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_atomic_helper.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_edid.h>
  38 #include "intel_drv.h"
  39 #include <drm/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_connector {
  45         struct intel_connector base;
  46
  47         struct notifier_block lid_notifier;
  48 };
  49
  50 struct intel_lvds_encoder {
  51         struct intel_encoder base;
  52
  53         bool is_dual_link;
  54         u32 reg;
  55         u32 a3_power;
  56
  57         struct intel_lvds_connector *attached_connector;
  58 };
  59
  60 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  61 {
  62         return container_of(encoder, struct intel_lvds_encoder, base.base);
  63 }
  64
  65 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  66 {
  67         return container_of(connector, struct intel_lvds_connector, base.base);
  68 }
  69
  70 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  71                                     enum pipe *pipe)
  72 {
  73         struct drm_device *dev = encoder->base.dev;
  74         struct drm_i915_private *dev_priv = dev->dev_private;
  75         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  76         enum intel_display_power_domain power_domain;
  77         u32 tmp;
  78
  79         power_domain = intel_display_port_power_domain(encoder);
  80         if (!intel_display_power_is_enabled(dev_priv, power_domain))
  81                 return false;
  82
  83         tmp = I915_READ(lvds_encoder->reg);
  84
  85         if (!(tmp & LVDS_PORT_EN))
  86                 return false;
  87
  88         if (HAS_PCH_CPT(dev))
  89                 *pipe = PORT_TO_PIPE_CPT(tmp);
  90         else
  91                 *pipe = PORT_TO_PIPE(tmp);
  92
  93         return true;
  94 }
  95
  96 static void intel_lvds_get_config(struct intel_encoder *encoder,
  97                                   struct intel_crtc_state *pipe_config)
  98 {
  99         struct drm_device *dev = encoder->base.dev;
 100         struct drm_i915_private *dev_priv = dev->dev_private;
 101         u32 lvds_reg, tmp, flags = 0;
 102         int dotclock;
 103
 104         if (HAS_PCH_SPLIT(dev))
 105                 lvds_reg = PCH_LVDS;
 106         else
 107                 lvds_reg = LVDS;
 108
 109         tmp = I915_READ(lvds_reg);
 110         if (tmp & LVDS_HSYNC_POLARITY)
 111                 flags |= DRM_MODE_FLAG_NHSYNC;
 112         else
 113                 flags |= DRM_MODE_FLAG_PHSYNC;
 114         if (tmp & LVDS_VSYNC_POLARITY)
 115                 flags |= DRM_MODE_FLAG_NVSYNC;
 116         else
 117                 flags |= DRM_MODE_FLAG_PVSYNC;
 118
 119         pipe_config->base.adjusted_mode.flags |= flags;
 120
 121         /* gen2/3 store dither state in pfit control, needs to match */
 122         if (INTEL_INFO(dev)->gen < 4) {
 123                 tmp = I915_READ(PFIT_CONTROL);
 124
 125                 pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
 126         }
 127
 128         dotclock = pipe_config->port_clock;
 129
 130         if (HAS_PCH_SPLIT(dev_priv->dev))
 131                 ironlake_check_encoder_dotclock(pipe_config, dotclock);
 132
 133         pipe_config->base.adjusted_mode.crtc_clock = dotclock;
 134 }
 135
 136 static void intel_pre_enable_lvds(struct intel_encoder *encoder)
 137 {
 138         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 139         struct drm_device *dev = encoder->base.dev;
 140         struct drm_i915_private *dev_priv = dev->dev_private;
 141         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 142         const struct drm_display_mode *adjusted_mode =
 143                 &crtc->config->base.adjusted_mode;
 144         int pipe = crtc->pipe;
 145         u32 temp;
 146
 147         if (HAS_PCH_SPLIT(dev)) {
 148                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 149                 assert_shared_dpll_disabled(dev_priv,
 150                                             intel_crtc_to_shared_dpll(crtc));
 151         } else {
 152                 assert_pll_disabled(dev_priv, pipe);
 153         }
 154
 155         temp = I915_READ(lvds_encoder->reg);
 156         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 157
 158         if (HAS_PCH_CPT(dev)) {
 159                 temp &= ~PORT_TRANS_SEL_MASK;
 160                 temp |= PORT_TRANS_SEL_CPT(pipe);
 161         } else {
 162                 if (pipe == 1) {
 163                         temp |= LVDS_PIPEB_SELECT;
 164                 } else {
 165                         temp &= ~LVDS_PIPEB_SELECT;
 166                 }
 167         }
 168
 169         /* set the corresponsding LVDS_BORDER bit */
 170         temp &= ~LVDS_BORDER_ENABLE;
 171         temp |= crtc->config->gmch_pfit.lvds_border_bits;
 172         /* Set the B0-B3 data pairs corresponding to whether we're going to
 173          * set the DPLLs for dual-channel mode or not.
