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         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 525 }
 526
 527 static u32 vlv_get_backlight(struct intel_connector *connector)
 528 {
 529         struct drm_device *dev = connector->base.dev;
 530         enum pipe pipe = intel_get_pipe_from_connector(connector);
 531
 532         return _vlv_get_backlight(dev, pipe);
 533 }
 534
 535 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 536 {
 537         struct drm_device *dev = connector->base.dev;
 538         struct drm_i915_private *dev_priv = dev->dev_private;
 539         u32 val;
 540         unsigned long flags;
 541
 542         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 543
 544         val = dev_priv->display.get_backlight(connector);
 545         val = intel_panel_compute_brightness(connector, val);
 546
 547         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 548
 549         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 550         return val;
 551 }
 552
 553 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 554 {
 555         struct drm_device *dev = connector->base.dev;
 556         struct drm_i915_private *dev_priv = dev->dev_private;
 557         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 558         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 559 }
 560
 561 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 562 {
 563         struct drm_device *dev = connector->base.dev;
 564         struct drm_i915_private *dev_priv = dev->dev_private;
 565         u32 tmp;
 566
 567         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 568         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 569 }
 570
 571 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 572 {
 573         struct drm_device *dev = connector->base.dev;
 574         struct drm_i915_private *dev_priv = dev->dev_private;
 575         struct intel_panel *panel = &connector->panel;
 576         u32 tmp, mask;
 577
 578         WARN_ON(panel->backlight.max == 0);
 579
 580         if (panel->backlight.combination_mode) {
 581                 u8 lbpc;
 582
 583                 lbpc = level * 0xfe / panel->backlight.max + 1;
 584                 level /= lbpc;
 585                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 586         }
 587
 588         if (IS_GEN4(dev)) {
 589                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 590         } else {
 591                 level <<= 1;
 592                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 593         }
 594
 595         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 596         I915_WRITE(BLC_PWM_CTL, tmp | level);
 597 }
 598
 599 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 600 {
 601         struct drm_device *dev = connector->base.dev;
 602         struct drm_i915_private *dev_priv = dev->dev_private;
 603         enum pipe pipe = intel_get_pipe_from_connector(connector);
 604         u32 tmp;
 605
 606         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 607         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 608 }
 609
 610 static void
 611 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 612 {
 613         struct drm_device *dev = connector->base.dev;
 614         struct drm_i915_private *dev_priv = dev->dev_private;
 615
 616         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 617
 618         level = intel_panel_compute_brightness(connector, level);
 619         dev_priv->display.set_backlight(connector, level);
 620 }
 621
 622 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 623 static void intel_panel_set_backlight(struct intel_connector *connector,
 624                                       u32 user_level, u32 user_max)
 625 {
 626         struct drm_device *dev = connector->base.dev;
 627         struct drm_i915_private *dev_priv = dev->dev_private;
 628         struct intel_panel *panel = &connector->panel;
 629         enum pipe pipe = intel_get_pipe_from_connector(connector);
 630         u32 hw_level;
 631         unsigned long flags;
 632
 633         if (!panel->backlight.present || pipe == INVALID_PIPE)
 634                 return;
 635
 636         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 637
 638         WARN_ON(panel->backlight.max == 0);
 639
 640         hw_level = scale_user_to_hw(connector, user_level, user_max);
 641         panel->backlight.level = hw_level;
 642
 643         if (panel->backlight.enabled)
 644                 intel_panel_actually_set_backlight(connector, hw_level);
 645
 646         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 647 }
 648
 649 /* set backlight brightness to level in range [0..max], assuming hw min is
 650  * respected.
