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 "drmP.h"
  35 #include "drm.h"
  36 #include "drm_crtc.h"
  37 #include "drm_edid.h"
  38 #include "intel_drv.h"
  39 #include "i915_drm.h"
  40 #include "i915_drv.h"
  41 #include <linux/acpi.h>
  42
  43 /* Private structure for the integrated LVDS support */
  44 struct intel_lvds {
  45         struct intel_encoder base;
  46
  47         struct edid *edid;
  48
  49         int fitting_mode;
  50         u32 pfit_control;
  51         u32 pfit_pgm_ratios;
  52         bool pfit_dirty;
  53
  54         struct drm_display_mode *fixed_mode;
  55 };
  56
  57 static struct intel_lvds *to_intel_lvds(struct drm_encoder *encoder)
  58 {
  59         return container_of(encoder, struct intel_lvds, base.base);
  60 }
  61
  62 static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
  63 {
  64         return container_of(intel_attached_encoder(connector),
  65                             struct intel_lvds, base);
  66 }
  67
  68 /**
  69  * Sets the power state for the panel.
  70  */
  71 static void intel_lvds_enable(struct intel_lvds *intel_lvds)
  72 {
  73         struct drm_device *dev = intel_lvds->base.base.dev;
  74         struct drm_i915_private *dev_priv = dev->dev_private;
  75         u32 ctl_reg, lvds_reg;
  76
  77         if (HAS_PCH_SPLIT(dev)) {
  78                 ctl_reg = PCH_PP_CONTROL;
  79                 lvds_reg = PCH_LVDS;
  80         } else {
  81                 ctl_reg = PP_CONTROL;
  82                 lvds_reg = LVDS;
  83         }
  84
  85         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
  86
  87         if (intel_lvds->pfit_dirty) {
  88                 /*
  89                  * Enable automatic panel scaling so that non-native modes
  90                  * fill the screen.  The panel fitter should only be
  91                  * adjusted whilst the pipe is disabled, according to
  92                  * register description and PRM.
  93                  */
  94                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
  95                               intel_lvds->pfit_control,
  96                               intel_lvds->pfit_pgm_ratios);
  97                 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000)) {
  98                         DRM_ERROR("timed out waiting for panel to power off\n");
  99                 } else {
 100                         I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
 101                         I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
 102                         intel_lvds->pfit_dirty = false;
 103                 }
 104         }
 105
 106         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
 107         POSTING_READ(lvds_reg);
 108
 109         intel_panel_enable_backlight(dev);
 110 }
 111
 112 static void intel_lvds_disable(struct intel_lvds *intel_lvds)
 113 {
 114         struct drm_device *dev = intel_lvds->base.base.dev;
 115         struct drm_i915_private *dev_priv = dev->dev_private;
 116         u32 ctl_reg, lvds_reg;
 117
 118         if (HAS_PCH_SPLIT(dev)) {
 119                 ctl_reg = PCH_PP_CONTROL;
 120                 lvds_reg = PCH_LVDS;
 121         } else {
 122                 ctl_reg = PP_CONTROL;
 123                 lvds_reg = LVDS;
 124         }
 125
 126         intel_panel_disable_backlight(dev);
 127
 128         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 129
 130         if (intel_lvds->pfit_control) {
 131                 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
 132                         DRM_ERROR("timed out waiting for panel to power off\n");
 133
 134                 I915_WRITE(PFIT_CONTROL, 0);
 135                 intel_lvds->pfit_dirty = true;
 136         }
 137
 138         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 139         POSTING_READ(lvds_reg);
 140 }
 141
 142 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
 143 {
 144         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 145
 146         if (mode == DRM_MODE_DPMS_ON)
 147                 intel_lvds_enable(intel_lvds);
 148         else
 149                 intel_lvds_disable(intel_lvds);
 150
 151         /* XXX: We never power down the LVDS pairs. */
 152 }
 153
 154 static int intel_lvds_mode_valid(struct drm_connector *connector,
 155                                  struct drm_display_mode *mode)
 156 {
 157         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 158         struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
 159
 160         if (mode->hdisplay > fixed_mode->hdisplay)
 161                 return MODE_PANEL;
 162         if (mode->vdisplay > fixed_mode->vdisplay)
 163                 return MODE_PANEL;
 164
 165         return MODE_OK;
 166 }
 167
 168 static void
 169 centre_horizontally(struct drm_display_mode *mode,
 170                     int width)
 171 {
 172         u32 border, sync_pos, blank_width, sync_width;
