sys/dev/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 <drm/drmP.h>
  31 #include <drm/drm_crtc.h>
  32 #include <drm/drm_edid.h>
  33 #include "intel_drv.h"
  34 #include <drm/i915_drm.h>
  35 #include "i915_drv.h"
  36 #include <linux/err.h>
  37
  38 /* Private structure for the integrated LVDS support */
  39 struct intel_lvds_connector {
  40         struct intel_connector base;
  41
  42 #if 0
  43         struct notifier_block lid_notifier;
  44 #endif
  45 };
  46
  47 struct intel_lvds_encoder {
  48         struct intel_encoder base;
  49
  50         u32 pfit_control;
  51         u32 pfit_pgm_ratios;
  52         bool pfit_dirty;
  53
  54         struct intel_lvds_connector *attached_connector;
  55 };
  56
  57 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  58 {
  59         return container_of(encoder, struct intel_lvds_encoder, base.base);
  60 }
  61
  62 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  63 {
  64         return container_of(connector, struct intel_lvds_connector, base.base);
  65 }
  66
  67 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  68                                     enum i915_pipe *pipe)
  69 {
  70         struct drm_device *dev = encoder->base.dev;
  71         struct drm_i915_private *dev_priv = dev->dev_private;
  72         u32 lvds_reg, tmp;
  73
  74         if (HAS_PCH_SPLIT(dev)) {
  75                 lvds_reg = PCH_LVDS;
  76         } else {
  77                 lvds_reg = LVDS;
  78         }
  79
  80         tmp = I915_READ(lvds_reg);
  81
  82         if (!(tmp & LVDS_PORT_EN))
  83                 return false;
  84
  85         if (HAS_PCH_CPT(dev))
  86                 *pipe = PORT_TO_PIPE_CPT(tmp);
  87         else
  88                 *pipe = PORT_TO_PIPE(tmp);
  89
  90         return true;
  91 }
  92
  93 /**
  94  * Sets the power state for the panel.
  95  */
  96 static void intel_enable_lvds(struct intel_encoder *encoder)
  97 {
  98         struct drm_device *dev = encoder->base.dev;
  99         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 100         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 101         struct drm_i915_private *dev_priv = dev->dev_private;
 102         u32 ctl_reg, lvds_reg, stat_reg;
 103
 104         if (HAS_PCH_SPLIT(dev)) {
 105                 ctl_reg = PCH_PP_CONTROL;
 106                 lvds_reg = PCH_LVDS;
 107                 stat_reg = PCH_PP_STATUS;
 108         } else {
 109                 ctl_reg = PP_CONTROL;
 110                 lvds_reg = LVDS;
 111                 stat_reg = PP_STATUS;
 112         }
 113
 114         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
 115
 116         if (lvds_encoder->pfit_dirty) {
 117                 /*
 118                  * Enable automatic panel scaling so that non-native modes
 119                  * fill the screen.  The panel fitter should only be
 120                  * adjusted whilst the pipe is disabled, according to
 121                  * register description and PRM.
 122                  */
 123                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
 124                               lvds_encoder->pfit_control,
 125                               lvds_encoder->pfit_pgm_ratios);
 126
 127                 I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
 128                 I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
 129                 lvds_encoder->pfit_dirty = false;
 130         }
 131
 132         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 133         POSTING_READ(lvds_reg);
 134         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 135                 DRM_ERROR("timed out waiting for panel to power on\n");
 136
 137         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 138 }
 139
 140 static void intel_disable_lvds(struct intel_encoder *encoder)
 141 {
 142         struct drm_device *dev = encoder->base.dev;
 143         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 144         struct drm_i915_private *dev_priv = dev->dev_private;
 145         u32 ctl_reg, lvds_reg, stat_reg;
 146
 147         if (HAS_PCH_SPLIT(dev)) {
 148                 ctl_reg = PCH_PP_CONTROL;
 149                 lvds_reg = PCH_LVDS;
 150                 stat_reg = PCH_PP_STATUS;
 151         } else {
 152                 ctl_reg = PP_CONTROL;
 153                 lvds_reg = LVDS;
 154                 stat_reg = PP_STATUS;
 155         }
 156
 157         intel_panel_disable_backlight(dev);
 158
 159         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 160         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 161                 DRM_ERROR("timed out waiting for panel to power off\n");
 162
 163         if (lvds_encoder->pfit_control) {
 164                 I915_WRITE(PFIT_CONTROL, 0);
 165                 lvds_encoder->pfit_dirty = true;
 166         }
 167
 168         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 169         POSTING_READ(lvds_reg);
 170 }
 171
 172 static int intel_lvds_mode_valid(struct drm_connector *connector,
 173                                  struct drm_display_mode *mode)
 174 {
 175         struct intel_connector *intel_connector = to_intel_connector(connector);
 176         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 177
 178         if (mode->hdisplay > fixed_mode->hdisplay)
