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drm/modes: drop __drm_framebuffer_unregister.
[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
28 #include <drm/drm_dp_helper.h>
29 #include <drm/drmP.h>
30 #include <drm/i915_drm.h>
31 #include "i915_drv.h"
32
33 #define _INTEL_BIOS_PRIVATE
34 #include "intel_vbt_defs.h"
35
36 /**
37 * DOC: Video BIOS Table (VBT)
38 *
39 * The Video BIOS Table, or VBT, provides platform and board specific
40 * configuration information to the driver that is not discoverable or available
41 * through other means. The configuration is mostly related to display
42 * hardware. The VBT is available via the ACPI OpRegion or, on older systems, in
43 * the PCI ROM.
44 *
45 * The VBT consists of a VBT Header (defined as &struct vbt_header), a BDB
46 * Header (&struct bdb_header), and a number of BIOS Data Blocks (BDB) that
47 * contain the actual configuration information. The VBT Header, and thus the
48 * VBT, begins with "$VBT" signature. The VBT Header contains the offset of the
49 * BDB Header. The data blocks are concatenated after the BDB Header. The data
50 * blocks have a 1-byte Block ID, 2-byte Block Size, and Block Size bytes of
51 * data. (Block 53, the MIPI Sequence Block is an exception.)
52 *
53 * The driver parses the VBT during load. The relevant information is stored in
54 * driver private data for ease of use, and the actual VBT is not read after
55 * that.
56 */
57
58 #define SLAVE_ADDR1 0x70
59 #define SLAVE_ADDR2 0x72
60
61 static int panel_type;
62
63 /* Get BDB block size given a pointer to Block ID. */
64 static u32 _get_blocksize(const u8 *block_base)
65 {
66 /* The MIPI Sequence Block v3+ has a separate size field. */
67 if (*block_base == BDB_MIPI_SEQUENCE && *(block_base + 3) >= 3)
68 return *((const u32 *)(block_base + 4));
69 else
70 return *((const u16 *)(block_base + 1));
71 }
72
73 /* Get BDB block size give a pointer to data after Block ID and Block Size. */
74 static u32 get_blocksize(const void *block_data)
75 {
76 return _get_blocksize(block_data - 3);
77 }
78
79 static const void *
80 find_section(const void *_bdb, int section_id)
81 {
82 const struct bdb_header *bdb = _bdb;
83 const u8 *base = _bdb;
84 int index = 0;
85 u32 total, current_size;
86 u8 current_id;
87
88 /* skip to first section */
89 index += bdb->header_size;
90 total = bdb->bdb_size;
91
92 /* walk the sections looking for section_id */
93 while (index + 3 < total) {
94 current_id = *(base + index);
95 current_size = _get_blocksize(base + index);
96 index += 3;
97
98 if (index + current_size > total)
99 return NULL;
100
101 if (current_id == section_id)
102 return base + index;
103
104 index += current_size;
105 }
106
107 return NULL;
108 }
109
110 static void
111 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
112 const struct lvds_dvo_timing *dvo_timing)
113 {
114 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
115 dvo_timing->hactive_lo;
116 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
117 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
118 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
119 dvo_timing->hsync_pulse_width;
120 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
121 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
122
123 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
124 dvo_timing->vactive_lo;
125 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
126 dvo_timing->vsync_off;
127 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
128 dvo_timing->vsync_pulse_width;
129 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
130 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
131 panel_fixed_mode->clock = dvo_timing->clock * 10;
132 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
133
134 if (dvo_timing->hsync_positive)
135 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
136 else
137 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
138
139 if (dvo_timing->vsync_positive)
140 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
141 else
142 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
143
144 /* Some VBTs have bogus h/vtotal values */
145 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
146 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
147 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
148 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
149
150 drm_mode_set_name(panel_fixed_mode);
151 }
152
153 static const struct lvds_dvo_timing *
154 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
155 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
156 int index)
157 {
158 /*
159 * the size of fp_timing varies on the different platform.
160 * So calculate the DVO timing relative offset in LVDS data
161 * entry to get the DVO timing entry
162 */
163
164 int lfp_data_size =
165 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
166 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
167 int dvo_timing_offset =
168 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
169 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
170 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
171
172 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
173 }
174
175 /* get lvds_fp_timing entry
176 * this function may return NULL if the corresponding entry is invalid
177 */
178 static const struct lvds_fp_timing *
179 get_lvds_fp_timing(const struct bdb_header *bdb,
180 const struct bdb_lvds_lfp_data *data,
181 const struct bdb_lvds_lfp_data_ptrs *ptrs,
182 int index)
183 {
184 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
185 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
186 size_t ofs;
187
188 if (index >= ARRAY_SIZE(ptrs->ptr))
189 return NULL;
190 ofs = ptrs->ptr[index].fp_timing_offset;
191 if (ofs < data_ofs ||
192 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
193 return NULL;
194 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
195 }
196
197 /* Try to find integrated panel data */
198 static void
199 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
200 const struct bdb_header *bdb)
201 {
202 const struct bdb_lvds_options *lvds_options;
203 const struct bdb_lvds_lfp_data *lvds_lfp_data;
204 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
205 const struct lvds_dvo_timing *panel_dvo_timing;
206 const struct lvds_fp_timing *fp_timing;
207 struct drm_display_mode *panel_fixed_mode;
208 int drrs_mode;
209
210 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
211 if (!lvds_options)
212 return;
213
214 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
215 if (lvds_options->panel_type == 0xff)
216 return;
217
218 panel_type = lvds_options->panel_type;
219
220 drrs_mode = (lvds_options->dps_panel_type_bits
221 >> (panel_type * 2)) & MODE_MASK;
222 /*
223 * VBT has static DRRS = 0 and seamless DRRS = 2.
224 * The below piece of code is required to adjust vbt.drrs_type
225 * to match the enum drrs_support_type.