 651  */
 652 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 653                                     u32 user_level, u32 user_max)
 654 {
 655         struct drm_device *dev = connector->base.dev;
 656         struct drm_i915_private *dev_priv = dev->dev_private;
 657         struct intel_panel *panel = &connector->panel;
 658         enum pipe pipe = intel_get_pipe_from_connector(connector);
 659         u32 hw_level;
 660         unsigned long flags;
 661
 662         if (!panel->backlight.present || pipe == INVALID_PIPE)
 663                 return;
 664
 665         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 666
 667         WARN_ON(panel->backlight.max == 0);
 668
 669         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 670         panel->backlight.level = hw_level;
 671
 672         if (panel->backlight.device)
 673                 panel->backlight.device->props.brightness =
 674                         scale_hw_to_user(connector,
 675                                          panel->backlight.level,
 676                                          panel->backlight.device->props.max_brightness);
 677
 678         if (panel->backlight.enabled)
 679                 intel_panel_actually_set_backlight(connector, hw_level);
 680
 681         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 682 }
 683
 684 static void pch_disable_backlight(struct intel_connector *connector)
 685 {
 686         struct drm_device *dev = connector->base.dev;
 687         struct drm_i915_private *dev_priv = dev->dev_private;
 688         u32 tmp;
 689
 690         intel_panel_actually_set_backlight(connector, 0);
 691
 692         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 693         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 694
 695         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 696         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 697 }
 698
 699 static void i9xx_disable_backlight(struct intel_connector *connector)
 700 {
 701         intel_panel_actually_set_backlight(connector, 0);
 702 }
 703
 704 static void i965_disable_backlight(struct intel_connector *connector)
 705 {
 706         struct drm_device *dev = connector->base.dev;
 707         struct drm_i915_private *dev_priv = dev->dev_private;
 708         u32 tmp;
 709
 710         intel_panel_actually_set_backlight(connector, 0);
 711
 712         tmp = I915_READ(BLC_PWM_CTL2);
 713         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 714 }
 715
 716 static void vlv_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         enum pipe pipe = intel_get_pipe_from_connector(connector);
 721         u32 tmp;
 722
 723         intel_panel_actually_set_backlight(connector, 0);
 724
 725         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 726         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 727 }
 728
 729 void intel_panel_disable_backlight(struct intel_connector *connector)
 730 {
 731         struct drm_device *dev = connector->base.dev;
 732         struct drm_i915_private *dev_priv = dev->dev_private;
 733         struct intel_panel *panel = &connector->panel;
 734         enum pipe pipe = intel_get_pipe_from_connector(connector);
 735         unsigned long flags;
 736
 737         if (!panel->backlight.present || pipe == INVALID_PIPE)
 738                 return;
 739
 740         /*
 741          * Do not disable backlight on the vgaswitcheroo path. When switching
 742          * away from i915, the other client may depend on i915 to handle the
 743          * backlight. This will leave the backlight on unnecessarily when
 744          * another client is not activated.
 745          */
 746         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 747                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 748                 return;
 749         }
 750
 751         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 752
 753         if (panel->backlight.device)
 754                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 755         panel->backlight.enabled = false;
 756         dev_priv->display.disable_backlight(connector);
 757
 758         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 759 }
 760
 761 static void bdw_enable_backlight(struct intel_connector *connector)
 762 {
 763         struct drm_device *dev = connector->base.dev;
 764         struct drm_i915_private *dev_priv = dev->dev_private;
 765         struct intel_panel *panel = &connector->panel;
 766         u32 pch_ctl1, pch_ctl2;
 767
 768         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 769         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 770                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 771                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 772                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 773         }
 774
 775         pch_ctl2 = panel->backlight.max << 16;
 776         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 777
 778         pch_ctl1 = 0;
 779         if (panel->backlight.active_low_pwm)
 780                 pch_ctl1 |= BLM_PCH_POLARITY;
 781
 782         /* BDW always uses the pch pwm controls. */
 783         pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 784
 785         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 786         POSTING_READ(BLC_PWM_PCH_CTL1);