 173
 174         /* keep the hsync and hblank widths constant */
 175         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 176         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 177         sync_pos = (blank_width - sync_width + 1) / 2;
 178
 179         border = (mode->hdisplay - width + 1) / 2;
 180         border += border & 1; /* make the border even */
 181
 182         mode->crtc_hdisplay = width;
 183         mode->crtc_hblank_start = width + border;
 184         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 185
 186         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 187         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 188 }
 189
 190 static void
 191 centre_vertically(struct drm_display_mode *mode,
 192                   int height)
 193 {
 194         u32 border, sync_pos, blank_width, sync_width;
 195
 196         /* keep the vsync and vblank widths constant */
 197         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 198         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 199         sync_pos = (blank_width - sync_width + 1) / 2;
 200
 201         border = (mode->vdisplay - height + 1) / 2;
 202
 203         mode->crtc_vdisplay = height;
 204         mode->crtc_vblank_start = height + border;
 205         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 206
 207         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 208         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 209 }
 210
 211 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 212 {
 213         /*
 214          * Floating point operation is not supported. So the FACTOR
 215          * is defined, which can avoid the floating point computation
 216          * when calculating the panel ratio.
 217          */
 218 #define ACCURACY 12
 219 #define FACTOR (1 << ACCURACY)
 220         u32 ratio = source * FACTOR / target;
 221         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 222 }
 223
 224 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 225                                   struct drm_display_mode *mode,
 226                                   struct drm_display_mode *adjusted_mode)
 227 {
 228         struct drm_device *dev = encoder->dev;
 229         struct drm_i915_private *dev_priv = dev->dev_private;
 230         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 231         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 232         struct drm_encoder *tmp_encoder;
 233         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 234         int pipe;
 235
 236         /* Should never happen!! */
 237         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
 238                 DRM_ERROR("Can't support LVDS on pipe A\n");
 239                 return false;
 240         }
 241
 242         /* Should never happen!! */
 243         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 244                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
 245                         DRM_ERROR("Can't enable LVDS and another "
 246                                "encoder on the same pipe\n");
 247                         return false;
 248                 }
 249         }
 250
 251         /*
 252          * We have timings from the BIOS for the panel, put them in
 253          * to the adjusted mode.  The CRTC will be set up for this mode,
 254          * with the panel scaling set up to source from the H/VDisplay
 255          * of the original mode.
 256          */
 257         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
 258
 259         if (HAS_PCH_SPLIT(dev)) {
 260                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
 261                                         mode, adjusted_mode);
 262                 return true;
 263         }
 264
 265         /* Native modes don't need fitting */
 266         if (adjusted_mode->hdisplay == mode->hdisplay &&
 267             adjusted_mode->vdisplay == mode->vdisplay)
 268                 goto out;
 269
 270         /* 965+ wants fuzzy fitting */
 271         if (INTEL_INFO(dev)->gen >= 4)
 272                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 273                                  PFIT_FILTER_FUZZY);
 274
 275         /*
 276          * Enable automatic panel scaling for non-native modes so that they fill
 277          * the screen.  Should be enabled before the pipe is enabled, according
 278          * to register description and PRM.
 279          * Change the value here to see the borders for debugging
 280          */
 281         for_each_pipe(pipe)
 282                 I915_WRITE(BCLRPAT(pipe), 0);
 283
 284         switch (intel_lvds->fitting_mode) {
 285         case DRM_MODE_SCALE_CENTER:
 286                 /*
 287                  * For centered modes, we have to calculate border widths &
 288                  * heights and modify the values programmed into the CRTC.
