drivers/gpu/drm/i915/intel_lvds.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  */
  29
  30 #include <acpi/button.h>
  31 #include <linux/dmi.h>
  32 #include <linux/i2c.h>
  33 #include <linux/slab.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_crtc.h>
  36 #include <drm/drm_edid.h>
  37 #include "intel_drv.h"
  38 #include <drm/i915_drm.h>
  39 #include "i915_drv.h"
  40 #include <linux/acpi.h>
  41
  42 /* Private structure for the integrated LVDS support */
  43 struct intel_lvds_connector {
  44         struct intel_connector base;
  45
  46         struct notifier_block lid_notifier;
  47 };
  48
  49 struct intel_lvds_encoder {
  50         struct intel_encoder base;
  51
  52         struct edid *edid;
  53
  54         int fitting_mode;
  55         u32 pfit_control;
  56         u32 pfit_pgm_ratios;
  57         bool pfit_dirty;
  58
  59         struct drm_display_mode *fixed_mode;
  60 };
  61
  62 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  63 {
  64         return container_of(encoder, struct intel_lvds_encoder, base.base);
  65 }
  66
  67 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  68 {
  69         return container_of(connector, struct intel_lvds_connector, base.base);
  70 }
  71
  72 static struct intel_lvds_encoder *intel_attached_lvds(struct drm_connector *connector)
  73 {
  74         return container_of(intel_attached_encoder(connector),
  75                             struct intel_lvds_encoder, base);
  76 }
  77
  78 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  79                                     enum pipe *pipe)
  80 {
  81         struct drm_device *dev = encoder->base.dev;
  82         struct drm_i915_private *dev_priv = dev->dev_private;
  83         u32 lvds_reg, tmp;
  84
  85         if (HAS_PCH_SPLIT(dev)) {
  86                 lvds_reg = PCH_LVDS;
  87         } else {
  88                 lvds_reg = LVDS;
  89         }
  90
  91         tmp = I915_READ(lvds_reg);
  92
  93         if (!(tmp & LVDS_PORT_EN))
  94                 return false;
  95
  96         if (HAS_PCH_CPT(dev))
  97                 *pipe = PORT_TO_PIPE_CPT(tmp);
  98         else
  99                 *pipe = PORT_TO_PIPE(tmp);
 100
 101         return true;
 102 }
 103
 104 /**
 105  * Sets the power state for the panel.
 106  */
 107 static void intel_enable_lvds(struct intel_encoder *encoder)
 108 {
 109         struct drm_device *dev = encoder->base.dev;
 110         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 111         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 112         struct drm_i915_private *dev_priv = dev->dev_private;
 113         u32 ctl_reg, lvds_reg, stat_reg;
 114
 115         if (HAS_PCH_SPLIT(dev)) {
 116                 ctl_reg = PCH_PP_CONTROL;
 117                 lvds_reg = PCH_LVDS;
 118                 stat_reg = PCH_PP_STATUS;
 119         } else {
 120                 ctl_reg = PP_CONTROL;
 121                 lvds_reg = LVDS;
 122                 stat_reg = PP_STATUS;
 123         }
 124
 125         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
 126
 127         if (lvds_encoder->pfit_dirty) {
 128                 /*
 129                  * Enable automatic panel scaling so that non-native modes
 130                  * fill the screen.  The panel fitter should only be
 131                  * adjusted whilst the pipe is disabled, according to
 132                  * register description and PRM.
