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drm/i915: base gmbus pin validity check on the gmbus pin map array
[deliverable/linux.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 <drm/drmP.h>
30 #include <drm/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 + 3 < total) {
53 current_id = *(base + index);
54 index++;
55
56 current_size = *((u16 *)(base + index));
57 index += 2;
58
59 if (index + current_size > total)
60 return NULL;
61
62 if (current_id == section_id)
63 return base + index;
64
65 index += current_size;
66 }
67
68 return NULL;
69 }
70
71 static u16
72 get_blocksize(void *p)
73 {
74 u16 *block_ptr, block_size;
75
76 block_ptr = (u16 *)((char *)p - 2);
77 block_size = *block_ptr;
78 return block_size;
79 }
80
81 static void
82 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
83 const struct lvds_dvo_timing *dvo_timing)
84 {
85 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
86 dvo_timing->hactive_lo;
87 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
88 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
89 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
90 dvo_timing->hsync_pulse_width;
91 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
92 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
93
94 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
95 dvo_timing->vactive_lo;
96 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
97 dvo_timing->vsync_off;
98 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
99 dvo_timing->vsync_pulse_width;
100 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
101 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
102 panel_fixed_mode->clock = dvo_timing->clock * 10;
103 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
104
105 if (dvo_timing->hsync_positive)
106 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
107 else
108 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
109
110 if (dvo_timing->vsync_positive)
111 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
112 else
113 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
114
115 /* Some VBTs have bogus h/vtotal values */
116 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
117 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
118 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
119 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
120
121 drm_mode_set_name(panel_fixed_mode);
122 }
123
124 static bool
125 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
126 const struct lvds_dvo_timing *b)
127 {
128 if (a->hactive_hi != b->hactive_hi ||
129 a->hactive_lo != b->hactive_lo)
130 return false;
131
132 if (a->hsync_off_hi != b->hsync_off_hi ||
133 a->hsync_off_lo != b->hsync_off_lo)
134 return false;
135
136 if (a->hsync_pulse_width != b->hsync_pulse_width)
137 return false;
138
139 if (a->hblank_hi != b->hblank_hi ||
140 a->hblank_lo != b->hblank_lo)
141 return false;
142
143 if (a->vactive_hi != b->vactive_hi ||
144 a->vactive_lo != b->vactive_lo)
145 return false;
146
147 if (a->vsync_off != b->vsync_off)
148 return false;
149
150 if (a->vsync_pulse_width != b->vsync_pulse_width)
151 return false;
152
153 if (a->vblank_hi != b->vblank_hi ||
154 a->vblank_lo != b->vblank_lo)
155 return false;
156
157 return true;
158 }
159
160 static const struct lvds_dvo_timing *
161 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
162 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
163 int index)
164 {
165 /*
166 * the size of fp_timing varies on the different platform.
167 * So calculate the DVO timing relative offset in LVDS data
168 * entry to get the DVO timing entry
169 */
170
171 int lfp_data_size =
172 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
173 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
174 int dvo_timing_offset =
175 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
176 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
177 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
178
179 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
180 }
181
182 /* get lvds_fp_timing entry
183 * this function may return NULL if the corresponding entry is invalid
184 */
185 static const struct lvds_fp_timing *
186 get_lvds_fp_timing(const struct bdb_header *bdb,
187 const struct bdb_lvds_lfp_data *data,
188 const struct bdb_lvds_lfp_data_ptrs *ptrs,
189 int index)
190 {
191 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
192 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
193 size_t ofs;
194
195 if (index >= ARRAY_SIZE(ptrs->ptr))
196 return NULL;
197 ofs = ptrs->ptr[index].fp_timing_offset;
198 if (ofs < data_ofs ||
199 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
200 return NULL;
201 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
202 }
203
204 /* Try to find integrated panel data */
205 static void
206 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
207 struct bdb_header *bdb)
208 {
209 const struct bdb_lvds_options *lvds_options;
210 const struct bdb_lvds_lfp_data *lvds_lfp_data;
211 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
212 const struct lvds_dvo_timing *panel_dvo_timing;
213 const struct lvds_fp_timing *fp_timing;
214 struct drm_display_mode *panel_fixed_mode;
215 int i, downclock, drrs_mode;
216
217 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
218 if (!lvds_options)
219 return;
220
221 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
222 if (lvds_options->panel_type == 0xff)
223 return;
224
225 panel_type = lvds_options->panel_type;
226
227 drrs_mode = (lvds_options->dps_panel_type_bits
228 >> (panel_type * 2)) & MODE_MASK;
229 /*
230 * VBT has static DRRS = 0 and seamless DRRS = 2.