 787         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 788
 789         /* This won't stick until the above enable. */
 790         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 791 }
 792
 793 static void pch_enable_backlight(struct intel_connector *connector)
 794 {
 795         struct drm_device *dev = connector->base.dev;
 796         struct drm_i915_private *dev_priv = dev->dev_private;
 797         struct intel_panel *panel = &connector->panel;
 798         enum pipe pipe = intel_get_pipe_from_connector(connector);
 799         enum transcoder cpu_transcoder =
 800                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 801         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 802
 803         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 804         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 805                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 806                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 807                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 808         }
 809
 810         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 811         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 812                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 813                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 814                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 815         }
 816
 817         if (cpu_transcoder == TRANSCODER_EDP)
 818                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 819         else
 820                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 821         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 822         POSTING_READ(BLC_PWM_CPU_CTL2);
 823         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 824
 825         /* This won't stick until the above enable. */
 826         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 827
 828         pch_ctl2 = panel->backlight.max << 16;
 829         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 830
 831         pch_ctl1 = 0;
 832         if (panel->backlight.active_low_pwm)
 833                 pch_ctl1 |= BLM_PCH_POLARITY;
 834
 835         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 836         POSTING_READ(BLC_PWM_PCH_CTL1);
 837         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 838 }
 839
 840 static void i9xx_enable_backlight(struct intel_connector *connector)
 841 {
 842         struct drm_device *dev = connector->base.dev;
 843         struct drm_i915_private *dev_priv = dev->dev_private;
 844         struct intel_panel *panel = &connector->panel;
 845         u32 ctl, freq;
 846
 847         ctl = I915_READ(BLC_PWM_CTL);
 848         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 849                 DRM_DEBUG_KMS("backlight already enabled\n");
 850                 I915_WRITE(BLC_PWM_CTL, 0);
 851         }
 852
 853         freq = panel->backlight.max;
 854         if (panel->backlight.combination_mode)
 855                 freq /= 0xff;
 856
 857         ctl = freq << 17;
 858         if (panel->backlight.combination_mode)
 859                 ctl |= BLM_LEGACY_MODE;
 860         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 861                 ctl |= BLM_POLARITY_PNV;
 862
 863         I915_WRITE(BLC_PWM_CTL, ctl);
 864         POSTING_READ(BLC_PWM_CTL);
 865
 866         /* XXX: combine this into above write? */
 867         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 868 }
 869
 870 static void i965_enable_backlight(struct intel_connector *connector)
 871 {
 872         struct drm_device *dev = connector->base.dev;
 873         struct drm_i915_private *dev_priv = dev->dev_private;
 874         struct intel_panel *panel = &connector->panel;
 875         enum pipe pipe = intel_get_pipe_from_connector(connector);
 876         u32 ctl, ctl2, freq;
 877
 878         ctl2 = I915_READ(BLC_PWM_CTL2);
 879         if (ctl2 & BLM_PWM_ENABLE) {
 880                 DRM_DEBUG_KMS("backlight already enabled\n");
 881                 ctl2 &= ~BLM_PWM_ENABLE;
 882                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 883         }
 884
 885         freq = panel->backlight.max;
 886         if (panel->backlight.combination_mode)
 887                 freq /= 0xff;
 888
 889         ctl = freq << 16;
 890         I915_WRITE(BLC_PWM_CTL, ctl);
 891
 892         ctl2 = BLM_PIPE(pipe);
 893         if (panel->backlight.combination_mode)
 894                 ctl2 |= BLM_COMBINATION_MODE;
 895         if (panel->backlight.active_low_pwm)
 896                 ctl2 |= BLM_POLARITY_I965;
 897         I915_WRITE(BLC_PWM_CTL2, ctl2);
 898         POSTING_READ(BLC_PWM_CTL2);
 899         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 900
 901         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 902 }
 903
 904 static void vlv_enable_backlight(struct intel_connector *connector)
 905 {
 906         struct drm_device *dev = connector->base.dev;
 907         struct drm_i915_private *dev_priv = dev->dev_private;
 908         struct intel_panel *panel = &connector->panel;
 909         enum pipe pipe = intel_get_pipe_from_connector(connector);
 910         u32 ctl, ctl2;
 911
