drivers/gpu/drm/i915/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/dmi.h>
  30 #include <linux/firmware.h>
  31 #include <acpi/video.h>
  32
  33 #include <drm/drmP.h>
  34 #include <drm/i915_drm.h>
  35
  36 #include "intel_opregion.h"
  37 #include "i915_drv.h"
  38 #include "intel_drv.h"
  39
  40 #define OPREGION_HEADER_OFFSET 0
  41 #define OPREGION_ACPI_OFFSET   0x100
  42 #define   ACPI_CLID 0x01ac /* current lid state indicator */
  43 #define   ACPI_CDCK 0x01b0 /* current docking state indicator */
  44 #define OPREGION_SWSCI_OFFSET  0x200
  45 #define OPREGION_ASLE_OFFSET   0x300
  46 #define OPREGION_VBT_OFFSET    0x400
  47 #define OPREGION_ASLE_EXT_OFFSET        0x1C00
  48
  49 #define OPREGION_SIGNATURE "IntelGraphicsMem"
  50 #define MBOX_ACPI      (1<<0)
  51 #define MBOX_SWSCI     (1<<1)
  52 #define MBOX_ASLE      (1<<2)
  53 #define MBOX_ASLE_EXT  (1<<4)
  54
  55 struct opregion_header {
  56         u8 signature[16];
  57         u32 size;
  58         u32 opregion_ver;
  59         u8 bios_ver[32];
  60         u8 vbios_ver[16];
  61         u8 driver_ver[16];
  62         u32 mboxes;
  63         u32 driver_model;
  64         u32 pcon;
  65         u8 dver[32];
  66         u8 rsvd[124];
  67 } __packed;
  68
  69 /* OpRegion mailbox #1: public ACPI methods */
  70 struct opregion_acpi {
  71         u32 drdy;       /* driver readiness */
  72         u32 csts;       /* notification status */
  73         u32 cevt;       /* current event */
  74         u8 rsvd1[20];
  75         u32 didl[8];    /* supported display devices ID list */
  76         u32 cpdl[8];    /* currently presented display list */
  77         u32 cadl[8];    /* currently active display list */
  78         u32 nadl[8];    /* next active devices list */
  79         u32 aslp;       /* ASL sleep time-out */
  80         u32 tidx;       /* toggle table index */
  81         u32 chpd;       /* current hotplug enable indicator */
  82         u32 clid;       /* current lid state*/
  83         u32 cdck;       /* current docking state */
  84         u32 sxsw;       /* Sx state resume */
  85         u32 evts;       /* ASL supported events */
  86         u32 cnot;       /* current OS notification */
  87         u32 nrdy;       /* driver status */
  88         u32 did2[7];    /* extended supported display devices ID list */
  89         u32 cpd2[7];    /* extended attached display devices list */
  90         u8 rsvd2[4];
  91 } __packed;
  92
  93 /* OpRegion mailbox #2: SWSCI */
  94 struct opregion_swsci {
  95         u32 scic;       /* SWSCI command|status|data */
  96         u32 parm;       /* command parameters */
  97         u32 dslp;       /* driver sleep time-out */
  98         u8 rsvd[244];
  99 } __packed;
 100
 101 /* OpRegion mailbox #3: ASLE */
 102 struct opregion_asle {
 103         u32 ardy;       /* driver readiness */
 104         u32 aslc;       /* ASLE interrupt command */
 105         u32 tche;       /* technology enabled indicator */
 106         u32 alsi;       /* current ALS illuminance reading */
 107         u32 bclp;       /* backlight brightness to set */
 108         u32 pfit;       /* panel fitting state */
 109         u32 cblv;       /* current brightness level */
 110         u16 bclm[20];   /* backlight level duty cycle mapping table */
 111         u32 cpfm;       /* current panel fitting mode */
 112         u32 epfm;       /* enabled panel fitting modes */
 113         u8 plut[74];    /* panel LUT and identifier */
 114         u32 pfmb;       /* PWM freq and min brightness */
 115         u32 cddv;       /* color correction default values */
 116         u32 pcft;       /* power conservation features */
 117         u32 srot;       /* supported rotation angles */
 118         u32 iuer;       /* IUER events */
 119         u64 fdss;
 120         u32 fdsp;
 121         u32 stat;
 122         u64 rvda;       /* Physical address of raw vbt data */
 123         u32 rvds;       /* Size of raw vbt data */
 124         u8 rsvd[58];
 125 } __packed;
 126
 127 /* OpRegion mailbox #5: ASLE ext */
 128 struct opregion_asle_ext {
 129         u32 phed;       /* Panel Header */
 130         u8 bddc[256];   /* Panel EDID */
 131         u8 rsvd[764];
 132 } __packed;
 133
 134 /* Driver readiness indicator */
 135 #define ASLE_ARDY_READY         (1 << 0)
 136 #define ASLE_ARDY_NOT_READY     (0 << 0)
 137
 138 /* ASLE Interrupt Command (ASLC) bits */
 139 #define ASLC_SET_ALS_ILLUM              (1 << 0)
 140 #define ASLC_SET_BACKLIGHT              (1 << 1)
 141 #define ASLC_SET_PFIT                   (1 << 2)
 142 #define ASLC_SET_PWM_FREQ               (1 << 3)
 143 #define ASLC_SUPPORTED_ROTATION_ANGLES  (1 << 4)
 144 #define ASLC_BUTTON_ARRAY               (1 << 5)
 145 #define ASLC_CONVERTIBLE_INDICATOR      (1 << 6)
 146 #define ASLC_DOCKING_INDICATOR          (1 << 7)
 147 #define ASLC_ISCT_STATE_CHANGE          (1 << 8)
