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         int fitting_mode;
  47         u32 pfit_control;
  48         u32 pfit_pgm_ratios;
  49 };
  50
  51 static struct intel_lvds *enc_to_intel_lvds(struct drm_encoder *encoder)
  52 {
  53         return container_of(enc_to_intel_encoder(encoder), struct intel_lvds, base);
  54 }
  55
  56 /**
  57  * Sets the backlight level.
  58  *
  59  * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
  60  */
  61 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
  62 {
  63         struct drm_i915_private *dev_priv = dev->dev_private;
  64         u32 blc_pwm_ctl, reg;
  65
  66         if (HAS_PCH_SPLIT(dev))
  67                 reg = BLC_PWM_CPU_CTL;
  68         else
  69                 reg = BLC_PWM_CTL;
  70
  71         blc_pwm_ctl = I915_READ(reg) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  72         I915_WRITE(reg, (blc_pwm_ctl |
  73                                  (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
  74 }
  75
  76 /**
  77  * Returns the maximum level of the backlight duty cycle field.
  78  */
  79 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
  80 {
  81         struct drm_i915_private *dev_priv = dev->dev_private;
  82         u32 reg;
  83
  84         if (HAS_PCH_SPLIT(dev))
  85                 reg = BLC_PWM_PCH_CTL2;
  86         else
  87                 reg = BLC_PWM_CTL;
  88
  89         return ((I915_READ(reg) & BACKLIGHT_MODULATION_FREQ_MASK) >>
  90                 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  91 }
  92
  93 /**
  94  * Sets the power state for the panel.
  95  */
  96 static void intel_lvds_set_power(struct drm_device *dev, bool on)
  97 {
  98         struct drm_i915_private *dev_priv = dev->dev_private;
  99         u32 ctl_reg, status_reg, lvds_reg;
 100
 101         if (HAS_PCH_SPLIT(dev)) {
 102                 ctl_reg = PCH_PP_CONTROL;
 103                 status_reg = PCH_PP_STATUS;
 104                 lvds_reg = PCH_LVDS;
 105         } else {
 106                 ctl_reg = PP_CONTROL;
 107                 status_reg = PP_STATUS;
 108                 lvds_reg = LVDS;
 109         }
 110
 111         if (on) {
 112                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
 113                 POSTING_READ(lvds_reg);
 114
 115                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
 116                            POWER_TARGET_ON);
 117                 if (wait_for(I915_READ(status_reg) & PP_ON, 1000, 0))
 118                         DRM_ERROR("timed out waiting to enable LVDS pipe");
 119
 120                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
 121         } else {
 122                 intel_lvds_set_backlight(dev, 0);
 123
 124                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
 125                            ~POWER_TARGET_ON);
 126                 if (wait_for((I915_READ(status_reg) & PP_ON) == 0, 1000, 0))
 127                         DRM_ERROR("timed out waiting for LVDS pipe to turn off");
 128
 129                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 130                 POSTING_READ(lvds_reg);
 131         }
 132 }
 133
 134 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
 135 {
 136         struct drm_device *dev = encoder->dev;
 137
 138         if (mode == DRM_MODE_DPMS_ON)
 139                 intel_lvds_set_power(dev, true);
 140         else
 141                 intel_lvds_set_power(dev, false);
 142
 143         /* XXX: We never power down the LVDS pairs. */
 144 }
 145
 146 static int intel_lvds_mode_valid(struct drm_connector *connector,
 147                                  struct drm_display_mode *mode)
 148 {
 149         struct drm_device *dev = connector->dev;
 150         struct drm_i915_private *dev_priv = dev->dev_private;
 151         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
 152
 153         if (fixed_mode) {
 154                 if (mode->hdisplay > fixed_mode->hdisplay)
 155                         return MODE_PANEL;
 156                 if (mode->vdisplay > fixed_mode->vdisplay)
 157                         return MODE_PANEL;
 158         }
 159
 160         return MODE_OK;
 161 }
 162
 163 static void
 164 centre_horizontally(struct drm_display_mode *mode,
 165                     int width)
 166 {
 167         u32 border, sync_pos, blank_width, sync_width;
 168
 169         /* keep the hsync and hblank widths constant */
 170         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 171         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 172         sync_pos = (blank_width - sync_width + 1) / 2;
 173
 174         border = (mode->hdisplay - width + 1) / 2;
 175         border += border & 1; /* make the border even */
 176
 177         mode->crtc_hdisplay = width;
 178         mode->crtc_hblank_start = width + border;