 912         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 913         if (ctl2 & BLM_PWM_ENABLE) {
 914                 DRM_DEBUG_KMS("backlight already enabled\n");
 915                 ctl2 &= ~BLM_PWM_ENABLE;
 916                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 917         }
 918
 919         ctl = panel->backlight.max << 16;
 920         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 921
 922         /* XXX: combine this into above write? */
 923         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 924
 925         ctl2 = 0;
 926         if (panel->backlight.active_low_pwm)
 927                 ctl2 |= BLM_POLARITY_I965;
 928         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 929         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 930         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 931 }
 932
 933 void intel_panel_enable_backlight(struct intel_connector *connector)
 934 {
 935         struct drm_device *dev = connector->base.dev;
 936         struct drm_i915_private *dev_priv = dev->dev_private;
 937         struct intel_panel *panel = &connector->panel;
 938         enum pipe pipe = intel_get_pipe_from_connector(connector);
 939         unsigned long flags;
 940
 941         if (!panel->backlight.present || pipe == INVALID_PIPE)
 942                 return;
 943
 944         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 945
 946         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 947
 948         WARN_ON(panel->backlight.max == 0);
 949
 950         if (panel->backlight.level == 0) {
 951                 panel->backlight.level = panel->backlight.max;
 952                 if (panel->backlight.device)
 953                         panel->backlight.device->props.brightness =
 954                                 scale_hw_to_user(connector,
 955                                                  panel->backlight.level,
 956                                                  panel->backlight.device->props.max_brightness);
 957         }
 958
 959         dev_priv->display.enable_backlight(connector);
 960         panel->backlight.enabled = true;
 961         if (panel->backlight.device)
 962                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
 963
 964         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 965 }
 966
 967 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 968 static int intel_backlight_device_update_status(struct backlight_device *bd)
 969 {
 970         struct intel_connector *connector = bl_get_data(bd);
 971         struct intel_panel *panel = &connector->panel;
 972         struct drm_device *dev = connector->base.dev;
 973
 974         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 975         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 976                       bd->props.brightness, bd->props.max_brightness);
 977         intel_panel_set_backlight(connector, bd->props.brightness,
 978                                   bd->props.max_brightness);
 979
 980         /*
 981          * Allow flipping bl_power as a sub-state of enabled. Sadly the
 982          * backlight class device does not make it easy to to differentiate
 983          * between callbacks for brightness and bl_power, so our backlight_power
 984          * callback needs to take this into account.
 985          */
 986         if (panel->backlight.enabled) {
 987                 if (panel->backlight_power) {
 988                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
 989                                 bd->props.brightness != 0;
 990                         panel->backlight_power(connector, enable);
 991                 }
 992         } else {
 993                 bd->props.power = FB_BLANK_POWERDOWN;
 994         }
 995
 996         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 997         return 0;
 998 }
 999
1000 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1001 {
1002         struct intel_connector *connector = bl_get_data(bd);
1003         struct drm_device *dev = connector->base.dev;
1004         struct drm_i915_private *dev_priv = dev->dev_private;
1005         u32 hw_level;
1006         int ret;
1007
1008         intel_runtime_pm_get(dev_priv);
1009         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1010
1011         hw_level = intel_panel_get_backlight(connector);
1012         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1013
1014         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1015         intel_runtime_pm_put(dev_priv);
1016
1017         return ret;
1018 }
1019
1020 static const struct backlight_ops intel_backlight_device_ops = {
1021         .update_status = intel_backlight_device_update_status,
1022         .get_brightness = intel_backlight_device_get_brightness,
1023 };
1024
1025 static int intel_backlight_device_register(struct intel_connector *connector)
1026 {
1027         struct intel_panel *panel = &connector->panel;
1028         struct backlight_properties props;
1029
1030         if (WARN_ON(panel->backlight.device))
1031                 return -ENODEV;
1032
1033         WARN_ON(panel->backlight.max == 0);
1034
1035         memset(&props, 0, sizeof(props));
1036         props.type = BACKLIGHT_RAW;
1037
1038         /*
1039          * Note: Everything should work even if the backlight device max
1040          * presented to the userspace is arbitrarily chosen.
