drivers/gpu/drm/gma500/psb_intel_lvds.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright © 2006-2007 Intel Corporation
   4  *
   5  * Authors:
   6  *      Eric Anholt <eric@anholt.net>
   7  *      Dave Airlie <airlied@linux.ie>
   8  *      Jesse Barnes <jesse.barnes@intel.com>
   9  */
  10
  11 #include <linux/i2c.h>
  12 #include <linux/pm_runtime.h>
  13
  14 #include <drm/drm_simple_kms_helper.h>
  15
  16 #include "intel_bios.h"
  17 #include "power.h"
  18 #include "psb_drv.h"
  19 #include "psb_intel_drv.h"
  20 #include "psb_intel_reg.h"
  21
  22 /*
  23  * LVDS I2C backlight control macros
  24  */
  25 #define BRIGHTNESS_MAX_LEVEL 100
  26 #define BRIGHTNESS_MASK 0xFF
  27 #define BLC_I2C_TYPE    0x01
  28 #define BLC_PWM_TYPT    0x02
  29
  30 #define BLC_POLARITY_NORMAL 0
  31 #define BLC_POLARITY_INVERSE 1
  32
  33 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
  34 #define PSB_BLC_MIN_PWM_REG_FREQ        (0x2)
  35 #define PSB_BLC_PWM_PRECISION_FACTOR    (10)
  36 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  37 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  38
  39 struct psb_intel_lvds_priv {
  40         /*
  41          * Saved LVDO output states
  42          */
  43         uint32_t savePP_ON;
  44         uint32_t savePP_OFF;
  45         uint32_t saveLVDS;
  46         uint32_t savePP_CONTROL;
  47         uint32_t savePP_CYCLE;
  48         uint32_t savePFIT_CONTROL;
  49         uint32_t savePFIT_PGM_RATIOS;
  50         uint32_t saveBLC_PWM_CTL;
  51
  52         struct gma_i2c_chan *i2c_bus;
  53 };
  54
  55
  56 /*
  57  * Returns the maximum level of the backlight duty cycle field.
  58  */
  59 static u32 psb_intel_lvds_get_max_backlight(struct drm_device *dev)
  60 {
  61         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
  62         u32 ret;
  63
  64         if (gma_power_begin(dev, false)) {
  65                 ret = REG_READ(BLC_PWM_CTL);
  66                 gma_power_end(dev);
  67         } else /* Powered off, use the saved value */
  68                 ret = dev_priv->regs.saveBLC_PWM_CTL;
  69
  70         /* Top 15bits hold the frequency mask */
  71         ret = (ret &  BACKLIGHT_MODULATION_FREQ_MASK) >>
  72                                         BACKLIGHT_MODULATION_FREQ_SHIFT;
  73
  74         ret *= 2;       /* Return a 16bit range as needed for setting */
  75         if (ret == 0)
  76                 dev_err(dev->dev, "BL bug: Reg %08x save %08X\n",
  77                         REG_READ(BLC_PWM_CTL), dev_priv->regs.saveBLC_PWM_CTL);
  78         return ret;
  79 }
  80
  81 /*
  82  * Set LVDS backlight level by I2C command
  83  *
  84  * FIXME: at some point we need to both track this for PM and also
  85  * disable runtime pm on MRST if the brightness is nil (ie blanked)
  86  */
  87 static int psb_lvds_i2c_set_brightness(struct drm_device *dev,
  88                                         unsigned int level)
  89 {
  90         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
  91
  92         struct gma_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus;
  93         u8 out_buf[2];
  94         unsigned int blc_i2c_brightness;
  95
  96         struct i2c_msg msgs[] = {
  97                 {
  98                         .addr = lvds_i2c_bus->slave_addr,
  99                         .flags = 0,
 100                         .len = 2,
 101                         .buf = out_buf,
 102                 }
 103         };
 104
 105         blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level *
 106                              BRIGHTNESS_MASK /
 107                              BRIGHTNESS_MAX_LEVEL);
 108
 109         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 110                 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness;
 111
 112         out_buf[0] = dev_priv->lvds_bl->brightnesscmd;
 113         out_buf[1] = (u8)blc_i2c_brightness;
 114
 115         if (i2c_transfer(&lvds_i2c_bus->base, msgs, 1) == 1) {
 116                 dev_dbg(dev->dev, "I2C set brightness.(command, value) (%d, %d)\n",
 117                         dev_priv->lvds_bl->brightnesscmd,
 118                         blc_i2c_brightness);
 119                 return 0;
 120         }
 121
 122         dev_err(dev->dev, "I2C transfer error\n");
 123         return -1;
 124 }
 125
 126
 127 static int psb_lvds_pwm_set_brightness(struct drm_device *dev, int level)
 128 {
 129         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 130
 131         u32 max_pwm_blc;
 132         u32 blc_pwm_duty_cycle;
 133
 134         max_pwm_blc = psb_intel_lvds_get_max_backlight(dev);
