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         /*
 413          * Prior to Ironlake, we must disable the pipe if we want to adjust
 414          * the panel fitter. However at all other times we can just reset
 415          * the registers regardless.
 416          */
 417         if (!HAS_PCH_SPLIT(encoder->dev) && intel_lvds->pfit_dirty)
 418                 intel_lvds_disable(intel_lvds);
 419 }
 420
 421 static void intel_lvds_commit(struct drm_encoder *encoder)
 422 {
 423         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 424
 425         /* Always do a full power on as we do not know what state
 426          * we were left in.
 427          */
 428         intel_lvds_enable(intel_lvds);
 429 }
 430
 431 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 432                                 struct drm_display_mode *mode,
 433                                 struct drm_display_mode *adjusted_mode)
 434 {
 435         /*
 436          * The LVDS pin pair will already have been turned on in the
 437          * intel_crtc_mode_set since it has a large impact on the DPLL
 438          * settings.
 439          */
 440 }
 441
 442 /**
 443  * Detect the LVDS connection.
 444  *
 445  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 446  * connected and closed means disconnected.  We also send hotplug events as
 447  * needed, using lid status notification from the input layer.
 448  */
 449 static enum drm_connector_status
 450 intel_lvds_detect(struct drm_connector *connector, bool force)
 451 {
 452         struct drm_device *dev = connector->dev;
 453         enum drm_connector_status status;
 454
 455         status = intel_panel_detect(dev);
 456         if (status != connector_status_unknown)
 457                 return status;
 458
 459         return connector_status_connected;
 460 }
 461
 462 /**
 463  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 464  */
 465 static int intel_lvds_get_modes(struct drm_connector *connector)
 466 {
 467         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 468         struct drm_device *dev = connector->dev;
 469         struct drm_display_mode *mode;
 470
 471         if (intel_lvds->edid)
 472                 return drm_add_edid_modes(connector, intel_lvds->edid);
 473
 474         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
 475         if (mode == NULL)
 476                 return 0;
 477
 478         drm_mode_probed_add(connector, mode);
 479         return 1;
 480 }
 481
 482 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 483 {
 484         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 485         return 1;
 486 }
 487
 488 /* The GPU hangs up on these systems if modeset is performed on LID open */
 489 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 490         {
 491                 .callback = intel_no_modeset_on_lid_dmi_callback,
 492                 .ident = "Toshiba Tecra A11",
 493                 .matches = {
 494                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 495                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 496                 },
 497         },
 498
 499         { }     /* terminating entry */
 500 };
 501
 502 /*
 503  * Lid events. Note the use of 'modeset_on_lid':
 504  *  - we set it on lid close, and reset it on open
 505  *  - we use it as a "only once" bit (ie we ignore
 506  *    duplicate events where it was already properly
 507  *    set/reset)
 508  *  - the suspend/resume paths will also set it to
 509  *    zero, since they restore the mode ("lid open").
 510  */
 511 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 512                             void *unused)
 513 {
 514         struct drm_i915_private *dev_priv =
 515                 container_of(nb, struct drm_i915_private, lid_notifier);
 516         struct drm_device *dev = dev_priv->dev;
 517         struct drm_connector *connector = dev_priv->int_lvds_connector;
 518
 519         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 520                 return NOTIFY_OK;
 521
 522         /*
 523          * check and update the status of LVDS connector after receiving
 524          * the LID nofication event.
 525          */
 526         if (connector)
 527                 connector->status = connector->funcs->detect(connector,
 528                                                              false);
 529
 530         /* Don't force modeset on machines where it causes a GPU lockup */
 531         if (dmi_check_system(intel_no_modeset_on_lid))
 532                 return NOTIFY_OK;
 533         if (!acpi_lid_open()) {
 534                 dev_priv->modeset_on_lid = 1;
 535                 return NOTIFY_OK;
 536         }
 537
 538         if (!dev_priv->modeset_on_lid)
 539                 return NOTIFY_OK;
 540
 541         dev_priv->modeset_on_lid = 0;
 542
 543         mutex_lock(&dev->mode_config.mutex);
 544         drm_helper_resume_force_mode(dev);
 545         mutex_unlock(&dev->mode_config.mutex);
 546
 547         return NOTIFY_OK;
 548 }
 549
 550 /**
 551  * intel_lvds_destroy - unregister and free LVDS structures
 552  * @connector: connector to free
 553  *
 554  * Unregister the DDC bus for this connector then free the driver private
 555  * structure.
