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 drm_i915_private *dev_priv = dev->dev_private;
  75         u32 ctl_reg, lvds_reg;
  76
  77         if (HAS_PCH_SPLIT(dev)) {
  78                 ctl_reg = PCH_PP_CONTROL;
  79                 lvds_reg = PCH_LVDS;
  80         } else {
  81                 ctl_reg = PP_CONTROL;
  82                 lvds_reg = LVDS;
  83         }
  84
  85         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
  86
  87         if (intel_lvds->pfit_dirty) {
  88                 /*
  89                  * Enable automatic panel scaling so that non-native modes
  90                  * fill the screen.  The panel fitter should only be
  91                  * adjusted whilst the pipe is disabled, according to
  92                  * register description and PRM.
  93                  */
  94                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
  95                               intel_lvds->pfit_control,
  96                               intel_lvds->pfit_pgm_ratios);
  97                 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000)) {
  98                         DRM_ERROR("timed out waiting for panel to power off\n");
  99                 } else {
 100                         I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
 101                         I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
 102                         intel_lvds->pfit_dirty = false;
 103                 }
 104         }
 105
 106         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 107         POSTING_READ(lvds_reg);
 108
 109         intel_panel_set_backlight(dev, dev_priv->backlight_level);
 110 }
 111
 112 static void intel_lvds_disable(struct intel_lvds *intel_lvds)
 113 {
 114         struct drm_device *dev = intel_lvds->base.base.dev;
 115         struct drm_i915_private *dev_priv = dev->dev_private;
 116         u32 ctl_reg, lvds_reg;
 117
 118         if (HAS_PCH_SPLIT(dev)) {
 119                 ctl_reg = PCH_PP_CONTROL;
 120                 lvds_reg = PCH_LVDS;
 121         } else {
 122                 ctl_reg = PP_CONTROL;
 123                 lvds_reg = LVDS;
 124         }
 125
 126         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 127         intel_panel_set_backlight(dev, 0);
 128
 129         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 130
 131         if (intel_lvds->pfit_control) {
 132                 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
 133                         DRM_ERROR("timed out waiting for panel to power off\n");
 134
 135                 I915_WRITE(PFIT_CONTROL, 0);
 136                 intel_lvds->pfit_dirty = true;
 137         }
 138
 139         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 140         POSTING_READ(lvds_reg);
 141 }
 142
 143 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
 144 {
 145         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 146
 147         if (mode == DRM_MODE_DPMS_ON)
 148                 intel_lvds_enable(intel_lvds);
 149         else
 150                 intel_lvds_disable(intel_lvds);
 151
 152         /* XXX: We never power down the LVDS pairs. */
 153 }
 154
 155 static int intel_lvds_mode_valid(struct drm_connector *connector,
 156                                  struct drm_display_mode *mode)
 157 {
 158         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 159         struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
 160
 161         if (mode->hdisplay > fixed_mode->hdisplay)
 162                 return MODE_PANEL;
 163         if (mode->vdisplay > fixed_mode->vdisplay)
 164                 return MODE_PANEL;
 165
 166         return MODE_OK;
 167 }
 168
 169 static void
 170 centre_horizontally(struct drm_display_mode *mode,
 171                     int width)
 172 {
 173         u32 border, sync_pos, blank_width, sync_width;
 174
 175         /* keep the hsync and hblank widths constant */
 176         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 177         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 178         sync_pos = (blank_width - sync_width + 1) / 2;
 179
 180         border = (mode->hdisplay - width + 1) / 2;
 181         border += border & 1; /* make the border even */
 182
 183         mode->crtc_hdisplay = width;
 184         mode->crtc_hblank_start = width + border;
 185         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 186
 187         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 188         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 189 }
 190
 191 static void
 192 centre_vertically(struct drm_display_mode *mode,
 193                   int height)
 194 {
 195         u32 border, sync_pos, blank_width, sync_width;
 196
 197         /* keep the vsync and vblank widths constant */
 198         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 199         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 200         sync_pos = (blank_width - sync_width + 1) / 2;
 201
 202         border = (mode->vdisplay - height + 1) / 2;
 203
 204         mode->crtc_vdisplay = height;
 205         mode->crtc_vblank_start = height + border;
 206         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 207
 208         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 209         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 210 }
 211
 212 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 213 {
 214         /*
 215          * Floating point operation is not supported. So the FACTOR
 216          * is defined, which can avoid the floating point computation
 217          * when calculating the panel ratio.
