drivers/gpu/drm/i915/intel_lvds.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  */
  29
  30 #include <acpi/button.h>
  31 #include <linux/dmi.h>
  32 #include <linux/i2c.h>
  33 #include <linux/slab.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_crtc.h>
  36 #include <drm/drm_edid.h>
  37 #include "intel_drv.h"
  38 #include <drm/i915_drm.h>
  39 #include "i915_drv.h"
  40 #include <linux/acpi.h>
  41
  42 /* Private structure for the integrated LVDS support */
  43 struct intel_lvds_connector {
  44         struct intel_connector base;
  45
  46         struct notifier_block lid_notifier;
  47 };
  48
  49 struct intel_lvds_encoder {
  50         struct intel_encoder base;
  51
  52         bool is_dual_link;
  53         u32 reg;
  54
  55         struct intel_lvds_connector *attached_connector;
  56 };
  57
  58 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  59 {
  60         return container_of(encoder, struct intel_lvds_encoder, base.base);
  61 }
  62
  63 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  64 {
  65         return container_of(connector, struct intel_lvds_connector, base.base);
  66 }
  67
  68 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  69                                     enum pipe *pipe)
  70 {
  71         struct drm_device *dev = encoder->base.dev;
  72         struct drm_i915_private *dev_priv = dev->dev_private;
  73         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  74         u32 tmp;
  75
  76         tmp = I915_READ(lvds_encoder->reg);
  77
  78         if (!(tmp & LVDS_PORT_EN))
  79                 return false;
  80
  81         if (HAS_PCH_CPT(dev))
  82                 *pipe = PORT_TO_PIPE_CPT(tmp);
  83         else
  84                 *pipe = PORT_TO_PIPE(tmp);
  85
  86         return true;
  87 }
  88
  89 /* The LVDS pin pair needs to be on before the DPLLs are enabled.
  90  * This is an exception to the general rule that mode_set doesn't turn
  91  * things on.
  92  */
  93 static void intel_pre_pll_enable_lvds(struct intel_encoder *encoder)
  94 {
  95         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  96         struct drm_device *dev = encoder->base.dev;
  97         struct drm_i915_private *dev_priv = dev->dev_private;
  98         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
  99         struct drm_display_mode *fixed_mode =
 100                 lvds_encoder->attached_connector->base.panel.fixed_mode;
 101         int pipe = intel_crtc->pipe;
 102         u32 temp;
 103
 104         temp = I915_READ(lvds_encoder->reg);
 105         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 106
 107         if (HAS_PCH_CPT(dev)) {
 108                 temp &= ~PORT_TRANS_SEL_MASK;
 109                 temp |= PORT_TRANS_SEL_CPT(pipe);
 110         } else {
 111                 if (pipe == 1) {
 112                         temp |= LVDS_PIPEB_SELECT;
 113                 } else {
 114                         temp &= ~LVDS_PIPEB_SELECT;
 115                 }
 116         }
 117
 118         /* set the corresponsding LVDS_BORDER bit */
 119         temp &= ~LVDS_BORDER_ENABLE;
 120         temp |= intel_crtc->config.gmch_pfit.lvds_border_bits;
 121         /* Set the B0-B3 data pairs corresponding to whether we're going to
 122          * set the DPLLs for dual-channel mode or not.
 123          */
 124         if (lvds_encoder->is_dual_link)
 125                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 126         else
 127                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 128
 129         /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 130          * appropriately here, but we need to look more thoroughly into how
 131          * panels behave in the two modes.
 132          */
 133
 134         /* Set the dithering flag on LVDS as needed, note that there is no
 135          * special lvds dither control bit on pch-split platforms, dithering is
 136          * only controlled through the PIPECONF reg. */
 137         if (INTEL_INFO(dev)->gen == 4) {
 138                 /* Bspec wording suggests that LVDS port dithering only exists
 139                  * for 18bpp panels. */
 140                 if (intel_crtc->config.dither &&
 141                     intel_crtc->config.pipe_bpp == 18)
 142                         temp |= LVDS_ENABLE_DITHER;
 143                 else
 144                         temp &= ~LVDS_ENABLE_DITHER;
 145         }
 146         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 147         if (fixed_mode->flags & DRM_MODE_FLAG_NHSYNC)
 148                 temp |= LVDS_HSYNC_POLARITY;
 149         if (fixed_mode->flags & DRM_MODE_FLAG_NVSYNC)
 150                 temp |= LVDS_VSYNC_POLARITY;
 151
 152         I915_WRITE(lvds_encoder->reg, temp);
 153 }
 154
 155 /**
 156  * Sets the power state for the panel.
