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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
28#include <drm/drm_dp_helper.h>
29#include <drm/drmP.h>
30#include <drm/i915_drm.h>
31#include "i915_drv.h"
32
33#define _INTEL_BIOS_PRIVATE
34#include "intel_vbt_defs.h"
35
36/**
37 * DOC: Video BIOS Table (VBT)
38 *
39 * The Video BIOS Table, or VBT, provides platform and board specific
40 * configuration information to the driver that is not discoverable or available
41 * through other means. The configuration is mostly related to display
42 * hardware. The VBT is available via the ACPI OpRegion or, on older systems, in
43 * the PCI ROM.
44 *
45 * The VBT consists of a VBT Header (defined as &struct vbt_header), a BDB
46 * Header (&struct bdb_header), and a number of BIOS Data Blocks (BDB) that
47 * contain the actual configuration information. The VBT Header, and thus the
48 * VBT, begins with "$VBT" signature. The VBT Header contains the offset of the
49 * BDB Header. The data blocks are concatenated after the BDB Header. The data
50 * blocks have a 1-byte Block ID, 2-byte Block Size, and Block Size bytes of
51 * data. (Block 53, the MIPI Sequence Block is an exception.)
52 *
53 * The driver parses the VBT during load. The relevant information is stored in
54 * driver private data for ease of use, and the actual VBT is not read after
55 * that.
56 */
57
58#define SLAVE_ADDR1 0x70
59#define SLAVE_ADDR2 0x72
60
61/* Get BDB block size given a pointer to Block ID. */
62static u32 _get_blocksize(const u8 *block_base)
63{
64 /* The MIPI Sequence Block v3+ has a separate size field. */
65 if (*block_base == BDB_MIPI_SEQUENCE && *(block_base + 3) >= 3)
66 return *((const u32 *)(block_base + 4));
67 else
68 return *((const u16 *)(block_base + 1));
69}
70
71/* Get BDB block size give a pointer to data after Block ID and Block Size. */
72static u32 get_blocksize(const void *block_data)
73{
74 return _get_blocksize(block_data - 3);
75}
76
77static const void *
78find_section(const void *_bdb, int section_id)
79{
80 const struct bdb_header *bdb = _bdb;
81 const u8 *base = _bdb;
82 int index = 0;
83 u32 total, current_size;
84 u8 current_id;
85
86 /* skip to first section */
87 index += bdb->header_size;
88 total = bdb->bdb_size;
89
90 /* walk the sections looking for section_id */
91 while (index + 3 < total) {
92 current_id = *(base + index);
93 current_size = _get_blocksize(base + index);
94 index += 3;
95
96 if (index + current_size > total)
97 return NULL;
98
99 if (current_id == section_id)
100 return base + index;
101
102 index += current_size;
103 }
104
105 return NULL;
106}
107
108static void
109fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
110 const struct lvds_dvo_timing *dvo_timing)
111{
112 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
113 dvo_timing->hactive_lo;
114 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
115 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
116 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
117 dvo_timing->hsync_pulse_width;
118 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
119 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
120
121 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
122 dvo_timing->vactive_lo;
123 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
124 dvo_timing->vsync_off;
125 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
126 dvo_timing->vsync_pulse_width;
127 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
128 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
129 panel_fixed_mode->clock = dvo_timing->clock * 10;
130 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
131
132 if (dvo_timing->hsync_positive)
133 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
134 else
135 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
136
137 if (dvo_timing->vsync_positive)
138 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
139 else
140 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
141
142 panel_fixed_mode->width_mm = (dvo_timing->himage_hi << 8) |
143 dvo_timing->himage_lo;
144 panel_fixed_mode->height_mm = (dvo_timing->vimage_hi << 8) |
145 dvo_timing->vimage_lo;
146
147 /* Some VBTs have bogus h/vtotal values */
148 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
149 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
150 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
151 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
152
153 drm_mode_set_name(panel_fixed_mode);
154}
155
156static const struct lvds_dvo_timing *
157get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
158 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
159 int index)
160{
161 /*
162 * the size of fp_timing varies on the different platform.
163 * So calculate the DVO timing relative offset in LVDS data
164 * entry to get the DVO timing entry
165 */
166
167 int lfp_data_size =
168 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
169 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
170 int dvo_timing_offset =
171 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
172 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
173 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
174
175 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
176}
177
178/* get lvds_fp_timing entry
179 * this function may return NULL if the corresponding entry is invalid
180 */
181static const struct lvds_fp_timing *
182get_lvds_fp_timing(const struct bdb_header *bdb,
183 const struct bdb_lvds_lfp_data *data,
184 const struct bdb_lvds_lfp_data_ptrs *ptrs,
185 int index)
186{
187 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
188 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
189 size_t ofs;
190
191 if (index >= ARRAY_SIZE(ptrs->ptr))
192 return NULL;
193 ofs = ptrs->ptr[index].fp_timing_offset;
194 if (ofs < data_ofs ||
195 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
196 return NULL;
197 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
198}
199
200/* Try to find integrated panel data */
201static void
202parse_lfp_panel_data(struct drm_i915_private *dev_priv,
203 const struct bdb_header *bdb)
204{
205 const struct bdb_lvds_options *lvds_options;
206 const struct bdb_lvds_lfp_data *lvds_lfp_data;
207 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
208 const struct lvds_dvo_timing *panel_dvo_timing;
209 const struct lvds_fp_timing *fp_timing;
210 struct drm_display_mode *panel_fixed_mode;
211 int panel_type;
212 int drrs_mode;
213 int ret;
214
215 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
216 if (!lvds_options)
217 return;
218
219 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
220
221 ret = intel_opregion_get_panel_type(dev_priv);
222 if (ret >= 0) {
223 WARN_ON(ret > 0xf);
224 panel_type = ret;
225 DRM_DEBUG_KMS("Panel type: %d (OpRegion)\n", panel_type);
226 } else {
227 if (lvds_options->panel_type > 0xf) {
228 DRM_DEBUG_KMS("Invalid VBT panel type 0x%x\n",
229 lvds_options->panel_type);
230 return;
231 }
232 panel_type = lvds_options->panel_type;
233 DRM_DEBUG_KMS("Panel type: %d (VBT)\n", panel_type);
234 }
235
236 dev_priv->vbt.panel_type = panel_type;
237
238 drrs_mode = (lvds_options->dps_panel_type_bits
239 >> (panel_type * 2)) & MODE_MASK;
240 /*
241 * VBT has static DRRS = 0 and seamless DRRS = 2.
242 * The below piece of code is required to adjust vbt.drrs_type
243 * to match the enum drrs_support_type.
