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/kernel.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/pwm.h>
  36 #include "intel_drv.h"
  37
  38 #define CRC_PMIC_PWM_PERIOD_NS  21333
  39
  40 void
  41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  42                        struct drm_display_mode *adjusted_mode)
  43 {
  44         drm_mode_copy(adjusted_mode, fixed_mode);
  45
  46         drm_mode_set_crtcinfo(adjusted_mode, 0);
  47 }
  48
  49 /**
  50  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  51  * @dev: drm device
  52  * @fixed_mode : panel native mode
  53  * @connector: LVDS/eDP connector
  54  *
  55  * Return downclock_avail
  56  * Find the reduced downclock for LVDS/eDP in EDID.
  57  */
  58 struct drm_display_mode *
  59 intel_find_panel_downclock(struct drm_device *dev,
  60                         struct drm_display_mode *fixed_mode,
  61                         struct drm_connector *connector)
  62 {
  63         struct drm_display_mode *scan, *tmp_mode;
  64         int temp_downclock;
  65
  66         temp_downclock = fixed_mode->clock;
  67         tmp_mode = NULL;
  68
  69         list_for_each_entry(scan, &connector->probed_modes, head) {
  70                 /*
  71                  * If one mode has the same resolution with the fixed_panel
  72                  * mode while they have the different refresh rate, it means
  73                  * that the reduced downclock is found. In such
  74                  * case we can set the different FPx0/1 to dynamically select
  75                  * between low and high frequency.
  76                  */
  77                 if (scan->hdisplay == fixed_mode->hdisplay &&
  78                     scan->hsync_start == fixed_mode->hsync_start &&
  79                     scan->hsync_end == fixed_mode->hsync_end &&
  80                     scan->htotal == fixed_mode->htotal &&
  81                     scan->vdisplay == fixed_mode->vdisplay &&
  82                     scan->vsync_start == fixed_mode->vsync_start &&
  83                     scan->vsync_end == fixed_mode->vsync_end &&
  84                     scan->vtotal == fixed_mode->vtotal) {
  85                         if (scan->clock < temp_downclock) {
  86                                 /*
  87                                  * The downclock is already found. But we
  88                                  * expect to find the lower downclock.
  89                                  */
  90                                 temp_downclock = scan->clock;
  91                                 tmp_mode = scan;
  92                         }
  93                 }
  94         }
  95
  96         if (temp_downclock < fixed_mode->clock)
  97                 return drm_mode_duplicate(dev, tmp_mode);
  98         else
  99                 return NULL;
 100 }
 101
 102 /* adjusted_mode has been preset to be the panel's fixed mode */
 103 void
 104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 105                         struct intel_crtc_state *pipe_config,
 106                         int fitting_mode)
 107 {
 108         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 109         int x = 0, y = 0, width = 0, height = 0;
 110
 111         /* Native modes don't need fitting */
 112         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 113             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 114                 goto done;
 115
 116         switch (fitting_mode) {
 117         case DRM_MODE_SCALE_CENTER:
 118                 width = pipe_config->pipe_src_w;
 119                 height = pipe_config->pipe_src_h;
 120                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 121                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 122                 break;
 123
 124         case DRM_MODE_SCALE_ASPECT:
 125                 /* Scale but preserve the aspect ratio */
 126                 {
 127                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 128                                 * pipe_config->pipe_src_h;
 129                         u32 scaled_height = pipe_config->pipe_src_w
 130                                 * adjusted_mode->crtc_vdisplay;
 131                         if (scaled_width > scaled_height) { /* pillar */
 132                                 width = scaled_height / pipe_config->pipe_src_h;
 133                                 if (width & 1)
 134                                         width++;
 135                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 136                                 y = 0;
 137                                 height = adjusted_mode->crtc_vdisplay;
 138                         } else if (scaled_width < scaled_height) { /* letter */
 139                                 height = scaled_width / pipe_config->pipe_src_w;
 140                                 if (height & 1)
 141                                     height++;
 142                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 143                                 x = 0;
 144                                 width = adjusted_mode->crtc_hdisplay;
 145                         } else {
 146                                 x = y = 0;
 147                                 width = adjusted_mode->crtc_hdisplay;
 148                                 height = adjusted_mode->crtc_vdisplay;
 149                         }
 150                 }
 151                 break;
 152
 153         case DRM_MODE_SCALE_FULLSCREEN:
 154                 x = y = 0;
 155                 width = adjusted_mode->crtc_hdisplay;
 156                 height = adjusted_mode->crtc_vdisplay;
 157                 break;
 158
 159         default:
 160                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 161                 return;
 162         }
 163
 164 done:
 165         pipe_config->pch_pfit.pos = (x << 16) | y;
 166         pipe_config->pch_pfit.size = (width << 16) | height;
 167         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 168 }
 169
 170 static void
 171 centre_horizontally(struct drm_display_mode *adjusted_mode,
 172                     int width)
 173 {
 174         u32 border, sync_pos, blank_width, sync_width;
 175
 176         /* keep the hsync and hblank widths constant */
 177         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 178         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 179         sync_pos = (blank_width - sync_width + 1) / 2;
 180
 181         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 182         border += border & 1; /* make the border even */
 183
 184         adjusted_mode->crtc_hdisplay = width;
 185         adjusted_mode->crtc_hblank_start = width + border;
 186         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 187
 188         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 189         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 190 }
 191
 192 static void
 193 centre_vertically(struct drm_display_mode *adjusted_mode,
 194                   int height)
 195 {
 196         u32 border, sync_pos, blank_width, sync_width;
 197
 198         /* keep the vsync and vblank widths constant */
 199         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 200         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 201         sync_pos = (blank_width - sync_width + 1) / 2;
 202
 203         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 204
 205         adjusted_mode->crtc_vdisplay = height;
 206         adjusted_mode->crtc_vblank_start = height + border;
 207         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 208
 209         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 210         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 211 }
 212
 213 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 214 {
 215         /*
 216          * Floating point operation is not supported. So the FACTOR
 217          * is defined, which can avoid the floating point computation
 218          * when calculating the panel ratio.
