drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <[email protected]>
   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 <[email protected]>
  26  *      Dave Airlie <[email protected]>
  27  *      Jesse Barnes <[email protected]>
  28  *      Chris Wilson <[email protected]>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/moduleparam.h>
  34 #include "intel_drv.h"
  35
  36 void
  37 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  38                        struct drm_display_mode *adjusted_mode)
  39 {
  40         drm_mode_copy(adjusted_mode, fixed_mode);
  41
  42         drm_mode_set_crtcinfo(adjusted_mode, 0);
  43 }
  44
  45 /**
  46  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  47  * @dev: drm device
  48  * @fixed_mode : panel native mode
  49  * @connector: LVDS/eDP connector
  50  *
  51  * Return downclock_avail
  52  * Find the reduced downclock for LVDS/eDP in EDID.
  53  */
  54 struct drm_display_mode *
  55 intel_find_panel_downclock(struct drm_device *dev,
  56                         struct drm_display_mode *fixed_mode,
  57                         struct drm_connector *connector)
  58 {
  59         struct drm_display_mode *scan, *tmp_mode;
  60         int temp_downclock;
  61
  62         temp_downclock = fixed_mode->clock;
  63         tmp_mode = NULL;
  64
  65         list_for_each_entry(scan, &connector->probed_modes, head) {
  66                 /*
  67                  * If one mode has the same resolution with the fixed_panel
  68                  * mode while they have the different refresh rate, it means
  69                  * that the reduced downclock is found. In such
  70                  * case we can set the different FPx0/1 to dynamically select
  71                  * between low and high frequency.
  72                  */
  73                 if (scan->hdisplay == fixed_mode->hdisplay &&
  74                     scan->hsync_start == fixed_mode->hsync_start &&
  75                     scan->hsync_end == fixed_mode->hsync_end &&
  76                     scan->htotal == fixed_mode->htotal &&
  77                     scan->vdisplay == fixed_mode->vdisplay &&
  78                     scan->vsync_start == fixed_mode->vsync_start &&
  79                     scan->vsync_end == fixed_mode->vsync_end &&
  80                     scan->vtotal == fixed_mode->vtotal) {
  81                         if (scan->clock < temp_downclock) {
  82                                 /*
  83                                  * The downclock is already found. But we
  84                                  * expect to find the lower downclock.
  85                                  */
  86                                 temp_downclock = scan->clock;
  87                                 tmp_mode = scan;
  88                         }
  89                 }
  90         }
  91
  92         if (temp_downclock < fixed_mode->clock)
  93                 return drm_mode_duplicate(dev, tmp_mode);
  94         else
  95                 return NULL;
  96 }
  97
  98 /* adjusted_mode has been preset to be the panel's fixed mode */
  99 void
 100 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 101                         struct intel_crtc_config *pipe_config,
 102                         int fitting_mode)
 103 {
 104         struct drm_display_mode *adjusted_mode;
 105         int x, y, width, height;
 106
 107         adjusted_mode = &pipe_config->adjusted_mode;
 108
 109         x = y = width = height = 0;
 110
 111         /* Native modes don't need fitting */
 112         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 113             adjusted_mode->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->hdisplay - width + 1)/2;
 121                 y = (adjusted_mode->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->hdisplay
 128                                 * pipe_config->pipe_src_h;
 129                         u32 scaled_height = pipe_config->pipe_src_w
 130                                 * adjusted_mode->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->hdisplay - width + 1) / 2;
 136                                 y = 0;
 137                                 height = adjusted_mode->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->vdisplay - height + 1) / 2;
 143                                 x = 0;
 144                                 width = adjusted_mode->hdisplay;
 145                         } else {
 146                                 x = y = 0;
 147                                 width = adjusted_mode->hdisplay;
 148                                 height = adjusted_mode->vdisplay;
 149                         }
 150                 }
 151                 break;
 152
 153         case DRM_MODE_SCALE_FULLSCREEN:
 154                 x = y = 0;
 155                 width = adjusted_mode->hdisplay;
 156                 height = adjusted_mode->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 *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 = mode->crtc_hsync_end - mode->crtc_hsync_start;
 178         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 179         sync_pos = (blank_width - sync_width + 1) / 2;
 180
 181         border = (mode->hdisplay - width + 1) / 2;
 182         border += border & 1; /* make the border even */
 183
 184         mode->crtc_hdisplay = width;
 185         mode->crtc_hblank_start = width + border;
 186         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 187
 188         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 189         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 190 }
 191
 192 static void
 193 centre_vertically(struct drm_display_mode *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 = mode->crtc_vsync_end - mode->crtc_vsync_start;
 200         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 201         sync_pos = (blank_width - sync_width + 1) / 2;
 202
 203         border = (mode->vdisplay - height + 1) / 2;
 204
 205         mode->crtc_vdisplay = height;
 206         mode->crtc_vblank_start = height + border;
 207         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 208
 209         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 210         mode->crtc_vsync_end = 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_config *pipe_config,
 227                               u32 *pfit_control)
 228 {
 229         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 230         u32 scaled_width = adjusted_mode->hdisplay *
 231                 pipe_config->pipe_src_h;
 232         u32 scaled_height = pipe_config->pipe_src_w *
 233                 adjusted_mode->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->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_config *pipe_config,
 247                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 248                               u32 *border)
 249 {
 250         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 251         u32 scaled_width = adjusted_mode->hdisplay *
 252                 pipe_config->pipe_src_h;
 253         u32 scaled_height = pipe_config->pipe_src_w *
 254                 adjusted_mode->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->vdisplay) {
 269                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 270                                                     adjusted_mode->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->hdisplay) {
 285                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 286                                                     adjusted_mode->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_config *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;
 310
 311         adjusted_mode = &pipe_config->adjusted_mode;
 312
 313         /* Native modes don't need fitting */
 314         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 315             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 316                 goto out;
 317
 318         switch (fitting_mode) {
 319         case DRM_MODE_SCALE_CENTER:
 320                 /*
 321                  * For centered modes, we have to calculate border widths &
 322                  * heights and modify the values programmed into the CRTC.