244 */
245 switch (drrs_mode) {
246 case 0:
247 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
248 DRM_DEBUG_KMS("DRRS supported mode is static\n");
249 break;
250 case 2:
251 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
252 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
253 break;
254 default:
255 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
256 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
257 break;
258 }
259
260 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
261 if (!lvds_lfp_data)
262 return;
263
264 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
265 if (!lvds_lfp_data_ptrs)
266 return;
267
268 dev_priv->vbt.lvds_vbt = 1;
269
270 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
271 lvds_lfp_data_ptrs,
272 panel_type);
273
274 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
275 if (!panel_fixed_mode)
276 return;
277
278 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
279
280 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
281
282 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
283 drm_mode_debug_printmodeline(panel_fixed_mode);
284
285 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
286 lvds_lfp_data_ptrs,
287 panel_type);
288 if (fp_timing) {
289 /* check the resolution, just to be sure */
290 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
291 fp_timing->y_res == panel_fixed_mode->vdisplay) {
292 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
293 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
294 dev_priv->vbt.bios_lvds_val);
295 }
296 }
297}
298
299static void
300parse_lfp_backlight(struct drm_i915_private *dev_priv,
301 const struct bdb_header *bdb)
302{
303 const struct bdb_lfp_backlight_data *backlight_data;
304 const struct bdb_lfp_backlight_data_entry *entry;
305 int panel_type = dev_priv->vbt.panel_type;
306
307 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
308 if (!backlight_data)
309 return;
310
311 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
312 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
313 backlight_data->entry_size);
314 return;
315 }
316
317 entry = &backlight_data->data[panel_type];
318
319 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
320 if (!dev_priv->vbt.backlight.present) {
321 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
322 entry->type);
323 return;
324 }
325
326 dev_priv->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI;
327 if (bdb->version >= 191 &&
328 get_blocksize(backlight_data) >= sizeof(*backlight_data)) {
329 const struct bdb_lfp_backlight_control_method *method;
330
331 method = &backlight_data->backlight_control[panel_type];
332 dev_priv->vbt.backlight.type = method->type;
333 }
334
335 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
336 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
337 dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
338 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
339 "active %s, min brightness %u, level %u\n",
340 dev_priv->vbt.backlight.pwm_freq_hz,
341 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
342 dev_priv->vbt.backlight.min_brightness,
343 backlight_data->level[panel_type]);
344}
345
346/* Try to find sdvo panel data */
347static void
348parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
349 const struct bdb_header *bdb)
350{
351 const struct lvds_dvo_timing *dvo_timing;
352 struct drm_display_mode *panel_fixed_mode;
353 int index;
354
355 index = i915.vbt_sdvo_panel_type;
356 if (index == -2) {
357 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
358 return;
359 }
360
361 if (index == -1) {
362 const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
363
364 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
365 if (!sdvo_lvds_options)
366 return;
367
368 index = sdvo_lvds_options->panel_type;
369 }
370
371 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
372 if (!dvo_timing)
373 return;
374
375 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
376 if (!panel_fixed_mode)
377 return;
378
379 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
380
381 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
382
383 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
384 drm_mode_debug_printmodeline(panel_fixed_mode);
385}
386
387static int intel_bios_ssc_frequency(struct drm_i915_private *dev_priv,
388 bool alternate)
389{
390 switch (INTEL_INFO(dev_priv)->gen) {
391 case 2:
392 return alternate ? 66667 : 48000;
393 case 3:
394 case 4:
395 return alternate ? 100000 : 96000;
396 default:
397 return alternate ? 100000 : 120000;
398 }
399}
400
401static void
402parse_general_features(struct drm_i915_private *dev_priv,
403 const struct bdb_header *bdb)
404{
405 const struct bdb_general_features *general;
406
407 general = find_section(bdb, BDB_GENERAL_FEATURES);
408 if (!general)
409 return;
410
411 dev_priv->vbt.int_tv_support = general->int_tv_support;
412 /* int_crt_support can't be trusted on earlier platforms */
413 if (bdb->version >= 155 &&
414 (HAS_DDI(dev_priv) || IS_VALLEYVIEW(dev_priv)))
415 dev_priv->vbt.int_crt_support = general->int_crt_support;
416 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
417 dev_priv->vbt.lvds_ssc_freq =
418 intel_bios_ssc_frequency(dev_priv, general->ssc_freq);
419 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
420 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
421 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",
422 dev_priv->vbt.int_tv_support,
423 dev_priv->vbt.int_crt_support,
424 dev_priv->vbt.lvds_use_ssc,
425 dev_priv->vbt.lvds_ssc_freq,
426 dev_priv->vbt.display_clock_mode,
427 dev_priv->vbt.fdi_rx_polarity_inverted);
428}
429
430static void
431parse_general_definitions(struct drm_i915_private *dev_priv,
432 const struct bdb_header *bdb)
433{
434 const struct bdb_general_definitions *general;
435
436 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
437 if (general) {
438 u16 block_size = get_blocksize(general);
439 if (block_size >= sizeof(*general)) {
440 int bus_pin = general->crt_ddc_gmbus_pin;
441 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
442 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
443 dev_priv->vbt.crt_ddc_pin = bus_pin;
444 } else {
445 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
446 block_size);
447 }
448 }
449}
450
451static const union child_device_config *
452child_device_ptr(const struct bdb_general_definitions *p_defs, int i)
453{
454 return (const void *) &p_defs->devices[i * p_defs->child_dev_size];
455}
456
457static void
458parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
459 const struct bdb_header *bdb)
460{
461 struct sdvo_device_mapping *p_mapping;
462 const struct bdb_general_definitions *p_defs;
463 const struct old_child_dev_config *child; /* legacy */
464 int i, child_device_num, count;
465 u16 block_size;
466
467 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
468 if (!p_defs) {
469 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
470 return;
471 }
472
473 /*
474 * Only parse SDVO mappings when the general definitions block child
475 * device size matches that of the *legacy* child device config
476 * struct. Thus, SDVO mapping will be skipped for newer VBT.
477 */
478 if (p_defs->child_dev_size != sizeof(*child)) {
479 DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n");
480 return;
481 }
482 /* get the block size of general definitions */
483 block_size = get_blocksize(p_defs);
484 /* get the number of child device */
485 child_device_num = (block_size - sizeof(*p_defs)) /
486 p_defs->child_dev_size;
487 count = 0;
488 for (i = 0; i < child_device_num; i++) {
489 child = &child_device_ptr(p_defs, i)->old;
490 if (!child->device_type) {
491 /* skip the device block if device type is invalid */
492 continue;
493 }
494 if (child->slave_addr != SLAVE_ADDR1 &&
495 child->slave_addr != SLAVE_ADDR2) {
496 /*
497 * If the slave address is neither 0x70 nor 0x72,
498 * it is not a SDVO device. Skip it.