 219          */
 220 #define ACCURACY 12
 221 #define FACTOR (1 << ACCURACY)
 222         u32 ratio = source * FACTOR / target;
 223         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 224 }
 225
 226 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 227                               u32 *pfit_control)
 228 {
 229         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 230         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 231                 pipe_config->pipe_src_h;
 232         u32 scaled_height = pipe_config->pipe_src_w *
 233                 adjusted_mode->crtc_vdisplay;
 234
 235         /* 965+ is easy, it does everything in hw */
 236         if (scaled_width > scaled_height)
 237                 *pfit_control |= PFIT_ENABLE |
 238                         PFIT_SCALING_PILLAR;
 239         else if (scaled_width < scaled_height)
 240                 *pfit_control |= PFIT_ENABLE |
 241                         PFIT_SCALING_LETTER;
 242         else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 243                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 244 }
 245
 246 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 247                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 248                               u32 *border)
 249 {
 250         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 251         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 252                 pipe_config->pipe_src_h;
 253         u32 scaled_height = pipe_config->pipe_src_w *
 254                 adjusted_mode->crtc_vdisplay;
 255         u32 bits;
 256
 257         /*
 258          * For earlier chips we have to calculate the scaling
 259          * ratio by hand and program it into the
 260          * PFIT_PGM_RATIO register
 261          */
 262         if (scaled_width > scaled_height) { /* pillar */
 263                 centre_horizontally(adjusted_mode,
 264                                     scaled_height /
 265                                     pipe_config->pipe_src_h);
 266
 267                 *border = LVDS_BORDER_ENABLE;
 268                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 269                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 270                                                     adjusted_mode->crtc_vdisplay);
 271
 272                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 273                                              bits << PFIT_VERT_SCALE_SHIFT);
 274                         *pfit_control |= (PFIT_ENABLE |
 275                                           VERT_INTERP_BILINEAR |
 276                                           HORIZ_INTERP_BILINEAR);
 277                 }
 278         } else if (scaled_width < scaled_height) { /* letter */
 279                 centre_vertically(adjusted_mode,
 280                                   scaled_width /
 281                                   pipe_config->pipe_src_w);
 282
 283                 *border = LVDS_BORDER_ENABLE;
 284                 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 285                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 286                                                     adjusted_mode->crtc_hdisplay);
 287
 288                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 289                                              bits << PFIT_VERT_SCALE_SHIFT);
 290                         *pfit_control |= (PFIT_ENABLE |
 291                                           VERT_INTERP_BILINEAR |
 292                                           HORIZ_INTERP_BILINEAR);
 293                 }
 294         } else {
 295                 /* Aspects match, Let hw scale both directions */
 296                 *pfit_control |= (PFIT_ENABLE |
 297                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 298                                   VERT_INTERP_BILINEAR |
 299                                   HORIZ_INTERP_BILINEAR);
 300         }
 301 }
 302
 303 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 304                               struct intel_crtc_state *pipe_config,
 305                               int fitting_mode)
 306 {
 307         struct drm_device *dev = intel_crtc->base.dev;
 308         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 309         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 310
 311         /* Native modes don't need fitting */
 312         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 313             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 314                 goto out;
 315
 316         switch (fitting_mode) {
 317         case DRM_MODE_SCALE_CENTER:
 318                 /*
 319                  * For centered modes, we have to calculate border widths &
 320                  * heights and modify the values programmed into the CRTC.
 321                  */
 322                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 323                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 324                 border = LVDS_BORDER_ENABLE;
 325                 break;
 326         case DRM_MODE_SCALE_ASPECT:
 327                 /* Scale but preserve the aspect ratio */
 328                 if (INTEL_INFO(dev)->gen >= 4)
 329                         i965_scale_aspect(pipe_config, &pfit_control);
 330                 else
 331                         i9xx_scale_aspect(pipe_config, &pfit_control,
 332                                           &pfit_pgm_ratios, &border);
 333                 break;
 334         case DRM_MODE_SCALE_FULLSCREEN:
 335                 /*
 336                  * Full scaling, even if it changes the aspect ratio.
 337                  * Fortunately this is all done for us in hw.
 338                  */
 339                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 340                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 341                         pfit_control |= PFIT_ENABLE;
 342                         if (INTEL_INFO(dev)->gen >= 4)
 343                                 pfit_control |= PFIT_SCALING_AUTO;
 344                         else
 345                                 pfit_control |= (VERT_AUTO_SCALE |
 346                                                  VERT_INTERP_BILINEAR |
 347                                                  HORIZ_AUTO_SCALE |
 348                                                  HORIZ_INTERP_BILINEAR);
 349                 }
 350                 break;
 351         default:
 352                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 353                 return;
 354         }
 355
 356         /* 965+ wants fuzzy fitting */
 357         /* FIXME: handle multiple panels by failing gracefully */
 358         if (INTEL_INFO(dev)->gen >= 4)
 359                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 360                                  PFIT_FILTER_FUZZY);
 361
 362 out:
 363         if ((pfit_control & PFIT_ENABLE) == 0) {
 364                 pfit_control = 0;
 365                 pfit_pgm_ratios = 0;
 366         }
 367
 368         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 369         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 370                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 371
 372         pipe_config->gmch_pfit.control = pfit_control;
 373         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 374         pipe_config->gmch_pfit.lvds_border_bits = border;
 375 }
 376
 377 enum drm_connector_status
 378 intel_panel_detect(struct drm_device *dev)
 379 {
 380         struct drm_i915_private *dev_priv = dev->dev_private;
 381
 382         /* Assume that the BIOS does not lie through the OpRegion... */
 383         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 384                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 385                         connector_status_connected :
 386                         connector_status_disconnected;
 387         }
 388
 389         switch (i915.panel_ignore_lid) {
 390         case -2:
 391                 return connector_status_connected;
 392         case -1:
 393                 return connector_status_disconnected;
 394         default:
 395                 return connector_status_unknown;
 396         }
 397 }
 398
 399 /**
 400  * scale - scale values from one range to another
 401  *
 402  * @source_val: value in range [@source_min..@source_max]
 403  *
 404  * Return @source_val in range [@source_min..@source_max] scaled to range
 405  * [@target_min..@target_max].
