2 * Copyright © 2006 Intel Corporation
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:
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
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
24 * Eric Anholt <eric@anholt.net>
28 #include <drm/drm_dp_helper.h>
30 #include <drm/i915_drm.h>
32 #include "intel_bios.h"
35 * DOC: Video BIOS Table (VBT)
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
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.)
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
56 #define SLAVE_ADDR1 0x70
57 #define SLAVE_ADDR2 0x72
59 static int panel_type
;
61 /* Get BDB block size given a pointer to Block ID. */
62 static u32
_get_blocksize(const u8
*block_base
)
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));
68 return *((const u16
*)(block_base
+ 1));
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
)
74 return _get_blocksize(block_data
- 3);
78 find_section(const void *_bdb
, int section_id
)
80 const struct bdb_header
*bdb
= _bdb
;
81 const u8
*base
= _bdb
;
83 u32 total
, current_size
;
86 /* skip to first section */
87 index
+= bdb
->header_size
;
88 total
= bdb
->bdb_size
;
90 /* walk the sections looking for section_id */
91 while (index
+ 3 < total
) {
92 current_id
= *(base
+ index
);
93 current_size
= _get_blocksize(base
+ index
);
96 if (index
+ current_size
> total
)
99 if (current_id
== section_id
)
102 index
+= current_size
;
109 fill_detail_timing_data(struct drm_display_mode
*panel_fixed_mode
,
110 const struct lvds_dvo_timing
*dvo_timing
)
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
);
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
;
132 if (dvo_timing
->hsync_positive
)
133 panel_fixed_mode
->flags
|= DRM_MODE_FLAG_PHSYNC
;
135 panel_fixed_mode
->flags
|= DRM_MODE_FLAG_NHSYNC
;
137 if (dvo_timing
->vsync_positive
)
138 panel_fixed_mode
->flags
|= DRM_MODE_FLAG_PVSYNC
;
140 panel_fixed_mode
->flags
|= DRM_MODE_FLAG_NVSYNC
;
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;
148 drm_mode_set_name(panel_fixed_mode
);
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
,
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
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
;
170 return (struct lvds_dvo_timing
*)(entry
+ dvo_timing_offset
);
173 /* get lvds_fp_timing entry
174 * this function may return NULL if the corresponding entry is invalid
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
,
182 size_t data_ofs
= (const u8
*)data
- (const u8
*)bdb
;
183 u16 data_size
= ((const u16
*)data
)[-1]; /* stored in header */
186 if (index
>= ARRAY_SIZE(ptrs
->ptr
))
188 ofs
= ptrs
->ptr
[index
].fp_timing_offset
;
189 if (ofs
< data_ofs
||
190 ofs
+ sizeof(struct lvds_fp_timing
) > data_ofs
+ data_size
)
192 return (const struct lvds_fp_timing
*)((const u8
*)bdb
+ ofs
);
195 /* Try to find integrated panel data */
197 parse_lfp_panel_data(struct drm_i915_private
*dev_priv
,
198 const struct bdb_header
*bdb
)
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
;
204 const struct lvds_fp_timing
*fp_timing
;
205 struct drm_display_mode
*panel_fixed_mode
;
208 lvds_options
= find_section(bdb
, BDB_LVDS_OPTIONS
);
212 dev_priv
->vbt
.lvds_dither
= lvds_options
->pixel_dither
;
213 if (lvds_options
->panel_type
== 0xff)
216 panel_type
= lvds_options
->panel_type
;
218 drrs_mode
= (lvds_options
->dps_panel_type_bits
219 >> (panel_type
* 2)) & MODE_MASK
;
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.
