sys/dev/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 #include "opt_drm.h"
  30
  31 #include <linux/dmi.h>
  32 #include <linux/i2c.h>
  33 #include <linux/vga_switcheroo.h>
  34 #include <drm/drmP.h>
  35 #include <drm/drm_atomic_helper.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_edid.h>
  38 #include "intel_drv.h"
  39 #include <drm/i915_drm.h>
  40 #include "i915_drv.h"
  41
  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         i915_reg_t reg;
  54         u32 a3_power;
  55
  56         struct intel_lvds_connector *attached_connector;
  57 };
  58
  59 static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  60 {
  61         return container_of(encoder, struct intel_lvds_encoder, base.base);
  62 }
  63
  64 static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  65 {
  66         return container_of(connector, struct intel_lvds_connector, base.base);
  67 }
  68
  69 static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  70                                     enum i915_pipe *pipe)
  71 {
  72         struct drm_device *dev = encoder->base.dev;
  73         struct drm_i915_private *dev_priv = dev->dev_private;
  74         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  75         enum intel_display_power_domain power_domain;
  76         u32 tmp;
  77         bool ret;
  78
  79         power_domain = intel_display_port_power_domain(encoder);
  80         if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
  81                 return false;
  82
  83         ret = false;
  84
  85         tmp = I915_READ(lvds_encoder->reg);
  86
  87         if (!(tmp & LVDS_PORT_EN))
  88                 goto out;
  89
  90         if (HAS_PCH_CPT(dev))
  91                 *pipe = PORT_TO_PIPE_CPT(tmp);
  92         else
  93                 *pipe = PORT_TO_PIPE(tmp);
  94
  95         ret = true;
  96
  97 out:
  98         intel_display_power_put(dev_priv, power_domain);
  99
 100         return ret;
 101 }
 102
 103 static void intel_lvds_get_config(struct intel_encoder *encoder,
 104                                   struct intel_crtc_state *pipe_config)
 105 {
 106         struct drm_device *dev = encoder->base.dev;
 107         struct drm_i915_private *dev_priv = dev->dev_private;
 108         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 109         u32 tmp, flags = 0;
 110
 111         tmp = I915_READ(lvds_encoder->reg);
 112         if (tmp & LVDS_HSYNC_POLARITY)
 113                 flags |= DRM_MODE_FLAG_NHSYNC;
 114         else
 115                 flags |= DRM_MODE_FLAG_PHSYNC;
 116         if (tmp & LVDS_VSYNC_POLARITY)
 117                 flags |= DRM_MODE_FLAG_NVSYNC;
 118         else
 119                 flags |= DRM_MODE_FLAG_PVSYNC;
 120
 121         pipe_config->base.adjusted_mode.flags |= flags;
 122
 123         if (INTEL_INFO(dev)->gen < 5)
 124                 pipe_config->gmch_pfit.lvds_border_bits =
 125                         tmp & LVDS_BORDER_ENABLE;
 126
 127         /* gen2/3 store dither state in pfit control, needs to match */
 128         if (INTEL_INFO(dev)->gen < 4) {
 129                 tmp = I915_READ(PFIT_CONTROL);
 130
 131                 pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
 132         }
 133
 134         pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
 135 }
 136
 137 static void intel_pre_enable_lvds(struct intel_encoder *encoder)
 138 {
 139         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 140         struct drm_device *dev = encoder->base.dev;
 141         struct drm_i915_private *dev_priv = dev->dev_private;
 142         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 143         const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 144         int pipe = crtc->pipe;
 145         u32 temp;
 146
 147         if (HAS_PCH_SPLIT(dev)) {
 148                 assert_fdi_rx_pll_disabled(dev_priv, pipe);
 149                 assert_shared_dpll_disabled(dev_priv,
 150                                             crtc->config->shared_dpll);
 151         } else {
 152                 assert_pll_disabled(dev_priv, pipe);
 153         }
 154
 155         temp = I915_READ(lvds_encoder->reg);
 156         temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
 157
 158         if (HAS_PCH_CPT(dev)) {
 159                 temp &= ~PORT_TRANS_SEL_MASK;
 160                 temp |= PORT_TRANS_SEL_CPT(pipe);
 161         } else {
 162                 if (pipe == 1) {
 163                         temp |= LVDS_PIPEB_SELECT;
 164                 } else {
 165                         temp &= ~LVDS_PIPEB_SELECT;
 166                 }
 167         }
 168
 169         /* set the corresponsding LVDS_BORDER bit */
 170         temp &= ~LVDS_BORDER_ENABLE;
 171         temp |= crtc->config->gmch_pfit.lvds_border_bits;
 172         /* Set the B0-B3 data pairs corresponding to whether we're going to
 173          * set the DPLLs for dual-channel mode or not.