231 * The below piece of code is required to adjust vbt.drrs_type
232 * to match the enum drrs_support_type.
233 */
234 switch (drrs_mode) {
235 case 0:
236 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
237 DRM_DEBUG_KMS("DRRS supported mode is static\n");
238 break;
239 case 2:
240 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
241 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
242 break;
243 default:
244 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
245 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
246 break;
247 }
248
249 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
250 if (!lvds_lfp_data)
251 return;
252
253 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
254 if (!lvds_lfp_data_ptrs)
255 return;
256
257 dev_priv->vbt.lvds_vbt = 1;
258
259 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
260 lvds_lfp_data_ptrs,
261 lvds_options->panel_type);
262
263 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
264 if (!panel_fixed_mode)
265 return;
266
267 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
268
269 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
270
271 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
272 drm_mode_debug_printmodeline(panel_fixed_mode);
273
274 /*
275 * Iterate over the LVDS panel timing info to find the lowest clock
276 * for the native resolution.
277 */
278 downclock = panel_dvo_timing->clock;
279 for (i = 0; i < 16; i++) {
280 const struct lvds_dvo_timing *dvo_timing;
281
282 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
283 lvds_lfp_data_ptrs,
284 i);
285 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
286 dvo_timing->clock < downclock)
287 downclock = dvo_timing->clock;
288 }
289
290 if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) {
291 dev_priv->lvds_downclock_avail = 1;
292 dev_priv->lvds_downclock = downclock * 10;
293 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
294 "Normal Clock %dKHz, downclock %dKHz\n",
295 panel_fixed_mode->clock, 10*downclock);
296 }
297
298 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
299 lvds_lfp_data_ptrs,
300 lvds_options->panel_type);
301 if (fp_timing) {
302 /* check the resolution, just to be sure */
303 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
304 fp_timing->y_res == panel_fixed_mode->vdisplay) {
305 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
306 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
307 dev_priv->vbt.bios_lvds_val);
308 }
309 }
310 }
311
312 static void
313 parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
314 {
315 const struct bdb_lfp_backlight_data *backlight_data;
316 const struct bdb_lfp_backlight_data_entry *entry;
317
318 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
319 if (!backlight_data)
320 return;
321
322 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
323 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
324 backlight_data->entry_size);
325 return;
326 }
327
328 entry = &backlight_data->data[panel_type];
329
330 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
331 if (!dev_priv->vbt.backlight.present) {
332 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
333 entry->type);
334 return;
335 }
336
337 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
338 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
339 dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
340 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
341 "active %s, min brightness %u, level %u\n",
342 dev_priv->vbt.backlight.pwm_freq_hz,
343 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
344 dev_priv->vbt.backlight.min_brightness,
345 backlight_data->level[panel_type]);
346 }
347
348 /* Try to find sdvo panel data */
349 static void
350 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
351 struct bdb_header *bdb)
352 {
353 struct lvds_dvo_timing *dvo_timing;
354 struct drm_display_mode *panel_fixed_mode;
355 int index;
356
357 index = i915.vbt_sdvo_panel_type;
358 if (index == -2) {
359 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
360 return;
361 }
362
363 if (index == -1) {
364 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
365
366 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
367 if (!sdvo_lvds_options)
368 return;
369
370 index = sdvo_lvds_options->panel_type;
371 }
372
373 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
374 if (!dvo_timing)
375 return;
376
377 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
378 if (!panel_fixed_mode)
379 return;
380
381 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
382
383 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
384
385 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
386 drm_mode_debug_printmodeline(panel_fixed_mode);
387 }
388
389 static int intel_bios_ssc_frequency(struct drm_device *dev,
390 bool alternate)
391 {
392 switch (INTEL_INFO(dev)->gen) {
393 case 2:
394 return alternate ? 66667 : 48000;
395 case 3:
396 case 4:
397 return alternate ? 100000 : 96000;
398 default:
399 return alternate ? 100000 : 120000;
400 }
401 }
402
403 static void
404 parse_general_features(struct drm_i915_private *dev_priv,
405 struct bdb_header *bdb)
