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xtensa: fix high memory/reserved memory collision
[cris-mirror.git] / drivers / gpu / drm / i915 / intel_bios.c
blobf7f771749e4809dcedbea023bea54e4be4ac1537
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_hi << 8) |
118 dvo_timing->hsync_pulse_width_lo);
119 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
120 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
121
122 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
123 dvo_timing->vactive_lo;
124 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
125 ((dvo_timing->vsync_off_hi << 4) | dvo_timing->vsync_off_lo);
126 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
127 ((dvo_timing->vsync_pulse_width_hi << 4) |
128 dvo_timing->vsync_pulse_width_lo);
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 panel_fixed_mode->width_mm = (dvo_timing->himage_hi << 8) |
145 dvo_timing->himage_lo;
146 panel_fixed_mode->height_mm = (dvo_timing->vimage_hi << 8) |
147 dvo_timing->vimage_lo;
148
149 /* Some VBTs have bogus h/vtotal values */
150 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
151 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
152 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
153 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
154
155 drm_mode_set_name(panel_fixed_mode);
156 }
157
158 static const struct lvds_dvo_timing *
159 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
160 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
161 int index)
162 {
163 /*
164 * the size of fp_timing varies on the different platform.
165 * So calculate the DVO timing relative offset in LVDS data
166 * entry to get the DVO timing entry
167 */
168
169 int lfp_data_size =
170 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
171 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
172 int dvo_timing_offset =
173 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
174 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
175 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
176
177 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
178 }
179
180 /* get lvds_fp_timing entry
181 * this function may return NULL if the corresponding entry is invalid
182 */
183 static const struct lvds_fp_timing *
184 get_lvds_fp_timing(const struct bdb_header *bdb,
185 const struct bdb_lvds_lfp_data *data,
186 const struct bdb_lvds_lfp_data_ptrs *ptrs,
187 int index)
188 {
189 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
190 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
191 size_t ofs;
192
193 if (index >= ARRAY_SIZE(ptrs->ptr))
194 return NULL;
195 ofs = ptrs->ptr[index].fp_timing_offset;
196 if (ofs < data_ofs ||
197 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
198 return NULL;
199 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
200 }
201
202 /* Try to find integrated panel data */
203 static void
204 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
205 const struct bdb_header *bdb)
206 {
207 const struct bdb_lvds_options *lvds_options;
208 const struct bdb_lvds_lfp_data *lvds_lfp_data;
209 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
210 const struct lvds_dvo_timing *panel_dvo_timing;
211 const struct lvds_fp_timing *fp_timing;
212 struct drm_display_mode *panel_fixed_mode;
213 int panel_type;
214 int drrs_mode;
215 int ret;
216
217 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
218 if (!lvds_options)
219 return;
220
221 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
222
223 ret = intel_opregion_get_panel_type(dev_priv);
224 if (ret >= 0) {
225 WARN_ON(ret > 0xf);
226 panel_type = ret;
227 DRM_DEBUG_KMS("Panel type: %d (OpRegion)\n", panel_type);
228 } else {
229 if (lvds_options->panel_type > 0xf) {
230 DRM_DEBUG_KMS("Invalid VBT panel type 0x%x\n",
231 lvds_options->panel_type);
232 return;
233 }
234 panel_type = lvds_options->panel_type;
235 DRM_DEBUG_KMS("Panel type: %d (VBT)\n", panel_type);
236 }
237
238 dev_priv->vbt.panel_type = panel_type;
239
240 drrs_mode = (lvds_options->dps_panel_type_bits
241 >> (panel_type * 2)) & MODE_MASK;
242 /*
243 * VBT has static DRRS = 0 and seamless DRRS = 2.
244 * The below piece of code is required to adjust vbt.drrs_type
245 * to match the enum drrs_support_type.
246 */
247 switch (drrs_mode) {
248 case 0:
249 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
250 DRM_DEBUG_KMS("DRRS supported mode is static\n");
251 break;
252 case 2:
253 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
254 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
255 break;
256 default:
257 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
258 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
259 break;
260 }
261
262 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
263 if (!lvds_lfp_data)
264 return;
265
266 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
267 if (!lvds_lfp_data_ptrs)
268 return;
269
270 dev_priv->vbt.lvds_vbt = 1;
271
272 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
273 lvds_lfp_data_ptrs,
274 panel_type);
275
276 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
277 if (!panel_fixed_mode)
278 return;
279
280 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
281
282 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
283
284 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
285 drm_mode_debug_printmodeline(panel_fixed_mode);
286
287 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
288 lvds_lfp_data_ptrs,
289 panel_type);
290 if (fp_timing) {
291 /* check the resolution, just to be sure */
292 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
293 fp_timing->y_res == panel_fixed_mode->vdisplay) {
294 dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
295 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
296 dev_priv->vbt.bios_lvds_val);
297 }
298 }
299 }
300
301 static void
302 parse_lfp_backlight(struct drm_i915_private *dev_priv,
303 const struct bdb_header *bdb)
304 {
305 const struct bdb_lfp_backlight_data *backlight_data;
306 const struct bdb_lfp_backlight_data_entry *entry;
307 int panel_type = dev_priv->vbt.panel_type;
308
309 backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
310 if (!backlight_data)
311 return;
312
313 if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
314 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
315 backlight_data->entry_size);
316 return;
317 }
318
319 entry = &backlight_data->data[panel_type];
320
321 dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
322 if (!dev_priv->vbt.backlight.present) {
323 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
324 entry->type);
325 return;
326 }
327
328 dev_priv->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI;
329 if (bdb->version >= 191 &&
330 get_blocksize(backlight_data) >= sizeof(*backlight_data)) {
331 const struct bdb_lfp_backlight_control_method *method;
332
333 method = &backlight_data->backlight_control[panel_type];
334 dev_priv->vbt.backlight.type = method->type;
335 dev_priv->vbt.backlight.controller = method->controller;
336 }
337
338 dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
339 dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
340 dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
341 DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
342 "active %s, min brightness %u, level %u, controller %u\n",
343 dev_priv->vbt.backlight.pwm_freq_hz,
344 dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
345 dev_priv->vbt.backlight.min_brightness,
346 backlight_data->level[panel_type],
347 dev_priv->vbt.backlight.controller);
348 }
349
350 /* Try to find sdvo panel data */
351 static void
352 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
353 const struct bdb_header *bdb)
354 {
355 const struct lvds_dvo_timing *dvo_timing;
356 struct drm_display_mode *panel_fixed_mode;
357 int index;
358
359 index = i915_modparams.vbt_sdvo_panel_type;
360 if (index == -2) {
361 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
362 return;
363 }
364
365 if (index == -1) {
366 const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
367
368 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
369 if (!sdvo_lvds_options)
370 return;
371
372 index = sdvo_lvds_options->panel_type;
373 }
374
375 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
376 if (!dvo_timing)
377 return;
378
379 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
380 if (!panel_fixed_mode)
381 return;
382
383 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
384
385 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
386
387 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
388 drm_mode_debug_printmodeline(panel_fixed_mode);
389 }
390
391 static int intel_bios_ssc_frequency(struct drm_i915_private *dev_priv,
392 bool alternate)
393 {
394 switch (INTEL_INFO(dev_priv)->gen) {
395 case 2:
396 return alternate ? 66667 : 48000;
397 case 3:
398 case 4:
399 return alternate ? 100000 : 96000;
400 default:
401 return alternate ? 100000 : 120000;
402 }
403 }
404
405 static void
406 parse_general_features(struct drm_i915_private *dev_priv,
407 const struct bdb_header *bdb)
408 {
409 const struct bdb_general_features *general;
410
411 general = find_section(bdb, BDB_GENERAL_FEATURES);
412 if (!general)
413 return;
414
415 dev_priv->vbt.int_tv_support = general->int_tv_support;
416 /* int_crt_support can't be trusted on earlier platforms */
417 if (bdb->version >= 155 &&
418 (HAS_DDI(dev_priv) || IS_VALLEYVIEW(dev_priv)))
419 dev_priv->vbt.int_crt_support = general->int_crt_support;
420 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
421 dev_priv->vbt.lvds_ssc_freq =
422 intel_bios_ssc_frequency(dev_priv, general->ssc_freq);
423 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
424 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
425 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",
426 dev_priv->vbt.int_tv_support,
427 dev_priv->vbt.int_crt_support,
428 dev_priv->vbt.lvds_use_ssc,
429 dev_priv->vbt.lvds_ssc_freq,
430 dev_priv->vbt.display_clock_mode,
431 dev_priv->vbt.fdi_rx_polarity_inverted);
432 }
433
434 static const struct child_device_config *
435 child_device_ptr(const struct bdb_general_definitions *defs, int i)
436 {
437 return (const void *) &defs->devices[i * defs->child_dev_size];
438 }
439
440 static void
441 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, u8 bdb_version)
442 {
443 struct sdvo_device_mapping *mapping;
444 const struct child_device_config *child;
445 int i, count = 0;
446
447 /*
448 * Only parse SDVO mappings on gens that could have SDVO. This isn't
449 * accurate and doesn't have to be, as long as it's not too strict.
