1 /*
2 * Copyright © 2006 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27 #include <linux/dmi.h>
28 #include <drm/drm_dp_helper.h>
29 #include <drm/drmP.h>
30 #include <drm/i915_drm.h>
31 #include "i915_drv.h"
32 #include "intel_bios.h"
33
34 #define SLAVE_ADDR1 0x70
35 #define SLAVE_ADDR2 0x72
36
37 static int panel_type;
38
39 static void *
find_section(struct bdb_header * bdb,int section_id)40 find_section(struct bdb_header *bdb, int section_id)
41 {
42 u8 *base = (u8 *)bdb;
43 int index = 0;
44 u32 total, current_size;
45 u8 current_id;
46
47 /* skip to first section */
48 index += bdb->header_size;
49 total = bdb->bdb_size;
50
51 /* walk the sections looking for section_id */
52 while (index + 3 < total) {
53 current_id = *(base + index);
54 index++;
55
56 current_size = *((u16 *)(base + index));
57 index += 2;
58
59 /* The MIPI Sequence Block v3+ has a separate size field. */
60 if (current_id == BDB_MIPI_SEQUENCE && *(base + index) >= 3)
61 current_size = *((const u32 *)(base + index + 1));
62
63 if (index + current_size > total)
64 return NULL;
65
66 if (current_id == section_id)
67 return base + index;
68
69 index += current_size;
70 }
71
72 return NULL;
73 }
74
75 static u16
get_blocksize(void * p)76 get_blocksize(void *p)
77 {
78 u16 *block_ptr, block_size;
79
80 block_ptr = (u16 *)((char *)p - 2);
81 block_size = *block_ptr;
82 return block_size;
83 }
84
85 static void
fill_detail_timing_data(struct drm_display_mode * panel_fixed_mode,const struct lvds_dvo_timing * dvo_timing)86 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
87 const struct lvds_dvo_timing *dvo_timing)
88 {
89 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
90 dvo_timing->hactive_lo;
91 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
92 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
93 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
94 dvo_timing->hsync_pulse_width;
95 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
96 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
97
98 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
99 dvo_timing->vactive_lo;
100 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
101 dvo_timing->vsync_off;
102 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
103 dvo_timing->vsync_pulse_width;
104 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
105 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
106 panel_fixed_mode->clock = dvo_timing->clock * 10;
107 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
108
109 if (dvo_timing->hsync_positive)
110 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
111 else
112 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
113
114 if (dvo_timing->vsync_positive)
115 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
116 else
117 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
118
119 /* Some VBTs have bogus h/vtotal values */
120 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
121 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
122 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
123 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
124
125 drm_mode_set_name(panel_fixed_mode);
126 }
127
128 static bool
lvds_dvo_timing_equal_size(const struct lvds_dvo_timing * a,const struct lvds_dvo_timing * b)129 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
130 const struct lvds_dvo_timing *b)
131 {
132 if (a->hactive_hi != b->hactive_hi ||
133 a->hactive_lo != b->hactive_lo)
134 return false;
135
136 if (a->hsync_off_hi != b->hsync_off_hi ||
137 a->hsync_off_lo != b->hsync_off_lo)
138 return false;
139
140 if (a->hsync_pulse_width != b->hsync_pulse_width)
141 return false;
142
143 if (a->hblank_hi != b->hblank_hi ||
144 a->hblank_lo != b->hblank_lo)
145 return false;
146
147 if (a->vactive_hi != b->vactive_hi ||
148 a->vactive_lo != b->vactive_lo)
149 return false;
150
151 if (a->vsync_off != b->vsync_off)
152 return false;
153
154 if (a->vsync_pulse_width != b->vsync_pulse_width)
155 return false;
156
157 if (a->vblank_hi != b->vblank_hi ||
158 a->vblank_lo != b->vblank_lo)
159 return false;
160
161 return true;
162 }
163
164 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)165 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
166 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
167 int index)
168 {
169 /*
170 * the size of fp_timing varies on the different platform.
