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 <linux/vga_switcheroo.h>
  35 #include <drm/drmP.h>
  36 #include <drm/drm_atomic_helper.h>
  37 #include <drm/drm_crtc.h>
  38 #include <drm/drm_edid.h>
  39 #include "intel_drv.h"
  40 #include <drm/i915_drm.h>
  41 #include "i915_drv.h"
  42 #include <linux/acpi.h>
  43
  44 /* Private structure for the integrated LVDS support */
  45 struct intel_lvds_connector {
  46         struct intel_connector base;
  47
  48         struct notifier_block lid_notifier;
  49 };
  50
  51 struct intel_lvds_pps {
  52         /* 100us units */
  53         int t1_t2;
  54         int t3;
  55         int t4;
  56         int t5;
  57         int tx;
  58
  59         int divider;
  60
  61         int port;
  62         bool powerdown_on_reset;
  63 };
  64
  65 struct intel_lvds_encoder {
  66         struct intel_encoder base;
  67
  68         bool is_dual_link;
  69         i915_reg_t reg;
  70         u32 a3_power;
  71
  72         struct intel_lvds_pps init_pps;
  73         u32 init_lvds_val;
  74
  75         struct intel_lvds_connector *attached_connector;
  76 };
  77
  78 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  79 {
  80         return container_of(encoder, struct intel_lvds_encoder, base.base);
  81 }
  82
  83 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  84 {
  85         return container_of(connector, struct intel_lvds_connector, base.base);
  86 }
  87
  88 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  89                                     enum pipe *pipe)
  90 {
  91         struct drm_device *dev = encoder->base.dev;
  92         struct drm_i915_private *dev_priv = to_i915(dev);
  93         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  94         enum intel_display_power_domain power_domain;
  95         u32 tmp;
  96         bool ret;
  97
  98         power_domain = intel_display_port_power_domain(encoder);
  99         if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
 100                 return false;
 101
 102         ret = false;
 103
 104         tmp = I915_READ(lvds_encoder->reg);
 105
 106         if (!(tmp & LVDS_PORT_EN))
 107                 goto out;
 108
 109         if (HAS_PCH_CPT(dev))
 110                 *pipe = PORT_TO_PIPE_CPT(tmp);
 111         else
 112                 *pipe = PORT_TO_PIPE(tmp);
 113
 114         ret = true;
 115
 116 out:
 117         intel_display_power_put(dev_priv, power_domain);
 118
 119         return ret;
 120 }
 121
 122 static void intel_lvds_get_config(struct intel_encoder *encoder,
 123                                   struct intel_crtc_state *pipe_config)
 124 {
 125         struct drm_device *dev = encoder->base.dev;
 126         struct drm_i915_private *dev_priv = to_i915(dev);
 127         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 128         u32 tmp, flags = 0;
 129
 130         tmp = I915_READ(lvds_encoder->reg);
 131         if (tmp & LVDS_HSYNC_POLARITY)
 132                 flags |= DRM_MODE_FLAG_NHSYNC;
 133         else
 134                 flags |= DRM_MODE_FLAG_PHSYNC;
 135         if (tmp & LVDS_VSYNC_POLARITY)
 136                 flags |= DRM_MODE_FLAG_NVSYNC;
 137         else
 138                 flags |= DRM_MODE_FLAG_PVSYNC;
 139
 140         pipe_config->base.adjusted_mode.flags |= flags;
 141
 142         if (INTEL_INFO(dev)->gen < 5)
 143                 pipe_config->gmch_pfit.lvds_border_bits =
 144                         tmp & LVDS_BORDER_ENABLE;
 145
 146         /* gen2/3 store dither state in pfit control, needs to match */
 147         if (INTEL_INFO(dev)->gen < 4) {
 148                 tmp = I915_READ(PFIT_CONTROL);
 149
 150                 pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
 151         }
 152
 153         pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
 154 }
 155
 156 static void intel_lvds_pps_get_hw_state(struct drm_i915_private *dev_priv,
 157                                         struct intel_lvds_pps *pps)
 158 {
 159         u32 val;
 160
 161         pps->powerdown_on_reset = I915_READ(PP_CONTROL(0)) & PANEL_POWER_RESET;
 162
 163         val = I915_READ(PP_ON_DELAYS(0));
 164         pps->port = (val & PANEL_PORT_SELECT_MASK) >>
 165                     PANEL_PORT_SELECT_SHIFT;
 166         pps->t1_t2 = (val & PANEL_POWER_UP_DELAY_MASK) >>
 167                      PANEL_POWER_UP_DELAY_SHIFT;
 168         pps->t5 = (val & PANEL_LIGHT_ON_DELAY_MASK) >>
 169                   PANEL_LIGHT_ON_DELAY_SHIFT;
 170
 171         val = I915_READ(PP_OFF_DELAYS(0));
 172         pps->t3 = (val & PANEL_POWER_DOWN_DELAY_MASK) >>
 173                   PANEL_POWER_DOWN_DELAY_SHIFT;
 174         pps->tx = (val & PANEL_LIGHT_OFF_DELAY_MASK) >>
 175                   PANEL_LIGHT_OFF_DELAY_SHIFT;
 176
 177         val = I915_READ(PP_DIVISOR(0));
 178         pps->divider = (val & PP_REFERENCE_DIVIDER_MASK) >>
 179                        PP_REFERENCE_DIVIDER_SHIFT;
 180         val = (val & PANEL_POWER_CYCLE_DELAY_MASK) >>
 181               PANEL_POWER_CYCLE_DELAY_SHIFT;
 182         /*
 183          * Remove the BSpec specified +1 (100ms) offset that accounts for a
 184          * too short power-cycle delay due to the asynchronous programming of
 185          * the register.
