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 static void intel_lvds_get_config(struct intel_encoder *encoder,
  90                                   struct intel_crtc_config *pipe_config)
  91 {
  92         struct drm_device *dev = encoder->base.dev;
  93         struct drm_i915_private *dev_priv = dev->dev_private;
  94         u32 lvds_reg, tmp, flags = 0;
  95
  96         if (HAS_PCH_SPLIT(dev))
  97                 lvds_reg = PCH_LVDS;
  98         else
  99                 lvds_reg = LVDS;
 100
 101         tmp = I915_READ(lvds_reg);
 102         if (tmp & LVDS_HSYNC_POLARITY)
 103                 flags |= DRM_MODE_FLAG_NHSYNC;
 104         else
 105                 flags |= DRM_MODE_FLAG_PHSYNC;
 106         if (tmp & LVDS_VSYNC_POLARITY)
 107                 flags |= DRM_MODE_FLAG_NVSYNC;
 108         else
 109                 flags |= DRM_MODE_FLAG_PVSYNC;
 110
 111         pipe_config->adjusted_mode.flags |= flags;
 112
 113         /* gen2/3 store dither state in pfit control, needs to match */
 114         if (INTEL_INFO(dev)->gen < 4) {
 115                 tmp = I915_READ(PFIT_CONTROL);
 116
 117                 pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
 118         }
 119 }
 120
 121 /* The LVDS pin pair needs to be on before the DPLLs are enabled.
 122  * This is an exception to the general rule that mode_set doesn't turn
 123  * things on.
 124  */
 125 static void intel_pre_enable_lvds(struct intel_encoder *encoder)
 126 {
 127         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 128         struct drm_device *dev = encoder->base.dev;
 129         struct drm_i915_private *dev_priv = dev->dev_private;
 130         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 131         struct drm_display_mode *fixed_mode =
 132                 lvds_encoder->attached_connector->base.panel.fixed_mode;
 133         int pipe = crtc->pipe;
 134         u32 temp;
 135
 136         if (HAS_PCH_SPLIT(dev)) {
 137                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 138                 assert_shared_dpll_disabled(dev_priv,
 139                                             intel_crtc_to_shared_dpll(crtc));
 140         } else {
 141                 assert_pll_disabled(dev_priv, pipe);
 142         }
 143
 144         temp = I915_READ(lvds_encoder->reg);
 145         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 146
 147         if (HAS_PCH_CPT(dev)) {
 148                 temp &= ~PORT_TRANS_SEL_MASK;
 149                 temp |= PORT_TRANS_SEL_CPT(pipe);
 150         } else {
 151                 if (pipe == 1) {
 152                         temp |= LVDS_PIPEB_SELECT;
 153                 } else {
 154                         temp &= ~LVDS_PIPEB_SELECT;
 155                 }
 156         }
 157
 158         /* set the corresponsding LVDS_BORDER bit */
 159         temp &= ~LVDS_BORDER_ENABLE;
 160         temp |= crtc->config.gmch_pfit.lvds_border_bits;
 161         /* Set the B0-B3 data pairs corresponding to whether we're going to
 162          * set the DPLLs for dual-channel mode or not.
 163          */
 164         if (lvds_encoder->is_dual_link)
 165                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 166         else
 167                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 168
 169         /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 170          * appropriately here, but we need to look more thoroughly into how
 171          * panels behave in the two modes.
 172          */
 173
 174         /* Set the dithering flag on LVDS as needed, note that there is no
 175          * special lvds dither control bit on pch-split platforms, dithering is
 176          * only controlled through the PIPECONF reg. */
 177         if (INTEL_INFO(dev)->gen == 4) {
 178                 /* Bspec wording suggests that LVDS port dithering only exists
 179                  * for 18bpp panels. */
 180                 if (crtc->config.dither && crtc->config.pipe_bpp == 18)
 181                         temp |= LVDS_ENABLE_DITHER;
 182                 else
 183                         temp &= ~LVDS_ENABLE_DITHER;
 184         }
 185         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 186         if (fixed_mode->flags & DRM_MODE_FLAG_NHSYNC)
 187                 temp |= LVDS_HSYNC_POLARITY;
 188         if (fixed_mode->flags & DRM_MODE_FLAG_NVSYNC)
 189                 temp |= LVDS_VSYNC_POLARITY;
 190
 191         I915_WRITE(lvds_encoder->reg, temp);
 192 }
 193
 194 /**
 195  * Sets the power state for the panel.