171 * So calculate the DVO timing relative offset in LVDS data
172 * entry to get the DVO timing entry
173 */
174
175 int lfp_data_size =
176 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
177 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
178 int dvo_timing_offset =
179 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
180 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
181 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
182
183 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
184 }
185
186 /* get lvds_fp_timing entry
187 * this function may return NULL if the corresponding entry is invalid
188 */
189 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)190 get_lvds_fp_timing(const struct bdb_header *bdb,
191 const struct bdb_lvds_lfp_data *data,
192 const struct bdb_lvds_lfp_data_ptrs *ptrs,
193 int index)
194 {
195 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
196 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
197 size_t ofs;
198
199 if (index >= ARRAY_SIZE(ptrs->ptr))
200 return NULL;
201 ofs = ptrs->ptr[index].fp_timing_offset;
202 if (ofs < data_ofs ||
203 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
204 return NULL;
205 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
206 }
207
208 /* Try to find integrated panel data */
209 static void
parse_lfp_panel_data(struct drm_i915_private * dev_priv,struct bdb_header * bdb)210 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
211 struct bdb_header *bdb)
212 {
213 const struct bdb_lvds_options *lvds_options;
214 const struct bdb_lvds_lfp_data *lvds_lfp_data;
215 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
216 const struct lvds_dvo_timing *panel_dvo_timing;
217 const struct lvds_fp_timing *fp_timing;
218 struct drm_display_mode *panel_fixed_mode;
219 int i, downclock, drrs_mode;
220
221 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
222 if (!lvds_options)
223 return;
224
225 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
226 if (lvds_options->panel_type == 0xff)
227 return;
228
229 panel_type = lvds_options->panel_type;
230
231 drrs_mode = (lvds_options->dps_panel_type_bits
232 >> (panel_type * 2)) & MODE_MASK;
233 /*
234 * VBT has static DRRS = 0 and seamless DRRS = 2.
235 * The below piece of code is required to adjust vbt.drrs_type
236 * to match the enum drrs_support_type.
237 */
238 switch (drrs_mode) {
239 case 0:
240 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
241 DRM_DEBUG_KMS("DRRS supported mode is static\n");
242 break;
243 case 2:
244 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
245 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
246 break;
247 default:
248 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
249 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
250 break;
251 }
252
253 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
254 if (!lvds_lfp_data)
255 return;
256
257 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
258 if (!lvds_lfp_data_ptrs)
259 return;
260
261 dev_priv->vbt.lvds_vbt = 1;
262
263 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
264 lvds_lfp_data_ptrs,
265 lvds_options->panel_type);
266
267 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
268 if (!panel_fixed_mode)
269 return;
270
271 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
272
273 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
274
275 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
276 drm_mode_debug_printmodeline(panel_fixed_mode);
277
278 /*
279 * Iterate over the LVDS panel timing info to find the lowest clock
280 * for the native resolution.
281 */
282 downclock = panel_dvo_timing->clock;
283 for (i = 0; i < 16; i++) {
284 const struct lvds_dvo_timing *dvo_timing;
285
286 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
287 lvds_lfp_data_ptrs,
288 i);
289 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
290 dvo_timing->clock < downclock)
291 downclock = dvo_timing->clock;
292 }
293
294 if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) {
295 dev_priv->lvds_downclock_avail = 1;
296 dev_priv->lvds_downclock = downclock * 10;
297 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
298 "Normal Clock %dKHz, downclock %dKHz\n",
299 panel_fixed_mode->clock, 10*downclock);
300 }
301
302 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
303 lvds_lfp_data_ptrs,
304 lvds_options->panel_type);
305 if (fp_timing) {
306 /* check the resolution, just to be sure */
307 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
308 fp_timing->y_res == panel_fixed_mode->vdisplay) {
309 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
310 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
311 dev_priv->vbt.bios_lvds_val);
312 }
313 }
314 }
315
316 static void
parse_lfp_backlight(struct drm_i915_private * dev_priv,struct bdb_header * bdb)317 parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
318 {
319 const struct bdb_lfp_backlight_data *backlight_data;
320 const struct bdb_lfp_backlight_data_entry *entry;
321
322 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
323 if (!backlight_data)
324 return;
325
326 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
327 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
328 backlight_data->entry_size);
329 return;
330 }
331
332 entry = &backlight_data->data[panel_type];
333
334 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
335 if (!dev_priv->vbt.backlight.present) {
