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         /* gen2/3 store dither state in pfit control, needs to match */
 115         if (INTEL_INFO(dev)->gen < 4) {
 116                 tmp = I915_READ(PFIT_CONTROL);
 117
 118                 pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
 119         }
 120
 121         dotclock = pipe_config->port_clock;
 122
 123         if (HAS_PCH_SPLIT(dev_priv->dev))
 124                 ironlake_check_encoder_dotclock(pipe_config, dotclock);
 125
 126         pipe_config->adjusted_mode.crtc_clock = dotclock;
 127 }
 128
 129 /* The LVDS pin pair needs to be on before the DPLLs are enabled.
 130  * This is an exception to the general rule that mode_set doesn't turn
 131  * things on.
 132  */
 133 static void intel_pre_enable_lvds(struct intel_encoder *encoder)
 134 {
 135         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 136         struct drm_device *dev = encoder->base.dev;
 137         struct drm_i915_private *dev_priv = dev->dev_private;
 138         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 139         const struct drm_display_mode *adjusted_mode =
 140                 &crtc->config.adjusted_mode;
 141         int pipe = crtc->pipe;
 142         u32 temp;
 143
 144         if (HAS_PCH_SPLIT(dev)) {
 145                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 146                 assert_shared_dpll_disabled(dev_priv,
 147                                             intel_crtc_to_shared_dpll(crtc));
 148         } else {
 149                 assert_pll_disabled(dev_priv, pipe);
 150         }
 151
 152         temp = I915_READ(lvds_encoder->reg);
 153         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 154
 155         if (HAS_PCH_CPT(dev)) {
 156                 temp &= ~PORT_TRANS_SEL_MASK;
 157                 temp |= PORT_TRANS_SEL_CPT(pipe);
 158         } else {
 159                 if (pipe == 1) {
 160                         temp |= LVDS_PIPEB_SELECT;
 161                 } else {
 162                         temp &= ~LVDS_PIPEB_SELECT;
 163                 }
 164         }
 165
 166         /* set the corresponsding LVDS_BORDER bit */
 167         temp &= ~LVDS_BORDER_ENABLE;
 168         temp |= crtc->config.gmch_pfit.lvds_border_bits;
 169         /* Set the B0-B3 data pairs corresponding to whether we're going to
 170          * set the DPLLs for dual-channel mode or not.
 171          */
 172         if (lvds_encoder->is_dual_link)
 173                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 174         else
 175                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 176
 177         /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 178          * appropriately here, but we need to look more thoroughly into how
 179          * panels behave in the two modes.
 180          */
 181
 182         /* Set the dithering flag on LVDS as needed, note that there is no
 183          * special lvds dither control bit on pch-split platforms, dithering is
 184          * only controlled through the PIPECONF reg. */
 185         if (INTEL_INFO(dev)->gen == 4) {
 186                 /* Bspec wording suggests that LVDS port dithering only exists
 187                  * for 18bpp panels. */
 188                 if (crtc->config.dither && crtc->config.pipe_bpp == 18)
 189                         temp |= LVDS_ENABLE_DITHER;
 190                 else
 191                         temp &= ~LVDS_ENABLE_DITHER;
 192         }
 193         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 194         if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
 195                 temp |= LVDS_HSYNC_POLARITY;
 196         if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
 197                 temp |= LVDS_VSYNC_POLARITY;
 198
 199         I915_WRITE(lvds_encoder->reg, temp);
 200 }
 201
 202 /**
 203  * Sets the power state for the panel.
