kernel/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->regs.saveBLC_PWM_CTL &
  82                           BACKLIGHT_MODULATION_FREQ_MASK) >>
  83                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  84
  85         return retval;
  86 }
  87
  88 #if 0
  89 /*
  90  * Set LVDS backlight level by I2C command
  91  */
  92 static int cdv_lvds_i2c_set_brightness(struct drm_device *dev,
  93                                         unsigned int level)
  94 {
  95         struct drm_psb_private *dev_priv = dev->dev_private;
  96         struct psb_intel_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus;
  97         u8 out_buf[2];
  98         unsigned int blc_i2c_brightness;
  99
 100         struct i2c_msg msgs[] = {
 101                 {
 102                         .addr = lvds_i2c_bus->slave_addr,
 103                         .flags = 0,
 104                         .len = 2,
 105                         .buf = out_buf,
 106                 }
 107         };
 108
 109         blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level *
 110                              BRIGHTNESS_MASK /
 111                              BRIGHTNESS_MAX_LEVEL);
 112
 113         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 114                 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness;
 115
 116         out_buf[0] = dev_priv->lvds_bl->brightnesscmd;
 117         out_buf[1] = (u8)blc_i2c_brightness;
 118
 119         if (i2c_transfer(&lvds_i2c_bus->adapter, msgs, 1) == 1)
 120                 return 0;
 121
 122         DRM_ERROR("I2C transfer error\n");
 123         return -1;
 124 }
 125
 126
 127 static int cdv_lvds_pwm_set_brightness(struct drm_device *dev, int level)
 128 {
 129         struct drm_psb_private *dev_priv = dev->dev_private;
 130
 131         u32 max_pwm_blc;
 132         u32 blc_pwm_duty_cycle;
 133
 134         max_pwm_blc = cdv_intel_lvds_get_max_backlight(dev);
 135
 136         /*BLC_PWM_CTL Should be initiated while backlight device init*/
 137         BUG_ON((max_pwm_blc & PSB_BLC_MAX_PWM_REG_FREQ) == 0);
 138
 139         blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
 140
 141         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 142                 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle;
 143
 144         blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
 145         REG_WRITE(BLC_PWM_CTL,
 146                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 147                   (blc_pwm_duty_cycle));
 148
 149         return 0;
 150 }
 151
 152 /*
 153  * Set LVDS backlight level either by I2C or PWM
 154  */
 155 void cdv_intel_lvds_set_brightness(struct drm_device *dev, int level)
 156 {
 157         struct drm_psb_private *dev_priv = dev->dev_private;
 158
 159         if (!dev_priv->lvds_bl) {
 160                 DRM_ERROR("NO LVDS Backlight Info\n");
 161                 return;
 162         }
 163
 164         if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
 165                 cdv_lvds_i2c_set_brightness(dev, level);
 166         else
 167                 cdv_lvds_pwm_set_brightness(dev, level);
 168 }
 169 #endif
 170
 171 /**
 172  * Sets the backlight level.
 173  *
 174  * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight().
 175  */
 176 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level)
 177 {
 178         struct drm_psb_private *dev_priv = dev->dev_private;
 179         u32 blc_pwm_ctl;
 180
 181         if (gma_power_begin(dev, false)) {
 182                 blc_pwm_ctl =
 183                         REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 184                 REG_WRITE(BLC_PWM_CTL,
 185                                 (blc_pwm_ctl |
 186                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 187                 gma_power_end(dev);
 188         } else {
 189                 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
 190                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 191                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 192                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 193         }
 194 }
 195
 196 /**
 197  * Sets the power state for the panel.