 323                  */
 324                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 325                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 326                 border = LVDS_BORDER_ENABLE;
 327                 break;
 328         case DRM_MODE_SCALE_ASPECT:
 329                 /* Scale but preserve the aspect ratio */
 330                 if (INTEL_INFO(dev)->gen >= 4)
 331                         i965_scale_aspect(pipe_config, &pfit_control);
 332                 else
 333                         i9xx_scale_aspect(pipe_config, &pfit_control,
 334                                           &pfit_pgm_ratios, &border);
 335                 break;
 336         case DRM_MODE_SCALE_FULLSCREEN:
 337                 /*
 338                  * Full scaling, even if it changes the aspect ratio.
 339                  * Fortunately this is all done for us in hw.
 340                  */
 341                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 342                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 343                         pfit_control |= PFIT_ENABLE;
 344                         if (INTEL_INFO(dev)->gen >= 4)
 345                                 pfit_control |= PFIT_SCALING_AUTO;
 346                         else
 347                                 pfit_control |= (VERT_AUTO_SCALE |
 348                                                  VERT_INTERP_BILINEAR |
 349                                                  HORIZ_AUTO_SCALE |
 350                                                  HORIZ_INTERP_BILINEAR);
 351                 }
 352                 break;
 353         default:
 354                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 355                 return;
 356         }
 357
 358         /* 965+ wants fuzzy fitting */
 359         /* FIXME: handle multiple panels by failing gracefully */
 360         if (INTEL_INFO(dev)->gen >= 4)
 361                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 362                                  PFIT_FILTER_FUZZY);
 363
 364 out:
 365         if ((pfit_control & PFIT_ENABLE) == 0) {
 366                 pfit_control = 0;
 367                 pfit_pgm_ratios = 0;
 368         }
 369
 370         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 371         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 372                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 373
 374         pipe_config->gmch_pfit.control = pfit_control;
 375         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 376         pipe_config->gmch_pfit.lvds_border_bits = border;
 377 }
 378
 379 enum drm_connector_status
 380 intel_panel_detect(struct drm_device *dev)
 381 {
 382         struct drm_i915_private *dev_priv = dev->dev_private;
 383
 384         /* Assume that the BIOS does not lie through the OpRegion... */
 385         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 386                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 387                         connector_status_connected :
 388                         connector_status_disconnected;
 389         }
 390
 391         switch (i915.panel_ignore_lid) {
 392         case -2:
 393                 return connector_status_connected;
 394         case -1:
 395                 return connector_status_disconnected;
 396         default:
 397                 return connector_status_unknown;
 398         }
 399 }
 400
 401 /**
 402  * scale - scale values from one range to another
 403  *
 404  * @source_val: value in range [@source_min..@source_max]
 405  *
 406  * Return @source_val in range [@source_min..@source_max] scaled to range
 407  * [@target_min..@target_max].
