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drm/i915: Replace the static panel_type variable with dev_priv->vbt.panel_type
[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 /* Get BDB block size given a pointer to Block ID. */
62 static u32 _get_blocksize(const u8 *block_base)
63 {
64 /* The MIPI Sequence Block v3+ has a separate size field. */
65 if (*block_base == BDB_MIPI_SEQUENCE && *(block_base + 3) >= 3)
66 return *((const u32 *)(block_base + 4));
67 else
68 return *((const u16 *)(block_base + 1));
69 }
70
71 /* Get BDB block size give a pointer to data after Block ID and Block Size. */
72 static u32 get_blocksize(const void *block_data)
73 {
74 return _get_blocksize(block_data - 3);
75 }
76
77 static const void *
78 find_section(const void *_bdb, int section_id)
79 {
80 const struct bdb_header *bdb = _bdb;
81 const u8 *base = _bdb;
82 int index = 0;
83 u32 total, current_size;
84 u8 current_id;
85
86 /* skip to first section */
87 index += bdb->header_size;
88 total = bdb->bdb_size;
89
90 /* walk the sections looking for section_id */
91 while (index + 3 < total) {
92 current_id = *(base + index);
93 current_size = _get_blocksize(base + index);
94 index += 3;
95
96 if (index + current_size > total)
97 return NULL;
98
99 if (current_id == section_id)
100 return base + index;
101
102 index += current_size;
103 }
104
105 return NULL;
106 }
107
108 static void
109 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
110 const struct lvds_dvo_timing *dvo_timing)
111 {
112 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
113 dvo_timing->hactive_lo;
114 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
115 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
116 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
117 dvo_timing->hsync_pulse_width;
118 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
119 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
120
121 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
122 dvo_timing->vactive_lo;
123 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
124 dvo_timing->vsync_off;
125 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
126 dvo_timing->vsync_pulse_width;
127 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
128 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
129 panel_fixed_mode->clock = dvo_timing->clock * 10;
130 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
131
132 if (dvo_timing->hsync_positive)
133 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
134 else
135 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
136
137 if (dvo_timing->vsync_positive)
138 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
139 else
140 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
141
142 /* Some VBTs have bogus h/vtotal values */
143 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
144 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
145 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
146 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
147
148 drm_mode_set_name(panel_fixed_mode);
149 }
150
151 static const struct lvds_dvo_timing *
152 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
153 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
154 int index)
155 {
156 /*
157 * the size of fp_timing varies on the different platform.
158 * So calculate the DVO timing relative offset in LVDS data
159 * entry to get the DVO timing entry
160 */
161
162 int lfp_data_size =
163 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
164 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
165 int dvo_timing_offset =
166 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
167 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
168 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
169
170 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
171 }
172
173 /* get lvds_fp_timing entry
174 * this function may return NULL if the corresponding entry is invalid
175 */
176 static const struct lvds_fp_timing *
177 get_lvds_fp_timing(const struct bdb_header *bdb,
178 const struct bdb_lvds_lfp_data *data,
179 const struct bdb_lvds_lfp_data_ptrs *ptrs,
180 int index)
181 {
182 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
183 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
184 size_t ofs;
185
186 if (index >= ARRAY_SIZE(ptrs->ptr))
187 return NULL;
188 ofs = ptrs->ptr[index].fp_timing_offset;
189 if (ofs < data_ofs ||
190 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
191 return NULL;
192 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
193 }
194
195 /* Try to find integrated panel data */
196 static void
197 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
198 const struct bdb_header *bdb)
199 {
200 const struct bdb_lvds_options *lvds_options;
201 const struct bdb_lvds_lfp_data *lvds_lfp_data;
202 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
203 const struct lvds_dvo_timing *panel_dvo_timing;
204 const struct lvds_fp_timing *fp_timing;
205 struct drm_display_mode *panel_fixed_mode;
206 int panel_type;
207 int drrs_mode;
208
209 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
210 if (!lvds_options)
211 return;
212
213 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
214 if (lvds_options->panel_type > 0xf) {
215 DRM_DEBUG_KMS("Invalid VBT panel type 0x%x\n",
216 lvds_options->panel_type);
217 return;
218 }
219
220 panel_type = lvds_options->panel_type;
221 dev_priv->vbt.panel_type = panel_type;
222
223 drrs_mode = (lvds_options->dps_panel_type_bits
224 >> (panel_type * 2)) & MODE_MASK;
225 /*
226 * VBT has static DRRS = 0 and seamless DRRS = 2.
227 * The below piece of code is required to adjust vbt.drrs_type
228 * to match the enum drrs_support_type.
