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1/*
2 * Copyright © 2006 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27#include <drm/drm_dp_helper.h>
28#include "drmP.h"
29#include "drm.h"
30#include "i915_drm.h"
31#include "i915_drv.h"
32#include "intel_bios.h"
33
34#define SLAVE_ADDR1 0x70
35#define SLAVE_ADDR2 0x72
36
37static int panel_type;
38
39static void *
40find_section(struct bdb_header *bdb, int section_id)
41{
42 u8 *base = (u8 *)bdb;
43 int index = 0;
44 u16 total, current_size;
45 u8 current_id;
46
47 /* skip to first section */
48 index += bdb->header_size;
49 total = bdb->bdb_size;
50
51 /* walk the sections looking for section_id */
52 while (index < total) {
53 current_id = *(base + index);
54 index++;
55 current_size = *((u16 *)(base + index));
56 index += 2;
57 if (current_id == section_id)
58 return base + index;
59 index += current_size;
60 }
61
62 return NULL;
63}
64
65static u16
66get_blocksize(void *p)
67{
68 u16 *block_ptr, block_size;
69
70 block_ptr = (u16 *)((char *)p - 2);
71 block_size = *block_ptr;
72 return block_size;
73}
74
75static void
76fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
77 const struct lvds_dvo_timing *dvo_timing)
78{
79 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
80 dvo_timing->hactive_lo;
81 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
82 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
83 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
84 dvo_timing->hsync_pulse_width;
85 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
86 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
87
88 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
89 dvo_timing->vactive_lo;
90 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
91 dvo_timing->vsync_off;
92 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
93 dvo_timing->vsync_pulse_width;
94 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
95 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
96 panel_fixed_mode->clock = dvo_timing->clock * 10;
97 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
98
99 if (dvo_timing->hsync_positive)
100 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
101 else
102 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
103
104 if (dvo_timing->vsync_positive)
105 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
106 else
107 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
108
109 /* Some VBTs have bogus h/vtotal values */
110 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
111 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
112 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
113 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
114
115 drm_mode_set_name(panel_fixed_mode);
116}
117
118static bool
119lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
120 const struct lvds_dvo_timing *b)
121{
122 if (a->hactive_hi != b->hactive_hi ||
123 a->hactive_lo != b->hactive_lo)
124 return false;
125
126 if (a->hsync_off_hi != b->hsync_off_hi ||
127 a->hsync_off_lo != b->hsync_off_lo)
128 return false;
129
130 if (a->hsync_pulse_width != b->hsync_pulse_width)
131 return false;
132
133 if (a->hblank_hi != b->hblank_hi ||
134 a->hblank_lo != b->hblank_lo)
135 return false;
136
137 if (a->vactive_hi != b->vactive_hi ||
138 a->vactive_lo != b->vactive_lo)
139 return false;
140
141 if (a->vsync_off != b->vsync_off)
142 return false;
143
144 if (a->vsync_pulse_width != b->vsync_pulse_width)
145 return false;
146
147 if (a->vblank_hi != b->vblank_hi ||
148 a->vblank_lo != b->vblank_lo)
149 return false;
150
151 return true;
152}
153
154static const struct lvds_dvo_timing *
155get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
156 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
157 int index)
158{
159 /*
160 * the size of fp_timing varies on the different platform.