336 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
337 entry->type);
338 return;
339 }
340
341 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
342 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
343 dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
344 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
345 "active %s, min brightness %u, level %u\n",
346 dev_priv->vbt.backlight.pwm_freq_hz,
347 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
348 dev_priv->vbt.backlight.min_brightness,
349 backlight_data->level[panel_type]);
350 }
351
352 /* Try to find sdvo panel data */
353 static void
parse_sdvo_panel_data(struct drm_i915_private * dev_priv,struct bdb_header * bdb)354 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
355 struct bdb_header *bdb)
356 {
357 struct lvds_dvo_timing *dvo_timing;
358 struct drm_display_mode *panel_fixed_mode;
359 int index;
360
361 index = i915.vbt_sdvo_panel_type;
362 if (index == -2) {
363 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
364 return;
365 }
366
367 if (index == -1) {
368 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
369
370 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
371 if (!sdvo_lvds_options)
372 return;
373
374 index = sdvo_lvds_options->panel_type;
375 }
376
377 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
378 if (!dvo_timing)
379 return;
380
381 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
382 if (!panel_fixed_mode)
383 return;
384
385 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
386
387 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
388
389 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
390 drm_mode_debug_printmodeline(panel_fixed_mode);
391 }
392
intel_bios_ssc_frequency(struct drm_device * dev,bool alternate)393 static int intel_bios_ssc_frequency(struct drm_device *dev,
394 bool alternate)
395 {
396 switch (INTEL_INFO(dev)->gen) {
397 case 2:
398 return alternate ? 66667 : 48000;
399 case 3:
400 case 4:
401 return alternate ? 100000 : 96000;
402 default:
403 return alternate ? 100000 : 120000;
404 }
405 }
406
407 static void
parse_general_features(struct drm_i915_private * dev_priv,struct bdb_header * bdb)408 parse_general_features(struct drm_i915_private *dev_priv,
409 struct bdb_header *bdb)
410 {
411 struct drm_device *dev = dev_priv->dev;
412 struct bdb_general_features *general;
413
414 general = find_section(bdb, BDB_GENERAL_FEATURES);
415 if (general) {
416 dev_priv->vbt.int_tv_support = general->int_tv_support;
417 dev_priv->vbt.int_crt_support = general->int_crt_support;
418 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
419 dev_priv->vbt.lvds_ssc_freq =
420 intel_bios_ssc_frequency(dev, general->ssc_freq);
421 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
422 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
423 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",
424 dev_priv->vbt.int_tv_support,
425 dev_priv->vbt.int_crt_support,
426 dev_priv->vbt.lvds_use_ssc,
427 dev_priv->vbt.lvds_ssc_freq,
428 dev_priv->vbt.display_clock_mode,
429 dev_priv->vbt.fdi_rx_polarity_inverted);
430 }
431 }
432
433 static void
parse_general_definitions(struct drm_i915_private * dev_priv,struct bdb_header * bdb)434 parse_general_definitions(struct drm_i915_private *dev_priv,
435 struct bdb_header *bdb)
436 {
437 struct bdb_general_definitions *general;
438
439 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
440 if (general) {
441 u16 block_size = get_blocksize(general);
442 if (block_size >= sizeof(*general)) {
443 int bus_pin = general->crt_ddc_gmbus_pin;
444 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
445 if (intel_gmbus_is_port_valid(bus_pin))
446 dev_priv->vbt.crt_ddc_pin = bus_pin;
447 } else {
448 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
449 block_size);
450 }
451 }
452 }
453
454 static void
parse_sdvo_device_mapping(struct drm_i915_private * dev_priv,struct bdb_header * bdb)455 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
456 struct bdb_header *bdb)
457 {
458 struct sdvo_device_mapping *p_mapping;
459 struct bdb_general_definitions *p_defs;
460 union child_device_config *p_child;
461 int i, child_device_num, count;
462 u16 block_size;
463
464 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
465 if (!p_defs) {
466 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
467 return;
468 }
469 /* judge whether the size of child device meets the requirements.
470 * If the child device size obtained from general definition block
471 * is different with sizeof(struct child_device_config), skip the
472 * parsing of sdvo device info
473 */
474 if (p_defs->child_dev_size != sizeof(*p_child)) {
475 /* different child dev size . Ignore it */
476 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
477 return;
478 }
479 /* get the block size of general definitions */
480 block_size = get_blocksize(p_defs);
481 /* get the number of child device */
482 child_device_num = (block_size - sizeof(*p_defs)) /
483 sizeof(*p_child);
484 count = 0;
485 for (i = 0; i < child_device_num; i++) {
486 p_child = &(p_defs->devices[i]);
487 if (!p_child->old.device_type) {
488 /* skip the device block if device type is invalid */
489 continue;
490 }
491 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
492 p_child->old.slave_addr != SLAVE_ADDR2) {
493 /*
494 * If the slave address is neither 0x70 nor 0x72,
495 * it is not a SDVO device. Skip it.
