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