1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2006 Intel Corporation
4 *
5 * Authors:
6 * Eric Anholt <eric@anholt.net>
7 */
8
9#include <drm/display/drm_dp_helper.h>
10#include <drm/drm.h>
11
12#include "intel_bios.h"
13#include "psb_drv.h"
14#include "psb_intel_drv.h"
15#include "psb_intel_reg.h"
16
17#define SLAVE_ADDR1 0x70
18#define SLAVE_ADDR2 0x72
19
20static void *find_section(struct bdb_header *bdb, int section_id)
21{
22 u8 *base = (u8 *)bdb;
23 int index = 0;
24 u16 total, current_size;
25 u8 current_id;
26
27 /* skip to first section */
28 index += bdb->header_size;
29 total = bdb->bdb_size;
30
31 /* walk the sections looking for section_id */
32 while (index < total) {
33 current_id = *(base + index);
34 index++;
35 current_size = *((u16 *)(base + index));
36 index += 2;
37 if (current_id == section_id)
38 return base + index;
39 index += current_size;
40 }
41
42 return NULL;
43}
44
45static void
46parse_edp(struct drm_psb_private *dev_priv, struct bdb_header *bdb)
47{
48 struct bdb_edp *edp;
49 struct edp_power_seq *edp_pps;
50 struct edp_link_params *edp_link_params;
51 uint8_t panel_type;
52
53 edp = find_section(bdb, BDB_EDP);
54
55 dev_priv->edp.bpp = 18;
56 if (!edp) {
57 if (dev_priv->edp.support) {
58 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported, assume %dbpp panel color depth.\n",
59 dev_priv->edp.bpp);
60 }
61 return;
62 }
63
64 panel_type = dev_priv->panel_type;
65 switch ((edp->color_depth >> (panel_type * 2)) & 3) {
66 case EDP_18BPP:
67 dev_priv->edp.bpp = 18;
68 break;
69 case EDP_24BPP:
70 dev_priv->edp.bpp = 24;
71 break;
72 case EDP_30BPP:
73 dev_priv->edp.bpp = 30;
74 break;
75 }
76
77 /* Get the eDP sequencing and link info */
78 edp_pps = &edp->power_seqs[panel_type];
79 edp_link_params = &edp->link_params[panel_type];
80
81 dev_priv->edp.pps = *edp_pps;
82
83 DRM_DEBUG_KMS("EDP timing in vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
84 dev_priv->edp.pps.t1_t3, dev_priv->edp.pps.t8,
85 dev_priv->edp.pps.t9, dev_priv->edp.pps.t10,
86 dev_priv->edp.pps.t11_t12);
87
88 dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
89 DP_LINK_BW_1_62;
90 switch (edp_link_params->lanes) {
91 case 0:
92 dev_priv->edp.lanes = 1;
93 break;
94 case 1:
95 dev_priv->edp.lanes = 2;
96 break;
97 case 3:
98 default:
99 dev_priv->edp.lanes = 4;
100 break;
101 }
102 DRM_DEBUG_KMS("VBT reports EDP: Lane_count %d, Lane_rate %d, Bpp %d\n",
103 dev_priv->edp.lanes, dev_priv->edp.rate, dev_priv->edp.bpp);
104
105 switch (edp_link_params->preemphasis) {
106 case 0:
107 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
108 break;
109 case 1:
110 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
111 break;
112 case 2:
113 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
114 break;
115 case 3:
116 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
117 break;
118 }
119 switch (edp_link_params->vswing) {
120 case 0:
121 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
122 break;
123 case 1:
124 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
125 break;
126 case 2:
127 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
128 break;
129 case 3:
130 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
131 break;
132 }
133 DRM_DEBUG_KMS("VBT reports EDP: VSwing %d, Preemph %d\n",
134 dev_priv->edp.vswing, dev_priv->edp.preemphasis);
135}
136
137static u16
138get_blocksize(void *p)
139{
140 u16 *block_ptr, block_size;
141
142 block_ptr = (u16 *)((char *)p - 2);
143 block_size = *block_ptr;
144 return block_size;
145}
146
147static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
148 struct lvds_dvo_timing *dvo_timing)
149{
150 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
151 dvo_timing->hactive_lo;
152 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
153 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
154 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
155 dvo_timing->hsync_pulse_width;
156 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
157 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
158
159 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
160 dvo_timing->vactive_lo;
161 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
162 dvo_timing->vsync_off;
163 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
164 dvo_timing->vsync_pulse_width;
165 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
166 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
167 panel_fixed_mode->clock = dvo_timing->clock * 10;
168 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
169
170 if (dvo_timing->hsync_positive)
171 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
172 else
173 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
174
175 if (dvo_timing->vsync_positive)
176 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
