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 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 402                                           u32 val)
 403 {
 404         struct drm_device *dev = connector->base.dev;
 405         struct drm_i915_private *dev_priv = dev->dev_private;
 406         struct intel_panel *panel = &connector->panel;
 407
 408         WARN_ON(panel->backlight.max == 0);
 409
 410         if (i915.invert_brightness < 0)
 411                 return val;
 412
 413         if (i915.invert_brightness > 0 ||
 414             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 415                 return panel->backlight.max - val;
 416         }
 417
 418         return val;
 419 }
 420
 421 static u32 bdw_get_backlight(struct intel_connector *connector)
 422 {
 423         struct drm_device *dev = connector->base.dev;
 424         struct drm_i915_private *dev_priv = dev->dev_private;
 425
 426         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 427 }
 428
 429 static u32 pch_get_backlight(struct intel_connector *connector)
 430 {
 431         struct drm_device *dev = connector->base.dev;
 432         struct drm_i915_private *dev_priv = dev->dev_private;
 433
 434         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 435 }
 436
 437 static u32 i9xx_get_backlight(struct intel_connector *connector)
 438 {
 439         struct drm_device *dev = connector->base.dev;
 440         struct drm_i915_private *dev_priv = dev->dev_private;
 441         struct intel_panel *panel = &connector->panel;
 442         u32 val;
 443
 444         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 445         if (INTEL_INFO(dev)->gen < 4)
 446                 val >>= 1;
 447
 448         if (panel->backlight.combination_mode) {
 449                 u8 lbpc;
 450
 451                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 452                 val *= lbpc;
 453         }
 454
 455         return val;
 456 }
 457
 458 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 459 {
 460         struct drm_i915_private *dev_priv = dev->dev_private;
 461
 462         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 463 }
 464
 465 static u32 vlv_get_backlight(struct intel_connector *connector)
 466 {
 467         struct drm_device *dev = connector->base.dev;
 468         enum pipe pipe = intel_get_pipe_from_connector(connector);
 469
 470         return _vlv_get_backlight(dev, pipe);
 471 }
 472
 473 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 474 {
 475         struct drm_device *dev = connector->base.dev;
 476         struct drm_i915_private *dev_priv = dev->dev_private;
 477         u32 val;
 478         unsigned long flags;
 479
 480         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 481
 482         val = dev_priv->display.get_backlight(connector);
 483         val = intel_panel_compute_brightness(connector, val);
 484
 485         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 486
 487         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 488         return val;
 489 }
 490
 491 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 492 {
 493         struct drm_device *dev = connector->base.dev;
 494         struct drm_i915_private *dev_priv = dev->dev_private;
 495         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 496         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 497 }
 498
 499 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 500 {
 501         struct drm_device *dev = connector->base.dev;
 502         struct drm_i915_private *dev_priv = dev->dev_private;
 503         u32 tmp;
 504
 505         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 506         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 507 }
 508
 509 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 510 {
 511         struct drm_device *dev = connector->base.dev;
 512         struct drm_i915_private *dev_priv = dev->dev_private;
 513         struct intel_panel *panel = &connector->panel;
 514         u32 tmp, mask;
 515
 516         WARN_ON(panel->backlight.max == 0);
 517
 518         if (panel->backlight.combination_mode) {
 519                 u8 lbpc;
 520
 521                 lbpc = level * 0xfe / panel->backlight.max + 1;
 522                 level /= lbpc;
 523                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 524         }
 525
 526         if (IS_GEN4(dev)) {
 527                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 528         } else {
 529                 level <<= 1;
 530                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 531         }
 532
