drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/moduleparam.h>
  34 #include "intel_drv.h"
  35
  36 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 = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 423                         (target_max - target_min), source_max - source_min);
 424         target_val += target_min;
 425
 426         return target_val;
 427 }
 428
 429 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 430 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 431                                    u32 user_level, u32 user_max)
 432 {
 433         struct intel_panel *panel = &connector->panel;
 434
 435         return scale(user_level, 0, user_max,
 436                      panel->backlight.min, panel->backlight.max);
 437 }
 438
 439 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 440  * to [hw_min..hw_max]. */
 441 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 442                                    u32 user_level, u32 user_max)
 443 {
 444         struct intel_panel *panel = &connector->panel;
 445         u32 hw_level;
 446
 447         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 448         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 449
 450         return hw_level;
 451 }
 452
 453 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 454 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 455                                    u32 hw_level, u32 user_max)
 456 {
 457         struct intel_panel *panel = &connector->panel;
 458
 459         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 460                      0, user_max);
 461 }
 462
 463 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 464                                           u32 val)
 465 {
 466         struct drm_device *dev = connector->base.dev;
 467         struct drm_i915_private *dev_priv = dev->dev_private;
 468         struct intel_panel *panel = &connector->panel;
 469
 470         WARN_ON(panel->backlight.max == 0);
 471
 472         if (i915.invert_brightness < 0)
 473                 return val;
 474
 475         if (i915.invert_brightness > 0 ||
 476             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 477                 return panel->backlight.max - val;
 478         }
 479
 480         return val;
 481 }
 482
 483 static u32 bdw_get_backlight(struct intel_connector *connector)
 484 {
 485         struct drm_device *dev = connector->base.dev;
 486         struct drm_i915_private *dev_priv = dev->dev_private;
 487
 488         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 489 }
 490
 491 static u32 pch_get_backlight(struct intel_connector *connector)
 492 {
 493         struct drm_device *dev = connector->base.dev;
 494         struct drm_i915_private *dev_priv = dev->dev_private;
 495
 496         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 497 }
 498
 499 static u32 i9xx_get_backlight(struct intel_connector *connector)
 500 {
 501         struct drm_device *dev = connector->base.dev;
 502         struct drm_i915_private *dev_priv = dev->dev_private;
 503         struct intel_panel *panel = &connector->panel;
 504         u32 val;
 505
 506         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 507         if (INTEL_INFO(dev)->gen < 4)
 508                 val >>= 1;
 509
 510         if (panel->backlight.combination_mode) {
 511                 u8 lbpc;
 512
 513                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 514                 val *= lbpc;
 515         }
 516
 517         return val;
 518 }
 519
 520 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 521 {
 522         struct drm_i915_private *dev_priv = dev->dev_private;
 523
 524         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 525                 return 0;
 526
 527         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 528 }
 529
 530 static u32 vlv_get_backlight(struct intel_connector *connector)
 531 {
 532         struct drm_device *dev = connector->base.dev;
 533         enum pipe pipe = intel_get_pipe_from_connector(connector);
 534
 535         return _vlv_get_backlight(dev, pipe);
 536 }
 537
 538 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 539 {
 540         struct drm_device *dev = connector->base.dev;
 541         struct drm_i915_private *dev_priv = dev->dev_private;
 542         struct intel_panel *panel = &connector->panel;
 543         u32 val = 0;
 544
 545         mutex_lock(&dev_priv->backlight_lock);
 546
 547         if (panel->backlight.enabled) {
 548                 val = dev_priv->display.get_backlight(connector);
 549                 val = intel_panel_compute_brightness(connector, val);
 550         }
 551
 552         mutex_unlock(&dev_priv->backlight_lock);
 553
 554         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 555         return val;
 556 }
 557
 558 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 559 {
 560         struct drm_device *dev = connector->base.dev;
 561         struct drm_i915_private *dev_priv = dev->dev_private;
 562         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 563         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 564 }
 565
 566 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 567 {
 568         struct drm_device *dev = connector->base.dev;
 569         struct drm_i915_private *dev_priv = dev->dev_private;
 570         u32 tmp;
 571
 572         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 573         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 574 }
 575
 576 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 577 {
 578         struct drm_device *dev = connector->base.dev;
 579         struct drm_i915_private *dev_priv = dev->dev_private;
 580         struct intel_panel *panel = &connector->panel;
 581         u32 tmp, mask;
 582
 583         WARN_ON(panel->backlight.max == 0);
 584
 585         if (panel->backlight.combination_mode) {
 586                 u8 lbpc;
 587
 588                 lbpc = level * 0xfe / panel->backlight.max + 1;
 589                 level /= lbpc;
