intel_bios.c

  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#include <drm/drm_print.h>
 12
 13#include "intel_bios.h"
 14#include "psb_drv.h"
 15#include "psb_intel_drv.h"
 16#include "psb_intel_reg.h"
 17
 18#define	TARGET_ADDR1	0x70
 19#define	TARGET_ADDR2	0x72
 20
 21static void *find_section(struct bdb_header *bdb, int section_id)
 22{
 23	u8 *base = (u8 *)bdb;
 24	int index = 0;
 25	u16 total, current_size;
 26	u8 current_id;
 27
 28	/* skip to first section */
 29	index += bdb->header_size;
 30	total = bdb->bdb_size;
 31
 32	/* walk the sections looking for section_id */
 33	while (index < total) {
 34		current_id = *(base + index);
 35		index++;
 36		current_size = *((u16 *)(base + index));
 37		index += 2;
 38		if (current_id == section_id)
 39			return base + index;
 40		index += current_size;
 41	}
 42
 43	return NULL;
 44}
 45
 46static void
 47parse_edp(struct drm_psb_private *dev_priv, struct bdb_header *bdb)
 48{
 49	struct bdb_edp *edp;
 50	struct edp_power_seq *edp_pps;
 51	struct edp_link_params *edp_link_params;
 52	uint8_t	panel_type;
 53
 54	edp = find_section(bdb, BDB_EDP);
 55
 56	dev_priv->edp.bpp = 18;
 57	if (!edp) {
 58		if (dev_priv->edp.support) {
 59			DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported, assume %dbpp panel color depth.\n",
 60				      dev_priv->edp.bpp);
 61		}
 62		return;
 63	}
 64
 65	panel_type = dev_priv->panel_type;
 66	switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 67	case EDP_18BPP:
 68		dev_priv->edp.bpp = 18;
 69		break;
 70	case EDP_24BPP:
 71		dev_priv->edp.bpp = 24;
 72		break;
 73	case EDP_30BPP:
 74		dev_priv->edp.bpp = 30;
 75		break;
 76	}
 77
 78	/* Get the eDP sequencing and link info */
 79	edp_pps = &edp->power_seqs[panel_type];
 80	edp_link_params = &edp->link_params[panel_type];
 81
 82	dev_priv->edp.pps = *edp_pps;
 83
 84	DRM_DEBUG_KMS("EDP timing in vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
 85				dev_priv->edp.pps.t1_t3, dev_priv->edp.pps.t8,
 86				dev_priv->edp.pps.t9, dev_priv->edp.pps.t10,
 87				dev_priv->edp.pps.t11_t12);
 88
 89	dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 90		DP_LINK_BW_1_62;
 91	switch (edp_link_params->lanes) {
 92	case 0:
 93		dev_priv->edp.lanes = 1;
 94		break;
 95	case 1:
 96		dev_priv->edp.lanes = 2;
 97		break;
 98	case 3:
 99	default:
100		dev_priv->edp.lanes = 4;
101		break;
102	}
103	DRM_DEBUG_KMS("VBT reports EDP: Lane_count %d, Lane_rate %d, Bpp %d\n",
104			dev_priv->edp.lanes, dev_priv->edp.rate, dev_priv->edp.bpp);
105
106	switch (edp_link_params->preemphasis) {
107	case 0:
108		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
109		break;
110	case 1:
111		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
112		break;
113	case 2:
114		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
115		break;
116	case 3:
117		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
118		break;
119	}
120	switch (edp_link_params->vswing) {
121	case 0:
122		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
123		break;
124	case 1:
125		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
126		break;
127	case 2:
128		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
129		break;
130	case 3:
131		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
132		break;
133	}
134	DRM_DEBUG_KMS("VBT reports EDP: VSwing  %d, Preemph %d\n",
135			dev_priv->edp.vswing, dev_priv->edp.preemphasis);
136}
137
138static u16
139get_blocksize(void *p)
140{
141	u16 *block_ptr, block_size;
142
143	block_ptr = (u16 *)((char *)p - 2);
144	block_size = *block_ptr;
145	return block_size;
146}
147
148static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
149			struct lvds_dvo_timing *dvo_timing)
150{
151	panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
152		dvo_timing->hactive_lo;
153	panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
154		((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
155	panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
156		dvo_timing->hsync_pulse_width;
157	panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
158		((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
159
160	panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
161		dvo_timing->vactive_lo;
162	panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
163		dvo_timing->vsync_off;
164	panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
165		dvo_timing->vsync_pulse_width;
166	panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
167		((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
168	panel_fixed_mode->clock = dvo_timing->clock * 10;
169	panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
170
171	if (dvo_timing->hsync_positive)
172		panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
173	else
174		panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
175
176	if (dvo_timing->vsync_positive)
