drivers/gpu/drm/gma500/cdv_intel_lvds.c

   1 /*
   2  * Copyright © 2006-2011 Intel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors:
  18  *      Eric Anholt <eric@anholt.net>
  19  *      Dave Airlie <airlied@linux.ie>
  20  *      Jesse Barnes <jesse.barnes@intel.com>
  21  */
  22
  23 #include <linux/dmi.h>
  24 #include <linux/i2c.h>
  25 #include <linux/pm_runtime.h>
  26
  27 #include "cdv_device.h"
  28 #include "intel_bios.h"
  29 #include "power.h"
  30 #include "psb_drv.h"
  31 #include "psb_intel_drv.h"
  32 #include "psb_intel_reg.h"
  33
  34 /**
  35  * LVDS I2C backlight control macros
  36  */
  37 #define BRIGHTNESS_MAX_LEVEL 100
  38 #define BRIGHTNESS_MASK 0xFF
  39 #define BLC_I2C_TYPE    0x01
  40 #define BLC_PWM_TYPT    0x02
  41
  42 #define BLC_POLARITY_NORMAL 0
  43 #define BLC_POLARITY_INVERSE 1
  44
  45 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
  46 #define PSB_BLC_MIN_PWM_REG_FREQ        (0x2)
  47 #define PSB_BLC_PWM_PRECISION_FACTOR    (10)
  48 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  49 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  50
  51 struct cdv_intel_lvds_priv {
  52         /**
  53          * Saved LVDO output states
  54          */
  55         uint32_t savePP_ON;
  56         uint32_t savePP_OFF;
  57         uint32_t saveLVDS;
  58         uint32_t savePP_CONTROL;
  59         uint32_t savePP_CYCLE;
  60         uint32_t savePFIT_CONTROL;
  61         uint32_t savePFIT_PGM_RATIOS;
  62         uint32_t saveBLC_PWM_CTL;
  63 };
  64
  65 /*
  66  * Returns the maximum level of the backlight duty cycle field.
  67  */
  68 static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev)
  69 {
  70         struct drm_psb_private *dev_priv = dev->dev_private;
  71         u32 retval;
  72
  73         if (gma_power_begin(dev, false)) {
  74                 retval = ((REG_READ(BLC_PWM_CTL) &
  75                           BACKLIGHT_MODULATION_FREQ_MASK) >>
  76                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  77
  78                 gma_power_end(dev);
  79         } else
  80                 retval = ((dev_priv->regs.saveBLC_PWM_CTL &
  81                           BACKLIGHT_MODULATION_FREQ_MASK) >>
  82                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  83
  84         return retval;
  85 }
  86
  87 #if 0
  88 /*
  89  * Set LVDS backlight level by I2C command
  90  */
  91 static int cdv_lvds_i2c_set_brightness(struct drm_device *dev,
  92                                         unsigned int level)
  93 {
  94         struct drm_psb_private *dev_priv = dev->dev_private;
  95         struct psb_intel_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus;
  96         u8 out_buf[2];
  97         unsigned int blc_i2c_brightness;
  98
  99         struct i2c_msg msgs[] = {
 100                 {
 101                         .addr = lvds_i2c_bus->slave_addr,
 102                         .flags = 0,
 103                         .len = 2,
 104                         .buf = out_buf,
 105                 }
 106         };
 107
 108         blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level *
 109                              BRIGHTNESS_MASK /
 110                              BRIGHTNESS_MAX_LEVEL);
 111
 112         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 113                 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness;
 114
 115         out_buf[0] = dev_priv->lvds_bl->brightnesscmd;
 116         out_buf[1] = (u8)blc_i2c_brightness;
 117
 118         if (i2c_transfer(&lvds_i2c_bus->adapter, msgs, 1) == 1)
 119                 return 0;
 120
 121         DRM_ERROR("I2C transfer error\n");
 122         return -1;
 123 }
 124
 125
 126 static int cdv_lvds_pwm_set_brightness(struct drm_device *dev, int level)
 127 {
 128         struct drm_psb_private *dev_priv = dev->dev_private;
 129
 130         u32 max_pwm_blc;
 131         u32 blc_pwm_duty_cycle;
 132
 133         max_pwm_blc = cdv_intel_lvds_get_max_backlight(dev);
 134
 135         /*BLC_PWM_CTL Should be initiated while backlight device init*/
 136         BUG_ON((max_pwm_blc & PSB_BLC_MAX_PWM_REG_FREQ) == 0);
 137
 138         blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
 139
 140         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 141                 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle;
 142
 143         blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
 144         REG_WRITE(BLC_PWM_CTL,
 145                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 146                   (blc_pwm_duty_cycle));
 147
 148         return 0;
 149 }
 150
 151 /*
 152  * Set LVDS backlight level either by I2C or PWM
 153  */
 154 void cdv_intel_lvds_set_brightness(struct drm_device *dev, int level)
 155 {
 156         struct drm_psb_private *dev_priv = dev->dev_private;
 157
 158         if (!dev_priv->lvds_bl) {
 159                 DRM_ERROR("NO LVDS Backlight Info\n");
 160                 return;
 161         }
 162
 163         if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
 164                 cdv_lvds_i2c_set_brightness(dev, level);
 165         else
 166                 cdv_lvds_pwm_set_brightness(dev, level);
 167 }
 168 #endif
 169
 170 /**
 171  * Sets the backlight level.
