drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/moduleparam.h>
  34 #include "intel_drv.h"
  35
  36 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  37
  38 void
  39 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  40                        struct drm_display_mode *adjusted_mode)
  41 {
  42         drm_mode_copy(adjusted_mode, fixed_mode);
  43
  44         drm_mode_set_crtcinfo(adjusted_mode, 0);
  45 }
  46
  47 /* adjusted_mode has been preset to be the panel's fixed mode */
  48 void
  49 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
  50                         struct intel_crtc_config *pipe_config,
  51                         int fitting_mode)
  52 {
  53         struct drm_display_mode *adjusted_mode;
  54         int x, y, width, height;
  55
  56         adjusted_mode = &pipe_config->adjusted_mode;
  57
  58         x = y = width = height = 0;
  59
  60         /* Native modes don't need fitting */
  61         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
  62             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
  63                 goto done;
  64
  65         switch (fitting_mode) {
  66         case DRM_MODE_SCALE_CENTER:
  67                 width = pipe_config->pipe_src_w;
  68                 height = pipe_config->pipe_src_h;
  69                 x = (adjusted_mode->hdisplay - width + 1)/2;
  70                 y = (adjusted_mode->vdisplay - height + 1)/2;
  71                 break;
  72
  73         case DRM_MODE_SCALE_ASPECT:
  74                 /* Scale but preserve the aspect ratio */
  75                 {
  76                         u32 scaled_width = adjusted_mode->hdisplay
  77                                 * pipe_config->pipe_src_h;
  78                         u32 scaled_height = pipe_config->pipe_src_w
  79                                 * adjusted_mode->vdisplay;
  80                         if (scaled_width > scaled_height) { /* pillar */
  81                                 width = scaled_height / pipe_config->pipe_src_h;
  82                                 if (width & 1)
  83                                         width++;
  84                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
  85                                 y = 0;
  86                                 height = adjusted_mode->vdisplay;
  87                         } else if (scaled_width < scaled_height) { /* letter */
  88                                 height = scaled_width / pipe_config->pipe_src_w;
  89                                 if (height & 1)
  90                                     height++;
  91                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
  92                                 x = 0;
  93                                 width = adjusted_mode->hdisplay;
  94                         } else {
  95                                 x = y = 0;
  96                                 width = adjusted_mode->hdisplay;
  97                                 height = adjusted_mode->vdisplay;
  98                         }
  99                 }
 100                 break;
 101
 102         case DRM_MODE_SCALE_FULLSCREEN:
 103                 x = y = 0;
 104                 width = adjusted_mode->hdisplay;
 105                 height = adjusted_mode->vdisplay;
 106                 break;
 107
 108         default:
 109                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 110                 return;
 111         }
 112
 113 done:
 114         pipe_config->pch_pfit.pos = (x << 16) | y;
 115         pipe_config->pch_pfit.size = (width << 16) | height;
 116         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 117 }
 118
 119 static void
 120 centre_horizontally(struct drm_display_mode *mode,
 121                     int width)
 122 {
 123         u32 border, sync_pos, blank_width, sync_width;
 124
 125         /* keep the hsync and hblank widths constant */
 126         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 127         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 128         sync_pos = (blank_width - sync_width + 1) / 2;
 129
 130         border = (mode->hdisplay - width + 1) / 2;
 131         border += border & 1; /* make the border even */
 132
 133         mode->crtc_hdisplay = width;
 134         mode->crtc_hblank_start = width + border;
 135         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 136
 137         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 138         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 139 }
 140
 141 static void
 142 centre_vertically(struct drm_display_mode *mode,
 143                   int height)
 144 {
 145         u32 border, sync_pos, blank_width, sync_width;
 146
 147         /* keep the vsync and vblank widths constant */
 148         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 149         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 150         sync_pos = (blank_width - sync_width + 1) / 2;
 151
 152         border = (mode->vdisplay - height + 1) / 2;
 153
 154         mode->crtc_vdisplay = height;
 155         mode->crtc_vblank_start = height + border;
 156         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 157
 158         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 159         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 160 }
 161
 162 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 163 {
 164         /*
 165          * Floating point operation is not supported. So the FACTOR
 166          * is defined, which can avoid the floating point computation
 167          * when calculating the panel ratio.
