intel_opregion.c

   1/*
   2 * Copyright 2008 Intel Corporation <hong.liu@intel.com>
   3 * Copyright 2008 Red Hat <mjg@redhat.com>
   4 *
   5 * Permission is hereby granted, free of charge, to any person obtaining
   6 * a copy of this software and associated documentation files (the
   7 * "Software"), to deal in the Software without restriction, including
   8 * without limitation the rights to use, copy, modify, merge, publish,
   9 * distribute, sub license, and/or sell copies of the Software, and to
  10 * permit persons to whom the Software is furnished to do so, subject to
  11 * the following conditions:
  12 *
  13 * The above copyright notice and this permission notice (including the
  14 * next paragraph) shall be included in all copies or substantial
  15 * portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20 * NON-INFRINGEMENT.  IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE
  21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  22 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24 * SOFTWARE.
  25 *
  26 */
  27
  28#include <linux/acpi.h>
  29#include <linux/debugfs.h>
  30#include <linux/dmi.h>
  31#include <linux/iopoll.h>
  32#include <acpi/video.h>
  33
  34#include <drm/drm_edid.h>
  35#include <drm/drm_file.h>
  36#include <drm/drm_print.h>
  37
  38#include "intel_acpi.h"
  39#include "intel_backlight.h"
  40#include "intel_display_core.h"
  41#include "intel_display_types.h"
  42#include "intel_opregion.h"
  43#include "intel_pci_config.h"
  44
  45#define OPREGION_HEADER_OFFSET 0
  46#define OPREGION_ACPI_OFFSET   0x100
  47#define   ACPI_CLID 0x01ac /* current lid state indicator */
  48#define   ACPI_CDCK 0x01b0 /* current docking state indicator */
  49#define OPREGION_SWSCI_OFFSET  0x200
  50#define OPREGION_ASLE_OFFSET   0x300
  51#define OPREGION_VBT_OFFSET    0x400
  52#define OPREGION_ASLE_EXT_OFFSET	0x1C00
  53
  54#define OPREGION_SIGNATURE "IntelGraphicsMem"
  55#define MBOX_ACPI		BIT(0)	/* Mailbox #1 */
  56#define MBOX_SWSCI		BIT(1)	/* Mailbox #2 (obsolete from v2.x) */
  57#define MBOX_ASLE		BIT(2)	/* Mailbox #3 */
  58#define MBOX_ASLE_EXT		BIT(4)	/* Mailbox #5 */
  59#define MBOX_BACKLIGHT		BIT(5)	/* Mailbox #2 (valid from v3.x) */
  60
  61#define PCON_HEADLESS_SKU	BIT(13)
  62
  63struct opregion_header {
  64	u8 signature[16];
  65	u32 size;
  66	struct {
  67		u8 rsvd;
  68		u8 revision;
  69		u8 minor;
  70		u8 major;
  71	}  __packed over;
  72	u8 bios_ver[32];
  73	u8 vbios_ver[16];
  74	u8 driver_ver[16];
  75	u32 mboxes;
  76	u32 driver_model;
  77	u32 pcon;
  78	u8 dver[32];
  79	u8 rsvd[124];
  80} __packed;
  81
  82/* OpRegion mailbox #1: public ACPI methods */
  83struct opregion_acpi {
  84	u32 drdy;       /* driver readiness */
  85	u32 csts;       /* notification status */
  86	u32 cevt;       /* current event */
  87	u8 rsvd1[20];
  88	u32 didl[8];    /* supported display devices ID list */
  89	u32 cpdl[8];    /* currently presented display list */
  90	u32 cadl[8];    /* currently active display list */
  91	u32 nadl[8];    /* next active devices list */
  92	u32 aslp;       /* ASL sleep time-out */
  93	u32 tidx;       /* toggle table index */
  94	u32 chpd;       /* current hotplug enable indicator */
  95	u32 clid;       /* current lid state*/
  96	u32 cdck;       /* current docking state */
  97	u32 sxsw;       /* Sx state resume */
  98	u32 evts;       /* ASL supported events */
  99	u32 cnot;       /* current OS notification */
 100	u32 nrdy;       /* driver status */
 101	u32 did2[7];	/* extended supported display devices ID list */
 102	u32 cpd2[7];	/* extended attached display devices list */
 103	u8 rsvd2[4];
 104} __packed;
 105
 106/* OpRegion mailbox #2: SWSCI */
 107struct opregion_swsci {
 108	u32 scic;       /* SWSCI command|status|data */
 109	u32 parm;       /* command parameters */
 110	u32 dslp;       /* driver sleep time-out */
 111	u8 rsvd[244];
 112} __packed;
 113
 114/* OpRegion mailbox #3: ASLE */
 115struct opregion_asle {
 116	u32 ardy;       /* driver readiness */
 117	u32 aslc;       /* ASLE interrupt command */
 118	u32 tche;       /* technology enabled indicator */
 119	u32 alsi;       /* current ALS illuminance reading */
 120	u32 bclp;       /* backlight brightness to set */
 121	u32 pfit;       /* panel fitting state */
 122	u32 cblv;       /* current brightness level */
 123	u16 bclm[20];   /* backlight level duty cycle mapping table */
 124	u32 cpfm;       /* current panel fitting mode */
 125	u32 epfm;       /* enabled panel fitting modes */
 126	u8 plut[74];    /* panel LUT and identifier */
 127	u32 pfmb;       /* PWM freq and min brightness */
 128	u32 cddv;       /* color correction default values */
 129	u32 pcft;       /* power conservation features */
 130	u32 srot;       /* supported rotation angles */
 131	u32 iuer;       /* IUER events */
 132	u64 fdss;
 133	u32 fdsp;
 134	u32 stat;
 135	u64 rvda;	/* Physical (2.0) or relative from opregion (2.1+)
 136			 * address of raw VBT data. */
 137	u32 rvds;	/* Size of raw vbt data */
 138	u8 rsvd[58];
 139} __packed;
 140
 141/* OpRegion mailbox #5: ASLE ext */
 142struct opregion_asle_ext {