 133                  */
 134                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
 135                               lvds_encoder->pfit_control,
 136                               lvds_encoder->pfit_pgm_ratios);
 137
 138                 I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
 139                 I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
 140                 lvds_encoder->pfit_dirty = false;
 141         }
 142
 143         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 144         POSTING_READ(lvds_reg);
 145         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 146                 DRM_ERROR("timed out waiting for panel to power on\n");
 147
 148         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 149 }
 150
 151 static void intel_disable_lvds(struct intel_encoder *encoder)
 152 {
 153         struct drm_device *dev = encoder->base.dev;
 154         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 155         struct drm_i915_private *dev_priv = dev->dev_private;
 156         u32 ctl_reg, lvds_reg, stat_reg;
 157
 158         if (HAS_PCH_SPLIT(dev)) {
 159                 ctl_reg = PCH_PP_CONTROL;
 160                 lvds_reg = PCH_LVDS;
 161                 stat_reg = PCH_PP_STATUS;
 162         } else {
 163                 ctl_reg = PP_CONTROL;
 164                 lvds_reg = LVDS;
 165                 stat_reg = PP_STATUS;
 166         }
 167
 168         intel_panel_disable_backlight(dev);
 169
 170         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 171         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 172                 DRM_ERROR("timed out waiting for panel to power off\n");
 173
 174         if (lvds_encoder->pfit_control) {
 175                 I915_WRITE(PFIT_CONTROL, 0);
 176                 lvds_encoder->pfit_dirty = true;
 177         }
 178
 179         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 180         POSTING_READ(lvds_reg);
 181 }
 182
 183 static int intel_lvds_mode_valid(struct drm_connector *connector,
 184                                  struct drm_display_mode *mode)
 185 {
 186         struct intel_lvds_encoder *lvds_encoder = intel_attached_lvds(connector);
 187         struct drm_display_mode *fixed_mode = lvds_encoder->fixed_mode;
 188
 189         if (mode->hdisplay > fixed_mode->hdisplay)
 190                 return MODE_PANEL;
 191         if (mode->vdisplay > fixed_mode->vdisplay)
 192                 return MODE_PANEL;
 193
 194         return MODE_OK;
 195 }
 196
 197 static void
 198 centre_horizontally(struct drm_display_mode *mode,
 199                     int width)
 200 {
 201         u32 border, sync_pos, blank_width, sync_width;
 202
 203         /* keep the hsync and hblank widths constant */
 204         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 205         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 206         sync_pos = (blank_width - sync_width + 1) / 2;
 207
 208         border = (mode->hdisplay - width + 1) / 2;
 209         border += border & 1; /* make the border even */
 210
 211         mode->crtc_hdisplay = width;
 212         mode->crtc_hblank_start = width + border;
 213         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 214
 215         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 216         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 217
 218         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 219 }
 220
 221 static void
 222 centre_vertically(struct drm_display_mode *mode,
 223                   int height)
 224 {
 225         u32 border, sync_pos, blank_width, sync_width;
 226
 227         /* keep the vsync and vblank widths constant */
 228         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 229         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 230         sync_pos = (blank_width - sync_width + 1) / 2;
 231
 232         border = (mode->vdisplay - height + 1) / 2;
 233
 234         mode->crtc_vdisplay = height;
 235         mode->crtc_vblank_start = height + border;
 236         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 237
 238         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 239         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 240
 241         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
 242 }
 243
 244 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 245 {
 246         /*
 247          * Floating point operation is not supported. So the FACTOR
 248          * is defined, which can avoid the floating point computation
 249          * when calculating the panel ratio.
 250          */
 251 #define ACCURACY 12
 252 #define FACTOR (1 << ACCURACY)
 253         u32 ratio = source * FACTOR / target;
 254         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 255 }
 256
 257 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 258                                   const struct drm_display_mode *mode,
 259                                   struct drm_display_mode *adjusted_mode)
 260 {
 261         struct drm_device *dev = encoder->dev;
 262         struct drm_i915_private *dev_priv = dev->dev_private;
 263         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(encoder);
 264         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 265         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 266         int pipe;
 267
 268         /* Should never happen!! */
 269         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 270                 DRM_ERROR("Can't support LVDS on pipe A\n");
 271                 return false;
 272         }
 273
 274         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
 275                 return false;
 276
 277         /*
 278          * We have timings from the BIOS for the panel, put them in
 279          * to the adjusted mode.  The CRTC will be set up for this mode,
 280          * with the panel scaling set up to source from the H/VDisplay
 281          * of the original mode.
 282          */
 283         intel_fixed_panel_mode(lvds_encoder->fixed_mode, adjusted_mode);
 284
 285         if (HAS_PCH_SPLIT(dev)) {
 286                 intel_pch_panel_fitting(dev, lvds_encoder->fitting_mode,
 287                                         mode, adjusted_mode);
 288                 return true;
 289         }
 290
 291         /* Native modes don't need fitting */
 292         if (adjusted_mode->hdisplay == mode->hdisplay &&
 293             adjusted_mode->vdisplay == mode->vdisplay)
 294                 goto out;
 295
 296         /* 965+ wants fuzzy fitting */
 297         if (INTEL_INFO(dev)->gen >= 4)
 298                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 299                                  PFIT_FILTER_FUZZY);
 300
 301         /*
 302          * Enable automatic panel scaling for non-native modes so that they fill
 303          * the screen.  Should be enabled before the pipe is enabled, according
 304          * to register description and PRM.