406 {
407 struct drm_device *dev = dev_priv->dev;
408 struct bdb_general_features *general;
409
410 general = find_section(bdb, BDB_GENERAL_FEATURES);
411 if (general) {
412 dev_priv->vbt.int_tv_support = general->int_tv_support;
413 dev_priv->vbt.int_crt_support = general->int_crt_support;
414 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
415 dev_priv->vbt.lvds_ssc_freq =
416 intel_bios_ssc_frequency(dev, general->ssc_freq);
417 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
418 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
419 DRM_DEBUG_KMS("BDB_GENERAL_FEATURES int_tv_support %d int_crt_support %d lvds_use_ssc %d lvds_ssc_freq %d display_clock_mode %d fdi_rx_polarity_inverted %d\n",
420 dev_priv->vbt.int_tv_support,
421 dev_priv->vbt.int_crt_support,
422 dev_priv->vbt.lvds_use_ssc,
423 dev_priv->vbt.lvds_ssc_freq,
424 dev_priv->vbt.display_clock_mode,
425 dev_priv->vbt.fdi_rx_polarity_inverted);
426 }
427 }
428
429 static void
430 parse_general_definitions(struct drm_i915_private *dev_priv,
431 struct bdb_header *bdb)
432 {
433 struct bdb_general_definitions *general;
434
435 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
436 if (general) {
437 u16 block_size = get_blocksize(general);
438 if (block_size >= sizeof(*general)) {
439 int bus_pin = general->crt_ddc_gmbus_pin;
440 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
441 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
442 dev_priv->vbt.crt_ddc_pin = bus_pin;
443 } else {
444 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
445 block_size);
446 }
447 }
448 }
449
450 static void
451 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
452 struct bdb_header *bdb)
453 {
454 struct sdvo_device_mapping *p_mapping;
455 struct bdb_general_definitions *p_defs;
456 union child_device_config *p_child;
457 int i, child_device_num, count;
458 u16 block_size;
459
460 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
461 if (!p_defs) {
462 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
463 return;
464 }
465 /* judge whether the size of child device meets the requirements.
466 * If the child device size obtained from general definition block
467 * is different with sizeof(struct child_device_config), skip the
468 * parsing of sdvo device info
469 */
470 if (p_defs->child_dev_size != sizeof(*p_child)) {
471 /* different child dev size . Ignore it */
472 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
473 return;
474 }
475 /* get the block size of general definitions */
476 block_size = get_blocksize(p_defs);
477 /* get the number of child device */
478 child_device_num = (block_size - sizeof(*p_defs)) /
479 sizeof(*p_child);
480 count = 0;
481 for (i = 0; i < child_device_num; i++) {
482 p_child = &(p_defs->devices[i]);
483 if (!p_child->old.device_type) {
484 /* skip the device block if device type is invalid */
485 continue;
486 }
487 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
488 p_child->old.slave_addr != SLAVE_ADDR2) {
489 /*
490 * If the slave address is neither 0x70 nor 0x72,
491 * it is not a SDVO device. Skip it.
492 */
493 continue;
494 }
495 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
496 p_child->old.dvo_port != DEVICE_PORT_DVOC) {
497 /* skip the incorrect SDVO port */
498 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
499 continue;
500 }
501 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
502 " %s port\n",
503 p_child->old.slave_addr,
504 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
505 "SDVOB" : "SDVOC");
506 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
507 if (!p_mapping->initialized) {
508 p_mapping->dvo_port = p_child->old.dvo_port;
509 p_mapping->slave_addr = p_child->old.slave_addr;
510 p_mapping->dvo_wiring = p_child->old.dvo_wiring;
511 p_mapping->ddc_pin = p_child->old.ddc_pin;
512 p_mapping->i2c_pin = p_child->old.i2c_pin;
513 p_mapping->initialized = 1;
514 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
515 p_mapping->dvo_port,
516 p_mapping->slave_addr,
517 p_mapping->dvo_wiring,
518 p_mapping->ddc_pin,
519 p_mapping->i2c_pin);
520 } else {
521 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
522 "two SDVO device.\n");
523 }
524 if (p_child->old.slave2_addr) {
525 /* Maybe this is a SDVO device with multiple inputs */
526 /* And the mapping info is not added */
527 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
528 " is a SDVO device with multiple inputs.\n");
529 }
530 count++;
531 }
532
533 if (!count) {
534 /* No SDVO device info is found */
535 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
536 }
537 return;
538 }
539
540 static void
541 parse_driver_features(struct drm_i915_private *dev_priv,
542 struct bdb_header *bdb)
543 {
544 struct bdb_driver_features *driver;
545
546 driver = find_section(bdb, BDB_DRIVER_FEATURES);
547 if (!driver)
548 return;
549
550 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
551 dev_priv->vbt.edp_support = 1;
552
553 if (driver->dual_frequency)
554 dev_priv->render_reclock_avail = true;
555
556 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
557 /*
558 * If DRRS is not supported, drrs_type has to be set to 0.