 168          */
 169 #define ACCURACY 12
 170 #define FACTOR (1 << ACCURACY)
 171         u32 ratio = source * FACTOR / target;
 172         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 173 }
 174
 175 static void i965_scale_aspect(struct intel_crtc_config *pipe_config,
 176                               u32 *pfit_control)
 177 {
 178         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 179         u32 scaled_width = adjusted_mode->hdisplay *
 180                 pipe_config->pipe_src_h;
 181         u32 scaled_height = pipe_config->pipe_src_w *
 182                 adjusted_mode->vdisplay;
 183
 184         /* 965+ is easy, it does everything in hw */
 185         if (scaled_width > scaled_height)
 186                 *pfit_control |= PFIT_ENABLE |
 187                         PFIT_SCALING_PILLAR;
 188         else if (scaled_width < scaled_height)
 189                 *pfit_control |= PFIT_ENABLE |
 190                         PFIT_SCALING_LETTER;
 191         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 192                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 193 }
 194
 195 static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config,
 196                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 197                               u32 *border)
 198 {
 199         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 200         u32 scaled_width = adjusted_mode->hdisplay *
 201                 pipe_config->pipe_src_h;
 202         u32 scaled_height = pipe_config->pipe_src_w *
 203                 adjusted_mode->vdisplay;
 204         u32 bits;
 205
 206         /*
 207          * For earlier chips we have to calculate the scaling
 208          * ratio by hand and program it into the
 209          * PFIT_PGM_RATIO register
 210          */
 211         if (scaled_width > scaled_height) { /* pillar */
 212                 centre_horizontally(adjusted_mode,
 213                                     scaled_height /
 214                                     pipe_config->pipe_src_h);
 215
 216                 *border = LVDS_BORDER_ENABLE;
 217                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 218                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 219                                                     adjusted_mode->vdisplay);
 220
 221                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 222                                              bits << PFIT_VERT_SCALE_SHIFT);
 223                         *pfit_control |= (PFIT_ENABLE |
 224                                           VERT_INTERP_BILINEAR |
 225                                           HORIZ_INTERP_BILINEAR);
 226                 }
 227         } else if (scaled_width < scaled_height) { /* letter */
 228                 centre_vertically(adjusted_mode,
 229                                   scaled_width /
 230                                   pipe_config->pipe_src_w);
 231
 232                 *border = LVDS_BORDER_ENABLE;
 233                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 234                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 235                                                     adjusted_mode->hdisplay);
 236
 237                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 238                                              bits << PFIT_VERT_SCALE_SHIFT);
 239                         *pfit_control |= (PFIT_ENABLE |
 240                                           VERT_INTERP_BILINEAR |
 241                                           HORIZ_INTERP_BILINEAR);
 242                 }
 243         } else {
 244                 /* Aspects match, Let hw scale both directions */
 245                 *pfit_control |= (PFIT_ENABLE |
 246                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 247                                   VERT_INTERP_BILINEAR |
 248                                   HORIZ_INTERP_BILINEAR);
 249         }
 250 }
 251
 252 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 253                               struct intel_crtc_config *pipe_config,
 254                               int fitting_mode)
 255 {
 256         struct drm_device *dev = intel_crtc->base.dev;
 257         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 258         struct drm_display_mode *adjusted_mode;
 259
 260         adjusted_mode = &pipe_config->adjusted_mode;
 261
 262         /* Native modes don't need fitting */
 263         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 264             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 265                 goto out;
 266
 267         switch (fitting_mode) {
 268         case DRM_MODE_SCALE_CENTER:
 269                 /*
 270                  * For centered modes, we have to calculate border widths &
 271                  * heights and modify the values programmed into the CRTC.
 272                  */
 273                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 274                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 275                 border = LVDS_BORDER_ENABLE;
 276                 break;
 277         case DRM_MODE_SCALE_ASPECT:
 278                 /* Scale but preserve the aspect ratio */
 279                 if (INTEL_INFO(dev)->gen >= 4)
 280                         i965_scale_aspect(pipe_config, &pfit_control);
 281                 else
 282                         i9xx_scale_aspect(pipe_config, &pfit_control,
 283                                           &pfit_pgm_ratios, &border);
 284                 break;
 285         case DRM_MODE_SCALE_FULLSCREEN:
 286                 /*
 287                  * Full scaling, even if it changes the aspect ratio.
 288                  * Fortunately this is all done for us in hw.