 179         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 180
 181         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 182         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 183 }
 184
 185 static void
 186 centre_vertically(struct drm_display_mode *mode,
 187                   int height)
 188 {
 189         u32 border, sync_pos, blank_width, sync_width;
 190
 191         /* keep the vsync and vblank widths constant */
 192         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 193         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 194         sync_pos = (blank_width - sync_width + 1) / 2;
 195
 196         border = (mode->vdisplay - height + 1) / 2;
 197
 198         mode->crtc_vdisplay = height;
 199         mode->crtc_vblank_start = height + border;
 200         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 201
 202         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 203         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 204 }
 205
 206 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 207 {
 208         /*
 209          * Floating point operation is not supported. So the FACTOR
 210          * is defined, which can avoid the floating point computation
 211          * when calculating the panel ratio.
 212          */
 213 #define ACCURACY 12
 214 #define FACTOR (1 << ACCURACY)
 215         u32 ratio = source * FACTOR / target;
 216         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 217 }
 218
 219 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 220                                   struct drm_display_mode *mode,
 221                                   struct drm_display_mode *adjusted_mode)
 222 {
 223         struct drm_device *dev = encoder->dev;
 224         struct drm_i915_private *dev_priv = dev->dev_private;
 225         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 226         struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
 227         struct drm_encoder *tmp_encoder;
 228         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 229
 230         /* Should never happen!! */
 231         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
 232                 DRM_ERROR("Can't support LVDS on pipe A\n");
 233                 return false;
 234         }
 235
 236         /* Should never happen!! */
 237         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 238                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
 239                         DRM_ERROR("Can't enable LVDS and another "
 240                                "encoder on the same pipe\n");
 241                         return false;
 242                 }
 243         }
 244         /* If we don't have a panel mode, there is nothing we can do */
 245         if (dev_priv->panel_fixed_mode == NULL)
 246                 return true;
 247
 248         /*
 249          * We have timings from the BIOS for the panel, put them in
 250          * to the adjusted mode.  The CRTC will be set up for this mode,
 251          * with the panel scaling set up to source from the H/VDisplay
 252          * of the original mode.
 253          */
 254         intel_fixed_panel_mode(dev_priv->panel_fixed_mode, adjusted_mode);
 255
 256         if (HAS_PCH_SPLIT(dev)) {
 257                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
 258                                         mode, adjusted_mode);
 259                 return true;
 260         }
 261
 262         /* Make sure pre-965s set dither correctly */
 263         if (!IS_I965G(dev)) {
 264                 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
 265                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 266         }
 267
 268         /* Native modes don't need fitting */
 269         if (adjusted_mode->hdisplay == mode->hdisplay &&
 270             adjusted_mode->vdisplay == mode->vdisplay)
 271                 goto out;
 272
 273         /* 965+ wants fuzzy fitting */
 274         if (IS_I965G(dev))
 275                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 276                                  PFIT_FILTER_FUZZY);
 277
 278         /*
 279          * Enable automatic panel scaling for non-native modes so that they fill
 280          * the screen.  Should be enabled before the pipe is enabled, according
 281          * to register description and PRM.
 282          * Change the value here to see the borders for debugging
 283          */
 284         I915_WRITE(BCLRPAT_A, 0);
 285         I915_WRITE(BCLRPAT_B, 0);
 286
 287         switch (intel_lvds->fitting_mode) {
 288         case DRM_MODE_SCALE_CENTER:
 289                 /*
 290                  * For centered modes, we have to calculate border widths &
 291                  * heights and modify the values programmed into the CRTC.
