drm/i915: Check VBIOS value for determining LVDS dual channel mode, too
[linux-2.6.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 <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"
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 < 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;
61         }
62
63         return NULL;
64 }
65
66 static u16
67 get_blocksize(void *p)
68 {
69         u16 *block_ptr, block_size;
70
71         block_ptr = (u16 *)((char *)p - 2);
72         block_size = *block_ptr;
73         return block_size;
74 }
75
76 static void
77 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
78                         const struct lvds_dvo_timing *dvo_timing)
79 {
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);
88
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;
99
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;
104
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;
109
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;
115
116         drm_mode_set_name(panel_fixed_mode);
117 }
118
119 static bool
120 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
121                            const struct lvds_dvo_timing *b)
122 {
123         if (a->hactive_hi != b->hactive_hi ||
124             a->hactive_lo != b->hactive_lo)
125                 return false;
126
127         if (a->hsync_off_hi != b->hsync_off_hi ||
128             a->hsync_off_lo != b->hsync_off_lo)
129                 return false;
130
131         if (a->hsync_pulse_width != b->hsync_pulse_width)
132                 return false;
133
134         if (a->hblank_hi != b->hblank_hi ||
135             a->hblank_lo != b->hblank_lo)
136                 return false;
137
138         if (a->vactive_hi != b->vactive_hi ||
139             a->vactive_lo != b->vactive_lo)
140                 return false;
141
142         if (a->vsync_off != b->vsync_off)
143                 return false;
144
145         if (a->vsync_pulse_width != b->vsync_pulse_width)
146                 return false;
147
148         if (a->vblank_hi != b->vblank_hi ||
149             a->vblank_lo != b->vblank_lo)
150                 return false;
151
152         return true;
153 }
154
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)
159 {
160         /*
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
164          */
165
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;
173
174         return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
175 }
176
177 /* get lvds_fp_timing entry
178  * this function may return NULL if the corresponding entry is invalid
179  */
180 static const struct lvds_fp_timing *
181 get_lvds_fp_timing(const struct bdb_header *bdb,
182                    const struct bdb_lvds_lfp_data *data,
183                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
184                    int index)
185 {
186         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
187         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
188         size_t ofs;
189
190         if (index >= ARRAY_SIZE(ptrs->ptr))
191                 return NULL;
192         ofs = ptrs->ptr[index].fp_timing_offset;
193         if (ofs < data_ofs ||
194             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
195                 return NULL;
196         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
197 }
198
199 /* Try to find integrated panel data */
200 static void
201 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
202                             struct bdb_header *bdb)
203 {
204         const struct bdb_lvds_options *lvds_options;
205         const struct bdb_lvds_lfp_data *lvds_lfp_data;
206         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
207         const struct lvds_dvo_timing *panel_dvo_timing;
208         const struct lvds_fp_timing *fp_timing;
209         struct drm_display_mode *panel_fixed_mode;
210         int i, downclock;
211
212         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
213         if (!lvds_options)
214                 return;
215
216         dev_priv->lvds_dither = lvds_options->pixel_dither;
217         if (lvds_options->panel_type == 0xff)
218                 return;
219
220         panel_type = lvds_options->panel_type;
221
222         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
223         if (!lvds_lfp_data)
224                 return;
225
226         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
227         if (!lvds_lfp_data_ptrs)
228                 return;
229
230         dev_priv->lvds_vbt = 1;
231
232         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
233                                                lvds_lfp_data_ptrs,
234                                                lvds_options->panel_type);
235
236         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
237         if (!panel_fixed_mode)
238                 return;
239
240         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
241
242         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
243
244         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
245         drm_mode_debug_printmodeline(panel_fixed_mode);
246
247         /*
248          * Iterate over the LVDS panel timing info to find the lowest clock
249          * for the native resolution.