 143	u32 phed;	/* Panel Header */
 144	u8 bddc[256];	/* Panel EDID */
 145	u8 rsvd[764];
 146} __packed;
 147
 148/* Driver readiness indicator */
 149#define ASLE_ARDY_READY		(1 << 0)
 150#define ASLE_ARDY_NOT_READY	(0 << 0)
 151
 152/* ASLE Interrupt Command (ASLC) bits */
 153#define ASLC_SET_ALS_ILLUM		(1 << 0)
 154#define ASLC_SET_BACKLIGHT		(1 << 1)
 155#define ASLC_SET_PFIT			(1 << 2)
 156#define ASLC_SET_PWM_FREQ		(1 << 3)
 157#define ASLC_SUPPORTED_ROTATION_ANGLES	(1 << 4)
 158#define ASLC_BUTTON_ARRAY		(1 << 5)
 159#define ASLC_CONVERTIBLE_INDICATOR	(1 << 6)
 160#define ASLC_DOCKING_INDICATOR		(1 << 7)
 161#define ASLC_ISCT_STATE_CHANGE		(1 << 8)
 162#define ASLC_REQ_MSK			0x1ff
 163/* response bits */
 164#define ASLC_ALS_ILLUM_FAILED		(1 << 10)
 165#define ASLC_BACKLIGHT_FAILED		(1 << 12)
 166#define ASLC_PFIT_FAILED		(1 << 14)
 167#define ASLC_PWM_FREQ_FAILED		(1 << 16)
 168#define ASLC_ROTATION_ANGLES_FAILED	(1 << 18)
 169#define ASLC_BUTTON_ARRAY_FAILED	(1 << 20)
 170#define ASLC_CONVERTIBLE_FAILED		(1 << 22)
 171#define ASLC_DOCKING_FAILED		(1 << 24)
 172#define ASLC_ISCT_STATE_FAILED		(1 << 26)
 173
 174/* Technology enabled indicator */
 175#define ASLE_TCHE_ALS_EN	(1 << 0)
 176#define ASLE_TCHE_BLC_EN	(1 << 1)
 177#define ASLE_TCHE_PFIT_EN	(1 << 2)
 178#define ASLE_TCHE_PFMB_EN	(1 << 3)
 179
 180/* ASLE backlight brightness to set */
 181#define ASLE_BCLP_VALID                (1<<31)
 182#define ASLE_BCLP_MSK          (~(1<<31))
 183
 184/* ASLE panel fitting request */
 185#define ASLE_PFIT_VALID         (1<<31)
 186#define ASLE_PFIT_CENTER (1<<0)
 187#define ASLE_PFIT_STRETCH_TEXT (1<<1)
 188#define ASLE_PFIT_STRETCH_GFX (1<<2)
 189
 190/* PWM frequency and minimum brightness */
 191#define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
 192#define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
 193#define ASLE_PFMB_PWM_MASK (0x7ffffe00)
 194#define ASLE_PFMB_PWM_VALID (1<<31)
 195
 196#define ASLE_CBLV_VALID         (1<<31)
 197
 198/* IUER */
 199#define ASLE_IUER_DOCKING		(1 << 7)
 200#define ASLE_IUER_CONVERTIBLE		(1 << 6)
 201#define ASLE_IUER_ROTATION_LOCK_BTN	(1 << 4)
 202#define ASLE_IUER_VOLUME_DOWN_BTN	(1 << 3)
 203#define ASLE_IUER_VOLUME_UP_BTN		(1 << 2)
 204#define ASLE_IUER_WINDOWS_BTN		(1 << 1)
 205#define ASLE_IUER_POWER_BTN		(1 << 0)
 206
 207#define ASLE_PHED_EDID_VALID_MASK	0x3
 208
 209/* Software System Control Interrupt (SWSCI) */
 210#define SWSCI_SCIC_INDICATOR		(1 << 0)
 211#define SWSCI_SCIC_MAIN_FUNCTION_SHIFT	1
 212#define SWSCI_SCIC_MAIN_FUNCTION_MASK	(0xf << 1)
 213#define SWSCI_SCIC_SUB_FUNCTION_SHIFT	8
 214#define SWSCI_SCIC_SUB_FUNCTION_MASK	(0xff << 8)
 215#define SWSCI_SCIC_EXIT_PARAMETER_SHIFT	8
 216#define SWSCI_SCIC_EXIT_PARAMETER_MASK	(0xff << 8)
 217#define SWSCI_SCIC_EXIT_STATUS_SHIFT	5
 218#define SWSCI_SCIC_EXIT_STATUS_MASK	(7 << 5)
 219#define SWSCI_SCIC_EXIT_STATUS_SUCCESS	1
 220
 221#define SWSCI_FUNCTION_CODE(main, sub) \
 222	((main) << SWSCI_SCIC_MAIN_FUNCTION_SHIFT | \
 223	 (sub) << SWSCI_SCIC_SUB_FUNCTION_SHIFT)
 224
 225/* SWSCI: Get BIOS Data (GBDA) */
 226#define SWSCI_GBDA			4
 227#define SWSCI_GBDA_SUPPORTED_CALLS	SWSCI_FUNCTION_CODE(SWSCI_GBDA, 0)
 228#define SWSCI_GBDA_REQUESTED_CALLBACKS	SWSCI_FUNCTION_CODE(SWSCI_GBDA, 1)
 229#define SWSCI_GBDA_BOOT_DISPLAY_PREF	SWSCI_FUNCTION_CODE(SWSCI_GBDA, 4)
 230#define SWSCI_GBDA_PANEL_DETAILS	SWSCI_FUNCTION_CODE(SWSCI_GBDA, 5)
 231#define SWSCI_GBDA_TV_STANDARD		SWSCI_FUNCTION_CODE(SWSCI_GBDA, 6)
 232#define SWSCI_GBDA_INTERNAL_GRAPHICS	SWSCI_FUNCTION_CODE(SWSCI_GBDA, 7)
 233#define SWSCI_GBDA_SPREAD_SPECTRUM	SWSCI_FUNCTION_CODE(SWSCI_GBDA, 10)
 234
 235/* SWSCI: System BIOS Callbacks (SBCB) */
 236#define SWSCI_SBCB			6
 237#define SWSCI_SBCB_SUPPORTED_CALLBACKS	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 0)
 238#define SWSCI_SBCB_INIT_COMPLETION	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 1)
 239#define SWSCI_SBCB_PRE_HIRES_SET_MODE	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 3)
 240#define SWSCI_SBCB_POST_HIRES_SET_MODE	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 4)
 241#define SWSCI_SBCB_DISPLAY_SWITCH	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 5)
 242#define SWSCI_SBCB_SET_TV_FORMAT	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 6)
 243#define SWSCI_SBCB_ADAPTER_POWER_STATE	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 7)
 244#define SWSCI_SBCB_DISPLAY_POWER_STATE	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 8)
 245#define SWSCI_SBCB_SET_BOOT_DISPLAY	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 9)
 246#define SWSCI_SBCB_SET_PANEL_DETAILS	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 10)
 247#define SWSCI_SBCB_SET_INTERNAL_GFX	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 11)
 248#define SWSCI_SBCB_POST_HIRES_TO_DOS_FS	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 16)
 249#define SWSCI_SBCB_SUSPEND_RESUME	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 17)
 250#define SWSCI_SBCB_SET_SPREAD_SPECTRUM	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 18)
 251#define SWSCI_SBCB_POST_VBE_PM		SWSCI_FUNCTION_CODE(SWSCI_SBCB, 19)