499 */
500 continue;
501 }
502 if (child->dvo_port != DEVICE_PORT_DVOB &&
503 child->dvo_port != DEVICE_PORT_DVOC) {
504 /* skip the incorrect SDVO port */
505 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
506 continue;
507 }
508 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
509 " %s port\n",
510 child->slave_addr,
511 (child->dvo_port == DEVICE_PORT_DVOB) ?
512 "SDVOB" : "SDVOC");
513 p_mapping = &dev_priv->vbt.sdvo_mappings[child->dvo_port - 1];
514 if (!p_mapping->initialized) {
515 p_mapping->dvo_port = child->dvo_port;
516 p_mapping->slave_addr = child->slave_addr;
517 p_mapping->dvo_wiring = child->dvo_wiring;
518 p_mapping->ddc_pin = child->ddc_pin;
519 p_mapping->i2c_pin = child->i2c_pin;
520 p_mapping->initialized = 1;
521 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
522 p_mapping->dvo_port,
523 p_mapping->slave_addr,
524 p_mapping->dvo_wiring,
525 p_mapping->ddc_pin,
526 p_mapping->i2c_pin);
527 } else {
528 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
529 "two SDVO device.\n");
530 }
531 if (child->slave2_addr) {
532 /* Maybe this is a SDVO device with multiple inputs */
533 /* And the mapping info is not added */
534 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
535 " is a SDVO device with multiple inputs.\n");
536 }
537 count++;
538 }
539
540 if (!count) {
541 /* No SDVO device info is found */
542 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
543 }
544 return;
545}
546
547static void
548parse_driver_features(struct drm_i915_private *dev_priv,
549 const struct bdb_header *bdb)
550{
551 const struct bdb_driver_features *driver;
552
553 driver = find_section(bdb, BDB_DRIVER_FEATURES);
554 if (!driver)
555 return;
556
557 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
558 dev_priv->vbt.edp.support = 1;
559
560 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
561 /*
562 * If DRRS is not supported, drrs_type has to be set to 0.
563 * This is because, VBT is configured in such a way that
564 * static DRRS is 0 and DRRS not supported is represented by
565 * driver->drrs_enabled=false
566 */
567 if (!driver->drrs_enabled)
568 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
569}
570
571static void
572parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
573{
574 const struct bdb_edp *edp;
575 const struct edp_power_seq *edp_pps;
576 const struct edp_link_params *edp_link_params;
577 int panel_type = dev_priv->vbt.panel_type;
578
579 edp = find_section(bdb, BDB_EDP);
580 if (!edp) {
581 if (dev_priv->vbt.edp.support)
582 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
583 return;
584 }
585
586 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
587 case EDP_18BPP:
588 dev_priv->vbt.edp.bpp = 18;
589 break;
590 case EDP_24BPP:
591 dev_priv->vbt.edp.bpp = 24;
592 break;
593 case EDP_30BPP:
594 dev_priv->vbt.edp.bpp = 30;
595 break;
596 }
597
598 /* Get the eDP sequencing and link info */
599 edp_pps = &edp->power_seqs[panel_type];
600 edp_link_params = &edp->link_params[panel_type];
601
602 dev_priv->vbt.edp.pps = *edp_pps;
603
604 switch (edp_link_params->rate) {
605 case EDP_RATE_1_62:
606 dev_priv->vbt.edp.rate = DP_LINK_BW_1_62;
607 break;
608 case EDP_RATE_2_7:
609 dev_priv->vbt.edp.rate = DP_LINK_BW_2_7;
610 break;
611 default:
612 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
613 edp_link_params->rate);
614 break;
615 }
616
617 switch (edp_link_params->lanes) {
618 case EDP_LANE_1:
619 dev_priv->vbt.edp.lanes = 1;
620 break;
621 case EDP_LANE_2:
622 dev_priv->vbt.edp.lanes = 2;
623 break;
624 case EDP_LANE_4:
625 dev_priv->vbt.edp.lanes = 4;
626 break;
627 default:
628 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
629 edp_link_params->lanes);
630 break;
631 }
632
633 switch (edp_link_params->preemphasis) {
634 case EDP_PREEMPHASIS_NONE:
635 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
636 break;
637 case EDP_PREEMPHASIS_3_5dB:
638 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
639 break;
640 case EDP_PREEMPHASIS_6dB:
641 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
642 break;
643 case EDP_PREEMPHASIS_9_5dB:
644 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
645 break;
646 default:
647 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
648 edp_link_params->preemphasis);
649 break;
650 }
651
652 switch (edp_link_params->vswing) {
653 case EDP_VSWING_0_4V:
654 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
655 break;
656 case EDP_VSWING_0_6V:
657 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
658 break;
659 case EDP_VSWING_0_8V:
660 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
661 break;
662 case EDP_VSWING_1_2V:
663 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
664 break;
665 default:
666 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
667 edp_link_params->vswing);
668 break;
669 }
670
671 if (bdb->version >= 173) {
672 uint8_t vswing;
673
674 /* Don't read from VBT if module parameter has valid value*/
675 if (i915.edp_vswing) {
676 dev_priv->vbt.edp.low_vswing = i915.edp_vswing == 1;
677 } else {
678 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
679 dev_priv->vbt.edp.low_vswing = vswing == 0;
680 }
681 }
682}
683
684static void
685parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
686{
687 const struct bdb_psr *psr;
688 const struct psr_table *psr_table;
689 int panel_type = dev_priv->vbt.panel_type;
690
691 psr = find_section(bdb, BDB_PSR);
692 if (!psr) {
693 DRM_DEBUG_KMS("No PSR BDB found.\n");
694 return;
695 }
696
697 psr_table = &psr->psr_table[panel_type];
698
699 dev_priv->vbt.psr.full_link = psr_table->full_link;
700 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
701
702 /* Allowed VBT values goes from 0 to 15 */
703 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
704 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
705
706 switch (psr_table->lines_to_wait) {
707 case 0:
708 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
709 break;
710 case 1:
711 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
712 break;
713 case 2:
714 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
715 break;
716 case 3:
717 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
718 break;
719 default:
720 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
721 psr_table->lines_to_wait);
722 break;
723 }
724
725 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
726 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
727}
728
729static void
730parse_mipi_config(struct drm_i915_private *dev_priv,
731 const struct bdb_header *bdb)
732{
733 const struct bdb_mipi_config *start;
734 const struct mipi_config *config;
735 const struct mipi_pps_data *pps;
736 int panel_type = dev_priv->vbt.panel_type;
737
738 /* parse MIPI blocks only if LFP type is MIPI */
739 if (!intel_bios_is_dsi_present(dev_priv, NULL))
740 return;
741
742 /* Initialize this to undefined indicating no generic MIPI support */
743 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
744
745 /* Block #40 is already parsed and panel_fixed_mode is
746 * stored in dev_priv->lfp_lvds_vbt_mode
747 * resuse this when needed
748 */
749
750 /* Parse #52 for panel index used from panel_type already
751 * parsed
752 */
753 start = find_section(bdb, BDB_MIPI_CONFIG);
754 if (!start) {
755 DRM_DEBUG_KMS("No MIPI config BDB found");
756 return;
757 }
758
759 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
760 panel_type);
761
762 /*
763 * get hold of the correct configuration block and pps data as per
764 * the panel_type as index
765 */
766 config = &start->config[panel_type];
767 pps = &start->pps[panel_type];
768
769 /* store as of now full data. Trim when we realise all is not needed */
770 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
771 if (!dev_priv->vbt.dsi.config)
772 return;
773
774 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
775 if (!dev_priv->vbt.dsi.pps) {
776 kfree(dev_priv->vbt.dsi.config);
777 return;
778 }
779
780 /*
781 * These fields are introduced from the VBT version 197 onwards,
782 * so making sure that these bits are set zero in the previous
783 * versions.