177		panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
178	else
179		panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
180
181	/* Some VBTs have bogus h/vtotal values */
182	if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
183		panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
184	if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
185		panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
186
187	drm_mode_set_name(panel_fixed_mode);
188}
189
190static void parse_backlight_data(struct drm_psb_private *dev_priv,
191				struct bdb_header *bdb)
192{
193	struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
194	struct bdb_lvds_backlight *lvds_bl;
195	u8 p_type = 0;
196	void *bl_start = NULL;
197	struct bdb_lvds_options *lvds_opts
198				= find_section(bdb, BDB_LVDS_OPTIONS);
199
200	dev_priv->lvds_bl = NULL;
201
202	if (lvds_opts)
203		p_type = lvds_opts->panel_type;
204	else
205		return;
206
207	bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
208	vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
209
210	lvds_bl = kmemdup(vbt_lvds_bl, sizeof(*vbt_lvds_bl), GFP_KERNEL);
211	if (!lvds_bl) {
212		dev_err(dev_priv->dev.dev, "out of memory for backlight data\n");
213		return;
214	}
215	dev_priv->lvds_bl = lvds_bl;
216}
217
218/* Try to find integrated panel data */
219static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
220			    struct bdb_header *bdb)
221{
222	struct bdb_lvds_options *lvds_options;
223	struct bdb_lvds_lfp_data *lvds_lfp_data;
224	struct bdb_lvds_lfp_data_entry *entry;
225	struct lvds_dvo_timing *dvo_timing;
226	struct drm_display_mode *panel_fixed_mode;
227
228	/* Defaults if we can't find VBT info */
229	dev_priv->lvds_dither = 0;
230	dev_priv->lvds_vbt = 0;
231
232	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
233	if (!lvds_options)
234		return;
235
236	dev_priv->lvds_dither = lvds_options->pixel_dither;
237	dev_priv->panel_type = lvds_options->panel_type;
238
239	if (lvds_options->panel_type == 0xff)
240		return;
241
242	lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
243	if (!lvds_lfp_data)
244		return;
245
246
247	entry = &lvds_lfp_data->data[lvds_options->panel_type];
248	dvo_timing = &entry->dvo_timing;
249
250	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
251				      GFP_KERNEL);
252	if (panel_fixed_mode == NULL) {
253		dev_err(dev_priv->dev.dev, "out of memory for fixed panel mode\n");
254		return;
255	}
256
257	dev_priv->lvds_vbt = 1;
258	fill_detail_timing_data(panel_fixed_mode, dvo_timing);
259
260	if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
261		dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
262		drm_mode_debug_printmodeline(panel_fixed_mode);
263	} else {
264		dev_dbg(dev_priv->dev.dev, "ignoring invalid LVDS VBT\n");
265		dev_priv->lvds_vbt = 0;
266		kfree(panel_fixed_mode);
267	}
268	return;
269}
270
271/* Try to find sdvo panel data */
272static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
273		      struct bdb_header *bdb)
274{
275	struct bdb_sdvo_lvds_options *sdvo_lvds_options;
276	struct lvds_dvo_timing *dvo_timing;
277	struct drm_display_mode *panel_fixed_mode;
278
279	dev_priv->sdvo_lvds_vbt_mode = NULL;
280
281	sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
282	if (!sdvo_lvds_options)
283		return;
284
285	dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
286	if (!dvo_timing)
287		return;
288
289	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
290
291	if (!panel_fixed_mode)
292		return;
293
294	fill_detail_timing_data(panel_fixed_mode,
295			dvo_timing + sdvo_lvds_options->panel_type);
296
297	dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
298
299	return;
300}
301
302static void parse_general_features(struct drm_psb_private *dev_priv,
303		       struct bdb_header *bdb)
304{
305	struct bdb_general_features *general;
306
307	/* Set sensible defaults in case we can't find the general block */
308	dev_priv->int_tv_support = 1;
309	dev_priv->int_crt_support = 1;
310
311	general = find_section(bdb, BDB_GENERAL_FEATURES);
312	if (general) {
313		dev_priv->int_tv_support = general->int_tv_support;
314		dev_priv->int_crt_support = general->int_crt_support;
315		dev_priv->lvds_use_ssc = general->enable_ssc;
316
317		if (dev_priv->lvds_use_ssc) {
318			dev_priv->lvds_ssc_freq
319				= general->ssc_freq ? 100 : 96;
320		}
321	}
322}
323
324static void
325parse_sdvo_device_mapping(struct drm_psb_private *dev_priv,
326			  struct bdb_header *bdb)
327{
328	struct sdvo_device_mapping *p_mapping;
329	struct bdb_general_definitions *p_defs;
330	struct child_device_config *p_child;
331	int i, child_device_num, count;
332	u16	block_size;
333
334	p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
335	if (!p_defs) {
336		DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
337		return;
338	}
339	/* judge whether the size of child device meets the requirements.
