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
  47 struct intel_lvds_encoder {
  48         struct intel_encoder base;
  49
  50         struct edid *edid;
  51
  52         int fitting_mode;
  53         u32 pfit_control;
  54         u32 pfit_pgm_ratios;
  55         bool pfit_dirty;
  56
  57         struct drm_display_mode *fixed_mode;
  58 };
  59
  60 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  61 {
  62         return container_of(encoder, struct intel_lvds_encoder, base.base);
  63 }
  64
  65 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  66 {
  67         return container_of(connector, struct intel_lvds_connector, base.base);
  68 }
  69
  70 static struct intel_lvds_encoder *intel_attached_lvds(struct drm_connector *connector)
  71 {
  72         return container_of(intel_attached_encoder(connector),
  73                             struct intel_lvds_encoder, base);
  74 }
  75
  76 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  77                                     enum pipe *pipe)
  78 {
  79         struct drm_device *dev = encoder->base.dev;
  80         struct drm_i915_private *dev_priv = dev->dev_private;
  81         u32 lvds_reg, tmp;
  82
  83         if (HAS_PCH_SPLIT(dev)) {
  84                 lvds_reg = PCH_LVDS;
  85         } else {
  86                 lvds_reg = LVDS;
  87         }
  88
  89         tmp = I915_READ(lvds_reg);
  90
  91         if (!(tmp & LVDS_PORT_EN))
  92                 return false;
  93
  94         if (HAS_PCH_CPT(dev))
  95                 *pipe = PORT_TO_PIPE_CPT(tmp);
  96         else
  97                 *pipe = PORT_TO_PIPE(tmp);
  98
  99         return true;
 100 }
 101
 102 /**
 103  * Sets the power state for the panel.
 104  */
 105 static void intel_enable_lvds(struct intel_encoder *encoder)
 106 {
 107         struct drm_device *dev = encoder->base.dev;
 108         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 109         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 110         struct drm_i915_private *dev_priv = dev->dev_private;
 111         u32 ctl_reg, lvds_reg, stat_reg;
 112
 113         if (HAS_PCH_SPLIT(dev)) {
 114                 ctl_reg = PCH_PP_CONTROL;
 115                 lvds_reg = PCH_LVDS;
 116                 stat_reg = PCH_PP_STATUS;
 117         } else {
 118                 ctl_reg = PP_CONTROL;
 119                 lvds_reg = LVDS;
 120                 stat_reg = PP_STATUS;
 121         }
 122
 123         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
 124
 125         if (lvds_encoder->pfit_dirty) {
 126                 /*
 127                  * Enable automatic panel scaling so that non-native modes
 128                  * fill the screen.  The panel fitter should only be
 129                  * adjusted whilst the pipe is disabled, according to
 130                  * register description and PRM.
 131                  */
 132                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
 133                               lvds_encoder->pfit_control,
 134                               lvds_encoder->pfit_pgm_ratios);
 135
 136                 I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
 137                 I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
 138                 lvds_encoder->pfit_dirty = false;
 139         }
 140
 141         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 142         POSTING_READ(lvds_reg);
 143         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 144                 DRM_ERROR("timed out waiting for panel to power on\n");
 145
 146         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 147 }
 148
 149 static void intel_disable_lvds(struct intel_encoder *encoder)
 150 {
 151         struct drm_device *dev = encoder->base.dev;
 152         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 153         struct drm_i915_private *dev_priv = dev->dev_private;
 154         u32 ctl_reg, lvds_reg, stat_reg;
 155
 156         if (HAS_PCH_SPLIT(dev)) {
 157                 ctl_reg = PCH_PP_CONTROL;
 158                 lvds_reg = PCH_LVDS;
 159                 stat_reg = PCH_PP_STATUS;
 160         } else {
 161                 ctl_reg = PP_CONTROL;
 162                 lvds_reg = LVDS;
 163                 stat_reg = PP_STATUS;
 164         }
 165
 166         intel_panel_disable_backlight(dev);
 167
 168         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 169         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 170                 DRM_ERROR("timed out waiting for panel to power off\n");
 171
 172         if (lvds_encoder->pfit_control) {
 173                 I915_WRITE(PFIT_CONTROL, 0);
 174                 lvds_encoder->pfit_dirty = true;
 175         }
 176
 177         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 178         POSTING_READ(lvds_reg);
 179 }
 180
 181 static int intel_lvds_mode_valid(struct drm_connector *connector,
 182                                  struct drm_display_mode *mode)
 183 {
 184         struct intel_lvds_encoder *lvds_encoder = intel_attached_lvds(connector);
 185         struct drm_display_mode *fixed_mode = lvds_encoder->fixed_mode;
 186