496 */
497 continue;
498 }
499 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
500 p_child->old.dvo_port != DEVICE_PORT_DVOC) {
501 /* skip the incorrect SDVO port */
502 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
503 continue;
504 }
505 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
506 " %s port\n",
507 p_child->old.slave_addr,
508 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
509 "SDVOB" : "SDVOC");
510 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
511 if (!p_mapping->initialized) {
512 p_mapping->dvo_port = p_child->old.dvo_port;
513 p_mapping->slave_addr = p_child->old.slave_addr;
514 p_mapping->dvo_wiring = p_child->old.dvo_wiring;
515 p_mapping->ddc_pin = p_child->old.ddc_pin;
516 p_mapping->i2c_pin = p_child->old.i2c_pin;
517 p_mapping->initialized = 1;
518 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
519 p_mapping->dvo_port,
520 p_mapping->slave_addr,
521 p_mapping->dvo_wiring,
522 p_mapping->ddc_pin,
523 p_mapping->i2c_pin);
524 } else {
525 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
526 "two SDVO device.\n");
527 }
528 if (p_child->old.slave2_addr) {
529 /* Maybe this is a SDVO device with multiple inputs */
530 /* And the mapping info is not added */
531 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
532 " is a SDVO device with multiple inputs.\n");
533 }
534 count++;
535 }
536
537 if (!count) {
538 /* No SDVO device info is found */
539 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
540 }
541 return;
542 }
543
544 static void
parse_driver_features(struct drm_i915_private * dev_priv,struct bdb_header * bdb)545 parse_driver_features(struct drm_i915_private *dev_priv,
546 struct bdb_header *bdb)
547 {
548 struct bdb_driver_features *driver;
549
550 driver = find_section(bdb, BDB_DRIVER_FEATURES);
551 if (!driver)
552 return;
553
554 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
555 dev_priv->vbt.edp_support = 1;
556
557 if (driver->dual_frequency)
558 dev_priv->render_reclock_avail = true;
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
571 static void
parse_edp(struct drm_i915_private * dev_priv,struct bdb_header * bdb)572 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
573 {
574 struct bdb_edp *edp;
575 struct edp_power_seq *edp_pps;
576 struct edp_link_params *edp_link_params;
577
578 edp = find_section(bdb, BDB_EDP);
579 if (!edp) {
580 if (dev_priv->vbt.edp_support)
581 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
582 return;
583 }
584
585 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
586 case EDP_18BPP:
587 dev_priv->vbt.edp_bpp = 18;
588 break;
589 case EDP_24BPP:
590 dev_priv->vbt.edp_bpp = 24;
591 break;
592 case EDP_30BPP:
593 dev_priv->vbt.edp_bpp = 30;
594 break;
595 }
596
597 /* Get the eDP sequencing and link info */
598 edp_pps = &edp->power_seqs[panel_type];
599 edp_link_params = &edp->link_params[panel_type];
600
601 dev_priv->vbt.edp_pps = *edp_pps;
602
603 switch (edp_link_params->rate) {
604 case EDP_RATE_1_62:
605 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
606 break;
607 case EDP_RATE_2_7:
608 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
609 break;
610 default:
611 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
612 edp_link_params->rate);
613 break;
614 }
615
616 switch (edp_link_params->lanes) {
617 case EDP_LANE_1:
618 dev_priv->vbt.edp_lanes = 1;
619 break;
620 case EDP_LANE_2:
621 dev_priv->vbt.edp_lanes = 2;
622 break;
623 case EDP_LANE_4:
624 dev_priv->vbt.edp_lanes = 4;
625 break;
626 default:
627 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
628 edp_link_params->lanes);
629 break;
630 }
631
632 switch (edp_link_params->preemphasis) {
633 case EDP_PREEMPHASIS_NONE:
634 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
635 break;
636 case EDP_PREEMPHASIS_3_5dB:
637 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
638 break;
639 case EDP_PREEMPHASIS_6dB:
640 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
641 break;
642 case EDP_PREEMPHASIS_9_5dB:
643 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
644 break;
645 default:
646 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
647 edp_link_params->preemphasis);
648 break;
649 }
650
651 switch (edp_link_params->vswing) {
652 case EDP_VSWING_0_4V:
653 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
654 break;
655 case EDP_VSWING_0_6V:
656 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
657 break;
658 case EDP_VSWING_0_8V:
659 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
660 break;
661 case EDP_VSWING_1_2V:
662 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
663 break;
664 default:
665 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
666 edp_link_params->vswing);
667 break;
668 }
669
670 if (bdb->version >= 173) {
671 uint8_t vswing;
672
673 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
674 dev_priv->vbt.edp_low_vswing = vswing == 0;
675 }
676 }
677
678 static void
parse_psr(struct drm_i915_private * dev_priv,struct bdb_header * bdb)679 parse_psr(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
680 {
681 struct bdb_psr *psr;
682 struct psr_table *psr_table;
683
684 psr = find_section(bdb, BDB_PSR);
685 if (!psr) {
686 DRM_DEBUG_KMS("No PSR BDB found.\n");
687 return;
688 }
689
690 psr_table = &psr->psr_table[panel_type];
691
692 dev_priv->vbt.psr.full_link = psr_table->full_link;
693 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
694
695 /* Allowed VBT values goes from 0 to 15 */
696 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
697 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
698
