drivers/gpu/drm/i915/intel_lvds.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  */
  29
  30 #include <acpi/button.h>
  31 #include <linux/dmi.h>
  32 #include <linux/i2c.h>
  33 #include <linux/slab.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_crtc.h>
  36 #include <drm/drm_edid.h>
  37 #include "intel_drv.h"
  38 #include <drm/i915_drm.h>
  39 #include "i915_drv.h"
  40 #include <linux/acpi.h>
  41
  42 /* Private structure for the integrated LVDS support */
  43 struct intel_lvds_connector {
  44         struct intel_connector base;
  45
  46         struct notifier_block lid_notifier;
  47         struct edid *edid;
  48         int fitting_mode;
  49 };
  50
  51 struct intel_lvds_encoder {
  52         struct intel_encoder base;
  53
  54         u32 pfit_control;
  55         u32 pfit_pgm_ratios;
  56         bool pfit_dirty;
  57
  58         struct intel_lvds_connector *attached_connector;
  59 };
  60
  61 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  62 {
  63         return container_of(encoder, struct intel_lvds_encoder, base.base);
  64 }
  65
  66 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  67 {
  68         return container_of(connector, struct intel_lvds_connector, base.base);
  69 }
  70
  71 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  72                                     enum pipe *pipe)
  73 {
  74         struct drm_device *dev = encoder->base.dev;
  75         struct drm_i915_private *dev_priv = dev->dev_private;
  76         u32 lvds_reg, tmp;
  77
  78         if (HAS_PCH_SPLIT(dev)) {
  79                 lvds_reg = PCH_LVDS;
  80         } else {
  81                 lvds_reg = LVDS;
  82         }
  83
  84         tmp = I915_READ(lvds_reg);
  85
  86         if (!(tmp & LVDS_PORT_EN))
  87                 return false;
  88
  89         if (HAS_PCH_CPT(dev))
  90                 *pipe = PORT_TO_PIPE_CPT(tmp);
  91         else
  92                 *pipe = PORT_TO_PIPE(tmp);
  93
  94         return true;
  95 }
  96
  97 /**
  98  * Sets the power state for the panel.
  99  */
 100 static void intel_enable_lvds(struct intel_encoder *encoder)
 101 {
 102         struct drm_device *dev = encoder->base.dev;
 103         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 104         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 105         struct drm_i915_private *dev_priv = dev->dev_private;
 106         u32 ctl_reg, lvds_reg, stat_reg;
 107
 108         if (HAS_PCH_SPLIT(dev)) {
 109                 ctl_reg = PCH_PP_CONTROL;
 110                 lvds_reg = PCH_LVDS;
 111                 stat_reg = PCH_PP_STATUS;
 112         } else {
 113                 ctl_reg = PP_CONTROL;
 114                 lvds_reg = LVDS;
 115                 stat_reg = PP_STATUS;
 116         }
 117
 118         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
 119
 120         if (lvds_encoder->pfit_dirty) {
 121                 /*
 122                  * Enable automatic panel scaling so that non-native modes
 123                  * fill the screen.  The panel fitter should only be
 124                  * adjusted whilst the pipe is disabled, according to
 125                  * register description and PRM.