 187         if (mode->hdisplay > fixed_mode->hdisplay)
 188                 return MODE_PANEL;
 189         if (mode->vdisplay > fixed_mode->vdisplay)
 190                 return MODE_PANEL;
 191
 192         return MODE_OK;
 193 }
 194
 195 static void
 196 centre_horizontally(struct drm_display_mode *mode,
 197                     int width)
 198 {
 199         u32 border, sync_pos, blank_width, sync_width;
 200
 201         /* keep the hsync and hblank widths constant */
 202         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 203         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 204         sync_pos = (blank_width - sync_width + 1) / 2;
 205
 206         border = (mode->hdisplay - width + 1) / 2;
 207         border += border & 1; /* make the border even */
 208
 209         mode->crtc_hdisplay = width;
 210         mode->crtc_hblank_start = width + border;
 211         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 212
 213         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 214         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 215
 216         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 217 }
 218
 219 static void
 220 centre_vertically(struct drm_display_mode *mode,
 221                   int height)
 222 {
 223         u32 border, sync_pos, blank_width, sync_width;
 224
 225         /* keep the vsync and vblank widths constant */
 226         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 227         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 228         sync_pos = (blank_width - sync_width + 1) / 2;
 229
 230         border = (mode->vdisplay - height + 1) / 2;
 231
 232         mode->crtc_vdisplay = height;
 233         mode->crtc_vblank_start = height + border;
 234         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 235
 236         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 237         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 238
 239         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 240 }
 241
 242 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 243 {
 244         /*
 245          * Floating point operation is not supported. So the FACTOR
 246          * is defined, which can avoid the floating point computation
 247          * when calculating the panel ratio.
 248          */
 249 #define ACCURACY 12
 250 #define FACTOR (1 << ACCURACY)
 251         u32 ratio = source * FACTOR / target;
 252         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 253 }
 254
 255 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 256                                   const struct drm_display_mode *mode,
 257                                   struct drm_display_mode *adjusted_mode)
 258 {
 259         struct drm_device *dev = encoder->dev;
 260         struct drm_i915_private *dev_priv = dev->dev_private;
 261         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(encoder);
 262         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 263         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 264         int pipe;
 265
 266         /* Should never happen!! */
 267         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 268                 DRM_ERROR("Can't support LVDS on pipe A\n");
 269                 return false;
 270         }
 271
 272         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
 273                 return false;
 274
 275         /*
 276          * We have timings from the BIOS for the panel, put them in
 277          * to the adjusted mode.  The CRTC will be set up for this mode,
 278          * with the panel scaling set up to source from the H/VDisplay
 279          * of the original mode.
 280          */
 281         intel_fixed_panel_mode(lvds_encoder->fixed_mode, adjusted_mode);
 282
 283         if (HAS_PCH_SPLIT(dev)) {
 284                 intel_pch_panel_fitting(dev, lvds_encoder->fitting_mode,
 285                                         mode, adjusted_mode);
 286                 return true;
 287         }
 288
 289         /* Native modes don't need fitting */
 290         if (adjusted_mode->hdisplay == mode->hdisplay &&
 291             adjusted_mode->vdisplay == mode->vdisplay)
 292                 goto out;
 293
 294         /* 965+ wants fuzzy fitting */
 295         if (INTEL_INFO(dev)->gen >= 4)
 296                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 297                                  PFIT_FILTER_FUZZY);
 298
 299         /*
 300          * Enable automatic panel scaling for non-native modes so that they fill
 301          * the screen.  Should be enabled before the pipe is enabled, according
 302          * to register description and PRM.
 303          * Change the value here to see the borders for debugging
 304          */
 305         for_each_pipe(pipe)
 306                 I915_WRITE(BCLRPAT(pipe), 0);
 307
 308         drm_mode_set_crtcinfo(adjusted_mode, 0);
 309
 310         switch (lvds_encoder->fitting_mode) {
 311         case DRM_MODE_SCALE_CENTER:
 312                 /*
 313                  * For centered modes, we have to calculate border widths &
 314                  * heights and modify the values programmed into the CRTC.