 590                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 591         }
 592
 593         if (IS_GEN4(dev)) {
 594                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 595         } else {
 596                 level <<= 1;
 597                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 598         }
 599
 600         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 601         I915_WRITE(BLC_PWM_CTL, tmp | level);
 602 }
 603
 604 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 605 {
 606         struct drm_device *dev = connector->base.dev;
 607         struct drm_i915_private *dev_priv = dev->dev_private;
 608         enum pipe pipe = intel_get_pipe_from_connector(connector);
 609         u32 tmp;
 610
 611         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 612                 return;
 613
 614         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 615         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 616 }
 617
 618 static void
 619 intel_panel_actually_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
 624         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 625
 626         level = intel_panel_compute_brightness(connector, level);
 627         dev_priv->display.set_backlight(connector, level);
 628 }
 629
 630 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 631 static void intel_panel_set_backlight(struct intel_connector *connector,
 632                                       u32 user_level, u32 user_max)
 633 {
 634         struct drm_device *dev = connector->base.dev;
 635         struct drm_i915_private *dev_priv = dev->dev_private;
 636         struct intel_panel *panel = &connector->panel;
 637         enum pipe pipe = intel_get_pipe_from_connector(connector);
 638         u32 hw_level;
 639
 640         if (!panel->backlight.present || pipe == INVALID_PIPE)
 641                 return;
 642
 643         mutex_lock(&dev_priv->backlight_lock);
 644
 645         WARN_ON(panel->backlight.max == 0);
 646
 647         hw_level = scale_user_to_hw(connector, user_level, user_max);
 648         panel->backlight.level = hw_level;
 649
 650         if (panel->backlight.enabled)
 651                 intel_panel_actually_set_backlight(connector, hw_level);
 652
 653         mutex_unlock(&dev_priv->backlight_lock);
 654 }
 655
 656 /* set backlight brightness to level in range [0..max], assuming hw min is
 657  * respected.
 658  */
 659 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 660                                     u32 user_level, u32 user_max)
 661 {
 662         struct drm_device *dev = connector->base.dev;
 663         struct drm_i915_private *dev_priv = dev->dev_private;
 664         struct intel_panel *panel = &connector->panel;
 665         enum pipe pipe = intel_get_pipe_from_connector(connector);
 666         u32 hw_level;
 667
 668         if (!panel->backlight.present || pipe == INVALID_PIPE)
 669                 return;
 670
 671         mutex_lock(&dev_priv->backlight_lock);
 672
 673         WARN_ON(panel->backlight.max == 0);
 674
 675         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 676         panel->backlight.level = hw_level;
 677
 678         if (panel->backlight.device)
 679                 panel->backlight.device->props.brightness =
 680                         scale_hw_to_user(connector,
 681                                          panel->backlight.level,
 682                                          panel->backlight.device->props.max_brightness);
 683
 684         if (panel->backlight.enabled)
 685                 intel_panel_actually_set_backlight(connector, hw_level);
 686
 687         mutex_unlock(&dev_priv->backlight_lock);
 688 }
 689
 690 static void pch_disable_backlight(struct intel_connector *connector)
 691 {
 692         struct drm_device *dev = connector->base.dev;
 693         struct drm_i915_private *dev_priv = dev->dev_private;
 694         u32 tmp;
 695
 696         intel_panel_actually_set_backlight(connector, 0);
 697
 698         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 699         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 700
 701         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 702         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 703 }
 704
 705 static void i9xx_disable_backlight(struct intel_connector *connector)
 706 {
 707         intel_panel_actually_set_backlight(connector, 0);
 708 }
 709
 710 static void i965_disable_backlight(struct intel_connector *connector)
 711 {
 712         struct drm_device *dev = connector->base.dev;
 713         struct drm_i915_private *dev_priv = dev->dev_private;
 714         u32 tmp;
 715
 716         intel_panel_actually_set_backlight(connector, 0);
 717
 718         tmp = I915_READ(BLC_PWM_CTL2);
 719         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 720 }
 721
 722 static void vlv_disable_backlight(struct intel_connector *connector)
 723 {
 724         struct drm_device *dev = connector->base.dev;
 725         struct drm_i915_private *dev_priv = dev->dev_private;
 726         enum pipe pipe = intel_get_pipe_from_connector(connector);
 727         u32 tmp;
 728
 729         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 730                 return;
 731
 732         intel_panel_actually_set_backlight(connector, 0);
 733
 734         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 735         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 736 }
 737
 738 void intel_panel_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         struct intel_panel *panel = &connector->panel;
 743         enum pipe pipe = intel_get_pipe_from_connector(connector);
 744
 745         if (!panel->backlight.present || pipe == INVALID_PIPE)
 746                 return;
 747
 748         /*
 749          * Do not disable backlight on the vgaswitcheroo path. When switching
 750          * away from i915, the other client may depend on i915 to handle the
 751          * backlight. This will leave the backlight on unnecessarily when
 752          * another client is not activated.