 406  */
 407 static uint32_t scale(uint32_t source_val,
 408                       uint32_t source_min, uint32_t source_max,
 409                       uint32_t target_min, uint32_t target_max)
 410 {
 411         uint64_t target_val;
 412
 413         WARN_ON(source_min > source_max);
 414         WARN_ON(target_min > target_max);
 415
 416         /* defensive */
 417         source_val = clamp(source_val, source_min, source_max);
 418
 419         /* avoid overflows */
 420         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 421                         (target_max - target_min), source_max - source_min);
 422         target_val += target_min;
 423
 424         return target_val;
 425 }
 426
 427 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 428 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 429                                    u32 user_level, u32 user_max)
 430 {
 431         struct intel_panel *panel = &connector->panel;
 432
 433         return scale(user_level, 0, user_max,
 434                      panel->backlight.min, panel->backlight.max);
 435 }
 436
 437 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 438  * to [hw_min..hw_max]. */
 439 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 440                                    u32 user_level, u32 user_max)
 441 {
 442         struct intel_panel *panel = &connector->panel;
 443         u32 hw_level;
 444
 445         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 446         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 447
 448         return hw_level;
 449 }
 450
 451 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 452 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 453                                    u32 hw_level, u32 user_max)
 454 {
 455         struct intel_panel *panel = &connector->panel;
 456
 457         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 458                      0, user_max);
 459 }
 460
 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.invert_brightness < 0)
 471                 return val;
 472
 473         if (i915.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 lpt_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_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 487 }
 488
 489 static u32 pch_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
 494         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 495 }
 496
 497 static u32 i9xx_get_backlight(struct intel_connector *connector)
 498 {
 499         struct drm_device *dev = connector->base.dev;
 500         struct drm_i915_private *dev_priv = dev->dev_private;
 501         struct intel_panel *panel = &connector->panel;
 502         u32 val;
 503
 504         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 505         if (INTEL_INFO(dev)->gen < 4)
 506                 val >>= 1;
 507
 508         if (panel->backlight.combination_mode) {
 509                 u8 lbpc;
 510
 511                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 512                 val *= lbpc;
 513         }
 514
 515         return val;
 516 }
 517
 518 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 519 {
 520         struct drm_i915_private *dev_priv = dev->dev_private;
 521
 522         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 523                 return 0;
 524
 525         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 526 }
 527
 528 static u32 vlv_get_backlight(struct intel_connector *connector)
 529 {
 530         struct drm_device *dev = connector->base.dev;
 531         enum pipe pipe = intel_get_pipe_from_connector(connector);
 532
 533         return _vlv_get_backlight(dev, pipe);
 534 }
 535
 536 static u32 bxt_get_backlight(struct intel_connector *connector)
 537 {
 538         struct drm_device *dev = connector->base.dev;
 539         struct drm_i915_private *dev_priv = dev->dev_private;
 540
 541         return I915_READ(BXT_BLC_PWM_DUTY1);
 542 }
 543
 544 static u32 pwm_get_backlight(struct intel_connector *connector)
 545 {
 546         struct intel_panel *panel = &connector->panel;
 547         int duty_ns;
 548
 549         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 550         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 551 }
 552
 553 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 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 val = 0;
 559
 560         mutex_lock(&dev_priv->backlight_lock);
 561
 562         if (panel->backlight.enabled) {
 563                 val = dev_priv->display.get_backlight(connector);
 564                 val = intel_panel_compute_brightness(connector, val);
 565         }
 566
 567         mutex_unlock(&dev_priv->backlight_lock);
 568
 569         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 570         return val;
 571 }
 572
 573 static void lpt_set_backlight(struct intel_connector *connector, u32 level)
 574 {
 575         struct drm_device *dev = connector->base.dev;
 576         struct drm_i915_private *dev_priv = dev->dev_private;
 577         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 578         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 579 }
 580
 581 static void pch_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         u32 tmp;
 586
 587         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 588         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 589 }
 590
 591 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 592 {
 593         struct drm_device *dev = connector->base.dev;
 594         struct drm_i915_private *dev_priv = dev->dev_private;
 595         struct intel_panel *panel = &connector->panel;
 596         u32 tmp, mask;
 597
 598         WARN_ON(panel->backlight.max == 0);
 599
 600         if (panel->backlight.combination_mode) {
 601                 u8 lbpc;
 602
 603                 lbpc = level * 0xfe / panel->backlight.max + 1;
 604                 level /= lbpc;
 605                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 606         }
 607
 608         if (IS_GEN4(dev)) {
 609                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 610         } else {
 611                 level <<= 1;
 612                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 613         }
 614
 615         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 616         I915_WRITE(BLC_PWM_CTL, tmp | level);
 617 }
 618
 619 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 620 {
 621         struct drm_device *dev = connector->base.dev;
 622         struct drm_i915_private *dev_priv = dev->dev_private;
 623         enum pipe pipe = intel_get_pipe_from_connector(connector);
 624         u32 tmp;
 625
 626         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 627                 return;
 628
 629         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 630         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 631 }
 632
 633 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
 634 {
 635         struct drm_device *dev = connector->base.dev;
 636         struct drm_i915_private *dev_priv = dev->dev_private;
 637
 638         I915_WRITE(BXT_BLC_PWM_DUTY1, level);
 639 }
 640
 641 static void pwm_set_backlight(struct intel_connector *connector, u32 level)
 642 {
 643         struct intel_panel *panel = &connector->panel;
 644         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 645
 646         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 647 }
 648
 649 static void
 650 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 651 {
 652         struct drm_device *dev = connector->base.dev;
 653         struct drm_i915_private *dev_priv = dev->dev_private;
 654
 655         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 656
 657         level = intel_panel_compute_brightness(connector, level);
 658         dev_priv->display.set_backlight(connector, level);
 659 }
 660
 661 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 662 static void intel_panel_set_backlight(struct intel_connector *connector,
 663                                       u32 user_level, u32 user_max)
 664 {
 665         struct drm_device *dev = connector->base.dev;
 666         struct drm_i915_private *dev_priv = dev->dev_private;
 667         struct intel_panel *panel = &connector->panel;
 668         u32 hw_level;
 669
 670         if (!panel->backlight.present)
 671                 return;
 672
 673         mutex_lock(&dev_priv->backlight_lock);
 674
 675         WARN_ON(panel->backlight.max == 0);
 676
 677         hw_level = scale_user_to_hw(connector, user_level, user_max);
 678         panel->backlight.level = hw_level;
 679
 680         if (panel->backlight.enabled)
 681                 intel_panel_actually_set_backlight(connector, hw_level);
 682
 683         mutex_unlock(&dev_priv->backlight_lock);
 684 }
 685
 686 /* set backlight brightness to level in range [0..max], assuming hw min is
 687  * respected.
 688  */
 689 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 690                                     u32 user_level, u32 user_max)
 691 {
 692         struct drm_device *dev = connector->base.dev;
 693         struct drm_i915_private *dev_priv = dev->dev_private;
 694         struct intel_panel *panel = &connector->panel;
 695         enum pipe pipe = intel_get_pipe_from_connector(connector);
 696         u32 hw_level;
 697
 698         /*
 699          * INVALID_PIPE may occur during driver init because
 700          * connection_mutex isn't held across the entire backlight
 701          * setup + modeset readout, and the BIOS can issue the
 702          * requests at any time.
