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         u32 pfit_control;
  53         u32 pfit_pgm_ratios;
  54         bool pfit_dirty;
  55         bool is_dual_link;
  56         u32 reg;
  57
  58         struct intel_lvds_connector *attached_connector;
  59 };
  60
  61 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  62 {
  63         return container_of(encoder, struct intel_lvds_encoder, base.base);
  64 }
  65
  66 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  67 {
  68         return container_of(connector, struct intel_lvds_connector, base.base);
  69 }
  70
  71 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  72                                     enum pipe *pipe)
  73 {
  74         struct drm_device *dev = encoder->base.dev;
  75         struct drm_i915_private *dev_priv = dev->dev_private;
  76         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  77         u32 tmp;
  78
  79         tmp = I915_READ(lvds_encoder->reg);
  80
  81         if (!(tmp & LVDS_PORT_EN))
  82                 return false;
  83
  84         if (HAS_PCH_CPT(dev))
  85                 *pipe = PORT_TO_PIPE_CPT(tmp);
  86         else
  87                 *pipe = PORT_TO_PIPE(tmp);
  88
  89         return true;
  90 }
  91
  92 /**
  93  * Sets the power state for the panel.
  94  */
  95 static void intel_enable_lvds(struct intel_encoder *encoder)
  96 {
  97         struct drm_device *dev = encoder->base.dev;
  98         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  99         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 100         struct drm_i915_private *dev_priv = dev->dev_private;
 101         u32 ctl_reg, stat_reg;
 102
 103         if (HAS_PCH_SPLIT(dev)) {
 104                 ctl_reg = PCH_PP_CONTROL;
 105                 stat_reg = PCH_PP_STATUS;
 106         } else {
 107                 ctl_reg = PP_CONTROL;
 108                 stat_reg = PP_STATUS;
 109         }
 110
 111         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 112
 113         if (lvds_encoder->pfit_dirty) {
 114                 /*
 115                  * Enable automatic panel scaling so that non-native modes
 116                  * fill the screen.  The panel fitter should only be
 117                  * adjusted whilst the pipe is disabled, according to
 118                  * register description and PRM.
 119                  */
 120                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
 121                               lvds_encoder->pfit_control,
 122                               lvds_encoder->pfit_pgm_ratios);
 123
 124                 I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
 125                 I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
 126                 lvds_encoder->pfit_dirty = false;
 127         }
 128
 129         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 130         POSTING_READ(lvds_encoder->reg);
 131         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 132                 DRM_ERROR("timed out waiting for panel to power on\n");
 133
 134         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 135 }
 136
 137 static void intel_disable_lvds(struct intel_encoder *encoder)
 138 {
 139         struct drm_device *dev = encoder->base.dev;
 140         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 141         struct drm_i915_private *dev_priv = dev->dev_private;
 142         u32 ctl_reg, stat_reg;
 143
 144         if (HAS_PCH_SPLIT(dev)) {
 145                 ctl_reg = PCH_PP_CONTROL;
 146                 stat_reg = PCH_PP_STATUS;
 147         } else {
 148                 ctl_reg = PP_CONTROL;
 149                 stat_reg = PP_STATUS;
 150         }
 151
 152         intel_panel_disable_backlight(dev);
 153
 154         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 155         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 156                 DRM_ERROR("timed out waiting for panel to power off\n");
 157
 158         if (lvds_encoder->pfit_control) {
 159                 I915_WRITE(PFIT_CONTROL, 0);
 160                 lvds_encoder->pfit_dirty = true;
 161         }
 162
 163         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 164         POSTING_READ(lvds_encoder->reg);
 165 }
 166
 167 static int intel_lvds_mode_valid(struct drm_connector *connector,
 168                                  struct drm_display_mode *mode)
 169 {
 170         struct intel_connector *intel_connector = to_intel_connector(connector);
 171         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 172
 173         if (mode->hdisplay > fixed_mode->hdisplay)
 174                 return MODE_PANEL;
 175         if (mode->vdisplay > fixed_mode->vdisplay)
 176                 return MODE_PANEL;
 177
 178         return MODE_OK;
 179 }
 180
 181 static void
 182 centre_horizontally(struct drm_display_mode *mode,
 183                     int width)
 184 {
 185         u32 border, sync_pos, blank_width, sync_width;
 186
 187         /* keep the hsync and hblank widths constant */
 188         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 189         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 190         sync_pos = (blank_width - sync_width + 1) / 2;
 191
 192         border = (mode->hdisplay - width + 1) / 2;
 193         border += border & 1; /* make the border even */
 194
 195         mode->crtc_hdisplay = width;
 196         mode->crtc_hblank_start = width + border;
 197         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 198
 199         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 200         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 201
 202         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 203 }
 204
 205 static void
 206 centre_vertically(struct drm_display_mode *mode,
 207                   int height)
 208 {
 209         u32 border, sync_pos, blank_width, sync_width;
 210
 211         /* keep the vsync and vblank widths constant */
 212         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 213         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 214         sync_pos = (blank_width - sync_width + 1) / 2;
 215
 216         border = (mode->vdisplay - height + 1) / 2;
 217
 218         mode->crtc_vdisplay = height;
 219         mode->crtc_vblank_start = height + border;
 220         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 221
 222         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 223         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 224
 225         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 226 }
 227
 228 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 229 {
 230         /*
 231          * Floating point operation is not supported. So the FACTOR
 232          * is defined, which can avoid the floating point computation
 233          * when calculating the panel ratio.