 179                 return MODE_PANEL;
 180         if (mode->vdisplay > fixed_mode->vdisplay)
 181                 return MODE_PANEL;
 182
 183         return MODE_OK;
 184 }
 185
 186 static void
 187 centre_horizontally(struct drm_display_mode *mode,
 188                     int width)
 189 {
 190         u32 border, sync_pos, blank_width, sync_width;
 191
 192         /* keep the hsync and hblank widths constant */
 193         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 194         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 195         sync_pos = (blank_width - sync_width + 1) / 2;
 196
 197         border = (mode->hdisplay - width + 1) / 2;
 198         border += border & 1; /* make the border even */
 199
 200         mode->crtc_hdisplay = width;
 201         mode->crtc_hblank_start = width + border;
 202         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 203
 204         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 205         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 206
 207         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 208 }
 209
 210 static void
 211 centre_vertically(struct drm_display_mode *mode,
 212                   int height)
 213 {
 214         u32 border, sync_pos, blank_width, sync_width;
 215
 216         /* keep the vsync and vblank widths constant */
 217         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 218         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 219         sync_pos = (blank_width - sync_width + 1) / 2;
 220
 221         border = (mode->vdisplay - height + 1) / 2;
 222
 223         mode->crtc_vdisplay = height;
 224         mode->crtc_vblank_start = height + border;
 225         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 226
 227         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 228         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 229
 230         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 231 }
 232
 233 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 234 {
 235         /*
 236          * Floating point operation is not supported. So the FACTOR
 237          * is defined, which can avoid the floating point computation
 238          * when calculating the panel ratio.
 239          */
 240 #define ACCURACY 12
 241 #define FACTOR (1 << ACCURACY)
 242         u32 ratio = source * FACTOR / target;
 243         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 244 }
 245
 246 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 247                                   const struct drm_display_mode *mode,
 248                                   struct drm_display_mode *adjusted_mode)
 249 {
 250         struct drm_device *dev = encoder->dev;
 251         struct drm_i915_private *dev_priv = dev->dev_private;
 252         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(encoder);
 253         struct intel_connector *intel_connector =
 254                 &lvds_encoder->attached_connector->base;
 255         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 256         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 257         int pipe;
 258
 259         /* Should never happen!! */
 260         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 261                 DRM_ERROR("Can't support LVDS on pipe A\n");
 262                 return false;
 263         }
 264
 265         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
 266                 return false;
 267
 268         /*
 269          * We have timings from the BIOS for the panel, put them in
 270          * to the adjusted mode.  The CRTC will be set up for this mode,
 271          * with the panel scaling set up to source from the H/VDisplay
 272          * of the original mode.
 273          */
 274         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 275                                adjusted_mode);
 276
 277         if (HAS_PCH_SPLIT(dev)) {
 278                 intel_pch_panel_fitting(dev,
 279                                         intel_connector->panel.fitting_mode,
 280                                         mode, adjusted_mode);
 281                 return true;
 282         }
 283
 284         /* Native modes don't need fitting */
 285         if (adjusted_mode->hdisplay == mode->hdisplay &&
 286             adjusted_mode->vdisplay == mode->vdisplay)
 287                 goto out;
 288
 289         /* 965+ wants fuzzy fitting */
 290         if (INTEL_INFO(dev)->gen >= 4)
 291                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 292                                  PFIT_FILTER_FUZZY);
 293
 294         /*
 295          * Enable automatic panel scaling for non-native modes so that they fill
 296          * the screen.  Should be enabled before the pipe is enabled, according
 297          * to register description and PRM.
 298          * Change the value here to see the borders for debugging
 299          */
 300         for_each_pipe(pipe)
 301                 I915_WRITE(BCLRPAT(pipe), 0);
 302
 303         drm_mode_set_crtcinfo(adjusted_mode, 0);
 304
 305         switch (intel_connector->panel.fitting_mode) {
 306         case DRM_MODE_SCALE_CENTER:
 307                 /*
 308                  * For centered modes, we have to calculate border widths &
 309                  * heights and modify the values programmed into the CRTC.