450 */
451 if (!IS_GEN(dev_priv, 3, 7)) {
452 DRM_DEBUG_KMS("Skipping SDVO device mapping\n");
453 return;
454 }
455
456 for (i = 0, count = 0; i < dev_priv->vbt.child_dev_num; i++) {
457 child = dev_priv->vbt.child_dev + i;
458
459 if (child->slave_addr != SLAVE_ADDR1 &&
460 child->slave_addr != SLAVE_ADDR2) {
461 /*
462 * If the slave address is neither 0x70 nor 0x72,
463 * it is not a SDVO device. Skip it.
464 */
465 continue;
466 }
467 if (child->dvo_port != DEVICE_PORT_DVOB &&
468 child->dvo_port != DEVICE_PORT_DVOC) {
469 /* skip the incorrect SDVO port */
470 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
471 continue;
472 }
473 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
474 " %s port\n",
475 child->slave_addr,
476 (child->dvo_port == DEVICE_PORT_DVOB) ?
477 "SDVOB" : "SDVOC");
478 mapping = &dev_priv->vbt.sdvo_mappings[child->dvo_port - 1];
479 if (!mapping->initialized) {
480 mapping->dvo_port = child->dvo_port;
481 mapping->slave_addr = child->slave_addr;
482 mapping->dvo_wiring = child->dvo_wiring;
483 mapping->ddc_pin = child->ddc_pin;
484 mapping->i2c_pin = child->i2c_pin;
485 mapping->initialized = 1;
486 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
487 mapping->dvo_port,
488 mapping->slave_addr,
489 mapping->dvo_wiring,
490 mapping->ddc_pin,
491 mapping->i2c_pin);
492 } else {
493 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
494 "two SDVO device.\n");
495 }
496 if (child->slave2_addr) {
497 /* Maybe this is a SDVO device with multiple inputs */
498 /* And the mapping info is not added */
499 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
500 " is a SDVO device with multiple inputs.\n");
501 }
502 count++;
503 }
504
505 if (!count) {
506 /* No SDVO device info is found */
507 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
508 }
509 }
510
511 static void
512 parse_driver_features(struct drm_i915_private *dev_priv,
513 const struct bdb_header *bdb)
514 {
515 const struct bdb_driver_features *driver;
516
517 driver = find_section(bdb, BDB_DRIVER_FEATURES);
518 if (!driver)
519 return;
520
521 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
522 dev_priv->vbt.edp.support = 1;
523
524 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
525 /*
526 * If DRRS is not supported, drrs_type has to be set to 0.
527 * This is because, VBT is configured in such a way that
528 * static DRRS is 0 and DRRS not supported is represented by
529 * driver->drrs_enabled=false
530 */
531 if (!driver->drrs_enabled)
532 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
533 }
534
535 static void
536 parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
537 {
538 const struct bdb_edp *edp;
539 const struct edp_power_seq *edp_pps;
540 const struct edp_fast_link_params *edp_link_params;
541 int panel_type = dev_priv->vbt.panel_type;
542
543 edp = find_section(bdb, BDB_EDP);
544 if (!edp) {
545 if (dev_priv->vbt.edp.support)
546 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
547 return;
548 }
549
550 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
551 case EDP_18BPP:
552 dev_priv->vbt.edp.bpp = 18;
553 break;
554 case EDP_24BPP:
555 dev_priv->vbt.edp.bpp = 24;
556 break;
557 case EDP_30BPP:
558 dev_priv->vbt.edp.bpp = 30;
559 break;
560 }
561
562 /* Get the eDP sequencing and link info */
563 edp_pps = &edp->power_seqs[panel_type];
564 edp_link_params = &edp->fast_link_params[panel_type];
565
566 dev_priv->vbt.edp.pps = *edp_pps;
567
568 switch (edp_link_params->rate) {
569 case EDP_RATE_1_62:
570 dev_priv->vbt.edp.rate = DP_LINK_BW_1_62;
571 break;
572 case EDP_RATE_2_7:
573 dev_priv->vbt.edp.rate = DP_LINK_BW_2_7;
574 break;
575 default:
576 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
577 edp_link_params->rate);
578 break;
579 }
580
581 switch (edp_link_params->lanes) {
582 case EDP_LANE_1:
583 dev_priv->vbt.edp.lanes = 1;
584 break;
585 case EDP_LANE_2:
586 dev_priv->vbt.edp.lanes = 2;
587 break;
588 case EDP_LANE_4:
589 dev_priv->vbt.edp.lanes = 4;
590 break;
591 default:
592 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
593 edp_link_params->lanes);
594 break;
595 }
596
597 switch (edp_link_params->preemphasis) {
598 case EDP_PREEMPHASIS_NONE:
599 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
600 break;
601 case EDP_PREEMPHASIS_3_5dB:
602 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
603 break;
604 case EDP_PREEMPHASIS_6dB:
605 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
606 break;
607 case EDP_PREEMPHASIS_9_5dB:
608 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
609 break;
610 default:
611 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
612 edp_link_params->preemphasis);
613 break;
614 }
615
616 switch (edp_link_params->vswing) {
617 case EDP_VSWING_0_4V:
618 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
619 break;
620 case EDP_VSWING_0_6V:
621 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
622 break;
623 case EDP_VSWING_0_8V:
624 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
625 break;
626 case EDP_VSWING_1_2V:
627 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
628 break;
629 default:
630 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
631 edp_link_params->vswing);
632 break;
633 }
634
635 if (bdb->version >= 173) {
636 uint8_t vswing;
637
638 /* Don't read from VBT if module parameter has valid value*/
639 if (i915_modparams.edp_vswing) {
640 dev_priv->vbt.edp.low_vswing =
641 i915_modparams.edp_vswing == 1;
642 } else {
643 vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
644 dev_priv->vbt.edp.low_vswing = vswing == 0;
645 }
646 }
647 }
648
649 static void
650 parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
651 {
652 const struct bdb_psr *psr;
653 const struct psr_table *psr_table;
654 int panel_type = dev_priv->vbt.panel_type;
655
656 psr = find_section(bdb, BDB_PSR);
657 if (!psr) {
658 DRM_DEBUG_KMS("No PSR BDB found.\n");
659 return;
660 }
661
662 psr_table = &psr->psr_table[panel_type];
663
664 dev_priv->vbt.psr.full_link = psr_table->full_link;
