WebSVN – Kolibri OS – Blame – /drivers/video/drm/i915/intel_bios.c

Rev	Author	Line No.	Line
2351	Serge	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
		25	*
		26	*/
6937	serge	27
5097	serge	28	#include
5060	serge	29	#include
3031	serge	30	#include
2351	Serge	31	#include "i915_drv.h"
		32	#include "intel_bios.h"
		33
7144	serge	34	/**
		35	* DOC: Video BIOS Table (VBT)
		36	*
		37	* The Video BIOS Table, or VBT, provides platform and board specific
		38	* configuration information to the driver that is not discoverable or available
		39	* through other means. The configuration is mostly related to display
		40	* hardware. The VBT is available via the ACPI OpRegion or, on older systems, in
		41	* the PCI ROM.
		42	*
		43	* The VBT consists of a VBT Header (defined as &struct vbt_header), a BDB
		44	* Header (&struct bdb_header), and a number of BIOS Data Blocks (BDB) that
		45	* contain the actual configuration information. The VBT Header, and thus the
		46	* VBT, begins with "$VBT" signature. The VBT Header contains the offset of the
		47	* BDB Header. The data blocks are concatenated after the BDB Header. The data
		48	* blocks have a 1-byte Block ID, 2-byte Block Size, and Block Size bytes of
		49	* data. (Block 53, the MIPI Sequence Block is an exception.)
		50	*
		51	* The driver parses the VBT during load. The relevant information is stored in
		52	* driver private data for ease of use, and the actual VBT is not read after
		53	* that.
		54	*/
		55
2351	Serge	56	#define SLAVE_ADDR1 0x70
		57	#define SLAVE_ADDR2 0x72
		58
		59	static int panel_type;
		60
7144	serge	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
6084	serge	77	static const void *
		78	find_section(const void *_bdb, int section_id)
2351	Serge	79	{
6084	serge	80	const struct bdb_header *bdb = _bdb;
		81	const u8 *base = _bdb;
2351	Serge	82	int index = 0;
6084	serge	83	u32 total, current_size;
2351	Serge	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 */
5060	serge	91	while (index + 3 < total) {
2351	Serge	92	current_id = *(base + index);
7144	serge	93	current_size = _get_blocksize(base + index);
		94	index += 3;
5060	serge	95
		96	if (index + current_size > total)
		97	return NULL;
		98
2351	Serge	99	if (current_id == section_id)
		100	return base + index;
5060	serge	101
2351	Serge	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;
		118	panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
		119	((dvo_timing->hblank_hi << 8) \| dvo_timing->hblank_lo);
		120
		121	panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) \|
		122	dvo_timing->vactive_lo;
		123	panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
		124	dvo_timing->vsync_off;
		125	panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
		126	dvo_timing->vsync_pulse_width;
		127	panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
		128	((dvo_timing->vblank_hi << 8) \| dvo_timing->vblank_lo);
		129	panel_fixed_mode->clock = dvo_timing->clock * 10;
		130	panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
		131
		132	if (dvo_timing->hsync_positive)
		133	panel_fixed_mode->flags \|= DRM_MODE_FLAG_PHSYNC;
		134	else
		135	panel_fixed_mode->flags \|= DRM_MODE_FLAG_NHSYNC;
		136
		137	if (dvo_timing->vsync_positive)
		138	panel_fixed_mode->flags \|= DRM_MODE_FLAG_PVSYNC;
		139	else
		140	panel_fixed_mode->flags \|= DRM_MODE_FLAG_NVSYNC;
		141
		142	/* Some VBTs have bogus h/vtotal values */
		143	if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
		144	panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
		145	if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
		146	panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
		147
		148	drm_mode_set_name(panel_fixed_mode);
		149	}
		150
		151	static const struct lvds_dvo_timing *
		152	get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
		153	const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
		154	int index)
		155	{
		156	/*
		157	* the size of fp_timing varies on the different platform.
		158	* So calculate the DVO timing relative offset in LVDS data
		159	* entry to get the DVO timing entry
		160	*/
		161
		162	int lfp_data_size =
		163	lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
		164	lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
		165	int dvo_timing_offset =
		166	lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
		167	lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
		168	char entry = (char )lvds_lfp_data->data + lfp_data_size * index;
		169
		170	return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
		171	}
		172
3031	serge	173	/* get lvds_fp_timing entry
		174	* this function may return NULL if the corresponding entry is invalid
		175	*/
		176	static const struct lvds_fp_timing *
		177	get_lvds_fp_timing(const struct bdb_header *bdb,
		178	const struct bdb_lvds_lfp_data *data,
		179	const struct bdb_lvds_lfp_data_ptrs *ptrs,
		180	int index)
		181	{
		182	size_t data_ofs = (const u8 )data - (const u8 )bdb;
		183	u16 data_size = ((const u16 )data)[-1]; / stored in header */
		184	size_t ofs;
		185
		186	if (index >= ARRAY_SIZE(ptrs->ptr))
		187	return NULL;
		188	ofs = ptrs->ptr[index].fp_timing_offset;
		189	if (ofs < data_ofs \|\|
		190	ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
		191	return NULL;
		192	return (const struct lvds_fp_timing )((const u8 )bdb + ofs);
		193	}
		194
2351	Serge	195	/* Try to find integrated panel data */
		196	static void
		197	parse_lfp_panel_data(struct drm_i915_private *dev_priv,
6084	serge	198	const struct bdb_header *bdb)
2351	Serge	199	{
		200	const struct bdb_lvds_options *lvds_options;
		201	const struct bdb_lvds_lfp_data *lvds_lfp_data;
		202	const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
		203	const struct lvds_dvo_timing *panel_dvo_timing;
3031	serge	204	const struct lvds_fp_timing *fp_timing;
2351	Serge	205	struct drm_display_mode *panel_fixed_mode;
6084	serge	206	int drrs_mode;
2351	Serge	207
		208	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
		209	if (!lvds_options)
		210	return;
		211
4104	Serge	212	dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
2351	Serge	213	if (lvds_options->panel_type == 0xff)
		214	return;
		215
		216	panel_type = lvds_options->panel_type;
		217
5060	serge	218	drrs_mode = (lvds_options->dps_panel_type_bits
		219	>> (panel_type * 2)) & MODE_MASK;
		220	/*
		221	* VBT has static DRRS = 0 and seamless DRRS = 2.