 218          */
 219 #define ACCURACY 12
 220 #define FACTOR (1 << ACCURACY)
 221         u32 ratio = source * FACTOR / target;
 222         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 223 }
 224
 225 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 226                                   struct drm_display_mode *mode,
 227                                   struct drm_display_mode *adjusted_mode)
 228 {
 229         struct drm_device *dev = encoder->dev;
 230         struct drm_i915_private *dev_priv = dev->dev_private;
 231         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 232         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 233         struct drm_encoder *tmp_encoder;
 234         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 235
 236         /* Should never happen!! */
 237         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 238                 DRM_ERROR("Can't support LVDS on pipe A\n");
 239                 return false;
 240         }
 241
 242         /* Should never happen!! */
 243         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 244                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
 245                         DRM_ERROR("Can't enable LVDS and another "
 246                                "encoder on the same pipe\n");
 247                         return false;
 248                 }
 249         }
 250
 251         /*
 252          * We have timings from the BIOS for the panel, put them in
 253          * to the adjusted mode.  The CRTC will be set up for this mode,
 254          * with the panel scaling set up to source from the H/VDisplay
 255          * of the original mode.
 256          */
 257         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
 258
 259         if (HAS_PCH_SPLIT(dev)) {
 260                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
 261                                         mode, adjusted_mode);
 262                 return true;
 263         }
 264
 265         /* Make sure pre-965s set dither correctly */
 266         if (INTEL_INFO(dev)->gen < 4) {
 267                 if (dev_priv->lvds_dither)
 268                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 269         }
 270
 271         /* Native modes don't need fitting */
 272         if (adjusted_mode->hdisplay == mode->hdisplay &&
 273             adjusted_mode->vdisplay == mode->vdisplay)
 274                 goto out;
 275
 276         /* 965+ wants fuzzy fitting */
 277         if (INTEL_INFO(dev)->gen >= 4)
 278                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 279                                  PFIT_FILTER_FUZZY);
 280
 281         /*
 282          * Enable automatic panel scaling for non-native modes so that they fill
 283          * the screen.  Should be enabled before the pipe is enabled, according
 284          * to register description and PRM.
 285          * Change the value here to see the borders for debugging
 286          */
 287         I915_WRITE(BCLRPAT_A, 0);
 288         I915_WRITE(BCLRPAT_B, 0);
 289
 290         switch (intel_lvds->fitting_mode) {
 291         case DRM_MODE_SCALE_CENTER:
 292                 /*
 293                  * For centered modes, we have to calculate border widths &
 294                  * heights and modify the values programmed into the CRTC.
 295                  */
 296                 centre_horizontally(adjusted_mode, mode->hdisplay);
 297                 centre_vertically(adjusted_mode, mode->vdisplay);
 298                 border = LVDS_BORDER_ENABLE;
 299                 break;
 300
 301         case DRM_MODE_SCALE_ASPECT:
 302                 /* Scale but preserve the aspect ratio */
 303                 if (INTEL_INFO(dev)->gen >= 4) {
 304                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 305                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 306
 307                         /* 965+ is easy, it does everything in hw */
 308                         if (scaled_width > scaled_height)
 309                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 310                         else if (scaled_width < scaled_height)
 311                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 312                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 313                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 314                 } else {
 315                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 316                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 317                         /*
 318                          * For earlier chips we have to calculate the scaling
 319                          * ratio by hand and program it into the
 320                          * PFIT_PGM_RATIO register
 321                          */
 322                         if (scaled_width > scaled_height) { /* pillar */
 323                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 324
 325                                 border = LVDS_BORDER_ENABLE;
 326                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 327                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 328                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 329                                                             bits << PFIT_VERT_SCALE_SHIFT);
 330                                         pfit_control |= (PFIT_ENABLE |
 331                                                          VERT_INTERP_BILINEAR |
 332                                                          HORIZ_INTERP_BILINEAR);
 333                                 }
 334                         } else if (scaled_width < scaled_height) { /* letter */
 335                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 336
 337                                 border = LVDS_BORDER_ENABLE;
 338                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 339                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 340                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 341                                                             bits << PFIT_VERT_SCALE_SHIFT);
 342                                         pfit_control |= (PFIT_ENABLE |
 343                                                          VERT_INTERP_BILINEAR |
 344                                                          HORIZ_INTERP_BILINEAR);
 345                                 }
 346                         } else
 347                                 /* Aspects match, Let hw scale both directions */
 348                                 pfit_control |= (PFIT_ENABLE |
 349                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 350                                                  VERT_INTERP_BILINEAR |
 351                                                  HORIZ_INTERP_BILINEAR);
 352                 }
 353                 break;
 354
 355         case DRM_MODE_SCALE_FULLSCREEN:
 356                 /*
 357                  * Full scaling, even if it changes the aspect ratio.