229 */
230 switch (drrs_mode) {
231 case 0:
232 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
233 DRM_DEBUG_KMS("DRRS supported mode is static\n");
234 break;
235 case 2:
236 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
237 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
238 break;
239 default:
240 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
241 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
242 break;
243 }
244
245 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
246 if (!lvds_lfp_data)
247 return;
248
249 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
250 if (!lvds_lfp_data_ptrs)
251 return;
252
253 dev_priv->vbt.lvds_vbt = 1;
254
255 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
256 lvds_lfp_data_ptrs,
257 panel_type);
258
259 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
260 if (!panel_fixed_mode)
261 return;
262
263 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
264
265 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
266
267 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
268 drm_mode_debug_printmodeline(panel_fixed_mode);
269
270 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
271 lvds_lfp_data_ptrs,
272 panel_type);
273 if (fp_timing) {
274 /* check the resolution, just to be sure */
275 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
276 fp_timing->y_res == panel_fixed_mode->vdisplay) {
277 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
278 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
279 dev_priv->vbt.bios_lvds_val);
280 }
281 }
282 }
283
284 static void
285 parse_lfp_backlight(struct drm_i915_private *dev_priv,
286 const struct bdb_header *bdb)
287 {
288 const struct bdb_lfp_backlight_data *backlight_data;
289 const struct bdb_lfp_backlight_data_entry *entry;
290 int panel_type = dev_priv->vbt.panel_type;
291
292 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
293 if (!backlight_data)
294 return;
295
296 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
297 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
298 backlight_data->entry_size);
299 return;
300 }
301
302 entry = &backlight_data->data[panel_type];
303
304 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
305 if (!dev_priv->vbt.backlight.present) {
306 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
307 entry->type);
308 return;
309 }
310
311 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
312 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
313 dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
314 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
315 "active %s, min brightness %u, level %u\n",
316 dev_priv->vbt.backlight.pwm_freq_hz,
317 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
318 dev_priv->vbt.backlight.min_brightness,
319 backlight_data->level[panel_type]);
320 }
321
322 /* Try to find sdvo panel data */
323 static void
324 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
325 const struct bdb_header *bdb)
326 {
327 const struct lvds_dvo_timing *dvo_timing;
328 struct drm_display_mode *panel_fixed_mode;
329 int index;
330
331 index = i915.vbt_sdvo_panel_type;
332 if (index == -2) {
333 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
334 return;
335 }
336
337 if (index == -1) {
338 const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
339
340 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
341 if (!sdvo_lvds_options)
342 return;
343
344 index = sdvo_lvds_options->panel_type;
345 }
346
347 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
348 if (!dvo_timing)
349 return;
350
351 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
352 if (!panel_fixed_mode)
353 return;
354
355 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
356
357 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
358
359 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
360 drm_mode_debug_printmodeline(panel_fixed_mode);
361 }
362
363 static int intel_bios_ssc_frequency(struct drm_i915_private *dev_priv,
364 bool alternate)
365 {
366 switch (INTEL_INFO(dev_priv)->gen) {
367 case 2:
368 return alternate ? 66667 : 48000;
369 case 3:
370 case 4:
371 return alternate ? 100000 : 96000;
372 default:
373 return alternate ? 100000 : 120000;
374 }
375 }
376
377 static void
378 parse_general_features(struct drm_i915_private *dev_priv,
379 const struct bdb_header *bdb)
380 {
381 const struct bdb_general_features *general;
382
383 general = find_section(bdb, BDB_GENERAL_FEATURES);
384 if (!general)
385 return;
386
387 dev_priv->vbt.int_tv_support = general->int_tv_support;
388 /* int_crt_support can't be trusted on earlier platforms */
389 if (bdb->version >= 155 &&
390 (HAS_DDI(dev_priv) || IS_VALLEYVIEW(dev_priv)))
391 dev_priv->vbt.int_crt_support = general->int_crt_support;
392 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
393 dev_priv->vbt.lvds_ssc_freq =
394 intel_bios_ssc_frequency(dev_priv, general->ssc_freq);
395 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
396 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
397 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",
398 dev_priv->vbt.int_tv_support,
399 dev_priv->vbt.int_crt_support,
400 dev_priv->vbt.lvds_use_ssc,
401 dev_priv->vbt.lvds_ssc_freq,
402 dev_priv->vbt.display_clock_mode,
403 dev_priv->vbt.fdi_rx_polarity_inverted);
404 }
405
406 static void
407 parse_general_definitions(struct drm_i915_private *dev_priv,
408 const struct bdb_header *bdb)
409 {
410 const struct bdb_general_definitions *general;
411
412 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
413 if (general) {
414 u16 block_size = get_blocksize(general);
415 if (block_size >= sizeof(*general)) {
416 int bus_pin = general->crt_ddc_gmbus_pin;
417 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
418 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
419 dev_priv->vbt.crt_ddc_pin = bus_pin;
420 } else {
421 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
422 block_size);
423 }
424 }
425 }
426
427 static const union child_device_config *
428 child_device_ptr(const struct bdb_general_definitions *p_defs, int i)
429 {
430 return (const void *) &p_defs->devices[i * p_defs->child_dev_size];
431 }
432
433 static void
434 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
435 const struct bdb_header *bdb)
436 {
437 struct sdvo_device_mapping *p_mapping;
438 const struct bdb_general_definitions *p_defs;
439 const struct old_child_dev_config *child; /* legacy */
440 int i, child_device_num, count;
441 u16 block_size;
442
443 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
444 if (!p_defs) {
445 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
446 return;
447 }
448
449 /*
450 * Only parse SDVO mappings when the general definitions block child
451 * device size matches that of the *legacy* child device config
452 * struct. Thus, SDVO mapping will be skipped for newer VBT.
453 */
454 if (p_defs->child_dev_size != sizeof(*child)) {
455 DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n");
456 return;
457 }
458 /* get the block size of general definitions */
459 block_size = get_blocksize(p_defs);
460 /* get the number of child device */
461 child_device_num = (block_size - sizeof(*p_defs)) /
462 p_defs->child_dev_size;
463 count = 0;
464 for (i = 0; i < child_device_num; i++) {
465 child = &child_device_ptr(p_defs, i)->old;
466 if (!child->device_type) {
467 /* skip the device block if device type is invalid */
468 continue;
469 }
470 if (child->slave_addr != SLAVE_ADDR1 &&
471 child->slave_addr != SLAVE_ADDR2) {
472 /*
473 * If the slave address is neither 0x70 nor 0x72,
474 * it is not a SDVO device. Skip it.
475 */
476 continue;
477 }
478 if (child->dvo_port != DEVICE_PORT_DVOB &&
479 child->dvo_port != DEVICE_PORT_DVOC) {
480 /* skip the incorrect SDVO port */
481 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
482 continue;
483 }
484 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
485 " %s port\n",
486 child->slave_addr,
487 (child->dvo_port == DEVICE_PORT_DVOB) ?
