drivers/gpu/drm/i915/intel_lvds.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  */
  29
  30 #include <acpi/button.h>
  31 #include <linux/dmi.h>
  32 #include <linux/i2c.h>
  33 #include <linux/slab.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_crtc.h>
  36 #include <drm/drm_edid.h>
  37 #include "intel_drv.h"
  38 #include <drm/i915_drm.h>
  39 #include "i915_drv.h"
  40 #include <linux/acpi.h>
  41
  42 /* Private structure for the integrated LVDS support */
  43 struct intel_lvds_connector {
  44         struct intel_connector base;
  45
  46         struct notifier_block lid_notifier;
  47 };
  48
  49 struct intel_lvds_encoder {
  50         struct intel_encoder base;
  51
  52         u32 pfit_control;
  53         u32 pfit_pgm_ratios;
  54         bool pfit_dirty;
  55
  56         struct intel_lvds_connector *attached_connector;
  57 };
  58
  59 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  60 {
  61         return container_of(encoder, struct intel_lvds_encoder, base.base);
  62 }
  63
  64 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  65 {
  66         return container_of(connector, struct intel_lvds_connector, base.base);
  67 }
  68
  69 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  70                                     enum pipe *pipe)
  71 {
  72         struct drm_device *dev = encoder->base.dev;
  73         struct drm_i915_private *dev_priv = dev->dev_private;
  74         u32 lvds_reg, tmp;
  75
  76         if (HAS_PCH_SPLIT(dev)) {
  77                 lvds_reg = PCH_LVDS;
  78         } else {
  79                 lvds_reg = LVDS;
  80         }
  81
  82         tmp = I915_READ(lvds_reg);
  83
  84         if (!(tmp & LVDS_PORT_EN))
  85                 return false;
  86
  87         if (HAS_PCH_CPT(dev))
  88                 *pipe = PORT_TO_PIPE_CPT(tmp);
  89         else
  90                 *pipe = PORT_TO_PIPE(tmp);
  91
  92         return true;
  93 }
  94
  95 /**
  96  * Sets the power state for the panel.
  97  */
  98 static void intel_enable_lvds(struct intel_encoder *encoder)
  99 {
 100         struct drm_device *dev = encoder->base.dev;
 101         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 102         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 103         struct drm_i915_private *dev_priv = dev->dev_private;
 104         u32 ctl_reg, lvds_reg, stat_reg;
 105
 106         if (HAS_PCH_SPLIT(dev)) {
 107                 ctl_reg = PCH_PP_CONTROL;
 108                 lvds_reg = PCH_LVDS;
 109                 stat_reg = PCH_PP_STATUS;
 110         } else {
 111                 ctl_reg = PP_CONTROL;
 112                 lvds_reg = LVDS;
 113                 stat_reg = PP_STATUS;
 114         }
 115
 116         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
 117
 118         if (lvds_encoder->pfit_dirty) {
 119                 /*
 120                  * Enable automatic panel scaling so that non-native modes
 121                  * fill the screen.  The panel fitter should only be
 122                  * adjusted whilst the pipe is disabled, according to
 123                  * register description and PRM.