 252#define SWSCI_SBCB_ENABLE_DISABLE_AUDIO	SWSCI_FUNCTION_CODE(SWSCI_SBCB, 21)
 253
 254#define MAX_DSLP	1500
 255
 256#define OPREGION_SIZE	(8 * 1024)
 257
 258struct intel_opregion {
 259	struct intel_display *display;
 260
 261	struct opregion_header *header;
 262	struct opregion_acpi *acpi;
 263	struct opregion_swsci *swsci;
 264	u32 swsci_gbda_sub_functions;
 265	u32 swsci_sbcb_sub_functions;
 266	struct opregion_asle *asle;
 267	struct opregion_asle_ext *asle_ext;
 268	void *rvda;
 269	const void *vbt;
 270	u32 vbt_size;
 271	struct work_struct asle_work;
 272	struct notifier_block acpi_notifier;
 273};
 274
 275static int check_swsci_function(struct intel_display *display, u32 function)
 276{
 277	struct intel_opregion *opregion = display->opregion;
 278	struct opregion_swsci *swsci;
 279	u32 main_function, sub_function;
 280
 281	if (!opregion)
 282		return -ENODEV;
 283
 284	swsci = opregion->swsci;
 285	if (!swsci)
 286		return -ENODEV;
 287
 288	main_function = (function & SWSCI_SCIC_MAIN_FUNCTION_MASK) >>
 289		SWSCI_SCIC_MAIN_FUNCTION_SHIFT;
 290	sub_function = (function & SWSCI_SCIC_SUB_FUNCTION_MASK) >>
 291		SWSCI_SCIC_SUB_FUNCTION_SHIFT;
 292
 293	/* Check if we can call the function. See swsci_setup for details. */
 294	if (main_function == SWSCI_SBCB) {
 295		if ((opregion->swsci_sbcb_sub_functions &
 296		     (1 << sub_function)) == 0)
 297			return -EINVAL;
 298	} else if (main_function == SWSCI_GBDA) {
 299		if ((opregion->swsci_gbda_sub_functions &
 300		     (1 << sub_function)) == 0)
 301			return -EINVAL;
 302	}
 303
 304	return 0;
 305}
 306
 307static int swsci(struct intel_display *display,
 308		 u32 function, u32 parm, u32 *parm_out)
 309{
 310	struct opregion_swsci *swsci;
 311	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
 312	u32 scic, dslp;
 313	u16 swsci_val;
 314	int ret;
 315
 316	ret = check_swsci_function(display, function);
 317	if (ret)
 318		return ret;
 319
 320	swsci = display->opregion->swsci;
 321
 322	/* Driver sleep timeout in ms. */
 323	dslp = swsci->dslp;
 324	if (!dslp) {
 325		/* The spec says 2ms should be the default, but it's too small
 326		 * for some machines. */
 327		dslp = 50;
 328	} else if (dslp > MAX_DSLP) {
 329		/* Hey bios, trust must be earned. */
 330		DRM_INFO_ONCE("ACPI BIOS requests an excessive sleep of %u ms, "
 331			      "using %u ms instead\n", dslp, MAX_DSLP);
 332		dslp = MAX_DSLP;
 333	}
 334
 335	/* The spec tells us to do this, but we are the only user... */
 336	scic = swsci->scic;
 337	if (scic & SWSCI_SCIC_INDICATOR) {
 338		drm_dbg(display->drm, "SWSCI request already in progress\n");
 339		return -EBUSY;
 340	}
 341
 342	scic = function | SWSCI_SCIC_INDICATOR;
 343
 344	swsci->parm = parm;
 345	swsci->scic = scic;
 346
 347	/* Ensure SCI event is selected and event trigger is cleared. */
 348	pci_read_config_word(pdev, SWSCI, &swsci_val);
 349	if (!(swsci_val & SWSCI_SCISEL) || (swsci_val & SWSCI_GSSCIE)) {
 350		swsci_val |= SWSCI_SCISEL;
 351		swsci_val &= ~SWSCI_GSSCIE;
 352		pci_write_config_word(pdev, SWSCI, swsci_val);
 353	}
 354
 355	/* Use event trigger to tell bios to check the mail. */
 356	swsci_val |= SWSCI_GSSCIE;
 357	pci_write_config_word(pdev, SWSCI, swsci_val);
 358
 359	/* Poll for the result. */
 360	ret = poll_timeout_us(scic = swsci->scic,
 361			      (scic & SWSCI_SCIC_INDICATOR) == 0,
 362			      1000, dslp * 1000, false);
 363	if (ret) {
 364		drm_dbg(display->drm, "SWSCI request timed out\n");
 365		return ret;
 366	}
 367
 368	scic = (scic & SWSCI_SCIC_EXIT_STATUS_MASK) >>
 369		SWSCI_SCIC_EXIT_STATUS_SHIFT;
 370
 371	/* Note: scic == 0 is an error! */
 372	if (scic != SWSCI_SCIC_EXIT_STATUS_SUCCESS) {
 373		drm_dbg(display->drm, "SWSCI request error %u\n", scic);
 374		return -EIO;
 375	}
 376
 377	if (parm_out)
 378		*parm_out = swsci->parm;
 379
 380	return 0;
 381
 382#undef C
 383}
 384
 385#define DISPLAY_TYPE_CRT			0
 386#define DISPLAY_TYPE_TV				1
 387#define DISPLAY_TYPE_EXTERNAL_FLAT_PANEL	2
 388#define DISPLAY_TYPE_INTERNAL_FLAT_PANEL	3
 389
 390int intel_opregion_notify_encoder(struct intel_encoder *encoder,
 391				  bool enable)
 392{
 393	struct intel_display *display = to_intel_display(encoder);
 394	u32 parm = 0;
 395	u32 type = 0;
 396	u32 port;
 397	int ret;
 398
 399	/* don't care about old stuff for now */
 400	if (!HAS_DDI(display))
 401		return 0;
 402
 403	/* Avoid port out of bounds checks if SWSCI isn't there. */
 404	ret = check_swsci_function(display, SWSCI_SBCB_DISPLAY_POWER_STATE);
 405	if (ret)
 406		return ret;
 407
 408	if (encoder->type == INTEL_OUTPUT_DSI)
 409		port = 0;
 410	else
 411		port = encoder->port;
 412
 413	if (port == PORT_E)  {
 414		port = 0;
 415	} else {
 416		parm |= 1 << port;
 417		port++;
 418	}
 419
 420	/*
 421	 * The port numbering and mapping here is bizarre. The now-obsolete
 422	 * swsci spec supports ports numbered [0..4]. Port E is handled as a
 423	 * special case, but port F and beyond are not. The functionality is
 424	 * supposed to be obsolete for new platforms. Just bail out if the port
 425	 * number is out of bounds after mapping.