227 dev_priv
->vbt
.drrs_type
= STATIC_DRRS_SUPPORT
;
228 DRM_DEBUG_KMS("DRRS supported mode is static\n");
231 dev_priv
->vbt
.drrs_type
= SEAMLESS_DRRS_SUPPORT
;
232 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
235 dev_priv
->vbt
.drrs_type
= DRRS_NOT_SUPPORTED
;
236 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
240 lvds_lfp_data
= find_section(bdb
, BDB_LVDS_LFP_DATA
);
244 lvds_lfp_data_ptrs
= find_section(bdb
, BDB_LVDS_LFP_DATA_PTRS
);
245 if (!lvds_lfp_data_ptrs
)
248 dev_priv
->vbt
.lvds_vbt
= 1;
250 panel_dvo_timing
= get_lvds_dvo_timing(lvds_lfp_data
,
252 lvds_options
->panel_type
);
254 panel_fixed_mode
= kzalloc(sizeof(*panel_fixed_mode
), GFP_KERNEL
);
255 if (!panel_fixed_mode
)
258 fill_detail_timing_data(panel_fixed_mode
, panel_dvo_timing
);
260 dev_priv
->vbt
.lfp_lvds_vbt_mode
= panel_fixed_mode
;
262 DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
263 drm_mode_debug_printmodeline(panel_fixed_mode
);
265 fp_timing
= get_lvds_fp_timing(bdb
, lvds_lfp_data
,
267 lvds_options
->panel_type
);
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
) {
272 dev_priv
->vbt
.bios_lvds_val
= fp_timing
->lvds_reg_val
;
273 DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
274 dev_priv
->vbt
.bios_lvds_val
);
280 parse_lfp_backlight(struct drm_i915_private
*dev_priv
,
281 const struct bdb_header
*bdb
)
283 const struct bdb_lfp_backlight_data
*backlight_data
;
284 const struct bdb_lfp_backlight_data_entry
*entry
;
286 backlight_data
= find_section(bdb
, BDB_LVDS_BACKLIGHT
);
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
);
296 entry
= &backlight_data
->data
[panel_type
];
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",
305 dev_priv
->vbt
.backlight
.pwm_freq_hz
= entry
->pwm_freq_hz
;
306 dev_priv
->vbt
.backlight
.active_low_pwm
= entry
->active_low_pwm
;
307 dev_priv
->vbt
.backlight
.min_brightness
= entry
->min_brightness
;
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",
312 dev_priv
->vbt
.backlight
.min_brightness
,
313 backlight_data
->level
[panel_type
]);
316 /* Try to find sdvo panel data */
318 parse_sdvo_panel_data(struct drm_i915_private
*dev_priv
,
319 const struct bdb_header
*bdb
)
321 const struct lvds_dvo_timing
*dvo_timing
;
322 struct drm_display_mode
*panel_fixed_mode
;
325 index
= i915
.vbt_sdvo_panel_type
;
327 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
332 const struct bdb_sdvo_lvds_options
*sdvo_lvds_options
;
334 sdvo_lvds_options
= find_section(bdb
, BDB_SDVO_LVDS_OPTIONS
);
335 if (!sdvo_lvds_options
)
338 index
= sdvo_lvds_options
->panel_type
;
341 dvo_timing
= find_section(bdb
, BDB_SDVO_PANEL_DTDS
);
345 panel_fixed_mode
= kzalloc(sizeof(*panel_fixed_mode
), GFP_KERNEL
);
346 if (!panel_fixed_mode
)
349 fill_detail_timing_data(panel_fixed_mode
, dvo_timing
+ index
);
351 dev_priv
->vbt
.sdvo_lvds_vbt_mode
= panel_fixed_mode
;
353 DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
354 drm_mode_debug_printmodeline(panel_fixed_mode
);
357 static int intel_bios_ssc_frequency(struct drm_i915_private
*dev_priv
,
360 switch (INTEL_INFO(dev_priv
)->gen
) {
362 return alternate
? 66667 : 48000;
365 return alternate
? 100000 : 96000;
367 return alternate
? 100000 : 120000;
372 parse_general_features(struct drm_i915_private
*dev_priv
,
373 const struct bdb_header
*bdb
)
375 const struct bdb_general_features
*general
;
377 general
= find_section(bdb
, BDB_GENERAL_FEATURES
);
381 dev_priv
->vbt
.int_tv_support
= general
->int_tv_support
;
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
)))
385 dev_priv
->vbt
.int_crt_support
= general
->int_crt_support
;
386 dev_priv
->vbt
.lvds_use_ssc
= general
->enable_ssc
;
387 dev_priv
->vbt
.lvds_ssc_freq
=
388 intel_bios_ssc_frequency(dev_priv
, general
->ssc_freq
);
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
);
401 parse_general_definitions(struct drm_i915_private
*dev_priv
,
402 const struct bdb_header
*bdb
)
404 const struct bdb_general_definitions
*general
;
406 general
= find_section(bdb
, BDB_GENERAL_DEFINITIONS
);
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
);
412 if (intel_gmbus_is_valid_pin(dev_priv
, bus_pin
))
413 dev_priv
->vbt
.crt_ddc_pin
= bus_pin
;
415 DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
421 static const union child_device_config
*
422 child_device_ptr(const struct bdb_general_definitions
*p_defs
, int i
)
424 return (const void *) &p_defs
->devices
[i
* p_defs
->child_dev_size
];
428 parse_sdvo_device_mapping(struct drm_i915_private
*dev_priv
,
429 const struct bdb_header
*bdb
)
431 struct sdvo_device_mapping
*p_mapping
;
432 const struct bdb_general_definitions
*p_defs
;
433 const struct old_child_dev_config
*child
; /* legacy */
434 int i
, child_device_num
, count
;
437 p_defs
= find_section(bdb
, BDB_GENERAL_DEFINITIONS
);
439 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
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.
