drivers/gpu/drm/gma500/cdv_intel_lvds.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright © 2006-2011 Intel Corporation
   4  *
   5  * Authors:
   6  *      Eric Anholt <eric@anholt.net>
   7  *      Dave Airlie <airlied@linux.ie>
   8  *      Jesse Barnes <jesse.barnes@intel.com>
   9  */
  10
  11 #include <linux/dmi.h>
  12 #include <linux/i2c.h>
  13 #include <linux/pm_runtime.h>
  14
  15 #include <drm/drm_simple_kms_helper.h>
  16
  17 #include "cdv_device.h"
  18 #include "intel_bios.h"
  19 #include "power.h"
  20 #include "psb_drv.h"
  21 #include "psb_intel_drv.h"
  22 #include "psb_intel_reg.h"
  23
  24 /**
  25  * LVDS I2C backlight control macros
  26  */
  27 #define BRIGHTNESS_MAX_LEVEL 100
  28 #define BRIGHTNESS_MASK 0xFF
  29 #define BLC_I2C_TYPE    0x01
  30 #define BLC_PWM_TYPT    0x02
  31
  32 #define BLC_POLARITY_NORMAL 0
  33 #define BLC_POLARITY_INVERSE 1
  34
  35 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
  36 #define PSB_BLC_MIN_PWM_REG_FREQ        (0x2)
  37 #define PSB_BLC_PWM_PRECISION_FACTOR    (10)
  38 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  39 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  40
  41 struct cdv_intel_lvds_priv {
  42         /**
  43          * Saved LVDO output states
  44          */
  45         uint32_t savePP_ON;
  46         uint32_t savePP_OFF;
  47         uint32_t saveLVDS;
  48         uint32_t savePP_CONTROL;
  49         uint32_t savePP_CYCLE;
  50         uint32_t savePFIT_CONTROL;
  51         uint32_t savePFIT_PGM_RATIOS;
  52         uint32_t saveBLC_PWM_CTL;
  53 };
  54
  55 /*
  56  * Returns the maximum level of the backlight duty cycle field.
  57  */
  58 static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev)
  59 {
  60         struct drm_psb_private *dev_priv = dev->dev_private;
  61         u32 retval;
  62
  63         if (gma_power_begin(dev, false)) {
  64                 retval = ((REG_READ(BLC_PWM_CTL) &
  65                           BACKLIGHT_MODULATION_FREQ_MASK) >>
  66                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  67
  68                 gma_power_end(dev);
  69         } else
  70                 retval = ((dev_priv->regs.saveBLC_PWM_CTL &
  71                           BACKLIGHT_MODULATION_FREQ_MASK) >>
  72                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  73
  74         return retval;
  75 }
  76
  77 /**
  78  * Sets the backlight level.
  79  *
  80  * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight().
  81  */
  82 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level)
  83 {
  84         struct drm_psb_private *dev_priv = dev->dev_private;
  85         u32 blc_pwm_ctl;
  86
  87         if (gma_power_begin(dev, false)) {
  88                 blc_pwm_ctl =
  89                         REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  90                 REG_WRITE(BLC_PWM_CTL,
  91                                 (blc_pwm_ctl |
  92                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
  93                 gma_power_end(dev);
  94         } else {
  95                 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
  96                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
  97                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
  98                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
  99         }
 100 }
 101
 102 /**
 103  * Sets the power state for the panel.
