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 /**
 400  * scale - scale values from one range to another
 401  *
 402  * @source_val: value in range [@source_min..@source_max]
 403  *
 404  * Return @source_val in range [@source_min..@source_max] scaled to range
 405  * [@target_min..@target_max].
 406  */
 407 static uint32_t scale(uint32_t source_val,
 408                       uint32_t source_min, uint32_t source_max,
 409                       uint32_t target_min, uint32_t target_max)
 410 {
 411         uint64_t target_val;
 412
 413         WARN_ON(source_min > source_max);
 414         WARN_ON(target_min > target_max);
 415
 416         /* defensive */
 417         source_val = clamp(source_val, source_min, source_max);
 418
 419         /* avoid overflows */
 420         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 421                         (target_max - target_min), source_max - source_min);
 422         target_val += target_min;
 423
 424         return target_val;
 425 }
 426
 427 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 428 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 429                                    u32 user_level, u32 user_max)
 430 {
 431         struct intel_panel *panel = &connector->panel;
 432
 433         return scale(user_level, 0, user_max,
 434                      panel->backlight.min, panel->backlight.max);
 435 }
 436
 437 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 438  * to [hw_min..hw_max]. */
 439 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 440                                    u32 user_level, u32 user_max)
 441 {
 442         struct intel_panel *panel = &connector->panel;
 443         u32 hw_level;
 444
 445         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 446         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 447
 448         return hw_level;
 449 }
 450
 451 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 452 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 453                                    u32 hw_level, u32 user_max)
 454 {
 455         struct intel_panel *panel = &connector->panel;
 456
 457         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 458                      0, user_max);
 459 }
 460
 461 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 462                                           u32 val)
 463 {
 464         struct drm_device *dev = connector->base.dev;
 465         struct drm_i915_private *dev_priv = dev->dev_private;
 466         struct intel_panel *panel = &connector->panel;
 467
 468         WARN_ON(panel->backlight.max == 0);
 469
 470         if (i915.invert_brightness < 0)
 471                 return val;
 472
 473         if (i915.invert_brightness > 0 ||
 474             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 475                 return panel->backlight.max - val;
 476         }
 477
 478         return val;
 479 }
 480
 481 static u32 bdw_get_backlight(struct intel_connector *connector)
 482 {
 483         struct drm_device *dev = connector->base.dev;
 484         struct drm_i915_private *dev_priv = dev->dev_private;
 485
 486         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 487 }
 488
 489 static u32 pch_get_backlight(struct intel_connector *connector)
 490 {
 491         struct drm_device *dev = connector->base.dev;
 492         struct drm_i915_private *dev_priv = dev->dev_private;
 493
 494         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 495 }
 496
 497 static u32 i9xx_get_backlight(struct intel_connector *connector)
 498 {
 499         struct drm_device *dev = connector->base.dev;
 500         struct drm_i915_private *dev_priv = dev->dev_private;
 501         struct intel_panel *panel = &connector->panel;
 502         u32 val;
 503
 504         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 505         if (INTEL_INFO(dev)->gen < 4)
 506                 val >>= 1;
 507
 508         if (panel->backlight.combination_mode) {
 509                 u8 lbpc;
 510
 511                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 512                 val *= lbpc;
 513         }
 514
 515         return val;
 516 }
 517
 518 static u32 _vlv_get_backlight(struct drm_device *dev, enum i915_pipe pipe)
 519 {
 520         struct drm_i915_private *dev_priv = dev->dev_private;
 521
 522         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 523 }
 524
 525 static u32 vlv_get_backlight(struct intel_connector *connector)
 526 {