340	 * If the child device size obtained from general definition block
341	 * is different with sizeof(struct child_device_config), skip the
342	 * parsing of sdvo device info
343	 */
344	if (p_defs->child_dev_size != sizeof(*p_child)) {
345		/* different child dev size . Ignore it */
346		DRM_DEBUG_KMS("different child size is found. Invalid.\n");
347		return;
348	}
349	/* get the block size of general definitions */
350	block_size = get_blocksize(p_defs);
351	/* get the number of child device */
352	child_device_num = (block_size - sizeof(*p_defs)) /
353				sizeof(*p_child);
354	count = 0;
355	for (i = 0; i < child_device_num; i++) {
356		p_child = &(p_defs->devices[i]);
357		if (!p_child->device_type) {
358			/* skip the device block if device type is invalid */
359			continue;
360		}
361		if (p_child->target_addr != TARGET_ADDR1 &&
362			p_child->target_addr != TARGET_ADDR2) {
363			/*
364			 * If the target address is neither 0x70 nor 0x72,
365			 * it is not a SDVO device. Skip it.
366			 */
367			continue;
368		}
369		if (p_child->dvo_port != DEVICE_PORT_DVOB &&
370			p_child->dvo_port != DEVICE_PORT_DVOC) {
371			/* skip the incorrect SDVO port */
372			DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
373			continue;
374		}
375		DRM_DEBUG_KMS("the SDVO device with target addr %2x is found on"
376				" %s port\n",
377				p_child->target_addr,
378				(p_child->dvo_port == DEVICE_PORT_DVOB) ?
379					"SDVOB" : "SDVOC");
380		p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
381		if (!p_mapping->initialized) {
382			p_mapping->dvo_port = p_child->dvo_port;
383			p_mapping->target_addr = p_child->target_addr;
384			p_mapping->dvo_wiring = p_child->dvo_wiring;
385			p_mapping->ddc_pin = p_child->ddc_pin;
386			p_mapping->i2c_pin = p_child->i2c_pin;
387			p_mapping->initialized = 1;
388			DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
389				      p_mapping->dvo_port,
390				      p_mapping->target_addr,
391				      p_mapping->dvo_wiring,
392				      p_mapping->ddc_pin,
393				      p_mapping->i2c_pin);
394		} else {
395			DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
396					 "two SDVO device.\n");
397		}
398		if (p_child->target2_addr) {
399			/* Maybe this is a SDVO device with multiple inputs */
400			/* And the mapping info is not added */
401			DRM_DEBUG_KMS("there exists the target2_addr. Maybe this"
402				" is a SDVO device with multiple inputs.\n");
403		}
404		count++;
405	}
406
407	if (!count) {
408		/* No SDVO device info is found */
409		DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
410	}
411	return;
412}
413
414
415static void
416parse_driver_features(struct drm_psb_private *dev_priv,
417		      struct bdb_header *bdb)
418{
419	struct bdb_driver_features *driver;
420
421	driver = find_section(bdb, BDB_DRIVER_FEATURES);
422	if (!driver)
423		return;
424
425	if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
426		dev_priv->edp.support = 1;
427
428	dev_priv->lvds_enabled_in_vbt = driver->lvds_config != 0;
429	DRM_DEBUG_KMS("LVDS VBT config bits: 0x%x\n", driver->lvds_config);
430
431	/* This bit means to use 96Mhz for DPLL_A or not */
432	if (driver->primary_lfp_id)
433		dev_priv->dplla_96mhz = true;
434	else
435		dev_priv->dplla_96mhz = false;
436}
437
438static void
439parse_device_mapping(struct drm_psb_private *dev_priv,
440		       struct bdb_header *bdb)
441{
442	struct bdb_general_definitions *p_defs;
443	struct child_device_config *p_child, *child_dev_ptr;
444	int i, child_device_num, count;
445	u16	block_size;
446
447	p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
448	if (!p_defs) {
449		DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
450		return;
451	}
452	/* judge whether the size of child device meets the requirements.