699 switch (psr_table->lines_to_wait) {
700 case 0:
701 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
702 break;
703 case 1:
704 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
705 break;
706 case 2:
707 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
708 break;
709 case 3:
710 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
711 break;
712 default:
713 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
714 psr_table->lines_to_wait);
715 break;
716 }
717
718 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
719 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
720 }
721
goto_next_sequence(u8 * data,int * size)722 static u8 *goto_next_sequence(u8 *data, int *size)
723 {
724 u16 len;
725 int tmp = *size;
726
727 if (--tmp < 0)
728 return NULL;
729
730 /* goto first element */
731 data++;
732 while (1) {
733 switch (*data) {
734 case MIPI_SEQ_ELEM_SEND_PKT:
735 /*
736 * skip by this element payload size
737 * skip elem id, command flag and data type
738 */
739 tmp -= 5;
740 if (tmp < 0)
741 return NULL;
742
743 data += 3;
744 len = *((u16 *)data);
745
746 tmp -= len;
747 if (tmp < 0)
748 return NULL;
749
750 /* skip by len */
751 data = data + 2 + len;
752 break;
753 case MIPI_SEQ_ELEM_DELAY:
754 /* skip by elem id, and delay is 4 bytes */
755 tmp -= 5;
756 if (tmp < 0)
757 return NULL;
758
759 data += 5;
760 break;
761 case MIPI_SEQ_ELEM_GPIO:
762 tmp -= 3;
763 if (tmp < 0)
764 return NULL;
765
766 data += 3;
767 break;
768 default:
769 DRM_ERROR("Unknown element\n");
770 return NULL;
771 }
772
773 /* end of sequence ? */
774 if (*data == 0)
775 break;
776 }
777
778 /* goto next sequence or end of block byte */
779 if (--tmp < 0)
780 return NULL;
781
782 data++;
783
784 /* update amount of data left for the sequence block to be parsed */
785 *size = tmp;
786 return data;
787 }
788
789 static void
parse_mipi(struct drm_i915_private * dev_priv,struct bdb_header * bdb)790 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
791 {
792 struct bdb_mipi_config *start;
793 struct bdb_mipi_sequence *sequence;
794 struct mipi_config *config;
795 struct mipi_pps_data *pps;
796 u8 *data, *seq_data;
797 int i, panel_id, seq_size;
798 u16 block_size;
799
800 /* parse MIPI blocks only if LFP type is MIPI */
801 if (!dev_priv->vbt.has_mipi)
802 return;
803
804 /* Initialize this to undefined indicating no generic MIPI support */
805 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
806
807 /* Block #40 is already parsed and panel_fixed_mode is
808 * stored in dev_priv->lfp_lvds_vbt_mode
809 * resuse this when needed
810 */
811
812 /* Parse #52 for panel index used from panel_type already
813 * parsed
814 */
815 start = find_section(bdb, BDB_MIPI_CONFIG);
816 if (!start) {
817 DRM_DEBUG_KMS("No MIPI config BDB found");
818 return;
819 }
820
821 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
822 panel_type);
823
824 /*
825 * get hold of the correct configuration block and pps data as per
826 * the panel_type as index
827 */
828 config = &start->config[panel_type];
829 pps = &start->pps[panel_type];
830
831 /* store as of now full data. Trim when we realise all is not needed */
832 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
833 if (!dev_priv->vbt.dsi.config)
834 return;
835
836 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
837 if (!dev_priv->vbt.dsi.pps) {
838 kfree(dev_priv->vbt.dsi.config);
839 return;
840 }
841
842 /* We have mandatory mipi config blocks. Initialize as generic panel */
843 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
844
845 /* Check if we have sequence block as well */
846 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
847 if (!sequence) {
848 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
849 return;
850 }
851
852 /* Fail gracefully for forward incompatible sequence block. */
853 if (sequence->version >= 3) {
854 DRM_ERROR("Unable to parse MIPI Sequence Block v3+\n");
855 return;
856 }
857
858 DRM_DEBUG_DRIVER("Found MIPI sequence block\n");
859
860 block_size = get_blocksize(sequence);
861
862 /*
863 * parse the sequence block for individual sequences
864 */
865 dev_priv->vbt.dsi.seq_version = sequence->version;
866
867 seq_data = &sequence->data[0];
868
869 /*
870 * sequence block is variable length and hence we need to parse and
871 * get the sequence data for specific panel id
872 */
873 for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) {
874 panel_id = *seq_data;
875 seq_size = *((u16 *) (seq_data + 1));
876 if (panel_id == panel_type)
877 break;
878
879 /* skip the sequence including seq header of 3 bytes */
880 seq_data = seq_data + 3 + seq_size;
881 if ((seq_data - &sequence->data[0]) > block_size) {
882 DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n");
883 return;
884 }
885 }
886
887 if (i == MAX_MIPI_CONFIGURATIONS) {
888 DRM_ERROR("Sequence block detected but no valid configuration\n");
889 return;
890 }
891
892 /* check if found sequence is completely within the sequence block
893 * just being paranoid */
894 if (seq_size > block_size) {
895 DRM_ERROR("Corrupted sequence/size, bailing out\n");
896 return;
897 }
898
899 /* skip the panel id(1 byte) and seq size(2 bytes) */
900 dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL);
901 if (!dev_priv->vbt.dsi.data)
902 return;
903
904 /*
905 * loop into the sequence data and split into multiple sequneces
906 * There are only 5 types of sequences as of now
907 */
908 data = dev_priv->vbt.dsi.data;
909 dev_priv->vbt.dsi.size = seq_size;
910
911 /* two consecutive 0x00 indicate end of all sequences */
912 while (1) {
913 int seq_id = *data;
