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_crtc_helper.h>
  15 #include <drm/drm_modeset_helper_vtables.h>
  16 #include <drm/drm_simple_kms_helper.h>
  17
  18 #include "intel_bios.h"
  19 #include "power.h"
  20 #include "psb_drv.h"
  21 #include "psb_intel_drv.h"
  22 #include "psb_intel_reg.h"
  23
  24 /*
  25  * LVDS I2C backlight control macros
  26  */
  27 #define BRIGHTNESS_MAX_LEVEL 100
  28 #define BRIGHTNESS_MASK 0xFF
  29 #define BLC_I2C_TYPE    0x01
  30 #define BLC_PWM_TYPT    0x02
  31
  32 #define BLC_POLARITY_NORMAL 0
  33 #define BLC_POLARITY_INVERSE 1
  34
  35 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
  36 #define PSB_BLC_MIN_PWM_REG_FREQ        (0x2)
  37 #define PSB_BLC_PWM_PRECISION_FACTOR    (10)
  38 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  39 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  40
  41 struct psb_intel_lvds_priv {
  42         /*
  43          * Saved LVDO output states
  44          */
  45         uint32_t savePP_ON;
  46         uint32_t savePP_OFF;
  47         uint32_t saveLVDS;
  48         uint32_t savePP_CONTROL;
  49         uint32_t savePP_CYCLE;
  50         uint32_t savePFIT_CONTROL;
  51         uint32_t savePFIT_PGM_RATIOS;
  52         uint32_t saveBLC_PWM_CTL;
  53
  54         struct gma_i2c_chan *i2c_bus;
  55 };
  56
  57
  58 /*
  59  * Returns the maximum level of the backlight duty cycle field.
  60  */
  61 static u32 psb_intel_lvds_get_max_backlight(struct drm_device *dev)
  62 {
  63         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
  64         u32 ret;
  65
  66         if (gma_power_begin(dev, false)) {
  67                 ret = REG_READ(BLC_PWM_CTL);
  68                 gma_power_end(dev);
  69         } else /* Powered off, use the saved value */
  70                 ret = dev_priv->regs.saveBLC_PWM_CTL;
  71
  72         /* Top 15bits hold the frequency mask */
  73         ret = (ret &  BACKLIGHT_MODULATION_FREQ_MASK) >>
  74                                         BACKLIGHT_MODULATION_FREQ_SHIFT;
  75
  76         ret *= 2;       /* Return a 16bit range as needed for setting */
  77         if (ret == 0)
  78                 dev_err(dev->dev, "BL bug: Reg %08x save %08X\n",
  79                         REG_READ(BLC_PWM_CTL), dev_priv->regs.saveBLC_PWM_CTL);
  80         return ret;
  81 }
  82
  83 /*
  84  * Set LVDS backlight level by I2C command
  85  *
  86  * FIXME: at some point we need to both track this for PM and also
  87  * disable runtime pm on MRST if the brightness is nil (ie blanked)
  88  */
  89 static int psb_lvds_i2c_set_brightness(struct drm_device *dev,
  90                                         unsigned int level)
  91 {
  92         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
  93
  94         struct gma_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus;
  95         u8 out_buf[2];
  96         unsigned int blc_i2c_brightness;
  97
  98         struct i2c_msg msgs[] = {
  99                 {
 100                         .addr = lvds_i2c_bus->slave_addr,
 101                         .flags = 0,
 102                         .len = 2,
 103                         .buf = out_buf,
 104                 }
 105         };
 106
 107         blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level *
 108                              BRIGHTNESS_MASK /
 109                              BRIGHTNESS_MAX_LEVEL);
 110
 111         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 112                 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness;
 113
 114         out_buf[0] = dev_priv->lvds_bl->brightnesscmd;
 115         out_buf[1] = (u8)blc_i2c_brightness;
 116
 117         if (i2c_transfer(&lvds_i2c_bus->base, msgs, 1) == 1) {
 118                 dev_dbg(dev->dev, "I2C set brightness.(command, value) (%d, %d)\n",
 119                         dev_priv->lvds_bl->brightnesscmd,
 120                         blc_i2c_brightness);
 121                 return 0;
 122         }
 123
 124         dev_err(dev->dev, "I2C transfer error\n");
 125         return -1;
 126 }
 127
 128
 129 static int psb_lvds_pwm_set_brightness(struct drm_device *dev, int level)
 130 {
 131         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 132
 133         u32 max_pwm_blc;
 134         u32 blc_pwm_duty_cycle;
 135
 136         max_pwm_blc = psb_intel_lvds_get_max_backlight(dev);
 137
 138         /*BLC_PWM_CTL Should be initiated while backlight device init*/
 139         BUG_ON(max_pwm_blc == 0);
 140
 141         blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
 142
 143         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 144                 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle;
 145
 146         blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