250          */
251         downclock = panel_dvo_timing->clock;
252         for (i = 0; i < 16; i++) {
253                 const struct lvds_dvo_timing *dvo_timing;
254
255                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
256                                                  lvds_lfp_data_ptrs,
257                                                  i);
258                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
259                     dvo_timing->clock < downclock)
260                         downclock = dvo_timing->clock;
261         }
262
263         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
264                 dev_priv->lvds_downclock_avail = 1;
265                 dev_priv->lvds_downclock = downclock * 10;
266                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
267                               "Normal Clock %dKHz, downclock %dKHz\n",
268                               panel_fixed_mode->clock, 10*downclock);
269         }
270
271         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
272                                        lvds_lfp_data_ptrs,
273                                        lvds_options->panel_type);
274         if (fp_timing) {
275                 /* check the resolution, just to be sure */
276                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
277                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
278                         dev_priv->bios_lvds_val = fp_timing->lvds_reg_val;
279                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
280                                       dev_priv->bios_lvds_val);
281                 }
282         }
283 }
284
285 /* Try to find sdvo panel data */
286 static void
287 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
288                       struct bdb_header *bdb)
289 {
290         struct lvds_dvo_timing *dvo_timing;
291         struct drm_display_mode *panel_fixed_mode;
292         int index;
293
294         index = i915_vbt_sdvo_panel_type;
295         if (index == -1) {
296                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
297
298                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
299                 if (!sdvo_lvds_options)
300                         return;
301
302                 index = sdvo_lvds_options->panel_type;
303         }
304
305         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
306         if (!dvo_timing)
307                 return;
308
309         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
310         if (!panel_fixed_mode)
311                 return;
312
313         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
314
315         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
316
317         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
318         drm_mode_debug_printmodeline(panel_fixed_mode);
319 }
320
321 static int intel_bios_ssc_frequency(struct drm_device *dev,
322                                     bool alternate)
323 {
324         switch (INTEL_INFO(dev)->gen) {
325         case 2:
326                 return alternate ? 66 : 48;
327         case 3:
328         case 4:
329                 return alternate ? 100 : 96;
330         default:
331                 return alternate ? 100 : 120;
332         }
333 }
334
335 static void
336 parse_general_features(struct drm_i915_private *dev_priv,
337                        struct bdb_header *bdb)
338 {
339         struct drm_device *dev = dev_priv->dev;
340         struct bdb_general_features *general;
341
342         general = find_section(bdb, BDB_GENERAL_FEATURES);
343         if (general) {
344                 dev_priv->int_tv_support = general->int_tv_support;
345                 dev_priv->int_crt_support = general->int_crt_support;
346                 dev_priv->lvds_use_ssc = general->enable_ssc;
347                 dev_priv->lvds_ssc_freq =
348                         intel_bios_ssc_frequency(dev, general->ssc_freq);
349                 dev_priv->display_clock_mode = general->display_clock_mode;
350                 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",
351                               dev_priv->int_tv_support,
352                               dev_priv->int_crt_support,
353                               dev_priv->lvds_use_ssc,
354                               dev_priv->lvds_ssc_freq,
355                               dev_priv->display_clock_mode);
356         }
357 }
358
359 static void
360 parse_general_definitions(struct drm_i915_private *dev_priv,
361                           struct bdb_header *bdb)
362 {
363         struct bdb_general_definitions *general;
364
365         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
366         if (general) {
367                 u16 block_size = get_blocksize(general);
368                 if (block_size >= sizeof(*general)) {
369                         int bus_pin = general->crt_ddc_gmbus_pin;
370                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
371                         if (bus_pin >= 1 && bus_pin <= 6)
372                                 dev_priv->crt_ddc_pin = bus_pin;
373                 } else {
374                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
375                                   block_size);
376                 }
377         }
378 }
379
380 static void
381 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
382                           struct bdb_header *bdb)
383 {
384         struct sdvo_device_mapping *p_mapping;
385         struct bdb_general_definitions *p_defs;
386         struct child_device_config *p_child;
387         int i, child_device_num, count;
388         u16     block_size;
389
390         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
391         if (!p_defs) {
392                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
393                 return;
394         }
395         /* judge whether the size of child device meets the requirements.
396          * If the child device size obtained from general definition block
397          * is different with sizeof(struct child_device_config), skip the
398          * parsing of sdvo device info
399          */
400         if (p_defs->child_dev_size != sizeof(*p_child)) {
401                 /* different child dev size . Ignore it */
402                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
403                 return;
404         }
405         /* get the block size of general definitions */
406         block_size = get_blocksize(p_defs);
407         /* get the number of child device */
408         child_device_num = (block_size - sizeof(*p_defs)) /
409                                 sizeof(*p_child);
410         count = 0;
411         for (i = 0; i < child_device_num; i++) {
412                 p_child = &(p_defs->devices[i]);
413                 if (!p_child->device_type) {
414                         /* skip the device block if device type is invalid */
415                         continue;
416                 }
417                 if (p_child->slave_addr != SLAVE_ADDR1 &&
418                         p_child->slave_addr != SLAVE_ADDR2) {
419                         /*
420                          * If the slave address is neither 0x70 nor 0x72,
421                          * it is not a SDVO device. Skip it.