 289                  */
 290                 centre_horizontally(adjusted_mode, mode->hdisplay);
 291                 centre_vertically(adjusted_mode, mode->vdisplay);
 292                 border = LVDS_BORDER_ENABLE;
 293                 break;
 294
 295         case DRM_MODE_SCALE_ASPECT:
 296                 /* Scale but preserve the aspect ratio */
 297                 if (INTEL_INFO(dev)->gen >= 4) {
 298                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 299                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 300
 301                         /* 965+ is easy, it does everything in hw */
 302                         if (scaled_width > scaled_height)
 303                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
 304                         else if (scaled_width < scaled_height)
 305                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
 306                         else if (adjusted_mode->hdisplay != mode->hdisplay)
 307                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 308                 } else {
 309                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 310                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 311                         /*
 312                          * For earlier chips we have to calculate the scaling
 313                          * ratio by hand and program it into the
 314                          * PFIT_PGM_RATIO register
 315                          */
 316                         if (scaled_width > scaled_height) { /* pillar */
 317                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 318
 319                                 border = LVDS_BORDER_ENABLE;
 320                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 321                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 322                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 323                                                             bits << PFIT_VERT_SCALE_SHIFT);
 324                                         pfit_control |= (PFIT_ENABLE |
 325                                                          VERT_INTERP_BILINEAR |
 326                                                          HORIZ_INTERP_BILINEAR);
 327                                 }
 328                         } else if (scaled_width < scaled_height) { /* letter */
 329                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 330
 331                                 border = LVDS_BORDER_ENABLE;
 332                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 333                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 334                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 335                                                             bits << PFIT_VERT_SCALE_SHIFT);
 336                                         pfit_control |= (PFIT_ENABLE |
 337                                                          VERT_INTERP_BILINEAR |
 338                                                          HORIZ_INTERP_BILINEAR);
 339                                 }
 340                         } else
 341                                 /* Aspects match, Let hw scale both directions */
 342                                 pfit_control |= (PFIT_ENABLE |
 343                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 344                                                  VERT_INTERP_BILINEAR |
 345                                                  HORIZ_INTERP_BILINEAR);
 346                 }
 347                 break;
 348
 349         case DRM_MODE_SCALE_FULLSCREEN:
 350                 /*
 351                  * Full scaling, even if it changes the aspect ratio.
 352                  * Fortunately this is all done for us in hw.
 353                  */
 354                 if (mode->vdisplay != adjusted_mode->vdisplay ||
 355                     mode->hdisplay != adjusted_mode->hdisplay) {
 356                         pfit_control |= PFIT_ENABLE;
 357                         if (INTEL_INFO(dev)->gen >= 4)
 358                                 pfit_control |= PFIT_SCALING_AUTO;
 359                         else
 360                                 pfit_control |= (VERT_AUTO_SCALE |
 361                                                  VERT_INTERP_BILINEAR |
 362                                                  HORIZ_AUTO_SCALE |
 363                                                  HORIZ_INTERP_BILINEAR);
 364                 }
 365                 break;
 366
 367         default:
 368                 break;
 369         }
 370
 371 out:
 372         /* If not enabling scaling, be consistent and always use 0. */
 373         if ((pfit_control & PFIT_ENABLE) == 0) {
 374                 pfit_control = 0;
 375                 pfit_pgm_ratios = 0;
 376         }
 377
 378         /* Make sure pre-965 set dither correctly */
 379         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
 380                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 381
 382         if (pfit_control != intel_lvds->pfit_control ||
 383             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
 384                 intel_lvds->pfit_control = pfit_control;
 385                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
 386                 intel_lvds->pfit_dirty = true;
 387         }
 388         dev_priv->lvds_border_bits = border;
 389
 390         /*
 391          * XXX: It would be nice to support lower refresh rates on the
 392          * panels to reduce power consumption, and perhaps match the
 393          * user's requested refresh rate.
 394          */
 395
 396         return true;
 397 }
 398
 399 static void intel_lvds_prepare(struct drm_encoder *encoder)
 400 {
 401         struct drm_device *dev = encoder->dev;
 402         struct drm_i915_private *dev_priv = dev->dev_private;
 403         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 404
 405         /* We try to do the minimum that is necessary in order to unlock
 406          * the registers for mode setting.
 407          *
 408          * On Ironlake, this is quite simple as we just set the unlock key
 409          * and ignore all subtleties. (This may cause some issues...)
 410          *
 411          * Prior to Ironlake, we must disable the pipe if we want to adjust
 412          * the panel fitter. However at all other times we can just reset
 413          * the registers regardless.