 289                  */
 290                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 291                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 292                         pfit_control |= PFIT_ENABLE;
 293                         if (INTEL_INFO(dev)->gen >= 4)
 294                                 pfit_control |= PFIT_SCALING_AUTO;
 295                         else
 296                                 pfit_control |= (VERT_AUTO_SCALE |
 297                                                  VERT_INTERP_BILINEAR |
 298                                                  HORIZ_AUTO_SCALE |
 299                                                  HORIZ_INTERP_BILINEAR);
 300                 }
 301                 break;
 302         default:
 303                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 304                 return;
 305         }
 306
 307         /* 965+ wants fuzzy fitting */
 308         /* FIXME: handle multiple panels by failing gracefully */
 309         if (INTEL_INFO(dev)->gen >= 4)
 310                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 311                                  PFIT_FILTER_FUZZY);
 312
 313 out:
 314         if ((pfit_control & PFIT_ENABLE) == 0) {
 315                 pfit_control = 0;
 316                 pfit_pgm_ratios = 0;
 317         }
 318
 319         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 320         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 321                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 322
 323         pipe_config->gmch_pfit.control = pfit_control;
 324         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 325         pipe_config->gmch_pfit.lvds_border_bits = border;
 326 }
 327
 328 static int is_backlight_combination_mode(struct drm_device *dev)
 329 {
 330         struct drm_i915_private *dev_priv = dev->dev_private;
 331
 332         if (IS_GEN4(dev))
 333                 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
 334
 335         if (IS_GEN2(dev))
 336                 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
 337
 338         return 0;
 339 }
 340
 341 static u32 pch_get_max_backlight(struct intel_connector *connector)
 342 {
 343         struct drm_device *dev = connector->base.dev;
 344         struct drm_i915_private *dev_priv = dev->dev_private;
 345         u32 val;
 346
 347         val = I915_READ(BLC_PWM_PCH_CTL2);
 348         if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
 349                 dev_priv->regfile.saveBLC_PWM_CTL2 = val;
 350         } else if (val == 0) {
 351                 val = dev_priv->regfile.saveBLC_PWM_CTL2;
 352                 I915_WRITE(BLC_PWM_PCH_CTL2, val);
 353         }
 354
 355         val >>= 16;
 356
 357         return val;
 358 }
 359
 360 static u32 i9xx_get_max_backlight(struct intel_connector *connector)
 361 {
 362         struct drm_device *dev = connector->base.dev;
 363         struct drm_i915_private *dev_priv = dev->dev_private;
 364         u32 val;
 365
 366         val = I915_READ(BLC_PWM_CTL);
 367         if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 368                 dev_priv->regfile.saveBLC_PWM_CTL = val;
 369         } else if (val == 0) {
 370                 val = dev_priv->regfile.saveBLC_PWM_CTL;
 371                 I915_WRITE(BLC_PWM_CTL, val);
 372         }
 373
 374         val >>= 17;
 375
 376         if (is_backlight_combination_mode(dev))
 377                 val *= 0xff;
 378
 379         return val;
 380 }
 381
 382 static u32 i965_get_max_backlight(struct intel_connector *connector)
 383 {
 384         struct drm_device *dev = connector->base.dev;
 385         struct drm_i915_private *dev_priv = dev->dev_private;
 386         u32 val;
 387
 388         val = I915_READ(BLC_PWM_CTL);
 389         if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 390                 dev_priv->regfile.saveBLC_PWM_CTL = val;
 391                 dev_priv->regfile.saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 392         } else if (val == 0) {
 393                 val = dev_priv->regfile.saveBLC_PWM_CTL;
 394                 I915_WRITE(BLC_PWM_CTL, val);
 395                 I915_WRITE(BLC_PWM_CTL2, dev_priv->regfile.saveBLC_PWM_CTL2);
 396         }
 397
 398         val >>= 16;
 399
 400         if (is_backlight_combination_mode(dev))
 401                 val *= 0xff;
 402
 403         return val;
 404 }
 405
 406 static u32 _vlv_get_max_backlight(struct drm_device *dev, enum pipe pipe)
 407 {
 408         struct drm_i915_private *dev_priv = dev->dev_private;
 409         u32 val;
 410
 411         val = I915_READ(VLV_BLC_PWM_CTL(pipe));
 412         if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 413                 dev_priv->regfile.saveBLC_PWM_CTL = val;
 414                 dev_priv->regfile.saveBLC_PWM_CTL2 =
 415                         I915_READ(VLV_BLC_PWM_CTL2(pipe));
 416         } else if (val == 0) {
 417                 val = dev_priv->regfile.saveBLC_PWM_CTL;
 418                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), val);
 419                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe),
 420                            dev_priv->regfile.saveBLC_PWM_CTL2);
 421         }
 422
 423         if (!val)
 424                 val = 0x0f42ffff;
 425
 426         val >>= 16;
 427
 428         return val;
 429 }
 430
 431 static u32 vlv_get_max_backlight(struct intel_connector *connector)
 432 {
 433         struct drm_device *dev = connector->base.dev;
 434         enum pipe pipe = intel_get_pipe_from_connector(connector);
 435
 436         return _vlv_get_max_backlight(dev, pipe);
 437 }
 438
 439 static u32 intel_panel_get_max_backlight(struct intel_connector *connector)
 440 {
 441         struct drm_device *dev = connector->base.dev;
 442         struct drm_i915_private *dev_priv = dev->dev_private;
 443         u32 max;
 444
 445         WARN_ON_SMP(!spin_is_locked(&dev_priv->backlight_lock));
 446
 447         max = dev_priv->display.get_max_backlight(connector);
 448
 449         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 450
 451         return max;
 452 }
 453
 454 static int i915_panel_invert_brightness;
 455 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 456         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 457         "report PCI device ID, subsystem vendor and subsystem device ID "
 458         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 459         "It will then be included in an upcoming module version.");