559 * This is because, VBT is configured in such a way that
560 * static DRRS is 0 and DRRS not supported is represented by
561 * driver->drrs_enabled=false
562 */
563 if (!driver->drrs_enabled)
564 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
565 }
566
567 static void
568 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
569 {
570 struct bdb_edp *edp;
571 struct edp_power_seq *edp_pps;
572 struct edp_link_params *edp_link_params;
573
574 edp = find_section(bdb, BDB_EDP);
575 if (!edp) {
576 if (dev_priv->vbt.edp_support)
577 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
578 return;
579 }
580
581 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
582 case EDP_18BPP:
583 dev_priv->vbt.edp_bpp = 18;
584 break;
585 case EDP_24BPP:
586 dev_priv->vbt.edp_bpp = 24;
587 break;
588 case EDP_30BPP:
589 dev_priv->vbt.edp_bpp = 30;
590 break;
591 }
592
593 /* Get the eDP sequencing and link info */
594 edp_pps = &edp->power_seqs[panel_type];
595 edp_link_params = &edp->link_params[panel_type];
596
597 dev_priv->vbt.edp_pps = *edp_pps;
598
599 switch (edp_link_params->rate) {
600 case EDP_RATE_1_62:
601 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
602 break;
603 case EDP_RATE_2_7:
604 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
605 break;
606 default:
607 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
608 edp_link_params->rate);
609 break;
610 }
611
612 switch (edp_link_params->lanes) {
613 case EDP_LANE_1:
614 dev_priv->vbt.edp_lanes = 1;
615 break;
616 case EDP_LANE_2:
617 dev_priv->vbt.edp_lanes = 2;
618 break;
619 case EDP_LANE_4:
620 dev_priv->vbt.edp_lanes = 4;
621 break;
622 default:
623 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
624 edp_link_params->lanes);
625 break;
626 }
627
628 switch (edp_link_params->preemphasis) {
629 case EDP_PREEMPHASIS_NONE:
630 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
631 break;
632 case EDP_PREEMPHASIS_3_5dB:
633 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
634 break;
635 case EDP_PREEMPHASIS_6dB:
636 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
637 break;
638 case EDP_PREEMPHASIS_9_5dB:
639 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
640 break;
641 default:
642 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
643 edp_link_params->preemphasis);
644 break;
645 }
646
647 switch (edp_link_params->vswing) {
648 case EDP_VSWING_0_4V:
649 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
650 break;
651 case EDP_VSWING_0_6V:
652 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
653 break;
654 case EDP_VSWING_0_8V:
655 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
656 break;
657 case EDP_VSWING_1_2V:
658 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
659 break;
660 default:
661 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
662 edp_link_params->vswing);
663 break;
664 }
665
666 if (bdb->version >= 173) {
667 uint8_t vswing;
668
669 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
670 dev_priv->vbt.edp_low_vswing = vswing == 0;
671 }
672 }
673
674 static void
675 parse_psr(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
676 {
677 struct bdb_psr *psr;
678 struct psr_table *psr_table;
679
680 psr = find_section(bdb, BDB_PSR);
681 if (!psr) {
682 DRM_DEBUG_KMS("No PSR BDB found.\n");
683 return;
684 }
685
686 psr_table = &psr->psr_table[panel_type];
687
688 dev_priv->vbt.psr.full_link = psr_table->full_link;
689 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
690
691 /* Allowed VBT values goes from 0 to 15 */
692 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
693 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
694
695 switch (psr_table->lines_to_wait) {
696 case 0:
697 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
698 break;
699 case 1:
700 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
701 break;
702 case 2:
703 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
704 break;
705 case 3:
706 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
707 break;
708 default:
709 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
710 psr_table->lines_to_wait);
711 break;
712 }
713
714 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
715 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
716 }
717
718 static u8 *goto_next_sequence(u8 *data, int *size)
719 {
720 u16 len;
721 int tmp = *size;
722
723 if (--tmp < 0)
724 return NULL;
725
726 /* goto first element */
727 data++;
728 while (1) {
729 switch (*data) {
730 case MIPI_SEQ_ELEM_SEND_PKT:
731 /*
732 * skip by this element payload size
733 * skip elem id, command flag and data type
734 */
735 tmp -= 5;
736 if (tmp < 0)
737 return NULL;
738
739 data += 3;
740 len = *((u16 *)data);
741
742 tmp -= len;
743 if (tmp < 0)
744 return NULL;
745
746 /* skip by len */
