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         bool is_dual_link;
  53         u32 reg;
  54
  55         struct intel_lvds_connector *attached_connector;
  56 };
  57
  58 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  59 {
  60         return container_of(encoder, struct intel_lvds_encoder, base.base);
  61 }
  62
  63 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  64 {
  65         return container_of(connector, struct intel_lvds_connector, base.base);
  66 }
  67
  68 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  69                                     enum pipe *pipe)
  70 {
  71         struct drm_device *dev = encoder->base.dev;
  72         struct drm_i915_private *dev_priv = dev->dev_private;
  73         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  74         u32 tmp;
  75
  76         tmp = I915_READ(lvds_encoder->reg);
  77
  78         if (!(tmp & LVDS_PORT_EN))
  79                 return false;
  80
  81         if (HAS_PCH_CPT(dev))
  82                 *pipe = PORT_TO_PIPE_CPT(tmp);
  83         else
  84                 *pipe = PORT_TO_PIPE(tmp);
  85
  86         return true;
  87 }
  88
  89 static void intel_lvds_get_config(struct intel_encoder *encoder,
  90                                   struct intel_crtc_config *pipe_config)
  91 {
  92         struct drm_device *dev = encoder->base.dev;
  93         struct drm_i915_private *dev_priv = dev->dev_private;
  94         u32 lvds_reg, tmp, flags = 0;
  95
  96         if (HAS_PCH_SPLIT(dev))
  97                 lvds_reg = PCH_LVDS;
  98         else
  99                 lvds_reg = LVDS;
 100
 101         tmp = I915_READ(lvds_reg);
 102         if (tmp & LVDS_HSYNC_POLARITY)
 103                 flags |= DRM_MODE_FLAG_NHSYNC;
 104         else
 105                 flags |= DRM_MODE_FLAG_PHSYNC;
 106         if (tmp & LVDS_VSYNC_POLARITY)
 107                 flags |= DRM_MODE_FLAG_NVSYNC;
 108         else
 109                 flags |= DRM_MODE_FLAG_PVSYNC;
 110
 111         pipe_config->adjusted_mode.flags |= flags;
 112 }
 113
 114 /* The LVDS pin pair needs to be on before the DPLLs are enabled.
 115  * This is an exception to the general rule that mode_set doesn't turn
 116  * things on.
 117  */
 118 static void intel_pre_enable_lvds(struct intel_encoder *encoder)
 119 {
 120         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 121         struct drm_device *dev = encoder->base.dev;
 122         struct drm_i915_private *dev_priv = dev->dev_private;
 123         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 124         struct drm_display_mode *fixed_mode =
 125                 lvds_encoder->attached_connector->base.panel.fixed_mode;
 126         int pipe = crtc->pipe;
 127         u32 temp;
 128
 129         if (HAS_PCH_SPLIT(dev)) {
 130                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 131                 assert_shared_dpll_disabled(dev_priv,
 132                                             intel_crtc_to_shared_dpll(crtc));
 133         } else {
 134                 assert_pll_disabled(dev_priv, pipe);
 135         }
 136
 137         temp = I915_READ(lvds_encoder->reg);
 138         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 139
 140         if (HAS_PCH_CPT(dev)) {
 141                 temp &= ~PORT_TRANS_SEL_MASK;
 142                 temp |= PORT_TRANS_SEL_CPT(pipe);
 143         } else {
 144                 if (pipe == 1) {
 145                         temp |= LVDS_PIPEB_SELECT;
 146                 } else {
 147                         temp &= ~LVDS_PIPEB_SELECT;
 148                 }
 149         }
 150
 151         /* set the corresponsding LVDS_BORDER bit */
 152         temp &= ~LVDS_BORDER_ENABLE;
 153         temp |= crtc->config.gmch_pfit.lvds_border_bits;
 154         /* Set the B0-B3 data pairs corresponding to whether we're going to
 155          * set the DPLLs for dual-channel mode or not.
