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 const void *
find_section(const void * _bdb,int section_id)40 find_section(const void *_bdb, int section_id)
41 {
42 const struct bdb_header *bdb = _bdb;
43 const u8 *base = _bdb;
44 int index = 0;
45 u32 total, current_size;
46 u8 current_id;
47
48 /* skip to first section */
49 index += bdb->header_size;
50 total = bdb->bdb_size;
51
52 /* walk the sections looking for section_id */
53 while (index + 3 < total) {
54 current_id = *(base + index);
55 index++;
56
57 current_size = *((const u16 *)(base + index));
58 index += 2;
59
60 /* The MIPI Sequence Block v3+ has a separate size field. */
61 if (current_id == BDB_MIPI_SEQUENCE && *(base + index) >= 3)
62 current_size = *((const u32 *)(base + index + 1));
63
64 if (index + current_size > total)
65 return NULL;
66
67 if (current_id == section_id)
68 return base + index;
69
70 index += current_size;
71 }
72
73 return NULL;
74 }
75
76 static u16
get_blocksize(const void * p)77 get_blocksize(const void *p)
78 {
79 u16 *block_ptr, block_size;
80
81 block_ptr = (u16 *)((char *)p - 2);
82 block_size = *block_ptr;
83 return block_size;
84 }
85
86 static void
fill_detail_timing_data(struct drm_display_mode * panel_fixed_mode,const struct lvds_dvo_timing * dvo_timing)87 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
88 const struct lvds_dvo_timing *dvo_timing)
89 {
90 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
91 dvo_timing->hactive_lo;
92 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
93 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
94 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
95 dvo_timing->hsync_pulse_width;
96 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
97 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
98
99 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
100 dvo_timing->vactive_lo;
101 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
102 dvo_timing->vsync_off;
103 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
104 dvo_timing->vsync_pulse_width;
105 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
106 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
107 panel_fixed_mode->clock = dvo_timing->clock * 10;
108 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
109
110 if (dvo_timing->hsync_positive)
111 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
112 else
113 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
114
115 if (dvo_timing->vsync_positive)
116 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
117 else
118 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
119
120 /* Some VBTs have bogus h/vtotal values */
121 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
122 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
123 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
124 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
125
126 drm_mode_set_name(panel_fixed_mode);
127 }
128
129 static const struct lvds_dvo_timing *
get_lvds_dvo_timing(const struct bdb_lvds_lfp_data * lvds_lfp_data,const struct bdb_lvds_lfp_data_ptrs * lvds_lfp_data_ptrs,int index)130 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
131 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
132 int index)
133 {
134 /*
135 * the size of fp_timing varies on the different platform.
136 * So calculate the DVO timing relative offset in LVDS data
137 * entry to get the DVO timing entry
138 */
139
140 int lfp_data_size =
141 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
142 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
143 int dvo_timing_offset =
144 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
145 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
146 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
147
148 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
149 }
150
151 /* get lvds_fp_timing entry
152 * this function may return NULL if the corresponding entry is invalid
153 */
154 static const struct lvds_fp_timing *
get_lvds_fp_timing(const struct bdb_header * bdb,const struct bdb_lvds_lfp_data * data,const struct bdb_lvds_lfp_data_ptrs * ptrs,int index)155 get_lvds_fp_timing(const struct bdb_header *bdb,
156 const struct bdb_lvds_lfp_data *data,
157 const struct bdb_lvds_lfp_data_ptrs *ptrs,
158 int index)
159 {
160 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
161 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
162 size_t ofs;
163
164 if (index >= ARRAY_SIZE(ptrs->ptr))
165 return NULL;
166 ofs = ptrs->ptr[index].fp_timing_offset;
167 if (ofs < data_ofs ||
168 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
169 return NULL;
170 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
171 }
172
173 /* Try to find integrated panel data */
174 static void
parse_lfp_panel_data(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)175 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
176 const struct bdb_header *bdb)
177 {
178 const struct bdb_lvds_options *lvds_options;
179 const struct bdb_lvds_lfp_data *lvds_lfp_data;
180 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
181 const struct lvds_dvo_timing *panel_dvo_timing;
182 const struct lvds_fp_timing *fp_timing;
183 struct drm_display_mode *panel_fixed_mode;
184 int drrs_mode;
185
186 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
187 if (!lvds_options)
188 return;
189
190 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
191 if (lvds_options->panel_type == 0xff)
192 return;
193
194 panel_type = lvds_options->panel_type;
195
196 drrs_mode = (lvds_options->dps_panel_type_bits
197 >> (panel_type * 2)) & MODE_MASK;
198 /*
199 * VBT has static DRRS = 0 and seamless DRRS = 2.
200 * The below piece of code is required to adjust vbt.drrs_type
201 * to match the enum drrs_support_type.
