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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / gpu / drm / i915 / intel_bios.c
blob63880e2e5cfd4c2028f9933081606b57e2d5380f
1 /*
2 * Copyright © 2006 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27 #include <drm/drm_dp_helper.h>
28 #include "drmP.h"
29 #include "drm.h"
30 #include "i915_drm.h"
31 #include "i915_drv.h"
32 #include "intel_bios.h"
33
34 #define SLAVE_ADDR1 0x70
35 #define SLAVE_ADDR2 0x72
36
37 static int panel_type;
38
39 static void *
40 find_section(struct bdb_header *bdb, int section_id)
41 {
42 u8 *base = (u8 *)bdb;
43 int index = 0;
44 u16 total, current_size;
45 u8 current_id;
46
47 /* skip to first section */
48 index += bdb->header_size;
49 total = bdb->bdb_size;
50
51 /* walk the sections looking for section_id */
52 while (index < total) {
53 current_id = *(base + index);
54 index++;
55 current_size = *((u16 *)(base + index));
56 index += 2;
57 if (current_id == section_id)
58 return base + index;
59 index += current_size;
60 }
61
62 return NULL;
63 }
64
65 static u16
66 get_blocksize(void *p)
67 {
68 u16 *block_ptr, block_size;
69
70 block_ptr = (u16 *)((char *)p - 2);
71 block_size = *block_ptr;
72 return block_size;
73 }
74
75 static void
76 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
77 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
118 static bool
119 lvds_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
154 static const struct lvds_dvo_timing *
155 get_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 */
177 static void
178 parse_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 */
249 static void
250 parse_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
284 static 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
298 static void
299 parse_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 dev_priv->display_clock_mode = general->display_clock_mode;
313 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",
314 dev_priv->int_tv_support,
315 dev_priv->int_crt_support,
316 dev_priv->lvds_use_ssc,
317 dev_priv->lvds_ssc_freq,
318 dev_priv->display_clock_mode);
319 }
320 }
321
322 static void
323 parse_general_definitions(struct drm_i915_private *dev_priv,
324 struct bdb_header *bdb)
325 {
326 struct bdb_general_definitions *general;
327
328 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
329 if (general) {
330 u16 block_size = get_blocksize(general);
331 if (block_size >= sizeof(*general)) {
332 int bus_pin = general->crt_ddc_gmbus_pin;
333 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
334 if (bus_pin >= 1 && bus_pin <= 6)
335 dev_priv->crt_ddc_pin = bus_pin;
336 } else {
337 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
338 block_size);
339 }
340 }
341 }
342
343 static void
344 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
345 struct bdb_header *bdb)
346 {
347 struct sdvo_device_mapping *p_mapping;
348 struct bdb_general_definitions *p_defs;
349 struct child_device_config *p_child;
350 int i, child_device_num, count;
351 u16 block_size;
352
353 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
354 if (!p_defs) {
355 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
356 return;
357 }
358 /* judge whether the size of child device meets the requirements.
359 * If the child device size obtained from general definition block
360 * is different with sizeof(struct child_device_config), skip the
361 * parsing of sdvo device info
362 */
363 if (p_defs->child_dev_size != sizeof(*p_child)) {
364 /* different child dev size . Ignore it */
365 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
366 return;
367 }
368 /* get the block size of general definitions */
369 block_size = get_blocksize(p_defs);
370 /* get the number of child device */
371 child_device_num = (block_size - sizeof(*p_defs)) /
372 sizeof(*p_child);
373 count = 0;
374 for (i = 0; i < child_device_num; i++) {
375 p_child = &(p_defs->devices[i]);
376 if (!p_child->device_type) {
377 /* skip the device block if device type is invalid */
378 continue;
379 }
380 if (p_child->slave_addr != SLAVE_ADDR1 &&
381 p_child->slave_addr != SLAVE_ADDR2) {
382 /*
383 * If the slave address is neither 0x70 nor 0x72,
384 * it is not a SDVO device. Skip it.