 204  */
 205 static void intel_enable_lvds(struct intel_encoder *encoder)
 206 {
 207         struct drm_device *dev = encoder->base.dev;
 208         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 209         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 210         struct drm_i915_private *dev_priv = dev->dev_private;
 211         u32 ctl_reg, stat_reg;
 212
 213         if (HAS_PCH_SPLIT(dev)) {
 214                 ctl_reg = PCH_PP_CONTROL;
 215                 stat_reg = PCH_PP_STATUS;
 216         } else {
 217                 ctl_reg = PP_CONTROL;
 218                 stat_reg = PP_STATUS;
 219         }
 220
 221         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 222
 223         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 224         POSTING_READ(lvds_encoder->reg);
 225         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 226                 DRM_ERROR("timed out waiting for panel to power on\n");
 227
 228         intel_panel_enable_backlight(dev, intel_crtc->pipe);
 229 }
 230
 231 static void intel_disable_lvds(struct intel_encoder *encoder)
 232 {
 233         struct drm_device *dev = encoder->base.dev;
 234         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 235         struct drm_i915_private *dev_priv = dev->dev_private;
 236         u32 ctl_reg, stat_reg;
 237
 238         if (HAS_PCH_SPLIT(dev)) {
 239                 ctl_reg = PCH_PP_CONTROL;
 240                 stat_reg = PCH_PP_STATUS;
 241         } else {
 242                 ctl_reg = PP_CONTROL;
 243                 stat_reg = PP_STATUS;
 244         }
 245
 246         intel_panel_disable_backlight(dev);
 247
 248         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 249         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 250                 DRM_ERROR("timed out waiting for panel to power off\n");
 251
 252         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 253         POSTING_READ(lvds_encoder->reg);
 254 }
 255
 256 static int intel_lvds_mode_valid(struct drm_connector *connector,
 257                                  struct drm_display_mode *mode)
 258 {
 259         struct intel_connector *intel_connector = to_intel_connector(connector);
 260         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 261
 262         if (mode->hdisplay > fixed_mode->hdisplay)
 263                 return MODE_PANEL;
 264         if (mode->vdisplay > fixed_mode->vdisplay)
 265                 return MODE_PANEL;
 266
 267         return MODE_OK;
 268 }
 269
 270 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 271                                       struct intel_crtc_config *pipe_config)
 272 {
 273         struct drm_device *dev = intel_encoder->base.dev;
 274         struct drm_i915_private *dev_priv = dev->dev_private;
 275         struct intel_lvds_encoder *lvds_encoder =
 276                 to_lvds_encoder(&intel_encoder->base);
 277         struct intel_connector *intel_connector =
 278                 &lvds_encoder->attached_connector->base;
 279         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 280         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 281         unsigned int lvds_bpp;
 282
 283         /* Should never happen!! */
 284         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 285                 DRM_ERROR("Can't support LVDS on pipe A\n");
 286                 return false;
 287         }
 288
 289         if ((I915_READ(lvds_encoder->reg) & LVDS_A3_POWER_MASK) ==
 290             LVDS_A3_POWER_UP)
 291                 lvds_bpp = 8*3;
 292         else
 293                 lvds_bpp = 6*3;
 294
 295         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 296                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 297                               pipe_config->pipe_bpp, lvds_bpp);
 298                 pipe_config->pipe_bpp = lvds_bpp;
 299         }
 300
 301         /*
 302          * We have timings from the BIOS for the panel, put them in
 303          * to the adjusted mode.  The CRTC will be set up for this mode,
 304          * with the panel scaling set up to source from the H/VDisplay
 305          * of the original mode.
 306          */
 307         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 308                                adjusted_mode);
 309
 310         if (HAS_PCH_SPLIT(dev)) {
 311                 pipe_config->has_pch_encoder = true;
 312
 313                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 314                                         intel_connector->panel.fitting_mode);
 315         } else {
 316                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 317                                          intel_connector->panel.fitting_mode);
 318
 319         }
 320
 321         /*
 322          * XXX: It would be nice to support lower refresh rates on the
 323          * panels to reduce power consumption, and perhaps match the
 324          * user's requested refresh rate.
 325          */
 326
 327         return true;
 328 }
 329
 330 static void intel_lvds_mode_set(struct intel_encoder *encoder)
 331 {
 332         /*
 333          * We don't do anything here, the LVDS port is fully set up in the pre
 334          * enable hook - the ordering constraints for enabling the lvds port vs.
 335          * enabling the display pll are too strict.
 336          */
 337 }
 338
 339 /**
 340  * Detect the LVDS connection.
 341  *
 342  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 343  * connected and closed means disconnected.  We also send hotplug events as
 344  * needed, using lid status notification from the input layer.