 156          */
 157         if (lvds_encoder->is_dual_link)
 158                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 159         else
 160                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 161
 162         /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 163          * appropriately here, but we need to look more thoroughly into how
 164          * panels behave in the two modes.
 165          */
 166
 167         /* Set the dithering flag on LVDS as needed, note that there is no
 168          * special lvds dither control bit on pch-split platforms, dithering is
 169          * only controlled through the PIPECONF reg. */
 170         if (INTEL_INFO(dev)->gen == 4) {
 171                 /* Bspec wording suggests that LVDS port dithering only exists
 172                  * for 18bpp panels. */
 173                 if (crtc->config.dither && crtc->config.pipe_bpp == 18)
 174                         temp |= LVDS_ENABLE_DITHER;
 175                 else
 176                         temp &= ~LVDS_ENABLE_DITHER;
 177         }
 178         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 179         if (fixed_mode->flags & DRM_MODE_FLAG_NHSYNC)
 180                 temp |= LVDS_HSYNC_POLARITY;
 181         if (fixed_mode->flags & DRM_MODE_FLAG_NVSYNC)
 182                 temp |= LVDS_VSYNC_POLARITY;
 183
 184         I915_WRITE(lvds_encoder->reg, temp);
 185 }
 186
 187 /**
 188  * Sets the power state for the panel.
 189  */
 190 static void intel_enable_lvds(struct intel_encoder *encoder)
 191 {
 192         struct drm_device *dev = encoder->base.dev;
 193         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 194         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 195         struct drm_i915_private *dev_priv = dev->dev_private;
 196         u32 ctl_reg, stat_reg;
 197
 198         if (HAS_PCH_SPLIT(dev)) {
 199                 ctl_reg = PCH_PP_CONTROL;
 200                 stat_reg = PCH_PP_STATUS;
 201         } else {
 202                 ctl_reg = PP_CONTROL;
 203                 stat_reg = PP_STATUS;
 204         }
 205
 206         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 207
 208         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 209         POSTING_READ(lvds_encoder->reg);
 210         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 211                 DRM_ERROR("timed out waiting for panel to power on\n");
 212
 213         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 214 }
 215
 216 static void intel_disable_lvds(struct intel_encoder *encoder)
 217 {
 218         struct drm_device *dev = encoder->base.dev;
 219         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 220         struct drm_i915_private *dev_priv = dev->dev_private;
 221         u32 ctl_reg, stat_reg;
 222
 223         if (HAS_PCH_SPLIT(dev)) {
 224                 ctl_reg = PCH_PP_CONTROL;
 225                 stat_reg = PCH_PP_STATUS;
 226         } else {
 227                 ctl_reg = PP_CONTROL;
 228                 stat_reg = PP_STATUS;
 229         }
 230
 231         intel_panel_disable_backlight(dev);
 232
 233         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 234         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 235                 DRM_ERROR("timed out waiting for panel to power off\n");
 236
 237         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 238         POSTING_READ(lvds_encoder->reg);
 239 }
 240
 241 static int intel_lvds_mode_valid(struct drm_connector *connector,
 242                                  struct drm_display_mode *mode)
 243 {
 244         struct intel_connector *intel_connector = to_intel_connector(connector);
 245         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 246
 247         if (mode->hdisplay > fixed_mode->hdisplay)
 248                 return MODE_PANEL;
 249         if (mode->vdisplay > fixed_mode->vdisplay)
 250                 return MODE_PANEL;
 251
 252         return MODE_OK;
 253 }
 254
 255 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 256                                       struct intel_crtc_config *pipe_config)
 257 {
 258         struct drm_device *dev = intel_encoder->base.dev;
 259         struct drm_i915_private *dev_priv = dev->dev_private;
 260         struct intel_lvds_encoder *lvds_encoder =
 261                 to_lvds_encoder(&intel_encoder->base);
 262         struct intel_connector *intel_connector =
 263                 &lvds_encoder->attached_connector->base;
 264         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 265         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 266         unsigned int lvds_bpp;
 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 ((I915_READ(lvds_encoder->reg) & LVDS_A3_POWER_MASK) ==
 275             LVDS_A3_POWER_UP)
 276                 lvds_bpp = 8*3;
 277         else
 278                 lvds_bpp = 6*3;
 279
 280         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 281                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 282                               pipe_config->pipe_bpp, lvds_bpp);
 283                 pipe_config->pipe_bpp = lvds_bpp;
 284         }
 285
 286         /*
 287          * We have timings from the BIOS for the panel, put them in
 288          * to the adjusted mode.  The CRTC will be set up for this mode,
 289          * with the panel scaling set up to source from the H/VDisplay
 290          * of the original mode.