 358                  * Fortunately this is all done for us in hw.
 359                  */
 360                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 361                     mode->hdisplay != adjusted_mode->hdisplay) {
 362                         pfit_control |= PFIT_ENABLE;
 363                         if (INTEL_INFO(dev)->gen >= 4)
 364                                 pfit_control |= PFIT_SCALING_AUTO;
 365                         else
 366                                 pfit_control |= (VERT_AUTO_SCALE |
 367                                                  VERT_INTERP_BILINEAR |
 368                                                  HORIZ_AUTO_SCALE |
 369                                                  HORIZ_INTERP_BILINEAR);
 370                 }
 371                 break;
 372
 373         default:
 374                 break;
 375         }
 376
 377 out:
 378         if (pfit_control != intel_lvds->pfit_control ||
 379             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
 380                 intel_lvds->pfit_control = pfit_control;
 381                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
 382                 intel_lvds->pfit_dirty = true;
 383         }
 384         dev_priv->lvds_border_bits = border;
 385
 386         /*
 387          * XXX: It would be nice to support lower refresh rates on the
 388          * panels to reduce power consumption, and perhaps match the
 389          * user's requested refresh rate.
 390          */
 391
 392         return true;
 393 }
 394
 395 static void intel_lvds_prepare(struct drm_encoder *encoder)
 396 {
 397         struct drm_device *dev = encoder->dev;
 398         struct drm_i915_private *dev_priv = dev->dev_private;
 399         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 400
 401         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 402
 403         /* We try to do the minimum that is necessary in order to unlock
 404          * the registers for mode setting.
 405          *
 406          * On Ironlake, this is quite simple as we just set the unlock key
 407          * and ignore all subtleties. (This may cause some issues...)
 408          *
 409          * Prior to Ironlake, we must disable the pipe if we want to adjust
 410          * the panel fitter. However at all other times we can just reset
 411          * the registers regardless.
 412          */
 413
 414         if (HAS_PCH_SPLIT(dev)) {
 415                 I915_WRITE(PCH_PP_CONTROL,
 416                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
 417         } else if (intel_lvds->pfit_dirty) {
 418                 I915_WRITE(PP_CONTROL,
 419                            (I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS)
 420                            & ~POWER_TARGET_ON);
 421         } else {
 422                 I915_WRITE(PP_CONTROL,
 423                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
 424         }
 425 }
 426
 427 static void intel_lvds_commit(struct drm_encoder *encoder)
 428 {
 429         struct drm_device *dev = encoder->dev;
 430         struct drm_i915_private *dev_priv = dev->dev_private;
 431         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 432
 433         if (dev_priv->backlight_level == 0)
 434                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 435
 436         /* Undo any unlocking done in prepare to prevent accidental
 437          * adjustment of the registers.
 438          */
 439         if (HAS_PCH_SPLIT(dev)) {
 440                 u32 val = I915_READ(PCH_PP_CONTROL);
 441                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
 442                         I915_WRITE(PCH_PP_CONTROL, val & 0x3);
 443         } else {
 444                 u32 val = I915_READ(PP_CONTROL);
 445                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
 446                         I915_WRITE(PP_CONTROL, val & 0x3);
 447         }
 448
 449         /* Always do a full power on as we do not know what state
 450          * we were left in.
