sys/dev/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 #include <linux/moduleparam.h>
  32 #include "intel_drv.h"
  33
  34 void
  35 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  36                        struct drm_display_mode *adjusted_mode)
  37 {
  38         drm_mode_copy(adjusted_mode, fixed_mode);
  39
  40         drm_mode_set_crtcinfo(adjusted_mode, 0);
  41 }
  42
  43 /**
  44  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  45  * @dev: drm device
  46  * @fixed_mode : panel native mode
  47  * @connector: LVDS/eDP connector
  48  *
  49  * Return downclock_avail
  50  * Find the reduced downclock for LVDS/eDP in EDID.
  51  */
  52 struct drm_display_mode *
  53 intel_find_panel_downclock(struct drm_device *dev,
  54                         struct drm_display_mode *fixed_mode,
  55                         struct drm_connector *connector)
  56 {
  57         struct drm_display_mode *scan, *tmp_mode;
  58         int temp_downclock;
  59
  60         temp_downclock = fixed_mode->clock;
  61         tmp_mode = NULL;
  62
  63         list_for_each_entry(scan, &connector->probed_modes, head) {
  64                 /*
  65                  * If one mode has the same resolution with the fixed_panel
  66                  * mode while they have the different refresh rate, it means
  67                  * that the reduced downclock is found. In such
  68                  * case we can set the different FPx0/1 to dynamically select
  69                  * between low and high frequency.
  70                  */
  71                 if (scan->hdisplay == fixed_mode->hdisplay &&
  72                     scan->hsync_start == fixed_mode->hsync_start &&
  73                     scan->hsync_end == fixed_mode->hsync_end &&
  74                     scan->htotal == fixed_mode->htotal &&
  75                     scan->vdisplay == fixed_mode->vdisplay &&
  76                     scan->vsync_start == fixed_mode->vsync_start &&
  77                     scan->vsync_end == fixed_mode->vsync_end &&
  78                     scan->vtotal == fixed_mode->vtotal) {
  79                         if (scan->clock < temp_downclock) {
  80                                 /*
  81                                  * The downclock is already found. But we
  82                                  * expect to find the lower downclock.
  83                                  */
  84                                 temp_downclock = scan->clock;
  85                                 tmp_mode = scan;
  86                         }
  87                 }
  88         }
  89
  90         if (temp_downclock < fixed_mode->clock)
  91                 return drm_mode_duplicate(dev, tmp_mode);
  92         else
  93                 return NULL;
  94 }
  95
  96 /* adjusted_mode has been preset to be the panel's fixed mode */
  97 void
  98 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
  99                         struct intel_crtc_config *pipe_config,
 100                         int fitting_mode)
 101 {
 102         struct drm_display_mode *adjusted_mode;
 103         int x, y, width, height;
 104
 105         adjusted_mode = &pipe_config->adjusted_mode;
 106
 107         x = y = width = height = 0;
 108
 109         /* Native modes don't need fitting */
 110         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 111             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 112                 goto done;
 113
 114         switch (fitting_mode) {
 115         case DRM_MODE_SCALE_CENTER:
 116                 width = pipe_config->pipe_src_w;
 117                 height = pipe_config->pipe_src_h;
 118                 x = (adjusted_mode->hdisplay - width + 1)/2;
 119                 y = (adjusted_mode->vdisplay - height + 1)/2;
 120                 break;
 121
 122         case DRM_MODE_SCALE_ASPECT:
 123                 /* Scale but preserve the aspect ratio */
 124                 {
 125                         u32 scaled_width = adjusted_mode->hdisplay
 126                                 * pipe_config->pipe_src_h;
 127                         u32 scaled_height = pipe_config->pipe_src_w
 128                                 * adjusted_mode->vdisplay;
 129                         if (scaled_width > scaled_height) { /* pillar */
 130                                 width = scaled_height / pipe_config->pipe_src_h;
 131                                 if (width & 1)
 132                                         width++;
 133                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
 134                                 y = 0;
 135                                 height = adjusted_mode->vdisplay;
 136                         } else if (scaled_width < scaled_height) { /* letter */
 137                                 height = scaled_width / pipe_config->pipe_src_w;
 138                                 if (height & 1)
 139                                     height++;
 140                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
 141                                 x = 0;
 142                                 width = adjusted_mode->hdisplay;
 143                         } else {
 144                                 x = y = 0;
 145                                 width = adjusted_mode->hdisplay;
 146                                 height = adjusted_mode->vdisplay;
 147                         }
 148                 }
 149                 break;
 150
 151         case DRM_MODE_SCALE_FULLSCREEN:
 152                 x = y = 0;
 153                 width = adjusted_mode->hdisplay;
 154                 height = adjusted_mode->vdisplay;
 155                 break;
 156
 157         default:
 158                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 159                 return;
 160         }
 161
 162 done:
 163         pipe_config->pch_pfit.pos = (x << 16) | y;
 164         pipe_config->pch_pfit.size = (width << 16) | height;
 165         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 166 }
 167
 168 static void
 169 centre_horizontally(struct drm_display_mode *mode,
 170                     int width)
 171 {
 172         u32 border, sync_pos, blank_width, sync_width;
 173
 174         /* keep the hsync and hblank widths constant */
 175         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 176         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 177         sync_pos = (blank_width - sync_width + 1) / 2;
 178