202 */
203 switch (drrs_mode) {
204 case 0:
205 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
206 DRM_DEBUG_KMS("DRRS supported mode is static\n");
207 break;
208 case 2:
209 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
210 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
211 break;
212 default:
213 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
214 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
215 break;
216 }
217
218 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
219 if (!lvds_lfp_data)
220 return;
221
222 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
223 if (!lvds_lfp_data_ptrs)
224 return;
225
226 dev_priv->vbt.lvds_vbt = 1;
227
228 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
229 lvds_lfp_data_ptrs,
230 lvds_options->panel_type);
231
232 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
233 if (!panel_fixed_mode)
234 return;
235
236 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
237
238 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
239
240 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
241 drm_mode_debug_printmodeline(panel_fixed_mode);
242
243 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
244 lvds_lfp_data_ptrs,
245 lvds_options->panel_type);
246 if (fp_timing) {
247 /* check the resolution, just to be sure */
248 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
249 fp_timing->y_res == panel_fixed_mode->vdisplay) {
250 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
251 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
252 dev_priv->vbt.bios_lvds_val);
253 }
254 }
255 }
256
257 static void
parse_lfp_backlight(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)258 parse_lfp_backlight(struct drm_i915_private *dev_priv,
259 const struct bdb_header *bdb)
260 {
261 const struct bdb_lfp_backlight_data *backlight_data;
262 const struct bdb_lfp_backlight_data_entry *entry;
263
264 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
265 if (!backlight_data)
266 return;
267
268 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
269 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
270 backlight_data->entry_size);
271 return;
272 }
273
274 entry = &backlight_data->data[panel_type];
275
276 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
277 if (!dev_priv->vbt.backlight.present) {
278 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
279 entry->type);
280 return;
281 }
282
283 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
284 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
285 dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
286 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
287 "active %s, min brightness %u, level %u\n",
288 dev_priv->vbt.backlight.pwm_freq_hz,
289 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
290 dev_priv->vbt.backlight.min_brightness,
291 backlight_data->level[panel_type]);
292 }
293
294 /* Try to find sdvo panel data */
295 static void
parse_sdvo_panel_data(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)296 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
297 const struct bdb_header *bdb)
298 {
299 const struct lvds_dvo_timing *dvo_timing;
300 struct drm_display_mode *panel_fixed_mode;
301 int index;
302
303 index = i915.vbt_sdvo_panel_type;
304 if (index == -2) {
305 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
306 return;
307 }
308
309 if (index == -1) {
310 const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
311
312 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
313 if (!sdvo_lvds_options)
314 return;
315
316 index = sdvo_lvds_options->panel_type;
317 }
318
319 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
320 if (!dvo_timing)
321 return;
322
323 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
324 if (!panel_fixed_mode)
325 return;
326
327 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
328
329 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
330
331 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
332 drm_mode_debug_printmodeline(panel_fixed_mode);
333 }
334
intel_bios_ssc_frequency(struct drm_device * dev,bool alternate)335 static int intel_bios_ssc_frequency(struct drm_device *dev,
336 bool alternate)
337 {
338 switch (INTEL_INFO(dev)->gen) {
339 case 2:
340 return alternate ? 66667 : 48000;
341 case 3:
342 case 4:
343 return alternate ? 100000 : 96000;
344 default:
345 return alternate ? 100000 : 120000;
346 }
347 }
348
349 static void
parse_general_features(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)350 parse_general_features(struct drm_i915_private *dev_priv,
351 const struct bdb_header *bdb)
352 {
353 struct drm_device *dev = dev_priv->dev;
354 const struct bdb_general_features *general;
355
356 general = find_section(bdb, BDB_GENERAL_FEATURES);
357 if (general) {
358 dev_priv->vbt.int_tv_support = general->int_tv_support;
359 dev_priv->vbt.int_crt_support = general->int_crt_support;
360 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
361 dev_priv->vbt.lvds_ssc_freq =
362 intel_bios_ssc_frequency(dev, general->ssc_freq);
363 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
364 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
365 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",
366 dev_priv->vbt.int_tv_support,
367 dev_priv->vbt.int_crt_support,
368 dev_priv->vbt.lvds_use_ssc,
369 dev_priv->vbt.lvds_ssc_freq,
370 dev_priv->vbt.display_clock_mode,
371 dev_priv->vbt.fdi_rx_polarity_inverted);
372 }
373 }
374
375 static void
parse_general_definitions(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)376 parse_general_definitions(struct drm_i915_private *dev_priv,
377 const struct bdb_header *bdb)
378 {
379 const struct bdb_general_definitions *general;
380
381 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
382 if (general) {
383 u16 block_size = get_blocksize(general);
384 if (block_size >= sizeof(*general)) {
385 int bus_pin = general->crt_ddc_gmbus_pin;
386 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
387 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
388 dev_priv->vbt.crt_ddc_pin = bus_pin;
389 } else {
390 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
391 block_size);
392 }
393 }
394 }
395
396 static const union child_device_config *
child_device_ptr(const struct bdb_general_definitions * p_defs,int i)397 child_device_ptr(const struct bdb_general_definitions *p_defs, int i)
398 {
399 return (const void *) &p_defs->devices[i * p_defs->child_dev_size];
400 }
401
402 static void
parse_sdvo_device_mapping(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)403 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
404 const struct bdb_header *bdb)
405 {
406 struct sdvo_device_mapping *p_mapping;
407 const struct bdb_general_definitions *p_defs;
408 const struct old_child_dev_config *child; /* legacy */
409 int i, child_device_num, count;
410 u16 block_size;
411
412 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
413 if (!p_defs) {
414 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
415 return;
416 }
417
418 /*
419 * Only parse SDVO mappings when the general definitions block child
420 * device size matches that of the *legacy* child device config
421 * struct. Thus, SDVO mapping will be skipped for newer VBT.