488 "SDVOB" : "SDVOC");
489 p_mapping = &dev_priv->vbt.sdvo_mappings[child->dvo_port - 1];
490 if (!p_mapping->initialized) {
491 p_mapping->dvo_port = child->dvo_port;
492 p_mapping->slave_addr = child->slave_addr;
493 p_mapping->dvo_wiring = child->dvo_wiring;
494 p_mapping->ddc_pin = child->ddc_pin;
495 p_mapping->i2c_pin = child->i2c_pin;
496 p_mapping->initialized = 1;
497 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
498 p_mapping->dvo_port,
499 p_mapping->slave_addr,
500 p_mapping->dvo_wiring,
501 p_mapping->ddc_pin,
502 p_mapping->i2c_pin);
503 } else {
504 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
505 "two SDVO device.\n");
506 }
507 if (child->slave2_addr) {
508 /* Maybe this is a SDVO device with multiple inputs */
509 /* And the mapping info is not added */
510 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
511 " is a SDVO device with multiple inputs.\n");
512 }
513 count++;
514 }
515
516 if (!count) {
517 /* No SDVO device info is found */
518 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
519 }
520 return;
521 }
522
523 static void
524 parse_driver_features(struct drm_i915_private *dev_priv,
525 const struct bdb_header *bdb)
526 {
527 const struct bdb_driver_features *driver;
528
529 driver = find_section(bdb, BDB_DRIVER_FEATURES);
530 if (!driver)
531 return;
532
533 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
534 dev_priv->vbt.edp.support = 1;
535
536 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
537 /*
538 * If DRRS is not supported, drrs_type has to be set to 0.
539 * This is because, VBT is configured in such a way that
540 * static DRRS is 0 and DRRS not supported is represented by
541 * driver->drrs_enabled=false
542 */
543 if (!driver->drrs_enabled)
544 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
545 }
546
547 static void
548 parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
549 {
550 const struct bdb_edp *edp;
551 const struct edp_power_seq *edp_pps;
552 const struct edp_link_params *edp_link_params;
553 int panel_type = dev_priv->vbt.panel_type;
554
555 edp = find_section(bdb, BDB_EDP);
556 if (!edp) {
557 if (dev_priv->vbt.edp.support)
558 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
559 return;
560 }
561
562 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
563 case EDP_18BPP:
564 dev_priv->vbt.edp.bpp = 18;
565 break;
566 case EDP_24BPP:
567 dev_priv->vbt.edp.bpp = 24;
568 break;
569 case EDP_30BPP:
570 dev_priv->vbt.edp.bpp = 30;
571 break;
572 }
573
574 /* Get the eDP sequencing and link info */
575 edp_pps = &edp->power_seqs[panel_type];
576 edp_link_params = &edp->link_params[panel_type];
577
578 dev_priv->vbt.edp.pps = *edp_pps;
579
580 switch (edp_link_params->rate) {
581 case EDP_RATE_1_62:
582 dev_priv->vbt.edp.rate = DP_LINK_BW_1_62;
583 break;
584 case EDP_RATE_2_7:
585 dev_priv->vbt.edp.rate = DP_LINK_BW_2_7;
586 break;
587 default:
588 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
589 edp_link_params->rate);
590 break;
591 }
592
593 switch (edp_link_params->lanes) {
594 case EDP_LANE_1:
595 dev_priv->vbt.edp.lanes = 1;
596 break;
597 case EDP_LANE_2:
598 dev_priv->vbt.edp.lanes = 2;
599 break;
600 case EDP_LANE_4:
601 dev_priv->vbt.edp.lanes = 4;
602 break;
603 default:
604 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
605 edp_link_params->lanes);
606 break;
607 }
608
609 switch (edp_link_params->preemphasis) {
610 case EDP_PREEMPHASIS_NONE:
611 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
612 break;
613 case EDP_PREEMPHASIS_3_5dB:
614 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
615 break;
616 case EDP_PREEMPHASIS_6dB:
617 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
618 break;
619 case EDP_PREEMPHASIS_9_5dB:
620 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
621 break;
622 default:
623 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
624 edp_link_params->preemphasis);
625 break;
626 }
627
628 switch (edp_link_params->vswing) {
629 case EDP_VSWING_0_4V:
630 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
631 break;
632 case EDP_VSWING_0_6V:
633 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
634 break;
635 case EDP_VSWING_0_8V:
636 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
637 break;
638 case EDP_VSWING_1_2V:
639 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
640 break;
641 default:
642 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
643 edp_link_params->vswing);
644 break;
645 }
646
647 if (bdb->version >= 173) {
648 uint8_t vswing;
649
650 /* Don't read from VBT if module parameter has valid value*/
651 if (i915.edp_vswing) {
652 dev_priv->vbt.edp.low_vswing = i915.edp_vswing == 1;
653 } else {
654 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
655 dev_priv->vbt.edp.low_vswing = vswing == 0;
656 }
657 }
658 }
659
660 static void
661 parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
662 {
663 const struct bdb_psr *psr;
664 const struct psr_table *psr_table;
665 int panel_type = dev_priv->vbt.panel_type;
666
667 psr = find_section(bdb, BDB_PSR);
668 if (!psr) {
669 DRM_DEBUG_KMS("No PSR BDB found.\n");
670 return;
671 }
672
673 psr_table = &psr->psr_table[panel_type];
674
675 dev_priv->vbt.psr.full_link = psr_table->full_link;
676 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
677
678 /* Allowed VBT values goes from 0 to 15 */
679 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
680 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
681