 426	 */
 427	if (port > 4) {
 428		drm_dbg_kms(display->drm,
 429			    "[ENCODER:%d:%s] port %c (index %u) out of bounds for display power state notification\n",
 430			    encoder->base.base.id, encoder->base.name,
 431			    port_name(encoder->port), port);
 432		return -EINVAL;
 433	}
 434
 435	if (!enable)
 436		parm |= 4 << 8;
 437
 438	switch (encoder->type) {
 439	case INTEL_OUTPUT_ANALOG:
 440		type = DISPLAY_TYPE_CRT;
 441		break;
 442	case INTEL_OUTPUT_DDI:
 443	case INTEL_OUTPUT_DP:
 444	case INTEL_OUTPUT_HDMI:
 445	case INTEL_OUTPUT_DP_MST:
 446		type = DISPLAY_TYPE_EXTERNAL_FLAT_PANEL;
 447		break;
 448	case INTEL_OUTPUT_EDP:
 449	case INTEL_OUTPUT_DSI:
 450		type = DISPLAY_TYPE_INTERNAL_FLAT_PANEL;
 451		break;
 452	default:
 453		drm_WARN_ONCE(display->drm, 1,
 454			      "unsupported intel_encoder type %d\n",
 455			      encoder->type);
 456		return -EINVAL;
 457	}
 458
 459	parm |= type << (16 + port * 3);
 460
 461	return swsci(display, SWSCI_SBCB_DISPLAY_POWER_STATE, parm, NULL);
 462}
 463
 464static const struct {
 465	pci_power_t pci_power_state;
 466	u32 parm;
 467} power_state_map[] = {
 468	{ PCI_D0,	0x00 },
 469	{ PCI_D1,	0x01 },
 470	{ PCI_D2,	0x02 },
 471	{ PCI_D3hot,	0x04 },
 472	{ PCI_D3cold,	0x04 },
 473};
 474
 475int intel_opregion_notify_adapter(struct intel_display *display,
 476				  pci_power_t state)
 477{
 478	int i;
 479
 480	if (!HAS_DDI(display))
 481		return 0;
 482
 483	for (i = 0; i < ARRAY_SIZE(power_state_map); i++) {
 484		if (state == power_state_map[i].pci_power_state)
 485			return swsci(display, SWSCI_SBCB_ADAPTER_POWER_STATE,
 486				     power_state_map[i].parm, NULL);
 487	}
 488
 489	return -EINVAL;
 490}
 491
 492static u32 asle_set_backlight(struct intel_display *display, u32 bclp)
 493{
 494	struct intel_connector *connector;
 495	struct drm_connector_list_iter conn_iter;
 496	struct opregion_asle *asle = display->opregion->asle;
 497
 498	drm_dbg(display->drm, "bclp = 0x%08x\n", bclp);
 499
 500	if (acpi_video_get_backlight_type() == acpi_backlight_native) {
 501		drm_dbg_kms(display->drm,
 502			    "opregion backlight request ignored\n");
 503		return 0;
 504	}
 505
 506	if (!(bclp & ASLE_BCLP_VALID))
 507		return ASLC_BACKLIGHT_FAILED;
 508
 509	bclp &= ASLE_BCLP_MSK;
 510	if (bclp > 255)
 511		return ASLC_BACKLIGHT_FAILED;
 512
 513	drm_modeset_lock(&display->drm->mode_config.connection_mutex, NULL);
 514
 515	/*
 516	 * Update backlight on all connectors that support backlight (usually
 517	 * only one).
 518	 */
 519	drm_dbg_kms(display->drm, "updating opregion backlight %d/255\n",
 520		    bclp);
 521	drm_connector_list_iter_begin(display->drm, &conn_iter);
 522	for_each_intel_connector_iter(connector, &conn_iter)
 523		intel_backlight_set_acpi(connector->base.state, bclp, 255);
 524	drm_connector_list_iter_end(&conn_iter);
 525	asle->cblv = DIV_ROUND_UP(bclp * 100, 255) | ASLE_CBLV_VALID;
 526
 527	drm_modeset_unlock(&display->drm->mode_config.connection_mutex);
 528
 529
 530	return 0;
 531}
 532
 533static u32 asle_set_als_illum(struct intel_display *display, u32 alsi)
 534{
 535	/* alsi is the current ALS reading in lux. 0 indicates below sensor
 536	   range, 0xffff indicates above sensor range. 1-0xfffe are valid */
 537	drm_dbg(display->drm, "Illum is not supported\n");
 538	return ASLC_ALS_ILLUM_FAILED;
 539}
 540
 541static u32 asle_set_pwm_freq(struct intel_display *display, u32 pfmb)
 542{
 543	drm_dbg(display->drm, "PWM freq is not supported\n");
 544	return ASLC_PWM_FREQ_FAILED;
 545}
 546
 547static u32 asle_set_pfit(struct intel_display *display, u32 pfit)
 548{
 549	/* Panel fitting is currently controlled by the X code, so this is a
 550	   noop until modesetting support works fully */
 551	drm_dbg(display->drm, "Pfit is not supported\n");
 552	return ASLC_PFIT_FAILED;
 553}
 554
 555static u32 asle_set_supported_rotation_angles(struct intel_display *display, u32 srot)
 556{
 557	drm_dbg(display->drm, "SROT is not supported\n");
 558	return ASLC_ROTATION_ANGLES_FAILED;
 559}
 560
 561static u32 asle_set_button_array(struct intel_display *display, u32 iuer)
 562{
 563	if (!iuer)
 564		drm_dbg(display->drm,
 565			"Button array event is not supported (nothing)\n");
 566	if (iuer & ASLE_IUER_ROTATION_LOCK_BTN)
 567		drm_dbg(display->drm,
 568			"Button array event is not supported (rotation lock)\n");
 569	if (iuer & ASLE_IUER_VOLUME_DOWN_BTN)
 570		drm_dbg(display->drm,
 571			"Button array event is not supported (volume down)\n");
 572	if (iuer & ASLE_IUER_VOLUME_UP_BTN)
 573		drm_dbg(display->drm,
 574			"Button array event is not supported (volume up)\n");
 575	if (iuer & ASLE_IUER_WINDOWS_BTN)
 576		drm_dbg(display->drm,
 577			"Button array event is not supported (windows)\n");
 578	if (iuer & ASLE_IUER_POWER_BTN)
 579		drm_dbg(display->drm,
 580			"Button array event is not supported (power)\n");
 581
 582	return ASLC_BUTTON_ARRAY_FAILED;
 583}
 584
 585static u32 asle_set_convertible(struct intel_display *display, u32 iuer)
 586{
 587	if (iuer & ASLE_IUER_CONVERTIBLE)
 588		drm_dbg(display->drm,
 589			"Convertible is not supported (clamshell)\n");
 590	else
 591		drm_dbg(display->drm,
 592			"Convertible is not supported (slate)\n");
 593
 594	return ASLC_CONVERTIBLE_FAILED;
 595}
 596
 597static u32 asle_set_docking(struct intel_display *display, u32 iuer)
 598{
 599	if (iuer & ASLE_IUER_DOCKING)
 600		drm_dbg(display->drm, "Docking is not supported (docked)\n");
 601	else
 602		drm_dbg(display->drm,
 603			"Docking is not supported (undocked)\n");
 604
 605	return ASLC_DOCKING_FAILED;
 606}
 607
