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_connector *intel_connector =
 210                 &lvds_encoder->attached_connector->base;
 211         struct drm_i915_private *dev_priv = dev->dev_private;
 212         u32 ctl_reg, stat_reg;
 213
 214         if (HAS_PCH_SPLIT(dev)) {
 215                 ctl_reg = PCH_PP_CONTROL;
 216                 stat_reg = PCH_PP_STATUS;
 217         } else {
 218                 ctl_reg = PP_CONTROL;
 219                 stat_reg = PP_STATUS;
 220         }
 221
 222         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 223
 224         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 225         POSTING_READ(lvds_encoder->reg);
 226         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 227                 DRM_ERROR("timed out waiting for panel to power on\n");
 228
 229         intel_panel_enable_backlight(intel_connector);
 230 }
 231
 232 static void intel_disable_lvds(struct intel_encoder *encoder)
 233 {
 234         struct drm_device *dev = encoder->base.dev;
 235         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 236         struct intel_connector *intel_connector =
 237                 &lvds_encoder->attached_connector->base;
 238         struct drm_i915_private *dev_priv = dev->dev_private;
 239         u32 ctl_reg, stat_reg;
 240
 241         if (HAS_PCH_SPLIT(dev)) {
 242                 ctl_reg = PCH_PP_CONTROL;
 243                 stat_reg = PCH_PP_STATUS;
 244         } else {
 245                 ctl_reg = PP_CONTROL;
 246                 stat_reg = PP_STATUS;
 247         }
 248
 249         intel_panel_disable_backlight(intel_connector);
 250
 251         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 252         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
 253                 DRM_ERROR("timed out waiting for panel to power off\n");
 254
 255         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 256         POSTING_READ(lvds_encoder->reg);
 257 }
 258
 259 static enum drm_mode_status
 260 intel_lvds_mode_valid(struct drm_connector *connector,
 261                       struct drm_display_mode *mode)
 262 {
 263         struct intel_connector *intel_connector = to_intel_connector(connector);
 264         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 265
 266         if (mode->hdisplay > fixed_mode->hdisplay)
 267                 return MODE_PANEL;
 268         if (mode->vdisplay > fixed_mode->vdisplay)
 269                 return MODE_PANEL;
 270
 271         return MODE_OK;
 272 }
 273
 274 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 275                                       struct intel_crtc_config *pipe_config)
 276 {
 277         struct drm_device *dev = intel_encoder->base.dev;
 278         struct drm_i915_private *dev_priv = dev->dev_private;
 279         struct intel_lvds_encoder *lvds_encoder =
 280                 to_lvds_encoder(&intel_encoder->base);
 281         struct intel_connector *intel_connector =
 282                 &lvds_encoder->attached_connector->base;
 283         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 284         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
 285         unsigned int lvds_bpp;
 286
 287         /* Should never happen!! */
 288         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 289                 DRM_ERROR("Can't support LVDS on pipe A\n");
 290                 return false;
 291         }
 292
 293         if ((I915_READ(lvds_encoder->reg) & LVDS_A3_POWER_MASK) ==
 294             LVDS_A3_POWER_UP)
 295                 lvds_bpp = 8*3;
 296         else
 297                 lvds_bpp = 6*3;
 298
 299         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 300                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 301                               pipe_config->pipe_bpp, lvds_bpp);
 302                 pipe_config->pipe_bpp = lvds_bpp;
 303         }
 304
 305         /*
 306          * We have timings from the BIOS for the panel, put them in
 307          * to the adjusted mode.  The CRTC will be set up for this mode,
 308          * with the panel scaling set up to source from the H/VDisplay
 309          * of the original mode.
 310          */
 311         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 312                                adjusted_mode);
 313
 314         if (HAS_PCH_SPLIT(dev)) {
 315                 pipe_config->has_pch_encoder = true;
 316
 317                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 318                                         intel_connector->panel.fitting_mode);
 319         } else {
 320                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 321                                          intel_connector->panel.fitting_mode);
 322
 323         }
 324
 325         /*
 326          * XXX: It would be nice to support lower refresh rates on the
 327          * panels to reduce power consumption, and perhaps match the
 328          * user's requested refresh rate.