 451          */
 452         intel_lvds_enable(intel_lvds);
 453 }
 454
 455 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 456                                 struct drm_display_mode *mode,
 457                                 struct drm_display_mode *adjusted_mode)
 458 {
 459         /*
 460          * The LVDS pin pair will already have been turned on in the
 461          * intel_crtc_mode_set since it has a large impact on the DPLL
 462          * settings.
 463          */
 464 }
 465
 466 /**
 467  * Detect the LVDS connection.
 468  *
 469  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 470  * connected and closed means disconnected.  We also send hotplug events as
 471  * needed, using lid status notification from the input layer.
 472  */
 473 static enum drm_connector_status
 474 intel_lvds_detect(struct drm_connector *connector, bool force)
 475 {
 476         struct drm_device *dev = connector->dev;
 477         enum drm_connector_status status = connector_status_connected;
 478
 479         /* ACPI lid methods were generally unreliable in this generation, so
 480          * don't even bother.
 481          */
 482         if (IS_GEN2(dev) || IS_GEN3(dev))
 483                 return connector_status_connected;
 484
 485         return status;
 486 }
 487
 488 /**
 489  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 490  */
 491 static int intel_lvds_get_modes(struct drm_connector *connector)
 492 {
 493         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 494         struct drm_device *dev = connector->dev;
 495         struct drm_display_mode *mode;
 496
 497         if (intel_lvds->edid)
 498                 return drm_add_edid_modes(connector, intel_lvds->edid);
 499
 500         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
 501         if (mode == 0)
 502                 return 0;
 503
 504         drm_mode_probed_add(connector, mode);
 505         return 1;
 506 }
 507
 508 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 509 {
 510         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
 511         return 1;
 512 }
 513
 514 /* The GPU hangs up on these systems if modeset is performed on LID open */
 515 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 516         {
 517                 .callback = intel_no_modeset_on_lid_dmi_callback,
 518                 .ident = "Toshiba Tecra A11",
 519                 .matches = {
 520                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 521                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 522                 },
 523         },
 524
 525         { }     /* terminating entry */
 526 };
 527
 528 /*
 529  * Lid events. Note the use of 'modeset_on_lid':
 530  *  - we set it on lid close, and reset it on open
 531  *  - we use it as a "only once" bit (ie we ignore
 532  *    duplicate events where it was already properly
 533  *    set/reset)
 534  *  - the suspend/resume paths will also set it to
 535  *    zero, since they restore the mode ("lid open").
 536  */
 537 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 538                             void *unused)
 539 {
 540         struct drm_i915_private *dev_priv =
 541                 container_of(nb, struct drm_i915_private, lid_notifier);
 542         struct drm_device *dev = dev_priv->dev;
 543         struct drm_connector *connector = dev_priv->int_lvds_connector;
 544
 545         /*
 546          * check and update the status of LVDS connector after receiving
 547          * the LID nofication event.
 548          */
 549         if (connector)
 550                 connector->status = connector->funcs->detect(connector,
 551                                                              false);
 552
 553         /* Don't force modeset on machines where it causes a GPU lockup */
 554         if (dmi_check_system(intel_no_modeset_on_lid))
 555                 return NOTIFY_OK;
 556         if (!acpi_lid_open()) {
 557                 dev_priv->modeset_on_lid = 1;
 558                 return NOTIFY_OK;
 559         }
 560
 561         if (!dev_priv->modeset_on_lid)
 562                 return NOTIFY_OK;
 563
 564         dev_priv->modeset_on_lid = 0;
 565
 566         mutex_lock(&dev->mode_config.mutex);
 567         drm_helper_resume_force_mode(dev);
 568         mutex_unlock(&dev->mode_config.mutex);
 569
 570         return NOTIFY_OK;
 571 }
 572
 573 /**
 574  * intel_lvds_destroy - unregister and free LVDS structures
 575  * @connector: connector to free
 576  *
 577  * Unregister the DDC bus for this connector then free the driver private
 578  * structure.
