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 #if 0
  78 /*
  79  * Set LVDS backlight level by I2C command
  80  */
  81 static int cdv_lvds_i2c_set_brightness(struct drm_device *dev,
  82                                         unsigned int level)
  83 {
  84         struct drm_psb_private *dev_priv = dev->dev_private;
  85         struct psb_intel_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus;
  86         u8 out_buf[2];
  87         unsigned int blc_i2c_brightness;
  88
  89         struct i2c_msg msgs[] = {
  90                 {
  91                         .addr = lvds_i2c_bus->slave_addr,
  92                         .flags = 0,
  93                         .len = 2,
  94                         .buf = out_buf,
  95                 }
  96         };
  97
  98         blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level *
  99                              BRIGHTNESS_MASK /
 100                              BRIGHTNESS_MAX_LEVEL);
 101
 102         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 103                 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness;
 104
 105         out_buf[0] = dev_priv->lvds_bl->brightnesscmd;
 106         out_buf[1] = (u8)blc_i2c_brightness;
 107
 108         if (i2c_transfer(&lvds_i2c_bus->adapter, msgs, 1) == 1)
 109                 return 0;
 110
 111         DRM_ERROR("I2C transfer error\n");
 112         return -1;
 113 }
 114
 115
 116 static int cdv_lvds_pwm_set_brightness(struct drm_device *dev, int level)
 117 {
 118         struct drm_psb_private *dev_priv = dev->dev_private;
 119
 120         u32 max_pwm_blc;
 121         u32 blc_pwm_duty_cycle;
 122
 123         max_pwm_blc = cdv_intel_lvds_get_max_backlight(dev);
 124
 125         /*BLC_PWM_CTL Should be initiated while backlight device init*/
 126         BUG_ON((max_pwm_blc & PSB_BLC_MAX_PWM_REG_FREQ) == 0);
 127
 128         blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
 129
 130         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 131                 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle;
 132
 133         blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
 134         REG_WRITE(BLC_PWM_CTL,
 135                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 136                   (blc_pwm_duty_cycle));
 137
 138         return 0;
 139 }
 140
 141 /*
 142  * Set LVDS backlight level either by I2C or PWM
 143  */
 144 void cdv_intel_lvds_set_brightness(struct drm_device *dev, int level)
 145 {
 146         struct drm_psb_private *dev_priv = dev->dev_private;
 147
 148         if (!dev_priv->lvds_bl) {
 149                 DRM_ERROR("NO LVDS Backlight Info\n");
 150                 return;
 151         }
 152
 153         if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
 154                 cdv_lvds_i2c_set_brightness(dev, level);
 155         else
 156                 cdv_lvds_pwm_set_brightness(dev, level);
 157 }
 158 #endif
 159
 160 /**
 161  * Sets the backlight level.
 162  *
 163  * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight().
 164  */
 165 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level)
 166 {
 167         struct drm_psb_private *dev_priv = dev->dev_private;
 168         u32 blc_pwm_ctl;
 169
 170         if (gma_power_begin(dev, false)) {
 171                 blc_pwm_ctl =
 172                         REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 173                 REG_WRITE(BLC_PWM_CTL,
 174                                 (blc_pwm_ctl |
 175                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 176                 gma_power_end(dev);
 177         } else {
 178                 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
 179                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 180                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 181                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 182         }
 183 }
 184
 185 /**
 186  * Sets the power state for the panel.