 292                  */
 293                 centre_horizontally(adjusted_mode, mode->hdisplay);
 294                 centre_vertically(adjusted_mode, mode->vdisplay);
 295                 border = LVDS_BORDER_ENABLE;
 296                 break;
 297
 298         case DRM_MODE_SCALE_ASPECT:
 299                 /* Scale but preserve the aspect ratio */
 300                 if (IS_I965G(dev)) {
 301                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 302                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 303
 304                         pfit_control |= PFIT_ENABLE;
 305                         /* 965+ is easy, it does everything in hw */
 306                         if (scaled_width > scaled_height)
 307                                 pfit_control |= PFIT_SCALING_PILLAR;
 308                         else if (scaled_width < scaled_height)
 309                                 pfit_control |= PFIT_SCALING_LETTER;
 310                         else
 311                                 pfit_control |= PFIT_SCALING_AUTO;
 312                 } else {
 313                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
 314                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
 315                         /*
 316                          * For earlier chips we have to calculate the scaling
 317                          * ratio by hand and program it into the
 318                          * PFIT_PGM_RATIO register
 319                          */
 320                         if (scaled_width > scaled_height) { /* pillar */
 321                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
 322
 323                                 border = LVDS_BORDER_ENABLE;
 324                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
 325                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
 326                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 327                                                             bits << PFIT_VERT_SCALE_SHIFT);
 328                                         pfit_control |= (PFIT_ENABLE |
 329                                                          VERT_INTERP_BILINEAR |
 330                                                          HORIZ_INTERP_BILINEAR);
 331                                 }
 332                         } else if (scaled_width < scaled_height) { /* letter */
 333                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
 334
 335                                 border = LVDS_BORDER_ENABLE;
 336                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
 337                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
 338                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 339                                                             bits << PFIT_VERT_SCALE_SHIFT);
 340                                         pfit_control |= (PFIT_ENABLE |
 341                                                          VERT_INTERP_BILINEAR |
 342                                                          HORIZ_INTERP_BILINEAR);
 343                                 }
 344                         } else
 345                                 /* Aspects match, Let hw scale both directions */
 346                                 pfit_control |= (PFIT_ENABLE |
 347                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 348                                                  VERT_INTERP_BILINEAR |
 349                                                  HORIZ_INTERP_BILINEAR);
 350                 }
 351                 break;
 352
 353         case DRM_MODE_SCALE_FULLSCREEN:
 354                 /*
 355                  * Full scaling, even if it changes the aspect ratio.
 356                  * Fortunately this is all done for us in hw.
 357                  */
 358                 pfit_control |= PFIT_ENABLE;
 359                 if (IS_I965G(dev))
 360                         pfit_control |= PFIT_SCALING_AUTO;
 361                 else
 362                         pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 363                                          VERT_INTERP_BILINEAR |
 364                                          HORIZ_INTERP_BILINEAR);
 365                 break;
 366
 367         default:
 368                 break;
 369         }
 370
 371 out:
 372         intel_lvds->pfit_control = pfit_control;
 373         intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
 374         dev_priv->lvds_border_bits = border;
 375
 376         /*
 377          * XXX: It would be nice to support lower refresh rates on the
 378          * panels to reduce power consumption, and perhaps match the
 379          * user's requested refresh rate.
 380          */
 381
 382         return true;
 383 }
 384
 385 static void intel_lvds_prepare(struct drm_encoder *encoder)
 386 {
 387         struct drm_device *dev = encoder->dev;
 388         struct drm_i915_private *dev_priv = dev->dev_private;
 389         u32 reg;
 390
 391         if (HAS_PCH_SPLIT(dev))
 392                 reg = BLC_PWM_CPU_CTL;
 393         else
 394                 reg = BLC_PWM_CTL;
 395
 396         dev_priv->saveBLC_PWM_CTL = I915_READ(reg);
 397         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 398                                        BACKLIGHT_DUTY_CYCLE_MASK);
 399
 400         intel_lvds_set_power(dev, false);
 401 }
 402
 403 static void intel_lvds_commit( struct drm_encoder *encoder)
 404 {
 405         struct drm_device *dev = encoder->dev;
 406         struct drm_i915_private *dev_priv = dev->dev_private;
 407
 408         if (dev_priv->backlight_duty_cycle == 0)
 409                 dev_priv->backlight_duty_cycle =
 410                         intel_lvds_get_max_backlight(dev);
 411
 412         intel_lvds_set_power(dev, true);
 413 }
 414
 415 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 416                                 struct drm_display_mode *mode,
 417                                 struct drm_display_mode *adjusted_mode)
 418 {
 419         struct drm_device *dev = encoder->dev;
 420         struct drm_i915_private *dev_priv = dev->dev_private;
 421         struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
 422
 423         /*
 424          * The LVDS pin pair will already have been turned on in the
 425          * intel_crtc_mode_set since it has a large impact on the DPLL
 426          * settings.