 148 #define ASLC_REQ_MSK                    0x1ff
 149 /* response bits */
 150 #define ASLC_ALS_ILLUM_FAILED           (1 << 10)
 151 #define ASLC_BACKLIGHT_FAILED           (1 << 12)
 152 #define ASLC_PFIT_FAILED                (1 << 14)
 153 #define ASLC_PWM_FREQ_FAILED            (1 << 16)
 154 #define ASLC_ROTATION_ANGLES_FAILED     (1 << 18)
 155 #define ASLC_BUTTON_ARRAY_FAILED        (1 << 20)
 156 #define ASLC_CONVERTIBLE_FAILED         (1 << 22)
 157 #define ASLC_DOCKING_FAILED             (1 << 24)
 158 #define ASLC_ISCT_STATE_FAILED          (1 << 26)
 159
 160 /* Technology enabled indicator */
 161 #define ASLE_TCHE_ALS_EN        (1 << 0)
 162 #define ASLE_TCHE_BLC_EN        (1 << 1)
 163 #define ASLE_TCHE_PFIT_EN       (1 << 2)
 164 #define ASLE_TCHE_PFMB_EN       (1 << 3)
 165
 166 /* ASLE backlight brightness to set */
 167 #define ASLE_BCLP_VALID                (1<<31)
 168 #define ASLE_BCLP_MSK          (~(1<<31))
 169
 170 /* ASLE panel fitting request */
 171 #define ASLE_PFIT_VALID         (1<<31)
 172 #define ASLE_PFIT_CENTER (1<<0)
 173 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
 174 #define ASLE_PFIT_STRETCH_GFX (1<<2)
 175
 176 /* PWM frequency and minimum brightness */
 177 #define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
 178 #define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
 179 #define ASLE_PFMB_PWM_MASK (0x7ffffe00)
 180 #define ASLE_PFMB_PWM_VALID (1<<31)
 181
 182 #define ASLE_CBLV_VALID         (1<<31)
 183
 184 /* IUER */
 185 #define ASLE_IUER_DOCKING               (1 << 7)
 186 #define ASLE_IUER_CONVERTIBLE           (1 << 6)
 187 #define ASLE_IUER_ROTATION_LOCK_BTN     (1 << 4)
 188 #define ASLE_IUER_VOLUME_DOWN_BTN       (1 << 3)
 189 #define ASLE_IUER_VOLUME_UP_BTN         (1 << 2)
 190 #define ASLE_IUER_WINDOWS_BTN           (1 << 1)
 191 #define ASLE_IUER_POWER_BTN             (1 << 0)
 192
 193 /* Software System Control Interrupt (SWSCI) */
 194 #define SWSCI_SCIC_INDICATOR            (1 << 0)
 195 #define SWSCI_SCIC_MAIN_FUNCTION_SHIFT  1
 196 #define SWSCI_SCIC_MAIN_FUNCTION_MASK   (0xf << 1)
 197 #define SWSCI_SCIC_SUB_FUNCTION_SHIFT   8
 198 #define SWSCI_SCIC_SUB_FUNCTION_MASK    (0xff << 8)
 199 #define SWSCI_SCIC_EXIT_PARAMETER_SHIFT 8
 200 #define SWSCI_SCIC_EXIT_PARAMETER_MASK  (0xff << 8)
 201 #define SWSCI_SCIC_EXIT_STATUS_SHIFT    5
 202 #define SWSCI_SCIC_EXIT_STATUS_MASK     (7 << 5)
 203 #define SWSCI_SCIC_EXIT_STATUS_SUCCESS  1
 204
 205 #define SWSCI_FUNCTION_CODE(main, sub) \
 206         ((main) << SWSCI_SCIC_MAIN_FUNCTION_SHIFT | \
 207          (sub) << SWSCI_SCIC_SUB_FUNCTION_SHIFT)
 208
 209 /* SWSCI: Get BIOS Data (GBDA) */
 210 #define SWSCI_GBDA                      4
 211 #define SWSCI_GBDA_SUPPORTED_CALLS      SWSCI_FUNCTION_CODE(SWSCI_GBDA, 0)
 212 #define SWSCI_GBDA_REQUESTED_CALLBACKS  SWSCI_FUNCTION_CODE(SWSCI_GBDA, 1)
 213 #define SWSCI_GBDA_BOOT_DISPLAY_PREF    SWSCI_FUNCTION_CODE(SWSCI_GBDA, 4)
 214 #define SWSCI_GBDA_PANEL_DETAILS        SWSCI_FUNCTION_CODE(SWSCI_GBDA, 5)
 215 #define SWSCI_GBDA_TV_STANDARD          SWSCI_FUNCTION_CODE(SWSCI_GBDA, 6)
 216 #define SWSCI_GBDA_INTERNAL_GRAPHICS    SWSCI_FUNCTION_CODE(SWSCI_GBDA, 7)
 217 #define SWSCI_GBDA_SPREAD_SPECTRUM      SWSCI_FUNCTION_CODE(SWSCI_GBDA, 10)
 218
 219 /* SWSCI: System BIOS Callbacks (SBCB) */
 220 #define SWSCI_SBCB                      6
 221 #define SWSCI_SBCB_SUPPORTED_CALLBACKS  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 0)
 222 #define SWSCI_SBCB_INIT_COMPLETION      SWSCI_FUNCTION_CODE(SWSCI_SBCB, 1)
 223 #define SWSCI_SBCB_PRE_HIRES_SET_MODE   SWSCI_FUNCTION_CODE(SWSCI_SBCB, 3)
 224 #define SWSCI_SBCB_POST_HIRES_SET_MODE  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 4)
 225 #define SWSCI_SBCB_DISPLAY_SWITCH       SWSCI_FUNCTION_CODE(SWSCI_SBCB, 5)
 226 #define SWSCI_SBCB_SET_TV_FORMAT        SWSCI_FUNCTION_CODE(SWSCI_SBCB, 6)
 227 #define SWSCI_SBCB_ADAPTER_POWER_STATE  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 7)
 228 #define SWSCI_SBCB_DISPLAY_POWER_STATE  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 8)
 229 #define SWSCI_SBCB_SET_BOOT_DISPLAY     SWSCI_FUNCTION_CODE(SWSCI_SBCB, 9)
 230 #define SWSCI_SBCB_SET_PANEL_DETAILS    SWSCI_FUNCTION_CODE(SWSCI_SBCB, 10)
 231 #define SWSCI_SBCB_SET_INTERNAL_GFX     SWSCI_FUNCTION_CODE(SWSCI_SBCB, 11)
 232 #define SWSCI_SBCB_POST_HIRES_TO_DOS_FS SWSCI_FUNCTION_CODE(SWSCI_SBCB, 16)
 233 #define SWSCI_SBCB_SUSPEND_RESUME       SWSCI_FUNCTION_CODE(SWSCI_SBCB, 17)
 234 #define SWSCI_SBCB_SET_SPREAD_SPECTRUM  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 18)
 235 #define SWSCI_SBCB_POST_VBE_PM          SWSCI_FUNCTION_CODE(SWSCI_SBCB, 19)
 236 #define SWSCI_SBCB_ENABLE_DISABLE_AUDIO SWSCI_FUNCTION_CODE(SWSCI_SBCB, 21)
 237
 238 /*
 239  * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
 240  * Attached to the Display Adapter).