 187  */
 188 static void cdv_intel_lvds_set_power(struct drm_device *dev,
 189                                      struct drm_encoder *encoder, bool on)
 190 {
 191         struct drm_psb_private *dev_priv = dev->dev_private;
 192         u32 pp_status;
 193
 194         if (!gma_power_begin(dev, true))
 195                 return;
 196
 197         if (on) {
 198                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 199                           POWER_TARGET_ON);
 200                 do {
 201                         pp_status = REG_READ(PP_STATUS);
 202                 } while ((pp_status & PP_ON) == 0);
 203
 204                 cdv_intel_lvds_set_backlight(dev,
 205                                 dev_priv->mode_dev.backlight_duty_cycle);
 206         } else {
 207                 cdv_intel_lvds_set_backlight(dev, 0);
 208
 209                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 210                           ~POWER_TARGET_ON);
 211                 do {
 212                         pp_status = REG_READ(PP_STATUS);
 213                 } while (pp_status & PP_ON);
 214         }
 215         gma_power_end(dev);
 216 }
 217
 218 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 219 {
 220         struct drm_device *dev = encoder->dev;
 221         if (mode == DRM_MODE_DPMS_ON)
 222                 cdv_intel_lvds_set_power(dev, encoder, true);
 223         else
 224                 cdv_intel_lvds_set_power(dev, encoder, false);
 225         /* XXX: We never power down the LVDS pairs. */
 226 }
 227
 228 static void cdv_intel_lvds_save(struct drm_connector *connector)
 229 {
 230 }
 231
 232 static void cdv_intel_lvds_restore(struct drm_connector *connector)
 233 {
 234 }
 235
 236 static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector,
 237                               struct drm_display_mode *mode)
 238 {
 239         struct drm_device *dev = connector->dev;
 240         struct drm_psb_private *dev_priv = dev->dev_private;
 241         struct drm_display_mode *fixed_mode =
 242                                         dev_priv->mode_dev.panel_fixed_mode;
 243
 244         /* just in case */
 245         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 246                 return MODE_NO_DBLESCAN;
 247
 248         /* just in case */
 249         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 250                 return MODE_NO_INTERLACE;
 251
 252         if (fixed_mode) {
 253                 if (mode->hdisplay > fixed_mode->hdisplay)
 254                         return MODE_PANEL;
 255                 if (mode->vdisplay > fixed_mode->vdisplay)
 256                         return MODE_PANEL;
 257         }
 258         return MODE_OK;
 259 }
 260
 261 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 262                                   const struct drm_display_mode *mode,
 263                                   struct drm_display_mode *adjusted_mode)
 264 {
 265         struct drm_device *dev = encoder->dev;
 266         struct drm_psb_private *dev_priv = dev->dev_private;
 267         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 268         struct drm_encoder *tmp_encoder;
 269         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 270
 271         /* Should never happen!! */
 272         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 273                             head) {
 274                 if (tmp_encoder != encoder
 275                     && tmp_encoder->crtc == encoder->crtc) {
 276                         pr_err("Can't enable LVDS and another encoder on the same pipe\n");
 277                         return false;
 278                 }
 279         }
 280
 281         /*
 282          * If we have timings from the BIOS for the panel, put them in
 283          * to the adjusted mode.  The CRTC will be set up for this mode,
 284          * with the panel scaling set up to source from the H/VDisplay
 285          * of the original mode.
 286          */
 287         if (panel_fixed_mode != NULL) {
 288                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 289                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 290                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 291                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 292                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 293                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 294                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 295                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 296                 adjusted_mode->clock = panel_fixed_mode->clock;
 297                 drm_mode_set_crtcinfo(adjusted_mode,
 298                                       CRTC_INTERLACE_HALVE_V);
 299         }
 300
 301         /*
 302          * XXX: It would be nice to support lower refresh rates on the
 303          * panels to reduce power consumption, and perhaps match the
 304          * user's requested refresh rate.
 305          */
 306
 307         return true;
 308 }
 309
 310 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder)
 311 {
 312         struct drm_device *dev = encoder->dev;
 313         struct drm_psb_private *dev_priv = dev->dev_private;
 314         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 315
 316         if (!gma_power_begin(dev, true))
 317                 return;
 318
 319         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 320         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 321                                           BACKLIGHT_DUTY_CYCLE_MASK);
 322
 323         cdv_intel_lvds_set_power(dev, encoder, false);
 324
 325         gma_power_end(dev);
 326 }
 327
 328 static void cdv_intel_lvds_commit(struct drm_encoder *encoder)
 329 {
 330         struct drm_device *dev = encoder->dev;
 331         struct drm_psb_private *dev_priv = dev->dev_private;
 332         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 333
 334         if (mode_dev->backlight_duty_cycle == 0)
 335                 mode_dev->backlight_duty_cycle =
 336                     cdv_intel_lvds_get_max_backlight(dev);
 337
 338         cdv_intel_lvds_set_power(dev, encoder, true);
 339 }
 340
 341 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder,
 342                                 struct drm_display_mode *mode,
 343                                 struct drm_display_mode *adjusted_mode)
 344 {
 345         struct drm_device *dev = encoder->dev;
 346         struct drm_psb_private *dev_priv = dev->dev_private;
 347         struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
 348         u32 pfit_control;
 349
 350         /*
 351          * The LVDS pin pair will already have been turned on in the
 352          * cdv_intel_crtc_mode_set since it has a large impact on the DPLL
 353          * settings.
 354          */
 355
 356         /*
 357          * Enable automatic panel scaling so that non-native modes fill the
 358          * screen.  Should be enabled before the pipe is enabled, according to
 359          * register description and PRM.