 408  */
 409 static uint32_t scale(uint32_t source_val,
 410                       uint32_t source_min, uint32_t source_max,
 411                       uint32_t target_min, uint32_t target_max)
 412 {
 413         uint64_t target_val;
 414
 415         WARN_ON(source_min > source_max);
 416         WARN_ON(target_min > target_max);
 417
 418         /* defensive */
 419         source_val = clamp(source_val, source_min, source_max);
 420
 421         /* avoid overflows */
 422         target_val = (uint64_t)(source_val - source_min) *
 423                 (target_max - target_min);
 424         do_div(target_val, source_max - source_min);
 425         target_val += target_min;
 426
 427         return target_val;
 428 }
 429
 430 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 431 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 432                                    u32 user_level, u32 user_max)
 433 {
 434         struct intel_panel *panel = &connector->panel;
 435
 436         return scale(user_level, 0, user_max,
 437                      panel->backlight.min, panel->backlight.max);
 438 }
 439
 440 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 441  * to [hw_min..hw_max]. */
 442 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 443                                    u32 user_level, u32 user_max)
 444 {
 445         struct intel_panel *panel = &connector->panel;
 446         u32 hw_level;
 447
 448         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 449         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 450
 451         return hw_level;
 452 }
 453
 454 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 455 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 456                                    u32 hw_level, u32 user_max)
 457 {
 458         struct intel_panel *panel = &connector->panel;
 459
 460         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 461                      0, user_max);
 462 }
 463
 464 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 465                                           u32 val)
 466 {
 467         struct drm_device *dev = connector->base.dev;
 468         struct drm_i915_private *dev_priv = dev->dev_private;
 469         struct intel_panel *panel = &connector->panel;
 470
 471         WARN_ON(panel->backlight.max == 0);
 472
 473         if (i915.invert_brightness < 0)
 474                 return val;
 475
 476         if (i915.invert_brightness > 0 ||
 477             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 478                 return panel->backlight.max - val;
 479         }
 480
 481         return val;
 482 }
 483
 484 static u32 bdw_get_backlight(struct intel_connector *connector)
 485 {
 486         struct drm_device *dev = connector->base.dev;
 487         struct drm_i915_private *dev_priv = dev->dev_private;
 488
 489         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 490 }
 491
 492 static u32 pch_get_backlight(struct intel_connector *connector)
 493 {
 494         struct drm_device *dev = connector->base.dev;
 495         struct drm_i915_private *dev_priv = dev->dev_private;
 496
 497         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 498 }
 499
 500 static u32 i9xx_get_backlight(struct intel_connector *connector)
 501 {
 502         struct drm_device *dev = connector->base.dev;
 503         struct drm_i915_private *dev_priv = dev->dev_private;
 504         struct intel_panel *panel = &connector->panel;
 505         u32 val;
 506
 507         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 508         if (INTEL_INFO(dev)->gen < 4)
 509                 val >>= 1;
 510
 511         if (panel->backlight.combination_mode) {
 512                 u8 lbpc;
 513
 514                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 515                 val *= lbpc;
 516         }
 517
 518         return val;
 519 }
 520
 521 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 522 {
 523         struct drm_i915_private *dev_priv = dev->dev_private;
 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 intel_panel_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         u32 val;
 541         unsigned long flags;
 542
 543         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 544
 545         val = dev_priv->display.get_backlight(connector);
 546         val = intel_panel_compute_brightness(connector, val);
 547
 548         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 549
 550         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 551         return val;
 552 }
 553
 554 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 555 {
 556         struct drm_device *dev = connector->base.dev;
 557         struct drm_i915_private *dev_priv = dev->dev_private;
 558         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 559         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 560 }
 561
 562 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 563 {
 564         struct drm_device *dev = connector->base.dev;
 565         struct drm_i915_private *dev_priv = dev->dev_private;
 566         u32 tmp;
 567
 568         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 569         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 570 }
 571
 572 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 573 {
 574         struct drm_device *dev = connector->base.dev;
 575         struct drm_i915_private *dev_priv = dev->dev_private;
 576         struct intel_panel *panel = &connector->panel;
 577         u32 tmp, mask;
 578
 579         WARN_ON(panel->backlight.max == 0);
 580
 581         if (panel->backlight.combination_mode) {
 582                 u8 lbpc;
 583
 584                 lbpc = level * 0xfe / panel->backlight.max + 1;
 585                 level /= lbpc;
 586                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 587         }
 588
 589         if (IS_GEN4(dev)) {
 590                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 591         } else {
 592                 level <<= 1;
 593                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 594         }
 595
 596         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 597         I915_WRITE(BLC_PWM_CTL, tmp | level);
 598 }
 599
 600 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 601 {
 602         struct drm_device *dev = connector->base.dev;
 603         struct drm_i915_private *dev_priv = dev->dev_private;
 604         enum pipe pipe = intel_get_pipe_from_connector(connector);
 605         u32 tmp;
 606
 607         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 608         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 609 }
 610
 611 static void
 612 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 613 {
 614         struct drm_device *dev = connector->base.dev;
 615         struct drm_i915_private *dev_priv = dev->dev_private;
 616
 617         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 618
 619         level = intel_panel_compute_brightness(connector, level);
 620         dev_priv->display.set_backlight(connector, level);
 621 }
 622
 623 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 624 static void intel_panel_set_backlight(struct intel_connector *connector,
 625                                       u32 user_level, u32 user_max)
 626 {
 627         struct drm_device *dev = connector->base.dev;
 628         struct drm_i915_private *dev_priv = dev->dev_private;
 629         struct intel_panel *panel = &connector->panel;
 630         enum pipe pipe = intel_get_pipe_from_connector(connector);
 631         u32 hw_level;
 632         unsigned long flags;
 633
 634         if (!panel->backlight.present || pipe == INVALID_PIPE)
 635                 return;
 636
 637         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 638
 639         WARN_ON(panel->backlight.max == 0);
 640
 641         hw_level = scale_user_to_hw(connector, user_level, user_max);
 642         panel->backlight.level = hw_level;
 643
 644         if (panel->backlight.enabled)
 645                 intel_panel_actually_set_backlight(connector, hw_level);
 646
 647         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 648 }
 649
 650 /* set backlight brightness to level in range [0..max], assuming hw min is
 651  * respected.