665 dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
666
667 /* Allowed VBT values goes from 0 to 15 */
668 dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
669 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
670
671 switch (psr_table->lines_to_wait) {
672 case 0:
673 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
674 break;
675 case 1:
676 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
677 break;
678 case 2:
679 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
680 break;
681 case 3:
682 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
683 break;
684 default:
685 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
686 psr_table->lines_to_wait);
687 break;
688 }
689
690 dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
691 dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
692 }
693
694 static void parse_dsi_backlight_ports(struct drm_i915_private *dev_priv,
695 u16 version, enum port port)
696 {
697 if (!dev_priv->vbt.dsi.config->dual_link || version < 197) {
698 dev_priv->vbt.dsi.bl_ports = BIT(port);
699 if (dev_priv->vbt.dsi.config->cabc_supported)
700 dev_priv->vbt.dsi.cabc_ports = BIT(port);
701
702 return;
703 }
704
705 switch (dev_priv->vbt.dsi.config->dl_dcs_backlight_ports) {
706 case DL_DCS_PORT_A:
707 dev_priv->vbt.dsi.bl_ports = BIT(PORT_A);
708 break;
709 case DL_DCS_PORT_C:
710 dev_priv->vbt.dsi.bl_ports = BIT(PORT_C);
711 break;
712 default:
713 case DL_DCS_PORT_A_AND_C:
714 dev_priv->vbt.dsi.bl_ports = BIT(PORT_A) | BIT(PORT_C);
715 break;
716 }
717
718 if (!dev_priv->vbt.dsi.config->cabc_supported)
719 return;
720
721 switch (dev_priv->vbt.dsi.config->dl_dcs_cabc_ports) {
722 case DL_DCS_PORT_A:
723 dev_priv->vbt.dsi.cabc_ports = BIT(PORT_A);
724 break;
725 case DL_DCS_PORT_C:
726 dev_priv->vbt.dsi.cabc_ports = BIT(PORT_C);
727 break;
728 default:
729 case DL_DCS_PORT_A_AND_C:
730 dev_priv->vbt.dsi.cabc_ports =
731 BIT(PORT_A) | BIT(PORT_C);
732 break;
733 }
734 }
735
736 static void
737 parse_mipi_config(struct drm_i915_private *dev_priv,
738 const struct bdb_header *bdb)
739 {
740 const struct bdb_mipi_config *start;
741 const struct mipi_config *config;
742 const struct mipi_pps_data *pps;
743 int panel_type = dev_priv->vbt.panel_type;
744 enum port port;
745
746 /* parse MIPI blocks only if LFP type is MIPI */
747 if (!intel_bios_is_dsi_present(dev_priv, &port))
748 return;
749
750 /* Initialize this to undefined indicating no generic MIPI support */
751 dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
752
753 /* Block #40 is already parsed and panel_fixed_mode is
754 * stored in dev_priv->lfp_lvds_vbt_mode
755 * resuse this when needed
756 */
757
758 /* Parse #52 for panel index used from panel_type already
759 * parsed
760 */
761 start = find_section(bdb, BDB_MIPI_CONFIG);
762 if (!start) {
763 DRM_DEBUG_KMS("No MIPI config BDB found");
764 return;
765 }
766
767 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
768 panel_type);
769
770 /*
771 * get hold of the correct configuration block and pps data as per
772 * the panel_type as index
773 */
774 config = &start->config[panel_type];
775 pps = &start->pps[panel_type];
776
777 /* store as of now full data. Trim when we realise all is not needed */
778 dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
779 if (!dev_priv->vbt.dsi.config)
780 return;
781
782 dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
783 if (!dev_priv->vbt.dsi.pps) {
784 kfree(dev_priv->vbt.dsi.config);
785 return;
786 }
787
788 parse_dsi_backlight_ports(dev_priv, bdb->version, port);
789
790 /* We have mandatory mipi config blocks. Initialize as generic panel */
791 dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
792 }
793
794 /* Find the sequence block and size for the given panel. */
795 static const u8 *
796 find_panel_sequence_block(const struct bdb_mipi_sequence *sequence,
797 u16 panel_id, u32 *seq_size)
798 {
799 u32 total = get_blocksize(sequence);
800 const u8 *data = &sequence->data[0];
801 u8 current_id;
802 u32 current_size;
803 int header_size = sequence->version >= 3 ? 5 : 3;
804 int index = 0;
805 int i;
806
807 /* skip new block size */
808 if (sequence->version >= 3)
809 data += 4;
810
811 for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) {
812 if (index + header_size > total) {
813 DRM_ERROR("Invalid sequence block (header)\n");
814 return NULL;
815 }
816
817 current_id = *(data + index);
818 if (sequence->version >= 3)
819 current_size = *((const u32 *)(data + index + 1));
820 else
821 current_size = *((const u16 *)(data + index + 1));
822
823 index += header_size;
824
825 if (index + current_size > total) {
826 DRM_ERROR("Invalid sequence block\n");
827 return NULL;
828 }
829
830 if (current_id == panel_id) {
831 *seq_size = current_size;
832 return data + index;
833 }
834
835 index += current_size;
836 }
837
838 DRM_ERROR("Sequence block detected but no valid configuration\n");
839
840 return NULL;
841 }
842
843 static int goto_next_sequence(const u8 *data, int index, int total)
844 {
845 u16 len;
846
847 /* Skip Sequence Byte. */
848 for (index = index + 1; index < total; index += len) {
849 u8 operation_byte = *(data + index);
850 index++;
851
852 switch (operation_byte) {
853 case MIPI_SEQ_ELEM_END:
854 return index;
855 case MIPI_SEQ_ELEM_SEND_PKT:
856 if (index + 4 > total)
857 return 0;
858
859 len = *((const u16 *)(data + index + 2)) + 4;
860 break;
861 case MIPI_SEQ_ELEM_DELAY:
862 len = 4;
863 break;
864 case MIPI_SEQ_ELEM_GPIO:
865 len = 2;
866 break;
867 case MIPI_SEQ_ELEM_I2C:
868 if (index + 7 > total)
869 return 0;
870 len = *(data + index + 6) + 7;
871 break;
872 default:
873 DRM_ERROR("Unknown operation byte\n");
874 return 0;
875 }
876 }
877
878 return 0;
879 }
880
881 static int goto_next_sequence_v3(const u8 *data, int index, int total)
882 {
883 int seq_end;
884 u16 len;
885 u32 size_of_sequence;
886
887 /*
888 * Could skip sequence based on Size of Sequence alone, but also do some
889 * checking on the structure.