 174          */
 175         if (lvds_encoder->is_dual_link)
 176                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 177         else
 178                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 179
 180         /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 181          * appropriately here, but we need to look more thoroughly into how
 182          * panels behave in the two modes. For now, let's just maintain the
 183          * value we got from the BIOS.
 184          */
 185          temp &= ~LVDS_A3_POWER_MASK;
 186          temp |= lvds_encoder->a3_power;
 187
 188         /* Set the dithering flag on LVDS as needed, note that there is no
 189          * special lvds dither control bit on pch-split platforms, dithering is
 190          * only controlled through the PIPECONF reg. */
 191         if (INTEL_INFO(dev)->gen == 4) {
 192                 /* Bspec wording suggests that LVDS port dithering only exists
 193                  * for 18bpp panels. */
 194                 if (crtc->config->dither && crtc->config->pipe_bpp == 18)
 195                         temp |= LVDS_ENABLE_DITHER;
 196                 else
 197                         temp &= ~LVDS_ENABLE_DITHER;
 198         }
 199         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 200         if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
 201                 temp |= LVDS_HSYNC_POLARITY;
 202         if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
 203                 temp |= LVDS_VSYNC_POLARITY;
 204
 205         I915_WRITE(lvds_encoder->reg, temp);
 206 }
 207
 208 /**
 209  * Sets the power state for the panel.
 210  */
 211 static void intel_enable_lvds(struct intel_encoder *encoder)
 212 {
 213         struct drm_device *dev = encoder->base.dev;
 214         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 215         struct intel_connector *intel_connector =
 216                 &lvds_encoder->attached_connector->base;
 217         struct drm_i915_private *dev_priv = dev->dev_private;
 218         u32 ctl_reg, stat_reg;
 219
 220         if (HAS_PCH_SPLIT(dev)) {
 221                 ctl_reg = PCH_PP_CONTROL;
 222                 stat_reg = PCH_PP_STATUS;
 223         } else {
 224                 ctl_reg = PP_CONTROL;
 225                 stat_reg = PP_STATUS;
 226         }
 227
 228         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 229
 230         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 231         POSTING_READ(lvds_encoder->reg);
 232         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 233                 DRM_ERROR("timed out waiting for panel to power on\n");
 234
 235         intel_panel_enable_backlight(intel_connector);
 236 }
 237
 238 static void intel_disable_lvds(struct intel_encoder *encoder)
 239 {
 240         struct drm_device *dev = encoder->base.dev;
 241         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 242         struct intel_connector *intel_connector =
 243                 &lvds_encoder->attached_connector->base;
 244         struct drm_i915_private *dev_priv = dev->dev_private;
 245         u32 ctl_reg, stat_reg;
 246
 247         if (HAS_PCH_SPLIT(dev)) {
 248                 ctl_reg = PCH_PP_CONTROL;
 249                 stat_reg = PCH_PP_STATUS;
 250         } else {
 251                 ctl_reg = PP_CONTROL;
 252                 stat_reg = PP_STATUS;
 253         }
 254
 255         intel_panel_disable_backlight(intel_connector);
 256
 257         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 258         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 259                 DRM_ERROR("timed out waiting for panel to power off\n");
 260
 261         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 262         POSTING_READ(lvds_encoder->reg);
 263 }
 264
 265 static enum drm_mode_status
 266 intel_lvds_mode_valid(struct drm_connector *connector,
 267                       struct drm_display_mode *mode)
 268 {
 269         struct intel_connector *intel_connector = to_intel_connector(connector);
 270         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 271
 272         if (mode->hdisplay > fixed_mode->hdisplay)
 273                 return MODE_PANEL;
 274         if (mode->vdisplay > fixed_mode->vdisplay)
 275                 return MODE_PANEL;
 276
 277         return MODE_OK;
 278 }
 279
 280 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 281                                       struct intel_crtc_state *pipe_config)
 282 {
 283         struct drm_device *dev = intel_encoder->base.dev;
 284         struct intel_lvds_encoder *lvds_encoder =
 285                 to_lvds_encoder(&intel_encoder->base);
 286         struct intel_connector *intel_connector =
 287                 &lvds_encoder->attached_connector->base;
 288         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 289         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 290         unsigned int lvds_bpp;
 291
 292         /* Should never happen!! */
 293         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 294                 DRM_ERROR("Can't support LVDS on pipe A\n");
 295                 return false;
 296         }
 297
 298         if (lvds_encoder->a3_power == LVDS_A3_POWER_UP)
 299                 lvds_bpp = 8*3;
 300         else
 301                 lvds_bpp = 6*3;
 302
 303         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 304                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 305                               pipe_config->pipe_bpp, lvds_bpp);
 306                 pipe_config->pipe_bpp = lvds_bpp;
 307         }
 308
 309         /*
 310          * We have timings from the BIOS for the panel, put them in
 311          * to the adjusted mode.  The CRTC will be set up for this mode,
 312          * with the panel scaling set up to source from the H/VDisplay
 313          * of the original mode.