 196  */
 197 static void intel_enable_lvds(struct intel_encoder *encoder)
 198 {
 199         struct drm_device *dev = encoder->base.dev;
 200         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 201         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 202         struct drm_i915_private *dev_priv = dev->dev_private;
 203         u32 ctl_reg, stat_reg;
 204
 205         if (HAS_PCH_SPLIT(dev)) {
 206                 ctl_reg = PCH_PP_CONTROL;
 207                 stat_reg = PCH_PP_STATUS;
 208         } else {
 209                 ctl_reg = PP_CONTROL;
 210                 stat_reg = PP_STATUS;
 211         }
 212
 213         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 214
 215         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 216         POSTING_READ(lvds_encoder->reg);
 217         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 218                 DRM_ERROR("timed out waiting for panel to power on\n");
 219
 220         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 221 }
 222
 223 static void intel_disable_lvds(struct intel_encoder *encoder)
 224 {
 225         struct drm_device *dev = encoder->base.dev;
 226         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 227         struct drm_i915_private *dev_priv = dev->dev_private;
 228         u32 ctl_reg, stat_reg;
 229
 230         if (HAS_PCH_SPLIT(dev)) {
 231                 ctl_reg = PCH_PP_CONTROL;
 232                 stat_reg = PCH_PP_STATUS;
 233         } else {
 234                 ctl_reg = PP_CONTROL;
 235                 stat_reg = PP_STATUS;
 236         }
 237
 238         intel_panel_disable_backlight(dev);
 239
 240         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 241         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 242                 DRM_ERROR("timed out waiting for panel to power off\n");
 243
 244         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 245         POSTING_READ(lvds_encoder->reg);
 246 }
 247
 248 static int intel_lvds_mode_valid(struct drm_connector *connector,
 249                                  struct drm_display_mode *mode)
 250 {
 251         struct intel_connector *intel_connector = to_intel_connector(connector);
 252         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 253
 254         if (mode->hdisplay > fixed_mode->hdisplay)
 255                 return MODE_PANEL;
 256         if (mode->vdisplay > fixed_mode->vdisplay)
 257                 return MODE_PANEL;
 258
 259         return MODE_OK;
 260 }
 261
 262 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 263                                       struct intel_crtc_config *pipe_config)
 264 {
 265         struct drm_device *dev = intel_encoder->base.dev;
 266         struct drm_i915_private *dev_priv = dev->dev_private;
 267         struct intel_lvds_encoder *lvds_encoder =
 268                 to_lvds_encoder(&intel_encoder->base);
 269         struct intel_connector *intel_connector =
 270                 &lvds_encoder->attached_connector->base;
 271         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 272         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 273         unsigned int lvds_bpp;
 274
 275         /* Should never happen!! */
 276         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 277                 DRM_ERROR("Can't support LVDS on pipe A\n");
 278                 return false;
 279         }
 280
 281         if ((I915_READ(lvds_encoder->reg) & LVDS_A3_POWER_MASK) ==
 282             LVDS_A3_POWER_UP)
 283                 lvds_bpp = 8*3;
 284         else
 285                 lvds_bpp = 6*3;
 286
 287         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 288                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 289                               pipe_config->pipe_bpp, lvds_bpp);
 290                 pipe_config->pipe_bpp = lvds_bpp;
 291         }
 292
 293         /*
 294          * We have timings from the BIOS for the panel, put them in
 295          * to the adjusted mode.  The CRTC will be set up for this mode,
 296          * with the panel scaling set up to source from the H/VDisplay
 297          * of the original mode.
 298          */
 299         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 300                                adjusted_mode);
 301
 302         if (HAS_PCH_SPLIT(dev)) {
 303                 pipe_config->has_pch_encoder = true;
 304
 305                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 306                                         intel_connector->panel.fitting_mode);
 307         } else {
 308                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 309                                          intel_connector->panel.fitting_mode);
 310
 311         }
 312
 313         /*
 314          * XXX: It would be nice to support lower refresh rates on the
 315          * panels to reduce power consumption, and perhaps match the
 316          * user's requested refresh rate.