 172  *
 173  * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight().
 174  */
 175 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level)
 176 {
 177         struct drm_psb_private *dev_priv = dev->dev_private;
 178         u32 blc_pwm_ctl;
 179
 180         if (gma_power_begin(dev, false)) {
 181                 blc_pwm_ctl =
 182                         REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 183                 REG_WRITE(BLC_PWM_CTL,
 184                                 (blc_pwm_ctl |
 185                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 186                 gma_power_end(dev);
 187         } else {
 188                 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
 189                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 190                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 191                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 192         }
 193 }
 194
 195 /**
 196  * Sets the power state for the panel.
 197  */
 198 static void cdv_intel_lvds_set_power(struct drm_device *dev,
 199                                      struct drm_encoder *encoder, bool on)
 200 {
 201         struct drm_psb_private *dev_priv = dev->dev_private;
 202         u32 pp_status;
 203
 204         if (!gma_power_begin(dev, true))
 205                 return;
 206
 207         if (on) {
 208                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 209                           POWER_TARGET_ON);
 210                 do {
 211                         pp_status = REG_READ(PP_STATUS);
 212                 } while ((pp_status & PP_ON) == 0);
 213
 214                 cdv_intel_lvds_set_backlight(dev,
 215                                 dev_priv->mode_dev.backlight_duty_cycle);
 216         } else {
 217                 cdv_intel_lvds_set_backlight(dev, 0);
 218
 219                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 220                           ~POWER_TARGET_ON);
 221                 do {
 222                         pp_status = REG_READ(PP_STATUS);
 223                 } while (pp_status & PP_ON);
 224         }
 225         gma_power_end(dev);
 226 }
 227
 228 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 229 {
 230         struct drm_device *dev = encoder->dev;
 231         if (mode == DRM_MODE_DPMS_ON)
 232                 cdv_intel_lvds_set_power(dev, encoder, true);
 233         else
 234                 cdv_intel_lvds_set_power(dev, encoder, false);
 235         /* XXX: We never power down the LVDS pairs. */
 236 }
 237
 238 static void cdv_intel_lvds_save(struct drm_connector *connector)
 239 {
 240 }
 241
 242 static void cdv_intel_lvds_restore(struct drm_connector *connector)
 243 {
 244 }
 245
 246 static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector,
 247                               struct drm_display_mode *mode)
 248 {
 249         struct drm_device *dev = connector->dev;
 250         struct drm_psb_private *dev_priv = dev->dev_private;
 251         struct drm_display_mode *fixed_mode =
 252                                         dev_priv->mode_dev.panel_fixed_mode;
 253
 254         /* just in case */
 255         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 256                 return MODE_NO_DBLESCAN;
 257
 258         /* just in case */
 259         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 260                 return MODE_NO_INTERLACE;
 261
 262         if (fixed_mode) {
 263                 if (mode->hdisplay > fixed_mode->hdisplay)
 264                         return MODE_PANEL;
 265                 if (mode->vdisplay > fixed_mode->vdisplay)
 266                         return MODE_PANEL;
 267         }
 268         return MODE_OK;
 269 }
 270
 271 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 272                                   const struct drm_display_mode *mode,
 273                                   struct drm_display_mode *adjusted_mode)
 274 {
 275         struct drm_device *dev = encoder->dev;
 276         struct drm_psb_private *dev_priv = dev->dev_private;
 277         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 278         struct drm_encoder *tmp_encoder;
 279         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 280
 281         /* Should never happen!! */
 282         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 283                             head) {
 284                 if (tmp_encoder != encoder
 285                     && tmp_encoder->crtc == encoder->crtc) {
 286                         pr_err("Can't enable LVDS and another encoder on the same pipe\n");
 287                         return false;
 288                 }
 289         }
 290
 291         /*
 292          * If we have timings from the BIOS for the panel, put them in
 293          * to the adjusted mode.  The CRTC will be set up for this mode,
 294          * with the panel scaling set up to source from the H/VDisplay
 295          * of the original mode.