 314          */
 315         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 316                                adjusted_mode);
 317
 318         if (HAS_PCH_SPLIT(dev)) {
 319                 pipe_config->has_pch_encoder = true;
 320
 321                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 322                                         intel_connector->panel.fitting_mode);
 323         } else {
 324                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 325                                          intel_connector->panel.fitting_mode);
 326
 327         }
 328
 329         /*
 330          * XXX: It would be nice to support lower refresh rates on the
 331          * panels to reduce power consumption, and perhaps match the
 332          * user's requested refresh rate.
 333          */
 334
 335         return true;
 336 }
 337
 338 /**
 339  * Detect the LVDS connection.
 340  *
 341  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 342  * connected and closed means disconnected.  We also send hotplug events as
 343  * needed, using lid status notification from the input layer.
 344  */
 345 static enum drm_connector_status
 346 intel_lvds_detect(struct drm_connector *connector, bool force)
 347 {
 348         struct drm_device *dev = connector->dev;
 349         enum drm_connector_status status;
 350
 351         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 352                       connector->base.id, connector->name);
 353
 354         status = intel_panel_detect(dev);
 355         if (status != connector_status_unknown)
 356                 return status;
 357
 358         return connector_status_connected;
 359 }
 360
 361 /**
 362  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 363  */
 364 static int intel_lvds_get_modes(struct drm_connector *connector)
 365 {
 366         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 367         struct drm_device *dev = connector->dev;
 368         struct drm_display_mode *mode;
 369
 370         /* use cached edid if we have one */
 371         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 372                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 373
 374         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 375         if (mode == NULL)
 376                 return 0;
 377
 378         drm_mode_probed_add(connector, mode);
 379         return 1;
 380 }
 381
 382 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 383 {
 384         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 385         return 1;
 386 }
 387
 388 /* The GPU hangs up on these systems if modeset is performed on LID open */
 389 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 390         {
 391                 .callback = intel_no_modeset_on_lid_dmi_callback,
 392                 .ident = "Toshiba Tecra A11",
 393                 .matches = {
 394                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 395                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 396                 },
 397         },
 398
 399         { }     /* terminating entry */
 400 };
 401
 402 /*
 403  * Lid events. Note the use of 'modeset':
 404  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 405  *    and set it to MODESET_DONE on open
 406  *  - we use it as a "only once" bit (ie we ignore
 407  *    duplicate events where it was already properly set)
 408  *  - the suspend/resume paths will set it to
 409  *    MODESET_SUSPENDED and ignore the lid open event,
 410  *    because they restore the mode ("lid open").
 411  */
 412 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 413                             void *unused)
 414 {
 415         struct intel_lvds_connector *lvds_connector =
 416                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 417         struct drm_connector *connector = &lvds_connector->base.base;
 418         struct drm_device *dev = connector->dev;
 419         struct drm_i915_private *dev_priv = dev->dev_private;
 420
 421         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 422                 return NOTIFY_OK;
 423
 424         mutex_lock(&dev_priv->modeset_restore_lock);
 425         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 426                 goto exit;
 427         /*
 428          * check and update the status of LVDS connector after receiving
 429          * the LID nofication event.