 241  */
 242 #define ACPI_DISPLAY_INDEX_SHIFT                0
 243 #define ACPI_DISPLAY_INDEX_MASK                 (0xf << 0)
 244 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT      4
 245 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK       (0xf << 4)
 246 #define ACPI_DISPLAY_TYPE_SHIFT                 8
 247 #define ACPI_DISPLAY_TYPE_MASK                  (0xf << 8)
 248 #define ACPI_DISPLAY_TYPE_OTHER                 (0 << 8)
 249 #define ACPI_DISPLAY_TYPE_VGA                   (1 << 8)
 250 #define ACPI_DISPLAY_TYPE_TV                    (2 << 8)
 251 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL      (3 << 8)
 252 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL      (4 << 8)
 253 #define ACPI_VENDOR_SPECIFIC_SHIFT              12
 254 #define ACPI_VENDOR_SPECIFIC_MASK               (0xf << 12)
 255 #define ACPI_BIOS_CAN_DETECT                    (1 << 16)
 256 #define ACPI_DEPENDS_ON_VGA                     (1 << 17)
 257 #define ACPI_PIPE_ID_SHIFT                      18
 258 #define ACPI_PIPE_ID_MASK                       (7 << 18)
 259 #define ACPI_DEVICE_ID_SCHEME                   (1 << 31)
 260
 261 #define MAX_DSLP        1500
 262
 263 static int swsci(struct drm_i915_private *dev_priv,
 264                  u32 function, u32 parm, u32 *parm_out)
 265 {
 266         struct opregion_swsci *swsci = dev_priv->opregion.swsci;
 267         struct pci_dev *pdev = dev_priv->drm.pdev;
 268         u32 main_function, sub_function, scic;
 269         u16 swsci_val;
 270         u32 dslp;
 271
 272         if (!swsci)
 273                 return -ENODEV;
 274
 275         main_function = (function & SWSCI_SCIC_MAIN_FUNCTION_MASK) >>
 276                 SWSCI_SCIC_MAIN_FUNCTION_SHIFT;
 277         sub_function = (function & SWSCI_SCIC_SUB_FUNCTION_MASK) >>
 278                 SWSCI_SCIC_SUB_FUNCTION_SHIFT;
 279
 280         /* Check if we can call the function. See swsci_setup for details. */
 281         if (main_function == SWSCI_SBCB) {
 282                 if ((dev_priv->opregion.swsci_sbcb_sub_functions &
 283                      (1 << sub_function)) == 0)
 284                         return -EINVAL;
 285         } else if (main_function == SWSCI_GBDA) {
 286                 if ((dev_priv->opregion.swsci_gbda_sub_functions &
 287                      (1 << sub_function)) == 0)
 288                         return -EINVAL;
 289         }
 290
 291         /* Driver sleep timeout in ms. */
 292         dslp = swsci->dslp;
 293         if (!dslp) {
 294                 /* The spec says 2ms should be the default, but it's too small
 295                  * for some machines. */
 296                 dslp = 50;
 297         } else if (dslp > MAX_DSLP) {
 298                 /* Hey bios, trust must be earned. */
 299                 DRM_INFO_ONCE("ACPI BIOS requests an excessive sleep of %u ms, "
 300                               "using %u ms instead\n", dslp, MAX_DSLP);
 301                 dslp = MAX_DSLP;
 302         }
 303
 304         /* The spec tells us to do this, but we are the only user... */
 305         scic = swsci->scic;
 306         if (scic & SWSCI_SCIC_INDICATOR) {
 307                 DRM_DEBUG_DRIVER("SWSCI request already in progress\n");
 308                 return -EBUSY;
 309         }
 310
 311         scic = function | SWSCI_SCIC_INDICATOR;
 312
 313         swsci->parm = parm;
 314         swsci->scic = scic;
 315
 316         /* Ensure SCI event is selected and event trigger is cleared. */
 317         pci_read_config_word(pdev, SWSCI, &swsci_val);
 318         if (!(swsci_val & SWSCI_SCISEL) || (swsci_val & SWSCI_GSSCIE)) {
 319                 swsci_val |= SWSCI_SCISEL;
 320                 swsci_val &= ~SWSCI_GSSCIE;
 321                 pci_write_config_word(pdev, SWSCI, swsci_val);
 322         }
 323
 324         /* Use event trigger to tell bios to check the mail. */
 325         swsci_val |= SWSCI_GSSCIE;
 326         pci_write_config_word(pdev, SWSCI, swsci_val);
 327
 328         /* Poll for the result. */
 329 #define C (((scic = swsci->scic) & SWSCI_SCIC_INDICATOR) == 0)
 330         if (wait_for(C, dslp)) {
 331                 DRM_DEBUG_DRIVER("SWSCI request timed out\n");
 332                 return -ETIMEDOUT;
 333         }
 334
 335         scic = (scic & SWSCI_SCIC_EXIT_STATUS_MASK) >>
 336                 SWSCI_SCIC_EXIT_STATUS_SHIFT;
 337
 338         /* Note: scic == 0 is an error! */
 339         if (scic != SWSCI_SCIC_EXIT_STATUS_SUCCESS) {
 340                 DRM_DEBUG_DRIVER("SWSCI request error %u\n", scic);
 341                 return -EIO;
 342         }
 343
 344         if (parm_out)
 345                 *parm_out = swsci->parm;
 346
 347         return 0;
 348
 349 #undef C
 350 }
 351
 352 #define DISPLAY_TYPE_CRT                        0
 353 #define DISPLAY_TYPE_TV                         1
 354 #define DISPLAY_TYPE_EXTERNAL_FLAT_PANEL        2