 533         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 534         I915_WRITE(BLC_PWM_CTL, tmp | level);
 535 }
 536
 537 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 538 {
 539         struct drm_device *dev = connector->base.dev;
 540         struct drm_i915_private *dev_priv = dev->dev_private;
 541         enum pipe pipe = intel_get_pipe_from_connector(connector);
 542         u32 tmp;
 543
 544         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 545         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 546 }
 547
 548 static void
 549 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 550 {
 551         struct drm_device *dev = connector->base.dev;
 552         struct drm_i915_private *dev_priv = dev->dev_private;
 553
 554         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 555
 556         level = intel_panel_compute_brightness(connector, level);
 557         dev_priv->display.set_backlight(connector, level);
 558 }
 559
 560 /* set backlight brightness to level in range [0..max] */
 561 void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
 562                                u32 max)
 563 {
 564         struct drm_device *dev = connector->base.dev;
 565         struct drm_i915_private *dev_priv = dev->dev_private;
 566         struct intel_panel *panel = &connector->panel;
 567         enum pipe pipe = intel_get_pipe_from_connector(connector);
 568         u32 freq;
 569         unsigned long flags;
 570         u64 n;
 571
 572         if (!panel->backlight.present || pipe == INVALID_PIPE)
 573                 return;
 574
 575         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 576
 577         WARN_ON(panel->backlight.max == 0);
 578
 579         /* scale to hardware max, but be careful to not overflow */
 580         freq = panel->backlight.max;
 581         n = (u64)level * freq;
 582         do_div(n, max);
 583         level = n;
 584
 585         panel->backlight.level = level;
 586         if (panel->backlight.device)
 587                 panel->backlight.device->props.brightness = level;
 588
 589         if (panel->backlight.enabled)
 590                 intel_panel_actually_set_backlight(connector, level);
 591
 592         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 593 }
 594
 595 static void pch_disable_backlight(struct intel_connector *connector)
 596 {
 597         struct drm_device *dev = connector->base.dev;
 598         struct drm_i915_private *dev_priv = dev->dev_private;
 599         u32 tmp;
 600
 601         intel_panel_actually_set_backlight(connector, 0);
 602
 603         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 604         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 605
 606         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 607         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 608 }
 609
 610 static void i9xx_disable_backlight(struct intel_connector *connector)
 611 {
 612         intel_panel_actually_set_backlight(connector, 0);
 613 }
 614
 615 static void i965_disable_backlight(struct intel_connector *connector)
 616 {
 617         struct drm_device *dev = connector->base.dev;
 618         struct drm_i915_private *dev_priv = dev->dev_private;
 619         u32 tmp;
 620
 621         intel_panel_actually_set_backlight(connector, 0);
 622
 623         tmp = I915_READ(BLC_PWM_CTL2);
 624         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 625 }
 626
 627 static void vlv_disable_backlight(struct intel_connector *connector)
 628 {
 629         struct drm_device *dev = connector->base.dev;
 630         struct drm_i915_private *dev_priv = dev->dev_private;
 631         enum pipe pipe = intel_get_pipe_from_connector(connector);
 632         u32 tmp;
 633
 634         intel_panel_actually_set_backlight(connector, 0);
 635
 636         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 637         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 638 }
 639
 640 void intel_panel_disable_backlight(struct intel_connector *connector)
 641 {
 642         struct drm_device *dev = connector->base.dev;
 643         struct drm_i915_private *dev_priv = dev->dev_private;
 644         struct intel_panel *panel = &connector->panel;
 645         enum pipe pipe = intel_get_pipe_from_connector(connector);
 646         unsigned long flags;
 647
 648         if (!panel->backlight.present || pipe == INVALID_PIPE)
 649                 return;
 650
 651         /*
 652          * Do not disable backlight on the vgaswitcheroo path. When switching
 653          * away from i915, the other client may depend on i915 to handle the
 654          * backlight. This will leave the backlight on unnecessarily when
 655          * another client is not activated.
