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drm/i915: Validate VBT header before trusting it
[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_bios.c
1 /*
2 * Copyright © 2006 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27 #include <linux/dmi.h>
28 #include <drm/drm_dp_helper.h>
29 #include <drm/drmP.h>
30 #include <drm/i915_drm.h>
31 #include "i915_drv.h"
32 #include "intel_bios.h"
33
34 #define SLAVE_ADDR1 0x70
35 #define SLAVE_ADDR2 0x72
36
37 static int panel_type;
38
39 static void *
40 find_section(struct bdb_header *bdb, int section_id)
41 {
42 u8 *base = (u8 *)bdb;
43 int index = 0;
44 u16 total, current_size;
45 u8 current_id;
46
47 /* skip to first section */
48 index += bdb->header_size;
49 total = bdb->bdb_size;
50
51 /* walk the sections looking for section_id */
52 while (index + 3 < total) {
53 current_id = *(base + index);
54 index++;
55
56 current_size = *((u16 *)(base + index));
57 index += 2;
58
59 if (index + current_size > total)
60 return NULL;
61
62 if (current_id == section_id)
63 return base + index;
64
65 index += current_size;
66 }
67
68 return NULL;
69 }
70
71 static u16
72 get_blocksize(void *p)
73 {
74 u16 *block_ptr, block_size;
75
76 block_ptr = (u16 *)((char *)p - 2);
77 block_size = *block_ptr;
78 return block_size;
79 }
80
81 static void
82 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
83 const struct lvds_dvo_timing *dvo_timing)
84 {
85 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
86 dvo_timing->hactive_lo;
87 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
88 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
89 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
90 dvo_timing->hsync_pulse_width;
91 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
92 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
93
94 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
95 dvo_timing->vactive_lo;
96 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
97 dvo_timing->vsync_off;
98 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
99 dvo_timing->vsync_pulse_width;
100 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
101 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
102 panel_fixed_mode->clock = dvo_timing->clock * 10;
103 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
104
105 if (dvo_timing->hsync_positive)
106 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
107 else
108 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
109
110 if (dvo_timing->vsync_positive)
111 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
112 else
113 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
114
115 /* Some VBTs have bogus h/vtotal values */
116 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
117 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
118 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
119 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
120
121 drm_mode_set_name(panel_fixed_mode);
122 }
123
124 static bool
125 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
126 const struct lvds_dvo_timing *b)
127 {
128 if (a->hactive_hi != b->hactive_hi ||
129 a->hactive_lo != b->hactive_lo)
130 return false;
131
132 if (a->hsync_off_hi != b->hsync_off_hi ||
133 a->hsync_off_lo != b->hsync_off_lo)
134 return false;
135
136 if (a->hsync_pulse_width != b->hsync_pulse_width)
137 return false;
138
139 if (a->hblank_hi != b->hblank_hi ||
140 a->hblank_lo != b->hblank_lo)
141 return false;
142
143 if (a->vactive_hi != b->vactive_hi ||
144 a->vactive_lo != b->vactive_lo)
145 return false;
146
147 if (a->vsync_off != b->vsync_off)
148 return false;
149
150 if (a->vsync_pulse_width != b->vsync_pulse_width)
151 return false;
152
153 if (a->vblank_hi != b->vblank_hi ||
154 a->vblank_lo != b->vblank_lo)
155 return false;
156
157 return true;
158 }
159
160 static const struct lvds_dvo_timing *
161 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
162 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
163 int index)
164 {
165 /*
166 * the size of fp_timing varies on the different platform.