422 */
423 if (p_defs->child_dev_size != sizeof(*child)) {
424 DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n");
425 return;
426 }
427 /* get the block size of general definitions */
428 block_size = get_blocksize(p_defs);
429 /* get the number of child device */
430 child_device_num = (block_size - sizeof(*p_defs)) /
431 p_defs->child_dev_size;
432 count = 0;
433 for (i = 0; i < child_device_num; i++) {
434 child = &child_device_ptr(p_defs, i)->old;
435 if (!child->device_type) {
436 /* skip the device block if device type is invalid */
437 continue;
438 }
439 if (child->slave_addr != SLAVE_ADDR1 &&
440 child->slave_addr != SLAVE_ADDR2) {
441 /*
442 * If the slave address is neither 0x70 nor 0x72,
443 * it is not a SDVO device. Skip it.
444 */
445 continue;
446 }
447 if (child->dvo_port != DEVICE_PORT_DVOB &&
448 child->dvo_port != DEVICE_PORT_DVOC) {
449 /* skip the incorrect SDVO port */
450 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
451 continue;
452 }
453 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
454 " %s port\n",
455 child->slave_addr,
456 (child->dvo_port == DEVICE_PORT_DVOB) ?
457 "SDVOB" : "SDVOC");
458 p_mapping = &(dev_priv->sdvo_mappings[child->dvo_port - 1]);
459 if (!p_mapping->initialized) {
460 p_mapping->dvo_port = child->dvo_port;
461 p_mapping->slave_addr = child->slave_addr;
462 p_mapping->dvo_wiring = child->dvo_wiring;
463 p_mapping->ddc_pin = child->ddc_pin;
464 p_mapping->i2c_pin = child->i2c_pin;
465 p_mapping->initialized = 1;
466 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
467 p_mapping->dvo_port,
468 p_mapping->slave_addr,
469 p_mapping->dvo_wiring,
470 p_mapping->ddc_pin,
471 p_mapping->i2c_pin);
472 } else {
473 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
474 "two SDVO device.\n");
475 }
476 if (child->slave2_addr) {
477 /* Maybe this is a SDVO device with multiple inputs */
478 /* And the mapping info is not added */
479 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
480 " is a SDVO device with multiple inputs.\n");
481 }
482 count++;
483 }
484
485 if (!count) {
486 /* No SDVO device info is found */
487 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
488 }
489 return;
490 }
491
492 static void
parse_driver_features(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)493 parse_driver_features(struct drm_i915_private *dev_priv,
494 const struct bdb_header *bdb)
495 {
496 const struct bdb_driver_features *driver;
497
498 driver = find_section(bdb, BDB_DRIVER_FEATURES);
499 if (!driver)
500 return;
501
502 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
503 dev_priv->vbt.edp_support = 1;
504
505 if (driver->dual_frequency)
506 dev_priv->render_reclock_avail = true;
507
508 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
509 /*
510 * If DRRS is not supported, drrs_type has to be set to 0.