 527         struct drm_device *dev = connector->base.dev;
 528         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 529
 530         return _vlv_get_backlight(dev, pipe);
 531 }
 532
 533 #if 0
 534 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 535 {
 536         struct drm_device *dev = connector->base.dev;
 537         struct drm_i915_private *dev_priv = dev->dev_private;
 538         u32 val;
 539         unsigned long flags;
 540
 541         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 542
 543         val = dev_priv->display.get_backlight(connector);
 544         val = intel_panel_compute_brightness(connector, val);
 545
 546         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 547
 548         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 549         return val;
 550 }
 551 #endif
 552
 553 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 554 {
 555         struct drm_device *dev = connector->base.dev;
 556         struct drm_i915_private *dev_priv = dev->dev_private;
 557         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 558         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 559 }
 560
 561 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 562 {
 563         struct drm_device *dev = connector->base.dev;
 564         struct drm_i915_private *dev_priv = dev->dev_private;
 565         u32 tmp;
 566
 567         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 568         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 569 }
 570
 571 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 572 {
 573         struct drm_device *dev = connector->base.dev;
 574         struct drm_i915_private *dev_priv = dev->dev_private;
 575         struct intel_panel *panel = &connector->panel;
 576         u32 tmp, mask;
 577
 578         WARN_ON(panel->backlight.max == 0);
 579
 580         if (panel->backlight.combination_mode) {
 581                 u8 lbpc;
 582
 583                 lbpc = level * 0xfe / panel->backlight.max + 1;
 584                 level /= lbpc;
 585                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 586         }
 587
 588         if (IS_GEN4(dev)) {
 589                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 590         } else {
 591                 level <<= 1;
 592                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 593         }
 594
 595         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 596         I915_WRITE(BLC_PWM_CTL, tmp | level);
 597 }
 598
 599 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 600 {
 601         struct drm_device *dev = connector->base.dev;
 602         struct drm_i915_private *dev_priv = dev->dev_private;
 603         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 604         u32 tmp;
 605
 606         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 607         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 608 }
 609
 610 static void
 611 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 612 {
 613         struct drm_device *dev = connector->base.dev;
 614         struct drm_i915_private *dev_priv = dev->dev_private;
 615
 616         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 617
 618         level = intel_panel_compute_brightness(connector, level);
 619         dev_priv->display.set_backlight(connector, level);
 620 }
 621
 622 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 623 static void intel_panel_set_backlight(struct intel_connector *connector,
 624                                       u32 user_level, u32 user_max)
 625 {
 626         struct drm_device *dev = connector->base.dev;
 627         struct drm_i915_private *dev_priv = dev->dev_private;
 628         struct intel_panel *panel = &connector->panel;
 629         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 630         u32 hw_level;
 631
 632         if (!panel->backlight.present || pipe == INVALID_PIPE)
 633                 return;
 634
 635         spin_lock(&dev_priv->backlight_lock);
 636
 637         WARN_ON(panel->backlight.max == 0);
 638
 639         hw_level = scale_user_to_hw(connector, user_level, user_max);
 640         panel->backlight.level = hw_level;
 641
 642         if (panel->backlight.enabled)
 643                 intel_panel_actually_set_backlight(connector, hw_level);
 644
 645         spin_unlock(&dev_priv->backlight_lock);
 646 }
 647
 648 /* set backlight brightness to level in range [0..max], assuming hw min is
 649  * respected.
