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/i2c.h>
  24 #include <linux/dmi.h>
  25 #include <drm/drmP.h>
  26
  27 #include "intel_bios.h"
  28 #include "psb_drv.h"
  29 #include "psb_intel_drv.h"
  30 #include "psb_intel_reg.h"
  31 #include "power.h"
  32 #include <linux/pm_runtime.h>
  33 #include "cdv_device.h"
  34
  35 /**
  36  * LVDS I2C backlight control macros
  37  */
  38 #define BRIGHTNESS_MAX_LEVEL 100
  39 #define BRIGHTNESS_MASK 0xFF
  40 #define BLC_I2C_TYPE    0x01
  41 #define BLC_PWM_TYPT    0x02
  42
  43 #define BLC_POLARITY_NORMAL 0
  44 #define BLC_POLARITY_INVERSE 1
  45
  46 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
  47 #define PSB_BLC_MIN_PWM_REG_FREQ        (0x2)
  48 #define PSB_BLC_PWM_PRECISION_FACTOR    (10)
  49 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  50 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  51
  52 struct cdv_intel_lvds_priv {
  53         /**
  54          * Saved LVDO output states
  55          */
  56         uint32_t savePP_ON;
  57         uint32_t savePP_OFF;
  58         uint32_t saveLVDS;
  59         uint32_t savePP_CONTROL;
  60         uint32_t savePP_CYCLE;
  61         uint32_t savePFIT_CONTROL;
  62         uint32_t savePFIT_PGM_RATIOS;
  63         uint32_t saveBLC_PWM_CTL;
  64 };
  65
  66 /*
  67  * Returns the maximum level of the backlight duty cycle field.
  68  */
  69 static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev)
  70 {
  71         struct drm_psb_private *dev_priv = dev->dev_private;
  72         u32 retval;
  73
  74         if (gma_power_begin(dev, false)) {
  75                 retval = ((REG_READ(BLC_PWM_CTL) &
  76                           BACKLIGHT_MODULATION_FREQ_MASK) >>
  77                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  78
  79                 gma_power_end(dev);
  80         } else
  81                 retval = ((dev_priv->saveBLC_PWM_CTL &
  82                           BACKLIGHT_MODULATION_FREQ_MASK) >>
  83                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  84
  85         return retval;
  86 }
  87
  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
 169 /**
 170  * Sets the backlight level.
 171  *
 172  * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight().
 173  */
 174 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level)
 175 {
 176         struct drm_psb_private *dev_priv = dev->dev_private;
 177         u32 blc_pwm_ctl;
 178
 179         if (gma_power_begin(dev, false)) {
 180                 blc_pwm_ctl =
 181                         REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 182                 REG_WRITE(BLC_PWM_CTL,
 183                                 (blc_pwm_ctl |
 184                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 185                 gma_power_end(dev);
 186         } else {
 187                 blc_pwm_ctl = dev_priv->saveBLC_PWM_CTL &
 188                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 189                 dev_priv->saveBLC_PWM_CTL = (blc_pwm_ctl |
 190                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 191         }
 192 }
 193
 194 /**
 195  * Sets the power state for the panel.