 315                  */
 316                 centre_horizontally(adjusted_mode, mode->hdisplay);
 317                 centre_vertically(adjusted_mode, mode->vdisplay);
 318                 border = LVDS_BORDER_ENABLE;
 319                 break;
 320
 321         case DRM_MODE_SCALE_ASPECT:
 322                 /* Scale but preserve the aspect ratio */
 323                 if (INTEL_INFO(dev)->gen >= 4) {
 324                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 325                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 326
 327                         /* 965+ is easy, it does everything in hw */
 328                         if (scaled_width > scaled_height)
 329                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 330                         else if (scaled_width < scaled_height)
 331                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 332                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 333                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 334                 } else {
 335                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 336                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 337                         /*
 338                          * For earlier chips we have to calculate the scaling
 339                          * ratio by hand and program it into the
 340                          * PFIT_PGM_RATIO register
 341                          */
 342                         if (scaled_width > scaled_height) { /* pillar */
 343                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 344
 345                                 border = LVDS_BORDER_ENABLE;
 346                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 347                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 348                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 349                                                             bits << PFIT_VERT_SCALE_SHIFT);
 350                                         pfit_control |= (PFIT_ENABLE |
 351                                                          VERT_INTERP_BILINEAR |
 352                                                          HORIZ_INTERP_BILINEAR);
 353                                 }
 354                         } else if (scaled_width < scaled_height) { /* letter */
 355                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 356
 357                                 border = LVDS_BORDER_ENABLE;
 358                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 359                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 360                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 361                                                             bits << PFIT_VERT_SCALE_SHIFT);
 362                                         pfit_control |= (PFIT_ENABLE |
 363                                                          VERT_INTERP_BILINEAR |
 364                                                          HORIZ_INTERP_BILINEAR);
 365                                 }
 366                         } else
 367                                 /* Aspects match, Let hw scale both directions */
 368                                 pfit_control |= (PFIT_ENABLE |
 369                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 370                                                  VERT_INTERP_BILINEAR |
 371                                                  HORIZ_INTERP_BILINEAR);
 372                 }
 373                 break;
 374
 375         case DRM_MODE_SCALE_FULLSCREEN:
 376                 /*
 377                  * Full scaling, even if it changes the aspect ratio.
 378                  * Fortunately this is all done for us in hw.
 379                  */
 380                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 381                     mode->hdisplay != adjusted_mode->hdisplay) {
 382                         pfit_control |= PFIT_ENABLE;
 383                         if (INTEL_INFO(dev)->gen >= 4)
 384                                 pfit_control |= PFIT_SCALING_AUTO;
 385                         else
 386                                 pfit_control |= (VERT_AUTO_SCALE |
 387                                                  VERT_INTERP_BILINEAR |
 388                                                  HORIZ_AUTO_SCALE |
 389                                                  HORIZ_INTERP_BILINEAR);
 390                 }
 391                 break;
 392
 393         default:
 394                 break;
 395         }
 396
 397 out:
 398         /* If not enabling scaling, be consistent and always use 0. */
 399         if ((pfit_control & PFIT_ENABLE) == 0) {
 400                 pfit_control = 0;
 401                 pfit_pgm_ratios = 0;
 402         }
 403
 404         /* Make sure pre-965 set dither correctly */
 405         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 406                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 407
 408         if (pfit_control != lvds_encoder->pfit_control ||
 409             pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
 410                 lvds_encoder->pfit_control = pfit_control;
 411                 lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
 412                 lvds_encoder->pfit_dirty = true;
 413         }
 414         dev_priv->lvds_border_bits = border;
 415
 416         /*
 417          * XXX: It would be nice to support lower refresh rates on the
 418          * panels to reduce power consumption, and perhaps match the
 419          * user's requested refresh rate.
 420          */
 421
 422         return true;
 423 }
 424
 425 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 426                                 struct drm_display_mode *mode,
 427                                 struct drm_display_mode *adjusted_mode)
 428 {
 429         /*
 430          * The LVDS pin pair will already have been turned on in the
 431          * intel_crtc_mode_set since it has a large impact on the DPLL
 432          * settings.
 433          */
 434 }
 435
 436 /**
 437  * Detect the LVDS connection.
 438  *
 439  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 440  * connected and closed means disconnected.  We also send hotplug events as
 441  * needed, using lid status notification from the input layer.