 291          */
 292         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 293                                adjusted_mode);
 294
 295         if (HAS_PCH_SPLIT(dev)) {
 296                 pipe_config->has_pch_encoder = true;
 297
 298                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 299                                         intel_connector->panel.fitting_mode);
 300                 return true;
 301         } else {
 302                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 303                                          intel_connector->panel.fitting_mode);
 304         }
 305
 306         drm_mode_set_crtcinfo(adjusted_mode, 0);
 307         pipe_config->timings_set = true;
 308
 309         /*
 310          * XXX: It would be nice to support lower refresh rates on the
 311          * panels to reduce power consumption, and perhaps match the
 312          * user's requested refresh rate.
 313          */
 314
 315         return true;
 316 }
 317
 318 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 319                                 struct drm_display_mode *mode,
 320                                 struct drm_display_mode *adjusted_mode)
 321 {
 322         /*
 323          * The LVDS pin pair will already have been turned on in the
 324          * intel_crtc_mode_set since it has a large impact on the DPLL
 325          * settings.
 326          */
 327 }
 328
 329 /**
 330  * Detect the LVDS connection.
 331  *
 332  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 333  * connected and closed means disconnected.  We also send hotplug events as
 334  * needed, using lid status notification from the input layer.
 335  */
 336 static enum drm_connector_status
 337 intel_lvds_detect(struct drm_connector *connector, bool force)
 338 {
 339         struct drm_device *dev = connector->dev;
 340         enum drm_connector_status status;
 341
 342         status = intel_panel_detect(dev);
 343         if (status != connector_status_unknown)
 344                 return status;
 345
 346         return connector_status_connected;
 347 }
 348
 349 /**
 350  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 351  */
 352 static int intel_lvds_get_modes(struct drm_connector *connector)
 353 {
 354         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 355         struct drm_device *dev = connector->dev;
 356         struct drm_display_mode *mode;
 357
 358         /* use cached edid if we have one */
 359         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 360                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 361
 362         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 363         if (mode == NULL)
 364                 return 0;
 365
 366         drm_mode_probed_add(connector, mode);
 367         return 1;
 368 }
 369
 370 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 371 {
 372         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 373         return 1;
 374 }
 375
 376 /* The GPU hangs up on these systems if modeset is performed on LID open */
 377 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 378         {
 379                 .callback = intel_no_modeset_on_lid_dmi_callback,
 380                 .ident = "Toshiba Tecra A11",
 381                 .matches = {
 382                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 383                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 384                 },
 385         },
 386
 387         { }     /* terminating entry */
 388 };
 389
 390 /*
 391  * Lid events. Note the use of 'modeset':
 392  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 393  *    and set it to MODESET_DONE on open
 394  *  - we use it as a "only once" bit (ie we ignore
 395  *    duplicate events where it was already properly set)
 396  *  - the suspend/resume paths will set it to
 397  *    MODESET_SUSPENDED and ignore the lid open event,
 398  *    because they restore the mode ("lid open").
