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 "intel_bios.h"
  15 #include "power.h"
  16 #include "psb_drv.h"
  17 #include "psb_intel_drv.h"
  18 #include "psb_intel_reg.h"
  19
  20 /*
  21  * LVDS I2C backlight control macros
  22  */
  23 #define BRIGHTNESS_MAX_LEVEL 100
  24 #define BRIGHTNESS_MASK 0xFF
  25 #define BLC_I2C_TYPE    0x01
  26 #define BLC_PWM_TYPT    0x02
  27
  28 #define BLC_POLARITY_NORMAL 0
  29 #define BLC_POLARITY_INVERSE 1
  30
  31 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
  32 #define PSB_BLC_MIN_PWM_REG_FREQ        (0x2)
  33 #define PSB_BLC_PWM_PRECISION_FACTOR    (10)
  34 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  35 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  36
  37 struct psb_intel_lvds_priv {
  38         /*
  39          * Saved LVDO output states
  40          */
  41         uint32_t savePP_ON;
  42         uint32_t savePP_OFF;
  43         uint32_t saveLVDS;
  44         uint32_t savePP_CONTROL;
  45         uint32_t savePP_CYCLE;
  46         uint32_t savePFIT_CONTROL;
  47         uint32_t savePFIT_PGM_RATIOS;
  48         uint32_t saveBLC_PWM_CTL;
  49
  50         struct psb_intel_i2c_chan *i2c_bus;
  51         struct psb_intel_i2c_chan *ddc_bus;
  52 };
  53
  54
  55 /*
  56  * Returns the maximum level of the backlight duty cycle field.
  57  */
  58 static u32 psb_intel_lvds_get_max_backlight(struct drm_device *dev)
  59 {
  60         struct drm_psb_private *dev_priv = dev->dev_private;
  61         u32 ret;
  62
  63         if (gma_power_begin(dev, false)) {
  64                 ret = REG_READ(BLC_PWM_CTL);
  65                 gma_power_end(dev);
  66         } else /* Powered off, use the saved value */
  67                 ret = dev_priv->regs.saveBLC_PWM_CTL;
  68
  69         /* Top 15bits hold the frequency mask */
  70         ret = (ret &  BACKLIGHT_MODULATION_FREQ_MASK) >>
  71                                         BACKLIGHT_MODULATION_FREQ_SHIFT;
  72
  73         ret *= 2;       /* Return a 16bit range as needed for setting */
  74         if (ret == 0)
  75                 dev_err(dev->dev, "BL bug: Reg %08x save %08X\n",
  76                         REG_READ(BLC_PWM_CTL), dev_priv->regs.saveBLC_PWM_CTL);
  77         return ret;
  78 }
  79
  80 /*
  81  * Set LVDS backlight level by I2C command
  82  *
  83  * FIXME: at some point we need to both track this for PM and also
  84  * disable runtime pm on MRST if the brightness is nil (ie blanked)
  85  */
  86 static int psb_lvds_i2c_set_brightness(struct drm_device *dev,
  87                                         unsigned int level)
  88 {
  89         struct drm_psb_private *dev_priv =
  90                 (struct drm_psb_private *)dev->dev_private;
  91
  92         struct psb_intel_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->adapter, 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 =
 130                         (struct drm_psb_private *)dev->dev_private;
 131
 132         u32 max_pwm_blc;
 133         u32 blc_pwm_duty_cycle;
 134
 135         max_pwm_blc = psb_intel_lvds_get_max_backlight(dev);
 136
 137         /*BLC_PWM_CTL Should be initiated while backlight device init*/
 138         BUG_ON(max_pwm_blc == 0);
 139
 140         blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
 141
 142         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 143                 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle;
 144
 145         blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
 146         REG_WRITE(BLC_PWM_CTL,
 147                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 148                   (blc_pwm_duty_cycle));
 149
 150         dev_info(dev->dev, "Backlight lvds set brightness %08x\n",
 151                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 152                   (blc_pwm_duty_cycle));
 153
 154         return 0;
 155 }
 156
 157 /*
 158  * Set LVDS backlight level either by I2C or PWM
 159  */
 160 void psb_intel_lvds_set_brightness(struct drm_device *dev, int level)
 161 {
 162         struct drm_psb_private *dev_priv = dev->dev_private;
 163
 164         dev_dbg(dev->dev, "backlight level is %d\n", level);
 165
 166         if (!dev_priv->lvds_bl) {
 167                 dev_err(dev->dev, "NO LVDS backlight info\n");
 168                 return;
 169         }
 170
 171         if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
 172                 psb_lvds_i2c_set_brightness(dev, level);
 173         else
 174                 psb_lvds_pwm_set_brightness(dev, level);
 175 }
 176
 177 /*
 178  * Sets the backlight level.