167 * So calculate the DVO timing relative offset in LVDS data
168 * entry to get the DVO timing entry
169 */
170
171 int lfp_data_size =
172 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
173 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
174 int dvo_timing_offset =
175 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
176 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
177 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
178
179 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
180 }
181
182 /* get lvds_fp_timing entry
183 * this function may return NULL if the corresponding entry is invalid
184 */
185 static const struct lvds_fp_timing *
186 get_lvds_fp_timing(const struct bdb_header *bdb,
187 const struct bdb_lvds_lfp_data *data,
188 const struct bdb_lvds_lfp_data_ptrs *ptrs,
189 int index)
190 {
191 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
192 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
193 size_t ofs;
194
195 if (index >= ARRAY_SIZE(ptrs->ptr))
196 return NULL;
197 ofs = ptrs->ptr[index].fp_timing_offset;
198 if (ofs < data_ofs ||
199 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
200 return NULL;
201 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
202 }
203
204 /* Try to find integrated panel data */
205 static void
206 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
207 struct bdb_header *bdb)
208 {
209 const struct bdb_lvds_options *lvds_options;
210 const struct bdb_lvds_lfp_data *lvds_lfp_data;
211 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
212 const struct lvds_dvo_timing *panel_dvo_timing;
213 const struct lvds_fp_timing *fp_timing;
214 struct drm_display_mode *panel_fixed_mode;
215 int i, downclock, drrs_mode;
216
217 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
218 if (!lvds_options)
219 return;
220
221 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
222 if (lvds_options->panel_type == 0xff)
223 return;
224
225 panel_type = lvds_options->panel_type;
226
227 drrs_mode = (lvds_options->dps_panel_type_bits
228 >> (panel_type * 2)) & MODE_MASK;
229 /*
230 * VBT has static DRRS = 0 and seamless DRRS = 2.
231 * The below piece of code is required to adjust vbt.drrs_type
232 * to match the enum drrs_support_type.
233 */
234 switch (drrs_mode) {
235 case 0:
236 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
237 DRM_DEBUG_KMS("DRRS supported mode is static\n");
238 break;
239 case 2:
240 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
241 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
242 break;
243 default:
244 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
245 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
246 break;
247 }
248
249 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
250 if (!lvds_lfp_data)
251 return;
252
253 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
254 if (!lvds_lfp_data_ptrs)
255 return;
256
257 dev_priv->vbt.lvds_vbt = 1;
258
259 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
260 lvds_lfp_data_ptrs,
261 lvds_options->panel_type);
262
263 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
264 if (!panel_fixed_mode)
265 return;
266
267 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
268
269 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
270
271 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
272 drm_mode_debug_printmodeline(panel_fixed_mode);
273
274 /*
275 * Iterate over the LVDS panel timing info to find the lowest clock
276 * for the native resolution.
277 */
278 downclock = panel_dvo_timing->clock;
279 for (i = 0; i < 16; i++) {
280 const struct lvds_dvo_timing *dvo_timing;
281
282 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
283 lvds_lfp_data_ptrs,
284 i);
285 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
286 dvo_timing->clock < downclock)
287 downclock = dvo_timing->clock;
288 }
289
290 if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) {
291 dev_priv->lvds_downclock_avail = 1;
292 dev_priv->lvds_downclock = downclock * 10;
293 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
294 "Normal Clock %dKHz, downclock %dKHz\n",
295 panel_fixed_mode->clock, 10*downclock);
296 }
297
298 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
299 lvds_lfp_data_ptrs,
300 lvds_options->panel_type);
301 if (fp_timing) {
302 /* check the resolution, just to be sure */
303 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
304 fp_timing->y_res == panel_fixed_mode->vdisplay) {
305 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
306 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
307 dev_priv->vbt.bios_lvds_val);
308 }
309 }
310 }
311
312 static void
313 parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
314 {
315 const struct bdb_lfp_backlight_data *backlight_data;
316 const struct bdb_lfp_backlight_data_entry *entry;
317
318 /* Err to enabling backlight if no backlight block. */