 186          */
 187         if (val)
 188                 val--;
 189         /* Convert from 100ms to 100us units */
 190         pps->t4 = val * 1000;
 191
 192         if (INTEL_INFO(dev_priv)->gen <= 4 &&
 193             pps->t1_t2 == 0 && pps->t5 == 0 && pps->t3 == 0 && pps->tx == 0) {
 194                 DRM_DEBUG_KMS("Panel power timings uninitialized, "
 195                               "setting defaults\n");
 196                 /* Set T2 to 40ms and T5 to 200ms in 100 usec units */
 197                 pps->t1_t2 = 40 * 10;
 198                 pps->t5 = 200 * 10;
 199                 /* Set T3 to 35ms and Tx to 200ms in 100 usec units */
 200                 pps->t3 = 35 * 10;
 201                 pps->tx = 200 * 10;
 202         }
 203
 204         DRM_DEBUG_DRIVER("LVDS PPS:t1+t2 %d t3 %d t4 %d t5 %d tx %d "
 205                          "divider %d port %d powerdown_on_reset %d\n",
 206                          pps->t1_t2, pps->t3, pps->t4, pps->t5, pps->tx,
 207                          pps->divider, pps->port, pps->powerdown_on_reset);
 208 }
 209
 210 static void intel_lvds_pps_init_hw(struct drm_i915_private *dev_priv,
 211                                    struct intel_lvds_pps *pps)
 212 {
 213         u32 val;
 214
 215         val = I915_READ(PP_CONTROL(0));
 216         WARN_ON((val & PANEL_UNLOCK_MASK) != PANEL_UNLOCK_REGS);
 217         if (pps->powerdown_on_reset)
 218                 val |= PANEL_POWER_RESET;
 219         I915_WRITE(PP_CONTROL(0), val);
 220
 221         I915_WRITE(PP_ON_DELAYS(0), (pps->port << PANEL_PORT_SELECT_SHIFT) |
 222                                     (pps->t1_t2 << PANEL_POWER_UP_DELAY_SHIFT) |
 223                                     (pps->t5 << PANEL_LIGHT_ON_DELAY_SHIFT));
 224         I915_WRITE(PP_OFF_DELAYS(0), (pps->t3 << PANEL_POWER_DOWN_DELAY_SHIFT) |
 225                                      (pps->tx << PANEL_LIGHT_OFF_DELAY_SHIFT));
 226
 227         val = pps->divider << PP_REFERENCE_DIVIDER_SHIFT;
 228         val |= (DIV_ROUND_UP(pps->t4, 1000) + 1) <<
 229                PANEL_POWER_CYCLE_DELAY_SHIFT;
 230         I915_WRITE(PP_DIVISOR(0), val);
 231 }
 232
 233 static void intel_pre_enable_lvds(struct intel_encoder *encoder,
 234                                   struct intel_crtc_state *pipe_config,
 235                                   struct drm_connector_state *conn_state)
 236 {
 237         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 238         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 239         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 240         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 241         int pipe = crtc->pipe;
 242         u32 temp;
 243
 244         if (HAS_PCH_SPLIT(dev_priv)) {
 245                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 246                 assert_shared_dpll_disabled(dev_priv,
 247                                             pipe_config->shared_dpll);
 248         } else {
 249                 assert_pll_disabled(dev_priv, pipe);
 250         }
 251
 252         intel_lvds_pps_init_hw(dev_priv, &lvds_encoder->init_pps);
 253
 254         temp = lvds_encoder->init_lvds_val;
 255         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 256
 257         if (HAS_PCH_CPT(dev_priv)) {
 258                 temp &= ~PORT_TRANS_SEL_MASK;
 259                 temp |= PORT_TRANS_SEL_CPT(pipe);
 260         } else {
 261                 if (pipe == 1) {
 262                         temp |= LVDS_PIPEB_SELECT;
 263                 } else {
 264                         temp &= ~LVDS_PIPEB_SELECT;
 265                 }
 266         }
 267
 268         /* set the corresponsding LVDS_BORDER bit */
 269         temp &= ~LVDS_BORDER_ENABLE;
 270         temp |= pipe_config->gmch_pfit.lvds_border_bits;
 271         /* Set the B0-B3 data pairs corresponding to whether we're going to
 272          * set the DPLLs for dual-channel mode or not.