 652  */
 653 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 654                                     u32 user_level, u32 user_max)
 655 {
 656         struct drm_device *dev = connector->base.dev;
 657         struct drm_i915_private *dev_priv = dev->dev_private;
 658         struct intel_panel *panel = &connector->panel;
 659         enum pipe pipe = intel_get_pipe_from_connector(connector);
 660         u32 hw_level;
 661         unsigned long flags;
 662
 663         if (!panel->backlight.present || pipe == INVALID_PIPE)
 664                 return;
 665
 666         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 667
 668         WARN_ON(panel->backlight.max == 0);
 669
 670         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 671         panel->backlight.level = hw_level;
 672
 673         if (panel->backlight.device)
 674                 panel->backlight.device->props.brightness =
 675                         scale_hw_to_user(connector,
 676                                          panel->backlight.level,
 677                                          panel->backlight.device->props.max_brightness);
 678
 679         if (panel->backlight.enabled)
 680                 intel_panel_actually_set_backlight(connector, hw_level);
 681
 682         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 683 }
 684
 685 static void pch_disable_backlight(struct intel_connector *connector)
 686 {
 687         struct drm_device *dev = connector->base.dev;
 688         struct drm_i915_private *dev_priv = dev->dev_private;
 689         u32 tmp;
 690
 691         intel_panel_actually_set_backlight(connector, 0);
 692
 693         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 694         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 695
 696         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 697         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 698 }
 699
 700 static void i9xx_disable_backlight(struct intel_connector *connector)
 701 {
 702         intel_panel_actually_set_backlight(connector, 0);
 703 }
 704
 705 static void i965_disable_backlight(struct intel_connector *connector)
 706 {
 707         struct drm_device *dev = connector->base.dev;
 708         struct drm_i915_private *dev_priv = dev->dev_private;
 709         u32 tmp;
 710
 711         intel_panel_actually_set_backlight(connector, 0);
 712
 713         tmp = I915_READ(BLC_PWM_CTL2);
 714         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 715 }
 716
 717 static void vlv_disable_backlight(struct intel_connector *connector)
 718 {
 719         struct drm_device *dev = connector->base.dev;
 720         struct drm_i915_private *dev_priv = dev->dev_private;
 721         enum pipe pipe = intel_get_pipe_from_connector(connector);
 722         u32 tmp;
 723
 724         intel_panel_actually_set_backlight(connector, 0);
 725
 726         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 727         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 728 }
 729
 730 void intel_panel_disable_backlight(struct intel_connector *connector)
 731 {
 732         struct drm_device *dev = connector->base.dev;
 733         struct drm_i915_private *dev_priv = dev->dev_private;
 734         struct intel_panel *panel = &connector->panel;
 735         enum pipe pipe = intel_get_pipe_from_connector(connector);
 736         unsigned long flags;
 737
 738         if (!panel->backlight.present || pipe == INVALID_PIPE)
 739                 return;
 740
 741         /*
 742          * Do not disable backlight on the vgaswitcheroo path. When switching
 743          * away from i915, the other client may depend on i915 to handle the
 744          * backlight. This will leave the backlight on unnecessarily when
 745          * another client is not activated.