 124                  */
 125                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
 126                               lvds_encoder->pfit_control,
 127                               lvds_encoder->pfit_pgm_ratios);
 128
 129                 I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
 130                 I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
 131                 lvds_encoder->pfit_dirty = false;
 132         }
 133
 134         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 135         POSTING_READ(lvds_reg);
 136         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 137                 DRM_ERROR("timed out waiting for panel to power on\n");
 138
 139         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 140 }
 141
 142 static void intel_disable_lvds(struct intel_encoder *encoder)
 143 {
 144         struct drm_device *dev = encoder->base.dev;
 145         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 146         struct drm_i915_private *dev_priv = dev->dev_private;
 147         u32 ctl_reg, lvds_reg, stat_reg;
 148
 149         if (HAS_PCH_SPLIT(dev)) {
 150                 ctl_reg = PCH_PP_CONTROL;
 151                 lvds_reg = PCH_LVDS;
 152                 stat_reg = PCH_PP_STATUS;
 153         } else {
 154                 ctl_reg = PP_CONTROL;
 155                 lvds_reg = LVDS;
 156                 stat_reg = PP_STATUS;
 157         }
 158
 159         intel_panel_disable_backlight(dev);
 160
 161         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 162         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 163                 DRM_ERROR("timed out waiting for panel to power off\n");
 164
 165         if (lvds_encoder->pfit_control) {
 166                 I915_WRITE(PFIT_CONTROL, 0);
 167                 lvds_encoder->pfit_dirty = true;
 168         }
 169
 170         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 171         POSTING_READ(lvds_reg);
 172 }
 173
 174 static int intel_lvds_mode_valid(struct drm_connector *connector,
 175                                  struct drm_display_mode *mode)
 176 {
 177         struct intel_connector *intel_connector = to_intel_connector(connector);
 178         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 179
 180         if (mode->hdisplay > fixed_mode->hdisplay)
 181                 return MODE_PANEL;
 182         if (mode->vdisplay > fixed_mode->vdisplay)
 183                 return MODE_PANEL;
 184
 185         return MODE_OK;
 186 }
 187
 188 static void
 189 centre_horizontally(struct drm_display_mode *mode,
 190                     int width)
 191 {
 192         u32 border, sync_pos, blank_width, sync_width;
 193
 194         /* keep the hsync and hblank widths constant */
 195         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 196         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 197         sync_pos = (blank_width - sync_width + 1) / 2;
 198
 199         border = (mode->hdisplay - width + 1) / 2;
 200         border += border & 1; /* make the border even */
 201
 202         mode->crtc_hdisplay = width;
 203         mode->crtc_hblank_start = width + border;
 204         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 205
 206         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 207         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 208
 209         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 210 }
 211
 212 static void
 213 centre_vertically(struct drm_display_mode *mode,
 214                   int height)
 215 {
 216         u32 border, sync_pos, blank_width, sync_width;
 217
 218         /* keep the vsync and vblank widths constant */
 219         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 220         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 221         sync_pos = (blank_width - sync_width + 1) / 2;
 222
 223         border = (mode->vdisplay - height + 1) / 2;
 224
 225         mode->crtc_vdisplay = height;
 226         mode->crtc_vblank_start = height + border;
 227         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 228
 229         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 230         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 231
 232         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 233 }
 234
 235 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 236 {
 237         /*
 238          * Floating point operation is not supported. So the FACTOR
 239          * is defined, which can avoid the floating point computation
 240          * when calculating the panel ratio.
 241          */
 242 #define ACCURACY 12
 243 #define FACTOR (1 << ACCURACY)
 244         u32 ratio = source * FACTOR / target;
 245         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 246 }
 247
 248 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 249                                   const struct drm_display_mode *mode,
 250                                   struct drm_display_mode *adjusted_mode)
 251 {
 252         struct drm_device *dev = encoder->dev;
 253         struct drm_i915_private *dev_priv = dev->dev_private;
 254         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(encoder);
 255         struct intel_connector *intel_connector =
 256                 &lvds_encoder->attached_connector->base;
 257         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 258         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 259         int pipe;
 260
 261         /* Should never happen!! */
 262         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 263                 DRM_ERROR("Can't support LVDS on pipe A\n");
 264                 return false;
 265         }
 266
 267         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
 268                 return false;
 269
 270         /*
 271          * We have timings from the BIOS for the panel, put them in
 272          * to the adjusted mode.  The CRTC will be set up for this mode,
 273          * with the panel scaling set up to source from the H/VDisplay
 274          * of the original mode.