 273          */
 274         if (lvds_encoder->is_dual_link)
 275                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 276         else
 277                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 278
 279         /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 280          * appropriately here, but we need to look more thoroughly into how
 281          * panels behave in the two modes. For now, let's just maintain the
 282          * value we got from the BIOS.
 283          */
 284         temp &= ~LVDS_A3_POWER_MASK;
 285         temp |= lvds_encoder->a3_power;
 286
 287         /* Set the dithering flag on LVDS as needed, note that there is no
 288          * special lvds dither control bit on pch-split platforms, dithering is
 289          * only controlled through the PIPECONF reg. */
 290         if (IS_GEN4(dev_priv)) {
 291                 /* Bspec wording suggests that LVDS port dithering only exists
 292                  * for 18bpp panels. */
 293                 if (pipe_config->dither && pipe_config->pipe_bpp == 18)
 294                         temp |= LVDS_ENABLE_DITHER;
 295                 else
 296                         temp &= ~LVDS_ENABLE_DITHER;
 297         }
 298         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 299         if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
 300                 temp |= LVDS_HSYNC_POLARITY;
 301         if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
 302                 temp |= LVDS_VSYNC_POLARITY;
 303
 304         I915_WRITE(lvds_encoder->reg, temp);
 305 }
 306
 307 /**
 308  * Sets the power state for the panel.
 309  */
 310 static void intel_enable_lvds(struct intel_encoder *encoder,
 311                               struct intel_crtc_state *pipe_config,
 312                               struct drm_connector_state *conn_state)
 313 {
 314         struct drm_device *dev = encoder->base.dev;
 315         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 316         struct intel_connector *intel_connector =
 317                 &lvds_encoder->attached_connector->base;
 318         struct drm_i915_private *dev_priv = to_i915(dev);
 319
 320         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 321
 322         I915_WRITE(PP_CONTROL(0), I915_READ(PP_CONTROL(0)) | PANEL_POWER_ON);
 323         POSTING_READ(lvds_encoder->reg);
 324         if (intel_wait_for_register(dev_priv, PP_STATUS(0), PP_ON, PP_ON, 1000))
 325                 DRM_ERROR("timed out waiting for panel to power on\n");
 326
 327         intel_panel_enable_backlight(intel_connector);
 328 }
 329
 330 static void intel_disable_lvds(struct intel_encoder *encoder,
 331                                struct intel_crtc_state *old_crtc_state,
 332                                struct drm_connector_state *old_conn_state)
 333 {
 334         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 335         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 336
 337         I915_WRITE(PP_CONTROL(0), I915_READ(PP_CONTROL(0)) & ~PANEL_POWER_ON);
 338         if (intel_wait_for_register(dev_priv, PP_STATUS(0), PP_ON, 0, 1000))
 339                 DRM_ERROR("timed out waiting for panel to power off\n");
 340
 341         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 342         POSTING_READ(lvds_encoder->reg);
 343 }
 344
 345 static void gmch_disable_lvds(struct intel_encoder *encoder,
 346                               struct intel_crtc_state *old_crtc_state,
 347                               struct drm_connector_state *old_conn_state)
 348
 349 {
 350         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 351         struct intel_connector *intel_connector =
 352                 &lvds_encoder->attached_connector->base;
 353
 354         intel_panel_disable_backlight(intel_connector);
 355
 356         intel_disable_lvds(encoder, old_crtc_state, old_conn_state);
 357 }
 358
 359 static void pch_disable_lvds(struct intel_encoder *encoder,
 360                              struct intel_crtc_state *old_crtc_state,
 361                              struct drm_connector_state *old_conn_state)
 362 {
 363         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 364         struct intel_connector *intel_connector =
 365                 &lvds_encoder->attached_connector->base;
 366
 367         intel_panel_disable_backlight(intel_connector);
 368 }
 369
 370 static void pch_post_disable_lvds(struct intel_encoder *encoder,
 371                                   struct intel_crtc_state *old_crtc_state,
 372                                   struct drm_connector_state *old_conn_state)
 373 {
 374         intel_disable_lvds(encoder, old_crtc_state, old_conn_state);
 375 }
 376
 377 static enum drm_mode_status
 378 intel_lvds_mode_valid(struct drm_connector *connector,
 379                       struct drm_display_mode *mode)
 380 {
 381         struct intel_connector *intel_connector = to_intel_connector(connector);
 382         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 383         int max_pixclk = to_i915(connector->dev)->max_dotclk_freq;
 384
 385         if (mode->hdisplay > fixed_mode->hdisplay)
 386                 return MODE_PANEL;
 387         if (mode->vdisplay > fixed_mode->vdisplay)
 388                 return MODE_PANEL;
 389         if (fixed_mode->clock > max_pixclk)
 390                 return MODE_CLOCK_HIGH;
 391
 392         return MODE_OK;
 393 }
 394
 395 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 396                                       struct intel_crtc_state *pipe_config,
 397                                       struct drm_connector_state *conn_state)
 398 {
 399         struct drm_device *dev = intel_encoder->base.dev;
 400         struct intel_lvds_encoder *lvds_encoder =
 401                 to_lvds_encoder(&intel_encoder->base);
 402         struct intel_connector *intel_connector =
 403                 &lvds_encoder->attached_connector->base;
 404         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 405         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
 406         unsigned int lvds_bpp;
 407
 408         /* Should never happen!! */
 409         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 410                 DRM_ERROR("Can't support LVDS on pipe A\n");
 411                 return false;
 412         }
 413
 414         if (lvds_encoder->a3_power == LVDS_A3_POWER_UP)
 415                 lvds_bpp = 8*3;
 416         else
 417                 lvds_bpp = 6*3;
 418
 419         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 420                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 421                               pipe_config->pipe_bpp, lvds_bpp);
 422                 pipe_config->pipe_bpp = lvds_bpp;
 423         }
 424
 425         /*
 426          * We have timings from the BIOS for the panel, put them in
 427          * to the adjusted mode.  The CRTC will be set up for this mode,
 428          * with the panel scaling set up to source from the H/VDisplay
 429          * of the original mode.