784 */
785 if (dev_priv->vbt.dsi.config->dual_link && bdb->version < 197) {
786 dev_priv->vbt.dsi.config->dl_dcs_cabc_ports = 0;
787 dev_priv->vbt.dsi.config->dl_dcs_backlight_ports = 0;
788 }
789
790 /* We have mandatory mipi config blocks. Initialize as generic panel */
791 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
792}
793
794/* Find the sequence block and size for the given panel. */
795static const u8 *
796find_panel_sequence_block(const struct bdb_mipi_sequence *sequence,
797 u16 panel_id, u32 *seq_size)
798{
799 u32 total = get_blocksize(sequence);
800 const u8 *data = &sequence->data[0];
801 u8 current_id;
802 u32 current_size;
803 int header_size = sequence->version >= 3 ? 5 : 3;
804 int index = 0;
805 int i;
806
807 /* skip new block size */
808 if (sequence->version >= 3)
809 data += 4;
810
811 for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) {
812 if (index + header_size > total) {
813 DRM_ERROR("Invalid sequence block (header)\n");
814 return NULL;
815 }
816
817 current_id = *(data + index);
818 if (sequence->version >= 3)
819 current_size = *((const u32 *)(data + index + 1));
820 else
821 current_size = *((const u16 *)(data + index + 1));
822
823 index += header_size;
824
825 if (index + current_size > total) {
826 DRM_ERROR("Invalid sequence block\n");
827 return NULL;
828 }
829
830 if (current_id == panel_id) {
831 *seq_size = current_size;
832 return data + index;
833 }
834
835 index += current_size;
836 }
837
838 DRM_ERROR("Sequence block detected but no valid configuration\n");
839
840 return NULL;
841}
842
843static int goto_next_sequence(const u8 *data, int index, int total)
844{
845 u16 len;
846
847 /* Skip Sequence Byte. */
848 for (index = index + 1; index < total; index += len) {
849 u8 operation_byte = *(data + index);
850 index++;
851
852 switch (operation_byte) {
853 case MIPI_SEQ_ELEM_END:
854 return index;
855 case MIPI_SEQ_ELEM_SEND_PKT:
856 if (index + 4 > total)
857 return 0;
858
859 len = *((const u16 *)(data + index + 2)) + 4;
860 break;
861 case MIPI_SEQ_ELEM_DELAY:
862 len = 4;
863 break;
864 case MIPI_SEQ_ELEM_GPIO:
865 len = 2;
866 break;
867 case MIPI_SEQ_ELEM_I2C:
868 if (index + 7 > total)
869 return 0;
870 len = *(data + index + 6) + 7;
871 break;
872 default:
873 DRM_ERROR("Unknown operation byte\n");
874 return 0;
875 }
876 }
877
878 return 0;
879}
880
881static int goto_next_sequence_v3(const u8 *data, int index, int total)
882{
883 int seq_end;
884 u16 len;
885 u32 size_of_sequence;
886
887 /*
888 * Could skip sequence based on Size of Sequence alone, but also do some
889 * checking on the structure.
890 */
891 if (total < 5) {
892 DRM_ERROR("Too small sequence size\n");
893 return 0;
894 }
895
896 /* Skip Sequence Byte. */
897 index++;
898
899 /*
900 * Size of Sequence. Excludes the Sequence Byte and the size itself,
901 * includes MIPI_SEQ_ELEM_END byte, excludes the final MIPI_SEQ_END
902 * byte.
903 */
904 size_of_sequence = *((const uint32_t *)(data + index));
905 index += 4;
906
907 seq_end = index + size_of_sequence;
908 if (seq_end > total) {
909 DRM_ERROR("Invalid sequence size\n");
910 return 0;
911 }
912
913 for (; index < total; index += len) {
914 u8 operation_byte = *(data + index);
915 index++;
916
917 if (operation_byte == MIPI_SEQ_ELEM_END) {
918 if (index != seq_end) {
919 DRM_ERROR("Invalid element structure\n");
920 return 0;
921 }
922 return index;
923 }
924
925 len = *(data + index);
926 index++;
927
928 /*
929 * FIXME: Would be nice to check elements like for v1/v2 in
930 * goto_next_sequence() above.