 196  */
 197 static void cdv_intel_lvds_set_power(struct drm_device *dev,
 198                                      struct drm_encoder *encoder, bool on)
 199 {
 200         struct drm_psb_private *dev_priv = dev->dev_private;
 201         u32 pp_status;
 202
 203         if (!gma_power_begin(dev, true))
 204                 return;
 205
 206         if (on) {
 207                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 208                           POWER_TARGET_ON);
 209                 do {
 210                         pp_status = REG_READ(PP_STATUS);
 211                 } while ((pp_status & PP_ON) == 0);
 212
 213                 cdv_intel_lvds_set_backlight(dev,
 214                                 dev_priv->mode_dev.backlight_duty_cycle);
 215         } else {
 216                 cdv_intel_lvds_set_backlight(dev, 0);
 217
 218                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 219                           ~POWER_TARGET_ON);
 220                 do {
 221                         pp_status = REG_READ(PP_STATUS);
 222                 } while (pp_status & PP_ON);
 223         }
 224         gma_power_end(dev);
 225 }
 226
 227 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 228 {
 229         struct drm_device *dev = encoder->dev;
 230         if (mode == DRM_MODE_DPMS_ON)
 231                 cdv_intel_lvds_set_power(dev, encoder, true);
 232         else
 233                 cdv_intel_lvds_set_power(dev, encoder, false);
 234         /* XXX: We never power down the LVDS pairs. */
 235 }
 236
 237 static void cdv_intel_lvds_save(struct drm_connector *connector)
 238 {
 239 }
 240
 241 static void cdv_intel_lvds_restore(struct drm_connector *connector)
 242 {
 243 }
 244
 245 int cdv_intel_lvds_mode_valid(struct drm_connector *connector,
 246                               struct drm_display_mode *mode)
 247 {
 248         struct drm_device *dev = connector->dev;
 249         struct drm_psb_private *dev_priv = dev->dev_private;
 250         struct drm_display_mode *fixed_mode =
 251                                         dev_priv->mode_dev.panel_fixed_mode;
 252
 253         /* just in case */
 254         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 255                 return MODE_NO_DBLESCAN;
 256
 257         /* just in case */
 258         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 259                 return MODE_NO_INTERLACE;
 260
 261         if (fixed_mode) {
 262                 if (mode->hdisplay > fixed_mode->hdisplay)
 263                         return MODE_PANEL;
 264                 if (mode->vdisplay > fixed_mode->vdisplay)
 265                         return MODE_PANEL;
 266         }
 267         return MODE_OK;
 268 }
 269
 270 bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 271                                   struct drm_display_mode *mode,
 272                                   struct drm_display_mode *adjusted_mode)
 273 {
 274         struct drm_device *dev = encoder->dev;
 275         struct drm_psb_private *dev_priv = dev->dev_private;
 276         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 277         struct drm_encoder *tmp_encoder;
 278         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 279
 280         /* Should never happen!! */
 281         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 282                             head) {
 283                 if (tmp_encoder != encoder
 284                     && tmp_encoder->crtc == encoder->crtc) {
 285                         printk(KERN_ERR "Can't enable LVDS and another "
 286                                "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         u32 pfit_control;
 358
 359         /*
 360          * The LVDS pin pair will already have been turned on in the
 361          * cdv_intel_crtc_mode_set since it has a large impact on the DPLL
 362          * settings.
 363          */
 364
 365         /*
 366          * Enable automatic panel scaling so that non-native modes fill the
 367          * screen.  Should be enabled before the pipe is enabled, according to
 368          * register description and PRM.
 369          */
 370         if (mode->hdisplay != adjusted_mode->hdisplay ||
 371             mode->vdisplay != adjusted_mode->vdisplay)
 372                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 373                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 374                                 HORIZ_INTERP_BILINEAR);
 375         else
 376                 pfit_control = 0;
 377
 378         if (dev_priv->lvds_dither)
 379                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 380
 381         REG_WRITE(PFIT_CONTROL, pfit_control);
 382 }
 383
 384 /**
 385  * Detect the LVDS connection.
 386  *
 387  * This always returns CONNECTOR_STATUS_CONNECTED.
 388  * This connector should only have
 389  * been set up if the LVDS was actually connected anyway.
 390  */
 391 static enum drm_connector_status cdv_intel_lvds_detect(
 392                                 struct drm_connector *connector, bool force)
 393 {
 394         return connector_status_connected;
 395 }
 396
 397 /**
 398  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 399  */
 400 static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
 401 {
 402         struct drm_device *dev = connector->dev;
 403         struct drm_psb_private *dev_priv = dev->dev_private;
 404         struct psb_intel_encoder *psb_intel_encoder =
 405                                         psb_intel_attached_encoder(connector);
 406         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 407         int ret;
 408
 409         ret = psb_intel_ddc_get_modes(connector, &psb_intel_encoder->i2c_bus->adapter);
 410
 411         if (ret)
 412                 return ret;
 413
 414         /* Didn't get an EDID, so
 415          * Set wide sync ranges so we get all modes
 416          * handed to valid_mode for checking
 417          */
 418         connector->display_info.min_vfreq = 0;
 419         connector->display_info.max_vfreq = 200;
 420         connector->display_info.min_hfreq = 0;
 421         connector->display_info.max_hfreq = 200;
 422         if (mode_dev->panel_fixed_mode != NULL) {
 423                 struct drm_display_mode *mode =
 424                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 425                 drm_mode_probed_add(connector, mode);
 426                 return 1;
 427         }
 428
 429         return 0;
 430 }
 431
 432 /**
 433  * cdv_intel_lvds_destroy - unregister and free LVDS structures
 434  * @connector: connector to free
 435  *
 436  * Unregister the DDC bus for this connector then free the driver private
 437  * structure.