		222	* The below piece of code is required to adjust vbt.drrs_type
		223	* to match the enum drrs_support_type.
		224	*/
		225	switch (drrs_mode) {
		226	case 0:
		227	dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
		228	DRM_DEBUG_KMS("DRRS supported mode is static\n");
		229	break;
		230	case 2:
		231	dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
		232	DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
		233	break;
		234	default:
		235	dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
		236	DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
		237	break;
		238	}
		239
2351	Serge	240	lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
		241	if (!lvds_lfp_data)
		242	return;
		243
		244	lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
		245	if (!lvds_lfp_data_ptrs)
		246	return;
		247
4104	Serge	248	dev_priv->vbt.lvds_vbt = 1;
2351	Serge	249
		250	panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
		251	lvds_lfp_data_ptrs,
		252	lvds_options->panel_type);
		253
		254	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
		255	if (!panel_fixed_mode)
		256	return;
		257
		258	fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
		259
4104	Serge	260	dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
2351	Serge	261
		262	DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
		263	drm_mode_debug_printmodeline(panel_fixed_mode);
		264
3031	serge	265	fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
		266	lvds_lfp_data_ptrs,
		267	lvds_options->panel_type);
		268	if (fp_timing) {
		269	/* check the resolution, just to be sure */
		270	if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
		271	fp_timing->y_res == panel_fixed_mode->vdisplay) {
4104	Serge	272	dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
3031	serge	273	DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
4104	Serge	274	dev_priv->vbt.bios_lvds_val);
3031	serge	275	}
		276	}
2351	Serge	277	}
		278
4560	Serge	279	static void
6084	serge	280	parse_lfp_backlight(struct drm_i915_private *dev_priv,
		281	const struct bdb_header *bdb)
4560	Serge	282	{
		283	const struct bdb_lfp_backlight_data *backlight_data;
		284	const struct bdb_lfp_backlight_data_entry *entry;
		285
		286	backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
		287	if (!backlight_data)
		288	return;
		289
		290	if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
		291	DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
		292	backlight_data->entry_size);
		293	return;
		294	}
		295
		296	entry = &backlight_data->data[panel_type];
		297
5060	serge	298	dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
		299	if (!dev_priv->vbt.backlight.present) {
		300	DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
		301	entry->type);
		302	return;
		303	}
		304
4560	Serge	305	dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
		306	dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
5060	serge	307	dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
4560	Serge	308	DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
		309	"active %s, min brightness %u, level %u\n",
		310	dev_priv->vbt.backlight.pwm_freq_hz,
		311	dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
5060	serge	312	dev_priv->vbt.backlight.min_brightness,
4560	Serge	313	backlight_data->level[panel_type]);
		314	}
		315
2351	Serge	316	/* Try to find sdvo panel data */
		317	static void
		318	parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
6084	serge	319	const struct bdb_header *bdb)
2351	Serge	320	{
6084	serge	321	const struct lvds_dvo_timing *dvo_timing;
2351	Serge	322	struct drm_display_mode *panel_fixed_mode;
		323	int index;
		324
5060	serge	325	index = i915.vbt_sdvo_panel_type;
3031	serge	326	if (index == -2) {
		327	DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
		328	return;
		329	}
		330
2351	Serge	331	if (index == -1) {
6084	serge	332	const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
2351	Serge	333
		334	sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
		335	if (!sdvo_lvds_options)
		336	return;
		337
		338	index = sdvo_lvds_options->panel_type;
		339	}
		340
		341	dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
		342	if (!dvo_timing)
		343	return;
		344
		345	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
		346	if (!panel_fixed_mode)
		347	return;
		348
		349	fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
		350
4104	Serge	351	dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
2351	Serge	352
		353	DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
		354	drm_mode_debug_printmodeline(panel_fixed_mode);
		355	}
		356
6937	serge	357	static int intel_bios_ssc_frequency(struct drm_i915_private *dev_priv,
2351	Serge	358	bool alternate)
		359	{
6937	serge	360	switch (INTEL_INFO(dev_priv)->gen) {
2351	Serge	361	case 2:
4560	Serge	362	return alternate ? 66667 : 48000;
2351	Serge	363	case 3:
		364	case 4:
4560	Serge	365	return alternate ? 100000 : 96000;
2351	Serge	366	default:
4560	Serge	367	return alternate ? 100000 : 120000;
2351	Serge	368	}
		369	}
		370
		371	static void
		372	parse_general_features(struct drm_i915_private *dev_priv,
6084	serge	373	const struct bdb_header *bdb)
2351	Serge	374	{
6084	serge	375	const struct bdb_general_features *general;
2351	Serge	376
		377	general = find_section(bdb, BDB_GENERAL_FEATURES);
6937	serge	378	if (!general)
		379	return;
		380
7144	serge	381	dev_priv->vbt.int_tv_support = general->int_tv_support;
6937	serge	382	/* int_crt_support can't be trusted on earlier platforms */
		383	if (bdb->version >= 155 &&
		384	(HAS_DDI(dev_priv) \|\| IS_VALLEYVIEW(dev_priv)))
4104	Serge	385	dev_priv->vbt.int_crt_support = general->int_crt_support;
7144	serge	386	dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
		387	dev_priv->vbt.lvds_ssc_freq =
6937	serge	388	intel_bios_ssc_frequency(dev_priv, general->ssc_freq);
7144	serge	389	dev_priv->vbt.display_clock_mode = general->display_clock_mode;
		390	dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
		391	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",
		392	dev_priv->vbt.int_tv_support,
		393	dev_priv->vbt.int_crt_support,
		394	dev_priv->vbt.lvds_use_ssc,
		395	dev_priv->vbt.lvds_ssc_freq,
		396	dev_priv->vbt.display_clock_mode,
		397	dev_priv->vbt.fdi_rx_polarity_inverted);
		398	}
2351	Serge	399
		400	static void
		401	parse_general_definitions(struct drm_i915_private *dev_priv,
6084	serge	402	const struct bdb_header *bdb)
2351	Serge	403	{
6084	serge	404	const struct bdb_general_definitions *general;
2351	Serge	405
		406	general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
		407	if (general) {
		408	u16 block_size = get_blocksize(general);
		409	if (block_size >= sizeof(*general)) {
		410	int bus_pin = general->crt_ddc_gmbus_pin;
		411	DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
6084	serge	412	if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
4104	Serge	413	dev_priv->vbt.crt_ddc_pin = bus_pin;
2351	Serge	414	} else {
		415	DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
6084	serge	416	block_size);
2351	Serge	417	}
		418	}
		419	}
		420
6084	serge	421	static const union child_device_config *
		422	child_device_ptr(const struct bdb_general_definitions *p_defs, int i)
		423	{
		424	return (const void ) &p_defs->devices[i p_defs->child_dev_size];
		425	}
		426
2351	Serge	427	static void
		428	parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
6084	serge	429	const struct bdb_header *bdb)
2351	Serge	430	{
		431	struct sdvo_device_mapping *p_mapping;
6084	serge	432	const struct bdb_general_definitions *p_defs;
		433	const struct old_child_dev_config child; / legacy */
2351	Serge	434	int i, child_device_num, count;
		435	u16 block_size;
		436
		437	p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
		438	if (!p_defs) {
		439	DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
		440	return;
		441	}
6084	serge	442
		443	/*
		444	* Only parse SDVO mappings when the general definitions block child
		445	* device size matches that of the legacy child device config
		446	* struct. Thus, SDVO mapping will be skipped for newer VBT.
