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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / gpu / drm / i915 / intel_bios.c
blob53f2bed8bc5fabf812c16bb74a030e105bb386aa
1 /*
2 * Copyright © 2006 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27 #include <linux/dmi.h>
28 #include <drm/drm_dp_helper.h>
29 #include <drm/drmP.h>
30 #include <drm/i915_drm.h>
31 #include "i915_drv.h"
32 #include "intel_bios.h"
33
34 #define SLAVE_ADDR1 0x70
35 #define SLAVE_ADDR2 0x72
36
37 static int panel_type;
38
39 static void *
40 find_section(struct bdb_header *bdb, int section_id)
41 {
42 u8 *base = (u8 *)bdb;
43 int index = 0;
44 u16 total, current_size;
45 u8 current_id;
46
47 /* skip to first section */
48 index += bdb->header_size;
49 total = bdb->bdb_size;
50
51 /* walk the sections looking for section_id */
52 while (index < total) {
53 current_id = *(base + index);
54 index++;
55 current_size = *((u16 *)(base + index));
56 index += 2;
57 if (current_id == section_id)
58 return base + index;
59 index += current_size;
60 }
61
62 return NULL;
63 }
64
65 static u16
66 get_blocksize(void *p)
67 {
68 u16 *block_ptr, block_size;
69
70 block_ptr = (u16 *)((char *)p - 2);
71 block_size = *block_ptr;
72 return block_size;
73 }
74
75 static void
76 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
77 const struct lvds_dvo_timing *dvo_timing)
78 {
79 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
80 dvo_timing->hactive_lo;
81 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
82 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
83 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
84 dvo_timing->hsync_pulse_width;
85 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
86 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
87
88 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
89 dvo_timing->vactive_lo;
90 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
91 dvo_timing->vsync_off;
92 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
93 dvo_timing->vsync_pulse_width;
94 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
95 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
96 panel_fixed_mode->clock = dvo_timing->clock * 10;
97 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
98
99 if (dvo_timing->hsync_positive)
100 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
101 else
102 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
103
104 if (dvo_timing->vsync_positive)
105 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
106 else
107 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
108
109 /* Some VBTs have bogus h/vtotal values */
110 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
111 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
112 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
113 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
114
115 drm_mode_set_name(panel_fixed_mode);
116 }
117
118 static bool
119 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
120 const struct lvds_dvo_timing *b)
121 {
122 if (a->hactive_hi != b->hactive_hi ||
123 a->hactive_lo != b->hactive_lo)
124 return false;
125
126 if (a->hsync_off_hi != b->hsync_off_hi ||
127 a->hsync_off_lo != b->hsync_off_lo)
128 return false;
129
130 if (a->hsync_pulse_width != b->hsync_pulse_width)
131 return false;
132
133 if (a->hblank_hi != b->hblank_hi ||
134 a->hblank_lo != b->hblank_lo)
135 return false;
136
137 if (a->vactive_hi != b->vactive_hi ||
138 a->vactive_lo != b->vactive_lo)
139 return false;
140
141 if (a->vsync_off != b->vsync_off)
142 return false;
143
144 if (a->vsync_pulse_width != b->vsync_pulse_width)
145 return false;
146
147 if (a->vblank_hi != b->vblank_hi ||
148 a->vblank_lo != b->vblank_lo)
149 return false;
150
151 return true;
152 }
153
154 static const struct lvds_dvo_timing *
155 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
156 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
157 int index)
158 {
159 /*
160 * the size of fp_timing varies on the different platform.
