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 drm_encoder *encoder,
 323                                 struct drm_display_mode *mode,
 324                                 struct drm_display_mode *adjusted_mode)
 325 {
 326         /*
 327          * The LVDS pin pair will already have been turned on in the
 328          * intel_crtc_mode_set since it has a large impact on the DPLL
 329          * settings.
 330          */
 331 }
 332
 333 /**
 334  * Detect the LVDS connection.
 335  *
 336  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 337  * connected and closed means disconnected.  We also send hotplug events as
 338  * needed, using lid status notification from the input layer.
 339  */
 340 static enum drm_connector_status
 341 intel_lvds_detect(struct drm_connector *connector, bool force)
 342 {
 343         struct drm_device *dev = connector->dev;
 344         enum drm_connector_status status;
 345
 346         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 347                       connector->base.id, drm_get_connector_name(connector));
 348
 349         status = intel_panel_detect(dev);
 350         if (status != connector_status_unknown)
 351                 return status;
 352
 353         return connector_status_connected;
 354 }
 355
 356 /**
 357  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 358  */
 359 static int intel_lvds_get_modes(struct drm_connector *connector)
 360 {
 361         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 362         struct drm_device *dev = connector->dev;
 363         struct drm_display_mode *mode;
 364
 365         /* use cached edid if we have one */
 366         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 367                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 368
 369         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 370         if (mode == NULL)
 371                 return 0;
 372
 373         drm_mode_probed_add(connector, mode);
 374         return 1;
 375 }
 376
 377 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 378 {
 379         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 380         return 1;
 381 }
 382
 383 /* The GPU hangs up on these systems if modeset is performed on LID open */
 384 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 385         {
 386                 .callback = intel_no_modeset_on_lid_dmi_callback,
 387                 .ident = "Toshiba Tecra A11",
 388                 .matches = {
 389                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 390                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 391                 },
 392         },
 393
 394         { }     /* terminating entry */
 395 };
 396
 397 /*
 398  * Lid events. Note the use of 'modeset':
 399  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 400  *    and set it to MODESET_DONE on open
 401  *  - we use it as a "only once" bit (ie we ignore
 402  *    duplicate events where it was already properly set)
 403  *  - the suspend/resume paths will set it to
 404  *    MODESET_SUSPENDED and ignore the lid open event,
 405  *    because they restore the mode ("lid open").
 406  */
 407 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 408                             void *unused)
 409 {
 410         struct intel_lvds_connector *lvds_connector =
 411                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 412         struct drm_connector *connector = &lvds_connector->base.base;
 413         struct drm_device *dev = connector->dev;
 414         struct drm_i915_private *dev_priv = dev->dev_private;
 415
 416         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 417                 return NOTIFY_OK;
 418
 419         mutex_lock(&dev_priv->modeset_restore_lock);
 420         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 421                 goto exit;
 422         /*
 423          * check and update the status of LVDS connector after receiving
 424          * the LID nofication event.
 425          */
 426         connector->status = connector->funcs->detect(connector, false);
 427
 428         /* Don't force modeset on machines where it causes a GPU lockup */
 429         if (dmi_check_system(intel_no_modeset_on_lid))
 430                 goto exit;
 431         if (!acpi_lid_open()) {
 432                 /* do modeset on next lid open event */
 433                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 434                 goto exit;
 435         }
 436
 437         if (dev_priv->modeset_restore == MODESET_DONE)
 438                 goto exit;
 439
 440         drm_modeset_lock_all(dev);
 441         intel_modeset_setup_hw_state(dev, true);
 442         drm_modeset_unlock_all(dev);
 443
 444         dev_priv->modeset_restore = MODESET_DONE;
 445
 446 exit:
 447         mutex_unlock(&dev_priv->modeset_restore_lock);
 448         return NOTIFY_OK;
 449 }
 450
 451 /**
 452  * intel_lvds_destroy - unregister and free LVDS structures
 453  * @connector: connector to free
 454  *
 455  * Unregister the DDC bus for this connector then free the driver private
 456  * structure.