 556  */
 557 static void intel_lvds_destroy(struct drm_connector *connector)
 558 {
 559         struct drm_device *dev = connector->dev;
 560         struct drm_i915_private *dev_priv = dev->dev_private;
 561
 562         intel_panel_destroy_backlight(dev);
 563
 564         if (dev_priv->lid_notifier.notifier_call)
 565                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 566         drm_sysfs_connector_remove(connector);
 567         drm_connector_cleanup(connector);
 568         kfree(connector);
 569 }
 570
 571 static int intel_lvds_set_property(struct drm_connector *connector,
 572                                    struct drm_property *property,
 573                                    uint64_t value)
 574 {
 575         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 576         struct drm_device *dev = connector->dev;
 577
 578         if (property == dev->mode_config.scaling_mode_property) {
 579                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
 580
 581                 if (value == DRM_MODE_SCALE_NONE) {
 582                         DRM_DEBUG_KMS("no scaling not supported\n");
 583                         return -EINVAL;
 584                 }
 585
 586                 if (intel_lvds->fitting_mode == value) {
 587                         /* the LVDS scaling property is not changed */
 588                         return 0;
 589                 }
 590                 intel_lvds->fitting_mode = value;
 591                 if (crtc && crtc->enabled) {
 592                         /*
 593                          * If the CRTC is enabled, the display will be changed
 594                          * according to the new panel fitting mode.
 595                          */
 596                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
 597                                 crtc->x, crtc->y, crtc->fb);
 598                 }
 599         }
 600
 601         return 0;
 602 }
 603
 604 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 605         .dpms = intel_lvds_dpms,
 606         .mode_fixup = intel_lvds_mode_fixup,
 607         .prepare = intel_lvds_prepare,
 608         .mode_set = intel_lvds_mode_set,
 609         .commit = intel_lvds_commit,
 610 };
 611
 612 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 613         .get_modes = intel_lvds_get_modes,
 614         .mode_valid = intel_lvds_mode_valid,
 615         .best_encoder = intel_best_encoder,
 616 };
 617
 618 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 619         .dpms = drm_helper_connector_dpms,
 620         .detect = intel_lvds_detect,
 621         .fill_modes = drm_helper_probe_single_connector_modes,
 622         .set_property = intel_lvds_set_property,
 623         .destroy = intel_lvds_destroy,
 624 };
 625
 626 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 627         .destroy = intel_encoder_destroy,
 628 };
 629
 630 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 631 {
 632         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 633         return 1;
 634 }
 635
 636 /* These systems claim to have LVDS, but really don't */
 637 static const struct dmi_system_id intel_no_lvds[] = {
 638         {
 639                 .callback = intel_no_lvds_dmi_callback,
 640                 .ident = "Apple Mac Mini (Core series)",
 641                 .matches = {
 642                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 643                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 644                 },
 645         },
 646         {
 647                 .callback = intel_no_lvds_dmi_callback,
 648                 .ident = "Apple Mac Mini (Core 2 series)",
 649                 .matches = {
 650                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 651                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 652                 },
 653         },
 654         {
 655                 .callback = intel_no_lvds_dmi_callback,
 656                 .ident = "MSI IM-945GSE-A",
 657                 .matches = {
 658                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 659                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 660                 },
 661         },
 662         {
 663                 .callback = intel_no_lvds_dmi_callback,
 664                 .ident = "Dell Studio Hybrid",
 665                 .matches = {
 666                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 667                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 668                 },
 669         },
 670         {
 671                 .callback = intel_no_lvds_dmi_callback,
 672                 .ident = "Dell OptiPlex FX170",
 673                 .matches = {
 674                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 675                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 676                 },
 677         },
 678         {
 679                 .callback = intel_no_lvds_dmi_callback,
 680                 .ident = "AOpen Mini PC",
 681                 .matches = {
 682                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 683                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 684                 },
 685         },
 686         {
 687                 .callback = intel_no_lvds_dmi_callback,
 688                 .ident = "AOpen Mini PC MP915",
 689                 .matches = {
 690                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 691                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 692                 },
 693         },
 694         {
 695                 .callback = intel_no_lvds_dmi_callback,
 696                 .ident = "AOpen i915GMm-HFS",
 697                 .matches = {
 698                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 699                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 700                 },
 701         },
 702         {
 703                 .callback = intel_no_lvds_dmi_callback,
 704                 .ident = "AOpen i45GMx-I",
 705                 .matches = {
 706                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 707                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 708                 },