 179         border = (mode->hdisplay - width + 1) / 2;
 180         border += border & 1; /* make the border even */
 181
 182         mode->crtc_hdisplay = width;
 183         mode->crtc_hblank_start = width + border;
 184         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 185
 186         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 187         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 188 }
 189
 190 static void
 191 centre_vertically(struct drm_display_mode *mode,
 192                   int height)
 193 {
 194         u32 border, sync_pos, blank_width, sync_width;
 195
 196         /* keep the vsync and vblank widths constant */
 197         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 198         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 199         sync_pos = (blank_width - sync_width + 1) / 2;
 200
 201         border = (mode->vdisplay - height + 1) / 2;
 202
 203         mode->crtc_vdisplay = height;
 204         mode->crtc_vblank_start = height + border;
 205         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 206
 207         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 208         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 209 }
 210
 211 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 212 {
 213         /*
 214          * Floating point operation is not supported. So the FACTOR
 215          * is defined, which can avoid the floating point computation
 216          * when calculating the panel ratio.
 217          */
 218 #define ACCURACY 12
 219 #define FACTOR (1 << ACCURACY)
 220         u32 ratio = source * FACTOR / target;
 221         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 222 }
 223
 224 static void i965_scale_aspect(struct intel_crtc_config *pipe_config,
 225                               u32 *pfit_control)
 226 {
 227         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 228         u32 scaled_width = adjusted_mode->hdisplay *
 229                 pipe_config->pipe_src_h;
 230         u32 scaled_height = pipe_config->pipe_src_w *
 231                 adjusted_mode->vdisplay;
 232
 233         /* 965+ is easy, it does everything in hw */
 234         if (scaled_width > scaled_height)
 235                 *pfit_control |= PFIT_ENABLE |
 236                         PFIT_SCALING_PILLAR;
 237         else if (scaled_width < scaled_height)
 238                 *pfit_control |= PFIT_ENABLE |
 239                         PFIT_SCALING_LETTER;
 240         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 241                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 242 }
 243
 244 static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config,
 245                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 246                               u32 *border)
 247 {
 248         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 249         u32 scaled_width = adjusted_mode->hdisplay *
 250                 pipe_config->pipe_src_h;
 251         u32 scaled_height = pipe_config->pipe_src_w *
 252                 adjusted_mode->vdisplay;
 253         u32 bits;
 254
 255         /*
 256          * For earlier chips we have to calculate the scaling
 257          * ratio by hand and program it into the
 258          * PFIT_PGM_RATIO register
 259          */
 260         if (scaled_width > scaled_height) { /* pillar */
 261                 centre_horizontally(adjusted_mode,
 262                                     scaled_height /
 263                                     pipe_config->pipe_src_h);
 264
 265                 *border = LVDS_BORDER_ENABLE;
 266                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 267                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 268                                                     adjusted_mode->vdisplay);
 269
 270                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 271                                              bits << PFIT_VERT_SCALE_SHIFT);
 272                         *pfit_control |= (PFIT_ENABLE |
 273                                           VERT_INTERP_BILINEAR |
 274                                           HORIZ_INTERP_BILINEAR);
 275                 }
 276         } else if (scaled_width < scaled_height) { /* letter */
 277                 centre_vertically(adjusted_mode,
 278                                   scaled_width /
 279                                   pipe_config->pipe_src_w);
 280
 281                 *border = LVDS_BORDER_ENABLE;
 282                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 283                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 284                                                     adjusted_mode->hdisplay);
 285
 286                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 287                                              bits << PFIT_VERT_SCALE_SHIFT);
 288                         *pfit_control |= (PFIT_ENABLE |
 289                                           VERT_INTERP_BILINEAR |
 290                                           HORIZ_INTERP_BILINEAR);
 291                 }
 292         } else {
 293                 /* Aspects match, Let hw scale both directions */
 294                 *pfit_control |= (PFIT_ENABLE |
 295                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 296                                   VERT_INTERP_BILINEAR |
 297                                   HORIZ_INTERP_BILINEAR);
 298         }
 299 }
 300
 301 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 302                               struct intel_crtc_config *pipe_config,
 303                               int fitting_mode)
 304 {
 305         struct drm_device *dev = intel_crtc->base.dev;
 306         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 307         struct drm_display_mode *adjusted_mode;
 308
 309         adjusted_mode = &pipe_config->adjusted_mode;
 310
 311         /* Native modes don't need fitting */
 312         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 313             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 314                 goto out;
 315
 316         switch (fitting_mode) {
 317         case DRM_MODE_SCALE_CENTER:
 318                 /*
 319                  * For centered modes, we have to calculate border widths &
 320                  * heights and modify the values programmed into the CRTC.