 457  */
 458 static void intel_lvds_destroy(struct drm_connector *connector)
 459 {
 460         struct intel_lvds_connector *lvds_connector =
 461                 to_lvds_connector(connector);
 462
 463         if (lvds_connector->lid_notifier.notifier_call)
 464                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 465
 466         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 467                 kfree(lvds_connector->base.edid);
 468
 469         intel_panel_fini(&lvds_connector->base.panel);
 470
 471         drm_sysfs_connector_remove(connector);
 472         drm_connector_cleanup(connector);
 473         kfree(connector);
 474 }
 475
 476 static int intel_lvds_set_property(struct drm_connector *connector,
 477                                    struct drm_property *property,
 478                                    uint64_t value)
 479 {
 480         struct intel_connector *intel_connector = to_intel_connector(connector);
 481         struct drm_device *dev = connector->dev;
 482
 483         if (property == dev->mode_config.scaling_mode_property) {
 484                 struct drm_crtc *crtc;
 485
 486                 if (value == DRM_MODE_SCALE_NONE) {
 487                         DRM_DEBUG_KMS("no scaling not supported\n");
 488                         return -EINVAL;
 489                 }
 490
 491                 if (intel_connector->panel.fitting_mode == value) {
 492                         /* the LVDS scaling property is not changed */
 493                         return 0;
 494                 }
 495                 intel_connector->panel.fitting_mode = value;
 496
 497                 crtc = intel_attached_encoder(connector)->base.crtc;
 498                 if (crtc && crtc->enabled) {
 499                         /*
 500                          * If the CRTC is enabled, the display will be changed
 501                          * according to the new panel fitting mode.
 502                          */
 503                         intel_crtc_restore_mode(crtc);
 504                 }
 505         }
 506
 507         return 0;
 508 }
 509
 510 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 511         .mode_set = intel_lvds_mode_set,
 512 };
 513
 514 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 515         .get_modes = intel_lvds_get_modes,
 516         .mode_valid = intel_lvds_mode_valid,
 517         .best_encoder = intel_best_encoder,
 518 };
 519
 520 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 521         .dpms = intel_connector_dpms,
 522         .detect = intel_lvds_detect,
 523         .fill_modes = drm_helper_probe_single_connector_modes,
 524         .set_property = intel_lvds_set_property,
 525         .destroy = intel_lvds_destroy,
 526 };
 527
 528 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 529         .destroy = intel_encoder_destroy,
 530 };
 531
 532 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 533 {
 534         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 535         return 1;
 536 }
 537
 538 /* These systems claim to have LVDS, but really don't */
 539 static const struct dmi_system_id intel_no_lvds[] = {
 540         {
 541                 .callback = intel_no_lvds_dmi_callback,
 542                 .ident = "Apple Mac Mini (Core series)",
 543                 .matches = {
 544                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 545                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 546                 },
 547         },
 548         {
 549                 .callback = intel_no_lvds_dmi_callback,
 550                 .ident = "Apple Mac Mini (Core 2 series)",
 551                 .matches = {
 552                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 553                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 554                 },
 555         },
 556         {
 557                 .callback = intel_no_lvds_dmi_callback,
 558                 .ident = "MSI IM-945GSE-A",
 559                 .matches = {
 560                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 561                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 562                 },
 563         },
 564         {
 565                 .callback = intel_no_lvds_dmi_callback,
 566                 .ident = "Dell Studio Hybrid",
 567                 .matches = {
 568                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 569                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 570                 },
 571         },
 572         {
 573                 .callback = intel_no_lvds_dmi_callback,
 574                 .ident = "Dell OptiPlex FX170",
 575                 .matches = {
 576                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 577                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 578                 },
 579         },
 580         {
 581                 .callback = intel_no_lvds_dmi_callback,
 582                 .ident = "AOpen Mini PC",
 583                 .matches = {
 584                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 585                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 586                 },
 587         },
 588         {
 589                 .callback = intel_no_lvds_dmi_callback,
 590                 .ident = "AOpen Mini PC MP915",
 591                 .matches = {
 592                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 593                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 594                 },
 595         },
 596         {
 597                 .callback = intel_no_lvds_dmi_callback,
 598                 .ident = "AOpen i915GMm-HFS",
 599                 .matches = {
 600                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 601                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 602                 },
 603         },
 604         {
 605                 .callback = intel_no_lvds_dmi_callback,
 606                 .ident = "AOpen i45GMx-I",
 607                 .matches = {