747 data = data + 2 + len;
748 break;
749 case MIPI_SEQ_ELEM_DELAY:
750 /* skip by elem id, and delay is 4 bytes */
751 tmp -= 5;
752 if (tmp < 0)
753 return NULL;
754
755 data += 5;
756 break;
757 case MIPI_SEQ_ELEM_GPIO:
758 tmp -= 3;
759 if (tmp < 0)
760 return NULL;
761
762 data += 3;
763 break;
764 default:
765 DRM_ERROR("Unknown element\n");
766 return NULL;
767 }
768
769 /* end of sequence ? */
770 if (*data == 0)
771 break;
772 }
773
774 /* goto next sequence or end of block byte */
775 if (--tmp < 0)
776 return NULL;
777
778 data++;
779
780 /* update amount of data left for the sequence block to be parsed */
781 *size = tmp;
782 return data;
783 }
784
785 static void
786 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
787 {
788 struct bdb_mipi_config *start;
789 struct bdb_mipi_sequence *sequence;
790 struct mipi_config *config;
791 struct mipi_pps_data *pps;
792 u8 *data, *seq_data;
793 int i, panel_id, seq_size;
794 u16 block_size;
795
796 /* parse MIPI blocks only if LFP type is MIPI */
797 if (!dev_priv->vbt.has_mipi)
798 return;
799
800 /* Initialize this to undefined indicating no generic MIPI support */
801 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
802
803 /* Block #40 is already parsed and panel_fixed_mode is
804 * stored in dev_priv->lfp_lvds_vbt_mode
805 * resuse this when needed
806 */
807
808 /* Parse #52 for panel index used from panel_type already
809 * parsed
810 */
811 start = find_section(bdb, BDB_MIPI_CONFIG);
812 if (!start) {
813 DRM_DEBUG_KMS("No MIPI config BDB found");
814 return;
815 }
816
817 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
818 panel_type);
819
820 /*
821 * get hold of the correct configuration block and pps data as per
822 * the panel_type as index
823 */
824 config = &start->config[panel_type];
825 pps = &start->pps[panel_type];
826
827 /* store as of now full data. Trim when we realise all is not needed */
828 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
829 if (!dev_priv->vbt.dsi.config)
830 return;
831
832 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
833 if (!dev_priv->vbt.dsi.pps) {
834 kfree(dev_priv->vbt.dsi.config);
835 return;
836 }
837
838 /* We have mandatory mipi config blocks. Initialize as generic panel */
839 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
840
841 /* Check if we have sequence block as well */
842 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
843 if (!sequence) {
844 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
845 return;
846 }
847
848 DRM_DEBUG_DRIVER("Found MIPI sequence block\n");
849
850 block_size = get_blocksize(sequence);
851
852 /*
853 * parse the sequence block for individual sequences
854 */
855 dev_priv->vbt.dsi.seq_version = sequence->version;
856
857 seq_data = &sequence->data[0];
858
859 /*
860 * sequence block is variable length and hence we need to parse and
861 * get the sequence data for specific panel id
862 */
863 for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) {
864 panel_id = *seq_data;
865 seq_size = *((u16 *) (seq_data + 1));
866 if (panel_id == panel_type)
867 break;
868
869 /* skip the sequence including seq header of 3 bytes */
870 seq_data = seq_data + 3 + seq_size;
871 if ((seq_data - &sequence->data[0]) > block_size) {
872 DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n");
873 return;
874 }
875 }
876
877 if (i == MAX_MIPI_CONFIGURATIONS) {
878 DRM_ERROR("Sequence block detected but no valid configuration\n");
879 return;
880 }
881
882 /* check if found sequence is completely within the sequence block
883 * just being paranoid */
884 if (seq_size > block_size) {
885 DRM_ERROR("Corrupted sequence/size, bailing out\n");
886 return;
887 }
888
889 /* skip the panel id(1 byte) and seq size(2 bytes) */
890 dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL);
891 if (!dev_priv->vbt.dsi.data)
892 return;
893
894 /*
895 * loop into the sequence data and split into multiple sequneces
896 * There are only 5 types of sequences as of now
897 */
898 data = dev_priv->vbt.dsi.data;
899 dev_priv->vbt.dsi.size = seq_size;
900
901 /* two consecutive 0x00 indicate end of all sequences */
902 while (1) {
903 int seq_id = *data;
904 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) {
905 dev_priv->vbt.dsi.sequence[seq_id] = data;
906 DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id);
907 } else {
908 DRM_ERROR("undefined sequence\n");
909 goto err;
910 }
911
912 /* partial parsing to skip elements */
913 data = goto_next_sequence(data, &seq_size);
914
915 if (data == NULL) {
916 DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n");
917 goto err;
918 }
919
920 if (*data == 0)
921 break; /* end of sequence reached */
922 }
923
924 DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n");
925 return;