 438  */
 439 void cdv_intel_lvds_destroy(struct drm_connector *connector)
 440 {
 441         struct psb_intel_encoder *psb_intel_encoder =
 442                                         psb_intel_attached_encoder(connector);
 443
 444         if (psb_intel_encoder->i2c_bus)
 445                 psb_intel_i2c_destroy(psb_intel_encoder->i2c_bus);
 446         drm_sysfs_connector_remove(connector);
 447         drm_connector_cleanup(connector);
 448         kfree(connector);
 449 }
 450
 451 int cdv_intel_lvds_set_property(struct drm_connector *connector,
 452                                        struct drm_property *property,
 453                                        uint64_t value)
 454 {
 455         struct drm_encoder *encoder = connector->encoder;
 456
 457         if (!strcmp(property->name, "scaling mode") && encoder) {
 458                 struct psb_intel_crtc *crtc =
 459                                         to_psb_intel_crtc(encoder->crtc);
 460                 uint64_t curValue;
 461
 462                 if (!crtc)
 463                         return -1;
 464
 465                 switch (value) {
 466                 case DRM_MODE_SCALE_FULLSCREEN:
 467                         break;
 468                 case DRM_MODE_SCALE_NO_SCALE:
 469                         break;
 470                 case DRM_MODE_SCALE_ASPECT:
 471                         break;
 472                 default:
 473                         return -1;
 474                 }
 475
 476                 if (drm_connector_property_get_value(connector,
 477                                                      property,
 478                                                      &curValue))
 479                         return -1;
 480
 481                 if (curValue == value)
 482                         return 0;
 483
 484                 if (drm_connector_property_set_value(connector,
 485                                                         property,
 486                                                         value))
 487                         return -1;
 488
 489                 if (crtc->saved_mode.hdisplay != 0 &&
 490                     crtc->saved_mode.vdisplay != 0) {
 491                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 492                                                       &crtc->saved_mode,
 493                                                       encoder->crtc->x,
 494                                                       encoder->crtc->y,
 495                                                       encoder->crtc->fb))
 496                                 return -1;
 497                 }
 498         } else if (!strcmp(property->name, "backlight") && encoder) {
 499                 if (drm_connector_property_set_value(connector,
 500                                                         property,
 501                                                         value))
 502                         return -1;
 503                 else {
 504 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 505                         struct drm_psb_private *dev_priv =
 506                                                 encoder->dev->dev_private;
 507                         struct backlight_device *bd =
 508                                                 dev_priv->backlight_device;
 509                         bd->props.brightness = value;
 510                         backlight_update_status(bd);
 511 #endif
 512                 }
 513         } else if (!strcmp(property->name, "DPMS") && encoder) {
 514                 struct drm_encoder_helper_funcs *helpers =
 515                                         encoder->helper_private;
 516                 helpers->dpms(encoder, value);
 517         }
 518         return 0;
 519 }
 520
 521 static const struct drm_encoder_helper_funcs
 522                                         cdv_intel_lvds_helper_funcs = {
 523         .dpms = cdv_intel_lvds_encoder_dpms,
 524         .mode_fixup = cdv_intel_lvds_mode_fixup,
 525         .prepare = cdv_intel_lvds_prepare,
 526         .mode_set = cdv_intel_lvds_mode_set,
 527         .commit = cdv_intel_lvds_commit,
 528 };
 529
 530 static const struct drm_connector_helper_funcs