 345  */
 346 static enum drm_connector_status
 347 intel_lvds_detect(struct drm_connector *connector, bool force)
 348 {
 349         struct drm_device *dev = connector->dev;
 350         enum drm_connector_status status;
 351
 352         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 353                       connector->base.id, drm_get_connector_name(connector));
 354
 355         status = intel_panel_detect(dev);
 356         if (status != connector_status_unknown)
 357                 return status;
 358
 359         return connector_status_connected;
 360 }
 361
 362 /**
 363  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 364  */
 365 static int intel_lvds_get_modes(struct drm_connector *connector)
 366 {
 367         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 368         struct drm_device *dev = connector->dev;
 369         struct drm_display_mode *mode;
 370
 371         /* use cached edid if we have one */
 372         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 373                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 374
 375         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 376         if (mode == NULL)
 377                 return 0;
 378
 379         drm_mode_probed_add(connector, mode);
 380         return 1;
 381 }
 382
 383 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 384 {
 385         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 386         return 1;
 387 }
 388
 389 /* The GPU hangs up on these systems if modeset is performed on LID open */
 390 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 391         {
 392                 .callback = intel_no_modeset_on_lid_dmi_callback,
 393                 .ident = "Toshiba Tecra A11",
 394                 .matches = {
 395                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 396                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 397                 },
 398         },
 399
 400         { }     /* terminating entry */
 401 };
 402
 403 /*
 404  * Lid events. Note the use of 'modeset':
 405  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 406  *    and set it to MODESET_DONE on open
 407  *  - we use it as a "only once" bit (ie we ignore
 408  *    duplicate events where it was already properly set)
 409  *  - the suspend/resume paths will set it to
 410  *    MODESET_SUSPENDED and ignore the lid open event,
 411  *    because they restore the mode ("lid open").
 412  */
 413 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 414                             void *unused)
 415 {
 416         struct intel_lvds_connector *lvds_connector =
 417                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 418         struct drm_connector *connector = &lvds_connector->base.base;
 419         struct drm_device *dev = connector->dev;
 420         struct drm_i915_private *dev_priv = dev->dev_private;
 421
 422         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 423                 return NOTIFY_OK;
 424
 425         mutex_lock(&dev_priv->modeset_restore_lock);
 426         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 427                 goto exit;
 428         /*
 429          * check and update the status of LVDS connector after receiving
 430          * the LID nofication event.
 431          */
 432         connector->status = connector->funcs->detect(connector, false);
 433
 434         /* Don't force modeset on machines where it causes a GPU lockup */
 435         if (dmi_check_system(intel_no_modeset_on_lid))
 436                 goto exit;
 437         if (!acpi_lid_open()) {
 438                 /* do modeset on next lid open event */
 439                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 440                 goto exit;
 441         }
 442
 443         if (dev_priv->modeset_restore == MODESET_DONE)
 444                 goto exit;
 445
 446         drm_modeset_lock_all(dev);
 447         intel_modeset_setup_hw_state(dev, true);
 448         drm_modeset_unlock_all(dev);
 449
 450         dev_priv->modeset_restore = MODESET_DONE;
 451
 452 exit:
 453         mutex_unlock(&dev_priv->modeset_restore_lock);
 454         return NOTIFY_OK;
 455 }
 456
 457 /**
 458  * intel_lvds_destroy - unregister and free LVDS structures
 459  * @connector: connector to free
 460  *
 461  * Unregister the DDC bus for this connector then free the driver private
 462  * structure.