 157  */
 158 static void intel_enable_lvds(struct intel_encoder *encoder)
 159 {
 160         struct drm_device *dev = encoder->base.dev;
 161         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 162         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 163         struct drm_i915_private *dev_priv = dev->dev_private;
 164         u32 ctl_reg, stat_reg;
 165
 166         if (HAS_PCH_SPLIT(dev)) {
 167                 ctl_reg = PCH_PP_CONTROL;
 168                 stat_reg = PCH_PP_STATUS;
 169         } else {
 170                 ctl_reg = PP_CONTROL;
 171                 stat_reg = PP_STATUS;
 172         }
 173
 174         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 175
 176         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 177         POSTING_READ(lvds_encoder->reg);
 178         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 179                 DRM_ERROR("timed out waiting for panel to power on\n");
 180
 181         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 182 }
 183
 184 static void intel_disable_lvds(struct intel_encoder *encoder)
 185 {
 186         struct drm_device *dev = encoder->base.dev;
 187         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 188         struct drm_i915_private *dev_priv = dev->dev_private;
 189         u32 ctl_reg, stat_reg;
 190
 191         if (HAS_PCH_SPLIT(dev)) {
 192                 ctl_reg = PCH_PP_CONTROL;
 193                 stat_reg = PCH_PP_STATUS;
 194         } else {
 195                 ctl_reg = PP_CONTROL;
 196                 stat_reg = PP_STATUS;
 197         }
 198
 199         intel_panel_disable_backlight(dev);
 200
 201         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 202         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 203                 DRM_ERROR("timed out waiting for panel to power off\n");
 204
 205         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 206         POSTING_READ(lvds_encoder->reg);
 207 }
 208
 209 static int intel_lvds_mode_valid(struct drm_connector *connector,
 210                                  struct drm_display_mode *mode)
 211 {
 212         struct intel_connector *intel_connector = to_intel_connector(connector);
 213         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 214
 215         if (mode->hdisplay > fixed_mode->hdisplay)
 216                 return MODE_PANEL;
 217         if (mode->vdisplay > fixed_mode->vdisplay)
 218                 return MODE_PANEL;
 219
 220         return MODE_OK;
 221 }
 222
 223 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 224                                       struct intel_crtc_config *pipe_config)
 225 {
 226         struct drm_device *dev = intel_encoder->base.dev;
 227         struct drm_i915_private *dev_priv = dev->dev_private;
 228         struct intel_lvds_encoder *lvds_encoder =
 229                 to_lvds_encoder(&intel_encoder->base);
 230         struct intel_connector *intel_connector =
 231                 &lvds_encoder->attached_connector->base;
 232         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 233         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 234         unsigned int lvds_bpp;
 235
 236         /* Should never happen!! */
 237         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 238                 DRM_ERROR("Can't support LVDS on pipe A\n");
 239                 return false;
 240         }
 241
 242         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
 243                 return false;
 244
 245         if ((I915_READ(lvds_encoder->reg) & LVDS_A3_POWER_MASK) ==
 246             LVDS_A3_POWER_UP)
 247                 lvds_bpp = 8*3;
 248         else
 249                 lvds_bpp = 6*3;
 250
 251         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 252                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 253                               pipe_config->pipe_bpp, lvds_bpp);
 254                 pipe_config->pipe_bpp = lvds_bpp;
 255         }
 256
 257         /*
 258          * We have timings from the BIOS for the panel, put them in
 259          * to the adjusted mode.  The CRTC will be set up for this mode,
 260          * with the panel scaling set up to source from the H/VDisplay
 261          * of the original mode.