 608static u32 asle_isct_state(struct intel_display *display)
 609{
 610	drm_dbg(display->drm, "ISCT is not supported\n");
 611	return ASLC_ISCT_STATE_FAILED;
 612}
 613
 614static void asle_work(struct work_struct *work)
 615{
 616	struct intel_opregion *opregion =
 617		container_of(work, struct intel_opregion, asle_work);
 618	struct intel_display *display = opregion->display;
 619	struct opregion_asle *asle = opregion->asle;
 620	u32 aslc_stat = 0;
 621	u32 aslc_req;
 622
 623	if (!asle)
 624		return;
 625
 626	aslc_req = asle->aslc;
 627
 628	if (!(aslc_req & ASLC_REQ_MSK)) {
 629		drm_dbg(display->drm,
 630			"No request on ASLC interrupt 0x%08x\n", aslc_req);
 631		return;
 632	}
 633
 634	if (aslc_req & ASLC_SET_ALS_ILLUM)
 635		aslc_stat |= asle_set_als_illum(display, asle->alsi);
 636
 637	if (aslc_req & ASLC_SET_BACKLIGHT)
 638		aslc_stat |= asle_set_backlight(display, asle->bclp);
 639
 640	if (aslc_req & ASLC_SET_PFIT)
 641		aslc_stat |= asle_set_pfit(display, asle->pfit);
 642
 643	if (aslc_req & ASLC_SET_PWM_FREQ)
 644		aslc_stat |= asle_set_pwm_freq(display, asle->pfmb);
 645
 646	if (aslc_req & ASLC_SUPPORTED_ROTATION_ANGLES)
 647		aslc_stat |= asle_set_supported_rotation_angles(display,
 648							asle->srot);
 649
 650	if (aslc_req & ASLC_BUTTON_ARRAY)
 651		aslc_stat |= asle_set_button_array(display, asle->iuer);
 652
 653	if (aslc_req & ASLC_CONVERTIBLE_INDICATOR)
 654		aslc_stat |= asle_set_convertible(display, asle->iuer);
 655
 656	if (aslc_req & ASLC_DOCKING_INDICATOR)
 657		aslc_stat |= asle_set_docking(display, asle->iuer);
 658
 659	if (aslc_req & ASLC_ISCT_STATE_CHANGE)
 660		aslc_stat |= asle_isct_state(display);
 661
 662	asle->aslc = aslc_stat;
 663}
 664
 665bool intel_opregion_asle_present(struct intel_display *display)
 666{
 667	return display->opregion && display->opregion->asle;
 668}
 669
 670void intel_opregion_asle_intr(struct intel_display *display)
 671{
 672	struct intel_opregion *opregion = display->opregion;
 673
 674	if (opregion && opregion->asle)
 675		queue_work(display->wq.unordered, &opregion->asle_work);
 676}
 677
 678#define ACPI_EV_DISPLAY_SWITCH (1<<0)
 679#define ACPI_EV_LID            (1<<1)
 680#define ACPI_EV_DOCK           (1<<2)
 681
 682/*
 683 * The only video events relevant to opregion are 0x80. These indicate either a
 684 * docking event, lid switch or display switch request. In Linux, these are
 685 * handled by the dock, button and video drivers.
 686 */
 687static int intel_opregion_video_event(struct notifier_block *nb,
 688				      unsigned long val, void *data)
 689{
 690	struct intel_opregion *opregion = container_of(nb, struct intel_opregion,
 691						       acpi_notifier);
 692	struct acpi_bus_event *event = data;
 693	struct opregion_acpi *acpi;
 694	int ret = NOTIFY_OK;
 695
 696	if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
 697		return NOTIFY_DONE;
 698
 699	acpi = opregion->acpi;
 700
 701	if (event->type == 0x80 && ((acpi->cevt & 1) == 0))
 702		ret = NOTIFY_BAD;
 703
 704	acpi->csts = 0;
 705
 706	return ret;
 707}
 708
 709/*
 710 * Initialise the DIDL field in opregion. This passes a list of devices to
 711 * the firmware. Values are defined by section B.4.2 of the ACPI specification
 712 * (version 3)
 713 */
 714
 715static void set_did(struct intel_opregion *opregion, int i, u32 val)
 716{
 717	if (i < ARRAY_SIZE(opregion->acpi->didl)) {
 718		opregion->acpi->didl[i] = val;
 719	} else {
 720		i -= ARRAY_SIZE(opregion->acpi->didl);
 721
 722		if (WARN_ON(i >= ARRAY_SIZE(opregion->acpi->did2)))
 723			return;
 724
 725		opregion->acpi->did2[i] = val;
 726	}
 727}
 728
 729static void intel_didl_outputs(struct intel_display *display)
 730{
 731	struct intel_opregion *opregion = display->opregion;
 732	struct intel_connector *connector;
 733	struct drm_connector_list_iter conn_iter;
 734	int i = 0, max_outputs;
 735
 736	/*
 737	 * In theory, did2, the extended didl, gets added at opregion version
 738	 * 3.0. In practice, however, we're supposed to set it for earlier
 739	 * versions as well, since a BIOS that doesn't understand did2 should
 740	 * not look at it anyway. Use a variable so we can tweak this if a need
 741	 * arises later.
 742	 */
 743	max_outputs = ARRAY_SIZE(opregion->acpi->didl) +
 744		ARRAY_SIZE(opregion->acpi->did2);
 745
 746	intel_acpi_device_id_update(display);
 747
 748	drm_connector_list_iter_begin(display->drm, &conn_iter);
 749	for_each_intel_connector_iter(connector, &conn_iter) {
 750		if (i < max_outputs)
 751			set_did(opregion, i, connector->acpi_device_id);
 752		i++;
 753	}
 754	drm_connector_list_iter_end(&conn_iter);
 755
 756	drm_dbg_kms(display->drm, "%d outputs detected\n", i);
 757
 758	if (i > max_outputs)
 759		drm_err(display->drm,
 760			"More than %d outputs in connector list\n",
 761			max_outputs);
 762
 763	/* If fewer than max outputs, the list must be null terminated */
 764	if (i < max_outputs)
 765		set_did(opregion, i, 0);
 766}
 767
 768static void intel_setup_cadls(struct intel_display *display)
 769{
 770	struct intel_opregion *opregion = display->opregion;
 771	struct intel_connector *connector;
 772	struct drm_connector_list_iter conn_iter;
 773	int i = 0;
 774
 775	/*
 776	 * Initialize the CADL field from the connector device ids. This is
 777	 * essentially the same as copying from the DIDL. Technically, this is
 778	 * not always correct as display outputs may exist, but not active. This
 779	 * initialization is necessary for some Clevo laptops that check this
 780	 * field before processing the brightness and display switching hotkeys.