 579  */
 580 static void intel_lvds_destroy(struct drm_connector *connector)
 581 {
 582         struct drm_device *dev = connector->dev;
 583         struct drm_i915_private *dev_priv = dev->dev_private;
 584
 585         if (dev_priv->lid_notifier.notifier_call)
 586                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 587         drm_sysfs_connector_remove(connector);
 588         drm_connector_cleanup(connector);
 589         kfree(connector);
 590 }
 591
 592 static int intel_lvds_set_property(struct drm_connector *connector,
 593                                    struct drm_property *property,
 594                                    uint64_t value)
 595 {
 596         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 597         struct drm_device *dev = connector->dev;
 598
 599         if (property == dev->mode_config.scaling_mode_property) {
 600                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
 601
 602                 if (value == DRM_MODE_SCALE_NONE) {
 603                         DRM_DEBUG_KMS("no scaling not supported\n");
 604                         return -EINVAL;
 605                 }
 606
 607                 if (intel_lvds->fitting_mode == value) {
 608                         /* the LVDS scaling property is not changed */
 609                         return 0;
 610                 }
 611                 intel_lvds->fitting_mode = value;
 612                 if (crtc && crtc->enabled) {
 613                         /*
 614                          * If the CRTC is enabled, the display will be changed
 615                          * according to the new panel fitting mode.
 616                          */
 617                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
 618                                 crtc->x, crtc->y, crtc->fb);
 619                 }
 620         }
 621
 622         return 0;
 623 }
 624
 625 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 626         .dpms = intel_lvds_dpms,
 627         .mode_fixup = intel_lvds_mode_fixup,
 628         .prepare = intel_lvds_prepare,
 629         .mode_set = intel_lvds_mode_set,
 630         .commit = intel_lvds_commit,
 631 };
 632
 633 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 634         .get_modes = intel_lvds_get_modes,
 635         .mode_valid = intel_lvds_mode_valid,
 636         .best_encoder = intel_best_encoder,
 637 };
 638
 639 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 640         .dpms = drm_helper_connector_dpms,
 641         .detect = intel_lvds_detect,
 642         .fill_modes = drm_helper_probe_single_connector_modes,
 643         .set_property = intel_lvds_set_property,
 644         .destroy = intel_lvds_destroy,
 645 };
 646
 647 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 648         .destroy = intel_encoder_destroy,
 649 };
 650
 651 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 652 {
 653         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
 654         return 1;
 655 }
 656
 657 /* These systems claim to have LVDS, but really don't */
 658 static const struct dmi_system_id intel_no_lvds[] = {
 659         {
 660                 .callback = intel_no_lvds_dmi_callback,
 661                 .ident = "Apple Mac Mini (Core series)",
 662                 .matches = {
 663                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 664                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 665                 },
 666         },
 667         {
 668                 .callback = intel_no_lvds_dmi_callback,
 669                 .ident = "Apple Mac Mini (Core 2 series)",
 670                 .matches = {
 671                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 672                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 673                 },
 674         },
 675         {
 676                 .callback = intel_no_lvds_dmi_callback,
 677                 .ident = "MSI IM-945GSE-A",
 678                 .matches = {
 679                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 680                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 681                 },
 682         },
 683         {
 684                 .callback = intel_no_lvds_dmi_callback,
 685                 .ident = "Dell Studio Hybrid",
 686                 .matches = {
 687                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 688                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 689                 },
 690         },
 691         {
 692                 .callback = intel_no_lvds_dmi_callback,
 693                 .ident = "AOpen Mini PC",
 694                 .matches = {
 695                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 696                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 697                 },
 698         },
 699         {
 700                 .callback = intel_no_lvds_dmi_callback,
 701                 .ident = "AOpen Mini PC MP915",
 702                 .matches = {
 703                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 704                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 705                 },
 706         },
 707         {
 708                 .callback = intel_no_lvds_dmi_callback,
 709                 .ident = "Aopen i945GTt-VFA",
 710                 .matches = {
 711                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 712                 },
 713         },
 714         {
 715                 .callback = intel_no_lvds_dmi_callback,
 716                 .ident = "Clientron U800",
 717                 .matches = {
 718                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 719                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 720                 },
 721         },
 722
 723         { }     /* terminating entry */
 724 };
 725
 726 /**
 727  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 728  * @dev: drm device
 729  * @connector: LVDS connector
 730  *
 731  * Find the reduced downclock for LVDS in EDID.