 427          */
 428
 429         if (HAS_PCH_SPLIT(dev))
 430                 return;
 431
 432         /*
 433          * Enable automatic panel scaling so that non-native modes fill the
 434          * screen.  Should be enabled before the pipe is enabled, according to
 435          * register description and PRM.
 436          */
 437         I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
 438         I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
 439 }
 440
 441 /**
 442  * Detect the LVDS connection.
 443  *
 444  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 445  * connected and closed means disconnected.  We also send hotplug events as
 446  * needed, using lid status notification from the input layer.
 447  */
 448 static enum drm_connector_status
 449 intel_lvds_detect(struct drm_connector *connector, bool force)
 450 {
 451         struct drm_device *dev = connector->dev;
 452         enum drm_connector_status status = connector_status_connected;
 453
 454         /* ACPI lid methods were generally unreliable in this generation, so
 455          * don't even bother.
 456          */
 457         if (IS_GEN2(dev) || IS_GEN3(dev))
 458                 return connector_status_connected;
 459
 460         return status;
 461 }
 462
 463 /**
 464  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 465  */
 466 static int intel_lvds_get_modes(struct drm_connector *connector)
 467 {
 468         struct drm_device *dev = connector->dev;
 469         struct drm_encoder *encoder = intel_attached_encoder(connector);
 470         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 471         struct drm_i915_private *dev_priv = dev->dev_private;
 472         int ret = 0;
 473
 474         if (dev_priv->lvds_edid_good) {
 475                 ret = intel_ddc_get_modes(connector, intel_encoder->ddc_bus);
 476
 477                 if (ret)
 478                         return ret;
 479         }
 480
 481         /* Didn't get an EDID, so
 482          * Set wide sync ranges so we get all modes
 483          * handed to valid_mode for checking
 484          */
 485         connector->display_info.min_vfreq = 0;
 486         connector->display_info.max_vfreq = 200;
 487         connector->display_info.min_hfreq = 0;
 488         connector->display_info.max_hfreq = 200;
 489
 490         if (dev_priv->panel_fixed_mode != NULL) {
 491                 struct drm_display_mode *mode;
 492
 493                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 494                 drm_mode_probed_add(connector, mode);
 495
 496                 return 1;
 497         }
 498
 499         return 0;
 500 }
 501
 502 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
 503 {
 504         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
 505         return 1;
 506 }
 507
 508 /* The GPU hangs up on these systems if modeset is performed on LID open */
 509 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
 510         {
 511                 .callback = intel_no_modeset_on_lid_dmi_callback,
 512                 .ident = "Toshiba Tecra A11",
 513                 .matches = {
 514                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 515                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
 516                 },
 517         },
 518
 519         { }     /* terminating entry */
 520 };
 521
 522 /*
 523  * Lid events. Note the use of 'modeset_on_lid':
 524  *  - we set it on lid close, and reset it on open
 525  *  - we use it as a "only once" bit (ie we ignore
 526  *    duplicate events where it was already properly
 527  *    set/reset)
 528  *  - the suspend/resume paths will also set it to
 529  *    zero, since they restore the mode ("lid open").