 781	 *
 782	 * Note that internal panels should be at the front of the connector
 783	 * list already, ensuring they're not left out.
 784	 */
 785	drm_connector_list_iter_begin(display->drm, &conn_iter);
 786	for_each_intel_connector_iter(connector, &conn_iter) {
 787		if (i >= ARRAY_SIZE(opregion->acpi->cadl))
 788			break;
 789		opregion->acpi->cadl[i++] = connector->acpi_device_id;
 790	}
 791	drm_connector_list_iter_end(&conn_iter);
 792
 793	/* If fewer than 8 active devices, the list must be null terminated */
 794	if (i < ARRAY_SIZE(opregion->acpi->cadl))
 795		opregion->acpi->cadl[i] = 0;
 796}
 797
 798static void swsci_setup(struct intel_display *display)
 799{
 800	struct intel_opregion *opregion = display->opregion;
 801	bool requested_callbacks = false;
 802	u32 tmp;
 803
 804	/* Sub-function code 0 is okay, let's allow them. */
 805	opregion->swsci_gbda_sub_functions = 1;
 806	opregion->swsci_sbcb_sub_functions = 1;
 807
 808	/* We use GBDA to ask for supported GBDA calls. */
 809	if (swsci(display, SWSCI_GBDA_SUPPORTED_CALLS, 0, &tmp) == 0) {
 810		/* make the bits match the sub-function codes */
 811		tmp <<= 1;
 812		opregion->swsci_gbda_sub_functions |= tmp;
 813	}
 814
 815	/*
 816	 * We also use GBDA to ask for _requested_ SBCB callbacks. The driver
 817	 * must not call interfaces that are not specifically requested by the
 818	 * bios.
 819	 */
 820	if (swsci(display, SWSCI_GBDA_REQUESTED_CALLBACKS, 0, &tmp) == 0) {
 821		/* here, the bits already match sub-function codes */
 822		opregion->swsci_sbcb_sub_functions |= tmp;
 823		requested_callbacks = true;
 824	}
 825
 826	/*
 827	 * But we use SBCB to ask for _supported_ SBCB calls. This does not mean
 828	 * the callback is _requested_. But we still can't call interfaces that
 829	 * are not requested.
 830	 */
 831	if (swsci(display, SWSCI_SBCB_SUPPORTED_CALLBACKS, 0, &tmp) == 0) {
 832		/* make the bits match the sub-function codes */
 833		u32 low = tmp & 0x7ff;
 834		u32 high = tmp & ~0xfff; /* bit 11 is reserved */
 835		tmp = (high << 4) | (low << 1) | 1;
 836
 837		/* best guess what to do with supported wrt requested */
 838		if (requested_callbacks) {
 839			u32 req = opregion->swsci_sbcb_sub_functions;
 840			if ((req & tmp) != req)
 841				drm_dbg(display->drm,
 842					"SWSCI BIOS requested (%08x) SBCB callbacks that are not supported (%08x)\n",
 843					req, tmp);
 844			/* XXX: for now, trust the requested callbacks */
 845			/* opregion->swsci_sbcb_sub_functions &= tmp; */
 846		} else {
 847			opregion->swsci_sbcb_sub_functions |= tmp;
 848		}
 849	}
 850
 851	drm_dbg(display->drm,
 852		"SWSCI GBDA callbacks %08x, SBCB callbacks %08x\n",
 853		opregion->swsci_gbda_sub_functions,
 854		opregion->swsci_sbcb_sub_functions);
 855}
 856
 857static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 858{
 859	DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 860		      "VBIOS ROM for %s\n", id->ident);
 861	return 1;
 862}
 863
 864static const struct dmi_system_id intel_no_opregion_vbt[] = {
 865	{
 866		.callback = intel_no_opregion_vbt_callback,
 867		.ident = "ThinkCentre A57",
 868		.matches = {
 869			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 870			DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 871		},
 872	},
 873	{ }
 874};
 875
 876int intel_opregion_setup(struct intel_display *display)
 877{
 878	struct intel_opregion *opregion;
 879	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
 880	u32 asls, mboxes;
 881	char buf[sizeof(OPREGION_SIGNATURE)];
 882	int err = 0;
 883	void *base;
 884	const void *vbt;
 885	u32 vbt_size;
 886
 887	BUILD_BUG_ON(sizeof(struct opregion_header) != 0x100);
 888	BUILD_BUG_ON(sizeof(struct opregion_acpi) != 0x100);
 889	BUILD_BUG_ON(sizeof(struct opregion_swsci) != 0x100);
 890	BUILD_BUG_ON(sizeof(struct opregion_asle) != 0x100);
 891	BUILD_BUG_ON(sizeof(struct opregion_asle_ext) != 0x400);
 892
 893	pci_read_config_dword(pdev, ASLS, &asls);
 894	drm_dbg(display->drm, "graphic opregion physical addr: 0x%x\n",
 895		asls);
 896	if (asls == 0) {
 897		drm_dbg(display->drm, "ACPI OpRegion not supported!\n");
 898		return -ENOTSUPP;
 899	}
 900
 901	opregion = kzalloc(sizeof(*opregion), GFP_KERNEL);
 902	if (!opregion)
 903		return -ENOMEM;
 904
 905	opregion->display = display;
 906	display->opregion = opregion;
 907
 908	INIT_WORK(&opregion->asle_work, asle_work);
 909
 910	base = memremap(asls, OPREGION_SIZE, MEMREMAP_WB);
 911	if (!base) {
 912		err = -ENOMEM;
 913		goto err_memremap;
 914	}
 915
 916	memcpy(buf, base, sizeof(buf));
 917
 918	if (memcmp(buf, OPREGION_SIGNATURE, 16)) {
 919		drm_dbg(display->drm, "opregion signature mismatch\n");
 920		err = -EINVAL;
 921		goto err_out;
 922	}
 923	opregion->header = base;
 924
 925	drm_dbg(display->drm, "ACPI OpRegion version %u.%u.%u\n",
 926		opregion->header->over.major,
 927		opregion->header->over.minor,
 928		opregion->header->over.revision);
 929
 930	mboxes = opregion->header->mboxes;
 931	if (mboxes & MBOX_ACPI) {
 932		drm_dbg(display->drm, "Public ACPI methods supported\n");
 933		opregion->acpi = base + OPREGION_ACPI_OFFSET;
 934		/*
 935		 * Indicate we handle monitor hotplug events ourselves so we do
 936		 * not need ACPI notifications for them. Disabling these avoids
 937		 * triggering the AML code doing the notifation, which may be
 938		 * broken as Windows also seems to disable these.