 746          */
 747         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 748                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 749                 return;
 750         }
 751
 752         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 753
 754         panel->backlight.enabled = false;
 755         dev_priv->display.disable_backlight(connector);
 756
 757         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 758 }
 759
 760 static void bdw_enable_backlight(struct intel_connector *connector)
 761 {
 762         struct drm_device *dev = connector->base.dev;
 763         struct drm_i915_private *dev_priv = dev->dev_private;
 764         struct intel_panel *panel = &connector->panel;
 765         u32 pch_ctl1, pch_ctl2;
 766
 767         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 768         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 769                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 770                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 771                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 772         }
 773
 774         pch_ctl2 = panel->backlight.max << 16;
 775         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 776
 777         pch_ctl1 = 0;
 778         if (panel->backlight.active_low_pwm)
 779                 pch_ctl1 |= BLM_PCH_POLARITY;
 780
 781         /* BDW always uses the pch pwm controls. */
 782         pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 783
 784         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 785         POSTING_READ(BLC_PWM_PCH_CTL1);
 786         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 787
 788         /* This won't stick until the above enable. */
 789         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 790 }
 791
 792 static void pch_enable_backlight(struct intel_connector *connector)
 793 {
 794         struct drm_device *dev = connector->base.dev;
 795         struct drm_i915_private *dev_priv = dev->dev_private;
 796         struct intel_panel *panel = &connector->panel;
 797         enum pipe pipe = intel_get_pipe_from_connector(connector);
 798         enum transcoder cpu_transcoder =
 799                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 800         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 801
 802         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 803         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 804                 WARN(1, "cpu backlight already enabled\n");
 805                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 806                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 807         }
 808
 809         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 810         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 811                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 812                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 813                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 814         }
 815
 816         if (cpu_transcoder == TRANSCODER_EDP)
 817                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 818         else
 819                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 820         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 821         POSTING_READ(BLC_PWM_CPU_CTL2);
 822         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 823
 824         /* This won't stick until the above enable. */
 825         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 826
 827         pch_ctl2 = panel->backlight.max << 16;
 828         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 829
 830         pch_ctl1 = 0;
 831         if (panel->backlight.active_low_pwm)
 832                 pch_ctl1 |= BLM_PCH_POLARITY;
 833
 834         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 835         POSTING_READ(BLC_PWM_PCH_CTL1);
 836         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 837 }
 838
 839 static void i9xx_enable_backlight(struct intel_connector *connector)
 840 {
 841         struct drm_device *dev = connector->base.dev;
 842         struct drm_i915_private *dev_priv = dev->dev_private;
 843         struct intel_panel *panel = &connector->panel;
 844         u32 ctl, freq;
 845
 846         ctl = I915_READ(BLC_PWM_CTL);
 847         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 848                 WARN(1, "backlight already enabled\n");
 849                 I915_WRITE(BLC_PWM_CTL, 0);
 850         }
 851
 852         freq = panel->backlight.max;
 853         if (panel->backlight.combination_mode)
 854                 freq /= 0xff;
 855
 856         ctl = freq << 17;
 857         if (panel->backlight.combination_mode)
 858                 ctl |= BLM_LEGACY_MODE;
 859         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 860                 ctl |= BLM_POLARITY_PNV;
 861
 862         I915_WRITE(BLC_PWM_CTL, ctl);
 863         POSTING_READ(BLC_PWM_CTL);
 864
 865         /* XXX: combine this into above write? */
 866         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 867 }
 868
 869 static void i965_enable_backlight(struct intel_connector *connector)
 870 {
 871         struct drm_device *dev = connector->base.dev;
 872         struct drm_i915_private *dev_priv = dev->dev_private;
 873         struct intel_panel *panel = &connector->panel;
 874         enum pipe pipe = intel_get_pipe_from_connector(connector);
 875         u32 ctl, ctl2, freq;
 876
 877         ctl2 = I915_READ(BLC_PWM_CTL2);
 878         if (ctl2 & BLM_PWM_ENABLE) {
 879                 WARN(1, "backlight already enabled\n");
 880                 ctl2 &= ~BLM_PWM_ENABLE;
 881                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 882         }
 883
 884         freq = panel->backlight.max;
 885         if (panel->backlight.combination_mode)
 886                 freq /= 0xff;
 887
 888         ctl = freq << 16;
 889         I915_WRITE(BLC_PWM_CTL, ctl);
 890
 891         ctl2 = BLM_PIPE(pipe);
 892         if (panel->backlight.combination_mode)
 893                 ctl2 |= BLM_COMBINATION_MODE;
 894         if (panel->backlight.active_low_pwm)
 895                 ctl2 |= BLM_POLARITY_I965;
 896         I915_WRITE(BLC_PWM_CTL2, ctl2);
 897         POSTING_READ(BLC_PWM_CTL2);
 898         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 899
 900         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 901 }
 902
 903 static void vlv_enable_backlight(struct intel_connector *connector)
 904 {