448 if (p_defs
->child_dev_size
!= sizeof(*child
)) {
449 DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n");
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
)) /
456 p_defs
->child_dev_size
;
458 for (i
= 0; i
< child_device_num
; i
++) {
459 child
= &child_device_ptr(p_defs
, i
)->old
;
460 if (!child
->device_type
) {
461 /* skip the device block if device type is invalid */
464 if (child
->slave_addr
!= SLAVE_ADDR1
&&
465 child
->slave_addr
!= SLAVE_ADDR2
) {
467 * If the slave address is neither 0x70 nor 0x72,
468 * it is not a SDVO device. Skip it.
472 if (child
->dvo_port
!= DEVICE_PORT_DVOB
&&
473 child
->dvo_port
!= DEVICE_PORT_DVOC
) {
474 /* skip the incorrect SDVO port */
475 DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
478 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
481 (child
->dvo_port
== DEVICE_PORT_DVOB
) ?
483 p_mapping
= &(dev_priv
->sdvo_mappings
[child
->dvo_port
- 1]);
484 if (!p_mapping
->initialized
) {
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
;
490 p_mapping
->initialized
= 1;
491 DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
493 p_mapping
->slave_addr
,
494 p_mapping
->dvo_wiring
,
498 DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
499 "two SDVO device.\n");
501 if (child
->slave2_addr
) {
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");
511 /* No SDVO device info is found */
512 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
518 parse_driver_features(struct drm_i915_private
*dev_priv
,
519 const struct bdb_header
*bdb
)
521 const struct bdb_driver_features
*driver
;
523 driver
= find_section(bdb
, BDB_DRIVER_FEATURES
);
527 if (driver
->lvds_config
== BDB_DRIVER_FEATURE_EDP
)
528 dev_priv
->vbt
.edp_support
= 1;
530 if (driver
->dual_frequency
)
531 dev_priv
->render_reclock_avail
= true;
533 DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver
->drrs_enabled
);
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
540 if (!driver
->drrs_enabled
)
541 dev_priv
->vbt
.drrs_type
= DRRS_NOT_SUPPORTED
;
545 parse_edp(struct drm_i915_private
*dev_priv
, const struct bdb_header
*bdb
)
547 const struct bdb_edp
*edp
;
548 const struct edp_power_seq
*edp_pps
;
549 const struct edp_link_params
*edp_link_params
;
551 edp
= find_section(bdb
, BDB_EDP
);
553 if (dev_priv
->vbt
.edp_support
)
554 DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
558 switch ((edp
->color_depth
>> (panel_type
* 2)) & 3) {
560 dev_priv
->vbt
.edp_bpp
= 18;
563 dev_priv
->vbt
.edp_bpp
= 24;
566 dev_priv
->vbt
.edp_bpp
= 30;
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
];
574 dev_priv
->vbt
.edp_pps
= *edp_pps
;
576 switch (edp_link_params
->rate
) {
578 dev_priv
->vbt
.edp_rate
= DP_LINK_BW_1_62
;
581 dev_priv
->vbt
.edp_rate
= DP_LINK_BW_2_7
;
584 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
585 edp_link_params
->rate
);
589 switch (edp_link_params
->lanes
) {
591 dev_priv
->vbt
.edp_lanes
= 1;
594 dev_priv
->vbt
.edp_lanes
= 2;
597 dev_priv
->vbt
.edp_lanes
= 4;
600 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
601 edp_link_params
->lanes
);
605 switch (edp_link_params
->preemphasis
) {
606 case EDP_PREEMPHASIS_NONE
:
607 dev_priv
->vbt
.edp_preemphasis
= DP_TRAIN_PRE_EMPH_LEVEL_0
;
609 case EDP_PREEMPHASIS_3_5dB
:
610 dev_priv
->vbt
.edp_preemphasis
= DP_TRAIN_PRE_EMPH_LEVEL_1
;
612 case EDP_PREEMPHASIS_6dB
:
613 dev_priv
->vbt
.edp_preemphasis
= DP_TRAIN_PRE_EMPH_LEVEL_2
;
615 case EDP_PREEMPHASIS_9_5dB
:
616 dev_priv
->vbt
.edp_preemphasis
= DP_TRAIN_PRE_EMPH_LEVEL_3
;
619 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
620 edp_link_params
->preemphasis
);
624 switch (edp_link_params
->vswing
) {
625 case EDP_VSWING_0_4V
:
626 dev_priv
->vbt
.edp_vswing
= DP_TRAIN_VOLTAGE_SWING_LEVEL_0
;