 329          */
 330
 331         return true;
 332 }
 333
 334 static void intel_lvds_mode_set(struct intel_encoder *encoder)
 335 {
 336         /*
 337          * We don't do anything here, the LVDS port is fully set up in the pre
 338          * enable hook - the ordering constraints for enabling the lvds port vs.
 339          * enabling the display pll are too strict.
 340          */
 341 }
 342
 343 /**
 344  * Detect the LVDS connection.
 345  *
 346  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 347  * connected and closed means disconnected.  We also send hotplug events as
 348  * needed, using lid status notification from the input layer.
 349  */
 350 static enum drm_connector_status
 351 intel_lvds_detect(struct drm_connector *connector, bool force)
 352 {
 353         struct drm_device *dev = connector->dev;
 354         enum drm_connector_status status;
 355
 356         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 357                       connector->base.id, drm_get_connector_name(connector));
 358
 359         status = intel_panel_detect(dev);
 360         if (status != connector_status_unknown)
 361                 return status;
 362
 363         return connector_status_connected;
 364 }
 365
 366 /**
 367  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 368  */
 369 static int intel_lvds_get_modes(struct drm_connector *connector)
 370 {
 371         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 372         struct drm_device *dev = connector->dev;
 373         struct drm_display_mode *mode;
 374
 375         /* use cached edid if we have one */
 376         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 377                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 378
 379         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 380         if (mode == NULL)
 381                 return 0;
 382
 383         drm_mode_probed_add(connector, mode);
 384         return 1;
 385 }
 386
 387 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 388 {
 389         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 390         return 1;
 391 }
 392
 393 /* The GPU hangs up on these systems if modeset is performed on LID open */
 394 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 395         {
 396                 .callback = intel_no_modeset_on_lid_dmi_callback,
 397                 .ident = "Toshiba Tecra A11",
 398                 .matches = {
 399                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 400                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 401                 },
 402         },
 403
 404         { }     /* terminating entry */
 405 };
 406
 407 /*
 408  * Lid events. Note the use of 'modeset':
 409  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 410  *    and set it to MODESET_DONE on open
 411  *  - we use it as a "only once" bit (ie we ignore
 412  *    duplicate events where it was already properly set)
 413  *  - the suspend/resume paths will set it to
 414  *    MODESET_SUSPENDED and ignore the lid open event,
 415  *    because they restore the mode ("lid open").
 416  */
 417 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 418                             void *unused)
 419 {
 420         struct intel_lvds_connector *lvds_connector =
 421                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 422         struct drm_connector *connector = &lvds_connector->base.base;
 423         struct drm_device *dev = connector->dev;
 424         struct drm_i915_private *dev_priv = dev->dev_private;
 425
 426         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 427                 return NOTIFY_OK;
 428
 429         mutex_lock(&dev_priv->modeset_restore_lock);
 430         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 431                 goto exit;
 432         /*
 433          * check and update the status of LVDS connector after receiving
 434          * the LID nofication event.
 435          */
 436         connector->status = connector->funcs->detect(connector, false);
 437
 438         /* Don't force modeset on machines where it causes a GPU lockup */
 439         if (dmi_check_system(intel_no_modeset_on_lid))
 440                 goto exit;
 441         if (!acpi_lid_open()) {
 442                 /* do modeset on next lid open event */
 443                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 444                 goto exit;
 445         }
 446
 447         if (dev_priv->modeset_restore == MODESET_DONE)
 448                 goto exit;
 449
 450         /*
 451          * Some old platform's BIOS love to wreak havoc while the lid is closed.
 452          * We try to detect this here and undo any damage. The split for PCH
 453          * platforms is rather conservative and a bit arbitrary expect that on
 454          * those platforms VGA disabling requires actual legacy VGA I/O access,
 455          * and as part of the cleanup in the hw state restore we also redisable
 456          * the vga plane.