 463  */
 464 static void intel_lvds_destroy(struct drm_connector *connector)
 465 {
 466         struct intel_lvds_connector *lvds_connector =
 467                 to_lvds_connector(connector);
 468
 469         if (lvds_connector->lid_notifier.notifier_call)
 470                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 471
 472         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 473                 kfree(lvds_connector->base.edid);
 474
 475         intel_panel_fini(&lvds_connector->base.panel);
 476
 477         drm_connector_cleanup(connector);
 478         kfree(connector);
 479 }
 480
 481 static int intel_lvds_set_property(struct drm_connector *connector,
 482                                    struct drm_property *property,
 483                                    uint64_t value)
 484 {
 485         struct intel_connector *intel_connector = to_intel_connector(connector);
 486         struct drm_device *dev = connector->dev;
 487
 488         if (property == dev->mode_config.scaling_mode_property) {
 489                 struct drm_crtc *crtc;
 490
 491                 if (value == DRM_MODE_SCALE_NONE) {
 492                         DRM_DEBUG_KMS("no scaling not supported\n");
 493                         return -EINVAL;
 494                 }
 495
 496                 if (intel_connector->panel.fitting_mode == value) {
 497                         /* the LVDS scaling property is not changed */
 498                         return 0;
 499                 }
 500                 intel_connector->panel.fitting_mode = value;
 501
 502                 crtc = intel_attached_encoder(connector)->base.crtc;
 503                 if (crtc && crtc->enabled) {
 504                         /*
 505                          * If the CRTC is enabled, the display will be changed
 506                          * according to the new panel fitting mode.
 507                          */
 508                         intel_crtc_restore_mode(crtc);
 509                 }
 510         }
 511
 512         return 0;
 513 }
 514
 515 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 516         .get_modes = intel_lvds_get_modes,
 517         .mode_valid = intel_lvds_mode_valid,
 518         .best_encoder = intel_best_encoder,
 519 };
 520
 521 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 522         .dpms = intel_connector_dpms,
 523         .detect = intel_lvds_detect,
 524         .fill_modes = drm_helper_probe_single_connector_modes,
 525         .set_property = intel_lvds_set_property,
 526         .destroy = intel_lvds_destroy,
 527 };
 528
 529 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 530         .destroy = intel_encoder_destroy,
 531 };
 532
 533 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 534 {
 535         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 536         return 1;
 537 }
 538
 539 /* These systems claim to have LVDS, but really don't */
 540 static const struct dmi_system_id intel_no_lvds[] = {
 541         {
 542                 .callback = intel_no_lvds_dmi_callback,
 543                 .ident = "Apple Mac Mini (Core series)",
 544                 .matches = {
 545                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 546                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 547                 },
 548         },
 549         {
 550                 .callback = intel_no_lvds_dmi_callback,
 551                 .ident = "Apple Mac Mini (Core 2 series)",
 552                 .matches = {
 553                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 554                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 555                 },
 556         },
 557         {
 558                 .callback = intel_no_lvds_dmi_callback,
 559                 .ident = "MSI IM-945GSE-A",
 560                 .matches = {
 561                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 562                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 563                 },
 564         },
 565         {
 566                 .callback = intel_no_lvds_dmi_callback,
 567                 .ident = "Dell Studio Hybrid",
 568                 .matches = {
 569                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 570                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 571                 },
 572         },
 573         {
 574                 .callback = intel_no_lvds_dmi_callback,
 575                 .ident = "Dell OptiPlex FX170",
 576                 .matches = {
 577                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 578                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 579                 },
 580         },
 581         {
 582                 .callback = intel_no_lvds_dmi_callback,
 583                 .ident = "AOpen Mini PC",
 584                 .matches = {
 585                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 586                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 587                 },
 588         },
 589         {
 590                 .callback = intel_no_lvds_dmi_callback,
 591                 .ident = "AOpen Mini PC MP915",
 592                 .matches = {
 593                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 594                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 595                 },
 596         },
 597         {
 598                 .callback = intel_no_lvds_dmi_callback,
 599                 .ident = "AOpen i915GMm-HFS",
 600                 .matches = {
 601                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 602                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 603                 },
 604         },
 605         {
 606                 .callback = intel_no_lvds_dmi_callback,
 607                 .ident = "AOpen i45GMx-I",
 608                 .matches = {
 609                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 610                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 611                 },
 612         },
 613         {
 614                 .callback = intel_no_lvds_dmi_callback,
 615                 .ident = "Aopen i945GTt-VFA",
 616                 .matches = {
 617                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 618                 },
 619         },
 620         {
 621                 .callback = intel_no_lvds_dmi_callback,