177 else
178 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
179
180 /* Some VBTs have bogus h/vtotal values */
181 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
182 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
183 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
184 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
185
186 drm_mode_set_name(mode: panel_fixed_mode);
187}
188
189static void parse_backlight_data(struct drm_psb_private *dev_priv,
190 struct bdb_header *bdb)
191{
192 struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
193 struct bdb_lvds_backlight *lvds_bl;
194 u8 p_type = 0;
195 void *bl_start = NULL;
196 struct bdb_lvds_options *lvds_opts
197 = find_section(bdb, BDB_LVDS_OPTIONS);
198
199 dev_priv->lvds_bl = NULL;
200
201 if (lvds_opts)
202 p_type = lvds_opts->panel_type;
203 else
204 return;
205
206 bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
207 vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
208
209 lvds_bl = kmemdup(p: vbt_lvds_bl, size: sizeof(*vbt_lvds_bl), GFP_KERNEL);
210 if (!lvds_bl) {
211 dev_err(dev_priv->dev.dev, "out of memory for backlight data\n");
212 return;
213 }
214 dev_priv->lvds_bl = lvds_bl;
215}
216
217/* Try to find integrated panel data */
218static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
219 struct bdb_header *bdb)
220{
221 struct bdb_lvds_options *lvds_options;
222 struct bdb_lvds_lfp_data *lvds_lfp_data;
223 struct bdb_lvds_lfp_data_entry *entry;
224 struct lvds_dvo_timing *dvo_timing;
225 struct drm_display_mode *panel_fixed_mode;
226
227 /* Defaults if we can't find VBT info */
228 dev_priv->lvds_dither = 0;
229 dev_priv->lvds_vbt = 0;
230
231 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
232 if (!lvds_options)
233 return;
234
235 dev_priv->lvds_dither = lvds_options->pixel_dither;
236 dev_priv->panel_type = lvds_options->panel_type;
237
238 if (lvds_options->panel_type == 0xff)
239 return;
240
241 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
242 if (!lvds_lfp_data)
243 return;
244
245
246 entry = &lvds_lfp_data->data[lvds_options->panel_type];
247 dvo_timing = &entry->dvo_timing;
248
249 panel_fixed_mode = kzalloc(size: sizeof(*panel_fixed_mode),
250 GFP_KERNEL);
251 if (panel_fixed_mode == NULL) {
252 dev_err(dev_priv->dev.dev, "out of memory for fixed panel mode\n");
253 return;
254 }
255
256 dev_priv->lvds_vbt = 1;
257 fill_detail_timing_data(panel_fixed_mode, dvo_timing);
258
259 if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
260 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
261 drm_mode_debug_printmodeline(mode: panel_fixed_mode);
262 } else {
263 dev_dbg(dev_priv->dev.dev, "ignoring invalid LVDS VBT\n");
264 dev_priv->lvds_vbt = 0;
265 kfree(objp: panel_fixed_mode);
266 }
267 return;
268}
269
270/* Try to find sdvo panel data */
271static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
272 struct bdb_header *bdb)
273{
274 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
275 struct lvds_dvo_timing *dvo_timing;
276 struct drm_display_mode *panel_fixed_mode;
277
278 dev_priv->sdvo_lvds_vbt_mode = NULL;
279
280 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
281 if (!sdvo_lvds_options)
282 return;
283
284 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
285 if (!dvo_timing)
286 return;
287
288 panel_fixed_mode = kzalloc(size: sizeof(*panel_fixed_mode), GFP_KERNEL);
289
290 if (!panel_fixed_mode)
291 return;
292
293 fill_detail_timing_data(panel_fixed_mode,
294 dvo_timing: dvo_timing + sdvo_lvds_options->panel_type);
295
296 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
297
298 return;
299}
300
301static void parse_general_features(struct drm_psb_private *dev_priv,
302 struct bdb_header *bdb)
303{
304 struct bdb_general_features *general;
305
306 /* Set sensible defaults in case we can't find the general block */
307 dev_priv->int_tv_support = 1;
308 dev_priv->int_crt_support = 1;
309
310 general = find_section(bdb, BDB_GENERAL_FEATURES);
311 if (general) {
312 dev_priv->int_tv_support = general->int_tv_support;
313 dev_priv->int_crt_support = general->int_crt_support;
314 dev_priv->lvds_use_ssc = general->enable_ssc;
315
316 if (dev_priv->lvds_use_ssc) {
317 dev_priv->lvds_ssc_freq
318 = general->ssc_freq ? 100 : 96;
319 }
320 }
321}
322
323static void
324parse_sdvo_device_mapping(struct drm_psb_private *dev_priv,
325 struct bdb_header *bdb)
326{
327 struct sdvo_device_mapping *p_mapping;
328 struct bdb_general_definitions *p_defs;
329 struct child_device_config *p_child;
330 int i, child_device_num, count;
331 u16 block_size;
332
333 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
334 if (!p_defs) {
335 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
336 return;
337 }
338 /* judge whether the size of child device meets the requirements.