 656          */
 657         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 658                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 659                 return;
 660         }
 661
 662         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 663
 664         panel->backlight.enabled = false;
 665         dev_priv->display.disable_backlight(connector);
 666
 667         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 668 }
 669
 670 static void bdw_enable_backlight(struct intel_connector *connector)
 671 {
 672         struct drm_device *dev = connector->base.dev;
 673         struct drm_i915_private *dev_priv = dev->dev_private;
 674         struct intel_panel *panel = &connector->panel;
 675         u32 pch_ctl1, pch_ctl2;
 676
 677         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 678         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 679                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 680                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 681                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 682         }
 683
 684         pch_ctl2 = panel->backlight.max << 16;
 685         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 686
 687         pch_ctl1 = 0;
 688         if (panel->backlight.active_low_pwm)
 689                 pch_ctl1 |= BLM_PCH_POLARITY;
 690
 691         /* BDW always uses the pch pwm controls. */
 692         pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 693
 694         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 695         POSTING_READ(BLC_PWM_PCH_CTL1);
 696         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 697
 698         /* This won't stick until the above enable. */
 699         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 700 }
 701
 702 static void pch_enable_backlight(struct intel_connector *connector)
 703 {
 704         struct drm_device *dev = connector->base.dev;
 705         struct drm_i915_private *dev_priv = dev->dev_private;
 706         struct intel_panel *panel = &connector->panel;
 707         enum pipe pipe = intel_get_pipe_from_connector(connector);
 708         enum transcoder cpu_transcoder =
 709                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 710         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 711
 712         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 713         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 714                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 715                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 716                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 717         }
 718
 719         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 720         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 721                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 722                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 723                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 724         }
 725
 726         if (cpu_transcoder == TRANSCODER_EDP)
 727                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 728         else
 729                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 730         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 731         POSTING_READ(BLC_PWM_CPU_CTL2);
 732         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 733
 734         /* This won't stick until the above enable. */
 735         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 736
 737         pch_ctl2 = panel->backlight.max << 16;
 738         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 739
 740         pch_ctl1 = 0;
 741         if (panel->backlight.active_low_pwm)
 742                 pch_ctl1 |= BLM_PCH_POLARITY;
 743
 744         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 745         POSTING_READ(BLC_PWM_PCH_CTL1);
 746         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 747 }
 748
 749 static void i9xx_enable_backlight(struct intel_connector *connector)
 750 {
 751         struct drm_device *dev = connector->base.dev;
 752         struct drm_i915_private *dev_priv = dev->dev_private;
 753         struct intel_panel *panel = &connector->panel;
 754         u32 ctl, freq;
 755
 756         ctl = I915_READ(BLC_PWM_CTL);
 757         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 758                 DRM_DEBUG_KMS("backlight already enabled\n");
 759                 I915_WRITE(BLC_PWM_CTL, 0);
 760         }
 761
 762         freq = panel->backlight.max;
 763         if (panel->backlight.combination_mode)
 764                 freq /= 0xff;
 765
 766         ctl = freq << 17;
 767         if (panel->backlight.combination_mode)
 768                 ctl |= BLM_LEGACY_MODE;
 769         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 770                 ctl |= BLM_POLARITY_PNV;
 771
 772         I915_WRITE(BLC_PWM_CTL, ctl);
 773         POSTING_READ(BLC_PWM_CTL);
 774
 775         /* XXX: combine this into above write? */
 776         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 777
 778         /*
 779          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 780          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 781          * that has backlight.
 782          */
 783         if (IS_GEN2(dev))
 784                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 785 }
 786
 787 static void i965_enable_backlight(struct intel_connector *connector)
 788 {
 789         struct drm_device *dev = connector->base.dev;
 790         struct drm_i915_private *dev_priv = dev->dev_private;
 791         struct intel_panel *panel = &connector->panel;
 792         enum pipe pipe = intel_get_pipe_from_connector(connector);
 793         u32 ctl, ctl2, freq;
 794
 795         ctl2 = I915_READ(BLC_PWM_CTL2);
 796         if (ctl2 & BLM_PWM_ENABLE) {
 797                 DRM_DEBUG_KMS("backlight already enabled\n");
 798                 ctl2 &= ~BLM_PWM_ENABLE;
 799                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 800         }
 801
 802         freq = panel->backlight.max;
 803         if (panel->backlight.combination_mode)
 804                 freq /= 0xff;
 805
 806         ctl = freq << 16;
 807         I915_WRITE(BLC_PWM_CTL, ctl);
 808
 809         ctl2 = BLM_PIPE(pipe);
 810         if (panel->backlight.combination_mode)
