kernel/drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/kernel.h>
  34 #include <linux/moduleparam.h>
  35 #include "intel_drv.h"
  36
  37 void
  38 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  39                        struct drm_display_mode *adjusted_mode)
  40 {
  41         drm_mode_copy(adjusted_mode, fixed_mode);
  42
  43         drm_mode_set_crtcinfo(adjusted_mode, 0);
  44 }
  45
  46 /**
  47  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  48  * @dev: drm device
  49  * @fixed_mode : panel native mode
  50  * @connector: LVDS/eDP connector
  51  *
  52  * Return downclock_avail
  53  * Find the reduced downclock for LVDS/eDP in EDID.
  54  */
  55 struct drm_display_mode *
  56 intel_find_panel_downclock(struct drm_device *dev,
  57                         struct drm_display_mode *fixed_mode,
  58                         struct drm_connector *connector)
  59 {
  60         struct drm_display_mode *scan, *tmp_mode;
  61         int temp_downclock;
  62
  63         temp_downclock = fixed_mode->clock;
  64         tmp_mode = NULL;
  65
  66         list_for_each_entry(scan, &connector->probed_modes, head) {
  67                 /*
  68                  * If one mode has the same resolution with the fixed_panel
  69                  * mode while they have the different refresh rate, it means
  70                  * that the reduced downclock is found. In such
  71                  * case we can set the different FPx0/1 to dynamically select
  72                  * between low and high frequency.
  73                  */
  74                 if (scan->hdisplay == fixed_mode->hdisplay &&
  75                     scan->hsync_start == fixed_mode->hsync_start &&
  76                     scan->hsync_end == fixed_mode->hsync_end &&
  77                     scan->htotal == fixed_mode->htotal &&
  78                     scan->vdisplay == fixed_mode->vdisplay &&
  79                     scan->vsync_start == fixed_mode->vsync_start &&
  80                     scan->vsync_end == fixed_mode->vsync_end &&
  81                     scan->vtotal == fixed_mode->vtotal) {
  82                         if (scan->clock < temp_downclock) {
  83                                 /*
  84                                  * The downclock is already found. But we
  85                                  * expect to find the lower downclock.
  86                                  */
  87                                 temp_downclock = scan->clock;
  88                                 tmp_mode = scan;
  89                         }
  90                 }
  91         }
  92
  93         if (temp_downclock < fixed_mode->clock)
  94                 return drm_mode_duplicate(dev, tmp_mode);
  95         else
  96                 return NULL;
  97 }
  98
  99 /* adjusted_mode has been preset to be the panel's fixed mode */
 100 void
 101 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 102                         struct intel_crtc_state *pipe_config,
 103                         int fitting_mode)
 104 {
 105         struct drm_display_mode *adjusted_mode;
 106         int x, y, width, height;
 107
 108         adjusted_mode = &pipe_config->base.adjusted_mode;
 109
 110         x = y = width = height = 0;
 111
 112         /* Native modes don't need fitting */
 113         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 114             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 115                 goto done;
 116
 117         switch (fitting_mode) {
 118         case DRM_MODE_SCALE_CENTER:
 119                 width = pipe_config->pipe_src_w;
 120                 height = pipe_config->pipe_src_h;
 121                 x = (adjusted_mode->hdisplay - width + 1)/2;
 122                 y = (adjusted_mode->vdisplay - height + 1)/2;
 123                 break;
 124
 125         case DRM_MODE_SCALE_ASPECT:
 126                 /* Scale but preserve the aspect ratio */
 127                 {
 128                         u32 scaled_width = adjusted_mode->hdisplay
 129                                 * pipe_config->pipe_src_h;
 130                         u32 scaled_height = pipe_config->pipe_src_w
 131                                 * adjusted_mode->vdisplay;
 132                         if (scaled_width > scaled_height) { /* pillar */
 133                                 width = scaled_height / pipe_config->pipe_src_h;
 134                                 if (width & 1)
 135                                         width++;
 136                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
 137                                 y = 0;
 138                                 height = adjusted_mode->vdisplay;
 139                         } else if (scaled_width < scaled_height) { /* letter */
 140                                 height = scaled_width / pipe_config->pipe_src_w;
 141                                 if (height & 1)
 142                                     height++;
 143                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
 144                                 x = 0;
 145                                 width = adjusted_mode->hdisplay;
 146                         } else {
 147                                 x = y = 0;
 148                                 width = adjusted_mode->hdisplay;
 149                                 height = adjusted_mode->vdisplay;
 150                         }
 151                 }
 152                 break;
 153
 154         case DRM_MODE_SCALE_FULLSCREEN:
 155                 x = y = 0;
 156                 width = adjusted_mode->hdisplay;
 157                 height = adjusted_mode->vdisplay;
 158                 break;
 159
 160         default:
 161                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 162                 return;
 163         }
 164
 165 done:
 166         pipe_config->pch_pfit.pos = (x << 16) | y;
 167         pipe_config->pch_pfit.size = (width << 16) | height;
 168         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 169 }
 170
 171 static void
 172 centre_horizontally(struct drm_display_mode *mode,
 173                     int width)
 174 {
 175         u32 border, sync_pos, blank_width, sync_width;
 176
 177         /* keep the hsync and hblank widths constant */
 178         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 179         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 180         sync_pos = (blank_width - sync_width + 1) / 2;
 181
 182         border = (mode->hdisplay - width + 1) / 2;
 183         border += border & 1; /* make the border even */
 184
 185         mode->crtc_hdisplay = width;
 186         mode->crtc_hblank_start = width + border;
 187         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 188
 189         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 190         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 191 }
 192
 193 static void
 194 centre_vertically(struct drm_display_mode *mode,
 195                   int height)
 196 {
 197         u32 border, sync_pos, blank_width, sync_width;
 198
 199         /* keep the vsync and vblank widths constant */
 200         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 201         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 202         sync_pos = (blank_width - sync_width + 1) / 2;
 203
 204         border = (mode->vdisplay - height + 1) / 2;
 205
 206         mode->crtc_vdisplay = height;
 207         mode->crtc_vblank_start = height + border;
 208         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 209
 210         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 211         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 212 }
 213
 214 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 215 {
 216         /*
 217          * Floating point operation is not supported. So the FACTOR
 218          * is defined, which can avoid the floating point computation
 219          * when calculating the panel ratio.