 460 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 461 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 462                                           u32 val)
 463 {
 464         struct drm_device *dev = connector->base.dev;
 465         struct drm_i915_private *dev_priv = dev->dev_private;
 466         struct intel_panel *panel = &connector->panel;
 467
 468         WARN_ON(panel->backlight.max == 0);
 469
 470         if (i915_panel_invert_brightness < 0)
 471                 return val;
 472
 473         if (i915_panel_invert_brightness > 0 ||
 474             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 475                 return panel->backlight.max - val;
 476         }
 477
 478         return val;
 479 }
 480
 481 static u32 pch_get_backlight(struct intel_connector *connector)
 482 {
 483         struct drm_device *dev = connector->base.dev;
 484         struct drm_i915_private *dev_priv = dev->dev_private;
 485
 486         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 487 }
 488
 489 static u32 i9xx_get_backlight(struct intel_connector *connector)
 490 {
 491         struct drm_device *dev = connector->base.dev;
 492         struct drm_i915_private *dev_priv = dev->dev_private;
 493         struct intel_panel *panel = &connector->panel;
 494         u32 val;
 495
 496         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 497         if (INTEL_INFO(dev)->gen < 4)
 498                 val >>= 1;
 499
 500         if (panel->backlight.combination_mode) {
 501                 u8 lbpc;
 502
 503                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 504                 val *= lbpc;
 505         }
 506
 507         return val;
 508 }
 509
 510 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 511 {
 512         struct drm_i915_private *dev_priv = dev->dev_private;
 513
 514         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 515 }
 516
 517 static u32 vlv_get_backlight(struct intel_connector *connector)
 518 {
 519         struct drm_device *dev = connector->base.dev;
 520         enum pipe pipe = intel_get_pipe_from_connector(connector);
 521
 522         return _vlv_get_backlight(dev, pipe);
 523 }
 524
 525 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 526 {
 527         struct drm_device *dev = connector->base.dev;
 528         struct drm_i915_private *dev_priv = dev->dev_private;
 529         u32 val;
 530         unsigned long flags;
 531
 532         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 533
 534         val = dev_priv->display.get_backlight(connector);
 535         val = intel_panel_compute_brightness(connector, val);
 536
 537         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 538
 539         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 540         return val;
 541 }
 542
 543 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 544 {
 545         struct drm_device *dev = connector->base.dev;
 546         struct drm_i915_private *dev_priv = dev->dev_private;
 547         u32 tmp;
 548
 549         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 550         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 551 }
 552
 553 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 554 {
 555         struct drm_device *dev = connector->base.dev;
 556         struct drm_i915_private *dev_priv = dev->dev_private;
 557         struct intel_panel *panel = &connector->panel;
 558         u32 tmp, mask;
 559
 560         WARN_ON(panel->backlight.max == 0);
 561
 562         if (panel->backlight.combination_mode) {
 563                 u8 lbpc;
 564
 565                 lbpc = level * 0xfe / panel->backlight.max + 1;
 566                 level /= lbpc;
 567                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 568         }
 569
 570         if (IS_GEN4(dev)) {
 571                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 572         } else {
 573                 level <<= 1;
 574                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 575         }
 576
 577         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 578         I915_WRITE(BLC_PWM_CTL, tmp | level);
 579 }
 580
 581 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 582 {
 583         struct drm_device *dev = connector->base.dev;
 584         struct drm_i915_private *dev_priv = dev->dev_private;
 585         enum pipe pipe = intel_get_pipe_from_connector(connector);
 586         u32 tmp;
 587
 588         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 589         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 590 }
 591
 592 static void
 593 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 594 {
 595         struct drm_device *dev = connector->base.dev;
 596         struct drm_i915_private *dev_priv = dev->dev_private;
 597
 598         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 599
 600         level = intel_panel_compute_brightness(connector, level);
 601         dev_priv->display.set_backlight(connector, level);
 602 }
 603
 604 /* set backlight brightness to level in range [0..max] */
 605 void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
 606                                u32 max)
 607 {
 608         struct drm_device *dev = connector->base.dev;
 609         struct drm_i915_private *dev_priv = dev->dev_private;
 610         struct intel_panel *panel = &connector->panel;
 611         enum pipe pipe = intel_get_pipe_from_connector(connector);
 612         u32 freq;
 613         unsigned long flags;
 614
 615         if (pipe == INVALID_PIPE)
 616                 return;
 617
 618         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 619
 620         WARN_ON(panel->backlight.max == 0);
 621
 622         /* scale to hardware max, but be careful to not overflow */
 623         freq = panel->backlight.max;
 624         if (freq < max)
 625                 level = level * freq / max;
 626         else
 627                 level = freq / max * level;
 628
 629         panel->backlight.level = level;
 630         if (panel->backlight.device)
 631                 panel->backlight.device->props.brightness = level;
 632
 633         if (panel->backlight.enabled)
 634                 intel_panel_actually_set_backlight(connector, level);
 635
 636         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 637 }
 638
 639 static void pch_disable_backlight(struct intel_connector *connector)
 640 {
 641         struct drm_device *dev = connector->base.dev;