 414          */
 415
 416         if (HAS_PCH_SPLIT(dev)) {
 417                 I915_WRITE(PCH_PP_CONTROL,
 418                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
 419         } else if (intel_lvds->pfit_dirty) {
 420                 I915_WRITE(PP_CONTROL,
 421                            (I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS)
 422                            & ~POWER_TARGET_ON);
 423         } else {
 424                 I915_WRITE(PP_CONTROL,
 425                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
 426         }
 427 }
 428
 429 static void intel_lvds_commit(struct drm_encoder *encoder)
 430 {
 431         struct drm_device *dev = encoder->dev;
 432         struct drm_i915_private *dev_priv = dev->dev_private;
 433         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
 434
 435         /* Undo any unlocking done in prepare to prevent accidental
 436          * adjustment of the registers.
 437          */
 438         if (HAS_PCH_SPLIT(dev)) {
 439                 u32 val = I915_READ(PCH_PP_CONTROL);
 440                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
 441                         I915_WRITE(PCH_PP_CONTROL, val & 0x3);
 442         } else {
 443                 u32 val = I915_READ(PP_CONTROL);
 444                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
 445                         I915_WRITE(PP_CONTROL, val & 0x3);
 446         }
 447
 448         /* Always do a full power on as we do not know what state
 449          * we were left in.
 450          */
 451         intel_lvds_enable(intel_lvds);
 452 }
 453
 454 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 455                                 struct drm_display_mode *mode,
 456                                 struct drm_display_mode *adjusted_mode)
 457 {
 458         /*
 459          * The LVDS pin pair will already have been turned on in the
 460          * intel_crtc_mode_set since it has a large impact on the DPLL
 461          * settings.
 462          */
 463 }
 464
 465 /**
 466  * Detect the LVDS connection.
 467  *
 468  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 469  * connected and closed means disconnected.  We also send hotplug events as
 470  * needed, using lid status notification from the input layer.
 471  */
 472 static enum drm_connector_status
 473 intel_lvds_detect(struct drm_connector *connector, bool force)
 474 {
 475         struct drm_device *dev = connector->dev;
 476         enum drm_connector_status status;
 477
 478         status = intel_panel_detect(dev);
 479         if (status != connector_status_unknown)
 480                 return status;
 481
 482         return connector_status_connected;
 483 }
 484
 485 /**
 486  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 487  */
 488 static int intel_lvds_get_modes(struct drm_connector *connector)
 489 {
 490         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 491         struct drm_device *dev = connector->dev;
 492         struct drm_display_mode *mode;
 493
 494         if (intel_lvds->edid)
 495                 return drm_add_edid_modes(connector, intel_lvds->edid);
 496
 497         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
 498         if (mode == NULL)
 499                 return 0;
 500
 501         drm_mode_probed_add(connector, mode);
 502         return 1;
 503 }
 504
 505 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 506 {
 507         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
 508         return 1;
 509 }
 510
 511 /* The GPU hangs up on these systems if modeset is performed on LID open */
 512 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 513         {
 514                 .callback = intel_no_modeset_on_lid_dmi_callback,
 515                 .ident = "Toshiba Tecra A11",
 516                 .matches = {
 517                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 518                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 519                 },
 520         },
 521
 522         { }     /* terminating entry */
 523 };
 524
 525 /*
 526  * Lid events. Note the use of 'modeset_on_lid':
 527  *  - we set it on lid close, and reset it on open
 528  *  - we use it as a "only once" bit (ie we ignore
 529  *    duplicate events where it was already properly
 530  *    set/reset)
 531  *  - the suspend/resume paths will also set it to
 532  *    zero, since they restore the mode ("lid open").
 533  */
 534 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 535                             void *unused)
 536 {
 537         struct drm_i915_private *dev_priv =
 538                 container_of(nb, struct drm_i915_private, lid_notifier);
 539         struct drm_device *dev = dev_priv->dev;
 540         struct drm_connector *connector = dev_priv->int_lvds_connector;
 541
 542         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
 543                 return NOTIFY_OK;
 544
 545         /*
 546          * check and update the status of LVDS connector after receiving
 547          * the LID nofication event.