890 */
891 if (total < 5) {
892 DRM_ERROR("Too small sequence size\n");
893 return 0;
894 }
895
896 /* Skip Sequence Byte. */
897 index++;
898
899 /*
900 * Size of Sequence. Excludes the Sequence Byte and the size itself,
901 * includes MIPI_SEQ_ELEM_END byte, excludes the final MIPI_SEQ_END
902 * byte.
903 */
904 size_of_sequence = *((const uint32_t *)(data + index));
905 index += 4;
906
907 seq_end = index + size_of_sequence;
908 if (seq_end > total) {
909 DRM_ERROR("Invalid sequence size\n");
910 return 0;
911 }
912
913 for (; index < total; index += len) {
914 u8 operation_byte = *(data + index);
915 index++;
916
917 if (operation_byte == MIPI_SEQ_ELEM_END) {
918 if (index != seq_end) {
919 DRM_ERROR("Invalid element structure\n");
920 return 0;
921 }
922 return index;
923 }
924
925 len = *(data + index);
926 index++;
927
928 /*
929 * FIXME: Would be nice to check elements like for v1/v2 in
930 * goto_next_sequence() above.
931 */
932 switch (operation_byte) {
933 case MIPI_SEQ_ELEM_SEND_PKT:
934 case MIPI_SEQ_ELEM_DELAY:
935 case MIPI_SEQ_ELEM_GPIO:
936 case MIPI_SEQ_ELEM_I2C:
937 case MIPI_SEQ_ELEM_SPI:
938 case MIPI_SEQ_ELEM_PMIC:
939 break;
940 default:
941 DRM_ERROR("Unknown operation byte %u\n",
942 operation_byte);
943 break;
944 }
945 }
946
947 return 0;
948 }
949
950 static void
951 parse_mipi_sequence(struct drm_i915_private *dev_priv,
952 const struct bdb_header *bdb)
953 {
954 int panel_type = dev_priv->vbt.panel_type;
955 const struct bdb_mipi_sequence *sequence;
956 const u8 *seq_data;
957 u32 seq_size;
958 u8 *data;
959 int index = 0;
960
961 /* Only our generic panel driver uses the sequence block. */
962 if (dev_priv->vbt.dsi.panel_id != MIPI_DSI_GENERIC_PANEL_ID)
963 return;
964
965 sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
966 if (!sequence) {
967 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
968 return;
969 }
970
971 /* Fail gracefully for forward incompatible sequence block. */
972 if (sequence->version >= 4) {
973 DRM_ERROR("Unable to parse MIPI Sequence Block v%u\n",
974 sequence->version);
975 return;
976 }
977
978 DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence->version);
979
980 seq_data = find_panel_sequence_block(sequence, panel_type, &seq_size);
981 if (!seq_data)
982 return;
983
984 data = kmemdup(seq_data, seq_size, GFP_KERNEL);
985 if (!data)
986 return;
987
988 /* Parse the sequences, store pointers to each sequence. */
989 for (;;) {
990 u8 seq_id = *(data + index);
991 if (seq_id == MIPI_SEQ_END)
992 break;
993
994 if (seq_id >= MIPI_SEQ_MAX) {
995 DRM_ERROR("Unknown sequence %u\n", seq_id);
996 goto err;
997 }
998
999 /* Log about presence of sequences we won't run. */
1000 if (seq_id == MIPI_SEQ_TEAR_ON || seq_id == MIPI_SEQ_TEAR_OFF)
1001 DRM_DEBUG_KMS("Unsupported sequence %u\n", seq_id);
1002
1003 dev_priv->vbt.dsi.sequence[seq_id] = data + index;
1004
1005 if (sequence->version >= 3)
1006 index = goto_next_sequence_v3(data, index, seq_size);
1007 else
1008 index = goto_next_sequence(data, index, seq_size);
1009 if (!index) {
1010 DRM_ERROR("Invalid sequence %u\n", seq_id);
1011 goto err;
1012 }
1013 }
1014
1015 dev_priv->vbt.dsi.data = data;
1016 dev_priv->vbt.dsi.size = seq_size;
1017 dev_priv->vbt.dsi.seq_version = sequence->version;
1018
1019 DRM_DEBUG_DRIVER("MIPI related VBT parsing complete\n");
1020 return;
1021
1022 err:
1023 kfree(data);
1024 memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
1025 }
1026
1027 static u8 translate_iboost(u8 val)
1028 {
1029 static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
1030
1031 if (val >= ARRAY_SIZE(mapping)) {
1032 DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
1033 return 0;
1034 }
1035 return mapping[val];
1036 }
1037
1038 static void sanitize_ddc_pin(struct drm_i915_private *dev_priv,
1039 enum port port)
1040 {
1041 const struct ddi_vbt_port_info *info =
1042 &dev_priv->vbt.ddi_port_info[port];
1043 enum port p;
1044
1045 if (!info->alternate_ddc_pin)
1046 return;
1047
1048 for_each_port_masked(p, (1 << port) - 1) {
1049 struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
1050
1051 if (info->alternate_ddc_pin != i->alternate_ddc_pin)
1052 continue;
1053
1054 DRM_DEBUG_KMS("port %c trying to use the same DDC pin (0x%x) as port %c, "
1055 "disabling port %c DVI/HDMI support\n",
1056 port_name(p), i->alternate_ddc_pin,
1057 port_name(port), port_name(p));
1058
1059 /*
1060 * If we have multiple ports supposedly sharing the
1061 * pin, then dvi/hdmi couldn't exist on the shared
1062 * port. Otherwise they share the same ddc bin and
1063 * system couldn't communicate with them separately.
1064 *
1065 * Due to parsing the ports in alphabetical order,
1066 * a higher port will always clobber a lower one.
