1080 static void
1081 init_vbt_defaults(struct drm_i915_private *dev_priv)
1082 {
1083         struct drm_device *dev = dev_priv->dev;
1084         enum port port;
1085
1086         dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
1087
1088         /* Default to having backlight */
1089         dev_priv->vbt.backlight.present = true;
1090
1091         /* LFP panel data */
1092         dev_priv->vbt.lvds_dither = 1;
1093         dev_priv->vbt.lvds_vbt = 0;
1094
1095         /* SDVO panel data */
1096         dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1097
1098         /* general features */
1099         dev_priv->vbt.int_tv_support = 1;
1100         dev_priv->vbt.int_crt_support = 1;
1101
1102         /* Default to using SSC */
1103         dev_priv->vbt.lvds_use_ssc = 1;
1104         /*
1105          * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1106          * clock for LVDS.
1107          */
1108         dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
1109                         !HAS_PCH_SPLIT(dev));
1110         DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1111
1112         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1113                 struct ddi_vbt_port_info *info =
1114                         &dev_priv->vbt.ddi_port_info[port];
1115
1116                 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1117
1118                 info->supports_dvi = (port != PORT_A && port != PORT_E);
1119                 info->supports_hdmi = info->supports_dvi;
1120                 info->supports_dp = (port != PORT_E);
1121         }
1122 }
1123
1124 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
1125 {
1126         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
1127                       "VBIOS ROM for %s\n",
1128                       id->ident);
1129         return 1;
1130 }
1131
1132 static const struct dmi_system_id intel_no_opregion_vbt[] = {
1133         {
1134                 .callback = intel_no_opregion_vbt_callback,
1135                 .ident = "ThinkCentre A57",
1136                 .matches = {
1137                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1138                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
1139                 },
1140         },
1141         { }
1142 };
1143
1144 static struct bdb_header *validate_vbt(char *base, size_t size,
1145                                        struct vbt_header *vbt,
1146                                        const char *source)
1147 {
1148         size_t offset;
1149         struct bdb_header *bdb;
1150
1151         if (vbt == NULL) {
1152                 DRM_DEBUG_DRIVER("VBT signature missing\n");
1153                 return NULL;
1154         }
1155
1156         offset = (char *)vbt - base;
1157         if (offset + sizeof(struct vbt_header) > size) {
1158                 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1159                 return NULL;
1160         }
1161
1162         if (memcmp(vbt->signature, "$VBT", 4)) {
1163                 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1164                 return NULL;
1165         }
1166
1167         offset += vbt->bdb_offset;
1168         if (offset + sizeof(struct bdb_header) > size) {
1169                 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1170                 return NULL;
1171         }
1172
1173         bdb = (struct bdb_header *)(base + offset);
1174         if (offset + bdb->bdb_size > size) {
1175                 DRM_DEBUG_DRIVER("BDB incomplete\n");
1176                 return NULL;
1177         }
1178
1179         DRM_DEBUG_KMS("Using VBT from %s: %20s\n",
1180                       source, vbt->signature);
1181         return bdb;
1182 }
1183
1184 /**
1185  * intel_parse_bios - find VBT and initialize settings from the BIOS
1186  * @dev: DRM device
1187  *
1188  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
1189  * to appropriate values.
1190  *
1191  * Returns 0 on success, nonzero on failure.
1192  */
1193 int
1194 intel_parse_bios(struct drm_device *dev)
1195 {
1196         struct drm_i915_private *dev_priv = dev->dev_private;
1197 #if 0
1198         struct pci_dev *pdev = dev->pdev;
1199 #endif
1200         struct bdb_header *bdb = NULL;
1201         u8 __iomem *bios = NULL;
1202
1203         if (HAS_PCH_NOP(dev))
1204                 return -ENODEV;
1205
1206         init_vbt_defaults(dev_priv);
1207
1208         /* XXX Should this validation be moved to intel_opregion.c? */
1209         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt)
1210                 bdb = validate_vbt((char *)dev_priv->opregion.header, OPREGION_SIZE,
1211                                    (struct vbt_header *)dev_priv->opregion.vbt,
1212                                    "OpRegion");
1213
1214         if (bdb == NULL) {
1215                 size_t i, size;
1216
1217 #if 0
1218                 bios = pci_map_rom(pdev, &size);
1219                 if (!bios)
1220 #endif
1221                         return -1;
1222
1223                 /* Scour memory looking for the VBT signature */
1224                 for (i = 0; i + 4 < size; i++) {
1225                         if (memcmp(bios + i, "$VBT", 4) == 0) {
1226                                 bdb = validate_vbt(bios, size,
1227                                                    (struct vbt_header *)(bios + i),
1228                                                    "PCI ROM");
1229                                 break;
1230                         }
1231                 }
1232
1233                 if (!bdb) {
1234 #if 0
1235                         pci_unmap_rom(pdev, bios);
1236 #endif
1237                         return -1;
1238                 }
1239         }
1240
1241         /* Grab useful general definitions */
1242         parse_general_features(dev_priv, bdb);
1243         parse_general_definitions(dev_priv, bdb);
1244         parse_lfp_panel_data(dev_priv, bdb);
1245         parse_lfp_backlight(dev_priv, bdb);
1246         parse_sdvo_panel_data(dev_priv, bdb);
1247         parse_sdvo_device_mapping(dev_priv, bdb);
1248         parse_device_mapping(dev_priv, bdb);
1249         parse_driver_features(dev_priv, bdb);
1250         parse_edp(dev_priv, bdb);
1251         parse_mipi(dev_priv, bdb);
1252         parse_ddi_ports(dev_priv, bdb);
1253
1254 #if 0
1255         if (bios)
1256                 pci_unmap_rom(pdev, bios);
1257 #endif
1258
1259         return 0;
1260 }
1261
1262 /* Ensure that vital registers have been initialised, even if the BIOS
1263  * is absent or just failing to do its job.
1264  */
1265 void intel_setup_bios(struct drm_device *dev)
1266 {
1267         struct drm_i915_private *dev_priv = dev->dev_private;
1268
1269          /* Set the Panel Power On/Off timings if uninitialized. */
1270         if (!HAS_PCH_SPLIT(dev) &&
1271             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
1272                 /* Set T2 to 40ms and T5 to 200ms */
1273                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
1274
1275                 /* Set T3 to 35ms and Tx to 200ms */
1276                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
1277         }
1278 }