 548          */
 549         if (connector)
 550                 connector->status = connector->funcs->detect(connector,
 551                                                              false);
 552
 553         /* Don't force modeset on machines where it causes a GPU lockup */
 554         if (dmi_check_system(intel_no_modeset_on_lid))
 555                 return NOTIFY_OK;
 556         if (!acpi_lid_open()) {
 557                 dev_priv->modeset_on_lid = 1;
 558                 return NOTIFY_OK;
 559         }
 560
 561         if (!dev_priv->modeset_on_lid)
 562                 return NOTIFY_OK;
 563
 564         dev_priv->modeset_on_lid = 0;
 565
 566         mutex_lock(&dev->mode_config.mutex);
 567         drm_helper_resume_force_mode(dev);
 568         mutex_unlock(&dev->mode_config.mutex);
 569
 570         return NOTIFY_OK;
 571 }
 572
 573 /**
 574  * intel_lvds_destroy - unregister and free LVDS structures
 575  * @connector: connector to free
 576  *
 577  * Unregister the DDC bus for this connector then free the driver private
 578  * structure.
 579  */
 580 static void intel_lvds_destroy(struct drm_connector *connector)
 581 {
 582         struct drm_device *dev = connector->dev;
 583         struct drm_i915_private *dev_priv = dev->dev_private;
 584
 585         if (dev_priv->lid_notifier.notifier_call)
 586                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 587         drm_sysfs_connector_remove(connector);
 588         drm_connector_cleanup(connector);
 589         kfree(connector);
 590 }
 591
 592 static int intel_lvds_set_property(struct drm_connector *connector,
 593                                    struct drm_property *property,
 594                                    uint64_t value)
 595 {
 596         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
 597         struct drm_device *dev = connector->dev;
 598
 599         if (property == dev->mode_config.scaling_mode_property) {
 600                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
 601
 602                 if (value == DRM_MODE_SCALE_NONE) {
 603                         DRM_DEBUG_KMS("no scaling not supported\n");
 604                         return -EINVAL;
 605                 }
 606
 607                 if (intel_lvds->fitting_mode == value) {
 608                         /* the LVDS scaling property is not changed */
 609                         return 0;
 610                 }
 611                 intel_lvds->fitting_mode = value;
 612                 if (crtc && crtc->enabled) {
 613                         /*
 614                          * If the CRTC is enabled, the display will be changed
 615                          * according to the new panel fitting mode.
 616                          */
 617                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
 618                                 crtc->x, crtc->y, crtc->fb);
 619                 }
 620         }
 621
 622         return 0;
 623 }
 624
 625 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 626         .dpms = intel_lvds_dpms,
 627         .mode_fixup = intel_lvds_mode_fixup,
 628         .prepare = intel_lvds_prepare,
 629         .mode_set = intel_lvds_mode_set,
 630         .commit = intel_lvds_commit,
 631 };
 632
 633 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 634         .get_modes = intel_lvds_get_modes,
 635         .mode_valid = intel_lvds_mode_valid,
 636         .best_encoder = intel_best_encoder,
 637 };
 638
 639 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 640         .dpms = drm_helper_connector_dpms,
 641         .detect = intel_lvds_detect,
 642         .fill_modes = drm_helper_probe_single_connector_modes,
 643         .set_property = intel_lvds_set_property,
 644         .destroy = intel_lvds_destroy,
 645 };
 646
 647 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 648         .destroy = intel_encoder_destroy,
 649 };
 650
 651 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 652 {
 653         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
 654         return 1;
 655 }
 656
 657 /* These systems claim to have LVDS, but really don't */
 658 static const struct dmi_system_id intel_no_lvds[] = {
 659         {
 660                 .callback = intel_no_lvds_dmi_callback,
 661                 .ident = "Apple Mac Mini (Core series)",
 662                 .matches = {
 663                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 664                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 665                 },
 666         },
 667         {
 668                 .callback = intel_no_lvds_dmi_callback,
 669                 .ident = "Apple Mac Mini (Core 2 series)",
 670                 .matches = {
 671                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 672                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 673                 },
 674         },
 675         {
 676                 .callback = intel_no_lvds_dmi_callback,
 677                 .ident = "MSI IM-945GSE-A",
 678                 .matches = {
 679                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 680                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 681                 },
 682         },
 683         {
 684                 .callback = intel_no_lvds_dmi_callback,
 685                 .ident = "Dell Studio Hybrid",
 686                 .matches = {