 753          */
 754         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 755                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 756                 return;
 757         }
 758
 759         mutex_lock(&dev_priv->backlight_lock);
 760
 761         if (panel->backlight.device)
 762                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 763         panel->backlight.enabled = false;
 764         dev_priv->display.disable_backlight(connector);
 765
 766         mutex_unlock(&dev_priv->backlight_lock);
 767 }
 768
 769 static void bdw_enable_backlight(struct intel_connector *connector)
 770 {
 771         struct drm_device *dev = connector->base.dev;
 772         struct drm_i915_private *dev_priv = dev->dev_private;
 773         struct intel_panel *panel = &connector->panel;
 774         u32 pch_ctl1, pch_ctl2;
 775
 776         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 777         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 778                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 779                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 780                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 781         }
 782
 783         pch_ctl2 = panel->backlight.max << 16;
 784         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 785
 786         pch_ctl1 = 0;
 787         if (panel->backlight.active_low_pwm)
 788                 pch_ctl1 |= BLM_PCH_POLARITY;
 789
 790         /* After LPT, override is the default. */
 791         if (HAS_PCH_LPT(dev_priv))
 792                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 793
 794         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 795         POSTING_READ(BLC_PWM_PCH_CTL1);
 796         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 797
 798         /* This won't stick until the above enable. */
 799         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 800 }
 801
 802 static void pch_enable_backlight(struct intel_connector *connector)
 803 {
 804         struct drm_device *dev = connector->base.dev;
 805         struct drm_i915_private *dev_priv = dev->dev_private;
 806         struct intel_panel *panel = &connector->panel;
 807         enum pipe pipe = intel_get_pipe_from_connector(connector);
 808         enum transcoder cpu_transcoder =
 809                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 810         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 811
 812         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 813         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 814                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 815                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 816                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 817         }
 818
 819         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 820         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 821                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 822                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 823                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 824         }
 825
 826         if (cpu_transcoder == TRANSCODER_EDP)
 827                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 828         else
 829                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 830         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 831         POSTING_READ(BLC_PWM_CPU_CTL2);
 832         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 833
 834         /* This won't stick until the above enable. */
 835         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 836
 837         pch_ctl2 = panel->backlight.max << 16;
 838         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 839
 840         pch_ctl1 = 0;
 841         if (panel->backlight.active_low_pwm)
 842                 pch_ctl1 |= BLM_PCH_POLARITY;
 843
 844         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 845         POSTING_READ(BLC_PWM_PCH_CTL1);
 846         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 847 }
 848
 849 static void i9xx_enable_backlight(struct intel_connector *connector)
 850 {
 851         struct drm_device *dev = connector->base.dev;
 852         struct drm_i915_private *dev_priv = dev->dev_private;
 853         struct intel_panel *panel = &connector->panel;
 854         u32 ctl, freq;
 855
 856         ctl = I915_READ(BLC_PWM_CTL);
 857         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 858                 DRM_DEBUG_KMS("backlight already enabled\n");
 859                 I915_WRITE(BLC_PWM_CTL, 0);
 860         }
 861
 862         freq = panel->backlight.max;
 863         if (panel->backlight.combination_mode)
 864                 freq /= 0xff;
 865
 866         ctl = freq << 17;
 867         if (panel->backlight.combination_mode)
 868                 ctl |= BLM_LEGACY_MODE;
 869         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 870                 ctl |= BLM_POLARITY_PNV;
 871
 872         I915_WRITE(BLC_PWM_CTL, ctl);
 873         POSTING_READ(BLC_PWM_CTL);
 874