 355 #define DISPLAY_TYPE_INTERNAL_FLAT_PANEL        3
 356
 357 int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
 358                                   bool enable)
 359 {
 360         struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
 361         u32 parm = 0;
 362         u32 type = 0;
 363         u32 port;
 364
 365         /* don't care about old stuff for now */
 366         if (!HAS_DDI(dev_priv))
 367                 return 0;
 368
 369         if (intel_encoder->type == INTEL_OUTPUT_DSI)
 370                 port = 0;
 371         else
 372                 port = intel_encoder->port;
 373
 374         if (port == PORT_E)  {
 375                 port = 0;
 376         } else {
 377                 parm |= 1 << port;
 378                 port++;
 379         }
 380
 381         if (!enable)
 382                 parm |= 4 << 8;
 383
 384         switch (intel_encoder->type) {
 385         case INTEL_OUTPUT_ANALOG:
 386                 type = DISPLAY_TYPE_CRT;
 387                 break;
 388         case INTEL_OUTPUT_DDI:
 389         case INTEL_OUTPUT_DP:
 390         case INTEL_OUTPUT_HDMI:
 391         case INTEL_OUTPUT_DP_MST:
 392                 type = DISPLAY_TYPE_EXTERNAL_FLAT_PANEL;
 393                 break;
 394         case INTEL_OUTPUT_EDP:
 395         case INTEL_OUTPUT_DSI:
 396                 type = DISPLAY_TYPE_INTERNAL_FLAT_PANEL;
 397                 break;
 398         default:
 399                 WARN_ONCE(1, "unsupported intel_encoder type %d\n",
 400                           intel_encoder->type);
 401                 return -EINVAL;
 402         }
 403
 404         parm |= type << (16 + port * 3);
 405
 406         return swsci(dev_priv, SWSCI_SBCB_DISPLAY_POWER_STATE, parm, NULL);
 407 }
 408
 409 static const struct {
 410         pci_power_t pci_power_state;
 411         u32 parm;
 412 } power_state_map[] = {
 413         { PCI_D0,       0x00 },
 414         { PCI_D1,       0x01 },
 415         { PCI_D2,       0x02 },
 416         { PCI_D3hot,    0x04 },
 417         { PCI_D3cold,   0x04 },
 418 };
 419
 420 int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv,
 421                                   pci_power_t state)
 422 {
 423         int i;
 424
 425         if (!HAS_DDI(dev_priv))
 426                 return 0;
 427
 428         for (i = 0; i < ARRAY_SIZE(power_state_map); i++) {
 429                 if (state == power_state_map[i].pci_power_state)
 430                         return swsci(dev_priv, SWSCI_SBCB_ADAPTER_POWER_STATE,
 431                                      power_state_map[i].parm, NULL);
 432         }
 433
 434         return -EINVAL;
 435 }
 436
 437 static u32 asle_set_backlight(struct drm_i915_private *dev_priv, u32 bclp)
 438 {
 439         struct intel_connector *connector;
 440         struct drm_connector_list_iter conn_iter;
 441         struct opregion_asle *asle = dev_priv->opregion.asle;
 442         struct drm_device *dev = &dev_priv->drm;
 443
 444         DRM_DEBUG_DRIVER("bclp = 0x%08x\n", bclp);
 445
 446         if (acpi_video_get_backlight_type() == acpi_backlight_native) {
 447                 DRM_DEBUG_KMS("opregion backlight request ignored\n");
 448                 return 0;
 449         }
 450
 451         if (!(bclp & ASLE_BCLP_VALID))
 452                 return ASLC_BACKLIGHT_FAILED;
 453
 454         bclp &= ASLE_BCLP_MSK;
 455         if (bclp > 255)
 456                 return ASLC_BACKLIGHT_FAILED;
 457
 458         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 459
 460         /*
 461          * Update backlight on all connectors that support backlight (usually
 462          * only one).
 463          */
 464         DRM_DEBUG_KMS("updating opregion backlight %d/255\n", bclp);
 465         drm_connector_list_iter_begin(dev, &conn_iter);
 466         for_each_intel_connector_iter(connector, &conn_iter)
 467                 intel_panel_set_backlight_acpi(connector->base.state, bclp, 255);
 468         drm_connector_list_iter_end(&conn_iter);
 469         asle->cblv = DIV_ROUND_UP(bclp * 100, 255) | ASLE_CBLV_VALID;
 470
 471         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 472
 473
 474         return 0;
 475 }
 476
 477 static u32 asle_set_als_illum(struct drm_i915_private *dev_priv, u32 alsi)
 478 {
 479         /* alsi is the current ALS reading in lux. 0 indicates below sensor
 480            range, 0xffff indicates above sensor range. 1-0xfffe are valid */
 481         DRM_DEBUG_DRIVER("Illum is not supported\n");
 482         return ASLC_ALS_ILLUM_FAILED;
 483 }
 484
 485 static u32 asle_set_pwm_freq(struct drm_i915_private *dev_priv, u32 pfmb)
 486 {
 487         DRM_DEBUG_DRIVER("PWM freq is not supported\n");
 488         return ASLC_PWM_FREQ_FAILED;
 489 }
 490
 491 static u32 asle_set_pfit(struct drm_i915_private *dev_priv, u32 pfit)
 492 {
 493         /* Panel fitting is currently controlled by the X code, so this is a
 494            noop until modesetting support works fully */