319 dev_priv->vbt.backlight.present = true;
320
321 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
322 if (!backlight_data)
323 return;
324
325 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
326 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
327 backlight_data->entry_size);
328 return;
329 }
330
331 entry = &backlight_data->data[panel_type];
332
333 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
334 if (!dev_priv->vbt.backlight.present) {
335 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
336 entry->type);
337 return;
338 }
339
340 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
341 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
342 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
343 "active %s, min brightness %u, level %u\n",
344 dev_priv->vbt.backlight.pwm_freq_hz,
345 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
346 entry->min_brightness,
347 backlight_data->level[panel_type]);
348 }
349
350 /* Try to find sdvo panel data */
351 static void
352 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
353 struct bdb_header *bdb)
354 {
355 struct lvds_dvo_timing *dvo_timing;
356 struct drm_display_mode *panel_fixed_mode;
357 int index;
358
359 index = i915.vbt_sdvo_panel_type;
360 if (index == -2) {
361 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
362 return;
363 }
364
365 if (index == -1) {
366 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
367
368 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
369 if (!sdvo_lvds_options)
370 return;
371
372 index = sdvo_lvds_options->panel_type;
373 }
374
375 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
376 if (!dvo_timing)
377 return;
378
379 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
380 if (!panel_fixed_mode)
381 return;
382
383 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
384
385 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
386
387 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
388 drm_mode_debug_printmodeline(panel_fixed_mode);
389 }
390
391 static int intel_bios_ssc_frequency(struct drm_device *dev,
392 bool alternate)
393 {
394 switch (INTEL_INFO(dev)->gen) {
395 case 2:
396 return alternate ? 66667 : 48000;
397 case 3:
398 case 4:
399 return alternate ? 100000 : 96000;
400 default:
401 return alternate ? 100000 : 120000;
402 }
403 }
404
405 static void
406 parse_general_features(struct drm_i915_private *dev_priv,
407 struct bdb_header *bdb)
408 {
409 struct drm_device *dev = dev_priv->dev;
410 struct bdb_general_features *general;
411
412 general = find_section(bdb, BDB_GENERAL_FEATURES);
413 if (general) {
414 dev_priv->vbt.int_tv_support = general->int_tv_support;
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, 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 }
430
431 static void
432 parse_general_definitions(struct drm_i915_private *dev_priv,
433 struct bdb_header *bdb)
434 {
435 struct bdb_general_definitions *general;
436
437 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
438 if (general) {
439 u16 block_size = get_blocksize(general);
440 if (block_size >= sizeof(*general)) {
441 int bus_pin = general->crt_ddc_gmbus_pin;
442 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
443 if (intel_gmbus_is_port_valid(bus_pin))
444 dev_priv->vbt.crt_ddc_pin = bus_pin;
445 } else {
446 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
447 block_size);
448 }
449 }
450 }
451
452 static void
453 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
454 struct bdb_header *bdb)
455 {
456 struct sdvo_device_mapping *p_mapping;
457 struct bdb_general_definitions *p_defs;
458 union child_device_config *p_child;
459 int i, child_device_num, count;
460 u16 block_size;
461
462 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
463 if (!p_defs) {
464 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
465 return;
466 }
467 /* judge whether the size of child device meets the requirements.
468 * If the child device size obtained from general definition block
469 * is different with sizeof(struct child_device_config), skip the
470 * parsing of sdvo device info
471 */
472 if (p_defs->child_dev_size != sizeof(*p_child)) {
473 /* different child dev size . Ignore it */
474 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
475 return;
476 }
477 /* get the block size of general definitions */
478 block_size = get_blocksize(p_defs);
479 /* get the number of child device */
480 child_device_num = (block_size - sizeof(*p_defs)) /
481 sizeof(*p_child);
482 count = 0;
483 for (i = 0; i < child_device_num; i++) {
484 p_child = &(p_defs->devices[i]);
485 if (!p_child->old.device_type) {
486 /* skip the device block if device type is invalid */
487 continue;
488 }
489 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
490 p_child->old.slave_addr != SLAVE_ADDR2) {
491 /*
492 * If the slave address is neither 0x70 nor 0x72,
493 * it is not a SDVO device. Skip it.