161 * So calculate the DVO timing relative offset in LVDS data
162 * entry to get the DVO timing entry
163 */
164
165 int lfp_data_size =
166 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
167 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
168 int dvo_timing_offset =
169 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
170 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
171 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
172
173 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
174}
175
176/* Try to find integrated panel data */
177static void
178parse_lfp_panel_data(struct drm_i915_private *dev_priv,
179 struct bdb_header *bdb)
180{
181 const struct bdb_lvds_options *lvds_options;
182 const struct bdb_lvds_lfp_data *lvds_lfp_data;
183 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
184 const struct lvds_dvo_timing *panel_dvo_timing;
185 struct drm_display_mode *panel_fixed_mode;
186 int i, downclock;
187
188 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
189 if (!lvds_options)
190 return;
191
192 dev_priv->lvds_dither = lvds_options->pixel_dither;
193 if (lvds_options->panel_type == 0xff)
194 return;
195
196 panel_type = lvds_options->panel_type;
197
198 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
199 if (!lvds_lfp_data)
200 return;
201
202 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
203 if (!lvds_lfp_data_ptrs)
204 return;
205
206 dev_priv->lvds_vbt = 1;
207
208 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
209 lvds_lfp_data_ptrs,
210 lvds_options->panel_type);
211
212 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
213 if (!panel_fixed_mode)
214 return;
215
216 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
217
218 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
219
220 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
221 drm_mode_debug_printmodeline(panel_fixed_mode);
222
223 /*
224 * Iterate over the LVDS panel timing info to find the lowest clock
225 * for the native resolution.
226 */
227 downclock = panel_dvo_timing->clock;
228 for (i = 0; i < 16; i++) {
229 const struct lvds_dvo_timing *dvo_timing;
230
231 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
232 lvds_lfp_data_ptrs,
233 i);
234 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
235 dvo_timing->clock < downclock)
236 downclock = dvo_timing->clock;
237 }
238
239 if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
240 dev_priv->lvds_downclock_avail = 1;
241 dev_priv->lvds_downclock = downclock * 10;
242 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
243 "Normal Clock %dKHz, downclock %dKHz\n",
244 panel_fixed_mode->clock, 10*downclock);
245 }
246}
247
248/* Try to find sdvo panel data */
249static void
250parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
251 struct bdb_header *bdb)
252{
253 struct lvds_dvo_timing *dvo_timing;
254 struct drm_display_mode *panel_fixed_mode;
255 int index;
256
257 index = i915_vbt_sdvo_panel_type;
258 if (index == -1) {
259 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
260
261 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
262 if (!sdvo_lvds_options)
263 return;
264
265 index = sdvo_lvds_options->panel_type;
266 }
267
268 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
269 if (!dvo_timing)
270 return;
271
272 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
273 if (!panel_fixed_mode)
274 return;
275
276 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
277
278 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
279
280 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
281 drm_mode_debug_printmodeline(panel_fixed_mode);
282}
283
284static int intel_bios_ssc_frequency(struct drm_device *dev,
285 bool alternate)
286{
287 switch (INTEL_INFO(dev)->gen) {
288 case 2:
289 return alternate ? 66 : 48;
290 case 3:
291 case 4:
292 return alternate ? 100 : 96;
293 default:
294 return alternate ? 100 : 120;
295 }
296}
297
298static void
299parse_general_features(struct drm_i915_private *dev_priv,
300 struct bdb_header *bdb)
301{
302 struct drm_device *dev = dev_priv->dev;
303 struct bdb_general_features *general;
304
305 general = find_section(bdb, BDB_GENERAL_FEATURES);
306 if (general) {
307 dev_priv->int_tv_support = general->int_tv_support;
308 dev_priv->int_crt_support = general->int_crt_support;
309 dev_priv->lvds_use_ssc = general->enable_ssc;
310 dev_priv->lvds_ssc_freq =
311 intel_bios_ssc_frequency(dev, general->ssc_freq);
312 }
313}
314
315static void
316parse_general_definitions(struct drm_i915_private *dev_priv,
317 struct bdb_header *bdb)
318{
319 struct bdb_general_definitions *general;
320
321 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
322 if (general) {
323 u16 block_size = get_blocksize(general);
324 if (block_size >= sizeof(*general)) {
325 int bus_pin = general->crt_ddc_gmbus_pin;
326 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
327 if (bus_pin >= 1 && bus_pin <= 6)
328 dev_priv->crt_ddc_pin = bus_pin;
329 } else {
330 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
331 block_size);
332 }
333 }
334}
335
336static void
337parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
338 struct bdb_header *bdb)
339{
340 struct sdvo_device_mapping *p_mapping;
341 struct bdb_general_definitions *p_defs;
342 struct child_device_config *p_child;
343 int i, child_device_num, count;
344 u16 block_size;
345
346 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
347 if (!p_defs) {
348 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
349 return;
350 }
351 /* judge whether the size of child device meets the requirements.