 275          */
 276         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 277                                adjusted_mode);
 278
 279         if (HAS_PCH_SPLIT(dev)) {
 280                 intel_pch_panel_fitting(dev,
 281                                         intel_connector->panel.fitting_mode,
 282                                         mode, adjusted_mode);
 283                 return true;
 284         }
 285
 286         /* Native modes don't need fitting */
 287         if (adjusted_mode->hdisplay == mode->hdisplay &&
 288             adjusted_mode->vdisplay == mode->vdisplay)
 289                 goto out;
 290
 291         /* 965+ wants fuzzy fitting */
 292         if (INTEL_INFO(dev)->gen >= 4)
 293                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 294                                  PFIT_FILTER_FUZZY);
 295
 296         /*
 297          * Enable automatic panel scaling for non-native modes so that they fill
 298          * the screen.  Should be enabled before the pipe is enabled, according
 299          * to register description and PRM.
 300          * Change the value here to see the borders for debugging
 301          */
 302         for_each_pipe(pipe)
 303                 I915_WRITE(BCLRPAT(pipe), 0);
 304
 305         drm_mode_set_crtcinfo(adjusted_mode, 0);
 306
 307         switch (intel_connector->panel.fitting_mode) {
 308         case DRM_MODE_SCALE_CENTER:
 309                 /*
 310                  * For centered modes, we have to calculate border widths &
 311                  * heights and modify the values programmed into the CRTC.
 312                  */
 313                 centre_horizontally(adjusted_mode, mode->hdisplay);
 314                 centre_vertically(adjusted_mode, mode->vdisplay);
 315                 border = LVDS_BORDER_ENABLE;
 316                 break;
 317
 318         case DRM_MODE_SCALE_ASPECT:
 319                 /* Scale but preserve the aspect ratio */
 320                 if (INTEL_INFO(dev)->gen >= 4) {
 321                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 322                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 323
 324                         /* 965+ is easy, it does everything in hw */
 325                         if (scaled_width > scaled_height)
 326                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 327                         else if (scaled_width < scaled_height)
 328                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 329                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 330                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 331                 } else {
 332                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 333                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 334                         /*
 335                          * For earlier chips we have to calculate the scaling
 336                          * ratio by hand and program it into the
 337                          * PFIT_PGM_RATIO register
 338                          */
 339                         if (scaled_width > scaled_height) { /* pillar */
 340                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 341
 342                                 border = LVDS_BORDER_ENABLE;
 343                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 344                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 345                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 346                                                             bits << PFIT_VERT_SCALE_SHIFT);
 347                                         pfit_control |= (PFIT_ENABLE |
 348                                                          VERT_INTERP_BILINEAR |
 349                                                          HORIZ_INTERP_BILINEAR);
 350                                 }
 351                         } else if (scaled_width < scaled_height) { /* letter */
 352                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 353
 354                                 border = LVDS_BORDER_ENABLE;
 355                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 356                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 357                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 358                                                             bits << PFIT_VERT_SCALE_SHIFT);
 359                                         pfit_control |= (PFIT_ENABLE |
 360                                                          VERT_INTERP_BILINEAR |
 361                                                          HORIZ_INTERP_BILINEAR);
 362                                 }
 363                         } else
 364                                 /* Aspects match, Let hw scale both directions */
 365                                 pfit_control |= (PFIT_ENABLE |
 366                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 367                                                  VERT_INTERP_BILINEAR |
 368                                                  HORIZ_INTERP_BILINEAR);
 369                 }
 370                 break;
 371
 372         case DRM_MODE_SCALE_FULLSCREEN:
 373                 /*
 374                  * Full scaling, even if it changes the aspect ratio.
 375                  * Fortunately this is all done for us in hw.
 376                  */
 377                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 378                     mode->hdisplay != adjusted_mode->hdisplay) {
 379                         pfit_control |= PFIT_ENABLE;
 380                         if (INTEL_INFO(dev)->gen >= 4)
 381                                 pfit_control |= PFIT_SCALING_AUTO;
 382                         else
 383                                 pfit_control |= (VERT_AUTO_SCALE |
 384                                                  VERT_INTERP_BILINEAR |
 385                                                  HORIZ_AUTO_SCALE |
 386                                                  HORIZ_INTERP_BILINEAR);
 387                 }
 388                 break;
 389
 390         default:
 391                 break;
 392         }
 393
 394 out:
 395         /* If not enabling scaling, be consistent and always use 0. */
 396         if ((pfit_control & PFIT_ENABLE) == 0) {
 397                 pfit_control = 0;
 398                 pfit_pgm_ratios = 0;
 399         }
 400
 401         /* Make sure pre-965 set dither correctly */
 402         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 403                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 404
 405         if (pfit_control != lvds_encoder->pfit_control ||
 406             pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
 407                 lvds_encoder->pfit_control = pfit_control;
 408                 lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
 409                 lvds_encoder->pfit_dirty = true;
 410         }
 411         dev_priv->lvds_border_bits = border;
 412
 413         /*
 414          * XXX: It would be nice to support lower refresh rates on the
 415          * panels to reduce power consumption, and perhaps match the
 416          * user's requested refresh rate.