 608                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 609                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 610                 },
 611         },
 612         {
 613                 .callback = intel_no_lvds_dmi_callback,
 614                 .ident = "Aopen i945GTt-VFA",
 615                 .matches = {
 616                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 617                 },
 618         },
 619         {
 620                 .callback = intel_no_lvds_dmi_callback,
 621                 .ident = "Clientron U800",
 622                 .matches = {
 623                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 624                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 625                 },
 626         },
 627         {
 628                 .callback = intel_no_lvds_dmi_callback,
 629                 .ident = "Clientron E830",
 630                 .matches = {
 631                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 632                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 633                 },
 634         },
 635         {
 636                 .callback = intel_no_lvds_dmi_callback,
 637                 .ident = "Asus EeeBox PC EB1007",
 638                 .matches = {
 639                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 640                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 641                 },
 642         },
 643         {
 644                 .callback = intel_no_lvds_dmi_callback,
 645                 .ident = "Asus AT5NM10T-I",
 646                 .matches = {
 647                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 648                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 649                 },
 650         },
 651         {
 652                 .callback = intel_no_lvds_dmi_callback,
 653                 .ident = "Hewlett-Packard HP t5740",
 654                 .matches = {
 655                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 656                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 657                 },
 658         },
 659         {
 660                 .callback = intel_no_lvds_dmi_callback,
 661                 .ident = "Hewlett-Packard t5745",
 662                 .matches = {
 663                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 664                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 665                 },
 666         },
 667         {
 668                 .callback = intel_no_lvds_dmi_callback,
 669                 .ident = "Hewlett-Packard st5747",
 670                 .matches = {
 671                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 672                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 673                 },
 674         },
 675         {
 676                 .callback = intel_no_lvds_dmi_callback,
 677                 .ident = "MSI Wind Box DC500",
 678                 .matches = {
 679                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 680                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 681                 },
 682         },
 683         {
 684                 .callback = intel_no_lvds_dmi_callback,
 685                 .ident = "Gigabyte GA-D525TUD",
 686                 .matches = {
 687                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 688                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 689                 },
 690         },
 691         {
 692                 .callback = intel_no_lvds_dmi_callback,
 693                 .ident = "Supermicro X7SPA-H",
 694                 .matches = {
 695                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 696                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 697                 },
 698         },
 699         {
 700                 .callback = intel_no_lvds_dmi_callback,
 701                 .ident = "Fujitsu Esprimo Q900",
 702                 .matches = {
 703                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 704                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 705                 },
 706         },
 707         {
 708                 .callback = intel_no_lvds_dmi_callback,
 709                 .ident = "Intel D510MO",
 710                 .matches = {
 711                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 712                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 713                 },
 714         },
 715         {
 716                 .callback = intel_no_lvds_dmi_callback,
 717                 .ident = "Intel D525MW",
 718                 .matches = {
 719                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 720                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 721                 },
 722         },
 723
 724         { }     /* terminating entry */
 725 };
 726
 727 /**
 728  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 729  * @dev: drm device
 730  * @connector: LVDS connector
 731  *
 732  * Find the reduced downclock for LVDS in EDID.
 733  */
 734 static void intel_find_lvds_downclock(struct drm_device *dev,
 735                                       struct drm_display_mode *fixed_mode,
 736                                       struct drm_connector *connector)
 737 {
 738         struct drm_i915_private *dev_priv = dev->dev_private;
 739         struct drm_display_mode *scan;
 740         int temp_downclock;
 741
 742         temp_downclock = fixed_mode->clock;
 743         list_for_each_entry(scan, &connector->probed_modes, head) {
 744                 /*
 745                  * If one mode has the same resolution with the fixed_panel
 746                  * mode while they have the different refresh rate, it means
 747                  * that the reduced downclock is found for the LVDS. In such
 748                  * case we can set the different FPx0/1 to dynamically select
 749                  * between low and high frequency.