 530  */
 531 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 532                             void *unused)
 533 {
 534         struct drm_i915_private *dev_priv =
 535                 container_of(nb, struct drm_i915_private, lid_notifier);
 536         struct drm_device *dev = dev_priv->dev;
 537         struct drm_connector *connector = dev_priv->int_lvds_connector;
 538
 539         /*
 540          * check and update the status of LVDS connector after receiving
 541          * the LID nofication event.
 542          */
 543         if (connector)
 544                 connector->status = connector->funcs->detect(connector,
 545                                                              false);
 546
 547         /* Don't force modeset on machines where it causes a GPU lockup */
 548         if (dmi_check_system(intel_no_modeset_on_lid))
 549                 return NOTIFY_OK;
 550         if (!acpi_lid_open()) {
 551                 dev_priv->modeset_on_lid = 1;
 552                 return NOTIFY_OK;
 553         }
 554
 555         if (!dev_priv->modeset_on_lid)
 556                 return NOTIFY_OK;
 557
 558         dev_priv->modeset_on_lid = 0;
 559
 560         mutex_lock(&dev->mode_config.mutex);
 561         drm_helper_resume_force_mode(dev);
 562         mutex_unlock(&dev->mode_config.mutex);
 563
 564         return NOTIFY_OK;
 565 }
 566
 567 /**
 568  * intel_lvds_destroy - unregister and free LVDS structures
 569  * @connector: connector to free
 570  *
 571  * Unregister the DDC bus for this connector then free the driver private
 572  * structure.
 573  */
 574 static void intel_lvds_destroy(struct drm_connector *connector)
 575 {
 576         struct drm_device *dev = connector->dev;
 577         struct drm_i915_private *dev_priv = dev->dev_private;
 578
 579         if (dev_priv->lid_notifier.notifier_call)
 580                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 581         drm_sysfs_connector_remove(connector);
 582         drm_connector_cleanup(connector);
 583         kfree(connector);
 584 }
 585
 586 static int intel_lvds_set_property(struct drm_connector *connector,
 587                                    struct drm_property *property,
 588                                    uint64_t value)
 589 {
 590         struct drm_device *dev = connector->dev;
 591
 592         if (property == dev->mode_config.scaling_mode_property &&
 593                                 connector->encoder) {
 594                 struct drm_crtc *crtc = connector->encoder->crtc;
 595                 struct drm_encoder *encoder = connector->encoder;
 596                 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
 597
 598                 if (value == DRM_MODE_SCALE_NONE) {
 599                         DRM_DEBUG_KMS("no scaling not supported\n");
 600                         return 0;
 601                 }
 602                 if (intel_lvds->fitting_mode == value) {
 603                         /* the LVDS scaling property is not changed */
 604                         return 0;
 605                 }
 606                 intel_lvds->fitting_mode = value;
 607                 if (crtc && crtc->enabled) {
 608                         /*
 609                          * If the CRTC is enabled, the display will be changed
 610                          * according to the new panel fitting mode.
 611                          */
 612                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
 613                                 crtc->x, crtc->y, crtc->fb);
 614                 }
 615         }
 616
 617         return 0;
 618 }
 619
 620 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 621         .dpms = intel_lvds_dpms,
 622         .mode_fixup = intel_lvds_mode_fixup,
 623         .prepare = intel_lvds_prepare,
 624         .mode_set = intel_lvds_mode_set,
 625         .commit = intel_lvds_commit,
 626 };
 627
 628 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 629         .get_modes = intel_lvds_get_modes,
 630         .mode_valid = intel_lvds_mode_valid,
 631         .best_encoder = intel_attached_encoder,
 632 };
 633
 634 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 635         .dpms = drm_helper_connector_dpms,
 636         .detect = intel_lvds_detect,
 637         .fill_modes = drm_helper_probe_single_connector_modes,
 638         .set_property = intel_lvds_set_property,
 639         .destroy = intel_lvds_destroy,
 640 };
 641
 642 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 643         .destroy = intel_encoder_destroy,
 644 };
 645
 646 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 647 {
 648         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
 649         return 1;
 650 }
 651
 652 /* These systems claim to have LVDS, but really don't */
 653 static const struct dmi_system_id intel_no_lvds[] = {
 654         {
 655                 .callback = intel_no_lvds_dmi_callback,
 656                 .ident = "Apple Mac Mini (Core series)",
 657                 .matches = {
 658                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 659                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 660                 },
 661         },
 662         {
 663                 .callback = intel_no_lvds_dmi_callback,