 147         REG_WRITE(BLC_PWM_CTL,
 148                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 149                   (blc_pwm_duty_cycle));
 150
 151         dev_info(dev->dev, "Backlight lvds set brightness %08x\n",
 152                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 153                   (blc_pwm_duty_cycle));
 154
 155         return 0;
 156 }
 157
 158 /*
 159  * Set LVDS backlight level either by I2C or PWM
 160  */
 161 void psb_intel_lvds_set_brightness(struct drm_device *dev, int level)
 162 {
 163         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 164
 165         dev_dbg(dev->dev, "backlight level is %d\n", level);
 166
 167         if (!dev_priv->lvds_bl) {
 168                 dev_err(dev->dev, "NO LVDS backlight info\n");
 169                 return;
 170         }
 171
 172         if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
 173                 psb_lvds_i2c_set_brightness(dev, level);
 174         else
 175                 psb_lvds_pwm_set_brightness(dev, level);
 176 }
 177
 178 /*
 179  * Sets the backlight level.
 180  *
 181  * level: backlight level, from 0 to psb_intel_lvds_get_max_backlight().
 182  */
 183 static void psb_intel_lvds_set_backlight(struct drm_device *dev, int level)
 184 {
 185         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 186         u32 blc_pwm_ctl;
 187
 188         if (gma_power_begin(dev, false)) {
 189                 blc_pwm_ctl = REG_READ(BLC_PWM_CTL);
 190                 blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 191                 REG_WRITE(BLC_PWM_CTL,
 192                                 (blc_pwm_ctl |
 193                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 194                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 195                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 196                 gma_power_end(dev);
 197         } else {
 198                 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
 199                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 200                 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
 201                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 202         }
 203 }
 204
 205 /*
 206  * Sets the power state for the panel.
 207  */
 208 static void psb_intel_lvds_set_power(struct drm_device *dev, bool on)
 209 {
 210         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 211         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 212         u32 pp_status;
 213
 214         if (!gma_power_begin(dev, true)) {
 215                 dev_err(dev->dev, "set power, chip off!\n");
 216                 return;
 217         }
 218
 219         if (on) {
 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) == 0);
 225
 226                 psb_intel_lvds_set_backlight(dev,
 227                                              mode_dev->backlight_duty_cycle);
 228         } else {
 229                 psb_intel_lvds_set_backlight(dev, 0);
 230
 231                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 232                           ~POWER_TARGET_ON);
 233                 do {
 234                         pp_status = REG_READ(PP_STATUS);
 235                 } while (pp_status & PP_ON);
 236         }
 237
 238         gma_power_end(dev);
 239 }
 240
 241 static void psb_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 242 {
 243         struct drm_device *dev = encoder->dev;
 244
 245         if (mode == DRM_MODE_DPMS_ON)
 246                 psb_intel_lvds_set_power(dev, true);
 247         else
 248                 psb_intel_lvds_set_power(dev, false);
 249
 250         /* XXX: We never power down the LVDS pairs. */
 251 }
 252
 253 static void psb_intel_lvds_save(struct drm_connector *connector)
 254 {
 255         struct drm_device *dev = connector->dev;
 256         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 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 = to_drm_psb_private(connector->dev);
 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 = to_drm_psb_private(dev);
 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 = to_drm_psb_private(dev);
 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 = to_drm_psb_private(dev);
 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 = to_drm_psb_private(dev);
 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 = to_drm_psb_private(dev);
 495         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 496         int ret = 0;
 497
 498         if (!IS_MRST(dev))
 499                 ret = psb_intel_ddc_get_modes(connector, connector->ddc);
 500
 501         if (ret)
 502                 return ret;
 503
 504         if (mode_dev->panel_fixed_mode != NULL) {
 505                 struct drm_display_mode *mode =