931 */
932 switch (operation_byte) {
933 case MIPI_SEQ_ELEM_SEND_PKT:
934 case MIPI_SEQ_ELEM_DELAY:
935 case MIPI_SEQ_ELEM_GPIO:
936 case MIPI_SEQ_ELEM_I2C:
937 case MIPI_SEQ_ELEM_SPI:
938 case MIPI_SEQ_ELEM_PMIC:
939 break;
940 default:
941 DRM_ERROR("Unknown operation byte %u\n",
942 operation_byte);
943 break;
944 }
945 }
946
947 return 0;
948}
949
950static void
951parse_mipi_sequence(struct drm_i915_private *dev_priv,
952 const struct bdb_header *bdb)
953{
954 int panel_type = dev_priv->vbt.panel_type;
955 const struct bdb_mipi_sequence *sequence;
956 const u8 *seq_data;
957 u32 seq_size;
958 u8 *data;
959 int index = 0;
960
961 /* Only our generic panel driver uses the sequence block. */
962 if (dev_priv->vbt.dsi.panel_id != MIPI_DSI_GENERIC_PANEL_ID)
963 return;
964
965 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
966 if (!sequence) {
967 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
968 return;
969 }
970
971 /* Fail gracefully for forward incompatible sequence block. */
972 if (sequence->version >= 4) {
973 DRM_ERROR("Unable to parse MIPI Sequence Block v%u\n",
974 sequence->version);
975 return;
976 }
977
978 DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence->version);
979
980 seq_data = find_panel_sequence_block(sequence, panel_type, &seq_size);
981 if (!seq_data)
982 return;
983
984 data = kmemdup(seq_data, seq_size, GFP_KERNEL);
985 if (!data)
986 return;
987
988 /* Parse the sequences, store pointers to each sequence. */
989 for (;;) {
990 u8 seq_id = *(data + index);
991 if (seq_id == MIPI_SEQ_END)
992 break;
993
994 if (seq_id >= MIPI_SEQ_MAX) {
995 DRM_ERROR("Unknown sequence %u\n", seq_id);
996 goto err;
997 }
998
999 /* Log about presence of sequences we won't run. */
1000 if (seq_id == MIPI_SEQ_TEAR_ON || seq_id == MIPI_SEQ_TEAR_OFF)
1001 DRM_DEBUG_KMS("Unsupported sequence %u\n", seq_id);
1002
1003 dev_priv->vbt.dsi.sequence[seq_id] = data + index;
1004
1005 if (sequence->version >= 3)
1006 index = goto_next_sequence_v3(data, index, seq_size);
1007 else
1008 index = goto_next_sequence(data, index, seq_size);
1009 if (!index) {
1010 DRM_ERROR("Invalid sequence %u\n", seq_id);
1011 goto err;
1012 }
1013 }
1014
1015 dev_priv->vbt.dsi.data = data;
1016 dev_priv->vbt.dsi.size = seq_size;
1017 dev_priv->vbt.dsi.seq_version = sequence->version;
1018
1019 DRM_DEBUG_DRIVER("MIPI related VBT parsing complete\n");
1020 return;
1021
1022err:
1023 kfree(data);
1024 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
1025}
1026
1027static u8 translate_iboost(u8 val)
1028{
1029 static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
1030
1031 if (val >= ARRAY_SIZE(mapping)) {
1032 DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
1033 return 0;
1034 }
1035 return mapping[val];
1036}
1037
1038static void sanitize_ddc_pin(struct drm_i915_private *dev_priv,
1039 enum port port)
1040{
1041 const struct ddi_vbt_port_info *info =
1042 &dev_priv->vbt.ddi_port_info[port];
1043 enum port p;
1044
1045 if (!info->alternate_ddc_pin)
1046 return;
1047
1048 for_each_port_masked(p, (1 << port) - 1) {
1049 struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
1050
1051 if (info->alternate_ddc_pin != i->alternate_ddc_pin)
1052 continue;
1053
1054 DRM_DEBUG_KMS("port %c trying to use the same DDC pin (0x%x) as port %c, "
1055 "disabling port %c DVI/HDMI support\n",
1056 port_name(p), i->alternate_ddc_pin,
1057 port_name(port), port_name(p));
1058
1059 /*
1060 * If we have multiple ports supposedly sharing the
1061 * pin, then dvi/hdmi couldn't exist on the shared
1062 * port. Otherwise they share the same ddc bin and
1063 * system couldn't communicate with them separately.
1064 *
1065 * Due to parsing the ports in alphabetical order,
1066 * a higher port will always clobber a lower one.
1067 */
1068 i->supports_dvi = false;
1069 i->supports_hdmi = false;
1070 i->alternate_ddc_pin = 0;
1071 }
1072}
1073
1074static void sanitize_aux_ch(struct drm_i915_private *dev_priv,
1075 enum port port)
1076{
1077 const struct ddi_vbt_port_info *info =
1078 &dev_priv->vbt.ddi_port_info[port];
1079 enum port p;
1080
1081 if (!info->alternate_aux_channel)
1082 return;
1083
1084 for_each_port_masked(p, (1 << port) - 1) {
1085 struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
1086
1087 if (info->alternate_aux_channel != i->alternate_aux_channel)
1088 continue;
1089
1090 DRM_DEBUG_KMS("port %c trying to use the same AUX CH (0x%x) as port %c, "
1091 "disabling port %c DP support\n",
1092 port_name(p), i->alternate_aux_channel,
1093 port_name(port), port_name(p));
1094
1095 /*
1096 * If we have multiple ports supposedlt sharing the
1097 * aux channel, then DP couldn't exist on the shared
1098 * port. Otherwise they share the same aux channel
1099 * and system couldn't communicate with them separately.
1100 *
1101 * Due to parsing the ports in alphabetical order,
1102 * a higher port will always clobber a lower one.
1103 */
1104 i->supports_dp = false;
1105 i->alternate_aux_channel = 0;
1106 }
1107}
1108
1109static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
1110 const struct bdb_header *bdb)
1111{
1112 union child_device_config *it, *child = NULL;
1113 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
1114 uint8_t hdmi_level_shift;
1115 int i, j;
1116 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
1117 uint8_t aux_channel, ddc_pin;
1118 /* Each DDI port can have more than one value on the "DVO Port" field,
1119 * so look for all the possible values for each port and abort if more
1120 * than one is found. */
1121 int dvo_ports[][3] = {
1122 {DVO_PORT_HDMIA, DVO_PORT_DPA, -1},
1123 {DVO_PORT_HDMIB, DVO_PORT_DPB, -1},
1124 {DVO_PORT_HDMIC, DVO_PORT_DPC, -1},
1125 {DVO_PORT_HDMID, DVO_PORT_DPD, -1},
1126 {DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE},
1127 };
1128
1129 /* Find the child device to use, abort if more than one found. */
1130 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1131 it = dev_priv->vbt.child_dev + i;
1132
1133 for (j = 0; j < 3; j++) {
1134 if (dvo_ports[port][j] == -1)
1135 break;
1136
1137 if (it->common.dvo_port == dvo_ports[port][j]) {
1138 if (child) {
1139 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
1140 port_name(port));
1141 return;
1142 }
1143 child = it;
1144 }
1145 }
1146 }
1147 if (!child)
1148 return;
1149
1150 aux_channel = child->common.aux_channel;
1151 ddc_pin = child->common.ddc_pin;
1152
1153 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
1154 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
1155 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
1156 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
1157 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
1158
1159 info->supports_dvi = is_dvi;
1160 info->supports_hdmi = is_hdmi;
1161 info->supports_dp = is_dp;
1162
1163 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
1164 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
1165
1166 if (is_edp && is_dvi)
1167 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
1168 port_name(port));