161 * So calculate the DVO timing relative offset in LVDS data
162 * entry to get the DVO timing entry
163 */
164
165 int lfp_data_size =
166 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
167 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
168 int dvo_timing_offset =
169 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
170 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
171 char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
172
173 return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
174 }
175
176 /* get lvds_fp_timing entry
177 * this function may return NULL if the corresponding entry is invalid
178 */
179 static const struct lvds_fp_timing *
180 get_lvds_fp_timing(const struct bdb_header *bdb,
181 const struct bdb_lvds_lfp_data *data,
182 const struct bdb_lvds_lfp_data_ptrs *ptrs,
183 int index)
184 {
185 size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
186 u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
187 size_t ofs;
188
189 if (index >= ARRAY_SIZE(ptrs->ptr))
190 return NULL;
191 ofs = ptrs->ptr[index].fp_timing_offset;
192 if (ofs < data_ofs ||
193 ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
194 return NULL;
195 return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
196 }
197
198 /* Try to find integrated panel data */
199 static void
200 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
201 struct bdb_header *bdb)
202 {
203 const struct bdb_lvds_options *lvds_options;
204 const struct bdb_lvds_lfp_data *lvds_lfp_data;
205 const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
206 const struct lvds_dvo_timing *panel_dvo_timing;
207 const struct lvds_fp_timing *fp_timing;
208 struct drm_display_mode *panel_fixed_mode;
209 int i, downclock;
210
211 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
212 if (!lvds_options)
213 return;
214
215 dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
216 if (lvds_options->panel_type == 0xff)
217 return;
218
219 panel_type = lvds_options->panel_type;
220
221 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
222 if (!lvds_lfp_data)
223 return;
224
225 lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
226 if (!lvds_lfp_data_ptrs)
227 return;
228
229 dev_priv->vbt.lvds_vbt = 1;
230
231 panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
232 lvds_lfp_data_ptrs,
233 lvds_options->panel_type);
234
235 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
236 if (!panel_fixed_mode)
237 return;
238
239 fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
240
241 dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
242
243 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
244 drm_mode_debug_printmodeline(panel_fixed_mode);
245
246 /*
247 * Iterate over the LVDS panel timing info to find the lowest clock
248 * for the native resolution.
249 */
250 downclock = panel_dvo_timing->clock;
251 for (i = 0; i < 16; i++) {
252 const struct lvds_dvo_timing *dvo_timing;
253
254 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
255 lvds_lfp_data_ptrs,
256 i);
257 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
258 dvo_timing->clock < downclock)
259 downclock = dvo_timing->clock;
260 }
261
262 if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
263 dev_priv->lvds_downclock_avail = 1;
264 dev_priv->lvds_downclock = downclock * 10;
265 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
266 "Normal Clock %dKHz, downclock %dKHz\n",
267 panel_fixed_mode->clock, 10*downclock);
268 }
269
270 fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
271 lvds_lfp_data_ptrs,
272 lvds_options->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 /* Try to find sdvo panel data */
285 static void
286 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
287 struct bdb_header *bdb)
288 {
289 struct lvds_dvo_timing *dvo_timing;
290 struct drm_display_mode *panel_fixed_mode;
291 int index;
292
293 index = i915_vbt_sdvo_panel_type;
294 if (index == -2) {
295 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
296 return;
297 }
298
299 if (index == -1) {
300 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
301
302 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
303 if (!sdvo_lvds_options)
304 return;
305
306 index = sdvo_lvds_options->panel_type;
307 }
308
309 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
310 if (!dvo_timing)
311 return;
312
313 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
314 if (!panel_fixed_mode)
315 return;