 126                  */
 127                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
 128                               lvds_encoder->pfit_control,
 129                               lvds_encoder->pfit_pgm_ratios);
 130
 131                 I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
 132                 I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
 133                 lvds_encoder->pfit_dirty = false;
 134         }
 135
 136         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 137         POSTING_READ(lvds_reg);
 138         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 139                 DRM_ERROR("timed out waiting for panel to power on\n");
 140
 141         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 142 }
 143
 144 static void intel_disable_lvds(struct intel_encoder *encoder)
 145 {
 146         struct drm_device *dev = encoder->base.dev;
 147         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 148         struct drm_i915_private *dev_priv = dev->dev_private;
 149         u32 ctl_reg, lvds_reg, stat_reg;
 150
 151         if (HAS_PCH_SPLIT(dev)) {
 152                 ctl_reg = PCH_PP_CONTROL;
 153                 lvds_reg = PCH_LVDS;
 154                 stat_reg = PCH_PP_STATUS;
 155         } else {
 156                 ctl_reg = PP_CONTROL;
 157                 lvds_reg = LVDS;
 158                 stat_reg = PP_STATUS;
 159         }
 160
 161         intel_panel_disable_backlight(dev);
 162
 163         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 164         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 165                 DRM_ERROR("timed out waiting for panel to power off\n");
 166
 167         if (lvds_encoder->pfit_control) {
 168                 I915_WRITE(PFIT_CONTROL, 0);
 169                 lvds_encoder->pfit_dirty = true;
 170         }
 171
 172         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 173         POSTING_READ(lvds_reg);
 174 }
 175
 176 static int intel_lvds_mode_valid(struct drm_connector *connector,
 177                                  struct drm_display_mode *mode)
 178 {
 179         struct intel_connector *intel_connector = to_intel_connector(connector);
 180         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 181
 182         if (mode->hdisplay > fixed_mode->hdisplay)
 183                 return MODE_PANEL;
 184         if (mode->vdisplay > fixed_mode->vdisplay)
 185                 return MODE_PANEL;
 186
 187         return MODE_OK;
 188 }
 189
 190 static void
 191 centre_horizontally(struct drm_display_mode *mode,
 192                     int width)
 193 {
 194         u32 border, sync_pos, blank_width, sync_width;
 195
 196         /* keep the hsync and hblank widths constant */
 197         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 198         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 199         sync_pos = (blank_width - sync_width + 1) / 2;
 200
 201         border = (mode->hdisplay - width + 1) / 2;
 202         border += border & 1; /* make the border even */
 203
 204         mode->crtc_hdisplay = width;
 205         mode->crtc_hblank_start = width + border;
 206         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 207
 208         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 209         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 210
 211         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 212 }
 213
 214 static void
 215 centre_vertically(struct drm_display_mode *mode,
 216                   int height)
 217 {
 218         u32 border, sync_pos, blank_width, sync_width;
 219
 220         /* keep the vsync and vblank widths constant */
 221         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 222         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 223         sync_pos = (blank_width - sync_width + 1) / 2;
 224
 225         border = (mode->vdisplay - height + 1) / 2;
 226
 227         mode->crtc_vdisplay = height;
 228         mode->crtc_vblank_start = height + border;
 229         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 230
 231         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 232         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 233
 234         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 235 }
 236
 237 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 238 {
 239         /*
 240          * Floating point operation is not supported. So the FACTOR
 241          * is defined, which can avoid the floating point computation
 242          * when calculating the panel ratio.
 243          */
 244 #define ACCURACY 12
 245 #define FACTOR (1 << ACCURACY)
 246         u32 ratio = source * FACTOR / target;
 247         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 248 }
 249
 250 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 251                                   const struct drm_display_mode *mode,
 252                                   struct drm_display_mode *adjusted_mode)
 253 {
 254         struct drm_device *dev = encoder->dev;
 255         struct drm_i915_private *dev_priv = dev->dev_private;
 256         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(encoder);
 257         struct intel_lvds_connector *lvds_connector =
 258                 lvds_encoder->attached_connector;
 259         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 260         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 261         int pipe;
 262
 263         /* Should never happen!! */
 264         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 265                 DRM_ERROR("Can't support LVDS on pipe A\n");
 266                 return false;
 267         }
 268
 269         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
 270                 return false;
 271
 272         /*
 273          * We have timings from the BIOS for the panel, put them in
 274          * to the adjusted mode.  The CRTC will be set up for this mode,
 275          * with the panel scaling set up to source from the H/VDisplay
 276          * of the original mode.
 277          */
 278         intel_fixed_panel_mode(lvds_connector->base.panel.fixed_mode,
 279                                adjusted_mode);
 280
 281         if (HAS_PCH_SPLIT(dev)) {
 282                 intel_pch_panel_fitting(dev, lvds_connector->fitting_mode,
 283                                         mode, adjusted_mode);
 284                 return true;
 285         }
 286
 287         /* Native modes don't need fitting */
 288         if (adjusted_mode->hdisplay == mode->hdisplay &&
 289             adjusted_mode->vdisplay == mode->vdisplay)
 290                 goto out;
 291
 292         /* 965+ wants fuzzy fitting */
 293         if (INTEL_INFO(dev)->gen >= 4)
 294                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 295                                  PFIT_FILTER_FUZZY);
 296
 297         /*
 298          * Enable automatic panel scaling for non-native modes so that they fill
 299          * the screen.  Should be enabled before the pipe is enabled, according
 300          * to register description and PRM.