 262          */
 263         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 264                                adjusted_mode);
 265
 266         if (HAS_PCH_SPLIT(dev)) {
 267                 pipe_config->has_pch_encoder = true;
 268
 269                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 270                                         intel_connector->panel.fitting_mode);
 271                 return true;
 272         } else {
 273                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 274                                          intel_connector->panel.fitting_mode);
 275         }
 276
 277         drm_mode_set_crtcinfo(adjusted_mode, 0);
 278         pipe_config->timings_set = true;
 279
 280         /*
 281          * XXX: It would be nice to support lower refresh rates on the
 282          * panels to reduce power consumption, and perhaps match the
 283          * user's requested refresh rate.
 284          */
 285
 286         return true;
 287 }
 288
 289 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 290                                 struct drm_display_mode *mode,
 291                                 struct drm_display_mode *adjusted_mode)
 292 {
 293         /*
 294          * The LVDS pin pair will already have been turned on in the
 295          * intel_crtc_mode_set since it has a large impact on the DPLL
 296          * settings.
 297          */
 298 }
 299
 300 /**
 301  * Detect the LVDS connection.
 302  *
 303  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 304  * connected and closed means disconnected.  We also send hotplug events as
 305  * needed, using lid status notification from the input layer.
 306  */
 307 static enum drm_connector_status
 308 intel_lvds_detect(struct drm_connector *connector, bool force)
 309 {
 310         struct drm_device *dev = connector->dev;
 311         enum drm_connector_status status;
 312
 313         status = intel_panel_detect(dev);
 314         if (status != connector_status_unknown)
 315                 return status;
 316
 317         return connector_status_connected;
 318 }
 319
 320 /**
 321  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 322  */
 323 static int intel_lvds_get_modes(struct drm_connector *connector)
 324 {
 325         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 326         struct drm_device *dev = connector->dev;
 327         struct drm_display_mode *mode;
 328
 329         /* use cached edid if we have one */
 330         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 331                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 332
 333         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 334         if (mode == NULL)
 335                 return 0;
 336
 337         drm_mode_probed_add(connector, mode);
 338         return 1;
 339 }
 340
 341 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 342 {
 343         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 344         return 1;
 345 }
 346
 347 /* The GPU hangs up on these systems if modeset is performed on LID open */
 348 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 349         {
 350                 .callback = intel_no_modeset_on_lid_dmi_callback,
 351                 .ident = "Toshiba Tecra A11",
 352                 .matches = {
 353                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 354                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 355                 },
 356         },
 357
 358         { }     /* terminating entry */
 359 };
 360
 361 /*
 362  * Lid events. Note the use of 'modeset':
 363  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 364  *    and set it to MODESET_DONE on open
 365  *  - we use it as a "only once" bit (ie we ignore
 366  *    duplicate events where it was already properly set)
 367  *  - the suspend/resume paths will set it to
 368  *    MODESET_SUSPENDED and ignore the lid open event,
 369  *    because they restore the mode ("lid open").
 370  */
 371 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 372                             void *unused)
 373 {
 374         struct intel_lvds_connector *lvds_connector =
 375                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 376         struct drm_connector *connector = &lvds_connector->base.base;
 377         struct drm_device *dev = connector->dev;
 378         struct drm_i915_private *dev_priv = dev->dev_private;
 379
 380         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 381                 return NOTIFY_OK;
 382
 383         mutex_lock(&dev_priv->modeset_restore_lock);
 384         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 385                 goto exit;
 386         /*
 387          * check and update the status of LVDS connector after receiving
 388          * the LID nofication event.
 389          */
 390         connector->status = connector->funcs->detect(connector, false);
 391
 392         /* Don't force modeset on machines where it causes a GPU lockup */
 393         if (dmi_check_system(intel_no_modeset_on_lid))
 394                 goto exit;
 395         if (!acpi_lid_open()) {
 396                 /* do modeset on next lid open event */
 397                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 398                 goto exit;
 399         }
 400
 401         if (dev_priv->modeset_restore == MODESET_DONE)
 402                 goto exit;
 403
 404         drm_modeset_lock_all(dev);
 405         intel_modeset_setup_hw_state(dev, true);
 406         drm_modeset_unlock_all(dev);
 407
 408         dev_priv->modeset_restore = MODESET_DONE;
 409
 410 exit:
 411         mutex_unlock(&dev_priv->modeset_restore_lock);
 412         return NOTIFY_OK;
 413 }
 414
 415 /**
 416  * intel_lvds_destroy - unregister and free LVDS structures
 417  * @connector: connector to free
 418  *
 419  * Unregister the DDC bus for this connector then free the driver private
 420  * structure.