 174          */
 175         if (lvds_encoder->is_dual_link)
 176                 temp |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
 177         else
 178                 temp &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
 179
 180         /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
 181          * appropriately here, but we need to look more thoroughly into how
 182          * panels behave in the two modes. For now, let's just maintain the
 183          * value we got from the BIOS.
 184          */
 185          temp &= ~LVDS_A3_POWER_MASK;
 186          temp |= lvds_encoder->a3_power;
 187
 188         /* Set the dithering flag on LVDS as needed, note that there is no
 189          * special lvds dither control bit on pch-split platforms, dithering is
 190          * only controlled through the PIPECONF reg. */
 191         if (IS_GEN4(dev_priv)) {
 192                 /* Bspec wording suggests that LVDS port dithering only exists
 193                  * for 18bpp panels. */
 194                 if (crtc->config->dither && crtc->config->pipe_bpp == 18)
 195                         temp |= LVDS_ENABLE_DITHER;
 196                 else
 197                         temp &= ~LVDS_ENABLE_DITHER;
 198         }
 199         temp &= ~(LVDS_HSYNC_POLARITY | LVDS_VSYNC_POLARITY);
 200         if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
 201                 temp |= LVDS_HSYNC_POLARITY;
 202         if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
 203                 temp |= LVDS_VSYNC_POLARITY;
 204
 205         I915_WRITE(lvds_encoder->reg, temp);
 206 }
 207
 208 /**
 209  * Sets the power state for the panel.
 210  */
 211 static void intel_enable_lvds(struct intel_encoder *encoder)
 212 {
 213         struct drm_device *dev = encoder->base.dev;
 214         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 215         struct intel_connector *intel_connector =
 216                 &lvds_encoder->attached_connector->base;
 217         struct drm_i915_private *dev_priv = dev->dev_private;
 218         i915_reg_t ctl_reg, stat_reg;
 219
 220         if (HAS_PCH_SPLIT(dev)) {
 221                 ctl_reg = PCH_PP_CONTROL;
 222                 stat_reg = PCH_PP_STATUS;
 223         } else {
 224                 ctl_reg = PP_CONTROL;
 225                 stat_reg = PP_STATUS;
 226         }
 227
 228         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) | LVDS_PORT_EN);
 229
 230         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 231         POSTING_READ(lvds_encoder->reg);
 232         if (intel_wait_for_register(dev_priv, stat_reg, PP_ON, PP_ON, 1000))
 233                 DRM_ERROR("timed out waiting for panel to power on\n");
 234
 235         intel_panel_enable_backlight(intel_connector);
 236 }
 237
 238 static void intel_disable_lvds(struct intel_encoder *encoder)
 239 {
 240         struct drm_device *dev = encoder->base.dev;
 241         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 242         struct drm_i915_private *dev_priv = dev->dev_private;
 243         i915_reg_t ctl_reg, stat_reg;
 244
 245         if (HAS_PCH_SPLIT(dev)) {
 246                 ctl_reg = PCH_PP_CONTROL;
 247                 stat_reg = PCH_PP_STATUS;
 248         } else {
 249                 ctl_reg = PP_CONTROL;
 250                 stat_reg = PP_STATUS;
 251         }
 252
 253         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 254         if (intel_wait_for_register(dev_priv, stat_reg, PP_ON, 0, 1000))
 255                 DRM_ERROR("timed out waiting for panel to power off\n");
 256
 257         I915_WRITE(lvds_encoder->reg, I915_READ(lvds_encoder->reg) & ~LVDS_PORT_EN);
 258         POSTING_READ(lvds_encoder->reg);
 259 }
 260
 261 static void gmch_disable_lvds(struct intel_encoder *encoder)
 262 {
 263         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 264         struct intel_connector *intel_connector =
 265                 &lvds_encoder->attached_connector->base;
 266
 267         intel_panel_disable_backlight(intel_connector);
 268
 269         intel_disable_lvds(encoder);
 270 }
 271
 272 static void pch_disable_lvds(struct intel_encoder *encoder)
 273 {
 274         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
 275         struct intel_connector *intel_connector =
 276                 &lvds_encoder->attached_connector->base;
 277
 278         intel_panel_disable_backlight(intel_connector);
 279 }
 280
 281 static void pch_post_disable_lvds(struct intel_encoder *encoder)
 282 {
 283         intel_disable_lvds(encoder);
 284 }
 285
 286 static enum drm_mode_status
 287 intel_lvds_mode_valid(struct drm_connector *connector,
 288                       struct drm_display_mode *mode)
 289 {
 290         struct intel_connector *intel_connector = to_intel_connector(connector);
 291         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 292         int max_pixclk = to_i915(connector->dev)->max_dotclk_freq;
 293
 294         if (mode->hdisplay > fixed_mode->hdisplay)
 295                 return MODE_PANEL;
 296         if (mode->vdisplay > fixed_mode->vdisplay)
 297                 return MODE_PANEL;
 298         if (fixed_mode->clock > max_pixclk)
 299                 return MODE_CLOCK_HIGH;
 300