 750                  */
 751                 if (scan->hdisplay == fixed_mode->hdisplay &&
 752                     scan->hsync_start == fixed_mode->hsync_start &&
 753                     scan->hsync_end == fixed_mode->hsync_end &&
 754                     scan->htotal == fixed_mode->htotal &&
 755                     scan->vdisplay == fixed_mode->vdisplay &&
 756                     scan->vsync_start == fixed_mode->vsync_start &&
 757                     scan->vsync_end == fixed_mode->vsync_end &&
 758                     scan->vtotal == fixed_mode->vtotal) {
 759                         if (scan->clock < temp_downclock) {
 760                                 /*
 761                                  * The downclock is already found. But we
 762                                  * expect to find the lower downclock.
 763                                  */
 764                                 temp_downclock = scan->clock;
 765                         }
 766                 }
 767         }
 768         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 769                 /* We found the downclock for LVDS. */
 770                 dev_priv->lvds_downclock_avail = 1;
 771                 dev_priv->lvds_downclock = temp_downclock;
 772                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 773                               "Normal clock %dKhz, downclock %dKhz\n",
 774                               fixed_mode->clock, temp_downclock);
 775         }
 776 }
 777
 778 /*
 779  * Enumerate the child dev array parsed from VBT to check whether
 780  * the LVDS is present.
 781  * If it is present, return 1.
 782  * If it is not present, return false.
 783  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 784  */
 785 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 786                                    u8 *i2c_pin)
 787 {
 788         struct drm_i915_private *dev_priv = dev->dev_private;
 789         int i;
 790
 791         if (!dev_priv->vbt.child_dev_num)
 792                 return true;
 793
 794         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 795                 struct child_device_config *child = dev_priv->vbt.child_dev + i;
 796
 797                 /* If the device type is not LFP, continue.
 798                  * We have to check both the new identifiers as well as the
 799                  * old for compatibility with some BIOSes.
 800                  */
 801                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 802                     child->device_type != DEVICE_TYPE_LFP)
 803                         continue;
 804
 805                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 806                         *i2c_pin = child->i2c_pin;
 807
 808                 /* However, we cannot trust the BIOS writers to populate
 809                  * the VBT correctly.  Since LVDS requires additional
 810                  * information from AIM blocks, a non-zero addin offset is
 811                  * a good indicator that the LVDS is actually present.
 812                  */
 813                 if (child->addin_offset)
 814                         return true;
 815
 816                 /* But even then some BIOS writers perform some black magic
 817                  * and instantiate the device without reference to any
 818                  * additional data.  Trust that if the VBT was written into
 819                  * the OpRegion then they have validated the LVDS's existence.
 820                  */
 821                 if (dev_priv->opregion.vbt)
 822                         return true;
 823         }
 824
 825         return false;
 826 }
 827
 828 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 829 {
 830         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 831         return 1;
 832 }
 833
 834 static const struct dmi_system_id intel_dual_link_lvds[] = {
 835         {
 836                 .callback = intel_dual_link_lvds_callback,
 837                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 838                 .matches = {
 839                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 840                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 841                 },
 842         },
 843         { }     /* terminating entry */
 844 };
 845
 846 bool intel_is_dual_link_lvds(struct drm_device *dev)
 847 {
 848         struct intel_encoder *encoder;
 849         struct intel_lvds_encoder *lvds_encoder;
 850
 851         list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 852                             base.head) {
 853                 if (encoder->type == INTEL_OUTPUT_LVDS) {
 854                         lvds_encoder = to_lvds_encoder(&encoder->base);
 855
 856                         return lvds_encoder->is_dual_link;
 857                 }
 858         }
 859
 860         return false;
 861 }
 862
 863 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 864 {
 865         struct drm_device *dev = lvds_encoder->base.base.dev;
 866         unsigned int val;
 867         struct drm_i915_private *dev_priv = dev->dev_private;
 868
 869         /* use the module option value if specified */
 870         if (i915_lvds_channel_mode > 0)
 871                 return i915_lvds_channel_mode == 2;
 872
 873         if (dmi_check_system(intel_dual_link_lvds))
 874                 return true;
 875
 876         /* BIOS should set the proper LVDS register value at boot, but
 877          * in reality, it doesn't set the value when the lid is closed;
 878          * we need to check "the value to be set" in VBT when LVDS
 879          * register is uninitialized.