316
317 fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
318
319 dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
320
321 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
322 drm_mode_debug_printmodeline(panel_fixed_mode);
323 }
324
325 static int intel_bios_ssc_frequency(struct drm_device *dev,
326 bool alternate)
327 {
328 switch (INTEL_INFO(dev)->gen) {
329 case 2:
330 return alternate ? 66 : 48;
331 case 3:
332 case 4:
333 return alternate ? 100 : 96;
334 default:
335 return alternate ? 100 : 120;
336 }
337 }
338
339 static void
340 parse_general_features(struct drm_i915_private *dev_priv,
341 struct bdb_header *bdb)
342 {
343 struct drm_device *dev = dev_priv->dev;
344 struct bdb_general_features *general;
345
346 general = find_section(bdb, BDB_GENERAL_FEATURES);
347 if (general) {
348 dev_priv->vbt.int_tv_support = general->int_tv_support;
349 dev_priv->vbt.int_crt_support = general->int_crt_support;
350 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
351 dev_priv->vbt.lvds_ssc_freq =
352 intel_bios_ssc_frequency(dev, general->ssc_freq);
353 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
354 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
355 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",
356 dev_priv->vbt.int_tv_support,
357 dev_priv->vbt.int_crt_support,
358 dev_priv->vbt.lvds_use_ssc,
359 dev_priv->vbt.lvds_ssc_freq,
360 dev_priv->vbt.display_clock_mode,
361 dev_priv->vbt.fdi_rx_polarity_inverted);
362 }
363 }
364
365 static void
366 parse_general_definitions(struct drm_i915_private *dev_priv,
367 struct bdb_header *bdb)
368 {
369 struct bdb_general_definitions *general;
370
371 general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
372 if (general) {
373 u16 block_size = get_blocksize(general);
374 if (block_size >= sizeof(*general)) {
375 int bus_pin = general->crt_ddc_gmbus_pin;
376 DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
377 if (intel_gmbus_is_port_valid(bus_pin))
378 dev_priv->vbt.crt_ddc_pin = bus_pin;
379 } else {
380 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
381 block_size);
382 }
383 }
384 }
385
386 static void
387 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
388 struct bdb_header *bdb)
389 {
390 struct sdvo_device_mapping *p_mapping;
391 struct bdb_general_definitions *p_defs;
392 struct child_device_config *p_child;
393 int i, child_device_num, count;
394 u16 block_size;
395
396 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
397 if (!p_defs) {
398 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
399 return;
400 }
401 /* judge whether the size of child device meets the requirements.
402 * If the child device size obtained from general definition block
403 * is different with sizeof(struct child_device_config), skip the
404 * parsing of sdvo device info
405 */
406 if (p_defs->child_dev_size != sizeof(*p_child)) {
407 /* different child dev size . Ignore it */
408 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
409 return;
410 }
411 /* get the block size of general definitions */
412 block_size = get_blocksize(p_defs);
413 /* get the number of child device */
414 child_device_num = (block_size - sizeof(*p_defs)) /
415 sizeof(*p_child);
416 count = 0;
417 for (i = 0; i < child_device_num; i++) {
418 p_child = &(p_defs->devices[i]);
419 if (!p_child->device_type) {
420 /* skip the device block if device type is invalid */
421 continue;
422 }
423 if (p_child->slave_addr != SLAVE_ADDR1 &&
424 p_child->slave_addr != SLAVE_ADDR2) {
425 /*
426 * If the slave address is neither 0x70 nor 0x72,
427 * it is not a SDVO device. Skip it.
428 */
429 continue;
430 }
431 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
432 p_child->dvo_port != DEVICE_PORT_DVOC) {
433 /* skip the incorrect SDVO port */
434 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
435 continue;
436 }
437 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
438 " %s port\n",
439 p_child->slave_addr,
440 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
441 "SDVOB" : "SDVOC");
442 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
443 if (!p_mapping->initialized) {
444 p_mapping->dvo_port = p_child->dvo_port;
445 p_mapping->slave_addr = p_child->slave_addr;
446 p_mapping->dvo_wiring = p_child->dvo_wiring;
447 p_mapping->ddc_pin = p_child->ddc_pin;
448 p_mapping->i2c_pin = p_child->i2c_pin;
449 p_mapping->initialized = 1;
450 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