 442  */
 443 static enum drm_connector_status
 444 intel_lvds_detect(struct drm_connector *connector, bool force)
 445 {
 446         struct drm_device *dev = connector->dev;
 447         enum drm_connector_status status;
 448
 449         status = intel_panel_detect(dev);
 450         if (status != connector_status_unknown)
 451                 return status;
 452
 453         return connector_status_connected;
 454 }
 455
 456 /**
 457  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 458  */
 459 static int intel_lvds_get_modes(struct drm_connector *connector)
 460 {
 461         struct intel_lvds_encoder *lvds_encoder = intel_attached_lvds(connector);
 462         struct drm_device *dev = connector->dev;
 463         struct drm_display_mode *mode;
 464
 465         if (lvds_encoder->edid)
 466                 return drm_add_edid_modes(connector, lvds_encoder->edid);
 467
 468         mode = drm_mode_duplicate(dev, lvds_encoder->fixed_mode);
 469         if (mode == NULL)
 470                 return 0;
 471
 472         drm_mode_probed_add(connector, mode);
 473         return 1;
 474 }
 475
 476 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 477 {
 478         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 479         return 1;
 480 }
 481
 482 /* The GPU hangs up on these systems if modeset is performed on LID open */
 483 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 484         {
 485                 .callback = intel_no_modeset_on_lid_dmi_callback,
 486                 .ident = "Toshiba Tecra A11",
 487                 .matches = {
 488                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 489                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 490                 },
 491         },
 492
 493         { }     /* terminating entry */
 494 };
 495
 496 /*
 497  * Lid events. Note the use of 'modeset_on_lid':
 498  *  - we set it on lid close, and reset it on open
 499  *  - we use it as a "only once" bit (ie we ignore
 500  *    duplicate events where it was already properly
 501  *    set/reset)
 502  *  - the suspend/resume paths will also set it to
 503  *    zero, since they restore the mode ("lid open").
 504  */
 505 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 506                             void *unused)
 507 {
 508         struct drm_i915_private *dev_priv =
 509                 container_of(nb, struct drm_i915_private, lid_notifier);
 510         struct drm_device *dev = dev_priv->dev;
 511         struct drm_connector *connector = dev_priv->int_lvds_connector;
 512
 513         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 514                 return NOTIFY_OK;
 515
 516         /*
 517          * check and update the status of LVDS connector after receiving
 518          * the LID nofication event.
 519          */
 520         if (connector)
 521                 connector->status = connector->funcs->detect(connector,
 522                                                              false);
 523
 524         /* Don't force modeset on machines where it causes a GPU lockup */
 525         if (dmi_check_system(intel_no_modeset_on_lid))
 526                 return NOTIFY_OK;
 527         if (!acpi_lid_open()) {
 528                 dev_priv->modeset_on_lid = 1;
 529                 return NOTIFY_OK;
 530         }
 531
 532         if (!dev_priv->modeset_on_lid)
 533                 return NOTIFY_OK;
 534
 535         dev_priv->modeset_on_lid = 0;
 536
 537         mutex_lock(&dev->mode_config.mutex);
 538         intel_modeset_check_state(dev);
 539         mutex_unlock(&dev->mode_config.mutex);
 540
 541         return NOTIFY_OK;
 542 }
 543
 544 /**
 545  * intel_lvds_destroy - unregister and free LVDS structures
 546  * @connector: connector to free
 547  *
 548  * Unregister the DDC bus for this connector then free the driver private
 549  * structure.
 550  */
 551 static void intel_lvds_destroy(struct drm_connector *connector)
 552 {
 553         struct drm_device *dev = connector->dev;
 554         struct drm_i915_private *dev_priv = dev->dev_private;
 555
 556         intel_panel_destroy_backlight(dev);
 557
 558         if (dev_priv->lid_notifier.notifier_call)
 559                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 560         drm_sysfs_connector_remove(connector);
 561         drm_connector_cleanup(connector);
 562         kfree(connector);
 563 }
 564
 565 static int intel_lvds_set_property(struct drm_connector *connector,
 566                                    struct drm_property *property,
 567                                    uint64_t value)
 568 {
 569         struct intel_lvds_encoder *lvds_encoder = intel_attached_lvds(connector);
 570         struct drm_device *dev = connector->dev;
 571
 572         if (property == dev->mode_config.scaling_mode_property) {
 573                 struct drm_crtc *crtc = lvds_encoder->base.base.crtc;
 574
 575                 if (value == DRM_MODE_SCALE_NONE) {
 576                         DRM_DEBUG_KMS("no scaling not supported\n");
 577                         return -EINVAL;
 578                 }
 579
 580                 if (lvds_encoder->fitting_mode == value) {
 581                         /* the LVDS scaling property is not changed */
 582                         return 0;
 583                 }
 584                 lvds_encoder->fitting_mode = value;
 585                 if (crtc && crtc->enabled) {
 586                         /*
 587                          * If the CRTC is enabled, the display will be changed
 588                          * according to the new panel fitting mode.
