Pileus Git - ~andy/linux/blob - 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 "drmP.h"
  35 #include "drm.h"
  36 #include "drm_crtc.h"
  37 #include "drm_edid.h"
  38 #include "intel_drv.h"
  39 #include "i915_drm.h"
  40 #include "i915_drv.h"
  41 #include <linux/acpi.h>
  42
  43 /* Private structure for the integrated LVDS support */
  44 struct intel_lvds {
  45         struct intel_encoder base;
  46
  47         struct edid *edid;
  48
  49         int fitting_mode;
  50         u32 pfit_control;
  51         u32 pfit_pgm_ratios;
  52         bool pfit_dirty;
  53
  54         struct drm_display_mode *fixed_mode;
  55 };
  56
  57 static struct intel_lvds *to_intel_lvds(struct drm_encoder *encoder)
  58 {
  59         return container_of(encoder, struct intel_lvds, base.base);
  60 }
  61
  62 static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
  63 {
  64         return container_of(intel_attached_encoder(connector),
  65                             struct intel_lvds, base);
  66 }
  67
  68 /**
  69  * Sets the power state for the panel.
  70  */
  71 static void intel_lvds_enable(struct intel_lvds *intel_lvds)
  72 {
  73         struct drm_device *dev = intel_lvds->base.base.dev;
  74         struct intel_crtc *intel_crtc = to_intel_crtc(intel_lvds->base.base.crtc);
  75         struct drm_i915_private *dev_priv = dev->dev_private;
  76         u32 ctl_reg, lvds_reg, stat_reg;
  77
  78         if (HAS_PCH_SPLIT(dev)) {
  79                 ctl_reg = PCH_PP_CONTROL;
  80                 lvds_reg = PCH_LVDS;
  81                 stat_reg = PCH_PP_STATUS;
  82         } else {
  83                 ctl_reg = PP_CONTROL;
  84                 lvds_reg = LVDS;
  85                 stat_reg = PP_STATUS;
  86         }
  87
  88         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
  89
  90         if (intel_lvds->pfit_dirty) {
  91                 /*
  92                  * Enable automatic panel scaling so that non-native modes
  93                  * fill the screen.  The panel fitter should only be
  94                  * adjusted whilst the pipe is disabled, according to
  95                  * register description and PRM.
  96                  */
  97                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
  98                               intel_lvds->pfit_control,
  99                               intel_lvds->pfit_pgm_ratios);
 100
 101                 I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
 102                 I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
 103                 intel_lvds->pfit_dirty = false;
 104         }
 105
 106         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 107         POSTING_READ(lvds_reg);
 108         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 109                 DRM_ERROR("timed out waiting for panel to power on\n");
 110
 111         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 112 }
 113
 114 static void intel_lvds_disable(struct intel_lvds *intel_lvds)
 115 {
 116         struct drm_device *dev = intel_lvds->base.base.dev;
 117         struct drm_i915_private *dev_priv = dev->dev_private;
 118         u32 ctl_reg, lvds_reg, stat_reg;
 119
 120         if (HAS_PCH_SPLIT(dev)) {
 121                 ctl_reg = PCH_PP_CONTROL;
 122                 lvds_reg = PCH_LVDS;
 123                 stat_reg = PCH_PP_STATUS;
 124         } else {
 125                 ctl_reg = PP_CONTROL;
 126                 lvds_reg = LVDS;
 127                 stat_reg = PP_STATUS;
 128         }
 129
 130         intel_panel_disable_backlight(dev);
 131
 132         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 133         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 134                 DRM_ERROR("timed out waiting for panel to power off\n");
 135
 136         if (intel_lvds->pfit_control) {
 137                 I915_WRITE(PFIT_CONTROL, 0);
 138                 intel_lvds->pfit_dirty = true;
 139         }
 140
 141         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 142         POSTING_READ(lvds_reg);
 143 }
 144
 145 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
 146 {
 147         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 148
 149         if (mode == DRM_MODE_DPMS_ON)
 150                 intel_lvds_enable(intel_lvds);
 151         else
 152                 intel_lvds_disable(intel_lvds);
 153
 154         /* XXX: We never power down the LVDS pairs. */
 155 }
 156
 157 static int intel_lvds_mode_valid(struct drm_connector *connector,
 158                                  struct drm_display_mode *mode)
 159 {
 160         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 161         struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
 162
 163         if (mode->hdisplay > fixed_mode->hdisplay)
 164                 return MODE_PANEL;
 165         if (mode->vdisplay > fixed_mode->vdisplay)
 166                 return MODE_PANEL;
 167
 168         return MODE_OK;
 169 }
 170
 171 static void
 172 centre_horizontally(struct drm_display_mode *mode,
 173                     int width)
 174 {
 175         u32 border, sync_pos, blank_width, sync_width;