 622                 .ident = "Clientron U800",
 623                 .matches = {
 624                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 625                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 626                 },
 627         },
 628         {
 629                 .callback = intel_no_lvds_dmi_callback,
 630                 .ident = "Clientron E830",
 631                 .matches = {
 632                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 633                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 634                 },
 635         },
 636         {
 637                 .callback = intel_no_lvds_dmi_callback,
 638                 .ident = "Asus EeeBox PC EB1007",
 639                 .matches = {
 640                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 641                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 642                 },
 643         },
 644         {
 645                 .callback = intel_no_lvds_dmi_callback,
 646                 .ident = "Asus AT5NM10T-I",
 647                 .matches = {
 648                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 649                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 650                 },
 651         },
 652         {
 653                 .callback = intel_no_lvds_dmi_callback,
 654                 .ident = "Hewlett-Packard HP t5740",
 655                 .matches = {
 656                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 657                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 658                 },
 659         },
 660         {
 661                 .callback = intel_no_lvds_dmi_callback,
 662                 .ident = "Hewlett-Packard t5745",
 663                 .matches = {
 664                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 665                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 666                 },
 667         },
 668         {
 669                 .callback = intel_no_lvds_dmi_callback,
 670                 .ident = "Hewlett-Packard st5747",
 671                 .matches = {
 672                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 673                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 674                 },
 675         },
 676         {
 677                 .callback = intel_no_lvds_dmi_callback,
 678                 .ident = "MSI Wind Box DC500",
 679                 .matches = {
 680                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 681                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 682                 },
 683         },
 684         {
 685                 .callback = intel_no_lvds_dmi_callback,
 686                 .ident = "Gigabyte GA-D525TUD",
 687                 .matches = {
 688                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 689                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 690                 },
 691         },
 692         {
 693                 .callback = intel_no_lvds_dmi_callback,
 694                 .ident = "Supermicro X7SPA-H",
 695                 .matches = {
 696                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 697                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 698                 },
 699         },
 700         {
 701                 .callback = intel_no_lvds_dmi_callback,
 702                 .ident = "Fujitsu Esprimo Q900",
 703                 .matches = {
 704                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 705                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 706                 },
 707         },
 708         {
 709                 .callback = intel_no_lvds_dmi_callback,
 710                 .ident = "Intel D510MO",
 711                 .matches = {
 712                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 713                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 714                 },
 715         },
 716         {
 717                 .callback = intel_no_lvds_dmi_callback,
 718                 .ident = "Intel D525MW",
 719                 .matches = {
 720                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 721                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 722                 },
 723         },
 724
 725         { }     /* terminating entry */
 726 };
 727
 728 /**
 729  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 730  * @dev: drm device
 731  * @connector: LVDS connector
 732  *
 733  * Find the reduced downclock for LVDS in EDID.
 734  */
 735 static void intel_find_lvds_downclock(struct drm_device *dev,
 736                                       struct drm_display_mode *fixed_mode,
 737                                       struct drm_connector *connector)
 738 {
 739         struct drm_i915_private *dev_priv = dev->dev_private;
 740         struct drm_display_mode *scan;
 741         int temp_downclock;
 742
 743         temp_downclock = fixed_mode->clock;
 744         list_for_each_entry(scan, &connector->probed_modes, head) {
 745                 /*
 746                  * If one mode has the same resolution with the fixed_panel
 747                  * mode while they have the different refresh rate, it means
 748                  * that the reduced downclock is found for the LVDS. In such
 749                  * case we can set the different FPx0/1 to dynamically select
 750                  * between low and high frequency.
 751                  */
 752                 if (scan->hdisplay == fixed_mode->hdisplay &&
 753                     scan->hsync_start == fixed_mode->hsync_start &&
 754                     scan->hsync_end == fixed_mode->hsync_end &&
 755                     scan->htotal == fixed_mode->htotal &&
 756                     scan->vdisplay == fixed_mode->vdisplay &&
 757                     scan->vsync_start == fixed_mode->vsync_start &&
 758                     scan->vsync_end == fixed_mode->vsync_end &&
 759                     scan->vtotal == fixed_mode->vtotal) {
 760                         if (scan->clock < temp_downclock) {
 761                                 /*
 762                                  * The downclock is already found. But we
 763                                  * expect to find the lower downclock.