 317          */
 318
 319         return true;
 320 }
 321
 322 static void intel_lvds_mode_set(struct intel_encoder *encoder)
 323 {
 324         /*
 325          * We don't do anything here, the LVDS port is fully set up in the pre
 326          * enable hook - the ordering constraints for enabling the lvds port vs.
 327          * enabling the display pll are too strict.
 328          */
 329 }
 330
 331 /**
 332  * Detect the LVDS connection.
 333  *
 334  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 335  * connected and closed means disconnected.  We also send hotplug events as
 336  * needed, using lid status notification from the input layer.
 337  */
 338 static enum drm_connector_status
 339 intel_lvds_detect(struct drm_connector *connector, bool force)
 340 {
 341         struct drm_device *dev = connector->dev;
 342         enum drm_connector_status status;
 343
 344         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 345                       connector->base.id, drm_get_connector_name(connector));
 346
 347         status = intel_panel_detect(dev);
 348         if (status != connector_status_unknown)
 349                 return status;
 350
 351         return connector_status_connected;
 352 }
 353
 354 /**
 355  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 356  */
 357 static int intel_lvds_get_modes(struct drm_connector *connector)
 358 {
 359         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 360         struct drm_device *dev = connector->dev;
 361         struct drm_display_mode *mode;
 362
 363         /* use cached edid if we have one */
 364         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 365                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 366
 367         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 368         if (mode == NULL)
 369                 return 0;
 370
 371         drm_mode_probed_add(connector, mode);
 372         return 1;
 373 }
 374
 375 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 376 {
 377         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 378         return 1;
 379 }
 380
 381 /* The GPU hangs up on these systems if modeset is performed on LID open */
 382 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 383         {
 384                 .callback = intel_no_modeset_on_lid_dmi_callback,
 385                 .ident = "Toshiba Tecra A11",
 386                 .matches = {
 387                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 388                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 389                 },
 390         },
 391
 392         { }     /* terminating entry */
 393 };
 394
 395 /*
 396  * Lid events. Note the use of 'modeset':
 397  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 398  *    and set it to MODESET_DONE on open
 399  *  - we use it as a "only once" bit (ie we ignore
 400  *    duplicate events where it was already properly set)
 401  *  - the suspend/resume paths will set it to
 402  *    MODESET_SUSPENDED and ignore the lid open event,
 403  *    because they restore the mode ("lid open").
 404  */
 405 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 406                             void *unused)
 407 {
 408         struct intel_lvds_connector *lvds_connector =
 409                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 410         struct drm_connector *connector = &lvds_connector->base.base;
 411         struct drm_device *dev = connector->dev;
 412         struct drm_i915_private *dev_priv = dev->dev_private;
 413
 414         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 415                 return NOTIFY_OK;
 416
 417         mutex_lock(&dev_priv->modeset_restore_lock);
 418         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 419                 goto exit;
 420         /*
 421          * check and update the status of LVDS connector after receiving
 422          * the LID nofication event.
 423          */
 424         connector->status = connector->funcs->detect(connector, false);
 425
 426         /* Don't force modeset on machines where it causes a GPU lockup */
 427         if (dmi_check_system(intel_no_modeset_on_lid))
 428                 goto exit;
 429         if (!acpi_lid_open()) {
 430                 /* do modeset on next lid open event */
 431                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 432                 goto exit;
 433         }
 434
 435         if (dev_priv->modeset_restore == MODESET_DONE)
 436                 goto exit;
 437
 438         drm_modeset_lock_all(dev);
 439         intel_modeset_setup_hw_state(dev, true);
 440         drm_modeset_unlock_all(dev);
 441
 442         dev_priv->modeset_restore = MODESET_DONE;
 443
 444 exit:
 445         mutex_unlock(&dev_priv->modeset_restore_lock);
 446         return NOTIFY_OK;
 447 }
 448
 449 /**
 450  * intel_lvds_destroy - unregister and free LVDS structures
 451  * @connector: connector to free
 452  *
 453  * Unregister the DDC bus for this connector then free the driver private
 454  * structure.