 457          */
 458         if (!HAS_PCH_SPLIT(dev)) {
 459                 drm_modeset_lock_all(dev);
 460                 intel_modeset_setup_hw_state(dev, true);
 461                 drm_modeset_unlock_all(dev);
 462         }
 463
 464         dev_priv->modeset_restore = MODESET_DONE;
 465
 466 exit:
 467         mutex_unlock(&dev_priv->modeset_restore_lock);
 468         return NOTIFY_OK;
 469 }
 470
 471 /**
 472  * intel_lvds_destroy - unregister and free LVDS structures
 473  * @connector: connector to free
 474  *
 475  * Unregister the DDC bus for this connector then free the driver private
 476  * structure.
 477  */
 478 static void intel_lvds_destroy(struct drm_connector *connector)
 479 {
 480         struct intel_lvds_connector *lvds_connector =
 481                 to_lvds_connector(connector);
 482
 483         if (lvds_connector->lid_notifier.notifier_call)
 484                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 485
 486         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 487                 kfree(lvds_connector->base.edid);
 488
 489         intel_panel_fini(&lvds_connector->base.panel);
 490
 491         drm_connector_cleanup(connector);
 492         kfree(connector);
 493 }
 494
 495 static int intel_lvds_set_property(struct drm_connector *connector,
 496                                    struct drm_property *property,
 497                                    uint64_t value)
 498 {
 499         struct intel_connector *intel_connector = to_intel_connector(connector);
 500         struct drm_device *dev = connector->dev;
 501
 502         if (property == dev->mode_config.scaling_mode_property) {
 503                 struct drm_crtc *crtc;
 504
 505                 if (value == DRM_MODE_SCALE_NONE) {
 506                         DRM_DEBUG_KMS("no scaling not supported\n");
 507                         return -EINVAL;
 508                 }
 509
 510                 if (intel_connector->panel.fitting_mode == value) {
 511                         /* the LVDS scaling property is not changed */
 512                         return 0;
 513                 }
 514                 intel_connector->panel.fitting_mode = value;
 515
 516                 crtc = intel_attached_encoder(connector)->base.crtc;
 517                 if (crtc && crtc->enabled) {
 518                         /*
 519                          * If the CRTC is enabled, the display will be changed
 520                          * according to the new panel fitting mode.
 521                          */
 522                         intel_crtc_restore_mode(crtc);
 523                 }
 524         }
 525
 526         return 0;
 527 }
 528
 529 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 530         .get_modes = intel_lvds_get_modes,
 531         .mode_valid = intel_lvds_mode_valid,
 532         .best_encoder = intel_best_encoder,
 533 };
 534
 535 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 536         .dpms = intel_connector_dpms,
 537         .detect = intel_lvds_detect,
 538         .fill_modes = drm_helper_probe_single_connector_modes,
 539         .set_property = intel_lvds_set_property,
 540         .destroy = intel_lvds_destroy,
 541 };
 542
 543 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 544         .destroy = intel_encoder_destroy,
 545 };
 546
 547 static int intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 548 {
 549         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 550         return 1;
 551 }
 552
 553 /* These systems claim to have LVDS, but really don't */
 554 static const struct dmi_system_id intel_no_lvds[] = {
 555         {
 556                 .callback = intel_no_lvds_dmi_callback,
 557                 .ident = "Apple Mac Mini (Core series)",
 558                 .matches = {
 559                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 560                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 561                 },
 562         },
 563         {
 564                 .callback = intel_no_lvds_dmi_callback,
 565                 .ident = "Apple Mac Mini (Core 2 series)",
 566                 .matches = {
 567                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 568                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 569                 },
 570         },
 571         {
 572                 .callback = intel_no_lvds_dmi_callback,
 573                 .ident = "MSI IM-945GSE-A",
 574                 .matches = {
 575                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 576                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 577                 },
 578         },
 579         {
 580                 .callback = intel_no_lvds_dmi_callback,
 581                 .ident = "Dell Studio Hybrid",
 582                 .matches = {
 583                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 584                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 585                 },
 586         },
 587         {
 588                 .callback = intel_no_lvds_dmi_callback,
 589                 .ident = "Dell OptiPlex FX170",
 590                 .matches = {
 591                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 592                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 593                 },
 594         },
 595         {
 596                 .callback = intel_no_lvds_dmi_callback,
 597                 .ident = "AOpen Mini PC",
 598                 .matches = {
 599                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 600                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 601                 },
 602         },
 603         {
 604                 .callback = intel_no_lvds_dmi_callback,
 605                 .ident = "AOpen Mini PC MP915",
 606                 .matches = {
 607                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 608                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 609                 },
 610         },
 611         {
 612                 .callback = intel_no_lvds_dmi_callback,
 613                 .ident = "AOpen i915GMm-HFS",
 614                 .matches = {