 198  */
 199 static void cdv_intel_lvds_set_power(struct drm_device *dev,
 200                                      struct drm_encoder *encoder, bool on)
 201 {
 202         struct drm_psb_private *dev_priv = dev->dev_private;
 203         u32 pp_status;
 204
 205         if (!gma_power_begin(dev, true))
 206                 return;
 207
 208         if (on) {
 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) == 0);
 214
 215                 cdv_intel_lvds_set_backlight(dev,
 216                                 dev_priv->mode_dev.backlight_duty_cycle);
 217         } else {
 218                 cdv_intel_lvds_set_backlight(dev, 0);
 219
 220                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 221                           ~POWER_TARGET_ON);
 222                 do {
 223                         pp_status = REG_READ(PP_STATUS);
 224                 } while (pp_status & PP_ON);
 225         }
 226         gma_power_end(dev);
 227 }
 228
 229 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 230 {
 231         struct drm_device *dev = encoder->dev;
 232         if (mode == DRM_MODE_DPMS_ON)
 233                 cdv_intel_lvds_set_power(dev, encoder, true);
 234         else
 235                 cdv_intel_lvds_set_power(dev, encoder, false);
 236         /* XXX: We never power down the LVDS pairs. */
 237 }
 238
 239 static void cdv_intel_lvds_save(struct drm_connector *connector)
 240 {
 241 }
 242
 243 static void cdv_intel_lvds_restore(struct drm_connector *connector)
 244 {
 245 }
 246
 247 static int cdv_intel_lvds_mode_valid(struct drm_connector *connector,
 248                               struct drm_display_mode *mode)
 249 {
 250         struct drm_device *dev = connector->dev;
 251         struct drm_psb_private *dev_priv = dev->dev_private;
 252         struct drm_display_mode *fixed_mode =
 253                                         dev_priv->mode_dev.panel_fixed_mode;
 254
 255         /* just in case */
 256         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 257                 return MODE_NO_DBLESCAN;
 258
 259         /* just in case */
 260         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 261                 return MODE_NO_INTERLACE;
 262
 263         if (fixed_mode) {
 264                 if (mode->hdisplay > fixed_mode->hdisplay)
 265                         return MODE_PANEL;
 266                 if (mode->vdisplay > fixed_mode->vdisplay)
 267                         return MODE_PANEL;
 268         }
 269         return MODE_OK;
 270 }
 271
 272 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 273                                   const struct drm_display_mode *mode,
 274                                   struct drm_display_mode *adjusted_mode)
 275 {
 276         struct drm_device *dev = encoder->dev;
 277         struct drm_psb_private *dev_priv = dev->dev_private;
 278         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 279         struct drm_encoder *tmp_encoder;
 280         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 281
 282         /* Should never happen!! */
 283         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 284                             head) {
 285                 if (tmp_encoder != encoder
 286                     && tmp_encoder->crtc == encoder->crtc) {
 287                         printk(KERN_ERR "Can't enable LVDS and another "
 288                                "encoder on the same pipe\n");
 289                         return false;
 290                 }
 291         }
 292
 293         /*
 294          * If we have timings from the BIOS for the panel, put them in
 295          * to the adjusted mode.  The CRTC will be set up for this mode,
 296          * with the panel scaling set up to source from the H/VDisplay
 297          * of the original mode.
 298          */
 299         if (panel_fixed_mode != NULL) {
 300                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 301                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 302                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 303                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 304                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 305                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 306                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 307                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 308                 adjusted_mode->clock = panel_fixed_mode->clock;
 309                 drm_mode_set_crtcinfo(adjusted_mode,
 310                                       CRTC_INTERLACE_HALVE_V);
 311         }
 312
 313         /*
 314          * XXX: It would be nice to support lower refresh rates on the
 315          * panels to reduce power consumption, and perhaps match the
 316          * user's requested refresh rate.
 317          */
 318
 319         return true;
 320 }
 321
 322 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder)
 323 {
 324         struct drm_device *dev = encoder->dev;
 325         struct drm_psb_private *dev_priv = dev->dev_private;
 326         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 327
 328         if (!gma_power_begin(dev, true))
 329                 return;
 330
 331         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 332         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 333                                           BACKLIGHT_DUTY_CYCLE_MASK);
 334
 335         cdv_intel_lvds_set_power(dev, encoder, false);
 336
 337         gma_power_end(dev);
 338 }
 339
 340 static void cdv_intel_lvds_commit(struct drm_encoder *encoder)
 341 {
 342         struct drm_device *dev = encoder->dev;
 343         struct drm_psb_private *dev_priv = dev->dev_private;
 344         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 345
 346         if (mode_dev->backlight_duty_cycle == 0)
 347                 mode_dev->backlight_duty_cycle =
 348                     cdv_intel_lvds_get_max_backlight(dev);
 349
 350         cdv_intel_lvds_set_power(dev, encoder, true);
 351 }
 352
 353 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder,
 354                                 struct drm_display_mode *mode,
 355                                 struct drm_display_mode *adjusted_mode)
 356 {
 357         struct drm_device *dev = encoder->dev;
 358         struct drm_psb_private *dev_priv = dev->dev_private;
 359         struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
 360         u32 pfit_control;
 361
 362         /*
 363          * The LVDS pin pair will already have been turned on in the
 364          * cdv_intel_crtc_mode_set since it has a large impact on the DPLL
 365          * settings.