511 * This is because, VBT is configured in such a way that
512 * static DRRS is 0 and DRRS not supported is represented by
513 * driver->drrs_enabled=false
514 */
515 if (!driver->drrs_enabled)
516 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
517 }
518
519 static void
parse_edp(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)520 parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
521 {
522 const struct bdb_edp *edp;
523 const struct edp_power_seq *edp_pps;
524 const struct edp_link_params *edp_link_params;
525
526 edp = find_section(bdb, BDB_EDP);
527 if (!edp) {
528 if (dev_priv->vbt.edp_support)
529 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
530 return;
531 }
532
533 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
534 case EDP_18BPP:
535 dev_priv->vbt.edp_bpp = 18;
536 break;
537 case EDP_24BPP:
538 dev_priv->vbt.edp_bpp = 24;
539 break;
540 case EDP_30BPP:
541 dev_priv->vbt.edp_bpp = 30;
542 break;
543 }
544
545 /* Get the eDP sequencing and link info */
546 edp_pps = &edp->power_seqs[panel_type];
547 edp_link_params = &edp->link_params[panel_type];
548
549 dev_priv->vbt.edp_pps = *edp_pps;
550
551 switch (edp_link_params->rate) {
552 case EDP_RATE_1_62:
553 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
554 break;
555 case EDP_RATE_2_7:
556 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
557 break;
558 default:
559 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
560 edp_link_params->rate);
561 break;
562 }
563
564 switch (edp_link_params->lanes) {
565 case EDP_LANE_1:
566 dev_priv->vbt.edp_lanes = 1;
567 break;
568 case EDP_LANE_2:
569 dev_priv->vbt.edp_lanes = 2;
570 break;
571 case EDP_LANE_4:
572 dev_priv->vbt.edp_lanes = 4;
573 break;
574 default:
575 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
576 edp_link_params->lanes);
577 break;
578 }
579
580 switch (edp_link_params->preemphasis) {
581 case EDP_PREEMPHASIS_NONE:
582 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
583 break;
584 case EDP_PREEMPHASIS_3_5dB:
585 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
586 break;
587 case EDP_PREEMPHASIS_6dB:
588 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
589 break;
590 case EDP_PREEMPHASIS_9_5dB:
591 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
592 break;
593 default:
594 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
595 edp_link_params->preemphasis);
596 break;
597 }
598
599 switch (edp_link_params->vswing) {
600 case EDP_VSWING_0_4V:
601 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
602 break;
603 case EDP_VSWING_0_6V:
604 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
605 break;
606 case EDP_VSWING_0_8V:
607 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
608 break;
609 case EDP_VSWING_1_2V:
610 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
611 break;
612 default:
613 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
614 edp_link_params->vswing);
615 break;
616 }
617
618 if (bdb->version >= 173) {
619 uint8_t vswing;
620
621 /* Don't read from VBT if module parameter has valid value*/
622 if (i915.edp_vswing) {
623 dev_priv->edp_low_vswing = i915.edp_vswing == 1;
624 } else {
625 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
626 dev_priv->edp_low_vswing = vswing == 0;
627 }
628 }
629 }
630
631 static void
parse_psr(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)632 parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
633 {
634 const struct bdb_psr *psr;
635 const struct psr_table *psr_table;
636
637 psr = find_section(bdb, BDB_PSR);
638 if (!psr) {
639 DRM_DEBUG_KMS("No PSR BDB found.\n");
640 return;
641 }
642
643 psr_table = &psr->psr_table[panel_type];
644
645 dev_priv->vbt.psr.full_link = psr_table->full_link;
646 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
647
648 /* Allowed VBT values goes from 0 to 15 */
649 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
650 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
651
652 switch (psr_table->lines_to_wait) {
653 case 0:
654 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
655 break;
656 case 1:
657 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
658 break;
659 case 2:
660 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
661 break;
662 case 3:
663 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
664 break;
665 default:
666 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
667 psr_table->lines_to_wait);
668 break;
669 }
670
671 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
672 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
673 }
674
goto_next_sequence(u8 * data,int * size)675 static u8 *goto_next_sequence(u8 *data, int *size)
676 {
677 u16 len;
678 int tmp = *size;
679
680 if (--tmp < 0)
681 return NULL;
682
683 /* goto first element */
684 data++;
685 while (1) {
686 switch (*data) {
687 case MIPI_SEQ_ELEM_SEND_PKT:
688 /*
689 * skip by this element payload size
690 * skip elem id, command flag and data type
691 */
692 tmp -= 5;
693 if (tmp < 0)
694 return NULL;
695
696 data += 3;
697 len = *((u16 *)data);
698
699 tmp -= len;
700 if (tmp < 0)
701 return NULL;
702
703 /* skip by len */
704 data = data + 2 + len;
705 break;
706 case MIPI_SEQ_ELEM_DELAY:
707 /* skip by elem id, and delay is 4 bytes */