 417          */
 418
 419         return true;
 420 }
 421
 422 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 423                                 struct drm_display_mode *mode,
 424                                 struct drm_display_mode *adjusted_mode)
 425 {
 426         /*
 427          * The LVDS pin pair will already have been turned on in the
 428          * intel_crtc_mode_set since it has a large impact on the DPLL
 429          * settings.
 430          */
 431 }
 432
 433 /**
 434  * Detect the LVDS connection.
 435  *
 436  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 437  * connected and closed means disconnected.  We also send hotplug events as
 438  * needed, using lid status notification from the input layer.
 439  */
 440 static enum drm_connector_status
 441 intel_lvds_detect(struct drm_connector *connector, bool force)
 442 {
 443         struct drm_device *dev = connector->dev;
 444         enum drm_connector_status status;
 445
 446         status = intel_panel_detect(dev);
 447         if (status != connector_status_unknown)
 448                 return status;
 449
 450         return connector_status_connected;
 451 }
 452
 453 /**
 454  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 455  */
 456 static int intel_lvds_get_modes(struct drm_connector *connector)
 457 {
 458         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 459         struct drm_device *dev = connector->dev;
 460         struct drm_display_mode *mode;
 461
 462         /* use cached edid if we have one */
 463         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 464                 return drm_add_edid_modes(connector, lvds_connector->base.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_setup_hw_state(dev, true);
 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         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 557                 kfree(lvds_connector->base.edid);
 558
 559         intel_panel_destroy_backlight(connector->dev);
 560         intel_panel_fini(&lvds_connector->base.panel);
 561
 562         drm_sysfs_connector_remove(connector);
 563         drm_connector_cleanup(connector);
 564         kfree(connector);
 565 }
 566
 567 static int intel_lvds_set_property(struct drm_connector *connector,
 568                                    struct drm_property *property,
 569                                    uint64_t value)
 570 {
 571         struct intel_connector *intel_connector = to_intel_connector(connector);
 572         struct drm_device *dev = connector->dev;
 573
 574         if (property == dev->mode_config.scaling_mode_property) {
 575                 struct drm_crtc *crtc;
 576
 577                 if (value == DRM_MODE_SCALE_NONE) {
 578                         DRM_DEBUG_KMS("no scaling not supported\n");
 579                         return -EINVAL;
 580                 }
 581
 582                 if (intel_connector->panel.fitting_mode == value) {
 583                         /* the LVDS scaling property is not changed */
 584                         return 0;
 585                 }
 586                 intel_connector->panel.fitting_mode = value;
 587
 588                 crtc = intel_attached_encoder(connector)->base.crtc;
 589                 if (crtc && crtc->enabled) {
 590                         /*
 591                          * If the CRTC is enabled, the display will be changed
 592                          * according to the new panel fitting mode.