385 */
386 continue;
387 }
388 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
389 p_child->dvo_port != DEVICE_PORT_DVOC) {
390 /* skip the incorrect SDVO port */
391 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
392 continue;
393 }
394 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
395 " %s port\n",
396 p_child->slave_addr,
397 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
398 "SDVOB" : "SDVOC");
399 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
400 if (!p_mapping->initialized) {
401 p_mapping->dvo_port = p_child->dvo_port;
402 p_mapping->slave_addr = p_child->slave_addr;
403 p_mapping->dvo_wiring = p_child->dvo_wiring;
404 p_mapping->ddc_pin = p_child->ddc_pin;
405 p_mapping->i2c_pin = p_child->i2c_pin;
406 p_mapping->initialized = 1;
407 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
408 p_mapping->dvo_port,
409 p_mapping->slave_addr,
410 p_mapping->dvo_wiring,
411 p_mapping->ddc_pin,
412 p_mapping->i2c_pin);
413 } else {
414 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
415 "two SDVO device.\n");
416 }
417 if (p_child->slave2_addr) {
418 /* Maybe this is a SDVO device with multiple inputs */
419 /* And the mapping info is not added */
420 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
421 " is a SDVO device with multiple inputs.\n");
422 }
423 count++;
424 }
425
426 if (!count) {
427 /* No SDVO device info is found */
428 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
429 }
430 return;
431 }
432
433 static void
434 parse_driver_features(struct drm_i915_private *dev_priv,
435 struct bdb_header *bdb)
436 {
437 struct drm_device *dev = dev_priv->dev;
438 struct bdb_driver_features *driver;
439
440 driver = find_section(bdb, BDB_DRIVER_FEATURES);
441 if (!driver)
442 return;
443
444 if (SUPPORTS_EDP(dev) &&
445 driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
446 dev_priv->edp.support = 1;
447
448 if (driver->dual_frequency)
449 dev_priv->render_reclock_avail = true;
450 }
451
452 static void
453 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
454 {
455 struct bdb_edp *edp;
456 struct edp_power_seq *edp_pps;
457 struct edp_link_params *edp_link_params;
458
459 edp = find_section(bdb, BDB_EDP);
460 if (!edp) {
461 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
462 DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
463 "supported, assume %dbpp panel color "
464 "depth.\n",
465 dev_priv->edp.bpp);
466 }
467 return;
468 }
469
470 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
471 case EDP_18BPP:
472 dev_priv->edp.bpp = 18;
473 break;
474 case EDP_24BPP:
475 dev_priv->edp.bpp = 24;
476 break;
477 case EDP_30BPP:
478 dev_priv->edp.bpp = 30;
479 break;
480 }
481
482 /* Get the eDP sequencing and link info */
483 edp_pps = &edp->power_seqs[panel_type];
484 edp_link_params = &edp->link_params[panel_type];
485
486 dev_priv->edp.pps = *edp_pps;
487
488 dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
489 DP_LINK_BW_1_62;
490 switch (edp_link_params->lanes) {
491 case 0:
492 dev_priv->edp.lanes = 1;
493 break;
494 case 1:
495 dev_priv->edp.lanes = 2;
496 break;
497 case 3:
498 default:
499 dev_priv->edp.lanes = 4;
500 break;
501 }
502 switch (edp_link_params->preemphasis) {
503 case 0:
504 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
505 break;
506 case 1:
507 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
508 break;
509 case 2:
510 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
511 break;
512 case 3:
513 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
514 break;
515 }
516 switch (edp_link_params->vswing) {
517 case 0:
518 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
519 break;
520 case 1:
521 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
522 break;
523 case 2:
524 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
525 break;
526 case 3:
527 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
528 break;
529 }
530 }
531
532 static void
533 parse_device_mapping(struct drm_i915_private *dev_priv,
534 struct bdb_header *bdb)
535 {
536 struct bdb_general_definitions *p_defs;
537 struct child_device_config *p_child, *child_dev_ptr;
538 int i, child_device_num, count;
539 u16 block_size;
540
541 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
542 if (!p_defs) {
543 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
544 return;
545 }
546 /* judge whether the size of child device meets the requirements.