 234          */
 235 #define ACCURACY 12
 236 #define FACTOR (1 << ACCURACY)
 237         u32 ratio = source * FACTOR / target;
 238         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 239 }
 240
 241 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 242                                   const struct drm_display_mode *mode,
 243                                   struct drm_display_mode *adjusted_mode)
 244 {
 245         struct drm_device *dev = encoder->dev;
 246         struct drm_i915_private *dev_priv = dev->dev_private;
 247         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(encoder);
 248         struct intel_connector *intel_connector =
 249                 &lvds_encoder->attached_connector->base;
 250         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 251         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 252         int pipe;
 253
 254         /* Should never happen!! */
 255         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 256                 DRM_ERROR("Can't support LVDS on pipe A\n");
 257                 return false;
 258         }
 259
 260         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
 261                 return false;
 262
 263         /*
 264          * We have timings from the BIOS for the panel, put them in
 265          * to the adjusted mode.  The CRTC will be set up for this mode,
 266          * with the panel scaling set up to source from the H/VDisplay
 267          * of the original mode.
 268          */
 269         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 270                                adjusted_mode);
 271
 272         if (HAS_PCH_SPLIT(dev)) {
 273                 intel_pch_panel_fitting(dev,
 274                                         intel_connector->panel.fitting_mode,
 275                                         mode, adjusted_mode);
 276                 return true;
 277         }
 278
 279         /* Native modes don't need fitting */
 280         if (adjusted_mode->hdisplay == mode->hdisplay &&
 281             adjusted_mode->vdisplay == mode->vdisplay)
 282                 goto out;
 283
 284         /* 965+ wants fuzzy fitting */
 285         if (INTEL_INFO(dev)->gen >= 4)
 286                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 287                                  PFIT_FILTER_FUZZY);
 288
 289         /*
 290          * Enable automatic panel scaling for non-native modes so that they fill
 291          * the screen.  Should be enabled before the pipe is enabled, according
 292          * to register description and PRM.
 293          * Change the value here to see the borders for debugging
 294          */
 295         for_each_pipe(pipe)
 296                 I915_WRITE(BCLRPAT(pipe), 0);
 297
 298         drm_mode_set_crtcinfo(adjusted_mode, 0);
 299
 300         switch (intel_connector->panel.fitting_mode) {
 301         case DRM_MODE_SCALE_CENTER:
 302                 /*
 303                  * For centered modes, we have to calculate border widths &
 304                  * heights and modify the values programmed into the CRTC.
 305                  */
 306                 centre_horizontally(adjusted_mode, mode->hdisplay);
 307                 centre_vertically(adjusted_mode, mode->vdisplay);
 308                 border = LVDS_BORDER_ENABLE;
 309                 break;
 310
 311         case DRM_MODE_SCALE_ASPECT:
 312                 /* Scale but preserve the aspect ratio */
 313                 if (INTEL_INFO(dev)->gen >= 4) {
 314                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 315                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 316
 317                         /* 965+ is easy, it does everything in hw */
 318                         if (scaled_width > scaled_height)
 319                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 320                         else if (scaled_width < scaled_height)
 321                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 322                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 323                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 324                 } else {
 325                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 326                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 327                         /*
 328                          * For earlier chips we have to calculate the scaling
 329                          * ratio by hand and program it into the
 330                          * PFIT_PGM_RATIO register
 331                          */
 332                         if (scaled_width > scaled_height) { /* pillar */
 333                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 334
 335                                 border = LVDS_BORDER_ENABLE;
 336                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 337                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 338                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 339                                                             bits << PFIT_VERT_SCALE_SHIFT);
 340                                         pfit_control |= (PFIT_ENABLE |
 341                                                          VERT_INTERP_BILINEAR |
 342                                                          HORIZ_INTERP_BILINEAR);
 343                                 }
 344                         } else if (scaled_width < scaled_height) { /* letter */
 345                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 346
 347                                 border = LVDS_BORDER_ENABLE;
 348                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 349                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 350                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 351                                                             bits << PFIT_VERT_SCALE_SHIFT);
 352                                         pfit_control |= (PFIT_ENABLE |
 353                                                          VERT_INTERP_BILINEAR |
 354                                                          HORIZ_INTERP_BILINEAR);
 355                                 }
 356                         } else
 357                                 /* Aspects match, Let hw scale both directions */
 358                                 pfit_control |= (PFIT_ENABLE |
 359                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 360                                                  VERT_INTERP_BILINEAR |
 361                                                  HORIZ_INTERP_BILINEAR);
 362                 }
 363                 break;
 364
 365         case DRM_MODE_SCALE_FULLSCREEN:
 366                 /*
 367                  * Full scaling, even if it changes the aspect ratio.