926 err:
927 kfree(dev_priv->vbt.dsi.data);
928 dev_priv->vbt.dsi.data = NULL;
929
930 /* error during parsing so set all pointers to null
931 * because of partial parsing */
932 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
933 }
934
935 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
936 struct bdb_header *bdb)
937 {
938 union child_device_config *it, *child = NULL;
939 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
940 uint8_t hdmi_level_shift;
941 int i, j;
942 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
943 uint8_t aux_channel;
944 /* Each DDI port can have more than one value on the "DVO Port" field,
945 * so look for all the possible values for each port and abort if more
946 * than one is found. */
947 int dvo_ports[][2] = {
948 {DVO_PORT_HDMIA, DVO_PORT_DPA},
949 {DVO_PORT_HDMIB, DVO_PORT_DPB},
950 {DVO_PORT_HDMIC, DVO_PORT_DPC},
951 {DVO_PORT_HDMID, DVO_PORT_DPD},
952 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
953 };
954
955 /* Find the child device to use, abort if more than one found. */
956 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
957 it = dev_priv->vbt.child_dev + i;
958
959 for (j = 0; j < 2; j++) {
960 if (dvo_ports[port][j] == -1)
961 break;
962
963 if (it->common.dvo_port == dvo_ports[port][j]) {
964 if (child) {
965 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
966 port_name(port));
967 return;
968 }
969 child = it;
970 }
971 }
972 }
973 if (!child)
974 return;
975
976 aux_channel = child->raw[25];
977
978 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
979 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
980 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
981 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
982 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
983
984 info->supports_dvi = is_dvi;
985 info->supports_hdmi = is_hdmi;
986 info->supports_dp = is_dp;
987
988 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
989 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
990
991 if (is_edp && is_dvi)
992 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
993 port_name(port));
994 if (is_crt && port != PORT_E)
995 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
996 if (is_crt && (is_dvi || is_dp))
997 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
998 port_name(port));
999 if (is_dvi && (port == PORT_A || port == PORT_E))
1000 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
1001 if (!is_dvi && !is_dp && !is_crt)
1002 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
1003 port_name(port));
1004 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
1005 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
1006
1007 if (is_dvi) {
1008 if (child->common.ddc_pin == 0x05 && port != PORT_B)
1009 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
1010 if (child->common.ddc_pin == 0x04 && port != PORT_C)
1011 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
1012 if (child->common.ddc_pin == 0x06 && port != PORT_D)
1013 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
1014 }
1015
1016 if (is_dp) {
1017 if (aux_channel == 0x40 && port != PORT_A)
1018 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
1019 if (aux_channel == 0x10 && port != PORT_B)
1020 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
1021 if (aux_channel == 0x20 && port != PORT_C)
1022 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
1023 if (aux_channel == 0x30 && port != PORT_D)
1024 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
1025 }
1026
1027 if (bdb->version >= 158) {
1028 /* The VBT HDMI level shift values match the table we have. */
1029 hdmi_level_shift = child->raw[7] & 0xF;
1030 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1031 port_name(port),
1032 hdmi_level_shift);
1033 info->hdmi_level_shift = hdmi_level_shift;
1034 }
1035 }
1036
1037 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
1038 struct bdb_header *bdb)
1039 {
1040 struct drm_device *dev = dev_priv->dev;
1041 enum port port;
1042
1043 if (!HAS_DDI(dev))
1044 return;
1045
1046 if (!dev_priv->vbt.child_dev_num)
1047 return;
1048
1049 if (bdb->version < 155)
1050 return;
1051
1052 for (port = PORT_A; port < I915_MAX_PORTS; port++)
1053 parse_ddi_port(dev_priv, port, bdb);
1054 }
1055
1056 static void
1057 parse_device_mapping(struct drm_i915_private *dev_priv,
1058 struct bdb_header *bdb)
1059 {
1060 struct bdb_general_definitions *p_defs;
1061 union child_device_config *p_child, *child_dev_ptr;
1062 int i, child_device_num, count;
1063 u16 block_size;
1064
1065 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1066 if (!p_defs) {
1067 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1068 return;
1069 }
1070 /* judge whether the size of child device meets the requirements.