682 switch (psr_table->lines_to_wait) {
683 case 0:
684 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
685 break;
686 case 1:
687 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
688 break;
689 case 2:
690 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
691 break;
692 case 3:
693 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
694 break;
695 default:
696 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
697 psr_table->lines_to_wait);
698 break;
699 }
700
701 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
702 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
703 }
704
705 static void
706 parse_mipi_config(struct drm_i915_private *dev_priv,
707 const struct bdb_header *bdb)
708 {
709 const struct bdb_mipi_config *start;
710 const struct mipi_config *config;
711 const struct mipi_pps_data *pps;
712 int panel_type = dev_priv->vbt.panel_type;
713
714 /* parse MIPI blocks only if LFP type is MIPI */
715 if (!intel_bios_is_dsi_present(dev_priv, NULL))
716 return;
717
718 /* Initialize this to undefined indicating no generic MIPI support */
719 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
720
721 /* Block #40 is already parsed and panel_fixed_mode is
722 * stored in dev_priv->lfp_lvds_vbt_mode
723 * resuse this when needed
724 */
725
726 /* Parse #52 for panel index used from panel_type already
727 * parsed
728 */
729 start = find_section(bdb, BDB_MIPI_CONFIG);
730 if (!start) {
731 DRM_DEBUG_KMS("No MIPI config BDB found");
732 return;
733 }
734
735 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
736 panel_type);
737
738 /*
739 * get hold of the correct configuration block and pps data as per
740 * the panel_type as index
741 */
742 config = &start->config[panel_type];
743 pps = &start->pps[panel_type];
744
745 /* store as of now full data. Trim when we realise all is not needed */
746 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
747 if (!dev_priv->vbt.dsi.config)
748 return;
749
750 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
751 if (!dev_priv->vbt.dsi.pps) {
752 kfree(dev_priv->vbt.dsi.config);
753 return;
754 }
755
756 /* We have mandatory mipi config blocks. Initialize as generic panel */
757 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
758 }
759
760 /* Find the sequence block and size for the given panel. */
761 static const u8 *
762 find_panel_sequence_block(const struct bdb_mipi_sequence *sequence,
763 u16 panel_id, u32 *seq_size)
764 {
765 u32 total = get_blocksize(sequence);
766 const u8 *data = &sequence->data[0];
767 u8 current_id;
768 u32 current_size;
769 int header_size = sequence->version >= 3 ? 5 : 3;
770 int index = 0;
771 int i;
772
773 /* skip new block size */
774 if (sequence->version >= 3)
775 data += 4;
776
777 for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) {
778 if (index + header_size > total) {
779 DRM_ERROR("Invalid sequence block (header)\n");
780 return NULL;
781 }
782
783 current_id = *(data + index);
784 if (sequence->version >= 3)
785 current_size = *((const u32 *)(data + index + 1));
786 else
787 current_size = *((const u16 *)(data + index + 1));
788
789 index += header_size;
790
791 if (index + current_size > total) {
792 DRM_ERROR("Invalid sequence block\n");
793 return NULL;
794 }
795
796 if (current_id == panel_id) {
797 *seq_size = current_size;
798 return data + index;
799 }
800
801 index += current_size;
802 }
803
804 DRM_ERROR("Sequence block detected but no valid configuration\n");
805
806 return NULL;
807 }
808
809 static int goto_next_sequence(const u8 *data, int index, int total)
810 {
811 u16 len;
812
813 /* Skip Sequence Byte. */
814 for (index = index + 1; index < total; index += len) {
815 u8 operation_byte = *(data + index);
816 index++;
817
818 switch (operation_byte) {
819 case MIPI_SEQ_ELEM_END:
820 return index;
821 case MIPI_SEQ_ELEM_SEND_PKT:
822 if (index + 4 > total)
823 return 0;
824
825 len = *((const u16 *)(data + index + 2)) + 4;
826 break;
827 case MIPI_SEQ_ELEM_DELAY:
828 len = 4;
829 break;
830 case MIPI_SEQ_ELEM_GPIO:
831 len = 2;
832 break;
833 case MIPI_SEQ_ELEM_I2C:
834 if (index + 7 > total)
835 return 0;
836 len = *(data + index + 6) + 7;
837 break;
838 default:
839 DRM_ERROR("Unknown operation byte\n");
840 return 0;
841 }
842 }
843
844 return 0;
845 }
846
847 static int goto_next_sequence_v3(const u8 *data, int index, int total)
848 {
849 int seq_end;
850 u16 len;
851 u32 size_of_sequence;
852
853 /*
854 * Could skip sequence based on Size of Sequence alone, but also do some
855 * checking on the structure.
856 */
857 if (total < 5) {
858 DRM_ERROR("Too small sequence size\n");
859 return 0;
860 }
861
862 /* Skip Sequence Byte. */
863 index++;
864
865 /*
866 * Size of Sequence. Excludes the Sequence Byte and the size itself,
867 * includes MIPI_SEQ_ELEM_END byte, excludes the final MIPI_SEQ_END
868 * byte.
869 */
870 size_of_sequence = *((const uint32_t *)(data + index));
871 index += 4;
872
873 seq_end = index + size_of_sequence;
874 if (seq_end > total) {
875 DRM_ERROR("Invalid sequence size\n");
876 return 0;
877 }
878
879 for (; index < total; index += len) {
880 u8 operation_byte = *(data + index);
881 index++;
882
883 if (operation_byte == MIPI_SEQ_ELEM_END) {
884 if (index != seq_end) {
885 DRM_ERROR("Invalid element structure\n");
886 return 0;
887 }
888 return index;
889 }
890
891 len = *(data + index);
892 index++;
893
894 /*
895 * FIXME: Would be nice to check elements like for v1/v2 in
896 * goto_next_sequence() above.