226 */
227 switch (drrs_mode) {
228 case 0:
229 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
230 DRM_DEBUG_KMS("DRRS supported mode is static\n");
231 break;
232 case 2:
233 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
234 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
235 break;
236 default:
237 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
238 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
239 break;
240 }
241
242 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
243 if (!lvds_lfp_data)
244 return;
245
246 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
247 if (!lvds_lfp_data_ptrs)
248 return;
249
250 dev_priv->vbt.lvds_vbt = 1;
251
252 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
253 lvds_lfp_data_ptrs,
254 lvds_options->panel_type);
255
256 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
257 if (!panel_fixed_mode)
258 return;
259
260 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
261
262 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
263
264 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
265 drm_mode_debug_printmodeline(panel_fixed_mode);
266
267 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
268 lvds_lfp_data_ptrs,
269 lvds_options->panel_type);
270 if (fp_timing) {
271 /* check the resolution, just to be sure */
272 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
273 fp_timing->y_res == panel_fixed_mode->vdisplay) {
274 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
275 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
276 dev_priv->vbt.bios_lvds_val);
277 }
278 }
279 }
280
281 static void
282 parse_lfp_backlight(struct drm_i915_private *dev_priv,
283 const struct bdb_header *bdb)
284 {
285 const struct bdb_lfp_backlight_data *backlight_data;
286 const struct bdb_lfp_backlight_data_entry *entry;
287
288 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
289 if (!backlight_data)
290 return;
291
292 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
293 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
294 backlight_data->entry_size);
295 return;
296 }
297
298 entry = &backlight_data->data[panel_type];
299
300 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
301 if (!dev_priv->vbt.backlight.present) {
302 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
303 entry->type);
304 return;
305 }
306
307 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
308 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
309 dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
310 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
311 "active %s, min brightness %u, level %u\n",
312 dev_priv->vbt.backlight.pwm_freq_hz,
313 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
314 dev_priv->vbt.backlight.min_brightness,
315 backlight_data->level[panel_type]);
316 }
317
318 /* Try to find sdvo panel data */
319 static void
320 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
321 const struct bdb_header *bdb)
322 {
323 const struct lvds_dvo_timing *dvo_timing;
324 struct drm_display_mode *panel_fixed_mode;
325 int index;
326
327 index = i915.vbt_sdvo_panel_type;
328 if (index == -2) {
329 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
330 return;
331 }
332
333 if (index == -1) {
334 const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
335
336 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
337 if (!sdvo_lvds_options)
338 return;
339
340 index = sdvo_lvds_options->panel_type;
341 }
342
343 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
344 if (!dvo_timing)
345 return;
346
347 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
348 if (!panel_fixed_mode)
349 return;
350
351 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
352
353 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
354
355 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
356 drm_mode_debug_printmodeline(panel_fixed_mode);
357 }
358
359 static int intel_bios_ssc_frequency(struct drm_i915_private *dev_priv,
360 bool alternate)
361 {
362 switch (INTEL_INFO(dev_priv)->gen) {
363 case 2:
364 return alternate ? 66667 : 48000;
365 case 3:
366 case 4:
367 return alternate ? 100000 : 96000;
368 default:
369 return alternate ? 100000 : 120000;
370 }
371 }
372
373 static void
374 parse_general_features(struct drm_i915_private *dev_priv,
375 const struct bdb_header *bdb)
376 {
377 const struct bdb_general_features *general;
378
379 general = find_section(bdb, BDB_GENERAL_FEATURES);
380 if (!general)
381 return;
382
383 dev_priv->vbt.int_tv_support = general->int_tv_support;
384 /* int_crt_support can't be trusted on earlier platforms */
385 if (bdb->version >= 155 &&
386 (HAS_DDI(dev_priv) || IS_VALLEYVIEW(dev_priv)))
387 dev_priv->vbt.int_crt_support = general->int_crt_support;
388 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
389 dev_priv->vbt.lvds_ssc_freq =
390 intel_bios_ssc_frequency(dev_priv, general->ssc_freq);
391 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
392 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
393 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",
394 dev_priv->vbt.int_tv_support,
395 dev_priv->vbt.int_crt_support,
396 dev_priv->vbt.lvds_use_ssc,
397 dev_priv->vbt.lvds_ssc_freq,
398 dev_priv->vbt.display_clock_mode,
399 dev_priv->vbt.fdi_rx_polarity_inverted);
400 }
401
402 static void
403 parse_general_definitions(struct drm_i915_private *dev_priv,
404 const struct bdb_header *bdb)
405 {
406 const struct bdb_general_definitions *general;
407
408 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
409 if (general) {
410 u16 block_size = get_blocksize(general);
411 if (block_size >= sizeof(*general)) {
412 int bus_pin = general->crt_ddc_gmbus_pin;
413 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
414 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
415 dev_priv->vbt.crt_ddc_pin = bus_pin;
416 } else {
417 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
418 block_size);
419 }
420 }
421 }
422
423 static const union child_device_config *
424 child_device_ptr(const struct bdb_general_definitions *p_defs, int i)
425 {
426 return (const void *) &p_defs->devices[i * p_defs->child_dev_size];
427 }
428
429 static void
430 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
431 const struct bdb_header *bdb)
432 {
433 struct sdvo_device_mapping *p_mapping;
434 const struct bdb_general_definitions *p_defs;
435 const struct old_child_dev_config *child; /* legacy */
436 int i, child_device_num, count;
437 u16 block_size;
438
439 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
440 if (!p_defs) {
441 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
442 return;
443 }
444
445 /*
446 * Only parse SDVO mappings when the general definitions block child
447 * device size matches that of the *legacy* child device config
448 * struct. Thus, SDVO mapping will be skipped for newer VBT.