 399  */
 400 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 401                             void *unused)
 402 {
 403         struct intel_lvds_connector *lvds_connector =
 404                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 405         struct drm_connector *connector = &lvds_connector->base.base;
 406         struct drm_device *dev = connector->dev;
 407         struct drm_i915_private *dev_priv = dev->dev_private;
 408
 409         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 410                 return NOTIFY_OK;
 411
 412         mutex_lock(&dev_priv->modeset_restore_lock);
 413         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 414                 goto exit;
 415         /*
 416          * check and update the status of LVDS connector after receiving
 417          * the LID nofication event.
 418          */
 419         connector->status = connector->funcs->detect(connector, false);
 420
 421         /* Don't force modeset on machines where it causes a GPU lockup */
 422         if (dmi_check_system(intel_no_modeset_on_lid))
 423                 goto exit;
 424         if (!acpi_lid_open()) {
 425                 /* do modeset on next lid open event */
 426                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 427                 goto exit;
 428         }
 429
 430         if (dev_priv->modeset_restore == MODESET_DONE)
 431                 goto exit;
 432
 433         drm_modeset_lock_all(dev);
 434         intel_modeset_setup_hw_state(dev, true);
 435         drm_modeset_unlock_all(dev);
 436
 437         dev_priv->modeset_restore = MODESET_DONE;
 438
 439 exit:
 440         mutex_unlock(&dev_priv->modeset_restore_lock);
 441         return NOTIFY_OK;
 442 }
 443
 444 /**
 445  * intel_lvds_destroy - unregister and free LVDS structures
 446  * @connector: connector to free
 447  *
 448  * Unregister the DDC bus for this connector then free the driver private
 449  * structure.
 450  */
 451 static void intel_lvds_destroy(struct drm_connector *connector)
 452 {
 453         struct intel_lvds_connector *lvds_connector =
 454                 to_lvds_connector(connector);
 455
 456         if (lvds_connector->lid_notifier.notifier_call)
 457                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 458
 459         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 460                 kfree(lvds_connector->base.edid);
 461
 462         intel_panel_fini(&lvds_connector->base.panel);
 463
 464         drm_sysfs_connector_remove(connector);
 465         drm_connector_cleanup(connector);
 466         kfree(connector);
 467 }
 468
 469 static int intel_lvds_set_property(struct drm_connector *connector,
 470                                    struct drm_property *property,
 471                                    uint64_t value)
 472 {
 473         struct intel_connector *intel_connector = to_intel_connector(connector);
 474         struct drm_device *dev = connector->dev;
 475
 476         if (property == dev->mode_config.scaling_mode_property) {
 477                 struct drm_crtc *crtc;
 478
 479                 if (value == DRM_MODE_SCALE_NONE) {
 480                         DRM_DEBUG_KMS("no scaling not supported\n");
 481                         return -EINVAL;
 482                 }
 483
 484                 if (intel_connector->panel.fitting_mode == value) {
 485                         /* the LVDS scaling property is not changed */
 486                         return 0;
 487                 }
 488                 intel_connector->panel.fitting_mode = value;
 489
 490                 crtc = intel_attached_encoder(connector)->base.crtc;
 491                 if (crtc && crtc->enabled) {
 492                         /*
 493                          * If the CRTC is enabled, the display will be changed
 494                          * according to the new panel fitting mode.