1041          */
1042         props.max_brightness = panel->backlight.max;
1043         props.brightness = scale_hw_to_user(connector,
1044                                             panel->backlight.level,
1045                                             props.max_brightness);
1046
1047         if (panel->backlight.enabled)
1048                 props.power = FB_BLANK_UNBLANK;
1049         else
1050                 props.power = FB_BLANK_POWERDOWN;
1051
1052         /*
1053          * Note: using the same name independent of the connector prevents
1054          * registration of multiple backlight devices in the driver.
1055          */
1056         panel->backlight.device =
1057                 backlight_device_register("intel_backlight",
1058                                           connector->base.kdev,
1059                                           connector,
1060                                           &intel_backlight_device_ops, &props);
1061
1062         if (IS_ERR(panel->backlight.device)) {
1063                 DRM_ERROR("Failed to register backlight: %ld\n",
1064                           PTR_ERR(panel->backlight.device));
1065                 panel->backlight.device = NULL;
1066                 return -ENODEV;
1067         }
1068         return 0;
1069 }
1070
1071 static void intel_backlight_device_unregister(struct intel_connector *connector)
1072 {
1073         struct intel_panel *panel = &connector->panel;
1074
1075         if (panel->backlight.device) {
1076                 backlight_device_unregister(panel->backlight.device);
1077                 panel->backlight.device = NULL;
1078         }
1079 }
1080 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1081 static int intel_backlight_device_register(struct intel_connector *connector)
1082 {
1083         return 0;
1084 }
1085 static void intel_backlight_device_unregister(struct intel_connector *connector)
1086 {
1087 }
1088 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1089
1090 /*
1091  * Note: The setup hooks can't assume pipe is set!
1092  *
1093  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1094  * appropriately when it's 0. Use VBT and/or sane defaults.
1095  */
1096 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1097 {
1098         struct drm_device *dev = connector->base.dev;
1099         struct drm_i915_private *dev_priv = dev->dev_private;
1100         struct intel_panel *panel = &connector->panel;
1101         int min;
1102
1103         WARN_ON(panel->backlight.max == 0);
1104
1105         /*
1106          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1107          * to problems. There are such machines out there. Either our
1108          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1109          * against this by letting the minimum be at most (arbitrarily chosen)
1110          * 25% of the max.