 455  */
 456 static void intel_lvds_destroy(struct drm_connector *connector)
 457 {
 458         struct intel_lvds_connector *lvds_connector =
 459                 to_lvds_connector(connector);
 460
 461         if (lvds_connector->lid_notifier.notifier_call)
 462                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 463
 464         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 465                 kfree(lvds_connector->base.edid);
 466
 467         intel_panel_fini(&lvds_connector->base.panel);
 468
 469         drm_sysfs_connector_remove(connector);
 470         drm_connector_cleanup(connector);
 471         kfree(connector);
 472 }
 473
 474 static int intel_lvds_set_property(struct drm_connector *connector,
 475                                    struct drm_property *property,
 476                                    uint64_t value)
 477 {
 478         struct intel_connector *intel_connector = to_intel_connector(connector);
 479         struct drm_device *dev = connector->dev;
 480
 481         if (property == dev->mode_config.scaling_mode_property) {
 482                 struct drm_crtc *crtc;
 483
 484                 if (value == DRM_MODE_SCALE_NONE) {
 485                         DRM_DEBUG_KMS("no scaling not supported\n");
 486                         return -EINVAL;
 487                 }
 488
 489                 if (intel_connector->panel.fitting_mode == value) {
 490                         /* the LVDS scaling property is not changed */
 491                         return 0;
 492                 }
 493                 intel_connector->panel.fitting_mode = value;
 494
 495                 crtc = intel_attached_encoder(connector)->base.crtc;
 496                 if (crtc && crtc->enabled) {
 497                         /*
 498                          * If the CRTC is enabled, the display will be changed
 499                          * according to the new panel fitting mode.
 500                          */
 501                         intel_crtc_restore_mode(crtc);
 502                 }
 503         }
 504
 505         return 0;
 506 }
 507
 508 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 509         .get_modes = intel_lvds_get_modes,
 510         .mode_valid = intel_lvds_mode_valid,
 511         .best_encoder = intel_best_encoder,
 512 };
 513
 514 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 515         .dpms = intel_connector_dpms,
 516         .detect = intel_lvds_detect,
 517         .fill_modes = drm_helper_probe_single_connector_modes,
 518         .set_property = intel_lvds_set_property,
 519         .destroy = intel_lvds_destroy,
 520 };
 521
 522 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 523         .destroy = intel_encoder_destroy,
 524 };
 525
 526 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 527 {
 528         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 529         return 1;
 530 }
 531
 532 /* These systems claim to have LVDS, but really don't */
 533 static const struct dmi_system_id intel_no_lvds[] = {
 534         {
 535                 .callback = intel_no_lvds_dmi_callback,
 536                 .ident = "Apple Mac Mini (Core series)",
 537                 .matches = {
 538                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 539                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 540                 },
 541         },
 542         {
 543                 .callback = intel_no_lvds_dmi_callback,
 544                 .ident = "Apple Mac Mini (Core 2 series)",
 545                 .matches = {
 546                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 547                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 548                 },
 549         },
 550         {
 551                 .callback = intel_no_lvds_dmi_callback,
 552                 .ident = "MSI IM-945GSE-A",
 553                 .matches = {
 554                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 555                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 556                 },
 557         },
 558         {
 559                 .callback = intel_no_lvds_dmi_callback,
 560                 .ident = "Dell Studio Hybrid",
 561                 .matches = {
 562                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 563                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 564                 },
 565         },
 566         {
 567                 .callback = intel_no_lvds_dmi_callback,
 568                 .ident = "Dell OptiPlex FX170",
 569                 .matches = {
 570                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 571                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 572                 },
 573         },
 574         {
 575                 .callback = intel_no_lvds_dmi_callback,
 576                 .ident = "AOpen Mini PC",
 577                 .matches = {
 578                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 579                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 580                 },
 581         },
 582         {
 583                 .callback = intel_no_lvds_dmi_callback,
 584                 .ident = "AOpen Mini PC MP915",
 585                 .matches = {
 586                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 587                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 588                 },
 589         },
 590         {
 591                 .callback = intel_no_lvds_dmi_callback,
 592                 .ident = "AOpen i915GMm-HFS",
 593                 .matches = {
 594                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 595                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 596                 },
 597         },
 598         {
 599                 .callback = intel_no_lvds_dmi_callback,
 600                 .ident = "AOpen i45GMx-I",
 601                 .matches = {