 310                  */
 311                 centre_horizontally(adjusted_mode, mode->hdisplay);
 312                 centre_vertically(adjusted_mode, mode->vdisplay);
 313                 border = LVDS_BORDER_ENABLE;
 314                 break;
 315
 316         case DRM_MODE_SCALE_ASPECT:
 317                 /* Scale but preserve the aspect ratio */
 318                 if (INTEL_INFO(dev)->gen >= 4) {
 319                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 320                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 321
 322                         /* 965+ is easy, it does everything in hw */
 323                         if (scaled_width > scaled_height)
 324                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 325                         else if (scaled_width < scaled_height)
 326                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 327                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 328                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 329                 } else {
 330                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 331                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 332                         /*
 333                          * For earlier chips we have to calculate the scaling
 334                          * ratio by hand and program it into the
 335                          * PFIT_PGM_RATIO register
 336                          */
 337                         if (scaled_width > scaled_height) { /* pillar */
 338                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 339
 340                                 border = LVDS_BORDER_ENABLE;
 341                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 342                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 343                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 344                                                             bits << PFIT_VERT_SCALE_SHIFT);
 345                                         pfit_control |= (PFIT_ENABLE |
 346                                                          VERT_INTERP_BILINEAR |
 347                                                          HORIZ_INTERP_BILINEAR);
 348                                 }
 349                         } else if (scaled_width < scaled_height) { /* letter */
 350                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 351
 352                                 border = LVDS_BORDER_ENABLE;
 353                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 354                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 355                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 356                                                             bits << PFIT_VERT_SCALE_SHIFT);
 357                                         pfit_control |= (PFIT_ENABLE |
 358                                                          VERT_INTERP_BILINEAR |
 359                                                          HORIZ_INTERP_BILINEAR);
 360                                 }
 361                         } else
 362                                 /* Aspects match, Let hw scale both directions */
 363                                 pfit_control |= (PFIT_ENABLE |
 364                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 365                                                  VERT_INTERP_BILINEAR |
 366                                                  HORIZ_INTERP_BILINEAR);
 367                 }
 368                 break;
 369
 370         case DRM_MODE_SCALE_FULLSCREEN:
 371                 /*
 372                  * Full scaling, even if it changes the aspect ratio.
 373                  * Fortunately this is all done for us in hw.
 374                  */
 375                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 376                     mode->hdisplay != adjusted_mode->hdisplay) {
 377                         pfit_control |= PFIT_ENABLE;
 378                         if (INTEL_INFO(dev)->gen >= 4)
 379                                 pfit_control |= PFIT_SCALING_AUTO;
 380                         else
 381                                 pfit_control |= (VERT_AUTO_SCALE |
 382                                                  VERT_INTERP_BILINEAR |
 383                                                  HORIZ_AUTO_SCALE |
 384                                                  HORIZ_INTERP_BILINEAR);
 385                 }
 386                 break;
 387
 388         default:
 389                 break;
 390         }
 391
 392 out:
 393         /* If not enabling scaling, be consistent and always use 0. */
 394         if ((pfit_control & PFIT_ENABLE) == 0) {
 395                 pfit_control = 0;
 396                 pfit_pgm_ratios = 0;
 397         }
 398
 399         /* Make sure pre-965 set dither correctly */
 400         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 401                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 402
 403         if (pfit_control != lvds_encoder->pfit_control ||
 404             pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
 405                 lvds_encoder->pfit_control = pfit_control;
 406                 lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
 407                 lvds_encoder->pfit_dirty = true;
 408         }
 409         dev_priv->lvds_border_bits = border;
 410
 411         /*
 412          * XXX: It would be nice to support lower refresh rates on the
 413          * panels to reduce power consumption, and perhaps match the
 414          * user's requested refresh rate.
 415          */
 416
 417         return true;
 418 }
 419
 420 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 421                                 struct drm_display_mode *mode,
 422                                 struct drm_display_mode *adjusted_mode)
 423 {
 424         /*
 425          * The LVDS pin pair will already have been turned on in the
 426          * intel_crtc_mode_set since it has a large impact on the DPLL
 427          * settings.
 428          */
 429 }
 430
 431 /**
 432  * Detect the LVDS connection.
 433  *
 434  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 435  * connected and closed means disconnected.  We also send hotplug events as
 436  * needed, using lid status notification from the input layer.