 506                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 507                 drm_mode_probed_add(connector, mode);
 508                 return 1;
 509         }
 510
 511         return 0;
 512 }
 513
 514 void psb_intel_lvds_destroy(struct drm_connector *connector)
 515 {
 516         struct gma_connector *gma_connector = to_gma_connector(connector);
 517         struct gma_i2c_chan *ddc_bus = to_gma_i2c_chan(connector->ddc);
 518
 519         gma_i2c_destroy(ddc_bus);
 520         drm_connector_cleanup(connector);
 521         kfree(gma_connector);
 522 }
 523
 524 int psb_intel_lvds_set_property(struct drm_connector *connector,
 525                                        struct drm_property *property,
 526                                        uint64_t value)
 527 {
 528         struct drm_encoder *encoder = connector->encoder;
 529
 530         if (!encoder)
 531                 return -1;
 532
 533         if (!strcmp(property->name, "scaling mode")) {
 534                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 535                 uint64_t curval;
 536
 537                 if (!crtc)
 538                         goto set_prop_error;
 539
 540                 switch (value) {
 541                 case DRM_MODE_SCALE_FULLSCREEN:
 542                         break;
 543                 case DRM_MODE_SCALE_NO_SCALE:
 544                         break;
 545                 case DRM_MODE_SCALE_ASPECT:
 546                         break;
 547                 default:
 548                         goto set_prop_error;
 549                 }
 550
 551                 if (drm_object_property_get_value(&connector->base,
 552                                                      property,
 553                                                      &curval))
 554                         goto set_prop_error;
 555
 556                 if (curval == value)
 557                         goto set_prop_done;
 558
 559                 if (drm_object_property_set_value(&connector->base,
 560                                                         property,
 561                                                         value))
 562                         goto set_prop_error;
 563
 564                 if (crtc->saved_mode.hdisplay != 0 &&
 565                     crtc->saved_mode.vdisplay != 0) {
 566                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 567                                                       &crtc->saved_mode,
 568                                                       encoder->crtc->x,
 569                                                       encoder->crtc->y,
 570                                                       encoder->crtc->primary->fb))
 571                                 goto set_prop_error;
 572                 }
 573         } else if (!strcmp(property->name, "backlight")) {
 574                 if (drm_object_property_set_value(&connector->base,
 575                                                         property,
 576                                                         value))
 577                         goto set_prop_error;
 578                 else
 579                         gma_backlight_set(encoder->dev, value);
 580         } else if (!strcmp(property->name, "DPMS")) {
 581                 const struct drm_encoder_helper_funcs *hfuncs
 582                                                 = encoder->helper_private;
 583                 hfuncs->dpms(encoder, value);
 584         }
 585
 586 set_prop_done:
 587         return 0;
 588 set_prop_error:
 589         return -1;
 590 }
 591
 592 static const struct drm_encoder_helper_funcs psb_intel_lvds_helper_funcs = {
 593         .dpms = psb_intel_lvds_encoder_dpms,
 594         .mode_fixup = psb_intel_lvds_mode_fixup,
 595         .prepare = psb_intel_lvds_prepare,
 596         .mode_set = psb_intel_lvds_mode_set,
 597         .commit = psb_intel_lvds_commit,
 598 };
 599
 600 const struct drm_connector_helper_funcs
 601                                 psb_intel_lvds_connector_helper_funcs = {
 602         .get_modes = psb_intel_lvds_get_modes,
 603         .mode_valid = psb_intel_lvds_mode_valid,
 604         .best_encoder = gma_best_encoder,
 605 };
 606
 607 const struct drm_connector_funcs psb_intel_lvds_connector_funcs = {
 608         .dpms = drm_helper_connector_dpms,
 609         .fill_modes = drm_helper_probe_single_connector_modes,
 610         .set_property = psb_intel_lvds_set_property,
 611         .destroy = psb_intel_lvds_destroy,
 612 };
 613
 614 /**
 615  * psb_intel_lvds_init - setup LVDS connectors on this device
 616  * @dev: drm device
 617  * @mode_dev: mode device
 618  *
 619  * Create the connector, register the LVDS DDC bus, and try to figure out what
 620  * modes we can display on the LVDS panel (if present).