628 case EDP_VSWING_0_6V
:
629 dev_priv
->vbt
.edp_vswing
= DP_TRAIN_VOLTAGE_SWING_LEVEL_1
;
631 case EDP_VSWING_0_8V
:
632 dev_priv
->vbt
.edp_vswing
= DP_TRAIN_VOLTAGE_SWING_LEVEL_2
;
634 case EDP_VSWING_1_2V
:
635 dev_priv
->vbt
.edp_vswing
= DP_TRAIN_VOLTAGE_SWING_LEVEL_3
;
638 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
639 edp_link_params
->vswing
);
643 if (bdb
->version
>= 173) {
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;
650 vswing
= (edp
->edp_vswing_preemph
>> (panel_type
* 4)) & 0xF;
651 dev_priv
->edp_low_vswing
= vswing
== 0;
657 parse_psr(struct drm_i915_private
*dev_priv
, const struct bdb_header
*bdb
)
659 const struct bdb_psr
*psr
;
660 const struct psr_table
*psr_table
;
662 psr
= find_section(bdb
, BDB_PSR
);
664 DRM_DEBUG_KMS("No PSR BDB found.\n");
668 psr_table
= &psr
->psr_table
[panel_type
];
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
;
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
;
677 switch (psr_table
->lines_to_wait
) {
679 dev_priv
->vbt
.psr
.lines_to_wait
= PSR_0_LINES_TO_WAIT
;
682 dev_priv
->vbt
.psr
.lines_to_wait
= PSR_1_LINE_TO_WAIT
;
685 dev_priv
->vbt
.psr
.lines_to_wait
= PSR_4_LINES_TO_WAIT
;
688 dev_priv
->vbt
.psr
.lines_to_wait
= PSR_8_LINES_TO_WAIT
;
691 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
692 psr_table
->lines_to_wait
);
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
;
701 parse_mipi_config(struct drm_i915_private
*dev_priv
,
702 const struct bdb_header
*bdb
)
704 const struct bdb_mipi_config
*start
;
705 const struct mipi_config
*config
;
706 const struct mipi_pps_data
*pps
;
708 /* parse MIPI blocks only if LFP type is MIPI */
709 if (!dev_priv
->vbt
.has_mipi
)
712 /* Initialize this to undefined indicating no generic MIPI support */
713 dev_priv
->vbt
.dsi
.panel_id
= MIPI_DSI_UNDEFINED_PANEL_ID
;
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
720 /* Parse #52 for panel index used from panel_type already
723 start
= find_section(bdb
, BDB_MIPI_CONFIG
);
725 DRM_DEBUG_KMS("No MIPI config BDB found");
729 DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
733 * get hold of the correct configuration block and pps data as per
734 * the panel_type as index
736 config
= &start
->config
[panel_type
];
737 pps
= &start
->pps
[panel_type
];
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
)
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
);
750 /* We have mandatory mipi config blocks. Initialize as generic panel */
751 dev_priv
->vbt
.dsi
.panel_id
= MIPI_DSI_GENERIC_PANEL_ID
;
754 /* Find the sequence block and size for the given panel. */
756 find_panel_sequence_block(const struct bdb_mipi_sequence
*sequence
,
757 u16 panel_id
, u32
*seq_size
)
759 u32 total
= get_blocksize(sequence
);
760 const u8
*data
= &sequence
->data
[0];
763 int header_size
= sequence
->version
>= 3 ? 5 : 3;
767 /* skip new block size */
768 if (sequence
->version
>= 3)
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");
777 current_id
= *(data
+ index
);
778 if (sequence
->version
>= 3)
779 current_size
= *((const u32
*)(data
+ index
+ 1));
781 current_size
= *((const u16
*)(data
+ index
+ 1));
783 index
+= header_size
;
785 if (index
+ current_size
> total
) {
786 DRM_ERROR("Invalid sequence block\n");
790 if (current_id
== panel_id
) {
791 *seq_size
= current_size
;
795 index
+= current_size
;
798 DRM_ERROR("Sequence block detected but no valid configuration\n");
803 static int goto_next_sequence(const u8
*data
, int index
, int total
)
807 /* Skip Sequence Byte. */
808 for (index
= index
+ 1; index
< total
; index
+= len
) {
809 u8 operation_byte
= *(data
+ index
);
812 switch (operation_byte
) {
813 case MIPI_SEQ_ELEM_END
:
815 case MIPI_SEQ_ELEM_SEND_PKT
:
816 if (index
+ 4 > total
)
819 len