2351	Serge	447	*/
6084	serge	448	if (p_defs->child_dev_size != sizeof(*child)) {
		449	DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n");
2351	Serge	450	return;
		451	}
		452	/* get the block size of general definitions */
		453	block_size = get_blocksize(p_defs);
		454	/* get the number of child device */
		455	child_device_num = (block_size - sizeof(*p_defs)) /
6084	serge	456	p_defs->child_dev_size;
2351	Serge	457	count = 0;
		458	for (i = 0; i < child_device_num; i++) {
6084	serge	459	child = &child_device_ptr(p_defs, i)->old;
		460	if (!child->device_type) {
2351	Serge	461	/* skip the device block if device type is invalid */
		462	continue;
		463	}
6084	serge	464	if (child->slave_addr != SLAVE_ADDR1 &&
		465	child->slave_addr != SLAVE_ADDR2) {
2351	Serge	466	/*
		467	* If the slave address is neither 0x70 nor 0x72,
		468	* it is not a SDVO device. Skip it.
		469	*/
		470	continue;
		471	}
6084	serge	472	if (child->dvo_port != DEVICE_PORT_DVOB &&
		473	child->dvo_port != DEVICE_PORT_DVOC) {
2351	Serge	474	/* skip the incorrect SDVO port */
		475	DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
		476	continue;
		477	}
		478	DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
6084	serge	479	" %s port\n",
		480	child->slave_addr,
		481	(child->dvo_port == DEVICE_PORT_DVOB) ?
		482	"SDVOB" : "SDVOC");
		483	p_mapping = &(dev_priv->sdvo_mappings[child->dvo_port - 1]);
2351	Serge	484	if (!p_mapping->initialized) {
6084	serge	485	p_mapping->dvo_port = child->dvo_port;
		486	p_mapping->slave_addr = child->slave_addr;
		487	p_mapping->dvo_wiring = child->dvo_wiring;
		488	p_mapping->ddc_pin = child->ddc_pin;
		489	p_mapping->i2c_pin = child->i2c_pin;
2351	Serge	490	p_mapping->initialized = 1;
		491	DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
		492	p_mapping->dvo_port,
		493	p_mapping->slave_addr,
		494	p_mapping->dvo_wiring,
		495	p_mapping->ddc_pin,
		496	p_mapping->i2c_pin);
		497	} else {
		498	DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
		499	"two SDVO device.\n");
		500	}
6084	serge	501	if (child->slave2_addr) {
2351	Serge	502	/* Maybe this is a SDVO device with multiple inputs */
		503	/* And the mapping info is not added */
		504	DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
		505	" is a SDVO device with multiple inputs.\n");
		506	}
		507	count++;
		508	}
		509
		510	if (!count) {
		511	/* No SDVO device info is found */
		512	DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
		513	}
		514	return;
		515	}
		516
		517	static void
		518	parse_driver_features(struct drm_i915_private *dev_priv,
6084	serge	519	const struct bdb_header *bdb)
2351	Serge	520	{
6084	serge	521	const struct bdb_driver_features *driver;
2351	Serge	522
		523	driver = find_section(bdb, BDB_DRIVER_FEATURES);
		524	if (!driver)
		525	return;
		526
4560	Serge	527	if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
4104	Serge	528	dev_priv->vbt.edp_support = 1;
2351	Serge	529
		530	if (driver->dual_frequency)
		531	dev_priv->render_reclock_avail = true;
5060	serge	532
		533	DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
		534	/*
		535	* If DRRS is not supported, drrs_type has to be set to 0.