1111          */
1112         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1113         if (min != dev_priv->vbt.backlight.min_brightness) {
1114                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1115                               dev_priv->vbt.backlight.min_brightness, min);
1116         }
1117
1118         /* vbt value is a coefficient in range [0..255] */
1119         return scale(min, 0, 255, 0, panel->backlight.max);
1120 }
1121
1122 static int bdw_setup_backlight(struct intel_connector *connector)
1123 {
1124         struct drm_device *dev = connector->base.dev;
1125         struct drm_i915_private *dev_priv = dev->dev_private;
1126         struct intel_panel *panel = &connector->panel;
1127         u32 pch_ctl1, pch_ctl2, val;
1128
1129         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1130         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1131
1132         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1133         panel->backlight.max = pch_ctl2 >> 16;
1134         if (!panel->backlight.max)
1135                 return -ENODEV;
1136
1137         panel->backlight.min = get_backlight_min_vbt(connector);
1138
1139         val = bdw_get_backlight(connector);
1140         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1141
1142         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1143                 panel->backlight.level != 0;
1144
1145         return 0;
1146 }
1147
1148 static int pch_setup_backlight(struct intel_connector *connector)
1149 {
1150         struct drm_device *dev = connector->base.dev;
1151         struct drm_i915_private *dev_priv = dev->dev_private;
1152         struct intel_panel *panel = &connector->panel;
1153         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1154
1155         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1156         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1157
1158         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1159         panel->backlight.max = pch_ctl2 >> 16;
1160         if (!panel->backlight.max)
1161                 return -ENODEV;
1162
1163         panel->backlight.min = get_backlight_min_vbt(connector);
1164
1165         val = pch_get_backlight(connector);
1166         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1167
1168         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1169         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1170                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1171
1172         return 0;
1173 }
1174
1175 static int i9xx_setup_backlight(struct intel_connector *connector)
1176 {
1177         struct drm_device *dev = connector->base.dev;
1178         struct drm_i915_private *dev_priv = dev->dev_private;
1179         struct intel_panel *panel = &connector->panel;
1180         u32 ctl, val;
1181
1182         ctl = I915_READ(BLC_PWM_CTL);
1183
1184         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1185                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1186
1187         if (IS_PINEVIEW(dev))
1188                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1189
1190         panel->backlight.max = ctl >> 17;
1191         if (panel->backlight.combination_mode)
1192                 panel->backlight.max *= 0xff;
1193
1194         if (!panel->backlight.max)
1195                 return -ENODEV;
1196
1197         panel->backlight.min = get_backlight_min_vbt(connector);
1198
1199         val = i9xx_get_backlight(connector);
1200         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1201
1202         panel->backlight.enabled = panel->backlight.level != 0;
1203
1204         return 0;
1205 }
1206
1207 static int i965_setup_backlight(struct intel_connector *connector)
1208 {
1209         struct drm_device *dev = connector->base.dev;
1210         struct drm_i915_private *dev_priv = dev->dev_private;
1211         struct intel_panel *panel = &connector->panel;
1212         u32 ctl, ctl2, val;
1213
1214         ctl2 = I915_READ(BLC_PWM_CTL2);
1215         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1216         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1217
1218         ctl = I915_READ(BLC_PWM_CTL);
1219         panel->backlight.max = ctl >> 16;
1220         if (panel->backlight.combination_mode)
1221                 panel->backlight.max *= 0xff;
1222
1223         if (!panel->backlight.max)
1224                 return -ENODEV;
1225
1226         panel->backlight.min = get_backlight_min_vbt(connector);
1227
1228         val = i9xx_get_backlight(connector);
1229         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1230
1231         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1232                 panel->backlight.level != 0;
1233
1234         return 0;
1235 }
1236
1237 static int vlv_setup_backlight(struct intel_connector *connector)
1238 {
1239         struct drm_device *dev = connector->base.dev;
1240         struct drm_i915_private *dev_priv = dev->dev_private;
1241         struct intel_panel *panel = &connector->panel;
1242         enum pipe pipe;
1243         u32 ctl, ctl2, val;
1244
1245         for_each_pipe(dev_priv, pipe) {
1246                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1247
1248                 /* Skip if the modulation freq is already set */
1249                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1250                         continue;
1251
1252                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1253                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1254                            cur_val);
1255         }
1256
1257         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
1258         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1259