 430          */
 431         connector->status = connector->funcs->detect(connector, false);
 432
 433         /* Don't force modeset on machines where it causes a GPU lockup */
 434         if (dmi_check_system(intel_no_modeset_on_lid))
 435                 goto exit;
 436         if (!acpi_lid_open()) {
 437                 /* do modeset on next lid open event */
 438                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 439                 goto exit;
 440         }
 441
 442         if (dev_priv->modeset_restore == MODESET_DONE)
 443                 goto exit;
 444
 445         /*
 446          * Some old platform's BIOS love to wreak havoc while the lid is closed.
 447          * We try to detect this here and undo any damage. The split for PCH
 448          * platforms is rather conservative and a bit arbitrary expect that on
 449          * those platforms VGA disabling requires actual legacy VGA I/O access,
 450          * and as part of the cleanup in the hw state restore we also redisable
 451          * the vga plane.
 452          */
 453         if (!HAS_PCH_SPLIT(dev)) {
 454                 drm_modeset_lock_all(dev);
 455                 intel_modeset_setup_hw_state(dev, true);
 456                 drm_modeset_unlock_all(dev);
 457         }
 458
 459         dev_priv->modeset_restore = MODESET_DONE;
 460
 461 exit:
 462         mutex_unlock(&dev_priv->modeset_restore_lock);
 463         return NOTIFY_OK;
 464 }
 465
 466 /**
 467  * intel_lvds_destroy - unregister and free LVDS structures
 468  * @connector: connector to free
 469  *
 470  * Unregister the DDC bus for this connector then free the driver private
 471  * structure.
 472  */
 473 static void intel_lvds_destroy(struct drm_connector *connector)
 474 {
 475         struct intel_lvds_connector *lvds_connector =
 476                 to_lvds_connector(connector);
 477
 478         if (lvds_connector->lid_notifier.notifier_call)
 479                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 480
 481         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 482                 kfree(lvds_connector->base.edid);
 483
 484         intel_panel_fini(&lvds_connector->base.panel);
 485
 486         drm_connector_cleanup(connector);
 487         kfree(connector);
 488 }
 489
 490 static int intel_lvds_set_property(struct drm_connector *connector,
 491                                    struct drm_property *property,
 492                                    uint64_t value)
 493 {
 494         struct intel_connector *intel_connector = to_intel_connector(connector);
 495         struct drm_device *dev = connector->dev;
 496
 497         if (property == dev->mode_config.scaling_mode_property) {
 498                 struct drm_crtc *crtc;
 499
 500                 if (value == DRM_MODE_SCALE_NONE) {
 501                         DRM_DEBUG_KMS("no scaling not supported\n");
 502                         return -EINVAL;
 503                 }
 504
 505                 if (intel_connector->panel.fitting_mode == value) {
 506                         /* the LVDS scaling property is not changed */
 507                         return 0;
 508                 }
 509                 intel_connector->panel.fitting_mode = value;
 510
 511                 crtc = intel_attached_encoder(connector)->base.crtc;
 512                 if (crtc && crtc->enabled) {
 513                         /*
 514                          * If the CRTC is enabled, the display will be changed
 515                          * according to the new panel fitting mode.
 516                          */
 517                         intel_crtc_restore_mode(crtc);
 518                 }
 519         }
 520
 521         return 0;
 522 }
 523
 524 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 525         .get_modes = intel_lvds_get_modes,
 526         .mode_valid = intel_lvds_mode_valid,
 527         .best_encoder = intel_best_encoder,
 528 };
 529
 530 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 531         .dpms = intel_connector_dpms,
 532         .detect = intel_lvds_detect,
 533         .fill_modes = drm_helper_probe_single_connector_modes,
 534         .set_property = intel_lvds_set_property,
 535         .atomic_get_property = intel_connector_atomic_get_property,
 536         .destroy = intel_lvds_destroy,
 537         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 538 };
 539
 540 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 541         .destroy = intel_encoder_destroy,
 542 };
 543
 544 static int intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 545 {
 546         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 547         return 1;
 548 }
 549
 550 /* These systems claim to have LVDS, but really don't */
 551 static const struct dmi_system_id intel_no_lvds[] = {
 552         {
 553                 .callback = intel_no_lvds_dmi_callback,
 554                 .ident = "Apple Mac Mini (Core series)",
 555                 .matches = {
 556                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 557                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 558                 },
 559         },
 560         {
 561                 .callback = intel_no_lvds_dmi_callback,
 562                 .ident = "Apple Mac Mini (Core 2 series)",
 563                 .matches = {
 564                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 565                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 566                 },
 567         },
 568         {
 569                 .callback = intel_no_lvds_dmi_callback,
 570                 .ident = "MSI IM-945GSE-A",
 571                 .matches = {
 572                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 573                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 574                 },
 575         },
 576         {
 577                 .callback = intel_no_lvds_dmi_callback,
 578                 .ident = "Dell Studio Hybrid",
 579                 .matches = {
 580                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 581                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 582                 },
 583         },
 584         {
 585                 .callback = intel_no_lvds_dmi_callback,
 586                 .ident = "Dell OptiPlex FX170",
 587                 .matches = {
 588                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 589                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 590                 },
 591         },
 592         {
 593                 .callback = intel_no_lvds_dmi_callback,
 594                 .ident = "AOpen Mini PC",
 595                 .matches = {