 875         /* XXX: combine this into above write? */
 876         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 877 }
 878
 879 static void i965_enable_backlight(struct intel_connector *connector)
 880 {
 881         struct drm_device *dev = connector->base.dev;
 882         struct drm_i915_private *dev_priv = dev->dev_private;
 883         struct intel_panel *panel = &connector->panel;
 884         enum pipe pipe = intel_get_pipe_from_connector(connector);
 885         u32 ctl, ctl2, freq;
 886
 887         ctl2 = I915_READ(BLC_PWM_CTL2);
 888         if (ctl2 & BLM_PWM_ENABLE) {
 889                 DRM_DEBUG_KMS("backlight already enabled\n");
 890                 ctl2 &= ~BLM_PWM_ENABLE;
 891                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 892         }
 893
 894         freq = panel->backlight.max;
 895         if (panel->backlight.combination_mode)
 896                 freq /= 0xff;
 897
 898         ctl = freq << 16;
 899         I915_WRITE(BLC_PWM_CTL, ctl);
 900
 901         ctl2 = BLM_PIPE(pipe);
 902         if (panel->backlight.combination_mode)
 903                 ctl2 |= BLM_COMBINATION_MODE;
 904         if (panel->backlight.active_low_pwm)
 905                 ctl2 |= BLM_POLARITY_I965;
 906         I915_WRITE(BLC_PWM_CTL2, ctl2);
 907         POSTING_READ(BLC_PWM_CTL2);
 908         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 909
 910         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 911 }
 912
 913 static void vlv_enable_backlight(struct intel_connector *connector)
 914 {
 915         struct drm_device *dev = connector->base.dev;
 916         struct drm_i915_private *dev_priv = dev->dev_private;
 917         struct intel_panel *panel = &connector->panel;
 918         enum pipe pipe = intel_get_pipe_from_connector(connector);
 919         u32 ctl, ctl2;
 920
 921         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 922                 return;
 923
 924         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 925         if (ctl2 & BLM_PWM_ENABLE) {
 926                 DRM_DEBUG_KMS("backlight already enabled\n");
 927                 ctl2 &= ~BLM_PWM_ENABLE;
 928                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 929         }
 930
 931         ctl = panel->backlight.max << 16;
 932         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 933
 934         /* XXX: combine this into above write? */
 935         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 936
 937         ctl2 = 0;
 938         if (panel->backlight.active_low_pwm)
 939                 ctl2 |= BLM_POLARITY_I965;
 940         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 941         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 942         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 943 }
 944
 945 void intel_panel_enable_backlight(struct intel_connector *connector)
 946 {
 947         struct drm_device *dev = connector->base.dev;
 948         struct drm_i915_private *dev_priv = dev->dev_private;
 949         struct intel_panel *panel = &connector->panel;
 950         enum pipe pipe = intel_get_pipe_from_connector(connector);
 951
 952         if (!panel->backlight.present || pipe == INVALID_PIPE)
 953                 return;
 954
 955         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 956
 957         mutex_lock(&dev_priv->backlight_lock);
 958
 959         WARN_ON(panel->backlight.max == 0);
 960
 961         if (panel->backlight.level == 0) {
 962                 panel->backlight.level = panel->backlight.max;
 963                 if (panel->backlight.device)
 964                         panel->backlight.device->props.brightness =
 965                                 scale_hw_to_user(connector,
 966                                                  panel->backlight.level,
 967                                                  panel->backlight.device->props.max_brightness);
 968         }
 969
 970         dev_priv->display.enable_backlight(connector);
 971         panel->backlight.enabled = true;
 972         if (panel->backlight.device)
 973                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
 974
 975         mutex_unlock(&dev_priv->backlight_lock);
 976 }
 977
 978 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 979 static int intel_backlight_device_update_status(struct backlight_device *bd)
 980 {
 981         struct intel_connector *connector = bl_get_data(bd);
 982         struct intel_panel *panel = &connector->panel;
 983         struct drm_device *dev = connector->base.dev;
 984
 985         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 986         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 987                       bd->props.brightness, bd->props.max_brightness);
 988         intel_panel_set_backlight(connector, bd->props.brightness,
 989                                   bd->props.max_brightness);
 990
 991         /*
 992          * Allow flipping bl_power as a sub-state of enabled. Sadly the
 993          * backlight class device does not make it easy to to differentiate
 994          * between callbacks for brightness and bl_power, so our backlight_power
 995          * callback needs to take this into account.