708 tmp -= 5;
709 if (tmp < 0)
710 return NULL;
711
712 data += 5;
713 break;
714 case MIPI_SEQ_ELEM_GPIO:
715 tmp -= 3;
716 if (tmp < 0)
717 return NULL;
718
719 data += 3;
720 break;
721 default:
722 DRM_ERROR("Unknown element\n");
723 return NULL;
724 }
725
726 /* end of sequence ? */
727 if (*data == 0)
728 break;
729 }
730
731 /* goto next sequence or end of block byte */
732 if (--tmp < 0)
733 return NULL;
734
735 data++;
736
737 /* update amount of data left for the sequence block to be parsed */
738 *size = tmp;
739 return data;
740 }
741
742 static void
parse_mipi(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)743 parse_mipi(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
744 {
745 const struct bdb_mipi_config *start;
746 const struct bdb_mipi_sequence *sequence;
747 const struct mipi_config *config;
748 const struct mipi_pps_data *pps;
749 u8 *data;
750 const u8 *seq_data;
751 int i, panel_id, seq_size;
752 u16 block_size;
753
754 /* parse MIPI blocks only if LFP type is MIPI */
755 if (!dev_priv->vbt.has_mipi)
756 return;
757
758 /* Initialize this to undefined indicating no generic MIPI support */
759 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
760
761 /* Block #40 is already parsed and panel_fixed_mode is
762 * stored in dev_priv->lfp_lvds_vbt_mode
763 * resuse this when needed
764 */
765
766 /* Parse #52 for panel index used from panel_type already
767 * parsed
768 */
769 start = find_section(bdb, BDB_MIPI_CONFIG);
770 if (!start) {
771 DRM_DEBUG_KMS("No MIPI config BDB found");
772 return;
773 }
774
775 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
776 panel_type);
777
778 /*
779 * get hold of the correct configuration block and pps data as per
780 * the panel_type as index
781 */
782 config = &start->config[panel_type];
783 pps = &start->pps[panel_type];
784
785 /* store as of now full data. Trim when we realise all is not needed */
786 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
787 if (!dev_priv->vbt.dsi.config)
788 return;
789
790 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
791 if (!dev_priv->vbt.dsi.pps) {
792 kfree(dev_priv->vbt.dsi.config);
793 return;
794 }
795
796 /* We have mandatory mipi config blocks. Initialize as generic panel */
797 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
798
799 /* Check if we have sequence block as well */
800 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
801 if (!sequence) {
802 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
803 return;
804 }
805
806 /* Fail gracefully for forward incompatible sequence block. */
807 if (sequence->version >= 3) {
808 DRM_ERROR("Unable to parse MIPI Sequence Block v3+\n");
809 return;
810 }
811
812 DRM_DEBUG_DRIVER("Found MIPI sequence block\n");
813
814 block_size = get_blocksize(sequence);
815
816 /*
817 * parse the sequence block for individual sequences
818 */
819 dev_priv->vbt.dsi.seq_version = sequence->version;
820
821 seq_data = &sequence->data[0];
822
823 /*
824 * sequence block is variable length and hence we need to parse and
825 * get the sequence data for specific panel id
826 */
827 for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) {
828 panel_id = *seq_data;
829 seq_size = *((u16 *) (seq_data + 1));
830 if (panel_id == panel_type)
831 break;
832
833 /* skip the sequence including seq header of 3 bytes */
834 seq_data = seq_data + 3 + seq_size;
835 if ((seq_data - &sequence->data[0]) > block_size) {
836 DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n");
837 return;
838 }
839 }
840
841 if (i == MAX_MIPI_CONFIGURATIONS) {
842 DRM_ERROR("Sequence block detected but no valid configuration\n");
843 return;
844 }
845
846 /* check if found sequence is completely within the sequence block
847 * just being paranoid */
848 if (seq_size > block_size) {
849 DRM_ERROR("Corrupted sequence/size, bailing out\n");
850 return;
851 }
852
853 /* skip the panel id(1 byte) and seq size(2 bytes) */
854 dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL);
855 if (!dev_priv->vbt.dsi.data)
856 return;
857
858 /*
859 * loop into the sequence data and split into multiple sequneces
860 * There are only 5 types of sequences as of now
861 */
862 data = dev_priv->vbt.dsi.data;
863 dev_priv->vbt.dsi.size = seq_size;
864
865 /* two consecutive 0x00 indicate end of all sequences */
866 while (1) {
867 int seq_id = *data;
868 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) {
869 dev_priv->vbt.dsi.sequence[seq_id] = data;
870 DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id);
871 } else {
872 DRM_ERROR("undefined sequence\n");
873 goto err;
874 }
875
876 /* partial parsing to skip elements */
877 data = goto_next_sequence(data, &seq_size);
878
879 if (data == NULL) {
880 DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n");
881 goto err;
882 }
883
884 if (*data == 0)
885 break; /* end of sequence reached */
886 }
887
888 DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n");
889 return;
890 err:
891 kfree(dev_priv->vbt.dsi.data);
892 dev_priv->vbt.dsi.data = NULL;
893
894 /* error during parsing so set all pointers to null
895 * because of partial parsing */
896 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
897 }
898
translate_iboost(u8 val)899 static u8 translate_iboost(u8 val)