 642         struct drm_i915_private *dev_priv = dev->dev_private;
 643         u32 tmp;
 644
 645         intel_panel_actually_set_backlight(connector, 0);
 646
 647         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 648         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 649
 650         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 651         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 652 }
 653
 654 static void i9xx_disable_backlight(struct intel_connector *connector)
 655 {
 656         intel_panel_actually_set_backlight(connector, 0);
 657 }
 658
 659 static void i965_disable_backlight(struct intel_connector *connector)
 660 {
 661         struct drm_device *dev = connector->base.dev;
 662         struct drm_i915_private *dev_priv = dev->dev_private;
 663         u32 tmp;
 664
 665         intel_panel_actually_set_backlight(connector, 0);
 666
 667         tmp = I915_READ(BLC_PWM_CTL2);
 668         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 669 }
 670
 671 static void vlv_disable_backlight(struct intel_connector *connector)
 672 {
 673         struct drm_device *dev = connector->base.dev;
 674         struct drm_i915_private *dev_priv = dev->dev_private;
 675         enum pipe pipe = intel_get_pipe_from_connector(connector);
 676         u32 tmp;
 677
 678         intel_panel_actually_set_backlight(connector, 0);
 679
 680         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 681         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 682 }
 683
 684 void intel_panel_disable_backlight(struct intel_connector *connector)
 685 {
 686         struct drm_device *dev = connector->base.dev;
 687         struct drm_i915_private *dev_priv = dev->dev_private;
 688         struct intel_panel *panel = &connector->panel;
 689         enum pipe pipe = intel_get_pipe_from_connector(connector);
 690         unsigned long flags;
 691
 692         if (pipe == INVALID_PIPE)
 693                 return;
 694
 695         /*
 696          * Do not disable backlight on the vgaswitcheroo path. When switching
 697          * away from i915, the other client may depend on i915 to handle the
 698          * backlight. This will leave the backlight on unnecessarily when
 699          * another client is not activated.
 700          */
 701         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 702                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 703                 return;
 704         }
 705
 706         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 707
 708         panel->backlight.enabled = false;
 709         dev_priv->display.disable_backlight(connector);
 710
 711         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 712 }
 713
 714 static void pch_enable_backlight(struct intel_connector *connector)
 715 {
 716         struct drm_device *dev = connector->base.dev;
 717         struct drm_i915_private *dev_priv = dev->dev_private;
 718         struct intel_panel *panel = &connector->panel;
 719         enum pipe pipe = intel_get_pipe_from_connector(connector);
 720         enum transcoder cpu_transcoder =
 721                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 722         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 723
 724         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 725         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 726                 WARN(1, "cpu backlight already enabled\n");
 727                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 728                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 729         }
 730
 731         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 732         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 733                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 734                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 735                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 736         }
 737
 738         if (cpu_transcoder == TRANSCODER_EDP)
 739                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 740         else
 741                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 742         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 743         POSTING_READ(BLC_PWM_CPU_CTL2);
 744         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 745
 746         /* This won't stick until the above enable. */
 747         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 748
 749         pch_ctl2 = panel->backlight.max << 16;
 750         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 751
 752         /* XXX: transitional */
 753         if (dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)
 754                 return;
 755
 756         pch_ctl1 = 0;
 757         if (panel->backlight.active_low_pwm)
 758                 pch_ctl1 |= BLM_PCH_POLARITY;
 759         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 760         POSTING_READ(BLC_PWM_PCH_CTL1);
 761         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 762 }
 763
 764 static void i9xx_enable_backlight(struct intel_connector *connector)
 765 {
 766         struct drm_device *dev = connector->base.dev;
 767         struct drm_i915_private *dev_priv = dev->dev_private;
 768         struct intel_panel *panel = &connector->panel;
 769         u32 ctl, freq;
 770
 771         ctl = I915_READ(BLC_PWM_CTL);
 772         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 773                 WARN(1, "backlight already enabled\n");
 774                 I915_WRITE(BLC_PWM_CTL, 0);
 775         }
 776
 777         freq = panel->backlight.max;
 778         if (panel->backlight.combination_mode)
 779                 freq /= 0xff;
 780
 781         ctl = freq << 17;
 782         if (IS_GEN2(dev) && panel->backlight.combination_mode)
 783                 ctl |= BLM_LEGACY_MODE;
 784         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 785                 ctl |= BLM_POLARITY_PNV;
 786
 787         I915_WRITE(BLC_PWM_CTL, ctl);
 788         POSTING_READ(BLC_PWM_CTL);
 789
 790         /* XXX: combine this into above write? */
 791         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 792 }
 793
 794 static void i965_enable_backlight(struct intel_connector *connector)
 795 {
 796         struct drm_device *dev = connector->base.dev;
 797         struct drm_i915_private *dev_priv = dev->dev_private;
 798         struct intel_panel *panel = &connector->panel;