352 * If the child device size obtained from general definition block
353 * is different with sizeof(struct child_device_config), skip the
354 * parsing of sdvo device info
355 */
356 if (p_defs->child_dev_size != sizeof(*p_child)) {
357 /* different child dev size . Ignore it */
358 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
359 return;
360 }
361 /* get the block size of general definitions */
362 block_size = get_blocksize(p_defs);
363 /* get the number of child device */
364 child_device_num = (block_size - sizeof(*p_defs)) /
365 sizeof(*p_child);
366 count = 0;
367 for (i = 0; i < child_device_num; i++) {
368 p_child = &(p_defs->devices[i]);
369 if (!p_child->device_type) {
370 /* skip the device block if device type is invalid */
371 continue;
372 }
373 if (p_child->slave_addr != SLAVE_ADDR1 &&
374 p_child->slave_addr != SLAVE_ADDR2) {
375 /*
376 * If the slave address is neither 0x70 nor 0x72,
377 * it is not a SDVO device. Skip it.
378 */
379 continue;
380 }
381 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
382 p_child->dvo_port != DEVICE_PORT_DVOC) {
383 /* skip the incorrect SDVO port */
384 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
385 continue;
386 }
387 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
388 " %s port\n",
389 p_child->slave_addr,
390 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
391 "SDVOB" : "SDVOC");
392 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
393 if (!p_mapping->initialized) {
394 p_mapping->dvo_port = p_child->dvo_port;
395 p_mapping->slave_addr = p_child->slave_addr;
396 p_mapping->dvo_wiring = p_child->dvo_wiring;
397 p_mapping->ddc_pin = p_child->ddc_pin;
398 p_mapping->i2c_pin = p_child->i2c_pin;
399 p_mapping->i2c_speed = p_child->i2c_speed;
400 p_mapping->initialized = 1;
401 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
402 p_mapping->dvo_port,
403 p_mapping->slave_addr,
404 p_mapping->dvo_wiring,
405 p_mapping->ddc_pin,
406 p_mapping->i2c_pin,
407 p_mapping->i2c_speed);
408 } else {
409 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
410 "two SDVO device.\n");
411 }
412 if (p_child->slave2_addr) {
413 /* Maybe this is a SDVO device with multiple inputs */
414 /* And the mapping info is not added */
415 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
416 " is a SDVO device with multiple inputs.\n");
417 }
418 count++;
419 }
420
421 if (!count) {
422 /* No SDVO device info is found */
423 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
424 }
425 return;
426}
427
428static void
429parse_driver_features(struct drm_i915_private *dev_priv,
430 struct bdb_header *bdb)
431{
432 struct drm_device *dev = dev_priv->dev;
433 struct bdb_driver_features *driver;
434
435 driver = find_section(bdb, BDB_DRIVER_FEATURES);
436 if (!driver)
437 return;
438
439 if (SUPPORTS_EDP(dev) &&
440 driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
441 dev_priv->edp.support = 1;
442
443 if (driver->dual_frequency)
444 dev_priv->render_reclock_avail = true;
445}
446
447static void
448parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
449{
450 struct bdb_edp *edp;
451 struct edp_power_seq *edp_pps;
452 struct edp_link_params *edp_link_params;
453
454 edp = find_section(bdb, BDB_EDP);
455 if (!edp) {
456 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
457 DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
458 "supported, assume %dbpp panel color "
459 "depth.\n",
460 dev_priv->edp.bpp);
461 }
462 return;
463 }
464
465 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
466 case EDP_18BPP:
467 dev_priv->edp.bpp = 18;
468 break;
469 case EDP_24BPP:
470 dev_priv->edp.bpp = 24;
471 break;
472 case EDP_30BPP:
473 dev_priv->edp.bpp = 30;
474 break;
475 }
476
477 /* Get the eDP sequencing and link info */
478 edp_pps = &edp->power_seqs[panel_type];
479 edp_link_params = &edp->link_params[panel_type];
480
481 dev_priv->edp.pps = *edp_pps;
482
483 dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