 301          * Change the value here to see the borders for debugging
 302          */
 303         for_each_pipe(pipe)
 304                 I915_WRITE(BCLRPAT(pipe), 0);
 305
 306         drm_mode_set_crtcinfo(adjusted_mode, 0);
 307
 308         switch (lvds_connector->fitting_mode) {
 309         case DRM_MODE_SCALE_CENTER:
 310                 /*
 311                  * For centered modes, we have to calculate border widths &
 312                  * heights and modify the values programmed into the CRTC.
 313                  */
 314                 centre_horizontally(adjusted_mode, mode->hdisplay);
 315                 centre_vertically(adjusted_mode, mode->vdisplay);
 316                 border = LVDS_BORDER_ENABLE;
 317                 break;
 318
 319         case DRM_MODE_SCALE_ASPECT:
 320                 /* Scale but preserve the aspect ratio */
 321                 if (INTEL_INFO(dev)->gen >= 4) {
 322                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 323                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 324
 325                         /* 965+ is easy, it does everything in hw */
 326                         if (scaled_width > scaled_height)
 327                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 328                         else if (scaled_width < scaled_height)
 329                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 330                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 331                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 332                 } else {
 333                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 334                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 335                         /*
 336                          * For earlier chips we have to calculate the scaling
 337                          * ratio by hand and program it into the
 338                          * PFIT_PGM_RATIO register
 339                          */
 340                         if (scaled_width > scaled_height) { /* pillar */
 341                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 342
 343                                 border = LVDS_BORDER_ENABLE;
 344                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 345                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 346                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 347                                                             bits << PFIT_VERT_SCALE_SHIFT);
 348                                         pfit_control |= (PFIT_ENABLE |
 349                                                          VERT_INTERP_BILINEAR |
 350                                                          HORIZ_INTERP_BILINEAR);
 351                                 }
 352                         } else if (scaled_width < scaled_height) { /* letter */
 353                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 354
 355                                 border = LVDS_BORDER_ENABLE;
 356                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 357                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 358                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 359                                                             bits << PFIT_VERT_SCALE_SHIFT);
 360                                         pfit_control |= (PFIT_ENABLE |
 361                                                          VERT_INTERP_BILINEAR |
 362                                                          HORIZ_INTERP_BILINEAR);
 363                                 }
 364                         } else
 365                                 /* Aspects match, Let hw scale both directions */
 366                                 pfit_control |= (PFIT_ENABLE |
 367                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 368                                                  VERT_INTERP_BILINEAR |
 369                                                  HORIZ_INTERP_BILINEAR);
 370                 }
 371                 break;
 372
 373         case DRM_MODE_SCALE_FULLSCREEN:
 374                 /*
 375                  * Full scaling, even if it changes the aspect ratio.
 376                  * Fortunately this is all done for us in hw.
 377                  */
 378                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 379                     mode->hdisplay != adjusted_mode->hdisplay) {
 380                         pfit_control |= PFIT_ENABLE;
 381                         if (INTEL_INFO(dev)->gen >= 4)
 382                                 pfit_control |= PFIT_SCALING_AUTO;
 383                         else
 384                                 pfit_control |= (VERT_AUTO_SCALE |
 385                                                  VERT_INTERP_BILINEAR |
 386                                                  HORIZ_AUTO_SCALE |
 387                                                  HORIZ_INTERP_BILINEAR);
 388                 }
 389                 break;
 390
 391         default:
 392                 break;
 393         }
 394
 395 out:
 396         /* If not enabling scaling, be consistent and always use 0. */
 397         if ((pfit_control & PFIT_ENABLE) == 0) {
 398                 pfit_control = 0;
 399                 pfit_pgm_ratios = 0;
 400         }
 401
 402         /* Make sure pre-965 set dither correctly */
 403         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 404                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 405
 406         if (pfit_control != lvds_encoder->pfit_control ||
 407             pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
 408                 lvds_encoder->pfit_control = pfit_control;
 409                 lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
 410                 lvds_encoder->pfit_dirty = true;
 411         }
 412         dev_priv->lvds_border_bits = border;
 413
 414         /*
 415          * XXX: It would be nice to support lower refresh rates on the
 416          * panels to reduce power consumption, and perhaps match the
 417          * user's requested refresh rate.