897 */
898 switch (operation_byte) {
899 case MIPI_SEQ_ELEM_SEND_PKT:
900 case MIPI_SEQ_ELEM_DELAY:
901 case MIPI_SEQ_ELEM_GPIO:
902 case MIPI_SEQ_ELEM_I2C:
903 case MIPI_SEQ_ELEM_SPI:
904 case MIPI_SEQ_ELEM_PMIC:
905 break;
906 default:
907 DRM_ERROR("Unknown operation byte %u\n",
908 operation_byte);
909 break;
910 }
911 }
912
913 return 0;
914 }
915
916 static void
917 parse_mipi_sequence(struct drm_i915_private *dev_priv,
918 const struct bdb_header *bdb)
919 {
920 int panel_type = dev_priv->vbt.panel_type;
921 const struct bdb_mipi_sequence *sequence;
922 const u8 *seq_data;
923 u32 seq_size;
924 u8 *data;
925 int index = 0;
926
927 /* Only our generic panel driver uses the sequence block. */
928 if (dev_priv->vbt.dsi.panel_id != MIPI_DSI_GENERIC_PANEL_ID)
929 return;
930
931 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
932 if (!sequence) {
933 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
934 return;
935 }
936
937 /* Fail gracefully for forward incompatible sequence block. */
938 if (sequence->version >= 4) {
939 DRM_ERROR("Unable to parse MIPI Sequence Block v%u\n",
940 sequence->version);
941 return;
942 }
943
944 DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence->version);
945
946 seq_data = find_panel_sequence_block(sequence, panel_type, &seq_size);
947 if (!seq_data)
948 return;
949
950 data = kmemdup(seq_data, seq_size, GFP_KERNEL);
951 if (!data)
952 return;
953
954 /* Parse the sequences, store pointers to each sequence. */
955 for (;;) {
956 u8 seq_id = *(data + index);
957 if (seq_id == MIPI_SEQ_END)
958 break;
959
960 if (seq_id >= MIPI_SEQ_MAX) {
961 DRM_ERROR("Unknown sequence %u\n", seq_id);
962 goto err;
963 }
964
965 dev_priv->vbt.dsi.sequence[seq_id] = data + index;
966
967 if (sequence->version >= 3)
968 index = goto_next_sequence_v3(data, index, seq_size);
969 else
970 index = goto_next_sequence(data, index, seq_size);
971 if (!index) {
972 DRM_ERROR("Invalid sequence %u\n", seq_id);
973 goto err;
974 }
975 }
976
977 dev_priv->vbt.dsi.data = data;
978 dev_priv->vbt.dsi.size = seq_size;
979 dev_priv->vbt.dsi.seq_version = sequence->version;
980
981 DRM_DEBUG_DRIVER("MIPI related VBT parsing complete\n");
982 return;
983
984 err:
985 kfree(data);
986 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
987 }
988
989 static u8 translate_iboost(u8 val)
990 {
991 static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
992
993 if (val >= ARRAY_SIZE(mapping)) {
994 DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
995 return 0;
996 }
997 return mapping[val];
998 }
999
1000 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
1001 const struct bdb_header *bdb)
1002 {
1003 union child_device_config *it, *child = NULL;
1004 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
1005 uint8_t hdmi_level_shift;
1006 int i, j;
1007 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
1008 uint8_t aux_channel, ddc_pin;
1009 /* Each DDI port can have more than one value on the "DVO Port" field,
1010 * so look for all the possible values for each port and abort if more
1011 * than one is found. */
1012 int dvo_ports[][3] = {
1013 {DVO_PORT_HDMIA, DVO_PORT_DPA, -1},
1014 {DVO_PORT_HDMIB, DVO_PORT_DPB, -1},
1015 {DVO_PORT_HDMIC, DVO_PORT_DPC, -1},
1016 {DVO_PORT_HDMID, DVO_PORT_DPD, -1},
1017 {DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE},
1018 };
1019
1020 /* Find the child device to use, abort if more than one found. */
1021 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1022 it = dev_priv->vbt.child_dev + i;
1023
1024 for (j = 0; j < 3; j++) {
1025 if (dvo_ports[port][j] == -1)
1026 break;
1027
1028 if (it->common.dvo_port == dvo_ports[port][j]) {
1029 if (child) {
1030 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
1031 port_name(port));
1032 return;
1033 }
1034 child = it;
1035 }
1036 }
1037 }
1038 if (!child)
1039 return;
1040
1041 aux_channel = child->raw[25];
1042 ddc_pin = child->common.ddc_pin;
1043
1044 is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
1045 is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
1046 is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
1047 is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
1048 is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
1049
1050 info->supports_dvi = is_dvi;
1051 info->supports_hdmi = is_hdmi;
1052 info->supports_dp = is_dp;
1053
1054 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
1055 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
1056
1057 if (is_edp && is_dvi)
1058 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
1059 port_name(port));
1060 if (is_crt && port != PORT_E)
1061 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
1062 if (is_crt && (is_dvi || is_dp))
1063 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
1064 port_name(port));
1065 if (is_dvi && (port == PORT_A || port == PORT_E))
1066 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
1067 if (!is_dvi && !is_dp && !is_crt)
1068 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
1069 port_name(port));
1070 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
1071 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
1072
1073 if (is_dvi) {
1074 if (port == PORT_E) {
1075 info->alternate_ddc_pin = ddc_pin;
1076 /* if DDIE share ddc pin with other port, then
1077 * dvi/hdmi couldn't exist on the shared port.