494 */
495 continue;
496 }
497 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
498 p_child->old.dvo_port != DEVICE_PORT_DVOC) {
499 /* skip the incorrect SDVO port */
500 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
501 continue;
502 }
503 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
504 " %s port\n",
505 p_child->old.slave_addr,
506 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
507 "SDVOB" : "SDVOC");
508 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
509 if (!p_mapping->initialized) {
510 p_mapping->dvo_port = p_child->old.dvo_port;
511 p_mapping->slave_addr = p_child->old.slave_addr;
512 p_mapping->dvo_wiring = p_child->old.dvo_wiring;
513 p_mapping->ddc_pin = p_child->old.ddc_pin;
514 p_mapping->i2c_pin = p_child->old.i2c_pin;
515 p_mapping->initialized = 1;
516 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
517 p_mapping->dvo_port,
518 p_mapping->slave_addr,
519 p_mapping->dvo_wiring,
520 p_mapping->ddc_pin,
521 p_mapping->i2c_pin);
522 } else {
523 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
524 "two SDVO device.\n");
525 }
526 if (p_child->old.slave2_addr) {
527 /* Maybe this is a SDVO device with multiple inputs */
528 /* And the mapping info is not added */
529 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
530 " is a SDVO device with multiple inputs.\n");
531 }
532 count++;
533 }
534
535 if (!count) {
536 /* No SDVO device info is found */
537 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
538 }
539 return;
540 }
541
542 static void
543 parse_driver_features(struct drm_i915_private *dev_priv,
544 struct bdb_header *bdb)
545 {
546 struct bdb_driver_features *driver;
547
548 driver = find_section(bdb, BDB_DRIVER_FEATURES);
549 if (!driver)
550 return;
551
552 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
553 dev_priv->vbt.edp_support = 1;
554
555 if (driver->dual_frequency)
556 dev_priv->render_reclock_avail = true;
557
558 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
559 /*
560 * If DRRS is not supported, drrs_type has to be set to 0.
561 * This is because, VBT is configured in such a way that
562 * static DRRS is 0 and DRRS not supported is represented by
563 * driver->drrs_enabled=false
564 */
565 if (!driver->drrs_enabled)
566 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
567 }
568
569 static void
570 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
571 {
572 struct bdb_edp *edp;
573 struct edp_power_seq *edp_pps;
574 struct edp_link_params *edp_link_params;
575
576 edp = find_section(bdb, BDB_EDP);
577 if (!edp) {
578 if (dev_priv->vbt.edp_support)
579 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
580 return;
581 }
582
583 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
584 case EDP_18BPP:
585 dev_priv->vbt.edp_bpp = 18;
586 break;
587 case EDP_24BPP:
588 dev_priv->vbt.edp_bpp = 24;
589 break;
590 case EDP_30BPP:
591 dev_priv->vbt.edp_bpp = 30;
592 break;
593 }
594
595 /* Get the eDP sequencing and link info */
596 edp_pps = &edp->power_seqs[panel_type];
597 edp_link_params = &edp->link_params[panel_type];
598
599 dev_priv->vbt.edp_pps = *edp_pps;
600
601 dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
602 DP_LINK_BW_1_62;
603 switch (edp_link_params->lanes) {
604 case 0:
605 dev_priv->vbt.edp_lanes = 1;
606 break;
607 case 1:
608 dev_priv->vbt.edp_lanes = 2;
609 break;
610 case 3:
611 default:
612 dev_priv->vbt.edp_lanes = 4;
613 break;
614 }
615 switch (edp_link_params->preemphasis) {
616 case 0:
617 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
618 break;
619 case 1:
620 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
621 break;
622 case 2:
623 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
624 break;
625 case 3:
626 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
627 break;
628 }
629 switch (edp_link_params->vswing) {
630 case 0:
631 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
632 break;
633 case 1:
634 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
635 break;
636 case 2:
637 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
638 break;
639 case 3:
640 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
641 break;
642 }
643 }
644
645 static u8 *goto_next_sequence(u8 *data, int *size)
646 {
647 u16 len;
648 int tmp = *size;
649
650 if (--tmp < 0)
651 return NULL;
652
653 /* goto first element */
654 data++;
655 while (1) {
656 switch (*data) {
657 case MIPI_SEQ_ELEM_SEND_PKT:
658 /*
659 * skip by this element payload size
660 * skip elem id, command flag and data type
661 */
662 tmp -= 5;
663 if (tmp < 0)
664 return NULL;
665
666 data += 3;
667 len = *((u16 *)data);
668
669 tmp -= len;
670 if (tmp < 0)
671 return NULL;
672
673 /* skip by len */