 368                  * Fortunately this is all done for us in hw.
 369                  */
 370                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 371                     mode->hdisplay != adjusted_mode->hdisplay) {
 372                         pfit_control |= PFIT_ENABLE;
 373                         if (INTEL_INFO(dev)->gen >= 4)
 374                                 pfit_control |= PFIT_SCALING_AUTO;
 375                         else
 376                                 pfit_control |= (VERT_AUTO_SCALE |
 377                                                  VERT_INTERP_BILINEAR |
 378                                                  HORIZ_AUTO_SCALE |
 379                                                  HORIZ_INTERP_BILINEAR);
 380                 }
 381                 break;
 382
 383         default:
 384                 break;
 385         }
 386
 387 out:
 388         /* If not enabling scaling, be consistent and always use 0. */
 389         if ((pfit_control & PFIT_ENABLE) == 0) {
 390                 pfit_control = 0;
 391                 pfit_pgm_ratios = 0;
 392         }
 393
 394         /* Make sure pre-965 set dither correctly */
 395         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 396                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 397
 398         if (pfit_control != lvds_encoder->pfit_control ||
 399             pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
 400                 lvds_encoder->pfit_control = pfit_control;
 401                 lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
 402                 lvds_encoder->pfit_dirty = true;
 403         }
 404         dev_priv->lvds_border_bits = border;
 405
 406         /*
 407          * XXX: It would be nice to support lower refresh rates on the
 408          * panels to reduce power consumption, and perhaps match the
 409          * user's requested refresh rate.
 410          */
 411
 412         return true;
 413 }
 414
 415 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 416                                 struct drm_display_mode *mode,
 417                                 struct drm_display_mode *adjusted_mode)
 418 {
 419         /*
 420          * The LVDS pin pair will already have been turned on in the
 421          * intel_crtc_mode_set since it has a large impact on the DPLL
 422          * settings.
 423          */
 424 }
 425
 426 /**
 427  * Detect the LVDS connection.
 428  *
 429  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 430  * connected and closed means disconnected.  We also send hotplug events as
 431  * needed, using lid status notification from the input layer.
 432  */
 433 static enum drm_connector_status
 434 intel_lvds_detect(struct drm_connector *connector, bool force)
 435 {
 436         struct drm_device *dev = connector->dev;
 437         enum drm_connector_status status;
 438
 439         status = intel_panel_detect(dev);
 440         if (status != connector_status_unknown)
 441                 return status;
 442
 443         return connector_status_connected;
 444 }
 445
 446 /**
 447  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 448  */
 449 static int intel_lvds_get_modes(struct drm_connector *connector)
 450 {
 451         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 452         struct drm_device *dev = connector->dev;
 453         struct drm_display_mode *mode;
 454
 455         /* use cached edid if we have one */
 456         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 457                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 458
 459         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 460         if (mode == NULL)
 461                 return 0;
 462
 463         drm_mode_probed_add(connector, mode);
 464         return 1;
 465 }
 466
 467 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 468 {
 469         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 470         return 1;
 471 }
 472
 473 /* The GPU hangs up on these systems if modeset is performed on LID open */
 474 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 475         {
 476                 .callback = intel_no_modeset_on_lid_dmi_callback,
 477                 .ident = "Toshiba Tecra A11",
 478                 .matches = {
 479                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 480                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 481                 },
 482         },
 483
 484         { }     /* terminating entry */
 485 };
 486
 487 /*
 488  * Lid events. Note the use of 'modeset_on_lid':
 489  *  - we set it on lid close, and reset it on open
 490  *  - we use it as a "only once" bit (ie we ignore
 491  *    duplicate events where it was already properly
 492  *    set/reset)
 493  *  - the suspend/resume paths will also set it to
 494  *    zero, since they restore the mode ("lid open").