 360          */
 361         if (mode->hdisplay != adjusted_mode->hdisplay ||
 362             mode->vdisplay != adjusted_mode->vdisplay)
 363                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 364                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 365                                 HORIZ_INTERP_BILINEAR);
 366         else
 367                 pfit_control = 0;
 368
 369         pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT;
 370
 371         if (dev_priv->lvds_dither)
 372                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 373
 374         REG_WRITE(PFIT_CONTROL, pfit_control);
 375 }
 376
 377 /**
 378  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 379  */
 380 static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
 381 {
 382         struct drm_device *dev = connector->dev;
 383         struct drm_psb_private *dev_priv = dev->dev_private;
 384         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 385         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 386         int ret;
 387
 388         ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter);
 389
 390         if (ret)
 391                 return ret;
 392
 393         if (mode_dev->panel_fixed_mode != NULL) {
 394                 struct drm_display_mode *mode =
 395                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 396                 drm_mode_probed_add(connector, mode);
 397                 return 1;
 398         }
 399
 400         return 0;
 401 }
 402
 403 /**
 404  * cdv_intel_lvds_destroy - unregister and free LVDS structures
 405  * @connector: connector to free
 406  *
 407  * Unregister the DDC bus for this connector then free the driver private
 408  * structure.
 409  */
 410 static void cdv_intel_lvds_destroy(struct drm_connector *connector)
 411 {
 412         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 413
 414         psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 415         drm_connector_unregister(connector);
 416         drm_connector_cleanup(connector);
 417         kfree(connector);
 418 }
 419
 420 static int cdv_intel_lvds_set_property(struct drm_connector *connector,
 421                                        struct drm_property *property,
 422                                        uint64_t value)
 423 {
 424         struct drm_encoder *encoder = connector->encoder;
 425
 426         if (!strcmp(property->name, "scaling mode") && encoder) {
 427                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 428                 uint64_t curValue;
 429
 430                 if (!crtc)
 431                         return -1;
 432
 433                 switch (value) {
 434                 case DRM_MODE_SCALE_FULLSCREEN:
 435                         break;
 436                 case DRM_MODE_SCALE_NO_SCALE:
 437                         break;
 438                 case DRM_MODE_SCALE_ASPECT:
 439                         break;
 440                 default:
 441                         return -1;
 442                 }
 443
 444                 if (drm_object_property_get_value(&connector->base,
 445                                                      property,
 446                                                      &curValue))
 447                         return -1;
 448
 449                 if (curValue == value)
 450                         return 0;
 451
 452                 if (drm_object_property_set_value(&connector->base,
 453                                                         property,
 454                                                         value))
 455                         return -1;
 456
 457                 if (crtc->saved_mode.hdisplay != 0 &&
 458                     crtc->saved_mode.vdisplay != 0) {
 459                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 460                                                       &crtc->saved_mode,
 461                                                       encoder->crtc->x,
 462                                                       encoder->crtc->y,
 463                                                       encoder->crtc->primary->fb))
 464                                 return -1;
 465                 }
 466         } else if (!strcmp(property->name, "backlight") && encoder) {
 467                 if (drm_object_property_set_value(&connector->base,
 468                                                         property,
 469                                                         value))
 470                         return -1;
 471                 else
 472                         gma_backlight_set(encoder->dev, value);
 473         } else if (!strcmp(property->name, "DPMS") && encoder) {
 474                 const struct drm_encoder_helper_funcs *helpers =
 475                                         encoder->helper_private;
 476                 helpers->dpms(encoder, value);
 477         }
 478         return 0;
 479 }
 480
 481 static const struct drm_encoder_helper_funcs
 482                                         cdv_intel_lvds_helper_funcs = {
 483         .dpms = cdv_intel_lvds_encoder_dpms,
 484         .mode_fixup = cdv_intel_lvds_mode_fixup,
 485         .prepare = cdv_intel_lvds_prepare,
 486         .mode_set = cdv_intel_lvds_mode_set,
 487         .commit = cdv_intel_lvds_commit,
 488 };
 489
 490 static const struct drm_connector_helper_funcs
 491                                 cdv_intel_lvds_connector_helper_funcs = {
 492         .get_modes = cdv_intel_lvds_get_modes,
 493         .mode_valid = cdv_intel_lvds_mode_valid,
 494         .best_encoder = gma_best_encoder,
 495 };
 496
 497 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = {
 498         .dpms = drm_helper_connector_dpms,
 499         .fill_modes = drm_helper_probe_single_connector_modes,
 500         .set_property = cdv_intel_lvds_set_property,
 501         .destroy = cdv_intel_lvds_destroy,
 502 };
 503
 504 /*
 505  * Enumerate the child dev array parsed from VBT to check whether
 506  * the LVDS is present.