 179  *
 180  * level: backlight level, from 0 to psb_intel_lvds_get_max_backlight().
 181  */
 182 static void psb_intel_lvds_set_backlight(struct drm_device *dev, int level)
 183 {
 184         struct drm_psb_private *dev_priv = dev->dev_private;
 185         u32 blc_pwm_ctl;
 186
 187         if (gma_power_begin(dev, false)) {
 188                 blc_pwm_ctl = REG_READ(BLC_PWM_CTL);
 189                 blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 190                 REG_WRITE(BLC_PWM_CTL,
 191                                 (blc_pwm_ctl |
 192                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 193                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 194                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 195                 gma_power_end(dev);
 196         } else {
 197                 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
 198                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 199                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 200                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 201         }
 202 }
 203
 204 /*
 205  * Sets the power state for the panel.
 206  */
 207 static void psb_intel_lvds_set_power(struct drm_device *dev, bool on)
 208 {
 209         struct drm_psb_private *dev_priv = dev->dev_private;
 210         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 211         u32 pp_status;
 212
 213         if (!gma_power_begin(dev, true)) {
 214                 dev_err(dev->dev, "set power, chip off!\n");
 215                 return;
 216         }
 217
 218         if (on) {
 219                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 220                           POWER_TARGET_ON);
 221                 do {
 222                         pp_status = REG_READ(PP_STATUS);
 223                 } while ((pp_status & PP_ON) == 0);
 224
 225                 psb_intel_lvds_set_backlight(dev,
 226                                              mode_dev->backlight_duty_cycle);
 227         } else {
 228                 psb_intel_lvds_set_backlight(dev, 0);
 229
 230                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 231                           ~POWER_TARGET_ON);
 232                 do {
 233                         pp_status = REG_READ(PP_STATUS);
 234                 } while (pp_status & PP_ON);
 235         }
 236
 237         gma_power_end(dev);
 238 }
 239
 240 static void psb_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 241 {
 242         struct drm_device *dev = encoder->dev;
 243
 244         if (mode == DRM_MODE_DPMS_ON)
 245                 psb_intel_lvds_set_power(dev, true);
 246         else
 247                 psb_intel_lvds_set_power(dev, false);
 248
 249         /* XXX: We never power down the LVDS pairs. */
 250 }
 251
 252 static void psb_intel_lvds_save(struct drm_connector *connector)
 253 {
 254         struct drm_device *dev = connector->dev;
 255         struct drm_psb_private *dev_priv =
 256                 (struct drm_psb_private *)dev->dev_private;
 257         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 258         struct psb_intel_lvds_priv *lvds_priv =
 259                 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
 260
 261         lvds_priv->savePP_ON = REG_READ(LVDSPP_ON);
 262         lvds_priv->savePP_OFF = REG_READ(LVDSPP_OFF);
 263         lvds_priv->saveLVDS = REG_READ(LVDS);
 264         lvds_priv->savePP_CONTROL = REG_READ(PP_CONTROL);
 265         lvds_priv->savePP_CYCLE = REG_READ(PP_CYCLE);
 266         /*lvds_priv->savePP_DIVISOR = REG_READ(PP_DIVISOR);*/
 267         lvds_priv->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 268         lvds_priv->savePFIT_CONTROL = REG_READ(PFIT_CONTROL);
 269         lvds_priv->savePFIT_PGM_RATIOS = REG_READ(PFIT_PGM_RATIOS);
 270
 271         /*TODO: move backlight_duty_cycle to psb_intel_lvds_priv*/
 272         dev_priv->backlight_duty_cycle = (dev_priv->regs.saveBLC_PWM_CTL &
 273                                                 BACKLIGHT_DUTY_CYCLE_MASK);
 274
 275         /*
 276          * If the light is off at server startup,
 277          * just make it full brightness
 278          */
 279         if (dev_priv->backlight_duty_cycle == 0)
 280                 dev_priv->backlight_duty_cycle =