 531                                 cdv_intel_lvds_connector_helper_funcs = {
 532         .get_modes = cdv_intel_lvds_get_modes,
 533         .mode_valid = cdv_intel_lvds_mode_valid,
 534         .best_encoder = psb_intel_best_encoder,
 535 };
 536
 537 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = {
 538         .dpms = drm_helper_connector_dpms,
 539         .save = cdv_intel_lvds_save,
 540         .restore = cdv_intel_lvds_restore,
 541         .detect = cdv_intel_lvds_detect,
 542         .fill_modes = drm_helper_probe_single_connector_modes,
 543         .set_property = cdv_intel_lvds_set_property,
 544         .destroy = cdv_intel_lvds_destroy,
 545 };
 546
 547
 548 static void cdv_intel_lvds_enc_destroy(struct drm_encoder *encoder)
 549 {
 550         drm_encoder_cleanup(encoder);
 551 }
 552
 553 const struct drm_encoder_funcs cdv_intel_lvds_enc_funcs = {
 554         .destroy = cdv_intel_lvds_enc_destroy,
 555 };
 556
 557 /**
 558  * cdv_intel_lvds_init - setup LVDS connectors on this device
 559  * @dev: drm device
 560  *
 561  * Create the connector, register the LVDS DDC bus, and try to figure out what
 562  * modes we can display on the LVDS panel (if present).
 563  */
 564 void cdv_intel_lvds_init(struct drm_device *dev,
 565                      struct psb_intel_mode_device *mode_dev)
 566 {
 567         struct psb_intel_encoder *psb_intel_encoder;
 568         struct psb_intel_connector *psb_intel_connector;
 569         struct cdv_intel_lvds_priv *lvds_priv;
 570         struct drm_connector *connector;
 571         struct drm_encoder *encoder;
 572         struct drm_display_mode *scan;
 573         struct drm_crtc *crtc;
 574         struct drm_psb_private *dev_priv = dev->dev_private;
 575         u32 lvds;
 576         int pipe;
 577
 578         psb_intel_encoder = kzalloc(sizeof(struct psb_intel_encoder),
 579                                     GFP_KERNEL);
 580         if (!psb_intel_encoder)
 581                 return;
 582
 583         psb_intel_connector = kzalloc(sizeof(struct psb_intel_connector),
 584                                       GFP_KERNEL);
 585         if (!psb_intel_connector)
 586                 goto failed_connector;
 587
 588         lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL);
 589         if (!lvds_priv)
 590                 goto failed_lvds_priv;
 591
 592         psb_intel_encoder->dev_priv = lvds_priv;
 593
 594         connector = &psb_intel_connector->base;
 595         encoder = &psb_intel_encoder->base;
 596
 597
 598         drm_connector_init(dev, connector,
 599                            &cdv_intel_lvds_connector_funcs,
 600                            DRM_MODE_CONNECTOR_LVDS);
 601
 602         drm_encoder_init(dev, encoder,
 603                          &cdv_intel_lvds_enc_funcs,
 604                          DRM_MODE_ENCODER_LVDS);
 605
 606
 607         psb_intel_connector_attach_encoder(psb_intel_connector,
 608                                            psb_intel_encoder);
 609         psb_intel_encoder->type = INTEL_OUTPUT_LVDS;
 610
 611         drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs);
 612         drm_connector_helper_add(connector,
 613                                  &cdv_intel_lvds_connector_helper_funcs);
 614         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 615         connector->interlace_allowed = false;
 616         connector->doublescan_allowed = false;
 617
 618         /*Attach connector properties*/
 619         drm_connector_attach_property(connector,
 620                                       dev->mode_config.scaling_mode_property,
 621                                       DRM_MODE_SCALE_FULLSCREEN);
 622         drm_connector_attach_property(connector,
 623                                       dev_priv->backlight_property,
 624                                       BRIGHTNESS_MAX_LEVEL);
 625
 626         /**
 627          * Set up I2C bus
 628          * FIXME: distroy i2c_bus when exit
 629          */
 630         psb_intel_encoder->i2c_bus = psb_intel_i2c_create(dev,
 631                                                          GPIOB,
 632                                                          "LVDSBLC_B");
 633         if (!psb_intel_encoder->i2c_bus) {