449 */
450 if (p_defs->child_dev_size != sizeof(*child)) {
451 DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n");
452 return;
453 }
454 /* get the block size of general definitions */
455 block_size = get_blocksize(p_defs);
456 /* get the number of child device */
457 child_device_num = (block_size - sizeof(*p_defs)) /
458 p_defs->child_dev_size;
459 count = 0;
460 for (i = 0; i < child_device_num; i++) {
461 child = &child_device_ptr(p_defs, i)->old;
462 if (!child->device_type) {
463 /* skip the device block if device type is invalid */
464 continue;
465 }
466 if (child->slave_addr != SLAVE_ADDR1 &&
467 child->slave_addr != SLAVE_ADDR2) {
468 /*
469 * If the slave address is neither 0x70 nor 0x72,
470 * it is not a SDVO device. Skip it.
471 */
472 continue;
473 }
474 if (child->dvo_port != DEVICE_PORT_DVOB &&
475 child->dvo_port != DEVICE_PORT_DVOC) {
476 /* skip the incorrect SDVO port */
477 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
478 continue;
479 }
480 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
481 " %s port\n",
482 child->slave_addr,
483 (child->dvo_port == DEVICE_PORT_DVOB) ?
484 "SDVOB" : "SDVOC");
485 p_mapping = &dev_priv->vbt.sdvo_mappings[child->dvo_port - 1];
486 if (!p_mapping->initialized) {
487 p_mapping->dvo_port = child->dvo_port;
488 p_mapping->slave_addr = child->slave_addr;
489 p_mapping->dvo_wiring = child->dvo_wiring;
490 p_mapping->ddc_pin = child->ddc_pin;
491 p_mapping->i2c_pin = child->i2c_pin;
492 p_mapping->initialized = 1;
493 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
494 p_mapping->dvo_port,
495 p_mapping->slave_addr,
496 p_mapping->dvo_wiring,
497 p_mapping->ddc_pin,
498 p_mapping->i2c_pin);
499 } else {
500 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
501 "two SDVO device.\n");
502 }
503 if (child->slave2_addr) {
504 /* Maybe this is a SDVO device with multiple inputs */
505 /* And the mapping info is not added */
506 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
507 " is a SDVO device with multiple inputs.\n");
508 }
509 count++;
510 }
511
512 if (!count) {
513 /* No SDVO device info is found */
514 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
515 }
516 return;
517 }
518
519 static void
520 parse_driver_features(struct drm_i915_private *dev_priv,
521 const struct bdb_header *bdb)
522 {
523 const struct bdb_driver_features *driver;
524
525 driver = find_section(bdb, BDB_DRIVER_FEATURES);
526 if (!driver)
527 return;
528
529 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
530 dev_priv->vbt.edp.support = 1;
531
532 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
533 /*
534 * If DRRS is not supported, drrs_type has to be set to 0.
535 * This is because, VBT is configured in such a way that
536 * static DRRS is 0 and DRRS not supported is represented by
537 * driver->drrs_enabled=false
538 */
539 if (!driver->drrs_enabled)
540 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
541 }
542
543 static void
544 parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
545 {
546 const struct bdb_edp *edp;
547 const struct edp_power_seq *edp_pps;
548 const struct edp_link_params *edp_link_params;
549
550 edp = find_section(bdb, BDB_EDP);
551 if (!edp) {
552 if (dev_priv->vbt.edp.support)
553 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
554 return;
555 }
556
557 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
558 case EDP_18BPP:
559 dev_priv->vbt.edp.bpp = 18;
560 break;
561 case EDP_24BPP:
562 dev_priv->vbt.edp.bpp = 24;
563 break;
564 case EDP_30BPP:
565 dev_priv->vbt.edp.bpp = 30;
566 break;
567 }
568
569 /* Get the eDP sequencing and link info */
570 edp_pps = &edp->power_seqs[panel_type];
571 edp_link_params = &edp->link_params[panel_type];
572
573 dev_priv->vbt.edp.pps = *edp_pps;
574
575 switch (edp_link_params->rate) {
576 case EDP_RATE_1_62:
577 dev_priv->vbt.edp.rate = DP_LINK_BW_1_62;
578 break;
579 case EDP_RATE_2_7:
580 dev_priv->vbt.edp.rate = DP_LINK_BW_2_7;
581 break;
582 default:
583 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
584 edp_link_params->rate);
585 break;
586 }
587
588 switch (edp_link_params->lanes) {
589 case EDP_LANE_1:
590 dev_priv->vbt.edp.lanes = 1;
591 break;
592 case EDP_LANE_2:
593 dev_priv->vbt.edp.lanes = 2;
594 break;
595 case EDP_LANE_4:
596 dev_priv->vbt.edp.lanes = 4;
597 break;
598 default:
599 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
600 edp_link_params->lanes);
601 break;
602 }
603
604 switch (edp_link_params->preemphasis) {
605 case EDP_PREEMPHASIS_NONE:
606 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
607 break;
608 case EDP_PREEMPHASIS_3_5dB:
609 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
610 break;
611 case EDP_PREEMPHASIS_6dB:
612 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
613 break;
614 case EDP_PREEMPHASIS_9_5dB:
615 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
616 break;
617 default:
618 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
619 edp_link_params->preemphasis);
620 break;
621 }
622
623 switch (edp_link_params->vswing) {
624 case EDP_VSWING_0_4V:
625 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
626 break;
627 case EDP_VSWING_0_6V:
628 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
629 break;
630 case EDP_VSWING_0_8V:
631 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
632 break;
633 case EDP_VSWING_1_2V:
634 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
635 break;
636 default:
637 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
638 edp_link_params->vswing);
639 break;
640 }
641
642 if (bdb->version >= 173) {
643 uint8_t vswing;
644
645 /* Don't read from VBT if module parameter has valid value*/
646 if (i915.edp_vswing) {
647 dev_priv->vbt.edp.low_vswing = i915.edp_vswing == 1;
648 } else {
649 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
650 dev_priv->vbt.edp.low_vswing = vswing == 0;
651 }
652 }
653 }
654
655 static void
656 parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