 621  */
 622 void psb_intel_lvds_init(struct drm_device *dev,
 623                          struct psb_intel_mode_device *mode_dev)
 624 {
 625         struct gma_encoder *gma_encoder;
 626         struct gma_connector *gma_connector;
 627         struct psb_intel_lvds_priv *lvds_priv;
 628         struct drm_connector *connector;
 629         struct drm_encoder *encoder;
 630         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 631         struct drm_crtc *crtc;
 632         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 633         struct gma_i2c_chan *ddc_bus;
 634         u32 lvds;
 635         int pipe;
 636         int ret;
 637
 638         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 639         if (!gma_encoder) {
 640                 dev_err(dev->dev, "gma_encoder allocation error\n");
 641                 return;
 642         }
 643         encoder = &gma_encoder->base;
 644
 645         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 646         if (!gma_connector) {
 647                 dev_err(dev->dev, "gma_connector allocation error\n");
 648                 goto err_free_encoder;
 649         }
 650
 651         lvds_priv = kzalloc(sizeof(struct psb_intel_lvds_priv), GFP_KERNEL);
 652         if (!lvds_priv) {
 653                 dev_err(dev->dev, "LVDS private allocation error\n");
 654                 goto err_free_connector;
 655         }
 656
 657         gma_encoder->dev_priv = lvds_priv;
 658
 659         connector = &gma_connector->base;
 660         gma_connector->save = psb_intel_lvds_save;
 661         gma_connector->restore = psb_intel_lvds_restore;
 662
 663         /* Set up the DDC bus. */
 664         ddc_bus = gma_i2c_create(dev, GPIOC, "LVDSDDC_C");
 665         if (!ddc_bus) {
 666                 dev_printk(KERN_ERR, dev->dev,
 667                            "DDC bus registration " "failed.\n");
 668                 goto err_free_lvds_priv;
 669         }
 670
 671         ret = drm_connector_init_with_ddc(dev, connector,
 672                                           &psb_intel_lvds_connector_funcs,
 673                                           DRM_MODE_CONNECTOR_LVDS,
 674                                           &ddc_bus->base);
 675         if (ret)
 676                 goto err_ddc_destroy;
 677
 678         ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 679         if (ret)
 680                 goto err_connector_cleanup;
 681
 682         gma_connector_attach_encoder(gma_connector, gma_encoder);
 683         gma_encoder->type = INTEL_OUTPUT_LVDS;
 684
 685         drm_encoder_helper_add(encoder, &psb_intel_lvds_helper_funcs);
 686         drm_connector_helper_add(connector,
 687                                  &psb_intel_lvds_connector_helper_funcs);
 688         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 689         connector->interlace_allowed = false;
 690         connector->doublescan_allowed = false;
 691
 692         /*Attach connector properties*/
 693         drm_object_attach_property(&connector->base,
 694                                       dev->mode_config.scaling_mode_property,
 695                                       DRM_MODE_SCALE_FULLSCREEN);
 696         drm_object_attach_property(&connector->base,
 697                                       dev_priv->backlight_property,
 698                                       BRIGHTNESS_MAX_LEVEL);
 699
 700         /*
 701          * Set up I2C bus
 702          * FIXME: distroy i2c_bus when exit
 703          */
 704         lvds_priv->i2c_bus = gma_i2c_create(dev, GPIOB, "LVDSBLC_B");
 705         if (!lvds_priv->i2c_bus) {
 706                 dev_printk(KERN_ERR,
 707                         dev->dev, "I2C bus registration failed.\n");
 708                 goto err_encoder_cleanup;
 709         }
 710         lvds_priv->i2c_bus->slave_addr = 0x2C;
 711         dev_priv->lvds_i2c_bus =  lvds_priv->i2c_bus;
 712
 713         /*
 714          * LVDS discovery:
 715          * 1) check for EDID on DDC
 716          * 2) check for VBT data
 717          * 3) check to see if LVDS is already on
 718          *    if none of the above, no panel
 719          * 4) make sure lid is open
 720          *    if closed, act like it's not there for now
 721          */
 722
 723         /*
 724          * Attempt to get the fixed panel mode from DDC.  Assume that the
 725          * preferred mode is the right one.