 418          */
 419
 420         return true;
 421 }
 422
 423 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 424                                 struct drm_display_mode *mode,
 425                                 struct drm_display_mode *adjusted_mode)
 426 {
 427         /*
 428          * The LVDS pin pair will already have been turned on in the
 429          * intel_crtc_mode_set since it has a large impact on the DPLL
 430          * settings.
 431          */
 432 }
 433
 434 /**
 435  * Detect the LVDS connection.
 436  *
 437  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 438  * connected and closed means disconnected.  We also send hotplug events as
 439  * needed, using lid status notification from the input layer.
 440  */
 441 static enum drm_connector_status
 442 intel_lvds_detect(struct drm_connector *connector, bool force)
 443 {
 444         struct drm_device *dev = connector->dev;
 445         enum drm_connector_status status;
 446
 447         status = intel_panel_detect(dev);
 448         if (status != connector_status_unknown)
 449                 return status;
 450
 451         return connector_status_connected;
 452 }
 453
 454 /**
 455  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 456  */
 457 static int intel_lvds_get_modes(struct drm_connector *connector)
 458 {
 459         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 460         struct drm_device *dev = connector->dev;
 461         struct drm_display_mode *mode;
 462
 463         if (lvds_connector->edid)
 464                 return drm_add_edid_modes(connector, lvds_connector->edid);
 465
 466         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 467         if (mode == NULL)
 468                 return 0;
 469
 470         drm_mode_probed_add(connector, mode);
 471         return 1;
 472 }
 473
 474 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 475 {
 476         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 477         return 1;
 478 }
 479
 480 /* The GPU hangs up on these systems if modeset is performed on LID open */
 481 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 482         {
 483                 .callback = intel_no_modeset_on_lid_dmi_callback,
 484                 .ident = "Toshiba Tecra A11",
 485                 .matches = {
 486                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 487                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 488                 },
 489         },
 490
 491         { }     /* terminating entry */
 492 };
 493
 494 /*
 495  * Lid events. Note the use of 'modeset_on_lid':
 496  *  - we set it on lid close, and reset it on open
 497  *  - we use it as a "only once" bit (ie we ignore
 498  *    duplicate events where it was already properly
 499  *    set/reset)
 500  *  - the suspend/resume paths will also set it to
 501  *    zero, since they restore the mode ("lid open").
 502  */
 503 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 504                             void *unused)
 505 {
 506         struct intel_lvds_connector *lvds_connector =
 507                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 508         struct drm_connector *connector = &lvds_connector->base.base;
 509         struct drm_device *dev = connector->dev;
 510         struct drm_i915_private *dev_priv = dev->dev_private;
 511
 512         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 513                 return NOTIFY_OK;
 514
 515         /*
 516          * check and update the status of LVDS connector after receiving
 517          * the LID nofication event.
 518          */
 519         connector->status = connector->funcs->detect(connector, false);
 520
 521         /* Don't force modeset on machines where it causes a GPU lockup */
 522         if (dmi_check_system(intel_no_modeset_on_lid))
 523                 return NOTIFY_OK;
 524         if (!acpi_lid_open()) {
 525                 dev_priv->modeset_on_lid = 1;
 526                 return NOTIFY_OK;
 527         }
 528
 529         if (!dev_priv->modeset_on_lid)
 530                 return NOTIFY_OK;
 531
 532         dev_priv->modeset_on_lid = 0;
 533
 534         mutex_lock(&dev->mode_config.mutex);
 535         intel_modeset_check_state(dev);
 536         mutex_unlock(&dev->mode_config.mutex);
 537
 538         return NOTIFY_OK;
 539 }
 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 (lvds_connector->lid_notifier.notifier_call)
 554                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 555
 556         intel_panel_destroy_backlight(connector->dev);
 557         intel_panel_fini(&lvds_connector->base.panel);
 558
 559         drm_sysfs_connector_remove(connector);
 560         drm_connector_cleanup(connector);
 561         kfree(connector);
 562 }
 563
 564 static int intel_lvds_set_property(struct drm_connector *connector,
 565                                    struct drm_property *property,
 566                                    uint64_t value)
 567 {
 568         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 569         struct drm_device *dev = connector->dev;
 570
 571         if (property == dev->mode_config.scaling_mode_property) {
 572                 struct drm_crtc *crtc;
 573
 574                 if (value == DRM_MODE_SCALE_NONE) {
 575                         DRM_DEBUG_KMS("no scaling not supported\n");
 576                         return -EINVAL;
 577                 }
 578
 579                 if (lvds_connector->fitting_mode == value) {
 580                         /* the LVDS scaling property is not changed */
 581                         return 0;
 582                 }
 583                 lvds_connector->fitting_mode = value;
 584
 585                 crtc = intel_attached_encoder(connector)->base.crtc;
 586                 if (crtc && crtc->enabled) {
 587                         /*
 588                          * If the CRTC is enabled, the display will be changed
 589                          * according to the new panel fitting mode.