 301         return MODE_OK;
 302 }
 303
 304 static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 305                                       struct intel_crtc_state *pipe_config)
 306 {
 307         struct drm_device *dev = intel_encoder->base.dev;
 308         struct intel_lvds_encoder *lvds_encoder =
 309                 to_lvds_encoder(&intel_encoder->base);
 310         struct intel_connector *intel_connector =
 311                 &lvds_encoder->attached_connector->base;
 312         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 313         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
 314         unsigned int lvds_bpp;
 315
 316         /* Should never happen!! */
 317         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 318                 DRM_ERROR("Can't support LVDS on pipe A\n");
 319                 return false;
 320         }
 321
 322         if (lvds_encoder->a3_power == LVDS_A3_POWER_UP)
 323                 lvds_bpp = 8*3;
 324         else
 325                 lvds_bpp = 6*3;
 326
 327         if (lvds_bpp != pipe_config->pipe_bpp && !pipe_config->bw_constrained) {
 328                 DRM_DEBUG_KMS("forcing display bpp (was %d) to LVDS (%d)\n",
 329                               pipe_config->pipe_bpp, lvds_bpp);
 330                 pipe_config->pipe_bpp = lvds_bpp;
 331         }
 332
 333         /*
 334          * We have timings from the BIOS for the panel, put them in
 335          * to the adjusted mode.  The CRTC will be set up for this mode,
 336          * with the panel scaling set up to source from the H/VDisplay
 337          * of the original mode.
 338          */
 339         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 340                                adjusted_mode);
 341
 342         if (HAS_PCH_SPLIT(dev)) {
 343                 pipe_config->has_pch_encoder = true;
 344
 345                 intel_pch_panel_fitting(intel_crtc, pipe_config,
 346                                         intel_connector->panel.fitting_mode);
 347         } else {
 348                 intel_gmch_panel_fitting(intel_crtc, pipe_config,
 349                                          intel_connector->panel.fitting_mode);
 350
 351         }
 352
 353         /*
 354          * XXX: It would be nice to support lower refresh rates on the
 355          * panels to reduce power consumption, and perhaps match the
 356          * user's requested refresh rate.
 357          */
 358
 359         return true;
 360 }
 361
 362 /**
 363  * Detect the LVDS connection.
 364  *
 365  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 366  * connected and closed means disconnected.  We also send hotplug events as
 367  * needed, using lid status notification from the input layer.
 368  */
 369 static enum drm_connector_status
 370 intel_lvds_detect(struct drm_connector *connector, bool force)
 371 {
 372         struct drm_device *dev = connector->dev;
 373         enum drm_connector_status status;
 374
 375         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 376                       connector->base.id, connector->name);
 377
 378         status = intel_panel_detect(dev);
 379         if (status != connector_status_unknown)
 380                 return status;
 381
 382         return connector_status_connected;
 383 }
 384
 385 /**
 386  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 387  */
 388 static int intel_lvds_get_modes(struct drm_connector *connector)
 389 {
 390         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
 391         struct drm_device *dev = connector->dev;
 392         struct drm_display_mode *mode;
 393
 394         /* use cached edid if we have one */
 395         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 396                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
 397
 398         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
 399         if (mode == NULL)
 400                 return 0;
 401
 402         drm_mode_probed_add(connector, mode);
 403         return 1;
 404 }
 405
 406 #if 0 /* unused */
 407 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 408 {
 409         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
 410         return 1;
 411 }
 412
 413 /* The GPU hangs up on these systems if modeset is performed on LID open */
 414 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 415         {
 416                 .callback = intel_no_modeset_on_lid_dmi_callback,
 417                 .ident = "Toshiba Tecra A11",
 418                 .matches = {
 419                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 420                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 421                 },
 422         },
 423
 424         { }     /* terminating entry */
 425 };
 426 #endif
 427
 428 #if 0
 429 /*
 430  * Lid events. Note the use of 'modeset':
 431  *  - we set it to MODESET_ON_LID_OPEN on lid close,
 432  *    and set it to MODESET_DONE on open
 433  *  - we use it as a "only once" bit (ie we ignore
 434  *    duplicate events where it was already properly set)
 435  *  - the suspend/resume paths will set it to
 436  *    MODESET_SUSPENDED and ignore the lid open event,
 437  *    because they restore the mode ("lid open").