 811                 ctl2 |= BLM_COMBINATION_MODE;
 812         if (panel->backlight.active_low_pwm)
 813                 ctl2 |= BLM_POLARITY_I965;
 814         I915_WRITE(BLC_PWM_CTL2, ctl2);
 815         POSTING_READ(BLC_PWM_CTL2);
 816         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 817
 818         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 819 }
 820
 821 static void vlv_enable_backlight(struct intel_connector *connector)
 822 {
 823         struct drm_device *dev = connector->base.dev;
 824         struct drm_i915_private *dev_priv = dev->dev_private;
 825         struct intel_panel *panel = &connector->panel;
 826         enum pipe pipe = intel_get_pipe_from_connector(connector);
 827         u32 ctl, ctl2;
 828
 829         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 830         if (ctl2 & BLM_PWM_ENABLE) {
 831                 DRM_DEBUG_KMS("backlight already enabled\n");
 832                 ctl2 &= ~BLM_PWM_ENABLE;
 833                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 834         }
 835
 836         ctl = panel->backlight.max << 16;
 837         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 838
 839         /* XXX: combine this into above write? */
 840         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 841
 842         ctl2 = 0;
 843         if (panel->backlight.active_low_pwm)
 844                 ctl2 |= BLM_POLARITY_I965;
 845         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 846         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 847         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 848 }
 849
 850 void intel_panel_enable_backlight(struct intel_connector *connector)
 851 {
 852         struct drm_device *dev = connector->base.dev;
 853         struct drm_i915_private *dev_priv = dev->dev_private;
 854         struct intel_panel *panel = &connector->panel;
 855         enum pipe pipe = intel_get_pipe_from_connector(connector);
 856         unsigned long flags;
 857
 858         if (!panel->backlight.present || pipe == INVALID_PIPE)
 859                 return;
 860
 861         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 862
 863         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 864
 865         WARN_ON(panel->backlight.max == 0);
 866
 867         if (panel->backlight.level == 0) {
 868                 panel->backlight.level = panel->backlight.max;
 869                 if (panel->backlight.device)
 870                         panel->backlight.device->props.brightness =
 871                                 panel->backlight.level;
 872         }
 873
 874         dev_priv->display.enable_backlight(connector);
 875         panel->backlight.enabled = true;
 876
 877         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 878 }
 879
 880 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 881 static int intel_backlight_device_update_status(struct backlight_device *bd)
 882 {
 883         struct intel_connector *connector = bl_get_data(bd);
 884         struct drm_device *dev = connector->base.dev;
 885
 886         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 887         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 888                       bd->props.brightness, bd->props.max_brightness);
 889         intel_panel_set_backlight(connector, bd->props.brightness,
 890                                   bd->props.max_brightness);
 891         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 892         return 0;
 893 }
 894
 895 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 896 {
 897         struct intel_connector *connector = bl_get_data(bd);
 898         struct drm_device *dev = connector->base.dev;
 899         struct drm_i915_private *dev_priv = dev->dev_private;
 900         int ret;
 901
 902         intel_runtime_pm_get(dev_priv);
 903         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 904         ret = intel_panel_get_backlight(connector);
 905         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 906         intel_runtime_pm_put(dev_priv);
 907
 908         return ret;
 909 }
 910
 911 static const struct backlight_ops intel_backlight_device_ops = {
 912         .update_status = intel_backlight_device_update_status,
 913         .get_brightness = intel_backlight_device_get_brightness,
 914 };
 915
 916 static int intel_backlight_device_register(struct intel_connector *connector)
 917 {
 918         struct intel_panel *panel = &connector->panel;
 919         struct backlight_properties props;
 920
 921         if (WARN_ON(panel->backlight.device))
 922                 return -ENODEV;
 923
 924         BUG_ON(panel->backlight.max == 0);
 925
 926         memset(&props, 0, sizeof(props));
 927         props.type = BACKLIGHT_RAW;
 928         props.brightness = panel->backlight.level;
 929         props.max_brightness = panel->backlight.max;
 930
 931         /*
 932          * Note: using the same name independent of the connector prevents
 933          * registration of multiple backlight devices in the driver.
 934          */
 935         panel->backlight.device =
 936                 backlight_device_register("intel_backlight",
 937                                           connector->base.kdev,
 938                                           connector,
 939                                           &intel_backlight_device_ops, &props);
 940
 941         if (IS_ERR(panel->backlight.device)) {
 942                 DRM_ERROR("Failed to register backlight: %ld\n",
 943                           PTR_ERR(panel->backlight.device));
 944                 panel->backlight.device = NULL;
 945                 return -ENODEV;
 946         }
 947         return 0;
 948 }
 949
 950 static void intel_backlight_device_unregister(struct intel_connector *connector)
 951 {
 952         struct intel_panel *panel = &connector->panel;
 953
 954         if (panel->backlight.device) {
 955                 backlight_device_unregister(panel->backlight.device);
 956                 panel->backlight.device = NULL;
 957         }
 958 }
 959 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 960 static int intel_backlight_device_register(struct intel_connector *connector)
 961 {
 962         return 0;
 963 }
 964 static void intel_backlight_device_unregister(struct intel_connector *connector)
 965 {
 966 }
 967 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 968
 969 /*
 970  * Note: The setup hooks can't assume pipe is set!