 176
 177         /* keep the hsync and hblank widths constant */
 178         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 179         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 180         sync_pos = (blank_width - sync_width + 1) / 2;
 181
 182         border = (mode->hdisplay - width + 1) / 2;
 183         border += border & 1; /* make the border even */
 184
 185         mode->crtc_hdisplay = width;
 186         mode->crtc_hblank_start = width + border;
 187         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 188
 189         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 190         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 191
 192         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 193 }
 194
 195 static void
 196 centre_vertically(struct drm_display_mode *mode,
 197                   int height)
 198 {
 199         u32 border, sync_pos, blank_width, sync_width;
 200
 201         /* keep the vsync and vblank widths constant */
 202         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 203         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 204         sync_pos = (blank_width - sync_width + 1) / 2;
 205
 206         border = (mode->vdisplay - height + 1) / 2;
 207
 208         mode->crtc_vdisplay = height;
 209         mode->crtc_vblank_start = height + border;
 210         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 211
 212         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 213         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 214
 215         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 216 }
 217
 218 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 219 {
 220         /*
 221          * Floating point operation is not supported. So the FACTOR
 222          * is defined, which can avoid the floating point computation
 223          * when calculating the panel ratio.
 224          */
 225 #define ACCURACY 12
 226 #define FACTOR (1 << ACCURACY)
 227         u32 ratio = source * FACTOR / target;
 228         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 229 }
 230
 231 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 232                                   const struct drm_display_mode *mode,
 233                                   struct drm_display_mode *adjusted_mode)
 234 {
 235         struct drm_device *dev = encoder->dev;
 236         struct drm_i915_private *dev_priv = dev->dev_private;
 237         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 238         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 239         struct intel_encoder *tmp_encoder;
 240         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 241         int pipe;
 242
 243         /* Should never happen!! */
 244         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 245                 DRM_ERROR("Can't support LVDS on pipe A\n");
 246                 return false;
 247         }
 248
 249         /* Should never happen!! */
 250         for_each_encoder_on_crtc(dev, encoder->crtc, tmp_encoder) {
 251                 if (&tmp_encoder->base != encoder) {
 252                         DRM_ERROR("Can't enable LVDS and another "
 253                                "encoder on the same pipe\n");
 254                         return false;
 255                 }
 256         }
 257
 258         /*
 259          * We have timings from the BIOS for the panel, put them in
 260          * to the adjusted mode.  The CRTC will be set up for this mode,
 261          * with the panel scaling set up to source from the H/VDisplay
 262          * of the original mode.
 263          */
 264         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
 265
 266         if (HAS_PCH_SPLIT(dev)) {
 267                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
 268                                         mode, adjusted_mode);
 269                 return true;
 270         }
 271
 272         /* Native modes don't need fitting */
 273         if (adjusted_mode->hdisplay == mode->hdisplay &&
 274             adjusted_mode->vdisplay == mode->vdisplay)
 275                 goto out;
 276
 277         /* 965+ wants fuzzy fitting */
 278         if (INTEL_INFO(dev)->gen >= 4)
 279                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 280                                  PFIT_FILTER_FUZZY);
 281
 282         /*
 283          * Enable automatic panel scaling for non-native modes so that they fill
 284          * the screen.  Should be enabled before the pipe is enabled, according
 285          * to register description and PRM.
 286          * Change the value here to see the borders for debugging
 287          */
 288         for_each_pipe(pipe)
 289                 I915_WRITE(BCLRPAT(pipe), 0);
 290
 291         drm_mode_set_crtcinfo(adjusted_mode, 0);
 292
 293         switch (intel_lvds->fitting_mode) {
 294         case DRM_MODE_SCALE_CENTER:
 295                 /*
 296                  * For centered modes, we have to calculate border widths &
 297                  * heights and modify the values programmed into the CRTC.