1071 * If the child device size obtained from general definition block
1072 * is different with sizeof(struct child_device_config), skip the
1073 * parsing of sdvo device info
1074 */
1075 if (p_defs->child_dev_size != sizeof(*p_child)) {
1076 /* different child dev size . Ignore it */
1077 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
1078 return;
1079 }
1080 /* get the block size of general definitions */
1081 block_size = get_blocksize(p_defs);
1082 /* get the number of child device */
1083 child_device_num = (block_size - sizeof(*p_defs)) /
1084 sizeof(*p_child);
1085 count = 0;
1086 /* get the number of child device that is present */
1087 for (i = 0; i < child_device_num; i++) {
1088 p_child = &(p_defs->devices[i]);
1089 if (!p_child->common.device_type) {
1090 /* skip the device block if device type is invalid */
1091 continue;
1092 }
1093 count++;
1094 }
1095 if (!count) {
1096 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1097 return;
1098 }
1099 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1100 if (!dev_priv->vbt.child_dev) {
1101 DRM_DEBUG_KMS("No memory space for child device\n");
1102 return;
1103 }
1104
1105 dev_priv->vbt.child_dev_num = count;
1106 count = 0;
1107 for (i = 0; i < child_device_num; i++) {
1108 p_child = &(p_defs->devices[i]);
1109 if (!p_child->common.device_type) {
1110 /* skip the device block if device type is invalid */
1111 continue;
1112 }
1113
1114 if (p_child->common.dvo_port >= DVO_PORT_MIPIA
1115 && p_child->common.dvo_port <= DVO_PORT_MIPID
1116 &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) {
1117 DRM_DEBUG_KMS("Found MIPI as LFP\n");
1118 dev_priv->vbt.has_mipi = 1;
1119 dev_priv->vbt.dsi.port = p_child->common.dvo_port;
1120 }
1121
1122 child_dev_ptr = dev_priv->vbt.child_dev + count;
1123 count++;
1124 memcpy((void *)child_dev_ptr, (void *)p_child,
1125 sizeof(*p_child));
1126 }
1127 return;
1128 }
1129
1130 static void
1131 init_vbt_defaults(struct drm_i915_private *dev_priv)
1132 {
1133 struct drm_device *dev = dev_priv->dev;
1134 enum port port;
1135
1136 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
1137
1138 /* Default to having backlight */
1139 dev_priv->vbt.backlight.present = true;
1140
1141 /* LFP panel data */
1142 dev_priv->vbt.lvds_dither = 1;
1143 dev_priv->vbt.lvds_vbt = 0;
1144
1145 /* SDVO panel data */
1146 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1147
1148 /* general features */
1149 dev_priv->vbt.int_tv_support = 1;
1150 dev_priv->vbt.int_crt_support = 1;
1151
1152 /* Default to using SSC */
1153 dev_priv->vbt.lvds_use_ssc = 1;
1154 /*
1155 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1156 * clock for LVDS.