 296          */
 297         if (panel_fixed_mode != NULL) {
 298                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 299                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 300                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 301                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 302                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 303                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 304                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 305                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 306                 adjusted_mode->clock = panel_fixed_mode->clock;
 307                 drm_mode_set_crtcinfo(adjusted_mode,
 308                                       CRTC_INTERLACE_HALVE_V);
 309         }
 310
 311         /*
 312          * XXX: It would be nice to support lower refresh rates on the
 313          * panels to reduce power consumption, and perhaps match the
 314          * user's requested refresh rate.
 315          */
 316
 317         return true;
 318 }
 319
 320 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder)
 321 {
 322         struct drm_device *dev = encoder->dev;
 323         struct drm_psb_private *dev_priv = dev->dev_private;
 324         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 325
 326         if (!gma_power_begin(dev, true))
 327                 return;
 328
 329         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 330         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 331                                           BACKLIGHT_DUTY_CYCLE_MASK);
 332
 333         cdv_intel_lvds_set_power(dev, encoder, false);
 334
 335         gma_power_end(dev);
 336 }
 337
 338 static void cdv_intel_lvds_commit(struct drm_encoder *encoder)
 339 {
 340         struct drm_device *dev = encoder->dev;
 341         struct drm_psb_private *dev_priv = dev->dev_private;
 342         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 343
 344         if (mode_dev->backlight_duty_cycle == 0)
 345                 mode_dev->backlight_duty_cycle =
 346                     cdv_intel_lvds_get_max_backlight(dev);
 347
 348         cdv_intel_lvds_set_power(dev, encoder, true);
 349 }
 350
 351 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder,
 352                                 struct drm_display_mode *mode,
 353                                 struct drm_display_mode *adjusted_mode)
 354 {
 355         struct drm_device *dev = encoder->dev;
 356         struct drm_psb_private *dev_priv = dev->dev_private;
 357         struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
 358         u32 pfit_control;
 359
 360         /*
 361          * The LVDS pin pair will already have been turned on in the
 362          * cdv_intel_crtc_mode_set since it has a large impact on the DPLL
 363          * settings.
 364          */
 365
 366         /*
 367          * Enable automatic panel scaling so that non-native modes fill the
 368          * screen.  Should be enabled before the pipe is enabled, according to
 369          * register description and PRM.
 370          */
 371         if (mode->hdisplay != adjusted_mode->hdisplay ||
 372             mode->vdisplay != adjusted_mode->vdisplay)
 373                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 374                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 375                                 HORIZ_INTERP_BILINEAR);
 376         else
 377                 pfit_control = 0;
 378
 379         pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT;
 380
 381         if (dev_priv->lvds_dither)
 382                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 383
 384         REG_WRITE(PFIT_CONTROL, pfit_control);
 385 }
 386
 387 /**
 388  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 389  */
 390 static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
 391 {
 392         struct drm_device *dev = connector->dev;
 393         struct drm_psb_private *dev_priv = dev->dev_private;
 394         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 395         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 396         int ret;
 397
 398         ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter);
 399
 400         if (ret)
 401                 return ret;
 402
 403         if (mode_dev->panel_fixed_mode != NULL) {
 404                 struct drm_display_mode *mode =
 405                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 406                 drm_mode_probed_add(connector, mode);
 407                 return 1;
 408         }
 409
 410         return 0;
 411 }
 412
 413 /**
 414  * cdv_intel_lvds_destroy - unregister and free LVDS structures
 415  * @connector: connector to free
 416  *
 417  * Unregister the DDC bus for this connector then free the driver private
 418  * structure.