 590                          */
 591                         intel_set_mode(crtc, &crtc->mode,
 592                                        crtc->x, crtc->y, crtc->fb);
 593                 }
 594         }
 595
 596         return 0;
 597 }
 598
 599 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 600         .mode_fixup = intel_lvds_mode_fixup,
 601         .mode_set = intel_lvds_mode_set,
 602         .disable = intel_encoder_noop,
 603 };
 604
 605 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 606         .get_modes = intel_lvds_get_modes,
 607         .mode_valid = intel_lvds_mode_valid,
 608         .best_encoder = intel_best_encoder,
 609 };
 610
 611 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 612         .dpms = intel_connector_dpms,
 613         .detect = intel_lvds_detect,
 614         .fill_modes = drm_helper_probe_single_connector_modes,
 615         .set_property = intel_lvds_set_property,
 616         .destroy = intel_lvds_destroy,
 617 };
 618
 619 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 620         .destroy = intel_encoder_destroy,
 621 };
 622
 623 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 624 {
 625         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 626         return 1;
 627 }
 628
 629 /* These systems claim to have LVDS, but really don't */
 630 static const struct dmi_system_id intel_no_lvds[] = {
 631         {
 632                 .callback = intel_no_lvds_dmi_callback,
 633                 .ident = "Apple Mac Mini (Core series)",
 634                 .matches = {
 635                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 636                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 637                 },
 638         },
 639         {
 640                 .callback = intel_no_lvds_dmi_callback,
 641                 .ident = "Apple Mac Mini (Core 2 series)",
 642                 .matches = {
 643                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 644                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 645                 },
 646         },
 647         {
 648                 .callback = intel_no_lvds_dmi_callback,
 649                 .ident = "MSI IM-945GSE-A",
 650                 .matches = {
 651                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 652                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 653                 },
 654         },
 655         {
 656                 .callback = intel_no_lvds_dmi_callback,
 657                 .ident = "Dell Studio Hybrid",
 658                 .matches = {
 659                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 660                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 661                 },
 662         },
 663         {
 664                 .callback = intel_no_lvds_dmi_callback,
 665                 .ident = "Dell OptiPlex FX170",
 666                 .matches = {
 667                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 668                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 669                 },
 670         },
 671         {
 672                 .callback = intel_no_lvds_dmi_callback,
 673                 .ident = "AOpen Mini PC",
 674                 .matches = {
 675                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 676                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 677                 },
 678         },
 679         {
 680                 .callback = intel_no_lvds_dmi_callback,
 681                 .ident = "AOpen Mini PC MP915",
 682                 .matches = {
 683                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 684                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 685                 },
 686         },
 687         {
 688                 .callback = intel_no_lvds_dmi_callback,
 689                 .ident = "AOpen i915GMm-HFS",
 690                 .matches = {
 691                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 692                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 693                 },
 694         },
 695         {
 696                 .callback = intel_no_lvds_dmi_callback,
 697                 .ident = "AOpen i45GMx-I",
 698                 .matches = {
 699                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 700                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 701                 },
 702         },
 703         {
 704                 .callback = intel_no_lvds_dmi_callback,
 705                 .ident = "Aopen i945GTt-VFA",
 706                 .matches = {
 707                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 708                 },
 709         },
 710         {
 711                 .callback = intel_no_lvds_dmi_callback,
 712                 .ident = "Clientron U800",
 713                 .matches = {
 714                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 715                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 716                 },
 717         },
 718         {
 719                 .callback = intel_no_lvds_dmi_callback,
 720                 .ident = "Clientron E830",
 721                 .matches = {
 722                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 723                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 724                 },
 725         },
 726         {
 727                 .callback = intel_no_lvds_dmi_callback,
 728                 .ident = "Asus EeeBox PC EB1007",
 729                 .matches = {
 730                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 731                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 732                 },
 733         },
 734         {
 735                 .callback = intel_no_lvds_dmi_callback,
 736                 .ident = "Asus AT5NM10T-I",