 593                          */
 594                         intel_set_mode(crtc, &crtc->mode,
 595                                        crtc->x, crtc->y, crtc->fb);
 596                 }
 597         }
 598
 599         return 0;
 600 }
 601
 602 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 603         .mode_fixup = intel_lvds_mode_fixup,
 604         .mode_set = intel_lvds_mode_set,
 605         .disable = intel_encoder_noop,
 606 };
 607
 608 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 609         .get_modes = intel_lvds_get_modes,
 610         .mode_valid = intel_lvds_mode_valid,
 611         .best_encoder = intel_best_encoder,
 612 };
 613
 614 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 615         .dpms = intel_connector_dpms,
 616         .detect = intel_lvds_detect,
 617         .fill_modes = drm_helper_probe_single_connector_modes,
 618         .set_property = intel_lvds_set_property,
 619         .destroy = intel_lvds_destroy,
 620 };
 621
 622 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 623         .destroy = intel_encoder_destroy,
 624 };
 625
 626 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 627 {
 628         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 629         return 1;
 630 }
 631
 632 /* These systems claim to have LVDS, but really don't */
 633 static const struct dmi_system_id intel_no_lvds[] = {
 634         {
 635                 .callback = intel_no_lvds_dmi_callback,
 636                 .ident = "Apple Mac Mini (Core series)",
 637                 .matches = {
 638                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 639                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 640                 },
 641         },
 642         {
 643                 .callback = intel_no_lvds_dmi_callback,
 644                 .ident = "Apple Mac Mini (Core 2 series)",
 645                 .matches = {
 646                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 647                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 648                 },
 649         },
 650         {
 651                 .callback = intel_no_lvds_dmi_callback,
 652                 .ident = "MSI IM-945GSE-A",
 653                 .matches = {
 654                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 655                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 656                 },
 657         },
 658         {
 659                 .callback = intel_no_lvds_dmi_callback,
 660                 .ident = "Dell Studio Hybrid",
 661                 .matches = {
 662                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 663                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 664                 },
 665         },
 666         {
 667                 .callback = intel_no_lvds_dmi_callback,
 668                 .ident = "Dell OptiPlex FX170",
 669                 .matches = {
 670                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 671                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 672                 },
 673         },
 674         {
 675                 .callback = intel_no_lvds_dmi_callback,
 676                 .ident = "AOpen Mini PC",
 677                 .matches = {
 678                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 679                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 680                 },
 681         },
 682         {
 683                 .callback = intel_no_lvds_dmi_callback,
 684                 .ident = "AOpen Mini PC MP915",
 685                 .matches = {
 686                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 687                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 688                 },
 689         },
 690         {
 691                 .callback = intel_no_lvds_dmi_callback,
 692                 .ident = "AOpen i915GMm-HFS",
 693                 .matches = {
 694                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 695                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 696                 },
 697         },
 698         {
 699                 .callback = intel_no_lvds_dmi_callback,
 700                 .ident = "AOpen i45GMx-I",
 701                 .matches = {
 702                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 703                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 704                 },
 705         },
 706         {
 707                 .callback = intel_no_lvds_dmi_callback,
 708                 .ident = "Aopen i945GTt-VFA",
 709                 .matches = {
 710                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 711                 },
 712         },
 713         {
 714                 .callback = intel_no_lvds_dmi_callback,
 715                 .ident = "Clientron U800",
 716                 .matches = {
 717                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 718                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 719                 },
 720         },
 721         {
 722                 .callback = intel_no_lvds_dmi_callback,
 723                 .ident = "Clientron E830",
 724                 .matches = {
 725                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 726                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 727                 },
 728         },
 729         {
 730                 .callback = intel_no_lvds_dmi_callback,
 731                 .ident = "Asus EeeBox PC EB1007",
 732                 .matches = {
 733                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 734                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 735                 },
 736         },
 737         {
 738                 .callback = intel_no_lvds_dmi_callback,
 739                 .ident = "Asus AT5NM10T-I",
 740                 .matches = {
 741                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 742                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 743                 },
 744         },
 745         {
 746                 .callback = intel_no_lvds_dmi_callback,
 747                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 748                 .matches = {
 749                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 750                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 751                 },
 752         },
 753         {
 754                 .callback = intel_no_lvds_dmi_callback,
 755                 .ident = "Hewlett-Packard t5745",
 756                 .matches = {
 757                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 758                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 759                 },
 760         },
 761         {
 762                 .callback = intel_no_lvds_dmi_callback,
 763                 .ident = "Hewlett-Packard st5747",
 764                 .matches = {
 765                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 766                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 767                 },
 768         },
 769         {
 770                 .callback = intel_no_lvds_dmi_callback,
 771                 .ident = "MSI Wind Box DC500",
 772                 .matches = {
 773                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 774                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 775                 },
 776         },
 777         {
 778                 .callback = intel_no_lvds_dmi_callback,
 779                 .ident = "Gigabyte GA-D525TUD",
 780                 .matches = {
 781                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 782                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 783                 },
 784         },
 785         {
 786                 .callback = intel_no_lvds_dmi_callback,
 787                 .ident = "Supermicro X7SPA-H",
 788                 .matches = {
 789                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 790                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 791                 },
 792         },
 793
 794         { }     /* terminating entry */
 795 };
 796
 797 /**
 798  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 799  * @dev: drm device
 800  * @connector: LVDS connector
 801  *
 802  * Find the reduced downclock for LVDS in EDID.