422                          */
423                         continue;
424                 }
425                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
426                         p_child->dvo_port != DEVICE_PORT_DVOC) {
427                         /* skip the incorrect SDVO port */
428                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
429                         continue;
430                 }
431                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
432                                 " %s port\n",
433                                 p_child->slave_addr,
434                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
435                                         "SDVOB" : "SDVOC");
436                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
437                 if (!p_mapping->initialized) {
438                         p_mapping->dvo_port = p_child->dvo_port;
439                         p_mapping->slave_addr = p_child->slave_addr;
440                         p_mapping->dvo_wiring = p_child->dvo_wiring;
441                         p_mapping->ddc_pin = p_child->ddc_pin;
442                         p_mapping->i2c_pin = p_child->i2c_pin;
443                         p_mapping->initialized = 1;
444                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
445                                       p_mapping->dvo_port,
446                                       p_mapping->slave_addr,
447                                       p_mapping->dvo_wiring,
448                                       p_mapping->ddc_pin,
449                                       p_mapping->i2c_pin);
450                 } else {
451                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
452                                          "two SDVO device.\n");
453                 }
454                 if (p_child->slave2_addr) {
455                         /* Maybe this is a SDVO device with multiple inputs */
456                         /* And the mapping info is not added */
457                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
458                                 " is a SDVO device with multiple inputs.\n");
459                 }
460                 count++;
461         }
462
463         if (!count) {
464                 /* No SDVO device info is found */
465                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
466         }
467         return;
468 }
469
470 static void
471 parse_driver_features(struct drm_i915_private *dev_priv,
472                        struct bdb_header *bdb)
473 {
474         struct drm_device *dev = dev_priv->dev;
475         struct bdb_driver_features *driver;
476
477         driver = find_section(bdb, BDB_DRIVER_FEATURES);
478         if (!driver)
479                 return;
480
481         if (SUPPORTS_EDP(dev) &&
482             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
483                 dev_priv->edp.support = 1;
484
485         if (driver->dual_frequency)
486                 dev_priv->render_reclock_avail = true;
487 }
488
489 static void
490 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
491 {
492         struct bdb_edp *edp;
493         struct edp_power_seq *edp_pps;
494         struct edp_link_params *edp_link_params;
495
496         edp = find_section(bdb, BDB_EDP);
497         if (!edp) {
498                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support)
499                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
500                 return;
501         }
502
503         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
504         case EDP_18BPP:
505                 dev_priv->edp.bpp = 18;
506                 break;
507         case EDP_24BPP:
508                 dev_priv->edp.bpp = 24;
509                 break;
510         case EDP_30BPP:
511                 dev_priv->edp.bpp = 30;
512                 break;
513         }
514
515         /* Get the eDP sequencing and link info */
516         edp_pps = &edp->power_seqs[panel_type];
517         edp_link_params = &edp->link_params[panel_type];
518
519         dev_priv->edp.pps = *edp_pps;
520
521         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
522                 DP_LINK_BW_1_62;
523         switch (edp_link_params->lanes) {
524         case 0:
525                 dev_priv->edp.lanes = 1;
526                 break;
527         case 1:
528                 dev_priv->edp.lanes = 2;
529                 break;
530         case 3:
531         default:
532                 dev_priv->edp.lanes = 4;
533                 break;
534         }
535         switch (edp_link_params->preemphasis) {
536         case 0:
537                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
538                 break;
539         case 1:
540                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
541                 break;
542         case 2:
543                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
544                 break;
545         case 3:
546                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
547                 break;
548         }
549         switch (edp_link_params->vswing) {
550         case 0:
551                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
552                 break;
553         case 1:
554                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
555                 break;
556         case 2:
557                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
558                 break;
559         case 3:
560                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
561                 break;
562         }
563 }
564
565 static void
566 parse_device_mapping(struct drm_i915_private *dev_priv,
567                        struct bdb_header *bdb)
568 {
569         struct bdb_general_definitions *p_defs;
570         struct child_device_config *p_child, *child_dev_ptr;
571         int i, child_device_num, count;
572         u16     block_size;
573
574         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
575         if (!p_defs) {
576                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
577                 return;
578         }
579         /* judge whether the size of child device meets the requirements.