 495  */
 496 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 497                             void *unused)
 498 {
 499         struct intel_lvds_connector *lvds_connector =
 500                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 501         struct drm_connector *connector = &lvds_connector->base.base;
 502         struct drm_device *dev = connector->dev;
 503         struct drm_i915_private *dev_priv = dev->dev_private;
 504
 505         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 506                 return NOTIFY_OK;
 507
 508         /*
 509          * check and update the status of LVDS connector after receiving
 510          * the LID nofication event.
 511          */
 512         connector->status = connector->funcs->detect(connector, false);
 513
 514         /* Don't force modeset on machines where it causes a GPU lockup */
 515         if (dmi_check_system(intel_no_modeset_on_lid))
 516                 return NOTIFY_OK;
 517         if (!acpi_lid_open()) {
 518                 dev_priv->modeset_on_lid = 1;
 519                 return NOTIFY_OK;
 520         }
 521
 522         if (!dev_priv->modeset_on_lid)
 523                 return NOTIFY_OK;
 524
 525         dev_priv->modeset_on_lid = 0;
 526
 527         mutex_lock(&dev->mode_config.mutex);
 528         intel_modeset_setup_hw_state(dev, true);
 529         mutex_unlock(&dev->mode_config.mutex);
 530
 531         return NOTIFY_OK;
 532 }
 533
 534 /**
 535  * intel_lvds_destroy - unregister and free LVDS structures
 536  * @connector: connector to free
 537  *
 538  * Unregister the DDC bus for this connector then free the driver private
 539  * structure.
 540  */
 541 static void intel_lvds_destroy(struct drm_connector *connector)
 542 {
 543         struct intel_lvds_connector *lvds_connector =
 544                 to_lvds_connector(connector);
 545
 546         if (lvds_connector->lid_notifier.notifier_call)
 547                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 548
 549         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 550                 kfree(lvds_connector->base.edid);
 551
 552         intel_panel_destroy_backlight(connector->dev);
 553         intel_panel_fini(&lvds_connector->base.panel);
 554
 555         drm_sysfs_connector_remove(connector);
 556         drm_connector_cleanup(connector);
 557         kfree(connector);
 558 }
 559
 560 static int intel_lvds_set_property(struct drm_connector *connector,
 561                                    struct drm_property *property,
 562                                    uint64_t value)
 563 {
 564         struct intel_connector *intel_connector = to_intel_connector(connector);
 565         struct drm_device *dev = connector->dev;
 566
 567         if (property == dev->mode_config.scaling_mode_property) {
 568                 struct drm_crtc *crtc;
 569
 570                 if (value == DRM_MODE_SCALE_NONE) {
 571                         DRM_DEBUG_KMS("no scaling not supported\n");
 572                         return -EINVAL;
 573                 }
 574
 575                 if (intel_connector->panel.fitting_mode == value) {
 576                         /* the LVDS scaling property is not changed */
 577                         return 0;
 578                 }
 579                 intel_connector->panel.fitting_mode = value;
 580
 581                 crtc = intel_attached_encoder(connector)->base.crtc;
 582                 if (crtc && crtc->enabled) {
 583                         /*
 584                          * If the CRTC is enabled, the display will be changed
 585                          * according to the new panel fitting mode.