 305          * Change the value here to see the borders for debugging
 306          */
 307         for_each_pipe(pipe)
 308                 I915_WRITE(BCLRPAT(pipe), 0);
 309
 310         drm_mode_set_crtcinfo(adjusted_mode, 0);
 311
 312         switch (lvds_encoder->fitting_mode) {
 313         case DRM_MODE_SCALE_CENTER:
 314                 /*
 315                  * For centered modes, we have to calculate border widths &
 316                  * heights and modify the values programmed into the CRTC.
 317                  */
 318                 centre_horizontally(adjusted_mode, mode->hdisplay);
 319                 centre_vertically(adjusted_mode, mode->vdisplay);
 320                 border = LVDS_BORDER_ENABLE;
 321                 break;
 322
 323         case DRM_MODE_SCALE_ASPECT:
 324                 /* Scale but preserve the aspect ratio */
 325                 if (INTEL_INFO(dev)->gen >= 4) {
 326                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 327                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 328
 329                         /* 965+ is easy, it does everything in hw */
 330                         if (scaled_width > scaled_height)
 331                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 332                         else if (scaled_width < scaled_height)
 333                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 334                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 335                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 336                 } else {
 337                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 338                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 339                         /*
 340                          * For earlier chips we have to calculate the scaling
 341                          * ratio by hand and program it into the
 342                          * PFIT_PGM_RATIO register
 343                          */
 344                         if (scaled_width > scaled_height) { /* pillar */
 345                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 346
 347                                 border = LVDS_BORDER_ENABLE;
 348                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 349                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 350                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 351                                                             bits << PFIT_VERT_SCALE_SHIFT);
 352                                         pfit_control |= (PFIT_ENABLE |
 353                                                          VERT_INTERP_BILINEAR |
 354                                                          HORIZ_INTERP_BILINEAR);
 355                                 }
 356                         } else if (scaled_width < scaled_height) { /* letter */
 357                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 358
 359                                 border = LVDS_BORDER_ENABLE;
 360                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 361                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 362                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 363                                                             bits << PFIT_VERT_SCALE_SHIFT);
 364                                         pfit_control |= (PFIT_ENABLE |
 365                                                          VERT_INTERP_BILINEAR |
 366                                                          HORIZ_INTERP_BILINEAR);
 367                                 }
 368                         } else
 369                                 /* Aspects match, Let hw scale both directions */
 370                                 pfit_control |= (PFIT_ENABLE |
 371                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 372                                                  VERT_INTERP_BILINEAR |
 373                                                  HORIZ_INTERP_BILINEAR);
 374                 }
 375                 break;
 376
 377         case DRM_MODE_SCALE_FULLSCREEN:
 378                 /*
 379                  * Full scaling, even if it changes the aspect ratio.
 380                  * Fortunately this is all done for us in hw.
 381                  */
 382                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 383                     mode->hdisplay != adjusted_mode->hdisplay) {
 384                         pfit_control |= PFIT_ENABLE;
 385                         if (INTEL_INFO(dev)->gen >= 4)
 386                                 pfit_control |= PFIT_SCALING_AUTO;
 387                         else
 388                                 pfit_control |= (VERT_AUTO_SCALE |
 389                                                  VERT_INTERP_BILINEAR |
 390                                                  HORIZ_AUTO_SCALE |
 391                                                  HORIZ_INTERP_BILINEAR);
 392                 }
 393                 break;
 394
 395         default:
 396                 break;
 397         }
 398
 399 out:
 400         /* If not enabling scaling, be consistent and always use 0. */
 401         if ((pfit_control & PFIT_ENABLE) == 0) {
 402                 pfit_control = 0;
 403                 pfit_pgm_ratios = 0;
 404         }
 405
 406         /* Make sure pre-965 set dither correctly */
 407         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 408                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 409
 410         if (pfit_control != lvds_encoder->pfit_control ||
 411             pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
 412                 lvds_encoder->pfit_control = pfit_control;
 413                 lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
 414                 lvds_encoder->pfit_dirty = true;
 415         }
 416         dev_priv->lvds_border_bits = border;
 417
 418         /*
 419          * XXX: It would be nice to support lower refresh rates on the
 420          * panels to reduce power consumption, and perhaps match the
 421          * user's requested refresh rate.