 664                 .ident = "Apple Mac Mini (Core 2 series)",
 665                 .matches = {
 666                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 667                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 668                 },
 669         },
 670         {
 671                 .callback = intel_no_lvds_dmi_callback,
 672                 .ident = "MSI IM-945GSE-A",
 673                 .matches = {
 674                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 675                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 676                 },
 677         },
 678         {
 679                 .callback = intel_no_lvds_dmi_callback,
 680                 .ident = "Dell Studio Hybrid",
 681                 .matches = {
 682                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 683                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 684                 },
 685         },
 686         {
 687                 .callback = intel_no_lvds_dmi_callback,
 688                 .ident = "AOpen Mini PC",
 689                 .matches = {
 690                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 691                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 692                 },
 693         },
 694         {
 695                 .callback = intel_no_lvds_dmi_callback,
 696                 .ident = "AOpen Mini PC MP915",
 697                 .matches = {
 698                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 699                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 700                 },
 701         },
 702         {
 703                 .callback = intel_no_lvds_dmi_callback,
 704                 .ident = "Aopen i945GTt-VFA",
 705                 .matches = {
 706                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 707                 },
 708         },
 709         {
 710                 .callback = intel_no_lvds_dmi_callback,
 711                 .ident = "Clientron U800",
 712                 .matches = {
 713                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
 714                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
 715                 },
 716         },
 717
 718         { }     /* terminating entry */
 719 };
 720
 721 /**
 722  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 723  * @dev: drm device
 724  * @connector: LVDS connector
 725  *
 726  * Find the reduced downclock for LVDS in EDID.
 727  */
 728 static void intel_find_lvds_downclock(struct drm_device *dev,
 729                                 struct drm_connector *connector)
 730 {
 731         struct drm_i915_private *dev_priv = dev->dev_private;
 732         struct drm_display_mode *scan, *panel_fixed_mode;
 733         int temp_downclock;
 734
 735         panel_fixed_mode = dev_priv->panel_fixed_mode;
 736         temp_downclock = panel_fixed_mode->clock;
 737
 738         mutex_lock(&dev->mode_config.mutex);
 739         list_for_each_entry(scan, &connector->probed_modes, head) {
 740                 /*
 741                  * If one mode has the same resolution with the fixed_panel
 742                  * mode while they have the different refresh rate, it means
 743                  * that the reduced downclock is found for the LVDS. In such
 744                  * case we can set the different FPx0/1 to dynamically select
 745                  * between low and high frequency.
 746                  */
 747                 if (scan->hdisplay == panel_fixed_mode->hdisplay &&
 748                         scan->hsync_start == panel_fixed_mode->hsync_start &&
 749                         scan->hsync_end == panel_fixed_mode->hsync_end &&
 750                         scan->htotal == panel_fixed_mode->htotal &&
 751                         scan->vdisplay == panel_fixed_mode->vdisplay &&
 752                         scan->vsync_start == panel_fixed_mode->vsync_start &&
 753                         scan->vsync_end == panel_fixed_mode->vsync_end &&
 754                         scan->vtotal == panel_fixed_mode->vtotal) {
 755                         if (scan->clock < temp_downclock) {
 756                                 /*
 757                                  * The downclock is already found. But we
 758                                  * expect to find the lower downclock.
 759                                  */
 760                                 temp_downclock = scan->clock;
 761                         }
 762                 }
 763         }
 764         mutex_unlock(&dev->mode_config.mutex);
 765         if (temp_downclock < panel_fixed_mode->clock &&
 766             i915_lvds_downclock) {
 767                 /* We found the downclock for LVDS. */
 768                 dev_priv->lvds_downclock_avail = 1;
 769                 dev_priv->lvds_downclock = temp_downclock;
 770                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 771                                 "Normal clock %dKhz, downclock %dKhz\n",
 772                                 panel_fixed_mode->clock, temp_downclock);
 773         }
 774         return;
 775 }
 776
 777 /*
 778  * Enumerate the child dev array parsed from VBT to check whether
 779  * the LVDS is present.