 437  */
 438 static enum drm_connector_status
 439 intel_lvds_detect(struct drm_connector *connector, bool force)
 440 {
 441         struct drm_device *dev = connector->dev;
 442         enum drm_connector_status status;
 443
 444         status = intel_panel_detect(dev);
 445         if (status != connector_status_unknown)
 446                 return status;
 447
 448         return connector_status_connected;
 449 }
 450
 451 /**
 452  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 453  */
 454 static int intel_lvds_get_modes(struct drm_connector *connector)
 455 {
 456         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 457         struct drm_device *dev = connector->dev;
 458         struct drm_display_mode *mode;
 459
 460         /* use cached edid if we have one */
 461         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 462                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 463
 464         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 465         if (mode == NULL)
 466                 return 0;
 467
 468         drm_mode_probed_add(connector, mode);
 469         return 1;
 470 }
 471
 472 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 473 {
 474         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 475         return 1;
 476 }
 477
 478 /* The GPU hangs up on these systems if modeset is performed on LID open */
 479 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 480         {
 481                 .callback = intel_no_modeset_on_lid_dmi_callback,
 482                 .ident = "Toshiba Tecra A11",
 483                 .matches = {
 484                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 485                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 486                 },
 487         },
 488
 489         { }     /* terminating entry */
 490 };
 491
 492 #if 0
 493 /*
 494  * Lid events. Note the use of 'modeset_on_lid':
 495  *  - we set it on lid close, and reset it on open
 496  *  - we use it as a "only once" bit (ie we ignore
 497  *    duplicate events where it was already properly
 498  *    set/reset)
 499  *  - the suspend/resume paths will also set it to
 500  *    zero, since they restore the mode ("lid open").
 501  */
 502 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 503                             void *unused)
 504 {
 505         struct intel_lvds_connector *lvds_connector =
 506                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 507         struct drm_connector *connector = &lvds_connector->base.base;
 508         struct drm_device *dev = connector->dev;
 509         struct drm_i915_private *dev_priv = dev->dev_private;
 510
 511         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 512                 return NOTIFY_OK;
 513
 514         /*
 515          * check and update the status of LVDS connector after receiving
 516          * the LID nofication event.
 517          */
 518         connector->status = connector->funcs->detect(connector, false);
 519
 520         /* Don't force modeset on machines where it causes a GPU lockup */
 521         if (dmi_check_system(intel_no_modeset_on_lid))
 522                 return NOTIFY_OK;
 523         if (!acpi_lid_open()) {
 524                 dev_priv->modeset_on_lid = 1;
 525                 return NOTIFY_OK;
 526         }
 527
 528         if (!dev_priv->modeset_on_lid)
 529                 return NOTIFY_OK;
 530
 531         dev_priv->modeset_on_lid = 0;
 532
 533         mutex_lock(&dev->mode_config.mutex);
 534         intel_modeset_setup_hw_state(dev, true);
 535         mutex_unlock(&dev->mode_config.mutex);
 536
 537         return NOTIFY_OK;
 538 }
 539 #endif
 540
 541 /**
 542  * intel_lvds_destroy - unregister and free LVDS structures
 543  * @connector: connector to free
 544  *
 545  * Unregister the DDC bus for this connector then free the driver private
 546  * structure.
 547  */
 548 static void intel_lvds_destroy(struct drm_connector *connector)
 549 {
 550         struct intel_lvds_connector *lvds_connector =
 551                 to_lvds_connector(connector);
 552
 553 #if 0
 554         if (lvds_connector->lid_notifier.notifier_call)
 555                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 556 #endif
 557
 558         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 559                 kfree(lvds_connector->base.edid, DRM_MEM_KMS);
 560
 561         intel_panel_fini(&lvds_connector->base.panel);
 562
 563 #if 0
 564         drm_sysfs_connector_remove(connector);
 565 #endif
 566         drm_connector_cleanup(connector);
 567         kfree(connector, DRM_MEM_KMS);
 568 }
 569
 570 static int intel_lvds_set_property(struct drm_connector *connector,
 571                                    struct drm_property *property,
 572                                    uint64_t value)
 573 {
 574         struct intel_connector *intel_connector = to_intel_connector(connector);
 575         struct drm_device *dev = connector->dev;
 576
 577         if (property == dev->mode_config.scaling_mode_property) {
 578                 struct drm_crtc *crtc;
 579
 580                 if (value == DRM_MODE_SCALE_NONE) {
 581                         DRM_DEBUG_KMS("no scaling not supported\n");
 582                         return -EINVAL;
 583                 }
 584
 585                 if (intel_connector->panel.fitting_mode == value) {
 586                         /* the LVDS scaling property is not changed */
 587                         return 0;
 588                 }
 589                 intel_connector->panel.fitting_mode = value;
 590
 591                 crtc = intel_attached_encoder(connector)->base.crtc;
 592                 if (crtc && crtc->enabled) {
 593                         /*
 594                          * If the CRTC is enabled, the display will be changed
 595                          * according to the new panel fitting mode.