 596                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 597                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 598                 },
 599         },
 600         {
 601                 .callback = intel_no_lvds_dmi_callback,
 602                 .ident = "AOpen Mini PC MP915",
 603                 .matches = {
 604                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 605                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 606                 },
 607         },
 608         {
 609                 .callback = intel_no_lvds_dmi_callback,
 610                 .ident = "AOpen i915GMm-HFS",
 611                 .matches = {
 612                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 613                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 614                 },
 615         },
 616         {
 617                 .callback = intel_no_lvds_dmi_callback,
 618                 .ident = "AOpen i45GMx-I",
 619                 .matches = {
 620                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 621                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 622                 },
 623         },
 624         {
 625                 .callback = intel_no_lvds_dmi_callback,
 626                 .ident = "Aopen i945GTt-VFA",
 627                 .matches = {
 628                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 629                 },
 630         },
 631         {
 632                 .callback = intel_no_lvds_dmi_callback,
 633                 .ident = "Clientron U800",
 634                 .matches = {
 635                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 636                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 637                 },
 638         },
 639         {
 640                 .callback = intel_no_lvds_dmi_callback,
 641                 .ident = "Clientron E830",
 642                 .matches = {
 643                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 644                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 645                 },
 646         },
 647         {
 648                 .callback = intel_no_lvds_dmi_callback,
 649                 .ident = "Asus EeeBox PC EB1007",
 650                 .matches = {
 651                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 652                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 653                 },
 654         },
 655         {
 656                 .callback = intel_no_lvds_dmi_callback,
 657                 .ident = "Asus AT5NM10T-I",
 658                 .matches = {
 659                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 660                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 661                 },
 662         },
 663         {
 664                 .callback = intel_no_lvds_dmi_callback,
 665                 .ident = "Hewlett-Packard HP t5740",
 666                 .matches = {
 667                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 668                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 669                 },
 670         },
 671         {
 672                 .callback = intel_no_lvds_dmi_callback,
 673                 .ident = "Hewlett-Packard t5745",
 674                 .matches = {
 675                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 676                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 677                 },
 678         },
 679         {
 680                 .callback = intel_no_lvds_dmi_callback,
 681                 .ident = "Hewlett-Packard st5747",
 682                 .matches = {
 683                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 684                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 685                 },
 686         },
 687         {
 688                 .callback = intel_no_lvds_dmi_callback,
 689                 .ident = "MSI Wind Box DC500",
 690                 .matches = {
 691                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 692                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 693                 },
 694         },
 695         {
 696                 .callback = intel_no_lvds_dmi_callback,
 697                 .ident = "Gigabyte GA-D525TUD",
 698                 .matches = {
 699                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 700                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 701                 },
 702         },
 703         {
 704                 .callback = intel_no_lvds_dmi_callback,
 705                 .ident = "Supermicro X7SPA-H",
 706                 .matches = {
 707                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 708                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 709                 },
 710         },
 711         {
 712                 .callback = intel_no_lvds_dmi_callback,
 713                 .ident = "Fujitsu Esprimo Q900",
 714                 .matches = {
 715                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 716                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 717                 },
 718         },
 719         {
 720                 .callback = intel_no_lvds_dmi_callback,
 721                 .ident = "Intel D410PT",
 722                 .matches = {
 723                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 724                         DMI_MATCH(DMI_BOARD_NAME, "D410PT"),
 725                 },
 726         },
 727         {
 728                 .callback = intel_no_lvds_dmi_callback,
 729                 .ident = "Intel D425KT",
 730                 .matches = {
 731                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 732                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D425KT"),
 733                 },
 734         },
 735         {
 736                 .callback = intel_no_lvds_dmi_callback,
 737                 .ident = "Intel D510MO",
 738                 .matches = {
 739                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 740                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 741                 },
 742         },
 743         {
 744                 .callback = intel_no_lvds_dmi_callback,
 745                 .ident = "Intel D525MW",
 746                 .matches = {
 747                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 748                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 749                 },
 750         },
 751
 752         { }     /* terminating entry */
 753 };
 754
 755 /*
 756  * Enumerate the child dev array parsed from VBT to check whether
 757  * the LVDS is present.