 602                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 603                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 604                 },
 605         },
 606         {
 607                 .callback = intel_no_lvds_dmi_callback,
 608                 .ident = "Aopen i945GTt-VFA",
 609                 .matches = {
 610                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 611                 },
 612         },
 613         {
 614                 .callback = intel_no_lvds_dmi_callback,
 615                 .ident = "Clientron U800",
 616                 .matches = {
 617                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 618                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 619                 },
 620         },
 621         {
 622                 .callback = intel_no_lvds_dmi_callback,
 623                 .ident = "Clientron E830",
 624                 .matches = {
 625                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 626                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 627                 },
 628         },
 629         {
 630                 .callback = intel_no_lvds_dmi_callback,
 631                 .ident = "Asus EeeBox PC EB1007",
 632                 .matches = {
 633                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 634                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 635                 },
 636         },
 637         {
 638                 .callback = intel_no_lvds_dmi_callback,
 639                 .ident = "Asus AT5NM10T-I",
 640                 .matches = {
 641                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 642                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 643                 },
 644         },
 645         {
 646                 .callback = intel_no_lvds_dmi_callback,
 647                 .ident = "Hewlett-Packard HP t5740",
 648                 .matches = {
 649                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 650                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 651                 },
 652         },
 653         {
 654                 .callback = intel_no_lvds_dmi_callback,
 655                 .ident = "Hewlett-Packard t5745",
 656                 .matches = {
 657                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 658                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 659                 },
 660         },
 661         {
 662                 .callback = intel_no_lvds_dmi_callback,
 663                 .ident = "Hewlett-Packard st5747",
 664                 .matches = {
 665                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 666                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 667                 },
 668         },
 669         {
 670                 .callback = intel_no_lvds_dmi_callback,
 671                 .ident = "MSI Wind Box DC500",
 672                 .matches = {
 673                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 674                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 675                 },
 676         },
 677         {
 678                 .callback = intel_no_lvds_dmi_callback,
 679                 .ident = "Gigabyte GA-D525TUD",
 680                 .matches = {
 681                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 682                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 683                 },
 684         },
 685         {
 686                 .callback = intel_no_lvds_dmi_callback,
 687                 .ident = "Supermicro X7SPA-H",
 688                 .matches = {
 689                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 690                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 691                 },
 692         },
 693         {
 694                 .callback = intel_no_lvds_dmi_callback,
 695                 .ident = "Fujitsu Esprimo Q900",
 696                 .matches = {
 697                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 698                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 699                 },
 700         },
 701         {
 702                 .callback = intel_no_lvds_dmi_callback,
 703                 .ident = "Intel D510MO",
 704                 .matches = {
 705                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 706                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 707                 },
 708         },
 709         {
 710                 .callback = intel_no_lvds_dmi_callback,
 711                 .ident = "Intel D525MW",
 712                 .matches = {
 713                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 714                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 715                 },
 716         },
 717
 718         { }     /* terminating entry */
 719 };
 720
 721 /**
 722  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 723  * @dev: drm device
 724  * @connector: LVDS connector
 725  *
 726  * Find the reduced downclock for LVDS in EDID.
 727  */
 728 static void intel_find_lvds_downclock(struct drm_device *dev,
 729                                       struct drm_display_mode *fixed_mode,
 730                                       struct drm_connector *connector)
 731 {
 732         struct drm_i915_private *dev_priv = dev->dev_private;
 733         struct drm_display_mode *scan;
 734         int temp_downclock;
 735
 736         temp_downclock = fixed_mode->clock;
 737         list_for_each_entry(scan, &connector->probed_modes, head) {
 738                 /*
 739                  * If one mode has the same resolution with the fixed_panel
 740                  * mode while they have the different refresh rate, it means
 741                  * that the reduced downclock is found for the LVDS. In such
 742                  * case we can set the different FPx0/1 to dynamically select
 743                  * between low and high frequency.