 430          */
 431         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 432                                adjusted_mode);
 433
 434         if (HAS_PCH_SPLIT(dev)) {
 435                 pipe_config->has_pch_encoder = true;
 436
 437                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 438                                         intel_connector->panel.fitting_mode);
 439         } else {
 440                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 441                                          intel_connector->panel.fitting_mode);
 442
 443         }
 444
 445         /*
 446          * XXX: It would be nice to support lower refresh rates on the
 447          * panels to reduce power consumption, and perhaps match the
 448          * user's requested refresh rate.
 449          */
 450
 451         return true;
 452 }
 453
 454 /**
 455  * Detect the LVDS connection.
 456  *
 457  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 458  * connected and closed means disconnected.  We also send hotplug events as
 459  * needed, using lid status notification from the input layer.
 460  */
 461 static enum drm_connector_status
 462 intel_lvds_detect(struct drm_connector *connector, bool force)
 463 {
 464         struct drm_device *dev = connector->dev;
 465         enum drm_connector_status status;
 466
 467         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 468                       connector->base.id, connector->name);
 469
 470         status = intel_panel_detect(dev);
 471         if (status != connector_status_unknown)
 472                 return status;
 473
 474         return connector_status_connected;
 475 }
 476
 477 /**
 478  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 479  */
 480 static int intel_lvds_get_modes(struct drm_connector *connector)
 481 {
 482         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 483         struct drm_device *dev = connector->dev;
 484         struct drm_display_mode *mode;
 485
 486         /* use cached edid if we have one */
 487         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 488                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 489
 490         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 491         if (mode == NULL)
 492                 return 0;
 493
 494         drm_mode_probed_add(connector, mode);
 495         return 1;
 496 }
 497
 498 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 499 {
 500         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 501         return 1;
 502 }
 503
 504 /* The GPU hangs up on these systems if modeset is performed on LID open */
 505 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 506         {
 507                 .callback = intel_no_modeset_on_lid_dmi_callback,
 508                 .ident = "Toshiba Tecra A11",
 509                 .matches = {
 510                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 511                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 512                 },
 513         },
 514
 515         { }     /* terminating entry */
 516 };
 517
 518 /*
 519  * Lid events. Note the use of 'modeset':
 520  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 521  *    and set it to MODESET_DONE on open
 522  *  - we use it as a "only once" bit (ie we ignore
 523  *    duplicate events where it was already properly set)
 524  *  - the suspend/resume paths will set it to
 525  *    MODESET_SUSPENDED and ignore the lid open event,
 526  *    because they restore the mode ("lid open").
 527  */
 528 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 529                             void *unused)
 530 {
 531         struct intel_lvds_connector *lvds_connector =
 532                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 533         struct drm_connector *connector = &lvds_connector->base.base;
 534         struct drm_device *dev = connector->dev;
 535         struct drm_i915_private *dev_priv = to_i915(dev);
 536
 537         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 538                 return NOTIFY_OK;
 539
 540         mutex_lock(&dev_priv->modeset_restore_lock);
 541         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 542                 goto exit;
 543         /*
 544          * check and update the status of LVDS connector after receiving
 545          * the LID nofication event.
 546          */
 547         connector->status = connector->funcs->detect(connector, false);
 548
 549         /* Don't force modeset on machines where it causes a GPU lockup */
 550         if (dmi_check_system(intel_no_modeset_on_lid))
 551                 goto exit;
 552         if (!acpi_lid_open()) {
 553                 /* do modeset on next lid open event */
 554                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 555                 goto exit;
 556         }
 557
 558         if (dev_priv->modeset_restore == MODESET_DONE)
 559                 goto exit;
 560
 561         /*
 562          * Some old platform's BIOS love to wreak havoc while the lid is closed.
 563          * We try to detect this here and undo any damage. The split for PCH
 564          * platforms is rather conservative and a bit arbitrary expect that on
 565          * those platforms VGA disabling requires actual legacy VGA I/O access,
 566          * and as part of the cleanup in the hw state restore we also redisable
 567          * the vga plane.