900 {
901 static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
902
903 if (val >= ARRAY_SIZE(mapping)) {
904 DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
905 return 0;
906 }
907 return mapping[val];
908 }
909
parse_ddi_port(struct drm_i915_private * dev_priv,enum port port,const struct bdb_header * bdb)910 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
911 const struct bdb_header *bdb)
912 {
913 union child_device_config *it, *child = NULL;
914 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
915 uint8_t hdmi_level_shift;
916 int i, j;
917 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
918 uint8_t aux_channel, ddc_pin;
919 /* Each DDI port can have more than one value on the "DVO Port" field,
920 * so look for all the possible values for each port and abort if more
921 * than one is found. */
922 int dvo_ports[][3] = {
923 {DVO_PORT_HDMIA, DVO_PORT_DPA, -1},
924 {DVO_PORT_HDMIB, DVO_PORT_DPB, -1},
925 {DVO_PORT_HDMIC, DVO_PORT_DPC, -1},
926 {DVO_PORT_HDMID, DVO_PORT_DPD, -1},
927 {DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE},
928 };
929
930 /* Find the child device to use, abort if more than one found. */
931 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
932 it = dev_priv->vbt.child_dev + i;
933
934 for (j = 0; j < 3; j++) {
935 if (dvo_ports[port][j] == -1)
936 break;
937
938 if (it->common.dvo_port == dvo_ports[port][j]) {
939 if (child) {
940 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
941 port_name(port));
942 return;
943 }
944 child = it;
945 }
946 }
947 }
948 if (!child)
949 return;
950
951 aux_channel = child->raw[25];
952 ddc_pin = child->common.ddc_pin;
953
954 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
955 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
956 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
957 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
958 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
959
960 info->supports_dvi = is_dvi;
961 info->supports_hdmi = is_hdmi;
962 info->supports_dp = is_dp;
963
964 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
965 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
966
967 if (is_edp && is_dvi)
968 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
969 port_name(port));
970 if (is_crt && port != PORT_E)
971 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
972 if (is_crt && (is_dvi || is_dp))
973 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
974 port_name(port));
975 if (is_dvi && (port == PORT_A || port == PORT_E))
976 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
977 if (!is_dvi && !is_dp && !is_crt)
978 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
979 port_name(port));
980 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
981 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
982
983 if (is_dvi) {
984 if (port == PORT_E) {
985 info->alternate_ddc_pin = ddc_pin;
986 /* if DDIE share ddc pin with other port, then
987 * dvi/hdmi couldn't exist on the shared port.
988 * Otherwise they share the same ddc bin and system
989 * couldn't communicate with them seperately. */
990 if (ddc_pin == DDC_PIN_B) {
991 dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
992 dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
993 } else if (ddc_pin == DDC_PIN_C) {
994 dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
995 dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
996 } else if (ddc_pin == DDC_PIN_D) {
997 dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
998 dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
999 }
1000 } else if (ddc_pin == DDC_PIN_B && port != PORT_B)
1001 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
1002 else if (ddc_pin == DDC_PIN_C && port != PORT_C)
1003 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
1004 else if (ddc_pin == DDC_PIN_D && port != PORT_D)
1005 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
1006 }
1007
1008 if (is_dp) {
1009 if (port == PORT_E) {
1010 info->alternate_aux_channel = aux_channel;
1011 /* if DDIE share aux channel with other port, then
1012 * DP couldn't exist on the shared port. Otherwise
1013 * they share the same aux channel and system
1014 * couldn't communicate with them seperately. */
1015 if (aux_channel == DP_AUX_A)
1016 dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0;
1017 else if (aux_channel == DP_AUX_B)
1018 dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0;
1019 else if (aux_channel == DP_AUX_C)
1020 dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0;
1021 else if (aux_channel == DP_AUX_D)
1022 dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0;
1023 }
1024 else if (aux_channel == DP_AUX_A && port != PORT_A)
1025 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
1026 else if (aux_channel == DP_AUX_B && port != PORT_B)
1027 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
1028 else if (aux_channel == DP_AUX_C && port != PORT_C)
1029 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
1030 else if (aux_channel == DP_AUX_D && port != PORT_D)
1031 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
1032 }
1033
1034 if (bdb->version >= 158) {
1035 /* The VBT HDMI level shift values match the table we have. */