 220          */
 221 #define ACCURACY 12
 222 #define FACTOR (1 << ACCURACY)
 223         u32 ratio = source * FACTOR / target;
 224         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 225 }
 226
 227 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 228                               u32 *pfit_control)
 229 {
 230         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 231         u32 scaled_width = adjusted_mode->hdisplay *
 232                 pipe_config->pipe_src_h;
 233         u32 scaled_height = pipe_config->pipe_src_w *
 234                 adjusted_mode->vdisplay;
 235
 236         /* 965+ is easy, it does everything in hw */
 237         if (scaled_width > scaled_height)
 238                 *pfit_control |= PFIT_ENABLE |
 239                         PFIT_SCALING_PILLAR;
 240         else if (scaled_width < scaled_height)
 241                 *pfit_control |= PFIT_ENABLE |
 242                         PFIT_SCALING_LETTER;
 243         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 244                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 245 }
 246
 247 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 248                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 249                               u32 *border)
 250 {
 251         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 252         u32 scaled_width = adjusted_mode->hdisplay *
 253                 pipe_config->pipe_src_h;
 254         u32 scaled_height = pipe_config->pipe_src_w *
 255                 adjusted_mode->vdisplay;
 256         u32 bits;
 257
 258         /*
 259          * For earlier chips we have to calculate the scaling
 260          * ratio by hand and program it into the
 261          * PFIT_PGM_RATIO register
 262          */
 263         if (scaled_width > scaled_height) { /* pillar */
 264                 centre_horizontally(adjusted_mode,
 265                                     scaled_height /
 266                                     pipe_config->pipe_src_h);
 267
 268                 *border = LVDS_BORDER_ENABLE;
 269                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 270                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 271                                                     adjusted_mode->vdisplay);
 272
 273                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 274                                              bits << PFIT_VERT_SCALE_SHIFT);
 275                         *pfit_control |= (PFIT_ENABLE |
 276                                           VERT_INTERP_BILINEAR |
 277                                           HORIZ_INTERP_BILINEAR);
 278                 }
 279         } else if (scaled_width < scaled_height) { /* letter */
 280                 centre_vertically(adjusted_mode,
 281                                   scaled_width /
 282                                   pipe_config->pipe_src_w);
 283
 284                 *border = LVDS_BORDER_ENABLE;
 285                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 286                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 287                                                     adjusted_mode->hdisplay);
 288
 289                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 290                                              bits << PFIT_VERT_SCALE_SHIFT);
 291                         *pfit_control |= (PFIT_ENABLE |
 292                                           VERT_INTERP_BILINEAR |
 293                                           HORIZ_INTERP_BILINEAR);
 294                 }
 295         } else {
 296                 /* Aspects match, Let hw scale both directions */
 297                 *pfit_control |= (PFIT_ENABLE |
 298                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 299                                   VERT_INTERP_BILINEAR |
 300                                   HORIZ_INTERP_BILINEAR);
 301         }
 302 }
 303
 304 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 305                               struct intel_crtc_state *pipe_config,
 306                               int fitting_mode)
 307 {
 308         struct drm_device *dev = intel_crtc->base.dev;
 309         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 310         struct drm_display_mode *adjusted_mode;
 311
 312         adjusted_mode = &pipe_config->base.adjusted_mode;
 313
 314         /* Native modes don't need fitting */
 315         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 316             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 317                 goto out;
 318
 319         switch (fitting_mode) {
 320         case DRM_MODE_SCALE_CENTER:
 321                 /*
 322                  * For centered modes, we have to calculate border widths &
 323                  * heights and modify the values programmed into the CRTC.