580          * If the child device size obtained from general definition block
581          * is different with sizeof(struct child_device_config), skip the
582          * parsing of sdvo device info
583          */
584         if (p_defs->child_dev_size != sizeof(*p_child)) {
585                 /* different child dev size . Ignore it */
586                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
587                 return;
588         }
589         /* get the block size of general definitions */
590         block_size = get_blocksize(p_defs);
591         /* get the number of child device */
592         child_device_num = (block_size - sizeof(*p_defs)) /
593                                 sizeof(*p_child);
594         count = 0;
595         /* get the number of child device that is present */
596         for (i = 0; i < child_device_num; i++) {
597                 p_child = &(p_defs->devices[i]);
598                 if (!p_child->device_type) {
599                         /* skip the device block if device type is invalid */
600                         continue;
601                 }
602                 count++;
603         }
604         if (!count) {
605                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
606                 return;
607         }
608         dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
609         if (!dev_priv->child_dev) {
610                 DRM_DEBUG_KMS("No memory space for child device\n");
611                 return;
612         }
613
614         dev_priv->child_dev_num = count;
615         count = 0;
616         for (i = 0; i < child_device_num; i++) {
617                 p_child = &(p_defs->devices[i]);
618                 if (!p_child->device_type) {
619                         /* skip the device block if device type is invalid */
620                         continue;
621                 }
622                 child_dev_ptr = dev_priv->child_dev + count;
623                 count++;
624                 memcpy((void *)child_dev_ptr, (void *)p_child,
625                                         sizeof(*p_child));
626         }
627         return;
628 }
629
630 static void
631 init_vbt_defaults(struct drm_i915_private *dev_priv)
632 {
633         struct drm_device *dev = dev_priv->dev;
634
635         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
636
637         /* LFP panel data */
638         dev_priv->lvds_dither = 1;
639         dev_priv->lvds_vbt = 0;
640
641         /* SDVO panel data */
642         dev_priv->sdvo_lvds_vbt_mode = NULL;
643
644         /* general features */
645         dev_priv->int_tv_support = 1;
646         dev_priv->int_crt_support = 1;
647
648         /* Default to using SSC */
649         dev_priv->lvds_use_ssc = 1;
650         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
651         DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
652 }
653
654 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
655 {
656         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
657                       "VBIOS ROM for %s\n",
658                       id->ident);
659         return 1;
660 }
661
662 static const struct dmi_system_id intel_no_opregion_vbt[] = {
663         {
664                 .callback = intel_no_opregion_vbt_callback,
665                 .ident = "ThinkCentre A57",
666                 .matches = {
667                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
668                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
669                 },
670         },
671         { }
672 };
673
674 /**
675  * intel_parse_bios - find VBT and initialize settings from the BIOS
676  * @dev: DRM device
677  *
678  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
679  * to appropriate values.
680  *
681  * Returns 0 on success, nonzero on failure.
682  */
683 bool
684 intel_parse_bios(struct drm_device *dev)
685 {
686         struct drm_i915_private *dev_priv = dev->dev_private;
687         struct pci_dev *pdev = dev->pdev;
688         struct bdb_header *bdb = NULL;
689         u8 __iomem *bios = NULL;
690
691         init_vbt_defaults(dev_priv);
692
693         /* XXX Should this validation be moved to intel_opregion.c? */
694         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
695                 struct vbt_header *vbt = dev_priv->opregion.vbt;
696                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
697                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
698                                          vbt->signature);
699                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
700                 } else
701                         dev_priv->opregion.vbt = NULL;
702         }
703
704         if (bdb == NULL) {
705                 struct vbt_header *vbt = NULL;
706                 size_t size;
707                 int i;
708
709                 bios = pci_map_rom(pdev, &size);
710                 if (!bios)
711                         return -1;
712
713                 /* Scour memory looking for the VBT signature */
714                 for (i = 0; i + 4 < size; i++) {
715                         if (!memcmp(bios + i, "$VBT", 4)) {
716                                 vbt = (struct vbt_header *)(bios + i);
717                                 break;
718                         }
719                 }
720
721                 if (!vbt) {
722                         DRM_DEBUG_DRIVER("VBT signature missing\n");
723                         pci_unmap_rom(pdev, bios);
724                         return -1;
725                 }
726
727                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
728         }
729
730         /* Grab useful general definitions */
731         parse_general_features(dev_priv, bdb);
732         parse_general_definitions(dev_priv, bdb);
733         parse_lfp_panel_data(dev_priv, bdb);
734         parse_sdvo_panel_data(dev_priv, bdb);
735         parse_sdvo_device_mapping(dev_priv, bdb);
736         parse_device_mapping(dev_priv, bdb);
737         parse_driver_features(dev_priv, bdb);
738         parse_edp(dev_priv, bdb);
739
740         if (bios)
741                 pci_unmap_rom(pdev, bios);
742
743         return 0;
744 }
745
746 /* Ensure that vital registers have been initialised, even if the BIOS
747  * is absent or just failing to do its job.
748  */
749 void intel_setup_bios(struct drm_device *dev)
750 {
751         struct drm_i915_private *dev_priv = dev->dev_private;
752
753          /* Set the Panel Power On/Off timings if uninitialized. */
754         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
755                 /* Set T2 to 40ms and T5 to 200ms */
756                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
757
758                 /* Set T3 to 35ms and Tx to 200ms */
759                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
760         }
761 }