 880          */
 881         val = I915_READ(lvds_encoder->reg);
 882         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 883                 val = dev_priv->vbt.bios_lvds_val;
 884
 885         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 886 }
 887
 888 static bool intel_lvds_supported(struct drm_device *dev)
 889 {
 890         /* With the introduction of the PCH we gained a dedicated
 891          * LVDS presence pin, use it. */
 892         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 893                 return true;
 894
 895         /* Otherwise LVDS was only attached to mobile products,
 896          * except for the inglorious 830gm */
 897         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 898                 return true;
 899
 900         return false;
 901 }
 902
 903 /**
 904  * intel_lvds_init - setup LVDS connectors on this device
 905  * @dev: drm device
 906  *
 907  * Create the connector, register the LVDS DDC bus, and try to figure out what
 908  * modes we can display on the LVDS panel (if present).
 909  */
 910 void intel_lvds_init(struct drm_device *dev)
 911 {
 912         struct drm_i915_private *dev_priv = dev->dev_private;
 913         struct intel_lvds_encoder *lvds_encoder;
 914         struct intel_encoder *intel_encoder;
 915         struct intel_lvds_connector *lvds_connector;
 916         struct intel_connector *intel_connector;
 917         struct drm_connector *connector;
 918         struct drm_encoder *encoder;
 919         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 920         struct drm_display_mode *fixed_mode = NULL;
 921         struct edid *edid;
 922         struct drm_crtc *crtc;
 923         u32 lvds;
 924         int pipe;
 925         u8 pin;
 926
 927         if (!intel_lvds_supported(dev))
 928                 return;
 929
 930         /* Skip init on machines we know falsely report LVDS */
 931         if (dmi_check_system(intel_no_lvds))
 932                 return;
 933
 934         pin = GMBUS_PORT_PANEL;
 935         if (!lvds_is_present_in_vbt(dev, &pin)) {
 936                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 937                 return;
 938         }
 939
 940         if (HAS_PCH_SPLIT(dev)) {
 941                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 942                         return;
 943                 if (dev_priv->vbt.edp_support) {
 944                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 945                         return;
 946                 }
 947         }
 948
 949         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 950         if (!lvds_encoder)
 951                 return;
 952
 953         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 954         if (!lvds_connector) {
 955                 kfree(lvds_encoder);
 956                 return;
 957         }
 958
 959         lvds_encoder->attached_connector = lvds_connector;
 960
 961         intel_encoder = &lvds_encoder->base;
 962         encoder = &intel_encoder->base;
 963         intel_connector = &lvds_connector->base;
 964         connector = &intel_connector->base;
 965         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 966                            DRM_MODE_CONNECTOR_LVDS);
 967
 968         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 969                          DRM_MODE_ENCODER_LVDS);
 970
 971         intel_encoder->enable = intel_enable_lvds;
 972         intel_encoder->pre_enable = intel_pre_enable_lvds;
 973         intel_encoder->compute_config = intel_lvds_compute_config;
 974         intel_encoder->disable = intel_disable_lvds;
 975         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 976         intel_encoder->get_config = intel_lvds_get_config;
 977         intel_connector->get_hw_state = intel_connector_get_hw_state;
 978
 979         intel_connector_attach_encoder(intel_connector, intel_encoder);
 980         intel_encoder->type = INTEL_OUTPUT_LVDS;
 981
 982         intel_encoder->cloneable = false;
 983         if (HAS_PCH_SPLIT(dev))
 984                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 985         else if (IS_GEN4(dev))
 986                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 987         else
 988                 intel_encoder->crtc_mask = (1 << 1);
 989
 990         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 991         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 992         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 993         connector->interlace_allowed = false;
 994         connector->doublescan_allowed = false;
 995
 996         if (HAS_PCH_SPLIT(dev)) {
 997                 lvds_encoder->reg = PCH_LVDS;
 998         } else {
 999                 lvds_encoder->reg = LVDS;
1000         }
1001
1002         /* create the scaling mode property */
1003         drm_mode_create_scaling_mode_property(dev);
1004         drm_object_attach_property(&connector->base,
1005                                       dev->mode_config.scaling_mode_property,
1006                                       DRM_MODE_SCALE_ASPECT);
1007         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1008         /*
1009          * LVDS discovery:
1010          * 1) check for EDID on DDC
1011          * 2) check for VBT data
1012          * 3) check to see if LVDS is already on
1013          *    if none of the above, no panel
1014          * 4) make sure lid is open
1015          *    if closed, act like it's not there for now
1016          */
1017
1018         /*
1019          * Attempt to get the fixed panel mode from DDC.  Assume that the
1020          * preferred mode is the right one.