484 DP_LINK_BW_1_62;
485 switch (edp_link_params->lanes) {
486 case 0:
487 dev_priv->edp.lanes = 1;
488 break;
489 case 1:
490 dev_priv->edp.lanes = 2;
491 break;
492 case 3:
493 default:
494 dev_priv->edp.lanes = 4;
495 break;
496 }
497 switch (edp_link_params->preemphasis) {
498 case 0:
499 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
500 break;
501 case 1:
502 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
503 break;
504 case 2:
505 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
506 break;
507 case 3:
508 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
509 break;
510 }
511 switch (edp_link_params->vswing) {
512 case 0:
513 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
514 break;
515 case 1:
516 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
517 break;
518 case 2:
519 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
520 break;
521 case 3:
522 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
523 break;
524 }
525}
526
527static void
528parse_device_mapping(struct drm_i915_private *dev_priv,
529 struct bdb_header *bdb)
530{
531 struct bdb_general_definitions *p_defs;
532 struct child_device_config *p_child, *child_dev_ptr;
533 int i, child_device_num, count;
534 u16 block_size;
535
536 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
537 if (!p_defs) {
538 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
539 return;
540 }
541 /* judge whether the size of child device meets the requirements.
542 * If the child device size obtained from general definition block
543 * is different with sizeof(struct child_device_config), skip the
544 * parsing of sdvo device info
545 */
546 if (p_defs->child_dev_size != sizeof(*p_child)) {
547 /* different child dev size . Ignore it */
548 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
549 return;
550 }
551 /* get the block size of general definitions */
552 block_size = get_blocksize(p_defs);
553 /* get the number of child device */
554 child_device_num = (block_size - sizeof(*p_defs)) /
555 sizeof(*p_child);
556 count = 0;
557 /* get the number of child device that is present */
558 for (i = 0; i < child_device_num; i++) {
559 p_child = &(p_defs->devices[i]);
560 if (!p_child->device_type) {
561 /* skip the device block if device type is invalid */
562 continue;
563 }
564 count++;
565 }
566 if (!count) {
567 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
568 return;
569 }
570 dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
571 if (!dev_priv->child_dev) {
572 DRM_DEBUG_KMS("No memory space for child device\n");
573 return;
574 }
575
576 dev_priv->child_dev_num = count;
577 count = 0;
578 for (i = 0; i < child_device_num; i++) {
579 p_child = &(p_defs->devices[i]);
580 if (!p_child->device_type) {
581 /* skip the device block if device type is invalid */
582 continue;
583 }
584 child_dev_ptr = dev_priv->child_dev + count;
585 count++;
586 memcpy((void *)child_dev_ptr, (void *)p_child,
587 sizeof(*p_child));
588 }
589 return;
590}
591
592static void
593init_vbt_defaults(struct drm_i915_private *dev_priv)
594{
595 struct drm_device *dev = dev_priv->dev;
596
597 dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
598
599 /* LFP panel data */
600 dev_priv->lvds_dither = 1;
601 dev_priv->lvds_vbt = 0;
602
603 /* SDVO panel data */
604 dev_priv->sdvo_lvds_vbt_mode = NULL;
605
606 /* general features */
607 dev_priv->int_tv_support = 1;
608 dev_priv->int_crt_support = 1;
609
610 /* Default to using SSC */
611 dev_priv->lvds_use_ssc = 1;
612 dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
613 DRM_DEBUG("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
614
615 /* eDP data */
616 dev_priv->edp.bpp = 18;
617}
618
619/**
620 * intel_parse_bios - find VBT and initialize settings from the BIOS
621 * @dev: DRM device
622 *
623 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
624 * to appropriate values.
625 *
626 * Returns 0 on success, nonzero on failure.