 421  */
 422 static void intel_lvds_destroy(struct drm_connector *connector)
 423 {
 424         struct intel_lvds_connector *lvds_connector =
 425                 to_lvds_connector(connector);
 426
 427         if (lvds_connector->lid_notifier.notifier_call)
 428                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 429
 430         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 431                 kfree(lvds_connector->base.edid);
 432
 433         intel_panel_fini(&lvds_connector->base.panel);
 434
 435         drm_sysfs_connector_remove(connector);
 436         drm_connector_cleanup(connector);
 437         kfree(connector);
 438 }
 439
 440 static int intel_lvds_set_property(struct drm_connector *connector,
 441                                    struct drm_property *property,
 442                                    uint64_t value)
 443 {
 444         struct intel_connector *intel_connector = to_intel_connector(connector);
 445         struct drm_device *dev = connector->dev;
 446
 447         if (property == dev->mode_config.scaling_mode_property) {
 448                 struct drm_crtc *crtc;
 449
 450                 if (value == DRM_MODE_SCALE_NONE) {
 451                         DRM_DEBUG_KMS("no scaling not supported\n");
 452                         return -EINVAL;
 453                 }
 454
 455                 if (intel_connector->panel.fitting_mode == value) {
 456                         /* the LVDS scaling property is not changed */
 457                         return 0;
 458                 }
 459                 intel_connector->panel.fitting_mode = value;
 460
 461                 crtc = intel_attached_encoder(connector)->base.crtc;
 462                 if (crtc && crtc->enabled) {
 463                         /*
 464                          * If the CRTC is enabled, the display will be changed
 465                          * according to the new panel fitting mode.
 466                          */
 467                         intel_crtc_restore_mode(crtc);
 468                 }
 469         }
 470
 471         return 0;
 472 }
 473
 474 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 475         .mode_set = intel_lvds_mode_set,
 476 };
 477
 478 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 479         .get_modes = intel_lvds_get_modes,
 480         .mode_valid = intel_lvds_mode_valid,
 481         .best_encoder = intel_best_encoder,
 482 };
 483
 484 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 485         .dpms = intel_connector_dpms,
 486         .detect = intel_lvds_detect,
 487         .fill_modes = drm_helper_probe_single_connector_modes,
 488         .set_property = intel_lvds_set_property,
 489         .destroy = intel_lvds_destroy,
 490 };
 491
 492 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 493         .destroy = intel_encoder_destroy,
 494 };
 495
 496 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 497 {
 498         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 499         return 1;
 500 }
 501
 502 /* These systems claim to have LVDS, but really don't */
 503 static const struct dmi_system_id intel_no_lvds[] = {
 504         {
 505                 .callback = intel_no_lvds_dmi_callback,
 506                 .ident = "Apple Mac Mini (Core series)",
 507                 .matches = {
 508                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 509                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 510                 },
 511         },
 512         {
 513                 .callback = intel_no_lvds_dmi_callback,
 514                 .ident = "Apple Mac Mini (Core 2 series)",
 515                 .matches = {
 516                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 517                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 518                 },
 519         },
 520         {
 521                 .callback = intel_no_lvds_dmi_callback,
 522                 .ident = "MSI IM-945GSE-A",
 523                 .matches = {
 524                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 525                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 526                 },
 527         },
 528         {
 529                 .callback = intel_no_lvds_dmi_callback,
 530                 .ident = "Dell Studio Hybrid",
 531                 .matches = {
 532                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 533                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 534                 },
 535         },
 536         {
 537                 .callback = intel_no_lvds_dmi_callback,
 538                 .ident = "Dell OptiPlex FX170",
 539                 .matches = {
 540                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 541                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 542                 },
 543         },
 544         {
 545                 .callback = intel_no_lvds_dmi_callback,
 546                 .ident = "AOpen Mini PC",
 547                 .matches = {
 548                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 549                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 550                 },
 551         },
 552         {
 553                 .callback = intel_no_lvds_dmi_callback,
 554                 .ident = "AOpen Mini PC MP915",
 555                 .matches = {
 556                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 557                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 558                 },
 559         },
 560         {
 561                 .callback = intel_no_lvds_dmi_callback,
 562                 .ident = "AOpen i915GMm-HFS",
 563                 .matches = {