 596                          */
 597                         intel_set_mode(crtc, &crtc->mode,
 598                                        crtc->x, crtc->y, crtc->fb);
 599                 }
 600         }
 601
 602         return 0;
 603 }
 604
 605 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 606         .mode_fixup = intel_lvds_mode_fixup,
 607         .mode_set = intel_lvds_mode_set,
 608         .disable = intel_encoder_noop,
 609 };
 610
 611 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 612         .get_modes = intel_lvds_get_modes,
 613         .mode_valid = intel_lvds_mode_valid,
 614         .best_encoder = intel_best_encoder,
 615 };
 616
 617 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 618         .dpms = intel_connector_dpms,
 619         .detect = intel_lvds_detect,
 620         .fill_modes = drm_helper_probe_single_connector_modes,
 621         .set_property = intel_lvds_set_property,
 622         .destroy = intel_lvds_destroy,
 623 };
 624
 625 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 626         .destroy = intel_encoder_destroy,
 627 };
 628
 629 static int intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 630 {
 631         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 632         return 1;
 633 }
 634
 635 /* These systems claim to have LVDS, but really don't */
 636 static const struct dmi_system_id intel_no_lvds[] = {
 637         {
 638                 .callback = intel_no_lvds_dmi_callback,
 639                 .ident = "Apple Mac Mini (Core series)",
 640                 .matches = {
 641                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 642                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 643                 },
 644         },
 645         {
 646                 .callback = intel_no_lvds_dmi_callback,
 647                 .ident = "Apple Mac Mini (Core 2 series)",
 648                 .matches = {
 649                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 650                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 651                 },
 652         },
 653         {
 654                 .callback = intel_no_lvds_dmi_callback,
 655                 .ident = "MSI IM-945GSE-A",
 656                 .matches = {
 657                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 658                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 659                 },
 660         },
 661         {
 662                 .callback = intel_no_lvds_dmi_callback,
 663                 .ident = "Dell Studio Hybrid",
 664                 .matches = {
 665                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 666                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 667                 },
 668         },
 669         {
 670                 .callback = intel_no_lvds_dmi_callback,
 671                 .ident = "Dell OptiPlex FX170",
 672                 .matches = {
 673                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 674                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 675                 },
 676         },
 677         {
 678                 .callback = intel_no_lvds_dmi_callback,
 679                 .ident = "AOpen Mini PC",
 680                 .matches = {
 681                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 682                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 683                 },
 684         },
 685         {
 686                 .callback = intel_no_lvds_dmi_callback,
 687                 .ident = "AOpen Mini PC MP915",
 688                 .matches = {
 689                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 690                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 691                 },
 692         },
 693         {
 694                 .callback = intel_no_lvds_dmi_callback,
 695                 .ident = "AOpen i915GMm-HFS",
 696                 .matches = {
 697                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 698                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 699                 },
 700         },
 701         {
 702                 .callback = intel_no_lvds_dmi_callback,
 703                 .ident = "AOpen i45GMx-I",
 704                 .matches = {
 705                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 706                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 707                 },
 708         },
 709         {
 710                 .callback = intel_no_lvds_dmi_callback,
 711                 .ident = "Aopen i945GTt-VFA",
 712                 .matches = {
 713                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 714                 },
 715         },
 716         {
 717                 .callback = intel_no_lvds_dmi_callback,
 718                 .ident = "Clientron U800",
 719                 .matches = {
 720                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 721                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 722                 },
 723         },
 724         {
 725                 .callback = intel_no_lvds_dmi_callback,
 726                 .ident = "Clientron E830",
 727                 .matches = {
 728                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 729                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 730                 },
 731         },
 732         {
 733                 .callback = intel_no_lvds_dmi_callback,
 734                 .ident = "Asus EeeBox PC EB1007",
 735                 .matches = {
 736                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 737                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 738                 },
 739         },
 740         {
 741                 .callback = intel_no_lvds_dmi_callback,
 742                 .ident = "Asus AT5NM10T-I",
 743                 .matches = {
 744                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 745                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 746                 },
 747         },
 748         {
 749                 .callback = intel_no_lvds_dmi_callback,
 750                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 751                 .matches = {