 104  */
 105 static void cdv_intel_lvds_set_power(struct drm_device *dev,
 106                                      struct drm_encoder *encoder, bool on)
 107 {
 108         struct drm_psb_private *dev_priv = dev->dev_private;
 109         u32 pp_status;
 110
 111         if (!gma_power_begin(dev, true))
 112                 return;
 113
 114         if (on) {
 115                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 116                           POWER_TARGET_ON);
 117                 do {
 118                         pp_status = REG_READ(PP_STATUS);
 119                 } while ((pp_status & PP_ON) == 0);
 120
 121                 cdv_intel_lvds_set_backlight(dev,
 122                                 dev_priv->mode_dev.backlight_duty_cycle);
 123         } else {
 124                 cdv_intel_lvds_set_backlight(dev, 0);
 125
 126                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 127                           ~POWER_TARGET_ON);
 128                 do {
 129                         pp_status = REG_READ(PP_STATUS);
 130                 } while (pp_status & PP_ON);
 131         }
 132         gma_power_end(dev);
 133 }
 134
 135 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 136 {
 137         struct drm_device *dev = encoder->dev;
 138         if (mode == DRM_MODE_DPMS_ON)
 139                 cdv_intel_lvds_set_power(dev, encoder, true);
 140         else
 141                 cdv_intel_lvds_set_power(dev, encoder, false);
 142         /* XXX: We never power down the LVDS pairs. */
 143 }
 144
 145 static void cdv_intel_lvds_save(struct drm_connector *connector)
 146 {
 147 }
 148
 149 static void cdv_intel_lvds_restore(struct drm_connector *connector)
 150 {
 151 }
 152
 153 static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector,
 154                               struct drm_display_mode *mode)
 155 {
 156         struct drm_device *dev = connector->dev;
 157         struct drm_psb_private *dev_priv = dev->dev_private;
 158         struct drm_display_mode *fixed_mode =
 159                                         dev_priv->mode_dev.panel_fixed_mode;
 160
 161         /* just in case */
 162         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 163                 return MODE_NO_DBLESCAN;
 164
 165         /* just in case */
 166         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 167                 return MODE_NO_INTERLACE;
 168
 169         if (fixed_mode) {
 170                 if (mode->hdisplay > fixed_mode->hdisplay)
 171                         return MODE_PANEL;
 172                 if (mode->vdisplay > fixed_mode->vdisplay)
 173                         return MODE_PANEL;
 174         }
 175         return MODE_OK;
 176 }
 177
 178 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 179                                   const struct drm_display_mode *mode,
 180                                   struct drm_display_mode *adjusted_mode)
 181 {
 182         struct drm_device *dev = encoder->dev;
 183         struct drm_psb_private *dev_priv = dev->dev_private;
 184         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 185         struct drm_encoder *tmp_encoder;
 186         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 187
 188         /* Should never happen!! */
 189         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 190                             head) {
 191                 if (tmp_encoder != encoder
 192                     && tmp_encoder->crtc == encoder->crtc) {
 193                         pr_err("Can't enable LVDS and another encoder on the same pipe\n");
 194                         return false;
 195                 }
 196         }
 197
 198         /*
 199          * If we have timings from the BIOS for the panel, put them in
 200          * to the adjusted mode.  The CRTC will be set up for this mode,
 201          * with the panel scaling set up to source from the H/VDisplay
 202          * of the original mode.
 203          */
 204         if (panel_fixed_mode != NULL) {
 205                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 206                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 207                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 208                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 209                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 210                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 211                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 212                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 213                 adjusted_mode->clock = panel_fixed_mode->clock;
 214                 drm_mode_set_crtcinfo(adjusted_mode,
 215                                       CRTC_INTERLACE_HALVE_V);
 216         }
 217
 218         /*
 219          * XXX: It would be nice to support lower refresh rates on the
 220          * panels to reduce power consumption, and perhaps match the
 221          * user's requested refresh rate.
 222          */
 223
 224         return true;
 225 }
 226
 227 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder)
 228 {
 229         struct drm_device *dev = encoder->dev;
 230         struct drm_psb_private *dev_priv = dev->dev_private;
 231         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 232
 233         if (!gma_power_begin(dev, true))
 234                 return;
 235
 236         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 237         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 238                                           BACKLIGHT_DUTY_CYCLE_MASK);
 239
 240         cdv_intel_lvds_set_power(dev, encoder, false);
 241
 242         gma_power_end(dev);
 243 }
 244
 245 static void cdv_intel_lvds_commit(struct drm_encoder *encoder)
 246 {
 247         struct drm_device *dev = encoder->dev;
 248         struct drm_psb_private *dev_priv = dev->dev_private;
 249         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 250
 251         if (mode_dev->backlight_duty_cycle == 0)
 252                 mode_dev->backlight_duty_cycle =
 253                     cdv_intel_lvds_get_max_backlight(dev);
 254
 255         cdv_intel_lvds_set_power(dev, encoder, true);
 256 }
 257
 258 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder,
 259                                 struct drm_display_mode *mode,
 260                                 struct drm_display_mode *adjusted_mode)
 261 {
 262         struct drm_device *dev = encoder->dev;
 263         struct drm_psb_private *dev_priv = dev->dev_private;
 264         struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
 265         u32 pfit_control;
 266
 267         /*
 268          * The LVDS pin pair will already have been turned on in the
 269          * cdv_intel_crtc_mode_set since it has a large impact on the DPLL
 270          * settings.
 271          */
 272
 273         /*
 274          * Enable automatic panel scaling so that non-native modes fill the
 275          * screen.  Should be enabled before the pipe is enabled, according to
 276          * register description and PRM.