 568          */
 569         if (!HAS_PCH_SPLIT(dev))
 570                 intel_display_resume(dev);
 571
 572         dev_priv->modeset_restore = MODESET_DONE;
 573
 574 exit:
 575         mutex_unlock(&dev_priv->modeset_restore_lock);
 576         return NOTIFY_OK;
 577 }
 578
 579 /**
 580  * intel_lvds_destroy - unregister and free LVDS structures
 581  * @connector: connector to free
 582  *
 583  * Unregister the DDC bus for this connector then free the driver private
 584  * structure.
 585  */
 586 static void intel_lvds_destroy(struct drm_connector *connector)
 587 {
 588         struct intel_lvds_connector *lvds_connector =
 589                 to_lvds_connector(connector);
 590
 591         if (lvds_connector->lid_notifier.notifier_call)
 592                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 593
 594         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 595                 kfree(lvds_connector->base.edid);
 596
 597         intel_panel_fini(&lvds_connector->base.panel);
 598
 599         drm_connector_cleanup(connector);
 600         kfree(connector);
 601 }
 602
 603 static int intel_lvds_set_property(struct drm_connector *connector,
 604                                    struct drm_property *property,
 605                                    uint64_t value)
 606 {
 607         struct intel_connector *intel_connector = to_intel_connector(connector);
 608         struct drm_device *dev = connector->dev;
 609
 610         if (property == dev->mode_config.scaling_mode_property) {
 611                 struct drm_crtc *crtc;
 612
 613                 if (value == DRM_MODE_SCALE_NONE) {
 614                         DRM_DEBUG_KMS("no scaling not supported\n");
 615                         return -EINVAL;
 616                 }
 617
 618                 if (intel_connector->panel.fitting_mode == value) {
 619                         /* the LVDS scaling property is not changed */
 620                         return 0;
 621                 }
 622                 intel_connector->panel.fitting_mode = value;
 623
 624                 crtc = intel_attached_encoder(connector)->base.crtc;
 625                 if (crtc && crtc->state->enable) {
 626                         /*
 627                          * If the CRTC is enabled, the display will be changed
 628                          * according to the new panel fitting mode.
 629                          */
 630                         intel_crtc_restore_mode(crtc);
 631                 }
 632         }
 633
 634         return 0;
 635 }
 636
 637 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 638         .get_modes = intel_lvds_get_modes,
 639         .mode_valid = intel_lvds_mode_valid,
 640 };
 641
 642 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 643         .dpms = drm_atomic_helper_connector_dpms,
 644         .detect = intel_lvds_detect,
 645         .fill_modes = drm_helper_probe_single_connector_modes,
 646         .set_property = intel_lvds_set_property,
 647         .atomic_get_property = intel_connector_atomic_get_property,
 648         .late_register = intel_connector_register,
 649         .early_unregister = intel_connector_unregister,
 650         .destroy = intel_lvds_destroy,
 651         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 652         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 653 };
 654
 655 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 656         .destroy = intel_encoder_destroy,
 657 };
 658
 659 static int intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 660 {
 661         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 662         return 1;
 663 }
 664
 665 /* These systems claim to have LVDS, but really don't */
 666 static const struct dmi_system_id intel_no_lvds[] = {
 667         {
 668                 .callback = intel_no_lvds_dmi_callback,
 669                 .ident = "Apple Mac Mini (Core series)",
 670                 .matches = {
 671                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 672                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 673                 },
 674         },
 675         {
 676                 .callback = intel_no_lvds_dmi_callback,
 677                 .ident = "Apple Mac Mini (Core 2 series)",
 678                 .matches = {
 679                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 680                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 681                 },
 682         },
 683         {
 684                 .callback = intel_no_lvds_dmi_callback,
 685                 .ident = "MSI IM-945GSE-A",
 686                 .matches = {
 687                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 688                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 689                 },
 690         },
 691         {
 692                 .callback = intel_no_lvds_dmi_callback,
 693                 .ident = "Dell Studio Hybrid",
 694                 .matches = {
 695                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 696                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 697                 },
 698         },
 699         {
 700                 .callback = intel_no_lvds_dmi_callback,
 701                 .ident = "Dell OptiPlex FX170",
 702                 .matches = {
 703                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 704                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 705                 },
 706         },
 707         {
 708                 .callback = intel_no_lvds_dmi_callback,
 709                 .ident = "AOpen Mini PC",
 710                 .matches = {
 711                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 712                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 713                 },
 714         },
 715         {
 716                 .callback = intel_no_lvds_dmi_callback,
 717                 .ident = "AOpen Mini PC MP915",
 718                 .matches = {
 719                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 720                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 721                 },
 722         },
 723         {
 724                 .callback = intel_no_lvds_dmi_callback,
 725                 .ident = "AOpen i915GMm-HFS",
 726                 .matches = {
 727                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 728                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 729                 },
 730         },
 731         {
 732                 .callback = intel_no_lvds_dmi_callback,
 733                 .ident = "AOpen i45GMx-I",
 734                 .matches = {
 735                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 736                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 737                 },
 738         },
 739         {
 740                 .callback = intel_no_lvds_dmi_callback,
 741                 .ident = "Aopen i945GTt-VFA",
 742                 .matches = {
 743                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 744                 },
 745         },
 746         {
 747                 .callback = intel_no_lvds_dmi_callback,
 748                 .ident = "Clientron U800",
 749                 .matches = {
 750                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 751                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 752                 },
 753         },
 754         {
 755                 .callback = intel_no_lvds_dmi_callback,
 756                 .ident = "Clientron E830",
 757                 .matches = {