 615                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 616                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 617                 },
 618         },
 619         {
 620                 .callback = intel_no_lvds_dmi_callback,
 621                 .ident = "AOpen i45GMx-I",
 622                 .matches = {
 623                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 624                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 625                 },
 626         },
 627         {
 628                 .callback = intel_no_lvds_dmi_callback,
 629                 .ident = "Aopen i945GTt-VFA",
 630                 .matches = {
 631                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 632                 },
 633         },
 634         {
 635                 .callback = intel_no_lvds_dmi_callback,
 636                 .ident = "Clientron U800",
 637                 .matches = {
 638                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 639                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 640                 },
 641         },
 642         {
 643                 .callback = intel_no_lvds_dmi_callback,
 644                 .ident = "Clientron E830",
 645                 .matches = {
 646                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 647                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 648                 },
 649         },
 650         {
 651                 .callback = intel_no_lvds_dmi_callback,
 652                 .ident = "Asus EeeBox PC EB1007",
 653                 .matches = {
 654                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 655                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 656                 },
 657         },
 658         {
 659                 .callback = intel_no_lvds_dmi_callback,
 660                 .ident = "Asus AT5NM10T-I",
 661                 .matches = {
 662                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 663                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 664                 },
 665         },
 666         {
 667                 .callback = intel_no_lvds_dmi_callback,
 668                 .ident = "Hewlett-Packard HP t5740",
 669                 .matches = {
 670                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 671                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 672                 },
 673         },
 674         {
 675                 .callback = intel_no_lvds_dmi_callback,
 676                 .ident = "Hewlett-Packard t5745",
 677                 .matches = {
 678                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 679                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 680                 },
 681         },
 682         {
 683                 .callback = intel_no_lvds_dmi_callback,
 684                 .ident = "Hewlett-Packard st5747",
 685                 .matches = {
 686                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 687                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 688                 },
 689         },
 690         {
 691                 .callback = intel_no_lvds_dmi_callback,
 692                 .ident = "MSI Wind Box DC500",
 693                 .matches = {
 694                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 695                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 696                 },
 697         },
 698         {
 699                 .callback = intel_no_lvds_dmi_callback,
 700                 .ident = "Gigabyte GA-D525TUD",
 701                 .matches = {
 702                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 703                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 704                 },
 705         },
 706         {
 707                 .callback = intel_no_lvds_dmi_callback,
 708                 .ident = "Supermicro X7SPA-H",
 709                 .matches = {
 710                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 711                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 712                 },
 713         },
 714         {
 715                 .callback = intel_no_lvds_dmi_callback,
 716                 .ident = "Fujitsu Esprimo Q900",
 717                 .matches = {
 718                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 719                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 720                 },
 721         },
 722         {
 723                 .callback = intel_no_lvds_dmi_callback,
 724                 .ident = "Intel D410PT",
 725                 .matches = {
 726                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 727                         DMI_MATCH(DMI_BOARD_NAME, "D410PT"),
 728                 },
 729         },
 730         {
 731                 .callback = intel_no_lvds_dmi_callback,
 732                 .ident = "Intel D425KT",
 733                 .matches = {
 734                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 735                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D425KT"),
 736                 },
 737         },
 738         {
 739                 .callback = intel_no_lvds_dmi_callback,
 740                 .ident = "Intel D510MO",
 741                 .matches = {
 742                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 743                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 744                 },
 745         },
 746         {
 747                 .callback = intel_no_lvds_dmi_callback,
 748                 .ident = "Intel D525MW",
 749                 .matches = {
 750                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 751                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 752                 },
 753         },
 754
 755         { }     /* terminating entry */
 756 };
 757
 758 /*
 759  * Enumerate the child dev array parsed from VBT to check whether
 760  * the LVDS is present.
 761  * If it is present, return 1.
 762  * If it is not present, return false.