 419  */
 420 static void cdv_intel_lvds_destroy(struct drm_connector *connector)
 421 {
 422         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 423
 424         psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 425         drm_connector_unregister(connector);
 426         drm_connector_cleanup(connector);
 427         kfree(connector);
 428 }
 429
 430 static int cdv_intel_lvds_set_property(struct drm_connector *connector,
 431                                        struct drm_property *property,
 432                                        uint64_t value)
 433 {
 434         struct drm_encoder *encoder = connector->encoder;
 435
 436         if (!strcmp(property->name, "scaling mode") && encoder) {
 437                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 438                 uint64_t curValue;
 439
 440                 if (!crtc)
 441                         return -1;
 442
 443                 switch (value) {
 444                 case DRM_MODE_SCALE_FULLSCREEN:
 445                         break;
 446                 case DRM_MODE_SCALE_NO_SCALE:
 447                         break;
 448                 case DRM_MODE_SCALE_ASPECT:
 449                         break;
 450                 default:
 451                         return -1;
 452                 }
 453
 454                 if (drm_object_property_get_value(&connector->base,
 455                                                      property,
 456                                                      &curValue))
 457                         return -1;
 458
 459                 if (curValue == value)
 460                         return 0;
 461
 462                 if (drm_object_property_set_value(&connector->base,
 463                                                         property,
 464                                                         value))
 465                         return -1;
 466
 467                 if (crtc->saved_mode.hdisplay != 0 &&
 468                     crtc->saved_mode.vdisplay != 0) {
 469                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 470                                                       &crtc->saved_mode,
 471                                                       encoder->crtc->x,
 472                                                       encoder->crtc->y,
 473                                                       encoder->crtc->primary->fb))
 474                                 return -1;
 475                 }
 476         } else if (!strcmp(property->name, "backlight") && encoder) {
 477                 if (drm_object_property_set_value(&connector->base,
 478                                                         property,
 479                                                         value))
 480                         return -1;
 481                 else
 482                         gma_backlight_set(encoder->dev, value);
 483         } else if (!strcmp(property->name, "DPMS") && encoder) {
 484                 const struct drm_encoder_helper_funcs *helpers =
 485                                         encoder->helper_private;
 486                 helpers->dpms(encoder, value);
 487         }
 488         return 0;
 489 }
 490
 491 static const struct drm_encoder_helper_funcs
 492                                         cdv_intel_lvds_helper_funcs = {
 493         .dpms = cdv_intel_lvds_encoder_dpms,
 494         .mode_fixup = cdv_intel_lvds_mode_fixup,
 495         .prepare = cdv_intel_lvds_prepare,
 496         .mode_set = cdv_intel_lvds_mode_set,
 497         .commit = cdv_intel_lvds_commit,
 498 };
 499
 500 static const struct drm_connector_helper_funcs
 501                                 cdv_intel_lvds_connector_helper_funcs = {
 502         .get_modes = cdv_intel_lvds_get_modes,
 503         .mode_valid = cdv_intel_lvds_mode_valid,
 504         .best_encoder = gma_best_encoder,
 505 };
 506
 507 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = {
 508         .dpms = drm_helper_connector_dpms,
 509         .fill_modes = drm_helper_probe_single_connector_modes,
 510         .set_property = cdv_intel_lvds_set_property,
 511         .destroy = cdv_intel_lvds_destroy,
 512 };
 513
 514
 515 static void cdv_intel_lvds_enc_destroy(struct drm_encoder *encoder)
 516 {
 517         drm_encoder_cleanup(encoder);
 518 }
 519
 520 static const struct drm_encoder_funcs cdv_intel_lvds_enc_funcs = {
 521         .destroy = cdv_intel_lvds_enc_destroy,
 522 };
 523
 524 /*
 525  * Enumerate the child dev array parsed from VBT to check whether
 526  * the LVDS is present.
 527  * If it is present, return 1.
 528  * If it is not present, return false.
 529  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 530  */
 531 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 532                                    u8 *i2c_pin)
 533 {
 534         struct drm_psb_private *dev_priv = dev->dev_private;
 535         int i;
 536
 537         if (!dev_priv->child_dev_num)
 538                 return true;
 539
 540         for (i = 0; i < dev_priv->child_dev_num; i++) {
 541                 struct child_device_config *child = dev_priv->child_dev + i;
 542
 543                 /* If the device type is not LFP, continue.