 996          */
 997         if (panel->backlight.enabled) {
 998                 if (panel->backlight_power) {
 999                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1000                                 bd->props.brightness != 0;
1001                         panel->backlight_power(connector, enable);
1002                 }
1003         } else {
1004                 bd->props.power = FB_BLANK_POWERDOWN;
1005         }
1006
1007         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1008         return 0;
1009 }
1010
1011 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1012 {
1013         struct intel_connector *connector = bl_get_data(bd);
1014         struct drm_device *dev = connector->base.dev;
1015         struct drm_i915_private *dev_priv = dev->dev_private;
1016         u32 hw_level;
1017         int ret;
1018
1019         intel_runtime_pm_get(dev_priv);
1020         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1021
1022         hw_level = intel_panel_get_backlight(connector);
1023         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1024
1025         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1026         intel_runtime_pm_put(dev_priv);
1027
1028         return ret;
1029 }
1030
1031 static const struct backlight_ops intel_backlight_device_ops = {
1032         .update_status = intel_backlight_device_update_status,
1033         .get_brightness = intel_backlight_device_get_brightness,
1034 };
1035
1036 static int intel_backlight_device_register(struct intel_connector *connector)
1037 {
1038         struct intel_panel *panel = &connector->panel;
1039         struct backlight_properties props;
1040
1041         if (WARN_ON(panel->backlight.device))
1042                 return -ENODEV;
1043
1044         if (!panel->backlight.present)
1045                 return 0;
1046
1047         WARN_ON(panel->backlight.max == 0);
1048
1049         memset(&props, 0, sizeof(props));
1050         props.type = BACKLIGHT_RAW;
1051
1052         /*
1053          * Note: Everything should work even if the backlight device max
1054          * presented to the userspace is arbitrarily chosen.
1055          */
1056         props.max_brightness = panel->backlight.max;
1057         props.brightness = scale_hw_to_user(connector,
1058                                             panel->backlight.level,
1059                                             props.max_brightness);
1060
1061         if (panel->backlight.enabled)
1062                 props.power = FB_BLANK_UNBLANK;
1063         else
1064                 props.power = FB_BLANK_POWERDOWN;
1065
1066         /*
1067          * Note: using the same name independent of the connector prevents
1068          * registration of multiple backlight devices in the driver.
1069          */
1070         panel->backlight.device =
1071                 backlight_device_register("intel_backlight",
1072                                           connector->base.kdev,
1073                                           connector,
1074                                           &intel_backlight_device_ops, &props);
1075
1076         if (IS_ERR(panel->backlight.device)) {
1077                 DRM_ERROR("Failed to register backlight: %ld\n",
1078                           PTR_ERR(panel->backlight.device));
1079                 panel->backlight.device = NULL;
1080                 return -ENODEV;
1081         }
1082
1083         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1084                       connector->base.name);
1085
1086         return 0;
1087 }
1088
1089 static void intel_backlight_device_unregister(struct intel_connector *connector)
1090 {
1091         struct intel_panel *panel = &connector->panel;
1092
1093         if (panel->backlight.device) {
1094                 backlight_device_unregister(panel->backlight.device);
1095                 panel->backlight.device = NULL;
1096         }
1097 }
1098 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1099 static int intel_backlight_device_register(struct intel_connector *connector)
1100 {
1101         return 0;
1102 }
1103 static void intel_backlight_device_unregister(struct intel_connector *connector)
1104 {
1105 }
1106 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1107
1108 /*
1109  * Note: The setup hooks can't assume pipe is set!
1110  *
1111  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1112  * appropriately when it's 0. Use VBT and/or sane defaults.