 281                 psb_intel_lvds_get_max_backlight(dev);
 282
 283         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 284                         lvds_priv->savePP_ON,
 285                         lvds_priv->savePP_OFF,
 286                         lvds_priv->saveLVDS,
 287                         lvds_priv->savePP_CONTROL,
 288                         lvds_priv->savePP_CYCLE,
 289                         lvds_priv->saveBLC_PWM_CTL);
 290 }
 291
 292 static void psb_intel_lvds_restore(struct drm_connector *connector)
 293 {
 294         struct drm_device *dev = connector->dev;
 295         u32 pp_status;
 296         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 297         struct psb_intel_lvds_priv *lvds_priv =
 298                 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
 299
 300         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 301                         lvds_priv->savePP_ON,
 302                         lvds_priv->savePP_OFF,
 303                         lvds_priv->saveLVDS,
 304                         lvds_priv->savePP_CONTROL,
 305                         lvds_priv->savePP_CYCLE,
 306                         lvds_priv->saveBLC_PWM_CTL);
 307
 308         REG_WRITE(BLC_PWM_CTL, lvds_priv->saveBLC_PWM_CTL);
 309         REG_WRITE(PFIT_CONTROL, lvds_priv->savePFIT_CONTROL);
 310         REG_WRITE(PFIT_PGM_RATIOS, lvds_priv->savePFIT_PGM_RATIOS);
 311         REG_WRITE(LVDSPP_ON, lvds_priv->savePP_ON);
 312         REG_WRITE(LVDSPP_OFF, lvds_priv->savePP_OFF);
 313         /*REG_WRITE(PP_DIVISOR, lvds_priv->savePP_DIVISOR);*/
 314         REG_WRITE(PP_CYCLE, lvds_priv->savePP_CYCLE);
 315         REG_WRITE(PP_CONTROL, lvds_priv->savePP_CONTROL);
 316         REG_WRITE(LVDS, lvds_priv->saveLVDS);
 317
 318         if (lvds_priv->savePP_CONTROL & POWER_TARGET_ON) {
 319                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 320                         POWER_TARGET_ON);
 321                 do {
 322                         pp_status = REG_READ(PP_STATUS);
 323                 } while ((pp_status & PP_ON) == 0);
 324         } else {
 325                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 326                         ~POWER_TARGET_ON);
 327                 do {
 328                         pp_status = REG_READ(PP_STATUS);
 329                 } while (pp_status & PP_ON);
 330         }
 331 }
 332
 333 enum drm_mode_status psb_intel_lvds_mode_valid(struct drm_connector *connector,
 334                                  struct drm_display_mode *mode)
 335 {
 336         struct drm_psb_private *dev_priv = connector->dev->dev_private;
 337         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 338         struct drm_display_mode *fixed_mode =
 339                                         dev_priv->mode_dev.panel_fixed_mode;
 340
 341         if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
 342                 fixed_mode = dev_priv->mode_dev.panel_fixed_mode2;
 343
 344         /* just in case */
 345         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 346                 return MODE_NO_DBLESCAN;
 347
 348         /* just in case */
 349         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 350                 return MODE_NO_INTERLACE;
 351
 352         if (fixed_mode) {
 353                 if (mode->hdisplay > fixed_mode->hdisplay)
 354                         return MODE_PANEL;
 355                 if (mode->vdisplay > fixed_mode->vdisplay)
 356                         return MODE_PANEL;
 357         }
 358         return MODE_OK;
 359 }
 360
 361 bool psb_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 362                                   const struct drm_display_mode *mode,
 363                                   struct drm_display_mode *adjusted_mode)
 364 {
 365         struct drm_device *dev = encoder->dev;
 366         struct drm_psb_private *dev_priv = dev->dev_private;
 367         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 368         struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
 369         struct drm_encoder *tmp_encoder;
 370         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 371         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 372
 373         if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