 544                  * We have to check both the new identifiers as well as the
 545                  * old for compatibility with some BIOSes.
 546                  */
 547                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 548                     child->device_type != DEVICE_TYPE_LFP)
 549                         continue;
 550
 551                 if (child->i2c_pin)
 552                     *i2c_pin = child->i2c_pin;
 553
 554                 /* However, we cannot trust the BIOS writers to populate
 555                  * the VBT correctly.  Since LVDS requires additional
 556                  * information from AIM blocks, a non-zero addin offset is
 557                  * a good indicator that the LVDS is actually present.
 558                  */
 559                 if (child->addin_offset)
 560                         return true;
 561
 562                 /* But even then some BIOS writers perform some black magic
 563                  * and instantiate the device without reference to any
 564                  * additional data.  Trust that if the VBT was written into
 565                  * the OpRegion then they have validated the LVDS's existence.
 566                  */
 567                 if (dev_priv->opregion.vbt)
 568                         return true;
 569         }
 570
 571         return false;
 572 }
 573
 574 /**
 575  * cdv_intel_lvds_init - setup LVDS connectors on this device
 576  * @dev: drm device
 577  *
 578  * Create the connector, register the LVDS DDC bus, and try to figure out what
 579  * modes we can display on the LVDS panel (if present).
 580  */
 581 void cdv_intel_lvds_init(struct drm_device *dev,
 582                      struct psb_intel_mode_device *mode_dev)
 583 {
 584         struct gma_encoder *gma_encoder;
 585         struct gma_connector *gma_connector;
 586         struct cdv_intel_lvds_priv *lvds_priv;
 587         struct drm_connector *connector;
 588         struct drm_encoder *encoder;
 589         struct drm_display_mode *scan;
 590         struct drm_crtc *crtc;
 591         struct drm_psb_private *dev_priv = dev->dev_private;
 592         u32 lvds;
 593         int pipe;
 594         u8 pin;
 595
 596         if (!dev_priv->lvds_enabled_in_vbt)
 597                 return;
 598
 599         pin = GMBUS_PORT_PANEL;
 600         if (!lvds_is_present_in_vbt(dev, &pin)) {
 601                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 602                 return;
 603         }
 604
 605         gma_encoder = kzalloc(sizeof(struct gma_encoder),
 606                                     GFP_KERNEL);
 607         if (!gma_encoder)
 608                 return;
 609
 610         gma_connector = kzalloc(sizeof(struct gma_connector),
 611                                       GFP_KERNEL);
 612         if (!gma_connector)
 613                 goto failed_connector;
 614
 615         lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL);
 616         if (!lvds_priv)
 617                 goto failed_lvds_priv;
 618
 619         gma_encoder->dev_priv = lvds_priv;
 620
 621         connector = &gma_connector->base;
 622         gma_connector->save = cdv_intel_lvds_save;
 623         gma_connector->restore = cdv_intel_lvds_restore;
 624         encoder = &gma_encoder->base;
 625
 626
 627         drm_connector_init(dev, connector,
 628                            &cdv_intel_lvds_connector_funcs,
 629                            DRM_MODE_CONNECTOR_LVDS);
 630
 631         drm_encoder_init(dev, encoder,
 632                          &cdv_intel_lvds_enc_funcs,
 633                          DRM_MODE_ENCODER_LVDS, NULL);
 634
 635
 636         gma_connector_attach_encoder(gma_connector, gma_encoder);
 637         gma_encoder->type = INTEL_OUTPUT_LVDS;
 638
 639         drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs);
 640         drm_connector_helper_add(connector,
 641                                  &cdv_intel_lvds_connector_helper_funcs);
 642         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 643         connector->interlace_allowed = false;
 644         connector->doublescan_allowed = false;
 645
 646         /*Attach connector properties*/
 647         drm_object_attach_property(&connector->base,
 648                                       dev->mode_config.scaling_mode_property,
 649                                       DRM_MODE_SCALE_FULLSCREEN);
 650         drm_object_attach_property(&connector->base,
 651                                       dev_priv->backlight_property,
 652                                       BRIGHTNESS_MAX_LEVEL);
 653
 654         /**
 655          * Set up I2C bus
 656          * FIXME: distroy i2c_bus when exit
 657          */
 658         gma_encoder->i2c_bus = psb_intel_i2c_create(dev,
 659                                                          GPIOB,
 660                                                          "LVDSBLC_B");
 661         if (!gma_encoder->i2c_bus) {
 662                 dev_printk(KERN_ERR,
 663                         &dev->pdev->dev, "I2C bus registration failed.\n");
 664                 goto failed_blc_i2c;
 665         }
 666         gma_encoder->i2c_bus->slave_addr = 0x2C;
 667         dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus;
 668
 669         /*
 670          * LVDS discovery:
 671          * 1) check for EDID on DDC
 672          * 2) check for VBT data
 673          * 3) check to see if LVDS is already on
 674          *    if none of the above, no panel
 675          * 4) make sure lid is open
 676          *    if closed, act like it's not there for now
 677          */
 678
 679         /* Set up the DDC bus. */
 680         gma_encoder->ddc_bus = psb_intel_i2c_create(dev,
 681                                                          GPIOC,
 682                                                          "LVDSDDC_C");
 683         if (!gma_encoder->ddc_bus) {
 684                 dev_printk(KERN_ERR, &dev->pdev->dev,
 685                            "DDC bus registration " "failed.\n");
 686                 goto failed_ddc;
 687         }
 688
 689         /*
 690          * Attempt to get the fixed panel mode from DDC.  Assume that the
 691          * preferred mode is the right one.