674 data = data + 2 + len;
675 break;
676 case MIPI_SEQ_ELEM_DELAY:
677 /* skip by elem id, and delay is 4 bytes */
678 tmp -= 5;
679 if (tmp < 0)
680 return NULL;
681
682 data += 5;
683 break;
684 case MIPI_SEQ_ELEM_GPIO:
685 tmp -= 3;
686 if (tmp < 0)
687 return NULL;
688
689 data += 3;
690 break;
691 default:
692 DRM_ERROR("Unknown element\n");
693 return NULL;
694 }
695
696 /* end of sequence ? */
697 if (*data == 0)
698 break;
699 }
700
701 /* goto next sequence or end of block byte */
702 if (--tmp < 0)
703 return NULL;
704
705 data++;
706
707 /* update amount of data left for the sequence block to be parsed */
708 *size = tmp;
709 return data;
710 }
711
712 static void
713 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
714 {
715 struct bdb_mipi_config *start;
716 struct bdb_mipi_sequence *sequence;
717 struct mipi_config *config;
718 struct mipi_pps_data *pps;
719 u8 *data, *seq_data;
720 int i, panel_id, seq_size;
721 u16 block_size;
722
723 /* Initialize this to undefined indicating no generic MIPI support */
724 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
725
726 /* Block #40 is already parsed and panel_fixed_mode is
727 * stored in dev_priv->lfp_lvds_vbt_mode
728 * resuse this when needed
729 */
730
731 /* Parse #52 for panel index used from panel_type already
732 * parsed
733 */
734 start = find_section(bdb, BDB_MIPI_CONFIG);
735 if (!start) {
736 DRM_DEBUG_KMS("No MIPI config BDB found");
737 return;
738 }
739
740 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
741 panel_type);
742
743 /*
744 * get hold of the correct configuration block and pps data as per
745 * the panel_type as index
746 */
747 config = &start->config[panel_type];
748 pps = &start->pps[panel_type];
749
750 /* store as of now full data. Trim when we realise all is not needed */
751 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
752 if (!dev_priv->vbt.dsi.config)
753 return;
754
755 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
756 if (!dev_priv->vbt.dsi.pps) {
757 kfree(dev_priv->vbt.dsi.config);
758 return;
759 }
760
761 /* We have mandatory mipi config blocks. Initialize as generic panel */
762 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
763
764 /* Check if we have sequence block as well */
765 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
766 if (!sequence) {
767 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
768 return;
769 }
770
771 DRM_DEBUG_DRIVER("Found MIPI sequence block\n");
772
773 block_size = get_blocksize(sequence);
774
775 /*
776 * parse the sequence block for individual sequences
777 */
778 dev_priv->vbt.dsi.seq_version = sequence->version;
779
780 seq_data = &sequence->data[0];
781
782 /*
783 * sequence block is variable length and hence we need to parse and
784 * get the sequence data for specific panel id
785 */
786 for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) {
787 panel_id = *seq_data;
788 seq_size = *((u16 *) (seq_data + 1));
789 if (panel_id == panel_type)
790 break;
791
792 /* skip the sequence including seq header of 3 bytes */
793 seq_data = seq_data + 3 + seq_size;
794 if ((seq_data - &sequence->data[0]) > block_size) {
795 DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n");
796 return;
797 }
798 }
799
800 if (i == MAX_MIPI_CONFIGURATIONS) {
801 DRM_ERROR("Sequence block detected but no valid configuration\n");
802 return;
803 }
804
805 /* check if found sequence is completely within the sequence block
806 * just being paranoid */
807 if (seq_size > block_size) {
808 DRM_ERROR("Corrupted sequence/size, bailing out\n");
809 return;
810 }
811
812 /* skip the panel id(1 byte) and seq size(2 bytes) */
813 dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL);
814 if (!dev_priv->vbt.dsi.data)
815 return;
816
817 /*
818 * loop into the sequence data and split into multiple sequneces
819 * There are only 5 types of sequences as of now
820 */
821 data = dev_priv->vbt.dsi.data;
822 dev_priv->vbt.dsi.size = seq_size;
823
824 /* two consecutive 0x00 indicate end of all sequences */
825 while (1) {
826 int seq_id = *data;
827 if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) {
828 dev_priv->vbt.dsi.sequence[seq_id] = data;
829 DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id);
830 } else {
831 DRM_ERROR("undefined sequence\n");
832 goto err;
833 }
834
835 /* partial parsing to skip elements */
836 data = goto_next_sequence(data, &seq_size);
837
838 if (data == NULL) {
839 DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n");
840 goto err;
841 }
842
843 if (*data == 0)
844 break; /* end of sequence reached */
845 }
846
847 DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n");
848 return;
849 err:
850 kfree(dev_priv->vbt.dsi.data);