1067 */
1068 i->supports_dvi = false;
1069 i->supports_hdmi = false;
1070 i->alternate_ddc_pin = 0;
1071 }
1072 }
1073
1074 static void sanitize_aux_ch(struct drm_i915_private *dev_priv,
1075 enum port port)
1076 {
1077 const struct ddi_vbt_port_info *info =
1078 &dev_priv->vbt.ddi_port_info[port];
1079 enum port p;
1080
1081 if (!info->alternate_aux_channel)
1082 return;
1083
1084 for_each_port_masked(p, (1 << port) - 1) {
1085 struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
1086
1087 if (info->alternate_aux_channel != i->alternate_aux_channel)
1088 continue;
1089
1090 DRM_DEBUG_KMS("port %c trying to use the same AUX CH (0x%x) as port %c, "
1091 "disabling port %c DP support\n",
1092 port_name(p), i->alternate_aux_channel,
1093 port_name(port), port_name(p));
1094
1095 /*
1096 * If we have multiple ports supposedlt sharing the
1097 * aux channel, then DP couldn't exist on the shared
1098 * port. Otherwise they share the same aux channel
1099 * and system couldn't communicate with them separately.
1100 *
1101 * Due to parsing the ports in alphabetical order,
1102 * a higher port will always clobber a lower one.
1103 */
1104 i->supports_dp = false;
1105 i->alternate_aux_channel = 0;
1106 }
1107 }
1108
1109 static const u8 cnp_ddc_pin_map[] = {
1110 [0] = 0, /* N/A */
1111 [DDC_BUS_DDI_B] = GMBUS_PIN_1_BXT,
1112 [DDC_BUS_DDI_C] = GMBUS_PIN_2_BXT,
1113 [DDC_BUS_DDI_D] = GMBUS_PIN_4_CNP, /* sic */
1114 [DDC_BUS_DDI_F] = GMBUS_PIN_3_BXT, /* sic */
1115 };
1116
1117 static u8 map_ddc_pin(struct drm_i915_private *dev_priv, u8 vbt_pin)
1118 {
1119 if (HAS_PCH_CNP(dev_priv)) {
1120 if (vbt_pin < ARRAY_SIZE(cnp_ddc_pin_map)) {
1121 return cnp_ddc_pin_map[vbt_pin];
1122 } else {
1123 DRM_DEBUG_KMS("Ignoring alternate pin: VBT claims DDC pin %d, which is not valid for this platform\n", vbt_pin);
1124 return 0;
1125 }
1126 }
1127
1128 return vbt_pin;
1129 }
1130
1131 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
1132 u8 bdb_version)
1133 {
1134 struct child_device_config *it, *child = NULL;
1135 struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
1136 uint8_t hdmi_level_shift;
1137 int i, j;
1138 bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
1139 uint8_t aux_channel, ddc_pin;
1140 /* Each DDI port can have more than one value on the "DVO Port" field,
1141 * so look for all the possible values for each port.
1142 */
1143 int dvo_ports[][3] = {
1144 {DVO_PORT_HDMIA, DVO_PORT_DPA, -1},
1145 {DVO_PORT_HDMIB, DVO_PORT_DPB, -1},
1146 {DVO_PORT_HDMIC, DVO_PORT_DPC, -1},
1147 {DVO_PORT_HDMID, DVO_PORT_DPD, -1},
1148 {DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE},
1149 };
1150
1151 /*
1152 * Find the first child device to reference the port, report if more
1153 * than one found.
1154 */
1155 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1156 it = dev_priv->vbt.child_dev + i;
1157
1158 for (j = 0; j < 3; j++) {
1159 if (dvo_ports[port][j] == -1)
1160 break;
1161
1162 if (it->dvo_port == dvo_ports[port][j]) {
1163 if (child) {
1164 DRM_DEBUG_KMS("More than one child device for port %c in VBT, using the first.\n",
1165 port_name(port));
1166 } else {
1167 child = it;
1168 }
1169 }
1170 }
1171 }
1172 if (!child)
1173 return;
1174
1175 aux_channel = child->aux_channel;
1176 ddc_pin = child->ddc_pin;
1177
1178 is_dvi = child->device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
1179 is_dp = child->device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
1180 is_crt = child->device_type & DEVICE_TYPE_ANALOG_OUTPUT;
1181 is_hdmi = is_dvi && (child->device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
1182 is_edp = is_dp && (child->device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
1183
1184 if (port == PORT_A && is_dvi) {
1185 DRM_DEBUG_KMS("VBT claims port A supports DVI%s, ignoring\n",
1186 is_hdmi ? "/HDMI" : "");
1187 is_dvi = false;
1188 is_hdmi = false;
1189 }
1190
1191 if (port == PORT_A && is_dvi) {
1192 DRM_DEBUG_KMS("VBT claims port A supports DVI%s, ignoring\n",
1193 is_hdmi ? "/HDMI" : "");
1194 is_dvi = false;
1195 is_hdmi = false;
1196 }
1197
1198 info->supports_dvi = is_dvi;
1199 info->supports_hdmi = is_hdmi;
1200 info->supports_dp = is_dp;
1201 info->supports_edp = is_edp;
1202
1203 DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
1204 port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
1205
1206 if (is_edp && is_dvi)
1207 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
1208 port_name(port));
1209 if (is_crt && port != PORT_E)
1210 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
1211 if (is_crt && (is_dvi || is_dp))
1212 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
1213 port_name(port));
1214 if (is_dvi && (port == PORT_A || port == PORT_E))
1215 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
1216 if (!is_dvi && !is_dp && !is_crt)
1217 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
1218 port_name(port));
1219 if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
1220 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
1221
1222 if (is_dvi) {
1223 info->alternate_ddc_pin = map_ddc_pin(dev_priv, ddc_pin);
1224
1225 sanitize_ddc_pin(dev_priv, port);
1226 }
1227
1228 if (is_dp) {
1229 info->alternate_aux_channel = aux_channel;
1230
1231 sanitize_aux_ch(dev_priv, port);
1232 }
1233
1234 if (bdb_version >= 158) {
1235 /* The VBT HDMI level shift values match the table we have. */
1236 hdmi_level_shift = child->hdmi_level_shifter_value;
1237 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1238 port_name(port),
1239 hdmi_level_shift);
1240 info->hdmi_level_shift = hdmi_level_shift;
1241 }
1242
1243 if (bdb_version >= 204) {
1244 int max_tmds_clock;
1245
1246 switch (child->hdmi_max_data_rate) {
1247 default:
1248 MISSING_CASE(child->hdmi_max_data_rate);
1249 /* fall through */
1250 case HDMI_MAX_DATA_RATE_PLATFORM:
1251 max_tmds_clock = 0;
1252 break;
1253 case HDMI_MAX_DATA_RATE_297:
1254 max_tmds_clock = 297000;
1255 break;
1256 case HDMI_MAX_DATA_RATE_165:
1257 max_tmds_clock = 165000;
1258 break;
1259 }
1260
1261 if (max_tmds_clock)
1262 DRM_DEBUG_KMS("VBT HDMI max TMDS clock for port %c: %d kHz\n",
1263 port_name(port), max_tmds_clock);
1264 info->max_tmds_clock = max_tmds_clock;
1265 }
1266
1267 /* Parse the I_boost config for SKL and above */
1268 if (bdb_version >= 196 && child->iboost) {
1269 info->dp_boost_level = translate_iboost(child->dp_iboost_level);
1270 DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
1271 port_name(port), info->dp_boost_level);
1272 info->hdmi_boost_level = translate_iboost(child->hdmi_iboost_level);
1273 DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
1274 port_name(port), info->hdmi_boost_level);
1275 }
1276 }
1277
1278 static void parse_ddi_ports(struct drm_i915_private *dev_priv, u8 bdb_version)