 692          */
 693         mutex_lock(&dev->mode_config.mutex);
 694         psb_intel_ddc_get_modes(connector,
 695                                 &gma_encoder->ddc_bus->adapter);
 696         list_for_each_entry(scan, &connector->probed_modes, head) {
 697                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 698                         mode_dev->panel_fixed_mode =
 699                             drm_mode_duplicate(dev, scan);
 700                         goto out;       /* FIXME: check for quirks */
 701                 }
 702         }
 703
 704         /* Failed to get EDID, what about VBT? do we need this?*/
 705         if (dev_priv->lfp_lvds_vbt_mode) {
 706                 mode_dev->panel_fixed_mode =
 707                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 708                 if (mode_dev->panel_fixed_mode) {
 709                         mode_dev->panel_fixed_mode->type |=
 710                                 DRM_MODE_TYPE_PREFERRED;
 711                         goto out;       /* FIXME: check for quirks */
 712                 }
 713         }
 714         /*
 715          * If we didn't get EDID, try checking if the panel is already turned
 716          * on.  If so, assume that whatever is currently programmed is the
 717          * correct mode.
 718          */
 719         lvds = REG_READ(LVDS);
 720         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 721         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 722
 723         if (crtc && (lvds & LVDS_PORT_EN)) {
 724                 mode_dev->panel_fixed_mode =
 725                     cdv_intel_crtc_mode_get(dev, crtc);
 726                 if (mode_dev->panel_fixed_mode) {
 727                         mode_dev->panel_fixed_mode->type |=
 728                             DRM_MODE_TYPE_PREFERRED;
 729                         goto out;       /* FIXME: check for quirks */
 730                 }
 731         }
 732
 733         /* If we still don't have a mode after all that, give up. */
 734         if (!mode_dev->panel_fixed_mode) {
 735                 DRM_DEBUG
 736                         ("Found no modes on the lvds, ignoring the LVDS\n");
 737                 goto failed_find;
 738         }
 739
 740         /* setup PWM */
 741         {
 742                 u32 pwm;
 743
 744                 pwm = REG_READ(BLC_PWM_CTL2);
 745                 if (pipe == 1)
 746                         pwm |= PWM_PIPE_B;
 747                 else
 748                         pwm &= ~PWM_PIPE_B;
 749                 pwm |= PWM_ENABLE;
 750                 REG_WRITE(BLC_PWM_CTL2, pwm);
 751         }
 752
 753 out:
 754         mutex_unlock(&dev->mode_config.mutex);
 755         drm_connector_register(connector);
 756         return;
 757
 758 failed_find:
 759         mutex_unlock(&dev->mode_config.mutex);
 760         pr_err("Failed find\n");
 761         psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 762 failed_ddc:
 763         pr_err("Failed DDC\n");
 764         psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 765 failed_blc_i2c:
 766         pr_err("Failed BLC\n");
 767         drm_encoder_cleanup(encoder);
 768         drm_connector_cleanup(connector);
 769         kfree(lvds_priv);
 770 failed_lvds_priv:
 771         kfree(gma_connector);
 772 failed_connector:
 773         kfree(gma_encoder);
 774 }