 799         enum pipe pipe = intel_get_pipe_from_connector(connector);
 800         u32 ctl, ctl2, freq;
 801
 802         ctl2 = I915_READ(BLC_PWM_CTL2);
 803         if (ctl2 & BLM_PWM_ENABLE) {
 804                 WARN(1, "backlight already enabled\n");
 805                 ctl2 &= ~BLM_PWM_ENABLE;
 806                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 807         }
 808
 809         freq = panel->backlight.max;
 810         if (panel->backlight.combination_mode)
 811                 freq /= 0xff;
 812
 813         ctl = freq << 16;
 814         I915_WRITE(BLC_PWM_CTL, ctl);
 815
 816         /* XXX: combine this into above write? */
 817         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 818
 819         ctl2 = BLM_PIPE(pipe);
 820         if (panel->backlight.combination_mode)
 821                 ctl2 |= BLM_COMBINATION_MODE;
 822         if (panel->backlight.active_low_pwm)
 823                 ctl2 |= BLM_POLARITY_I965;
 824         I915_WRITE(BLC_PWM_CTL2, ctl2);
 825         POSTING_READ(BLC_PWM_CTL2);
 826         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 827 }
 828
 829 static void vlv_enable_backlight(struct intel_connector *connector)
 830 {
 831         struct drm_device *dev = connector->base.dev;
 832         struct drm_i915_private *dev_priv = dev->dev_private;
 833         struct intel_panel *panel = &connector->panel;
 834         enum pipe pipe = intel_get_pipe_from_connector(connector);
 835         u32 ctl, ctl2;
 836
 837         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 838         if (ctl2 & BLM_PWM_ENABLE) {
 839                 WARN(1, "backlight already enabled\n");
 840                 ctl2 &= ~BLM_PWM_ENABLE;
 841                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 842         }
 843
 844         ctl = panel->backlight.max << 16;
 845         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 846
 847         /* XXX: combine this into above write? */
 848         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 849
 850         ctl2 = 0;
 851         if (panel->backlight.active_low_pwm)
 852                 ctl2 |= BLM_POLARITY_I965;
 853         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 854         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 855         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 856 }
 857
 858 void intel_panel_enable_backlight(struct intel_connector *connector)
 859 {
 860         struct drm_device *dev = connector->base.dev;
 861         struct drm_i915_private *dev_priv = dev->dev_private;
 862         struct intel_panel *panel = &connector->panel;
 863         enum pipe pipe = intel_get_pipe_from_connector(connector);
 864         unsigned long flags;
 865
 866         if (pipe == INVALID_PIPE)
 867                 return;
 868
 869         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 870
 871         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 872
 873         /* XXX: transitional, call to make sure freq is set */
 874         intel_panel_get_max_backlight(connector);
 875
 876         WARN_ON(panel->backlight.max == 0);
 877
 878         if (panel->backlight.level == 0) {
 879                 panel->backlight.level = panel->backlight.max;
 880                 if (panel->backlight.device)
 881                         panel->backlight.device->props.brightness =
 882                                 panel->backlight.level;
 883         }
 884
 885         dev_priv->display.enable_backlight(connector);
 886         panel->backlight.enabled = true;
 887
 888         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 889 }
 890
 891 enum drm_connector_status
 892 intel_panel_detect(struct drm_device *dev)
 893 {
 894         struct drm_i915_private *dev_priv = dev->dev_private;
 895
 896         /* Assume that the BIOS does not lie through the OpRegion... */
 897         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
 898                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 899                         connector_status_connected :
 900                         connector_status_disconnected;
 901         }
 902
 903         switch (i915_panel_ignore_lid) {
 904         case -2:
 905                 return connector_status_connected;
 906         case -1:
 907                 return connector_status_disconnected;
 908         default:
 909                 return connector_status_unknown;
 910         }
 911 }
 912
 913 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 914 static int intel_backlight_device_update_status(struct backlight_device *bd)
 915 {
 916         struct intel_connector *connector = bl_get_data(bd);
 917         struct drm_device *dev = connector->base.dev;
 918
 919         mutex_lock(&dev->mode_config.mutex);
 920         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 921                       bd->props.brightness, bd->props.max_brightness);
 922         intel_panel_set_backlight(connector, bd->props.brightness,
 923                                   bd->props.max_brightness);
 924         mutex_unlock(&dev->mode_config.mutex);
 925         return 0;
 926 }
 927
 928 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 929 {
 930         struct intel_connector *connector = bl_get_data(bd);
 931         struct drm_device *dev = connector->base.dev;
 932         int ret;
 933
 934         mutex_lock(&dev->mode_config.mutex);
 935         ret = intel_panel_get_backlight(connector);
 936         mutex_unlock(&dev->mode_config.mutex);
 937
 938         return ret;
 939 }
 940
 941 static const struct backlight_ops intel_backlight_device_ops = {
 942         .update_status = intel_backlight_device_update_status,
 943         .get_brightness = intel_backlight_device_get_brightness,
 944 };
 945
 946 static int intel_backlight_device_register(struct intel_connector *connector)
 947 {
 948         struct intel_panel *panel = &connector->panel;
 949         struct backlight_properties props;
 950
 951         if (WARN_ON(panel->backlight.device))
 952                 return -ENODEV;
 953
 954         BUG_ON(panel->backlight.max == 0);
 955
 956         memset(&props, 0, sizeof(props));
 957         props.type = BACKLIGHT_RAW;
 958         props.brightness = panel->backlight.level;
 959         props.max_brightness = panel->backlight.max;
 960
 961         /*
 962          * Note: using the same name independent of the connector prevents
 963          * registration of multiple backlight devices in the driver.