914 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) {
915 dev_priv->vbt.dsi.sequence[seq_id] = data;
916 DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id);
917 } else {
918 DRM_ERROR("undefined sequence\n");
919 goto err;
920 }
921
922 /* partial parsing to skip elements */
923 data = goto_next_sequence(data, &seq_size);
924
925 if (data == NULL) {
926 DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n");
927 goto err;
928 }
929
930 if (*data == 0)
931 break; /* end of sequence reached */
932 }
933
934 DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n");
935 return;
936 err:
937 kfree(dev_priv->vbt.dsi.data);
938 dev_priv->vbt.dsi.data = NULL;
939
940 /* error during parsing so set all pointers to null
941 * because of partial parsing */
942 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
943 }
944
parse_ddi_port(struct drm_i915_private * dev_priv,enum port port,struct bdb_header * bdb)945 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
946 struct bdb_header *bdb)
947 {
948 union child_device_config *it, *child = NULL;
949 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
950 uint8_t hdmi_level_shift;
951 int i, j;
952 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
953 uint8_t aux_channel;
954 /* Each DDI port can have more than one value on the "DVO Port" field,
955 * so look for all the possible values for each port and abort if more
956 * than one is found. */
957 int dvo_ports[][2] = {
958 {DVO_PORT_HDMIA, DVO_PORT_DPA},
959 {DVO_PORT_HDMIB, DVO_PORT_DPB},
960 {DVO_PORT_HDMIC, DVO_PORT_DPC},
961 {DVO_PORT_HDMID, DVO_PORT_DPD},
962 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
963 };
964
965 /* Find the child device to use, abort if more than one found. */
966 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
967 it = dev_priv->vbt.child_dev + i;
968
969 for (j = 0; j < 2; j++) {
970 if (dvo_ports[port][j] == -1)
971 break;
972
973 if (it->common.dvo_port == dvo_ports[port][j]) {
974 if (child) {
975 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
976 port_name(port));
977 return;
978 }
979 child = it;
980 }
981 }
982 }
983 if (!child)
984 return;
985
986 aux_channel = child->raw[25];
987
988 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
989 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
990 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
991 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
992 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
993
994 info->supports_dvi = is_dvi;
995 info->supports_hdmi = is_hdmi;
996 info->supports_dp = is_dp;
997
998 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
999 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
1000
1001 if (is_edp && is_dvi)
1002 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
1003 port_name(port));
1004 if (is_crt && port != PORT_E)
1005 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
1006 if (is_crt && (is_dvi || is_dp))
1007 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
1008 port_name(port));
1009 if (is_dvi && (port == PORT_A || port == PORT_E))
1010 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
1011 if (!is_dvi && !is_dp && !is_crt)
1012 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
1013 port_name(port));
1014 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
1015 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
1016
1017 if (is_dvi) {
1018 if (child->common.ddc_pin == 0x05 && port != PORT_B)
1019 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
1020 if (child->common.ddc_pin == 0x04 && port != PORT_C)
1021 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
1022 if (child->common.ddc_pin == 0x06 && port != PORT_D)
1023 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
1024 }
1025
1026 if (is_dp) {
1027 if (aux_channel == 0x40 && port != PORT_A)
1028 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
1029 if (aux_channel == 0x10 && port != PORT_B)
1030 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
1031 if (aux_channel == 0x20 && port != PORT_C)
1032 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
1033 if (aux_channel == 0x30 && port != PORT_D)
1034 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
1035 }
1036
1037 if (bdb->version >= 158) {
1038 /* The VBT HDMI level shift values match the table we have. */
1039 hdmi_level_shift = child->raw[7] & 0xF;
1040 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1041 port_name(port),
1042 hdmi_level_shift);
1043 info->hdmi_level_shift = hdmi_level_shift;
1044 }
1045 }
1046
parse_ddi_ports(struct drm_i915_private * dev_priv,struct bdb_header * bdb)1047 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
1048 struct bdb_header *bdb)
1049 {
1050 struct drm_device *dev = dev_priv->dev;
1051 enum port port;
1052
1053 if (!HAS_DDI(dev))
1054 return;
1055
1056 if (!dev_priv->vbt.child_dev_num)
1057 return;
1058
1059 if (bdb->version < 155)
1060 return;
1061
1062 for (port = PORT_A; port < I915_MAX_PORTS; port++)
1063 parse_ddi_port(dev_priv, port, bdb);
1064 }
1065
1066 static void
parse_device_mapping(struct drm_i915_private * dev_priv,struct bdb_header * bdb)1067 parse_device_mapping(struct drm_i915_private *dev_priv,
1068 struct bdb_header *bdb)
1069 {
1070 struct bdb_general_definitions *p_defs;
1071 union child_device_config *p_child, *child_dev_ptr;
1072 int i, child_device_num, count;
1073 u16 block_size;
1074
1075 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1076 if (!p_defs) {
1077 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1078 return;
1079 }
1080 /* judge whether the size of child device meets the requirements.