 422          */
 423
 424         return true;
 425 }
 426
 427 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 428                                 struct drm_display_mode *mode,
 429                                 struct drm_display_mode *adjusted_mode)
 430 {
 431         /*
 432          * The LVDS pin pair will already have been turned on in the
 433          * intel_crtc_mode_set since it has a large impact on the DPLL
 434          * settings.
 435          */
 436 }
 437
 438 /**
 439  * Detect the LVDS connection.
 440  *
 441  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 442  * connected and closed means disconnected.  We also send hotplug events as
 443  * needed, using lid status notification from the input layer.
 444  */
 445 static enum drm_connector_status
 446 intel_lvds_detect(struct drm_connector *connector, bool force)
 447 {
 448         struct drm_device *dev = connector->dev;
 449         enum drm_connector_status status;
 450
 451         status = intel_panel_detect(dev);
 452         if (status != connector_status_unknown)
 453                 return status;
 454
 455         return connector_status_connected;
 456 }
 457
 458 /**
 459  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 460  */
 461 static int intel_lvds_get_modes(struct drm_connector *connector)
 462 {
 463         struct intel_lvds_encoder *lvds_encoder = intel_attached_lvds(connector);
 464         struct drm_device *dev = connector->dev;
 465         struct drm_display_mode *mode;
 466
 467         if (lvds_encoder->edid)
 468                 return drm_add_edid_modes(connector, lvds_encoder->edid);
 469
 470         mode = drm_mode_duplicate(dev, lvds_encoder->fixed_mode);
 471         if (mode == NULL)
 472                 return 0;
 473
 474         drm_mode_probed_add(connector, mode);
 475         return 1;
 476 }
 477
 478 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 479 {
 480         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 481         return 1;
 482 }
 483
 484 /* The GPU hangs up on these systems if modeset is performed on LID open */
 485 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 486         {
 487                 .callback = intel_no_modeset_on_lid_dmi_callback,
 488                 .ident = "Toshiba Tecra A11",
 489                 .matches = {
 490                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 491                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 492                 },
 493         },
 494
 495         { }     /* terminating entry */
 496 };
 497
 498 /*
 499  * Lid events. Note the use of 'modeset_on_lid':
 500  *  - we set it on lid close, and reset it on open
 501  *  - we use it as a "only once" bit (ie we ignore
 502  *    duplicate events where it was already properly
 503  *    set/reset)
 504  *  - the suspend/resume paths will also set it to
 505  *    zero, since they restore the mode ("lid open").
 506  */
 507 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 508                             void *unused)
 509 {
 510         struct intel_lvds_connector *lvds_connector =
 511                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 512         struct drm_connector *connector = &lvds_connector->base.base;
 513         struct drm_device *dev = connector->dev;
 514         struct drm_i915_private *dev_priv = dev->dev_private;
 515
 516         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 517                 return NOTIFY_OK;
 518
 519         /*
 520          * check and update the status of LVDS connector after receiving
 521          * the LID nofication event.
 522          */
 523         connector->status = connector->funcs->detect(connector, false);
 524
 525         /* Don't force modeset on machines where it causes a GPU lockup */
 526         if (dmi_check_system(intel_no_modeset_on_lid))
 527                 return NOTIFY_OK;
 528         if (!acpi_lid_open()) {
 529                 dev_priv->modeset_on_lid = 1;
 530                 return NOTIFY_OK;
 531         }
 532
 533         if (!dev_priv->modeset_on_lid)
 534                 return NOTIFY_OK;
 535
 536         dev_priv->modeset_on_lid = 0;
 537
 538         mutex_lock(&dev->mode_config.mutex);
 539         intel_modeset_check_state(dev);
 540         mutex_unlock(&dev->mode_config.mutex);
 541
 542         return NOTIFY_OK;
 543 }
 544
 545 /**
 546  * intel_lvds_destroy - unregister and free LVDS structures
 547  * @connector: connector to free
 548  *
 549  * Unregister the DDC bus for this connector then free the driver private
 550  * structure.