 438  */
 439 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 440                             void *unused)
 441 {
 442         struct intel_lvds_connector *lvds_connector =
 443                 container_of(nb, struct intel_lvds_connector, lid_notifier);
 444         struct drm_connector *connector = &lvds_connector->base.base;
 445         struct drm_device *dev = connector->dev;
 446         struct drm_i915_private *dev_priv = dev->dev_private;
 447
 448         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 449                 return NOTIFY_OK;
 450
 451         mutex_lock(&dev_priv->modeset_restore_lock);
 452         if (dev_priv->modeset_restore == MODESET_SUSPENDED)
 453                 goto exit;
 454         /*
 455          * check and update the status of LVDS connector after receiving
 456          * the LID nofication event.
 457          */
 458         connector->status = connector->funcs->detect(connector, false);
 459
 460         /* Don't force modeset on machines where it causes a GPU lockup */
 461         if (dmi_check_system(intel_no_modeset_on_lid))
 462                 goto exit;
 463         if (!acpi_lid_open()) {
 464                 /* do modeset on next lid open event */
 465                 dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 466                 goto exit;
 467         }
 468
 469         if (dev_priv->modeset_restore == MODESET_DONE)
 470                 goto exit;
 471
 472         /*
 473          * Some old platform's BIOS love to wreak havoc while the lid is closed.
 474          * We try to detect this here and undo any damage. The split for PCH
 475          * platforms is rather conservative and a bit arbitrary expect that on
 476          * those platforms VGA disabling requires actual legacy VGA I/O access,
 477          * and as part of the cleanup in the hw state restore we also redisable
 478          * the vga plane.
 479          */
 480         if (!HAS_PCH_SPLIT(dev))
 481                 intel_display_resume(dev);
 482
 483         dev_priv->modeset_restore = MODESET_DONE;
 484
 485 exit:
 486         mutex_unlock(&dev_priv->modeset_restore_lock);
 487         return NOTIFY_OK;
 488 }
 489 #endif
 490
 491 /**
 492  * intel_lvds_destroy - unregister and free LVDS structures
 493  * @connector: connector to free
 494  *
 495  * Unregister the DDC bus for this connector then free the driver private
 496  * structure.
 497  */
 498 static void intel_lvds_destroy(struct drm_connector *connector)
 499 {
 500         struct intel_lvds_connector *lvds_connector =
 501                 to_lvds_connector(connector);
 502
 503 #if 0
 504         if (lvds_connector->lid_notifier.notifier_call)
 505                 acpi_lid_notifier_unregister(&lvds_connector->lid_notifier);
 506 #endif
 507
 508         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
 509                 kfree(lvds_connector->base.edid);
 510
 511         intel_panel_fini(&lvds_connector->base.panel);
 512
 513         drm_connector_cleanup(connector);
 514         kfree(connector);
 515 }
 516
 517 static int intel_lvds_set_property(struct drm_connector *connector,
 518                                    struct drm_property *property,
 519                                    uint64_t value)
 520 {
 521         struct intel_connector *intel_connector = to_intel_connector(connector);
 522         struct drm_device *dev = connector->dev;
 523
 524         if (property == dev->mode_config.scaling_mode_property) {
 525                 struct drm_crtc *crtc;
 526
 527                 if (value == DRM_MODE_SCALE_NONE) {
 528                         DRM_DEBUG_KMS("no scaling not supported\n");
 529                         return -EINVAL;
 530                 }
 531
 532                 if (intel_connector->panel.fitting_mode == value) {
 533                         /* the LVDS scaling property is not changed */
 534                         return 0;
 535                 }
 536                 intel_connector->panel.fitting_mode = value;
 537
 538                 crtc = intel_attached_encoder(connector)->base.crtc;
 539                 if (crtc && crtc->state->enable) {
 540                         /*
 541                          * If the CRTC is enabled, the display will be changed
 542                          * according to the new panel fitting mode.