657 {
658 const struct bdb_psr *psr;
659 const struct psr_table *psr_table;
660
661 psr = find_section(bdb, BDB_PSR);
662 if (!psr) {
663 DRM_DEBUG_KMS("No PSR BDB found.\n");
664 return;
665 }
666
667 psr_table = &psr->psr_table[panel_type];
668
669 dev_priv->vbt.psr.full_link = psr_table->full_link;
670 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
671
672 /* Allowed VBT values goes from 0 to 15 */
673 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
674 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
675
676 switch (psr_table->lines_to_wait) {
677 case 0:
678 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
679 break;
680 case 1:
681 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
682 break;
683 case 2:
684 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
685 break;
686 case 3:
687 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
688 break;
689 default:
690 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
691 psr_table->lines_to_wait);
692 break;
693 }
694
695 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
696 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
697 }
698
699 static void
700 parse_mipi_config(struct drm_i915_private *dev_priv,
701 const struct bdb_header *bdb)
702 {
703 const struct bdb_mipi_config *start;
704 const struct mipi_config *config;
705 const struct mipi_pps_data *pps;
706
707 /* parse MIPI blocks only if LFP type is MIPI */
708 if (!intel_bios_is_dsi_present(dev_priv, NULL))
709 return;
710
711 /* Initialize this to undefined indicating no generic MIPI support */
712 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
713
714 /* Block #40 is already parsed and panel_fixed_mode is
715 * stored in dev_priv->lfp_lvds_vbt_mode
716 * resuse this when needed
717 */
718
719 /* Parse #52 for panel index used from panel_type already
720 * parsed
721 */
722 start = find_section(bdb, BDB_MIPI_CONFIG);
723 if (!start) {
724 DRM_DEBUG_KMS("No MIPI config BDB found");
725 return;
726 }
727
728 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
729 panel_type);
730
731 /*
732 * get hold of the correct configuration block and pps data as per
733 * the panel_type as index
734 */
735 config = &start->config[panel_type];
736 pps = &start->pps[panel_type];
737
738 /* store as of now full data. Trim when we realise all is not needed */
739 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
740 if (!dev_priv->vbt.dsi.config)
741 return;
742
743 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
744 if (!dev_priv->vbt.dsi.pps) {
745 kfree(dev_priv->vbt.dsi.config);
746 return;
747 }
748
749 /* We have mandatory mipi config blocks. Initialize as generic panel */
750 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
751 }
752
753 /* Find the sequence block and size for the given panel. */
754 static const u8 *
755 find_panel_sequence_block(const struct bdb_mipi_sequence *sequence,
756 u16 panel_id, u32 *seq_size)
757 {
758 u32 total = get_blocksize(sequence);
759 const u8 *data = &sequence->data[0];
760 u8 current_id;
761 u32 current_size;
762 int header_size = sequence->version >= 3 ? 5 : 3;
763 int index = 0;
764 int i;
765
766 /* skip new block size */
767 if (sequence->version >= 3)
768 data += 4;
769
770 for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) {
771 if (index + header_size > total) {
772 DRM_ERROR("Invalid sequence block (header)\n");
773 return NULL;
774 }
775
776 current_id = *(data + index);
777 if (sequence->version >= 3)
778 current_size = *((const u32 *)(data + index + 1));
779 else
780 current_size = *((const u16 *)(data + index + 1));
781
782 index += header_size;
783
784 if (index + current_size > total) {
785 DRM_ERROR("Invalid sequence block\n");
786 return NULL;
787 }
788
789 if (current_id == panel_id) {
790 *seq_size = current_size;
791 return data + index;
792 }
793
794 index += current_size;
795 }
796
797 DRM_ERROR("Sequence block detected but no valid configuration\n");
798
799 return NULL;
800 }
801
802 static int goto_next_sequence(const u8 *data, int index, int total)
803 {
804 u16 len;
805
806 /* Skip Sequence Byte. */
807 for (index = index + 1; index < total; index += len) {
808 u8 operation_byte = *(data + index);
809 index++;
810
811 switch (operation_byte) {
812 case MIPI_SEQ_ELEM_END:
813 return index;
814 case MIPI_SEQ_ELEM_SEND_PKT:
815 if (index + 4 > total)
816 return 0;
817
818 len = *((const u16 *)(data + index + 2)) + 4;
819 break;
820 case MIPI_SEQ_ELEM_DELAY:
821 len = 4;
822 break;
823 case MIPI_SEQ_ELEM_GPIO:
824 len = 2;
825 break;
826 case MIPI_SEQ_ELEM_I2C:
827 if (index + 7 > total)
828 return 0;
829 len = *(data + index + 6) + 7;
830 break;
831 default:
832 DRM_ERROR("Unknown operation byte\n");
833 return 0;
834 }
835 }
836
837 return 0;
838 }
839
840 static int goto_next_sequence_v3(const u8 *data, int index, int total)
841 {
842 int seq_end;
843 u16 len;
844 u32 size_of_sequence;
845
846 /*
847 * Could skip sequence based on Size of Sequence alone, but also do some
848 * checking on the structure.
849 */
850 if (total < 5) {
851 DRM_ERROR("Too small sequence size\n");
852 return 0;
853 }
854
855 /* Skip Sequence Byte. */
856 index++;
857
858 /*
859 * Size of Sequence. Excludes the Sequence Byte and the size itself,
860 * includes MIPI_SEQ_ELEM_END byte, excludes the final MIPI_SEQ_END
861 * byte.
862 */
863 size_of_sequence = *((const uint32_t *)(data + index));
864 index += 4;
865
866 seq_end = index + size_of_sequence;
867 if (seq_end > total) {
868 DRM_ERROR("Invalid sequence size\n");
869 return 0;
870 }
871
872 for (; index < total; index += len) {
873 u8 operation_byte = *(data + index);
874 index++;
875
876 if (operation_byte == MIPI_SEQ_ELEM_END) {
877 if (index != seq_end) {
878 DRM_ERROR("Invalid element structure\n");
879 return 0;
880 }
881 return index;
882 }
883
884 len = *(data + index);
885 index++;
886
887 /*
888 * FIXME: Would be nice to check elements like for v1/v2 in
889 * goto_next_sequence() above.