 551  */
 552 static void intel_lvds_destroy(struct drm_connector *connector)
 553 {
 554         struct intel_lvds_connector *lvds_connector =
 555                 to_lvds_connector(connector);
 556
 557         if (lvds_connector->lid_notifier.notifier_call)
 558                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 559
 560         intel_panel_destroy_backlight(connector->dev);
 561
 562         drm_sysfs_connector_remove(connector);
 563         drm_connector_cleanup(connector);
 564         kfree(connector);
 565 }
 566
 567 static int intel_lvds_set_property(struct drm_connector *connector,
 568                                    struct drm_property *property,
 569                                    uint64_t value)
 570 {
 571         struct intel_lvds_encoder *lvds_encoder = intel_attached_lvds(connector);
 572         struct drm_device *dev = connector->dev;
 573
 574         if (property == dev->mode_config.scaling_mode_property) {
 575                 struct drm_crtc *crtc = lvds_encoder->base.base.crtc;
 576
 577                 if (value == DRM_MODE_SCALE_NONE) {
 578                         DRM_DEBUG_KMS("no scaling not supported\n");
 579                         return -EINVAL;
 580                 }
 581
 582                 if (lvds_encoder->fitting_mode == value) {
 583                         /* the LVDS scaling property is not changed */
 584                         return 0;
 585                 }
 586                 lvds_encoder->fitting_mode = value;
 587                 if (crtc && crtc->enabled) {
 588                         /*
 589                          * If the CRTC is enabled, the display will be changed
 590                          * according to the new panel fitting mode.
 591                          */
 592                         intel_set_mode(crtc, &crtc->mode,
 593                                        crtc->x, crtc->y, crtc->fb);
 594                 }
 595         }
 596
 597         return 0;
 598 }
 599
 600 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 601         .mode_fixup = intel_lvds_mode_fixup,
 602         .mode_set = intel_lvds_mode_set,
 603         .disable = intel_encoder_noop,
 604 };
 605
 606 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 607         .get_modes = intel_lvds_get_modes,
 608         .mode_valid = intel_lvds_mode_valid,
 609         .best_encoder = intel_best_encoder,
 610 };
 611
 612 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 613         .dpms = intel_connector_dpms,
 614         .detect = intel_lvds_detect,
 615         .fill_modes = drm_helper_probe_single_connector_modes,
 616         .set_property = intel_lvds_set_property,
 617         .destroy = intel_lvds_destroy,
 618 };
 619
 620 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 621         .destroy = intel_encoder_destroy,
 622 };
 623
 624 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 625 {
 626         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 627         return 1;
 628 }
 629
 630 /* These systems claim to have LVDS, but really don't */
 631 static const struct dmi_system_id intel_no_lvds[] = {
 632         {
 633                 .callback = intel_no_lvds_dmi_callback,
 634                 .ident = "Apple Mac Mini (Core series)",
 635                 .matches = {
 636                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 637                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 638                 },
 639         },
 640         {
 641                 .callback = intel_no_lvds_dmi_callback,
 642                 .ident = "Apple Mac Mini (Core 2 series)",
 643                 .matches = {
 644                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 645                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 646                 },
 647         },
 648         {
 649                 .callback = intel_no_lvds_dmi_callback,
 650                 .ident = "MSI IM-945GSE-A",
 651                 .matches = {
 652                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 653                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 654                 },
 655         },
 656         {
 657                 .callback = intel_no_lvds_dmi_callback,
 658                 .ident = "Dell Studio Hybrid",
 659                 .matches = {
 660                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 661                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 662                 },
 663         },
 664         {
 665                 .callback = intel_no_lvds_dmi_callback,
 666                 .ident = "Dell OptiPlex FX170",
 667                 .matches = {
 668                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 669                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 670                 },
 671         },
 672         {
 673                 .callback = intel_no_lvds_dmi_callback,
 674                 .ident = "AOpen Mini PC",
 675                 .matches = {
 676                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 677                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 678                 },
 679         },
 680         {
 681                 .callback = intel_no_lvds_dmi_callback,
 682                 .ident = "AOpen Mini PC MP915",
 683                 .matches = {
 684                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 685                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 686                 },
 687         },
 688         {
 689                 .callback = intel_no_lvds_dmi_callback,
 690                 .ident = "AOpen i915GMm-HFS",
 691                 .matches = {
 692                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 693                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 694                 },
 695         },
 696         {
 697                 .callback = intel_no_lvds_dmi_callback,
 698                 .ident = "AOpen i45GMx-I",
 699                 .matches = {
 700                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 701                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 702                 },
 703         },
 704         {
 705                 .callback = intel_no_lvds_dmi_callback,
 706                 .ident = "Aopen i945GTt-VFA",
 707                 .matches = {