 374                 panel_fixed_mode = mode_dev->panel_fixed_mode2;
 375
 376         /* PSB requires the LVDS is on pipe B, MRST has only one pipe anyway */
 377         if (!IS_MRST(dev) && gma_crtc->pipe == 0) {
 378                 pr_err("Can't support LVDS on pipe A\n");
 379                 return false;
 380         }
 381         if (IS_MRST(dev) && gma_crtc->pipe != 0) {
 382                 pr_err("Must use PIPE A\n");
 383                 return false;
 384         }
 385         /* Should never happen!! */
 386         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 387                             head) {
 388                 if (tmp_encoder != encoder
 389                     && tmp_encoder->crtc == encoder->crtc) {
 390                         pr_err("Can't enable LVDS and another encoder on the same pipe\n");
 391                         return false;
 392                 }
 393         }
 394
 395         /*
 396          * If we have timings from the BIOS for the panel, put them in
 397          * to the adjusted mode.  The CRTC will be set up for this mode,
 398          * with the panel scaling set up to source from the H/VDisplay
 399          * of the original mode.
 400          */
 401         if (panel_fixed_mode != NULL) {
 402                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 403                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 404                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 405                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 406                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 407                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 408                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 409                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 410                 adjusted_mode->clock = panel_fixed_mode->clock;
 411                 drm_mode_set_crtcinfo(adjusted_mode,
 412                                       CRTC_INTERLACE_HALVE_V);
 413         }
 414
 415         /*
 416          * XXX: It would be nice to support lower refresh rates on the
 417          * panels to reduce power consumption, and perhaps match the
 418          * user's requested refresh rate.
 419          */
 420
 421         return true;
 422 }
 423
 424 static void psb_intel_lvds_prepare(struct drm_encoder *encoder)
 425 {
 426         struct drm_device *dev = encoder->dev;
 427         struct drm_psb_private *dev_priv = dev->dev_private;
 428         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 429
 430         if (!gma_power_begin(dev, true))
 431                 return;
 432
 433         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 434         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 435                                           BACKLIGHT_DUTY_CYCLE_MASK);
 436
 437         psb_intel_lvds_set_power(dev, false);
 438
 439         gma_power_end(dev);
 440 }
 441
 442 static void psb_intel_lvds_commit(struct drm_encoder *encoder)
 443 {
 444         struct drm_device *dev = encoder->dev;
 445         struct drm_psb_private *dev_priv = dev->dev_private;
 446         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 447
 448         if (mode_dev->backlight_duty_cycle == 0)
 449                 mode_dev->backlight_duty_cycle =
 450                     psb_intel_lvds_get_max_backlight(dev);
 451
 452         psb_intel_lvds_set_power(dev, true);
 453 }
 454
 455 static void psb_intel_lvds_mode_set(struct drm_encoder *encoder,
 456                                 struct drm_display_mode *mode,
 457                                 struct drm_display_mode *adjusted_mode)
 458 {
 459         struct drm_device *dev = encoder->dev;
 460         struct drm_psb_private *dev_priv = dev->dev_private;
 461         u32 pfit_control;
 462
 463         /*
 464          * The LVDS pin pair will already have been turned on in the
 465          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 466          * settings.
 467          */
 468
 469         /*
 470          * Enable automatic panel scaling so that non-native modes fill the
 471          * screen.  Should be enabled before the pipe is enabled, according to
 472          * register description and PRM.