1113  */
1114 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1115 {
1116         struct drm_device *dev = connector->base.dev;
1117         struct drm_i915_private *dev_priv = dev->dev_private;
1118         struct intel_panel *panel = &connector->panel;
1119
1120         WARN_ON(panel->backlight.max == 0);
1121
1122         /* vbt value is a coefficient in range [0..255] */
1123         return scale(dev_priv->vbt.backlight.min_brightness, 0, 255,
1124                      0, panel->backlight.max);
1125 }
1126
1127 static int bdw_setup_backlight(struct intel_connector *connector, enum pipe unused)
1128 {
1129         struct drm_device *dev = connector->base.dev;
1130         struct drm_i915_private *dev_priv = dev->dev_private;
1131         struct intel_panel *panel = &connector->panel;
1132         u32 pch_ctl1, pch_ctl2, val;
1133
1134         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1135         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1136
1137         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1138         panel->backlight.max = pch_ctl2 >> 16;
1139         if (!panel->backlight.max)
1140                 return -ENODEV;
1141
1142         panel->backlight.min = get_backlight_min_vbt(connector);
1143
1144         val = bdw_get_backlight(connector);
1145         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1146
1147         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1148                 panel->backlight.level != 0;
1149
1150         return 0;
1151 }
1152
1153 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1154 {
1155         struct drm_device *dev = connector->base.dev;
1156         struct drm_i915_private *dev_priv = dev->dev_private;
1157         struct intel_panel *panel = &connector->panel;
1158         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1159
1160         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1161         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1162
1163         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1164         panel->backlight.max = pch_ctl2 >> 16;
1165         if (!panel->backlight.max)
1166                 return -ENODEV;
1167
1168         panel->backlight.min = get_backlight_min_vbt(connector);
1169
1170         val = pch_get_backlight(connector);
1171         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1172
1173         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1174         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1175                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1176
1177         return 0;
1178 }
1179
1180 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1181 {
1182         struct drm_device *dev = connector->base.dev;
1183         struct drm_i915_private *dev_priv = dev->dev_private;
1184         struct intel_panel *panel = &connector->panel;
1185         u32 ctl, val;
1186
1187         ctl = I915_READ(BLC_PWM_CTL);
1188
1189         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1190                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1191
1192         if (IS_PINEVIEW(dev))
1193                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1194
1195         panel->backlight.max = ctl >> 17;
1196         if (panel->backlight.combination_mode)
1197                 panel->backlight.max *= 0xff;
1198
1199         if (!panel->backlight.max)
1200                 return -ENODEV;
1201
1202         panel->backlight.min = get_backlight_min_vbt(connector);
1203
1204         val = i9xx_get_backlight(connector);
1205         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1206
1207         panel->backlight.enabled = panel->backlight.level != 0;
1208
1209         return 0;
1210 }
1211
1212 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1213 {
1214         struct drm_device *dev = connector->base.dev;
1215         struct drm_i915_private *dev_priv = dev->dev_private;
1216         struct intel_panel *panel = &connector->panel;
1217         u32 ctl, ctl2, val;
1218
1219         ctl2 = I915_READ(BLC_PWM_CTL2);
1220         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1221         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1222
1223         ctl = I915_READ(BLC_PWM_CTL);
1224         panel->backlight.max = ctl >> 16;
1225         if (panel->backlight.combination_mode)
1226                 panel->backlight.max *= 0xff;
1227
1228         if (!panel->backlight.max)
1229                 return -ENODEV;
1230
1231         panel->backlight.min = get_backlight_min_vbt(connector);
1232
1233         val = i9xx_get_backlight(connector);
1234         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1235
1236         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1237                 panel->backlight.level != 0;
1238
1239         return 0;
1240 }
1241
1242 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1243 {
1244         struct drm_device *dev = connector->base.dev;
1245         struct drm_i915_private *dev_priv = dev->dev_private;
1246         struct intel_panel *panel = &connector->panel;
1247         enum pipe p;
1248         u32 ctl, ctl2, val;
1249
1250         for_each_pipe(dev_priv, p) {
1251                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1252
1253                 /* Skip if the modulation freq is already set */
1254                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1255                         continue;
1256
1257                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1258                 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1259                            cur_val);
1260         }
1261
1262         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1263                 return -ENODEV;
1264
1265         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1266         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1267