 758  * If it is present, return 1.
 759  * If it is not present, return false.
 760  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 761  */
 762 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 763                                    u8 *i2c_pin)
 764 {
 765         struct drm_i915_private *dev_priv = dev->dev_private;
 766         int i;
 767
 768         if (!dev_priv->vbt.child_dev_num)
 769                 return true;
 770
 771         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 772                 union child_device_config *uchild = dev_priv->vbt.child_dev + i;
 773                 struct old_child_dev_config *child = &uchild->old;
 774
 775                 /* If the device type is not LFP, continue.
 776                  * We have to check both the new identifiers as well as the
 777                  * old for compatibility with some BIOSes.
 778                  */
 779                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 780                     child->device_type != DEVICE_TYPE_LFP)
 781                         continue;
 782
 783                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 784                         *i2c_pin = child->i2c_pin;
 785
 786                 /* However, we cannot trust the BIOS writers to populate
 787                  * the VBT correctly.  Since LVDS requires additional
 788                  * information from AIM blocks, a non-zero addin offset is
 789                  * a good indicator that the LVDS is actually present.
 790                  */
 791                 if (child->addin_offset)
 792                         return true;
 793
 794                 /* But even then some BIOS writers perform some black magic
 795                  * and instantiate the device without reference to any
 796                  * additional data.  Trust that if the VBT was written into
 797                  * the OpRegion then they have validated the LVDS's existence.
 798                  */
 799                 if (dev_priv->opregion.vbt)
 800                         return true;
 801         }
 802
 803         return false;
 804 }
 805
 806 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 807 {
 808         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 809         return 1;
 810 }
 811
 812 static const struct dmi_system_id intel_dual_link_lvds[] = {
 813         {
 814                 .callback = intel_dual_link_lvds_callback,
 815                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 816                 .matches = {
 817                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 818                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 819                 },
 820         },
 821         { }     /* terminating entry */
 822 };
 823
 824 bool intel_is_dual_link_lvds(struct drm_device *dev)
 825 {
 826         struct intel_encoder *encoder;
 827         struct intel_lvds_encoder *lvds_encoder;
 828
 829         for_each_intel_encoder(dev, encoder) {
 830                 if (encoder->type == INTEL_OUTPUT_LVDS) {
 831                         lvds_encoder = to_lvds_encoder(&encoder->base);
 832
 833                         return lvds_encoder->is_dual_link;
 834                 }
 835         }
 836
 837         return false;
 838 }
 839
 840 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 841 {
 842         struct drm_device *dev = lvds_encoder->base.base.dev;
 843         unsigned int val;
 844         struct drm_i915_private *dev_priv = dev->dev_private;
 845
 846         /* use the module option value if specified */
 847         if (i915.lvds_channel_mode > 0)
 848                 return i915.lvds_channel_mode == 2;
 849
 850         if (dmi_check_system(intel_dual_link_lvds))
 851                 return true;
 852
 853         /* BIOS should set the proper LVDS register value at boot, but
 854          * in reality, it doesn't set the value when the lid is closed;
 855          * we need to check "the value to be set" in VBT when LVDS
 856          * register is uninitialized.
 857          */
 858         val = I915_READ(lvds_encoder->reg);
 859         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 860                 val = dev_priv->vbt.bios_lvds_val;
 861
 862         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 863 }
 864
 865 static bool intel_lvds_supported(struct drm_device *dev)
 866 {
 867         /* With the introduction of the PCH we gained a dedicated
 868          * LVDS presence pin, use it. */
 869         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 870                 return true;
 871
 872         /* Otherwise LVDS was only attached to mobile products,
 873          * except for the inglorious 830gm */
 874         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 875                 return true;
 876
 877         return false;
 878 }
 879
 880 /**
 881  * intel_lvds_init - setup LVDS connectors on this device
 882  * @dev: drm device
 883  *
 884  * Create the connector, register the LVDS DDC bus, and try to figure out what
 885  * modes we can display on the LVDS panel (if present).