 939		 */
 940		opregion->acpi->chpd = 1;
 941	}
 942
 943	if (mboxes & MBOX_SWSCI) {
 944		u8 major = opregion->header->over.major;
 945
 946		if (major >= 3) {
 947			drm_err(display->drm, "SWSCI Mailbox #2 present for opregion v3.x, ignoring\n");
 948		} else {
 949			if (major >= 2)
 950				drm_dbg(display->drm, "SWSCI Mailbox #2 present for opregion v2.x\n");
 951			drm_dbg(display->drm, "SWSCI supported\n");
 952			opregion->swsci = base + OPREGION_SWSCI_OFFSET;
 953			swsci_setup(display);
 954		}
 955	}
 956
 957	if (mboxes & MBOX_ASLE) {
 958		drm_dbg(display->drm, "ASLE supported\n");
 959		opregion->asle = base + OPREGION_ASLE_OFFSET;
 960
 961		opregion->asle->ardy = ASLE_ARDY_NOT_READY;
 962	}
 963
 964	if (mboxes & MBOX_ASLE_EXT) {
 965		drm_dbg(display->drm, "ASLE extension supported\n");
 966		opregion->asle_ext = base + OPREGION_ASLE_EXT_OFFSET;
 967	}
 968
 969	if (mboxes & MBOX_BACKLIGHT) {
 970		drm_dbg(display->drm, "Mailbox #2 for backlight present\n");
 971	}
 972
 973	if (dmi_check_system(intel_no_opregion_vbt))
 974		goto out;
 975
 976	if (opregion->header->over.major >= 2 && opregion->asle &&
 977	    opregion->asle->rvda && opregion->asle->rvds) {
 978		resource_size_t rvda = opregion->asle->rvda;
 979
 980		/*
 981		 * opregion 2.0: rvda is the physical VBT address.
 982		 *
 983		 * opregion 2.1+: rvda is unsigned, relative offset from
 984		 * opregion base, and should never point within opregion.
 985		 */
 986		if (opregion->header->over.major > 2 ||
 987		    opregion->header->over.minor >= 1) {
 988			drm_WARN_ON(display->drm, rvda < OPREGION_SIZE);
 989
 990			rvda += asls;
 991		}
 992
 993		opregion->rvda = memremap(rvda, opregion->asle->rvds,
 994					  MEMREMAP_WB);
 995
 996		vbt = opregion->rvda;
 997		vbt_size = opregion->asle->rvds;
 998		if (intel_bios_is_valid_vbt(display, vbt, vbt_size)) {
 999			drm_dbg_kms(display->drm,
1000				    "Found valid VBT in ACPI OpRegion (RVDA)\n");
1001			opregion->vbt = vbt;
1002			opregion->vbt_size = vbt_size;
1003			goto out;
1004		} else {
1005			drm_dbg_kms(display->drm,
1006				    "Invalid VBT in ACPI OpRegion (RVDA)\n");
1007			memunmap(opregion->rvda);
1008			opregion->rvda = NULL;
1009		}
1010	}
1011
1012	vbt = base + OPREGION_VBT_OFFSET;
1013	/*
1014	 * The VBT specification says that if the ASLE ext mailbox is not used
1015	 * its area is reserved, but on some CHT boards the VBT extends into the
1016	 * ASLE ext area. Allow this even though it is against the spec, so we
1017	 * do not end up rejecting the VBT on those boards (and end up not
1018	 * finding the LCD panel because of this).
1019	 */
1020	vbt_size = (mboxes & MBOX_ASLE_EXT) ?
1021		OPREGION_ASLE_EXT_OFFSET : OPREGION_SIZE;
1022	vbt_size -= OPREGION_VBT_OFFSET;
1023	if (intel_bios_is_valid_vbt(display, vbt, vbt_size)) {
1024		drm_dbg_kms(display->drm,
1025			    "Found valid VBT in ACPI OpRegion (Mailbox #4)\n");
1026		opregion->vbt = vbt;
1027		opregion->vbt_size = vbt_size;
1028	} else {
1029		drm_dbg_kms(display->drm,
1030			    "Invalid VBT in ACPI OpRegion (Mailbox #4)\n");
1031	}
1032
1033out:
1034	return 0;
1035
1036err_out:
1037	memunmap(base);
1038err_memremap:
1039	kfree(opregion);
1040	display->opregion = NULL;
1041
1042	return err;
1043}
1044
1045static int intel_use_opregion_panel_type_callback(const struct dmi_system_id *id)
1046{
1047	DRM_INFO("Using panel type from OpRegion on %s\n", id->ident);
1048	return 1;
1049}
1050
1051static const struct dmi_system_id intel_use_opregion_panel_type[] = {
1052	{
1053		.callback = intel_use_opregion_panel_type_callback,
1054		.ident = "Conrac GmbH IX45GM2",
1055		.matches = {DMI_MATCH(DMI_SYS_VENDOR, "Conrac GmbH"),
1056			    DMI_MATCH(DMI_PRODUCT_NAME, "IX45GM2"),
1057		},
1058	},
1059	{ }
1060};
1061
1062int
1063intel_opregion_get_panel_type(struct intel_display *display)
1064{
1065	u32 panel_details;
1066	int ret;
1067
1068	ret = swsci(display, SWSCI_GBDA_PANEL_DETAILS, 0x0, &panel_details);
1069	if (ret)
1070		return ret;
1071
1072	ret = (panel_details >> 8) & 0xff;
1073	if (ret > 0x10) {
1074		drm_dbg_kms(display->drm,
1075			    "Invalid OpRegion panel type 0x%x\n", ret);
1076		return -EINVAL;
1077	}
1078
1079	/* fall back to VBT panel type? */
1080	if (ret == 0x0) {
1081		drm_dbg_kms(display->drm, "No panel type in OpRegion\n");
1082		return -ENODEV;
1083	}
1084
1085	/*
1086	 * So far we know that some machined must use it, others must not use it.
1087	 * There doesn't seem to be any way to determine which way to go, except
1088	 * via a quirk list :(
1089	 */
1090	if (!dmi_check_system(intel_use_opregion_panel_type)) {
1091		drm_dbg_kms(display->drm,
1092			    "Ignoring OpRegion panel type (%d)\n", ret - 1);
1093		return -ENODEV;
1094	}
1095
1096	return ret - 1;
1097}
1098
1099/**
1100 * intel_opregion_get_edid - Fetch EDID from ACPI OpRegion mailbox #5
1101 * @connector: eDP connector
1102 *
1103 * This reads the ACPI Opregion mailbox #5 to extract the EDID that is passed
1104 * to it.