1268         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1269         panel->backlight.max = ctl >> 16;
1270         if (!panel->backlight.max)
1271                 return -ENODEV;
1272
1273         panel->backlight.min = get_backlight_min_vbt(connector);
1274
1275         val = _vlv_get_backlight(dev, pipe);
1276         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1277
1278         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1279                 panel->backlight.level != 0;
1280
1281         return 0;
1282 }
1283
1284 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1285 {
1286         struct drm_device *dev = connector->dev;
1287         struct drm_i915_private *dev_priv = dev->dev_private;
1288         struct intel_connector *intel_connector = to_intel_connector(connector);
1289         struct intel_panel *panel = &intel_connector->panel;
1290         int ret;
1291
1292         if (!dev_priv->vbt.backlight.present) {
1293                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1294                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1295                 } else {
1296                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1297                         return 0;
1298                 }
1299         }
1300
1301         /* set level and max in panel struct */
1302         mutex_lock(&dev_priv->backlight_lock);
1303         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1304         mutex_unlock(&dev_priv->backlight_lock);
1305
1306         if (ret) {
1307                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1308                               connector->name);
1309                 return ret;
1310         }
1311
1312         panel->backlight.present = true;
1313
1314         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1315                       connector->name,
1316                       panel->backlight.enabled ? "enabled" : "disabled",
1317                       panel->backlight.level, panel->backlight.max);
1318
1319         return 0;
1320 }
1321
1322 void intel_panel_destroy_backlight(struct drm_connector *connector)
1323 {
1324         struct intel_connector *intel_connector = to_intel_connector(connector);
1325         struct intel_panel *panel = &intel_connector->panel;
1326
1327         panel->backlight.present = false;
1328 }
1329
1330 /* Set up chip specific backlight functions */
1331 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1332 {
1333         struct drm_i915_private *dev_priv = dev->dev_private;
1334
1335         if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) {
1336                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1337                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1338                 dev_priv->display.disable_backlight = pch_disable_backlight;
1339                 dev_priv->display.set_backlight = bdw_set_backlight;
1340                 dev_priv->display.get_backlight = bdw_get_backlight;
1341         } else if (HAS_PCH_SPLIT(dev)) {
1342                 dev_priv->display.setup_backlight = pch_setup_backlight;
1343                 dev_priv->display.enable_backlight = pch_enable_backlight;
1344                 dev_priv->display.disable_backlight = pch_disable_backlight;
1345                 dev_priv->display.set_backlight = pch_set_backlight;
1346                 dev_priv->display.get_backlight = pch_get_backlight;
1347         } else if (IS_VALLEYVIEW(dev)) {
1348                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1349                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1350                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1351                 dev_priv->display.set_backlight = vlv_set_backlight;
1352                 dev_priv->display.get_backlight = vlv_get_backlight;
1353         } else if (IS_GEN4(dev)) {
1354                 dev_priv->display.setup_backlight = i965_setup_backlight;
1355                 dev_priv->display.enable_backlight = i965_enable_backlight;
1356                 dev_priv->display.disable_backlight = i965_disable_backlight;
1357                 dev_priv->display.set_backlight = i9xx_set_backlight;
1358                 dev_priv->display.get_backlight = i9xx_get_backlight;
1359         } else {
1360                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1361                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1362                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1363                 dev_priv->display.set_backlight = i9xx_set_backlight;
1364                 dev_priv->display.get_backlight = i9xx_get_backlight;
1365         }
1366 }
1367
1368 int intel_panel_init(struct intel_panel *panel,
1369                      struct drm_display_mode *fixed_mode,
1370                      struct drm_display_mode *downclock_mode)
1371 {
1372         panel->fixed_mode = fixed_mode;
1373         panel->downclock_mode = downclock_mode;
1374
1375         return 0;
1376 }
1377
1378 void intel_panel_fini(struct intel_panel *panel)
1379 {
1380         struct intel_connector *intel_connector =
1381                 container_of(panel, struct intel_connector, panel);
1382
1383         if (panel->fixed_mode)
1384                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1385
1386         if (panel->downclock_mode)
1387                 drm_mode_destroy(intel_connector->base.dev,
1388                                 panel->downclock_mode);
1389 }
1390
1391 void intel_backlight_register(struct drm_device *dev)
1392 {
1393         struct intel_connector *connector;
1394
1395         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1396                 intel_backlight_device_register(connector);
1397 }
1398
1399 void intel_backlight_unregister(struct drm_device *dev)
1400 {
1401         struct intel_connector *connector;
1402
1403         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1404                 intel_backlight_device_unregister(connector);
1405 }