 737                 .matches = {
 738                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 739                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 740                 },
 741         },
 742         {
 743                 .callback = intel_no_lvds_dmi_callback,
 744                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 745                 .matches = {
 746                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 747                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 748                 },
 749         },
 750         {
 751                 .callback = intel_no_lvds_dmi_callback,
 752                 .ident = "Hewlett-Packard t5745",
 753                 .matches = {
 754                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 755                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 756                 },
 757         },
 758         {
 759                 .callback = intel_no_lvds_dmi_callback,
 760                 .ident = "Hewlett-Packard st5747",
 761                 .matches = {
 762                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 763                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 764                 },
 765         },
 766         {
 767                 .callback = intel_no_lvds_dmi_callback,
 768                 .ident = "MSI Wind Box DC500",
 769                 .matches = {
 770                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 771                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 772                 },
 773         },
 774         {
 775                 .callback = intel_no_lvds_dmi_callback,
 776                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
 777                 .matches = {
 778                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
 779                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
 780                 },
 781         },
 782         {
 783                 .callback = intel_no_lvds_dmi_callback,
 784                 .ident = "Gigabyte GA-D525TUD",
 785                 .matches = {
 786                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 787                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 788                 },
 789         },
 790
 791         { }     /* terminating entry */
 792 };
 793
 794 /**
 795  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 796  * @dev: drm device
 797  * @connector: LVDS connector
 798  *
 799  * Find the reduced downclock for LVDS in EDID.
 800  */
 801 static void intel_find_lvds_downclock(struct drm_device *dev,
 802                                       struct drm_display_mode *fixed_mode,
 803                                       struct drm_connector *connector)
 804 {
 805         struct drm_i915_private *dev_priv = dev->dev_private;
 806         struct drm_display_mode *scan;
 807         int temp_downclock;
 808
 809         temp_downclock = fixed_mode->clock;
 810         list_for_each_entry(scan, &connector->probed_modes, head) {
 811                 /*
 812                  * If one mode has the same resolution with the fixed_panel
 813                  * mode while they have the different refresh rate, it means
 814                  * that the reduced downclock is found for the LVDS. In such
 815                  * case we can set the different FPx0/1 to dynamically select
 816                  * between low and high frequency.
 817                  */
 818                 if (scan->hdisplay == fixed_mode->hdisplay &&
 819                     scan->hsync_start == fixed_mode->hsync_start &&
 820                     scan->hsync_end == fixed_mode->hsync_end &&
 821                     scan->htotal == fixed_mode->htotal &&
 822                     scan->vdisplay == fixed_mode->vdisplay &&
 823                     scan->vsync_start == fixed_mode->vsync_start &&
 824                     scan->vsync_end == fixed_mode->vsync_end &&
 825                     scan->vtotal == fixed_mode->vtotal) {
 826                         if (scan->clock < temp_downclock) {
 827                                 /*
 828                                  * The downclock is already found. But we
 829                                  * expect to find the lower downclock.
 830                                  */
 831                                 temp_downclock = scan->clock;
 832                         }
 833                 }
 834         }
 835         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 836                 /* We found the downclock for LVDS. */
 837                 dev_priv->lvds_downclock_avail = 1;
 838                 dev_priv->lvds_downclock = temp_downclock;
 839                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 840                               "Normal clock %dKhz, downclock %dKhz\n",
 841                               fixed_mode->clock, temp_downclock);
 842         }
 843 }
 844
 845 /*
 846  * Enumerate the child dev array parsed from VBT to check whether
 847  * the LVDS is present.
 848  * If it is present, return 1.
 849  * If it is not present, return false.
 850  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 851  */
 852 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 853                                    u8 *i2c_pin)
 854 {
 855         struct drm_i915_private *dev_priv = dev->dev_private;
 856         int i;
 857
 858         if (!dev_priv->child_dev_num)
 859                 return true;
 860
 861         for (i = 0; i < dev_priv->child_dev_num; i++) {
 862                 struct child_device_config *child = dev_priv->child_dev + i;
 863
 864                 /* If the device type is not LFP, continue.
 865                  * We have to check both the new identifiers as well as the
 866                  * old for compatibility with some BIOSes.