1169 if (is_crt && port != PORT_E)
1170 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
1171 if (is_crt && (is_dvi || is_dp))
1172 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
1173 port_name(port));
1174 if (is_dvi && (port == PORT_A || port == PORT_E))
1175 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
1176 if (!is_dvi && !is_dp && !is_crt)
1177 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
1178 port_name(port));
1179 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
1180 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
1181
1182 if (is_dvi) {
1183 info->alternate_ddc_pin = ddc_pin;
1184
1185 sanitize_ddc_pin(dev_priv, port);
1186 }
1187
1188 if (is_dp) {
1189 info->alternate_aux_channel = aux_channel;
1190
1191 sanitize_aux_ch(dev_priv, port);
1192 }
1193
1194 if (bdb->version >= 158) {
1195 /* The VBT HDMI level shift values match the table we have. */
1196 hdmi_level_shift = child->raw[7] & 0xF;
1197 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1198 port_name(port),
1199 hdmi_level_shift);
1200 info->hdmi_level_shift = hdmi_level_shift;
1201 }
1202
1203 /* Parse the I_boost config for SKL and above */
1204 if (bdb->version >= 196 && child->common.iboost) {
1205 info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF);
1206 DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
1207 port_name(port), info->dp_boost_level);
1208 info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4);
1209 DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
1210 port_name(port), info->hdmi_boost_level);
1211 }
1212}
1213
1214static void parse_ddi_ports(struct drm_i915_private *dev_priv,
1215 const struct bdb_header *bdb)
1216{
1217 enum port port;
1218
1219 if (!HAS_DDI(dev_priv))
1220 return;
1221
1222 if (!dev_priv->vbt.child_dev_num)
1223 return;
1224
1225 if (bdb->version < 155)
1226 return;
1227
1228 for (port = PORT_A; port < I915_MAX_PORTS; port++)
1229 parse_ddi_port(dev_priv, port, bdb);
1230}
1231
1232static void
1233parse_device_mapping(struct drm_i915_private *dev_priv,
1234 const struct bdb_header *bdb)
1235{
1236 const struct bdb_general_definitions *p_defs;
1237 const union child_device_config *p_child;
1238 union child_device_config *child_dev_ptr;
1239 int i, child_device_num, count;
1240 u8 expected_size;
1241 u16 block_size;
1242
1243 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1244 if (!p_defs) {
1245 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1246 return;
1247 }
1248 if (bdb->version < 106) {
1249 expected_size = 22;
1250 } else if (bdb->version < 111) {
1251 expected_size = 27;
1252 } else if (bdb->version < 195) {
1253 BUILD_BUG_ON(sizeof(struct old_child_dev_config) != 33);
1254 expected_size = sizeof(struct old_child_dev_config);
1255 } else if (bdb->version == 195) {
1256 expected_size = 37;
1257 } else if (bdb->version <= 197) {
1258 expected_size = 38;
1259 } else {
1260 expected_size = 38;
1261 BUILD_BUG_ON(sizeof(*p_child) < 38);
1262 DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
1263 bdb->version, expected_size);
1264 }
1265
1266 /* Flag an error for unexpected size, but continue anyway. */
1267 if (p_defs->child_dev_size != expected_size)
1268 DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n",
1269 p_defs->child_dev_size, expected_size, bdb->version);
1270
1271 /* The legacy sized child device config is the minimum we need. */
1272 if (p_defs->child_dev_size < sizeof(struct old_child_dev_config)) {
1273 DRM_DEBUG_KMS("Child device config size %u is too small.\n",
1274 p_defs->child_dev_size);
1275 return;
1276 }
1277
1278 /* get the block size of general definitions */
1279 block_size = get_blocksize(p_defs);
1280 /* get the number of child device */
1281 child_device_num = (block_size - sizeof(*p_defs)) /
1282 p_defs->child_dev_size;
1283 count = 0;
1284 /* get the number of child device that is present */
1285 for (i = 0; i < child_device_num; i++) {
1286 p_child = child_device_ptr(p_defs, i);
1287 if (!p_child->common.device_type) {
1288 /* skip the device block if device type is invalid */
1289 continue;
1290 }
1291 count++;
1292 }
1293 if (!count) {
1294 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1295 return;
1296 }
1297 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1298 if (!dev_priv->vbt.child_dev) {
1299 DRM_DEBUG_KMS("No memory space for child device\n");
1300 return;
1301 }
1302
1303 dev_priv->vbt.child_dev_num = count;
1304 count = 0;
1305 for (i = 0; i < child_device_num; i++) {
1306 p_child = child_device_ptr(p_defs, i);
1307 if (!p_child->common.device_type) {
1308 /* skip the device block if device type is invalid */
1309 continue;
1310 }
1311
1312 child_dev_ptr = dev_priv->vbt.child_dev + count;
1313 count++;
1314
1315 /*
1316 * Copy as much as we know (sizeof) and is available
1317 * (child_dev_size) of the child device. Accessing the data must
1318 * depend on VBT version.
1319 */
1320 memcpy(child_dev_ptr, p_child,
1321 min_t(size_t, p_defs->child_dev_size, sizeof(*p_child)));
1322
1323 /*
1324 * copied full block, now init values when they are not
1325 * available in current version
1326 */
1327 if (bdb->version < 196) {
1328 /* Set default values for bits added from v196 */
1329 child_dev_ptr->common.iboost = 0;
1330 child_dev_ptr->common.hpd_invert = 0;
1331 }
1332
1333 if (bdb->version < 192)
1334 child_dev_ptr->common.lspcon = 0;
1335 }
1336 return;
1337}
1338
1339static void
1340init_vbt_defaults(struct drm_i915_private *dev_priv)
1341{
1342 enum port port;
1343
1344 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
1345
1346 /* Default to having backlight */
1347 dev_priv->vbt.backlight.present = true;
1348
1349 /* LFP panel data */
1350 dev_priv->vbt.lvds_dither = 1;
1351 dev_priv->vbt.lvds_vbt = 0;
1352
1353 /* SDVO panel data */
1354 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1355
1356 /* general features */
1357 dev_priv->vbt.int_tv_support = 1;
1358 dev_priv->vbt.int_crt_support = 1;
1359
1360 /* Default to using SSC */
1361 dev_priv->vbt.lvds_use_ssc = 1;
1362 /*
1363 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1364 * clock for LVDS.
1365 */
1366 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev_priv,
1367 !HAS_PCH_SPLIT(dev_priv));
1368 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1369
1370 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1371 struct ddi_vbt_port_info *info =
1372 &dev_priv->vbt.ddi_port_info[port];
1373
1374 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1375
1376 info->supports_dvi = (port != PORT_A && port != PORT_E);
1377 info->supports_hdmi = info->supports_dvi;
1378 info->supports_dp = (port != PORT_E);
1379 }
1380}
1381
1382static const struct bdb_header *get_bdb_header(const struct vbt_header *vbt)
1383{
1384 const void *_vbt = vbt;
1385
1386 return _vbt + vbt->bdb_offset;
1387}
1388
1389/**
1390 * intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
1391 * @buf: pointer to a buffer to validate
1392 * @size: size of the buffer
1393 *
1394 * Returns true on valid VBT.