 298                  */
 299                 centre_horizontally(adjusted_mode, mode->hdisplay);
 300                 centre_vertically(adjusted_mode, mode->vdisplay);
 301                 border = LVDS_BORDER_ENABLE;
 302                 break;
 303
 304         case DRM_MODE_SCALE_ASPECT:
 305                 /* Scale but preserve the aspect ratio */
 306                 if (INTEL_INFO(dev)->gen >= 4) {
 307                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 308                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 309
 310                         /* 965+ is easy, it does everything in hw */
 311                         if (scaled_width > scaled_height)
 312                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 313                         else if (scaled_width < scaled_height)
 314                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 315                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 316                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 317                 } else {
 318                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 319                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 320                         /*
 321                          * For earlier chips we have to calculate the scaling
 322                          * ratio by hand and program it into the
 323                          * PFIT_PGM_RATIO register
 324                          */
 325                         if (scaled_width > scaled_height) { /* pillar */
 326                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 327
 328                                 border = LVDS_BORDER_ENABLE;
 329                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 330                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 331                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 332                                                             bits << PFIT_VERT_SCALE_SHIFT);
 333                                         pfit_control |= (PFIT_ENABLE |
 334                                                          VERT_INTERP_BILINEAR |
 335                                                          HORIZ_INTERP_BILINEAR);
 336                                 }
 337                         } else if (scaled_width < scaled_height) { /* letter */
 338                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 339
 340                                 border = LVDS_BORDER_ENABLE;
 341                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 342                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 343                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 344                                                             bits << PFIT_VERT_SCALE_SHIFT);
 345                                         pfit_control |= (PFIT_ENABLE |
 346                                                          VERT_INTERP_BILINEAR |
 347                                                          HORIZ_INTERP_BILINEAR);
 348                                 }
 349                         } else
 350                                 /* Aspects match, Let hw scale both directions */
 351                                 pfit_control |= (PFIT_ENABLE |
 352                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 353                                                  VERT_INTERP_BILINEAR |
 354                                                  HORIZ_INTERP_BILINEAR);
 355                 }
 356                 break;
 357
 358         case DRM_MODE_SCALE_FULLSCREEN:
 359                 /*
 360                  * Full scaling, even if it changes the aspect ratio.
 361                  * Fortunately this is all done for us in hw.
 362                  */
 363                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 364                     mode->hdisplay != adjusted_mode->hdisplay) {
 365                         pfit_control |= PFIT_ENABLE;
 366                         if (INTEL_INFO(dev)->gen >= 4)
 367                                 pfit_control |= PFIT_SCALING_AUTO;
 368                         else
 369                                 pfit_control |= (VERT_AUTO_SCALE |
 370                                                  VERT_INTERP_BILINEAR |
 371                                                  HORIZ_AUTO_SCALE |
 372                                                  HORIZ_INTERP_BILINEAR);
 373                 }
 374                 break;
 375
 376         default:
 377                 break;
 378         }
 379
 380 out:
 381         /* If not enabling scaling, be consistent and always use 0. */
 382         if ((pfit_control & PFIT_ENABLE) == 0) {
 383                 pfit_control = 0;
 384                 pfit_pgm_ratios = 0;
 385         }
 386
 387         /* Make sure pre-965 set dither correctly */
 388         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 389                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 390
 391         if (pfit_control != intel_lvds->pfit_control ||
 392             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
 393                 intel_lvds->pfit_control = pfit_control;
 394                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
 395                 intel_lvds->pfit_dirty = true;
 396         }
 397         dev_priv->lvds_border_bits = border;
 398
 399         /*
 400          * XXX: It would be nice to support lower refresh rates on the
 401          * panels to reduce power consumption, and perhaps match the
 402          * user's requested refresh rate.
 403          */
 404
 405         return true;
 406 }
 407
 408 static void intel_lvds_prepare(struct drm_encoder *encoder)
 409 {
 410         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 411
 412         intel_lvds_disable(intel_lvds);
 413 }
 414
 415 static void intel_lvds_commit(struct drm_encoder *encoder)
 416 {
 417         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 418
 419         /* Always do a full power on as we do not know what state
 420          * we were left in.