 744                  */
 745                 if (scan->hdisplay == fixed_mode->hdisplay &&
 746                     scan->hsync_start == fixed_mode->hsync_start &&
 747                     scan->hsync_end == fixed_mode->hsync_end &&
 748                     scan->htotal == fixed_mode->htotal &&
 749                     scan->vdisplay == fixed_mode->vdisplay &&
 750                     scan->vsync_start == fixed_mode->vsync_start &&
 751                     scan->vsync_end == fixed_mode->vsync_end &&
 752                     scan->vtotal == fixed_mode->vtotal) {
 753                         if (scan->clock < temp_downclock) {
 754                                 /*
 755                                  * The downclock is already found. But we
 756                                  * expect to find the lower downclock.
 757                                  */
 758                                 temp_downclock = scan->clock;
 759                         }
 760                 }
 761         }
 762         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 763                 /* We found the downclock for LVDS. */
 764                 dev_priv->lvds_downclock_avail = 1;
 765                 dev_priv->lvds_downclock = temp_downclock;
 766                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 767                               "Normal clock %dKhz, downclock %dKhz\n",
 768                               fixed_mode->clock, temp_downclock);
 769         }
 770 }
 771
 772 /*
 773  * Enumerate the child dev array parsed from VBT to check whether
 774  * the LVDS is present.
 775  * If it is present, return 1.
 776  * If it is not present, return false.
 777  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 778  */
 779 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 780                                    u8 *i2c_pin)
 781 {
 782         struct drm_i915_private *dev_priv = dev->dev_private;
 783         int i;
 784
 785         if (!dev_priv->vbt.child_dev_num)
 786                 return true;
 787
 788         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 789                 struct child_device_config *child = dev_priv->vbt.child_dev + i;
 790
 791                 /* If the device type is not LFP, continue.
 792                  * We have to check both the new identifiers as well as the
 793                  * old for compatibility with some BIOSes.
 794                  */
 795                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 796                     child->device_type != DEVICE_TYPE_LFP)
 797                         continue;
 798
 799                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 800                         *i2c_pin = child->i2c_pin;
 801
 802                 /* However, we cannot trust the BIOS writers to populate
 803                  * the VBT correctly.  Since LVDS requires additional
 804                  * information from AIM blocks, a non-zero addin offset is
 805                  * a good indicator that the LVDS is actually present.
 806                  */
 807                 if (child->addin_offset)
 808                         return true;
 809
 810                 /* But even then some BIOS writers perform some black magic
 811                  * and instantiate the device without reference to any
 812                  * additional data.  Trust that if the VBT was written into
 813                  * the OpRegion then they have validated the LVDS's existence.
 814                  */
 815                 if (dev_priv->opregion.vbt)
 816                         return true;
 817         }
 818
 819         return false;
 820 }
 821
 822 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 823 {
 824         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 825         return 1;
 826 }
 827
 828 static const struct dmi_system_id intel_dual_link_lvds[] = {
 829         {
 830                 .callback = intel_dual_link_lvds_callback,
 831                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 832                 .matches = {
 833                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 834                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 835                 },
 836         },
 837         { }     /* terminating entry */
 838 };
 839
 840 bool intel_is_dual_link_lvds(struct drm_device *dev)
 841 {
 842         struct intel_encoder *encoder;
 843         struct intel_lvds_encoder *lvds_encoder;
 844
 845         list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 846                             base.head) {
 847                 if (encoder->type == INTEL_OUTPUT_LVDS) {
 848                         lvds_encoder = to_lvds_encoder(&encoder->base);
 849
 850                         return lvds_encoder->is_dual_link;
 851                 }
 852         }
 853
 854         return false;
 855 }
 856
 857 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 858 {
 859         struct drm_device *dev = lvds_encoder->base.base.dev;
 860         unsigned int val;
 861         struct drm_i915_private *dev_priv = dev->dev_private;
 862
 863         /* use the module option value if specified */
 864         if (i915_lvds_channel_mode > 0)
 865                 return i915_lvds_channel_mode == 2;
 866
 867         if (dmi_check_system(intel_dual_link_lvds))
 868                 return true;
 869
 870         /* BIOS should set the proper LVDS register value at boot, but
 871          * in reality, it doesn't set the value when the lid is closed;
 872          * we need to check "the value to be set" in VBT when LVDS
 873          * register is uninitialized.