451 p_mapping->dvo_port,
452 p_mapping->slave_addr,
453 p_mapping->dvo_wiring,
454 p_mapping->ddc_pin,
455 p_mapping->i2c_pin);
456 } else {
457 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
458 "two SDVO device.\n");
459 }
460 if (p_child->slave2_addr) {
461 /* Maybe this is a SDVO device with multiple inputs */
462 /* And the mapping info is not added */
463 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
464 " is a SDVO device with multiple inputs.\n");
465 }
466 count++;
467 }
468
469 if (!count) {
470 /* No SDVO device info is found */
471 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
472 }
473 return;
474 }
475
476 static void
477 parse_driver_features(struct drm_i915_private *dev_priv,
478 struct bdb_header *bdb)
479 {
480 struct drm_device *dev = dev_priv->dev;
481 struct bdb_driver_features *driver;
482
483 driver = find_section(bdb, BDB_DRIVER_FEATURES);
484 if (!driver)
485 return;
486
487 if (SUPPORTS_EDP(dev) &&
488 driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
489 dev_priv->vbt.edp_support = 1;
490
491 if (driver->dual_frequency)
492 dev_priv->render_reclock_avail = true;
493 }
494
495 static void
496 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
497 {
498 struct bdb_edp *edp;
499 struct edp_power_seq *edp_pps;
500 struct edp_link_params *edp_link_params;
501
502 edp = find_section(bdb, BDB_EDP);
503 if (!edp) {
504 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->vbt.edp_support)
505 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
506 return;
507 }
508
509 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
510 case EDP_18BPP:
511 dev_priv->vbt.edp_bpp = 18;
512 break;
513 case EDP_24BPP:
514 dev_priv->vbt.edp_bpp = 24;
515 break;
516 case EDP_30BPP:
517 dev_priv->vbt.edp_bpp = 30;
518 break;
519 }
520
521 /* Get the eDP sequencing and link info */
522 edp_pps = &edp->power_seqs[panel_type];
523 edp_link_params = &edp->link_params[panel_type];
524
525 dev_priv->vbt.edp_pps = *edp_pps;
526
527 dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
528 DP_LINK_BW_1_62;
529 switch (edp_link_params->lanes) {
530 case 0:
531 dev_priv->vbt.edp_lanes = 1;
532 break;
533 case 1:
534 dev_priv->vbt.edp_lanes = 2;
535 break;
536 case 3:
537 default:
538 dev_priv->vbt.edp_lanes = 4;
539 break;
540 }
541 switch (edp_link_params->preemphasis) {
542 case 0:
543 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
544 break;
545 case 1:
546 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
547 break;
548 case 2:
549 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
550 break;
551 case 3:
552 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
553 break;
554 }
555 switch (edp_link_params->vswing) {
556 case 0:
557 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
558 break;
559 case 1:
560 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
561 break;
562 case 2:
563 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
564 break;
565 case 3:
566 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
567 break;
568 }
569 }
570
571 static void
572 parse_device_mapping(struct drm_i915_private *dev_priv,
573 struct bdb_header *bdb)
574 {
575 struct bdb_general_definitions *p_defs;
576 struct child_device_config *p_child, *child_dev_ptr;
577 int i, child_device_num, count;
578 u16 block_size;
579
580 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
581 if (!p_defs) {
582 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
583 return;
584 }
585 /* judge whether the size of child device meets the requirements.
586 * If the child device size obtained from general definition block
587 * is different with sizeof(struct child_device_config), skip the
588 * parsing of sdvo device info
589 */
590 if (p_defs->child_dev_size != sizeof(*p_child)) {
591 /* different child dev size . Ignore it */
592 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
593 return;
594 }
595 /* get the block size of general definitions */
596 block_size = get_blocksize(p_defs);
597 /* get the number of child device */
598 child_device_num = (block_size - sizeof(*p_defs)) /
599 sizeof(*p_child);
600 count = 0;
601 /* get the number of child device that is present */
602 for (i = 0; i < child_device_num; i++) {
603 p_child = &(p_defs->devices[i]);
604 if (!p_child->device_type) {
605 /* skip the device block if device type is invalid */
606 continue;
607 }
608 count++;
609 }
610 if (!count) {
611 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