 589                          */
 590                         intel_set_mode(crtc, &crtc->mode,
 591                                        crtc->x, crtc->y, crtc->fb);
 592                 }
 593         }
 594
 595         return 0;
 596 }
 597
 598 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 599         .mode_fixup = intel_lvds_mode_fixup,
 600         .mode_set = intel_lvds_mode_set,
 601         .disable = intel_encoder_noop,
 602 };
 603
 604 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 605         .get_modes = intel_lvds_get_modes,
 606         .mode_valid = intel_lvds_mode_valid,
 607         .best_encoder = intel_best_encoder,
 608 };
 609
 610 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 611         .dpms = intel_connector_dpms,
 612         .detect = intel_lvds_detect,
 613         .fill_modes = drm_helper_probe_single_connector_modes,
 614         .set_property = intel_lvds_set_property,
 615         .destroy = intel_lvds_destroy,
 616 };
 617
 618 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 619         .destroy = intel_encoder_destroy,
 620 };
 621
 622 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 623 {
 624         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 625         return 1;
 626 }
 627
 628 /* These systems claim to have LVDS, but really don't */
 629 static const struct dmi_system_id intel_no_lvds[] = {
 630         {
 631                 .callback = intel_no_lvds_dmi_callback,
 632                 .ident = "Apple Mac Mini (Core series)",
 633                 .matches = {
 634                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 635                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 636                 },
 637         },
 638         {
 639                 .callback = intel_no_lvds_dmi_callback,
 640                 .ident = "Apple Mac Mini (Core 2 series)",
 641                 .matches = {
 642                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 643                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 644                 },
 645         },
 646         {
 647                 .callback = intel_no_lvds_dmi_callback,
 648                 .ident = "MSI IM-945GSE-A",
 649                 .matches = {
 650                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 651                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 652                 },
 653         },
 654         {
 655                 .callback = intel_no_lvds_dmi_callback,
 656                 .ident = "Dell Studio Hybrid",
 657                 .matches = {
 658                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 659                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 660                 },
 661         },
 662         {
 663                 .callback = intel_no_lvds_dmi_callback,
 664                 .ident = "Dell OptiPlex FX170",
 665                 .matches = {
 666                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 667                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 668                 },
 669         },
 670         {
 671                 .callback = intel_no_lvds_dmi_callback,
 672                 .ident = "AOpen Mini PC",
 673                 .matches = {
 674                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 675                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 676                 },
 677         },
 678         {
 679                 .callback = intel_no_lvds_dmi_callback,
 680                 .ident = "AOpen Mini PC MP915",
 681                 .matches = {
 682                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 683                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 684                 },
 685         },
 686         {
 687                 .callback = intel_no_lvds_dmi_callback,
 688                 .ident = "AOpen i915GMm-HFS",
 689                 .matches = {
 690                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 691                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 692                 },
 693         },
 694         {
 695                 .callback = intel_no_lvds_dmi_callback,
 696                 .ident = "AOpen i45GMx-I",
 697                 .matches = {
 698                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 699                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 700                 },
 701         },
 702         {
 703                 .callback = intel_no_lvds_dmi_callback,
 704                 .ident = "Aopen i945GTt-VFA",
 705                 .matches = {
 706                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 707                 },
 708         },
 709         {
 710                 .callback = intel_no_lvds_dmi_callback,
 711                 .ident = "Clientron U800",
 712                 .matches = {
 713                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 714                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 715                 },
 716         },
 717         {
 718                 .callback = intel_no_lvds_dmi_callback,
 719                 .ident = "Clientron E830",
 720                 .matches = {
 721                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 722                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 723                 },
 724         },
 725         {
 726                 .callback = intel_no_lvds_dmi_callback,
 727                 .ident = "Asus EeeBox PC EB1007",
 728                 .matches = {
 729                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 730                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 731                 },
 732         },
 733         {
 734                 .callback = intel_no_lvds_dmi_callback,
 735                 .ident = "Asus AT5NM10T-I",