 507  * If it is present, return 1.
 508  * If it is not present, return false.
 509  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 510  */
 511 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 512                                    u8 *i2c_pin)
 513 {
 514         struct drm_psb_private *dev_priv = dev->dev_private;
 515         int i;
 516
 517         if (!dev_priv->child_dev_num)
 518                 return true;
 519
 520         for (i = 0; i < dev_priv->child_dev_num; i++) {
 521                 struct child_device_config *child = dev_priv->child_dev + i;
 522
 523                 /* If the device type is not LFP, continue.
 524                  * We have to check both the new identifiers as well as the
 525                  * old for compatibility with some BIOSes.
 526                  */
 527                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 528                     child->device_type != DEVICE_TYPE_LFP)
 529                         continue;
 530
 531                 if (child->i2c_pin)
 532                     *i2c_pin = child->i2c_pin;
 533
 534                 /* However, we cannot trust the BIOS writers to populate
 535                  * the VBT correctly.  Since LVDS requires additional
 536                  * information from AIM blocks, a non-zero addin offset is
 537                  * a good indicator that the LVDS is actually present.
 538                  */
 539                 if (child->addin_offset)
 540                         return true;
 541
 542                 /* But even then some BIOS writers perform some black magic
 543                  * and instantiate the device without reference to any
 544                  * additional data.  Trust that if the VBT was written into
 545                  * the OpRegion then they have validated the LVDS's existence.
 546                  */
 547                 if (dev_priv->opregion.vbt)
 548                         return true;
 549         }
 550
 551         return false;
 552 }
 553
 554 /**
 555  * cdv_intel_lvds_init - setup LVDS connectors on this device
 556  * @dev: drm device
 557  *
 558  * Create the connector, register the LVDS DDC bus, and try to figure out what
 559  * modes we can display on the LVDS panel (if present).
 560  */
 561 void cdv_intel_lvds_init(struct drm_device *dev,
 562                      struct psb_intel_mode_device *mode_dev)
 563 {
 564         struct gma_encoder *gma_encoder;
 565         struct gma_connector *gma_connector;
 566         struct cdv_intel_lvds_priv *lvds_priv;
 567         struct drm_connector *connector;
 568         struct drm_encoder *encoder;
 569         struct drm_display_mode *scan;
 570         struct drm_crtc *crtc;
 571         struct drm_psb_private *dev_priv = dev->dev_private;
 572         u32 lvds;
 573         int pipe;
 574         u8 pin;
 575
 576         if (!dev_priv->lvds_enabled_in_vbt)
 577                 return;
 578
 579         pin = GMBUS_PORT_PANEL;
 580         if (!lvds_is_present_in_vbt(dev, &pin)) {
 581                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 582                 return;
 583         }
 584
 585         gma_encoder = kzalloc(sizeof(struct gma_encoder),
 586                                     GFP_KERNEL);
 587         if (!gma_encoder)
 588                 return;
 589
 590         gma_connector = kzalloc(sizeof(struct gma_connector),
 591                                       GFP_KERNEL);
 592         if (!gma_connector)
 593                 goto failed_connector;
 594
 595         lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL);
 596         if (!lvds_priv)
 597                 goto failed_lvds_priv;
 598
 599         gma_encoder->dev_priv = lvds_priv;
 600
 601         connector = &gma_connector->base;
 602         gma_connector->save = cdv_intel_lvds_save;
 603         gma_connector->restore = cdv_intel_lvds_restore;
 604         encoder = &gma_encoder->base;
 605
 606
 607         drm_connector_init(dev, connector,
 608                            &cdv_intel_lvds_connector_funcs,
 609                            DRM_MODE_CONNECTOR_LVDS);
 610
 611         drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 612
 613         gma_connector_attach_encoder(gma_connector, gma_encoder);
 614         gma_encoder->type = INTEL_OUTPUT_LVDS;
 615
 616         drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs);
 617         drm_connector_helper_add(connector,
 618                                  &cdv_intel_lvds_connector_helper_funcs);
 619         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 620         connector->interlace_allowed = false;
 621         connector->doublescan_allowed = false;
 622
 623         /*Attach connector properties*/
 624         drm_object_attach_property(&connector->base,
 625                                       dev->mode_config.scaling_mode_property,
 626                                       DRM_MODE_SCALE_FULLSCREEN);
 627         drm_object_attach_property(&connector->base,
 628                                       dev_priv->backlight_property,