 321                  */
 322                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 323                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 324                 border = LVDS_BORDER_ENABLE;
 325                 break;
 326         case DRM_MODE_SCALE_ASPECT:
 327                 /* Scale but preserve the aspect ratio */
 328                 if (INTEL_INFO(dev)->gen >= 4)
 329                         i965_scale_aspect(pipe_config, &pfit_control);
 330                 else
 331                         i9xx_scale_aspect(pipe_config, &pfit_control,
 332                                           &pfit_pgm_ratios, &border);
 333                 break;
 334         case DRM_MODE_SCALE_FULLSCREEN:
 335                 /*
 336                  * Full scaling, even if it changes the aspect ratio.
 337                  * Fortunately this is all done for us in hw.
 338                  */
 339                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 340                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 341                         pfit_control |= PFIT_ENABLE;
 342                         if (INTEL_INFO(dev)->gen >= 4)
 343                                 pfit_control |= PFIT_SCALING_AUTO;
 344                         else
 345                                 pfit_control |= (VERT_AUTO_SCALE |
 346                                                  VERT_INTERP_BILINEAR |
 347                                                  HORIZ_AUTO_SCALE |
 348                                                  HORIZ_INTERP_BILINEAR);
 349                 }
 350                 break;
 351         default:
 352                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 353                 return;
 354         }
 355
 356         /* 965+ wants fuzzy fitting */
 357         /* FIXME: handle multiple panels by failing gracefully */
 358         if (INTEL_INFO(dev)->gen >= 4)
 359                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 360                                  PFIT_FILTER_FUZZY);
 361
 362 out:
 363         if ((pfit_control & PFIT_ENABLE) == 0) {
 364                 pfit_control = 0;
 365                 pfit_pgm_ratios = 0;
 366         }
 367
 368         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 369         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 370                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 371
 372         pipe_config->gmch_pfit.control = pfit_control;
 373         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 374         pipe_config->gmch_pfit.lvds_border_bits = border;
 375 }
 376
 377 enum drm_connector_status
 378 intel_panel_detect(struct drm_device *dev)
 379 {
 380         struct drm_i915_private *dev_priv = dev->dev_private;
 381
 382         /* Assume that the BIOS does not lie through the OpRegion... */
 383         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 384                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 385                         connector_status_connected :
 386                         connector_status_disconnected;
 387         }
 388
 389         switch (i915.panel_ignore_lid) {
 390         case -2:
 391                 return connector_status_connected;
 392         case -1:
 393                 return connector_status_disconnected;
 394         default:
 395                 return connector_status_unknown;
 396         }
 397 }
 398
 399 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 400                                           u32 val)
 401 {
 402         struct drm_device *dev = connector->base.dev;
 403         struct drm_i915_private *dev_priv = dev->dev_private;
 404         struct intel_panel *panel = &connector->panel;
 405
 406         WARN_ON(panel->backlight.max == 0);
 407
 408         if (i915.invert_brightness < 0)
 409                 return val;
 410
 411         if (i915.invert_brightness > 0 ||
 412             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 413                 return panel->backlight.max - val;
 414         }
 415
 416         return val;
 417 }
 418
 419 static u32 bdw_get_backlight(struct intel_connector *connector)
 420 {
 421         struct drm_device *dev = connector->base.dev;
 422         struct drm_i915_private *dev_priv = dev->dev_private;
 423
 424         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 425 }
 426
 427 static u32 pch_get_backlight(struct intel_connector *connector)
 428 {
 429         struct drm_device *dev = connector->base.dev;
 430         struct drm_i915_private *dev_priv = dev->dev_private;
 431
 432         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 433 }
 434
 435 static u32 i9xx_get_backlight(struct intel_connector *connector)
 436 {
 437         struct drm_device *dev = connector->base.dev;
 438         struct drm_i915_private *dev_priv = dev->dev_private;
 439         struct intel_panel *panel = &connector->panel;
 440         u32 val;
 441