 277          */
 278         if (mode->hdisplay != adjusted_mode->hdisplay ||
 279             mode->vdisplay != adjusted_mode->vdisplay)
 280                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 281                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 282                                 HORIZ_INTERP_BILINEAR);
 283         else
 284                 pfit_control = 0;
 285
 286         pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT;
 287
 288         if (dev_priv->lvds_dither)
 289                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 290
 291         REG_WRITE(PFIT_CONTROL, pfit_control);
 292 }
 293
 294 /**
 295  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 296  */
 297 static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
 298 {
 299         struct drm_device *dev = connector->dev;
 300         struct drm_psb_private *dev_priv = dev->dev_private;
 301         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 302         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 303         int ret;
 304
 305         ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter);
 306
 307         if (ret)
 308                 return ret;
 309
 310         if (mode_dev->panel_fixed_mode != NULL) {
 311                 struct drm_display_mode *mode =
 312                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 313                 drm_mode_probed_add(connector, mode);
 314                 return 1;
 315         }
 316
 317         return 0;
 318 }
 319
 320 /**
 321  * cdv_intel_lvds_destroy - unregister and free LVDS structures
 322  * @connector: connector to free
 323  *
 324  * Unregister the DDC bus for this connector then free the driver private
 325  * structure.
 326  */
 327 static void cdv_intel_lvds_destroy(struct drm_connector *connector)
 328 {
 329         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 330
 331         psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 332         drm_connector_unregister(connector);
 333         drm_connector_cleanup(connector);
 334         kfree(connector);
 335 }
 336
 337 static int cdv_intel_lvds_set_property(struct drm_connector *connector,
 338                                        struct drm_property *property,
 339                                        uint64_t value)
 340 {
 341         struct drm_encoder *encoder = connector->encoder;
 342
 343         if (!strcmp(property->name, "scaling mode") && encoder) {
 344                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 345                 uint64_t curValue;
 346
 347                 if (!crtc)
 348                         return -1;
 349
 350                 switch (value) {
 351                 case DRM_MODE_SCALE_FULLSCREEN:
 352                         break;
 353                 case DRM_MODE_SCALE_NO_SCALE:
 354                         break;
 355                 case DRM_MODE_SCALE_ASPECT:
 356                         break;
 357                 default:
 358                         return -1;
 359                 }
 360
 361                 if (drm_object_property_get_value(&connector->base,
 362                                                      property,
 363                                                      &curValue))
 364                         return -1;
 365
 366                 if (curValue == value)
 367                         return 0;
 368
 369                 if (drm_object_property_set_value(&connector->base,
 370                                                         property,
 371                                                         value))
 372                         return -1;
 373
 374                 if (crtc->saved_mode.hdisplay != 0 &&
 375                     crtc->saved_mode.vdisplay != 0) {
 376                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 377                                                       &crtc->saved_mode,
 378                                                       encoder->crtc->x,
 379                                                       encoder->crtc->y,
 380                                                       encoder->crtc->primary->fb))
 381                                 return -1;
 382                 }
 383         } else if (!strcmp(property->name, "backlight") && encoder) {
 384                 if (drm_object_property_set_value(&connector->base,
 385                                                         property,
 386                                                         value))
 387                         return -1;
 388                 else
 389                         gma_backlight_set(encoder->dev, value);
 390         } else if (!strcmp(property->name, "DPMS") && encoder) {
 391                 const struct drm_encoder_helper_funcs *helpers =
 392                                         encoder->helper_private;
 393                 helpers->dpms(encoder, value);
 394         }
 395         return 0;
 396 }
 397
 398 static const struct drm_encoder_helper_funcs
 399                                         cdv_intel_lvds_helper_funcs = {
 400         .dpms = cdv_intel_lvds_encoder_dpms,
 401         .mode_fixup = cdv_intel_lvds_mode_fixup,
 402         .prepare = cdv_intel_lvds_prepare,
 403         .mode_set = cdv_intel_lvds_mode_set,
 404         .commit = cdv_intel_lvds_commit,
 405 };
 406
 407 static const struct drm_connector_helper_funcs
 408                                 cdv_intel_lvds_connector_helper_funcs = {
 409         .get_modes = cdv_intel_lvds_get_modes,
 410         .mode_valid = cdv_intel_lvds_mode_valid,
 411         .best_encoder = gma_best_encoder,
 412 };
 413
 414 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = {
 415         .dpms = drm_helper_connector_dpms,
 416         .fill_modes = drm_helper_probe_single_connector_modes,
 417         .set_property = cdv_intel_lvds_set_property,
 418         .destroy = cdv_intel_lvds_destroy,
 419 };
 420
 421 /*
 422  * Enumerate the child dev array parsed from VBT to check whether
 423  * the LVDS is present.