 905         struct drm_device *dev = connector->base.dev;
 906         struct drm_i915_private *dev_priv = dev->dev_private;
 907         struct intel_panel *panel = &connector->panel;
 908         enum pipe pipe = intel_get_pipe_from_connector(connector);
 909         u32 ctl, ctl2;
 910
 911         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 912         if (ctl2 & BLM_PWM_ENABLE) {
 913                 WARN(1, "backlight already enabled\n");
 914                 ctl2 &= ~BLM_PWM_ENABLE;
 915                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 916         }
 917
 918         ctl = panel->backlight.max << 16;
 919         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 920
 921         /* XXX: combine this into above write? */
 922         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 923
 924         ctl2 = 0;
 925         if (panel->backlight.active_low_pwm)
 926                 ctl2 |= BLM_POLARITY_I965;
 927         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 928         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 929         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 930 }
 931
 932 void intel_panel_enable_backlight(struct intel_connector *connector)
 933 {
 934         struct drm_device *dev = connector->base.dev;
 935         struct drm_i915_private *dev_priv = dev->dev_private;
 936         struct intel_panel *panel = &connector->panel;
 937         enum pipe pipe = intel_get_pipe_from_connector(connector);
 938         unsigned long flags;
 939
 940         if (!panel->backlight.present || pipe == INVALID_PIPE)
 941                 return;
 942
 943         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 944
 945         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 946
 947         WARN_ON(panel->backlight.max == 0);
 948
 949         if (panel->backlight.level == 0) {
 950                 panel->backlight.level = panel->backlight.max;
 951                 if (panel->backlight.device)
 952                         panel->backlight.device->props.brightness =
 953                                 scale_hw_to_user(connector,
 954                                                  panel->backlight.level,
 955                                                  panel->backlight.device->props.max_brightness);
 956         }
 957
 958         dev_priv->display.enable_backlight(connector);
 959         panel->backlight.enabled = true;
 960
 961         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 962 }
 963
 964 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 965 static int intel_backlight_device_update_status(struct backlight_device *bd)
 966 {
 967         struct intel_connector *connector = bl_get_data(bd);
 968         struct drm_device *dev = connector->base.dev;
 969
 970         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 971         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 972                       bd->props.brightness, bd->props.max_brightness);
 973         intel_panel_set_backlight(connector, bd->props.brightness,
 974                                   bd->props.max_brightness);
 975         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 976         return 0;
 977 }
 978
 979 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 980 {
 981         struct intel_connector *connector = bl_get_data(bd);
 982         struct drm_device *dev = connector->base.dev;
 983         struct drm_i915_private *dev_priv = dev->dev_private;
 984         u32 hw_level;
 985         int ret;
 986
 987         intel_runtime_pm_get(dev_priv);
 988         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 989
 990         hw_level = intel_panel_get_backlight(connector);
 991         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
 992
 993         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 994         intel_runtime_pm_put(dev_priv);
 995
 996         return ret;
 997 }
 998
 999 static const struct backlight_ops intel_backlight_device_ops = {
1000         .update_status = intel_backlight_device_update_status,
1001         .get_brightness = intel_backlight_device_get_brightness,
1002 };
1003
1004 static int intel_backlight_device_register(struct intel_connector *connector)
1005 {
1006         struct intel_panel *panel = &connector->panel;
1007         struct backlight_properties props;
1008
1009         if (WARN_ON(panel->backlight.device))
1010                 return -ENODEV;
1011
1012         WARN_ON(panel->backlight.max == 0);
1013
1014         memset(&props, 0, sizeof(props));
1015         props.type = BACKLIGHT_RAW;
1016
1017         /*
1018          * Note: Everything should work even if the backlight device max
1019          * presented to the userspace is arbitrarily chosen.
1020          */
1021         props.max_brightness = panel->backlight.max;
1022         props.brightness = scale_hw_to_user(connector,
1023                                             panel->backlight.level,
1024                                             props.max_brightness);
1025
1026         /*
1027          * Note: using the same name independent of the connector prevents
1028          * registration of multiple backlight devices in the driver.
1029          */
1030         panel->backlight.device =
1031                 backlight_device_register("intel_backlight",
1032                                           connector->base.kdev,
1033                                           connector,
1034                                           &intel_backlight_device_ops, &props);
1035
1036         if (IS_ERR(panel->backlight.device)) {
1037                 DRM_ERROR("Failed to register backlight: %ld\n",
1038                           PTR_ERR(panel->backlight.device));
1039                 panel->backlight.device = NULL;
1040                 return -ENODEV;
1041         }
1042         return 0;
1043 }
1044
1045 static void intel_backlight_device_unregister(struct intel_connector *connector)
1046 {
1047         struct intel_panel *panel = &connector->panel;
1048
1049         if (panel->backlight.device) {
1050                 backlight_device_unregister(panel->backlight.device);
1051                 panel->backlight.device = NULL;
1052         }
1053 }
1054 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1055 static int intel_backlight_device_register(struct intel_connector *connector)
1056 {
1057         return 0;
1058 }
1059 static void intel_backlight_device_unregister(struct intel_connector *connector)
1060 {
1061 }
1062 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1063
1064 /*
1065  * Note: The setup hooks can't assume pipe is set!