 732  */
 733 static void intel_find_lvds_downclock(struct drm_device *dev,
 734                                       struct drm_display_mode *fixed_mode,
 735                                       struct drm_connector *connector)
 736 {
 737         struct drm_i915_private *dev_priv = dev->dev_private;
 738         struct drm_display_mode *scan;
 739         int temp_downclock;
 740
 741         temp_downclock = fixed_mode->clock;
 742         list_for_each_entry(scan, &connector->probed_modes, head) {
 743                 /*
 744                  * If one mode has the same resolution with the fixed_panel
 745                  * mode while they have the different refresh rate, it means
 746                  * that the reduced downclock is found for the LVDS. In such
 747                  * case we can set the different FPx0/1 to dynamically select
 748                  * between low and high frequency.
 749                  */
 750                 if (scan->hdisplay == fixed_mode->hdisplay &&
 751                     scan->hsync_start == fixed_mode->hsync_start &&
 752                     scan->hsync_end == fixed_mode->hsync_end &&
 753                     scan->htotal == fixed_mode->htotal &&
 754                     scan->vdisplay == fixed_mode->vdisplay &&
 755                     scan->vsync_start == fixed_mode->vsync_start &&
 756                     scan->vsync_end == fixed_mode->vsync_end &&
 757                     scan->vtotal == fixed_mode->vtotal) {
 758                         if (scan->clock < temp_downclock) {
 759                                 /*
 760                                  * The downclock is already found. But we
 761                                  * expect to find the lower downclock.
 762                                  */
 763                                 temp_downclock = scan->clock;
 764                         }
 765                 }
 766         }
 767         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 768                 /* We found the downclock for LVDS. */
 769                 dev_priv->lvds_downclock_avail = 1;
 770                 dev_priv->lvds_downclock = temp_downclock;
 771                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 772                               "Normal clock %dKhz, downclock %dKhz\n",
 773                               fixed_mode->clock, temp_downclock);
 774         }
 775 }
 776
 777 /*
 778  * Enumerate the child dev array parsed from VBT to check whether
 779  * the LVDS is present.
 780  * If it is present, return 1.
 781  * If it is not present, return false.
 782  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 783  */
 784 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 785                                    u8 *i2c_pin)
 786 {
 787         struct drm_i915_private *dev_priv = dev->dev_private;
 788         int i;
 789
 790         if (!dev_priv->child_dev_num)
 791                 return true;
 792
 793         for (i = 0; i < dev_priv->child_dev_num; i++) {
 794                 struct child_device_config *child = dev_priv->child_dev + i;
 795
 796                 /* If the device type is not LFP, continue.
 797                  * We have to check both the new identifiers as well as the
 798                  * old for compatibility with some BIOSes.
 799                  */
 800                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 801                     child->device_type != DEVICE_TYPE_LFP)
 802                         continue;
 803
 804                 if (child->i2c_pin)
 805                     *i2c_pin = child->i2c_pin;
 806
 807                 /* However, we cannot trust the BIOS writers to populate
 808                  * the VBT correctly.  Since LVDS requires additional
 809                  * information from AIM blocks, a non-zero addin offset is
 810                  * a good indicator that the LVDS is actually present.
 811                  */
 812                 if (child->addin_offset)
 813                         return true;
 814
 815                 /* But even then some BIOS writers perform some black magic
 816                  * and instantiate the device without reference to any
 817                  * additional data.  Trust that if the VBT was written into
 818                  * the OpRegion then they have validated the LVDS's existence.