 495         DRM_DEBUG_DRIVER("Pfit is not supported\n");
 496         return ASLC_PFIT_FAILED;
 497 }
 498
 499 static u32 asle_set_supported_rotation_angles(struct drm_i915_private *dev_priv, u32 srot)
 500 {
 501         DRM_DEBUG_DRIVER("SROT is not supported\n");
 502         return ASLC_ROTATION_ANGLES_FAILED;
 503 }
 504
 505 static u32 asle_set_button_array(struct drm_i915_private *dev_priv, u32 iuer)
 506 {
 507         if (!iuer)
 508                 DRM_DEBUG_DRIVER("Button array event is not supported (nothing)\n");
 509         if (iuer & ASLE_IUER_ROTATION_LOCK_BTN)
 510                 DRM_DEBUG_DRIVER("Button array event is not supported (rotation lock)\n");
 511         if (iuer & ASLE_IUER_VOLUME_DOWN_BTN)
 512                 DRM_DEBUG_DRIVER("Button array event is not supported (volume down)\n");
 513         if (iuer & ASLE_IUER_VOLUME_UP_BTN)
 514                 DRM_DEBUG_DRIVER("Button array event is not supported (volume up)\n");
 515         if (iuer & ASLE_IUER_WINDOWS_BTN)
 516                 DRM_DEBUG_DRIVER("Button array event is not supported (windows)\n");
 517         if (iuer & ASLE_IUER_POWER_BTN)
 518                 DRM_DEBUG_DRIVER("Button array event is not supported (power)\n");
 519
 520         return ASLC_BUTTON_ARRAY_FAILED;
 521 }
 522
 523 static u32 asle_set_convertible(struct drm_i915_private *dev_priv, u32 iuer)
 524 {
 525         if (iuer & ASLE_IUER_CONVERTIBLE)
 526                 DRM_DEBUG_DRIVER("Convertible is not supported (clamshell)\n");
 527         else
 528                 DRM_DEBUG_DRIVER("Convertible is not supported (slate)\n");
 529
 530         return ASLC_CONVERTIBLE_FAILED;
 531 }
 532
 533 static u32 asle_set_docking(struct drm_i915_private *dev_priv, u32 iuer)
 534 {
 535         if (iuer & ASLE_IUER_DOCKING)
 536                 DRM_DEBUG_DRIVER("Docking is not supported (docked)\n");
 537         else
 538                 DRM_DEBUG_DRIVER("Docking is not supported (undocked)\n");
 539
 540         return ASLC_DOCKING_FAILED;
 541 }
 542
 543 static u32 asle_isct_state(struct drm_i915_private *dev_priv)
 544 {
 545         DRM_DEBUG_DRIVER("ISCT is not supported\n");
 546         return ASLC_ISCT_STATE_FAILED;
 547 }
 548
 549 static void asle_work(struct work_struct *work)
 550 {
 551         struct intel_opregion *opregion =
 552                 container_of(work, struct intel_opregion, asle_work);
 553         struct drm_i915_private *dev_priv =
 554                 container_of(opregion, struct drm_i915_private, opregion);
 555         struct opregion_asle *asle = dev_priv->opregion.asle;
 556         u32 aslc_stat = 0;
 557         u32 aslc_req;
 558
 559         if (!asle)
 560                 return;
 561
 562         aslc_req = asle->aslc;
 563
 564         if (!(aslc_req & ASLC_REQ_MSK)) {
 565                 DRM_DEBUG_DRIVER("No request on ASLC interrupt 0x%08x\n",
 566                                  aslc_req);
 567                 return;
 568         }
 569
 570         if (aslc_req & ASLC_SET_ALS_ILLUM)
 571                 aslc_stat |= asle_set_als_illum(dev_priv, asle->alsi);
 572
 573         if (aslc_req & ASLC_SET_BACKLIGHT)
 574                 aslc_stat |= asle_set_backlight(dev_priv, asle->bclp);
 575
 576         if (aslc_req & ASLC_SET_PFIT)
 577                 aslc_stat |= asle_set_pfit(dev_priv, asle->pfit);
 578
 579         if (aslc_req & ASLC_SET_PWM_FREQ)
 580                 aslc_stat |= asle_set_pwm_freq(dev_priv, asle->pfmb);
 581
 582         if (aslc_req & ASLC_SUPPORTED_ROTATION_ANGLES)
 583                 aslc_stat |= asle_set_supported_rotation_angles(dev_priv,
 584                                                         asle->srot);
 585
 586         if (aslc_req & ASLC_BUTTON_ARRAY)
 587                 aslc_stat |= asle_set_button_array(dev_priv, asle->iuer);
 588
 589         if (aslc_req & ASLC_CONVERTIBLE_INDICATOR)
 590                 aslc_stat |= asle_set_convertible(dev_priv, asle->iuer);
 591
 592         if (aslc_req & ASLC_DOCKING_INDICATOR)
 593                 aslc_stat |= asle_set_docking(dev_priv, asle->iuer);
 594
 595         if (aslc_req & ASLC_ISCT_STATE_CHANGE)
 596                 aslc_stat |= asle_isct_state(dev_priv);
 597
 598         asle->aslc = aslc_stat;
 599 }
 600
 601 void intel_opregion_asle_intr(struct drm_i915_private *dev_priv)
 602 {
 603         if (dev_priv->opregion.asle)
 604                 schedule_work(&dev_priv->opregion.asle_work);
 605 }
 606
 607 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
 608 #define ACPI_EV_LID            (1<<1)
 609 #define ACPI_EV_DOCK           (1<<2)
 610
 611 static struct intel_opregion *system_opregion;
 612
 613 static int intel_opregion_video_event(struct notifier_block *nb,
 614                                       unsigned long val, void *data)
 615 {
 616         /* The only video events relevant to opregion are 0x80. These indicate