 442         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 443         if (INTEL_INFO(dev)->gen < 4)
 444                 val >>= 1;
 445
 446         if (panel->backlight.combination_mode) {
 447                 u8 lbpc;
 448
 449                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 450                 val *= lbpc;
 451         }
 452
 453         return val;
 454 }
 455
 456 static u32 _vlv_get_backlight(struct drm_device *dev, enum i915_pipe pipe)
 457 {
 458         struct drm_i915_private *dev_priv = dev->dev_private;
 459
 460         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 461 }
 462
 463 static u32 vlv_get_backlight(struct intel_connector *connector)
 464 {
 465         struct drm_device *dev = connector->base.dev;
 466         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 467
 468         return _vlv_get_backlight(dev, pipe);
 469 }
 470
 471 #if 0
 472 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 473 {
 474         struct drm_device *dev = connector->base.dev;
 475         struct drm_i915_private *dev_priv = dev->dev_private;
 476         u32 val;
 477         unsigned long flags;
 478
 479         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 480
 481         val = dev_priv->display.get_backlight(connector);
 482         val = intel_panel_compute_brightness(connector, val);
 483
 484         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 485
 486         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 487         return val;
 488 }
 489 #endif
 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 i915_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 i915_pipe pipe = intel_get_pipe_from_connector(connector);
 568         u32 freq;
 569
 570         if (!panel->backlight.present || pipe == INVALID_PIPE)
 571                 return;
 572
 573         spin_lock(&dev_priv->backlight_lock);
 574
 575         WARN_ON(panel->backlight.max == 0);
 576
 577         /* scale to hardware max, but be careful to not overflow */
 578         freq = panel->backlight.max;
 579         if (freq < max)
 580                 level = level * freq / max;
 581         else
 582                 level = freq / max * level;
 583
 584         panel->backlight.level = level;
 585         if (panel->backlight.device)
 586                 panel->backlight.device->props.brightness = level;
 587
 588         if (panel->backlight.enabled)
 589                 intel_panel_actually_set_backlight(connector, level);
 590
 591         spin_unlock(&dev_priv->backlight_lock);
 592 }
 593
 594 static void pch_disable_backlight(struct intel_connector *connector)
 595 {
 596         struct drm_device *dev = connector->base.dev;
 597         struct drm_i915_private *dev_priv = dev->dev_private;
 598         u32 tmp;
 599
 600         intel_panel_actually_set_backlight(connector, 0);
 601
 602         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 603         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 604
 605         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 606         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 607 }
 608
 609 static void i9xx_disable_backlight(struct intel_connector *connector)
 610 {
 611         intel_panel_actually_set_backlight(connector, 0);
 612 }
 613
 614 static void i965_disable_backlight(struct intel_connector *connector)
 615 {
 616         struct drm_device *dev = connector->base.dev;
 617         struct drm_i915_private *dev_priv = dev->dev_private;
 618         u32 tmp;
 619
 620         intel_panel_actually_set_backlight(connector, 0);
 621
 622         tmp = I915_READ(BLC_PWM_CTL2);
 623         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 624 }
 625
 626 static void vlv_disable_backlight(struct intel_connector *connector)
 627 {
 628         struct drm_device *dev = connector->base.dev;
 629         struct drm_i915_private *dev_priv = dev->dev_private;
 630         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 631         u32 tmp;
 632
 633         intel_panel_actually_set_backlight(connector, 0);
 634
 635         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 636         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 637 }
 638
 639 void intel_panel_disable_backlight(struct intel_connector *connector)
 640 {
 641         struct drm_device *dev = connector->base.dev;
 642         struct drm_i915_private *dev_priv = dev->dev_private;
 643         struct intel_panel *panel = &connector->panel;
 644         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 645
 646         if (!panel->backlight.present || pipe == INVALID_PIPE)
 647                 return;
 648
 649         /*
 650          * Do not disable backlight on the vgaswitcheroo path. When switching
 651          * away from i915, the other client may depend on i915 to handle the
 652          * backlight. This will leave the backlight on unnecessarily when
 653          * another client is not activated.