 763  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 764  */
 765 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 766                                    u8 *i2c_pin)
 767 {
 768         struct drm_i915_private *dev_priv = dev->dev_private;
 769         int i;
 770
 771         if (!dev_priv->vbt.child_dev_num)
 772                 return true;
 773
 774         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 775                 union child_device_config *uchild = dev_priv->vbt.child_dev + i;
 776                 struct old_child_dev_config *child = &uchild->old;
 777
 778                 /* If the device type is not LFP, continue.
 779                  * We have to check both the new identifiers as well as the
 780                  * old for compatibility with some BIOSes.
 781                  */
 782                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 783                     child->device_type != DEVICE_TYPE_LFP)
 784                         continue;
 785
 786                 if (intel_gmbus_is_port_valid(child->i2c_pin))
 787                         *i2c_pin = child->i2c_pin;
 788
 789                 /* However, we cannot trust the BIOS writers to populate
 790                  * the VBT correctly.  Since LVDS requires additional
 791                  * information from AIM blocks, a non-zero addin offset is
 792                  * a good indicator that the LVDS is actually present.
 793                  */
 794                 if (child->addin_offset)
 795                         return true;
 796
 797                 /* But even then some BIOS writers perform some black magic
 798                  * and instantiate the device without reference to any
 799                  * additional data.  Trust that if the VBT was written into
 800                  * the OpRegion then they have validated the LVDS's existence.
 801                  */
 802                 if (dev_priv->opregion.vbt)
 803                         return true;
 804         }
 805
 806         return false;
 807 }
 808
 809 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 810 {
 811         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 812         return 1;
 813 }
 814
 815 static const struct dmi_system_id intel_dual_link_lvds[] = {
 816         {
 817                 .callback = intel_dual_link_lvds_callback,
 818                 .ident = "Apple MacBook Pro (Core i5/i7 Series)",
 819                 .matches = {
 820                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 821                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 822                 },
 823         },
 824         { }     /* terminating entry */
 825 };
 826
 827 bool intel_is_dual_link_lvds(struct drm_device *dev)
 828 {
 829         struct intel_encoder *encoder;
 830         struct intel_lvds_encoder *lvds_encoder;
 831
 832         list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 833                             base.head) {
 834                 if (encoder->type == INTEL_OUTPUT_LVDS) {
 835                         lvds_encoder = to_lvds_encoder(&encoder->base);
 836
 837                         return lvds_encoder->is_dual_link;
 838                 }
 839         }
 840
 841         return false;
 842 }
 843
 844 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 845 {
 846         struct drm_device *dev = lvds_encoder->base.base.dev;
 847         unsigned int val;
 848         struct drm_i915_private *dev_priv = dev->dev_private;
 849
 850         /* use the module option value if specified */
 851         if (i915_lvds_channel_mode > 0)
 852                 return i915_lvds_channel_mode == 2;
 853
 854         if (dmi_check_system(intel_dual_link_lvds))
 855                 return true;
 856
 857         /* BIOS should set the proper LVDS register value at boot, but
 858          * in reality, it doesn't set the value when the lid is closed;
 859          * we need to check "the value to be set" in VBT when LVDS
 860          * register is uninitialized.
 861          */
 862         val = I915_READ(lvds_encoder->reg);
 863         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 864                 val = dev_priv->vbt.bios_lvds_val;
 865
 866         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 867 }
 868
 869 static bool intel_lvds_supported(struct drm_device *dev)
 870 {
 871         /* With the introduction of the PCH we gained a dedicated
 872          * LVDS presence pin, use it. */
 873         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 874                 return true;
 875
 876         /* Otherwise LVDS was only attached to mobile products,
 877          * except for the inglorious 830gm */
 878         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 879                 return true;
 880
 881         return false;
 882 }
 883
 884 /**
 885  * intel_lvds_init - setup LVDS connectors on this device
 886  * @dev: drm device
 887  *
 888  * Create the connector, register the LVDS DDC bus, and try to figure out what
 889  * modes we can display on the LVDS panel (if present).