1105 *
1106 * Returns:
1107 * The EDID in the OpRegion, or NULL if there is none or it's invalid.
1108 *
1109 */
1110const struct drm_edid *intel_opregion_get_edid(struct intel_connector *connector)
1111{
1112	struct intel_display *display = to_intel_display(connector);
1113	struct intel_opregion *opregion = display->opregion;
1114	const struct drm_edid *drm_edid;
1115	const void *edid;
1116	int len;
1117
1118	if (!opregion || !opregion->asle_ext)
1119		return NULL;
1120
1121	edid = opregion->asle_ext->bddc;
1122
1123	/* Validity corresponds to number of 128-byte blocks */
1124	len = (opregion->asle_ext->phed & ASLE_PHED_EDID_VALID_MASK) * 128;
1125	if (!len || mem_is_zero(edid, len))
1126		return NULL;
1127
1128	drm_edid = drm_edid_alloc(edid, len);
1129
1130	if (!drm_edid_valid(drm_edid)) {
1131		drm_dbg_kms(display->drm, "Invalid EDID in ACPI OpRegion (Mailbox #5)\n");
1132		drm_edid_free(drm_edid);
1133		drm_edid = NULL;
1134	}
1135
1136	return drm_edid;
1137}
1138
1139bool intel_opregion_vbt_present(struct intel_display *display)
1140{
1141	struct intel_opregion *opregion = display->opregion;
1142
1143	if (!opregion || !opregion->vbt)
1144		return false;
1145
1146	return true;
1147}
1148
1149const void *intel_opregion_get_vbt(struct intel_display *display, size_t *size)
1150{
1151	struct intel_opregion *opregion = display->opregion;
1152
1153	if (!opregion || !opregion->vbt)
1154		return NULL;
1155
1156	if (size)
1157		*size = opregion->vbt_size;
1158
1159	return kmemdup(opregion->vbt, opregion->vbt_size, GFP_KERNEL);
1160}
1161
1162bool intel_opregion_headless_sku(struct intel_display *display)
1163{
1164	struct intel_opregion *opregion = display->opregion;
1165	struct opregion_header *header;
1166
1167	if (!opregion)
1168		return false;
1169
1170	header = opregion->header;
1171
1172	if (!header || header->over.major < 2 ||
1173	    (header->over.major == 2 && header->over.minor < 3))
1174		return false;
1175
1176	return opregion->header->pcon & PCON_HEADLESS_SKU;
1177}
1178
1179void intel_opregion_register(struct intel_display *display)
1180{
1181	struct intel_opregion *opregion = display->opregion;
1182
1183	if (!opregion)
1184		return;
1185
1186	if (opregion->acpi) {
1187		opregion->acpi_notifier.notifier_call =
1188			intel_opregion_video_event;
1189		register_acpi_notifier(&opregion->acpi_notifier);
1190	}
1191
1192	intel_opregion_resume(display);
1193}
1194
1195static void intel_opregion_resume_display(struct intel_display *display)
1196{
1197	struct intel_opregion *opregion = display->opregion;
1198
1199	if (opregion->acpi) {
1200		intel_didl_outputs(display);
1201		intel_setup_cadls(display);
1202
1203		/*
1204		 * Notify BIOS we are ready to handle ACPI video ext notifs.
1205		 * Right now, all the events are handled by the ACPI video
1206		 * module. We don't actually need to do anything with them.
1207		 */
1208		opregion->acpi->csts = 0;
1209		opregion->acpi->drdy = 1;
1210	}
1211
1212	if (opregion->asle) {
1213		opregion->asle->tche = ASLE_TCHE_BLC_EN;
1214		opregion->asle->ardy = ASLE_ARDY_READY;
1215	}
1216
1217	/* Some platforms abuse the _DSM to enable MUX */
1218	intel_dsm_get_bios_data_funcs_supported(display);
1219}
1220
1221void intel_opregion_resume(struct intel_display *display)
1222{
1223	struct intel_opregion *opregion = display->opregion;
1224
1225	if (!opregion)
1226		return;
1227
1228	if (HAS_DISPLAY(display))
1229		intel_opregion_resume_display(display);
1230
1231	intel_opregion_notify_adapter(display, PCI_D0);
1232}
1233
1234static void intel_opregion_suspend_display(struct intel_display *display)
1235{
1236	struct intel_opregion *opregion = display->opregion;
1237
1238	if (opregion->asle)
1239		opregion->asle->ardy = ASLE_ARDY_NOT_READY;
1240
1241	cancel_work_sync(&opregion->asle_work);
1242
1243	if (opregion->acpi)
1244		opregion->acpi->drdy = 0;
1245}
1246
1247void intel_opregion_suspend(struct intel_display *display, pci_power_t state)
1248{
1249	struct intel_opregion *opregion = display->opregion;
1250
1251	if (!opregion)
1252		return;
1253
1254	intel_opregion_notify_adapter(display, state);
1255
1256	if (HAS_DISPLAY(display))
1257		intel_opregion_suspend_display(display);
1258}
1259
1260void intel_opregion_unregister(struct intel_display *display)
1261{
1262	struct intel_opregion *opregion = display->opregion;
1263
1264	intel_opregion_suspend(display, PCI_D1);
1265
1266	if (!opregion)
1267		return;
1268
1269	if (opregion->acpi_notifier.notifier_call) {
1270		unregister_acpi_notifier(&opregion->acpi_notifier);
1271		opregion->acpi_notifier.notifier_call = NULL;
1272	}
1273}
1274
1275void intel_opregion_cleanup(struct intel_display *display)
1276{
1277	struct intel_opregion *opregion = display->opregion;
1278
1279	if (!opregion)
1280		return;
1281
1282	memunmap(opregion->header);
1283	if (opregion->rvda)
1284		memunmap(opregion->rvda);
1285	kfree(opregion);
1286	display->opregion = NULL;
1287}
1288
1289static int intel_opregion_show(struct seq_file *m, void *unused)
1290{
1291	struct intel_display *display = m->private;
1292	struct intel_opregion *opregion = display->opregion;
1293
1294	if (opregion)
1295		seq_write(m, opregion->header, OPREGION_SIZE);
1296
1297	return 0;
1298}
1299
1300DEFINE_SHOW_ATTRIBUTE(intel_opregion);
1301
1302void intel_opregion_debugfs_register(struct intel_display *display)
1303{
1304	debugfs_create_file("i915_opregion", 0444, display->drm->debugfs_root,
1305			    display, &intel_opregion_fops);
1306}