1066  *
1067  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1068  * appropriately when it's 0. Use VBT and/or sane defaults.
1069  */
1070 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1071 {
1072         struct drm_device *dev = connector->base.dev;
1073         struct drm_i915_private *dev_priv = dev->dev_private;
1074         struct intel_panel *panel = &connector->panel;
1075
1076         WARN_ON(panel->backlight.max == 0);
1077
1078         /* vbt value is a coefficient in range [0..255] */
1079         return scale(dev_priv->vbt.backlight.min_brightness, 0, 255,
1080                      0, panel->backlight.max);
1081 }
1082
1083 static int bdw_setup_backlight(struct intel_connector *connector)
1084 {
1085         struct drm_device *dev = connector->base.dev;
1086         struct drm_i915_private *dev_priv = dev->dev_private;
1087         struct intel_panel *panel = &connector->panel;
1088         u32 pch_ctl1, pch_ctl2, val;
1089
1090         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1091         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1092
1093         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1094         panel->backlight.max = pch_ctl2 >> 16;
1095         if (!panel->backlight.max)
1096                 return -ENODEV;
1097
1098         panel->backlight.min = get_backlight_min_vbt(connector);
1099
1100         val = bdw_get_backlight(connector);
1101         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1102
1103         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1104                 panel->backlight.level != 0;
1105
1106         return 0;
1107 }
1108
1109 static int pch_setup_backlight(struct intel_connector *connector)
1110 {
1111         struct drm_device *dev = connector->base.dev;
1112         struct drm_i915_private *dev_priv = dev->dev_private;
1113         struct intel_panel *panel = &connector->panel;
1114         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1115
1116         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1117         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1118
1119         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1120         panel->backlight.max = pch_ctl2 >> 16;
1121         if (!panel->backlight.max)
1122                 return -ENODEV;
1123
1124         panel->backlight.min = get_backlight_min_vbt(connector);
1125
1126         val = pch_get_backlight(connector);
1127         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1128
1129         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1130         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1131                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1132
1133         return 0;
1134 }
1135
1136 static int i9xx_setup_backlight(struct intel_connector *connector)
1137 {
1138         struct drm_device *dev = connector->base.dev;
1139         struct drm_i915_private *dev_priv = dev->dev_private;
1140         struct intel_panel *panel = &connector->panel;
1141         u32 ctl, val;
1142
1143         ctl = I915_READ(BLC_PWM_CTL);
1144
1145         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1146                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1147
1148         if (IS_PINEVIEW(dev))
1149                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1150
1151         panel->backlight.max = ctl >> 17;
1152         if (panel->backlight.combination_mode)
1153                 panel->backlight.max *= 0xff;
1154
1155         if (!panel->backlight.max)
1156                 return -ENODEV;
1157
1158         panel->backlight.min = get_backlight_min_vbt(connector);
1159
1160         val = i9xx_get_backlight(connector);
1161         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1162
1163         panel->backlight.enabled = panel->backlight.level != 0;
1164
1165         return 0;
1166 }
1167
1168 static int i965_setup_backlight(struct intel_connector *connector)
1169 {
1170         struct drm_device *dev = connector->base.dev;
1171         struct drm_i915_private *dev_priv = dev->dev_private;
1172         struct intel_panel *panel = &connector->panel;
1173         u32 ctl, ctl2, val;
1174
1175         ctl2 = I915_READ(BLC_PWM_CTL2);
1176         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1177         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1178
1179         ctl = I915_READ(BLC_PWM_CTL);
1180         panel->backlight.max = ctl >> 16;
1181         if (panel->backlight.combination_mode)
1182                 panel->backlight.max *= 0xff;
1183
1184         if (!panel->backlight.max)
1185                 return -ENODEV;
1186
1187         panel->backlight.min = get_backlight_min_vbt(connector);
1188
1189         val = i9xx_get_backlight(connector);
1190         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1191
1192         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1193                 panel->backlight.level != 0;
1194
1195         return 0;
1196 }
1197
1198 static int vlv_setup_backlight(struct intel_connector *connector)
1199 {
1200         struct drm_device *dev = connector->base.dev;
1201         struct drm_i915_private *dev_priv = dev->dev_private;
1202         struct intel_panel *panel = &connector->panel;
1203         enum pipe pipe;
1204         u32 ctl, ctl2, val;
1205
1206         for_each_pipe(pipe) {
1207                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1208
1209                 /* Skip if the modulation freq is already set */
1210                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1211                         continue;
1212
1213                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1214                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1215                            cur_val);
1216         }
1217