1078 * Otherwise they share the same ddc bin and system
1079 * couldn't communicate with them seperately. */
1080 if (ddc_pin == DDC_PIN_B) {
1081 dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
1082 dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
1083 } else if (ddc_pin == DDC_PIN_C) {
1084 dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
1085 dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
1086 } else if (ddc_pin == DDC_PIN_D) {
1087 dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
1088 dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
1089 }
1090 } else if (ddc_pin == DDC_PIN_B && port != PORT_B)
1091 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
1092 else if (ddc_pin == DDC_PIN_C && port != PORT_C)
1093 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
1094 else if (ddc_pin == DDC_PIN_D && port != PORT_D)
1095 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
1096 }
1097
1098 if (is_dp) {
1099 if (port == PORT_E) {
1100 info->alternate_aux_channel = aux_channel;
1101 /* if DDIE share aux channel with other port, then
1102 * DP couldn't exist on the shared port. Otherwise
1103 * they share the same aux channel and system
1104 * couldn't communicate with them seperately. */
1105 if (aux_channel == DP_AUX_A)
1106 dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0;
1107 else if (aux_channel == DP_AUX_B)
1108 dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0;
1109 else if (aux_channel == DP_AUX_C)
1110 dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0;
1111 else if (aux_channel == DP_AUX_D)
1112 dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0;
1113 }
1114 else if (aux_channel == DP_AUX_A && port != PORT_A)
1115 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
1116 else if (aux_channel == DP_AUX_B && port != PORT_B)
1117 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
1118 else if (aux_channel == DP_AUX_C && port != PORT_C)
1119 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
1120 else if (aux_channel == DP_AUX_D && port != PORT_D)
1121 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
1122 }
1123
1124 if (bdb->version >= 158) {
1125 /* The VBT HDMI level shift values match the table we have. */
1126 hdmi_level_shift = child->raw[7] & 0xF;
1127 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1128 port_name(port),
1129 hdmi_level_shift);
1130 info->hdmi_level_shift = hdmi_level_shift;
1131 }
1132
1133 /* Parse the I_boost config for SKL and above */
1134 if (bdb->version >= 196 && child->common.iboost) {
1135 info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF);
1136 DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
1137 port_name(port), info->dp_boost_level);
1138 info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4);
1139 DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
1140 port_name(port), info->hdmi_boost_level);
1141 }
1142 }
1143
1144 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
1145 const struct bdb_header *bdb)
1146 {
1147 enum port port;
1148
1149 if (!HAS_DDI(dev_priv))
1150 return;
1151
1152 if (!dev_priv->vbt.child_dev_num)
1153 return;
1154
1155 if (bdb->version < 155)
1156 return;
1157
1158 for (port = PORT_A; port < I915_MAX_PORTS; port++)
1159 parse_ddi_port(dev_priv, port, bdb);
1160 }
1161
1162 static void
1163 parse_device_mapping(struct drm_i915_private *dev_priv,
1164 const struct bdb_header *bdb)
1165 {
1166 const struct bdb_general_definitions *p_defs;
1167 const union child_device_config *p_child;
1168 union child_device_config *child_dev_ptr;
1169 int i, child_device_num, count;
1170 u8 expected_size;
1171 u16 block_size;
1172
1173 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1174 if (!p_defs) {
1175 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1176 return;
1177 }
1178 if (bdb->version < 106) {
1179 expected_size = 22;
1180 } else if (bdb->version < 109) {
1181 expected_size = 27;
1182 } else if (bdb->version < 195) {
1183 BUILD_BUG_ON(sizeof(struct old_child_dev_config) != 33);
1184 expected_size = sizeof(struct old_child_dev_config);
1185 } else if (bdb->version == 195) {
1186 expected_size = 37;
1187 } else if (bdb->version <= 197) {
1188 expected_size = 38;
1189 } else {
1190 expected_size = 38;
1191 BUILD_BUG_ON(sizeof(*p_child) < 38);
1192 DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
1193 bdb->version, expected_size);
1194 }
1195
1196 /* Flag an error for unexpected size, but continue anyway. */
1197 if (p_defs->child_dev_size != expected_size)
1198 DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n",
1199 p_defs->child_dev_size, expected_size, bdb->version);
1200
1201 /* The legacy sized child device config is the minimum we need. */
1202 if (p_defs->child_dev_size < sizeof(struct old_child_dev_config)) {
1203 DRM_DEBUG_KMS("Child device config size %u is too small.\n",
1204 p_defs->child_dev_size);
1205 return;
1206 }
1207
1208 /* get the block size of general definitions */
1209 block_size = get_blocksize(p_defs);
1210 /* get the number of child device */
1211 child_device_num = (block_size - sizeof(*p_defs)) /
1212 p_defs->child_dev_size;
1213 count = 0;
1214 /* get the number of child device that is present */
1215 for (i = 0; i < child_device_num; i++) {
1216 p_child = child_device_ptr(p_defs, i);
1217 if (!p_child->common.device_type) {
1218 /* skip the device block if device type is invalid */
1219 continue;
1220 }
1221 count++;
1222 }
1223 if (!count) {
1224 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1225 return;
1226 }
1227 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
1228 if (!dev_priv->vbt.child_dev) {
1229 DRM_DEBUG_KMS("No memory space for child device\n");
1230 return;
1231 }
1232
1233 dev_priv->vbt.child_dev_num = count;
1234 count = 0;
1235 for (i = 0; i < child_device_num; i++) {
1236 p_child = child_device_ptr(p_defs, i);
1237 if (!p_child->common.device_type) {
1238 /* skip the device block if device type is invalid */
1239 continue;
1240 }
1241
1242 child_dev_ptr = dev_priv->vbt.child_dev + count;
1243 count++;
1244
1245 /*
1246 * Copy as much as we know (sizeof) and is available
1247 * (child_dev_size) of the child device. Accessing the data must
1248 * depend on VBT version.
1249 */
1250 memcpy(child_dev_ptr, p_child,
1251 min_t(size_t, p_defs->child_dev_size, sizeof(*p_child)));
1252
1253 /*
1254 * copied full block, now init values when they are not
1255 * available in current version
1256 */
1257 if (bdb->version < 196) {
1258 /* Set default values for bits added from v196 */
1259 child_dev_ptr->common.iboost = 0;
1260 child_dev_ptr->common.hpd_invert = 0;
1261 }
1262
1263 if (bdb->version < 192)
1264 child_dev_ptr->common.lspcon = 0;
1265 }
1266 return;
1267 }
1268
1269 static void
1270 init_vbt_defaults(struct drm_i915_private *dev_priv)
1271 {
1272 enum port port;
1273
1274 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
1275
1276 /* Default to having backlight */
1277 dev_priv->vbt.backlight.present = true;
1278
1279 /* LFP panel data */
1280 dev_priv->vbt.lvds_dither = 1;
1281 dev_priv->vbt.lvds_vbt = 0;
1282
1283 /* SDVO panel data */
1284 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1285
1286 /* general features */
1287 dev_priv->vbt.int_tv_support = 1;
1288 dev_priv->vbt.int_crt_support = 1;
1289
1290 /* Default to using SSC */
1291 dev_priv->vbt.lvds_use_ssc = 1;
1292 /*
1293 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1294 * clock for LVDS.