 634                 dev_printk(KERN_ERR,
 635                         &dev->pdev->dev, "I2C bus registration failed.\n");
 636                 goto failed_blc_i2c;
 637         }
 638         psb_intel_encoder->i2c_bus->slave_addr = 0x2C;
 639         dev_priv->lvds_i2c_bus = psb_intel_encoder->i2c_bus;
 640
 641         /*
 642          * LVDS discovery:
 643          * 1) check for EDID on DDC
 644          * 2) check for VBT data
 645          * 3) check to see if LVDS is already on
 646          *    if none of the above, no panel
 647          * 4) make sure lid is open
 648          *    if closed, act like it's not there for now
 649          */
 650
 651         /* Set up the DDC bus. */
 652         psb_intel_encoder->ddc_bus = psb_intel_i2c_create(dev,
 653                                                          GPIOC,
 654                                                          "LVDSDDC_C");
 655         if (!psb_intel_encoder->ddc_bus) {
 656                 dev_printk(KERN_ERR, &dev->pdev->dev,
 657                            "DDC bus registration " "failed.\n");
 658                 goto failed_ddc;
 659         }
 660
 661         /*
 662          * Attempt to get the fixed panel mode from DDC.  Assume that the
 663          * preferred mode is the right one.
 664          */
 665         psb_intel_ddc_get_modes(connector,
 666                                 &psb_intel_encoder->ddc_bus->adapter);
 667         list_for_each_entry(scan, &connector->probed_modes, head) {
 668                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 669                         mode_dev->panel_fixed_mode =
 670                             drm_mode_duplicate(dev, scan);
 671                         goto out;       /* FIXME: check for quirks */
 672                 }
 673         }
 674
 675         /* Failed to get EDID, what about VBT? do we need this?*/
 676         if (dev_priv->lfp_lvds_vbt_mode) {
 677                 mode_dev->panel_fixed_mode =
 678                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 679                 if (mode_dev->panel_fixed_mode) {
 680                         mode_dev->panel_fixed_mode->type |=
 681                                 DRM_MODE_TYPE_PREFERRED;
 682                         goto out;       /* FIXME: check for quirks */
 683                 }
 684         }
 685         /*
 686          * If we didn't get EDID, try checking if the panel is already turned
 687          * on.  If so, assume that whatever is currently programmed is the
 688          * correct mode.
 689          */
 690         lvds = REG_READ(LVDS);
 691         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 692         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 693
 694         if (crtc && (lvds & LVDS_PORT_EN)) {
 695                 mode_dev->panel_fixed_mode =
 696                     cdv_intel_crtc_mode_get(dev, crtc);
 697                 if (mode_dev->panel_fixed_mode) {
 698                         mode_dev->panel_fixed_mode->type |=
 699                             DRM_MODE_TYPE_PREFERRED;
 700                         goto out;       /* FIXME: check for quirks */
 701                 }
 702         }
 703
 704         /* If we still don't have a mode after all that, give up. */
 705         if (!mode_dev->panel_fixed_mode) {
 706                 DRM_DEBUG
 707                         ("Found no modes on the lvds, ignoring the LVDS\n");
 708                 goto failed_find;
 709         }
 710
 711 out:
 712         drm_sysfs_connector_add(connector);
 713         return;
 714
 715 failed_find:
 716         printk(KERN_ERR "Failed find\n");
 717         if (psb_intel_encoder->ddc_bus)
 718                 psb_intel_i2c_destroy(psb_intel_encoder->ddc_bus);
 719 failed_ddc:
 720         printk(KERN_ERR "Failed DDC\n");
 721         if (psb_intel_encoder->i2c_bus)
 722                 psb_intel_i2c_destroy(psb_intel_encoder->i2c_bus);
 723 failed_blc_i2c:
 724         printk(KERN_ERR "Failed BLC\n");
 725         drm_encoder_cleanup(encoder);
 726         drm_connector_cleanup(connector);
 727         kfree(lvds_priv);
 728 failed_lvds_priv:
 729         kfree(psb_intel_connector);
 730 failed_connector:
 731         kfree(psb_intel_encoder);
 732 }