 586                          */
 587                         intel_set_mode(crtc, &crtc->mode,
 588                                        crtc->x, crtc->y, crtc->fb);
 589                 }
 590         }
 591
 592         return 0;
 593 }
 594
 595 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 596         .mode_fixup = intel_lvds_mode_fixup,
 597         .mode_set = intel_lvds_mode_set,
 598         .disable = intel_encoder_noop,
 599 };
 600
 601 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 602         .get_modes = intel_lvds_get_modes,
 603         .mode_valid = intel_lvds_mode_valid,
 604         .best_encoder = intel_best_encoder,
 605 };
 606
 607 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 608         .dpms = intel_connector_dpms,
 609         .detect = intel_lvds_detect,
 610         .fill_modes = drm_helper_probe_single_connector_modes,
 611         .set_property = intel_lvds_set_property,
 612         .destroy = intel_lvds_destroy,
 613 };
 614
 615 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 616         .destroy = intel_encoder_destroy,
 617 };
 618
 619 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 620 {
 621         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 622         return 1;
 623 }
 624
 625 /* These systems claim to have LVDS, but really don't */
 626 static const struct dmi_system_id intel_no_lvds[] = {
 627         {
 628                 .callback = intel_no_lvds_dmi_callback,
 629                 .ident = "Apple Mac Mini (Core series)",
 630                 .matches = {
 631                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 632                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 633                 },
 634         },
 635         {
 636                 .callback = intel_no_lvds_dmi_callback,
 637                 .ident = "Apple Mac Mini (Core 2 series)",
 638                 .matches = {
 639                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 640                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 641                 },
 642         },
 643         {
 644                 .callback = intel_no_lvds_dmi_callback,
 645                 .ident = "MSI IM-945GSE-A",
 646                 .matches = {
 647                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 648                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 649                 },
 650         },
 651         {
 652                 .callback = intel_no_lvds_dmi_callback,
 653                 .ident = "Dell Studio Hybrid",
 654                 .matches = {
 655                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 656                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 657                 },
 658         },
 659         {
 660                 .callback = intel_no_lvds_dmi_callback,
 661                 .ident = "Dell OptiPlex FX170",
 662                 .matches = {
 663                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 664                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 665                 },
 666         },
 667         {
 668                 .callback = intel_no_lvds_dmi_callback,
 669                 .ident = "AOpen Mini PC",
 670                 .matches = {
 671                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 672                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 673                 },
 674         },
 675         {
 676                 .callback = intel_no_lvds_dmi_callback,
 677                 .ident = "AOpen Mini PC MP915",
 678                 .matches = {
 679                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 680                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 681                 },
 682         },
 683         {
 684                 .callback = intel_no_lvds_dmi_callback,
 685                 .ident = "AOpen i915GMm-HFS",
 686                 .matches = {
 687                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 688                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 689                 },
 690         },
 691         {
 692                 .callback = intel_no_lvds_dmi_callback,
 693                 .ident = "AOpen i45GMx-I",
 694                 .matches = {
 695                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 696                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 697                 },
 698         },
 699         {
 700                 .callback = intel_no_lvds_dmi_callback,
 701                 .ident = "Aopen i945GTt-VFA",
 702                 .matches = {
 703                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 704                 },
 705         },
 706         {
 707                 .callback = intel_no_lvds_dmi_callback,
 708                 .ident = "Clientron U800",
 709                 .matches = {
 710                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 711                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 712                 },
 713         },
 714         {
 715                 .callback = intel_no_lvds_dmi_callback,
 716                 .ident = "Clientron E830",
 717                 .matches = {
 718                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 719                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 720                 },
 721         },
 722         {
 723                 .callback = intel_no_lvds_dmi_callback,
 724                 .ident = "Asus EeeBox PC EB1007",
 725                 .matches = {
 726                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 727                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 728                 },
 729         },
 730         {
 731                 .callback = intel_no_lvds_dmi_callback,
 732                 .ident = "Asus AT5NM10T-I",
 733                 .matches = {
 734                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 735                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 736                 },
 737         },
 738         {
 739                 .callback = intel_no_lvds_dmi_callback,
 740                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 741                 .matches = {
 742                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 743                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 744                 },
 745         },
 746         {
 747                 .callback = intel_no_lvds_dmi_callback,
 748                 .ident = "Hewlett-Packard t5745",
 749                 .matches = {
 750                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 751                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 752                 },
 753         },
 754         {
 755                 .callback = intel_no_lvds_dmi_callback,
 756                 .ident = "Hewlett-Packard st5747",
 757                 .matches = {
 758                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 759                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 760                 },
 761         },
 762         {
 763                 .callback = intel_no_lvds_dmi_callback,
 764                 .ident = "MSI Wind Box DC500",
 765                 .matches = {
 766                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 767                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 768                 },
 769         },
 770         {
 771                 .callback = intel_no_lvds_dmi_callback,
 772                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
 773                 .matches = {
 774                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
 775                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
 776                 },
 777         },
 778         {
 779                 .callback = intel_no_lvds_dmi_callback,
 780                 .ident = "Gigabyte GA-D525TUD",
 781                 .matches = {
 782                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 783                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 784                 },
 785         },
 786         {
 787                 .callback = intel_no_lvds_dmi_callback,
 788                 .ident = "Supermicro X7SPA-H",
 789                 .matches = {
 790                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 791                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 792                 },
 793         },
 794
 795         { }     /* terminating entry */
 796 };
 797
 798 /**
 799  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 800  * @dev: drm device
 801  * @connector: LVDS connector
 802  *
 803  * Find the reduced downclock for LVDS in EDID.