		536	* This is because, VBT is configured in such a way that
		537	* static DRRS is 0 and DRRS not supported is represented by
		538	* driver->drrs_enabled=false
		539	*/
		540	if (!driver->drrs_enabled)
		541	dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
2351	Serge	542	}
		543
		544	static void
6084	serge	545	parse_edp(struct drm_i915_private dev_priv, const struct bdb_header bdb)
2351	Serge	546	{
6084	serge	547	const struct bdb_edp *edp;
		548	const struct edp_power_seq *edp_pps;
		549	const struct edp_link_params *edp_link_params;
2351	Serge	550
		551	edp = find_section(bdb, BDB_EDP);
		552	if (!edp) {
4560	Serge	553	if (dev_priv->vbt.edp_support)
3120	serge	554	DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
2351	Serge	555	return;
		556	}
		557
		558	switch ((edp->color_depth >> (panel_type * 2)) & 3) {
		559	case EDP_18BPP:
4104	Serge	560	dev_priv->vbt.edp_bpp = 18;
2351	Serge	561	break;
		562	case EDP_24BPP:
4104	Serge	563	dev_priv->vbt.edp_bpp = 24;
2351	Serge	564	break;
		565	case EDP_30BPP:
4104	Serge	566	dev_priv->vbt.edp_bpp = 30;
2351	Serge	567	break;
		568	}
		569
		570	/* Get the eDP sequencing and link info */
		571	edp_pps = &edp->power_seqs[panel_type];
		572	edp_link_params = &edp->link_params[panel_type];
		573
4104	Serge	574	dev_priv->vbt.edp_pps = *edp_pps;
2351	Serge	575
5060	serge	576	switch (edp_link_params->rate) {
		577	case EDP_RATE_1_62:
		578	dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
		579	break;
		580	case EDP_RATE_2_7:
		581	dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
		582	break;
		583	default:
		584	DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
		585	edp_link_params->rate);
		586	break;
		587	}
		588
2351	Serge	589	switch (edp_link_params->lanes) {
5060	serge	590	case EDP_LANE_1:
4104	Serge	591	dev_priv->vbt.edp_lanes = 1;
2351	Serge	592	break;
5060	serge	593	case EDP_LANE_2:
4104	Serge	594	dev_priv->vbt.edp_lanes = 2;
2351	Serge	595	break;
5060	serge	596	case EDP_LANE_4:
4104	Serge	597	dev_priv->vbt.edp_lanes = 4;
2351	Serge	598	break;
5060	serge	599	default:
		600	DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
		601	edp_link_params->lanes);
		602	break;
2351	Serge	603	}
5060	serge	604
2351	Serge	605	switch (edp_link_params->preemphasis) {
5060	serge	606	case EDP_PREEMPHASIS_NONE:
5354	serge	607	dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
2351	Serge	608	break;
5060	serge	609	case EDP_PREEMPHASIS_3_5dB:
5354	serge	610	dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
2351	Serge	611	break;
5060	serge	612	case EDP_PREEMPHASIS_6dB:
5354	serge	613	dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
2351	Serge	614	break;
5060	serge	615	case EDP_PREEMPHASIS_9_5dB:
5354	serge	616	dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
2351	Serge	617	break;
5060	serge	618	default:
		619	DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
		620	edp_link_params->preemphasis);
		621	break;
2351	Serge	622	}
5060	serge	623
2351	Serge	624	switch (edp_link_params->vswing) {
5060	serge	625	case EDP_VSWING_0_4V:
5354	serge	626	dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
2351	Serge	627	break;
5060	serge	628	case EDP_VSWING_0_6V:
5354	serge	629	dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
2351	Serge	630	break;
5060	serge	631	case EDP_VSWING_0_8V:
5354	serge	632	dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
2351	Serge	633	break;
5060	serge	634	case EDP_VSWING_1_2V:
5354	serge	635	dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
2351	Serge	636	break;
5060	serge	637	default:
		638	DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
		639	edp_link_params->vswing);
		640	break;
2351	Serge	641	}
6084	serge	642
		643	if (bdb->version >= 173) {
		644	uint8_t vswing;
		645
		646	/* Don't read from VBT if module parameter has valid value*/
		647	if (i915.edp_vswing) {
		648	dev_priv->edp_low_vswing = i915.edp_vswing == 1;
		649	} else {
		650	vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
		651	dev_priv->edp_low_vswing = vswing == 0;
		652	}
		653	}
2351	Serge	654	}
		655
6084	serge	656	static void
		657	parse_psr(struct drm_i915_private dev_priv, const struct bdb_header bdb)
		658	{
		659	const struct bdb_psr *psr;
		660	const struct psr_table *psr_table;
		661
		662	psr = find_section(bdb, BDB_PSR);
		663	if (!psr) {
		664	DRM_DEBUG_KMS("No PSR BDB found.\n");
		665	return;
		666	}
		667
		668	psr_table = &psr->psr_table[panel_type];
		669
		670	dev_priv->vbt.psr.full_link = psr_table->full_link;
		671	dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
		672
		673	/* Allowed VBT values goes from 0 to 15 */
		674	dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
		675	psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
		676
		677	switch (psr_table->lines_to_wait) {
		678	case 0:
		679	dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
		680	break;
		681	case 1:
		682	dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
		683	break;
		684	case 2:
		685	dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
		686	break;
		687	case 3:
		688	dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
		689	break;
		690	default:
		691	DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
		692	psr_table->lines_to_wait);
		693	break;
		694	}
		695
		696	dev_priv->vbt.psr.tp1_wakeup_time = psr_table->tp1_wakeup_time;
		697	dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
		698	}
		699
2351	Serge	700	static void
7144	serge	701	parse_mipi_config(struct drm_i915_private *dev_priv,
		702	const struct bdb_header *bdb)
4560	Serge	703	{
6084	serge	704	const struct bdb_mipi_config *start;
		705	const struct mipi_config *config;
		706	const struct mipi_pps_data *pps;
4560	Serge	707
5060	serge	708	/* parse MIPI blocks only if LFP type is MIPI */
		709	if (!dev_priv->vbt.has_mipi)
4560	Serge	710	return;
5060	serge	711
		712	/* Initialize this to undefined indicating no generic MIPI support */
		713	dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
		714
		715	/* Block #40 is already parsed and panel_fixed_mode is
		716	* stored in dev_priv->lfp_lvds_vbt_mode
		717	* resuse this when needed
		718	*/
		719
		720	/* Parse #52 for panel index used from panel_type already
		721	* parsed
		722	*/
		723	start = find_section(bdb, BDB_MIPI_CONFIG);
		724	if (!start) {
		725	DRM_DEBUG_KMS("No MIPI config BDB found");