 654          */
 655         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 656                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 657                 return;
 658         }
 659
 660         spin_lock(&dev_priv->backlight_lock);
 661
 662         panel->backlight.enabled = false;
 663         dev_priv->display.disable_backlight(connector);
 664
 665         spin_unlock(&dev_priv->backlight_lock);
 666 }
 667
 668 static void bdw_enable_backlight(struct intel_connector *connector)
 669 {
 670         struct drm_device *dev = connector->base.dev;
 671         struct drm_i915_private *dev_priv = dev->dev_private;
 672         struct intel_panel *panel = &connector->panel;
 673         u32 pch_ctl1, pch_ctl2;
 674
 675         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 676         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 677                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 678                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 679                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 680         }
 681
 682         pch_ctl2 = panel->backlight.max << 16;
 683         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 684
 685         pch_ctl1 = 0;
 686         if (panel->backlight.active_low_pwm)
 687                 pch_ctl1 |= BLM_PCH_POLARITY;
 688
 689         /* BDW always uses the pch pwm controls. */
 690         pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 691
 692         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 693         POSTING_READ(BLC_PWM_PCH_CTL1);
 694         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 695
 696         /* This won't stick until the above enable. */
 697         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 698 }
 699
 700 static void pch_enable_backlight(struct intel_connector *connector)
 701 {
 702         struct drm_device *dev = connector->base.dev;
 703         struct drm_i915_private *dev_priv = dev->dev_private;
 704         struct intel_panel *panel = &connector->panel;
 705         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 706         enum transcoder cpu_transcoder =
 707                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 708         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 709
 710         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 711         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 712                 WARN(1, "cpu backlight already enabled\n");
 713                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 714                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 715         }
 716
 717         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 718         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 719                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 720                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 721                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 722         }
 723
 724         if (cpu_transcoder == TRANSCODER_EDP)
 725                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 726         else
 727                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 728         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 729         POSTING_READ(BLC_PWM_CPU_CTL2);
 730         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 731
 732         /* This won't stick until the above enable. */
 733         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 734
 735         pch_ctl2 = panel->backlight.max << 16;
 736         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 737
 738         pch_ctl1 = 0;
 739         if (panel->backlight.active_low_pwm)
 740                 pch_ctl1 |= BLM_PCH_POLARITY;
 741
 742         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 743         POSTING_READ(BLC_PWM_PCH_CTL1);
 744         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 745 }
 746
 747 static void i9xx_enable_backlight(struct intel_connector *connector)
 748 {
 749         struct drm_device *dev = connector->base.dev;
 750         struct drm_i915_private *dev_priv = dev->dev_private;
 751         struct intel_panel *panel = &connector->panel;
 752         u32 ctl, freq;
 753
 754         ctl = I915_READ(BLC_PWM_CTL);
 755         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 756                 WARN(1, "backlight already enabled\n");
 757                 I915_WRITE(BLC_PWM_CTL, 0);
 758         }
 759
 760         freq = panel->backlight.max;
 761         if (panel->backlight.combination_mode)
 762                 freq /= 0xff;
 763
 764         ctl = freq << 17;
 765         if (panel->backlight.combination_mode)
 766                 ctl |= BLM_LEGACY_MODE;
 767         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 768                 ctl |= BLM_POLARITY_PNV;
 769
 770         I915_WRITE(BLC_PWM_CTL, ctl);
 771         POSTING_READ(BLC_PWM_CTL);
 772
 773         /* XXX: combine this into above write? */
 774         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 775 }
 776
 777 static void i965_enable_backlight(struct intel_connector *connector)
 778 {
 779         struct drm_device *dev = connector->base.dev;
 780         struct drm_i915_private *dev_priv = dev->dev_private;
 781         struct intel_panel *panel = &connector->panel;
 782         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 783         u32 ctl, ctl2, freq;
 784
 785         ctl2 = I915_READ(BLC_PWM_CTL2);
 786         if (ctl2 & BLM_PWM_ENABLE) {
 787                 WARN(1, "backlight already enabled\n");
 788                 ctl2 &= ~BLM_PWM_ENABLE;
 789                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 790         }
 791
 792         freq = panel->backlight.max;
 793         if (panel->backlight.combination_mode)
 794                 freq /= 0xff;
 795
 796         ctl = freq << 16;
 797         I915_WRITE(BLC_PWM_CTL, ctl);
 798
 799         ctl2 = BLM_PIPE(pipe);
 800         if (panel->backlight.combination_mode)
 801                 ctl2 |= BLM_COMBINATION_MODE;
 802         if (panel->backlight.active_low_pwm)