 366          */
 367
 368         /*
 369          * Enable automatic panel scaling so that non-native modes fill the
 370          * screen.  Should be enabled before the pipe is enabled, according to
 371          * register description and PRM.
 372          */
 373         if (mode->hdisplay != adjusted_mode->hdisplay ||
 374             mode->vdisplay != adjusted_mode->vdisplay)
 375                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 376                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 377                                 HORIZ_INTERP_BILINEAR);
 378         else
 379                 pfit_control = 0;
 380
 381         pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT;
 382
 383         if (dev_priv->lvds_dither)
 384                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 385
 386         REG_WRITE(PFIT_CONTROL, pfit_control);
 387 }
 388
 389 /**
 390  * Detect the LVDS connection.
 391  *
 392  * This always returns CONNECTOR_STATUS_CONNECTED.
 393  * This connector should only have
 394  * been set up if the LVDS was actually connected anyway.
 395  */
 396 static enum drm_connector_status cdv_intel_lvds_detect(
 397                                 struct drm_connector *connector, bool force)
 398 {
 399         return connector_status_connected;
 400 }
 401
 402 /**
 403  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 404  */
 405 static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
 406 {
 407         struct drm_device *dev = connector->dev;
 408         struct drm_psb_private *dev_priv = dev->dev_private;
 409         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 410         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 411         int ret;
 412
 413         ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter);
 414
 415         if (ret)
 416                 return ret;
 417
 418         /* Didn't get an EDID, so
 419          * Set wide sync ranges so we get all modes
 420          * handed to valid_mode for checking
 421          */
 422         connector->display_info.min_vfreq = 0;
 423         connector->display_info.max_vfreq = 200;
 424         connector->display_info.min_hfreq = 0;
 425         connector->display_info.max_hfreq = 200;
 426         if (mode_dev->panel_fixed_mode != NULL) {
 427                 struct drm_display_mode *mode =
 428                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 429                 drm_mode_probed_add(connector, mode);
 430                 return 1;
 431         }
 432
 433         return 0;
 434 }
 435
 436 /**
 437  * cdv_intel_lvds_destroy - unregister and free LVDS structures
 438  * @connector: connector to free
 439  *
 440  * Unregister the DDC bus for this connector then free the driver private
 441  * structure.