 543                          */
 544                         intel_crtc_restore_mode(crtc);
 545                 }
 546         }
 547
 548         return 0;
 549 }
 550
 551 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 552         .get_modes = intel_lvds_get_modes,
 553         .mode_valid = intel_lvds_mode_valid,
 554 };
 555
 556 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 557         .dpms = drm_atomic_helper_connector_dpms,
 558         .detect = intel_lvds_detect,
 559         .fill_modes = drm_helper_probe_single_connector_modes,
 560         .set_property = intel_lvds_set_property,
 561         .atomic_get_property = intel_connector_atomic_get_property,
 562         .late_register = intel_connector_register,
 563         .early_unregister = intel_connector_unregister,
 564         .destroy = intel_lvds_destroy,
 565         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 566         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 567 };
 568
 569 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 570         .destroy = intel_encoder_destroy,
 571 };
 572
 573 static int intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 574 {
 575         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
 576         return 1;
 577 }
 578
 579 /* These systems claim to have LVDS, but really don't */
 580 static const struct dmi_system_id intel_no_lvds[] = {
 581         {
 582                 .callback = intel_no_lvds_dmi_callback,
 583                 .ident = "Apple Mac Mini (Core series)",
 584                 .matches = {
 585                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 586                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 587                 },
 588         },
 589         {
 590                 .callback = intel_no_lvds_dmi_callback,
 591                 .ident = "Apple Mac Mini (Core 2 series)",
 592                 .matches = {
 593                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 594                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 595                 },
 596         },
 597         {
 598                 .callback = intel_no_lvds_dmi_callback,
 599                 .ident = "MSI IM-945GSE-A",
 600                 .matches = {
 601                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 602                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 603                 },
 604         },
 605         {
 606                 .callback = intel_no_lvds_dmi_callback,
 607                 .ident = "Dell Studio Hybrid",
 608                 .matches = {
 609                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 610                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 611                 },
 612         },
 613         {
 614                 .callback = intel_no_lvds_dmi_callback,
 615                 .ident = "Dell OptiPlex FX170",
 616                 .matches = {
 617                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 618                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
 619                 },
 620         },
 621         {
 622                 .callback = intel_no_lvds_dmi_callback,
 623                 .ident = "AOpen Mini PC",
 624                 .matches = {
 625                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 626                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 627                 },
 628         },
 629         {
 630                 .callback = intel_no_lvds_dmi_callback,
 631                 .ident = "AOpen Mini PC MP915",
 632                 .matches = {
 633                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 634                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 635                 },
 636         },
 637         {
 638                 .callback = intel_no_lvds_dmi_callback,
 639                 .ident = "AOpen i915GMm-HFS",
 640                 .matches = {
 641                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 642                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 643                 },
 644         },
 645         {
 646                 .callback = intel_no_lvds_dmi_callback,
 647                 .ident = "AOpen i45GMx-I",
 648                 .matches = {
 649                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 650                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
 651                 },
 652         },
 653         {
 654                 .callback = intel_no_lvds_dmi_callback,
 655                 .ident = "Aopen i945GTt-VFA",
 656                 .matches = {
 657                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 658                 },
 659         },
 660         {
 661                 .callback = intel_no_lvds_dmi_callback,
 662                 .ident = "Clientron U800",
 663                 .matches = {
 664                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 665                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 666                 },
 667         },
 668         {
 669                 .callback = intel_no_lvds_dmi_callback,
 670                 .ident = "Clientron E830",
 671                 .matches = {
 672                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 673                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
 674                 },
 675         },
 676         {
 677                 .callback = intel_no_lvds_dmi_callback,
 678                 .ident = "Asus EeeBox PC EB1007",
 679                 .matches = {
 680                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 681                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 682                 },
 683         },
 684         {
 685                 .callback = intel_no_lvds_dmi_callback,
 686                 .ident = "Asus AT5NM10T-I",
 687                 .matches = {
 688                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 689                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
 690                 },
 691         },
 692         {
 693                 .callback = intel_no_lvds_dmi_callback,
 694                 .ident = "Hewlett-Packard HP t5740",
 695                 .matches = {
 696                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 697                         DMI_MATCH(DMI_PRODUCT_NAME, " t5740"),
 698                 },
 699         },
 700         {
 701                 .callback = intel_no_lvds_dmi_callback,
 702                 .ident = "Hewlett-Packard t5745",
 703                 .matches = {
 704                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 705                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
 706                 },
 707         },
 708         {
 709                 .callback = intel_no_lvds_dmi_callback,
 710                 .ident = "Hewlett-Packard st5747",
 711                 .matches = {