 803                 ctl2 |= BLM_POLARITY_I965;
 804         I915_WRITE(BLC_PWM_CTL2, ctl2);
 805         POSTING_READ(BLC_PWM_CTL2);
 806         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 807
 808         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 809 }
 810
 811 static void vlv_enable_backlight(struct intel_connector *connector)
 812 {
 813         struct drm_device *dev = connector->base.dev;
 814         struct drm_i915_private *dev_priv = dev->dev_private;
 815         struct intel_panel *panel = &connector->panel;
 816         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 817         u32 ctl, ctl2;
 818
 819         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 820         if (ctl2 & BLM_PWM_ENABLE) {
 821                 WARN(1, "backlight already enabled\n");
 822                 ctl2 &= ~BLM_PWM_ENABLE;
 823                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 824         }
 825
 826         ctl = panel->backlight.max << 16;
 827         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 828
 829         /* XXX: combine this into above write? */
 830         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 831
 832         ctl2 = 0;
 833         if (panel->backlight.active_low_pwm)
 834                 ctl2 |= BLM_POLARITY_I965;
 835         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 836         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 837         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 838 }
 839
 840 void intel_panel_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         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 846
 847         if (!panel->backlight.present || pipe == INVALID_PIPE)
 848                 return;
 849
 850         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 851
 852         spin_lock(&dev_priv->backlight_lock);
 853
 854         WARN_ON(panel->backlight.max == 0);
 855
 856         if (panel->backlight.level == 0) {
 857                 panel->backlight.level = panel->backlight.max;
 858                 if (panel->backlight.device)
 859                         panel->backlight.device->props.brightness =
 860                                 panel->backlight.level;
 861         }
 862
 863         dev_priv->display.enable_backlight(connector);
 864         panel->backlight.enabled = true;
 865
 866         spin_unlock(&dev_priv->backlight_lock);
 867 }
 868
 869 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 870 static int intel_backlight_device_update_status(struct backlight_device *bd)
 871 {
 872         struct intel_connector *connector = bl_get_data(bd);
 873         struct drm_device *dev = connector->base.dev;
 874
 875         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 876         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 877                       bd->props.brightness, bd->props.max_brightness);
 878         intel_panel_set_backlight(connector, bd->props.brightness,
 879                                   bd->props.max_brightness);
 880         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 881         return 0;
 882 }
 883
 884 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 885 {
 886         struct intel_connector *connector = bl_get_data(bd);
 887         struct drm_device *dev = connector->base.dev;
 888         struct drm_i915_private *dev_priv = dev->dev_private;
 889         int ret;
 890
 891         intel_runtime_pm_get(dev_priv);
 892         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 893         ret = intel_panel_get_backlight(connector);
 894         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 895         intel_runtime_pm_put(dev_priv);
 896
 897         return ret;
 898 }
 899
 900 static const struct backlight_ops intel_backlight_device_ops = {
 901         .update_status = intel_backlight_device_update_status,
 902         .get_brightness = intel_backlight_device_get_brightness,
 903 };
 904
 905 static int intel_backlight_device_register(struct intel_connector *connector)
 906 {
 907         struct intel_panel *panel = &connector->panel;
 908         struct backlight_properties props;
 909
 910         if (WARN_ON(panel->backlight.device))
 911                 return -ENODEV;
 912
 913         BUG_ON(panel->backlight.max == 0);
 914
 915         memset(&props, 0, sizeof(props));
 916         props.type = BACKLIGHT_RAW;
 917         props.brightness = panel->backlight.level;
 918         props.max_brightness = panel->backlight.max;
 919
 920         /*
 921          * Note: using the same name independent of the connector prevents
 922          * registration of multiple backlight devices in the driver.
 923          */
 924         panel->backlight.device =
 925                 backlight_device_register("intel_backlight",
 926                                           connector->base.kdev,
 927                                           connector,
 928                                           &intel_backlight_device_ops, &props);
 929
 930         if (IS_ERR(panel->backlight.device)) {
 931                 DRM_ERROR("Failed to register backlight: %ld\n",
 932                           PTR_ERR(panel->backlight.device));
 933                 panel->backlight.device = NULL;
 934                 return -ENODEV;
 935         }
 936         return 0;
 937 }
 938
 939 static void intel_backlight_device_unregister(struct intel_connector *connector)
 940 {
 941         struct intel_panel *panel = &connector->panel;
 942
 943         if (panel->backlight.device) {
 944                 backlight_device_unregister(panel->backlight.device);
 945                 panel->backlight.device = NULL;
 946         }
 947 }
 948 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 949 static int intel_backlight_device_register(struct intel_connector *connector)
 950 {
 951         return 0;
 952 }
 953 static void intel_backlight_device_unregister(struct intel_connector *connector)
 954 {
 955 }
 956 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 957
 958 /*
 959  * Note: The setup hooks can't assume pipe is set!
 960  *
 961  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
 962  * appropriately when it's 0. Use VBT and/or sane defaults.