851 dev_priv->vbt.dsi.data = NULL;
852
853 /* error during parsing so set all pointers to null
854 * because of partial parsing */
855 memset(dev_priv->vbt.dsi.sequence, 0, MIPI_SEQ_MAX);
856 }
857
858 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
859 struct bdb_header *bdb)
860 {
861 union child_device_config *it, *child = NULL;
862 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
863 uint8_t hdmi_level_shift;
864 int i, j;
865 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
866 uint8_t aux_channel;
867 /* Each DDI port can have more than one value on the "DVO Port" field,
868 * so look for all the possible values for each port and abort if more
869 * than one is found. */
870 int dvo_ports[][2] = {
871 {DVO_PORT_HDMIA, DVO_PORT_DPA},
872 {DVO_PORT_HDMIB, DVO_PORT_DPB},
873 {DVO_PORT_HDMIC, DVO_PORT_DPC},
874 {DVO_PORT_HDMID, DVO_PORT_DPD},
875 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
876 };
877
878 /* Find the child device to use, abort if more than one found. */
879 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
880 it = dev_priv->vbt.child_dev + i;
881
882 for (j = 0; j < 2; j++) {
883 if (dvo_ports[port][j] == -1)
884 break;
885
886 if (it->common.dvo_port == dvo_ports[port][j]) {
887 if (child) {
888 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
889 port_name(port));
890 return;
891 }
892 child = it;
893 }
894 }
895 }
896 if (!child)
897 return;
898
899 aux_channel = child->raw[25];
900
901 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
902 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
903 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
904 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
905 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
906
907 info->supports_dvi = is_dvi;
908 info->supports_hdmi = is_hdmi;
909 info->supports_dp = is_dp;
910
911 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
912 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
913
914 if (is_edp && is_dvi)
915 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
916 port_name(port));
917 if (is_crt && port != PORT_E)
918 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
919 if (is_crt && (is_dvi || is_dp))
920 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
921 port_name(port));
922 if (is_dvi && (port == PORT_A || port == PORT_E))
923 DRM_DEBUG_KMS("Port %c is TMDS compabile\n", port_name(port));
924 if (!is_dvi && !is_dp && !is_crt)
925 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
926 port_name(port));
927 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
928 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
929
930 if (is_dvi) {
931 if (child->common.ddc_pin == 0x05 && port != PORT_B)
932 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
933 if (child->common.ddc_pin == 0x04 && port != PORT_C)
934 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
935 if (child->common.ddc_pin == 0x06 && port != PORT_D)
936 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
937 }
938
939 if (is_dp) {
940 if (aux_channel == 0x40 && port != PORT_A)
941 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
942 if (aux_channel == 0x10 && port != PORT_B)
943 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
944 if (aux_channel == 0x20 && port != PORT_C)
945 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
946 if (aux_channel == 0x30 && port != PORT_D)
947 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
948 }
949
950 if (bdb->version >= 158) {
951 /* The VBT HDMI level shift values match the table we have. */
952 hdmi_level_shift = child->raw[7] & 0xF;
953 if (hdmi_level_shift < 0xC) {
954 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
955 port_name(port),
956 hdmi_level_shift);
957 info->hdmi_level_shift = hdmi_level_shift;
958 }
959 }
960 }
961
962 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
963 struct bdb_header *bdb)
964 {
965 struct drm_device *dev = dev_priv->dev;
966 enum port port;
967
968 if (!HAS_DDI(dev))
969 return;
970
971 if (!dev_priv->vbt.child_dev_num)
972 return;
973
974 if (bdb->version < 155)
975 return;
976
977 for (port = PORT_A; port < I915_MAX_PORTS; port++)
978 parse_ddi_port(dev_priv, port, bdb);
979 }
980
981 static void
982 parse_device_mapping(struct drm_i915_private *dev_priv,
983 struct bdb_header *bdb)
984 {
985 struct bdb_general_definitions *p_defs;
986 union child_device_config *p_child, *child_dev_ptr;
987 int i, child_device_num, count;
988 u16 block_size;
989
990 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
991 if (!p_defs) {
992 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
993 return;
994 }
995 /* judge whether the size of child device meets the requirements.