 867                  */
 868                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 869                     child->device_type != DEVICE_TYPE_LFP)
 870                         continue;
 871
 872                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 873                         *i2c_pin = child->i2c_pin;
 874
 875                 /* However, we cannot trust the BIOS writers to populate
 876                  * the VBT correctly.  Since LVDS requires additional
 877                  * information from AIM blocks, a non-zero addin offset is
 878                  * a good indicator that the LVDS is actually present.
 879                  */
 880                 if (child->addin_offset)
 881                         return true;
 882
 883                 /* But even then some BIOS writers perform some black magic
 884                  * and instantiate the device without reference to any
 885                  * additional data.  Trust that if the VBT was written into
 886                  * the OpRegion then they have validated the LVDS's existence.
 887                  */
 888                 if (dev_priv->opregion.vbt)
 889                         return true;
 890         }
 891
 892         return false;
 893 }
 894
 895 static bool intel_lvds_supported(struct drm_device *dev)
 896 {
 897         /* With the introduction of the PCH we gained a dedicated
 898          * LVDS presence pin, use it. */
 899         if (HAS_PCH_SPLIT(dev))
 900                 return true;
 901
 902         /* Otherwise LVDS was only attached to mobile products,
 903          * except for the inglorious 830gm */
 904         return IS_MOBILE(dev) && !IS_I830(dev);
 905 }
 906
 907 /**
 908  * intel_lvds_init - setup LVDS connectors on this device
 909  * @dev: drm device
 910  *
 911  * Create the connector, register the LVDS DDC bus, and try to figure out what
 912  * modes we can display on the LVDS panel (if present).
 913  */
 914 bool intel_lvds_init(struct drm_device *dev)
 915 {
 916         struct drm_i915_private *dev_priv = dev->dev_private;
 917         struct intel_lvds_encoder *lvds_encoder;
 918         struct intel_encoder *intel_encoder;
 919         struct intel_lvds_connector *lvds_connector;
 920         struct intel_connector *intel_connector;
 921         struct drm_connector *connector;
 922         struct drm_encoder *encoder;
 923         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 924         struct drm_display_mode *fixed_mode = NULL;
 925         struct drm_crtc *crtc;
 926         u32 lvds;
 927         int pipe;
 928         u8 pin;
 929
 930         if (!intel_lvds_supported(dev))
 931                 return false;
 932
 933         /* Skip init on machines we know falsely report LVDS */
 934         if (dmi_check_system(intel_no_lvds))
 935                 return false;
 936
 937         pin = GMBUS_PORT_PANEL;
 938         if (!lvds_is_present_in_vbt(dev, &pin)) {
 939                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 940                 return false;
 941         }
 942
 943         if (HAS_PCH_SPLIT(dev)) {
 944                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 945                         return false;
 946                 if (dev_priv->edp.support) {
 947                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 948                         return false;
 949                 }
 950         }
 951
 952         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 953         if (!lvds_encoder)
 954                 return false;
 955
 956         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 957         if (!lvds_connector) {
 958                 kfree(lvds_encoder);
 959                 return false;
 960         }
 961
 962         lvds_encoder->attached_connector = lvds_connector;
 963
 964         if (!HAS_PCH_SPLIT(dev)) {
 965                 lvds_encoder->pfit_control = I915_READ(PFIT_CONTROL);
 966         }
 967
 968         intel_encoder = &lvds_encoder->base;
 969         encoder = &intel_encoder->base;
 970         intel_connector = &lvds_connector->base;
 971         connector = &intel_connector->base;
 972         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 973                            DRM_MODE_CONNECTOR_LVDS);
 974
 975         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 976                          DRM_MODE_ENCODER_LVDS);
 977
 978         intel_encoder->enable = intel_enable_lvds;
 979         intel_encoder->disable = intel_disable_lvds;
 980         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 981         intel_connector->get_hw_state = intel_connector_get_hw_state;
 982
 983         intel_connector_attach_encoder(intel_connector, intel_encoder);
 984         intel_encoder->type = INTEL_OUTPUT_LVDS;
 985
 986         intel_encoder->cloneable = false;
 987         if (HAS_PCH_SPLIT(dev))
 988                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 989         else if (IS_GEN4(dev))
 990                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 991         else
 992                 intel_encoder->crtc_mask = (1 << 1);
 993
 994         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 995         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 996         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 997         connector->interlace_allowed = false;
 998         connector->doublescan_allowed = false;
 999
1000         /* create the scaling mode property */
1001         drm_mode_create_scaling_mode_property(dev);
1002         /*
1003          * the initial panel fitting mode will be FULL_SCREEN.