 963  */
 964 static int bdw_setup_backlight(struct intel_connector *connector)
 965 {
 966         struct drm_device *dev = connector->base.dev;
 967         struct drm_i915_private *dev_priv = dev->dev_private;
 968         struct intel_panel *panel = &connector->panel;
 969         u32 pch_ctl1, pch_ctl2, val;
 970
 971         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 972         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
 973
 974         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
 975         panel->backlight.max = pch_ctl2 >> 16;
 976         if (!panel->backlight.max)
 977                 return -ENODEV;
 978
 979         val = bdw_get_backlight(connector);
 980         panel->backlight.level = intel_panel_compute_brightness(connector, val);
 981
 982         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
 983                 panel->backlight.level != 0;
 984
 985         return 0;
 986 }
 987
 988 static int pch_setup_backlight(struct intel_connector *connector)
 989 {
 990         struct drm_device *dev = connector->base.dev;
 991         struct drm_i915_private *dev_priv = dev->dev_private;
 992         struct intel_panel *panel = &connector->panel;
 993         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
 994
 995         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 996         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
 997
 998         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
 999         panel->backlight.max = pch_ctl2 >> 16;
1000         if (!panel->backlight.max)
1001                 return -ENODEV;
1002
1003         val = pch_get_backlight(connector);
1004         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1005
1006         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1007         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1008                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1009
1010         return 0;
1011 }
1012
1013 static int i9xx_setup_backlight(struct intel_connector *connector)
1014 {
1015         struct drm_device *dev = connector->base.dev;
1016         struct drm_i915_private *dev_priv = dev->dev_private;
1017         struct intel_panel *panel = &connector->panel;
1018         u32 ctl, val;
1019
1020         ctl = I915_READ(BLC_PWM_CTL);
1021
1022         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1023                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1024
1025         if (IS_PINEVIEW(dev))
1026                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1027
1028         panel->backlight.max = ctl >> 17;
1029         if (panel->backlight.combination_mode)
1030                 panel->backlight.max *= 0xff;
1031
1032         if (!panel->backlight.max)
1033                 return -ENODEV;
1034
1035         val = i9xx_get_backlight(connector);
1036         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1037
1038         panel->backlight.enabled = panel->backlight.level != 0;
1039
1040         return 0;
1041 }
1042
1043 static int i965_setup_backlight(struct intel_connector *connector)
1044 {
1045         struct drm_device *dev = connector->base.dev;
1046         struct drm_i915_private *dev_priv = dev->dev_private;
1047         struct intel_panel *panel = &connector->panel;
1048         u32 ctl, ctl2, val;
1049
1050         ctl2 = I915_READ(BLC_PWM_CTL2);
1051         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1052         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1053
1054         ctl = I915_READ(BLC_PWM_CTL);
1055         panel->backlight.max = ctl >> 16;
1056         if (panel->backlight.combination_mode)
1057                 panel->backlight.max *= 0xff;
1058
1059         if (!panel->backlight.max)
1060                 return -ENODEV;
1061
1062         val = i9xx_get_backlight(connector);
1063         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1064
1065         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1066                 panel->backlight.level != 0;
1067
1068         return 0;
1069 }
1070
1071 static int vlv_setup_backlight(struct intel_connector *connector)
1072 {
1073         struct drm_device *dev = connector->base.dev;
1074         struct drm_i915_private *dev_priv = dev->dev_private;
1075         struct intel_panel *panel = &connector->panel;
1076         enum i915_pipe pipe;
1077         u32 ctl, ctl2, val;
1078
1079         for_each_pipe(pipe) {
1080                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1081
1082                 /* Skip if the modulation freq is already set */
1083                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1084                         continue;
1085
1086                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1087                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1088                            cur_val);
1089         }
1090
1091         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
1092         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1093
1094         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
1095         panel->backlight.max = ctl >> 16;
1096         if (!panel->backlight.max)
1097                 return -ENODEV;
1098
1099         val = _vlv_get_backlight(dev, PIPE_A);
1100         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1101
1102         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1103                 panel->backlight.level != 0;
1104
1105         return 0;
1106 }
1107
1108 /* XXX: DragonFly-specific begin */
1109 /*
1110  * Read max backlight level
1111  */
1112 static int
1113 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1114 {
1115         int err, val;
1116         struct intel_connector *connector = arg1;
1117         struct drm_device *dev = connector->base.dev;
1118         struct drm_i915_private *dev_priv = dev->dev_private;
1119         struct intel_panel *panel = &connector->panel;
1120
1121         spin_lock(&dev_priv->backlight_lock);
1122         val = panel->backlight.max;
1123         spin_unlock(&dev_priv->backlight_lock);
1124
1125         err = sysctl_handle_int(oidp, &val, 0, req);
1126         return(err);
1127 }
1128
1129 /*
1130  * Read/write backlight level
1131  */
1132 static int
1133 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1134 {
1135         struct intel_connector *connector = arg1;
1136         struct drm_device *dev = connector->base.dev;
1137         struct drm_i915_private *dev_priv = dev->dev_private;
1138         struct intel_panel *panel = &connector->panel;
1139         int err, val;