 324                  */
 325                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 326                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 327                 border = LVDS_BORDER_ENABLE;
 328                 break;
 329         case DRM_MODE_SCALE_ASPECT:
 330                 /* Scale but preserve the aspect ratio */
 331                 if (INTEL_INFO(dev)->gen >= 4)
 332                         i965_scale_aspect(pipe_config, &pfit_control);
 333                 else
 334                         i9xx_scale_aspect(pipe_config, &pfit_control,
 335                                           &pfit_pgm_ratios, &border);
 336                 break;
 337         case DRM_MODE_SCALE_FULLSCREEN:
 338                 /*
 339                  * Full scaling, even if it changes the aspect ratio.
 340                  * Fortunately this is all done for us in hw.
 341                  */
 342                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 343                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 344                         pfit_control |= PFIT_ENABLE;
 345                         if (INTEL_INFO(dev)->gen >= 4)
 346                                 pfit_control |= PFIT_SCALING_AUTO;
 347                         else
 348                                 pfit_control |= (VERT_AUTO_SCALE |
 349                                                  VERT_INTERP_BILINEAR |
 350                                                  HORIZ_AUTO_SCALE |
 351                                                  HORIZ_INTERP_BILINEAR);
 352                 }
 353                 break;
 354         default:
 355                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 356                 return;
 357         }
 358
 359         /* 965+ wants fuzzy fitting */
 360         /* FIXME: handle multiple panels by failing gracefully */
 361         if (INTEL_INFO(dev)->gen >= 4)
 362                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 363                                  PFIT_FILTER_FUZZY);
 364
 365 out:
 366         if ((pfit_control & PFIT_ENABLE) == 0) {
 367                 pfit_control = 0;
 368                 pfit_pgm_ratios = 0;
 369         }
 370
 371         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 372         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 373                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 374
 375         pipe_config->gmch_pfit.control = pfit_control;
 376         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 377         pipe_config->gmch_pfit.lvds_border_bits = border;
 378 }
 379
 380 enum drm_connector_status
 381 intel_panel_detect(struct drm_device *dev)
 382 {
 383         struct drm_i915_private *dev_priv = dev->dev_private;
 384
 385         /* Assume that the BIOS does not lie through the OpRegion... */
 386         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 387                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 388                         connector_status_connected :
 389                         connector_status_disconnected;
 390         }
 391
 392         switch (i915.panel_ignore_lid) {
 393         case -2:
 394                 return connector_status_connected;
 395         case -1:
 396                 return connector_status_disconnected;
 397         default:
 398                 return connector_status_unknown;
 399         }
 400 }
 401
 402 /**
 403  * scale - scale values from one range to another
 404  *
 405  * @source_val: value in range [@source_min..@source_max]
 406  *
 407  * Return @source_val in range [@source_min..@source_max] scaled to range
 408  * [@target_min..@target_max].
 409  */
 410 static uint32_t scale(uint32_t source_val,
 411                       uint32_t source_min, uint32_t source_max,
 412                       uint32_t target_min, uint32_t target_max)
 413 {
 414         uint64_t target_val;
 415
 416         WARN_ON(source_min > source_max);
 417         WARN_ON(target_min > target_max);
 418
 419         /* defensive */
 420         source_val = clamp(source_val, source_min, source_max);
 421
 422         /* avoid overflows */
 423         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 424                         (target_max - target_min), 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         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 526                 return 0;
 527
 528         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 529 }
 530
 531 static u32 vlv_get_backlight(struct intel_connector *connector)
 532 {
 533         struct drm_device *dev = connector->base.dev;
 534         enum pipe pipe = intel_get_pipe_from_connector(connector);
 535
 536         return _vlv_get_backlight(dev, pipe);
 537 }
 538
 539 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 540 {
 541         struct drm_device *dev = connector->base.dev;
 542         struct drm_i915_private *dev_priv = dev->dev_private;
 543         struct intel_panel *panel = &connector->panel;
 544         u32 val = 0;
 545
 546         mutex_lock(&dev_priv->backlight_lock);
 547
 548         if (panel->backlight.enabled) {
 549                 val = dev_priv->display.get_backlight(connector);
 550                 val = intel_panel_compute_brightness(connector, val);
 551         }
 552
 553         mutex_unlock(&dev_priv->backlight_lock);
 554
 555         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 556         return val;
 557 }
 558
 559 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 560 {
 561         struct drm_device *dev = connector->base.dev;
 562         struct drm_i915_private *dev_priv = dev->dev_private;
 563         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 564         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 565 }
 566
 567 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 568 {
 569         struct drm_device *dev = connector->base.dev;
 570         struct drm_i915_private *dev_priv = dev->dev_private;
 571         u32 tmp;
 572