 752                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 753                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 754                 },
 755         },
 756         {
 757                 .callback = intel_no_lvds_dmi_callback,
 758                 .ident = "Hewlett-Packard t5745",
 759                 .matches = {
 760                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 761                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 762                 },
 763         },
 764         {
 765                 .callback = intel_no_lvds_dmi_callback,
 766                 .ident = "Hewlett-Packard st5747",
 767                 .matches = {
 768                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 769                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 770                 },
 771         },
 772         {
 773                 .callback = intel_no_lvds_dmi_callback,
 774                 .ident = "MSI Wind Box DC500",
 775                 .matches = {
 776                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 777                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 778                 },
 779         },
 780         {
 781                 .callback = intel_no_lvds_dmi_callback,
 782                 .ident = "Gigabyte GA-D525TUD",
 783                 .matches = {
 784                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 785                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 786                 },
 787         },
 788         {
 789                 .callback = intel_no_lvds_dmi_callback,
 790                 .ident = "Supermicro X7SPA-H",
 791                 .matches = {
 792                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 793                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 794                 },
 795         },
 796         {
 797                 .callback = intel_no_lvds_dmi_callback,
 798                 .ident = "Fujitsu Esprimo Q900",
 799                 .matches = {
 800                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 801                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 802                 },
 803         },
 804
 805         { }     /* terminating entry */
 806 };
 807
 808 /**
 809  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 810  * @dev: drm device
 811  * @connector: LVDS connector
 812  *
 813  * Find the reduced downclock for LVDS in EDID.
 814  */
 815 static void intel_find_lvds_downclock(struct drm_device *dev,
 816                                       struct drm_display_mode *fixed_mode,
 817                                       struct drm_connector *connector)
 818 {
 819         struct drm_i915_private *dev_priv = dev->dev_private;
 820         struct drm_display_mode *scan;
 821         int temp_downclock;
 822
 823         temp_downclock = fixed_mode->clock;
 824         list_for_each_entry(scan, &connector->probed_modes, head) {
 825                 /*
 826                  * If one mode has the same resolution with the fixed_panel
 827                  * mode while they have the different refresh rate, it means
 828                  * that the reduced downclock is found for the LVDS. In such
 829                  * case we can set the different FPx0/1 to dynamically select
 830                  * between low and high frequency.
 831                  */
 832                 if (scan->hdisplay == fixed_mode->hdisplay &&
 833                     scan->hsync_start == fixed_mode->hsync_start &&
 834                     scan->hsync_end == fixed_mode->hsync_end &&
 835                     scan->htotal == fixed_mode->htotal &&
 836                     scan->vdisplay == fixed_mode->vdisplay &&
 837                     scan->vsync_start == fixed_mode->vsync_start &&
 838                     scan->vsync_end == fixed_mode->vsync_end &&
 839                     scan->vtotal == fixed_mode->vtotal) {
 840                         if (scan->clock < temp_downclock) {
 841                                 /*
 842                                  * The downclock is already found. But we
 843                                  * expect to find the lower downclock.
 844                                  */
 845                                 temp_downclock = scan->clock;
 846                         }
 847                 }
 848         }
 849         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 850                 /* We found the downclock for LVDS. */
 851                 dev_priv->lvds_downclock_avail = 1;
 852                 dev_priv->lvds_downclock = temp_downclock;
 853                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 854                               "Normal clock %dKhz, downclock %dKhz\n",
 855                               fixed_mode->clock, temp_downclock);
 856         }
 857 }
 858
 859 /*
 860  * Enumerate the child dev array parsed from VBT to check whether
 861  * the LVDS is present.
 862  * If it is present, return 1.
 863  * If it is not present, return false.
 864  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 865  */
 866 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 867                                    u8 *i2c_pin)
 868 {
 869         struct drm_i915_private *dev_priv = dev->dev_private;
 870         int i;
 871
 872         if (!dev_priv->child_dev_num)
 873                 return true;
 874
 875         for (i = 0; i < dev_priv->child_dev_num; i++) {
 876                 struct child_device_config *child = dev_priv->child_dev + i;
 877
 878                 /* If the device type is not LFP, continue.
 879                  * We have to check both the new identifiers as well as the
 880                  * old for compatibility with some BIOSes.
 881                  */
 882                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 883                     child->device_type != DEVICE_TYPE_LFP)
 884                         continue;
 885
 886                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 887                         *i2c_pin = child->i2c_pin;
 888
 889                 /* However, we cannot trust the BIOS writers to populate
 890                  * the VBT correctly.  Since LVDS requires additional
 891                  * information from AIM blocks, a non-zero addin offset is
 892                  * a good indicator that the LVDS is actually present.