1395 */
1396bool intel_bios_is_valid_vbt(const void *buf, size_t size)
1397{
1398 const struct vbt_header *vbt = buf;
1399 const struct bdb_header *bdb;
1400
1401 if (!vbt)
1402 return false;
1403
1404 if (sizeof(struct vbt_header) > size) {
1405 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1406 return false;
1407 }
1408
1409 if (memcmp(vbt->signature, "$VBT", 4)) {
1410 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1411 return false;
1412 }
1413
1414 if (vbt->bdb_offset + sizeof(struct bdb_header) > size) {
1415 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1416 return false;
1417 }
1418
1419 bdb = get_bdb_header(vbt);
1420 if (vbt->bdb_offset + bdb->bdb_size > size) {
1421 DRM_DEBUG_DRIVER("BDB incomplete\n");
1422 return false;
1423 }
1424
1425 return vbt;
1426}
1427
1428static const struct vbt_header *find_vbt(void __iomem *bios, size_t size)
1429{
1430 size_t i;
1431
1432 /* Scour memory looking for the VBT signature. */
1433 for (i = 0; i + 4 < size; i++) {
1434 void *vbt;
1435
1436 if (ioread32(bios + i) != *((const u32 *) "$VBT"))
1437 continue;
1438
1439 /*
1440 * This is the one place where we explicitly discard the address
1441 * space (__iomem) of the BIOS/VBT.
1442 */
1443 vbt = (void __force *) bios + i;
1444 if (intel_bios_is_valid_vbt(vbt, size - i))
1445 return vbt;
1446
1447 break;
1448 }
1449
1450 return NULL;
1451}
1452
1453/**
1454 * intel_bios_init - find VBT and initialize settings from the BIOS
1455 * @dev_priv: i915 device instance
1456 *
1457 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1458 * to appropriate values.
1459 *
1460 * Returns 0 on success, nonzero on failure.
1461 */
1462int
1463intel_bios_init(struct drm_i915_private *dev_priv)
1464{
1465 struct pci_dev *pdev = dev_priv->drm.pdev;
1466 const struct vbt_header *vbt = dev_priv->opregion.vbt;
1467 const struct bdb_header *bdb;
1468 u8 __iomem *bios = NULL;
1469
1470 if (HAS_PCH_NOP(dev_priv))
1471 return -ENODEV;
1472
1473 init_vbt_defaults(dev_priv);
1474
1475 if (!vbt) {
1476 size_t size;
1477
1478 bios = pci_map_rom(pdev, &size);
1479 if (!bios)
1480 return -1;
1481
1482 vbt = find_vbt(bios, size);
1483 if (!vbt) {
1484 pci_unmap_rom(pdev, bios);
1485 return -1;
1486 }
1487
1488 DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
1489 }
1490
1491 bdb = get_bdb_header(vbt);
1492
1493 DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
1494 (int)sizeof(vbt->signature), vbt->signature, bdb->version);
1495
1496 /* Grab useful general definitions */
1497 parse_general_features(dev_priv, bdb);
1498 parse_general_definitions(dev_priv, bdb);
1499 parse_lfp_panel_data(dev_priv, bdb);
1500 parse_lfp_backlight(dev_priv, bdb);
1501 parse_sdvo_panel_data(dev_priv, bdb);
1502 parse_sdvo_device_mapping(dev_priv, bdb);
1503 parse_device_mapping(dev_priv, bdb);
1504 parse_driver_features(dev_priv, bdb);
1505 parse_edp(dev_priv, bdb);
1506 parse_psr(dev_priv, bdb);
1507 parse_mipi_config(dev_priv, bdb);
1508 parse_mipi_sequence(dev_priv, bdb);
1509 parse_ddi_ports(dev_priv, bdb);
1510
1511 if (bios)
1512 pci_unmap_rom(pdev, bios);
1513
1514 return 0;
1515}
1516
1517/**
1518 * intel_bios_is_tv_present - is integrated TV present in VBT
1519 * @dev_priv: i915 device instance
1520 *
1521 * Return true if TV is present. If no child devices were parsed from VBT,
1522 * assume TV is present.
1523 */
1524bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv)
1525{
1526 union child_device_config *p_child;
1527 int i;
1528
1529 if (!dev_priv->vbt.int_tv_support)
1530 return false;
1531
1532 if (!dev_priv->vbt.child_dev_num)
1533 return true;
1534
1535 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1536 p_child = dev_priv->vbt.child_dev + i;
1537 /*
1538 * If the device type is not TV, continue.
1539 */
1540 switch (p_child->old.device_type) {
1541 case DEVICE_TYPE_INT_TV:
1542 case DEVICE_TYPE_TV:
1543 case DEVICE_TYPE_TV_SVIDEO_COMPOSITE:
1544 break;
1545 default:
1546 continue;
1547 }
1548 /* Only when the addin_offset is non-zero, it is regarded
1549 * as present.
1550 */
1551 if (p_child->old.addin_offset)
1552 return true;
1553 }
1554
1555 return false;
1556}
1557
1558/**
1559 * intel_bios_is_lvds_present - is LVDS present in VBT
1560 * @dev_priv: i915 device instance
1561 * @i2c_pin: i2c pin for LVDS if present
1562 *
1563 * Return true if LVDS is present. If no child devices were parsed from VBT,
1564 * assume LVDS is present.
1565 */
1566bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin)
1567{
1568 int i;
1569
1570 if (!dev_priv->vbt.child_dev_num)
1571 return true;
1572
1573 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1574 union child_device_config *uchild = dev_priv->vbt.child_dev + i;
1575 struct old_child_dev_config *child = &uchild->old;
1576
1577 /* If the device type is not LFP, continue.
1578 * We have to check both the new identifiers as well as the
1579 * old for compatibility with some BIOSes.
1580 */
1581 if (child->device_type != DEVICE_TYPE_INT_LFP &&
1582 child->device_type != DEVICE_TYPE_LFP)
1583 continue;
1584
1585 if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
1586 *i2c_pin = child->i2c_pin;
1587
1588 /* However, we cannot trust the BIOS writers to populate
1589 * the VBT correctly. Since LVDS requires additional
1590 * information from AIM blocks, a non-zero addin offset is
1591 * a good indicator that the LVDS is actually present.
1592 */
1593 if (child->addin_offset)
1594 return true;
1595
1596 /* But even then some BIOS writers perform some black magic
1597 * and instantiate the device without reference to any
1598 * additional data. Trust that if the VBT was written into
1599 * the OpRegion then they have validated the LVDS's existence.
1600 */
1601 if (dev_priv->opregion.vbt)
1602 return true;
1603 }
1604
1605 return false;
1606}
1607
1608/**
1609 * intel_bios_is_port_present - is the specified digital port present
1610 * @dev_priv: i915 device instance
1611 * @port: port to check
1612 *
1613 * Return true if the device in %port is present.