339 * If the child device size obtained from general definition block
340 * is different with sizeof(struct child_device_config), skip the
341 * parsing of sdvo device info
342 */
343 if (p_defs->child_dev_size != sizeof(*p_child)) {
344 /* different child dev size . Ignore it */
345 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
346 return;
347 }
348 /* get the block size of general definitions */
349 block_size = get_blocksize(p: p_defs);
350 /* get the number of child device */
351 child_device_num = (block_size - sizeof(*p_defs)) /
352 sizeof(*p_child);
353 count = 0;
354 for (i = 0; i < child_device_num; i++) {
355 p_child = &(p_defs->devices[i]);
356 if (!p_child->device_type) {
357 /* skip the device block if device type is invalid */
358 continue;
359 }
360 if (p_child->slave_addr != SLAVE_ADDR1 &&
361 p_child->slave_addr != SLAVE_ADDR2) {
362 /*
363 * If the slave address is neither 0x70 nor 0x72,
364 * it is not a SDVO device. Skip it.
365 */
366 continue;
367 }
368 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
369 p_child->dvo_port != DEVICE_PORT_DVOC) {
370 /* skip the incorrect SDVO port */
371 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
372 continue;
373 }
374 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
375 " %s port\n",
376 p_child->slave_addr,
377 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
378 "SDVOB" : "SDVOC");
379 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
380 if (!p_mapping->initialized) {
381 p_mapping->dvo_port = p_child->dvo_port;
382 p_mapping->slave_addr = p_child->slave_addr;
383 p_mapping->dvo_wiring = p_child->dvo_wiring;
384 p_mapping->ddc_pin = p_child->ddc_pin;
385 p_mapping->i2c_pin = p_child->i2c_pin;
386 p_mapping->initialized = 1;
387 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
388 p_mapping->dvo_port,
389 p_mapping->slave_addr,
390 p_mapping->dvo_wiring,
391 p_mapping->ddc_pin,
392 p_mapping->i2c_pin);
393 } else {
394 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
395 "two SDVO device.\n");
396 }
397 if (p_child->slave2_addr) {
398 /* Maybe this is a SDVO device with multiple inputs */
399 /* And the mapping info is not added */
400 DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
401 " is a SDVO device with multiple inputs.\n");
402 }
403 count++;
404 }
405
406 if (!count) {
407 /* No SDVO device info is found */
408 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
409 }
410 return;
411}
412
413
414static void
415parse_driver_features(struct drm_psb_private *dev_priv,
416 struct bdb_header *bdb)
417{
418 struct bdb_driver_features *driver;
419
420 driver = find_section(bdb, BDB_DRIVER_FEATURES);
421 if (!driver)
422 return;
423
424 if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
425 dev_priv->edp.support = 1;
426
427 dev_priv->lvds_enabled_in_vbt = driver->lvds_config != 0;
428 DRM_DEBUG_KMS("LVDS VBT config bits: 0x%x\n", driver->lvds_config);
429
430 /* This bit means to use 96Mhz for DPLL_A or not */
431 if (driver->primary_lfp_id)
432 dev_priv->dplla_96mhz = true;
433 else
434 dev_priv->dplla_96mhz = false;
435}
436
437static void
438parse_device_mapping(struct drm_psb_private *dev_priv,
439 struct bdb_header *bdb)
440{
441 struct bdb_general_definitions *p_defs;
442 struct child_device_config *p_child, *child_dev_ptr;
443 int i, child_device_num, count;
444 u16 block_size;
445
446 p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
447 if (!p_defs) {
448 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
449 return;
450 }
451 /* judge whether the size of child device meets the requirements.