 803  */
 804 static void intel_find_lvds_downclock(struct drm_device *dev,
 805                                       struct drm_display_mode *fixed_mode,
 806                                       struct drm_connector *connector)
 807 {
 808         struct drm_i915_private *dev_priv = dev->dev_private;
 809         struct drm_display_mode *scan;
 810         int temp_downclock;
 811
 812         temp_downclock = fixed_mode->clock;
 813         list_for_each_entry(scan, &connector->probed_modes, head) {
 814                 /*
 815                  * If one mode has the same resolution with the fixed_panel
 816                  * mode while they have the different refresh rate, it means
 817                  * that the reduced downclock is found for the LVDS. In such
 818                  * case we can set the different FPx0/1 to dynamically select
 819                  * between low and high frequency.
 820                  */
 821                 if (scan->hdisplay == fixed_mode->hdisplay &&
 822                     scan->hsync_start == fixed_mode->hsync_start &&
 823                     scan->hsync_end == fixed_mode->hsync_end &&
 824                     scan->htotal == fixed_mode->htotal &&
 825                     scan->vdisplay == fixed_mode->vdisplay &&
 826                     scan->vsync_start == fixed_mode->vsync_start &&
 827                     scan->vsync_end == fixed_mode->vsync_end &&
 828                     scan->vtotal == fixed_mode->vtotal) {
 829                         if (scan->clock < temp_downclock) {
 830                                 /*
 831                                  * The downclock is already found. But we
 832                                  * expect to find the lower downclock.
 833                                  */
 834                                 temp_downclock = scan->clock;
 835                         }
 836                 }
 837         }
 838         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 839                 /* We found the downclock for LVDS. */
 840                 dev_priv->lvds_downclock_avail = 1;
 841                 dev_priv->lvds_downclock = temp_downclock;
 842                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 843                               "Normal clock %dKhz, downclock %dKhz\n",
 844                               fixed_mode->clock, temp_downclock);
 845         }
 846 }
 847
 848 /*
 849  * Enumerate the child dev array parsed from VBT to check whether
 850  * the LVDS is present.
 851  * If it is present, return 1.
 852  * If it is not present, return false.
 853  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 854  */
 855 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 856                                    u8 *i2c_pin)
 857 {
 858         struct drm_i915_private *dev_priv = dev->dev_private;
 859         int i;
 860
 861         if (!dev_priv->child_dev_num)
 862                 return true;
 863
 864         for (i = 0; i < dev_priv->child_dev_num; i++) {
 865                 struct child_device_config *child = dev_priv->child_dev + i;
 866
 867                 /* If the device type is not LFP, continue.
 868                  * We have to check both the new identifiers as well as the
 869                  * old for compatibility with some BIOSes.
 870                  */
 871                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 872                     child->device_type != DEVICE_TYPE_LFP)
 873                         continue;
 874
 875                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 876                         *i2c_pin = child->i2c_pin;
 877
 878                 /* However, we cannot trust the BIOS writers to populate
 879                  * the VBT correctly.  Since LVDS requires additional
 880                  * information from AIM blocks, a non-zero addin offset is
 881                  * a good indicator that the LVDS is actually present.