1260         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
1261         panel->backlight.max = ctl >> 16;
1262         if (!panel->backlight.max)
1263                 return -ENODEV;
1264
1265         panel->backlight.min = get_backlight_min_vbt(connector);
1266
1267         val = _vlv_get_backlight(dev, PIPE_A);
1268         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1269
1270         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1271                 panel->backlight.level != 0;
1272
1273         return 0;
1274 }
1275
1276 int intel_panel_setup_backlight(struct drm_connector *connector)
1277 {
1278         struct drm_device *dev = connector->dev;
1279         struct drm_i915_private *dev_priv = dev->dev_private;
1280         struct intel_connector *intel_connector = to_intel_connector(connector);
1281         struct intel_panel *panel = &intel_connector->panel;
1282         unsigned long flags;
1283         int ret;
1284
1285         if (!dev_priv->vbt.backlight.present) {
1286                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1287                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1288                 } else {
1289                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1290                         return 0;
1291                 }
1292         }
1293
1294         /* set level and max in panel struct */
1295         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
1296         ret = dev_priv->display.setup_backlight(intel_connector);
1297         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
1298
1299         if (ret) {
1300                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1301                               connector->name);
1302                 return ret;
1303         }
1304
1305         intel_backlight_device_register(intel_connector);
1306
1307         panel->backlight.present = true;
1308
1309         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1310                       "sysfs interface %sregistered\n",
1311                       panel->backlight.enabled ? "enabled" : "disabled",
1312                       panel->backlight.level, panel->backlight.max,
1313                       panel->backlight.device ? "" : "not ");
1314
1315         return 0;
1316 }
1317
1318 void intel_panel_destroy_backlight(struct drm_connector *connector)
1319 {
1320         struct intel_connector *intel_connector = to_intel_connector(connector);
1321         struct intel_panel *panel = &intel_connector->panel;
1322
1323         panel->backlight.present = false;
1324         intel_backlight_device_unregister(intel_connector);
1325 }
1326
1327 /* Set up chip specific backlight functions */
1328 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1329 {
1330         struct drm_i915_private *dev_priv = dev->dev_private;
1331
1332         if (IS_BROADWELL(dev)) {
1333                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1334                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1335                 dev_priv->display.disable_backlight = pch_disable_backlight;
1336                 dev_priv->display.set_backlight = bdw_set_backlight;
1337                 dev_priv->display.get_backlight = bdw_get_backlight;
1338         } else if (HAS_PCH_SPLIT(dev)) {
1339                 dev_priv->display.setup_backlight = pch_setup_backlight;
1340                 dev_priv->display.enable_backlight = pch_enable_backlight;
1341                 dev_priv->display.disable_backlight = pch_disable_backlight;
1342                 dev_priv->display.set_backlight = pch_set_backlight;
1343                 dev_priv->display.get_backlight = pch_get_backlight;
1344         } else if (IS_VALLEYVIEW(dev)) {
1345                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1346                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1347                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1348                 dev_priv->display.set_backlight = vlv_set_backlight;
1349                 dev_priv->display.get_backlight = vlv_get_backlight;
1350         } else if (IS_GEN4(dev)) {
1351                 dev_priv->display.setup_backlight = i965_setup_backlight;
1352                 dev_priv->display.enable_backlight = i965_enable_backlight;
1353                 dev_priv->display.disable_backlight = i965_disable_backlight;
1354                 dev_priv->display.set_backlight = i9xx_set_backlight;
1355                 dev_priv->display.get_backlight = i9xx_get_backlight;
1356         } else {
1357                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1358                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1359                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1360                 dev_priv->display.set_backlight = i9xx_set_backlight;
1361                 dev_priv->display.get_backlight = i9xx_get_backlight;
1362         }
1363 }
1364
1365 int intel_panel_init(struct intel_panel *panel,
1366                      struct drm_display_mode *fixed_mode,
1367                      struct drm_display_mode *downclock_mode)
1368 {
1369         panel->fixed_mode = fixed_mode;
1370         panel->downclock_mode = downclock_mode;
1371
1372         return 0;
1373 }
1374
1375 void intel_panel_fini(struct intel_panel *panel)
1376 {
1377         struct intel_connector *intel_connector =
1378                 container_of(panel, struct intel_connector, panel);
1379
1380         if (panel->fixed_mode)
1381                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1382
1383         if (panel->downclock_mode)
1384                 drm_mode_destroy(intel_connector->base.dev,
1385                                 panel->downclock_mode);
1386 }