 964          */
 965         panel->backlight.device =
 966                 backlight_device_register("intel_backlight",
 967                                           connector->base.kdev,
 968                                           connector,
 969                                           &intel_backlight_device_ops, &props);
 970
 971         if (IS_ERR(panel->backlight.device)) {
 972                 DRM_ERROR("Failed to register backlight: %ld\n",
 973                           PTR_ERR(panel->backlight.device));
 974                 panel->backlight.device = NULL;
 975                 return -ENODEV;
 976         }
 977         return 0;
 978 }
 979
 980 static void intel_backlight_device_unregister(struct intel_connector *connector)
 981 {
 982         struct intel_panel *panel = &connector->panel;
 983
 984         if (panel->backlight.device) {
 985                 backlight_device_unregister(panel->backlight.device);
 986                 panel->backlight.device = NULL;
 987         }
 988 }
 989 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 990 static int intel_backlight_device_register(struct intel_connector *connector)
 991 {
 992         return 0;
 993 }
 994 static void intel_backlight_device_unregister(struct intel_connector *connector)
 995 {
 996 }
 997 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 998
 999 /*
1000  * Note: The setup hooks can't assume pipe is set!
1001  *
1002  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1003  * appropriately when it's 0. Use VBT and/or sane defaults.
1004  */
1005 static int pch_setup_backlight(struct intel_connector *connector)
1006 {
1007         struct drm_device *dev = connector->base.dev;
1008         struct drm_i915_private *dev_priv = dev->dev_private;
1009         struct intel_panel *panel = &connector->panel;
1010         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1011
1012         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1013         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1014
1015         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1016         panel->backlight.max = pch_ctl2 >> 16;
1017         if (!panel->backlight.max)
1018                 return -ENODEV;
1019
1020         val = pch_get_backlight(connector);
1021         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1022
1023         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1024         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1025                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1026
1027         return 0;
1028 }
1029
1030 static int i9xx_setup_backlight(struct intel_connector *connector)
1031 {
1032         struct drm_device *dev = connector->base.dev;
1033         struct drm_i915_private *dev_priv = dev->dev_private;
1034         struct intel_panel *panel = &connector->panel;
1035         u32 ctl, val;
1036
1037         ctl = I915_READ(BLC_PWM_CTL);
1038
1039         if (IS_GEN2(dev))
1040                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1041
1042         if (IS_PINEVIEW(dev))
1043                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1044
1045         panel->backlight.max = ctl >> 17;
1046         if (panel->backlight.combination_mode)
1047                 panel->backlight.max *= 0xff;
1048
1049         if (!panel->backlight.max)
1050                 return -ENODEV;
1051
1052         val = i9xx_get_backlight(connector);
1053         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1054
1055         panel->backlight.enabled = panel->backlight.level != 0;
1056
1057         return 0;
1058 }
1059
1060 static int i965_setup_backlight(struct intel_connector *connector)
1061 {
1062         struct drm_device *dev = connector->base.dev;
1063         struct drm_i915_private *dev_priv = dev->dev_private;
1064         struct intel_panel *panel = &connector->panel;
1065         u32 ctl, ctl2, val;
1066
1067         ctl2 = I915_READ(BLC_PWM_CTL2);
1068         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1069         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1070
1071         ctl = I915_READ(BLC_PWM_CTL);
1072         panel->backlight.max = ctl >> 16;
1073         if (panel->backlight.combination_mode)
1074                 panel->backlight.max *= 0xff;
1075
1076         if (!panel->backlight.max)
1077                 return -ENODEV;
1078
1079         val = i9xx_get_backlight(connector);
1080         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1081
1082         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1083                 panel->backlight.level != 0;
1084
1085         return 0;
1086 }
1087
1088 static int vlv_setup_backlight(struct intel_connector *connector)
1089 {
1090         struct drm_device *dev = connector->base.dev;
1091         struct drm_i915_private *dev_priv = dev->dev_private;
1092         struct intel_panel *panel = &connector->panel;
1093         enum pipe pipe;
1094         u32 ctl, ctl2, val;
1095
1096         for_each_pipe(pipe) {
1097                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1098
1099                 /* Skip if the modulation freq is already set */
1100                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1101                         continue;
1102