1081 * If the child device size obtained from general definition block
1082 * is different with sizeof(struct child_device_config), skip the
1083 * parsing of sdvo device info
1084 */
1085 if (p_defs->child_dev_size != sizeof(*p_child)) {
1086 /* different child dev size . Ignore it */
1087 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
1088 return;
1089 }
1090 /* get the block size of general definitions */
1091 block_size = get_blocksize(p_defs);
1092 /* get the number of child device */
1093 child_device_num = (block_size - sizeof(*p_defs)) /
1094 sizeof(*p_child);
1095 count = 0;
1096 /* get the number of child device that is present */
1097 for (i = 0; i < child_device_num; i++) {
1098 p_child = &(p_defs->devices[i]);
1099 if (!p_child->common.device_type) {
1100 /* skip the device block if device type is invalid */
1101 continue;
1102 }
1103 count++;
1104 }
1105 if (!count) {
1106 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1107 return;
1108 }
1109 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1110 if (!dev_priv->vbt.child_dev) {
1111 DRM_DEBUG_KMS("No memory space for child device\n");
1112 return;
1113 }
1114
1115 dev_priv->vbt.child_dev_num = count;
1116 count = 0;
1117 for (i = 0; i < child_device_num; i++) {
1118 p_child = &(p_defs->devices[i]);
1119 if (!p_child->common.device_type) {
1120 /* skip the device block if device type is invalid */
1121 continue;
1122 }
1123
1124 if (p_child->common.dvo_port >= DVO_PORT_MIPIA
1125 && p_child->common.dvo_port <= DVO_PORT_MIPID
1126 &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) {
1127 DRM_DEBUG_KMS("Found MIPI as LFP\n");
1128 dev_priv->vbt.has_mipi = 1;
1129 dev_priv->vbt.dsi.port = p_child->common.dvo_port;
1130 }
1131
1132 child_dev_ptr = dev_priv->vbt.child_dev + count;
1133 count++;
1134 memcpy((void *)child_dev_ptr, (void *)p_child,
1135 sizeof(*p_child));
1136 }
1137 return;
1138 }
1139
1140 static void
init_vbt_defaults(struct drm_i915_private * dev_priv)1141 init_vbt_defaults(struct drm_i915_private *dev_priv)
1142 {
1143 struct drm_device *dev = dev_priv->dev;
1144 enum port port;
1145
1146 dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
1147
1148 /* Default to having backlight */
1149 dev_priv->vbt.backlight.present = true;
1150
1151 /* LFP panel data */
1152 dev_priv->vbt.lvds_dither = 1;
1153 dev_priv->vbt.lvds_vbt = 0;
1154
1155 /* SDVO panel data */
1156 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1157
1158 /* general features */
1159 dev_priv->vbt.int_tv_support = 1;
1160 dev_priv->vbt.int_crt_support = 1;
1161
1162 /* Default to using SSC */
1163 dev_priv->vbt.lvds_use_ssc = 1;
1164 /*
1165 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1166 * clock for LVDS.