 708                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 709                 },
 710         },
 711         {
 712                 .callback = intel_no_lvds_dmi_callback,
 713                 .ident = "Clientron U800",
 714                 .matches = {
 715                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 716                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 717                 },
 718         },
 719         {
 720                 .callback = intel_no_lvds_dmi_callback,
 721                 .ident = "Clientron E830",
 722                 .matches = {
 723                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 724                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 725                 },
 726         },
 727         {
 728                 .callback = intel_no_lvds_dmi_callback,
 729                 .ident = "Asus EeeBox PC EB1007",
 730                 .matches = {
 731                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 732                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 733                 },
 734         },
 735         {
 736                 .callback = intel_no_lvds_dmi_callback,
 737                 .ident = "Asus AT5NM10T-I",
 738                 .matches = {
 739                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 740                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 741                 },
 742         },
 743         {
 744                 .callback = intel_no_lvds_dmi_callback,
 745                 .ident = "Hewlett-Packard HP t5740e Thin Client",
 746                 .matches = {
 747                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 748                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
 749                 },
 750         },
 751         {
 752                 .callback = intel_no_lvds_dmi_callback,
 753                 .ident = "Hewlett-Packard t5745",
 754                 .matches = {
 755                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 756                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 757                 },
 758         },
 759         {
 760                 .callback = intel_no_lvds_dmi_callback,
 761                 .ident = "Hewlett-Packard st5747",
 762                 .matches = {
 763                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 764                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 765                 },
 766         },
 767         {
 768                 .callback = intel_no_lvds_dmi_callback,
 769                 .ident = "MSI Wind Box DC500",
 770                 .matches = {
 771                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 772                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 773                 },
 774         },
 775         {
 776                 .callback = intel_no_lvds_dmi_callback,
 777                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
 778                 .matches = {
 779                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
 780                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
 781                 },
 782         },
 783         {
 784                 .callback = intel_no_lvds_dmi_callback,
 785                 .ident = "Gigabyte GA-D525TUD",
 786                 .matches = {
 787                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 788                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 789                 },
 790         },
 791
 792         { }     /* terminating entry */
 793 };
 794
 795 /**
 796  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 797  * @dev: drm device
 798  * @connector: LVDS connector
 799  *
 800  * Find the reduced downclock for LVDS in EDID.
 801  */
 802 static void intel_find_lvds_downclock(struct drm_device *dev,
 803                                       struct drm_display_mode *fixed_mode,
 804                                       struct drm_connector *connector)
 805 {
 806         struct drm_i915_private *dev_priv = dev->dev_private;
 807         struct drm_display_mode *scan;
 808         int temp_downclock;
 809
 810         temp_downclock = fixed_mode->clock;
 811         list_for_each_entry(scan, &connector->probed_modes, head) {
 812                 /*
 813                  * If one mode has the same resolution with the fixed_panel
 814                  * mode while they have the different refresh rate, it means
 815                  * that the reduced downclock is found for the LVDS. In such
 816                  * case we can set the different FPx0/1 to dynamically select
 817                  * between low and high frequency.
 818                  */
 819                 if (scan->hdisplay == fixed_mode->hdisplay &&
 820                     scan->hsync_start == fixed_mode->hsync_start &&
 821                     scan->hsync_end == fixed_mode->hsync_end &&
 822                     scan->htotal == fixed_mode->htotal &&
 823                     scan->vdisplay == fixed_mode->vdisplay &&
 824                     scan->vsync_start == fixed_mode->vsync_start &&
 825                     scan->vsync_end == fixed_mode->vsync_end &&
 826                     scan->vtotal == fixed_mode->vtotal) {
 827                         if (scan->clock < temp_downclock) {
 828                                 /*
 829                                  * The downclock is already found. But we
 830                                  * expect to find the lower downclock.
 831                                  */
 832                                 temp_downclock = scan->clock;
 833                         }
 834                 }
 835         }
 836         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 837                 /* We found the downclock for LVDS. */
 838                 dev_priv->lvds_downclock_avail = 1;
 839                 dev_priv->lvds_downclock = temp_downclock;
 840                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 841                               "Normal clock %dKhz, downclock %dKhz\n",
 842                               fixed_mode->clock, temp_downclock);
 843         }
 844 }
 845
 846 /*
 847  * Enumerate the child dev array parsed from VBT to check whether
 848  * the LVDS is present.
 849  * If it is present, return 1.
 850  * If it is not present, return false.