 617            either a docking event, lid switch or display switch request. In
 618            Linux, these are handled by the dock, button and video drivers.
 619         */
 620
 621         struct acpi_bus_event *event = data;
 622         struct opregion_acpi *acpi;
 623         int ret = NOTIFY_OK;
 624
 625         if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
 626                 return NOTIFY_DONE;
 627
 628         if (!system_opregion)
 629                 return NOTIFY_DONE;
 630
 631         acpi = system_opregion->acpi;
 632
 633         if (event->type == 0x80 && ((acpi->cevt & 1) == 0))
 634                 ret = NOTIFY_BAD;
 635
 636         acpi->csts = 0;
 637
 638         return ret;
 639 }
 640
 641 static struct notifier_block intel_opregion_notifier = {
 642         .notifier_call = intel_opregion_video_event,
 643 };
 644
 645 /*
 646  * Initialise the DIDL field in opregion. This passes a list of devices to
 647  * the firmware. Values are defined by section B.4.2 of the ACPI specification
 648  * (version 3)
 649  */
 650
 651 static void set_did(struct intel_opregion *opregion, int i, u32 val)
 652 {
 653         if (i < ARRAY_SIZE(opregion->acpi->didl)) {
 654                 opregion->acpi->didl[i] = val;
 655         } else {
 656                 i -= ARRAY_SIZE(opregion->acpi->didl);
 657
 658                 if (WARN_ON(i >= ARRAY_SIZE(opregion->acpi->did2)))
 659                         return;
 660
 661                 opregion->acpi->did2[i] = val;
 662         }
 663 }
 664
 665 static u32 acpi_display_type(struct intel_connector *connector)
 666 {
 667         u32 display_type;
 668
 669         switch (connector->base.connector_type) {
 670         case DRM_MODE_CONNECTOR_VGA:
 671         case DRM_MODE_CONNECTOR_DVIA:
 672                 display_type = ACPI_DISPLAY_TYPE_VGA;
 673                 break;
 674         case DRM_MODE_CONNECTOR_Composite:
 675         case DRM_MODE_CONNECTOR_SVIDEO:
 676         case DRM_MODE_CONNECTOR_Component:
 677         case DRM_MODE_CONNECTOR_9PinDIN:
 678         case DRM_MODE_CONNECTOR_TV:
 679                 display_type = ACPI_DISPLAY_TYPE_TV;
 680                 break;
 681         case DRM_MODE_CONNECTOR_DVII:
 682         case DRM_MODE_CONNECTOR_DVID:
 683         case DRM_MODE_CONNECTOR_DisplayPort:
 684         case DRM_MODE_CONNECTOR_HDMIA:
 685         case DRM_MODE_CONNECTOR_HDMIB:
 686                 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
 687                 break;
 688         case DRM_MODE_CONNECTOR_LVDS:
 689         case DRM_MODE_CONNECTOR_eDP:
 690         case DRM_MODE_CONNECTOR_DSI:
 691                 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
 692                 break;
 693         case DRM_MODE_CONNECTOR_Unknown:
 694         case DRM_MODE_CONNECTOR_VIRTUAL:
 695                 display_type = ACPI_DISPLAY_TYPE_OTHER;
 696                 break;
 697         default:
 698                 MISSING_CASE(connector->base.connector_type);
 699                 display_type = ACPI_DISPLAY_TYPE_OTHER;
 700                 break;
 701         }
 702
 703         return display_type;
 704 }
 705
 706 static void intel_didl_outputs(struct drm_i915_private *dev_priv)
 707 {
 708         struct intel_opregion *opregion = &dev_priv->opregion;
 709         struct intel_connector *connector;
 710         struct drm_connector_list_iter conn_iter;
 711         int i = 0, max_outputs;
 712         int display_index[16] = {};
 713
 714         /*
 715          * In theory, did2, the extended didl, gets added at opregion version
 716          * 3.0. In practice, however, we're supposed to set it for earlier
 717          * versions as well, since a BIOS that doesn't understand did2 should
 718          * not look at it anyway. Use a variable so we can tweak this if a need
 719          * arises later.
 720          */
 721         max_outputs = ARRAY_SIZE(opregion->acpi->didl) +
 722                 ARRAY_SIZE(opregion->acpi->did2);
 723
 724         drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
 725         for_each_intel_connector_iter(connector, &conn_iter) {
 726                 u32 device_id, type;
 727
 728                 device_id = acpi_display_type(connector);
 729
 730                 /* Use display type specific display index. */
 731                 type = (device_id & ACPI_DISPLAY_TYPE_MASK)
 732                         >> ACPI_DISPLAY_TYPE_SHIFT;
 733                 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
 734
 735                 connector->acpi_device_id = device_id;
 736                 if (i < max_outputs)
 737                         set_did(opregion, i, device_id);
 738                 i++;
 739         }
 740         drm_connector_list_iter_end(&conn_iter);
 741
 742         DRM_DEBUG_KMS("%d outputs detected\n", i);
 743
 744         if (i > max_outputs)
 745                 DRM_ERROR("More than %d outputs in connector list\n",
 746                           max_outputs);
 747
 748         /* If fewer than max outputs, the list must be null terminated */
 749         if (i < max_outputs)
 750                 set_did(opregion, i, 0);
 751 }
 752
 753 static void intel_setup_cadls(struct drm_i915_private *dev_priv)
 754 {
 755         struct intel_opregion *opregion = &dev_priv->opregion;
 756         struct intel_connector *connector;
 757         struct drm_connector_list_iter conn_iter;
 758         int i = 0;
 759
 760         /*
 761          * Initialize the CADL field from the connector device ids. This is
 762          * essentially the same as copying from the DIDL. Technically, this is
 763          * not always correct as display outputs may exist, but not active. This
 764          * initialization is necessary for some Clevo laptops that check this
 765          * field before processing the brightness and display switching hotkeys.
 766          *
 767          * Note that internal panels should be at the front of the connector
 768          * list already, ensuring they're not left out.
 769          */
 770         drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
 771         for_each_intel_connector_iter(connector, &conn_iter) {
 772                 if (i >= ARRAY_SIZE(opregion->acpi->cadl))
 773                         break;
 774                 opregion->acpi->cadl[i++] = connector->acpi_device_id;
 775         }
 776         drm_connector_list_iter_end(&conn_iter);
 777
 778         /* If fewer than 8 active devices, the list must be null terminated */
 779         if (i < ARRAY_SIZE(opregion->acpi->cadl))
 780                 opregion->acpi->cadl[i] = 0;
 781 }
 782
 783 void intel_opregion_register(struct drm_i915_private *dev_priv)
 784 {
 785         struct intel_opregion *opregion = &dev_priv->opregion;
 786
 787         if (!opregion->header)
 788                 return;
 789
 790         if (opregion->acpi) {
 791                 intel_didl_outputs(dev_priv);
 792                 intel_setup_cadls(dev_priv);
 793
 794                 /* Notify BIOS we are ready to handle ACPI video ext notifs.
 795                  * Right now, all the events are handled by the ACPI video module.