 758                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 759                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 760                 },
 761         },
 762         {
 763                 .callback = intel_no_lvds_dmi_callback,
 764                 .ident = "Asus EeeBox PC EB1007",
 765                 .matches = {
 766                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 767                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 768                 },
 769         },
 770         {
 771                 .callback = intel_no_lvds_dmi_callback,
 772                 .ident = "Asus AT5NM10T-I",
 773                 .matches = {
 774                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 775                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 776                 },
 777         },
 778         {
 779                 .callback = intel_no_lvds_dmi_callback,
 780                 .ident = "Hewlett-Packard HP t5740",
 781                 .matches = {
 782                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 783                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 784                 },
 785         },
 786         {
 787                 .callback = intel_no_lvds_dmi_callback,
 788                 .ident = "Hewlett-Packard t5745",
 789                 .matches = {
 790                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 791                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 792                 },
 793         },
 794         {
 795                 .callback = intel_no_lvds_dmi_callback,
 796                 .ident = "Hewlett-Packard st5747",
 797                 .matches = {
 798                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 799                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 800                 },
 801         },
 802         {
 803                 .callback = intel_no_lvds_dmi_callback,
 804                 .ident = "MSI Wind Box DC500",
 805                 .matches = {
 806                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 807                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 808                 },
 809         },
 810         {
 811                 .callback = intel_no_lvds_dmi_callback,
 812                 .ident = "Gigabyte GA-D525TUD",
 813                 .matches = {
 814                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 815                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 816                 },
 817         },
 818         {
 819                 .callback = intel_no_lvds_dmi_callback,
 820                 .ident = "Supermicro X7SPA-H",
 821                 .matches = {
 822                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 823                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 824                 },
 825         },
 826         {
 827                 .callback = intel_no_lvds_dmi_callback,
 828                 .ident = "Fujitsu Esprimo Q900",
 829                 .matches = {
 830                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 831                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 832                 },
 833         },
 834         {
 835                 .callback = intel_no_lvds_dmi_callback,
 836                 .ident = "Intel D410PT",
 837                 .matches = {
 838                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 839                         DMI_MATCH(DMI_BOARD_NAME, "D410PT"),
 840                 },
 841         },
 842         {
 843                 .callback = intel_no_lvds_dmi_callback,
 844                 .ident = "Intel D425KT",
 845                 .matches = {
 846                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 847                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D425KT"),
 848                 },
 849         },
 850         {
 851                 .callback = intel_no_lvds_dmi_callback,
 852                 .ident = "Intel D510MO",
 853                 .matches = {
 854                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 855                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 856                 },
 857         },
 858         {
 859                 .callback = intel_no_lvds_dmi_callback,
 860                 .ident = "Intel D525MW",
 861                 .matches = {
 862                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 863                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 864                 },
 865         },
 866
 867         { }     /* terminating entry */
 868 };
 869
 870 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 871 {
 872         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 873         return 1;
 874 }
 875
 876 static const struct dmi_system_id intel_dual_link_lvds[] = {
 877         {
 878                 .callback = intel_dual_link_lvds_callback,
 879                 .ident = "Apple MacBook Pro 15\" (2010)",
 880                 .matches = {
 881                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 882                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro6,2"),
 883                 },
 884         },
 885         {
 886                 .callback = intel_dual_link_lvds_callback,
 887                 .ident = "Apple MacBook Pro 15\" (2011)",
 888                 .matches = {
 889                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 890                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 891                 },
 892         },
 893         {
 894                 .callback = intel_dual_link_lvds_callback,
 895                 .ident = "Apple MacBook Pro 15\" (2012)",
 896                 .matches = {
 897                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 898                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,1"),
 899                 },
 900         },
 901         { }     /* terminating entry */
 902 };
 903
 904 struct intel_encoder *intel_get_lvds_encoder(struct drm_device *dev)
 905 {
 906         struct intel_encoder *intel_encoder;
 907
 908         for_each_intel_encoder(dev, intel_encoder)
 909                 if (intel_encoder->type == INTEL_OUTPUT_LVDS)
 910                         return intel_encoder;
 911
 912         return NULL;
 913 }
 914
 915 bool intel_is_dual_link_lvds(struct drm_device *dev)
 916 {
 917         struct intel_encoder *encoder = intel_get_lvds_encoder(dev);
 918
 919         return encoder && to_lvds_encoder(&encoder->base)->is_dual_link;
 920 }
 921
 922 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 923 {
 924         struct drm_device *dev = lvds_encoder->base.base.dev;
 925         unsigned int val;
 926         struct drm_i915_private *dev_priv = to_i915(dev);
 927
 928         /* use the module option value if specified */
 929         if (i915.lvds_channel_mode > 0)
 930                 return i915.lvds_channel_mode == 2;
 931
 932         /* single channel LVDS is limited to 112 MHz */
 933         if (lvds_encoder->attached_connector->base.panel.fixed_mode->clock
 934             > 112999)
 935                 return true;
 936
 937         if (dmi_check_system(intel_dual_link_lvds))
 938                 return true;
 939
 940         /* BIOS should set the proper LVDS register value at boot, but
 941          * in reality, it doesn't set the value when the lid is closed;
 942          * we need to check "the value to be set" in VBT when LVDS
 943          * register is uninitialized.