890 */
891 switch (operation_byte) {
892 case MIPI_SEQ_ELEM_SEND_PKT:
893 case MIPI_SEQ_ELEM_DELAY:
894 case MIPI_SEQ_ELEM_GPIO:
895 case MIPI_SEQ_ELEM_I2C:
896 case MIPI_SEQ_ELEM_SPI:
897 case MIPI_SEQ_ELEM_PMIC:
898 break;
899 default:
900 DRM_ERROR("Unknown operation byte %u\n",
901 operation_byte);
902 break;
903 }
904 }
905
906 return 0;
907 }
908
909 static void
910 parse_mipi_sequence(struct drm_i915_private *dev_priv,
911 const struct bdb_header *bdb)
912 {
913 const struct bdb_mipi_sequence *sequence;
914 const u8 *seq_data;
915 u32 seq_size;
916 u8 *data;
917 int index = 0;
918
919 /* Only our generic panel driver uses the sequence block. */
920 if (dev_priv->vbt.dsi.panel_id != MIPI_DSI_GENERIC_PANEL_ID)
921 return;
922
923 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
924 if (!sequence) {
925 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
926 return;
927 }
928
929 /* Fail gracefully for forward incompatible sequence block. */
930 if (sequence->version >= 4) {
931 DRM_ERROR("Unable to parse MIPI Sequence Block v%u\n",
932 sequence->version);
933 return;
934 }
935
936 DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence->version);
937
938 seq_data = find_panel_sequence_block(sequence, panel_type, &seq_size);
939 if (!seq_data)
940 return;
941
942 data = kmemdup(seq_data, seq_size, GFP_KERNEL);
943 if (!data)
944 return;
945
946 /* Parse the sequences, store pointers to each sequence. */
947 for (;;) {
948 u8 seq_id = *(data + index);
949 if (seq_id == MIPI_SEQ_END)
950 break;
951
952 if (seq_id >= MIPI_SEQ_MAX) {
953 DRM_ERROR("Unknown sequence %u\n", seq_id);
954 goto err;
955 }
956
957 dev_priv->vbt.dsi.sequence[seq_id] = data + index;
958
959 if (sequence->version >= 3)
960 index = goto_next_sequence_v3(data, index, seq_size);
961 else
962 index = goto_next_sequence(data, index, seq_size);
963 if (!index) {
964 DRM_ERROR("Invalid sequence %u\n", seq_id);
965 goto err;
966 }
967 }
968
969 dev_priv->vbt.dsi.data = data;
970 dev_priv->vbt.dsi.size = seq_size;
971 dev_priv->vbt.dsi.seq_version = sequence->version;
972
973 DRM_DEBUG_DRIVER("MIPI related VBT parsing complete\n");
974 return;
975
976 err:
977 kfree(data);
978 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
979 }
980
981 static u8 translate_iboost(u8 val)
982 {
983 static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
984
985 if (val >= ARRAY_SIZE(mapping)) {
986 DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
987 return 0;
988 }
989 return mapping[val];
990 }
991
992 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
993 const struct bdb_header *bdb)
994 {
995 union child_device_config *it, *child = NULL;
996 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
997 uint8_t hdmi_level_shift;
998 int i, j;
999 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
1000 uint8_t aux_channel, ddc_pin;
1001 /* Each DDI port can have more than one value on the "DVO Port" field,
1002 * so look for all the possible values for each port and abort if more
1003 * than one is found. */
1004 int dvo_ports[][3] = {
1005 {DVO_PORT_HDMIA, DVO_PORT_DPA, -1},
1006 {DVO_PORT_HDMIB, DVO_PORT_DPB, -1},
1007 {DVO_PORT_HDMIC, DVO_PORT_DPC, -1},
1008 {DVO_PORT_HDMID, DVO_PORT_DPD, -1},
1009 {DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE},
1010 };
1011
1012 /* Find the child device to use, abort if more than one found. */
1013 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1014 it = dev_priv->vbt.child_dev + i;
1015
1016 for (j = 0; j < 3; j++) {
1017 if (dvo_ports[port][j] == -1)
1018 break;
1019
1020 if (it->common.dvo_port == dvo_ports[port][j]) {
1021 if (child) {
1022 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
1023 port_name(port));
1024 return;
1025 }
1026 child = it;
1027 }
1028 }
1029 }
1030 if (!child)
1031 return;
1032
1033 aux_channel = child->raw[25];
1034 ddc_pin = child->common.ddc_pin;
1035
1036 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
1037 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
1038 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
1039 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
1040 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
1041
1042 info->supports_dvi = is_dvi;
1043 info->supports_hdmi = is_hdmi;
1044 info->supports_dp = is_dp;
1045
1046 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
1047 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
1048
1049 if (is_edp && is_dvi)
1050 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
1051 port_name(port));
1052 if (is_crt && port != PORT_E)
1053 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
1054 if (is_crt && (is_dvi || is_dp))
1055 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
1056 port_name(port));
1057 if (is_dvi && (port == PORT_A || port == PORT_E))
1058 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
1059 if (!is_dvi && !is_dp && !is_crt)
1060 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
1061 port_name(port));
1062 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
1063 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
1064
1065 if (is_dvi) {
1066 if (port == PORT_E) {
1067 info->alternate_ddc_pin = ddc_pin;
1068 /* if DDIE share ddc pin with other port, then
1069 * dvi/hdmi couldn't exist on the shared port.