 421          */
 422         intel_lvds_enable(intel_lvds);
 423 }
 424
 425 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 426                                 struct drm_display_mode *mode,
 427                                 struct drm_display_mode *adjusted_mode)
 428 {
 429         /*
 430          * The LVDS pin pair will already have been turned on in the
 431          * intel_crtc_mode_set since it has a large impact on the DPLL
 432          * settings.
 433          */
 434 }
 435
 436 /**
 437  * Detect the LVDS connection.
 438  *
 439  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 440  * connected and closed means disconnected.  We also send hotplug events as
 441  * needed, using lid status notification from the input layer.
 442  */
 443 static enum drm_connector_status
 444 intel_lvds_detect(struct drm_connector *connector, bool force)
 445 {
 446         struct drm_device *dev = connector->dev;
 447         enum drm_connector_status status;
 448
 449         status = intel_panel_detect(dev);
 450         if (status != connector_status_unknown)
 451                 return status;
 452
 453         return connector_status_connected;
 454 }
 455
 456 /**
 457  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 458  */
 459 static int intel_lvds_get_modes(struct drm_connector *connector)
 460 {
 461         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 462         struct drm_device *dev = connector->dev;
 463         struct drm_display_mode *mode;
 464
 465         if (intel_lvds->edid)
 466                 return drm_add_edid_modes(connector, intel_lvds->edid);
 467
 468         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
 469         if (mode == NULL)
 470                 return 0;
 471
 472         drm_mode_probed_add(connector, mode);
 473         return 1;
 474 }
 475
 476 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 477 {
 478         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 479         return 1;
 480 }
 481
 482 /* The GPU hangs up on these systems if modeset is performed on LID open */
 483 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 484         {
 485                 .callback = intel_no_modeset_on_lid_dmi_callback,
 486                 .ident = "Toshiba Tecra A11",
 487                 .matches = {
 488                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 489                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 490                 },
 491         },
 492
 493         { }     /* terminating entry */
 494 };
 495
 496 /*
 497  * Lid events. Note the use of 'modeset_on_lid':
 498  *  - we set it on lid close, and reset it on open
 499  *  - we use it as a "only once" bit (ie we ignore
 500  *    duplicate events where it was already properly
 501  *    set/reset)
 502  *  - the suspend/resume paths will also set it to
 503  *    zero, since they restore the mode ("lid open").
 504  */
 505 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 506                             void *unused)
 507 {
 508         struct drm_i915_private *dev_priv =
 509                 container_of(nb, struct drm_i915_private, lid_notifier);
 510         struct drm_device *dev = dev_priv->dev;
 511         struct drm_connector *connector = dev_priv->int_lvds_connector;
 512
 513         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 514                 return NOTIFY_OK;
 515
 516         /*
 517          * check and update the status of LVDS connector after receiving
 518          * the LID nofication event.
 519          */
 520         if (connector)
 521                 connector->status = connector->funcs->detect(connector,
 522                                                              false);
 523
 524         /* Don't force modeset on machines where it causes a GPU lockup */
 525         if (dmi_check_system(intel_no_modeset_on_lid))
 526                 return NOTIFY_OK;
 527         if (!acpi_lid_open()) {
 528                 dev_priv->modeset_on_lid = 1;
 529                 return NOTIFY_OK;
 530         }
 531
 532         if (!dev_priv->modeset_on_lid)
 533                 return NOTIFY_OK;
 534
 535         dev_priv->modeset_on_lid = 0;
 536
 537         mutex_lock(&dev->mode_config.mutex);
 538         drm_helper_resume_force_mode(dev);
 539         mutex_unlock(&dev->mode_config.mutex);
 540
 541         return NOTIFY_OK;
 542 }
 543
 544 /**
 545  * intel_lvds_destroy - unregister and free LVDS structures
 546  * @connector: connector to free
 547  *
 548  * Unregister the DDC bus for this connector then free the driver private
 549  * structure.