 564                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 565                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 566                 },
 567         },
 568         {
 569                 .callback = intel_no_lvds_dmi_callback,
 570                 .ident = "AOpen i45GMx-I",
 571                 .matches = {
 572                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 573                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 574                 },
 575         },
 576         {
 577                 .callback = intel_no_lvds_dmi_callback,
 578                 .ident = "Aopen i945GTt-VFA",
 579                 .matches = {
 580                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 581                 },
 582         },
 583         {
 584                 .callback = intel_no_lvds_dmi_callback,
 585                 .ident = "Clientron U800",
 586                 .matches = {
 587                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 588                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 589                 },
 590         },
 591         {
 592                 .callback = intel_no_lvds_dmi_callback,
 593                 .ident = "Clientron E830",
 594                 .matches = {
 595                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 596                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 597                 },
 598         },
 599         {
 600                 .callback = intel_no_lvds_dmi_callback,
 601                 .ident = "Asus EeeBox PC EB1007",
 602                 .matches = {
 603                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 604                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 605                 },
 606         },
 607         {
 608                 .callback = intel_no_lvds_dmi_callback,
 609                 .ident = "Asus AT5NM10T-I",
 610                 .matches = {
 611                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 612                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 613                 },
 614         },
 615         {
 616                 .callback = intel_no_lvds_dmi_callback,
 617                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 618                 .matches = {
 619                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 620                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 621                 },
 622         },
 623         {
 624                 .callback = intel_no_lvds_dmi_callback,
 625                 .ident = "Hewlett-Packard t5745",
 626                 .matches = {
 627                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 628                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 629                 },
 630         },
 631         {
 632                 .callback = intel_no_lvds_dmi_callback,
 633                 .ident = "Hewlett-Packard st5747",
 634                 .matches = {
 635                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 636                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 637                 },
 638         },
 639         {
 640                 .callback = intel_no_lvds_dmi_callback,
 641                 .ident = "MSI Wind Box DC500",
 642                 .matches = {
 643                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 644                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 645                 },
 646         },
 647         {
 648                 .callback = intel_no_lvds_dmi_callback,
 649                 .ident = "Gigabyte GA-D525TUD",
 650                 .matches = {
 651                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 652                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 653                 },
 654         },
 655         {
 656                 .callback = intel_no_lvds_dmi_callback,
 657                 .ident = "Supermicro X7SPA-H",
 658                 .matches = {
 659                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 660                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 661                 },
 662         },
 663         {
 664                 .callback = intel_no_lvds_dmi_callback,
 665                 .ident = "Fujitsu Esprimo Q900",
 666                 .matches = {
 667                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 668                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 669                 },
 670         },
 671
 672         { }     /* terminating entry */
 673 };
 674
 675 /**
 676  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 677  * @dev: drm device
 678  * @connector: LVDS connector
 679  *
 680  * Find the reduced downclock for LVDS in EDID.
 681  */
 682 static void intel_find_lvds_downclock(struct drm_device *dev,
 683                                       struct drm_display_mode *fixed_mode,
 684                                       struct drm_connector *connector)
 685 {
 686         struct drm_i915_private *dev_priv = dev->dev_private;
 687         struct drm_display_mode *scan;
 688         int temp_downclock;
 689
 690         temp_downclock = fixed_mode->clock;
 691         list_for_each_entry(scan, &connector->probed_modes, head) {
 692                 /*
 693                  * If one mode has the same resolution with the fixed_panel
 694                  * mode while they have the different refresh rate, it means
 695                  * that the reduced downclock is found for the LVDS. In such
 696                  * case we can set the different FPx0/1 to dynamically select
 697                  * between low and high frequency.