452 * If the child device size obtained from general definition block
453 * is different with sizeof(struct child_device_config), skip the
454 * parsing of sdvo device info
455 */
456 if (p_defs->child_dev_size != sizeof(*p_child)) {
457 /* different child dev size . Ignore it */
458 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
459 return;
460 }
461 /* get the block size of general definitions */
462 block_size = get_blocksize(p: p_defs);
463 /* get the number of child device */
464 child_device_num = (block_size - sizeof(*p_defs)) /
465 sizeof(*p_child);
466 count = 0;
467 /* get the number of child devices that are present */
468 for (i = 0; i < child_device_num; i++) {
469 p_child = &(p_defs->devices[i]);
470 if (!p_child->device_type) {
471 /* skip the device block if device type is invalid */
472 continue;
473 }
474 count++;
475 }
476 if (!count) {
477 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
478 return;
479 }
480 dev_priv->child_dev = kcalloc(n: count, size: sizeof(*p_child), GFP_KERNEL);
481 if (!dev_priv->child_dev) {
482 DRM_DEBUG_KMS("No memory space for child devices\n");
483 return;
484 }
485
486 dev_priv->child_dev_num = count;
487 count = 0;
488 for (i = 0; i < child_device_num; i++) {
489 p_child = &(p_defs->devices[i]);
490 if (!p_child->device_type) {
491 /* skip the device block if device type is invalid */
492 continue;
493 }
494 child_dev_ptr = dev_priv->child_dev + count;
495 count++;
496 memcpy((void *)child_dev_ptr, (void *)p_child,
497 sizeof(*p_child));
498 }
499 return;
500}
501
502
503/**
504 * psb_intel_init_bios - initialize VBIOS settings & find VBT
505 * @dev: DRM device
506 *
507 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
508 * to appropriate values.
509 *
510 * VBT existence is a sanity check that is relied on by other i830_bios.c code.
511 * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
512 * feed an updated VBT back through that, compared to what we'll fetch using
513 * this method of groping around in the BIOS data.
514 *
515 * Returns 0 on success, nonzero on failure.
516 */
517int psb_intel_init_bios(struct drm_device *dev)
518{
519 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
520 struct pci_dev *pdev = to_pci_dev(dev->dev);
521 struct vbt_header *vbt = NULL;
522 struct bdb_header *bdb = NULL;
523 u8 __iomem *bios = NULL;
524 size_t size;
525 int i;
526
527
528 dev_priv->panel_type = 0xff;
529
530 /* XXX Should this validation be moved to intel_opregion.c? */
531 if (dev_priv->opregion.vbt) {
532 struct vbt_header *vbt = dev_priv->opregion.vbt;
533 if (memcmp(p: vbt->signature, q: "$VBT", size: 4) == 0) {
534 DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
535 vbt->signature);
536 bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
537 } else
538 dev_priv->opregion.vbt = NULL;
539 }
540
541 if (bdb == NULL) {
542 bios = pci_map_rom(pdev, size: &size);
543 if (!bios)
544 return -1;
545
546 /* Scour memory looking for the VBT signature */
547 for (i = 0; i + 4 < size; i++) {
548 if (!memcmp(p: bios + i, q: "$VBT", size: 4)) {
549 vbt = (struct vbt_header *)(bios + i);
550 break;
551 }
552 }
553
554 if (!vbt) {
555 dev_err(dev->dev, "VBT signature missing\n");
556 pci_unmap_rom(pdev, rom: bios);
557 return -1;
558 }
559 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
560 }
561
562 /* Grab useful general dxefinitions */
563 parse_general_features(dev_priv, bdb);
564 parse_driver_features(dev_priv, bdb);
565 parse_lfp_panel_data(dev_priv, bdb);
566 parse_sdvo_panel_data(dev_priv, bdb);
567 parse_sdvo_device_mapping(dev_priv, bdb);
568 parse_device_mapping(dev_priv, bdb);
569 parse_backlight_data(dev_priv, bdb);
570 parse_edp(dev_priv, bdb);
571
572 if (bios)
573 pci_unmap_rom(pdev, rom: bios);
574
575 return 0;
576}
577
578/*
579 * Destroy and free VBT data
580 */
581void psb_intel_destroy_bios(struct drm_device *dev)
582{
583 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
584
585 kfree(objp: dev_priv->sdvo_lvds_vbt_mode);
586 kfree(objp: dev_priv->lfp_lvds_vbt_mode);
587 kfree(objp: dev_priv->lvds_bl);
588}
589

source code of linux/drivers/gpu/drm/gma500/intel_bios.c