 135
 136         /*BLC_PWM_CTL Should be initiated while backlight device init*/
 137         BUG_ON(max_pwm_blc == 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         dev_info(dev->dev, "Backlight lvds set brightness %08x\n",
 150                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 151                   (blc_pwm_duty_cycle));
 152
 153         return 0;
 154 }
 155
 156 /*
 157  * Set LVDS backlight level either by I2C or PWM
 158  */
 159 void psb_intel_lvds_set_brightness(struct drm_device *dev, int level)
 160 {
 161         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 162
 163         dev_dbg(dev->dev, "backlight level is %d\n", level);
 164
 165         if (!dev_priv->lvds_bl) {
 166                 dev_err(dev->dev, "NO LVDS backlight info\n");
 167                 return;
 168         }
 169
 170         if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
 171                 psb_lvds_i2c_set_brightness(dev, level);
 172         else
 173                 psb_lvds_pwm_set_brightness(dev, level);
 174 }
 175
 176 /*
 177  * Sets the backlight level.
 178  *
 179  * level: backlight level, from 0 to psb_intel_lvds_get_max_backlight().
 180  */
 181 static void psb_intel_lvds_set_backlight(struct drm_device *dev, int level)
 182 {
 183         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 184         u32 blc_pwm_ctl;
 185
 186         if (gma_power_begin(dev, false)) {
 187                 blc_pwm_ctl = REG_READ(BLC_PWM_CTL);
 188                 blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 189                 REG_WRITE(BLC_PWM_CTL,
 190                                 (blc_pwm_ctl |
 191                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 192                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 193                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 194                 gma_power_end(dev);
 195         } else {
 196                 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
 197                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 198                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 199                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 200         }
 201 }
 202
 203 /*
 204  * Sets the power state for the panel.
 205  */
 206 static void psb_intel_lvds_set_power(struct drm_device *dev, bool on)
 207 {
 208         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 209         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 210         u32 pp_status;
 211
 212         if (!gma_power_begin(dev, true)) {
 213                 dev_err(dev->dev, "set power, chip off!\n");
 214                 return;
 215         }
 216
 217         if (on) {
 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) == 0);
 223
 224                 psb_intel_lvds_set_backlight(dev,
 225                                              mode_dev->backlight_duty_cycle);
 226         } else {
 227                 psb_intel_lvds_set_backlight(dev, 0);
 228
 229                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 230                           ~POWER_TARGET_ON);
 231                 do {
 232                         pp_status = REG_READ(PP_STATUS);
 233                 } while (pp_status & PP_ON);
 234         }
 235
 236         gma_power_end(dev);
 237 }
 238
 239 static void psb_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 240 {
 241         struct drm_device *dev = encoder->dev;
 242
 243         if (mode == DRM_MODE_DPMS_ON)
 244                 psb_intel_lvds_set_power(dev, true);
 245         else
 246                 psb_intel_lvds_set_power(dev, false);
 247
 248         /* XXX: We never power down the LVDS pairs. */
 249 }
 250
 251 static void psb_intel_lvds_save(struct drm_connector *connector)
 252 {
 253         struct drm_device *dev = connector->dev;
 254         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 255         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 256         struct psb_intel_lvds_priv *lvds_priv =
 257                 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
 258
 259         lvds_priv->savePP_ON = REG_READ(LVDSPP_ON);
 260         lvds_priv->savePP_OFF = REG_READ(LVDSPP_OFF);
 261         lvds_priv->saveLVDS = REG_READ(LVDS);
 262         lvds_priv->savePP_CONTROL = REG_READ(PP_CONTROL);
 263         lvds_priv->savePP_CYCLE = REG_READ(PP_CYCLE);
 264         /*lvds_priv->savePP_DIVISOR = REG_READ(PP_DIVISOR);*/
 265         lvds_priv->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 266         lvds_priv->savePFIT_CONTROL = REG_READ(PFIT_CONTROL);