 882                  */
 883                 if (child->addin_offset)
 884                         return true;
 885
 886                 /* But even then some BIOS writers perform some black magic
 887                  * and instantiate the device without reference to any
 888                  * additional data.  Trust that if the VBT was written into
 889                  * the OpRegion then they have validated the LVDS's existence.
 890                  */
 891                 if (dev_priv->opregion.vbt)
 892                         return true;
 893         }
 894
 895         return false;
 896 }
 897
 898 static bool intel_lvds_supported(struct drm_device *dev)
 899 {
 900         /* With the introduction of the PCH we gained a dedicated
 901          * LVDS presence pin, use it. */
 902         if (HAS_PCH_SPLIT(dev))
 903                 return true;
 904
 905         /* Otherwise LVDS was only attached to mobile products,
 906          * except for the inglorious 830gm */
 907         return IS_MOBILE(dev) && !IS_I830(dev);
 908 }
 909
 910 /**
 911  * intel_lvds_init - setup LVDS connectors on this device
 912  * @dev: drm device
 913  *
 914  * Create the connector, register the LVDS DDC bus, and try to figure out what
 915  * modes we can display on the LVDS panel (if present).
 916  */
 917 bool intel_lvds_init(struct drm_device *dev)
 918 {
 919         struct drm_i915_private *dev_priv = dev->dev_private;
 920         struct intel_lvds_encoder *lvds_encoder;
 921         struct intel_encoder *intel_encoder;
 922         struct intel_lvds_connector *lvds_connector;
 923         struct intel_connector *intel_connector;
 924         struct drm_connector *connector;
 925         struct drm_encoder *encoder;
 926         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 927         struct drm_display_mode *fixed_mode = NULL;
 928         struct edid *edid;
 929         struct drm_crtc *crtc;
 930         u32 lvds;
 931         int pipe;
 932         u8 pin;
 933
 934         if (!intel_lvds_supported(dev))
 935                 return false;
 936
 937         /* Skip init on machines we know falsely report LVDS */
 938         if (dmi_check_system(intel_no_lvds))
 939                 return false;
 940
 941         pin = GMBUS_PORT_PANEL;
 942         if (!lvds_is_present_in_vbt(dev, &pin)) {
 943                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 944                 return false;
 945         }
 946
 947         if (HAS_PCH_SPLIT(dev)) {
 948                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 949                         return false;
 950                 if (dev_priv->edp.support) {
 951                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 952                         return false;
 953                 }
 954         }
 955
 956         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 957         if (!lvds_encoder)
 958                 return false;
 959
 960         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 961         if (!lvds_connector) {
 962                 kfree(lvds_encoder);
 963                 return false;
 964         }
 965
 966         lvds_encoder->attached_connector = lvds_connector;
 967
 968         if (!HAS_PCH_SPLIT(dev)) {
 969                 lvds_encoder->pfit_control = I915_READ(PFIT_CONTROL);
 970         }
 971
 972         intel_encoder = &lvds_encoder->base;
 973         encoder = &intel_encoder->base;
 974         intel_connector = &lvds_connector->base;
 975         connector = &intel_connector->base;
 976         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 977                            DRM_MODE_CONNECTOR_LVDS);
 978
 979         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 980                          DRM_MODE_ENCODER_LVDS);
 981
 982         intel_encoder->enable = intel_enable_lvds;
 983         intel_encoder->disable = intel_disable_lvds;
 984         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 985         intel_connector->get_hw_state = intel_connector_get_hw_state;
 986
 987         intel_connector_attach_encoder(intel_connector, intel_encoder);
 988         intel_encoder->type = INTEL_OUTPUT_LVDS;
 989
 990         intel_encoder->cloneable = false;
 991         if (HAS_PCH_SPLIT(dev))
 992                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 993         else if (IS_GEN4(dev))
 994                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 995         else
 996                 intel_encoder->crtc_mask = (1 << 1);
 997
 998         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 999         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
1000         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1001         connector->interlace_allowed = false;
1002         connector->doublescan_allowed = false;
1003
1004         /* create the scaling mode property */
1005         drm_mode_create_scaling_mode_property(dev);