 650  */
 651 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 652                                     u32 user_level, u32 user_max)
 653 {
 654         struct drm_device *dev = connector->base.dev;
 655         struct drm_i915_private *dev_priv = dev->dev_private;
 656         struct intel_panel *panel = &connector->panel;
 657         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 658         u32 hw_level;
 659
 660         if (!panel->backlight.present || pipe == INVALID_PIPE)
 661                 return;
 662
 663         spin_lock(&dev_priv->backlight_lock);
 664
 665         WARN_ON(panel->backlight.max == 0);
 666
 667         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 668         panel->backlight.level = hw_level;
 669
 670         if (panel->backlight.device)
 671                 panel->backlight.device->props.brightness =
 672                         scale_hw_to_user(connector,
 673                                          panel->backlight.level,
 674                                          panel->backlight.device->props.max_brightness);
 675
 676         if (panel->backlight.enabled)
 677                 intel_panel_actually_set_backlight(connector, hw_level);
 678
 679         spin_unlock(&dev_priv->backlight_lock);
 680 }
 681
 682 static void pch_disable_backlight(struct intel_connector *connector)
 683 {
 684         struct drm_device *dev = connector->base.dev;
 685         struct drm_i915_private *dev_priv = dev->dev_private;
 686         u32 tmp;
 687
 688         intel_panel_actually_set_backlight(connector, 0);
 689
 690         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 691         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 692
 693         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 694         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 695 }
 696
 697 static void i9xx_disable_backlight(struct intel_connector *connector)
 698 {
 699         intel_panel_actually_set_backlight(connector, 0);
 700 }
 701
 702 static void i965_disable_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         u32 tmp;
 707
 708         intel_panel_actually_set_backlight(connector, 0);
 709
 710         tmp = I915_READ(BLC_PWM_CTL2);
 711         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 712 }
 713
 714 static void vlv_disable_backlight(struct intel_connector *connector)
 715 {
 716         struct drm_device *dev = connector->base.dev;
 717         struct drm_i915_private *dev_priv = dev->dev_private;
 718         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 719         u32 tmp;
 720
 721         intel_panel_actually_set_backlight(connector, 0);
 722
 723         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 724         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 725 }
 726
 727 void intel_panel_disable_backlight(struct intel_connector *connector)
 728 {
 729         struct drm_device *dev = connector->base.dev;
 730         struct drm_i915_private *dev_priv = dev->dev_private;
 731         struct intel_panel *panel = &connector->panel;
 732         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 733
 734         if (!panel->backlight.present || pipe == INVALID_PIPE)
 735                 return;
 736
 737         /*
 738          * Do not disable backlight on the vgaswitcheroo path. When switching
 739          * away from i915, the other client may depend on i915 to handle the
 740          * backlight. This will leave the backlight on unnecessarily when
 741          * another client is not activated.
 742          */
 743         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 744                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 745                 return;
 746         }
 747
 748         spin_lock(&dev_priv->backlight_lock);
 749
 750         if (panel->backlight.device)
 751                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 752         panel->backlight.enabled = false;
 753         dev_priv->display.disable_backlight(connector);
 754
 755         spin_unlock(&dev_priv->backlight_lock);
 756 }
 757
 758 static void bdw_enable_backlight(struct intel_connector *connector)
 759 {
 760         struct drm_device *dev = connector->base.dev;
 761         struct drm_i915_private *dev_priv = dev->dev_private;
 762         struct intel_panel *panel = &connector->panel;
 763         u32 pch_ctl1, pch_ctl2;
 764
 765         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 766         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 767                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 768                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 769                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 770         }
 771
 772         pch_ctl2 = panel->backlight.max << 16;
 773         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 774
 775         pch_ctl1 = 0;
 776         if (panel->backlight.active_low_pwm)
 777                 pch_ctl1 |= BLM_PCH_POLARITY;
 778
 779         /* BDW always uses the pch pwm controls. */
 780         pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 781
 782         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 783         POSTING_READ(BLC_PWM_PCH_CTL1);
 784         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 785
 786         /* This won't stick until the above enable. */
 787         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 788 }
 789