1279 {
1280 enum port port;
1281
1282 if (!HAS_DDI(dev_priv) && !IS_CHERRYVIEW(dev_priv))
1283 return;
1284
1285 if (!dev_priv->vbt.child_dev_num)
1286 return;
1287
1288 if (bdb_version < 155)
1289 return;
1290
1291 for (port = PORT_A; port < I915_MAX_PORTS; port++)
1292 parse_ddi_port(dev_priv, port, bdb_version);
1293 }
1294
1295 static void
1296 parse_general_definitions(struct drm_i915_private *dev_priv,
1297 const struct bdb_header *bdb)
1298 {
1299 const struct bdb_general_definitions *defs;
1300 const struct child_device_config *child;
1301 int i, child_device_num, count;
1302 u8 expected_size;
1303 u16 block_size;
1304 int bus_pin;
1305
1306 defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1307 if (!defs) {
1308 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1309 return;
1310 }
1311
1312 block_size = get_blocksize(defs);
1313 if (block_size < sizeof(*defs)) {
1314 DRM_DEBUG_KMS("General definitions block too small (%u)\n",
1315 block_size);
1316 return;
1317 }
1318
1319 bus_pin = defs->crt_ddc_gmbus_pin;
1320 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
1321 if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
1322 dev_priv->vbt.crt_ddc_pin = bus_pin;
1323
1324 if (bdb->version < 106) {
1325 expected_size = 22;
1326 } else if (bdb->version < 111) {
1327 expected_size = 27;
1328 } else if (bdb->version < 195) {
1329 expected_size = LEGACY_CHILD_DEVICE_CONFIG_SIZE;
1330 } else if (bdb->version == 195) {
1331 expected_size = 37;
1332 } else if (bdb->version <= 215) {
1333 expected_size = 38;
1334 } else if (bdb->version <= 216) {
1335 expected_size = 39;
1336 } else {
1337 expected_size = sizeof(*child);
1338 BUILD_BUG_ON(sizeof(*child) < 39);
1339 DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
1340 bdb->version, expected_size);
1341 }
1342
1343 /* Flag an error for unexpected size, but continue anyway. */
1344 if (defs->child_dev_size != expected_size)
1345 DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n",
1346 defs->child_dev_size, expected_size, bdb->version);
1347
1348 /* The legacy sized child device config is the minimum we need. */
1349 if (defs->child_dev_size < LEGACY_CHILD_DEVICE_CONFIG_SIZE) {
1350 DRM_DEBUG_KMS("Child device config size %u is too small.\n",
1351 defs->child_dev_size);
1352 return;
1353 }
1354
1355 /* get the number of child device */
1356 child_device_num = (block_size - sizeof(*defs)) / defs->child_dev_size;
1357 count = 0;
1358 /* get the number of child device that is present */
1359 for (i = 0; i < child_device_num; i++) {
1360 child = child_device_ptr(defs, i);
1361 if (!child->device_type)
1362 continue;
1363 count++;
1364 }
1365 if (!count) {
1366 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1367 return;
1368 }
1369 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*child), GFP_KERNEL);
1370 if (!dev_priv->vbt.child_dev) {
1371 DRM_DEBUG_KMS("No memory space for child device\n");
1372 return;
1373 }
1374
1375 dev_priv->vbt.child_dev_num = count;
1376 count = 0;
1377 for (i = 0; i < child_device_num; i++) {
1378 child = child_device_ptr(defs, i);
1379 if (!child->device_type)
1380 continue;
1381
1382 /*
1383 * Copy as much as we know (sizeof) and is available
1384 * (child_dev_size) of the child device. Accessing the data must
1385 * depend on VBT version.
1386 */
1387 memcpy(dev_priv->vbt.child_dev + count, child,
1388 min_t(size_t, defs->child_dev_size, sizeof(*child)));
1389 count++;
1390 }
1391 }
1392
1393 /* Common defaults which may be overridden by VBT. */
1394 static void
1395 init_vbt_defaults(struct drm_i915_private *dev_priv)
1396 {
1397 enum port port;
1398
1399 dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
1400
1401 /* Default to having backlight */
1402 dev_priv->vbt.backlight.present = true;
1403
1404 /* LFP panel data */
1405 dev_priv->vbt.lvds_dither = 1;
1406 dev_priv->vbt.lvds_vbt = 0;
1407
1408 /* SDVO panel data */
1409 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1410
1411 /* general features */
1412 dev_priv->vbt.int_tv_support = 1;
1413 dev_priv->vbt.int_crt_support = 1;
1414
1415 /* Default to using SSC */
1416 dev_priv->vbt.lvds_use_ssc = 1;
1417 /*
1418 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1419 * clock for LVDS.
1420 */
1421 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev_priv,
1422 !HAS_PCH_SPLIT(dev_priv));
1423 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1424
1425 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1426 struct ddi_vbt_port_info *info =
1427 &dev_priv->vbt.ddi_port_info[port];
1428
1429 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1430 }
1431 }
1432
1433 /* Defaults to initialize only if there is no VBT. */
1434 static void
1435 init_vbt_missing_defaults(struct drm_i915_private *dev_priv)
1436 {
1437 enum port port;
1438
1439 for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1440 struct ddi_vbt_port_info *info =
1441 &dev_priv->vbt.ddi_port_info[port];
1442
1443 info->supports_dvi = (port != PORT_A && port != PORT_E);
1444 info->supports_hdmi = info->supports_dvi;
1445 info->supports_dp = (port != PORT_E);
1446 }
1447 }
1448
1449 static const struct bdb_header *get_bdb_header(const struct vbt_header *vbt)
1450 {
1451 const void *_vbt = vbt;
1452
1453 return _vbt + vbt->bdb_offset;
1454 }
1455
1456 /**
1457 * intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
1458 * @buf: pointer to a buffer to validate
1459 * @size: size of the buffer
1460 *
1461 * Returns true on valid VBT.
1462 */
1463 bool intel_bios_is_valid_vbt(const void *buf, size_t size)
1464 {
1465 const struct vbt_header *vbt = buf;
1466 const struct bdb_header *bdb;
1467
1468 if (!vbt)
1469 return false;
1470
1471 if (sizeof(struct vbt_header) > size) {
1472 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1473 return false;
1474 }
1475
1476 if (memcmp(vbt->signature, "$VBT", 4)) {
1477 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1478 return false;
1479 }
1480
1481 if (range_overflows_t(size_t,
1482 vbt->bdb_offset,
1483 sizeof(struct bdb_header),
1484 size)) {
1485 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1486 return false;
1487 }
1488
1489 bdb = get_bdb_header(vbt);
1490 if (range_overflows_t(size_t, vbt->bdb_offset, bdb->bdb_size, size)) {
1491 DRM_DEBUG_DRIVER("BDB incomplete\n");
1492 return false;
1493 }
1494
1495 return vbt;
1496 }
1497
1498 static const struct vbt_header *find_vbt(void __iomem *bios, size_t size)
1499 {
1500 size_t i;
1501
1502 /* Scour memory looking for the VBT signature. */
1503 for (i = 0; i + 4 < size; i++) {
1504 void *vbt;
1505
1506 if (ioread32(bios + i) != *((const u32 *) "$VBT"))
1507 continue;
1508
1509 /*
1510 * This is the one place where we explicitly discard the address
1511 * space (__iomem) of the BIOS/VBT.