 495                          */
 496                         intel_crtc_restore_mode(crtc);
 497                 }
 498         }
 499
 500         return 0;
 501 }
 502
 503 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 504         .mode_set = intel_lvds_mode_set,
 505 };
 506
 507 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 508         .get_modes = intel_lvds_get_modes,
 509         .mode_valid = intel_lvds_mode_valid,
 510         .best_encoder = intel_best_encoder,
 511 };
 512
 513 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 514         .dpms = intel_connector_dpms,
 515         .detect = intel_lvds_detect,
 516         .fill_modes = drm_helper_probe_single_connector_modes,
 517         .set_property = intel_lvds_set_property,
 518         .destroy = intel_lvds_destroy,
 519 };
 520
 521 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 522         .destroy = intel_encoder_destroy,
 523 };
 524
 525 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 526 {
 527         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 528         return 1;
 529 }
 530
 531 /* These systems claim to have LVDS, but really don't */
 532 static const struct dmi_system_id intel_no_lvds[] = {
 533         {
 534                 .callback = intel_no_lvds_dmi_callback,
 535                 .ident = "Apple Mac Mini (Core series)",
 536                 .matches = {
 537                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 538                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 539                 },
 540         },
 541         {
 542                 .callback = intel_no_lvds_dmi_callback,
 543                 .ident = "Apple Mac Mini (Core 2 series)",
 544                 .matches = {
 545                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 546                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 547                 },
 548         },
 549         {
 550                 .callback = intel_no_lvds_dmi_callback,
 551                 .ident = "MSI IM-945GSE-A",
 552                 .matches = {
 553                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 554                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 555                 },
 556         },
 557         {
 558                 .callback = intel_no_lvds_dmi_callback,
 559                 .ident = "Dell Studio Hybrid",
 560                 .matches = {
 561                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 562                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 563                 },
 564         },
 565         {
 566                 .callback = intel_no_lvds_dmi_callback,
 567                 .ident = "Dell OptiPlex FX170",
 568                 .matches = {
 569                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 570                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 571                 },
 572         },
 573         {
 574                 .callback = intel_no_lvds_dmi_callback,
 575                 .ident = "AOpen Mini PC",
 576                 .matches = {
 577                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 578                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 579                 },
 580         },
 581         {
 582                 .callback = intel_no_lvds_dmi_callback,
 583                 .ident = "AOpen Mini PC MP915",
 584                 .matches = {
 585                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 586                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 587                 },
 588         },
 589         {
 590                 .callback = intel_no_lvds_dmi_callback,
 591                 .ident = "AOpen i915GMm-HFS",
 592                 .matches = {
 593                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 594                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 595                 },
 596         },
 597         {
 598                 .callback = intel_no_lvds_dmi_callback,
 599                 .ident = "AOpen i45GMx-I",
 600                 .matches = {
 601                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 602                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 603                 },
 604         },
 605         {
 606                 .callback = intel_no_lvds_dmi_callback,
 607                 .ident = "Aopen i945GTt-VFA",
 608                 .matches = {
 609                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 610                 },
 611         },
 612         {
 613                 .callback = intel_no_lvds_dmi_callback,
 614                 .ident = "Clientron U800",
 615                 .matches = {
 616                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 617                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 618                 },
 619         },
 620         {
 621                 .callback = intel_no_lvds_dmi_callback,
 622                 .ident = "Clientron E830",
 623                 .matches = {
 624                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 625                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 626                 },
 627         },
 628         {
 629                 .callback = intel_no_lvds_dmi_callback,
 630                 .ident = "Asus EeeBox PC EB1007",
 631                 .matches = {
 632                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 633                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 634                 },
 635         },
 636         {
 637                 .callback = intel_no_lvds_dmi_callback,
 638                 .ident = "Asus AT5NM10T-I",
 639                 .matches = {
 640                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 641                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 642                 },
 643         },
 644         {
 645                 .callback = intel_no_lvds_dmi_callback,
 646                 .ident = "Hewlett-Packard HP t5740",
 647                 .matches = {
 648                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 649                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 650                 },
 651         },
 652         {
 653                 .callback = intel_no_lvds_dmi_callback,
 654                 .ident = "Hewlett-Packard t5745",
 655                 .matches = {
 656                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 657                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 658                 },
 659         },
 660         {
 661                 .callback = intel_no_lvds_dmi_callback,
 662                 .ident = "Hewlett-Packard st5747",
 663                 .matches = {
 664                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 665                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 666                 },
 667         },
 668         {
 669                 .callback = intel_no_lvds_dmi_callback,
 670                 .ident = "MSI Wind Box DC500",
 671                 .matches = {
 672                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 673                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 674                 },
 675         },
 676         {
 677                 .callback = intel_no_lvds_dmi_callback,
 678                 .ident = "Gigabyte GA-D525TUD",
 679                 .matches = {
 680                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 681                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 682                 },
 683         },
 684         {
 685                 .callback = intel_no_lvds_dmi_callback,
 686                 .ident = "Supermicro X7SPA-H",
 687                 .matches = {
 688                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 689                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 690                 },
 691         },
 692         {
 693                 .callback = intel_no_lvds_dmi_callback,
 694                 .ident = "Fujitsu Esprimo Q900",
 695                 .matches = {
 696                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 697                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 698                 },
 699         },
 700
 701         { }     /* terminating entry */
 702 };
 703
 704 /**
 705  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 706  * @dev: drm device
 707  * @connector: LVDS connector
 708  *
 709  * Find the reduced downclock for LVDS in EDID.