 703          */
 704         if (!panel->backlight.present || pipe == INVALID_PIPE)
 705                 return;
 706
 707         mutex_lock(&dev_priv->backlight_lock);
 708
 709         WARN_ON(panel->backlight.max == 0);
 710
 711         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 712         panel->backlight.level = hw_level;
 713
 714         if (panel->backlight.device)
 715                 panel->backlight.device->props.brightness =
 716                         scale_hw_to_user(connector,
 717                                          panel->backlight.level,
 718                                          panel->backlight.device->props.max_brightness);
 719
 720         if (panel->backlight.enabled)
 721                 intel_panel_actually_set_backlight(connector, hw_level);
 722
 723         mutex_unlock(&dev_priv->backlight_lock);
 724 }
 725
 726 static void lpt_disable_backlight(struct intel_connector *connector)
 727 {
 728         struct drm_device *dev = connector->base.dev;
 729         struct drm_i915_private *dev_priv = dev->dev_private;
 730         u32 tmp;
 731
 732         intel_panel_actually_set_backlight(connector, 0);
 733
 734         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 735         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 736 }
 737
 738 static void pch_disable_backlight(struct intel_connector *connector)
 739 {
 740         struct drm_device *dev = connector->base.dev;
 741         struct drm_i915_private *dev_priv = dev->dev_private;
 742         u32 tmp;
 743
 744         intel_panel_actually_set_backlight(connector, 0);
 745
 746         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 747         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 748
 749         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 750         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 751 }
 752
 753 static void i9xx_disable_backlight(struct intel_connector *connector)
 754 {
 755         intel_panel_actually_set_backlight(connector, 0);
 756 }
 757
 758 static void i965_disable_backlight(struct intel_connector *connector)
 759 {
 760         struct drm_device *dev = connector->base.dev;
 761         struct drm_i915_private *dev_priv = dev->dev_private;
 762         u32 tmp;
 763
 764         intel_panel_actually_set_backlight(connector, 0);
 765
 766         tmp = I915_READ(BLC_PWM_CTL2);
 767         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 768 }
 769
 770 static void vlv_disable_backlight(struct intel_connector *connector)
 771 {
 772         struct drm_device *dev = connector->base.dev;
 773         struct drm_i915_private *dev_priv = dev->dev_private;
 774         enum pipe pipe = intel_get_pipe_from_connector(connector);
 775         u32 tmp;
 776
 777         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 778                 return;
 779
 780         intel_panel_actually_set_backlight(connector, 0);
 781
 782         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 783         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 784 }
 785
 786 static void bxt_disable_backlight(struct intel_connector *connector)
 787 {
 788         struct drm_device *dev = connector->base.dev;
 789         struct drm_i915_private *dev_priv = dev->dev_private;
 790         u32 tmp;
 791
 792         intel_panel_actually_set_backlight(connector, 0);
 793
 794         tmp = I915_READ(BXT_BLC_PWM_CTL1);
 795         I915_WRITE(BXT_BLC_PWM_CTL1, tmp & ~BXT_BLC_PWM_ENABLE);
 796 }
 797
 798 static void pwm_disable_backlight(struct intel_connector *connector)
 799 {
 800         struct intel_panel *panel = &connector->panel;
 801
 802         /* Disable the backlight */
 803         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 804         usleep_range(2000, 3000);
 805         pwm_disable(panel->backlight.pwm);
 806 }
 807
 808 void intel_panel_disable_backlight(struct intel_connector *connector)
 809 {
 810         struct drm_device *dev = connector->base.dev;
 811         struct drm_i915_private *dev_priv = dev->dev_private;
 812         struct intel_panel *panel = &connector->panel;
 813
 814         if (!panel->backlight.present)
 815                 return;
 816
 817         /*
 818          * Do not disable backlight on the vga_switcheroo path. When switching
 819          * away from i915, the other client may depend on i915 to handle the
 820          * backlight. This will leave the backlight on unnecessarily when
 821          * another client is not activated.
 822          */
 823         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 824                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 825                 return;
 826         }
 827
 828         mutex_lock(&dev_priv->backlight_lock);
 829
 830         if (panel->backlight.device)
 831                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 832         panel->backlight.enabled = false;
 833         dev_priv->display.disable_backlight(connector);
 834
 835         mutex_unlock(&dev_priv->backlight_lock);
 836 }
 837
 838 static void lpt_enable_backlight(struct intel_connector *connector)
 839 {
 840         struct drm_device *dev = connector->base.dev;
 841         struct drm_i915_private *dev_priv = dev->dev_private;
 842         struct intel_panel *panel = &connector->panel;
 843         u32 pch_ctl1, pch_ctl2;
 844
 845         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 846         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 847                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 848                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 849                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 850         }
 851
 852         pch_ctl2 = panel->backlight.max << 16;
 853         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 854
 855         pch_ctl1 = 0;
 856         if (panel->backlight.active_low_pwm)
 857                 pch_ctl1 |= BLM_PCH_POLARITY;
 858
 859         /* After LPT, override is the default. */
 860         if (HAS_PCH_LPT(dev_priv))
 861                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 862
 863         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 864         POSTING_READ(BLC_PWM_PCH_CTL1);
 865         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 866
 867         /* This won't stick until the above enable. */
 868         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 869 }
 870
 871 static void pch_enable_backlight(struct intel_connector *connector)
 872 {
 873         struct drm_device *dev = connector->base.dev;
 874         struct drm_i915_private *dev_priv = dev->dev_private;
 875         struct intel_panel *panel = &connector->panel;
 876         enum pipe pipe = intel_get_pipe_from_connector(connector);
 877         enum transcoder cpu_transcoder =
 878                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 879         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 880
 881         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 882         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 883                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 884                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 885                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 886         }
 887
 888         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 889         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 890                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 891                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 892                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 893         }
 894
 895         if (cpu_transcoder == TRANSCODER_EDP)
 896                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 897         else
 898                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 899         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 900         POSTING_READ(BLC_PWM_CPU_CTL2);
 901         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 902
 903         /* This won't stick until the above enable. */
 904         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 905
 906         pch_ctl2 = panel->backlight.max << 16;
 907         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 908
 909         pch_ctl1 = 0;
 910         if (panel->backlight.active_low_pwm)
 911                 pch_ctl1 |= BLM_PCH_POLARITY;
 912
 913         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 914         POSTING_READ(BLC_PWM_PCH_CTL1);
 915         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 916 }
 917
 918 static void i9xx_enable_backlight(struct intel_connector *connector)
 919 {
 920         struct drm_device *dev = connector->base.dev;
 921         struct drm_i915_private *dev_priv = dev->dev_private;
 922         struct intel_panel *panel = &connector->panel;
 923         u32 ctl, freq;
 924
 925         ctl = I915_READ(BLC_PWM_CTL);
 926         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 927                 DRM_DEBUG_KMS("backlight already enabled\n");
 928                 I915_WRITE(BLC_PWM_CTL, 0);
 929         }
 930
 931         freq = panel->backlight.max;
 932         if (panel->backlight.combination_mode)
 933                 freq /= 0xff;
 934
 935         ctl = freq << 17;
 936         if (panel->backlight.combination_mode)
 937                 ctl |= BLM_LEGACY_MODE;
 938         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 939                 ctl |= BLM_POLARITY_PNV;
 940
 941         I915_WRITE(BLC_PWM_CTL, ctl);
 942         POSTING_READ(BLC_PWM_CTL);
 943
 944         /* XXX: combine this into above write? */
 945         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 946
 947         /*
 948          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 949          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 950          * that has backlight.