 473          */
 474         if (mode->hdisplay != adjusted_mode->hdisplay ||
 475             mode->vdisplay != adjusted_mode->vdisplay)
 476                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 477                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 478                                 HORIZ_INTERP_BILINEAR);
 479         else
 480                 pfit_control = 0;
 481
 482         if (dev_priv->lvds_dither)
 483                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 484
 485         REG_WRITE(PFIT_CONTROL, pfit_control);
 486 }
 487
 488 /*
 489  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 490  */
 491 static int psb_intel_lvds_get_modes(struct drm_connector *connector)
 492 {
 493         struct drm_device *dev = connector->dev;
 494         struct drm_psb_private *dev_priv = dev->dev_private;
 495         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 496         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 497         struct psb_intel_lvds_priv *lvds_priv = gma_encoder->dev_priv;
 498         int ret = 0;
 499
 500         if (!IS_MRST(dev))
 501                 ret = psb_intel_ddc_get_modes(connector, &lvds_priv->i2c_bus->adapter);
 502
 503         if (ret)
 504                 return ret;
 505
 506         if (mode_dev->panel_fixed_mode != NULL) {
 507                 struct drm_display_mode *mode =
 508                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 509                 drm_mode_probed_add(connector, mode);
 510                 return 1;
 511         }
 512
 513         return 0;
 514 }
 515
 516 /**
 517  * psb_intel_lvds_destroy - unregister and free LVDS structures
 518  * @connector: connector to free
 519  *
 520  * Unregister the DDC bus for this connector then free the driver private
 521  * structure.
 522  */
 523 void psb_intel_lvds_destroy(struct drm_connector *connector)
 524 {
 525         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 526         struct psb_intel_lvds_priv *lvds_priv = gma_encoder->dev_priv;
 527
 528         psb_intel_i2c_destroy(lvds_priv->ddc_bus);
 529         drm_connector_unregister(connector);
 530         drm_connector_cleanup(connector);
 531         kfree(connector);
 532 }
 533
 534 int psb_intel_lvds_set_property(struct drm_connector *connector,
 535                                        struct drm_property *property,
 536                                        uint64_t value)
 537 {
 538         struct drm_encoder *encoder = connector->encoder;
 539
 540         if (!encoder)
 541                 return -1;
 542
 543         if (!strcmp(property->name, "scaling mode")) {
 544                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 545                 uint64_t curval;
 546
 547                 if (!crtc)
 548                         goto set_prop_error;
 549
 550                 switch (value) {
 551                 case DRM_MODE_SCALE_FULLSCREEN:
 552                         break;
 553                 case DRM_MODE_SCALE_NO_SCALE:
 554                         break;
 555                 case DRM_MODE_SCALE_ASPECT:
 556                         break;
 557                 default:
 558                         goto set_prop_error;
 559                 }
 560
 561                 if (drm_object_property_get_value(&connector->base,
 562                                                      property,
 563                                                      &curval))
 564                         goto set_prop_error;
 565
 566                 if (curval == value)
 567                         goto set_prop_done;
 568
 569                 if (drm_object_property_set_value(&connector->base,
 570                                                         property,
 571                                                         value))
 572                         goto set_prop_error;
 573
 574                 if (crtc->saved_mode.hdisplay != 0 &&
 575                     crtc->saved_mode.vdisplay != 0) {
 576                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 577                                                       &crtc->saved_mode,
 578                                                       encoder->crtc->x,
 579                                                       encoder->crtc->y,
 580                                                       encoder->crtc->primary->fb))
 581                                 goto set_prop_error;
 582                 }
 583         } else if (!strcmp(property->name, "backlight")) {
 584                 if (drm_object_property_set_value(&connector->base,
 585                                                         property,