1036 hdmi_level_shift = child->raw[7] & 0xF;
1037 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1038 port_name(port),
1039 hdmi_level_shift);
1040 info->hdmi_level_shift = hdmi_level_shift;
1041 }
1042
1043 /* Parse the I_boost config for SKL and above */
1044 if (bdb->version >= 196 && (child->common.flags_1 & IBOOST_ENABLE)) {
1045 info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF);
1046 DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
1047 port_name(port), info->dp_boost_level);
1048 info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4);
1049 DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
1050 port_name(port), info->hdmi_boost_level);
1051 }
1052 }
1053
parse_ddi_ports(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)1054 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
1055 const struct bdb_header *bdb)
1056 {
1057 struct drm_device *dev = dev_priv->dev;
1058 enum port port;
1059
1060 if (!HAS_DDI(dev))
1061 return;
1062
1063 if (!dev_priv->vbt.child_dev_num)
1064 return;
1065
1066 if (bdb->version < 155)
1067 return;
1068
1069 for (port = PORT_A; port < I915_MAX_PORTS; port++)
1070 parse_ddi_port(dev_priv, port, bdb);
1071 }
1072
1073 static void
parse_device_mapping(struct drm_i915_private * dev_priv,const struct bdb_header * bdb)1074 parse_device_mapping(struct drm_i915_private *dev_priv,
1075 const struct bdb_header *bdb)
1076 {
1077 const struct bdb_general_definitions *p_defs;
1078 const union child_device_config *p_child;
1079 union child_device_config *child_dev_ptr;
1080 int i, child_device_num, count;
1081 u8 expected_size;
1082 u16 block_size;
1083
1084 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1085 if (!p_defs) {
1086 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1087 return;
1088 }
1089 if (bdb->version < 195) {
1090 expected_size = sizeof(struct old_child_dev_config);
1091 } else if (bdb->version == 195) {
1092 expected_size = 37;
1093 } else if (bdb->version <= 197) {
1094 expected_size = 38;
1095 } else {
1096 expected_size = 38;
1097 BUILD_BUG_ON(sizeof(*p_child) < 38);
1098 DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
1099 bdb->version, expected_size);
1100 }
1101
1102 /* The legacy sized child device config is the minimum we need. */
1103 if (p_defs->child_dev_size < sizeof(struct old_child_dev_config)) {
1104 DRM_ERROR("Child device config size %u is too small.\n",
1105 p_defs->child_dev_size);
1106 return;
1107 }
1108
1109 /* Flag an error for unexpected size, but continue anyway. */
1110 if (p_defs->child_dev_size != expected_size)
1111 DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n",
1112 p_defs->child_dev_size, expected_size, bdb->version);
1113
1114 /* get the block size of general definitions */
1115 block_size = get_blocksize(p_defs);
1116 /* get the number of child device */
1117 child_device_num = (block_size - sizeof(*p_defs)) /
1118 p_defs->child_dev_size;
1119 count = 0;
1120 /* get the number of child device that is present */
1121 for (i = 0; i < child_device_num; i++) {
1122 p_child = child_device_ptr(p_defs, i);
1123 if (!p_child->common.device_type) {
1124 /* skip the device block if device type is invalid */
1125 continue;
1126 }
1127 count++;
1128 }
1129 if (!count) {
1130 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1131 return;
1132 }
1133 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1134 if (!dev_priv->vbt.child_dev) {
1135 DRM_DEBUG_KMS("No memory space for child device\n");
1136 return;
1137 }
1138
1139 dev_priv->vbt.child_dev_num = count;
1140 count = 0;
1141 for (i = 0; i < child_device_num; i++) {
1142 p_child = child_device_ptr(p_defs, i);
1143 if (!p_child->common.device_type) {
1144 /* skip the device block if device type is invalid */
1145 continue;
1146 }
1147
1148 if (p_child->common.dvo_port >= DVO_PORT_MIPIA
1149 && p_child->common.dvo_port <= DVO_PORT_MIPID
1150 &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) {
1151 DRM_DEBUG_KMS("Found MIPI as LFP\n");
1152 dev_priv->vbt.has_mipi = 1;
1153 dev_priv->vbt.dsi.port = p_child->common.dvo_port;
1154 }
1155
1156 child_dev_ptr = dev_priv->vbt.child_dev + count;
1157 count++;
1158
1159 /*
1160 * Copy as much as we know (sizeof) and is available
1161 * (child_dev_size) of the child device. Accessing the data must
1162 * depend on VBT version.
1163 */
1164 memcpy(child_dev_ptr, p_child,
1165 min_t(size_t, p_defs->child_dev_size, sizeof(*p_child)));
1166 }
1167 return;
1168 }
1169
1170 static void
init_vbt_defaults(struct drm_i915_private * dev_priv)1171 init_vbt_defaults(struct drm_i915_private *dev_priv)
1172 {
1173 struct drm_device *dev = dev_priv->dev;
1174 enum port port;
1175
1176 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
1177
1178 /* Default to having backlight */
1179 dev_priv->vbt.backlight.present = true;
1180
1181 /* LFP panel data */
1182 dev_priv->vbt.lvds_dither = 1;
1183 dev_priv->vbt.lvds_vbt = 0;
1184
1185 /* SDVO panel data */
1186 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1187
1188 /* general features */
1189 dev_priv->vbt.int_tv_support = 1;
1190 dev_priv->vbt.int_crt_support = 1;
1191
1192 /* Default to using SSC */
1193 dev_priv->vbt.lvds_use_ssc = 1;
1194 /*
1195 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1196 * clock for LVDS.