1295 */
1296 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev_priv,
1297 !HAS_PCH_SPLIT(dev_priv));
1298 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1299
1300 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1301 struct ddi_vbt_port_info *info =
1302 &dev_priv->vbt.ddi_port_info[port];
1303
1304 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1305
1306 info->supports_dvi = (port != PORT_A && port != PORT_E);
1307 info->supports_hdmi = info->supports_dvi;
1308 info->supports_dp = (port != PORT_E);
1309 }
1310 }
1311
1312 static const struct bdb_header *get_bdb_header(const struct vbt_header *vbt)
1313 {
1314 const void *_vbt = vbt;
1315
1316 return _vbt + vbt->bdb_offset;
1317 }
1318
1319 /**
1320 * intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
1321 * @buf: pointer to a buffer to validate
1322 * @size: size of the buffer
1323 *
1324 * Returns true on valid VBT.
1325 */
1326 bool intel_bios_is_valid_vbt(const void *buf, size_t size)
1327 {
1328 const struct vbt_header *vbt = buf;
1329 const struct bdb_header *bdb;
1330
1331 if (!vbt)
1332 return false;
1333
1334 if (sizeof(struct vbt_header) > size) {
1335 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1336 return false;
1337 }
1338
1339 if (memcmp(vbt->signature, "$VBT", 4)) {
1340 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1341 return false;
1342 }
1343
1344 if (vbt->bdb_offset + sizeof(struct bdb_header) > size) {
1345 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1346 return false;
1347 }
1348
1349 bdb = get_bdb_header(vbt);
1350 if (vbt->bdb_offset + bdb->bdb_size > size) {
1351 DRM_DEBUG_DRIVER("BDB incomplete\n");
1352 return false;
1353 }
1354
1355 return vbt;
1356 }
1357
1358 static const struct vbt_header *find_vbt(void __iomem *bios, size_t size)
1359 {
1360 size_t i;
1361
1362 /* Scour memory looking for the VBT signature. */
1363 for (i = 0; i + 4 < size; i++) {
1364 void *vbt;
1365
1366 if (ioread32(bios + i) != *((const u32 *) "$VBT"))
1367 continue;
1368
1369 /*
1370 * This is the one place where we explicitly discard the address
1371 * space (__iomem) of the BIOS/VBT.
1372 */
1373 vbt = (void __force *) bios + i;
1374 if (intel_bios_is_valid_vbt(vbt, size - i))
1375 return vbt;
1376
1377 break;
1378 }
1379
1380 return NULL;
1381 }
1382
1383 /**
1384 * intel_bios_init - find VBT and initialize settings from the BIOS
1385 * @dev_priv: i915 device instance
1386 *
1387 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1388 * to appropriate values.
1389 *
1390 * Returns 0 on success, nonzero on failure.
1391 */
1392 int
1393 intel_bios_init(struct drm_i915_private *dev_priv)
1394 {
1395 struct pci_dev *pdev = dev_priv->dev->pdev;
1396 const struct vbt_header *vbt = dev_priv->opregion.vbt;
1397 const struct bdb_header *bdb;
1398 u8 __iomem *bios = NULL;
1399
1400 if (HAS_PCH_NOP(dev_priv))
1401 return -ENODEV;
1402
1403 init_vbt_defaults(dev_priv);
1404
1405 if (!vbt) {
1406 size_t size;
1407
1408 bios = pci_map_rom(pdev, &size);
1409 if (!bios)
1410 return -1;
1411
1412 vbt = find_vbt(bios, size);
1413 if (!vbt) {
1414 pci_unmap_rom(pdev, bios);
1415 return -1;
1416 }
1417
1418 DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
1419 }
1420
1421 bdb = get_bdb_header(vbt);
1422
1423 DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
1424 (int)sizeof(vbt->signature), vbt->signature, bdb->version);
1425
1426 /* Grab useful general definitions */
1427 parse_general_features(dev_priv, bdb);
1428 parse_general_definitions(dev_priv, bdb);
1429 parse_lfp_panel_data(dev_priv, bdb);
1430 parse_lfp_backlight(dev_priv, bdb);
1431 parse_sdvo_panel_data(dev_priv, bdb);
1432 parse_sdvo_device_mapping(dev_priv, bdb);
1433 parse_device_mapping(dev_priv, bdb);
1434 parse_driver_features(dev_priv, bdb);
1435 parse_edp(dev_priv, bdb);
1436 parse_psr(dev_priv, bdb);
1437 parse_mipi_config(dev_priv, bdb);
1438 parse_mipi_sequence(dev_priv, bdb);
1439 parse_ddi_ports(dev_priv, bdb);
1440
1441 if (bios)
1442 pci_unmap_rom(pdev, bios);
1443
1444 return 0;
1445 }
1446
1447 /**
1448 * intel_bios_is_tv_present - is integrated TV present in VBT
1449 * @dev_priv: i915 device instance
1450 *
1451 * Return true if TV is present. If no child devices were parsed from VBT,
1452 * assume TV is present.