 886  */
 887 void intel_lvds_init(struct drm_device *dev)
 888 {
 889         struct drm_i915_private *dev_priv = dev->dev_private;
 890         struct intel_lvds_encoder *lvds_encoder;
 891         struct intel_encoder *intel_encoder;
 892         struct intel_lvds_connector *lvds_connector;
 893         struct intel_connector *intel_connector;
 894         struct drm_connector *connector;
 895         struct drm_encoder *encoder;
 896         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 897         struct drm_display_mode *fixed_mode = NULL;
 898         struct drm_display_mode *downclock_mode = NULL;
 899         struct edid *edid;
 900         struct drm_crtc *crtc;
 901         u32 lvds;
 902         int pipe;
 903         u8 pin;
 904
 905         /*
 906          * Unlock registers and just leave them unlocked. Do this before
 907          * checking quirk lists to avoid bogus WARNINGs.
 908          */
 909         if (HAS_PCH_SPLIT(dev)) {
 910                 I915_WRITE(PCH_PP_CONTROL,
 911                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
 912         } else {
 913                 I915_WRITE(PP_CONTROL,
 914                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
 915         }
 916         if (!intel_lvds_supported(dev))
 917                 return;
 918
 919         /* Skip init on machines we know falsely report LVDS */
 920         if (dmi_check_system(intel_no_lvds))
 921                 return;
 922
 923         pin = GMBUS_PORT_PANEL;
 924         if (!lvds_is_present_in_vbt(dev, &pin)) {
 925                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 926                 return;
 927         }
 928
 929         if (HAS_PCH_SPLIT(dev)) {
 930                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 931                         return;
 932                 if (dev_priv->vbt.edp_support) {
 933                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 934                         return;
 935                 }
 936         }
 937
 938         lvds_encoder = kzalloc(sizeof(*lvds_encoder), GFP_KERNEL);
 939         if (!lvds_encoder)
 940                 return;
 941
 942         lvds_connector = kzalloc(sizeof(*lvds_connector), GFP_KERNEL);
 943         if (!lvds_connector) {
 944                 kfree(lvds_encoder);
 945                 return;
 946         }
 947
 948         lvds_encoder->attached_connector = lvds_connector;
 949
 950         intel_encoder = &lvds_encoder->base;
 951         encoder = &intel_encoder->base;
 952         intel_connector = &lvds_connector->base;
 953         connector = &intel_connector->base;
 954         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 955                            DRM_MODE_CONNECTOR_LVDS);
 956
 957         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 958                          DRM_MODE_ENCODER_LVDS);
 959
 960         intel_encoder->enable = intel_enable_lvds;
 961         intel_encoder->pre_enable = intel_pre_enable_lvds;
 962         intel_encoder->compute_config = intel_lvds_compute_config;
 963         intel_encoder->disable = intel_disable_lvds;
 964         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 965         intel_encoder->get_config = intel_lvds_get_config;
 966         intel_connector->get_hw_state = intel_connector_get_hw_state;
 967         intel_connector->unregister = intel_connector_unregister;
 968
 969         intel_connector_attach_encoder(intel_connector, intel_encoder);
 970         intel_encoder->type = INTEL_OUTPUT_LVDS;
 971
 972         intel_encoder->cloneable = 0;
 973         if (HAS_PCH_SPLIT(dev))
 974                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 975         else if (IS_GEN4(dev))
 976                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 977         else
 978                 intel_encoder->crtc_mask = (1 << 1);
 979
 980         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 981         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 982         connector->interlace_allowed = false;
 983         connector->doublescan_allowed = false;
 984
 985         if (HAS_PCH_SPLIT(dev)) {
 986                 lvds_encoder->reg = PCH_LVDS;
 987         } else {
 988                 lvds_encoder->reg = LVDS;
 989         }
 990
 991         /* create the scaling mode property */
 992         drm_mode_create_scaling_mode_property(dev);
 993         drm_object_attach_property(&connector->base,
 994                                       dev->mode_config.scaling_mode_property,
 995                                       DRM_MODE_SCALE_ASPECT);
 996         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
 997         /*
 998          * LVDS discovery:
 999          * 1) check for EDID on DDC
1000          * 2) check for VBT data
1001          * 3) check to see if LVDS is already on
1002          *    if none of the above, no panel
1003          * 4) make sure lid is open
1004          *    if closed, act like it's not there for now
1005          */
1006
1007         /*
1008          * Attempt to get the fixed panel mode from DDC.  Assume that the
1009          * preferred mode is the right one.