 709         },
 710         {
 711                 .callback = intel_no_lvds_dmi_callback,
 712                 .ident = "Aopen i945GTt-VFA",
 713                 .matches = {
 714                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 715                 },
 716         },
 717         {
 718                 .callback = intel_no_lvds_dmi_callback,
 719                 .ident = "Clientron U800",
 720                 .matches = {
 721                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 722                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 723                 },
 724         },
 725         {
 726                 .callback = intel_no_lvds_dmi_callback,
 727                 .ident = "Clientron E830",
 728                 .matches = {
 729                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 730                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 731                 },
 732         },
 733         {
 734                 .callback = intel_no_lvds_dmi_callback,
 735                 .ident = "Asus EeeBox PC EB1007",
 736                 .matches = {
 737                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 738                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 739                 },
 740         },
 741         {
 742                 .callback = intel_no_lvds_dmi_callback,
 743                 .ident = "Asus AT5NM10T-I",
 744                 .matches = {
 745                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 746                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 747                 },
 748         },
 749         {
 750                 .callback = intel_no_lvds_dmi_callback,
 751                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 752                 .matches = {
 753                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 754                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 755                 },
 756         },
 757         {
 758                 .callback = intel_no_lvds_dmi_callback,
 759                 .ident = "Hewlett-Packard t5745",
 760                 .matches = {
 761                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 762                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 763                 },
 764         },
 765         {
 766                 .callback = intel_no_lvds_dmi_callback,
 767                 .ident = "Hewlett-Packard st5747",
 768                 .matches = {
 769                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 770                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 771                 },
 772         },
 773         {
 774                 .callback = intel_no_lvds_dmi_callback,
 775                 .ident = "MSI Wind Box DC500",
 776                 .matches = {
 777                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 778                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 779                 },
 780         },
 781         {
 782                 .callback = intel_no_lvds_dmi_callback,
 783                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
 784                 .matches = {
 785                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
 786                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
 787                 },
 788         },
 789
 790         { }     /* terminating entry */
 791 };
 792
 793 /**
 794  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 795  * @dev: drm device
 796  * @connector: LVDS connector
 797  *
 798  * Find the reduced downclock for LVDS in EDID.
 799  */
 800 static void intel_find_lvds_downclock(struct drm_device *dev,
 801                                       struct drm_display_mode *fixed_mode,
 802                                       struct drm_connector *connector)
 803 {
 804         struct drm_i915_private *dev_priv = dev->dev_private;
 805         struct drm_display_mode *scan;
 806         int temp_downclock;
 807
 808         temp_downclock = fixed_mode->clock;
 809         list_for_each_entry(scan, &connector->probed_modes, head) {
 810                 /*
 811                  * If one mode has the same resolution with the fixed_panel
 812                  * mode while they have the different refresh rate, it means
 813                  * that the reduced downclock is found for the LVDS. In such
 814                  * case we can set the different FPx0/1 to dynamically select
 815                  * between low and high frequency.
 816                  */
 817                 if (scan->hdisplay == fixed_mode->hdisplay &&
 818                     scan->hsync_start == fixed_mode->hsync_start &&
 819                     scan->hsync_end == fixed_mode->hsync_end &&
 820                     scan->htotal == fixed_mode->htotal &&
 821                     scan->vdisplay == fixed_mode->vdisplay &&
 822                     scan->vsync_start == fixed_mode->vsync_start &&
 823                     scan->vsync_end == fixed_mode->vsync_end &&
 824                     scan->vtotal == fixed_mode->vtotal) {
 825                         if (scan->clock < temp_downclock) {
 826                                 /*
 827                                  * The downclock is already found. But we
 828                                  * expect to find the lower downclock.
 829                                  */
 830                                 temp_downclock = scan->clock;
 831                         }
 832                 }
 833         }
 834         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 835                 /* We found the downclock for LVDS. */
 836                 dev_priv->lvds_downclock_avail = 1;
 837                 dev_priv->lvds_downclock = temp_downclock;
 838                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 839                               "Normal clock %dKhz, downclock %dKhz\n",
 840                               fixed_mode->clock, temp_downclock);
 841         }
 842 }
 843
 844 /*
 845  * Enumerate the child dev array parsed from VBT to check whether
 846  * the LVDS is present.
 847  * If it is present, return 1.
 848  * If it is not present, return false.