 267         lvds_priv->savePFIT_PGM_RATIOS = REG_READ(PFIT_PGM_RATIOS);
 268
 269         /*TODO: move backlight_duty_cycle to psb_intel_lvds_priv*/
 270         dev_priv->backlight_duty_cycle = (dev_priv->regs.saveBLC_PWM_CTL &
 271                                                 BACKLIGHT_DUTY_CYCLE_MASK);
 272
 273         /*
 274          * If the light is off at server startup,
 275          * just make it full brightness
 276          */
 277         if (dev_priv->backlight_duty_cycle == 0)
 278                 dev_priv->backlight_duty_cycle =
 279                 psb_intel_lvds_get_max_backlight(dev);
 280
 281         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 282                         lvds_priv->savePP_ON,
 283                         lvds_priv->savePP_OFF,
 284                         lvds_priv->saveLVDS,
 285                         lvds_priv->savePP_CONTROL,
 286                         lvds_priv->savePP_CYCLE,
 287                         lvds_priv->saveBLC_PWM_CTL);
 288 }
 289
 290 static void psb_intel_lvds_restore(struct drm_connector *connector)
 291 {
 292         struct drm_device *dev = connector->dev;
 293         u32 pp_status;
 294         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 295         struct psb_intel_lvds_priv *lvds_priv =
 296                 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
 297
 298         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 299                         lvds_priv->savePP_ON,
 300                         lvds_priv->savePP_OFF,
 301                         lvds_priv->saveLVDS,
 302                         lvds_priv->savePP_CONTROL,
 303                         lvds_priv->savePP_CYCLE,
 304                         lvds_priv->saveBLC_PWM_CTL);
 305
 306         REG_WRITE(BLC_PWM_CTL, lvds_priv->saveBLC_PWM_CTL);
 307         REG_WRITE(PFIT_CONTROL, lvds_priv->savePFIT_CONTROL);
 308         REG_WRITE(PFIT_PGM_RATIOS, lvds_priv->savePFIT_PGM_RATIOS);
 309         REG_WRITE(LVDSPP_ON, lvds_priv->savePP_ON);
 310         REG_WRITE(LVDSPP_OFF, lvds_priv->savePP_OFF);
 311         /*REG_WRITE(PP_DIVISOR, lvds_priv->savePP_DIVISOR);*/
 312         REG_WRITE(PP_CYCLE, lvds_priv->savePP_CYCLE);
 313         REG_WRITE(PP_CONTROL, lvds_priv->savePP_CONTROL);
 314         REG_WRITE(LVDS, lvds_priv->saveLVDS);
 315
 316         if (lvds_priv->savePP_CONTROL & POWER_TARGET_ON) {
 317                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 318                         POWER_TARGET_ON);
 319                 do {
 320                         pp_status = REG_READ(PP_STATUS);
 321                 } while ((pp_status & PP_ON) == 0);
 322         } else {
 323                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 324                         ~POWER_TARGET_ON);
 325                 do {
 326                         pp_status = REG_READ(PP_STATUS);
 327                 } while (pp_status & PP_ON);
 328         }
 329 }
 330
 331 enum drm_mode_status psb_intel_lvds_mode_valid(struct drm_connector *connector,
 332                                  struct drm_display_mode *mode)
 333 {
 334         struct drm_psb_private *dev_priv = to_drm_psb_private(connector->dev);
 335         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 336         struct drm_display_mode *fixed_mode =
 337                                         dev_priv->mode_dev.panel_fixed_mode;
 338
 339         if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
 340                 fixed_mode = dev_priv->mode_dev.panel_fixed_mode2;
 341
 342         /* just in case */
 343         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 344                 return MODE_NO_DBLESCAN;
 345
 346         /* just in case */
 347         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 348                 return MODE_NO_INTERLACE;
 349
 350         if (fixed_mode) {
 351                 if (mode->hdisplay > fixed_mode->hdisplay)
 352                         return MODE_PANEL;
 353                 if (mode->vdisplay > fixed_mode->vdisplay)
 354                         return MODE_PANEL;
 355         }
 356         return MODE_OK;
 357 }
 358
 359 bool psb_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 360                                   const struct drm_display_mode *mode,
 361                                   struct drm_display_mode *adjusted_mode)
 362 {
 363         struct drm_device *dev = encoder->dev;
 364         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 365         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 366         struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