 790 static void pch_enable_backlight(struct intel_connector *connector)
 791 {
 792         struct drm_device *dev = connector->base.dev;
 793         struct drm_i915_private *dev_priv = dev->dev_private;
 794         struct intel_panel *panel = &connector->panel;
 795         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 796         enum transcoder cpu_transcoder =
 797                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 798         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 799
 800         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 801         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 802                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 803                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 804                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 805         }
 806
 807         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 808         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 809                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 810                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 811                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 812         }
 813
 814         if (cpu_transcoder == TRANSCODER_EDP)
 815                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 816         else
 817                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 818         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 819         POSTING_READ(BLC_PWM_CPU_CTL2);
 820         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 821
 822         /* This won't stick until the above enable. */
 823         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 824
 825         pch_ctl2 = panel->backlight.max << 16;
 826         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 827
 828         pch_ctl1 = 0;
 829         if (panel->backlight.active_low_pwm)
 830                 pch_ctl1 |= BLM_PCH_POLARITY;
 831
 832         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 833         POSTING_READ(BLC_PWM_PCH_CTL1);
 834         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 835 }
 836
 837 static void i9xx_enable_backlight(struct intel_connector *connector)
 838 {
 839         struct drm_device *dev = connector->base.dev;
 840         struct drm_i915_private *dev_priv = dev->dev_private;
 841         struct intel_panel *panel = &connector->panel;
 842         u32 ctl, freq;
 843
 844         ctl = I915_READ(BLC_PWM_CTL);
 845         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 846                 DRM_DEBUG_KMS("backlight already enabled\n");
 847                 I915_WRITE(BLC_PWM_CTL, 0);
 848         }
 849
 850         freq = panel->backlight.max;
 851         if (panel->backlight.combination_mode)
 852                 freq /= 0xff;
 853
 854         ctl = freq << 17;
 855         if (panel->backlight.combination_mode)
 856                 ctl |= BLM_LEGACY_MODE;
 857         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 858                 ctl |= BLM_POLARITY_PNV;
 859
 860         I915_WRITE(BLC_PWM_CTL, ctl);
 861         POSTING_READ(BLC_PWM_CTL);
 862
 863         /* XXX: combine this into above write? */
 864         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 865 }
 866
 867 static void i965_enable_backlight(struct intel_connector *connector)
 868 {
 869         struct drm_device *dev = connector->base.dev;
 870         struct drm_i915_private *dev_priv = dev->dev_private;
 871         struct intel_panel *panel = &connector->panel;
 872         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 873         u32 ctl, ctl2, freq;
 874
 875         ctl2 = I915_READ(BLC_PWM_CTL2);
 876         if (ctl2 & BLM_PWM_ENABLE) {
 877                 DRM_DEBUG_KMS("backlight already enabled\n");
 878                 ctl2 &= ~BLM_PWM_ENABLE;
 879                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 880         }
 881
 882         freq = panel->backlight.max;
 883         if (panel->backlight.combination_mode)
 884                 freq /= 0xff;
 885
 886         ctl = freq << 16;
 887         I915_WRITE(BLC_PWM_CTL, ctl);
 888
 889         ctl2 = BLM_PIPE(pipe);
 890         if (panel->backlight.combination_mode)
 891                 ctl2 |= BLM_COMBINATION_MODE;
 892         if (panel->backlight.active_low_pwm)
 893                 ctl2 |= BLM_POLARITY_I965;
 894         I915_WRITE(BLC_PWM_CTL2, ctl2);
 895         POSTING_READ(BLC_PWM_CTL2);
 896         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 897
 898         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 899 }
 900
 901 static void vlv_enable_backlight(struct intel_connector *connector)
 902 {
 903         struct drm_device *dev = connector->base.dev;
 904         struct drm_i915_private *dev_priv = dev->dev_private;
 905         struct intel_panel *panel = &connector->panel;
 906         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 907         u32 ctl, ctl2;
 908
 909         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 910         if (ctl2 & BLM_PWM_ENABLE) {
 911                 DRM_DEBUG_KMS("backlight already enabled\n");
 912                 ctl2 &= ~BLM_PWM_ENABLE;
 913                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 914         }
 915
 916         ctl = panel->backlight.max << 16;
 917         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 918
 919         /* XXX: combine this into above write? */