1512 */
1513 vbt = (void __force *) bios + i;
1514 if (intel_bios_is_valid_vbt(vbt, size - i))
1515 return vbt;
1516
1517 break;
1518 }
1519
1520 return NULL;
1521 }
1522
1523 /**
1524 * intel_bios_init - find VBT and initialize settings from the BIOS
1525 * @dev_priv: i915 device instance
1526 *
1527 * Parse and initialize settings from the Video BIOS Tables (VBT). If the VBT
1528 * was not found in ACPI OpRegion, try to find it in PCI ROM first. Also
1529 * initialize some defaults if the VBT is not present at all.
1530 */
1531 void intel_bios_init(struct drm_i915_private *dev_priv)
1532 {
1533 struct pci_dev *pdev = dev_priv->drm.pdev;
1534 const struct vbt_header *vbt = dev_priv->opregion.vbt;
1535 const struct bdb_header *bdb;
1536 u8 __iomem *bios = NULL;
1537
1538 if (HAS_PCH_NOP(dev_priv)) {
1539 DRM_DEBUG_KMS("Skipping VBT init due to disabled display.\n");
1540 return;
1541 }
1542
1543 init_vbt_defaults(dev_priv);
1544
1545 /* If the OpRegion does not have VBT, look in PCI ROM. */
1546 if (!vbt) {
1547 size_t size;
1548
1549 bios = pci_map_rom(pdev, &size);
1550 if (!bios)
1551 goto out;
1552
1553 vbt = find_vbt(bios, size);
1554 if (!vbt)
1555 goto out;
1556
1557 DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
1558 }
1559
1560 bdb = get_bdb_header(vbt);
1561
1562 DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
1563 (int)sizeof(vbt->signature), vbt->signature, bdb->version);
1564
1565 /* Grab useful general definitions */
1566 parse_general_features(dev_priv, bdb);
1567 parse_general_definitions(dev_priv, bdb);
1568 parse_lfp_panel_data(dev_priv, bdb);
1569 parse_lfp_backlight(dev_priv, bdb);
1570 parse_sdvo_panel_data(dev_priv, bdb);
1571 parse_driver_features(dev_priv, bdb);
1572 parse_edp(dev_priv, bdb);
1573 parse_psr(dev_priv, bdb);
1574 parse_mipi_config(dev_priv, bdb);
1575 parse_mipi_sequence(dev_priv, bdb);
1576
1577 /* Further processing on pre-parsed data */
1578 parse_sdvo_device_mapping(dev_priv, bdb->version);
1579 parse_ddi_ports(dev_priv, bdb->version);
1580
1581 out:
1582 if (!vbt) {
1583 DRM_INFO("Failed to find VBIOS tables (VBT)\n");
1584 init_vbt_missing_defaults(dev_priv);
1585 }
1586
1587 if (bios)
1588 pci_unmap_rom(pdev, bios);
1589 }
1590
1591 /**
1592 * intel_bios_is_tv_present - is integrated TV present in VBT
1593 * @dev_priv: i915 device instance
1594 *
1595 * Return true if TV is present. If no child devices were parsed from VBT,
1596 * assume TV is present.
1597 */
1598 bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv)
1599 {
1600 const struct child_device_config *child;
1601 int i;
1602
1603 if (!dev_priv->vbt.int_tv_support)
1604 return false;
1605
1606 if (!dev_priv->vbt.child_dev_num)
1607 return true;
1608
1609 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1610 child = dev_priv->vbt.child_dev + i;
1611 /*
1612 * If the device type is not TV, continue.
1613 */
1614 switch (child->device_type) {
1615 case DEVICE_TYPE_INT_TV:
1616 case DEVICE_TYPE_TV:
1617 case DEVICE_TYPE_TV_SVIDEO_COMPOSITE:
1618 break;
1619 default:
1620 continue;
1621 }
1622 /* Only when the addin_offset is non-zero, it is regarded
1623 * as present.
1624 */
1625 if (child->addin_offset)
1626 return true;
1627 }
1628
1629 return false;
1630 }
1631
1632 /**
1633 * intel_bios_is_lvds_present - is LVDS present in VBT
1634 * @dev_priv: i915 device instance
1635 * @i2c_pin: i2c pin for LVDS if present
1636 *
1637 * Return true if LVDS is present. If no child devices were parsed from VBT,
1638 * assume LVDS is present.
1639 */
1640 bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin)
1641 {
1642 const struct child_device_config *child;
1643 int i;
1644
1645 if (!dev_priv->vbt.child_dev_num)
1646 return true;
1647
1648 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1649 child = dev_priv->vbt.child_dev + i;
1650
1651 /* If the device type is not LFP, continue.
1652 * We have to check both the new identifiers as well as the
1653 * old for compatibility with some BIOSes.
1654 */
1655 if (child->device_type != DEVICE_TYPE_INT_LFP &&
1656 child->device_type != DEVICE_TYPE_LFP)
1657 continue;
1658
1659 if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
1660 *i2c_pin = child->i2c_pin;
1661
1662 /* However, we cannot trust the BIOS writers to populate
1663 * the VBT correctly. Since LVDS requires additional
1664 * information from AIM blocks, a non-zero addin offset is
1665 * a good indicator that the LVDS is actually present.
1666 */
1667 if (child->addin_offset)
1668 return true;
1669
1670 /* But even then some BIOS writers perform some black magic
1671 * and instantiate the device without reference to any
1672 * additional data. Trust that if the VBT was written into
1673 * the OpRegion then they have validated the LVDS's existence.
1674 */
1675 if (dev_priv->opregion.vbt)
1676 return true;
1677 }
1678
1679 return false;
1680 }
1681
1682 /**
1683 * intel_bios_is_port_present - is the specified digital port present
1684 * @dev_priv: i915 device instance
1685 * @port: port to check
1686 *
1687 * Return true if the device in %port is present.