 367         struct drm_encoder *tmp_encoder;
 368         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 369         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 370
 371         if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
 372                 panel_fixed_mode = mode_dev->panel_fixed_mode2;
 373
 374         /* PSB requires the LVDS is on pipe B, MRST has only one pipe anyway */
 375         if (!IS_MRST(dev) && gma_crtc->pipe == 0) {
 376                 pr_err("Can't support LVDS on pipe A\n");
 377                 return false;
 378         }
 379         if (IS_MRST(dev) && gma_crtc->pipe != 0) {
 380                 pr_err("Must use PIPE A\n");
 381                 return false;
 382         }
 383         /* Should never happen!! */
 384         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 385                             head) {
 386                 if (tmp_encoder != encoder
 387                     && tmp_encoder->crtc == encoder->crtc) {
 388                         pr_err("Can't enable LVDS and another encoder on the same pipe\n");
 389                         return false;
 390                 }
 391         }
 392
 393         /*
 394          * If we have timings from the BIOS for the panel, put them in
 395          * to the adjusted mode.  The CRTC will be set up for this mode,
 396          * with the panel scaling set up to source from the H/VDisplay
 397          * of the original mode.
 398          */
 399         if (panel_fixed_mode != NULL) {
 400                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 401                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 402                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 403                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 404                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 405                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 406                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 407                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 408                 adjusted_mode->clock = panel_fixed_mode->clock;
 409                 drm_mode_set_crtcinfo(adjusted_mode,
 410                                       CRTC_INTERLACE_HALVE_V);
 411         }
 412
 413         /*
 414          * XXX: It would be nice to support lower refresh rates on the
 415          * panels to reduce power consumption, and perhaps match the
 416          * user's requested refresh rate.
 417          */
 418
 419         return true;
 420 }
 421
 422 static void psb_intel_lvds_prepare(struct drm_encoder *encoder)
 423 {
 424         struct drm_device *dev = encoder->dev;
 425         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 426         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 427
 428         if (!gma_power_begin(dev, true))
 429                 return;
 430
 431         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 432         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 433                                           BACKLIGHT_DUTY_CYCLE_MASK);
 434
 435         psb_intel_lvds_set_power(dev, false);
 436
 437         gma_power_end(dev);
 438 }
 439
 440 static void psb_intel_lvds_commit(struct drm_encoder *encoder)
 441 {
 442         struct drm_device *dev = encoder->dev;
 443         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 444         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 445
 446         if (mode_dev->backlight_duty_cycle == 0)
 447                 mode_dev->backlight_duty_cycle =
 448                     psb_intel_lvds_get_max_backlight(dev);
 449
 450         psb_intel_lvds_set_power(dev, true);
 451 }
 452
 453 static void psb_intel_lvds_mode_set(struct drm_encoder *encoder,
 454                                 struct drm_display_mode *mode,
 455                                 struct drm_display_mode *adjusted_mode)
 456 {
 457         struct drm_device *dev = encoder->dev;
 458         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 459         u32 pfit_control;
 460
 461         /*
 462          * The LVDS pin pair will already have been turned on in the
 463          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 464          * settings.
 465          */
 466
 467         /*
 468          * Enable automatic panel scaling so that non-native modes fill the
 469          * screen.  Should be enabled before the pipe is enabled, according to
 470          * register description and PRM.