 780  * If it is present, return 1.
 781  * If it is not present, return false.
 782  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 783  * Note: The addin_offset should also be checked for LVDS panel.
 784  * Only when it is non-zero, it is assumed that it is present.
 785  */
 786 static int lvds_is_present_in_vbt(struct drm_device *dev)
 787 {
 788         struct drm_i915_private *dev_priv = dev->dev_private;
 789         struct child_device_config *p_child;
 790         int i, ret;
 791
 792         if (!dev_priv->child_dev_num)
 793                 return 1;
 794
 795         ret = 0;
 796         for (i = 0; i < dev_priv->child_dev_num; i++) {
 797                 p_child = dev_priv->child_dev + i;
 798                 /*
 799                  * If the device type is not LFP, continue.
 800                  * If the device type is 0x22, it is also regarded as LFP.
 801                  */
 802                 if (p_child->device_type != DEVICE_TYPE_INT_LFP &&
 803                         p_child->device_type != DEVICE_TYPE_LFP)
 804                         continue;
 805
 806                 /* The addin_offset should be checked. Only when it is
 807                  * non-zero, it is regarded as present.
 808                  */
 809                 if (p_child->addin_offset) {
 810                         ret = 1;
 811                         break;
 812                 }
 813         }
 814         return ret;
 815 }
 816
 817 /**
 818  * intel_lvds_init - setup LVDS connectors on this device
 819  * @dev: drm device
 820  *
 821  * Create the connector, register the LVDS DDC bus, and try to figure out what
 822  * modes we can display on the LVDS panel (if present).
 823  */
 824 void intel_lvds_init(struct drm_device *dev)
 825 {
 826         struct drm_i915_private *dev_priv = dev->dev_private;
 827         struct intel_lvds *intel_lvds;
 828         struct intel_encoder *intel_encoder;
 829         struct intel_connector *intel_connector;
 830         struct drm_connector *connector;
 831         struct drm_encoder *encoder;
 832         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 833         struct drm_crtc *crtc;
 834         u32 lvds;
 835         int pipe, gpio = GPIOC;
 836
 837         /* Skip init on machines we know falsely report LVDS */
 838         if (dmi_check_system(intel_no_lvds))
 839                 return;
 840
 841         if (!lvds_is_present_in_vbt(dev)) {
 842                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 843                 return;
 844         }
 845
 846         if (HAS_PCH_SPLIT(dev)) {
 847                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 848                         return;
 849                 if (dev_priv->edp_support) {
 850                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
 851                         return;
 852                 }
 853                 gpio = PCH_GPIOC;
 854         }
 855
 856         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
 857         if (!intel_lvds) {
 858                 return;
 859         }
 860
 861         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 862         if (!intel_connector) {
 863                 kfree(intel_lvds);
 864                 return;
 865         }
 866
 867         intel_encoder = &intel_lvds->base;
 868         encoder = &intel_encoder->enc;
 869         connector = &intel_connector->base;
 870         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
 871                            DRM_MODE_CONNECTOR_LVDS);
 872
 873         drm_encoder_init(dev, &intel_encoder->enc, &intel_lvds_enc_funcs,
 874                          DRM_MODE_ENCODER_LVDS);
 875
 876         drm_mode_connector_attach_encoder(&intel_connector->base, &intel_encoder->enc);
 877         intel_encoder->type = INTEL_OUTPUT_LVDS;
 878
 879         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
 880         intel_encoder->crtc_mask = (1 << 1);
 881         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 882         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 883         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 884         connector->interlace_allowed = false;
 885         connector->doublescan_allowed = false;
 886
 887         /* create the scaling mode property */
 888         drm_mode_create_scaling_mode_property(dev);
 889         /*
 890          * the initial panel fitting mode will be FULL_SCREEN.