 710  */
 711 static void intel_find_lvds_downclock(struct drm_device *dev,
 712                                       struct drm_display_mode *fixed_mode,
 713                                       struct drm_connector *connector)
 714 {
 715         struct drm_i915_private *dev_priv = dev->dev_private;
 716         struct drm_display_mode *scan;
 717         int temp_downclock;
 718
 719         temp_downclock = fixed_mode->clock;
 720         list_for_each_entry(scan, &connector->probed_modes, head) {
 721                 /*
 722                  * If one mode has the same resolution with the fixed_panel
 723                  * mode while they have the different refresh rate, it means
 724                  * that the reduced downclock is found for the LVDS. In such
 725                  * case we can set the different FPx0/1 to dynamically select
 726                  * between low and high frequency.
 727                  */
 728                 if (scan->hdisplay == fixed_mode->hdisplay &&
 729                     scan->hsync_start == fixed_mode->hsync_start &&
 730                     scan->hsync_end == fixed_mode->hsync_end &&
 731                     scan->htotal == fixed_mode->htotal &&
 732                     scan->vdisplay == fixed_mode->vdisplay &&
 733                     scan->vsync_start == fixed_mode->vsync_start &&
 734                     scan->vsync_end == fixed_mode->vsync_end &&
 735                     scan->vtotal == fixed_mode->vtotal) {
 736                         if (scan->clock < temp_downclock) {
 737                                 /*
 738                                  * The downclock is already found. But we
 739                                  * expect to find the lower downclock.
 740                                  */
 741                                 temp_downclock = scan->clock;
 742                         }
 743                 }
 744         }
 745         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 746                 /* We found the downclock for LVDS. */
 747                 dev_priv->lvds_downclock_avail = 1;
 748                 dev_priv->lvds_downclock = temp_downclock;
 749                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 750                               "Normal clock %dKhz, downclock %dKhz\n",
 751                               fixed_mode->clock, temp_downclock);
 752         }
 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                 struct child_device_config *child = dev_priv->vbt.child_dev + i;
 773
 774                 /* If the device type is not LFP, continue.
 775                  * We have to check both the new identifiers as well as the
 776                  * old for compatibility with some BIOSes.
 777                  */
 778                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 779                     child->device_type != DEVICE_TYPE_LFP)
 780                         continue;
 781
 782                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 783                         *i2c_pin = child->i2c_pin;
 784
 785                 /* However, we cannot trust the BIOS writers to populate
 786                  * the VBT correctly.  Since LVDS requires additional
 787                  * information from AIM blocks, a non-zero addin offset is
 788                  * a good indicator that the LVDS is actually present.
 789                  */
 790                 if (child->addin_offset)
 791                         return true;
 792
 793                 /* But even then some BIOS writers perform some black magic
 794                  * and instantiate the device without reference to any
 795                  * additional data.  Trust that if the VBT was written into
 796                  * the OpRegion then they have validated the LVDS's existence.