 573         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 574         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 575 }
 576
 577 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 578 {
 579         struct drm_device *dev = connector->base.dev;
 580         struct drm_i915_private *dev_priv = dev->dev_private;
 581         struct intel_panel *panel = &connector->panel;
 582         u32 tmp, mask;
 583
 584         WARN_ON(panel->backlight.max == 0);
 585
 586         if (panel->backlight.combination_mode) {
 587                 u8 lbpc;
 588
 589                 lbpc = level * 0xfe / panel->backlight.max + 1;
 590                 level /= lbpc;
 591                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 592         }
 593
 594         if (IS_GEN4(dev)) {
 595                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 596         } else {
 597                 level <<= 1;
 598                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 599         }
 600
 601         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 602         I915_WRITE(BLC_PWM_CTL, tmp | level);
 603 }
 604
 605 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 606 {
 607         struct drm_device *dev = connector->base.dev;
 608         struct drm_i915_private *dev_priv = dev->dev_private;
 609         enum pipe pipe = intel_get_pipe_from_connector(connector);
 610         u32 tmp;
 611
 612         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 613                 return;
 614
 615         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 616         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 617 }
 618
 619 static void
 620 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 621 {
 622         struct drm_device *dev = connector->base.dev;
 623         struct drm_i915_private *dev_priv = dev->dev_private;
 624
 625         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 626
 627         level = intel_panel_compute_brightness(connector, level);
 628         dev_priv->display.set_backlight(connector, level);
 629 }
 630
 631 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 632 static void intel_panel_set_backlight(struct intel_connector *connector,
 633                                       u32 user_level, u32 user_max)
 634 {
 635         struct drm_device *dev = connector->base.dev;
 636         struct drm_i915_private *dev_priv = dev->dev_private;
 637         struct intel_panel *panel = &connector->panel;
 638         u32 hw_level;
 639
 640         if (!panel->backlight.present)
 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         /*
 669          * INVALID_PIPE may occur during driver init because
 670          * connection_mutex isn't held across the entire backlight
 671          * setup + modeset readout, and the BIOS can issue the
 672          * requests at any time.
 673          */
 674         if (!panel->backlight.present || pipe == INVALID_PIPE)
 675                 return;
 676
 677         mutex_lock(&dev_priv->backlight_lock);
 678
 679         WARN_ON(panel->backlight.max == 0);
 680
 681         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 682         panel->backlight.level = hw_level;
 683
 684         if (panel->backlight.device)
 685                 panel->backlight.device->props.brightness =
 686                         scale_hw_to_user(connector,
 687                                          panel->backlight.level,
 688                                          panel->backlight.device->props.max_brightness);
 689
 690         if (panel->backlight.enabled)
 691                 intel_panel_actually_set_backlight(connector, hw_level);
 692
 693         mutex_unlock(&dev_priv->backlight_lock);
 694 }
 695
 696 static void pch_disable_backlight(struct intel_connector *connector)
 697 {
 698         struct drm_device *dev = connector->base.dev;
 699         struct drm_i915_private *dev_priv = dev->dev_private;
 700         u32 tmp;
 701
 702         intel_panel_actually_set_backlight(connector, 0);
 703
 704         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 705         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 706
 707         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 708         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 709 }
 710
 711 static void i9xx_disable_backlight(struct intel_connector *connector)
 712 {
 713         intel_panel_actually_set_backlight(connector, 0);
 714 }
 715
 716 static void i965_disable_backlight(struct intel_connector *connector)
 717 {
 718         struct drm_device *dev = connector->base.dev;
 719         struct drm_i915_private *dev_priv = dev->dev_private;
 720         u32 tmp;
 721
 722         intel_panel_actually_set_backlight(connector, 0);
 723
 724         tmp = I915_READ(BLC_PWM_CTL2);
 725         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 726 }
 727
 728 static void vlv_disable_backlight(struct intel_connector *connector)
 729 {
 730         struct drm_device *dev = connector->base.dev;
 731         struct drm_i915_private *dev_priv = dev->dev_private;
 732         enum pipe pipe = intel_get_pipe_from_connector(connector);
 733         u32 tmp;
 734
 735         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 736                 return;
 737
 738         intel_panel_actually_set_backlight(connector, 0);
 739
 740         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 741         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 742 }
 743
 744 void intel_panel_disable_backlight(struct intel_connector *connector)
 745 {
 746         struct drm_device *dev = connector->base.dev;
 747         struct drm_i915_private *dev_priv = dev->dev_private;
 748         struct intel_panel *panel = &connector->panel;
 749
 750         if (!panel->backlight.present)
 751                 return;
 752
 753         /*
 754          * Do not disable backlight on the vgaswitcheroo path. When switching
 755          * away from i915, the other client may depend on i915 to handle the
 756          * backlight. This will leave the backlight on unnecessarily when
 757          * another client is not activated.