 764                                  */
 765                                 temp_downclock = scan->clock;
 766                         }
 767                 }
 768         }
 769         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 770                 /* We found the downclock for LVDS. */
 771                 dev_priv->lvds_downclock_avail = 1;
 772                 dev_priv->lvds_downclock = temp_downclock;
 773                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 774                               "Normal clock %dKhz, downclock %dKhz\n",
 775                               fixed_mode->clock, temp_downclock);
 776         }
 777 }
 778
 779 /*
 780  * Enumerate the child dev array parsed from VBT to check whether
 781  * the LVDS is present.
 782  * If it is present, return 1.
 783  * If it is not present, return false.
 784  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 785  */
 786 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 787                                    u8 *i2c_pin)
 788 {
 789         struct drm_i915_private *dev_priv = dev->dev_private;
 790         int i;
 791
 792         if (!dev_priv->vbt.child_dev_num)
 793                 return true;
 794
 795         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 796                 union child_device_config *uchild = dev_priv->vbt.child_dev + i;
 797                 struct old_child_dev_config *child = &uchild->old;
 798
 799                 /* If the device type is not LFP, continue.
 800                  * We have to check both the new identifiers as well as the
 801                  * old for compatibility with some BIOSes.
 802                  */
 803                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 804                     child->device_type != DEVICE_TYPE_LFP)
 805                         continue;
 806
 807                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 808                         *i2c_pin = child->i2c_pin;
 809
 810                 /* However, we cannot trust the BIOS writers to populate
 811                  * the VBT correctly.  Since LVDS requires additional
 812                  * information from AIM blocks, a non-zero addin offset is
 813                  * a good indicator that the LVDS is actually present.
 814                  */
 815                 if (child->addin_offset)
 816                         return true;
 817
 818                 /* But even then some BIOS writers perform some black magic
 819                  * and instantiate the device without reference to any
 820                  * additional data.  Trust that if the VBT was written into
 821                  * the OpRegion then they have validated the LVDS's existence.
 822                  */
 823                 if (dev_priv->opregion.vbt)
 824                         return true;
 825         }
 826
 827         return false;
 828 }
 829
 830 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 831 {
 832         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 833         return 1;
 834 }
 835
 836 static const struct dmi_system_id intel_dual_link_lvds[] = {
 837         {
 838                 .callback = intel_dual_link_lvds_callback,
 839                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 840                 .matches = {
 841                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 842                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 843                 },
 844         },
 845         { }     /* terminating entry */
 846 };
 847
 848 bool intel_is_dual_link_lvds(struct drm_device *dev)
 849 {
 850         struct intel_encoder *encoder;
 851         struct intel_lvds_encoder *lvds_encoder;
 852
 853         list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 854                             base.head) {
 855                 if (encoder->type == INTEL_OUTPUT_LVDS) {
 856                         lvds_encoder = to_lvds_encoder(&encoder->base);
 857
 858                         return lvds_encoder->is_dual_link;
 859                 }
 860         }
 861
 862         return false;
 863 }
 864
 865 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 866 {
 867         struct drm_device *dev = lvds_encoder->base.base.dev;
 868         unsigned int val;
 869         struct drm_i915_private *dev_priv = dev->dev_private;
 870
 871         /* use the module option value if specified */
 872         if (i915_lvds_channel_mode > 0)
 873                 return i915_lvds_channel_mode == 2;
 874
 875         if (dmi_check_system(intel_dual_link_lvds))
 876                 return true;
 877
 878         /* BIOS should set the proper LVDS register value at boot, but
 879          * in reality, it doesn't set the value when the lid is closed;
 880          * we need to check "the value to be set" in VBT when LVDS
 881          * register is uninitialized.