1157 */
1158 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
1159 !HAS_PCH_SPLIT(dev));
1160 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1161
1162 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1163 struct ddi_vbt_port_info *info =
1164 &dev_priv->vbt.ddi_port_info[port];
1165
1166 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1167
1168 info->supports_dvi = (port != PORT_A && port != PORT_E);
1169 info->supports_hdmi = info->supports_dvi;
1170 info->supports_dp = (port != PORT_E);
1171 }
1172 }
1173
1174 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
1175 {
1176 DRM_DEBUG_KMS("Falling back to manually reading VBT from "
1177 "VBIOS ROM for %s\n",
1178 id->ident);
1179 return 1;
1180 }
1181
1182 static const struct dmi_system_id intel_no_opregion_vbt[] = {
1183 {
1184 .callback = intel_no_opregion_vbt_callback,
1185 .ident = "ThinkCentre A57",
1186 .matches = {
1187 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1188 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
1189 },
1190 },
1191 { }
1192 };
1193
1194 static struct bdb_header *validate_vbt(char *base, size_t size,
1195 struct vbt_header *vbt,
1196 const char *source)
1197 {
1198 size_t offset;
1199 struct bdb_header *bdb;
1200
1201 if (vbt == NULL) {
1202 DRM_DEBUG_DRIVER("VBT signature missing\n");
1203 return NULL;
1204 }
1205
1206 offset = (char *)vbt - base;
1207 if (offset + sizeof(struct vbt_header) > size) {
1208 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1209 return NULL;
1210 }
1211
1212 if (memcmp(vbt->signature, "$VBT", 4)) {
1213 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1214 return NULL;
1215 }
1216
1217 offset += vbt->bdb_offset;
1218 if (offset + sizeof(struct bdb_header) > size) {
1219 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1220 return NULL;
1221 }
1222
1223 bdb = (struct bdb_header *)(base + offset);
1224 if (offset + bdb->bdb_size > size) {
1225 DRM_DEBUG_DRIVER("BDB incomplete\n");
1226 return NULL;
1227 }
1228
1229 DRM_DEBUG_KMS("Using VBT from %s: %20s\n",
1230 source, vbt->signature);
1231 return bdb;
1232 }
1233
1234 /**
1235 * intel_parse_bios - find VBT and initialize settings from the BIOS
1236 * @dev: DRM device
1237 *
1238 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1239 * to appropriate values.
1240 *
1241 * Returns 0 on success, nonzero on failure.
1242 */
1243 int
1244 intel_parse_bios(struct drm_device *dev)
1245 {
1246 struct drm_i915_private *dev_priv = dev->dev_private;
1247 struct pci_dev *pdev = dev->pdev;
1248 struct bdb_header *bdb = NULL;
1249 u8 __iomem *bios = NULL;
1250
1251 if (HAS_PCH_NOP(dev))
1252 return -ENODEV;
1253
1254 init_vbt_defaults(dev_priv);
1255
1256 /* XXX Should this validation be moved to intel_opregion.c? */
1257 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt)
1258 bdb = validate_vbt((char *)dev_priv->opregion.header, OPREGION_SIZE,
1259 (struct vbt_header *)dev_priv->opregion.vbt,
1260 "OpRegion");
1261
1262 if (bdb == NULL) {
1263 size_t i, size;
1264
1265 bios = pci_map_rom(pdev, &size);
1266 if (!bios)
1267 return -1;
1268
1269 /* Scour memory looking for the VBT signature */
1270 for (i = 0; i + 4 < size; i++) {
1271 if (memcmp(bios + i, "$VBT", 4) == 0) {
1272 bdb = validate_vbt(bios, size,
1273 (struct vbt_header *)(bios + i),
1274 "PCI ROM");
1275 break;
1276 }
1277 }
1278
1279 if (!bdb) {
1280 pci_unmap_rom(pdev, bios);
1281 return -1;
1282 }
1283 }
1284
1285 /* Grab useful general definitions */
1286 parse_general_features(dev_priv, bdb);
1287 parse_general_definitions(dev_priv, bdb);
1288 parse_lfp_panel_data(dev_priv, bdb);
1289 parse_lfp_backlight(dev_priv, bdb);
1290 parse_sdvo_panel_data(dev_priv, bdb);
1291 parse_sdvo_device_mapping(dev_priv, bdb);
1292 parse_device_mapping(dev_priv, bdb);
1293 parse_driver_features(dev_priv, bdb);
1294 parse_edp(dev_priv, bdb);
1295 parse_psr(dev_priv, bdb);
1296 parse_mipi(dev_priv, bdb);
1297 parse_ddi_ports(dev_priv, bdb);
1298
1299 if (bios)
1300 pci_unmap_rom(pdev, bios);
1301
1302 return 0;
1303 }
1304
1305 /* Ensure that vital registers have been initialised, even if the BIOS
1306 * is absent or just failing to do its job.
1307 */
1308 void intel_setup_bios(struct drm_device *dev)
1309 {
1310 struct drm_i915_private *dev_priv = dev->dev_private;
1311
1312 /* Set the Panel Power On/Off timings if uninitialized. */
1313 if (!HAS_PCH_SPLIT(dev) &&
1314 I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
1315 /* Set T2 to 40ms and T5 to 200ms */
1316 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
1317
1318 /* Set T3 to 35ms and Tx to 200ms */
1319 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
1320 }
1321 }
Linux kernel - Deliverables
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