 736                 .matches = {
 737                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 738                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 739                 },
 740         },
 741         {
 742                 .callback = intel_no_lvds_dmi_callback,
 743                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 744                 .matches = {
 745                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 746                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 747                 },
 748         },
 749         {
 750                 .callback = intel_no_lvds_dmi_callback,
 751                 .ident = "Hewlett-Packard t5745",
 752                 .matches = {
 753                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 754                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 755                 },
 756         },
 757         {
 758                 .callback = intel_no_lvds_dmi_callback,
 759                 .ident = "Hewlett-Packard st5747",
 760                 .matches = {
 761                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 762                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 763                 },
 764         },
 765         {
 766                 .callback = intel_no_lvds_dmi_callback,
 767                 .ident = "MSI Wind Box DC500",
 768                 .matches = {
 769                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 770                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 771                 },
 772         },
 773         {
 774                 .callback = intel_no_lvds_dmi_callback,
 775                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
 776                 .matches = {
 777                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
 778                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
 779                 },
 780         },
 781         {
 782                 .callback = intel_no_lvds_dmi_callback,
 783                 .ident = "Gigabyte GA-D525TUD",
 784                 .matches = {
 785                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 786                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 787                 },
 788         },
 789
 790         { }     /* terminating entry */
 791 };
 792
 793 /**
 794  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 795  * @dev: drm device
 796  * @connector: LVDS connector
 797  *
 798  * Find the reduced downclock for LVDS in EDID.
 799  */
 800 static void intel_find_lvds_downclock(struct drm_device *dev,
 801                                       struct drm_display_mode *fixed_mode,
 802                                       struct drm_connector *connector)
 803 {
 804         struct drm_i915_private *dev_priv = dev->dev_private;
 805         struct drm_display_mode *scan;
 806         int temp_downclock;
 807
 808         temp_downclock = fixed_mode->clock;
 809         list_for_each_entry(scan, &connector->probed_modes, head) {
 810                 /*
 811                  * If one mode has the same resolution with the fixed_panel
 812                  * mode while they have the different refresh rate, it means
 813                  * that the reduced downclock is found for the LVDS. In such
 814                  * case we can set the different FPx0/1 to dynamically select
 815                  * between low and high frequency.
 816                  */
 817                 if (scan->hdisplay == fixed_mode->hdisplay &&
 818                     scan->hsync_start == fixed_mode->hsync_start &&
 819                     scan->hsync_end == fixed_mode->hsync_end &&
 820                     scan->htotal == fixed_mode->htotal &&
 821                     scan->vdisplay == fixed_mode->vdisplay &&
 822                     scan->vsync_start == fixed_mode->vsync_start &&
 823                     scan->vsync_end == fixed_mode->vsync_end &&
 824                     scan->vtotal == fixed_mode->vtotal) {
 825                         if (scan->clock < temp_downclock) {
 826                                 /*
 827                                  * The downclock is already found. But we
 828                                  * expect to find the lower downclock.
 829                                  */
 830                                 temp_downclock = scan->clock;
 831                         }
 832                 }
 833         }
 834         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 835                 /* We found the downclock for LVDS. */
 836                 dev_priv->lvds_downclock_avail = 1;
 837                 dev_priv->lvds_downclock = temp_downclock;
 838                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 839                               "Normal clock %dKhz, downclock %dKhz\n",
 840                               fixed_mode->clock, temp_downclock);
 841         }
 842 }
 843
 844 /*
 845  * Enumerate the child dev array parsed from VBT to check whether
 846  * the LVDS is present.
 847  * If it is present, return 1.
 848  * If it is not present, return false.
 849  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 850  */
 851 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 852                                    u8 *i2c_pin)
 853 {
 854         struct drm_i915_private *dev_priv = dev->dev_private;
 855         int i;
 856
 857         if (!dev_priv->child_dev_num)
 858                 return true;
 859
 860         for (i = 0; i < dev_priv->child_dev_num; i++) {
 861                 struct child_device_config *child = dev_priv->child_dev + i;
 862
 863                 /* If the device type is not LFP, continue.
 864                  * We have to check both the new identifiers as well as the
 865                  * old for compatibility with some BIOSes.