= *((const u16
*)(data
+ index
+ 2)) + 4;
821 case MIPI_SEQ_ELEM_DELAY
:
824 case MIPI_SEQ_ELEM_GPIO
:
827 case MIPI_SEQ_ELEM_I2C
:
828 if (index
+ 7 > total
)
830 len
= *(data
+ index
+ 6) + 7;
833 DRM_ERROR("Unknown operation byte\n");
841 static int goto_next_sequence_v3(const u8
*data
, int index
, int total
)
845 u32 size_of_sequence
;
848 * Could skip sequence based on Size of Sequence alone, but also do some
849 * checking on the structure.
852 DRM_ERROR("Too small sequence size\n");
856 /* Skip Sequence Byte. */
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
864 size_of_sequence
= *((const uint32_t *)(data
+ index
));
867 seq_end
= index
+ size_of_sequence
;
868 if (seq_end
> total
) {
869 DRM_ERROR("Invalid sequence size\n");
873 for (; index
< total
; index
+= len
) {
874 u8 operation_byte
= *(data
+ index
);
877 if (operation_byte
== MIPI_SEQ_ELEM_END
) {
878 if (index
!= seq_end
) {
879 DRM_ERROR("Invalid element structure\n");
885 len
= *(data
+ index
);
889 * FIXME: Would be nice to check elements like for v1/v2 in
890 * goto_next_sequence() above.
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
:
901 DRM_ERROR("Unknown operation byte %u\n",
911 parse_mipi_sequence(struct drm_i915_private
*dev_priv
,
912 const struct bdb_header
*bdb
)
914 const struct bdb_mipi_sequence
*sequence
;
920 /* Only our generic panel driver uses the sequence block. */
921 if (dev_priv
->vbt
.dsi
.panel_id
!= MIPI_DSI_GENERIC_PANEL_ID
)
924 sequence
= find_section(bdb
, BDB_MIPI_SEQUENCE
);
926 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
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",
937 DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence
->version
);
939 seq_data
= find_panel_sequence_block(sequence
, panel_type
, &seq_size
);
943 data
= kmemdup(seq_data
, seq_size
, GFP_KERNEL
);
947 /* Parse the sequences, store pointers to each sequence. */
949 u8 seq_id
= *(data
+ index
);
950 if (seq_id
== MIPI_SEQ_END
)
953 if (seq_id
>= MIPI_SEQ_MAX
) {
954 DRM_ERROR("Unknown sequence %u\n", seq_id
);
958 dev_priv
->vbt
.dsi
.sequence
[seq_id
] = data
+ index
;
960 if (sequence
->version
>= 3)
961 index
= goto_next_sequence_v3(data
, index
, seq_size
);
963 index
= goto_next_sequence(data
, index
, seq_size
);
965 DRM_ERROR("Invalid sequence %u\n", seq_id
);
970 dev_priv
->vbt
.dsi
.data
= data
;
971 dev_priv
->vbt
.dsi
.size
= seq_size
;
972 dev_priv
->vbt
.dsi
.seq_version
= sequence
->version
;
974 DRM_DEBUG_DRIVER("MIPI related VBT parsing complete\n");
979 memset(dev_priv
->vbt
.dsi
.sequence
, 0, sizeof(dev_priv
->vbt
.dsi
.sequence
));
982 static u8
translate_iboost(u8 val
)
984 static const u8 mapping
[] = { 1, 3, 7 }; /* See VBT spec */
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
);
993 static void parse_ddi_port(struct drm_i915_private
*dev_priv
, enum port port
,
994 const struct bdb_header
*bdb
)
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
;
1000 bool is_dvi
, is_hdmi
, is_dp
, is_edp
, is_crt
;
1001 uint8_t aux_channel
, ddc_pin
;
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. */
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
},
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
;
1017 for (j
= 0; j
< 3; j
++) {
1018 if (dvo_ports
[port
][j
] == -1)
1021 if (it
->common
.dvo_port
== dvo_ports
[port
][j
]) {
1023 DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
1034 aux_channel
= child
->raw
[25];
1035 ddc_pin
= child
->common
.ddc_pin
;
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
);
1043 info
->supports_dvi
= is_dvi
;
1044 info
->supports_hdmi
= is_hdmi
;
1045 info
->supports_dp
= is_dp
;
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
);
1050 if (is_edp
&& is_dvi
)
1051 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