 920         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 921
 922         ctl2 = 0;
 923         if (panel->backlight.active_low_pwm)
 924                 ctl2 |= BLM_POLARITY_I965;
 925         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 926         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 927         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 928 }
 929
 930 void intel_panel_enable_backlight(struct intel_connector *connector)
 931 {
 932         struct drm_device *dev = connector->base.dev;
 933         struct drm_i915_private *dev_priv = dev->dev_private;
 934         struct intel_panel *panel = &connector->panel;
 935         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 936
 937         if (!panel->backlight.present || pipe == INVALID_PIPE)
 938                 return;
 939
 940         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 941
 942         spin_lock(&dev_priv->backlight_lock);
 943
 944         WARN_ON(panel->backlight.max == 0);
 945
 946         if (panel->backlight.level == 0) {
 947                 panel->backlight.level = panel->backlight.max;
 948                 if (panel->backlight.device)
 949                         panel->backlight.device->props.brightness =
 950                                 scale_hw_to_user(connector,
 951                                                  panel->backlight.level,
 952                                                  panel->backlight.device->props.max_brightness);
 953         }
 954
 955         dev_priv->display.enable_backlight(connector);
 956         panel->backlight.enabled = true;
 957         if (panel->backlight.device)
 958                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
 959
 960         spin_unlock(&dev_priv->backlight_lock);
 961 }
 962
 963 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 964 static int intel_backlight_device_update_status(struct backlight_device *bd)
 965 {
 966         struct intel_connector *connector = bl_get_data(bd);
 967         struct intel_panel *panel = &connector->panel;
 968         struct drm_device *dev = connector->base.dev;
 969
 970         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 971         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 972                       bd->props.brightness, bd->props.max_brightness);
 973         intel_panel_set_backlight(connector, bd->props.brightness,
 974                                   bd->props.max_brightness);
 975
 976         /*
 977          * Allow flipping bl_power as a sub-state of enabled. Sadly the
 978          * backlight class device does not make it easy to to differentiate
 979          * between callbacks for brightness and bl_power, so our backlight_power
 980          * callback needs to take this into account.
 981          */
 982         if (panel->backlight.enabled) {
 983                 if (panel->backlight_power) {
 984                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
 985                                 bd->props.brightness != 0;
 986                         panel->backlight_power(connector, enable);
 987                 }
 988         } else {
 989                 bd->props.power = FB_BLANK_POWERDOWN;
 990         }
 991
 992         drm_modeset_unlock(&dev->mode_config.connection_mutex);
 993         return 0;
 994 }
 995
 996 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 997 {
 998         struct intel_connector *connector = bl_get_data(bd);
 999         struct drm_device *dev = connector->base.dev;
1000         struct drm_i915_private *dev_priv = dev->dev_private;
1001         u32 hw_level;
1002         int ret;
1003
1004         intel_runtime_pm_get(dev_priv);
1005         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1006
1007         hw_level = intel_panel_get_backlight(connector);
1008         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1009
1010         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1011         intel_runtime_pm_put(dev_priv);
1012
1013         return ret;
1014 }
1015
1016 static const struct backlight_ops intel_backlight_device_ops = {
1017         .update_status = intel_backlight_device_update_status,
1018         .get_brightness = intel_backlight_device_get_brightness,
1019 };
1020
1021 static int intel_backlight_device_register(struct intel_connector *connector)
1022 {
1023         struct intel_panel *panel = &connector->panel;
1024         struct backlight_properties props;
1025
1026         if (WARN_ON(panel->backlight.device))
1027                 return -ENODEV;
1028
1029         WARN_ON(panel->backlight.max == 0);
1030
1031         memset(&props, 0, sizeof(props));
1032         props.type = BACKLIGHT_RAW;
1033
1034         /*
1035          * Note: Everything should work even if the backlight device max
1036          * presented to the userspace is arbitrarily chosen.
1037          */
1038         props.max_brightness = panel->backlight.max;
1039         props.brightness = scale_hw_to_user(connector,
1040                                             panel->backlight.level,
1041                                             props.max_brightness);
1042
1043         if (panel->backlight.enabled)
1044                 props.power = FB_BLANK_UNBLANK;
1045         else
1046                 props.power = FB_BLANK_POWERDOWN;
1047
1048         /*
1049          * Note: using the same name independent of the connector prevents
1050          * registration of multiple backlight devices in the driver.