 471          */
 472         if (mode->hdisplay != adjusted_mode->hdisplay ||
 473             mode->vdisplay != adjusted_mode->vdisplay)
 474                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 475                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 476                                 HORIZ_INTERP_BILINEAR);
 477         else
 478                 pfit_control = 0;
 479
 480         if (dev_priv->lvds_dither)
 481                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 482
 483         REG_WRITE(PFIT_CONTROL, pfit_control);
 484 }
 485
 486 /*
 487  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 488  */
 489 static int psb_intel_lvds_get_modes(struct drm_connector *connector)
 490 {
 491         struct drm_device *dev = connector->dev;
 492         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 493         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 494         int ret = 0;
 495
 496         if (!IS_MRST(dev))
 497                 ret = psb_intel_ddc_get_modes(connector, connector->ddc);
 498
 499         if (ret)
 500                 return ret;
 501
 502         if (mode_dev->panel_fixed_mode != NULL) {
 503                 struct drm_display_mode *mode =
 504                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 505                 drm_mode_probed_add(connector, mode);
 506                 return 1;
 507         }
 508
 509         return 0;
 510 }
 511
 512 void psb_intel_lvds_destroy(struct drm_connector *connector)
 513 {
 514         struct gma_connector *gma_connector = to_gma_connector(connector);
 515         struct gma_i2c_chan *ddc_bus = to_gma_i2c_chan(connector->ddc);
 516
 517         gma_i2c_destroy(ddc_bus);
 518         drm_connector_cleanup(connector);
 519         kfree(gma_connector);
 520 }
 521
 522 int psb_intel_lvds_set_property(struct drm_connector *connector,
 523                                        struct drm_property *property,
 524                                        uint64_t value)
 525 {
 526         struct drm_encoder *encoder = connector->encoder;
 527
 528         if (!encoder)
 529                 return -1;
 530
 531         if (!strcmp(property->name, "scaling mode")) {
 532                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 533                 uint64_t curval;
 534
 535                 if (!crtc)
 536                         goto set_prop_error;
 537
 538                 switch (value) {
 539                 case DRM_MODE_SCALE_FULLSCREEN:
 540                         break;
 541                 case DRM_MODE_SCALE_NO_SCALE:
 542                         break;
 543                 case DRM_MODE_SCALE_ASPECT:
 544                         break;
 545                 default:
 546                         goto set_prop_error;
 547                 }
 548
 549                 if (drm_object_property_get_value(&connector->base,
 550                                                      property,
 551                                                      &curval))
 552                         goto set_prop_error;
 553
 554                 if (curval == value)
 555                         goto set_prop_done;
 556
 557                 if (drm_object_property_set_value(&connector->base,
 558                                                         property,
 559                                                         value))
 560                         goto set_prop_error;
 561
 562                 if (crtc->saved_mode.hdisplay != 0 &&
 563                     crtc->saved_mode.vdisplay != 0) {
 564                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 565                                                       &crtc->saved_mode,
 566                                                       encoder->crtc->x,
 567                                                       encoder->crtc->y,
 568                                                       encoder->crtc->primary->fb))
 569                                 goto set_prop_error;
 570                 }
 571         } else if (!strcmp(property->name, "backlight")) {
 572                 if (drm_object_property_set_value(&connector->base,
 573                                                         property,
 574                                                         value))
 575                         goto set_prop_error;
 576                 else
 577                         gma_backlight_set(encoder->dev, value);
 578         } else if (!strcmp(property->name, "DPMS")) {
 579                 const struct drm_encoder_helper_funcs *hfuncs
 580                                                 = encoder->helper_private;
 581                 hfuncs->dpms(encoder, value);
 582         }
 583
 584 set_prop_done:
 585         return 0;
 586 set_prop_error:
 587         return -1;
 588 }
 589
 590 static const struct drm_encoder_helper_funcs psb_intel_lvds_helper_funcs = {
 591         .dpms = psb_intel_lvds_encoder_dpms,
 592         .mode_fixup = psb_intel_lvds_mode_fixup,
 593         .prepare = psb_intel_lvds_prepare,
 594         .mode_set = psb_intel_lvds_mode_set,
 595         .commit = psb_intel_lvds_commit,
 596 };
 597
 598 const struct drm_connector_helper_funcs
 599                                 psb_intel_lvds_connector_helper_funcs = {
 600         .get_modes = psb_intel_lvds_get_modes,
 601         .mode_valid = psb_intel_lvds_mode_valid,
 602         .best_encoder = gma_best_encoder,
 603 };
 604
 605 const struct drm_connector_funcs psb_intel_lvds_connector_funcs = {
 606         .dpms = drm_helper_connector_dpms,
 607         .fill_modes = drm_helper_probe_single_connector_modes,
 608         .set_property = psb_intel_lvds_set_property,
 609         .destroy = psb_intel_lvds_destroy,
 610 };
 611
 612 /**
 613  * psb_intel_lvds_init - setup LVDS connectors on this device
 614  * @dev: drm device
 615  * @mode_dev: mode device
 616  *
 617  * Create the connector, register the LVDS DDC bus, and try to figure out what
 618  * modes we can display on the LVDS panel (if present).