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",
1058 if (is_dvi
&& (port
== PORT_A
|| port
== PORT_E
))
1059 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port
));
1060 if (!is_dvi
&& !is_dp
&& !is_crt
)
1061 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
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
));
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;
1083 } else if (ddc_pin
== DDC_PIN_B
&& port
!= PORT_B
)
1084 DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
1085 else if (ddc_pin
== DDC_PIN_C
&& port
!= PORT_C
)
1086 DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
1087 else if (ddc_pin
== DDC_PIN_D
&& port
!= PORT_D
)
1088 DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
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;
1107 else if (aux_channel
== DP_AUX_A
&& port
!= PORT_A
)
1108 DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
1109 else if (aux_channel
== DP_AUX_B
&& port
!= PORT_B
)
1110 DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
1111 else if (aux_channel
== DP_AUX_C
&& port
!= PORT_C
)
1112 DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
1113 else if (aux_channel
== DP_AUX_D
&& port
!= PORT_D
)
1114 DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
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;
1120 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1123 info
->hdmi_level_shift
= hdmi_level_shift
;
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
);
1137 static void parse_ddi_ports(struct drm_i915_private
*dev_priv
,
1138 const struct bdb_header
*bdb
)
1142 if (!HAS_DDI(dev_priv
))
1145 if (!dev_priv
->vbt
.child_dev_num
)
1148 if (bdb
->version
< 155)
1151 for (port
= PORT_A
; port
< I915_MAX_PORTS
; port
++)
1152 parse_ddi_port(dev_priv
, port
, bdb
);
1156 parse_device_mapping(struct drm_i915_private
*dev_priv
,
1157 const struct bdb_header
*bdb
)
1159 const struct bdb_general_definitions
*p_defs
;
1160 const union child_device_config
*p_child
;
1161 union child_device_config
*child_dev_ptr
;
1162 int i
, child_device_num
, count
;
1166 p_defs
= find_section(bdb
, BDB_GENERAL_DEFINITIONS
);
1168 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1171 if (bdb
->version
< 106) {
1173 } else if (bdb
->version
< 109) {
1175 } else if (bdb
->version
< 195) {
1176 BUILD_BUG_ON(sizeof(struct old_child_dev_config
) != 33);
1177 expected_size
= sizeof(struct old_child_dev_config
);
1178 } else if (bdb
->version
== 195) {
1180 } else if (bdb
->version
<= 197) {
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
);
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
);
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
)) {
1196 DRM_DEBUG_KMS("Child device config size %u is too small.\n",
1197 p_defs
->child_dev_size
);
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
)) /
1205 p_defs
->child_dev_size
;
1207 /* get the number of child device that is present */
1208 for (i
= 0; i
< child_device_num
; i
++) {
1209 p_child
= child_device_ptr(p_defs
, i
);
1210 if (!p_child
->common
.device_type
) {
1211 /* skip the device block if device type is invalid */
1217 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1220 dev_priv
->vbt
.child_dev
= kcalloc(count
, sizeof(*p_child
), GFP_KERNEL
);
1221 if (!dev_priv
->vbt
.child_dev
) {
1222 DRM_DEBUG_KMS("No memory space for child device\n");
1226 dev_priv
->vbt
.child_dev_num
= count
;
1228 for (i
= 0; i
< child_device_num
; i
++) {
1229 p_child
= child_device_ptr(p_defs
, i
);
1230 if (!p_child
->common
.device_type
) {
1231 /* skip the device block if device type is invalid */
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
;
1243 child_dev_ptr
= dev_priv
->vbt
.child_dev
+ count
;
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.