		726	return;
4560	Serge	727	}
		728
5060	serge	729	DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
		730	panel_type);
		731
		732	/*
		733	* get hold of the correct configuration block and pps data as per
		734	* the panel_type as index
		735	*/
		736	config = &start->config[panel_type];
		737	pps = &start->pps[panel_type];
		738
		739	/* store as of now full data. Trim when we realise all is not needed */
		740	dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
		741	if (!dev_priv->vbt.dsi.config)
		742	return;
		743
		744	dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
		745	if (!dev_priv->vbt.dsi.pps) {
		746	kfree(dev_priv->vbt.dsi.config);
		747	return;
		748	}
		749
		750	/* We have mandatory mipi config blocks. Initialize as generic panel */
		751	dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
7144	serge	752	}
5060	serge	753
7144	serge	754	/* Find the sequence block and size for the given panel. */
		755	static const u8 *
		756	find_panel_sequence_block(const struct bdb_mipi_sequence *sequence,
		757	u16 panel_id, u32 *seq_size)
		758	{
		759	u32 total = get_blocksize(sequence);
		760	const u8 *data = &sequence->data[0];
		761	u8 current_id;
		762	u32 current_size;
		763	int header_size = sequence->version >= 3 ? 5 : 3;
		764	int index = 0;
		765	int i;
		766
		767	/* skip new block size */
		768	if (sequence->version >= 3)
		769	data += 4;
		770
		771	for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) {
		772	if (index + header_size > total) {
		773	DRM_ERROR("Invalid sequence block (header)\n");
		774	return NULL;
		775	}
		776
		777	current_id = *(data + index);
		778	if (sequence->version >= 3)
		779	current_size = ((const u32 )(data + index + 1));
		780	else
		781	current_size = ((const u16 )(data + index + 1));
		782
		783	index += header_size;
		784
		785	if (index + current_size > total) {
		786	DRM_ERROR("Invalid sequence block\n");
		787	return NULL;
		788	}
		789
		790	if (current_id == panel_id) {
		791	*seq_size = current_size;
		792	return data + index;
		793	}
		794
		795	index += current_size;
5060	serge	796	}
		797
7144	serge	798	DRM_ERROR("Sequence block detected but no valid configuration\n");
		799
		800	return NULL;
		801	}
		802
		803	static int goto_next_sequence(const u8 *data, int index, int total)
		804	{
		805	u16 len;
		806
		807	/* Skip Sequence Byte. */
		808	for (index = index + 1; index < total; index += len) {
		809	u8 operation_byte = *(data + index);
		810	index++;
		811
		812	switch (operation_byte) {
		813	case MIPI_SEQ_ELEM_END:
		814	return index;
		815	case MIPI_SEQ_ELEM_SEND_PKT:
		816	if (index + 4 > total)
		817	return 0;
		818
		819	len = ((const u16 )(data + index + 2)) + 4;
		820	break;
		821	case MIPI_SEQ_ELEM_DELAY:
		822	len = 4;
		823	break;
		824	case MIPI_SEQ_ELEM_GPIO:
		825	len = 2;
		826	break;
		827	case MIPI_SEQ_ELEM_I2C:
		828	if (index + 7 > total)
		829	return 0;
		830	len = *(data + index + 6) + 7;
		831	break;
		832	default:
		833	DRM_ERROR("Unknown operation byte\n");
		834	return 0;
		835	}
6084	serge	836	}
		837
7144	serge	838	return 0;
		839	}
5060	serge	840
7144	serge	841	static int goto_next_sequence_v3(const u8 *data, int index, int total)
		842	{
		843	int seq_end;
		844	u16 len;
		845	u32 size_of_sequence;
5060	serge	846
		847	/*
7144	serge	848	* Could skip sequence based on Size of Sequence alone, but also do some
		849	* checking on the structure.
5060	serge	850	*/
7144	serge	851	if (total < 5) {
		852	DRM_ERROR("Too small sequence size\n");
		853	return 0;
		854	}
5060	serge	855
7144	serge	856	/* Skip Sequence Byte. */
		857	index++;
5060	serge	858
		859	/*
7144	serge	860	* Size of Sequence. Excludes the Sequence Byte and the size itself,
		861	* includes MIPI_SEQ_ELEM_END byte, excludes the final MIPI_SEQ_END
		862	* byte.
5060	serge	863	*/
7144	serge	864	size_of_sequence = ((const uint32_t )(data + index));
		865	index += 4;
5060	serge	866
7144	serge	867	seq_end = index + size_of_sequence;
		868	if (seq_end > total) {
		869	DRM_ERROR("Invalid sequence size\n");
		870	return 0;
		871	}
		872
		873	for (; index < total; index += len) {
		874	u8 operation_byte = *(data + index);
		875	index++;
		876
		877	if (operation_byte == MIPI_SEQ_ELEM_END) {
		878	if (index != seq_end) {
		879	DRM_ERROR("Invalid element structure\n");
		880	return 0;
		881	}
		882	return index;
5060	serge	883	}
7144	serge	884
		885	len = *(data + index);
		886	index++;
		887
		888	/*
		889	* FIXME: Would be nice to check elements like for v1/v2 in
		890	* goto_next_sequence() above.
		891	*/
		892	switch (operation_byte) {
		893	case MIPI_SEQ_ELEM_SEND_PKT:
		894	case MIPI_SEQ_ELEM_DELAY:
		895	case MIPI_SEQ_ELEM_GPIO:
		896	case MIPI_SEQ_ELEM_I2C:
		897	case MIPI_SEQ_ELEM_SPI:
		898	case MIPI_SEQ_ELEM_PMIC:
		899	break;
		900	default:
		901	DRM_ERROR("Unknown operation byte %u\n",
		902	operation_byte);
		903	break;
		904	}
5060	serge	905	}
		906
7144	serge	907	return 0;
		908	}
		909
		910	static void
		911	parse_mipi_sequence(struct drm_i915_private *dev_priv,
		912	const struct bdb_header *bdb)
		913	{
		914	const struct bdb_mipi_sequence *sequence;
		915	const u8 *seq_data;
		916	u32 seq_size;
		917	u8 *data;
		918	int index = 0;
		919
		920	/* Only our generic panel driver uses the sequence block. */
		921	if (dev_priv->vbt.dsi.panel_id != MIPI_DSI_GENERIC_PANEL_ID)
5060	serge	922	return;
7144	serge	923
		924	sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
		925	if (!sequence) {
		926	DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
		927	return;
5060	serge	928	}
		929
7144	serge	930	/* Fail gracefully for forward incompatible sequence block. */
		931	if (sequence->version >= 4) {
		932	DRM_ERROR("Unable to parse MIPI Sequence Block v%u\n",
		933	sequence->version);
5060	serge	934	return;
		935	}
		936
7144	serge	937	DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence->version);
		938
		939	seq_data = find_panel_sequence_block(sequence, panel_type, &seq_size);
		940	if (!seq_data)
5060	serge	941	return;
		942
7144	serge	943	data = kmemdup(seq_data, seq_size, GFP_KERNEL);
		944	if (!data)
		945	return;
5060	serge	946
7144	serge	947	/* Parse the sequences, store pointers to each sequence. */
		948	for (;;) {
		949	u8 seq_id = *(data + index);
		950	if (seq_id == MIPI_SEQ_END)
		951	break;
		952
		953	if (seq_id >= MIPI_SEQ_MAX) {