996 * If the child device size obtained from general definition block
997 * is different with sizeof(struct child_device_config), skip the
998 * parsing of sdvo device info
999 */
1000 if (p_defs->child_dev_size != sizeof(*p_child)) {
1001 /* different child dev size . Ignore it */
1002 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
1003 return;
1004 }
1005 /* get the block size of general definitions */
1006 block_size = get_blocksize(p_defs);
1007 /* get the number of child device */
1008 child_device_num = (block_size - sizeof(*p_defs)) /
1009 sizeof(*p_child);
1010 count = 0;
1011 /* get the number of child device that is present */
1012 for (i = 0; i < child_device_num; i++) {
1013 p_child = &(p_defs->devices[i]);
1014 if (!p_child->common.device_type) {
1015 /* skip the device block if device type is invalid */
1016 continue;
1017 }
1018 count++;
1019 }
1020 if (!count) {
1021 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1022 return;
1023 }
1024 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1025 if (!dev_priv->vbt.child_dev) {
1026 DRM_DEBUG_KMS("No memory space for child device\n");
1027 return;
1028 }
1029
1030 dev_priv->vbt.child_dev_num = count;
1031 count = 0;
1032 for (i = 0; i < child_device_num; i++) {
1033 p_child = &(p_defs->devices[i]);
1034 if (!p_child->common.device_type) {
1035 /* skip the device block if device type is invalid */
1036 continue;
1037 }
1038 child_dev_ptr = dev_priv->vbt.child_dev + count;
1039 count++;
1040 memcpy((void *)child_dev_ptr, (void *)p_child,
1041 sizeof(*p_child));
1042 }
1043 return;
1044 }
1045
1046 static void
1047 init_vbt_defaults(struct drm_i915_private *dev_priv)
1048 {
1049 struct drm_device *dev = dev_priv->dev;
1050 enum port port;
1051
1052 dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
1053
1054 /* LFP panel data */
1055 dev_priv->vbt.lvds_dither = 1;
1056 dev_priv->vbt.lvds_vbt = 0;
1057
1058 /* SDVO panel data */
1059 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1060
1061 /* general features */
1062 dev_priv->vbt.int_tv_support = 1;
1063 dev_priv->vbt.int_crt_support = 1;
1064
1065 /* Default to using SSC */
1066 dev_priv->vbt.lvds_use_ssc = 1;
1067 /*
1068 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1069 * clock for LVDS.
1070 */
1071 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
1072 !HAS_PCH_SPLIT(dev));
1073 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1074
1075 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1076 struct ddi_vbt_port_info *info =
1077 &dev_priv->vbt.ddi_port_info[port];
1078
1079 /* Recommended BSpec default: 800mV 0dB. */
1080 info->hdmi_level_shift = 6;
1081
1082 info->supports_dvi = (port != PORT_A && port != PORT_E);
1083 info->supports_hdmi = info->supports_dvi;
1084 info->supports_dp = (port != PORT_E);
1085 }
1086 }
1087
1088 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
1089 {
1090 DRM_DEBUG_KMS("Falling back to manually reading VBT from "
1091 "VBIOS ROM for %s\n",
1092 id->ident);
1093 return 1;
1094 }
1095
1096 static const struct dmi_system_id intel_no_opregion_vbt[] = {
1097 {
1098 .callback = intel_no_opregion_vbt_callback,
1099 .ident = "ThinkCentre A57",
1100 .matches = {
1101 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1102 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
1103 },
1104 },
1105 { }
1106 };
1107
1108 static struct bdb_header *validate_vbt(char *base, size_t size,
1109 struct vbt_header *vbt,
1110 const char *source)
1111 {
1112 size_t offset;
1113 struct bdb_header *bdb;
1114
1115 if (vbt == NULL) {
1116 DRM_DEBUG_DRIVER("VBT signature missing\n");
1117 return NULL;
1118 }
1119
1120 offset = (char *)vbt - base;
1121 if (offset + sizeof(struct vbt_header) > size) {
1122 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1123 return NULL;
1124 }
1125
1126 if (memcmp(vbt->signature, "$VBT", 4)) {
1127 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1128 return NULL;
1129 }
1130
1131 offset += vbt->bdb_offset;
1132 if (offset + sizeof(struct bdb_header) > size) {
1133 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1134 return NULL;
1135 }
1136
1137 bdb = (struct bdb_header *)(base + offset);
1138 if (offset + bdb->bdb_size > size) {
1139 DRM_DEBUG_DRIVER("BDB incomplete\n");
1140 return NULL;
1141 }
1142
1143 DRM_DEBUG_KMS("Using VBT from %s: %20s\n",
1144 source, vbt->signature);
1145 return bdb;
1146 }
1147
1148 /**
1149 * intel_parse_bios - find VBT and initialize settings from the BIOS
1150 * @dev: DRM device
1151 *
1152 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1153 * to appropriate values.