1453 */
1454 bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv)
1455 {
1456 union child_device_config *p_child;
1457 int i;
1458
1459 if (!dev_priv->vbt.int_tv_support)
1460 return false;
1461
1462 if (!dev_priv->vbt.child_dev_num)
1463 return true;
1464
1465 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1466 p_child = dev_priv->vbt.child_dev + i;
1467 /*
1468 * If the device type is not TV, continue.
1469 */
1470 switch (p_child->old.device_type) {
1471 case DEVICE_TYPE_INT_TV:
1472 case DEVICE_TYPE_TV:
1473 case DEVICE_TYPE_TV_SVIDEO_COMPOSITE:
1474 break;
1475 default:
1476 continue;
1477 }
1478 /* Only when the addin_offset is non-zero, it is regarded
1479 * as present.
1480 */
1481 if (p_child->old.addin_offset)
1482 return true;
1483 }
1484
1485 return false;
1486 }
1487
1488 /**
1489 * intel_bios_is_lvds_present - is LVDS present in VBT
1490 * @dev_priv: i915 device instance
1491 * @i2c_pin: i2c pin for LVDS if present
1492 *
1493 * Return true if LVDS is present. If no child devices were parsed from VBT,
1494 * assume LVDS is present.
1495 */
1496 bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin)
1497 {
1498 int i;
1499
1500 if (!dev_priv->vbt.child_dev_num)
1501 return true;
1502
1503 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1504 union child_device_config *uchild = dev_priv->vbt.child_dev + i;
1505 struct old_child_dev_config *child = &uchild->old;
1506
1507 /* If the device type is not LFP, continue.
1508 * We have to check both the new identifiers as well as the
1509 * old for compatibility with some BIOSes.
1510 */
1511 if (child->device_type != DEVICE_TYPE_INT_LFP &&
1512 child->device_type != DEVICE_TYPE_LFP)
1513 continue;
1514
1515 if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
1516 *i2c_pin = child->i2c_pin;
1517
1518 /* However, we cannot trust the BIOS writers to populate
1519 * the VBT correctly. Since LVDS requires additional
1520 * information from AIM blocks, a non-zero addin offset is
1521 * a good indicator that the LVDS is actually present.
1522 */
1523 if (child->addin_offset)
1524 return true;
1525
1526 /* But even then some BIOS writers perform some black magic
1527 * and instantiate the device without reference to any
1528 * additional data. Trust that if the VBT was written into
1529 * the OpRegion then they have validated the LVDS's existence.
1530 */
1531 if (dev_priv->opregion.vbt)
1532 return true;
1533 }
1534
1535 return false;
1536 }
1537
1538 /**
1539 * intel_bios_is_port_edp - is the device in given port eDP
1540 * @dev_priv: i915 device instance
1541 * @port: port to check
1542 *
1543 * Return true if the device in %port is eDP.
1544 */
1545 bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
1546 {
1547 union child_device_config *p_child;
1548 static const short port_mapping[] = {
1549 [PORT_B] = DVO_PORT_DPB,
1550 [PORT_C] = DVO_PORT_DPC,
1551 [PORT_D] = DVO_PORT_DPD,
1552 [PORT_E] = DVO_PORT_DPE,
1553 };
1554 int i;
1555
1556 if (!dev_priv->vbt.child_dev_num)
1557 return false;
1558
1559 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1560 p_child = dev_priv->vbt.child_dev + i;
1561
1562 if (p_child->common.dvo_port == port_mapping[port] &&
1563 (p_child->common.device_type & DEVICE_TYPE_eDP_BITS) ==
1564 (DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS))
1565 return true;
1566 }
1567
1568 return false;
1569 }
1570
1571 /**
1572 * intel_bios_is_dsi_present - is DSI present in VBT
1573 * @dev_priv: i915 device instance
1574 * @port: port for DSI if present
1575 *
1576 * Return true if DSI is present, and return the port in %port.
1577 */
1578 bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
1579 enum port *port)
1580 {
1581 union child_device_config *p_child;
1582 u8 dvo_port;
1583 int i;
1584
1585 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1586 p_child = dev_priv->vbt.child_dev + i;
1587
1588 if (!(p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT))
1589 continue;
1590
1591 dvo_port = p_child->common.dvo_port;
1592
1593 switch (dvo_port) {
1594 case DVO_PORT_MIPIA:
1595 case DVO_PORT_MIPIC:
1596 if (port)
1597 *port = dvo_port - DVO_PORT_MIPIA;
1598 return true;
1599 case DVO_PORT_MIPIB:
1600 case DVO_PORT_MIPID:
1601 DRM_DEBUG_KMS("VBT has unsupported DSI port %c\n",
1602 port_name(dvo_port - DVO_PORT_MIPIA));
1603 break;
1604 }
1605 }
1606
1607 return false;
1608 }
1609
1610 /**
1611 * intel_bios_is_port_hpd_inverted - is HPD inverted for %port
1612 * @dev_priv: i915 device instance
1613 * @port: port to check
1614 *
1615 * Return true if HPD should be inverted for %port.
1616 */
1617 bool
1618 intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
1619 enum port port)
1620 {
1621 int i;
1622
1623 if (WARN_ON_ONCE(!IS_BROXTON(dev_priv)))
1624 return false;
1625
1626 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1627 if (!dev_priv->vbt.child_dev[i].common.hpd_invert)
1628 continue;
1629
1630 switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
1631 case DVO_PORT_DPA:
1632 case DVO_PORT_HDMIA:
1633 if (port == PORT_A)
1634 return true;
1635 break;
1636 case DVO_PORT_DPB:
1637 case DVO_PORT_HDMIB:
1638 if (port == PORT_B)
1639 return true;
1640 break;
1641 case DVO_PORT_DPC:
1642 case DVO_PORT_HDMIC:
1643 if (port == PORT_C)
1644 return true;
1645 break;
1646 default:
1647 break;
1648 }
1649 }
1650
1651 return false;
1652 }
Linux kernel - Deliverables
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