 804  */
 805 static void intel_find_lvds_downclock(struct drm_device *dev,
 806                                       struct drm_display_mode *fixed_mode,
 807                                       struct drm_connector *connector)
 808 {
 809         struct drm_i915_private *dev_priv = dev->dev_private;
 810         struct drm_display_mode *scan;
 811         int temp_downclock;
 812
 813         temp_downclock = fixed_mode->clock;
 814         list_for_each_entry(scan, &connector->probed_modes, head) {
 815                 /*
 816                  * If one mode has the same resolution with the fixed_panel
 817                  * mode while they have the different refresh rate, it means
 818                  * that the reduced downclock is found for the LVDS. In such
 819                  * case we can set the different FPx0/1 to dynamically select
 820                  * between low and high frequency.
 821                  */
 822                 if (scan->hdisplay == fixed_mode->hdisplay &&
 823                     scan->hsync_start == fixed_mode->hsync_start &&
 824                     scan->hsync_end == fixed_mode->hsync_end &&
 825                     scan->htotal == fixed_mode->htotal &&
 826                     scan->vdisplay == fixed_mode->vdisplay &&
 827                     scan->vsync_start == fixed_mode->vsync_start &&
 828                     scan->vsync_end == fixed_mode->vsync_end &&
 829                     scan->vtotal == fixed_mode->vtotal) {
 830                         if (scan->clock < temp_downclock) {
 831                                 /*
 832                                  * The downclock is already found. But we
 833                                  * expect to find the lower downclock.
 834                                  */
 835                                 temp_downclock = scan->clock;
 836                         }
 837                 }
 838         }
 839         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 840                 /* We found the downclock for LVDS. */
 841                 dev_priv->lvds_downclock_avail = 1;
 842                 dev_priv->lvds_downclock = temp_downclock;
 843                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 844                               "Normal clock %dKhz, downclock %dKhz\n",
 845                               fixed_mode->clock, temp_downclock);
 846         }
 847 }
 848
 849 /*
 850  * Enumerate the child dev array parsed from VBT to check whether
 851  * the LVDS is present.
 852  * If it is present, return 1.
 853  * If it is not present, return false.
 854  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 855  */
 856 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 857                                    u8 *i2c_pin)
 858 {
 859         struct drm_i915_private *dev_priv = dev->dev_private;
 860         int i;
 861
 862         if (!dev_priv->child_dev_num)
 863                 return true;
 864
 865         for (i = 0; i < dev_priv->child_dev_num; i++) {
 866                 struct child_device_config *child = dev_priv->child_dev + i;
 867
 868                 /* If the device type is not LFP, continue.
 869                  * We have to check both the new identifiers as well as the
 870                  * old for compatibility with some BIOSes.
 871                  */
 872                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 873                     child->device_type != DEVICE_TYPE_LFP)
 874                         continue;
 875
 876                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 877                         *i2c_pin = child->i2c_pin;
 878
 879                 /* However, we cannot trust the BIOS writers to populate
 880                  * the VBT correctly.  Since LVDS requires additional
 881                  * information from AIM blocks, a non-zero addin offset is
 882                  * a good indicator that the LVDS is actually present.
 883                  */
 884                 if (child->addin_offset)
 885                         return true;
 886
 887                 /* But even then some BIOS writers perform some black magic
 888                  * and instantiate the device without reference to any
 889                  * additional data.  Trust that if the VBT was written into
 890                  * the OpRegion then they have validated the LVDS's existence.
 891                  */
 892                 if (dev_priv->opregion.vbt)
 893                         return true;
 894         }
 895
 896         return false;
 897 }
 898
 899 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 900 {
 901         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 902         return 1;
 903 }
 904
 905 static const struct dmi_system_id intel_dual_link_lvds[] = {
 906         {
 907                 .callback = intel_dual_link_lvds_callback,
 908                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 909                 .matches = {
 910                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 911                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 912                 },
 913         },
 914         { }     /* terminating entry */
 915 };
 916
 917 bool intel_is_dual_link_lvds(struct drm_device *dev)
 918 {
 919         struct intel_encoder *encoder;
 920         struct intel_lvds_encoder *lvds_encoder;
 921
 922         list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 923                             base.head) {
 924                 if (encoder->type == INTEL_OUTPUT_LVDS) {
 925                         lvds_encoder = to_lvds_encoder(&encoder->base);
 926
 927                         return lvds_encoder->is_dual_link;
 928                 }
 929         }
 930
 931         return false;
 932 }
 933
 934 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 935 {
 936         struct drm_device *dev = lvds_encoder->base.base.dev;
 937         unsigned int val;
 938         struct drm_i915_private *dev_priv = dev->dev_private;
 939
 940         /* use the module option value if specified */
 941         if (i915_lvds_channel_mode > 0)
 942                 return i915_lvds_channel_mode == 2;
 943
 944         if (dmi_check_system(intel_dual_link_lvds))
 945                 return true;
 946
 947         /* BIOS should set the proper LVDS register value at boot, but
 948          * in reality, it doesn't set the value when the lid is closed;
 949          * we need to check "the value to be set" in VBT when LVDS
 950          * register is uninitialized.