		954	DRM_ERROR("Unknown sequence %u\n", seq_id);
5060	serge	955	goto err;
		956	}
		957
7144	serge	958	dev_priv->vbt.dsi.sequence[seq_id] = data + index;
5060	serge	959
7144	serge	960	if (sequence->version >= 3)
		961	index = goto_next_sequence_v3(data, index, seq_size);
		962	else
		963	index = goto_next_sequence(data, index, seq_size);
		964	if (!index) {
		965	DRM_ERROR("Invalid sequence %u\n", seq_id);
5060	serge	966	goto err;
		967	}
		968	}
		969
7144	serge	970	dev_priv->vbt.dsi.data = data;
		971	dev_priv->vbt.dsi.size = seq_size;
		972	dev_priv->vbt.dsi.seq_version = sequence->version;
		973
		974	DRM_DEBUG_DRIVER("MIPI related VBT parsing complete\n");
5060	serge	975	return;
7144	serge	976
5060	serge	977	err:
7144	serge	978	kfree(data);
5060	serge	979	memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
4560	Serge	980	}
		981
6084	serge	982	static u8 translate_iboost(u8 val)
		983	{
		984	static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
		985
		986	if (val >= ARRAY_SIZE(mapping)) {
		987	DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
		988	return 0;
		989	}
		990	return mapping[val];
		991	}
		992
4560	Serge	993	static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
6084	serge	994	const struct bdb_header *bdb)
4560	Serge	995	{
		996	union child_device_config it, child = NULL;
		997	struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
		998	uint8_t hdmi_level_shift;
		999	int i, j;
		1000	bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
6084	serge	1001	uint8_t aux_channel, ddc_pin;
4560	Serge	1002	/* Each DDI port can have more than one value on the "DVO Port" field,
		1003	* so look for all the possible values for each port and abort if more
		1004	* than one is found. */
6084	serge	1005	int dvo_ports[][3] = {
		1006	{DVO_PORT_HDMIA, DVO_PORT_DPA, -1},
		1007	{DVO_PORT_HDMIB, DVO_PORT_DPB, -1},
		1008	{DVO_PORT_HDMIC, DVO_PORT_DPC, -1},
		1009	{DVO_PORT_HDMID, DVO_PORT_DPD, -1},
		1010	{DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE},
4560	Serge	1011	};
		1012
		1013	/* Find the child device to use, abort if more than one found. */
		1014	for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
		1015	it = dev_priv->vbt.child_dev + i;
		1016
6084	serge	1017	for (j = 0; j < 3; j++) {
4560	Serge	1018	if (dvo_ports[port][j] == -1)
		1019	break;
		1020
		1021	if (it->common.dvo_port == dvo_ports[port][j]) {
		1022	if (child) {
		1023	DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
		1024	port_name(port));
		1025	return;
		1026	}
		1027	child = it;
		1028	}
		1029	}
		1030	}
		1031	if (!child)
		1032	return;
		1033
		1034	aux_channel = child->raw[25];
6084	serge	1035	ddc_pin = child->common.ddc_pin;
4560	Serge	1036
		1037	is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
		1038	is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
		1039	is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
		1040	is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
		1041	is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
		1042
		1043	info->supports_dvi = is_dvi;
		1044	info->supports_hdmi = is_hdmi;
		1045	info->supports_dp = is_dp;
		1046
		1047	DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
		1048	port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
		1049
		1050	if (is_edp && is_dvi)
		1051	DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
		1052	port_name(port));
		1053	if (is_crt && port != PORT_E)
		1054	DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
		1055	if (is_crt && (is_dvi \|\| is_dp))
		1056	DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
		1057	port_name(port));
		1058	if (is_dvi && (port == PORT_A \|\| port == PORT_E))
5354	serge	1059	DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
4560	Serge	1060	if (!is_dvi && !is_dp && !is_crt)
		1061	DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
		1062	port_name(port));
		1063	if (is_edp && (port == PORT_B \|\| port == PORT_C \|\| port == PORT_E))
		1064	DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
		1065
		1066	if (is_dvi) {
6084	serge	1067	if (port == PORT_E) {
		1068	info->alternate_ddc_pin = ddc_pin;
		1069	/* if DDIE share ddc pin with other port, then
		1070	* dvi/hdmi couldn't exist on the shared port.
		1071	* Otherwise they share the same ddc bin and system
		1072	* couldn't communicate with them seperately. */
		1073	if (ddc_pin == DDC_PIN_B) {
		1074	dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
		1075	dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
		1076	} else if (ddc_pin == DDC_PIN_C) {
		1077	dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
		1078	dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
		1079	} else if (ddc_pin == DDC_PIN_D) {
		1080	dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
		1081	dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
		1082	}
		1083	} else if (ddc_pin == DDC_PIN_B && port != PORT_B)
4560	Serge	1084	DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
6084	serge	1085	else if (ddc_pin == DDC_PIN_C && port != PORT_C)
4560	Serge	1086	DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
6084	serge	1087	else if (ddc_pin == DDC_PIN_D && port != PORT_D)
4560	Serge	1088	DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
		1089	}
		1090
		1091	if (is_dp) {
6084	serge	1092	if (port == PORT_E) {
		1093	info->alternate_aux_channel = aux_channel;
		1094	/* if DDIE share aux channel with other port, then
		1095	* DP couldn't exist on the shared port. Otherwise
		1096	* they share the same aux channel and system
		1097	* couldn't communicate with them seperately. */
		1098	if (aux_channel == DP_AUX_A)
		1099	dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0;
		1100	else if (aux_channel == DP_AUX_B)
		1101	dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0;
		1102	else if (aux_channel == DP_AUX_C)
		1103	dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0;
		1104	else if (aux_channel == DP_AUX_D)
		1105	dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0;
		1106	}
		1107	else if (aux_channel == DP_AUX_A && port != PORT_A)
4560	Serge	1108	DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
6084	serge	1109	else if (aux_channel == DP_AUX_B && port != PORT_B)
4560	Serge	1110	DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
6084	serge	1111	else if (aux_channel == DP_AUX_C && port != PORT_C)