612 return;
613 }
614 dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
615 if (!dev_priv->vbt.child_dev) {
616 DRM_DEBUG_KMS("No memory space for child device\n");
617 return;
618 }
619
620 dev_priv->vbt.child_dev_num = count;
621 count = 0;
622 for (i = 0; i < child_device_num; i++) {
623 p_child = &(p_defs->devices[i]);
624 if (!p_child->device_type) {
625 /* skip the device block if device type is invalid */
626 continue;
627 }
628 child_dev_ptr = dev_priv->vbt.child_dev + count;
629 count++;
630 memcpy((void *)child_dev_ptr, (void *)p_child,
631 sizeof(*p_child));
632 }
633 return;
634 }
635
636 static void
637 init_vbt_defaults(struct drm_i915_private *dev_priv)
638 {
639 struct drm_device *dev = dev_priv->dev;
640
641 dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
642
643 /* LFP panel data */
644 dev_priv->vbt.lvds_dither = 1;
645 dev_priv->vbt.lvds_vbt = 0;
646
647 /* SDVO panel data */
648 dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
649
650 /* general features */
651 dev_priv->vbt.int_tv_support = 1;
652 dev_priv->vbt.int_crt_support = 1;
653
654 /* Default to using SSC */
655 dev_priv->vbt.lvds_use_ssc = 1;
656 dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
657 DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->vbt.lvds_ssc_freq);
658 }
659
660 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
661 {
662 DRM_DEBUG_KMS("Falling back to manually reading VBT from "
663 "VBIOS ROM for %s\n",
664 id->ident);
665 return 1;
666 }
667
668 static const struct dmi_system_id intel_no_opregion_vbt[] = {
669 {
670 .callback = intel_no_opregion_vbt_callback,
671 .ident = "ThinkCentre A57",
672 .matches = {
673 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
674 DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
675 },
676 },
677 { }
678 };
679
680 /**
681 * intel_parse_bios - find VBT and initialize settings from the BIOS
682 * @dev: DRM device
683 *
684 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
685 * to appropriate values.
686 *
687 * Returns 0 on success, nonzero on failure.
688 */
689 int
690 intel_parse_bios(struct drm_device *dev)
691 {
692 struct drm_i915_private *dev_priv = dev->dev_private;
693 struct pci_dev *pdev = dev->pdev;
694 struct bdb_header *bdb = NULL;
695 u8 __iomem *bios = NULL;
696
697 if (HAS_PCH_NOP(dev))
698 return -ENODEV;
699
700 init_vbt_defaults(dev_priv);
701
702 /* XXX Should this validation be moved to intel_opregion.c? */
703 if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
704 struct vbt_header *vbt = dev_priv->opregion.vbt;
705 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
706 DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
707 vbt->signature);
708 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
709 } else
710 dev_priv->opregion.vbt = NULL;
711 }
712
713 if (bdb == NULL) {
714 struct vbt_header *vbt = NULL;
715 size_t size;
716 int i;
717
718 bios = pci_map_rom(pdev, &size);
719 if (!bios)
720 return -1;
721
722 /* Scour memory looking for the VBT signature */
723 for (i = 0; i + 4 < size; i++) {
724 if (!memcmp(bios + i, "$VBT", 4)) {
725 vbt = (struct vbt_header *)(bios + i);
726 break;
727 }
728 }
729
730 if (!vbt) {
731 DRM_DEBUG_DRIVER("VBT signature missing\n");
732 pci_unmap_rom(pdev, bios);
733 return -1;
734 }
735
736 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
737 }
738
739 /* Grab useful general definitions */
740 parse_general_features(dev_priv, bdb);
741 parse_general_definitions(dev_priv, bdb);
742 parse_lfp_panel_data(dev_priv, bdb);
743 parse_sdvo_panel_data(dev_priv, bdb);
744 parse_sdvo_device_mapping(dev_priv, bdb);
745 parse_device_mapping(dev_priv, bdb);
746 parse_driver_features(dev_priv, bdb);
747 parse_edp(dev_priv, bdb);
748
749 if (bios)
750 pci_unmap_rom(pdev, bios);
751
752 return 0;
753 }
754
755 /* Ensure that vital registers have been initialised, even if the BIOS
756 * is absent or just failing to do its job.
757 */
758 void intel_setup_bios(struct drm_device *dev)
759 {
760 struct drm_i915_private *dev_priv = dev->dev_private;
761
762 /* Set the Panel Power On/Off timings if uninitialized. */
763 if (!HAS_PCH_SPLIT(dev) &&
764 I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
765 /* Set T2 to 40ms and T5 to 200ms */
766 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
767
768 /* Set T3 to 35ms and Tx to 200ms */
769 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
770 }
771 }
Linux with added FPC-III support