 687                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 688                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 689                 },
 690         },
 691         {
 692                 .callback = intel_no_lvds_dmi_callback,
 693                 .ident = "AOpen Mini PC",
 694                 .matches = {
 695                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 696                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 697                 },
 698         },
 699         {
 700                 .callback = intel_no_lvds_dmi_callback,
 701                 .ident = "AOpen Mini PC MP915",
 702                 .matches = {
 703                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 704                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 705                 },
 706         },
 707         {
 708                 .callback = intel_no_lvds_dmi_callback,
 709                 .ident = "AOpen i915GMm-HFS",
 710                 .matches = {
 711                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 712                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
 713                 },
 714         },
 715         {
 716                 .callback = intel_no_lvds_dmi_callback,
 717                 .ident = "Aopen i945GTt-VFA",
 718                 .matches = {
 719                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 720                 },
 721         },
 722         {
 723                 .callback = intel_no_lvds_dmi_callback,
 724                 .ident = "Clientron U800",
 725                 .matches = {
 726                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 727                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 728                 },
 729         },
 730         {
 731                 .callback = intel_no_lvds_dmi_callback,
 732                 .ident = "Asus EeeBox PC EB1007",
 733                 .matches = {
 734                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 735                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
 736                 },
 737         },
 738
 739         { }     /* terminating entry */
 740 };
 741
 742 /**
 743  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 744  * @dev: drm device
 745  * @connector: LVDS connector
 746  *
 747  * Find the reduced downclock for LVDS in EDID.
 748  */
 749 static void intel_find_lvds_downclock(struct drm_device *dev,
 750                                       struct drm_display_mode *fixed_mode,
 751                                       struct drm_connector *connector)
 752 {
 753         struct drm_i915_private *dev_priv = dev->dev_private;
 754         struct drm_display_mode *scan;
 755         int temp_downclock;
 756
 757         temp_downclock = fixed_mode->clock;
 758         list_for_each_entry(scan, &connector->probed_modes, head) {
 759                 /*
 760                  * If one mode has the same resolution with the fixed_panel
 761                  * mode while they have the different refresh rate, it means
 762                  * that the reduced downclock is found for the LVDS. In such
 763                  * case we can set the different FPx0/1 to dynamically select
 764                  * between low and high frequency.
 765                  */
 766                 if (scan->hdisplay == fixed_mode->hdisplay &&
 767                     scan->hsync_start == fixed_mode->hsync_start &&
 768                     scan->hsync_end == fixed_mode->hsync_end &&
 769                     scan->htotal == fixed_mode->htotal &&
 770                     scan->vdisplay == fixed_mode->vdisplay &&
 771                     scan->vsync_start == fixed_mode->vsync_start &&
 772                     scan->vsync_end == fixed_mode->vsync_end &&
 773                     scan->vtotal == fixed_mode->vtotal) {
 774                         if (scan->clock < temp_downclock) {
 775                                 /*
 776                                  * The downclock is already found. But we
 777                                  * expect to find the lower downclock.
 778                                  */
 779                                 temp_downclock = scan->clock;
 780                         }
 781                 }
 782         }
 783         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
 784                 /* We found the downclock for LVDS. */
 785                 dev_priv->lvds_downclock_avail = 1;
 786                 dev_priv->lvds_downclock = temp_downclock;
 787                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 788                               "Normal clock %dKhz, downclock %dKhz\n",
 789                               fixed_mode->clock, temp_downclock);
 790         }
 791 }
 792
 793 /*
 794  * Enumerate the child dev array parsed from VBT to check whether
 795  * the LVDS is present.
 796  * If it is present, return 1.
 797  * If it is not present, return false.
 798  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 799  */
 800 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 801                                    u8 *i2c_pin)
 802 {
 803         struct drm_i915_private *dev_priv = dev->dev_private;
 804         int i;
 805
 806         if (!dev_priv->child_dev_num)
 807                 return true;
 808
 809         for (i = 0; i < dev_priv->child_dev_num; i++) {
 810                 struct child_device_config *child = dev_priv->child_dev + i;
 811
 812                 /* If the device type is not LFP, continue.