 882          */
 883         val = I915_READ(lvds_encoder->reg);
 884         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 885                 val = dev_priv->vbt.bios_lvds_val;
 886
 887         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 888 }
 889
 890 static bool intel_lvds_supported(struct drm_device *dev)
 891 {
 892         /* With the introduction of the PCH we gained a dedicated
 893          * LVDS presence pin, use it. */
 894         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 895                 return true;
 896
 897         /* Otherwise LVDS was only attached to mobile products,
 898          * except for the inglorious 830gm */
 899         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 900                 return true;
 901
 902         return false;
 903 }
 904
 905 /**
 906  * intel_lvds_init - setup LVDS connectors on this device
 907  * @dev: drm device
 908  *
 909  * Create the connector, register the LVDS DDC bus, and try to figure out what
 910  * modes we can display on the LVDS panel (if present).
 911  */
 912 void intel_lvds_init(struct drm_device *dev)
 913 {
 914         struct drm_i915_private *dev_priv = dev->dev_private;
 915         struct intel_lvds_encoder *lvds_encoder;
 916         struct intel_encoder *intel_encoder;
 917         struct intel_lvds_connector *lvds_connector;
 918         struct intel_connector *intel_connector;
 919         struct drm_connector *connector;
 920         struct drm_encoder *encoder;
 921         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 922         struct drm_display_mode *fixed_mode = NULL;
 923         struct edid *edid;
 924         struct drm_crtc *crtc;
 925         u32 lvds;
 926         int pipe;
 927         u8 pin;
 928
 929         if (!intel_lvds_supported(dev))
 930                 return;
 931
 932         /* Skip init on machines we know falsely report LVDS */
 933         if (dmi_check_system(intel_no_lvds))
 934                 return;
 935
 936         pin = GMBUS_PORT_PANEL;
 937         if (!lvds_is_present_in_vbt(dev, &pin)) {
 938                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 939                 return;
 940         }
 941
 942         if (HAS_PCH_SPLIT(dev)) {
 943                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 944                         return;
 945                 if (dev_priv->vbt.edp_support) {
 946                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 947                         return;
 948                 }
 949         }
 950
 951         lvds_encoder = kzalloc(sizeof(*lvds_encoder), GFP_KERNEL);
 952         if (!lvds_encoder)
 953                 return;
 954
 955         lvds_connector = kzalloc(sizeof(*lvds_connector), GFP_KERNEL);
 956         if (!lvds_connector) {
 957                 kfree(lvds_encoder);
 958                 return;
 959         }
 960
 961         lvds_encoder->attached_connector = lvds_connector;
 962
 963         intel_encoder = &lvds_encoder->base;
 964         encoder = &intel_encoder->base;
 965         intel_connector = &lvds_connector->base;
 966         connector = &intel_connector->base;
 967         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 968                            DRM_MODE_CONNECTOR_LVDS);
 969
 970         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 971                          DRM_MODE_ENCODER_LVDS);
 972
 973         intel_encoder->enable = intel_enable_lvds;
 974         intel_encoder->pre_enable = intel_pre_enable_lvds;
 975         intel_encoder->compute_config = intel_lvds_compute_config;
 976         intel_encoder->mode_set = intel_lvds_mode_set;
 977         intel_encoder->disable = intel_disable_lvds;
 978         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 979         intel_encoder->get_config = intel_lvds_get_config;
 980         intel_connector->get_hw_state = intel_connector_get_hw_state;
 981
 982         intel_connector_attach_encoder(intel_connector, intel_encoder);
 983         intel_encoder->type = INTEL_OUTPUT_LVDS;
 984
 985         intel_encoder->cloneable = false;
 986         if (HAS_PCH_SPLIT(dev))
 987                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 988         else if (IS_GEN4(dev))
 989                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 990         else
 991                 intel_encoder->crtc_mask = (1 << 1);
 992
 993         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 994         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 995         connector->interlace_allowed = false;
 996         connector->doublescan_allowed = false;
 997
 998         if (HAS_PCH_SPLIT(dev)) {
 999                 lvds_encoder->reg = PCH_LVDS;
1000         } else {
1001                 lvds_encoder->reg = LVDS;
1002         }
1003
1004         /* create the scaling mode property */
1005         drm_mode_create_scaling_mode_property(dev);
1006         drm_object_attach_property(&connector->base,
1007                                       dev->mode_config.scaling_mode_property,
1008                                       DRM_MODE_SCALE_ASPECT);
1009         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1010         /*
1011          * LVDS discovery:
1012          * 1) check for EDID on DDC
1013          * 2) check for VBT data
1014          * 3) check to see if LVDS is already on
1015          *    if none of the above, no panel
1016          * 4) make sure lid is open
1017          *    if closed, act like it's not there for now
1018          */
1019
1020         /*
1021          * Attempt to get the fixed panel mode from DDC.  Assume that the
1022          * preferred mode is the right one.