1070 * Otherwise they share the same ddc bin and system
1071 * couldn't communicate with them seperately. */
1072 if (ddc_pin == DDC_PIN_B) {
1073 dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
1074 dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
1075 } else if (ddc_pin == DDC_PIN_C) {
1076 dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
1077 dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
1078 } else if (ddc_pin == DDC_PIN_D) {
1079 dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
1080 dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
1081 }
1082 } else if (ddc_pin == DDC_PIN_B && port != PORT_B)
1083 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
1084 else if (ddc_pin == DDC_PIN_C && port != PORT_C)
1085 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
1086 else if (ddc_pin == DDC_PIN_D && port != PORT_D)
1087 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
1088 }
1089
1090 if (is_dp) {
1091 if (port == PORT_E) {
1092 info->alternate_aux_channel = aux_channel;
1093 /* if DDIE share aux channel with other port, then
1094 * DP couldn't exist on the shared port. Otherwise
1095 * they share the same aux channel and system
1096 * couldn't communicate with them seperately. */
1097 if (aux_channel == DP_AUX_A)
1098 dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0;
1099 else if (aux_channel == DP_AUX_B)
1100 dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0;
1101 else if (aux_channel == DP_AUX_C)
1102 dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0;
1103 else if (aux_channel == DP_AUX_D)
1104 dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0;
1105 }
1106 else if (aux_channel == DP_AUX_A && port != PORT_A)
1107 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
1108 else if (aux_channel == DP_AUX_B && port != PORT_B)
1109 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
1110 else if (aux_channel == DP_AUX_C && port != PORT_C)
1111 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
1112 else if (aux_channel == DP_AUX_D && port != PORT_D)
1113 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
1114 }
1115
1116 if (bdb->version >= 158) {
1117 /* The VBT HDMI level shift values match the table we have. */
1118 hdmi_level_shift = child->raw[7] & 0xF;
1119 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1120 port_name(port),
1121 hdmi_level_shift);
1122 info->hdmi_level_shift = hdmi_level_shift;
1123 }
1124
1125 /* Parse the I_boost config for SKL and above */
1126 if (bdb->version >= 196 && child->common.iboost) {
1127 info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF);
1128 DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
1129 port_name(port), info->dp_boost_level);
1130 info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4);
1131 DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
1132 port_name(port), info->hdmi_boost_level);
1133 }
1134 }
1135
1136 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
1137 const struct bdb_header *bdb)
1138 {
1139 enum port port;
1140
1141 if (!HAS_DDI(dev_priv))
1142 return;
1143
1144 if (!dev_priv->vbt.child_dev_num)
1145 return;
1146
1147 if (bdb->version < 155)
1148 return;
1149
1150 for (port = PORT_A; port < I915_MAX_PORTS; port++)
1151 parse_ddi_port(dev_priv, port, bdb);
1152 }
1153
1154 static void
1155 parse_device_mapping(struct drm_i915_private *dev_priv,
1156 const struct bdb_header *bdb)
1157 {
1158 const struct bdb_general_definitions *p_defs;
1159 const union child_device_config *p_child;
1160 union child_device_config *child_dev_ptr;
1161 int i, child_device_num, count;
1162 u8 expected_size;
1163 u16 block_size;
1164
1165 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1166 if (!p_defs) {
1167 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1168 return;
1169 }
1170 if (bdb->version < 106) {
1171 expected_size = 22;
1172 } else if (bdb->version < 109) {
1173 expected_size = 27;
1174 } else if (bdb->version < 195) {
1175 BUILD_BUG_ON(sizeof(struct old_child_dev_config) != 33);
1176 expected_size = sizeof(struct old_child_dev_config);
1177 } else if (bdb->version == 195) {
1178 expected_size = 37;
1179 } else if (bdb->version <= 197) {
1180 expected_size = 38;
1181 } else {
1182 expected_size = 38;
1183 BUILD_BUG_ON(sizeof(*p_child) < 38);
1184 DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
1185 bdb->version, expected_size);
1186 }
1187
1188 /* Flag an error for unexpected size, but continue anyway. */
1189 if (p_defs->child_dev_size != expected_size)
1190 DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n",
1191 p_defs->child_dev_size, expected_size, bdb->version);
1192
1193 /* The legacy sized child device config is the minimum we need. */
1194 if (p_defs->child_dev_size < sizeof(struct old_child_dev_config)) {
1195 DRM_DEBUG_KMS("Child device config size %u is too small.\n",
1196 p_defs->child_dev_size);
1197 return;
1198 }
1199
1200 /* get the block size of general definitions */
1201 block_size = get_blocksize(p_defs);
1202 /* get the number of child device */
1203 child_device_num = (block_size - sizeof(*p_defs)) /
1204 p_defs->child_dev_size;
1205 count = 0;
1206 /* get the number of child device that is present */
1207 for (i = 0; i < child_device_num; i++) {
1208 p_child = child_device_ptr(p_defs, i);
1209 if (!p_child->common.device_type) {
1210 /* skip the device block if device type is invalid */
1211 continue;
1212 }
1213 count++;
1214 }
1215 if (!count) {
1216 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1217 return;
1218 }
1219 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1220 if (!dev_priv->vbt.child_dev) {
1221 DRM_DEBUG_KMS("No memory space for child device\n");
1222 return;
1223 }
1224
1225 dev_priv->vbt.child_dev_num = count;
1226 count = 0;
1227 for (i = 0; i < child_device_num; i++) {
1228 p_child = child_device_ptr(p_defs, i);
1229 if (!p_child->common.device_type) {
1230 /* skip the device block if device type is invalid */
1231 continue;
1232 }
1233
1234 child_dev_ptr = dev_priv->vbt.child_dev + count;
1235 count++;
1236
1237 /*
1238 * Copy as much as we know (sizeof) and is available
1239 * (child_dev_size) of the child device. Accessing the data must
1240 * depend on VBT version.