 629                                       BRIGHTNESS_MAX_LEVEL);
 630
 631         /**
 632          * Set up I2C bus
 633          * FIXME: distroy i2c_bus when exit
 634          */
 635         gma_encoder->i2c_bus = psb_intel_i2c_create(dev,
 636                                                          GPIOB,
 637                                                          "LVDSBLC_B");
 638         if (!gma_encoder->i2c_bus) {
 639                 dev_printk(KERN_ERR,
 640                         &dev->pdev->dev, "I2C bus registration failed.\n");
 641                 goto failed_blc_i2c;
 642         }
 643         gma_encoder->i2c_bus->slave_addr = 0x2C;
 644         dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus;
 645
 646         /*
 647          * LVDS discovery:
 648          * 1) check for EDID on DDC
 649          * 2) check for VBT data
 650          * 3) check to see if LVDS is already on
 651          *    if none of the above, no panel
 652          * 4) make sure lid is open
 653          *    if closed, act like it's not there for now
 654          */
 655
 656         /* Set up the DDC bus. */
 657         gma_encoder->ddc_bus = psb_intel_i2c_create(dev,
 658                                                          GPIOC,
 659                                                          "LVDSDDC_C");
 660         if (!gma_encoder->ddc_bus) {
 661                 dev_printk(KERN_ERR, &dev->pdev->dev,
 662                            "DDC bus registration " "failed.\n");
 663                 goto failed_ddc;
 664         }
 665
 666         /*
 667          * Attempt to get the fixed panel mode from DDC.  Assume that the
 668          * preferred mode is the right one.
 669          */
 670         mutex_lock(&dev->mode_config.mutex);
 671         psb_intel_ddc_get_modes(connector,
 672                                 &gma_encoder->ddc_bus->adapter);
 673         list_for_each_entry(scan, &connector->probed_modes, head) {
 674                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 675                         mode_dev->panel_fixed_mode =
 676                             drm_mode_duplicate(dev, scan);
 677                         goto out;       /* FIXME: check for quirks */
 678                 }
 679         }
 680
 681         /* Failed to get EDID, what about VBT? do we need this?*/
 682         if (dev_priv->lfp_lvds_vbt_mode) {
 683                 mode_dev->panel_fixed_mode =
 684                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 685                 if (mode_dev->panel_fixed_mode) {
 686                         mode_dev->panel_fixed_mode->type |=
 687                                 DRM_MODE_TYPE_PREFERRED;
 688                         goto out;       /* FIXME: check for quirks */
 689                 }
 690         }
 691         /*
 692          * If we didn't get EDID, try checking if the panel is already turned
 693          * on.  If so, assume that whatever is currently programmed is the
 694          * correct mode.
 695          */
 696         lvds = REG_READ(LVDS);
 697         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 698         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 699
 700         if (crtc && (lvds & LVDS_PORT_EN)) {
 701                 mode_dev->panel_fixed_mode =
 702                     cdv_intel_crtc_mode_get(dev, crtc);
 703                 if (mode_dev->panel_fixed_mode) {
 704                         mode_dev->panel_fixed_mode->type |=
 705                             DRM_MODE_TYPE_PREFERRED;
 706                         goto out;       /* FIXME: check for quirks */
 707                 }
 708         }
 709
 710         /* If we still don't have a mode after all that, give up. */
 711         if (!mode_dev->panel_fixed_mode) {
 712                 DRM_DEBUG
 713                         ("Found no modes on the lvds, ignoring the LVDS\n");
 714                 goto failed_find;
 715         }
 716
 717         /* setup PWM */
 718         {
 719                 u32 pwm;
 720
 721                 pwm = REG_READ(BLC_PWM_CTL2);
 722                 if (pipe == 1)
 723                         pwm |= PWM_PIPE_B;
 724                 else
 725                         pwm &= ~PWM_PIPE_B;
 726                 pwm |= PWM_ENABLE;
 727                 REG_WRITE(BLC_PWM_CTL2, pwm);
 728         }
 729
 730 out:
 731         mutex_unlock(&dev->mode_config.mutex);
 732         drm_connector_register(connector);
 733         return;
 734
 735 failed_find:
 736         mutex_unlock(&dev->mode_config.mutex);
 737         pr_err("Failed find\n");
 738         psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 739 failed_ddc:
 740         pr_err("Failed DDC\n");
 741         psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 742 failed_blc_i2c:
 743         pr_err("Failed BLC\n");
 744         drm_encoder_cleanup(encoder);
 745         drm_connector_cleanup(connector);
 746         kfree(lvds_priv);
 747 failed_lvds_priv:
 748         kfree(gma_connector);
 749 failed_connector:
 750         kfree(gma_encoder);
 751 }