 890  */
 891 void intel_lvds_init(struct drm_device *dev)
 892 {
 893         struct drm_i915_private *dev_priv = dev->dev_private;
 894         struct intel_lvds_encoder *lvds_encoder;
 895         struct intel_encoder *intel_encoder;
 896         struct intel_lvds_connector *lvds_connector;
 897         struct intel_connector *intel_connector;
 898         struct drm_connector *connector;
 899         struct drm_encoder *encoder;
 900         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 901         struct drm_display_mode *fixed_mode = NULL;
 902         struct edid *edid;
 903         struct drm_crtc *crtc;
 904         u32 lvds;
 905         int pipe;
 906         u8 pin;
 907
 908         /*
 909          * Unlock registers and just leave them unlocked. Do this before
 910          * checking quirk lists to avoid bogus WARNINGs.
 911          */
 912         if (HAS_PCH_SPLIT(dev)) {
 913                 I915_WRITE(PCH_PP_CONTROL,
 914                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
 915         } else {
 916                 I915_WRITE(PP_CONTROL,
 917                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
 918         }
 919         if (!intel_lvds_supported(dev))
 920                 return;
 921
 922         /* Skip init on machines we know falsely report LVDS */
 923         if (dmi_check_system(intel_no_lvds))
 924                 return;
 925
 926         pin = GMBUS_PORT_PANEL;
 927         if (!lvds_is_present_in_vbt(dev, &pin)) {
 928                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 929                 return;
 930         }
 931
 932         if (HAS_PCH_SPLIT(dev)) {
 933                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 934                         return;
 935                 if (dev_priv->vbt.edp_support) {
 936                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 937                         return;
 938                 }
 939         }
 940
 941         lvds_encoder = kzalloc(sizeof(*lvds_encoder), GFP_KERNEL);
 942         if (!lvds_encoder)
 943                 return;
 944
 945         lvds_connector = kzalloc(sizeof(*lvds_connector), GFP_KERNEL);
 946         if (!lvds_connector) {
 947                 kfree(lvds_encoder);
 948                 return;
 949         }
 950
 951         lvds_encoder->attached_connector = lvds_connector;
 952
 953         intel_encoder = &lvds_encoder->base;
 954         encoder = &intel_encoder->base;
 955         intel_connector = &lvds_connector->base;
 956         connector = &intel_connector->base;
 957         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 958                            DRM_MODE_CONNECTOR_LVDS);
 959
 960         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 961                          DRM_MODE_ENCODER_LVDS);
 962
 963         intel_encoder->enable = intel_enable_lvds;
 964         intel_encoder->pre_enable = intel_pre_enable_lvds;
 965         intel_encoder->compute_config = intel_lvds_compute_config;
 966         intel_encoder->mode_set = intel_lvds_mode_set;
 967         intel_encoder->disable = intel_disable_lvds;
 968         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
 969         intel_encoder->get_config = intel_lvds_get_config;
 970         intel_connector->get_hw_state = intel_connector_get_hw_state;
 971         intel_connector->unregister = intel_connector_unregister;
 972
 973         intel_connector_attach_encoder(intel_connector, intel_encoder);
 974         intel_encoder->type = INTEL_OUTPUT_LVDS;
 975
 976         intel_encoder->cloneable = false;
 977         if (HAS_PCH_SPLIT(dev))
 978                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 979         else if (IS_GEN4(dev))
 980                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 981         else
 982                 intel_encoder->crtc_mask = (1 << 1);
 983
 984         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 985         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 986         connector->interlace_allowed = false;
 987         connector->doublescan_allowed = false;
 988
 989         if (HAS_PCH_SPLIT(dev)) {
 990                 lvds_encoder->reg = PCH_LVDS;
 991         } else {
 992                 lvds_encoder->reg = LVDS;
 993         }
 994
 995         /* create the scaling mode property */
 996         drm_mode_create_scaling_mode_property(dev);
 997         drm_object_attach_property(&connector->base,
 998                                       dev->mode_config.scaling_mode_property,
 999                                       DRM_MODE_SCALE_ASPECT);
1000         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1001         /*
1002          * LVDS discovery:
1003          * 1) check for EDID on DDC
1004          * 2) check for VBT data
1005          * 3) check to see if LVDS is already on
1006          *    if none of the above, no panel
1007          * 4) make sure lid is open
1008          *    if closed, act like it's not there for now
1009          */
1010
1011         /*
1012          * Attempt to get the fixed panel mode from DDC.  Assume that the
1013          * preferred mode is the right one.