 971  *
 972  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
 973  * appropriately when it's 0. Use VBT and/or sane defaults.
 974  */
 975 static int bdw_setup_backlight(struct intel_connector *connector)
 976 {
 977         struct drm_device *dev = connector->base.dev;
 978         struct drm_i915_private *dev_priv = dev->dev_private;
 979         struct intel_panel *panel = &connector->panel;
 980         u32 pch_ctl1, pch_ctl2, val;
 981
 982         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 983         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
 984
 985         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
 986         panel->backlight.max = pch_ctl2 >> 16;
 987         if (!panel->backlight.max)
 988                 return -ENODEV;
 989
 990         val = bdw_get_backlight(connector);
 991         panel->backlight.level = intel_panel_compute_brightness(connector, val);
 992
 993         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
 994                 panel->backlight.level != 0;
 995
 996         return 0;
 997 }
 998
 999 static int pch_setup_backlight(struct intel_connector *connector)
1000 {
1001         struct drm_device *dev = connector->base.dev;
1002         struct drm_i915_private *dev_priv = dev->dev_private;
1003         struct intel_panel *panel = &connector->panel;
1004         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1005
1006         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1007         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1008
1009         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1010         panel->backlight.max = pch_ctl2 >> 16;
1011         if (!panel->backlight.max)
1012                 return -ENODEV;
1013
1014         val = pch_get_backlight(connector);
1015         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1016
1017         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1018         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1019                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1020
1021         return 0;
1022 }
1023
1024 static int i9xx_setup_backlight(struct intel_connector *connector)
1025 {
1026         struct drm_device *dev = connector->base.dev;
1027         struct drm_i915_private *dev_priv = dev->dev_private;
1028         struct intel_panel *panel = &connector->panel;
1029         u32 ctl, val;
1030
1031         ctl = I915_READ(BLC_PWM_CTL);
1032
1033         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1034                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1035
1036         if (IS_PINEVIEW(dev))
1037                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1038
1039         panel->backlight.max = ctl >> 17;
1040         if (panel->backlight.combination_mode)
1041                 panel->backlight.max *= 0xff;
1042
1043         if (!panel->backlight.max)
1044                 return -ENODEV;
1045
1046         val = i9xx_get_backlight(connector);
1047         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1048
1049         panel->backlight.enabled = panel->backlight.level != 0;
1050
1051         return 0;
1052 }
1053
1054 static int i965_setup_backlight(struct intel_connector *connector)
1055 {
1056         struct drm_device *dev = connector->base.dev;
1057         struct drm_i915_private *dev_priv = dev->dev_private;
1058         struct intel_panel *panel = &connector->panel;
1059         u32 ctl, ctl2, val;
1060
1061         ctl2 = I915_READ(BLC_PWM_CTL2);
1062         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1063         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1064
1065         ctl = I915_READ(BLC_PWM_CTL);
1066         panel->backlight.max = ctl >> 16;
1067         if (panel->backlight.combination_mode)
1068                 panel->backlight.max *= 0xff;
1069
1070         if (!panel->backlight.max)
1071                 return -ENODEV;
1072
1073         val = i9xx_get_backlight(connector);
1074         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1075
1076         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1077                 panel->backlight.level != 0;
1078
1079         return 0;
1080 }
1081
1082 static int vlv_setup_backlight(struct intel_connector *connector)
1083 {
1084         struct drm_device *dev = connector->base.dev;
1085         struct drm_i915_private *dev_priv = dev->dev_private;
1086         struct intel_panel *panel = &connector->panel;
1087         enum pipe pipe;
1088         u32 ctl, ctl2, val;
1089
1090         for_each_pipe(pipe) {
1091                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1092
1093                 /* Skip if the modulation freq is already set */
1094                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1095                         continue;
1096
1097                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1098                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1099                            cur_val);
1100         }
1101
1102         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
1103         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1104
1105         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
1106         panel->backlight.max = ctl >> 16;
1107         if (!panel->backlight.max)
1108                 return -ENODEV;
1109
1110         val = _vlv_get_backlight(dev, PIPE_A);