 698                  */
 699                 if (scan->hdisplay == fixed_mode->hdisplay &&
 700                     scan->hsync_start == fixed_mode->hsync_start &&
 701                     scan->hsync_end == fixed_mode->hsync_end &&
 702                     scan->htotal == fixed_mode->htotal &&
 703                     scan->vdisplay == fixed_mode->vdisplay &&
 704                     scan->vsync_start == fixed_mode->vsync_start &&
 705                     scan->vsync_end == fixed_mode->vsync_end &&
 706                     scan->vtotal == fixed_mode->vtotal) {
 707                         if (scan->clock < temp_downclock) {
 708                                 /*
 709                                  * The downclock is already found. But we
 710                                  * expect to find the lower downclock.
 711                                  */
 712                                 temp_downclock = scan->clock;
 713                         }
 714                 }
 715         }
 716         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 717                 /* We found the downclock for LVDS. */
 718                 dev_priv->lvds_downclock_avail = 1;
 719                 dev_priv->lvds_downclock = temp_downclock;
 720                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 721                               "Normal clock %dKhz, downclock %dKhz\n",
 722                               fixed_mode->clock, temp_downclock);
 723         }
 724 }
 725
 726 /*
 727  * Enumerate the child dev array parsed from VBT to check whether
 728  * the LVDS is present.
 729  * If it is present, return 1.
 730  * If it is not present, return false.
 731  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 732  */
 733 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 734                                    u8 *i2c_pin)
 735 {
 736         struct drm_i915_private *dev_priv = dev->dev_private;
 737         int i;
 738
 739         if (!dev_priv->vbt.child_dev_num)
 740                 return true;
 741
 742         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 743                 struct child_device_config *child = dev_priv->vbt.child_dev + i;
 744
 745                 /* If the device type is not LFP, continue.
 746                  * We have to check both the new identifiers as well as the
 747                  * old for compatibility with some BIOSes.
 748                  */
 749                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 750                     child->device_type != DEVICE_TYPE_LFP)
 751                         continue;
 752
 753                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 754                         *i2c_pin = child->i2c_pin;
 755
 756                 /* However, we cannot trust the BIOS writers to populate
 757                  * the VBT correctly.  Since LVDS requires additional
 758                  * information from AIM blocks, a non-zero addin offset is
 759                  * a good indicator that the LVDS is actually present.
 760                  */
 761                 if (child->addin_offset)
 762                         return true;
 763
 764                 /* But even then some BIOS writers perform some black magic
 765                  * and instantiate the device without reference to any
 766                  * additional data.  Trust that if the VBT was written into
 767                  * the OpRegion then they have validated the LVDS's existence.
 768                  */
 769                 if (dev_priv->opregion.vbt)
 770                         return true;
 771         }
 772
 773         return false;
 774 }
 775
 776 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 777 {
 778         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 779         return 1;
 780 }
 781
 782 static const struct dmi_system_id intel_dual_link_lvds[] = {
 783         {
 784                 .callback = intel_dual_link_lvds_callback,
 785                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 786                 .matches = {
 787                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 788                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 789                 },
 790         },
 791         { }     /* terminating entry */
 792 };
 793
 794 bool intel_is_dual_link_lvds(struct drm_device *dev)
 795 {
 796         struct intel_encoder *encoder;
 797         struct intel_lvds_encoder *lvds_encoder;
 798
 799         list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 800                             base.head) {
 801                 if (encoder->type == INTEL_OUTPUT_LVDS) {
 802                         lvds_encoder = to_lvds_encoder(&encoder->base);
 803
 804                         return lvds_encoder->is_dual_link;
 805                 }
 806         }
 807
 808         return false;
 809 }
 810
 811 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 812 {
 813         struct drm_device *dev = lvds_encoder->base.base.dev;
 814         unsigned int val;
 815         struct drm_i915_private *dev_priv = dev->dev_private;
 816
 817         /* use the module option value if specified */
 818         if (i915_lvds_channel_mode > 0)
 819                 return i915_lvds_channel_mode == 2;
 820
 821         if (dmi_check_system(intel_dual_link_lvds))
 822                 return true;
 823
 824         /* BIOS should set the proper LVDS register value at boot, but
 825          * in reality, it doesn't set the value when the lid is closed;
 826          * we need to check "the value to be set" in VBT when LVDS
 827          * register is uninitialized.