4560	Serge	1112	DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
6084	serge	1113	else if (aux_channel == DP_AUX_D && port != PORT_D)
4560	Serge	1114	DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
		1115	}
		1116
		1117	if (bdb->version >= 158) {
		1118	/* The VBT HDMI level shift values match the table we have. */
		1119	hdmi_level_shift = child->raw[7] & 0xF;
6084	serge	1120	DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
		1121	port_name(port),
		1122	hdmi_level_shift);
		1123	info->hdmi_level_shift = hdmi_level_shift;
		1124	}
		1125
		1126	/* Parse the I_boost config for SKL and above */
		1127	if (bdb->version >= 196 && (child->common.flags_1 & IBOOST_ENABLE)) {
		1128	info->dp_boost_level = translate_iboost(child->common.iboost_level & 0xF);
		1129	DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
		1130	port_name(port), info->dp_boost_level);
		1131	info->hdmi_boost_level = translate_iboost(child->common.iboost_level >> 4);
		1132	DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
		1133	port_name(port), info->hdmi_boost_level);
		1134	}
4560	Serge	1135	}
		1136
		1137	static void parse_ddi_ports(struct drm_i915_private *dev_priv,
6084	serge	1138	const struct bdb_header *bdb)
4560	Serge	1139	{
		1140	enum port port;
		1141
6937	serge	1142	if (!HAS_DDI(dev_priv))
4560	Serge	1143	return;
		1144
		1145	if (!dev_priv->vbt.child_dev_num)
		1146	return;
		1147
		1148	if (bdb->version < 155)
		1149	return;
		1150
		1151	for (port = PORT_A; port < I915_MAX_PORTS; port++)
		1152	parse_ddi_port(dev_priv, port, bdb);
		1153	}
		1154
		1155	static void
2351	Serge	1156	parse_device_mapping(struct drm_i915_private *dev_priv,
6084	serge	1157	const struct bdb_header *bdb)
2351	Serge	1158	{
6084	serge	1159	const struct bdb_general_definitions *p_defs;
		1160	const union child_device_config *p_child;
		1161	union child_device_config *child_dev_ptr;
2351	Serge	1162	int i, child_device_num, count;
6084	serge	1163	u8 expected_size;
		1164	u16 block_size;
2351	Serge	1165
		1166	p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
		1167	if (!p_defs) {
		1168	DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
		1169	return;
		1170	}
7144	serge	1171	if (bdb->version < 106) {
		1172	expected_size = 22;
		1173	} else if (bdb->version < 109) {
		1174	expected_size = 27;
		1175	} else if (bdb->version < 195) {
		1176	BUILD_BUG_ON(sizeof(struct old_child_dev_config) != 33);
6084	serge	1177	expected_size = sizeof(struct old_child_dev_config);
		1178	} else if (bdb->version == 195) {
		1179	expected_size = 37;
		1180	} else if (bdb->version <= 197) {
		1181	expected_size = 38;
		1182	} else {
		1183	expected_size = 38;
		1184	BUILD_BUG_ON(sizeof(*p_child) < 38);
		1185	DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
		1186	bdb->version, expected_size);
		1187	}
		1188
7144	serge	1189	/* Flag an error for unexpected size, but continue anyway. */
		1190	if (p_defs->child_dev_size != expected_size)
		1191	DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n",
		1192	p_defs->child_dev_size, expected_size, bdb->version);
		1193
6084	serge	1194	/* The legacy sized child device config is the minimum we need. */
		1195	if (p_defs->child_dev_size < sizeof(struct old_child_dev_config)) {
7144	serge	1196	DRM_DEBUG_KMS("Child device config size %u is too small.\n",
		1197	p_defs->child_dev_size);
2351	Serge	1198	return;
		1199	}
6084	serge	1200
2351	Serge	1201	/* get the block size of general definitions */
		1202	block_size = get_blocksize(p_defs);
		1203	/* get the number of child device */
		1204	child_device_num = (block_size - sizeof(*p_defs)) /
6084	serge	1205	p_defs->child_dev_size;
2351	Serge	1206	count = 0;
		1207	/* get the number of child device that is present */
		1208	for (i = 0; i < child_device_num; i++) {
6084	serge	1209	p_child = child_device_ptr(p_defs, i);
4560	Serge	1210	if (!p_child->common.device_type) {
2351	Serge	1211	/* skip the device block if device type is invalid */
		1212	continue;
		1213	}
		1214	count++;
		1215	}
		1216	if (!count) {
		1217	DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
		1218	return;
		1219	}
4104	Serge	1220	dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
		1221	if (!dev_priv->vbt.child_dev) {
2351	Serge	1222	DRM_DEBUG_KMS("No memory space for child device\n");
		1223	return;
		1224	}
		1225
4104	Serge	1226	dev_priv->vbt.child_dev_num = count;
2351	Serge	1227	count = 0;
		1228	for (i = 0; i < child_device_num; i++) {
6084	serge	1229	p_child = child_device_ptr(p_defs, i);
4560	Serge	1230	if (!p_child->common.device_type) {
2351	Serge	1231	/* skip the device block if device type is invalid */
		1232	continue;
		1233	}
5060	serge	1234
		1235	if (p_child->common.dvo_port >= DVO_PORT_MIPIA
		1236	&& p_child->common.dvo_port <= DVO_PORT_MIPID
		1237	&&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) {
		1238	DRM_DEBUG_KMS("Found MIPI as LFP\n");
		1239	dev_priv->vbt.has_mipi = 1;
		1240	dev_priv->vbt.dsi.port = p_child->common.dvo_port;
		1241	}
		1242
4104	Serge	1243	child_dev_ptr = dev_priv->vbt.child_dev + count;
2351	Serge	1244	count++;
6084	serge	1245
		1246	/*
		1247	* Copy as much as we know (sizeof) and is available
		1248	* (child_dev_size) of the child device. Accessing the data must
		1249	* depend on VBT version.
		1250	*/
		1251	memcpy(child_dev_ptr, p_child,
		1252	min_t(size_t, p_defs->child_dev_size, sizeof(*p_child)));
2351	Serge	1253	}
		1254	return;
		1255	}
		1256
		1257	static void
		1258	init_vbt_defaults(struct drm_i915_private *dev_priv)
		1259	{
4560	Serge	1260	enum port port;
2351	Serge	1261
6084	serge	1262	dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
2351	Serge	1263
5060	serge	1264	/* Default to having backlight */
		1265	dev_priv->vbt.backlight.present = true;
		1266
2351	Serge	1267	/* LFP panel data */
4104	Serge	1268	dev_priv->vbt.lvds_dither = 1;
		1269	dev_priv->vbt.lvds_vbt = 0;
2351	Serge	1270
		1271	/* SDVO panel data */
4104	Serge	1272	dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
2351	Serge	1273
		1274	/* general features */
4104	Serge	1275	dev_priv->vbt.int_tv_support = 1;
		1276	dev_priv->vbt.int_crt_support = 1;
2351	Serge	1277
		1278	/* Default to using SSC */
4104	Serge	1279	dev_priv->vbt.lvds_use_ssc = 1;
4560	Serge	1280	/*
		1281	* Core/SandyBridge/IvyBridge use alternative (120MHz) reference
		1282	* clock for LVDS.