 797                  */
 798                 if (dev_priv->opregion.vbt)
 799                         return true;
 800         }
 801
 802         return false;
 803 }
 804
 805 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 806 {
 807         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 808         return 1;
 809 }
 810
 811 static const struct dmi_system_id intel_dual_link_lvds[] = {
 812         {
 813                 .callback = intel_dual_link_lvds_callback,
 814                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 815                 .matches = {
 816                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 817                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 818                 },
 819         },
 820         { }     /* terminating entry */
 821 };
 822
 823 bool intel_is_dual_link_lvds(struct drm_device *dev)
 824 {
 825         struct intel_encoder *encoder;
 826         struct intel_lvds_encoder *lvds_encoder;
 827
 828         list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 829                             base.head) {
 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 edid *edid;
 899         struct drm_crtc *crtc;
 900         u32 lvds;
 901         int pipe;
 902         u8 pin;
 903
 904         if (!intel_lvds_supported(dev))
 905                 return;
 906
 907         /* Skip init on machines we know falsely report LVDS */
 908         if (dmi_check_system(intel_no_lvds))
 909                 return;
 910
 911         pin = GMBUS_PORT_PANEL;
 912         if (!lvds_is_present_in_vbt(dev, &pin)) {
 913                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 914                 return;
 915         }
 916
 917         if (HAS_PCH_SPLIT(dev)) {
 918                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 919                         return;
 920                 if (dev_priv->vbt.edp_support) {
 921                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 922                         return;
 923                 }
 924         }
 925
 926         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
 927         if (!lvds_encoder)
 928                 return;
 929
 930         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
 931         if (!lvds_connector) {
 932                 kfree(lvds_encoder);
 933                 return;
 934         }
 935
 936         lvds_encoder->attached_connector = lvds_connector;
 937
 938         intel_encoder = &lvds_encoder->base;
 939         encoder = &intel_encoder->base;
 940         intel_connector = &lvds_connector->base;
 941         connector = &intel_connector->base;
 942         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 943                            DRM_MODE_CONNECTOR_LVDS);
 944
 945         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 946                          DRM_MODE_ENCODER_LVDS);
 947
 948         intel_encoder->enable = intel_enable_lvds;
 949         intel_encoder->pre_enable = intel_pre_enable_lvds;
 950         intel_encoder->compute_config = intel_lvds_compute_config;
 951         intel_encoder->disable = intel_disable_lvds;
 952         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 953         intel_encoder->get_config = intel_lvds_get_config;
 954         intel_connector->get_hw_state = intel_connector_get_hw_state;
 955
 956         intel_connector_attach_encoder(intel_connector, intel_encoder);
 957         intel_encoder->type = INTEL_OUTPUT_LVDS;
 958
 959         intel_encoder->cloneable = false;
 960         if (HAS_PCH_SPLIT(dev))
 961                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 962         else if (IS_GEN4(dev))
 963                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 964         else
 965                 intel_encoder->crtc_mask = (1 << 1);
 966
 967         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 968         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 969         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 970         connector->interlace_allowed = false;
 971         connector->doublescan_allowed = false;
 972
 973         if (HAS_PCH_SPLIT(dev)) {
 974                 lvds_encoder->reg = PCH_LVDS;
 975         } else {
 976                 lvds_encoder->reg = LVDS;
 977         }
 978
 979         /* create the scaling mode property */
 980         drm_mode_create_scaling_mode_property(dev);
 981         drm_object_attach_property(&connector->base,
 982                                       dev->mode_config.scaling_mode_property,
 983                                       DRM_MODE_SCALE_ASPECT);
 984         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
 985         /*
 986          * LVDS discovery:
 987          * 1) check for EDID on DDC
 988          * 2) check for VBT data
 989          * 3) check to see if LVDS is already on
 990          *    if none of the above, no panel
 991          * 4) make sure lid is open
 992          *    if closed, act like it's not there for now
 993          */
 994
 995         /*
 996          * Attempt to get the fixed panel mode from DDC.  Assume that the
 997          * preferred mode is the right one.