 891          */
 892
 893         drm_connector_attach_property(&intel_connector->base,
 894                                       dev->mode_config.scaling_mode_property,
 895                                       DRM_MODE_SCALE_ASPECT);
 896         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
 897         /*
 898          * LVDS discovery:
 899          * 1) check for EDID on DDC
 900          * 2) check for VBT data
 901          * 3) check to see if LVDS is already on
 902          *    if none of the above, no panel
 903          * 4) make sure lid is open
 904          *    if closed, act like it's not there for now
 905          */
 906
 907         /* Set up the DDC bus. */
 908         intel_encoder->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
 909         if (!intel_encoder->ddc_bus) {
 910                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 911                            "failed.\n");
 912                 goto failed;
 913         }
 914
 915         /*
 916          * Attempt to get the fixed panel mode from DDC.  Assume that the
 917          * preferred mode is the right one.
 918          */
 919         dev_priv->lvds_edid_good = true;
 920
 921         if (!intel_ddc_get_modes(connector, intel_encoder->ddc_bus))
 922                 dev_priv->lvds_edid_good = false;
 923
 924         list_for_each_entry(scan, &connector->probed_modes, head) {
 925                 mutex_lock(&dev->mode_config.mutex);
 926                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 927                         dev_priv->panel_fixed_mode =
 928                                 drm_mode_duplicate(dev, scan);
 929                         mutex_unlock(&dev->mode_config.mutex);
 930                         intel_find_lvds_downclock(dev, connector);
 931                         goto out;
 932                 }
 933                 mutex_unlock(&dev->mode_config.mutex);
 934         }
 935
 936         /* Failed to get EDID, what about VBT? */
 937         if (dev_priv->lfp_lvds_vbt_mode) {
 938                 mutex_lock(&dev->mode_config.mutex);
 939                 dev_priv->panel_fixed_mode =
 940                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 941                 mutex_unlock(&dev->mode_config.mutex);
 942                 if (dev_priv->panel_fixed_mode) {
 943                         dev_priv->panel_fixed_mode->type |=
 944                                 DRM_MODE_TYPE_PREFERRED;
 945                         goto out;
 946                 }
 947         }
 948
 949         /*
 950          * If we didn't get EDID, try checking if the panel is already turned
 951          * on.  If so, assume that whatever is currently programmed is the
 952          * correct mode.
 953          */
 954
 955         /* Ironlake: FIXME if still fail, not try pipe mode now */
 956         if (HAS_PCH_SPLIT(dev))
 957                 goto failed;
 958
 959         lvds = I915_READ(LVDS);
 960         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 961         crtc = intel_get_crtc_from_pipe(dev, pipe);
 962
 963         if (crtc && (lvds & LVDS_PORT_EN)) {
 964                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
 965                 if (dev_priv->panel_fixed_mode) {
 966                         dev_priv->panel_fixed_mode->type |=
 967                                 DRM_MODE_TYPE_PREFERRED;
 968                         goto out;
 969                 }
 970         }
 971
 972         /* If we still don't have a mode after all that, give up. */
 973         if (!dev_priv->panel_fixed_mode)
 974                 goto failed;
 975
 976 out:
 977         if (HAS_PCH_SPLIT(dev)) {
 978                 u32 pwm;
 979                 /* make sure PWM is enabled */
 980                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
 981                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
 982                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
 983
 984                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
 985                 pwm |= PWM_PCH_ENABLE;
 986                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
 987         }
 988         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
 989         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
 990                 DRM_DEBUG_KMS("lid notifier registration failed\n");
 991                 dev_priv->lid_notifier.notifier_call = NULL;
 992         }
 993         /* keep the LVDS connector */
 994         dev_priv->int_lvds_connector = connector;
 995         drm_sysfs_connector_add(connector);
 996         return;
 997
 998 failed:
 999         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1000         if (intel_encoder->ddc_bus)
1001                 intel_i2c_destroy(intel_encoder->ddc_bus);
1002         drm_connector_cleanup(connector);
1003         drm_encoder_cleanup(encoder);
1004         kfree(intel_lvds);
1005         kfree(intel_connector);
1006 }