627 */
628bool
629intel_parse_bios(struct drm_device *dev)
630{
631 struct drm_i915_private *dev_priv = dev->dev_private;
632 struct pci_dev *pdev = dev->pdev;
633 struct bdb_header *bdb = NULL;
634 u8 __iomem *bios = NULL;
635
636 init_vbt_defaults(dev_priv);
637
638 /* XXX Should this validation be moved to intel_opregion.c? */
639 if (dev_priv->opregion.vbt) {
640 struct vbt_header *vbt = dev_priv->opregion.vbt;
641 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
642 DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
643 vbt->signature);
644 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
645 } else
646 dev_priv->opregion.vbt = NULL;
647 }
648
649 if (bdb == NULL) {
650 struct vbt_header *vbt = NULL;
651 size_t size;
652 int i;
653
654 bios = pci_map_rom(pdev, &size);
655 if (!bios)
656 return -1;
657
658 /* Scour memory looking for the VBT signature */
659 for (i = 0; i + 4 < size; i++) {
660 if (!memcmp(bios + i, "$VBT", 4)) {
661 vbt = (struct vbt_header *)(bios + i);
662 break;
663 }
664 }
665
666 if (!vbt) {
667 DRM_ERROR("VBT signature missing\n");
668 pci_unmap_rom(pdev, bios);
669 return -1;
670 }
671
672 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
673 }
674
675 /* Grab useful general definitions */
676 parse_general_features(dev_priv, bdb);
677 parse_general_definitions(dev_priv, bdb);
678 parse_lfp_panel_data(dev_priv, bdb);
679 parse_sdvo_panel_data(dev_priv, bdb);
680 parse_sdvo_device_mapping(dev_priv, bdb);
681 parse_device_mapping(dev_priv, bdb);
682 parse_driver_features(dev_priv, bdb);
683 parse_edp(dev_priv, bdb);
684
685 if (bios)
686 pci_unmap_rom(pdev, bios);
687
688 return 0;
689}
690
691/* Ensure that vital registers have been initialised, even if the BIOS
692 * is absent or just failing to do its job.
693 */
694void intel_setup_bios(struct drm_device *dev)
695{
696 struct drm_i915_private *dev_priv = dev->dev_private;
697
698 /* Set the Panel Power On/Off timings if uninitialized. */
699 if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
700 /* Set T2 to 40ms and T5 to 200ms */
701 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
702
703 /* Set T3 to 35ms and Tx to 200ms */
704 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
705 }
706}
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
38static int panel_type;
39
40static void *
41find_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
66static u16
67get_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
76static void
77fill_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
119static bool
120lvds_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
155static const struct lvds_dvo_timing *
156get_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 */
180static const struct lvds_fp_timing *
181get_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 */
200static void
201parse_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 */
286static void
287parse_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 == -2) {
296 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
297 return;
298 }
299
300 if (index == -1) {
301 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
302
303 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
304 if (!sdvo_lvds_options)
305 return;
306
307 index = sdvo_lvds_options->panel_type;
308 }
309
310 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
311 if (!dvo_timing)
312 return;
313
314 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
315 if (!panel_fixed_mode)
316 return;
317
318 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
319
320 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
321
322 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
323 drm_mode_debug_printmodeline(panel_fixed_mode);
324}
325
326static int intel_bios_ssc_frequency(struct drm_device *dev,
327 bool alternate)
328{
329 switch (INTEL_INFO(dev)->gen) {
330 case 2:
331 return alternate ? 66 : 48;
332 case 3:
333 case 4:
334 return alternate ? 100 : 96;
335 default:
336 return alternate ? 100 : 120;
337 }
338}
339
340static void
341parse_general_features(struct drm_i915_private *dev_priv,
342 struct bdb_header *bdb)
343{