 951          */
 952         if (IS_GEN2(dev))
 953                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 954 }
 955
 956 static void i965_enable_backlight(struct intel_connector *connector)
 957 {
 958         struct drm_device *dev = connector->base.dev;
 959         struct drm_i915_private *dev_priv = dev->dev_private;
 960         struct intel_panel *panel = &connector->panel;
 961         enum pipe pipe = intel_get_pipe_from_connector(connector);
 962         u32 ctl, ctl2, freq;
 963
 964         ctl2 = I915_READ(BLC_PWM_CTL2);
 965         if (ctl2 & BLM_PWM_ENABLE) {
 966                 DRM_DEBUG_KMS("backlight already enabled\n");
 967                 ctl2 &= ~BLM_PWM_ENABLE;
 968                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 969         }
 970
 971         freq = panel->backlight.max;
 972         if (panel->backlight.combination_mode)
 973                 freq /= 0xff;
 974
 975         ctl = freq << 16;
 976         I915_WRITE(BLC_PWM_CTL, ctl);
 977
 978         ctl2 = BLM_PIPE(pipe);
 979         if (panel->backlight.combination_mode)
 980                 ctl2 |= BLM_COMBINATION_MODE;
 981         if (panel->backlight.active_low_pwm)
 982                 ctl2 |= BLM_POLARITY_I965;
 983         I915_WRITE(BLC_PWM_CTL2, ctl2);
 984         POSTING_READ(BLC_PWM_CTL2);
 985         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 986
 987         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 988 }
 989
 990 static void vlv_enable_backlight(struct intel_connector *connector)
 991 {
 992         struct drm_device *dev = connector->base.dev;
 993         struct drm_i915_private *dev_priv = dev->dev_private;
 994         struct intel_panel *panel = &connector->panel;
 995         enum pipe pipe = intel_get_pipe_from_connector(connector);
 996         u32 ctl, ctl2;
 997
 998         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 999                 return;
1000
1001         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1002         if (ctl2 & BLM_PWM_ENABLE) {
1003                 DRM_DEBUG_KMS("backlight already enabled\n");
1004                 ctl2 &= ~BLM_PWM_ENABLE;
1005                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1006         }
1007
1008         ctl = panel->backlight.max << 16;
1009         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1010
1011         /* XXX: combine this into above write? */
1012         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1013
1014         ctl2 = 0;
1015         if (panel->backlight.active_low_pwm)
1016                 ctl2 |= BLM_POLARITY_I965;
1017         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1018         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1019         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1020 }
1021
1022 static void bxt_enable_backlight(struct intel_connector *connector)
1023 {
1024         struct drm_device *dev = connector->base.dev;
1025         struct drm_i915_private *dev_priv = dev->dev_private;
1026         struct intel_panel *panel = &connector->panel;
1027         u32 pwm_ctl;
1028
1029         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1030         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1031                 DRM_DEBUG_KMS("backlight already enabled\n");
1032                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1033                 I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1034         }
1035
1036         I915_WRITE(BXT_BLC_PWM_FREQ1, panel->backlight.max);
1037
1038         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1039
1040         pwm_ctl = 0;
1041         if (panel->backlight.active_low_pwm)
1042                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1043
1044         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1045         POSTING_READ(BXT_BLC_PWM_CTL1);
1046         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl | BXT_BLC_PWM_ENABLE);
1047 }
1048
1049 static void pwm_enable_backlight(struct intel_connector *connector)
1050 {
1051         struct intel_panel *panel = &connector->panel;
1052
1053         pwm_enable(panel->backlight.pwm);
1054         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1055 }
1056
1057 void intel_panel_enable_backlight(struct intel_connector *connector)
1058 {
1059         struct drm_device *dev = connector->base.dev;
1060         struct drm_i915_private *dev_priv = dev->dev_private;
1061         struct intel_panel *panel = &connector->panel;
1062         enum pipe pipe = intel_get_pipe_from_connector(connector);
1063
1064         if (!panel->backlight.present)
1065                 return;
1066
1067         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1068
1069         mutex_lock(&dev_priv->backlight_lock);
1070
1071         WARN_ON(panel->backlight.max == 0);
1072
1073         if (panel->backlight.level <= panel->backlight.min) {
1074                 panel->backlight.level = panel->backlight.max;
1075                 if (panel->backlight.device)
1076                         panel->backlight.device->props.brightness =
1077                                 scale_hw_to_user(connector,
1078                                                  panel->backlight.level,
1079                                                  panel->backlight.device->props.max_brightness);
1080         }
1081
1082         dev_priv->display.enable_backlight(connector);
1083         panel->backlight.enabled = true;
1084         if (panel->backlight.device)
1085                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1086
1087         mutex_unlock(&dev_priv->backlight_lock);
1088 }
1089
1090 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1091 static int intel_backlight_device_update_status(struct backlight_device *bd)
1092 {
1093         struct intel_connector *connector = bl_get_data(bd);
1094         struct intel_panel *panel = &connector->panel;
1095         struct drm_device *dev = connector->base.dev;
1096
1097         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1098         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1099                       bd->props.brightness, bd->props.max_brightness);
1100         intel_panel_set_backlight(connector, bd->props.brightness,
1101                                   bd->props.max_brightness);
1102
1103         /*
1104          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1105          * backlight class device does not make it easy to to differentiate
1106          * between callbacks for brightness and bl_power, so our backlight_power
1107          * callback needs to take this into account.
1108          */
1109         if (panel->backlight.enabled) {
1110                 if (panel->backlight_power) {
1111                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1112                                 bd->props.brightness != 0;
1113                         panel->backlight_power(connector, enable);
1114                 }
1115         } else {
1116                 bd->props.power = FB_BLANK_POWERDOWN;
1117         }
1118
1119         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1120         return 0;
1121 }
1122
1123 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1124 {
1125         struct intel_connector *connector = bl_get_data(bd);
1126         struct drm_device *dev = connector->base.dev;
1127         struct drm_i915_private *dev_priv = dev->dev_private;
1128         u32 hw_level;
1129         int ret;
1130
1131         intel_runtime_pm_get(dev_priv);
1132         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1133
1134         hw_level = intel_panel_get_backlight(connector);
1135         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1136
1137         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1138         intel_runtime_pm_put(dev_priv);
1139
1140         return ret;
1141 }
1142
1143 static const struct backlight_ops intel_backlight_device_ops = {
1144         .update_status = intel_backlight_device_update_status,
1145         .get_brightness = intel_backlight_device_get_brightness,
1146 };
1147
1148 static int intel_backlight_device_register(struct intel_connector *connector)
1149 {
1150         struct intel_panel *panel = &connector->panel;
1151         struct backlight_properties props;
1152
1153         if (WARN_ON(panel->backlight.device))
1154                 return -ENODEV;
1155
1156         if (!panel->backlight.present)
1157                 return 0;
1158
1159         WARN_ON(panel->backlight.max == 0);
1160
1161         memset(&props, 0, sizeof(props));
1162         props.type = BACKLIGHT_RAW;
1163
1164         /*
1165          * Note: Everything should work even if the backlight device max
1166          * presented to the userspace is arbitrarily chosen.