 726          */
 727         mutex_lock(&dev->mode_config.mutex);
 728         psb_intel_ddc_get_modes(connector, &ddc_bus->base);
 729
 730         list_for_each_entry(scan, &connector->probed_modes, head) {
 731                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 732                         mode_dev->panel_fixed_mode =
 733                             drm_mode_duplicate(dev, scan);
 734                         DRM_DEBUG_KMS("Using mode from DDC\n");
 735                         goto out;       /* FIXME: check for quirks */
 736                 }
 737         }
 738
 739         /* Failed to get EDID, what about VBT? do we need this? */
 740         if (dev_priv->lfp_lvds_vbt_mode) {
 741                 mode_dev->panel_fixed_mode =
 742                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 743
 744                 if (mode_dev->panel_fixed_mode) {
 745                         mode_dev->panel_fixed_mode->type |=
 746                                 DRM_MODE_TYPE_PREFERRED;
 747                         DRM_DEBUG_KMS("Using mode from VBT\n");
 748                         goto out;
 749                 }
 750         }
 751
 752         /*
 753          * If we didn't get EDID, try checking if the panel is already turned
 754          * on.  If so, assume that whatever is currently programmed is the
 755          * correct mode.
 756          */
 757         lvds = REG_READ(LVDS);
 758         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 759         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 760
 761         if (crtc && (lvds & LVDS_PORT_EN)) {
 762                 mode_dev->panel_fixed_mode =
 763                     psb_intel_crtc_mode_get(dev, crtc);
 764                 if (mode_dev->panel_fixed_mode) {
 765                         mode_dev->panel_fixed_mode->type |=
 766                             DRM_MODE_TYPE_PREFERRED;
 767                         DRM_DEBUG_KMS("Using pre-programmed mode\n");
 768                         goto out;       /* FIXME: check for quirks */
 769                 }
 770         }
 771
 772         /* If we still don't have a mode after all that, give up. */
 773         if (!mode_dev->panel_fixed_mode) {
 774                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 775                 goto err_unlock;
 776         }
 777
 778         /*
 779          * Blacklist machines with BIOSes that list an LVDS panel without
 780          * actually having one.
 781          */
 782 out:
 783         mutex_unlock(&dev->mode_config.mutex);
 784         return;
 785
 786 err_unlock:
 787         mutex_unlock(&dev->mode_config.mutex);
 788         gma_i2c_destroy(lvds_priv->i2c_bus);
 789 err_encoder_cleanup:
 790         drm_encoder_cleanup(encoder);
 791 err_connector_cleanup:
 792         drm_connector_cleanup(connector);
 793 err_ddc_destroy:
 794         gma_i2c_destroy(ddc_bus);
 795 err_free_lvds_priv:
 796         kfree(lvds_priv);
 797 err_free_connector:
 798         kfree(gma_connector);
 799 err_free_encoder:
 800         kfree(gma_encoder);
 801 }
 802