 951          */
 952         val = I915_READ(lvds_encoder->reg);
 953         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 954                 val = dev_priv->bios_lvds_val;
 955
 956         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 957 }
 958
 959 static bool intel_lvds_supported(struct drm_device *dev)
 960 {
 961         /* With the introduction of the PCH we gained a dedicated
 962          * LVDS presence pin, use it. */
 963         if (HAS_PCH_SPLIT(dev))
 964                 return true;
 965
 966         /* Otherwise LVDS was only attached to mobile products,
 967          * except for the inglorious 830gm */
 968         return IS_MOBILE(dev) && !IS_I830(dev);
 969 }
 970
 971 /**
 972  * intel_lvds_init - setup LVDS connectors on this device
 973  * @dev: drm device
 974  *
 975  * Create the connector, register the LVDS DDC bus, and try to figure out what
 976  * modes we can display on the LVDS panel (if present).
 977  */
 978 bool intel_lvds_init(struct drm_device *dev)
 979 {
 980         struct drm_i915_private *dev_priv = dev->dev_private;
 981         struct intel_lvds_encoder *lvds_encoder;
 982         struct intel_encoder *intel_encoder;
 983         struct intel_lvds_connector *lvds_connector;
 984         struct intel_connector *intel_connector;
 985         struct drm_connector *connector;
 986         struct drm_encoder *encoder;
 987         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 988         struct drm_display_mode *fixed_mode = NULL;
 989         struct edid *edid;
 990         struct drm_crtc *crtc;
 991         u32 lvds;
 992         int pipe;
 993         u8 pin;
 994
 995         if (!intel_lvds_supported(dev))
 996                 return false;
 997
 998         /* Skip init on machines we know falsely report LVDS */
 999         if (dmi_check_system(intel_no_lvds))
1000                 return false;
1001
1002         pin = GMBUS_PORT_PANEL;
1003         if (!lvds_is_present_in_vbt(dev, &pin)) {
1004                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
1005                 return false;
1006         }
1007
1008         if (HAS_PCH_SPLIT(dev)) {
1009                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
1010                         return false;
1011                 if (dev_priv->edp.support) {
1012                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
1013                         return false;
1014                 }
1015         }
1016
1017         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
1018         if (!lvds_encoder)
1019                 return false;
1020
1021         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
1022         if (!lvds_connector) {
1023                 kfree(lvds_encoder);
1024                 return false;
1025         }
1026
1027         lvds_encoder->attached_connector = lvds_connector;
1028
1029         if (!HAS_PCH_SPLIT(dev)) {
1030                 lvds_encoder->pfit_control = I915_READ(PFIT_CONTROL);
1031         }
1032
1033         intel_encoder = &lvds_encoder->base;
1034         encoder = &intel_encoder->base;
1035         intel_connector = &lvds_connector->base;
1036         connector = &intel_connector->base;
1037         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
1038                            DRM_MODE_CONNECTOR_LVDS);
1039
1040         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
1041                          DRM_MODE_ENCODER_LVDS);
1042
1043         intel_encoder->enable = intel_enable_lvds;
1044         intel_encoder->disable = intel_disable_lvds;
1045         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
1046         intel_connector->get_hw_state = intel_connector_get_hw_state;
1047
1048         intel_connector_attach_encoder(intel_connector, intel_encoder);
1049         intel_encoder->type = INTEL_OUTPUT_LVDS;
1050
1051         intel_encoder->cloneable = false;
1052         if (HAS_PCH_SPLIT(dev))
1053                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
1054         else if (IS_GEN4(dev))
1055                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
1056         else
1057                 intel_encoder->crtc_mask = (1 << 1);
1058
1059         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
1060         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
1061         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1062         connector->interlace_allowed = false;
1063         connector->doublescan_allowed = false;
1064
1065         if (HAS_PCH_SPLIT(dev)) {
1066                 lvds_encoder->reg = PCH_LVDS;
1067         } else {
1068                 lvds_encoder->reg = LVDS;
1069         }
1070
1071         /* create the scaling mode property */
1072         drm_mode_create_scaling_mode_property(dev);
1073         drm_object_attach_property(&connector->base,
1074                                       dev->mode_config.scaling_mode_property,
1075                                       DRM_MODE_SCALE_ASPECT);
1076         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1077         /*
1078          * LVDS discovery:
1079          * 1) check for EDID on DDC
1080          * 2) check for VBT data
1081          * 3) check to see if LVDS is already on
1082          *    if none of the above, no panel
1083          * 4) make sure lid is open
1084          *    if closed, act like it's not there for now
1085          */
1086
1087         /*
1088          * Attempt to get the fixed panel mode from DDC.  Assume that the
1089          * preferred mode is the right one.