1140         u32 max_brightness;
1141
1142         val = panel->backlight.level;
1143
1144         spin_lock(&dev_priv->backlight_lock);
1145         max_brightness = panel->backlight.max;
1146         spin_unlock(&dev_priv->backlight_lock);
1147
1148         err = sysctl_handle_int(oidp, &val, 0, req);
1149         if (err != 0 || req->newptr == NULL) {
1150                 return(err);
1151         }
1152
1153         if (val != panel->backlight.level && val >=0 &&
1154                         val <= max_brightness) {
1155                 intel_panel_set_backlight(arg1, val, max_brightness);
1156         }
1157
1158         return(err);
1159 }
1160 /* XXX: DragonFly-specific end */
1161
1162 int intel_panel_setup_backlight(struct drm_connector *connector)
1163 {
1164         struct drm_device *dev = connector->dev;
1165         struct drm_i915_private *dev_priv = dev->dev_private;
1166         struct intel_connector *intel_connector = to_intel_connector(connector);
1167         struct intel_panel *panel = &intel_connector->panel;
1168         int ret;
1169
1170         if (!dev_priv->vbt.backlight.present) {
1171                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1172                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1173                 } else {
1174                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1175                         return 0;
1176                 }
1177         }
1178
1179         /* set level and max in panel struct */
1180         spin_lock(&dev_priv->backlight_lock);
1181         ret = dev_priv->display.setup_backlight(intel_connector);
1182         spin_unlock(&dev_priv->backlight_lock);
1183
1184         if (ret) {
1185                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1186                               connector->name);
1187                 return ret;
1188         }
1189
1190         intel_backlight_device_register(intel_connector);
1191
1192         panel->backlight.present = true;
1193
1194         /* XXX: DragonFly-specific begin */
1195         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1196                         OID_AUTO, "backlight_max",
1197                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1198                         connector, sizeof(int),
1199                         sysctl_backlight_max,
1200                         "I", "Max backlight level");
1201         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1202                         OID_AUTO, "backlight_level",
1203                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1204                         connector, sizeof(int),
1205                         sysctl_backlight_handler,
1206                         "I", "Backlight level");
1207         /* XXX: DragonFly-specific end */
1208
1209         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1210                       "sysfs interface %sregistered\n",
1211                       panel->backlight.enabled ? "enabled" : "disabled",
1212                       panel->backlight.level, panel->backlight.max,
1213                       panel->backlight.device ? "" : "not ");
1214
1215         return 0;
1216 }
1217
1218 void intel_panel_destroy_backlight(struct drm_connector *connector)
1219 {
1220         struct intel_connector *intel_connector = to_intel_connector(connector);
1221         struct intel_panel *panel = &intel_connector->panel;
1222
1223         panel->backlight.present = false;
1224         intel_backlight_device_unregister(intel_connector);
1225 }
1226
1227 /* Set up chip specific backlight functions */
1228 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1229 {
1230         struct drm_i915_private *dev_priv = dev->dev_private;
1231
1232         if (IS_BROADWELL(dev)) {
1233                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1234                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1235                 dev_priv->display.disable_backlight = pch_disable_backlight;
1236                 dev_priv->display.set_backlight = bdw_set_backlight;
1237                 dev_priv->display.get_backlight = bdw_get_backlight;
1238         } else if (HAS_PCH_SPLIT(dev)) {
1239                 dev_priv->display.setup_backlight = pch_setup_backlight;
1240                 dev_priv->display.enable_backlight = pch_enable_backlight;
1241                 dev_priv->display.disable_backlight = pch_disable_backlight;
1242                 dev_priv->display.set_backlight = pch_set_backlight;
1243                 dev_priv->display.get_backlight = pch_get_backlight;
1244         } else if (IS_VALLEYVIEW(dev)) {
1245                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1246                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1247                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1248                 dev_priv->display.set_backlight = vlv_set_backlight;
1249                 dev_priv->display.get_backlight = vlv_get_backlight;
1250         } else if (IS_GEN4(dev)) {
1251                 dev_priv->display.setup_backlight = i965_setup_backlight;
1252                 dev_priv->display.enable_backlight = i965_enable_backlight;
1253                 dev_priv->display.disable_backlight = i965_disable_backlight;
1254                 dev_priv->display.set_backlight = i9xx_set_backlight;
1255                 dev_priv->display.get_backlight = i9xx_get_backlight;
1256         } else {
1257                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1258                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1259                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1260                 dev_priv->display.set_backlight = i9xx_set_backlight;
1261                 dev_priv->display.get_backlight = i9xx_get_backlight;
1262         }
1263 }
1264
1265 int intel_panel_init(struct intel_panel *panel,
1266                      struct drm_display_mode *fixed_mode,
1267                      struct drm_display_mode *downclock_mode)
1268 {
1269         panel->fixed_mode = fixed_mode;
1270         panel->downclock_mode = downclock_mode;
1271
1272         return 0;
1273 }
1274
1275 void intel_panel_fini(struct intel_panel *panel)
1276 {
1277         struct intel_connector *intel_connector =
1278                 container_of(panel, struct intel_connector, panel);
1279
1280         if (panel->fixed_mode)
1281                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1282
1283         if (panel->downclock_mode)
1284                 drm_mode_destroy(intel_connector->base.dev,
1285                                 panel->downclock_mode);
1286 }