 550  */
 551 static void intel_lvds_destroy(struct drm_connector *connector)
 552 {
 553         struct drm_device *dev = connector->dev;
 554         struct drm_i915_private *dev_priv = dev->dev_private;
 555
 556         intel_panel_destroy_backlight(dev);
 557
 558         if (dev_priv->lid_notifier.notifier_call)
 559                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 560         drm_sysfs_connector_remove(connector);
 561         drm_connector_cleanup(connector);
 562         kfree(connector);
 563 }
 564
 565 static int intel_lvds_set_property(struct drm_connector *connector,
 566                                    struct drm_property *property,
 567                                    uint64_t value)
 568 {
 569         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 570         struct drm_device *dev = connector->dev;
 571
 572         if (property == dev->mode_config.scaling_mode_property) {
 573                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
 574
 575                 if (value == DRM_MODE_SCALE_NONE) {
 576                         DRM_DEBUG_KMS("no scaling not supported\n");
 577                         return -EINVAL;
 578                 }
 579
 580                 if (intel_lvds->fitting_mode == value) {
 581                         /* the LVDS scaling property is not changed */
 582                         return 0;
 583                 }
 584                 intel_lvds->fitting_mode = value;
 585                 if (crtc && crtc->enabled) {
 586                         /*
 587                          * If the CRTC is enabled, the display will be changed
 588                          * according to the new panel fitting mode.
 589                          */
 590                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
 591                                 crtc->x, crtc->y, crtc->fb);
 592                 }
 593         }
 594
 595         return 0;
 596 }
 597
 598 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 599         .dpms = intel_lvds_dpms,
 600         .mode_fixup = intel_lvds_mode_fixup,
 601         .prepare = intel_lvds_prepare,
 602         .mode_set = intel_lvds_mode_set,
 603         .commit = intel_lvds_commit,
 604 };
 605
 606 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 607         .get_modes = intel_lvds_get_modes,
 608         .mode_valid = intel_lvds_mode_valid,
 609         .best_encoder = intel_best_encoder,
 610 };
 611
 612 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 613         .dpms = drm_helper_connector_dpms,
 614         .detect = intel_lvds_detect,
 615         .fill_modes = drm_helper_probe_single_connector_modes,
 616         .set_property = intel_lvds_set_property,
 617         .destroy = intel_lvds_destroy,
 618 };
 619
 620 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 621         .destroy = intel_encoder_destroy,
 622 };
 623
 624 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 625 {
 626         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 627         return 1;
 628 }
 629
 630 /* These systems claim to have LVDS, but really don't */
 631 static const struct dmi_system_id intel_no_lvds[] = {
 632         {
 633                 .callback = intel_no_lvds_dmi_callback,
 634                 .ident = "Apple Mac Mini (Core series)",
 635                 .matches = {
 636                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 637                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 638                 },
 639         },
 640         {
 641                 .callback = intel_no_lvds_dmi_callback,
 642                 .ident = "Apple Mac Mini (Core 2 series)",
 643                 .matches = {
 644                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 645                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 646                 },
 647         },
 648         {
 649                 .callback = intel_no_lvds_dmi_callback,
 650                 .ident = "MSI IM-945GSE-A",
 651                 .matches = {
 652                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 653                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 654                 },
 655         },
 656         {
 657                 .callback = intel_no_lvds_dmi_callback,
 658                 .ident = "Dell Studio Hybrid",
 659                 .matches = {
 660                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 661                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 662                 },
 663         },
 664         {
 665                 .callback = intel_no_lvds_dmi_callback,
 666                 .ident = "Dell OptiPlex FX170",
 667                 .matches = {
 668                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 669                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 670                 },
 671         },
 672         {
 673                 .callback = intel_no_lvds_dmi_callback,
 674                 .ident = "AOpen Mini PC",
 675                 .matches = {
 676                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 677                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 678                 },
 679         },
 680         {
 681                 .callback = intel_no_lvds_dmi_callback,
 682                 .ident = "AOpen Mini PC MP915",
 683                 .matches = {
 684                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 685                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 686                 },
 687         },
 688         {
 689                 .callback = intel_no_lvds_dmi_callback,
 690                 .ident = "AOpen i915GMm-HFS",
 691                 .matches = {
 692                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 693                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 694                 },
 695         },
 696         {
 697                 .callback = intel_no_lvds_dmi_callback,
 698                 .ident = "AOpen i45GMx-I",
 699                 .matches = {
 700                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 701                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 702                 },
 703         },
 704         {
 705                 .callback = intel_no_lvds_dmi_callback,
 706                 .ident = "Aopen i945GTt-VFA",
 707                 .matches = {
 708                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 709                 },