1023          */
1024         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1025         if (edid) {
1026                 if (drm_add_edid_modes(connector, edid)) {
1027                         drm_mode_connector_update_edid_property(connector,
1028                                                                 edid);
1029                 } else {
1030                         kfree(edid);
1031                         edid = ERR_PTR(-EINVAL);
1032                 }
1033         } else {
1034                 edid = ERR_PTR(-ENOENT);
1035         }
1036         lvds_connector->base.edid = edid;
1037
1038         if (IS_ERR_OR_NULL(edid)) {
1039                 /* Didn't get an EDID, so
1040                  * Set wide sync ranges so we get all modes
1041                  * handed to valid_mode for checking
1042                  */
1043                 connector->display_info.min_vfreq = 0;
1044                 connector->display_info.max_vfreq = 200;
1045                 connector->display_info.min_hfreq = 0;
1046                 connector->display_info.max_hfreq = 200;
1047         }
1048
1049         list_for_each_entry(scan, &connector->probed_modes, head) {
1050                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1051                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1052                         drm_mode_debug_printmodeline(scan);
1053
1054                         fixed_mode = drm_mode_duplicate(dev, scan);
1055                         if (fixed_mode) {
1056                                 intel_find_lvds_downclock(dev, fixed_mode,
1057                                                           connector);
1058                                 goto out;
1059                         }
1060                 }
1061         }
1062
1063         /* Failed to get EDID, what about VBT? */
1064         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1065                 DRM_DEBUG_KMS("using mode from VBT: ");
1066                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1067
1068                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1069                 if (fixed_mode) {
1070                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1071                         goto out;
1072                 }
1073         }
1074
1075         /*
1076          * If we didn't get EDID, try checking if the panel is already turned
1077          * on.  If so, assume that whatever is currently programmed is the
1078          * correct mode.
1079          */
1080
1081         /* Ironlake: FIXME if still fail, not try pipe mode now */
1082         if (HAS_PCH_SPLIT(dev))
1083                 goto failed;
1084
1085         lvds = I915_READ(LVDS);
1086         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1087         crtc = intel_get_crtc_for_pipe(dev, pipe);
1088
1089         if (crtc && (lvds & LVDS_PORT_EN)) {
1090                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1091                 if (fixed_mode) {
1092                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1093                         drm_mode_debug_printmodeline(fixed_mode);
1094                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1095                         goto out;
1096                 }
1097         }
1098
1099         /* If we still don't have a mode after all that, give up. */
1100         if (!fixed_mode)
1101                 goto failed;
1102
1103 out:
1104         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1105         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1106                       lvds_encoder->is_dual_link ? "dual" : "single");
1107
1108         /*
1109          * Unlock registers and just
1110          * leave them unlocked
1111          */
1112         if (HAS_PCH_SPLIT(dev)) {
1113                 I915_WRITE(PCH_PP_CONTROL,
1114                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1115         } else {
1116                 I915_WRITE(PP_CONTROL,
1117                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1118         }
1119         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1120         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1121                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1122                 lvds_connector->lid_notifier.notifier_call = NULL;
1123         }
1124         drm_sysfs_connector_add(connector);
1125
1126         intel_panel_init(&intel_connector->panel, fixed_mode);
1127         intel_panel_setup_backlight(connector);
1128
1129         return;
1130
1131 failed:
1132         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1133         drm_connector_cleanup(connector);
1134         drm_encoder_cleanup(encoder);
1135         if (fixed_mode)
1136                 drm_mode_destroy(dev, fixed_mode);
1137         kfree(lvds_encoder);
1138         kfree(lvds_connector);
1139         return;
1140 }