1167 */
1168 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
1169 !HAS_PCH_SPLIT(dev));
1170 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1171
1172 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1173 struct ddi_vbt_port_info *info =
1174 &dev_priv->vbt.ddi_port_info[port];
1175
1176 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1177
1178 info->supports_dvi = (port != PORT_A && port != PORT_E);
1179 info->supports_hdmi = info->supports_dvi;
1180 info->supports_dp = (port != PORT_E);
1181 }
1182 }
1183
intel_no_opregion_vbt_callback(const struct dmi_system_id * id)1184 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
1185 {
1186 DRM_DEBUG_KMS("Falling back to manually reading VBT from "
1187 "VBIOS ROM for %s\n",
1188 id->ident);
1189 return 1;
1190 }
1191
1192 static const struct dmi_system_id intel_no_opregion_vbt[] = {
1193 {
1194 .callback = intel_no_opregion_vbt_callback,
1195 .ident = "ThinkCentre A57",
1196 .matches = {
1197 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1198 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
1199 },
1200 },
1201 { }
1202 };
1203
validate_vbt(char * base,size_t size,struct vbt_header * vbt,const char * source)1204 static struct bdb_header *validate_vbt(char *base, size_t size,
1205 struct vbt_header *vbt,
1206 const char *source)
1207 {
1208 size_t offset;
1209 struct bdb_header *bdb;
1210
1211 if (vbt == NULL) {
1212 DRM_DEBUG_DRIVER("VBT signature missing\n");
1213 return NULL;
1214 }
1215
1216 offset = (char *)vbt - base;
1217 if (offset + sizeof(struct vbt_header) > size) {
1218 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1219 return NULL;
1220 }
1221
1222 if (memcmp(vbt->signature, "$VBT", 4)) {
1223 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1224 return NULL;
1225 }
1226
1227 offset += vbt->bdb_offset;
1228 if (offset + sizeof(struct bdb_header) > size) {
1229 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1230 return NULL;
1231 }
1232
1233 bdb = (struct bdb_header *)(base + offset);
1234 if (offset + bdb->bdb_size > size) {
1235 DRM_DEBUG_DRIVER("BDB incomplete\n");
1236 return NULL;
1237 }
1238
1239 DRM_DEBUG_KMS("Using VBT from %s: %20s\n",
1240 source, vbt->signature);
1241 return bdb;
1242 }
1243
1244 /**
1245 * intel_parse_bios - find VBT and initialize settings from the BIOS
1246 * @dev: DRM device
1247 *
1248 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1249 * to appropriate values.
1250 *
1251 * Returns 0 on success, nonzero on failure.
1252 */
1253 int
intel_parse_bios(struct drm_device * dev)1254 intel_parse_bios(struct drm_device *dev)
1255 {
1256 struct drm_i915_private *dev_priv = dev->dev_private;
1257 struct pci_dev *pdev = dev->pdev;
1258 struct bdb_header *bdb = NULL;
1259 u8 __iomem *bios = NULL;
1260
1261 if (HAS_PCH_NOP(dev))
1262 return -ENODEV;
1263
1264 init_vbt_defaults(dev_priv);
1265
1266 /* XXX Should this validation be moved to intel_opregion.c? */
1267 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt)
1268 bdb = validate_vbt((char *)dev_priv->opregion.header, OPREGION_SIZE,
1269 (struct vbt_header *)dev_priv->opregion.vbt,
1270 "OpRegion");
1271
1272 if (bdb == NULL) {
1273 size_t i, size;
1274
1275 bios = pci_map_rom(pdev, &size);
1276 if (!bios)
1277 return -1;
1278
1279 /* Scour memory looking for the VBT signature */
1280 for (i = 0; i + 4 < size; i++) {
1281 if (memcmp(bios + i, "$VBT", 4) == 0) {
1282 bdb = validate_vbt(bios, size,
1283 (struct vbt_header *)(bios + i),
1284 "PCI ROM");
1285 break;
1286 }
1287 }
1288
1289 if (!bdb) {
1290 pci_unmap_rom(pdev, bios);
1291 return -1;
1292 }
1293 }
1294
1295 /* Grab useful general definitions */
1296 parse_general_features(dev_priv, bdb);
1297 parse_general_definitions(dev_priv, bdb);
1298 parse_lfp_panel_data(dev_priv, bdb);
1299 parse_lfp_backlight(dev_priv, bdb);
1300 parse_sdvo_panel_data(dev_priv, bdb);
1301 parse_sdvo_device_mapping(dev_priv, bdb);
1302 parse_device_mapping(dev_priv, bdb);
1303 parse_driver_features(dev_priv, bdb);
1304 parse_edp(dev_priv, bdb);
1305 parse_psr(dev_priv, bdb);
1306 parse_mipi(dev_priv, bdb);
1307 parse_ddi_ports(dev_priv, bdb);
1308
1309 if (bios)
1310 pci_unmap_rom(pdev, bios);
1311
1312 return 0;
1313 }
1314
1315 /* Ensure that vital registers have been initialised, even if the BIOS
1316 * is absent or just failing to do its job.
1317 */
intel_setup_bios(struct drm_device * dev)1318 void intel_setup_bios(struct drm_device *dev)
1319 {
1320 struct drm_i915_private *dev_priv = dev->dev_private;
1321
1322 /* Set the Panel Power On/Off timings if uninitialized. */
1323 if (!HAS_PCH_SPLIT(dev) &&
1324 I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
1325 /* Set T2 to 40ms and T5 to 200ms */
1326 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
1327
1328 /* Set T3 to 35ms and Tx to 200ms */
1329 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
1330 }
1331 }
1332