1241 */
1242 memcpy(child_dev_ptr, p_child,
1243 min_t(size_t, p_defs->child_dev_size, sizeof(*p_child)));
1244
1245 /*
1246 * copied full block, now init values when they are not
1247 * available in current version
1248 */
1249 if (bdb->version < 196) {
1250 /* Set default values for bits added from v196 */
1251 child_dev_ptr->common.iboost = 0;
1252 child_dev_ptr->common.hpd_invert = 0;
1253 }
1254
1255 if (bdb->version < 192)
1256 child_dev_ptr->common.lspcon = 0;
1257 }
1258 return;
1259 }
1260
1261 static void
1262 init_vbt_defaults(struct drm_i915_private *dev_priv)
1263 {
1264 enum port port;
1265
1266 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
1267
1268 /* Default to having backlight */
1269 dev_priv->vbt.backlight.present = true;
1270
1271 /* LFP panel data */
1272 dev_priv->vbt.lvds_dither = 1;
1273 dev_priv->vbt.lvds_vbt = 0;
1274
1275 /* SDVO panel data */
1276 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1277
1278 /* general features */
1279 dev_priv->vbt.int_tv_support = 1;
1280 dev_priv->vbt.int_crt_support = 1;
1281
1282 /* Default to using SSC */
1283 dev_priv->vbt.lvds_use_ssc = 1;
1284 /*
1285 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1286 * clock for LVDS.
1287 */
1288 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev_priv,
1289 !HAS_PCH_SPLIT(dev_priv));
1290 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1291
1292 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1293 struct ddi_vbt_port_info *info =
1294 &dev_priv->vbt.ddi_port_info[port];
1295
1296 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1297
1298 info->supports_dvi = (port != PORT_A && port != PORT_E);
1299 info->supports_hdmi = info->supports_dvi;
1300 info->supports_dp = (port != PORT_E);
1301 }
1302 }
1303
1304 static const struct bdb_header *get_bdb_header(const struct vbt_header *vbt)
1305 {
1306 const void *_vbt = vbt;
1307
1308 return _vbt + vbt->bdb_offset;
1309 }
1310
1311 /**
1312 * intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
1313 * @buf: pointer to a buffer to validate
1314 * @size: size of the buffer
1315 *
1316 * Returns true on valid VBT.
1317 */
1318 bool intel_bios_is_valid_vbt(const void *buf, size_t size)
1319 {
1320 const struct vbt_header *vbt = buf;
1321 const struct bdb_header *bdb;
1322
1323 if (!vbt)
1324 return false;
1325
1326 if (sizeof(struct vbt_header) > size) {
1327 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1328 return false;
1329 }
1330
1331 if (memcmp(vbt->signature, "$VBT", 4)) {
1332 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1333 return false;
1334 }
1335
1336 if (vbt->bdb_offset + sizeof(struct bdb_header) > size) {
1337 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1338 return false;
1339 }
1340
1341 bdb = get_bdb_header(vbt);
1342 if (vbt->bdb_offset + bdb->bdb_size > size) {
1343 DRM_DEBUG_DRIVER("BDB incomplete\n");
1344 return false;
1345 }
1346
1347 return vbt;
1348 }
1349
1350 static const struct vbt_header *find_vbt(void __iomem *bios, size_t size)
1351 {
1352 size_t i;
1353
1354 /* Scour memory looking for the VBT signature. */
1355 for (i = 0; i + 4 < size; i++) {
1356 void *vbt;
1357
1358 if (ioread32(bios + i) != *((const u32 *) "$VBT"))
1359 continue;
1360
1361 /*
1362 * This is the one place where we explicitly discard the address
1363 * space (__iomem) of the BIOS/VBT.
1364 */
1365 vbt = (void __force *) bios + i;
1366 if (intel_bios_is_valid_vbt(vbt, size - i))
1367 return vbt;
1368
1369 break;
1370 }
1371
1372 return NULL;
1373 }
1374
1375 /**
1376 * intel_bios_init - find VBT and initialize settings from the BIOS
1377 * @dev_priv: i915 device instance
1378 *
1379 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1380 * to appropriate values.
1381 *
1382 * Returns 0 on success, nonzero on failure.
1383 */
1384 int
1385 intel_bios_init(struct drm_i915_private *dev_priv)
1386 {
1387 struct pci_dev *pdev = dev_priv->dev->pdev;
1388 const struct vbt_header *vbt = dev_priv->opregion.vbt;
1389 const struct bdb_header *bdb;
1390 u8 __iomem *bios = NULL;
1391
1392 if (HAS_PCH_NOP(dev_priv))
1393 return -ENODEV;
1394
1395 init_vbt_defaults(dev_priv);
1396
1397 if (!vbt) {
1398 size_t size;
1399
1400 bios = pci_map_rom(pdev, &size);
1401 if (!bios)
1402 return -1;
1403
1404 vbt = find_vbt(bios, size);
1405 if (!vbt) {
1406 pci_unmap_rom(pdev, bios);
1407 return -1;
1408 }
1409
1410 DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
1411 }
1412
1413 bdb = get_bdb_header(vbt);
1414
1415 DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
1416 (int)sizeof(vbt->signature), vbt->signature, bdb->version);
1417
1418 /* Grab useful general definitions */
1419 parse_general_features(dev_priv, bdb);
1420 parse_general_definitions(dev_priv, bdb);
1421 parse_lfp_panel_data(dev_priv, bdb);
1422 parse_lfp_backlight(dev_priv, bdb);
1423 parse_sdvo_panel_data(dev_priv, bdb);
1424 parse_sdvo_device_mapping(dev_priv, bdb);
1425 parse_device_mapping(dev_priv, bdb);
1426 parse_driver_features(dev_priv, bdb);
1427 parse_edp(dev_priv, bdb);
1428 parse_psr(dev_priv, bdb);
1429 parse_mipi_config(dev_priv, bdb);
1430 parse_mipi_sequence(dev_priv, bdb);
1431 parse_ddi_ports(dev_priv, bdb);
1432
1433 if (bios)
1434 pci_unmap_rom(pdev, bios);
1435
1436 return 0;
1437 }
1438
1439 /**
1440 * intel_bios_is_tv_present - is integrated TV present in VBT
1441 * @dev_priv: i915 device instance
1442 *
1443 * Return true if TV is present. If no child devices were parsed from VBT,
1444 * assume TV is present.