1004          */
1005
1006         drm_connector_attach_property(&intel_connector->base,
1007                                       dev->mode_config.scaling_mode_property,
1008                                       DRM_MODE_SCALE_ASPECT);
1009         lvds_connector->fitting_mode = DRM_MODE_SCALE_ASPECT;
1010         /*
1011          * LVDS discovery:
1012          * 1) check for EDID on DDC
1013          * 2) check for VBT data
1014          * 3) check to see if LVDS is already on
1015          *    if none of the above, no panel
1016          * 4) make sure lid is open
1017          *    if closed, act like it's not there for now
1018          */
1019
1020         /*
1021          * Attempt to get the fixed panel mode from DDC.  Assume that the
1022          * preferred mode is the right one.
1023          */
1024         lvds_connector->edid = drm_get_edid(connector,
1025                                             intel_gmbus_get_adapter(dev_priv, pin));
1026         if (lvds_connector->edid) {
1027                 if (drm_add_edid_modes(connector, lvds_connector->edid)) {
1028                         drm_mode_connector_update_edid_property(connector,
1029                                                                 lvds_connector->edid);
1030                 } else {
1031                         kfree(lvds_connector->edid);
1032                         lvds_connector->edid = NULL;
1033                 }
1034         }
1035         if (!lvds_connector->edid) {
1036                 /* Didn't get an EDID, so
1037                  * Set wide sync ranges so we get all modes
1038                  * handed to valid_mode for checking
1039                  */
1040                 connector->display_info.min_vfreq = 0;
1041                 connector->display_info.max_vfreq = 200;
1042                 connector->display_info.min_hfreq = 0;
1043                 connector->display_info.max_hfreq = 200;
1044         }
1045
1046         list_for_each_entry(scan, &connector->probed_modes, head) {
1047                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1048                         fixed_mode = drm_mode_duplicate(dev, scan);
1049                         intel_find_lvds_downclock(dev, fixed_mode, connector);
1050                         goto out;
1051                 }
1052         }
1053
1054         /* Failed to get EDID, what about VBT? */
1055         if (dev_priv->lfp_lvds_vbt_mode) {
1056                 fixed_mode = drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1057                 if (fixed_mode) {
1058                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1059                         goto out;
1060                 }
1061         }
1062
1063         /*
1064          * If we didn't get EDID, try checking if the panel is already turned
1065          * on.  If so, assume that whatever is currently programmed is the
1066          * correct mode.
1067          */
1068
1069         /* Ironlake: FIXME if still fail, not try pipe mode now */
1070         if (HAS_PCH_SPLIT(dev))
1071                 goto failed;
1072
1073         lvds = I915_READ(LVDS);
1074         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1075         crtc = intel_get_crtc_for_pipe(dev, pipe);
1076
1077         if (crtc && (lvds & LVDS_PORT_EN)) {
1078                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1079                 if (fixed_mode) {
1080                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1081                         goto out;
1082                 }
1083         }
1084
1085         /* If we still don't have a mode after all that, give up. */
1086         if (!fixed_mode)
1087                 goto failed;
1088
1089 out:
1090         /*
1091          * Unlock registers and just
1092          * leave them unlocked
1093          */
1094         if (HAS_PCH_SPLIT(dev)) {
1095                 I915_WRITE(PCH_PP_CONTROL,
1096                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1097         } else {
1098                 I915_WRITE(PP_CONTROL,
1099                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1100         }
1101         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1102         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1103                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1104                 lvds_connector->lid_notifier.notifier_call = NULL;
1105         }
1106         drm_sysfs_connector_add(connector);
1107
1108         intel_panel_init(&intel_connector->panel, fixed_mode);
1109         intel_panel_setup_backlight(connector);
1110
1111         return true;
1112
1113 failed:
1114         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1115         drm_connector_cleanup(connector);
1116         drm_encoder_cleanup(encoder);
1117         if (fixed_mode)
1118                 drm_mode_destroy(dev, fixed_mode);
1119         kfree(lvds_encoder);
1120         kfree(lvds_connector);
1121         return false;
1122 }