 710         },
 711         {
 712                 .callback = intel_no_lvds_dmi_callback,
 713                 .ident = "Clientron U800",
 714                 .matches = {
 715                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 716                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 717                 },
 718         },
 719         {
 720                 .callback = intel_no_lvds_dmi_callback,
 721                 .ident = "Clientron E830",
 722                 .matches = {
 723                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 724                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 725                 },
 726         },
 727         {
 728                 .callback = intel_no_lvds_dmi_callback,
 729                 .ident = "Asus EeeBox PC EB1007",
 730                 .matches = {
 731                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 732                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 733                 },
 734         },
 735         {
 736                 .callback = intel_no_lvds_dmi_callback,
 737                 .ident = "Asus AT5NM10T-I",
 738                 .matches = {
 739                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 740                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 741                 },
 742         },
 743         {
 744                 .callback = intel_no_lvds_dmi_callback,
 745                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 746                 .matches = {
 747                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 748                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 749                 },
 750         },
 751         {
 752                 .callback = intel_no_lvds_dmi_callback,
 753                 .ident = "Hewlett-Packard t5745",
 754                 .matches = {
 755                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 756                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 757                 },
 758         },
 759         {
 760                 .callback = intel_no_lvds_dmi_callback,
 761                 .ident = "Hewlett-Packard st5747",
 762                 .matches = {
 763                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 764                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 765                 },
 766         },
 767         {
 768                 .callback = intel_no_lvds_dmi_callback,
 769                 .ident = "MSI Wind Box DC500",
 770                 .matches = {
 771                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 772                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 773                 },
 774         },
 775         {
 776                 .callback = intel_no_lvds_dmi_callback,
 777                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
 778                 .matches = {
 779                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
 780                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
 781                 },
 782         },
 783
 784         { }     /* terminating entry */
 785 };
 786
 787 /**
 788  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 789  * @dev: drm device
 790  * @connector: LVDS connector
 791  *
 792  * Find the reduced downclock for LVDS in EDID.
 793  */
 794 static void intel_find_lvds_downclock(struct drm_device *dev,
 795                                       struct drm_display_mode *fixed_mode,
 796                                       struct drm_connector *connector)
 797 {
 798         struct drm_i915_private *dev_priv = dev->dev_private;
 799         struct drm_display_mode *scan;
 800         int temp_downclock;
 801
 802         temp_downclock = fixed_mode->clock;
 803         list_for_each_entry(scan, &connector->probed_modes, head) {
 804                 /*
 805                  * If one mode has the same resolution with the fixed_panel
 806                  * mode while they have the different refresh rate, it means
 807                  * that the reduced downclock is found for the LVDS. In such
 808                  * case we can set the different FPx0/1 to dynamically select
 809                  * between low and high frequency.
 810                  */
 811                 if (scan->hdisplay == fixed_mode->hdisplay &&
 812                     scan->hsync_start == fixed_mode->hsync_start &&
 813                     scan->hsync_end == fixed_mode->hsync_end &&
 814                     scan->htotal == fixed_mode->htotal &&
 815                     scan->vdisplay == fixed_mode->vdisplay &&
 816                     scan->vsync_start == fixed_mode->vsync_start &&
 817                     scan->vsync_end == fixed_mode->vsync_end &&
 818                     scan->vtotal == fixed_mode->vtotal) {
 819                         if (scan->clock < temp_downclock) {
 820                                 /*
 821                                  * The downclock is already found. But we
 822                                  * expect to find the lower downclock.
 823                                  */
 824                                 temp_downclock = scan->clock;
 825                         }
 826                 }
 827         }
 828         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 829                 /* We found the downclock for LVDS. */
 830                 dev_priv->lvds_downclock_avail = 1;
 831                 dev_priv->lvds_downclock = temp_downclock;
 832                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 833                               "Normal clock %dKhz, downclock %dKhz\n",
 834                               fixed_mode->clock, temp_downclock);
 835         }
 836 }
 837
 838 /*
 839  * Enumerate the child dev array parsed from VBT to check whether
 840  * the LVDS is present.
 841  * If it is present, return 1.
 842  * If it is not present, return false.
 843  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 844  */
 845 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 846                                    u8 *i2c_pin)
 847 {
 848         struct drm_i915_private *dev_priv = dev->dev_private;
 849         int i;
 850
 851         if (!dev_priv->child_dev_num)
 852                 return true;
 853
 854         for (i = 0; i < dev_priv->child_dev_num; i++) {
 855                 struct child_device_config *child = dev_priv->child_dev + i;
 856
 857                 /* If the device type is not LFP, continue.