 442  */
 443 static void cdv_intel_lvds_destroy(struct drm_connector *connector)
 444 {
 445         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 446
 447         if (gma_encoder->i2c_bus)
 448                 psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 449         drm_connector_unregister(connector);
 450         drm_connector_cleanup(connector);
 451         kfree(connector);
 452 }
 453
 454 static int cdv_intel_lvds_set_property(struct drm_connector *connector,
 455                                        struct drm_property *property,
 456                                        uint64_t value)
 457 {
 458         struct drm_encoder *encoder = connector->encoder;
 459
 460         if (!strcmp(property->name, "scaling mode") && encoder) {
 461                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 462                 uint64_t curValue;
 463
 464                 if (!crtc)
 465                         return -1;
 466
 467                 switch (value) {
 468                 case DRM_MODE_SCALE_FULLSCREEN:
 469                         break;
 470                 case DRM_MODE_SCALE_NO_SCALE:
 471                         break;
 472                 case DRM_MODE_SCALE_ASPECT:
 473                         break;
 474                 default:
 475                         return -1;
 476                 }
 477
 478                 if (drm_object_property_get_value(&connector->base,
 479                                                      property,
 480                                                      &curValue))
 481                         return -1;
 482
 483                 if (curValue == value)
 484                         return 0;
 485
 486                 if (drm_object_property_set_value(&connector->base,
 487                                                         property,
 488                                                         value))
 489                         return -1;
 490
 491                 if (crtc->saved_mode.hdisplay != 0 &&
 492                     crtc->saved_mode.vdisplay != 0) {
 493                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 494                                                       &crtc->saved_mode,
 495                                                       encoder->crtc->x,
 496                                                       encoder->crtc->y,
 497                                                       encoder->crtc->primary->fb))
 498                                 return -1;
 499                 }
 500         } else if (!strcmp(property->name, "backlight") && encoder) {
 501                 if (drm_object_property_set_value(&connector->base,
 502                                                         property,
 503                                                         value))
 504                         return -1;
 505                 else
 506                         gma_backlight_set(encoder->dev, value);
 507         } else if (!strcmp(property->name, "DPMS") && encoder) {
 508                 const struct drm_encoder_helper_funcs *helpers =
 509                                         encoder->helper_private;
 510                 helpers->dpms(encoder, value);
 511         }
 512         return 0;
 513 }
 514
 515 static const struct drm_encoder_helper_funcs
 516                                         cdv_intel_lvds_helper_funcs = {
 517         .dpms = cdv_intel_lvds_encoder_dpms,
 518         .mode_fixup = cdv_intel_lvds_mode_fixup,
 519         .prepare = cdv_intel_lvds_prepare,
 520         .mode_set = cdv_intel_lvds_mode_set,
 521         .commit = cdv_intel_lvds_commit,
 522 };
 523
 524 static const struct drm_connector_helper_funcs
 525                                 cdv_intel_lvds_connector_helper_funcs = {
 526         .get_modes = cdv_intel_lvds_get_modes,
 527         .mode_valid = cdv_intel_lvds_mode_valid,
 528         .best_encoder = gma_best_encoder,
 529 };
 530
 531 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = {
 532         .dpms = drm_helper_connector_dpms,
 533         .save = cdv_intel_lvds_save,
 534         .restore = cdv_intel_lvds_restore,
 535         .detect = cdv_intel_lvds_detect,
 536         .fill_modes = drm_helper_probe_single_connector_modes,
 537         .set_property = cdv_intel_lvds_set_property,
 538         .destroy = cdv_intel_lvds_destroy,
 539 };
 540
 541
 542 static void cdv_intel_lvds_enc_destroy(struct drm_encoder *encoder)
 543 {
 544         drm_encoder_cleanup(encoder);
 545 }
 546
 547 static const struct drm_encoder_funcs cdv_intel_lvds_enc_funcs = {
 548         .destroy = cdv_intel_lvds_enc_destroy,
 549 };
 550
 551 /*
 552  * Enumerate the child dev array parsed from VBT to check whether
 553  * the LVDS is present.
 554  * If it is present, return 1.
 555  * If it is not present, return false.
 556  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 557  */
 558 static bool lvds_is_present_in_vbt(struct drm_device *dev,
 559                                    u8 *i2c_pin)
 560 {
 561         struct drm_psb_private *dev_priv = dev->dev_private;
 562         int i;
 563
 564         if (!dev_priv->child_dev_num)
 565                 return true;
 566
 567         for (i = 0; i < dev_priv->child_dev_num; i++) {
 568                 struct child_device_config *child = dev_priv->child_dev + i;
 569
 570                 /* If the device type is not LFP, continue.
 571                  * We have to check both the new identifiers as well as the
 572                  * old for compatibility with some BIOSes.
 573                  */
 574                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
 575                     child->device_type != DEVICE_TYPE_LFP)
 576                         continue;
 577
 578                 if (child->i2c_pin)
 579                     *i2c_pin = child->i2c_pin;
 580
 581                 /* However, we cannot trust the BIOS writers to populate
 582                  * the VBT correctly.  Since LVDS requires additional
 583                  * information from AIM blocks, a non-zero addin offset is
 584                  * a good indicator that the LVDS is actually present.