1251 memcpy(child_dev_ptr
, p_child
,
1252 min_t(size_t, p_defs
->child_dev_size
, sizeof(*p_child
)));
1258 init_vbt_defaults(struct drm_i915_private
*dev_priv
)
1262 dev_priv
->vbt
.crt_ddc_pin
= GMBUS_PIN_VGADDC
;
1264 /* Default to having backlight */
1265 dev_priv
->vbt
.backlight
.present
= true;
1267 /* LFP panel data */
1268 dev_priv
->vbt
.lvds_dither
= 1;
1269 dev_priv
->vbt
.lvds_vbt
= 0;
1271 /* SDVO panel data */
1272 dev_priv
->vbt
.sdvo_lvds_vbt_mode
= NULL
;
1274 /* general features */
1275 dev_priv
->vbt
.int_tv_support
= 1;
1276 dev_priv
->vbt
.int_crt_support
= 1;
1278 /* Default to using SSC */
1279 dev_priv
->vbt
.lvds_use_ssc
= 1;
1281 * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1284 dev_priv
->vbt
.lvds_ssc_freq
= intel_bios_ssc_frequency(dev_priv
,
1285 !HAS_PCH_SPLIT(dev_priv
));
1286 DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv
->vbt
.lvds_ssc_freq
);
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
];
1292 info
->hdmi_level_shift
= HDMI_LEVEL_SHIFT_UNKNOWN
;
1294 info
->supports_dvi
= (port
!= PORT_A
&& port
!= PORT_E
);
1295 info
->supports_hdmi
= info
->supports_dvi
;
1296 info
->supports_dp
= (port
!= PORT_E
);
1300 static const struct bdb_header
*get_bdb_header(const struct vbt_header
*vbt
)
1302 const void *_vbt
= vbt
;
1304 return _vbt
+ vbt
->bdb_offset
;
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
1312 * Returns true on valid VBT.
1314 bool intel_bios_is_valid_vbt(const void *buf
, size_t size
)
1316 const struct vbt_header
*vbt
= buf
;
1317 const struct bdb_header
*bdb
;
1322 if (sizeof(struct vbt_header
) > size
) {
1323 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1327 if (memcmp(vbt
->signature
, "$VBT", 4)) {
1328 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1332 if (vbt
->bdb_offset
+ sizeof(struct bdb_header
) > size
) {
1333 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1337 bdb
= get_bdb_header(vbt
);
1338 if (vbt
->bdb_offset
+ bdb
->bdb_size
> size
) {
1339 DRM_DEBUG_DRIVER("BDB incomplete\n");
1346 static const struct vbt_header
*find_vbt(void __iomem
*bios
, size_t size
)
1350 /* Scour memory looking for the VBT signature. */
1351 for (i
= 0; i
+ 4 < size
; i
++) {
1354 if (ioread32(bios
+ i
) != *((const u32
*) "$VBT"))
1358 * This is the one place where we explicitly discard the address
1359 * space (__iomem) of the BIOS/VBT.
1361 vbt
= (void __force
*) bios
+ i
;
1362 if (intel_bios_is_valid_vbt(vbt
, size
- i
))
1372 * intel_bios_init - find VBT and initialize settings from the BIOS
1373 * @dev_priv: i915 device instance
1375 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
1376 * to appropriate values.
1378 * Returns 0 on success, nonzero on failure.
1381 intel_bios_init(struct drm_i915_private
*dev_priv
)
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
;
1386 u8 __iomem
*bios
= NULL
;
1388 if (HAS_PCH_NOP(dev_priv
))
1391 init_vbt_defaults(dev_priv
);
1396 bios
= pci_map_rom(pdev
, &size
);
1400 vbt
= find_vbt(bios
, size
);
1402 pci_unmap_rom(pdev
, bios
);
1406 DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
1409 bdb
= get_bdb_header(vbt
);
1411 DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
1412 (int)sizeof(vbt
->signature
), vbt
->signature
, bdb
->version
);
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
);
1418 parse_lfp_backlight(dev_priv
, bdb
);
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
);
1424 parse_psr(dev_priv
, bdb
);
1425 parse_mipi_config(dev_priv
, bdb
);
1426 parse_mipi_sequence(dev_priv
, bdb
);
1427 parse_ddi_ports(dev_priv
, bdb
);
1430 pci_unmap_rom(pdev
, bios
);