1614 */
1615bool intel_bios_is_port_present(struct drm_i915_private *dev_priv, enum port port)
1616{
1617 static const struct {
1618 u16 dp, hdmi;
1619 } port_mapping[] = {
1620 [PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },
1621 [PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },
1622 [PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },
1623 [PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },
1624 };
1625 int i;
1626
1627 /* FIXME maybe deal with port A as well? */
1628 if (WARN_ON(port == PORT_A) || port >= ARRAY_SIZE(port_mapping))
1629 return false;
1630
1631 if (!dev_priv->vbt.child_dev_num)
1632 return false;
1633
1634 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1635 const union child_device_config *p_child =
1636 &dev_priv->vbt.child_dev[i];
1637 if ((p_child->common.dvo_port == port_mapping[port].dp ||
1638 p_child->common.dvo_port == port_mapping[port].hdmi) &&
1639 (p_child->common.device_type & (DEVICE_TYPE_TMDS_DVI_SIGNALING |
1640 DEVICE_TYPE_DISPLAYPORT_OUTPUT)))
1641 return true;
1642 }
1643
1644 return false;
1645}
1646
1647/**
1648 * intel_bios_is_port_edp - is the device in given port eDP
1649 * @dev_priv: i915 device instance
1650 * @port: port to check
1651 *
1652 * Return true if the device in %port is eDP.
1653 */
1654bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
1655{
1656 union child_device_config *p_child;
1657 static const short port_mapping[] = {
1658 [PORT_B] = DVO_PORT_DPB,
1659 [PORT_C] = DVO_PORT_DPC,
1660 [PORT_D] = DVO_PORT_DPD,
1661 [PORT_E] = DVO_PORT_DPE,
1662 };
1663 int i;
1664
1665 if (!dev_priv->vbt.child_dev_num)
1666 return false;
1667
1668 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1669 p_child = dev_priv->vbt.child_dev + i;
1670
1671 if (p_child->common.dvo_port == port_mapping[port] &&
1672 (p_child->common.device_type & DEVICE_TYPE_eDP_BITS) ==
1673 (DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS))
1674 return true;
1675 }
1676
1677 return false;
1678}
1679
1680static bool child_dev_is_dp_dual_mode(const union child_device_config *p_child,
1681 enum port port)
1682{
1683 static const struct {
1684 u16 dp, hdmi;
1685 } port_mapping[] = {
1686 /*
1687 * Buggy VBTs may declare DP ports as having
1688 * HDMI type dvo_port :( So let's check both.
1689 */
1690 [PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },
1691 [PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },
1692 [PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },
1693 [PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },
1694 };
1695
1696 if (port == PORT_A || port >= ARRAY_SIZE(port_mapping))
1697 return false;
1698
1699 if ((p_child->common.device_type & DEVICE_TYPE_DP_DUAL_MODE_BITS) !=
1700 (DEVICE_TYPE_DP_DUAL_MODE & DEVICE_TYPE_DP_DUAL_MODE_BITS))
1701 return false;
1702
1703 if (p_child->common.dvo_port == port_mapping[port].dp)
1704 return true;
1705
1706 /* Only accept a HDMI dvo_port as DP++ if it has an AUX channel */
1707 if (p_child->common.dvo_port == port_mapping[port].hdmi &&
1708 p_child->common.aux_channel != 0)
1709 return true;
1710
1711 return false;
1712}
1713
1714bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *dev_priv,
1715 enum port port)
1716{
1717 int i;
1718
1719 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1720 const union child_device_config *p_child =
1721 &dev_priv->vbt.child_dev[i];
1722
1723 if (child_dev_is_dp_dual_mode(p_child, port))
1724 return true;
1725 }
1726
1727 return false;
1728}
1729
1730/**
1731 * intel_bios_is_dsi_present - is DSI present in VBT
1732 * @dev_priv: i915 device instance
1733 * @port: port for DSI if present
1734 *
1735 * Return true if DSI is present, and return the port in %port.
1736 */
1737bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
1738 enum port *port)
1739{
1740 union child_device_config *p_child;
1741 u8 dvo_port;
1742 int i;
1743
1744 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1745 p_child = dev_priv->vbt.child_dev + i;
1746
1747 if (!(p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT))
1748 continue;
1749
1750 dvo_port = p_child->common.dvo_port;
1751
1752 switch (dvo_port) {
1753 case DVO_PORT_MIPIA:
1754 case DVO_PORT_MIPIC:
1755 if (port)
1756 *port = dvo_port - DVO_PORT_MIPIA;
1757 return true;
1758 case DVO_PORT_MIPIB:
1759 case DVO_PORT_MIPID:
1760 DRM_DEBUG_KMS("VBT has unsupported DSI port %c\n",
1761 port_name(dvo_port - DVO_PORT_MIPIA));
1762 break;
1763 }
1764 }
1765
1766 return false;
1767}
1768
1769/**
1770 * intel_bios_is_port_hpd_inverted - is HPD inverted for %port
1771 * @dev_priv: i915 device instance
1772 * @port: port to check
1773 *
1774 * Return true if HPD should be inverted for %port.
1775 */
1776bool
1777intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
1778 enum port port)
1779{
1780 int i;
1781
1782 if (WARN_ON_ONCE(!IS_BROXTON(dev_priv)))
1783 return false;
1784
1785 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1786 if (!dev_priv->vbt.child_dev[i].common.hpd_invert)
1787 continue;
1788
1789 switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
1790 case DVO_PORT_DPA:
1791 case DVO_PORT_HDMIA:
1792 if (port == PORT_A)
1793 return true;
1794 break;
1795 case DVO_PORT_DPB:
1796 case DVO_PORT_HDMIB:
1797 if (port == PORT_B)
1798 return true;
1799 break;
1800 case DVO_PORT_DPC:
1801 case DVO_PORT_HDMIC:
1802 if (port == PORT_C)
1803 return true;
1804 break;
1805 default:
1806 break;
1807 }
1808 }
1809
1810 return false;
1811}
1812
1813/**
1814 * intel_bios_is_lspcon_present - if LSPCON is attached on %port
1815 * @dev_priv: i915 device instance
1816 * @port: port to check
1817 *
1818 * Return true if LSPCON is present on this port
1819 */
1820bool
1821intel_bios_is_lspcon_present(struct drm_i915_private *dev_priv,
1822 enum port port)
1823{
1824 int i;
1825
1826 if (!HAS_LSPCON(dev_priv))
1827 return false;
1828
1829 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1830 if (!dev_priv->vbt.child_dev[i].common.lspcon)
1831 continue;
1832
1833 switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
1834 case DVO_PORT_DPA:
1835 case DVO_PORT_HDMIA:
1836 if (port == PORT_A)
1837 return true;
1838 break;
1839 case DVO_PORT_DPB:
1840 case DVO_PORT_HDMIB:
1841 if (port == PORT_B)
1842 return true;
1843 break;
1844 case DVO_PORT_DPC:
1845 case DVO_PORT_HDMIC:
1846 if (port == PORT_C)
1847 return true;
1848 break;
1849 case DVO_PORT_DPD:
1850 case DVO_PORT_HDMID:
1851 if (port == PORT_D)
1852 return true;
1853 break;
1854 default:
1855 break;
1856 }
1857 }
1858
1859 return false;
1860}