 758          */
 759         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 760                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 761                 return;
 762         }
 763
 764         mutex_lock(&dev_priv->backlight_lock);
 765
 766         if (panel->backlight.device)
 767                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 768         panel->backlight.enabled = false;
 769         dev_priv->display.disable_backlight(connector);
 770
 771         mutex_unlock(&dev_priv->backlight_lock);
 772 }
 773
 774 static void bdw_enable_backlight(struct intel_connector *connector)
 775 {
 776         struct drm_device *dev = connector->base.dev;
 777         struct drm_i915_private *dev_priv = dev->dev_private;
 778         struct intel_panel *panel = &connector->panel;
 779         u32 pch_ctl1, pch_ctl2;
 780
 781         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 782         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 783                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 784                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 785                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 786         }
 787
 788         pch_ctl2 = panel->backlight.max << 16;
 789         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 790
 791         pch_ctl1 = 0;
 792         if (panel->backlight.active_low_pwm)
 793                 pch_ctl1 |= BLM_PCH_POLARITY;
 794
 795         /* After LPT, override is the default. */
 796         if (HAS_PCH_LPT(dev_priv))
 797                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 798
 799         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 800         POSTING_READ(BLC_PWM_PCH_CTL1);
 801         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 802
 803         /* This won't stick until the above enable. */
 804         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 805 }
 806
 807 static void pch_enable_backlight(struct intel_connector *connector)
 808 {
 809         struct drm_device *dev = connector->base.dev;
 810         struct drm_i915_private *dev_priv = dev->dev_private;
 811         struct intel_panel *panel = &connector->panel;
 812         enum pipe pipe = intel_get_pipe_from_connector(connector);
 813         enum transcoder cpu_transcoder =
 814                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 815         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 816
 817         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 818         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 819                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 820                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 821                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 822         }
 823
 824         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 825         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 826                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 827                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 828                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 829         }
 830
 831         if (cpu_transcoder == TRANSCODER_EDP)
 832                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 833         else
 834                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 835         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 836         POSTING_READ(BLC_PWM_CPU_CTL2);
 837         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 838
 839         /* This won't stick until the above enable. */
 840         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 841
 842         pch_ctl2 = panel->backlight.max << 16;
 843         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 844
 845         pch_ctl1 = 0;
 846         if (panel->backlight.active_low_pwm)
 847                 pch_ctl1 |= BLM_PCH_POLARITY;
 848
 849         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 850         POSTING_READ(BLC_PWM_PCH_CTL1);
 851         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 852 }
 853
 854 static void i9xx_enable_backlight(struct intel_connector *connector)
 855 {
 856         struct drm_device *dev = connector->base.dev;
 857         struct drm_i915_private *dev_priv = dev->dev_private;
 858         struct intel_panel *panel = &connector->panel;
 859         u32 ctl, freq;
 860
 861         ctl = I915_READ(BLC_PWM_CTL);
 862         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 863                 DRM_DEBUG_KMS("backlight already enabled\n");
 864                 I915_WRITE(BLC_PWM_CTL, 0);
 865         }
 866
 867         freq = panel->backlight.max;
 868         if (panel->backlight.combination_mode)
 869                 freq /= 0xff;
 870
 871         ctl = freq << 17;
 872         if (panel->backlight.combination_mode)
 873                 ctl |= BLM_LEGACY_MODE;
 874         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 875                 ctl |= BLM_POLARITY_PNV;
 876
 877         I915_WRITE(BLC_PWM_CTL, ctl);
 878         POSTING_READ(BLC_PWM_CTL);
 879
 880         /* XXX: combine this into above write? */
 881         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 882
 883         /*
 884          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 885          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 886          * that has backlight.
 887          */
 888         if (IS_GEN2(dev))
 889                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 890 }
 891
 892 static void i965_enable_backlight(struct intel_connector *connector)
 893 {
 894         struct drm_device *dev = connector->base.dev;
 895         struct drm_i915_private *dev_priv = dev->dev_private;
 896         struct intel_panel *panel = &connector->panel;
 897         enum pipe pipe = intel_get_pipe_from_connector(connector);
 898         u32 ctl, ctl2, freq;
 899
 900         ctl2 = I915_READ(BLC_PWM_CTL2);
 901         if (ctl2 & BLM_PWM_ENABLE) {
 902                 DRM_DEBUG_KMS("backlight already enabled\n");
 903                 ctl2 &= ~BLM_PWM_ENABLE;
 904                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 905         }
 906
 907         freq = panel->backlight.max;
 908         if (panel->backlight.combination_mode)
 909                 freq /= 0xff;
 910
 911         ctl = freq << 16;
 912         I915_WRITE(BLC_PWM_CTL, ctl);
 913
 914         ctl2 = BLM_PIPE(pipe);
 915         if (panel->backlight.combination_mode)
 916                 ctl2 |= BLM_COMBINATION_MODE;
 917         if (panel->backlight.active_low_pwm)
 918                 ctl2 |= BLM_POLARITY_I965;