1167          */
1168         props.max_brightness = panel->backlight.max;
1169         props.brightness = scale_hw_to_user(connector,
1170                                             panel->backlight.level,
1171                                             props.max_brightness);
1172
1173         if (panel->backlight.enabled)
1174                 props.power = FB_BLANK_UNBLANK;
1175         else
1176                 props.power = FB_BLANK_POWERDOWN;
1177
1178         /*
1179          * Note: using the same name independent of the connector prevents
1180          * registration of multiple backlight devices in the driver.
1181          */
1182         panel->backlight.device =
1183                 backlight_device_register("intel_backlight",
1184                                           connector->base.kdev,
1185                                           connector,
1186                                           &intel_backlight_device_ops, &props);
1187
1188         if (IS_ERR(panel->backlight.device)) {
1189                 DRM_ERROR("Failed to register backlight: %ld\n",
1190                           PTR_ERR(panel->backlight.device));
1191                 panel->backlight.device = NULL;
1192                 return -ENODEV;
1193         }
1194
1195         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1196                       connector->base.name);
1197
1198         return 0;
1199 }
1200
1201 static void intel_backlight_device_unregister(struct intel_connector *connector)
1202 {
1203         struct intel_panel *panel = &connector->panel;
1204
1205         if (panel->backlight.device) {
1206                 backlight_device_unregister(panel->backlight.device);
1207                 panel->backlight.device = NULL;
1208         }
1209 }
1210 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1211 static int intel_backlight_device_register(struct intel_connector *connector)
1212 {
1213         return 0;
1214 }
1215 static void intel_backlight_device_unregister(struct intel_connector *connector)
1216 {
1217 }
1218 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1219
1220 /*
1221  * SPT: This value represents the period of the PWM stream in clock periods
1222  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1223  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1224  */
1225 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1226 {
1227         struct drm_device *dev = connector->base.dev;
1228         struct drm_i915_private *dev_priv = dev->dev_private;
1229         u32 mul, clock;
1230
1231         if (I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY)
1232                 mul = 128;
1233         else
1234                 mul = 16;
1235
1236         clock = MHz(24);
1237
1238         return clock / (pwm_freq_hz * mul);
1239 }
1240
1241 /*
1242  * LPT: This value represents the period of the PWM stream in clock periods
1243  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1244  * LPT SOUTH_CHICKEN2 register bit 5).
1245  */
1246 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1247 {
1248         struct drm_device *dev = connector->base.dev;
1249         struct drm_i915_private *dev_priv = dev->dev_private;
1250         u32 mul, clock;
1251
1252         if (I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY)
1253                 mul = 16;
1254         else
1255                 mul = 128;
1256
1257         if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE)
1258                 clock = MHz(135); /* LPT:H */
1259         else
1260                 clock = MHz(24); /* LPT:LP */
1261
1262         return clock / (pwm_freq_hz * mul);
1263 }
1264
1265 /*
1266  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1267  * display raw clocks multiplied by 128.
1268  */
1269 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1270 {
1271         struct drm_device *dev = connector->base.dev;
1272         int clock = MHz(intel_pch_rawclk(dev));
1273
1274         return clock / (pwm_freq_hz * 128);
1275 }
1276
1277 /*
1278  * Gen2: This field determines the number of time base events (display core
1279  * clock frequency/32) in total for a complete cycle of modulated backlight
1280  * control.
1281  *
1282  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1283  * divided by 32.
1284  */
1285 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1286 {
1287         struct drm_device *dev = connector->base.dev;
1288         struct drm_i915_private *dev_priv = dev->dev_private;
1289         int clock;
1290
1291         if (IS_PINEVIEW(dev))
1292                 clock = intel_hrawclk(dev);
1293         else
1294                 clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
1295
1296         return clock / (pwm_freq_hz * 32);
1297 }
1298
1299 /*
1300  * Gen4: This value represents the period of the PWM stream in display core
1301  * clocks multiplied by 128.
1302  */
1303 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1304 {
1305         struct drm_device *dev = connector->base.dev;
1306         struct drm_i915_private *dev_priv = dev->dev_private;
1307         int clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
1308
1309         return clock / (pwm_freq_hz * 128);
1310 }
1311
1312 /*
1313  * VLV: This value represents the period of the PWM stream in display core
1314  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1315  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1316  */
1317 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1318 {
1319         struct drm_device *dev = connector->base.dev;
1320         struct drm_i915_private *dev_priv = dev->dev_private;
1321         int clock;
1322
1323         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1324                 if (IS_CHERRYVIEW(dev))
1325                         return KHz(19200) / (pwm_freq_hz * 16);
1326                 else
1327                         return MHz(25) / (pwm_freq_hz * 16);
1328         } else {
1329                 clock = intel_hrawclk(dev);
1330                 return MHz(clock) / (pwm_freq_hz * 128);
1331         }
1332 }
1333
1334 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1335 {
1336         struct drm_device *dev = connector->base.dev;
1337         struct drm_i915_private *dev_priv = dev->dev_private;
1338         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1339         u32 pwm;
1340
1341         if (!pwm_freq_hz) {
1342                 DRM_DEBUG_KMS("backlight frequency not specified in VBT\n");
1343                 return 0;
1344         }
1345
1346         if (!dev_priv->display.backlight_hz_to_pwm) {
1347                 DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
1348                 return 0;
1349         }
1350
1351         pwm = dev_priv->display.backlight_hz_to_pwm(connector, pwm_freq_hz);
1352         if (!pwm) {
1353                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1354                 return 0;
1355         }
1356
1357         DRM_DEBUG_KMS("backlight frequency %u Hz from VBT\n", pwm_freq_hz);
1358
1359         return pwm;
1360 }
1361
1362 /*
1363  * Note: The setup hooks can't assume pipe is set!