 944          */
 945         val = I915_READ(lvds_encoder->reg);
 946         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 947                 val = dev_priv->vbt.bios_lvds_val;
 948
 949         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 950 }
 951
 952 static bool intel_lvds_supported(struct drm_device *dev)
 953 {
 954         /* With the introduction of the PCH we gained a dedicated
 955          * LVDS presence pin, use it. */
 956         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 957                 return true;
 958
 959         /* Otherwise LVDS was only attached to mobile products,
 960          * except for the inglorious 830gm */
 961         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 962                 return true;
 963
 964         return false;
 965 }
 966
 967 /**
 968  * intel_lvds_init - setup LVDS connectors on this device
 969  * @dev: drm device
 970  *
 971  * Create the connector, register the LVDS DDC bus, and try to figure out what
 972  * modes we can display on the LVDS panel (if present).
 973  */
 974 void intel_lvds_init(struct drm_device *dev)
 975 {
 976         struct drm_i915_private *dev_priv = to_i915(dev);
 977         struct intel_lvds_encoder *lvds_encoder;
 978         struct intel_encoder *intel_encoder;
 979         struct intel_lvds_connector *lvds_connector;
 980         struct intel_connector *intel_connector;
 981         struct drm_connector *connector;
 982         struct drm_encoder *encoder;
 983         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 984         struct drm_display_mode *fixed_mode = NULL;
 985         struct drm_display_mode *downclock_mode = NULL;
 986         struct edid *edid;
 987         struct drm_crtc *crtc;
 988         i915_reg_t lvds_reg;
 989         u32 lvds;
 990         int pipe;
 991         u8 pin;
 992
 993         if (!intel_lvds_supported(dev))
 994                 return;
 995
 996         /* Skip init on machines we know falsely report LVDS */
 997         if (dmi_check_system(intel_no_lvds))
 998                 return;
 999
1000         if (HAS_PCH_SPLIT(dev))
1001                 lvds_reg = PCH_LVDS;
1002         else
1003                 lvds_reg = LVDS;
1004
1005         lvds = I915_READ(lvds_reg);
1006
1007         if (HAS_PCH_SPLIT(dev)) {
1008                 if ((lvds & LVDS_DETECTED) == 0)
1009                         return;
1010                 if (dev_priv->vbt.edp.support) {
1011                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
1012                         return;
1013                 }
1014         }
1015
1016         pin = GMBUS_PIN_PANEL;
1017         if (!intel_bios_is_lvds_present(dev_priv, &pin)) {
1018                 if ((lvds & LVDS_PORT_EN) == 0) {
1019                         DRM_DEBUG_KMS("LVDS is not present in VBT\n");
1020                         return;
1021                 }
1022                 DRM_DEBUG_KMS("LVDS is not present in VBT, but enabled anyway\n");
1023         }
1024
1025         lvds_encoder = kzalloc(sizeof(*lvds_encoder), GFP_KERNEL);
1026         if (!lvds_encoder)
1027                 return;
1028
1029         lvds_connector = kzalloc(sizeof(*lvds_connector), GFP_KERNEL);
1030         if (!lvds_connector) {
1031                 kfree(lvds_encoder);
1032                 return;
1033         }
1034
1035         if (intel_connector_init(&lvds_connector->base) < 0) {
1036                 kfree(lvds_connector);
1037                 kfree(lvds_encoder);
1038                 return;
1039         }
1040
1041         lvds_encoder->attached_connector = lvds_connector;
1042
1043         intel_encoder = &lvds_encoder->base;
1044         encoder = &intel_encoder->base;
1045         intel_connector = &lvds_connector->base;
1046         connector = &intel_connector->base;
1047         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
1048                            DRM_MODE_CONNECTOR_LVDS);
1049
1050         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
1051                          DRM_MODE_ENCODER_LVDS, "LVDS");
1052
1053         intel_encoder->enable = intel_enable_lvds;
1054         intel_encoder->pre_enable = intel_pre_enable_lvds;
1055         intel_encoder->compute_config = intel_lvds_compute_config;
1056         if (HAS_PCH_SPLIT(dev_priv)) {
1057                 intel_encoder->disable = pch_disable_lvds;
1058                 intel_encoder->post_disable = pch_post_disable_lvds;
1059         } else {
1060                 intel_encoder->disable = gmch_disable_lvds;
1061         }
1062         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
1063         intel_encoder->get_config = intel_lvds_get_config;
1064         intel_connector->get_hw_state = intel_connector_get_hw_state;
1065
1066         intel_connector_attach_encoder(intel_connector, intel_encoder);
1067         intel_encoder->type = INTEL_OUTPUT_LVDS;
1068
1069         intel_encoder->cloneable = 0;
1070         if (HAS_PCH_SPLIT(dev))
1071                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
1072         else if (IS_GEN4(dev))
1073                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
1074         else
1075                 intel_encoder->crtc_mask = (1 << 1);
1076
1077         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
1078         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1079         connector->interlace_allowed = false;
1080         connector->doublescan_allowed = false;