1010          */
1011         mutex_lock(&dev->mode_config.mutex);
1012         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1013         if (edid) {
1014                 if (drm_add_edid_modes(connector, edid)) {
1015                         drm_mode_connector_update_edid_property(connector,
1016                                                                 edid);
1017                 } else {
1018                         kfree(edid);
1019                         edid = ERR_PTR(-EINVAL);
1020                 }
1021         } else {
1022                 edid = ERR_PTR(-ENOENT);
1023         }
1024         lvds_connector->base.edid = edid;
1025
1026         if (IS_ERR_OR_NULL(edid)) {
1027                 /* Didn't get an EDID, so
1028                  * Set wide sync ranges so we get all modes
1029                  * handed to valid_mode for checking
1030                  */
1031                 connector->display_info.min_vfreq = 0;
1032                 connector->display_info.max_vfreq = 200;
1033                 connector->display_info.min_hfreq = 0;
1034                 connector->display_info.max_hfreq = 200;
1035         }
1036
1037         list_for_each_entry(scan, &connector->probed_modes, head) {
1038                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1039                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1040                         drm_mode_debug_printmodeline(scan);
1041
1042                         fixed_mode = drm_mode_duplicate(dev, scan);
1043                         if (fixed_mode) {
1044                                 downclock_mode =
1045                                         intel_find_panel_downclock(dev,
1046                                         fixed_mode, connector);
1047                                 if (downclock_mode != NULL &&
1048                                         i915.lvds_downclock) {
1049                                         /* We found the downclock for LVDS. */
1050                                         dev_priv->lvds_downclock_avail = true;
1051                                         dev_priv->lvds_downclock =
1052                                                 downclock_mode->clock;
1053                                         DRM_DEBUG_KMS("LVDS downclock is found"
1054                                         " in EDID. Normal clock %dKhz, "
1055                                         "downclock %dKhz\n",
1056                                         fixed_mode->clock,
1057                                         dev_priv->lvds_downclock);
1058                                 }
1059                                 goto out;
1060                         }
1061                 }
1062         }
1063
1064         /* Failed to get EDID, what about VBT? */
1065         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1066                 DRM_DEBUG_KMS("using mode from VBT: ");
1067                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1068
1069                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1070                 if (fixed_mode) {
1071                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1072                         goto out;
1073                 }
1074         }
1075
1076         /*
1077          * If we didn't get EDID, try checking if the panel is already turned
1078          * on.  If so, assume that whatever is currently programmed is the
1079          * correct mode.
1080          */
1081
1082         /* Ironlake: FIXME if still fail, not try pipe mode now */
1083         if (HAS_PCH_SPLIT(dev))
1084                 goto failed;
1085
1086         lvds = I915_READ(LVDS);
1087         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1088         crtc = intel_get_crtc_for_pipe(dev, pipe);
1089
1090         if (crtc && (lvds & LVDS_PORT_EN)) {
1091                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1092                 if (fixed_mode) {
1093                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1094                         drm_mode_debug_printmodeline(fixed_mode);
1095                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1096                         goto out;
1097                 }
1098         }
1099
1100         /* If we still don't have a mode after all that, give up. */
1101         if (!fixed_mode)
1102                 goto failed;
1103
1104 out:
1105         mutex_unlock(&dev->mode_config.mutex);
1106
1107         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1108         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1109                       lvds_encoder->is_dual_link ? "dual" : "single");
1110
1111         lvds_encoder->a3_power = I915_READ(lvds_encoder->reg) &
1112                                  LVDS_A3_POWER_MASK;
1113
1114         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1115         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1116                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1117                 lvds_connector->lid_notifier.notifier_call = NULL;
1118         }
1119         drm_connector_register(connector);
1120
1121         intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
1122         intel_panel_setup_backlight(connector, INVALID_PIPE);
1123
1124         return;
1125
1126 failed:
1127         mutex_unlock(&dev->mode_config.mutex);
1128
1129         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1130         drm_connector_cleanup(connector);
1131         drm_encoder_cleanup(encoder);
1132         kfree(lvds_encoder);
1133         kfree(lvds_connector);
1134         return;
1135 }