 586                                                         value))
 587                         goto set_prop_error;
 588                 else
 589                         gma_backlight_set(encoder->dev, value);
 590         } else if (!strcmp(property->name, "DPMS")) {
 591                 const struct drm_encoder_helper_funcs *hfuncs
 592                                                 = encoder->helper_private;
 593                 hfuncs->dpms(encoder, value);
 594         }
 595
 596 set_prop_done:
 597         return 0;
 598 set_prop_error:
 599         return -1;
 600 }
 601
 602 static const struct drm_encoder_helper_funcs psb_intel_lvds_helper_funcs = {
 603         .dpms = psb_intel_lvds_encoder_dpms,
 604         .mode_fixup = psb_intel_lvds_mode_fixup,
 605         .prepare = psb_intel_lvds_prepare,
 606         .mode_set = psb_intel_lvds_mode_set,
 607         .commit = psb_intel_lvds_commit,
 608 };
 609
 610 const struct drm_connector_helper_funcs
 611                                 psb_intel_lvds_connector_helper_funcs = {
 612         .get_modes = psb_intel_lvds_get_modes,
 613         .mode_valid = psb_intel_lvds_mode_valid,
 614         .best_encoder = gma_best_encoder,
 615 };
 616
 617 const struct drm_connector_funcs psb_intel_lvds_connector_funcs = {
 618         .dpms = drm_helper_connector_dpms,
 619         .fill_modes = drm_helper_probe_single_connector_modes,
 620         .set_property = psb_intel_lvds_set_property,
 621         .destroy = psb_intel_lvds_destroy,
 622 };
 623
 624
 625 static void psb_intel_lvds_enc_destroy(struct drm_encoder *encoder)
 626 {
 627         drm_encoder_cleanup(encoder);
 628 }
 629
 630 const struct drm_encoder_funcs psb_intel_lvds_enc_funcs = {
 631         .destroy = psb_intel_lvds_enc_destroy,
 632 };
 633
 634
 635
 636 /**
 637  * psb_intel_lvds_init - setup LVDS connectors on this device
 638  * @dev: drm device
 639  *
 640  * Create the connector, register the LVDS DDC bus, and try to figure out what
 641  * modes we can display on the LVDS panel (if present).
 642  */
 643 void psb_intel_lvds_init(struct drm_device *dev,
 644                          struct psb_intel_mode_device *mode_dev)
 645 {
 646         struct gma_encoder *gma_encoder;
 647         struct gma_connector *gma_connector;
 648         struct psb_intel_lvds_priv *lvds_priv;
 649         struct drm_connector *connector;
 650         struct drm_encoder *encoder;
 651         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 652         struct drm_crtc *crtc;
 653         struct drm_psb_private *dev_priv = dev->dev_private;
 654         u32 lvds;
 655         int pipe;
 656
 657         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 658         if (!gma_encoder) {
 659                 dev_err(dev->dev, "gma_encoder allocation error\n");
 660                 return;
 661         }
 662
 663         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 664         if (!gma_connector) {
 665                 dev_err(dev->dev, "gma_connector allocation error\n");
 666                 goto failed_encoder;
 667         }
 668
 669         lvds_priv = kzalloc(sizeof(struct psb_intel_lvds_priv), GFP_KERNEL);
 670         if (!lvds_priv) {
 671                 dev_err(dev->dev, "LVDS private allocation error\n");
 672                 goto failed_connector;
 673         }
 674
 675         gma_encoder->dev_priv = lvds_priv;
 676
 677         connector = &gma_connector->base;
 678         gma_connector->save = psb_intel_lvds_save;
 679         gma_connector->restore = psb_intel_lvds_restore;
 680
 681         encoder = &gma_encoder->base;
 682         drm_connector_init(dev, connector,
 683                            &psb_intel_lvds_connector_funcs,
 684                            DRM_MODE_CONNECTOR_LVDS);
 685
 686         drm_encoder_init(dev, encoder,
 687                          &psb_intel_lvds_enc_funcs,
 688                          DRM_MODE_ENCODER_LVDS, NULL);
 689
 690         gma_connector_attach_encoder(gma_connector, gma_encoder);
 691         gma_encoder->type = INTEL_OUTPUT_LVDS;
 692
 693         drm_encoder_helper_add(encoder, &psb_intel_lvds_helper_funcs);
 694         drm_connector_helper_add(connector,
 695                                  &psb_intel_lvds_connector_helper_funcs);
 696         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 697         connector->interlace_allowed = false;
 698         connector->doublescan_allowed = false;
 699
 700         /*Attach connector properties*/
 701         drm_object_attach_property(&connector->base,
 702                                       dev->mode_config.scaling_mode_property,
 703                                       DRM_MODE_SCALE_FULLSCREEN);