 858                  * We have to check both the new identifiers as well as the
 859                  * old for compatibility with some BIOSes.
 860                  */
 861                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 862                     child->device_type != DEVICE_TYPE_LFP)
 863                         continue;
 864
 865                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 866                         *i2c_pin = child->i2c_pin;
 867
 868                 /* However, we cannot trust the BIOS writers to populate
 869                  * the VBT correctly.  Since LVDS requires additional
 870                  * information from AIM blocks, a non-zero addin offset is
 871                  * a good indicator that the LVDS is actually present.
 872                  */
 873                 if (child->addin_offset)
 874                         return true;
 875
 876                 /* But even then some BIOS writers perform some black magic
 877                  * and instantiate the device without reference to any
 878                  * additional data.  Trust that if the VBT was written into
 879                  * the OpRegion then they have validated the LVDS's existence.
 880                  */
 881                 if (dev_priv->opregion.vbt)
 882                         return true;
 883         }
 884
 885         return false;
 886 }
 887
 888 static bool intel_lvds_supported(struct drm_device *dev)
 889 {
 890         /* With the introduction of the PCH we gained a dedicated
 891          * LVDS presence pin, use it. */
 892         if (HAS_PCH_SPLIT(dev))
 893                 return true;
 894
 895         /* Otherwise LVDS was only attached to mobile products,
 896          * except for the inglorious 830gm */
 897         return IS_MOBILE(dev) && !IS_I830(dev);
 898 }
 899
 900 /**
 901  * intel_lvds_init - setup LVDS connectors on this device
 902  * @dev: drm device
 903  *
 904  * Create the connector, register the LVDS DDC bus, and try to figure out what
 905  * modes we can display on the LVDS panel (if present).
 906  */
 907 bool intel_lvds_init(struct drm_device *dev)
 908 {
 909         struct drm_i915_private *dev_priv = dev->dev_private;
 910         struct intel_lvds *intel_lvds;
 911         struct intel_encoder *intel_encoder;
 912         struct intel_connector *intel_connector;
 913         struct drm_connector *connector;
 914         struct drm_encoder *encoder;
 915         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 916         struct drm_crtc *crtc;
 917         u32 lvds;
 918         int pipe;
 919         u8 pin;
 920
 921         if (!intel_lvds_supported(dev))
 922                 return false;
 923
 924         /* Skip init on machines we know falsely report LVDS */
 925         if (dmi_check_system(intel_no_lvds))
 926                 return false;
 927
 928         pin = GMBUS_PORT_PANEL;
 929         if (!lvds_is_present_in_vbt(dev, &pin)) {
 930                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 931                 return false;
 932         }
 933
 934         if (HAS_PCH_SPLIT(dev)) {
 935                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 936                         return false;
 937                 if (dev_priv->edp.support) {
 938                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 939                         return false;
 940                 }
 941         }
 942
 943         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
 944         if (!intel_lvds) {
 945                 return false;
 946         }
 947
 948         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 949         if (!intel_connector) {
 950                 kfree(intel_lvds);
 951                 return false;
 952         }
 953
 954         if (!HAS_PCH_SPLIT(dev)) {
 955                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
 956         }
 957
 958         intel_encoder = &intel_lvds->base;
 959         encoder = &intel_encoder->base;
 960         connector = &intel_connector->base;
 961         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 962                            DRM_MODE_CONNECTOR_LVDS);
 963
 964         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 965                          DRM_MODE_ENCODER_LVDS);
 966
 967         intel_connector_attach_encoder(intel_connector, intel_encoder);
 968         intel_encoder->type = INTEL_OUTPUT_LVDS;
 969
 970         intel_encoder->cloneable = false;
 971         if (HAS_PCH_SPLIT(dev))
 972                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 973         else if (IS_GEN4(dev))
 974                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 975         else
 976                 intel_encoder->crtc_mask = (1 << 1);
 977
 978         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 979         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 980         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 981         connector->interlace_allowed = false;
 982         connector->doublescan_allowed = false;
 983
 984         /* create the scaling mode property */
 985         drm_mode_create_scaling_mode_property(dev);
 986         /*
 987          * the initial panel fitting mode will be FULL_SCREEN.