 919         I915_WRITE(BLC_PWM_CTL2, ctl2);
 920         POSTING_READ(BLC_PWM_CTL2);
 921         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 922
 923         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 924 }
 925
 926 static void vlv_enable_backlight(struct intel_connector *connector)
 927 {
 928         struct drm_device *dev = connector->base.dev;
 929         struct drm_i915_private *dev_priv = dev->dev_private;
 930         struct intel_panel *panel = &connector->panel;
 931         enum pipe pipe = intel_get_pipe_from_connector(connector);
 932         u32 ctl, ctl2;
 933
 934         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 935                 return;
 936
 937         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 938         if (ctl2 & BLM_PWM_ENABLE) {
 939                 DRM_DEBUG_KMS("backlight already enabled\n");
 940                 ctl2 &= ~BLM_PWM_ENABLE;
 941                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 942         }
 943
 944         ctl = panel->backlight.max << 16;
 945         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 946
 947         /* XXX: combine this into above write? */
 948         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 949
 950         ctl2 = 0;
 951         if (panel->backlight.active_low_pwm)
 952                 ctl2 |= BLM_POLARITY_I965;
 953         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 954         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 955         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 956 }
 957
 958 void intel_panel_enable_backlight(struct intel_connector *connector)
 959 {
 960         struct drm_device *dev = connector->base.dev;
 961         struct drm_i915_private *dev_priv = dev->dev_private;
 962         struct intel_panel *panel = &connector->panel;
 963         enum pipe pipe = intel_get_pipe_from_connector(connector);
 964
 965         if (!panel->backlight.present)
 966                 return;
 967
 968         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 969
 970         mutex_lock(&dev_priv->backlight_lock);
 971
 972         WARN_ON(panel->backlight.max == 0);
 973
 974         if (panel->backlight.level <= panel->backlight.min) {
 975                 panel->backlight.level = panel->backlight.max;
 976                 if (panel->backlight.device)
 977                         panel->backlight.device->props.brightness =
 978                                 scale_hw_to_user(connector,
 979                                                  panel->backlight.level,
 980                                                  panel->backlight.device->props.max_brightness);
 981         }
 982
 983         dev_priv->display.enable_backlight(connector);
 984         panel->backlight.enabled = true;
 985         if (panel->backlight.device)
 986                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
 987
 988         mutex_unlock(&dev_priv->backlight_lock);
 989 }
 990
 991 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 992 static int intel_backlight_device_update_status(struct backlight_device *bd)
 993 {
 994         struct intel_connector *connector = bl_get_data(bd);
 995         struct intel_panel *panel = &connector->panel;
 996         struct drm_device *dev = connector->base.dev;
 997
 998         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 999         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1000                       bd->props.brightness, bd->props.max_brightness);
1001         intel_panel_set_backlight(connector, bd->props.brightness,
1002                                   bd->props.max_brightness);
1003
1004         /*
1005          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1006          * backlight class device does not make it easy to to differentiate
1007          * between callbacks for brightness and bl_power, so our backlight_power
1008          * callback needs to take this into account.
1009          */
1010         if (panel->backlight.enabled) {
1011                 if (panel->backlight_power) {
1012                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1013                                 bd->props.brightness != 0;
1014                         panel->backlight_power(connector, enable);
1015                 }
1016         } else {
1017                 bd->props.power = FB_BLANK_POWERDOWN;
1018         }
1019
1020         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1021         return 0;
1022 }
1023
1024 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1025 {
1026         struct intel_connector *connector = bl_get_data(bd);
1027         struct drm_device *dev = connector->base.dev;
1028         struct drm_i915_private *dev_priv = dev->dev_private;
1029         u32 hw_level;
1030         int ret;
1031
1032         intel_runtime_pm_get(dev_priv);
1033         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1034
1035         hw_level = intel_panel_get_backlight(connector);
1036         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1037
1038         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1039         intel_runtime_pm_put(dev_priv);
1040
1041         return ret;
1042 }
1043
1044 static const struct backlight_ops intel_backlight_device_ops = {
1045         .update_status = intel_backlight_device_update_status,
1046         .get_brightness = intel_backlight_device_get_brightness,
1047 };
1048
1049 static int intel_backlight_device_register(struct intel_connector *connector)
1050 {
1051         struct intel_panel *panel = &connector->panel;
1052         struct backlight_properties props;
1053
1054         if (WARN_ON(panel->backlight.device))
1055                 return -ENODEV;
1056
1057         if (!panel->backlight.present)
1058                 return 0;
1059
1060         WARN_ON(panel->backlight.max == 0);
1061
1062         memset(&props, 0, sizeof(props));
1063         props.type = BACKLIGHT_RAW;
1064
1065         /*
1066          * Note: Everything should work even if the backlight device max
1067          * presented to the userspace is arbitrarily chosen.
1068          */
1069         props.max_brightness = panel->backlight.max;
1070         props.brightness = scale_hw_to_user(connector,
1071                                             panel->backlight.level,
1072                                             props.max_brightness);
1073
1074         if (panel->backlight.enabled)
1075                 props.power = FB_BLANK_UNBLANK;
1076         else
1077                 props.power = FB_BLANK_POWERDOWN;
1078
1079         /*
1080          * Note: using the same name independent of the connector prevents
1081          * registration of multiple backlight devices in the driver.