 849  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 850  */
 851 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 852                                    u8 *i2c_pin)
 853 {
 854         struct drm_i915_private *dev_priv = dev->dev_private;
 855         int i;
 856
 857         if (!dev_priv->child_dev_num)
 858                 return true;
 859
 860         for (i = 0; i < dev_priv->child_dev_num; i++) {
 861                 struct child_device_config *child = dev_priv->child_dev + i;
 862
 863                 /* If the device type is not LFP, continue.
 864                  * We have to check both the new identifiers as well as the
 865                  * old for compatibility with some BIOSes.
 866                  */
 867                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 868                     child->device_type != DEVICE_TYPE_LFP)
 869                         continue;
 870
 871                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 872                         *i2c_pin = child->i2c_pin;
 873
 874                 /* However, we cannot trust the BIOS writers to populate
 875                  * the VBT correctly.  Since LVDS requires additional
 876                  * information from AIM blocks, a non-zero addin offset is
 877                  * a good indicator that the LVDS is actually present.
 878                  */
 879                 if (child->addin_offset)
 880                         return true;
 881
 882                 /* But even then some BIOS writers perform some black magic
 883                  * and instantiate the device without reference to any
 884                  * additional data.  Trust that if the VBT was written into
 885                  * the OpRegion then they have validated the LVDS's existence.
 886                  */
 887                 if (dev_priv->opregion.vbt)
 888                         return true;
 889         }
 890
 891         return false;
 892 }
 893
 894 static bool intel_lvds_supported(struct drm_device *dev)
 895 {
 896         /* With the introduction of the PCH we gained a dedicated
 897          * LVDS presence pin, use it. */
 898         if (HAS_PCH_SPLIT(dev))
 899                 return true;
 900
 901         /* Otherwise LVDS was only attached to mobile products,
 902          * except for the inglorious 830gm */
 903         return IS_MOBILE(dev) && !IS_I830(dev);
 904 }
 905
 906 /**
 907  * intel_lvds_init - setup LVDS connectors on this device
 908  * @dev: drm device
 909  *
 910  * Create the connector, register the LVDS DDC bus, and try to figure out what
 911  * modes we can display on the LVDS panel (if present).
 912  */
 913 bool intel_lvds_init(struct drm_device *dev)
 914 {
 915         struct drm_i915_private *dev_priv = dev->dev_private;
 916         struct intel_lvds *intel_lvds;
 917         struct intel_encoder *intel_encoder;
 918         struct intel_connector *intel_connector;
 919         struct drm_connector *connector;
 920         struct drm_encoder *encoder;
 921         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 922         struct drm_crtc *crtc;
 923         u32 lvds;
 924         int pipe;
 925         u8 pin;
 926
 927         if (!intel_lvds_supported(dev))
 928                 return false;
 929
 930         /* Skip init on machines we know falsely report LVDS */
 931         if (dmi_check_system(intel_no_lvds))
 932                 return false;
 933
 934         pin = GMBUS_PORT_PANEL;
 935         if (!lvds_is_present_in_vbt(dev, &pin)) {
 936                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 937                 return false;
 938         }
 939
 940         if (HAS_PCH_SPLIT(dev)) {
 941                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 942                         return false;
 943                 if (dev_priv->edp.support) {
 944                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 945                         return false;
 946                 }
 947         }
 948
 949         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
 950         if (!intel_lvds) {
 951                 return false;
 952         }
 953
 954         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 955         if (!intel_connector) {
 956                 kfree(intel_lvds);
 957                 return false;
 958         }
 959
 960         if (!HAS_PCH_SPLIT(dev)) {
 961                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
 962         }
 963
 964         intel_encoder = &intel_lvds->base;
 965         encoder = &intel_encoder->base;
 966         connector = &intel_connector->base;
 967         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 968                            DRM_MODE_CONNECTOR_LVDS);
 969
 970         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 971                          DRM_MODE_ENCODER_LVDS);
 972
 973         intel_connector_attach_encoder(intel_connector, intel_encoder);
 974         intel_encoder->type = INTEL_OUTPUT_LVDS;
 975
 976         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
 977         if (HAS_PCH_SPLIT(dev))
 978                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 979         else if (IS_GEN4(dev))
 980                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 981         else
 982                 intel_encoder->crtc_mask = (1 << 1);
 983
 984         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 985         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 986         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 987         connector->interlace_allowed = false;
 988         connector->doublescan_allowed = false;
 989
 990         /* create the scaling mode property */
 991         drm_mode_create_scaling_mode_property(dev);
 992         /*
 993          * the initial panel fitting mode will be FULL_SCREEN.