1111         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1112
1113         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1114                 panel->backlight.level != 0;
1115
1116         return 0;
1117 }
1118
1119 int intel_panel_setup_backlight(struct drm_connector *connector)
1120 {
1121         struct drm_device *dev = connector->dev;
1122         struct drm_i915_private *dev_priv = dev->dev_private;
1123         struct intel_connector *intel_connector = to_intel_connector(connector);
1124         struct intel_panel *panel = &intel_connector->panel;
1125         unsigned long flags;
1126         int ret;
1127
1128         if (!dev_priv->vbt.backlight.present) {
1129                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1130                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1131                 } else {
1132                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1133                         return 0;
1134                 }
1135         }
1136
1137         /* set level and max in panel struct */
1138         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
1139         ret = dev_priv->display.setup_backlight(intel_connector);
1140         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
1141
1142         if (ret) {
1143                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1144                               connector->name);
1145                 return ret;
1146         }
1147
1148         intel_backlight_device_register(intel_connector);
1149
1150         panel->backlight.present = true;
1151
1152         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1153                       "sysfs interface %sregistered\n",
1154                       panel->backlight.enabled ? "enabled" : "disabled",
1155                       panel->backlight.level, panel->backlight.max,
1156                       panel->backlight.device ? "" : "not ");
1157
1158         return 0;
1159 }
1160
1161 void intel_panel_destroy_backlight(struct drm_connector *connector)
1162 {
1163         struct intel_connector *intel_connector = to_intel_connector(connector);
1164         struct intel_panel *panel = &intel_connector->panel;
1165
1166         panel->backlight.present = false;
1167         intel_backlight_device_unregister(intel_connector);
1168 }
1169
1170 /* Set up chip specific backlight functions */
1171 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1172 {
1173         struct drm_i915_private *dev_priv = dev->dev_private;
1174
1175         if (IS_BROADWELL(dev)) {
1176                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1177                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1178                 dev_priv->display.disable_backlight = pch_disable_backlight;
1179                 dev_priv->display.set_backlight = bdw_set_backlight;
1180                 dev_priv->display.get_backlight = bdw_get_backlight;
1181         } else if (HAS_PCH_SPLIT(dev)) {
1182                 dev_priv->display.setup_backlight = pch_setup_backlight;
1183                 dev_priv->display.enable_backlight = pch_enable_backlight;
1184                 dev_priv->display.disable_backlight = pch_disable_backlight;
1185                 dev_priv->display.set_backlight = pch_set_backlight;
1186                 dev_priv->display.get_backlight = pch_get_backlight;
1187         } else if (IS_VALLEYVIEW(dev)) {
1188                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1189                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1190                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1191                 dev_priv->display.set_backlight = vlv_set_backlight;
1192                 dev_priv->display.get_backlight = vlv_get_backlight;
1193         } else if (IS_GEN4(dev)) {
1194                 dev_priv->display.setup_backlight = i965_setup_backlight;
1195                 dev_priv->display.enable_backlight = i965_enable_backlight;
1196                 dev_priv->display.disable_backlight = i965_disable_backlight;
1197                 dev_priv->display.set_backlight = i9xx_set_backlight;
1198                 dev_priv->display.get_backlight = i9xx_get_backlight;
1199         } else {
1200                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1201                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1202                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1203                 dev_priv->display.set_backlight = i9xx_set_backlight;
1204                 dev_priv->display.get_backlight = i9xx_get_backlight;
1205         }
1206 }
1207
1208 int intel_panel_init(struct intel_panel *panel,
1209                      struct drm_display_mode *fixed_mode,
1210                      struct drm_display_mode *downclock_mode)
1211 {
1212         panel->fixed_mode = fixed_mode;
1213         panel->downclock_mode = downclock_mode;
1214
1215         return 0;
1216 }
1217
1218 void intel_panel_fini(struct intel_panel *panel)
1219 {
1220         struct intel_connector *intel_connector =
1221                 container_of(panel, struct intel_connector, panel);
1222
1223         if (panel->fixed_mode)
1224                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1225
1226         if (panel->downclock_mode)
1227                 drm_mode_destroy(intel_connector->base.dev,
1228                                 panel->downclock_mode);
1229 }