1197 */
1198 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
1199 !HAS_PCH_SPLIT(dev));
1200 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1201
1202 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1203 struct ddi_vbt_port_info *info =
1204 &dev_priv->vbt.ddi_port_info[port];
1205
1206 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1207
1208 info->supports_dvi = (port != PORT_A && port != PORT_E);
1209 info->supports_hdmi = info->supports_dvi;
1210 info->supports_dp = (port != PORT_E);
1211 }
1212 }
1213
intel_no_opregion_vbt_callback(const struct dmi_system_id * id)1214 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
1215 {
1216 DRM_DEBUG_KMS("Falling back to manually reading VBT from "
1217 "VBIOS ROM for %s\n",
1218 id->ident);
1219 return 1;
1220 }
1221
1222 static const struct dmi_system_id intel_no_opregion_vbt[] = {
1223 {
1224 .callback = intel_no_opregion_vbt_callback,
1225 .ident = "ThinkCentre A57",
1226 .matches = {
1227 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1228 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
1229 },
1230 },
1231 { }
1232 };
1233
validate_vbt(const void * base,size_t size,const void * _vbt,const char * source)1234 static const struct bdb_header *validate_vbt(const void *base,
1235 size_t size,
1236 const void *_vbt,
1237 const char *source)
1238 {
1239 size_t offset = _vbt - base;
1240 const struct vbt_header *vbt = _vbt;
1241 const struct bdb_header *bdb;
1242
1243 if (offset + sizeof(struct vbt_header) > size) {
1244 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1245 return NULL;
1246 }
1247
1248 if (memcmp(vbt->signature, "$VBT", 4)) {
1249 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1250 return NULL;
1251 }
1252
1253 offset += vbt->bdb_offset;
1254 if (offset + sizeof(struct bdb_header) > size) {
1255 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1256 return NULL;
1257 }
1258
1259 bdb = base + offset;
1260 if (offset + bdb->bdb_size > size) {
1261 DRM_DEBUG_DRIVER("BDB incomplete\n");
1262 return NULL;
1263 }
1264
1265 DRM_DEBUG_KMS("Using VBT from %s: %20s\n",
1266 source, vbt->signature);
1267 return bdb;
1268 }
1269
find_vbt(void __iomem * bios,size_t size)1270 static const struct bdb_header *find_vbt(void __iomem *bios, size_t size)
1271 {
1272 const struct bdb_header *bdb = NULL;
1273 size_t i;
1274
1275 /* Scour memory looking for the VBT signature. */
1276 for (i = 0; i + 4 < size; i++) {
1277 if (ioread32(bios + i) == *((const u32 *) "$VBT")) {
1278 /*
1279 * This is the one place where we explicitly discard the
1280 * address space (__iomem) of the BIOS/VBT. From now on
1281 * everything is based on 'base', and treated as regular
1282 * memory.
1283 */
1284 void *_bios = (void __force *) bios;
1285
1286 bdb = validate_vbt(_bios, size, _bios + i, "PCI ROM");
1287 break;
1288 }
1289 }
1290
1291 return bdb;
1292 }
1293
1294 /**
1295 * intel_parse_bios - find VBT and initialize settings from the BIOS
1296 * @dev: DRM device
1297 *
1298 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1299 * to appropriate values.
1300 *
1301 * Returns 0 on success, nonzero on failure.
1302 */
1303 int
intel_parse_bios(struct drm_device * dev)1304 intel_parse_bios(struct drm_device *dev)
1305 {
1306 struct drm_i915_private *dev_priv = dev->dev_private;
1307 struct pci_dev *pdev = dev->pdev;
1308 const struct bdb_header *bdb = NULL;
1309 u8 __iomem *bios = NULL;
1310
1311 if (HAS_PCH_NOP(dev))
1312 return -ENODEV;
1313
1314 init_vbt_defaults(dev_priv);
1315
1316 /* XXX Should this validation be moved to intel_opregion.c? */
1317 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt)
1318 bdb = validate_vbt(dev_priv->opregion.header, OPREGION_SIZE,
1319 dev_priv->opregion.vbt, "OpRegion");
1320
1321 if (bdb == NULL) {
1322 size_t size;
1323
1324 bios = pci_map_rom(pdev, &size);
1325 if (!bios)
1326 return -1;
1327
1328 bdb = find_vbt(bios, size);
1329 if (!bdb) {
1330 pci_unmap_rom(pdev, bios);
1331 return -1;
1332 }
1333 }
1334
1335 /* Grab useful general definitions */
1336 parse_general_features(dev_priv, bdb);
1337 parse_general_definitions(dev_priv, bdb);
1338 parse_lfp_panel_data(dev_priv, bdb);
1339 parse_lfp_backlight(dev_priv, bdb);
1340 parse_sdvo_panel_data(dev_priv, bdb);
1341 parse_sdvo_device_mapping(dev_priv, bdb);
1342 parse_device_mapping(dev_priv, bdb);
1343 parse_driver_features(dev_priv, bdb);
1344 parse_edp(dev_priv, bdb);
1345 parse_psr(dev_priv, bdb);
1346 parse_mipi(dev_priv, bdb);
1347 parse_ddi_ports(dev_priv, bdb);
1348
1349 if (bios)
1350 pci_unmap_rom(pdev, bios);
1351
1352 return 0;
1353 }
1354