 813                  * We have to check both the new identifiers as well as the
 814                  * old for compatibility with some BIOSes.
 815                  */
 816                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 817                     child->device_type != DEVICE_TYPE_LFP)
 818                         continue;
 819
 820                 if (child->i2c_pin)
 821                     *i2c_pin = child->i2c_pin;
 822
 823                 /* However, we cannot trust the BIOS writers to populate
 824                  * the VBT correctly.  Since LVDS requires additional
 825                  * information from AIM blocks, a non-zero addin offset is
 826                  * a good indicator that the LVDS is actually present.
 827                  */
 828                 if (child->addin_offset)
 829                         return true;
 830
 831                 /* But even then some BIOS writers perform some black magic
 832                  * and instantiate the device without reference to any
 833                  * additional data.  Trust that if the VBT was written into
 834                  * the OpRegion then they have validated the LVDS's existence.
 835                  */
 836                 if (dev_priv->opregion.vbt)
 837                         return true;
 838         }
 839
 840         return false;
 841 }
 842
 843 /**
 844  * intel_lvds_init - setup LVDS connectors on this device
 845  * @dev: drm device
 846  *
 847  * Create the connector, register the LVDS DDC bus, and try to figure out what
 848  * modes we can display on the LVDS panel (if present).
 849  */
 850 bool intel_lvds_init(struct drm_device *dev)
 851 {
 852         struct drm_i915_private *dev_priv = dev->dev_private;
 853         struct intel_lvds *intel_lvds;
 854         struct intel_encoder *intel_encoder;
 855         struct intel_connector *intel_connector;
 856         struct drm_connector *connector;
 857         struct drm_encoder *encoder;
 858         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 859         struct drm_crtc *crtc;
 860         u32 lvds;
 861         int pipe;
 862         u8 pin;
 863
 864         /* Skip init on machines we know falsely report LVDS */
 865         if (dmi_check_system(intel_no_lvds))
 866                 return false;
 867
 868         pin = GMBUS_PORT_PANEL;
 869         if (!lvds_is_present_in_vbt(dev, &pin)) {
 870                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 871                 return false;
 872         }
 873
 874         if (HAS_PCH_SPLIT(dev)) {
 875                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 876                         return false;
 877                 if (dev_priv->edp.support) {
 878                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 879                         return false;
 880                 }
 881         }
 882
 883         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
 884         if (!intel_lvds) {
 885                 return false;
 886         }
 887
 888         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 889         if (!intel_connector) {
 890                 kfree(intel_lvds);
 891                 return false;
 892         }
 893
 894         if (!HAS_PCH_SPLIT(dev)) {
 895                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
 896         }
 897
 898         intel_encoder = &intel_lvds->base;
 899         encoder = &intel_encoder->base;
 900         connector = &intel_connector->base;
 901         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 902                            DRM_MODE_CONNECTOR_LVDS);
 903
 904         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
 905                          DRM_MODE_ENCODER_LVDS);
 906
 907         intel_connector_attach_encoder(intel_connector, intel_encoder);
 908         intel_encoder->type = INTEL_OUTPUT_LVDS;
 909
 910         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
 911         intel_encoder->crtc_mask = (1 << 1);
 912         if (INTEL_INFO(dev)->gen >= 5)
 913                 intel_encoder->crtc_mask |= (1 << 0);
 914         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 915         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 916         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 917         connector->interlace_allowed = false;
 918         connector->doublescan_allowed = false;
 919
 920         /* create the scaling mode property */
 921         drm_mode_create_scaling_mode_property(dev);
 922         /*
 923          * the initial panel fitting mode will be FULL_SCREEN.
 924          */
 925
 926         drm_connector_attach_property(&intel_connector->base,
 927                                       dev->mode_config.scaling_mode_property,
 928                                       DRM_MODE_SCALE_ASPECT);
 929         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
 930         /*
 931          * LVDS discovery:
 932          * 1) check for EDID on DDC
 933          * 2) check for VBT data
 934          * 3) check to see if LVDS is already on
 935          *    if none of the above, no panel
 936          * 4) make sure lid is open
 937          *    if closed, act like it's not there for now
 938          */
 939
 940         /*
 941          * Attempt to get the fixed panel mode from DDC.  Assume that the
 942          * preferred mode is the right one.
