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