 585                  */
 586                 if (child->addin_offset)
 587                         return true;
 588
 589                 /* But even then some BIOS writers perform some black magic
 590                  * and instantiate the device without reference to any
 591                  * additional data.  Trust that if the VBT was written into
 592                  * the OpRegion then they have validated the LVDS's existence.
 593                  */
 594                 if (dev_priv->opregion.vbt)
 595                         return true;
 596         }
 597
 598         return false;
 599 }
 600
 601 /**
 602  * cdv_intel_lvds_init - setup LVDS connectors on this device
 603  * @dev: drm device
 604  *
 605  * Create the connector, register the LVDS DDC bus, and try to figure out what
 606  * modes we can display on the LVDS panel (if present).
 607  */
 608 void cdv_intel_lvds_init(struct drm_device *dev,
 609                      struct psb_intel_mode_device *mode_dev)
 610 {
 611         struct gma_encoder *gma_encoder;
 612         struct gma_connector *gma_connector;
 613         struct cdv_intel_lvds_priv *lvds_priv;
 614         struct drm_connector *connector;
 615         struct drm_encoder *encoder;
 616         struct drm_display_mode *scan;
 617         struct drm_crtc *crtc;
 618         struct drm_psb_private *dev_priv = dev->dev_private;
 619         u32 lvds;
 620         int pipe;
 621         u8 pin;
 622
 623         pin = GMBUS_PORT_PANEL;
 624         if (!lvds_is_present_in_vbt(dev, &pin)) {
 625                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
 626                 return;
 627         }
 628
 629         gma_encoder = kzalloc(sizeof(struct gma_encoder),
 630                                     GFP_KERNEL);
 631         if (!gma_encoder)
 632                 return;
 633
 634         gma_connector = kzalloc(sizeof(struct gma_connector),
 635                                       GFP_KERNEL);
 636         if (!gma_connector)
 637                 goto failed_connector;
 638
 639         lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL);
 640         if (!lvds_priv)
 641                 goto failed_lvds_priv;
 642
 643         gma_encoder->dev_priv = lvds_priv;
 644
 645         connector = &gma_connector->base;
 646         encoder = &gma_encoder->base;
 647
 648
 649         drm_connector_init(dev, connector,
 650                            &cdv_intel_lvds_connector_funcs,
 651                            DRM_MODE_CONNECTOR_LVDS);
 652
 653         drm_encoder_init(dev, encoder,
 654                          &cdv_intel_lvds_enc_funcs,
 655                          DRM_MODE_ENCODER_LVDS);
 656
 657
 658         gma_connector_attach_encoder(gma_connector, gma_encoder);
 659         gma_encoder->type = INTEL_OUTPUT_LVDS;
 660
 661         drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs);
 662         drm_connector_helper_add(connector,
 663                                  &cdv_intel_lvds_connector_helper_funcs);
 664         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 665         connector->interlace_allowed = false;
 666         connector->doublescan_allowed = false;
 667
 668         /*Attach connector properties*/
 669         drm_object_attach_property(&connector->base,
 670                                       dev->mode_config.scaling_mode_property,
 671                                       DRM_MODE_SCALE_FULLSCREEN);
 672         drm_object_attach_property(&connector->base,
 673                                       dev_priv->backlight_property,
 674                                       BRIGHTNESS_MAX_LEVEL);
 675
 676         /**
 677          * Set up I2C bus
 678          * FIXME: distroy i2c_bus when exit
 679          */
 680         gma_encoder->i2c_bus = psb_intel_i2c_create(dev,
 681                                                          GPIOB,
 682                                                          "LVDSBLC_B");
 683         if (!gma_encoder->i2c_bus) {
 684                 dev_printk(KERN_ERR,
 685                         &dev->pdev->dev, "I2C bus registration failed.\n");
 686                 goto failed_blc_i2c;
 687         }
 688         gma_encoder->i2c_bus->slave_addr = 0x2C;
 689         dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus;
 690
 691         /*
 692          * LVDS discovery:
 693          * 1) check for EDID on DDC
 694          * 2) check for VBT data
 695          * 3) check to see if LVDS is already on
 696          *    if none of the above, no panel
 697          * 4) make sure lid is open
 698          *    if closed, act like it's not there for now
 699          */
 700
 701         /* Set up the DDC bus. */
 702         gma_encoder->ddc_bus = psb_intel_i2c_create(dev,
 703                                                          GPIOC,
 704                                                          "LVDSDDC_C");
 705         if (!gma_encoder->ddc_bus) {
 706                 dev_printk(KERN_ERR, &dev->pdev->dev,
 707                            "DDC bus registration " "failed.\n");
 708                 goto failed_ddc;
 709         }
 710
 711         /*
 712          * Attempt to get the fixed panel mode from DDC.  Assume that the
 713          * preferred mode is the right one.