 619  */
 620 void psb_intel_lvds_init(struct drm_device *dev,
 621                          struct psb_intel_mode_device *mode_dev)
 622 {
 623         struct gma_encoder *gma_encoder;
 624         struct gma_connector *gma_connector;
 625         struct psb_intel_lvds_priv *lvds_priv;
 626         struct drm_connector *connector;
 627         struct drm_encoder *encoder;
 628         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 629         struct drm_crtc *crtc;
 630         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 631         struct gma_i2c_chan *ddc_bus;
 632         u32 lvds;
 633         int pipe;
 634         int ret;
 635
 636         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 637         if (!gma_encoder) {
 638                 dev_err(dev->dev, "gma_encoder allocation error\n");
 639                 return;
 640         }
 641         encoder = &gma_encoder->base;
 642
 643         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 644         if (!gma_connector) {
 645                 dev_err(dev->dev, "gma_connector allocation error\n");
 646                 goto err_free_encoder;
 647         }
 648
 649         lvds_priv = kzalloc(sizeof(struct psb_intel_lvds_priv), GFP_KERNEL);
 650         if (!lvds_priv) {
 651                 dev_err(dev->dev, "LVDS private allocation error\n");
 652                 goto err_free_connector;
 653         }
 654
 655         gma_encoder->dev_priv = lvds_priv;
 656
 657         connector = &gma_connector->base;
 658         gma_connector->save = psb_intel_lvds_save;
 659         gma_connector->restore = psb_intel_lvds_restore;
 660
 661         /* Set up the DDC bus. */
 662         ddc_bus = gma_i2c_create(dev, GPIOC, "LVDSDDC_C");
 663         if (!ddc_bus) {
 664                 dev_printk(KERN_ERR, dev->dev,
 665                            "DDC bus registration " "failed.\n");
 666                 goto err_free_lvds_priv;
 667         }
 668
 669         ret = drm_connector_init_with_ddc(dev, connector,
 670                                           &psb_intel_lvds_connector_funcs,
 671                                           DRM_MODE_CONNECTOR_LVDS,
 672                                           &ddc_bus->base);
 673         if (ret)
 674                 goto err_ddc_destroy;
 675
 676         ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 677         if (ret)
 678                 goto err_connector_cleanup;
 679
 680         gma_connector_attach_encoder(gma_connector, gma_encoder);
 681         gma_encoder->type = INTEL_OUTPUT_LVDS;
 682
 683         drm_encoder_helper_add(encoder, &psb_intel_lvds_helper_funcs);
 684         drm_connector_helper_add(connector,
 685                                  &psb_intel_lvds_connector_helper_funcs);
 686         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 687         connector->interlace_allowed = false;
 688         connector->doublescan_allowed = false;
 689
 690         /*Attach connector properties*/
 691         drm_object_attach_property(&connector->base,
 692                                       dev->mode_config.scaling_mode_property,
 693                                       DRM_MODE_SCALE_FULLSCREEN);
 694         drm_object_attach_property(&connector->base,
 695                                       dev_priv->backlight_property,
 696                                       BRIGHTNESS_MAX_LEVEL);
 697
 698         /*
 699          * Set up I2C bus
 700          * FIXME: distroy i2c_bus when exit
 701          */
 702         lvds_priv->i2c_bus = gma_i2c_create(dev, GPIOB, "LVDSBLC_B");
 703         if (!lvds_priv->i2c_bus) {
 704                 dev_printk(KERN_ERR,
 705                         dev->dev, "I2C bus registration failed.\n");
 706                 goto err_encoder_cleanup;
 707         }
 708         lvds_priv->i2c_bus->slave_addr = 0x2C;
 709         dev_priv->lvds_i2c_bus =  lvds_priv->i2c_bus;
 710
 711         /*
 712          * LVDS discovery:
 713          * 1) check for EDID on DDC
 714          * 2) check for VBT data
 715          * 3) check to see if LVDS is already on
 716          *    if none of the above, no panel
 717          * 4) make sure lid is open
 718          *    if closed, act like it's not there for now
 719          */
 720
 721         /*
 722          * Attempt to get the fixed panel mode from DDC.  Assume that the
 723          * preferred mode is the right one.