 819                  */
 820                 if (dev_priv->opregion.vbt)
 821                         return true;
 822         }
 823
 824         return false;
 825 }
 826
 827 static bool intel_lvds_ddc_probe(struct drm_device *dev, u8 pin)
 828 {
 829         struct drm_i915_private *dev_priv = dev->dev_private;
 830         u8 buf = 0;
 831         struct i2c_msg msgs[] = {
 832                 {
 833                         .addr = 0xA0,
 834                         .flags = 0,
 835                         .len = 1,
 836                         .buf = &buf,
 837                 },
 838         };
 839         struct i2c_adapter *i2c = &dev_priv->gmbus[pin].adapter;
 840         /* XXX this only appears to work when using GMBUS */
 841         if (intel_gmbus_is_forced_bit(i2c))
 842                 return true;
 843         return i2c_transfer(i2c, msgs, 1) == 1;
 844 }
 845
 846 /**
 847  * intel_lvds_init - setup LVDS connectors on this device
 848  * @dev: drm device
 849  *
 850  * Create the connector, register the LVDS DDC bus, and try to figure out what
 851  * modes we can display on the LVDS panel (if present).
 852  */
 853 bool intel_lvds_init(struct drm_device *dev)
 854 {
 855         struct drm_i915_private *dev_priv = dev->dev_private;
 856         struct intel_lvds *intel_lvds;
 857         struct intel_encoder *intel_encoder;
 858         struct intel_connector *intel_connector;
 859         struct drm_connector *connector;
 860         struct drm_encoder *encoder;
 861         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 862         struct drm_crtc *crtc;
 863         u32 lvds;
 864         int pipe;
 865         u8 pin;
 866
 867         /* Skip init on machines we know falsely report LVDS */
 868         if (dmi_check_system(intel_no_lvds))
 869                 return false;
 870
 871         pin = GMBUS_PORT_PANEL;
 872         if (!lvds_is_present_in_vbt(dev, &pin)) {
 873                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 874                 return false;
 875         }
 876
 877         if (HAS_PCH_SPLIT(dev)) {
 878                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 879                         return false;
 880                 if (dev_priv->edp.support) {
 881                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 882                         return false;
 883                 }
 884         }
 885
 886         if (!intel_lvds_ddc_probe(dev, pin)) {
 887                 DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
 888                 return false;
 889         }
 890
 891         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
 892         if (!intel_lvds) {
 893                 return false;
 894         }
 895
 896         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 897         if (!intel_connector) {
 898                 kfree(intel_lvds);
 899                 return false;
 900         }
 901
 902         if (!HAS_PCH_SPLIT(dev)) {
 903                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
 904         }
 905
 906         intel_encoder = &intel_lvds->base;
 907         encoder = &intel_encoder->base;
 908         connector = &intel_connector->base;
 909         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 910                            DRM_MODE_CONNECTOR_LVDS);
 911
 912         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 913                          DRM_MODE_ENCODER_LVDS);
 914
 915         intel_connector_attach_encoder(intel_connector, intel_encoder);
 916         intel_encoder->type = INTEL_OUTPUT_LVDS;
 917
 918         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
 919         intel_encoder->crtc_mask = (1 << 1);
 920         if (INTEL_INFO(dev)->gen >= 5)
 921                 intel_encoder->crtc_mask |= (1 << 0);
 922         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 923         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 924         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 925         connector->interlace_allowed = false;
 926         connector->doublescan_allowed = false;
 927
 928         /* create the scaling mode property */
 929         drm_mode_create_scaling_mode_property(dev);
 930         /*
 931          * the initial panel fitting mode will be FULL_SCREEN.
 932          */
 933
 934         drm_connector_attach_property(&intel_connector->base,
 935                                       dev->mode_config.scaling_mode_property,
 936                                       DRM_MODE_SCALE_ASPECT);
 937         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
 938         /*
 939          * LVDS discovery:
 940          * 1) check for EDID on DDC
 941          * 2) check for VBT data
 942          * 3) check to see if LVDS is already on
 943          *    if none of the above, no panel
 944          * 4) make sure lid is open
 945          *    if closed, act like it's not there for now
 946          */
 947
 948         /*
 949          * Attempt to get the fixed panel mode from DDC.  Assume that the
 950          * preferred mode is the right one.