1218         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
1219         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1220
1221         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
1222         panel->backlight.max = ctl >> 16;
1223         if (!panel->backlight.max)
1224                 return -ENODEV;
1225
1226         panel->backlight.min = get_backlight_min_vbt(connector);
1227
1228         val = _vlv_get_backlight(dev, PIPE_A);
1229         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1230
1231         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1232                 panel->backlight.level != 0;
1233
1234         return 0;
1235 }
1236
1237 int intel_panel_setup_backlight(struct drm_connector *connector)
1238 {
1239         struct drm_device *dev = connector->dev;
1240         struct drm_i915_private *dev_priv = dev->dev_private;
1241         struct intel_connector *intel_connector = to_intel_connector(connector);
1242         struct intel_panel *panel = &intel_connector->panel;
1243         unsigned long flags;
1244         int ret;
1245
1246         if (!dev_priv->vbt.backlight.present) {
1247                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1248                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1249                 } else {
1250                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1251                         return 0;
1252                 }
1253         }
1254
1255         /* set level and max in panel struct */
1256         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
1257         ret = dev_priv->display.setup_backlight(intel_connector);
1258         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
1259
1260         if (ret) {
1261                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1262                               connector->name);
1263                 return ret;
1264         }
1265
1266         intel_backlight_device_register(intel_connector);
1267
1268         panel->backlight.present = true;
1269
1270         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1271                       "sysfs interface %sregistered\n",
1272                       panel->backlight.enabled ? "enabled" : "disabled",
1273                       panel->backlight.level, panel->backlight.max,
1274                       panel->backlight.device ? "" : "not ");
1275
1276         return 0;
1277 }
1278
1279 void intel_panel_destroy_backlight(struct drm_connector *connector)
1280 {
1281         struct intel_connector *intel_connector = to_intel_connector(connector);
1282         struct intel_panel *panel = &intel_connector->panel;
1283
1284         panel->backlight.present = false;
1285         intel_backlight_device_unregister(intel_connector);
1286 }
1287
1288 /* Set up chip specific backlight functions */
1289 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1290 {
1291         struct drm_i915_private *dev_priv = dev->dev_private;
1292
1293         if (IS_BROADWELL(dev)) {
1294                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1295                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1296                 dev_priv->display.disable_backlight = pch_disable_backlight;
1297                 dev_priv->display.set_backlight = bdw_set_backlight;
1298                 dev_priv->display.get_backlight = bdw_get_backlight;
1299         } else if (HAS_PCH_SPLIT(dev)) {
1300                 dev_priv->display.setup_backlight = pch_setup_backlight;
1301                 dev_priv->display.enable_backlight = pch_enable_backlight;
1302                 dev_priv->display.disable_backlight = pch_disable_backlight;
1303                 dev_priv->display.set_backlight = pch_set_backlight;
1304                 dev_priv->display.get_backlight = pch_get_backlight;
1305         } else if (IS_VALLEYVIEW(dev)) {
1306                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1307                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1308                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1309                 dev_priv->display.set_backlight = vlv_set_backlight;
1310                 dev_priv->display.get_backlight = vlv_get_backlight;
1311         } else if (IS_GEN4(dev)) {
1312                 dev_priv->display.setup_backlight = i965_setup_backlight;
1313                 dev_priv->display.enable_backlight = i965_enable_backlight;
1314                 dev_priv->display.disable_backlight = i965_disable_backlight;
1315                 dev_priv->display.set_backlight = i9xx_set_backlight;
1316                 dev_priv->display.get_backlight = i9xx_get_backlight;
1317         } else {
1318                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1319                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1320                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1321                 dev_priv->display.set_backlight = i9xx_set_backlight;
1322                 dev_priv->display.get_backlight = i9xx_get_backlight;
1323         }
1324 }
1325
1326 int intel_panel_init(struct intel_panel *panel,
1327                      struct drm_display_mode *fixed_mode,
1328                      struct drm_display_mode *downclock_mode)
1329 {
1330         panel->fixed_mode = fixed_mode;
1331         panel->downclock_mode = downclock_mode;
1332
1333         return 0;
1334 }
1335
1336 void intel_panel_fini(struct intel_panel *panel)
1337 {
1338         struct intel_connector *intel_connector =
1339                 container_of(panel, struct intel_connector, panel);
1340
1341         if (panel->fixed_mode)
1342                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1343
1344         if (panel->downclock_mode)
1345                 drm_mode_destroy(intel_connector->base.dev,
1346                                 panel->downclock_mode);
1347 }