 796                  * We don't actually need to do anything with them. */
 797                 opregion->acpi->csts = 0;
 798                 opregion->acpi->drdy = 1;
 799
 800                 system_opregion = opregion;
 801                 register_acpi_notifier(&intel_opregion_notifier);
 802         }
 803
 804         if (opregion->asle) {
 805                 opregion->asle->tche = ASLE_TCHE_BLC_EN;
 806                 opregion->asle->ardy = ASLE_ARDY_READY;
 807         }
 808 }
 809
 810 void intel_opregion_unregister(struct drm_i915_private *dev_priv)
 811 {
 812         struct intel_opregion *opregion = &dev_priv->opregion;
 813
 814         if (!opregion->header)
 815                 return;
 816
 817         if (opregion->asle)
 818                 opregion->asle->ardy = ASLE_ARDY_NOT_READY;
 819
 820         cancel_work_sync(&dev_priv->opregion.asle_work);
 821
 822         if (opregion->acpi) {
 823                 opregion->acpi->drdy = 0;
 824
 825                 system_opregion = NULL;
 826                 unregister_acpi_notifier(&intel_opregion_notifier);
 827         }
 828
 829         /* just clear all opregion memory pointers now */
 830         memunmap(opregion->header);
 831         if (opregion->rvda) {
 832                 memunmap(opregion->rvda);
 833                 opregion->rvda = NULL;
 834         }
 835         if (opregion->vbt_firmware) {
 836                 kfree(opregion->vbt_firmware);
 837                 opregion->vbt_firmware = NULL;
 838         }
 839         opregion->header = NULL;
 840         opregion->acpi = NULL;
 841         opregion->swsci = NULL;
 842         opregion->asle = NULL;
 843         opregion->vbt = NULL;
 844         opregion->lid_state = NULL;
 845 }
 846
 847 static void swsci_setup(struct drm_i915_private *dev_priv)
 848 {
 849         struct intel_opregion *opregion = &dev_priv->opregion;
 850         bool requested_callbacks = false;
 851         u32 tmp;
 852
 853         /* Sub-function code 0 is okay, let's allow them. */
 854         opregion->swsci_gbda_sub_functions = 1;
 855         opregion->swsci_sbcb_sub_functions = 1;
 856
 857         /* We use GBDA to ask for supported GBDA calls. */
 858         if (swsci(dev_priv, SWSCI_GBDA_SUPPORTED_CALLS, 0, &tmp) == 0) {
 859                 /* make the bits match the sub-function codes */
 860                 tmp <<= 1;
 861                 opregion->swsci_gbda_sub_functions |= tmp;
 862         }
 863
 864         /*
 865          * We also use GBDA to ask for _requested_ SBCB callbacks. The driver
 866          * must not call interfaces that are not specifically requested by the
 867          * bios.
 868          */
 869         if (swsci(dev_priv, SWSCI_GBDA_REQUESTED_CALLBACKS, 0, &tmp) == 0) {
 870                 /* here, the bits already match sub-function codes */
 871                 opregion->swsci_sbcb_sub_functions |= tmp;
 872                 requested_callbacks = true;
 873         }
 874
 875         /*
 876          * But we use SBCB to ask for _supported_ SBCB calls. This does not mean
 877          * the callback is _requested_. But we still can't call interfaces that
 878          * are not requested.
 879          */
 880         if (swsci(dev_priv, SWSCI_SBCB_SUPPORTED_CALLBACKS, 0, &tmp) == 0) {
 881                 /* make the bits match the sub-function codes */
 882                 u32 low = tmp & 0x7ff;
 883                 u32 high = tmp & ~0xfff; /* bit 11 is reserved */
 884                 tmp = (high << 4) | (low << 1) | 1;
 885
 886                 /* best guess what to do with supported wrt requested */
 887                 if (requested_callbacks) {
 888                         u32 req = opregion->swsci_sbcb_sub_functions;
 889                         if ((req & tmp) != req)
 890                                 DRM_DEBUG_DRIVER("SWSCI BIOS requested (%08x) SBCB callbacks that are not supported (%08x)\n", req, tmp);
 891                         /* XXX: for now, trust the requested callbacks */
 892                         /* opregion->swsci_sbcb_sub_functions &= tmp; */
 893                 } else {
 894                         opregion->swsci_sbcb_sub_functions |= tmp;
 895                 }
 896         }
 897
 898         DRM_DEBUG_DRIVER("SWSCI GBDA callbacks %08x, SBCB callbacks %08x\n",
 899                          opregion->swsci_gbda_sub_functions,
 900                          opregion->swsci_sbcb_sub_functions);
 901 }
 902
 903 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 904 {
 905         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 906                       "VBIOS ROM for %s\n", id->ident);
 907         return 1;
 908 }
 909
 910 static const struct dmi_system_id intel_no_opregion_vbt[] = {
 911         {
 912                 .callback = intel_no_opregion_vbt_callback,
 913                 .ident = "ThinkCentre A57",
 914                 .matches = {
 915                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 916                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 917                 },
 918         },
 919         { }
 920 };
 921
 922 static int intel_load_vbt_firmware(struct drm_i915_private *dev_priv)
 923 {
 924         struct intel_opregion *opregion = &dev_priv->opregion;
 925         const struct firmware *fw = NULL;
 926         const char *name = i915_modparams.vbt_firmware;
 927         int ret;
 928
 929         if (!name || !*name)
 930                 return -ENOENT;
 931
 932         ret = request_firmware(&fw, name, &dev_priv->drm.pdev->dev);
 933         if (ret) {
 934                 DRM_ERROR("Requesting VBT firmware \"%s\" failed (%d)\n",
 935                           name, ret);
 936                 return ret;
 937         }
 938
 939         if (intel_bios_is_valid_vbt(fw->data, fw->size)) {
 940                 opregion->vbt_firmware = kmemdup(fw->data, fw->size, GFP_KERNEL);
 941                 if (opregion->vbt_firmware) {
 942                         DRM_DEBUG_KMS("Found valid VBT firmware \"%s\"\n", name);
 943                         opregion->vbt = opregion->vbt_firmware;
 944                         opregion->vbt_size = fw->size;
 945                         ret = 0;
 946                 } else {
 947                         ret = -ENOMEM;
 948                 }
 949         } else {
 950                 DRM_DEBUG_KMS("Invalid VBT firmware \"%s\"\n", name);
 951                 ret = -EINVAL;
 952         }
 953
 954         release_firmware(fw);
 955
 956         return ret;
 957 }
 958