 874          */
 875         val = I915_READ(lvds_encoder->reg);
 876         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 877                 val = dev_priv->vbt.bios_lvds_val;
 878
 879         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 880 }
 881
 882 static bool intel_lvds_supported(struct drm_device *dev)
 883 {
 884         /* With the introduction of the PCH we gained a dedicated
 885          * LVDS presence pin, use it. */
 886         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 887                 return true;
 888
 889         /* Otherwise LVDS was only attached to mobile products,
 890          * except for the inglorious 830gm */
 891         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 892                 return true;
 893
 894         return false;
 895 }
 896
 897 /**
 898  * intel_lvds_init - setup LVDS connectors on this device
 899  * @dev: drm device
 900  *
 901  * Create the connector, register the LVDS DDC bus, and try to figure out what
 902  * modes we can display on the LVDS panel (if present).
 903  */
 904 void intel_lvds_init(struct drm_device *dev)
 905 {
 906         struct drm_i915_private *dev_priv = dev->dev_private;
 907         struct intel_lvds_encoder *lvds_encoder;
 908         struct intel_encoder *intel_encoder;
 909         struct intel_lvds_connector *lvds_connector;
 910         struct intel_connector *intel_connector;
 911         struct drm_connector *connector;
 912         struct drm_encoder *encoder;
 913         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 914         struct drm_display_mode *fixed_mode = NULL;
 915         struct edid *edid;
 916         struct drm_crtc *crtc;
 917         u32 lvds;
 918         int pipe;
 919         u8 pin;
 920
 921         if (!intel_lvds_supported(dev))
 922                 return;
 923
 924         /* Skip init on machines we know falsely report LVDS */
 925         if (dmi_check_system(intel_no_lvds))
 926                 return;
 927
 928         pin = GMBUS_PORT_PANEL;
 929         if (!lvds_is_present_in_vbt(dev, &pin)) {
 930                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 931                 return;
 932         }
 933
 934         if (HAS_PCH_SPLIT(dev)) {
 935                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 936                         return;
 937                 if (dev_priv->vbt.edp_support) {
 938                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 939                         return;
 940                 }
 941         }
 942
 943         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 944         if (!lvds_encoder)
 945                 return;
 946
 947         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 948         if (!lvds_connector) {
 949                 kfree(lvds_encoder);
 950                 return;
 951         }
 952
 953         lvds_encoder->attached_connector = lvds_connector;
 954
 955         intel_encoder = &lvds_encoder->base;
 956         encoder = &intel_encoder->base;
 957         intel_connector = &lvds_connector->base;
 958         connector = &intel_connector->base;
 959         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 960                            DRM_MODE_CONNECTOR_LVDS);
 961
 962         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 963                          DRM_MODE_ENCODER_LVDS);
 964
 965         intel_encoder->enable = intel_enable_lvds;
 966         intel_encoder->pre_enable = intel_pre_enable_lvds;
 967         intel_encoder->compute_config = intel_lvds_compute_config;
 968         intel_encoder->mode_set = intel_lvds_mode_set;
 969         intel_encoder->disable = intel_disable_lvds;
 970         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 971         intel_encoder->get_config = intel_lvds_get_config;
 972         intel_connector->get_hw_state = intel_connector_get_hw_state;
 973
 974         intel_connector_attach_encoder(intel_connector, intel_encoder);
 975         intel_encoder->type = INTEL_OUTPUT_LVDS;
 976
 977         intel_encoder->cloneable = false;
 978         if (HAS_PCH_SPLIT(dev))
 979                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 980         else if (IS_GEN4(dev))
 981                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 982         else
 983                 intel_encoder->crtc_mask = (1 << 1);
 984
 985         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 986         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 987         connector->interlace_allowed = false;
 988         connector->doublescan_allowed = false;
 989
 990         if (HAS_PCH_SPLIT(dev)) {
 991                 lvds_encoder->reg = PCH_LVDS;
 992         } else {
 993                 lvds_encoder->reg = LVDS;
 994         }
 995
 996         /* create the scaling mode property */
 997         drm_mode_create_scaling_mode_property(dev);
 998         drm_object_attach_property(&connector->base,
 999                                       dev->mode_config.scaling_mode_property,
1000                                       DRM_MODE_SCALE_ASPECT);
1001         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1002         /*
1003          * LVDS discovery:
1004          * 1) check for EDID on DDC
1005          * 2) check for VBT data
1006          * 3) check to see if LVDS is already on
1007          *    if none of the above, no panel
1008          * 4) make sure lid is open
1009          *    if closed, act like it's not there for now
1010          */
1011
1012         /*
1013          * Attempt to get the fixed panel mode from DDC.  Assume that the
1014          * preferred mode is the right one.