 866                  */
 867                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 868                     child->device_type != DEVICE_TYPE_LFP)
 869                         continue;
 870
 871                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 872                         *i2c_pin = child->i2c_pin;
 873
 874                 /* However, we cannot trust the BIOS writers to populate
 875                  * the VBT correctly.  Since LVDS requires additional
 876                  * information from AIM blocks, a non-zero addin offset is
 877                  * a good indicator that the LVDS is actually present.
 878                  */
 879                 if (child->addin_offset)
 880                         return true;
 881
 882                 /* But even then some BIOS writers perform some black magic
 883                  * and instantiate the device without reference to any
 884                  * additional data.  Trust that if the VBT was written into
 885                  * the OpRegion then they have validated the LVDS's existence.
 886                  */
 887                 if (dev_priv->opregion.vbt)
 888                         return true;
 889         }
 890
 891         return false;
 892 }
 893
 894 static bool intel_lvds_supported(struct drm_device *dev)
 895 {
 896         /* With the introduction of the PCH we gained a dedicated
 897          * LVDS presence pin, use it. */
 898         if (HAS_PCH_SPLIT(dev))
 899                 return true;
 900
 901         /* Otherwise LVDS was only attached to mobile products,
 902          * except for the inglorious 830gm */
 903         return IS_MOBILE(dev) && !IS_I830(dev);
 904 }
 905
 906 /**
 907  * intel_lvds_init - setup LVDS connectors on this device
 908  * @dev: drm device
 909  *
 910  * Create the connector, register the LVDS DDC bus, and try to figure out what
 911  * modes we can display on the LVDS panel (if present).
 912  */
 913 bool intel_lvds_init(struct drm_device *dev)
 914 {
 915         struct drm_i915_private *dev_priv = dev->dev_private;
 916         struct intel_lvds_encoder *lvds_encoder;
 917         struct intel_encoder *intel_encoder;
 918         struct intel_lvds_connector *lvds_connector;
 919         struct intel_connector *intel_connector;
 920         struct drm_connector *connector;
 921         struct drm_encoder *encoder;
 922         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 923         struct drm_crtc *crtc;
 924         u32 lvds;
 925         int pipe;
 926         u8 pin;
 927
 928         if (!intel_lvds_supported(dev))
 929                 return false;
 930
 931         /* Skip init on machines we know falsely report LVDS */
 932         if (dmi_check_system(intel_no_lvds))
 933                 return false;
 934
 935         pin = GMBUS_PORT_PANEL;
 936         if (!lvds_is_present_in_vbt(dev, &pin)) {
 937                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 938                 return false;
 939         }
 940
 941         if (HAS_PCH_SPLIT(dev)) {
 942                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 943                         return false;
 944                 if (dev_priv->edp.support) {
 945                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 946                         return false;
 947                 }
 948         }
 949
 950         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 951         if (!lvds_encoder)
 952                 return false;
 953
 954         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 955         if (!lvds_connector) {
 956                 kfree(lvds_encoder);
 957                 return false;
 958         }
 959
 960         if (!HAS_PCH_SPLIT(dev)) {
 961                 lvds_encoder->pfit_control = I915_READ(PFIT_CONTROL);
 962         }
 963
 964         intel_encoder = &lvds_encoder->base;
 965         encoder = &intel_encoder->base;
 966         intel_connector = &lvds_connector->base;
 967         connector = &intel_connector->base;
 968         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 969                            DRM_MODE_CONNECTOR_LVDS);
 970
 971         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 972                          DRM_MODE_ENCODER_LVDS);
 973
 974         intel_encoder->enable = intel_enable_lvds;
 975         intel_encoder->disable = intel_disable_lvds;
 976         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 977         intel_connector->get_hw_state = intel_connector_get_hw_state;
 978
 979         intel_connector_attach_encoder(intel_connector, intel_encoder);
 980         intel_encoder->type = INTEL_OUTPUT_LVDS;
 981
 982         intel_encoder->cloneable = false;
 983         if (HAS_PCH_SPLIT(dev))
 984                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 985         else if (IS_GEN4(dev))
 986                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 987         else
 988                 intel_encoder->crtc_mask = (1 << 1);
 989
 990         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 991         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 992         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 993         connector->interlace_allowed = false;
 994         connector->doublescan_allowed = false;
 995
 996         /* create the scaling mode property */
 997         drm_mode_create_scaling_mode_property(dev);
 998         /*
 999          * the initial panel fitting mode will be FULL_SCREEN.