1364  */
1365 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1366 {
1367         struct drm_device *dev = connector->base.dev;
1368         struct drm_i915_private *dev_priv = dev->dev_private;
1369         struct intel_panel *panel = &connector->panel;
1370         int min;
1371
1372         WARN_ON(panel->backlight.max == 0);
1373
1374         /*
1375          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1376          * to problems. There are such machines out there. Either our
1377          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1378          * against this by letting the minimum be at most (arbitrarily chosen)
1379          * 25% of the max.
1380          */
1381         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1382         if (min != dev_priv->vbt.backlight.min_brightness) {
1383                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1384                               dev_priv->vbt.backlight.min_brightness, min);
1385         }
1386
1387         /* vbt value is a coefficient in range [0..255] */
1388         return scale(min, 0, 255, 0, panel->backlight.max);
1389 }
1390
1391 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1392 {
1393         struct drm_device *dev = connector->base.dev;
1394         struct drm_i915_private *dev_priv = dev->dev_private;
1395         struct intel_panel *panel = &connector->panel;
1396         u32 pch_ctl1, pch_ctl2, val;
1397
1398         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1399         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1400
1401         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1402         panel->backlight.max = pch_ctl2 >> 16;
1403
1404         if (!panel->backlight.max)
1405                 panel->backlight.max = get_backlight_max_vbt(connector);
1406
1407         if (!panel->backlight.max)
1408                 return -ENODEV;
1409
1410         panel->backlight.min = get_backlight_min_vbt(connector);
1411
1412         val = lpt_get_backlight(connector);
1413         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1414
1415         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1416                 panel->backlight.level != 0;
1417
1418         return 0;
1419 }
1420
1421 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1422 {
1423         struct drm_device *dev = connector->base.dev;
1424         struct drm_i915_private *dev_priv = dev->dev_private;
1425         struct intel_panel *panel = &connector->panel;
1426         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1427
1428         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1429         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1430
1431         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1432         panel->backlight.max = pch_ctl2 >> 16;
1433
1434         if (!panel->backlight.max)
1435                 panel->backlight.max = get_backlight_max_vbt(connector);
1436
1437         if (!panel->backlight.max)
1438                 return -ENODEV;
1439
1440         panel->backlight.min = get_backlight_min_vbt(connector);
1441
1442         val = pch_get_backlight(connector);
1443         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1444
1445         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1446         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1447                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1448
1449         return 0;
1450 }
1451
1452 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1453 {
1454         struct drm_device *dev = connector->base.dev;
1455         struct drm_i915_private *dev_priv = dev->dev_private;
1456         struct intel_panel *panel = &connector->panel;
1457         u32 ctl, val;
1458
1459         ctl = I915_READ(BLC_PWM_CTL);
1460
1461         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1462                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1463
1464         if (IS_PINEVIEW(dev))
1465                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1466
1467         panel->backlight.max = ctl >> 17;
1468
1469         if (!panel->backlight.max) {
1470                 panel->backlight.max = get_backlight_max_vbt(connector);
1471                 panel->backlight.max >>= 1;
1472         }
1473
1474         if (!panel->backlight.max)
1475                 return -ENODEV;
1476
1477         if (panel->backlight.combination_mode)
1478                 panel->backlight.max *= 0xff;
1479
1480         panel->backlight.min = get_backlight_min_vbt(connector);
1481
1482         val = i9xx_get_backlight(connector);
1483         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1484
1485         panel->backlight.enabled = panel->backlight.level != 0;
1486
1487         return 0;
1488 }
1489
1490 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1491 {
1492         struct drm_device *dev = connector->base.dev;
1493         struct drm_i915_private *dev_priv = dev->dev_private;
1494         struct intel_panel *panel = &connector->panel;
1495         u32 ctl, ctl2, val;
1496
1497         ctl2 = I915_READ(BLC_PWM_CTL2);
1498         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1499         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1500
1501         ctl = I915_READ(BLC_PWM_CTL);
1502         panel->backlight.max = ctl >> 16;
1503
1504         if (!panel->backlight.max)
1505                 panel->backlight.max = get_backlight_max_vbt(connector);
1506
1507         if (!panel->backlight.max)
1508                 return -ENODEV;
1509
1510         if (panel->backlight.combination_mode)
1511                 panel->backlight.max *= 0xff;
1512
1513         panel->backlight.min = get_backlight_min_vbt(connector);
1514
1515         val = i9xx_get_backlight(connector);
1516         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1517
1518         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1519                 panel->backlight.level != 0;
1520
1521         return 0;
1522 }
1523
1524 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1525 {
1526         struct drm_device *dev = connector->base.dev;
1527         struct drm_i915_private *dev_priv = dev->dev_private;
1528         struct intel_panel *panel = &connector->panel;
1529         u32 ctl, ctl2, val;
1530
1531         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1532                 return -ENODEV;
1533
1534         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1535         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1536
1537         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1538         panel->backlight.max = ctl >> 16;
1539
1540         if (!panel->backlight.max)
1541                 panel->backlight.max = get_backlight_max_vbt(connector);
1542
1543         if (!panel->backlight.max)
1544                 return -ENODEV;
1545
1546         panel->backlight.min = get_backlight_min_vbt(connector);
1547
1548         val = _vlv_get_backlight(dev, pipe);
1549         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1550
1551         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1552                 panel->backlight.level != 0;
1553
1554         return 0;
1555 }
1556
1557 static int
1558 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1559 {
1560         struct drm_device *dev = connector->base.dev;
1561         struct drm_i915_private *dev_priv = dev->dev_private;
1562         struct intel_panel *panel = &connector->panel;
1563         u32 pwm_ctl, val;
1564
1565         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1566         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1567
1568         panel->backlight.max = I915_READ(BXT_BLC_PWM_FREQ1);
1569
1570         if (!panel->backlight.max)
1571                 panel->backlight.max = get_backlight_max_vbt(connector);
1572
1573         if (!panel->backlight.max)
1574                 return -ENODEV;
1575
1576         val = bxt_get_backlight(connector);
1577         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1578
1579         panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1580                 panel->backlight.level != 0;
1581
1582         return 0;
1583 }
1584
1585 static int pwm_setup_backlight(struct intel_connector *connector,
1586                                enum pipe pipe)
1587 {
1588         struct drm_device *dev = connector->base.dev;