1090          */
1091         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1092         if (edid) {
1093                 if (drm_add_edid_modes(connector, edid)) {
1094                         drm_mode_connector_update_edid_property(connector,
1095                                                                 edid);
1096                 } else {
1097                         kfree(edid);
1098                         edid = ERR_PTR(-EINVAL);
1099                 }
1100         } else {
1101                 edid = ERR_PTR(-ENOENT);
1102         }
1103         lvds_connector->base.edid = edid;
1104
1105         if (IS_ERR_OR_NULL(edid)) {
1106                 /* Didn't get an EDID, so
1107                  * Set wide sync ranges so we get all modes
1108                  * handed to valid_mode for checking
1109                  */
1110                 connector->display_info.min_vfreq = 0;
1111                 connector->display_info.max_vfreq = 200;
1112                 connector->display_info.min_hfreq = 0;
1113                 connector->display_info.max_hfreq = 200;
1114         }
1115
1116         list_for_each_entry(scan, &connector->probed_modes, head) {
1117                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1118                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1119                         drm_mode_debug_printmodeline(scan);
1120
1121                         fixed_mode = drm_mode_duplicate(dev, scan);
1122                         if (fixed_mode) {
1123                                 intel_find_lvds_downclock(dev, fixed_mode,
1124                                                           connector);
1125                                 goto out;
1126                         }
1127                 }
1128         }
1129
1130         /* Failed to get EDID, what about VBT? */
1131         if (dev_priv->lfp_lvds_vbt_mode) {
1132                 DRM_DEBUG_KMS("using mode from VBT: ");
1133                 drm_mode_debug_printmodeline(dev_priv->lfp_lvds_vbt_mode);
1134
1135                 fixed_mode = drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1136                 if (fixed_mode) {
1137                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1138                         goto out;
1139                 }
1140         }
1141
1142         /*
1143          * If we didn't get EDID, try checking if the panel is already turned
1144          * on.  If so, assume that whatever is currently programmed is the
1145          * correct mode.
1146          */
1147
1148         /* Ironlake: FIXME if still fail, not try pipe mode now */
1149         if (HAS_PCH_SPLIT(dev))
1150                 goto failed;
1151
1152         lvds = I915_READ(LVDS);
1153         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1154         crtc = intel_get_crtc_for_pipe(dev, pipe);
1155
1156         if (crtc && (lvds & LVDS_PORT_EN)) {
1157                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1158                 if (fixed_mode) {
1159                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1160                         drm_mode_debug_printmodeline(fixed_mode);
1161                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1162                         goto out;
1163                 }
1164         }
1165
1166         /* If we still don't have a mode after all that, give up. */
1167         if (!fixed_mode)
1168                 goto failed;
1169
1170 out:
1171         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1172         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1173                       lvds_encoder->is_dual_link ? "dual" : "single");
1174
1175         /*
1176          * Unlock registers and just
1177          * leave them unlocked
1178          */
1179         if (HAS_PCH_SPLIT(dev)) {
1180                 I915_WRITE(PCH_PP_CONTROL,
1181                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1182         } else {
1183                 I915_WRITE(PP_CONTROL,
1184                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1185         }
1186         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1187         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1188                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1189                 lvds_connector->lid_notifier.notifier_call = NULL;
1190         }
1191         drm_sysfs_connector_add(connector);
1192
1193         intel_panel_init(&intel_connector->panel, fixed_mode);
1194         intel_panel_setup_backlight(connector);
1195
1196         return true;
1197
1198 failed:
1199         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1200         drm_connector_cleanup(connector);
1201         drm_encoder_cleanup(encoder);
1202         if (fixed_mode)
1203                 drm_mode_destroy(dev, fixed_mode);
1204         kfree(lvds_encoder);
1205         kfree(lvds_connector);
1206         return false;
1207 }