 828          */
 829         val = I915_READ(lvds_encoder->reg);
 830         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 831                 val = dev_priv->vbt.bios_lvds_val;
 832
 833         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 834 }
 835
 836 static bool intel_lvds_supported(struct drm_device *dev)
 837 {
 838         /* With the introduction of the PCH we gained a dedicated
 839          * LVDS presence pin, use it. */
 840         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 841                 return true;
 842
 843         /* Otherwise LVDS was only attached to mobile products,
 844          * except for the inglorious 830gm */
 845         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 846                 return true;
 847
 848         return false;
 849 }
 850
 851 /**
 852  * intel_lvds_init - setup LVDS connectors on this device
 853  * @dev: drm device
 854  *
 855  * Create the connector, register the LVDS DDC bus, and try to figure out what
 856  * modes we can display on the LVDS panel (if present).
 857  */
 858 bool intel_lvds_init(struct drm_device *dev)
 859 {
 860         struct drm_i915_private *dev_priv = dev->dev_private;
 861         struct intel_lvds_encoder *lvds_encoder;
 862         struct intel_encoder *intel_encoder;
 863         struct intel_lvds_connector *lvds_connector;
 864         struct intel_connector *intel_connector;
 865         struct drm_connector *connector;
 866         struct drm_encoder *encoder;
 867         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 868         struct drm_display_mode *fixed_mode = NULL;
 869         struct edid *edid;
 870         struct drm_crtc *crtc;
 871         u32 lvds;
 872         int pipe;
 873         u8 pin;
 874
 875         if (!intel_lvds_supported(dev))
 876                 return false;
 877
 878         /* Skip init on machines we know falsely report LVDS */
 879         if (dmi_check_system(intel_no_lvds))
 880                 return false;
 881
 882         pin = GMBUS_PORT_PANEL;
 883         if (!lvds_is_present_in_vbt(dev, &pin)) {
 884                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 885                 return false;
 886         }
 887
 888         if (HAS_PCH_SPLIT(dev)) {
 889                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 890                         return false;
 891                 if (dev_priv->vbt.edp_support) {
 892                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 893                         return false;
 894                 }
 895         }
 896
 897         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 898         if (!lvds_encoder)
 899                 return false;
 900
 901         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 902         if (!lvds_connector) {
 903                 kfree(lvds_encoder);
 904                 return false;
 905         }
 906
 907         lvds_encoder->attached_connector = lvds_connector;
 908
 909         intel_encoder = &lvds_encoder->base;
 910         encoder = &intel_encoder->base;
 911         intel_connector = &lvds_connector->base;
 912         connector = &intel_connector->base;
 913         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 914                            DRM_MODE_CONNECTOR_LVDS);
 915
 916         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 917                          DRM_MODE_ENCODER_LVDS);
 918
 919         intel_encoder->enable = intel_enable_lvds;
 920         intel_encoder->pre_pll_enable = intel_pre_pll_enable_lvds;
 921         intel_encoder->compute_config = intel_lvds_compute_config;
 922         intel_encoder->disable = intel_disable_lvds;
 923         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 924         intel_connector->get_hw_state = intel_connector_get_hw_state;
 925
 926         intel_connector_attach_encoder(intel_connector, intel_encoder);
 927         intel_encoder->type = INTEL_OUTPUT_LVDS;
 928
 929         intel_encoder->cloneable = false;
 930         if (HAS_PCH_SPLIT(dev))
 931                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 932         else if (IS_GEN4(dev))
 933                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 934         else
 935                 intel_encoder->crtc_mask = (1 << 1);
 936
 937         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 938         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 939         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 940         connector->interlace_allowed = false;
 941         connector->doublescan_allowed = false;
 942
 943         if (HAS_PCH_SPLIT(dev)) {
 944                 lvds_encoder->reg = PCH_LVDS;
 945         } else {
 946                 lvds_encoder->reg = LVDS;
 947         }
 948
 949         /* create the scaling mode property */
 950         drm_mode_create_scaling_mode_property(dev);
 951         drm_object_attach_property(&connector->base,
 952                                       dev->mode_config.scaling_mode_property,
 953                                       DRM_MODE_SCALE_ASPECT);
 954         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
 955         /*
 956          * LVDS discovery:
 957          * 1) check for EDID on DDC
 958          * 2) check for VBT data
 959          * 3) check to see if LVDS is already on
 960          *    if none of the above, no panel
 961          * 4) make sure lid is open
 962          *    if closed, act like it's not there for now
 963          */
 964
 965         /*
 966          * Attempt to get the fixed panel mode from DDC.  Assume that the
 967          * preferred mode is the right one.