 998          */
 999         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1000         if (edid) {
1001                 if (drm_add_edid_modes(connector, edid)) {
1002                         drm_mode_connector_update_edid_property(connector,
1003                                                                 edid);
1004                 } else {
1005                         kfree(edid);
1006                         edid = ERR_PTR(-EINVAL);
1007                 }
1008         } else {
1009                 edid = ERR_PTR(-ENOENT);
1010         }
1011         lvds_connector->base.edid = edid;
1012
1013         if (IS_ERR_OR_NULL(edid)) {
1014                 /* Didn't get an EDID, so
1015                  * Set wide sync ranges so we get all modes
1016                  * handed to valid_mode for checking
1017                  */
1018                 connector->display_info.min_vfreq = 0;
1019                 connector->display_info.max_vfreq = 200;
1020                 connector->display_info.min_hfreq = 0;
1021                 connector->display_info.max_hfreq = 200;
1022         }
1023
1024         list_for_each_entry(scan, &connector->probed_modes, head) {
1025                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1026                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1027                         drm_mode_debug_printmodeline(scan);
1028
1029                         fixed_mode = drm_mode_duplicate(dev, scan);
1030                         if (fixed_mode) {
1031                                 intel_find_lvds_downclock(dev, fixed_mode,
1032                                                           connector);
1033                                 goto out;
1034                         }
1035                 }
1036         }
1037
1038         /* Failed to get EDID, what about VBT? */
1039         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1040                 DRM_DEBUG_KMS("using mode from VBT: ");
1041                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1042
1043                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1044                 if (fixed_mode) {
1045                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1046                         goto out;
1047                 }
1048         }
1049
1050         /*
1051          * If we didn't get EDID, try checking if the panel is already turned
1052          * on.  If so, assume that whatever is currently programmed is the
1053          * correct mode.
1054          */
1055
1056         /* Ironlake: FIXME if still fail, not try pipe mode now */
1057         if (HAS_PCH_SPLIT(dev))
1058                 goto failed;
1059
1060         lvds = I915_READ(LVDS);
1061         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1062         crtc = intel_get_crtc_for_pipe(dev, pipe);
1063
1064         if (crtc && (lvds & LVDS_PORT_EN)) {
1065                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1066                 if (fixed_mode) {
1067                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1068                         drm_mode_debug_printmodeline(fixed_mode);
1069                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1070                         goto out;
1071                 }
1072         }
1073
1074         /* If we still don't have a mode after all that, give up. */
1075         if (!fixed_mode)
1076                 goto failed;
1077
1078 out:
1079         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1080         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1081                       lvds_encoder->is_dual_link ? "dual" : "single");
1082
1083         /*
1084          * Unlock registers and just
1085          * leave them unlocked
1086          */
1087         if (HAS_PCH_SPLIT(dev)) {
1088                 I915_WRITE(PCH_PP_CONTROL,
1089                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1090         } else {
1091                 I915_WRITE(PP_CONTROL,
1092                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1093         }
1094         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1095         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1096                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1097                 lvds_connector->lid_notifier.notifier_call = NULL;
1098         }
1099         drm_sysfs_connector_add(connector);
1100
1101         intel_panel_init(&intel_connector->panel, fixed_mode);
1102         intel_panel_setup_backlight(connector);
1103
1104         return;
1105
1106 failed:
1107         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1108         drm_connector_cleanup(connector);
1109         drm_encoder_cleanup(encoder);
1110         if (fixed_mode)
1111                 drm_mode_destroy(dev, fixed_mode);
1112         kfree(lvds_encoder);
1113         kfree(lvds_connector);
1114         return;
1115 }