 951          */
 952         intel_lvds->edid = drm_get_edid(connector,
 953                                         &dev_priv->gmbus[pin].adapter);
 954         if (intel_lvds->edid) {
 955                 if (drm_add_edid_modes(connector,
 956                                        intel_lvds->edid)) {
 957                         drm_mode_connector_update_edid_property(connector,
 958                                                                 intel_lvds->edid);
 959                 } else {
 960                         kfree(intel_lvds->edid);
 961                         intel_lvds->edid = NULL;
 962                 }
 963         }
 964         if (!intel_lvds->edid) {
 965                 /* Didn't get an EDID, so
 966                  * Set wide sync ranges so we get all modes
 967                  * handed to valid_mode for checking
 968                  */
 969                 connector->display_info.min_vfreq = 0;
 970                 connector->display_info.max_vfreq = 200;
 971                 connector->display_info.min_hfreq = 0;
 972                 connector->display_info.max_hfreq = 200;
 973         }
 974
 975         list_for_each_entry(scan, &connector->probed_modes, head) {
 976                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 977                         intel_lvds->fixed_mode =
 978                                 drm_mode_duplicate(dev, scan);
 979                         intel_find_lvds_downclock(dev,
 980                                                   intel_lvds->fixed_mode,
 981                                                   connector);
 982                         goto out;
 983                 }
 984         }
 985
 986         /* Failed to get EDID, what about VBT? */
 987         if (dev_priv->lfp_lvds_vbt_mode) {
 988                 intel_lvds->fixed_mode =
 989                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 990                 if (intel_lvds->fixed_mode) {
 991                         intel_lvds->fixed_mode->type |=
 992                                 DRM_MODE_TYPE_PREFERRED;
 993                         goto out;
 994                 }
 995         }
 996
 997         /*
 998          * If we didn't get EDID, try checking if the panel is already turned
 999          * on.  If so, assume that whatever is currently programmed is the
1000          * correct mode.
1001          */
1002
1003         /* Ironlake: FIXME if still fail, not try pipe mode now */
1004         if (HAS_PCH_SPLIT(dev))
1005                 goto failed;
1006
1007         lvds = I915_READ(LVDS);
1008         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1009         crtc = intel_get_crtc_for_pipe(dev, pipe);
1010
1011         if (crtc && (lvds & LVDS_PORT_EN)) {
1012                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1013                 if (intel_lvds->fixed_mode) {
1014                         intel_lvds->fixed_mode->type |=
1015                                 DRM_MODE_TYPE_PREFERRED;
1016                         goto out;
1017                 }
1018         }
1019
1020         /* If we still don't have a mode after all that, give up. */
1021         if (!intel_lvds->fixed_mode)
1022                 goto failed;
1023
1024 out:
1025         if (HAS_PCH_SPLIT(dev)) {
1026                 u32 pwm;
1027
1028                 pipe = (I915_READ(PCH_LVDS) & LVDS_PIPEB_SELECT) ? 1 : 0;
1029
1030                 /* make sure PWM is enabled and locked to the LVDS pipe */
1031                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1032                 if (pipe == 0 && (pwm & PWM_PIPE_B))
1033                         I915_WRITE(BLC_PWM_CPU_CTL2, pwm & ~PWM_ENABLE);
1034                 if (pipe)
1035                         pwm |= PWM_PIPE_B;
1036                 else
1037                         pwm &= ~PWM_PIPE_B;
1038                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm | PWM_ENABLE);
1039
1040                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1041                 pwm |= PWM_PCH_ENABLE;
1042                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1043         }
1044         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1045         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1046                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1047                 dev_priv->lid_notifier.notifier_call = NULL;
1048         }
1049         /* keep the LVDS connector */
1050         dev_priv->int_lvds_connector = connector;
1051         drm_sysfs_connector_add(connector);
1052         return true;
1053
1054 failed:
1055         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1056         drm_connector_cleanup(connector);
1057         drm_encoder_cleanup(encoder);
1058         kfree(intel_lvds);
1059         kfree(intel_connector);
1060         return false;
1061 }