 893                  */
 894                 if (child->addin_offset)
 895                         return true;
 896
 897                 /* But even then some BIOS writers perform some black magic
 898                  * and instantiate the device without reference to any
 899                  * additional data.  Trust that if the VBT was written into
 900                  * the OpRegion then they have validated the LVDS's existence.
 901                  */
 902                 if (dev_priv->opregion.vbt)
 903                         return true;
 904         }
 905
 906         return false;
 907 }
 908
 909 static bool intel_lvds_supported(struct drm_device *dev)
 910 {
 911         /* With the introduction of the PCH we gained a dedicated
 912          * LVDS presence pin, use it. */
 913         if (HAS_PCH_SPLIT(dev))
 914                 return true;
 915
 916         /* Otherwise LVDS was only attached to mobile products,
 917          * except for the inglorious 830gm */
 918         return IS_MOBILE(dev) && !IS_I830(dev);
 919 }
 920
 921 /**
 922  * intel_lvds_init - setup LVDS connectors on this device
 923  * @dev: drm device
 924  *
 925  * Create the connector, register the LVDS DDC bus, and try to figure out what
 926  * modes we can display on the LVDS panel (if present).
 927  */
 928 bool intel_lvds_init(struct drm_device *dev)
 929 {
 930         struct drm_i915_private *dev_priv = dev->dev_private;
 931         struct intel_lvds_encoder *lvds_encoder;
 932         struct intel_encoder *intel_encoder;
 933         struct intel_lvds_connector *lvds_connector;
 934         struct intel_connector *intel_connector;
 935         struct drm_connector *connector;
 936         struct drm_encoder *encoder;
 937         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 938         struct drm_display_mode *fixed_mode = NULL;
 939         struct edid *edid;
 940         struct drm_crtc *crtc;
 941         u32 lvds;
 942         int pipe;
 943         u8 pin;
 944
 945         if (!intel_lvds_supported(dev))
 946                 return false;
 947
 948         /* Skip init on machines we know falsely report LVDS */
 949         if (dmi_check_system(intel_no_lvds))
 950                 return false;
 951
 952         pin = GMBUS_PORT_PANEL;
 953         if (!lvds_is_present_in_vbt(dev, &pin)) {
 954                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 955                 return false;
 956         }
 957
 958         if (HAS_PCH_SPLIT(dev)) {
 959                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 960                         return false;
 961                 if (dev_priv->edp.support) {
 962                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 963                         return false;
 964                 }
 965         }
 966
 967         lvds_encoder = kmalloc(sizeof(struct intel_lvds_encoder), DRM_MEM_KMS,
 968             M_WAITOK | M_ZERO);
 969         if (!lvds_encoder)
 970                 return false;
 971
 972         lvds_connector = kmalloc(sizeof(struct intel_lvds_connector), DRM_MEM_KMS,
 973             M_WAITOK | M_ZERO);
 974         if (!lvds_connector) {
 975                 kfree(lvds_encoder, DRM_MEM_KMS);
 976                 return false;
 977         }
 978
 979         lvds_encoder->attached_connector = lvds_connector;
 980
 981         if (!HAS_PCH_SPLIT(dev)) {
 982                 lvds_encoder->pfit_control = I915_READ(PFIT_CONTROL);
 983         }
 984
 985         intel_encoder = &lvds_encoder->base;
 986         encoder = &intel_encoder->base;
 987         intel_connector = &lvds_connector->base;
 988         connector = &intel_connector->base;
 989         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 990                            DRM_MODE_CONNECTOR_LVDS);
 991
 992         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 993                          DRM_MODE_ENCODER_LVDS);
 994
 995         intel_encoder->enable = intel_enable_lvds;
 996         intel_encoder->disable = intel_disable_lvds;
 997         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 998         intel_connector->get_hw_state = intel_connector_get_hw_state;
 999
1000         intel_connector_attach_encoder(intel_connector, intel_encoder);
1001         intel_encoder->type = INTEL_OUTPUT_LVDS;
1002
1003         intel_encoder->cloneable = false;
1004         if (HAS_PCH_SPLIT(dev))
1005                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
1006         else if (IS_GEN4(dev))
1007                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
1008         else
1009                 intel_encoder->crtc_mask = (1 << 1);
1010
1011         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
1012         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
1013         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1014         connector->interlace_allowed = false;
1015         connector->doublescan_allowed = false;
1016
1017         /* create the scaling mode property */
1018         drm_mode_create_scaling_mode_property(dev);
1019
1020         drm_object_attach_property(&connector->base,
1021                                       dev->mode_config.scaling_mode_property,
1022                                       DRM_MODE_SCALE_ASPECT);
1023         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1024         /*
1025          * LVDS discovery:
1026          * 1) check for EDID on DDC
1027          * 2) check for VBT data
1028          * 3) check to see if LVDS is already on
1029          *    if none of the above, no panel
1030          * 4) make sure lid is open
1031          *    if closed, act like it's not there for now
1032          */
1033
1034         /*
1035          * Attempt to get the fixed panel mode from DDC.  Assume that the
1036          * preferred mode is the right one.