1006         drm_object_attach_property(&connector->base,
1007                                       dev->mode_config.scaling_mode_property,
1008                                       DRM_MODE_SCALE_ASPECT);
1009         intel_connector->panel.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         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1025         if (edid) {
1026                 if (drm_add_edid_modes(connector, edid)) {
1027                         drm_mode_connector_update_edid_property(connector,
1028                                                                 edid);
1029                 } else {
1030                         kfree(edid);
1031                         edid = ERR_PTR(-EINVAL);
1032                 }
1033         } else {
1034                 edid = ERR_PTR(-ENOENT);
1035         }
1036         lvds_connector->base.edid = edid;
1037
1038         if (IS_ERR_OR_NULL(edid)) {
1039                 /* Didn't get an EDID, so
1040                  * Set wide sync ranges so we get all modes
1041                  * handed to valid_mode for checking
1042                  */
1043                 connector->display_info.min_vfreq = 0;
1044                 connector->display_info.max_vfreq = 200;
1045                 connector->display_info.min_hfreq = 0;
1046                 connector->display_info.max_hfreq = 200;
1047         }
1048
1049         list_for_each_entry(scan, &connector->probed_modes, head) {
1050                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1051                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1052                         drm_mode_debug_printmodeline(scan);
1053
1054                         fixed_mode = drm_mode_duplicate(dev, scan);
1055                         if (fixed_mode) {
1056                                 intel_find_lvds_downclock(dev, fixed_mode,
1057                                                           connector);
1058                                 goto out;
1059                         }
1060                 }
1061         }
1062
1063         /* Failed to get EDID, what about VBT? */
1064         if (dev_priv->lfp_lvds_vbt_mode) {
1065                 DRM_DEBUG_KMS("using mode from VBT: ");
1066                 drm_mode_debug_printmodeline(dev_priv->lfp_lvds_vbt_mode);
1067
1068                 fixed_mode = drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1069                 if (fixed_mode) {
1070                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1071                         goto out;
1072                 }
1073         }
1074
1075         /*
1076          * If we didn't get EDID, try checking if the panel is already turned
1077          * on.  If so, assume that whatever is currently programmed is the
1078          * correct mode.
1079          */
1080
1081         /* Ironlake: FIXME if still fail, not try pipe mode now */
1082         if (HAS_PCH_SPLIT(dev))
1083                 goto failed;
1084
1085         lvds = I915_READ(LVDS);
1086         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1087         crtc = intel_get_crtc_for_pipe(dev, pipe);
1088
1089         if (crtc && (lvds & LVDS_PORT_EN)) {
1090                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1091                 if (fixed_mode) {
1092                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1093                         drm_mode_debug_printmodeline(fixed_mode);
1094                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1095                         goto out;
1096                 }
1097         }
1098
1099         /* If we still don't have a mode after all that, give up. */
1100         if (!fixed_mode)
1101                 goto failed;
1102
1103 out:
1104         /*
1105          * Unlock registers and just
1106          * leave them unlocked
1107          */
1108         if (HAS_PCH_SPLIT(dev)) {
1109                 I915_WRITE(PCH_PP_CONTROL,
1110                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1111         } else {
1112                 I915_WRITE(PP_CONTROL,
1113                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1114         }
1115         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1116         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1117                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1118                 lvds_connector->lid_notifier.notifier_call = NULL;
1119         }
1120         drm_sysfs_connector_add(connector);
1121
1122         intel_panel_init(&intel_connector->panel, fixed_mode);
1123         intel_panel_setup_backlight(connector);
1124
1125         return true;
1126
1127 failed:
1128         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1129         drm_connector_cleanup(connector);
1130         drm_encoder_cleanup(encoder);
1131         if (fixed_mode)
1132                 drm_mode_destroy(dev, fixed_mode);
1133         kfree(lvds_encoder);
1134         kfree(lvds_connector);
1135         return false;
1136 }