 724          */
 725         mutex_lock(&dev->mode_config.mutex);
 726         psb_intel_ddc_get_modes(connector, &ddc_bus->base);
 727
 728         list_for_each_entry(scan, &connector->probed_modes, head) {
 729                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 730                         mode_dev->panel_fixed_mode =
 731                             drm_mode_duplicate(dev, scan);
 732                         DRM_DEBUG_KMS("Using mode from DDC\n");
 733                         goto out;       /* FIXME: check for quirks */
 734                 }
 735         }
 736
 737         /* Failed to get EDID, what about VBT? do we need this? */
 738         if (dev_priv->lfp_lvds_vbt_mode) {
 739                 mode_dev->panel_fixed_mode =
 740                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 741
 742                 if (mode_dev->panel_fixed_mode) {
 743                         mode_dev->panel_fixed_mode->type |=
 744                                 DRM_MODE_TYPE_PREFERRED;
 745                         DRM_DEBUG_KMS("Using mode from VBT\n");
 746                         goto out;
 747                 }
 748         }
 749
 750         /*
 751          * If we didn't get EDID, try checking if the panel is already turned
 752          * on.  If so, assume that whatever is currently programmed is the
 753          * correct mode.
 754          */
 755         lvds = REG_READ(LVDS);
 756         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 757         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 758
 759         if (crtc && (lvds & LVDS_PORT_EN)) {
 760                 mode_dev->panel_fixed_mode =
 761                     psb_intel_crtc_mode_get(dev, crtc);
 762                 if (mode_dev->panel_fixed_mode) {
 763                         mode_dev->panel_fixed_mode->type |=
 764                             DRM_MODE_TYPE_PREFERRED;
 765                         DRM_DEBUG_KMS("Using pre-programmed mode\n");
 766                         goto out;       /* FIXME: check for quirks */
 767                 }
 768         }
 769
 770         /* If we still don't have a mode after all that, give up. */
 771         if (!mode_dev->panel_fixed_mode) {
 772                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 773                 goto err_unlock;
 774         }
 775
 776         /*
 777          * Blacklist machines with BIOSes that list an LVDS panel without
 778          * actually having one.
 779          */
 780 out:
 781         mutex_unlock(&dev->mode_config.mutex);
 782         return;
 783
 784 err_unlock:
 785         mutex_unlock(&dev->mode_config.mutex);
 786         gma_i2c_destroy(lvds_priv->i2c_bus);
 787 err_encoder_cleanup:
 788         drm_encoder_cleanup(encoder);
 789 err_connector_cleanup:
 790         drm_connector_cleanup(connector);
 791 err_ddc_destroy:
 792         gma_i2c_destroy(ddc_bus);
 793 err_free_lvds_priv:
 794         kfree(lvds_priv);
 795 err_free_connector:
 796         kfree(gma_connector);
 797 err_free_encoder:
 798         kfree(gma_encoder);
 799 }
 800