 714          */
 715         mutex_lock(&dev->mode_config.mutex);
 716         psb_intel_ddc_get_modes(connector,
 717                                 &gma_encoder->ddc_bus->adapter);
 718         list_for_each_entry(scan, &connector->probed_modes, head) {
 719                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 720                         mode_dev->panel_fixed_mode =
 721                             drm_mode_duplicate(dev, scan);
 722                         goto out;       /* FIXME: check for quirks */
 723                 }
 724         }
 725
 726         /* Failed to get EDID, what about VBT? do we need this?*/
 727         if (dev_priv->lfp_lvds_vbt_mode) {
 728                 mode_dev->panel_fixed_mode =
 729                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 730                 if (mode_dev->panel_fixed_mode) {
 731                         mode_dev->panel_fixed_mode->type |=
 732                                 DRM_MODE_TYPE_PREFERRED;
 733                         goto out;       /* FIXME: check for quirks */
 734                 }
 735         }
 736         /*
 737          * If we didn't get EDID, try checking if the panel is already turned
 738          * on.  If so, assume that whatever is currently programmed is the
 739          * correct mode.
 740          */
 741         lvds = REG_READ(LVDS);
 742         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 743         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 744
 745         if (crtc && (lvds & LVDS_PORT_EN)) {
 746                 mode_dev->panel_fixed_mode =
 747                     cdv_intel_crtc_mode_get(dev, crtc);
 748                 if (mode_dev->panel_fixed_mode) {
 749                         mode_dev->panel_fixed_mode->type |=
 750                             DRM_MODE_TYPE_PREFERRED;
 751                         goto out;       /* FIXME: check for quirks */
 752                 }
 753         }
 754
 755         /* If we still don't have a mode after all that, give up. */
 756         if (!mode_dev->panel_fixed_mode) {
 757                 DRM_DEBUG
 758                         ("Found no modes on the lvds, ignoring the LVDS\n");
 759                 goto failed_find;
 760         }
 761
 762         /* setup PWM */
 763         {
 764                 u32 pwm;
 765
 766                 pwm = REG_READ(BLC_PWM_CTL2);
 767                 if (pipe == 1)
 768                         pwm |= PWM_PIPE_B;
 769                 else
 770                         pwm &= ~PWM_PIPE_B;
 771                 pwm |= PWM_ENABLE;
 772                 REG_WRITE(BLC_PWM_CTL2, pwm);
 773         }
 774
 775 out:
 776         mutex_unlock(&dev->mode_config.mutex);
 777         drm_connector_register(connector);
 778         return;
 779
 780 failed_find:
 781         mutex_unlock(&dev->mode_config.mutex);
 782         printk(KERN_ERR "Failed find\n");
 783         if (gma_encoder->ddc_bus)
 784                 psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 785 failed_ddc:
 786         printk(KERN_ERR "Failed DDC\n");
 787         if (gma_encoder->i2c_bus)
 788                 psb_intel_i2c_destroy(gma_encoder->i2c_bus);
 789 failed_blc_i2c:
 790         printk(KERN_ERR "Failed BLC\n");
 791         drm_encoder_cleanup(encoder);
 792         drm_connector_cleanup(connector);
 793         kfree(lvds_priv);
 794 failed_lvds_priv:
 795         kfree(gma_connector);
 796 failed_connector:
 797         kfree(gma_encoder);
 798 }