 851  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 852  */
 853 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 854                                    u8 *i2c_pin)
 855 {
 856         struct drm_i915_private *dev_priv = dev->dev_private;
 857         int i;
 858
 859         if (!dev_priv->child_dev_num)
 860                 return true;
 861
 862         for (i = 0; i < dev_priv->child_dev_num; i++) {
 863                 struct child_device_config *child = dev_priv->child_dev + i;
 864
 865                 /* If the device type is not LFP, continue.
 866                  * We have to check both the new identifiers as well as the
 867                  * old for compatibility with some BIOSes.
 868                  */
 869                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 870                     child->device_type != DEVICE_TYPE_LFP)
 871                         continue;
 872
 873                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 874                         *i2c_pin = child->i2c_pin;
 875
 876                 /* However, we cannot trust the BIOS writers to populate
 877                  * the VBT correctly.  Since LVDS requires additional
 878                  * information from AIM blocks, a non-zero addin offset is
 879                  * a good indicator that the LVDS is actually present.
 880                  */
 881                 if (child->addin_offset)
 882                         return true;
 883
 884                 /* But even then some BIOS writers perform some black magic
 885                  * and instantiate the device without reference to any
 886                  * additional data.  Trust that if the VBT was written into
 887                  * the OpRegion then they have validated the LVDS's existence.
 888                  */
 889                 if (dev_priv->opregion.vbt)
 890                         return true;
 891         }
 892
 893         return false;
 894 }
 895
 896 static bool intel_lvds_supported(struct drm_device *dev)
 897 {
 898         /* With the introduction of the PCH we gained a dedicated
 899          * LVDS presence pin, use it. */
 900         if (HAS_PCH_SPLIT(dev))
 901                 return true;
 902
 903         /* Otherwise LVDS was only attached to mobile products,
 904          * except for the inglorious 830gm */
 905         return IS_MOBILE(dev) && !IS_I830(dev);
 906 }
 907
 908 /**
 909  * intel_lvds_init - setup LVDS connectors on this device
 910  * @dev: drm device
 911  *
 912  * Create the connector, register the LVDS DDC bus, and try to figure out what
 913  * modes we can display on the LVDS panel (if present).
 914  */
 915 bool intel_lvds_init(struct drm_device *dev)
 916 {
 917         struct drm_i915_private *dev_priv = dev->dev_private;
 918         struct intel_lvds_encoder *lvds_encoder;
 919         struct intel_encoder *intel_encoder;
 920         struct intel_lvds_connector *lvds_connector;
 921         struct intel_connector *intel_connector;
 922         struct drm_connector *connector;
 923         struct drm_encoder *encoder;
 924         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 925         struct drm_crtc *crtc;
 926         u32 lvds;
 927         int pipe;
 928         u8 pin;
 929
 930         if (!intel_lvds_supported(dev))
 931                 return false;
 932
 933         /* Skip init on machines we know falsely report LVDS */
 934         if (dmi_check_system(intel_no_lvds))
 935                 return false;
 936
 937         pin = GMBUS_PORT_PANEL;
 938         if (!lvds_is_present_in_vbt(dev, &pin)) {
 939                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 940                 return false;
 941         }
 942
 943         if (HAS_PCH_SPLIT(dev)) {
 944                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 945                         return false;
 946                 if (dev_priv->edp.support) {
 947                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 948                         return false;
 949                 }
 950         }
 951
 952         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 953         if (!lvds_encoder)
 954                 return false;
 955
 956         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 957         if (!lvds_connector) {
 958                 kfree(lvds_encoder);
 959                 return false;
 960         }
 961
 962         if (!HAS_PCH_SPLIT(dev)) {
 963                 lvds_encoder->pfit_control = I915_READ(PFIT_CONTROL);
 964         }
 965
 966         intel_encoder = &lvds_encoder->base;
 967         encoder = &intel_encoder->base;
 968         intel_connector = &lvds_connector->base;
 969         connector = &intel_connector->base;
 970         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 971                            DRM_MODE_CONNECTOR_LVDS);
 972
 973         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 974                          DRM_MODE_ENCODER_LVDS);
 975
 976         intel_encoder->enable = intel_enable_lvds;
 977         intel_encoder->disable = intel_disable_lvds;
 978         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 979         intel_connector->get_hw_state = intel_connector_get_hw_state;
 980
 981         intel_connector_attach_encoder(intel_connector, intel_encoder);
 982         intel_encoder->type = INTEL_OUTPUT_LVDS;
 983
 984         intel_encoder->cloneable = false;
 985         if (HAS_PCH_SPLIT(dev))
 986                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 987         else if (IS_GEN4(dev))
 988                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 989         else
 990                 intel_encoder->crtc_mask = (1 << 1);
 991
 992         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 993         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 994         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 995         connector->interlace_allowed = false;
 996         connector->doublescan_allowed = false;
 997
 998         /* create the scaling mode property */
 999         drm_mode_create_scaling_mode_property(dev);
1000         /*
1001          * the initial panel fitting mode will be FULL_SCREEN.