1081
1082         lvds_encoder->reg = lvds_reg;
1083
1084         /* create the scaling mode property */
1085         drm_mode_create_scaling_mode_property(dev);
1086         drm_object_attach_property(&connector->base,
1087                                       dev->mode_config.scaling_mode_property,
1088                                       DRM_MODE_SCALE_ASPECT);
1089         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1090
1091         intel_lvds_pps_get_hw_state(dev_priv, &lvds_encoder->init_pps);
1092         lvds_encoder->init_lvds_val = lvds;
1093
1094         /*
1095          * LVDS discovery:
1096          * 1) check for EDID on DDC
1097          * 2) check for VBT data
1098          * 3) check to see if LVDS is already on
1099          *    if none of the above, no panel
1100          * 4) make sure lid is open
1101          *    if closed, act like it's not there for now
1102          */
1103
1104         /*
1105          * Attempt to get the fixed panel mode from DDC.  Assume that the
1106          * preferred mode is the right one.
1107          */
1108         mutex_lock(&dev->mode_config.mutex);
1109         if (vga_switcheroo_handler_flags() & VGA_SWITCHEROO_CAN_SWITCH_DDC)
1110                 edid = drm_get_edid_switcheroo(connector,
1111                                     intel_gmbus_get_adapter(dev_priv, pin));
1112         else
1113                 edid = drm_get_edid(connector,
1114                                     intel_gmbus_get_adapter(dev_priv, pin));
1115         if (edid) {
1116                 if (drm_add_edid_modes(connector, edid)) {
1117                         drm_mode_connector_update_edid_property(connector,
1118                                                                 edid);
1119                 } else {
1120                         kfree(edid);
1121                         edid = ERR_PTR(-EINVAL);
1122                 }
1123         } else {
1124                 edid = ERR_PTR(-ENOENT);
1125         }
1126         lvds_connector->base.edid = edid;
1127
1128         list_for_each_entry(scan, &connector->probed_modes, head) {
1129                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1130                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1131                         drm_mode_debug_printmodeline(scan);
1132
1133                         fixed_mode = drm_mode_duplicate(dev, scan);
1134                         if (fixed_mode)
1135                                 goto out;
1136                 }
1137         }
1138
1139         /* Failed to get EDID, what about VBT? */
1140         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1141                 DRM_DEBUG_KMS("using mode from VBT: ");
1142                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1143
1144                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1145                 if (fixed_mode) {
1146                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1147                         connector->display_info.width_mm = fixed_mode->width_mm;
1148                         connector->display_info.height_mm = fixed_mode->height_mm;
1149                         goto out;
1150                 }
1151         }
1152
1153         /*
1154          * If we didn't get EDID, try checking if the panel is already turned
1155          * on.  If so, assume that whatever is currently programmed is the
1156          * correct mode.
1157          */
1158
1159         /* Ironlake: FIXME if still fail, not try pipe mode now */
1160         if (HAS_PCH_SPLIT(dev))
1161                 goto failed;
1162
1163         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1164         crtc = intel_get_crtc_for_pipe(dev, pipe);
1165
1166         if (crtc && (lvds & LVDS_PORT_EN)) {
1167                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1168                 if (fixed_mode) {
1169                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1170                         drm_mode_debug_printmodeline(fixed_mode);
1171                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1172                         goto out;
1173                 }
1174         }
1175
1176         /* If we still don't have a mode after all that, give up. */
1177         if (!fixed_mode)
1178                 goto failed;
1179
1180 out:
1181         mutex_unlock(&dev->mode_config.mutex);
1182
1183         intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
1184         intel_panel_setup_backlight(connector, INVALID_PIPE);
1185
1186         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1187         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1188                       lvds_encoder->is_dual_link ? "dual" : "single");
1189
1190         lvds_encoder->a3_power = lvds & LVDS_A3_POWER_MASK;
1191
1192         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1193         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1194                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1195                 lvds_connector->lid_notifier.notifier_call = NULL;
1196         }
1197
1198         return;
1199
1200 failed:
1201         mutex_unlock(&dev->mode_config.mutex);
1202
1203         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1204         drm_connector_cleanup(connector);
1205         drm_encoder_cleanup(encoder);
1206         kfree(lvds_encoder);
1207         kfree(lvds_connector);
1208         return;
1209 }