 424  * If it is present, return 1.
 425  * If it is not present, return false.
 426  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 427  */
 428 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 429                                    u8 *i2c_pin)
 430 {
 431         struct drm_psb_private *dev_priv = dev->dev_private;
 432         int i;
 433
 434         if (!dev_priv->child_dev_num)
 435                 return true;
 436
 437         for (i = 0; i < dev_priv->child_dev_num; i++) {
 438                 struct child_device_config *child = dev_priv->child_dev + i;
 439
 440                 /* If the device type is not LFP, continue.
 441                  * We have to check both the new identifiers as well as the
 442                  * old for compatibility with some BIOSes.
 443                  */
 444                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 445                     child->device_type != DEVICE_TYPE_LFP)
 446                         continue;
 447
 448                 if (child->i2c_pin)
 449                     *i2c_pin = child->i2c_pin;
 450
 451                 /* However, we cannot trust the BIOS writers to populate
 452                  * the VBT correctly.  Since LVDS requires additional
 453                  * information from AIM blocks, a non-zero addin offset is
 454                  * a good indicator that the LVDS is actually present.
 455                  */
 456                 if (child->addin_offset)
 457                         return true;
 458
 459                 /* But even then some BIOS writers perform some black magic
 460                  * and instantiate the device without reference to any
 461                  * additional data.  Trust that if the VBT was written into
 462                  * the OpRegion then they have validated the LVDS's existence.
 463                  */
 464                 if (dev_priv->opregion.vbt)
 465                         return true;
 466         }
 467
 468         return false;
 469 }
 470
 471 /**
 472  * cdv_intel_lvds_init - setup LVDS connectors on this device
 473  * @dev: drm device
 474  *
 475  * Create the connector, register the LVDS DDC bus, and try to figure out what
 476  * modes we can display on the LVDS panel (if present).
 477  */
 478 void cdv_intel_lvds_init(struct drm_device *dev,
 479                      struct psb_intel_mode_device *mode_dev)
 480 {
 481         struct gma_encoder *gma_encoder;
 482         struct gma_connector *gma_connector;
 483         struct cdv_intel_lvds_priv *lvds_priv;
 484         struct drm_connector *connector;
 485         struct drm_encoder *encoder;
 486         struct drm_display_mode *scan;
 487         struct drm_crtc *crtc;
 488         struct drm_psb_private *dev_priv = dev->dev_private;
 489         u32 lvds;
 490         int pipe;
 491         u8 pin;
 492
 493         if (!dev_priv->lvds_enabled_in_vbt)
 494                 return;
 495
 496         pin = GMBUS_PORT_PANEL;
 497         if (!lvds_is_present_in_vbt(dev, &pin)) {
 498                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 499                 return;
 500         }
 501
 502         gma_encoder = kzalloc(sizeof(struct gma_encoder),
 503                                     GFP_KERNEL);
 504         if (!gma_encoder)
 505                 return;
 506
 507         gma_connector = kzalloc(sizeof(struct gma_connector),
 508                                       GFP_KERNEL);
 509         if (!gma_connector)
 510                 goto failed_connector;
 511
 512         lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL);
 513         if (!lvds_priv)
 514                 goto failed_lvds_priv;
 515
 516         gma_encoder->dev_priv = lvds_priv;
 517
 518         connector = &gma_connector->base;
 519         gma_connector->save = cdv_intel_lvds_save;
 520         gma_connector->restore = cdv_intel_lvds_restore;
 521         encoder = &gma_encoder->base;
 522
 523
 524         drm_connector_init(dev, connector,
 525                            &cdv_intel_lvds_connector_funcs,
 526                            DRM_MODE_CONNECTOR_LVDS);
 527
 528         drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 529
 530         gma_connector_attach_encoder(gma_connector, gma_encoder);
 531         gma_encoder->type = INTEL_OUTPUT_LVDS;
 532
 533         drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs);
 534         drm_connector_helper_add(connector,
 535                                  &cdv_intel_lvds_connector_helper_funcs);
 536         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 537         connector->interlace_allowed = false;
 538         connector->doublescan_allowed = false;
 539
 540         /*Attach connector properties*/
 541         drm_object_attach_property(&connector->base,
 542                                       dev->mode_config.scaling_mode_property,
 543                                       DRM_MODE_SCALE_FULLSCREEN);
 544         drm_object_attach_property(&connector->base,
 545                                       dev_priv->backlight_property,