1002          */
1003
1004         drm_connector_attach_property(&intel_connector->base,
1005                                       dev->mode_config.scaling_mode_property,
1006                                       DRM_MODE_SCALE_ASPECT);
1007         lvds_encoder->fitting_mode = DRM_MODE_SCALE_ASPECT;
1008         /*
1009          * LVDS discovery:
1010          * 1) check for EDID on DDC
1011          * 2) check for VBT data
1012          * 3) check to see if LVDS is already on
1013          *    if none of the above, no panel
1014          * 4) make sure lid is open
1015          *    if closed, act like it's not there for now
1016          */
1017
1018         /*
1019          * Attempt to get the fixed panel mode from DDC.  Assume that the
1020          * preferred mode is the right one.
1021          */
1022         lvds_encoder->edid = drm_get_edid(connector,
1023                                           intel_gmbus_get_adapter(dev_priv, pin));
1024         if (lvds_encoder->edid) {
1025                 if (drm_add_edid_modes(connector, lvds_encoder->edid)) {
1026                         drm_mode_connector_update_edid_property(connector,
1027                                                                 lvds_encoder->edid);
1028                 } else {
1029                         kfree(lvds_encoder->edid);
1030                         lvds_encoder->edid = NULL;
1031                 }
1032         }
1033         if (!lvds_encoder->edid) {
1034                 /* Didn't get an EDID, so
1035                  * Set wide sync ranges so we get all modes
1036                  * handed to valid_mode for checking
1037                  */
1038                 connector->display_info.min_vfreq = 0;
1039                 connector->display_info.max_vfreq = 200;
1040                 connector->display_info.min_hfreq = 0;
1041                 connector->display_info.max_hfreq = 200;
1042         }
1043
1044         list_for_each_entry(scan, &connector->probed_modes, head) {
1045                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1046                         lvds_encoder->fixed_mode = drm_mode_duplicate(dev, scan);
1047                         intel_find_lvds_downclock(dev, lvds_encoder->fixed_mode,
1048                                                   connector);
1049                         goto out;
1050                 }
1051         }
1052
1053         /* Failed to get EDID, what about VBT? */
1054         if (dev_priv->lfp_lvds_vbt_mode) {
1055                 lvds_encoder->fixed_mode =
1056                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1057                 if (lvds_encoder->fixed_mode) {
1058                         lvds_encoder->fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1059                         goto out;
1060                 }
1061         }
1062
1063         /*
1064          * If we didn't get EDID, try checking if the panel is already turned
1065          * on.  If so, assume that whatever is currently programmed is the
1066          * correct mode.
1067          */
1068
1069         /* Ironlake: FIXME if still fail, not try pipe mode now */
1070         if (HAS_PCH_SPLIT(dev))
1071                 goto failed;
1072
1073         lvds = I915_READ(LVDS);
1074         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1075         crtc = intel_get_crtc_for_pipe(dev, pipe);
1076
1077         if (crtc && (lvds & LVDS_PORT_EN)) {
1078                 lvds_encoder->fixed_mode = intel_crtc_mode_get(dev, crtc);
1079                 if (lvds_encoder->fixed_mode) {
1080                         lvds_encoder->fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1081                         goto out;
1082                 }
1083         }
1084
1085         /* If we still don't have a mode after all that, give up. */
1086         if (!lvds_encoder->fixed_mode)
1087                 goto failed;
1088
1089 out:
1090         /*
1091          * Unlock registers and just
1092          * leave them unlocked
1093          */
1094         if (HAS_PCH_SPLIT(dev)) {
1095                 I915_WRITE(PCH_PP_CONTROL,
1096                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1097         } else {
1098                 I915_WRITE(PP_CONTROL,
1099                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1100         }
1101         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1102         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1103                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1104                 lvds_connector->lid_notifier.notifier_call = NULL;
1105         }
1106         drm_sysfs_connector_add(connector);
1107
1108         intel_panel_setup_backlight(connector);
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(lvds_encoder);
1117         kfree(lvds_connector);
1118         return false;
1119 }