1014          */
1015         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
1016         if (edid) {
1017                 if (drm_add_edid_modes(connector, edid)) {
1018                         drm_mode_connector_update_edid_property(connector,
1019                                                                 edid);
1020                 } else {
1021                         kfree(edid);
1022                         edid = ERR_PTR(-EINVAL);
1023                 }
1024         } else {
1025                 edid = ERR_PTR(-ENOENT);
1026         }
1027         lvds_connector->base.edid = edid;
1028
1029         if (IS_ERR_OR_NULL(edid)) {
1030                 /* Didn't get an EDID, so
1031                  * Set wide sync ranges so we get all modes
1032                  * handed to valid_mode for checking
1033                  */
1034                 connector->display_info.min_vfreq = 0;
1035                 connector->display_info.max_vfreq = 200;
1036                 connector->display_info.min_hfreq = 0;
1037                 connector->display_info.max_hfreq = 200;
1038         }
1039
1040         list_for_each_entry(scan, &connector->probed_modes, head) {
1041                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1042                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1043                         drm_mode_debug_printmodeline(scan);
1044
1045                         fixed_mode = drm_mode_duplicate(dev, scan);
1046                         if (fixed_mode) {
1047                                 intel_connector->panel.downclock_mode =
1048                                         intel_find_panel_downclock(dev,
1049                                         fixed_mode, connector);
1050                                 if (intel_connector->panel.downclock_mode !=
1051                                         NULL && i915_lvds_downclock) {
1052                                         /* We found the downclock for LVDS. */
1053                                         dev_priv->lvds_downclock_avail = true;
1054                                         dev_priv->lvds_downclock =
1055                                                 intel_connector->panel.
1056                                                 downclock_mode->clock;
1057                                         DRM_DEBUG_KMS("LVDS downclock is found"
1058                                         " in EDID. Normal clock %dKhz, "
1059                                         "downclock %dKhz\n",
1060                                         fixed_mode->clock,
1061                                         dev_priv->lvds_downclock);
1062                                 }
1063                                 goto out;
1064                         }
1065                 }
1066         }
1067
1068         /* Failed to get EDID, what about VBT? */
1069         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1070                 DRM_DEBUG_KMS("using mode from VBT: ");
1071                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1072
1073                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1074                 if (fixed_mode) {
1075                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1076                         goto out;
1077                 }
1078         }
1079
1080         /*
1081          * If we didn't get EDID, try checking if the panel is already turned
1082          * on.  If so, assume that whatever is currently programmed is the
1083          * correct mode.
1084          */
1085
1086         /* Ironlake: FIXME if still fail, not try pipe mode now */
1087         if (HAS_PCH_SPLIT(dev))
1088                 goto failed;
1089
1090         lvds = I915_READ(LVDS);
1091         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1092         crtc = intel_get_crtc_for_pipe(dev, pipe);
1093
1094         if (crtc && (lvds & LVDS_PORT_EN)) {
1095                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1096                 if (fixed_mode) {
1097                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1098                         drm_mode_debug_printmodeline(fixed_mode);
1099                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1100                         goto out;
1101                 }
1102         }
1103
1104         /* If we still don't have a mode after all that, give up. */
1105         if (!fixed_mode)
1106                 goto failed;
1107
1108 out:
1109         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1110         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1111                       lvds_encoder->is_dual_link ? "dual" : "single");
1112
1113         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1114         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1115                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1116                 lvds_connector->lid_notifier.notifier_call = NULL;
1117         }
1118         drm_sysfs_connector_add(connector);
1119
1120         intel_panel_init(&intel_connector->panel, fixed_mode);
1121         intel_panel_setup_backlight(connector);
1122
1123         return;
1124
1125 failed:
1126         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1127         drm_connector_cleanup(connector);
1128         drm_encoder_cleanup(encoder);
1129         if (fixed_mode)
1130                 drm_mode_destroy(dev, fixed_mode);
1131         kfree(lvds_encoder);
1132         kfree(lvds_connector);
1133         return;
1134 }