344 struct drm_device *dev = dev_priv->dev;
345 struct bdb_general_features *general;
346
347 general = find_section(bdb, BDB_GENERAL_FEATURES);
348 if (general) {
349 dev_priv->int_tv_support = general->int_tv_support;
350 dev_priv->int_crt_support = general->int_crt_support;
351 dev_priv->lvds_use_ssc = general->enable_ssc;
352 dev_priv->lvds_ssc_freq =
353 intel_bios_ssc_frequency(dev, general->ssc_freq);
354 dev_priv->display_clock_mode = general->display_clock_mode;
355 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",
356 dev_priv->int_tv_support,
357 dev_priv->int_crt_support,
358 dev_priv->lvds_use_ssc,
359 dev_priv->lvds_ssc_freq,
360 dev_priv->display_clock_mode);
361 }
362}
363
364static void
365parse_general_definitions(struct drm_i915_private *dev_priv,
366 struct bdb_header *bdb)
367{
368 struct bdb_general_definitions *general;
369
370 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
371 if (general) {
372 u16 block_size = get_blocksize(general);
373 if (block_size >= sizeof(*general)) {
374 int bus_pin = general->crt_ddc_gmbus_pin;
375 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
376 if (intel_gmbus_is_port_valid(bus_pin))
377 dev_priv->crt_ddc_pin = bus_pin;
378 } else {
379 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
380 block_size);
381 }
382 }
383}
384
385static void
386parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
387 struct bdb_header *bdb)
388{
389 struct sdvo_device_mapping *p_mapping;
390 struct bdb_general_definitions *p_defs;
391 struct child_device_config *p_child;
392 int i, child_device_num, count;
393 u16 block_size;
394
395 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
396 if (!p_defs) {
397 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
398 return;
399 }
400 /* judge whether the size of child device meets the requirements.
401 * If the child device size obtained from general definition block
402 * is different with sizeof(struct child_device_config), skip the
403 * parsing of sdvo device info
404 */
405 if (p_defs->child_dev_size != sizeof(*p_child)) {
406 /* different child dev size . Ignore it */
407 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
408 return;
409 }
410 /* get the block size of general definitions */
411 block_size = get_blocksize(p_defs);
412 /* get the number of child device */
413 child_device_num = (block_size - sizeof(*p_defs)) /
414 sizeof(*p_child);
415 count = 0;
416 for (i = 0; i < child_device_num; i++) {
417 p_child = &(p_defs->devices[i]);
418 if (!p_child->device_type) {
419 /* skip the device block if device type is invalid */
420 continue;
421 }
422 if (p_child->slave_addr != SLAVE_ADDR1 &&
423 p_child->slave_addr != SLAVE_ADDR2) {
424 /*
425 * If the slave address is neither 0x70 nor 0x72,
426 * it is not a SDVO device. Skip it.
427 */
428 continue;
429 }
430 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
431 p_child->dvo_port != DEVICE_PORT_DVOC) {
432 /* skip the incorrect SDVO port */
433 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
434 continue;
435 }
436 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
437 " %s port\n",
438 p_child->slave_addr,
439 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
440 "SDVOB" : "SDVOC");
441 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
442 if (!p_mapping->initialized) {
443 p_mapping->dvo_port = p_child->dvo_port;
444 p_mapping->slave_addr = p_child->slave_addr;
445 p_mapping->dvo_wiring = p_child->dvo_wiring;
446 p_mapping->ddc_pin = p_child->ddc_pin;
447 p_mapping->i2c_pin = p_child->i2c_pin;
448 p_mapping->initialized = 1;
449 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
450 p_mapping->dvo_port,
451 p_mapping->slave_addr,
452 p_mapping->dvo_wiring,
453 p_mapping->ddc_pin,
454 p_mapping->i2c_pin);
455 } else {
456 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
457 "two SDVO device.\n");
458 }
459 if (p_child->slave2_addr) {
460 /* Maybe this is a SDVO device with multiple inputs */
461 /* And the mapping info is not added */
462 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
463 " is a SDVO device with multiple inputs.\n");
464 }
465 count++;
466 }
467