 994          */
 995
 996         drm_connector_attach_property(&intel_connector->base,
 997                                       dev->mode_config.scaling_mode_property,
 998                                       DRM_MODE_SCALE_ASPECT);
 999         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
1000         /*
1001          * LVDS discovery:
1002          * 1) check for EDID on DDC
1003          * 2) check for VBT data
1004          * 3) check to see if LVDS is already on
1005          *    if none of the above, no panel
1006          * 4) make sure lid is open
1007          *    if closed, act like it's not there for now
1008          */
1009
1010         /*
1011          * Attempt to get the fixed panel mode from DDC.  Assume that the
1012          * preferred mode is the right one.
1013          */
1014         intel_lvds->edid = drm_get_edid(connector,
1015                                         intel_gmbus_get_adapter(dev_priv,
1016                                                                 pin));
1017         if (intel_lvds->edid) {
1018                 if (drm_add_edid_modes(connector,
1019                                        intel_lvds->edid)) {
1020                         drm_mode_connector_update_edid_property(connector,
1021                                                                 intel_lvds->edid);
1022                 } else {
1023                         kfree(intel_lvds->edid);
1024                         intel_lvds->edid = NULL;
1025                 }
1026         }
1027         if (!intel_lvds->edid) {
1028                 /* Didn't get an EDID, so
1029                  * Set wide sync ranges so we get all modes
1030                  * handed to valid_mode for checking
1031                  */
1032                 connector->display_info.min_vfreq = 0;
1033                 connector->display_info.max_vfreq = 200;
1034                 connector->display_info.min_hfreq = 0;
1035                 connector->display_info.max_hfreq = 200;
1036         }
1037
1038         list_for_each_entry(scan, &connector->probed_modes, head) {
1039                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1040                         intel_lvds->fixed_mode =
1041                                 drm_mode_duplicate(dev, scan);
1042                         intel_find_lvds_downclock(dev,
1043                                                   intel_lvds->fixed_mode,
1044                                                   connector);
1045                         goto out;
1046                 }
1047         }
1048
1049         /* Failed to get EDID, what about VBT? */
1050         if (dev_priv->lfp_lvds_vbt_mode) {
1051                 intel_lvds->fixed_mode =
1052                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1053                 if (intel_lvds->fixed_mode) {
1054                         intel_lvds->fixed_mode->type |=
1055                                 DRM_MODE_TYPE_PREFERRED;
1056                         goto out;
1057                 }
1058         }
1059
1060         /*
1061          * If we didn't get EDID, try checking if the panel is already turned
1062          * on.  If so, assume that whatever is currently programmed is the
1063          * correct mode.
1064          */
1065
1066         /* Ironlake: FIXME if still fail, not try pipe mode now */
1067         if (HAS_PCH_SPLIT(dev))
1068                 goto failed;
1069
1070         lvds = I915_READ(LVDS);
1071         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1072         crtc = intel_get_crtc_for_pipe(dev, pipe);
1073
1074         if (crtc && (lvds & LVDS_PORT_EN)) {
1075                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1076                 if (intel_lvds->fixed_mode) {
1077                         intel_lvds->fixed_mode->type |=
1078                                 DRM_MODE_TYPE_PREFERRED;
1079                         goto out;
1080                 }
1081         }
1082
1083         /* If we still don't have a mode after all that, give up. */
1084         if (!intel_lvds->fixed_mode)
1085                 goto failed;
1086
1087 out:
1088         /*
1089          * Unlock registers and just
1090          * leave them unlocked
1091          */
1092         if (HAS_PCH_SPLIT(dev)) {
1093                 I915_WRITE(PCH_PP_CONTROL,
1094                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1095         } else {
1096                 I915_WRITE(PP_CONTROL,
1097                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1098         }
1099         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1100         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1101                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1102                 dev_priv->lid_notifier.notifier_call = NULL;
1103         }
1104         /* keep the LVDS connector */
1105         dev_priv->int_lvds_connector = connector;
1106         drm_sysfs_connector_add(connector);
1107
1108         intel_panel_setup_backlight(dev);
1109
1110         return true;
1111
1112 failed:
1113         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1114         drm_connector_cleanup(connector);
1115         drm_encoder_cleanup(encoder);
1116         kfree(intel_lvds);
1117         kfree(intel_connector);
1118         return false;
1119 }