1082          */
1083         panel->backlight.device =
1084                 backlight_device_register("intel_backlight",
1085                                           connector->base.kdev,
1086                                           connector,
1087                                           &intel_backlight_device_ops, &props);
1088
1089         if (IS_ERR(panel->backlight.device)) {
1090                 DRM_ERROR("Failed to register backlight: %ld\n",
1091                           PTR_ERR(panel->backlight.device));
1092                 panel->backlight.device = NULL;
1093                 return -ENODEV;
1094         }
1095
1096         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1097                       connector->base.name);
1098
1099         return 0;
1100 }
1101
1102 static void intel_backlight_device_unregister(struct intel_connector *connector)
1103 {
1104         struct intel_panel *panel = &connector->panel;
1105
1106         if (panel->backlight.device) {
1107                 backlight_device_unregister(panel->backlight.device);
1108                 panel->backlight.device = NULL;
1109         }
1110 }
1111 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1112 static int intel_backlight_device_register(struct intel_connector *connector)
1113 {
1114         return 0;
1115 }
1116 static void intel_backlight_device_unregister(struct intel_connector *connector)
1117 {
1118 }
1119 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1120
1121 /*
1122  * Note: The setup hooks can't assume pipe is set!
1123  *
1124  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1125  * appropriately when it's 0. Use VBT and/or sane defaults.
1126  */
1127 static u32 get_backlight_min_vbt(struct intel_connector *connector)
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         int min;
1133
1134         WARN_ON(panel->backlight.max == 0);
1135
1136         /*
1137          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1138          * to problems. There are such machines out there. Either our
1139          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1140          * against this by letting the minimum be at most (arbitrarily chosen)
1141          * 25% of the max.
1142          */
1143         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1144         if (min != dev_priv->vbt.backlight.min_brightness) {
1145                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1146                               dev_priv->vbt.backlight.min_brightness, min);
1147         }
1148
1149         /* vbt value is a coefficient in range [0..255] */
1150         return scale(min, 0, 255, 0, panel->backlight.max);
1151 }
1152
1153 static int bdw_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 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 = bdw_get_backlight(connector);
1171         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1172
1173         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1174                 panel->backlight.level != 0;
1175
1176         return 0;
1177 }
1178
1179 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1180 {
1181         struct drm_device *dev = connector->base.dev;
1182         struct drm_i915_private *dev_priv = dev->dev_private;
1183         struct intel_panel *panel = &connector->panel;
1184         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1185
1186         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1187         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1188
1189         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1190         panel->backlight.max = pch_ctl2 >> 16;
1191         if (!panel->backlight.max)
1192                 return -ENODEV;
1193
1194         panel->backlight.min = get_backlight_min_vbt(connector);
1195
1196         val = pch_get_backlight(connector);
1197         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1198
1199         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1200         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1201                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1202
1203         return 0;
1204 }
1205
1206 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1207 {
1208         struct drm_device *dev = connector->base.dev;
1209         struct drm_i915_private *dev_priv = dev->dev_private;
1210         struct intel_panel *panel = &connector->panel;
1211         u32 ctl, val;
1212
1213         ctl = I915_READ(BLC_PWM_CTL);
1214
1215         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1216                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1217
1218         if (IS_PINEVIEW(dev))
1219                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1220
1221         panel->backlight.max = ctl >> 17;
1222         if (panel->backlight.combination_mode)
1223                 panel->backlight.max *= 0xff;
1224
1225         if (!panel->backlight.max)
1226                 return -ENODEV;
1227
1228         panel->backlight.min = get_backlight_min_vbt(connector);
1229
1230         val = i9xx_get_backlight(connector);
1231         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1232
1233         panel->backlight.enabled = panel->backlight.level != 0;
1234
1235         return 0;
1236 }
1237
1238 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1239 {
1240         struct drm_device *dev = connector->base.dev;
1241         struct drm_i915_private *dev_priv = dev->dev_private;
1242         struct intel_panel *panel = &connector->panel;
1243         u32 ctl, ctl2, val;
1244
1245         ctl2 = I915_READ(BLC_PWM_CTL2);
1246         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1247         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1248
1249         ctl = I915_READ(BLC_PWM_CTL);
1250         panel->backlight.max = ctl >> 16;
1251         if (panel->backlight.combination_mode)
1252                 panel->backlight.max *= 0xff;
1253
1254         if (!panel->backlight.max)
1255                 return -ENODEV;
1256
1257         panel->backlight.min = get_backlight_min_vbt(connector);
1258
1259         val = i9xx_get_backlight(connector);
1260         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1261
1262         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1263                 panel->backlight.level != 0;
1264
1265         return 0;
1266 }
1267
1268 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1269 {
1270         struct drm_device *dev = connector->base.dev;
1271         struct drm_i915_private *dev_priv = dev->dev_private;
1272         struct intel_panel *panel = &connector->panel;
1273         enum pipe p;
1274         u32 ctl, ctl2, val;
1275
1276         for_each_pipe(dev_priv, p) {