547 * If the child device size obtained from general definition block
548 * is different with sizeof(struct child_device_config), skip the
549 * parsing of sdvo device info
550 */
551 if (p_defs->child_dev_size != sizeof(*p_child)) {
552 /* different child dev size . Ignore it */
553 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
554 return;
555 }
556 /* get the block size of general definitions */
557 block_size = get_blocksize(p_defs);
558 /* get the number of child device */
559 child_device_num = (block_size - sizeof(*p_defs)) /
560 sizeof(*p_child);
561 count = 0;
562 /* get the number of child device that is present */
563 for (i = 0; i < child_device_num; i++) {
564 p_child = &(p_defs->devices[i]);
565 if (!p_child->device_type) {
566 /* skip the device block if device type is invalid */
567 continue;
568 }
569 count++;
570 }
571 if (!count) {
572 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
573 return;
574 }
575 dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
576 if (!dev_priv->child_dev) {
577 DRM_DEBUG_KMS("No memory space for child device\n");
578 return;
579 }
580
581 dev_priv->child_dev_num = count;
582 count = 0;
583 for (i = 0; i < child_device_num; i++) {
584 p_child = &(p_defs->devices[i]);
585 if (!p_child->device_type) {
586 /* skip the device block if device type is invalid */
587 continue;
588 }
589 child_dev_ptr = dev_priv->child_dev + count;
590 count++;
591 memcpy((void *)child_dev_ptr, (void *)p_child,
592 sizeof(*p_child));
593 }
594 return;
595 }
596
597 static void
598 init_vbt_defaults(struct drm_i915_private *dev_priv)
599 {
600 struct drm_device *dev = dev_priv->dev;
601
602 dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
603
604 /* LFP panel data */
605 dev_priv->lvds_dither = 1;
606 dev_priv->lvds_vbt = 0;
607
608 /* SDVO panel data */
609 dev_priv->sdvo_lvds_vbt_mode = NULL;
610
611 /* general features */
612 dev_priv->int_tv_support = 1;
613 dev_priv->int_crt_support = 1;
614
615 /* Default to using SSC */
616 dev_priv->lvds_use_ssc = 1;
617 dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
618 DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
619
620 /* eDP data */
621 dev_priv->edp.bpp = 18;
622 }
623
624 /**
625 * intel_parse_bios - find VBT and initialize settings from the BIOS
626 * @dev: DRM device
627 *
628 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
629 * to appropriate values.
630 *
631 * Returns 0 on success, nonzero on failure.
632 */
633 bool
634 intel_parse_bios(struct drm_device *dev)
635 {
636 struct drm_i915_private *dev_priv = dev->dev_private;
637 struct pci_dev *pdev = dev->pdev;
638 struct bdb_header *bdb = NULL;
639 u8 __iomem *bios = NULL;
640
641 init_vbt_defaults(dev_priv);
642
643 /* XXX Should this validation be moved to intel_opregion.c? */
644 if (dev_priv->opregion.vbt) {
645 struct vbt_header *vbt = dev_priv->opregion.vbt;
646 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
647 DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
648 vbt->signature);
649 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
650 } else
651 dev_priv->opregion.vbt = NULL;
652 }
653
654 if (bdb == NULL) {
655 struct vbt_header *vbt = NULL;
656 size_t size;
657 int i;
658
659 bios = pci_map_rom(pdev, &size);
660 if (!bios)
661 return -1;
662
663 /* Scour memory looking for the VBT signature */
664 for (i = 0; i + 4 < size; i++) {
665 if (!memcmp(bios + i, "$VBT", 4)) {
666 vbt = (struct vbt_header *)(bios + i);
667 break;
668 }
669 }
670
671 if (!vbt) {
672 DRM_ERROR("VBT signature missing\n");
673 pci_unmap_rom(pdev, bios);
674 return -1;
675 }
676
677 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
678 }
679
680 /* Grab useful general definitions */
681 parse_general_features(dev_priv, bdb);
682 parse_general_definitions(dev_priv, bdb);
683 parse_lfp_panel_data(dev_priv, bdb);
684 parse_sdvo_panel_data(dev_priv, bdb);
685 parse_sdvo_device_mapping(dev_priv, bdb);
686 parse_device_mapping(dev_priv, bdb);
687 parse_driver_features(dev_priv, bdb);
688 parse_edp(dev_priv, bdb);
689
690 if (bios)
691 pci_unmap_rom(pdev, bios);
692
693 return 0;
694 }
695
696 /* Ensure that vital registers have been initialised, even if the BIOS
697 * is absent or just failing to do its job.
698 */
699 void intel_setup_bios(struct drm_device *dev)
700 {
701 struct drm_i915_private *dev_priv = dev->dev_private;
702
703 /* Set the Panel Power On/Off timings if uninitialized. */
704 if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
705 /* Set T2 to 40ms and T5 to 200ms */
706 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
707
708 /* Set T3 to 35ms and Tx to 200ms */
709 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
710 }
711 }
Mirror of the linux-mips.org kernel tree