468 if (!count) {
469 /* No SDVO device info is found */
470 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
471 }
472 return;
473}
474
475static void
476parse_driver_features(struct drm_i915_private *dev_priv,
477 struct bdb_header *bdb)
478{
479 struct drm_device *dev = dev_priv->dev;
480 struct bdb_driver_features *driver;
481
482 driver = find_section(bdb, BDB_DRIVER_FEATURES);
483 if (!driver)
484 return;
485
486 if (SUPPORTS_EDP(dev) &&
487 driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
488 dev_priv->edp.support = 1;
489
490 if (driver->dual_frequency)
491 dev_priv->render_reclock_avail = true;
492}
493
494static void
495parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
496{
497 struct bdb_edp *edp;
498 struct edp_power_seq *edp_pps;
499 struct edp_link_params *edp_link_params;
500
501 edp = find_section(bdb, BDB_EDP);
502 if (!edp) {
503 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
504 DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
505 "supported, assume %dbpp panel color "
506 "depth.\n",
507 dev_priv->edp.bpp);
508 }
509 return;
510 }
511
512 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
513 case EDP_18BPP:
514 dev_priv->edp.bpp = 18;
515 break;
516 case EDP_24BPP:
517 dev_priv->edp.bpp = 24;
518 break;
519 case EDP_30BPP:
520 dev_priv->edp.bpp = 30;
521 break;
522 }
523
524 /* Get the eDP sequencing and link info */
525 edp_pps = &edp->power_seqs[panel_type];
526 edp_link_params = &edp->link_params[panel_type];
527
528 dev_priv->edp.pps = *edp_pps;
529
530 dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
531 DP_LINK_BW_1_62;
532 switch (edp_link_params->lanes) {
533 case 0:
534 dev_priv->edp.lanes = 1;
535 break;
536 case 1:
537 dev_priv->edp.lanes = 2;
538 break;
539 case 3:
540 default:
541 dev_priv->edp.lanes = 4;
542 break;
543 }
544 switch (edp_link_params->preemphasis) {
545 case 0:
546 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
547 break;
548 case 1:
549 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
550 break;
551 case 2:
552 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
553 break;
554 case 3:
555 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
556 break;
557 }
558 switch (edp_link_params->vswing) {
559 case 0:
560 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
561 break;
562 case 1:
563 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
564 break;
565 case 2:
566 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
567 break;
568 case 3:
569 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
570 break;
571 }
572}
573
574static void
575parse_device_mapping(struct drm_i915_private *dev_priv,
576 struct bdb_header *bdb)
577{
578 struct bdb_general_definitions *p_defs;
579 struct child_device_config *p_child, *child_dev_ptr;
580 int i, child_device_num, count;
581 u16 block_size;
582
583 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
584 if (!p_defs) {
585 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
586 return;
587 }
588 /* judge whether the size of child device meets the requirements.
589 * If the child device size obtained from general definition block
590 * is different with sizeof(struct child_device_config), skip the
591 * parsing of sdvo device info
592 */
593 if (p_defs->child_dev_size != sizeof(*p_child)) {
594 /* different child dev size . Ignore it */
595 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
596 return;
597 }
598 /* get the block size of general definitions */
599 block_size = get_blocksize(p_defs);
600 /* get the number of child device */
601 child_device_num = (block_size - sizeof(*p_defs)) /
602 sizeof(*p_child);
603 count = 0;
604 /* get the number of child device that is present */
605 for (i = 0; i < child_device_num; i++) {
606 p_child = &(p_defs->devices[i]);
607 if (!p_child->device_type) {
608 /* skip the device block if device type is invalid */
609 continue;
610 }
611 count++;
612 }
613 if (!count) {
614 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
615 return;
616 }
617 dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
618 if (!dev_priv->child_dev) {
619 DRM_DEBUG_KMS("No memory space for child device\n");