 968          */
 969         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
 970         if (edid) {
 971                 if (drm_add_edid_modes(connector, edid)) {
 972                         drm_mode_connector_update_edid_property(connector,
 973                                                                 edid);
 974                 } else {
 975                         kfree(edid);
 976                         edid = ERR_PTR(-EINVAL);
 977                 }
 978         } else {
 979                 edid = ERR_PTR(-ENOENT);
 980         }
 981         lvds_connector->base.edid = edid;
 982
 983         if (IS_ERR_OR_NULL(edid)) {
 984                 /* Didn't get an EDID, so
 985                  * Set wide sync ranges so we get all modes
 986                  * handed to valid_mode for checking
 987                  */
 988                 connector->display_info.min_vfreq = 0;
 989                 connector->display_info.max_vfreq = 200;
 990                 connector->display_info.min_hfreq = 0;
 991                 connector->display_info.max_hfreq = 200;
 992         }
 993
 994         list_for_each_entry(scan, &connector->probed_modes, head) {
 995                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 996                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
 997                         drm_mode_debug_printmodeline(scan);
 998
 999                         fixed_mode = drm_mode_duplicate(dev, scan);
1000                         if (fixed_mode) {
1001                                 intel_find_lvds_downclock(dev, fixed_mode,
1002                                                           connector);
1003                                 goto out;
1004                         }
1005                 }
1006         }
1007
1008         /* Failed to get EDID, what about VBT? */
1009         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1010                 DRM_DEBUG_KMS("using mode from VBT: ");
1011                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1012
1013                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1014                 if (fixed_mode) {
1015                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1016                         goto out;
1017                 }
1018         }
1019
1020         /*
1021          * If we didn't get EDID, try checking if the panel is already turned
1022          * on.  If so, assume that whatever is currently programmed is the
1023          * correct mode.
1024          */
1025
1026         /* Ironlake: FIXME if still fail, not try pipe mode now */
1027         if (HAS_PCH_SPLIT(dev))
1028                 goto failed;
1029
1030         lvds = I915_READ(LVDS);
1031         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1032         crtc = intel_get_crtc_for_pipe(dev, pipe);
1033
1034         if (crtc && (lvds & LVDS_PORT_EN)) {
1035                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1036                 if (fixed_mode) {
1037                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1038                         drm_mode_debug_printmodeline(fixed_mode);
1039                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1040                         goto out;
1041                 }
1042         }
1043
1044         /* If we still don't have a mode after all that, give up. */
1045         if (!fixed_mode)
1046                 goto failed;
1047
1048 out:
1049         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1050         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1051                       lvds_encoder->is_dual_link ? "dual" : "single");
1052
1053         /*
1054          * Unlock registers and just
1055          * leave them unlocked
1056          */
1057         if (HAS_PCH_SPLIT(dev)) {
1058                 I915_WRITE(PCH_PP_CONTROL,
1059                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1060         } else {
1061                 I915_WRITE(PP_CONTROL,
1062                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1063         }
1064         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1065         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1066                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1067                 lvds_connector->lid_notifier.notifier_call = NULL;
1068         }
1069         drm_sysfs_connector_add(connector);
1070
1071         intel_panel_init(&intel_connector->panel, fixed_mode);
1072         intel_panel_setup_backlight(connector);
1073
1074         return true;
1075
1076 failed:
1077         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1078         drm_connector_cleanup(connector);
1079         drm_encoder_cleanup(encoder);
1080         if (fixed_mode)
1081                 drm_mode_destroy(dev, fixed_mode);
1082         kfree(lvds_encoder);
1083         kfree(lvds_connector);
1084         return false;
1085 }