 712                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 713                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
 714                 },
 715         },
 716         {
 717                 .callback = intel_no_lvds_dmi_callback,
 718                 .ident = "MSI Wind Box DC500",
 719                 .matches = {
 720                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 721                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
 722                 },
 723         },
 724         {
 725                 .callback = intel_no_lvds_dmi_callback,
 726                 .ident = "Gigabyte GA-D525TUD",
 727                 .matches = {
 728                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
 729                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
 730                 },
 731         },
 732         {
 733                 .callback = intel_no_lvds_dmi_callback,
 734                 .ident = "Supermicro X7SPA-H",
 735                 .matches = {
 736                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 737                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
 738                 },
 739         },
 740         {
 741                 .callback = intel_no_lvds_dmi_callback,
 742                 .ident = "Fujitsu Esprimo Q900",
 743                 .matches = {
 744                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
 745                         DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Q900"),
 746                 },
 747         },
 748         {
 749                 .callback = intel_no_lvds_dmi_callback,
 750                 .ident = "Intel D410PT",
 751                 .matches = {
 752                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 753                         DMI_MATCH(DMI_BOARD_NAME, "D410PT"),
 754                 },
 755         },
 756         {
 757                 .callback = intel_no_lvds_dmi_callback,
 758                 .ident = "Intel D425KT",
 759                 .matches = {
 760                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 761                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D425KT"),
 762                 },
 763         },
 764         {
 765                 .callback = intel_no_lvds_dmi_callback,
 766                 .ident = "Intel D510MO",
 767                 .matches = {
 768                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 769                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
 770                 },
 771         },
 772         {
 773                 .callback = intel_no_lvds_dmi_callback,
 774                 .ident = "Intel D525MW",
 775                 .matches = {
 776                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
 777                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "D525MW"),
 778                 },
 779         },
 780
 781         { }     /* terminating entry */
 782 };
 783
 784 static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
 785 {
 786         DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
 787         return 1;
 788 }
 789
 790 static const struct dmi_system_id intel_dual_link_lvds[] = {
 791         {
 792                 .callback = intel_dual_link_lvds_callback,
 793                 .ident = "Apple MacBook Pro 15\" (2010)",
 794                 .matches = {
 795                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 796                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro6,2"),
 797                 },
 798         },
 799         {
 800                 .callback = intel_dual_link_lvds_callback,
 801                 .ident = "Apple MacBook Pro 15\" (2011)",
 802                 .matches = {
 803                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 804                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
 805                 },
 806         },
 807         {
 808                 .callback = intel_dual_link_lvds_callback,
 809                 .ident = "Apple MacBook Pro 15\" (2012)",
 810                 .matches = {
 811                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 812                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,1"),
 813                 },
 814         },
 815         { }     /* terminating entry */
 816 };
 817
 818 struct intel_encoder *intel_get_lvds_encoder(struct drm_device *dev)
 819 {
 820         struct intel_encoder *intel_encoder;
 821
 822         for_each_intel_encoder(dev, intel_encoder)
 823                 if (intel_encoder->type == INTEL_OUTPUT_LVDS)
 824                         return intel_encoder;
 825
 826         return NULL;
 827 }
 828
 829 bool intel_is_dual_link_lvds(struct drm_device *dev)
 830 {
 831         struct intel_encoder *encoder = intel_get_lvds_encoder(dev);
 832
 833         return encoder && to_lvds_encoder(&encoder->base)->is_dual_link;
 834 }
 835
 836 static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
 837 {
 838         struct drm_device *dev = lvds_encoder->base.base.dev;
 839         unsigned int val;
 840         struct drm_i915_private *dev_priv = dev->dev_private;
 841
 842         /* use the module option value if specified */
 843         if (i915.lvds_channel_mode > 0)
 844                 return i915.lvds_channel_mode == 2;
 845
 846         /* single channel LVDS is limited to 112 MHz */
 847         if (lvds_encoder->attached_connector->base.panel.fixed_mode->clock
 848             > 112999)
 849                 return true;
 850
 851         if (dmi_check_system(intel_dual_link_lvds))
 852                 return true;
 853
 854         /* BIOS should set the proper LVDS register value at boot, but
 855          * in reality, it doesn't set the value when the lid is closed;
 856          * we need to check "the value to be set" in VBT when LVDS
 857          * register is uninitialized.
 858          */
 859         val = I915_READ(lvds_encoder->reg);
 860         if (!(val & ~(LVDS_PIPE_MASK | LVDS_DETECTED)))
 861                 val = dev_priv->vbt.bios_lvds_val;
 862
 863         return (val & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP;
 864 }
 865
 866 static bool intel_lvds_supported(struct drm_device *dev)
 867 {
 868         /* With the introduction of the PCH we gained a dedicated
 869          * LVDS presence pin, use it. */
 870         if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 871                 return true;
 872
 873         /* Otherwise LVDS was only attached to mobile products,
 874          * except for the inglorious 830gm */
 875         if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 876                 return true;
 877
 878         return false;
 879 }
 880
 881 /**
 882  * intel_lvds_init - setup LVDS connectors on this device
 883  * @dev: drm device
 884  *
 885  * Create the connector, register the LVDS DDC bus, and try to figure out what
 886  * modes we can display on the LVDS panel (if present).