1277                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1278
1279                 /* Skip if the modulation freq is already set */
1280                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1281                         continue;
1282
1283                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1284                 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1285                            cur_val);
1286         }
1287
1288         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1289                 return -ENODEV;
1290
1291         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1292         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1293
1294         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1295         panel->backlight.max = ctl >> 16;
1296         if (!panel->backlight.max)
1297                 return -ENODEV;
1298
1299         panel->backlight.min = get_backlight_min_vbt(connector);
1300
1301         val = _vlv_get_backlight(dev, pipe);
1302         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1303
1304         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1305                 panel->backlight.level != 0;
1306
1307         return 0;
1308 }
1309
1310 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1311 {
1312         struct drm_device *dev = connector->dev;
1313         struct drm_i915_private *dev_priv = dev->dev_private;
1314         struct intel_connector *intel_connector = to_intel_connector(connector);
1315         struct intel_panel *panel = &intel_connector->panel;
1316         int ret;
1317
1318         if (!dev_priv->vbt.backlight.present) {
1319                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1320                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1321                 } else {
1322                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1323                         return 0;
1324                 }
1325         }
1326
1327         /* set level and max in panel struct */
1328         mutex_lock(&dev_priv->backlight_lock);
1329         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1330         mutex_unlock(&dev_priv->backlight_lock);
1331
1332         if (ret) {
1333                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1334                               connector->name);
1335                 return ret;
1336         }
1337
1338         panel->backlight.present = true;
1339
1340         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1341                       connector->name,
1342                       panel->backlight.enabled ? "enabled" : "disabled",
1343                       panel->backlight.level, panel->backlight.max);
1344
1345         return 0;
1346 }
1347
1348 void intel_panel_destroy_backlight(struct drm_connector *connector)
1349 {
1350         struct intel_connector *intel_connector = to_intel_connector(connector);
1351         struct intel_panel *panel = &intel_connector->panel;
1352
1353         panel->backlight.present = false;
1354 }
1355
1356 /* Set up chip specific backlight functions */
1357 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1358 {
1359         struct drm_i915_private *dev_priv = dev->dev_private;
1360
1361         if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) {
1362                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1363                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1364                 dev_priv->display.disable_backlight = pch_disable_backlight;
1365                 dev_priv->display.set_backlight = bdw_set_backlight;
1366                 dev_priv->display.get_backlight = bdw_get_backlight;
1367         } else if (HAS_PCH_SPLIT(dev)) {
1368                 dev_priv->display.setup_backlight = pch_setup_backlight;
1369                 dev_priv->display.enable_backlight = pch_enable_backlight;
1370                 dev_priv->display.disable_backlight = pch_disable_backlight;
1371                 dev_priv->display.set_backlight = pch_set_backlight;
1372                 dev_priv->display.get_backlight = pch_get_backlight;
1373         } else if (IS_VALLEYVIEW(dev)) {
1374                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1375                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1376                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1377                 dev_priv->display.set_backlight = vlv_set_backlight;
1378                 dev_priv->display.get_backlight = vlv_get_backlight;
1379         } else if (IS_GEN4(dev)) {
1380                 dev_priv->display.setup_backlight = i965_setup_backlight;
1381                 dev_priv->display.enable_backlight = i965_enable_backlight;
1382                 dev_priv->display.disable_backlight = i965_disable_backlight;
1383                 dev_priv->display.set_backlight = i9xx_set_backlight;
1384                 dev_priv->display.get_backlight = i9xx_get_backlight;
1385         } else {
1386                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1387                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1388                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1389                 dev_priv->display.set_backlight = i9xx_set_backlight;
1390                 dev_priv->display.get_backlight = i9xx_get_backlight;
1391         }
1392 }
1393
1394 int intel_panel_init(struct intel_panel *panel,
1395                      struct drm_display_mode *fixed_mode,
1396                      struct drm_display_mode *downclock_mode)
1397 {
1398         panel->fixed_mode = fixed_mode;
1399         panel->downclock_mode = downclock_mode;
1400
1401         return 0;
1402 }
1403
1404 void intel_panel_fini(struct intel_panel *panel)
1405 {
1406         struct intel_connector *intel_connector =
1407                 container_of(panel, struct intel_connector, panel);
1408
1409         if (panel->fixed_mode)
1410                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1411
1412         if (panel->downclock_mode)
1413                 drm_mode_destroy(intel_connector->base.dev,
1414                                 panel->downclock_mode);
1415 }
1416
1417 void intel_backlight_register(struct drm_device *dev)
1418 {
1419         struct intel_connector *connector;
1420
1421         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1422                 intel_backlight_device_register(connector);
1423 }
1424
1425 void intel_backlight_unregister(struct drm_device *dev)
1426 {
1427         struct intel_connector *connector;
1428
1429         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1430                 intel_backlight_device_unregister(connector);
1431 }