1589         struct intel_panel *panel = &connector->panel;
1590         int retval;
1591
1592         /* Get the PWM chip for backlight control */
1593         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1594         if (IS_ERR(panel->backlight.pwm)) {
1595                 DRM_ERROR("Failed to own the pwm chip\n");
1596                 panel->backlight.pwm = NULL;
1597                 return -ENODEV;
1598         }
1599
1600         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1601                             CRC_PMIC_PWM_PERIOD_NS);
1602         if (retval < 0) {
1603                 DRM_ERROR("Failed to configure the pwm chip\n");
1604                 pwm_put(panel->backlight.pwm);
1605                 panel->backlight.pwm = NULL;
1606                 return retval;
1607         }
1608
1609         panel->backlight.min = 0; /* 0% */
1610         panel->backlight.max = 100; /* 100% */
1611         panel->backlight.level = DIV_ROUND_UP(
1612                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1613                                  CRC_PMIC_PWM_PERIOD_NS);
1614         panel->backlight.enabled = panel->backlight.level != 0;
1615
1616         return 0;
1617 }
1618
1619 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1620 {
1621         struct drm_device *dev = connector->dev;
1622         struct drm_i915_private *dev_priv = dev->dev_private;
1623         struct intel_connector *intel_connector = to_intel_connector(connector);
1624         struct intel_panel *panel = &intel_connector->panel;
1625         int ret;
1626
1627         if (!dev_priv->vbt.backlight.present) {
1628                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1629                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1630                 } else {
1631                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1632                         return 0;
1633                 }
1634         }
1635
1636         /* set level and max in panel struct */
1637         mutex_lock(&dev_priv->backlight_lock);
1638         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1639         mutex_unlock(&dev_priv->backlight_lock);
1640
1641         if (ret) {
1642                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1643                               connector->name);
1644                 return ret;
1645         }
1646
1647         panel->backlight.present = true;
1648
1649         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1650                       connector->name,
1651                       panel->backlight.enabled ? "enabled" : "disabled",
1652                       panel->backlight.level, panel->backlight.max);
1653
1654         return 0;
1655 }
1656
1657 void intel_panel_destroy_backlight(struct drm_connector *connector)
1658 {
1659         struct intel_connector *intel_connector = to_intel_connector(connector);
1660         struct intel_panel *panel = &intel_connector->panel;
1661
1662         /* dispose of the pwm */
1663         if (panel->backlight.pwm)
1664                 pwm_put(panel->backlight.pwm);
1665
1666         panel->backlight.present = false;
1667 }
1668
1669 /* Set up chip specific backlight functions */
1670 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1671 {
1672         struct drm_i915_private *dev_priv = dev->dev_private;
1673
1674         if (IS_BROXTON(dev)) {
1675                 dev_priv->display.setup_backlight = bxt_setup_backlight;
1676                 dev_priv->display.enable_backlight = bxt_enable_backlight;
1677                 dev_priv->display.disable_backlight = bxt_disable_backlight;
1678                 dev_priv->display.set_backlight = bxt_set_backlight;
1679                 dev_priv->display.get_backlight = bxt_get_backlight;
1680         } else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
1681                 dev_priv->display.setup_backlight = lpt_setup_backlight;
1682                 dev_priv->display.enable_backlight = lpt_enable_backlight;
1683                 dev_priv->display.disable_backlight = lpt_disable_backlight;
1684                 dev_priv->display.set_backlight = lpt_set_backlight;
1685                 dev_priv->display.get_backlight = lpt_get_backlight;
1686                 if (HAS_PCH_LPT(dev))
1687                         dev_priv->display.backlight_hz_to_pwm = lpt_hz_to_pwm;
1688                 else
1689                         dev_priv->display.backlight_hz_to_pwm = spt_hz_to_pwm;
1690         } else if (HAS_PCH_SPLIT(dev)) {
1691                 dev_priv->display.setup_backlight = pch_setup_backlight;
1692                 dev_priv->display.enable_backlight = pch_enable_backlight;
1693                 dev_priv->display.disable_backlight = pch_disable_backlight;
1694                 dev_priv->display.set_backlight = pch_set_backlight;
1695                 dev_priv->display.get_backlight = pch_get_backlight;
1696                 dev_priv->display.backlight_hz_to_pwm = pch_hz_to_pwm;
1697         } else if (IS_VALLEYVIEW(dev)) {
1698                 if (dev_priv->vbt.has_mipi) {
1699                         dev_priv->display.setup_backlight = pwm_setup_backlight;
1700                         dev_priv->display.enable_backlight = pwm_enable_backlight;
1701                         dev_priv->display.disable_backlight = pwm_disable_backlight;
1702                         dev_priv->display.set_backlight = pwm_set_backlight;
1703                         dev_priv->display.get_backlight = pwm_get_backlight;
1704                 } else {
1705                         dev_priv->display.setup_backlight = vlv_setup_backlight;
1706                         dev_priv->display.enable_backlight = vlv_enable_backlight;
1707                         dev_priv->display.disable_backlight = vlv_disable_backlight;
1708                         dev_priv->display.set_backlight = vlv_set_backlight;
1709                         dev_priv->display.get_backlight = vlv_get_backlight;
1710                         dev_priv->display.backlight_hz_to_pwm = vlv_hz_to_pwm;
1711                 }
1712         } else if (IS_GEN4(dev)) {
1713                 dev_priv->display.setup_backlight = i965_setup_backlight;
1714                 dev_priv->display.enable_backlight = i965_enable_backlight;
1715                 dev_priv->display.disable_backlight = i965_disable_backlight;
1716                 dev_priv->display.set_backlight = i9xx_set_backlight;
1717                 dev_priv->display.get_backlight = i9xx_get_backlight;
1718                 dev_priv->display.backlight_hz_to_pwm = i965_hz_to_pwm;
1719         } else {
1720                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1721                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1722                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1723                 dev_priv->display.set_backlight = i9xx_set_backlight;
1724                 dev_priv->display.get_backlight = i9xx_get_backlight;
1725                 dev_priv->display.backlight_hz_to_pwm = i9xx_hz_to_pwm;
1726         }
1727 }
1728
1729 int intel_panel_init(struct intel_panel *panel,
1730                      struct drm_display_mode *fixed_mode,
1731                      struct drm_display_mode *downclock_mode)
1732 {
1733         panel->fixed_mode = fixed_mode;
1734         panel->downclock_mode = downclock_mode;
1735
1736         return 0;
1737 }
1738
1739 void intel_panel_fini(struct intel_panel *panel)
1740 {
1741         struct intel_connector *intel_connector =
1742                 container_of(panel, struct intel_connector, panel);
1743
1744         if (panel->fixed_mode)
1745                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1746
1747         if (panel->downclock_mode)
1748                 drm_mode_destroy(intel_connector->base.dev,
1749                                 panel->downclock_mode);
1750 }
1751
1752 void intel_backlight_register(struct drm_device *dev)
1753 {
1754         struct intel_connector *connector;
1755
1756         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1757                 intel_backlight_device_register(connector);
1758 }
1759
1760 void intel_backlight_unregister(struct drm_device *dev)
1761 {
1762         struct intel_connector *connector;
1763
1764         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1765                 intel_backlight_device_unregister(connector);
1766 }