 887  */
 888 void intel_lvds_init(struct drm_device *dev)
 889 {
 890         struct drm_i915_private *dev_priv = dev->dev_private;
 891         struct intel_lvds_encoder *lvds_encoder;
 892         struct intel_encoder *intel_encoder;
 893         struct intel_lvds_connector *lvds_connector;
 894         struct intel_connector *intel_connector;
 895         struct drm_connector *connector;
 896         struct drm_encoder *encoder;
 897         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 898         struct drm_display_mode *fixed_mode = NULL;
 899         struct drm_display_mode *downclock_mode = NULL;
 900         struct edid *edid;
 901         struct drm_crtc *crtc;
 902         i915_reg_t lvds_reg;
 903         u32 lvds;
 904         int pipe;
 905         u8 pin;
 906
 907         /*
 908          * Unlock registers and just leave them unlocked. Do this before
 909          * checking quirk lists to avoid bogus WARNINGs.
 910          */
 911         if (HAS_PCH_SPLIT(dev)) {
 912                 I915_WRITE(PCH_PP_CONTROL,
 913                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
 914         } else if (INTEL_INFO(dev_priv)->gen < 5) {
 915                 I915_WRITE(PP_CONTROL,
 916                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
 917         }
 918         if (!intel_lvds_supported(dev))
 919                 return;
 920
 921         /* Skip init on machines we know falsely report LVDS */
 922         if (dmi_check_system(intel_no_lvds))
 923                 return;
 924
 925         if (HAS_PCH_SPLIT(dev))
 926                 lvds_reg = PCH_LVDS;
 927         else
 928                 lvds_reg = LVDS;
 929
 930         lvds = I915_READ(lvds_reg);
 931
 932         if (HAS_PCH_SPLIT(dev)) {
 933                 if ((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         pin = GMBUS_PIN_PANEL;
 942         if (!intel_bios_is_lvds_present(dev_priv, &pin)) {
 943                 if ((lvds & LVDS_PORT_EN) == 0) {
 944                         DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 945                         return;
 946                 }
 947                 DRM_DEBUG_KMS("LVDS is not present in VBT, but enabled anyway\n");
 948         }
 949
 950          /* Set the Panel Power On/Off timings if uninitialized. */
 951         if (INTEL_INFO(dev_priv)->gen < 5 &&
 952             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 953                 /* Set T2 to 40ms and T5 to 200ms */
 954                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 955
 956                 /* Set T3 to 35ms and Tx to 200ms */
 957                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 958
 959                 DRM_DEBUG_KMS("Panel power timings uninitialized, setting defaults\n");
 960         }
 961
 962         lvds_encoder = kzalloc(sizeof(*lvds_encoder), GFP_KERNEL);
 963         if (!lvds_encoder)
 964                 return;
 965
 966         lvds_connector = kzalloc(sizeof(*lvds_connector), GFP_KERNEL);
 967         if (!lvds_connector) {
 968                 kfree(lvds_encoder);
 969                 return;
 970         }
 971
 972         if (intel_connector_init(&lvds_connector->base) < 0) {
 973                 kfree(lvds_connector);
 974                 kfree(lvds_encoder);
 975                 return;
 976         }
 977
 978         lvds_encoder->attached_connector = lvds_connector;
 979
 980         intel_encoder = &lvds_encoder->base;
 981         encoder = &intel_encoder->base;
 982         intel_connector = &lvds_connector->base;
 983         connector = &intel_connector->base;
 984         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 985                            DRM_MODE_CONNECTOR_LVDS);
 986
 987         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 988                          DRM_MODE_ENCODER_LVDS, "LVDS");
 989
 990         intel_encoder->enable = intel_enable_lvds;
 991         intel_encoder->pre_enable = intel_pre_enable_lvds;
 992         intel_encoder->compute_config = intel_lvds_compute_config;
 993         if (HAS_PCH_SPLIT(dev_priv)) {
 994                 intel_encoder->disable = pch_disable_lvds;
 995                 intel_encoder->post_disable = pch_post_disable_lvds;
 996         } else {
 997                 intel_encoder->disable = gmch_disable_lvds;
 998         }
 999         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
1000         intel_encoder->get_config = intel_lvds_get_config;
1001         intel_connector->get_hw_state = intel_connector_get_hw_state;
1002
1003         intel_connector_attach_encoder(intel_connector, intel_encoder);
1004         intel_encoder->type = INTEL_OUTPUT_LVDS;
1005
1006         intel_encoder->cloneable = 0;
1007         if (HAS_PCH_SPLIT(dev))
1008                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
1009         else if (IS_GEN4(dev))
1010                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
1011         else
1012                 intel_encoder->crtc_mask = (1 << 1);
1013
1014         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
1015         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1016         connector->interlace_allowed = false;
1017         connector->doublescan_allowed = false;
1018
1019         lvds_encoder->reg = lvds_reg;
1020
1021         /* create the scaling mode property */
1022         drm_mode_create_scaling_mode_property(dev);
1023         drm_object_attach_property(&connector->base,
1024                                       dev->mode_config.scaling_mode_property,
1025                                       DRM_MODE_SCALE_ASPECT);
1026         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
1027         /*
1028          * LVDS discovery:
1029          * 1) check for EDID on DDC
1030          * 2) check for VBT data
1031          * 3) check to see if LVDS is already on
1032          *    if none of the above, no panel
1033          * 4) make sure lid is open
1034          *    if closed, act like it's not there for now
1035          */
1036
1037         /*
1038          * Attempt to get the fixed panel mode from DDC.  Assume that the
1039          * preferred mode is the right one.