453	 * If the child device size obtained from general definition block
454	 * is different with sizeof(struct child_device_config), skip the
455	 * parsing of sdvo device info
456	 */
457	if (p_defs->child_dev_size != sizeof(*p_child)) {
458		/* different child dev size . Ignore it */
459		DRM_DEBUG_KMS("different child size is found. Invalid.\n");
460		return;
461	}
462	/* get the block size of general definitions */
463	block_size = get_blocksize(p_defs);
464	/* get the number of child device */
465	child_device_num = (block_size - sizeof(*p_defs)) /
466				sizeof(*p_child);
467	count = 0;
468	/* get the number of child devices that are present */
469	for (i = 0; i < child_device_num; i++) {
470		p_child = &(p_defs->devices[i]);
471		if (!p_child->device_type) {
472			/* skip the device block if device type is invalid */
473			continue;
474		}
475		count++;
476	}
477	if (!count) {
478		DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
479		return;
480	}
481	dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
482	if (!dev_priv->child_dev) {
483		DRM_DEBUG_KMS("No memory space for child devices\n");
484		return;
485	}
486
487	dev_priv->child_dev_num = count;
488	count = 0;
489	for (i = 0; i < child_device_num; i++) {
490		p_child = &(p_defs->devices[i]);
491		if (!p_child->device_type) {
492			/* skip the device block if device type is invalid */
493			continue;
494		}
495		child_dev_ptr = dev_priv->child_dev + count;
496		count++;
497		memcpy((void *)child_dev_ptr, (void *)p_child,
498					sizeof(*p_child));
499	}
500	return;
501}
502
503
504/**
505 * psb_intel_init_bios - initialize VBIOS settings & find VBT
506 * @dev: DRM device
507 *
508 * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
509 * to appropriate values.
510 *
511 * VBT existence is a sanity check that is relied on by other i830_bios.c code.
512 * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
513 * feed an updated VBT back through that, compared to what we'll fetch using
514 * this method of groping around in the BIOS data.
515 *
516 * Returns 0 on success, nonzero on failure.
517 */
518int psb_intel_init_bios(struct drm_device *dev)
519{
520	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
521	struct pci_dev *pdev = to_pci_dev(dev->dev);
522	struct vbt_header *vbt = NULL;
523	struct bdb_header *bdb = NULL;
524	u8 __iomem *bios = NULL;
525	size_t size;
526	int i;
527
528
529	dev_priv->panel_type = 0xff;
530
531	/* XXX Should this validation be moved to intel_opregion.c? */
532	if (dev_priv->opregion.vbt) {
533		struct vbt_header *vbt = dev_priv->opregion.vbt;
534		if (memcmp(vbt->signature, "$VBT", 4) == 0) {
535			DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
536					 vbt->signature);
537			bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
538		} else
539			dev_priv->opregion.vbt = NULL;
540	}
541
542	if (bdb == NULL) {
543		bios = pci_map_rom(pdev, &size);
544		if (!bios)
545			return -1;
546
547		/* Scour memory looking for the VBT signature */
548		for (i = 0; i + 4 < size; i++) {
549			if (!memcmp(bios + i, "$VBT", 4)) {
550				vbt = (struct vbt_header *)(bios + i);
551				break;
552			}
553		}
554
555		if (!vbt) {
556			dev_err(dev->dev, "VBT signature missing\n");
557			pci_unmap_rom(pdev, bios);
558			return -1;
559		}
560		bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
561	}
562
563	/* Grab useful general dxefinitions */
564	parse_general_features(dev_priv, bdb);
565	parse_driver_features(dev_priv, bdb);
566	parse_lfp_panel_data(dev_priv, bdb);
567	parse_sdvo_panel_data(dev_priv, bdb);
568	parse_sdvo_device_mapping(dev_priv, bdb);
569	parse_device_mapping(dev_priv, bdb);
570	parse_backlight_data(dev_priv, bdb);
571	parse_edp(dev_priv, bdb);
572
573	if (bios)
574		pci_unmap_rom(pdev, bios);
575
576	return 0;
577}
578
579/*
580 * Destroy and free VBT data
581 */
582void psb_intel_destroy_bios(struct drm_device *dev)
583{
584	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
585
586	kfree(dev_priv->sdvo_lvds_vbt_mode);
587	kfree(dev_priv->lfp_lvds_vbt_mode);
588	kfree(dev_priv->lvds_bl);
589}