 546                                       BRIGHTNESS_MAX_LEVEL);
 547
 548         /**
 549          * Set up I2C bus
 550          * FIXME: distroy i2c_bus when exit
 551          */
 552         gma_encoder->i2c_bus = psb_intel_i2c_create(dev,
 553                                                          GPIOB,
 554                                                          "LVDSBLC_B");
 555         if (!gma_encoder->i2c_bus) {
 556                 dev_printk(KERN_ERR,
 557                         &dev->pdev->dev, "I2C bus registration failed.\n");
 558                 goto failed_blc_i2c;
 559         }
 560         gma_encoder->i2c_bus->slave_addr = 0x2C;
 561         dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus;
 562
 563         /*
 564          * LVDS discovery:
 565          * 1) check for EDID on DDC
 566          * 2) check for VBT data
 567          * 3) check to see if LVDS is already on
 568          *    if none of the above, no panel
 569          * 4) make sure lid is open
 570          *    if closed, act like it's not there for now
 571          */
 572
 573         /* Set up the DDC bus. */
 574         gma_encoder->ddc_bus = psb_intel_i2c_create(dev,
 575                                                          GPIOC,
 576                                                          "LVDSDDC_C");
 577         if (!gma_encoder->ddc_bus) {
 578                 dev_printk(KERN_ERR, &dev->pdev->dev,
 579                            "DDC bus registration " "failed.\n");
 580                 goto failed_ddc;
 581         }
 582
 583         /*
 584          * Attempt to get the fixed panel mode from DDC.  Assume that the
 585          * preferred mode is the right one.
 586          */
 587         mutex_lock(&dev->mode_config.mutex);
 588         psb_intel_ddc_get_modes(connector,
 589                                 &gma_encoder->ddc_bus->adapter);
 590         list_for_each_entry(scan, &connector->probed_modes, head) {
 591                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 592                         mode_dev->panel_fixed_mode =
 593                             drm_mode_duplicate(dev, scan);
 594                         goto out;       /* FIXME: check for quirks */
 595                 }
 596         }
 597
 598         /* Failed to get EDID, what about VBT? do we need this?*/
 599         if (dev_priv->lfp_lvds_vbt_mode) {
 600                 mode_dev->panel_fixed_mode =
 601                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 602                 if (mode_dev->panel_fixed_mode) {
 603                         mode_dev->panel_fixed_mode->type |=
 604                                 DRM_MODE_TYPE_PREFERRED;
 605                         goto out;       /* FIXME: check for quirks */
 606                 }
 607         }
 608         /*
 609          * If we didn't get EDID, try checking if the panel is already turned
 610          * on.  If so, assume that whatever is currently programmed is the
 611          * correct mode.
 612          */
 613         lvds = REG_READ(LVDS);
 614         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 615         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 616
 617         if (crtc && (lvds & LVDS_PORT_EN)) {
 618                 mode_dev->panel_fixed_mode =
 619                     cdv_intel_crtc_mode_get(dev, crtc);
 620                 if (mode_dev->panel_fixed_mode) {
 621                         mode_dev->panel_fixed_mode->type |=
 622                             DRM_MODE_TYPE_PREFERRED;
 623                         goto out;       /* FIXME: check for quirks */
 624                 }
 625         }
 626
 627         /* If we still don't have a mode after all that, give up. */
 628         if (!mode_dev->panel_fixed_mode) {
 629                 DRM_DEBUG
 630                         ("Found no modes on the lvds, ignoring the LVDS\n");
 631                 goto failed_find;
 632         }
 633
 634         /* setup PWM */
 635         {
 636                 u32 pwm;
 637
 638                 pwm = REG_READ(BLC_PWM_CTL2);
 639                 if (pipe == 1)
 640                         pwm |= PWM_PIPE_B;
 641                 else
 642                         pwm &= ~PWM_PIPE_B;
 643                 pwm |= PWM_ENABLE;
 644                 REG_WRITE(BLC_PWM_CTL2, pwm);
 645         }
 646
 647 out:
 648         mutex_unlock(&dev->mode_config.mutex);
 649         drm_connector_register(connector);
 650         return;
 651
 652 failed_find:
 653         mutex_unlock(&dev->mode_config.mutex);
 654         pr_err("Failed find\n");
 655         psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 656 failed_ddc:
 657         pr_err("Failed DDC\n");
 658         psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 659 failed_blc_i2c:
 660         pr_err("Failed BLC\n");
 661         drm_encoder_cleanup(encoder);
 662         drm_connector_cleanup(connector);
 663         kfree(lvds_priv);
 664 failed_lvds_priv:
 665         kfree(gma_connector);
 666 failed_connector:
 667         kfree(gma_encoder);
 668 }