1000          */
1001
1002         drm_connector_attach_property(&intel_connector->base,
1003                                       dev->mode_config.scaling_mode_property,
1004                                       DRM_MODE_SCALE_ASPECT);
1005         lvds_encoder->fitting_mode = DRM_MODE_SCALE_ASPECT;
1006         /*
1007          * LVDS discovery:
1008          * 1) check for EDID on DDC
1009          * 2) check for VBT data
1010          * 3) check to see if LVDS is already on
1011          *    if none of the above, no panel
1012          * 4) make sure lid is open
1013          *    if closed, act like it's not there for now
1014          */
1015
1016         /*
1017          * Attempt to get the fixed panel mode from DDC.  Assume that the
1018          * preferred mode is the right one.
1019          */
1020         lvds_encoder->edid = drm_get_edid(connector,
1021                                           intel_gmbus_get_adapter(dev_priv, pin));
1022         if (lvds_encoder->edid) {
1023                 if (drm_add_edid_modes(connector, lvds_encoder->edid)) {
1024                         drm_mode_connector_update_edid_property(connector,
1025                                                                 lvds_encoder->edid);
1026                 } else {
1027                         kfree(lvds_encoder->edid);
1028                         lvds_encoder->edid = NULL;
1029                 }
1030         }
1031         if (!lvds_encoder->edid) {
1032                 /* Didn't get an EDID, so
1033                  * Set wide sync ranges so we get all modes
1034                  * handed to valid_mode for checking
1035                  */
1036                 connector->display_info.min_vfreq = 0;
1037                 connector->display_info.max_vfreq = 200;
1038                 connector->display_info.min_hfreq = 0;
1039                 connector->display_info.max_hfreq = 200;
1040         }
1041
1042         list_for_each_entry(scan, &connector->probed_modes, head) {
1043                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1044                         lvds_encoder->fixed_mode = drm_mode_duplicate(dev, scan);
1045                         intel_find_lvds_downclock(dev, lvds_encoder->fixed_mode,
1046                                                   connector);
1047                         goto out;
1048                 }
1049         }
1050
1051         /* Failed to get EDID, what about VBT? */
1052         if (dev_priv->lfp_lvds_vbt_mode) {
1053                 lvds_encoder->fixed_mode =
1054                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1055                 if (lvds_encoder->fixed_mode) {
1056                         lvds_encoder->fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1057                         goto out;
1058                 }
1059         }
1060
1061         /*
1062          * If we didn't get EDID, try checking if the panel is already turned
1063          * on.  If so, assume that whatever is currently programmed is the
1064          * correct mode.
1065          */
1066
1067         /* Ironlake: FIXME if still fail, not try pipe mode now */
1068         if (HAS_PCH_SPLIT(dev))
1069                 goto failed;
1070
1071         lvds = I915_READ(LVDS);
1072         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1073         crtc = intel_get_crtc_for_pipe(dev, pipe);
1074
1075         if (crtc && (lvds & LVDS_PORT_EN)) {
1076                 lvds_encoder->fixed_mode = intel_crtc_mode_get(dev, crtc);
1077                 if (lvds_encoder->fixed_mode) {
1078                         lvds_encoder->fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1079                         goto out;
1080                 }
1081         }
1082
1083         /* If we still don't have a mode after all that, give up. */
1084         if (!lvds_encoder->fixed_mode)
1085                 goto failed;
1086
1087 out:
1088         /*
1089          * Unlock registers and just
1090          * leave them unlocked
1091          */
1092         if (HAS_PCH_SPLIT(dev)) {
1093                 I915_WRITE(PCH_PP_CONTROL,
1094                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1095         } else {
1096                 I915_WRITE(PP_CONTROL,
1097                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1098         }
1099         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1100         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1101                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1102                 dev_priv->lid_notifier.notifier_call = NULL;
1103         }
1104         /* keep the LVDS connector */
1105         dev_priv->int_lvds_connector = connector;
1106         drm_sysfs_connector_add(connector);
1107
1108         intel_panel_setup_backlight(dev);
1109
1110         return true;
1111
1112 failed:
1113         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1114         drm_connector_cleanup(connector);
1115         drm_encoder_cleanup(encoder);
1116         kfree(lvds_encoder);
1117         kfree(lvds_connector);
1118         return false;
1119 }