 988          */
 989
 990         drm_connector_attach_property(&intel_connector->base,
 991                                       dev->mode_config.scaling_mode_property,
 992                                       DRM_MODE_SCALE_ASPECT);
 993         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
 994         /*
 995          * LVDS discovery:
 996          * 1) check for EDID on DDC
 997          * 2) check for VBT data
 998          * 3) check to see if LVDS is already on
 999          *    if none of the above, no panel
1000          * 4) make sure lid is open
1001          *    if closed, act like it's not there for now
1002          */
1003
1004         /*
1005          * Attempt to get the fixed panel mode from DDC.  Assume that the
1006          * preferred mode is the right one.
1007          */
1008         intel_lvds->edid = drm_get_edid(connector,
1009                                         intel_gmbus_get_adapter(dev_priv,
1010                                                                 pin));
1011         if (intel_lvds->edid) {
1012                 if (drm_add_edid_modes(connector,
1013                                        intel_lvds->edid)) {
1014                         drm_mode_connector_update_edid_property(connector,
1015                                                                 intel_lvds->edid);
1016                 } else {
1017                         kfree(intel_lvds->edid);
1018                         intel_lvds->edid = NULL;
1019                 }
1020         }
1021         if (!intel_lvds->edid) {
1022                 /* Didn't get an EDID, so
1023                  * Set wide sync ranges so we get all modes
1024                  * handed to valid_mode for checking
1025                  */
1026                 connector->display_info.min_vfreq = 0;
1027                 connector->display_info.max_vfreq = 200;
1028                 connector->display_info.min_hfreq = 0;
1029                 connector->display_info.max_hfreq = 200;
1030         }
1031
1032         list_for_each_entry(scan, &connector->probed_modes, head) {
1033                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1034                         intel_lvds->fixed_mode =
1035                                 drm_mode_duplicate(dev, scan);
1036                         intel_find_lvds_downclock(dev,
1037                                                   intel_lvds->fixed_mode,
1038                                                   connector);
1039                         goto out;
1040                 }
1041         }
1042
1043         /* Failed to get EDID, what about VBT? */
1044         if (dev_priv->lfp_lvds_vbt_mode) {
1045                 intel_lvds->fixed_mode =
1046                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1047                 if (intel_lvds->fixed_mode) {
1048                         intel_lvds->fixed_mode->type |=
1049                                 DRM_MODE_TYPE_PREFERRED;
1050                         goto out;
1051                 }
1052         }
1053
1054         /*
1055          * If we didn't get EDID, try checking if the panel is already turned
1056          * on.  If so, assume that whatever is currently programmed is the
1057          * correct mode.
1058          */
1059
1060         /* Ironlake: FIXME if still fail, not try pipe mode now */
1061         if (HAS_PCH_SPLIT(dev))
1062                 goto failed;
1063
1064         lvds = I915_READ(LVDS);
1065         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1066         crtc = intel_get_crtc_for_pipe(dev, pipe);
1067
1068         if (crtc && (lvds & LVDS_PORT_EN)) {
1069                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1070                 if (intel_lvds->fixed_mode) {
1071                         intel_lvds->fixed_mode->type |=
1072                                 DRM_MODE_TYPE_PREFERRED;
1073                         goto out;
1074                 }
1075         }
1076
1077         /* If we still don't have a mode after all that, give up. */
1078         if (!intel_lvds->fixed_mode)
1079                 goto failed;
1080
1081 out:
1082         /*
1083          * Unlock registers and just
1084          * leave them unlocked
1085          */
1086         if (HAS_PCH_SPLIT(dev)) {
1087                 I915_WRITE(PCH_PP_CONTROL,
1088                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1089         } else {
1090                 I915_WRITE(PP_CONTROL,
1091                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1092         }
1093         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1094         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1095                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1096                 dev_priv->lid_notifier.notifier_call = NULL;
1097         }
1098         /* keep the LVDS connector */
1099         dev_priv->int_lvds_connector = connector;
1100         drm_sysfs_connector_add(connector);
1101
1102         intel_panel_setup_backlight(dev);
1103
1104         return true;
1105
1106 failed:
1107         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1108         drm_connector_cleanup(connector);
1109         drm_encoder_cleanup(encoder);
1110         kfree(intel_lvds);
1111         kfree(intel_connector);
1112         return false;
1113 }