1103                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1104                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1105                            cur_val);
1106         }
1107
1108         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
1109         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1110
1111         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
1112         panel->backlight.max = ctl >> 16;
1113         if (!panel->backlight.max)
1114                 return -ENODEV;
1115
1116         val = _vlv_get_backlight(dev, PIPE_A);
1117         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1118
1119         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1120                 panel->backlight.level != 0;
1121
1122         return 0;
1123 }
1124
1125 int intel_panel_setup_backlight(struct drm_connector *connector)
1126 {
1127         struct drm_device *dev = connector->dev;
1128         struct drm_i915_private *dev_priv = dev->dev_private;
1129         struct intel_connector *intel_connector = to_intel_connector(connector);
1130         struct intel_panel *panel = &intel_connector->panel;
1131         unsigned long flags;
1132         int ret;
1133
1134         /* set level and max in panel struct */
1135         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
1136         ret = dev_priv->display.setup_backlight(intel_connector);
1137         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
1138
1139         if (ret) {
1140                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1141                               drm_get_connector_name(connector));
1142                 return ret;
1143         }
1144
1145         intel_backlight_device_register(intel_connector);
1146
1147         panel->backlight.present = true;
1148
1149         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1150                       "sysfs interface %sregistered\n",
1151                       panel->backlight.enabled ? "enabled" : "disabled",
1152                       panel->backlight.level, panel->backlight.max,
1153                       panel->backlight.device ? "" : "not ");
1154
1155         return 0;
1156 }
1157
1158 void intel_panel_destroy_backlight(struct drm_connector *connector)
1159 {
1160         struct intel_connector *intel_connector = to_intel_connector(connector);
1161         struct intel_panel *panel = &intel_connector->panel;
1162
1163         panel->backlight.present = false;
1164         intel_backlight_device_unregister(intel_connector);
1165 }
1166
1167 /* Set up chip specific backlight functions */
1168 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1169 {
1170         struct drm_i915_private *dev_priv = dev->dev_private;
1171
1172         if (HAS_PCH_SPLIT(dev)) {
1173                 dev_priv->display.setup_backlight = pch_setup_backlight;
1174                 dev_priv->display.enable_backlight = pch_enable_backlight;
1175                 dev_priv->display.disable_backlight = pch_disable_backlight;
1176                 dev_priv->display.set_backlight = pch_set_backlight;
1177                 dev_priv->display.get_backlight = pch_get_backlight;
1178                 dev_priv->display.get_max_backlight = pch_get_max_backlight;
1179         } else if (IS_VALLEYVIEW(dev)) {
1180                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1181                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1182                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1183                 dev_priv->display.set_backlight = vlv_set_backlight;
1184                 dev_priv->display.get_backlight = vlv_get_backlight;
1185                 dev_priv->display.get_max_backlight = vlv_get_max_backlight;
1186         } else if (IS_GEN4(dev)) {
1187                 dev_priv->display.setup_backlight = i965_setup_backlight;
1188                 dev_priv->display.enable_backlight = i965_enable_backlight;
1189                 dev_priv->display.disable_backlight = i965_disable_backlight;
1190                 dev_priv->display.set_backlight = i9xx_set_backlight;
1191                 dev_priv->display.get_backlight = i9xx_get_backlight;
1192                 dev_priv->display.get_max_backlight = i965_get_max_backlight;
1193         } else {
1194                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1195                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1196                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1197                 dev_priv->display.set_backlight = i9xx_set_backlight;
1198                 dev_priv->display.get_backlight = i9xx_get_backlight;
1199                 dev_priv->display.get_max_backlight = i9xx_get_max_backlight;
1200         }
1201 }
1202
1203 int intel_panel_init(struct intel_panel *panel,
1204                      struct drm_display_mode *fixed_mode)
1205 {
1206         panel->fixed_mode = fixed_mode;
1207
1208         return 0;
1209 }
1210
1211 void intel_panel_fini(struct intel_panel *panel)
1212 {
1213         struct intel_connector *intel_connector =
1214                 container_of(panel, struct intel_connector, panel);
1215
1216         if (panel->fixed_mode)
1217                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1218 }