		1283	*/
6937	serge	1284	dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev_priv,
		1285	!HAS_PCH_SPLIT(dev_priv));
4560	Serge	1286	DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
		1287
		1288	for (port = PORT_A; port < I915_MAX_PORTS; port++) {
		1289	struct ddi_vbt_port_info *info =
		1290	&dev_priv->vbt.ddi_port_info[port];
		1291
5354	serge	1292	info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
4560	Serge	1293
		1294	info->supports_dvi = (port != PORT_A && port != PORT_E);
		1295	info->supports_hdmi = info->supports_dvi;
		1296	info->supports_dp = (port != PORT_E);
		1297	}
2351	Serge	1298	}
		1299
6937	serge	1300	static const struct bdb_header get_bdb_header(const struct vbt_header vbt)
5097	serge	1301	{
6937	serge	1302	const void *_vbt = vbt;
		1303
		1304	return _vbt + vbt->bdb_offset;
5097	serge	1305	}
		1306
6937	serge	1307	/**
		1308	* intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
		1309	* @buf: pointer to a buffer to validate
		1310	* @size: size of the buffer
		1311	*
		1312	* Returns true on valid VBT.
		1313	*/
		1314	bool intel_bios_is_valid_vbt(const void *buf, size_t size)
7144	serge	1315	{
6937	serge	1316	const struct vbt_header *vbt = buf;
6084	serge	1317	const struct bdb_header *bdb;
3120	serge	1318
6937	serge	1319	if (!vbt)
		1320	return false;
		1321
		1322	if (sizeof(struct vbt_header) > size) {
5060	serge	1323	DRM_DEBUG_DRIVER("VBT header incomplete\n");
6937	serge	1324	return false;
5060	serge	1325	}
		1326
		1327	if (memcmp(vbt->signature, "$VBT", 4)) {
		1328	DRM_DEBUG_DRIVER("VBT invalid signature\n");
6937	serge	1329	return false;
5060	serge	1330	}
		1331
6937	serge	1332	if (vbt->bdb_offset + sizeof(struct bdb_header) > size) {
5060	serge	1333	DRM_DEBUG_DRIVER("BDB header incomplete\n");
6937	serge	1334	return false;
5060	serge	1335	}
		1336
6937	serge	1337	bdb = get_bdb_header(vbt);
		1338	if (vbt->bdb_offset + bdb->bdb_size > size) {
5060	serge	1339	DRM_DEBUG_DRIVER("BDB incomplete\n");
6937	serge	1340	return false;
5060	serge	1341	}
		1342
6937	serge	1343	return vbt;
5060	serge	1344	}
		1345
6937	serge	1346	static const struct vbt_header find_vbt(void __iomem bios, size_t size)
6084	serge	1347	{
		1348	size_t i;
		1349
		1350	/* Scour memory looking for the VBT signature. */
		1351	for (i = 0; i + 4 < size; i++) {
6937	serge	1352	void *vbt;
		1353
		1354	if (ioread32(bios + i) != ((const u32 ) "$VBT"))
		1355	continue;
		1356
7144	serge	1357	/*
6937	serge	1358	* This is the one place where we explicitly discard the address
		1359	* space (__iomem) of the BIOS/VBT.
7144	serge	1360	*/
6937	serge	1361	vbt = (void __force *) bios + i;
		1362	if (intel_bios_is_valid_vbt(vbt, size - i))
		1363	return vbt;
6084	serge	1364
7144	serge	1365	break;
		1366	}
6084	serge	1367
6937	serge	1368	return NULL;
6084	serge	1369	}
		1370
2351	Serge	1371	/**
6937	serge	1372	* intel_bios_init - find VBT and initialize settings from the BIOS
7144	serge	1373	* @dev_priv: i915 device instance
2351	Serge	1374	*
		1375	* Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
		1376	* to appropriate values.
		1377	*
		1378	* Returns 0 on success, nonzero on failure.
		1379	*/
3031	serge	1380	int
6937	serge	1381	intel_bios_init(struct drm_i915_private *dev_priv)
2351	Serge	1382	{
6937	serge	1383	struct pci_dev *pdev = dev_priv->dev->pdev;
		1384	const struct vbt_header *vbt = dev_priv->opregion.vbt;
		1385	const struct bdb_header *bdb;
2351	Serge	1386	u8 __iomem *bios = NULL;
		1387
6937	serge	1388	if (HAS_PCH_NOP(dev_priv))
3746	Serge	1389	return -ENODEV;
		1390
2351	Serge	1391	init_vbt_defaults(dev_priv);
		1392
6937	serge	1393	if (!vbt) {
6084	serge	1394	size_t size;
2351	Serge	1395
2360	Serge	1396	bios = pci_map_rom(pdev, &size);
2351	Serge	1397	if (!bios)
		1398	return -1;
		1399
6937	serge	1400	vbt = find_vbt(bios, size);
		1401	if (!vbt) {
2351	Serge	1402	pci_unmap_rom(pdev, bios);
		1403	return -1;
		1404	}
6937	serge	1405
		1406	DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
2351	Serge	1407	}
		1408
6937	serge	1409	bdb = get_bdb_header(vbt);
		1410
		1411	DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
		1412	(int)sizeof(vbt->signature), vbt->signature, bdb->version);
		1413
2351	Serge	1414	/* Grab useful general definitions */
		1415	parse_general_features(dev_priv, bdb);
		1416	parse_general_definitions(dev_priv, bdb);
		1417	parse_lfp_panel_data(dev_priv, bdb);
4560	Serge	1418	parse_lfp_backlight(dev_priv, bdb);
2351	Serge	1419	parse_sdvo_panel_data(dev_priv, bdb);
		1420	parse_sdvo_device_mapping(dev_priv, bdb);
		1421	parse_device_mapping(dev_priv, bdb);
		1422	parse_driver_features(dev_priv, bdb);
		1423	parse_edp(dev_priv, bdb);
6084	serge	1424	parse_psr(dev_priv, bdb);
7144	serge	1425	parse_mipi_config(dev_priv, bdb);
		1426	parse_mipi_sequence(dev_priv, bdb);
4560	Serge	1427	parse_ddi_ports(dev_priv, bdb);
2351	Serge	1428
		1429	if (bios)
		1430	pci_unmap_rom(pdev, bios);
		1431
		1432	return 0;
		1433	}

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(root)/drivers/video/drm/i915/intel_bios.c @ 2361 – Rev 7144