 959 int intel_opregion_setup(struct drm_i915_private *dev_priv)
 960 {
 961         struct intel_opregion *opregion = &dev_priv->opregion;
 962         struct pci_dev *pdev = dev_priv->drm.pdev;
 963         u32 asls, mboxes;
 964         char buf[sizeof(OPREGION_SIGNATURE)];
 965         int err = 0;
 966         void *base;
 967         const void *vbt;
 968         u32 vbt_size;
 969
 970         BUILD_BUG_ON(sizeof(struct opregion_header) != 0x100);
 971         BUILD_BUG_ON(sizeof(struct opregion_acpi) != 0x100);
 972         BUILD_BUG_ON(sizeof(struct opregion_swsci) != 0x100);
 973         BUILD_BUG_ON(sizeof(struct opregion_asle) != 0x100);
 974         BUILD_BUG_ON(sizeof(struct opregion_asle_ext) != 0x400);
 975
 976         pci_read_config_dword(pdev, ASLS, &asls);
 977         DRM_DEBUG_DRIVER("graphic opregion physical addr: 0x%x\n", asls);
 978         if (asls == 0) {
 979                 DRM_DEBUG_DRIVER("ACPI OpRegion not supported!\n");
 980                 return -ENOTSUPP;
 981         }
 982
 983         INIT_WORK(&opregion->asle_work, asle_work);
 984
 985         base = memremap(asls, OPREGION_SIZE, MEMREMAP_WB);
 986         if (!base)
 987                 return -ENOMEM;
 988
 989         memcpy(buf, base, sizeof(buf));
 990
 991         if (memcmp(buf, OPREGION_SIGNATURE, 16)) {
 992                 DRM_DEBUG_DRIVER("opregion signature mismatch\n");
 993                 err = -EINVAL;
 994                 goto err_out;
 995         }
 996         opregion->header = base;
 997         opregion->lid_state = base + ACPI_CLID;
 998
 999         mboxes = opregion->header->mboxes;
1000         if (mboxes & MBOX_ACPI) {
1001                 DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
1002                 opregion->acpi = base + OPREGION_ACPI_OFFSET;
1003         }
1004
1005         if (mboxes & MBOX_SWSCI) {
1006                 DRM_DEBUG_DRIVER("SWSCI supported\n");
1007                 opregion->swsci = base + OPREGION_SWSCI_OFFSET;
1008                 swsci_setup(dev_priv);
1009         }
1010
1011         if (mboxes & MBOX_ASLE) {
1012                 DRM_DEBUG_DRIVER("ASLE supported\n");
1013                 opregion->asle = base + OPREGION_ASLE_OFFSET;
1014
1015                 opregion->asle->ardy = ASLE_ARDY_NOT_READY;
1016         }
1017
1018         if (mboxes & MBOX_ASLE_EXT)
1019                 DRM_DEBUG_DRIVER("ASLE extension supported\n");
1020
1021         if (intel_load_vbt_firmware(dev_priv) == 0)
1022                 goto out;
1023
1024         if (dmi_check_system(intel_no_opregion_vbt))
1025                 goto out;
1026
1027         if (opregion->header->opregion_ver >= 2 && opregion->asle &&
1028             opregion->asle->rvda && opregion->asle->rvds) {
1029                 opregion->rvda = memremap(opregion->asle->rvda,
1030                                           opregion->asle->rvds,
1031                                           MEMREMAP_WB);
1032                 vbt = opregion->rvda;
1033                 vbt_size = opregion->asle->rvds;
1034                 if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
1035                         DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (RVDA)\n");
1036                         opregion->vbt = vbt;
1037                         opregion->vbt_size = vbt_size;
1038                         goto out;
1039                 } else {
1040                         DRM_DEBUG_KMS("Invalid VBT in ACPI OpRegion (RVDA)\n");
1041                 }
1042         }
1043
1044         vbt = base + OPREGION_VBT_OFFSET;
1045         /*
1046          * The VBT specification says that if the ASLE ext mailbox is not used
1047          * its area is reserved, but on some CHT boards the VBT extends into the
1048          * ASLE ext area. Allow this even though it is against the spec, so we
1049          * do not end up rejecting the VBT on those boards (and end up not
1050          * finding the LCD panel because of this).
1051          */
1052         vbt_size = (mboxes & MBOX_ASLE_EXT) ?
1053                 OPREGION_ASLE_EXT_OFFSET : OPREGION_SIZE;
1054         vbt_size -= OPREGION_VBT_OFFSET;
1055         if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
1056                 DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (Mailbox #4)\n");
1057                 opregion->vbt = vbt;
1058                 opregion->vbt_size = vbt_size;
1059         } else {
1060                 DRM_DEBUG_KMS("Invalid VBT in ACPI OpRegion (Mailbox #4)\n");
1061         }
1062
1063 out:
1064         return 0;
1065
1066 err_out:
1067         memunmap(base);
1068         return err;
1069 }
1070
1071 static int intel_use_opregion_panel_type_callback(const struct dmi_system_id *id)
1072 {
1073         DRM_INFO("Using panel type from OpRegion on %s\n", id->ident);
1074         return 1;
1075 }
1076
1077 static const struct dmi_system_id intel_use_opregion_panel_type[] = {
1078         {
1079                 .callback = intel_use_opregion_panel_type_callback,
1080                 .ident = "Conrac GmbH IX45GM2",
1081                 .matches = {DMI_MATCH(DMI_SYS_VENDOR, "Conrac GmbH"),
1082                             DMI_MATCH(DMI_PRODUCT_NAME, "IX45GM2"),
1083                 },
1084         },
1085         { }
1086 };
1087
1088 int
1089 intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
1090 {
1091         u32 panel_details;
1092         int ret;
1093
1094         ret = swsci(dev_priv, SWSCI_GBDA_PANEL_DETAILS, 0x0, &panel_details);
1095         if (ret) {
1096                 DRM_DEBUG_KMS("Failed to get panel details from OpRegion (%d)\n",
1097                               ret);
1098                 return ret;
1099         }
1100
1101         ret = (panel_details >> 8) & 0xff;
1102         if (ret > 0x10) {
1103                 DRM_DEBUG_KMS("Invalid OpRegion panel type 0x%x\n", ret);
1104                 return -EINVAL;
1105         }
1106
1107         /* fall back to VBT panel type? */
1108         if (ret == 0x0) {
1109                 DRM_DEBUG_KMS("No panel type in OpRegion\n");
1110                 return -ENODEV;
1111         }
1112
1113         /*
1114          * So far we know that some machined must use it, others must not use it.
1115          * There doesn't seem to be any way to determine which way to go, except
1116          * via a quirk list :(
1117          */
1118         if (!dmi_check_system(intel_use_opregion_panel_type)) {
1119                 DRM_DEBUG_KMS("Ignoring OpRegion panel type (%d)\n", ret - 1);
1120                 return -ENODEV;
1121         }
1122
1123         return ret - 1;
1124 }