1037          */
1038         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1039         if (edid) {
1040                 if (drm_add_edid_modes(connector, edid)) {
1041                         drm_mode_connector_update_edid_property(connector,
1042                                                                 edid);
1043                 } else {
1044                         kfree(edid, DRM_MEM_KMS);
1045                         edid = ERR_PTR(-EINVAL);
1046                 }
1047         } else {
1048                 edid = ERR_PTR(-ENOENT);
1049         }
1050         lvds_connector->base.edid = edid;
1051
1052         if (IS_ERR_OR_NULL(edid)) {
1053                 /* Didn't get an EDID, so
1054                  * Set wide sync ranges so we get all modes
1055                  * handed to valid_mode for checking
1056                  */
1057                 connector->display_info.min_vfreq = 0;
1058                 connector->display_info.max_vfreq = 200;
1059                 connector->display_info.min_hfreq = 0;
1060                 connector->display_info.max_hfreq = 200;
1061         }
1062
1063         list_for_each_entry(scan, &connector->probed_modes, head) {
1064                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1065                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1066                         drm_mode_debug_printmodeline(scan);
1067
1068                         fixed_mode = drm_mode_duplicate(dev, scan);
1069                         if (fixed_mode) {
1070                                 intel_find_lvds_downclock(dev, fixed_mode,
1071                                                           connector);
1072                                 goto out;
1073                         }
1074                 }
1075         }
1076
1077         /* Failed to get EDID, what about VBT? */
1078         if (dev_priv->lfp_lvds_vbt_mode) {
1079                 DRM_DEBUG_KMS("using mode from VBT: ");
1080                 drm_mode_debug_printmodeline(dev_priv->lfp_lvds_vbt_mode);
1081
1082                 fixed_mode = drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1083                 if (fixed_mode) {
1084                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1085                         goto out;
1086                 }
1087         }
1088
1089         /*
1090          * If we didn't get EDID, try checking if the panel is already turned
1091          * on.  If so, assume that whatever is currently programmed is the
1092          * correct mode.
1093          */
1094
1095         /* Ironlake: FIXME if still fail, not try pipe mode now */
1096         if (HAS_PCH_SPLIT(dev))
1097                 goto failed;
1098
1099         lvds = I915_READ(LVDS);
1100         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1101         crtc = intel_get_crtc_for_pipe(dev, pipe);
1102
1103         if (crtc && (lvds & LVDS_PORT_EN)) {
1104                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1105                 if (fixed_mode) {
1106                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1107                         drm_mode_debug_printmodeline(fixed_mode);
1108                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1109                         goto out;
1110                 }
1111         }
1112
1113         /* If we still don't have a mode after all that, give up. */
1114         if (!fixed_mode)
1115                 goto failed;
1116
1117 out:
1118         /*
1119          * Unlock registers and just
1120          * leave them unlocked
1121          */
1122         if (HAS_PCH_SPLIT(dev)) {
1123                 I915_WRITE(PCH_PP_CONTROL,
1124                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1125         } else {
1126                 I915_WRITE(PP_CONTROL,
1127                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1128         }
1129 #if 0
1130         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1131         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1132                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1133                 lvds_connector->lid_notifier.notifier_call = NULL;
1134         }
1135         drm_sysfs_connector_add(connector);
1136 #endif
1137
1138         intel_panel_init(&intel_connector->panel, fixed_mode);
1139         intel_panel_setup_backlight(connector);
1140
1141         return true;
1142
1143 failed:
1144         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1145         drm_connector_cleanup(connector);
1146         drm_encoder_cleanup(encoder);
1147         if (fixed_mode)
1148                 drm_mode_destroy(dev, fixed_mode);
1149         kfree(lvds_encoder, DRM_MEM_KMS);
1150         kfree(lvds_connector, DRM_MEM_KMS);
1151         return false;
1152 }