1015          */
1016         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1017         if (edid) {
1018                 if (drm_add_edid_modes(connector, edid)) {
1019                         drm_mode_connector_update_edid_property(connector,
1020                                                                 edid);
1021                 } else {
1022                         kfree(edid);
1023                         edid = ERR_PTR(-EINVAL);
1024                 }
1025         } else {
1026                 edid = ERR_PTR(-ENOENT);
1027         }
1028         lvds_connector->base.edid = edid;
1029
1030         if (IS_ERR_OR_NULL(edid)) {
1031                 /* Didn't get an EDID, so
1032                  * Set wide sync ranges so we get all modes
1033                  * handed to valid_mode for checking
1034                  */
1035                 connector->display_info.min_vfreq = 0;
1036                 connector->display_info.max_vfreq = 200;
1037                 connector->display_info.min_hfreq = 0;
1038                 connector->display_info.max_hfreq = 200;
1039         }
1040
1041         list_for_each_entry(scan, &connector->probed_modes, head) {
1042                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1043                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1044                         drm_mode_debug_printmodeline(scan);
1045
1046                         fixed_mode = drm_mode_duplicate(dev, scan);
1047                         if (fixed_mode) {
1048                                 intel_find_lvds_downclock(dev, fixed_mode,
1049                                                           connector);
1050                                 goto out;
1051                         }
1052                 }
1053         }
1054
1055         /* Failed to get EDID, what about VBT? */
1056         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1057                 DRM_DEBUG_KMS("using mode from VBT: ");
1058                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1059
1060                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1061                 if (fixed_mode) {
1062                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1063                         goto out;
1064                 }
1065         }
1066
1067         /*
1068          * If we didn't get EDID, try checking if the panel is already turned
1069          * on.  If so, assume that whatever is currently programmed is the
1070          * correct mode.
1071          */
1072
1073         /* Ironlake: FIXME if still fail, not try pipe mode now */
1074         if (HAS_PCH_SPLIT(dev))
1075                 goto failed;
1076
1077         lvds = I915_READ(LVDS);
1078         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1079         crtc = intel_get_crtc_for_pipe(dev, pipe);
1080
1081         if (crtc && (lvds & LVDS_PORT_EN)) {
1082                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1083                 if (fixed_mode) {
1084                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1085                         drm_mode_debug_printmodeline(fixed_mode);
1086                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1087                         goto out;
1088                 }
1089         }
1090
1091         /* If we still don't have a mode after all that, give up. */
1092         if (!fixed_mode)
1093                 goto failed;
1094
1095 out:
1096         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1097         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1098                       lvds_encoder->is_dual_link ? "dual" : "single");
1099
1100         /*
1101          * Unlock registers and just
1102          * leave them unlocked
1103          */
1104         if (HAS_PCH_SPLIT(dev)) {
1105                 I915_WRITE(PCH_PP_CONTROL,
1106                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1107         } else {
1108                 I915_WRITE(PP_CONTROL,
1109                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1110         }
1111         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1112         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1113                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1114                 lvds_connector->lid_notifier.notifier_call = NULL;
1115         }
1116         drm_sysfs_connector_add(connector);
1117
1118         intel_panel_init(&intel_connector->panel, fixed_mode);
1119         intel_panel_setup_backlight(connector);
1120
1121         return;
1122
1123 failed:
1124         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1125         drm_connector_cleanup(connector);
1126         drm_encoder_cleanup(encoder);
1127         if (fixed_mode)
1128                 drm_mode_destroy(dev, fixed_mode);
1129         kfree(lvds_encoder);
1130         kfree(lvds_connector);
1131         return;
1132 }