1688 */
1689 bool intel_bios_is_port_present(struct drm_i915_private *dev_priv, enum port port)
1690 {
1691 const struct child_device_config *child;
1692 static const struct {
1693 u16 dp, hdmi;
1694 } port_mapping[] = {
1695 [PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },
1696 [PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },
1697 [PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },
1698 [PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },
1699 };
1700 int i;
1701
1702 /* FIXME maybe deal with port A as well? */
1703 if (WARN_ON(port == PORT_A) || port >= ARRAY_SIZE(port_mapping))
1704 return false;
1705
1706 if (!dev_priv->vbt.child_dev_num)
1707 return false;
1708
1709 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1710 child = dev_priv->vbt.child_dev + i;
1711
1712 if ((child->dvo_port == port_mapping[port].dp ||
1713 child->dvo_port == port_mapping[port].hdmi) &&
1714 (child->device_type & (DEVICE_TYPE_TMDS_DVI_SIGNALING |
1715 DEVICE_TYPE_DISPLAYPORT_OUTPUT)))
1716 return true;
1717 }
1718
1719 return false;
1720 }
1721
1722 /**
1723 * intel_bios_is_port_edp - is the device in given port eDP
1724 * @dev_priv: i915 device instance
1725 * @port: port to check
1726 *
1727 * Return true if the device in %port is eDP.
1728 */
1729 bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
1730 {
1731 const struct child_device_config *child;
1732 static const short port_mapping[] = {
1733 [PORT_B] = DVO_PORT_DPB,
1734 [PORT_C] = DVO_PORT_DPC,
1735 [PORT_D] = DVO_PORT_DPD,
1736 [PORT_E] = DVO_PORT_DPE,
1737 };
1738 int i;
1739
1740 if (HAS_DDI(dev_priv))
1741 return dev_priv->vbt.ddi_port_info[port].supports_edp;
1742
1743 if (!dev_priv->vbt.child_dev_num)
1744 return false;
1745
1746 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1747 child = dev_priv->vbt.child_dev + i;
1748
1749 if (child->dvo_port == port_mapping[port] &&
1750 (child->device_type & DEVICE_TYPE_eDP_BITS) ==
1751 (DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS))
1752 return true;
1753 }
1754
1755 return false;
1756 }
1757
1758 static bool child_dev_is_dp_dual_mode(const struct child_device_config *child,
1759 enum port port)
1760 {
1761 static const struct {
1762 u16 dp, hdmi;
1763 } port_mapping[] = {
1764 /*
1765 * Buggy VBTs may declare DP ports as having
1766 * HDMI type dvo_port :( So let's check both.
1767 */
1768 [PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },
1769 [PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },
1770 [PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },
1771 [PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },
1772 };
1773
1774 if (port == PORT_A || port >= ARRAY_SIZE(port_mapping))
1775 return false;
1776
1777 if ((child->device_type & DEVICE_TYPE_DP_DUAL_MODE_BITS) !=
1778 (DEVICE_TYPE_DP_DUAL_MODE & DEVICE_TYPE_DP_DUAL_MODE_BITS))
1779 return false;
1780
1781 if (child->dvo_port == port_mapping[port].dp)
1782 return true;
1783
1784 /* Only accept a HDMI dvo_port as DP++ if it has an AUX channel */
1785 if (child->dvo_port == port_mapping[port].hdmi &&
1786 child->aux_channel != 0)
1787 return true;
1788
1789 return false;
1790 }
1791
1792 bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *dev_priv,
1793 enum port port)
1794 {
1795 const struct child_device_config *child;
1796 int i;
1797
1798 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1799 child = dev_priv->vbt.child_dev + i;
1800
1801 if (child_dev_is_dp_dual_mode(child, port))
1802 return true;
1803 }
1804
1805 return false;
1806 }
1807
1808 /**
1809 * intel_bios_is_dsi_present - is DSI present in VBT
1810 * @dev_priv: i915 device instance
1811 * @port: port for DSI if present
1812 *
1813 * Return true if DSI is present, and return the port in %port.
1814 */
1815 bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
1816 enum port *port)
1817 {
1818 const struct child_device_config *child;
1819 u8 dvo_port;
1820 int i;
1821
1822 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1823 child = dev_priv->vbt.child_dev + i;
1824
1825 if (!(child->device_type & DEVICE_TYPE_MIPI_OUTPUT))
1826 continue;
1827
1828 dvo_port = child->dvo_port;
1829
1830 switch (dvo_port) {
1831 case DVO_PORT_MIPIA:
1832 case DVO_PORT_MIPIC:
1833 if (port)
1834 *port = dvo_port - DVO_PORT_MIPIA;
1835 return true;
1836 case DVO_PORT_MIPIB:
1837 case DVO_PORT_MIPID:
1838 DRM_DEBUG_KMS("VBT has unsupported DSI port %c\n",
1839 port_name(dvo_port - DVO_PORT_MIPIA));
1840 break;
1841 }
1842 }
1843
1844 return false;
1845 }
1846
1847 /**
1848 * intel_bios_is_port_hpd_inverted - is HPD inverted for %port
1849 * @dev_priv: i915 device instance
1850 * @port: port to check
1851 *
1852 * Return true if HPD should be inverted for %port.
1853 */
1854 bool
1855 intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
1856 enum port port)
1857 {
1858 const struct child_device_config *child;
1859 int i;
1860
1861 if (WARN_ON_ONCE(!IS_GEN9_LP(dev_priv)))
1862 return false;
1863
1864 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1865 child = dev_priv->vbt.child_dev + i;
1866
1867 if (!child->hpd_invert)
1868 continue;
1869
1870 switch (child->dvo_port) {
1871 case DVO_PORT_DPA:
1872 case DVO_PORT_HDMIA:
1873 if (port == PORT_A)
1874 return true;
1875 break;
1876 case DVO_PORT_DPB:
1877 case DVO_PORT_HDMIB:
1878 if (port == PORT_B)
1879 return true;
1880 break;
1881 case DVO_PORT_DPC:
1882 case DVO_PORT_HDMIC:
1883 if (port == PORT_C)
1884 return true;
1885 break;
1886 default:
1887 break;
1888 }
1889 }
1890
1891 return false;
1892 }
1893
1894 /**
1895 * intel_bios_is_lspcon_present - if LSPCON is attached on %port
1896 * @dev_priv: i915 device instance
1897 * @port: port to check
1898 *
1899 * Return true if LSPCON is present on this port
1900 */
1901 bool
1902 intel_bios_is_lspcon_present(struct drm_i915_private *dev_priv,
1903 enum port port)
1904 {
1905 const struct child_device_config *child;
1906 int i;
1907
1908 if (!HAS_LSPCON(dev_priv))
1909 return false;
1910
1911 for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1912 child = dev_priv->vbt.child_dev + i;
1913
1914 if (!child->lspcon)
1915 continue;
1916
1917 switch (child->dvo_port) {
1918 case DVO_PORT_DPA:
1919 case DVO_PORT_HDMIA:
1920 if (port == PORT_A)
1921 return true;
1922 break;
1923 case DVO_PORT_DPB:
1924 case DVO_PORT_HDMIB:
1925 if (port == PORT_B)
1926 return true;
1927 break;
1928 case DVO_PORT_DPC:
1929 case DVO_PORT_HDMIC:
1930 if (port == PORT_C)
1931 return true;
1932 break;
1933 case DVO_PORT_DPD:
1934 case DVO_PORT_HDMID:
1935 if (port == PORT_D)
1936 return true;
1937 break;
1938 default:
1939 break;
1940 }
1941 }
1942
1943 return false;
1944 }
CRIS linux kernel tree