1021          */
1022         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1023         if (edid) {
1024                 if (drm_add_edid_modes(connector, edid)) {
1025                         drm_mode_connector_update_edid_property(connector,
1026                                                                 edid);
1027                 } else {
1028                         kfree(edid);
1029                         edid = ERR_PTR(-EINVAL);
1030                 }
1031         } else {
1032                 edid = ERR_PTR(-ENOENT);
1033         }
1034         lvds_connector->base.edid = edid;
1035
1036         if (IS_ERR_OR_NULL(edid)) {
1037                 /* Didn't get an EDID, so
1038                  * Set wide sync ranges so we get all modes
1039                  * handed to valid_mode for checking
1040                  */
1041                 connector->display_info.min_vfreq = 0;
1042                 connector->display_info.max_vfreq = 200;
1043                 connector->display_info.min_hfreq = 0;
1044                 connector->display_info.max_hfreq = 200;
1045         }
1046
1047         list_for_each_entry(scan, &connector->probed_modes, head) {
1048                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1049                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1050                         drm_mode_debug_printmodeline(scan);
1051
1052                         fixed_mode = drm_mode_duplicate(dev, scan);
1053                         if (fixed_mode) {
1054                                 intel_find_lvds_downclock(dev, fixed_mode,
1055                                                           connector);
1056                                 goto out;
1057                         }
1058                 }
1059         }
1060
1061         /* Failed to get EDID, what about VBT? */
1062         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1063                 DRM_DEBUG_KMS("using mode from VBT: ");
1064                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1065
1066                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1067                 if (fixed_mode) {
1068                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1069                         goto out;
1070                 }
1071         }
1072
1073         /*
1074          * If we didn't get EDID, try checking if the panel is already turned
1075          * on.  If so, assume that whatever is currently programmed is the
1076          * correct mode.
1077          */
1078
1079         /* Ironlake: FIXME if still fail, not try pipe mode now */
1080         if (HAS_PCH_SPLIT(dev))
1081                 goto failed;
1082
1083         lvds = I915_READ(LVDS);
1084         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1085         crtc = intel_get_crtc_for_pipe(dev, pipe);
1086
1087         if (crtc && (lvds & LVDS_PORT_EN)) {
1088                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1089                 if (fixed_mode) {
1090                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1091                         drm_mode_debug_printmodeline(fixed_mode);
1092                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1093                         goto out;
1094                 }
1095         }
1096
1097         /* If we still don't have a mode after all that, give up. */
1098         if (!fixed_mode)
1099                 goto failed;
1100
1101 out:
1102         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1103         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1104                       lvds_encoder->is_dual_link ? "dual" : "single");
1105
1106         /*
1107          * Unlock registers and just
1108          * leave them unlocked
1109          */
1110         if (HAS_PCH_SPLIT(dev)) {
1111                 I915_WRITE(PCH_PP_CONTROL,
1112                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1113         } else {
1114                 I915_WRITE(PP_CONTROL,
1115                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1116         }
1117         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1118         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1119                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1120                 lvds_connector->lid_notifier.notifier_call = NULL;
1121         }
1122         drm_sysfs_connector_add(connector);
1123
1124         intel_panel_init(&intel_connector->panel, fixed_mode);
1125         intel_panel_setup_backlight(connector);
1126
1127         return;
1128
1129 failed:
1130         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1131         drm_connector_cleanup(connector);
1132         drm_encoder_cleanup(encoder);
1133         if (fixed_mode)
1134                 drm_mode_destroy(dev, fixed_mode);
1135         kfree(lvds_encoder);
1136         kfree(lvds_connector);
1137         return;
1138 }