1445 */
1446 bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv)
1447 {
1448 union child_device_config *p_child;
1449 int i;
1450
1451 if (!dev_priv->vbt.int_tv_support)
1452 return false;
1453
1454 if (!dev_priv->vbt.child_dev_num)
1455 return true;
1456
1457 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1458 p_child = dev_priv->vbt.child_dev + i;
1459 /*
1460 * If the device type is not TV, continue.
1461 */
1462 switch (p_child->old.device_type) {
1463 case DEVICE_TYPE_INT_TV:
1464 case DEVICE_TYPE_TV:
1465 case DEVICE_TYPE_TV_SVIDEO_COMPOSITE:
1466 break;
1467 default:
1468 continue;
1469 }
1470 /* Only when the addin_offset is non-zero, it is regarded
1471 * as present.
1472 */
1473 if (p_child->old.addin_offset)
1474 return true;
1475 }
1476
1477 return false;
1478 }
1479
1480 /**
1481 * intel_bios_is_lvds_present - is LVDS present in VBT
1482 * @dev_priv: i915 device instance
1483 * @i2c_pin: i2c pin for LVDS if present
1484 *
1485 * Return true if LVDS is present. If no child devices were parsed from VBT,
1486 * assume LVDS is present.
1487 */
1488 bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin)
1489 {
1490 int i;
1491
1492 if (!dev_priv->vbt.child_dev_num)
1493 return true;
1494
1495 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1496 union child_device_config *uchild = dev_priv->vbt.child_dev + i;
1497 struct old_child_dev_config *child = &uchild->old;
1498
1499 /* If the device type is not LFP, continue.
1500 * We have to check both the new identifiers as well as the
1501 * old for compatibility with some BIOSes.
1502 */
1503 if (child->device_type != DEVICE_TYPE_INT_LFP &&
1504 child->device_type != DEVICE_TYPE_LFP)
1505 continue;
1506
1507 if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
1508 *i2c_pin = child->i2c_pin;
1509
1510 /* However, we cannot trust the BIOS writers to populate
1511 * the VBT correctly. Since LVDS requires additional
1512 * information from AIM blocks, a non-zero addin offset is
1513 * a good indicator that the LVDS is actually present.
1514 */
1515 if (child->addin_offset)
1516 return true;
1517
1518 /* But even then some BIOS writers perform some black magic
1519 * and instantiate the device without reference to any
1520 * additional data. Trust that if the VBT was written into
1521 * the OpRegion then they have validated the LVDS's existence.
1522 */
1523 if (dev_priv->opregion.vbt)
1524 return true;
1525 }
1526
1527 return false;
1528 }
1529
1530 /**
1531 * intel_bios_is_port_edp - is the device in given port eDP
1532 * @dev_priv: i915 device instance
1533 * @port: port to check
1534 *
1535 * Return true if the device in %port is eDP.
1536 */
1537 bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
1538 {
1539 union child_device_config *p_child;
1540 static const short port_mapping[] = {
1541 [PORT_B] = DVO_PORT_DPB,
1542 [PORT_C] = DVO_PORT_DPC,
1543 [PORT_D] = DVO_PORT_DPD,
1544 [PORT_E] = DVO_PORT_DPE,
1545 };
1546 int i;
1547
1548 if (!dev_priv->vbt.child_dev_num)
1549 return false;
1550
1551 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1552 p_child = dev_priv->vbt.child_dev + i;
1553
1554 if (p_child->common.dvo_port == port_mapping[port] &&
1555 (p_child->common.device_type & DEVICE_TYPE_eDP_BITS) ==
1556 (DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS))
1557 return true;
1558 }
1559
1560 return false;
1561 }
1562
1563 /**
1564 * intel_bios_is_dsi_present - is DSI present in VBT
1565 * @dev_priv: i915 device instance
1566 * @port: port for DSI if present
1567 *
1568 * Return true if DSI is present, and return the port in %port.
1569 */
1570 bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
1571 enum port *port)
1572 {
1573 union child_device_config *p_child;
1574 u8 dvo_port;
1575 int i;
1576
1577 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1578 p_child = dev_priv->vbt.child_dev + i;
1579
1580 if (!(p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT))
1581 continue;
1582
1583 dvo_port = p_child->common.dvo_port;
1584
1585 switch (dvo_port) {
1586 case DVO_PORT_MIPIA:
1587 case DVO_PORT_MIPIC:
1588 if (port)
1589 *port = dvo_port - DVO_PORT_MIPIA;
1590 return true;
1591 case DVO_PORT_MIPIB:
1592 case DVO_PORT_MIPID:
1593 DRM_DEBUG_KMS("VBT has unsupported DSI port %c\n",
1594 port_name(dvo_port - DVO_PORT_MIPIA));
1595 break;
1596 }
1597 }
1598
1599 return false;
1600 }
1601
1602 /**
1603 * intel_bios_is_port_hpd_inverted - is HPD inverted for %port
1604 * @dev_priv: i915 device instance
1605 * @port: port to check
1606 *
1607 * Return true if HPD should be inverted for %port.
1608 */
1609 bool
1610 intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
1611 enum port port)
1612 {
1613 int i;
1614
1615 if (WARN_ON_ONCE(!IS_BROXTON(dev_priv)))
1616 return false;
1617
1618 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1619 if (!dev_priv->vbt.child_dev[i].common.hpd_invert)
1620 continue;
1621
1622 switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
1623 case DVO_PORT_DPA:
1624 case DVO_PORT_HDMIA:
1625 if (port == PORT_A)
1626 return true;
1627 break;
1628 case DVO_PORT_DPB:
1629 case DVO_PORT_HDMIB:
1630 if (port == PORT_B)
1631 return true;
1632 break;
1633 case DVO_PORT_DPC:
1634 case DVO_PORT_HDMIC:
1635 if (port == PORT_C)
1636 return true;
1637 break;
1638 default:
1639 break;
1640 }
1641 }
1642
1643 return false;
1644 }
Linux kernel - Deliverables
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