 943          */
 944         intel_lvds->edid = drm_get_edid(connector,
 945                                         &dev_priv->gmbus[pin].adapter);
 946         if (intel_lvds->edid) {
 947                 if (drm_add_edid_modes(connector,
 948                                        intel_lvds->edid)) {
 949                         drm_mode_connector_update_edid_property(connector,
 950                                                                 intel_lvds->edid);
 951                 } else {
 952                         kfree(intel_lvds->edid);
 953                         intel_lvds->edid = NULL;
 954                 }
 955         }
 956         if (!intel_lvds->edid) {
 957                 /* Didn't get an EDID, so
 958                  * Set wide sync ranges so we get all modes
 959                  * handed to valid_mode for checking
 960                  */
 961                 connector->display_info.min_vfreq = 0;
 962                 connector->display_info.max_vfreq = 200;
 963                 connector->display_info.min_hfreq = 0;
 964                 connector->display_info.max_hfreq = 200;
 965         }
 966
 967         list_for_each_entry(scan, &connector->probed_modes, head) {
 968                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 969                         intel_lvds->fixed_mode =
 970                                 drm_mode_duplicate(dev, scan);
 971                         intel_find_lvds_downclock(dev,
 972                                                   intel_lvds->fixed_mode,
 973                                                   connector);
 974                         goto out;
 975                 }
 976         }
 977
 978         /* Failed to get EDID, what about VBT? */
 979         if (dev_priv->lfp_lvds_vbt_mode) {
 980                 intel_lvds->fixed_mode =
 981                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 982                 if (intel_lvds->fixed_mode) {
 983                         intel_lvds->fixed_mode->type |=
 984                                 DRM_MODE_TYPE_PREFERRED;
 985                         goto out;
 986                 }
 987         }
 988
 989         /*
 990          * If we didn't get EDID, try checking if the panel is already turned
 991          * on.  If so, assume that whatever is currently programmed is the
 992          * correct mode.
 993          */
 994
 995         /* Ironlake: FIXME if still fail, not try pipe mode now */
 996         if (HAS_PCH_SPLIT(dev))
 997                 goto failed;
 998
 999         lvds = I915_READ(LVDS);
1000         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1001         crtc = intel_get_crtc_for_pipe(dev, pipe);
1002
1003         if (crtc && (lvds & LVDS_PORT_EN)) {
1004                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1005                 if (intel_lvds->fixed_mode) {
1006                         intel_lvds->fixed_mode->type |=
1007                                 DRM_MODE_TYPE_PREFERRED;
1008                         goto out;
1009                 }
1010         }
1011
1012         /* If we still don't have a mode after all that, give up. */
1013         if (!intel_lvds->fixed_mode)
1014                 goto failed;
1015
1016 out:
1017         if (HAS_PCH_SPLIT(dev)) {
1018                 u32 pwm;
1019
1020                 pipe = (I915_READ(PCH_LVDS) & LVDS_PIPEB_SELECT) ? 1 : 0;
1021
1022                 /* make sure PWM is enabled and locked to the LVDS pipe */
1023                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1024                 if (pipe == 0 && (pwm & PWM_PIPE_B))
1025                         I915_WRITE(BLC_PWM_CPU_CTL2, pwm & ~PWM_ENABLE);
1026                 if (pipe)
1027                         pwm |= PWM_PIPE_B;
1028                 else
1029                         pwm &= ~PWM_PIPE_B;
1030                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm | PWM_ENABLE);
1031
1032                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1033                 pwm |= PWM_PCH_ENABLE;
1034                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1035         }
1036         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1037         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1038                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1039                 dev_priv->lid_notifier.notifier_call = NULL;
1040         }
1041         /* keep the LVDS connector */
1042         dev_priv->int_lvds_connector = connector;
1043         drm_sysfs_connector_add(connector);
1044         return true;
1045
1046 failed:
1047         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1048         drm_connector_cleanup(connector);
1049         drm_encoder_cleanup(encoder);
1050         kfree(intel_lvds);
1051         kfree(intel_connector);
1052         return false;
1053 }