620 return;
621 }
622
623 dev_priv->child_dev_num = count;
624 count = 0;
625 for (i = 0; i < child_device_num; i++) {
626 p_child = &(p_defs->devices[i]);
627 if (!p_child->device_type) {
628 /* skip the device block if device type is invalid */
629 continue;
630 }
631 child_dev_ptr = dev_priv->child_dev + count;
632 count++;
633 memcpy((void *)child_dev_ptr, (void *)p_child,
634 sizeof(*p_child));
635 }
636 return;
637}
638
639static void
640init_vbt_defaults(struct drm_i915_private *dev_priv)
641{
642 struct drm_device *dev = dev_priv->dev;
643
644 dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
645
646 /* LFP panel data */
647 dev_priv->lvds_dither = 1;
648 dev_priv->lvds_vbt = 0;
649
650 /* SDVO panel data */
651 dev_priv->sdvo_lvds_vbt_mode = NULL;
652
653 /* general features */
654 dev_priv->int_tv_support = 1;
655 dev_priv->int_crt_support = 1;
656
657 /* Default to using SSC */
658 dev_priv->lvds_use_ssc = 1;
659 dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
660 DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
661
662 /* eDP data */
663 dev_priv->edp.bpp = 18;
664}
665
666static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
667{
668 DRM_DEBUG_KMS("Falling back to manually reading VBT from "
669 "VBIOS ROM for %s\n",
670 id->ident);
671 return 1;
672}
673
674static const struct dmi_system_id intel_no_opregion_vbt[] = {
675 {
676 .callback = intel_no_opregion_vbt_callback,
677 .ident = "ThinkCentre A57",
678 .matches = {
679 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
680 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
681 },
682 },
683 { }
684};
685
686/**
687 * intel_parse_bios - find VBT and initialize settings from the BIOS
688 * @dev: DRM device
689 *
690 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
691 * to appropriate values.
692 *
693 * Returns 0 on success, nonzero on failure.
694 */
695bool
696intel_parse_bios(struct drm_device *dev)
697{
698 struct drm_i915_private *dev_priv = dev->dev_private;
699 struct pci_dev *pdev = dev->pdev;
700 struct bdb_header *bdb = NULL;
701 u8 __iomem *bios = NULL;
702
703 init_vbt_defaults(dev_priv);
704
705 /* XXX Should this validation be moved to intel_opregion.c? */
706 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
707 struct vbt_header *vbt = dev_priv->opregion.vbt;
708 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
709 DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
710 vbt->signature);
711 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
712 } else
713 dev_priv->opregion.vbt = NULL;
714 }
715
716 if (bdb == NULL) {
717 struct vbt_header *vbt = NULL;
718 size_t size;
719 int i;
720
721 bios = pci_map_rom(pdev, &size);
722 if (!bios)
723 return -1;
724
725 /* Scour memory looking for the VBT signature */
726 for (i = 0; i + 4 < size; i++) {
727 if (!memcmp(bios + i, "$VBT", 4)) {
728 vbt = (struct vbt_header *)(bios + i);
729 break;
730 }
731 }
732
733 if (!vbt) {
734 DRM_DEBUG_DRIVER("VBT signature missing\n");
735 pci_unmap_rom(pdev, bios);
736 return -1;
737 }
738
739 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
740 }
741
742 /* Grab useful general definitions */
743 parse_general_features(dev_priv, bdb);
744 parse_general_definitions(dev_priv, bdb);
745 parse_lfp_panel_data(dev_priv, bdb);
746 parse_sdvo_panel_data(dev_priv, bdb);
747 parse_sdvo_device_mapping(dev_priv, bdb);
748 parse_device_mapping(dev_priv, bdb);
749 parse_driver_features(dev_priv, bdb);
750 parse_edp(dev_priv, bdb);
751
752 if (bios)
753 pci_unmap_rom(pdev, bios);
754
755 return 0;
756}
757
758/* Ensure that vital registers have been initialised, even if the BIOS
759 * is absent or just failing to do its job.
760 */
761void intel_setup_bios(struct drm_device *dev)
762{
763 struct drm_i915_private *dev_priv = dev->dev_private;
764
765 /* Set the Panel Power On/Off timings if uninitialized. */
766 if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
767 /* Set T2 to 40ms and T5 to 200ms */
768 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
769
770 /* Set T3 to 35ms and Tx to 200ms */
771 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
772 }
773}