 704         drm_object_attach_property(&connector->base,
 705                                       dev_priv->backlight_property,
 706                                       BRIGHTNESS_MAX_LEVEL);
 707
 708         /*
 709          * Set up I2C bus
 710          * FIXME: distroy i2c_bus when exit
 711          */
 712         lvds_priv->i2c_bus = psb_intel_i2c_create(dev, GPIOB, "LVDSBLC_B");
 713         if (!lvds_priv->i2c_bus) {
 714                 dev_printk(KERN_ERR,
 715                         &dev->pdev->dev, "I2C bus registration failed.\n");
 716                 goto failed_blc_i2c;
 717         }
 718         lvds_priv->i2c_bus->slave_addr = 0x2C;
 719         dev_priv->lvds_i2c_bus =  lvds_priv->i2c_bus;
 720
 721         /*
 722          * LVDS discovery:
 723          * 1) check for EDID on DDC
 724          * 2) check for VBT data
 725          * 3) check to see if LVDS is already on
 726          *    if none of the above, no panel
 727          * 4) make sure lid is open
 728          *    if closed, act like it's not there for now
 729          */
 730
 731         /* Set up the DDC bus. */
 732         lvds_priv->ddc_bus = psb_intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 733         if (!lvds_priv->ddc_bus) {
 734                 dev_printk(KERN_ERR, &dev->pdev->dev,
 735                            "DDC bus registration " "failed.\n");
 736                 goto failed_ddc;
 737         }
 738
 739         /*
 740          * Attempt to get the fixed panel mode from DDC.  Assume that the
 741          * preferred mode is the right one.
 742          */
 743         mutex_lock(&dev->mode_config.mutex);
 744         psb_intel_ddc_get_modes(connector, &lvds_priv->ddc_bus->adapter);
 745         list_for_each_entry(scan, &connector->probed_modes, head) {
 746                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 747                         mode_dev->panel_fixed_mode =
 748                             drm_mode_duplicate(dev, scan);
 749                         DRM_DEBUG_KMS("Using mode from DDC\n");
 750                         goto out;       /* FIXME: check for quirks */
 751                 }
 752         }
 753
 754         /* Failed to get EDID, what about VBT? do we need this? */
 755         if (dev_priv->lfp_lvds_vbt_mode) {
 756                 mode_dev->panel_fixed_mode =
 757                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 758
 759                 if (mode_dev->panel_fixed_mode) {
 760                         mode_dev->panel_fixed_mode->type |=
 761                                 DRM_MODE_TYPE_PREFERRED;
 762                         DRM_DEBUG_KMS("Using mode from VBT\n");
 763                         goto out;
 764                 }
 765         }
 766
 767         /*
 768          * If we didn't get EDID, try checking if the panel is already turned
 769          * on.  If so, assume that whatever is currently programmed is the
 770          * correct mode.
 771          */
 772         lvds = REG_READ(LVDS);
 773         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 774         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 775
 776         if (crtc && (lvds & LVDS_PORT_EN)) {
 777                 mode_dev->panel_fixed_mode =
 778                     psb_intel_crtc_mode_get(dev, crtc);
 779                 if (mode_dev->panel_fixed_mode) {
 780                         mode_dev->panel_fixed_mode->type |=
 781                             DRM_MODE_TYPE_PREFERRED;
 782                         DRM_DEBUG_KMS("Using pre-programmed mode\n");
 783                         goto out;       /* FIXME: check for quirks */
 784                 }
 785         }
 786
 787         /* If we still don't have a mode after all that, give up. */
 788         if (!mode_dev->panel_fixed_mode) {
 789                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 790                 goto failed_find;
 791         }
 792
 793         /*
 794          * Blacklist machines with BIOSes that list an LVDS panel without
 795          * actually having one.
 796          */
 797 out:
 798         mutex_unlock(&dev->mode_config.mutex);
 799         drm_connector_register(connector);
 800         return;
 801
 802 failed_find:
 803         mutex_unlock(&dev->mode_config.mutex);
 804         psb_intel_i2c_destroy(lvds_priv->ddc_bus);
 805 failed_ddc:
 806         psb_intel_i2c_destroy(lvds_priv->i2c_bus);
 807 failed_blc_i2c:
 808         drm_encoder_cleanup(encoder);
 809         drm_connector_cleanup(connector);
 810 failed_connector:
 811         kfree(gma_connector);
 812 failed_encoder:
 813         kfree(gma_encoder);
 814 }
 815