1154 *
1155 * Returns 0 on success, nonzero on failure.
1156 */
1157 int
1158 intel_parse_bios(struct drm_device *dev)
1159 {
1160 struct drm_i915_private *dev_priv = dev->dev_private;
1161 struct pci_dev *pdev = dev->pdev;
1162 struct bdb_header *bdb = NULL;
1163 u8 __iomem *bios = NULL;
1164
1165 if (HAS_PCH_NOP(dev))
1166 return -ENODEV;
1167
1168 init_vbt_defaults(dev_priv);
1169
1170 /* XXX Should this validation be moved to intel_opregion.c? */
1171 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt)
1172 bdb = validate_vbt((char *)dev_priv->opregion.header, OPREGION_SIZE,
1173 (struct vbt_header *)dev_priv->opregion.vbt,
1174 "OpRegion");
1175
1176 if (bdb == NULL) {
1177 size_t i, size;
1178
1179 bios = pci_map_rom(pdev, &size);
1180 if (!bios)
1181 return -1;
1182
1183 /* Scour memory looking for the VBT signature */
1184 for (i = 0; i + 4 < size; i++) {
1185 if (memcmp(bios + i, "$VBT", 4) == 0) {
1186 bdb = validate_vbt(bios, size,
1187 (struct vbt_header *)(bios + i),
1188 "PCI ROM");
1189 break;
1190 }
1191 }
1192
1193 if (!bdb) {
1194 pci_unmap_rom(pdev, bios);
1195 return -1;
1196 }
1197 }
1198
1199 /* Grab useful general definitions */
1200 parse_general_features(dev_priv, bdb);
1201 parse_general_definitions(dev_priv, bdb);
1202 parse_lfp_panel_data(dev_priv, bdb);
1203 parse_lfp_backlight(dev_priv, bdb);
1204 parse_sdvo_panel_data(dev_priv, bdb);
1205 parse_sdvo_device_mapping(dev_priv, bdb);
1206 parse_device_mapping(dev_priv, bdb);
1207 parse_driver_features(dev_priv, bdb);
1208 parse_edp(dev_priv, bdb);
1209 parse_mipi(dev_priv, bdb);
1210 parse_ddi_ports(dev_priv, bdb);
1211
1212 if (bios)
1213 pci_unmap_rom(pdev, bios);
1214
1215 return 0;
1216 }
1217
1218 /* Ensure that vital registers have been initialised, even if the BIOS
1219 * is absent or just failing to do its job.
1220 */
1221 void intel_setup_bios(struct drm_device *dev)
1222 {
1223 struct drm_i915_private *dev_priv = dev->dev_private;
1224
1225 /* Set the Panel Power On/Off timings if uninitialized. */
1226 if (!HAS_PCH_SPLIT(dev) &&
1227 I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
1228 /* Set T2 to 40ms and T5 to 200ms */
1229 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
1230
1231 /* Set T3 to 35ms and Tx to 200ms */
1232 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
1233 }
1234 }
Linux kernel - Deliverables
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