1040          */
1041         mutex_lock(&dev->mode_config.mutex);
1042         if (vga_switcheroo_handler_flags() & VGA_SWITCHEROO_CAN_SWITCH_DDC)
1043                 edid = drm_get_edid_switcheroo(connector,
1044                                     intel_gmbus_get_adapter(dev_priv, pin));
1045         else
1046                 edid = drm_get_edid(connector,
1047                                     intel_gmbus_get_adapter(dev_priv, pin));
1048         if (edid) {
1049                 if (drm_add_edid_modes(connector, edid)) {
1050                         drm_mode_connector_update_edid_property(connector,
1051                                                                 edid);
1052                 } else {
1053                         kfree(edid);
1054                         edid = ERR_PTR(-EINVAL);
1055                 }
1056         } else {
1057                 edid = ERR_PTR(-ENOENT);
1058         }
1059         lvds_connector->base.edid = edid;
1060
1061         list_for_each_entry(scan, &connector->probed_modes, head) {
1062                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1063                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
1064                         drm_mode_debug_printmodeline(scan);
1065
1066                         fixed_mode = drm_mode_duplicate(dev, scan);
1067                         if (fixed_mode)
1068                                 goto out;
1069                 }
1070         }
1071
1072         /* Failed to get EDID, what about VBT? */
1073         if (dev_priv->vbt.lfp_lvds_vbt_mode) {
1074                 DRM_DEBUG_KMS("using mode from VBT: ");
1075                 drm_mode_debug_printmodeline(dev_priv->vbt.lfp_lvds_vbt_mode);
1076
1077                 fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
1078                 if (fixed_mode) {
1079                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1080                         connector->display_info.width_mm = fixed_mode->width_mm;
1081                         connector->display_info.height_mm = fixed_mode->height_mm;
1082                         goto out;
1083                 }
1084         }
1085
1086         /*
1087          * If we didn't get EDID, try checking if the panel is already turned
1088          * on.  If so, assume that whatever is currently programmed is the
1089          * correct mode.
1090          */
1091
1092         /* Ironlake: FIXME if still fail, not try pipe mode now */
1093         if (HAS_PCH_SPLIT(dev))
1094                 goto failed;
1095
1096         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1097         crtc = intel_get_crtc_for_pipe(dev, pipe);
1098
1099         if (crtc && (lvds & LVDS_PORT_EN)) {
1100                 fixed_mode = intel_crtc_mode_get(dev, crtc);
1101                 if (fixed_mode) {
1102                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
1103                         drm_mode_debug_printmodeline(fixed_mode);
1104                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
1105                         goto out;
1106                 }
1107         }
1108
1109         /* If we still don't have a mode after all that, give up. */
1110         if (!fixed_mode)
1111                 goto failed;
1112
1113 out:
1114         mutex_unlock(&dev->mode_config.mutex);
1115
1116         intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
1117         intel_panel_setup_backlight(connector, INVALID_PIPE);
1118
1119         lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
1120         DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
1121                       lvds_encoder->is_dual_link ? "dual" : "single");
1122
1123         lvds_encoder->a3_power = lvds & LVDS_A3_POWER_MASK;
1124
1125 #if 0
1126         lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
1127         if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
1128                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1129                 lvds_connector->lid_notifier.notifier_call = NULL;
1130         }
1131         drm_connector_register(connector);
1132 #endif
1133
1134         return;
1135
1136 failed:
1137         mutex_unlock(&dev->mode_config.mutex);
1138
1139         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1140         drm_connector_cleanup(connector);
1141         drm_encoder_cleanup(encoder);
1142         kfree(lvds_encoder);
1143         kfree(lvds_connector);
1144         return;
1145 }