1051          */
1052         panel->backlight.device =
1053                 backlight_device_register("intel_backlight",
1054                                           connector->base.kdev,
1055                                           connector,
1056                                           &intel_backlight_device_ops, &props);
1057
1058         if (IS_ERR(panel->backlight.device)) {
1059                 DRM_ERROR("Failed to register backlight: %ld\n",
1060                           PTR_ERR(panel->backlight.device));
1061                 panel->backlight.device = NULL;
1062                 return -ENODEV;
1063         }
1064         return 0;
1065 }
1066
1067 static void intel_backlight_device_unregister(struct intel_connector *connector)
1068 {
1069         struct intel_panel *panel = &connector->panel;
1070
1071         if (panel->backlight.device) {
1072                 backlight_device_unregister(panel->backlight.device);
1073                 panel->backlight.device = NULL;
1074         }
1075 }
1076 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1077 static int intel_backlight_device_register(struct intel_connector *connector)
1078 {
1079         return 0;
1080 }
1081 static void intel_backlight_device_unregister(struct intel_connector *connector)
1082 {
1083 }
1084 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1085
1086 /*
1087  * Note: The setup hooks can't assume pipe is set!
1088  *
1089  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1090  * appropriately when it's 0. Use VBT and/or sane defaults.
1091  */
1092 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1093 {
1094         struct drm_device *dev = connector->base.dev;
1095         struct drm_i915_private *dev_priv = dev->dev_private;
1096         struct intel_panel *panel = &connector->panel;
1097         int min;
1098
1099         WARN_ON(panel->backlight.max == 0);
1100
1101         /*
1102          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1103          * to problems. There are such machines out there. Either our
1104          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1105          * against this by letting the minimum be at most (arbitrarily chosen)
1106          * 25% of the max.
1107          */
1108         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1109         if (min != dev_priv->vbt.backlight.min_brightness) {
1110                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1111                               dev_priv->vbt.backlight.min_brightness, min);
1112         }
1113
1114         /* vbt value is a coefficient in range [0..255] */
1115         return scale(min, 0, 255, 0, panel->backlight.max);
1116 }
1117
1118 static int bdw_setup_backlight(struct intel_connector *connector)
1119 {
1120         struct drm_device *dev = connector->base.dev;
1121         struct drm_i915_private *dev_priv = dev->dev_private;
1122         struct intel_panel *panel = &connector->panel;
1123         u32 pch_ctl1, pch_ctl2, val;
1124
1125         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1126         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1127
1128         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1129         panel->backlight.max = pch_ctl2 >> 16;
1130         if (!panel->backlight.max)
1131                 return -ENODEV;
1132
1133         panel->backlight.min = get_backlight_min_vbt(connector);
1134
1135         val = bdw_get_backlight(connector);
1136         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1137
1138         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1139                 panel->backlight.level != 0;
1140
1141         return 0;
1142 }
1143
1144 static int pch_setup_backlight(struct intel_connector *connector)
1145 {
1146         struct drm_device *dev = connector->base.dev;
1147         struct drm_i915_private *dev_priv = dev->dev_private;
1148         struct intel_panel *panel = &connector->panel;
1149         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1150
1151         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1152         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1153
1154         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1155         panel->backlight.max = pch_ctl2 >> 16;
1156         if (!panel->backlight.max)
1157                 return -ENODEV;
1158
1159         panel->backlight.min = get_backlight_min_vbt(connector);
1160
1161         val = pch_get_backlight(connector);
1162         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1163
1164         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1165         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1166                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1167
1168         return 0;
1169 }
1170
1171 static int i9xx_setup_backlight(struct intel_connector *connector)
1172 {
1173         struct drm_device *dev = connector->base.dev;
1174         struct drm_i915_private *dev_priv = dev->dev_private;
1175         struct intel_panel *panel = &connector->panel;
1176         u32 ctl, val;
1177
1178         ctl = I915_READ(BLC_PWM_CTL);
1179
1180         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1181                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1182
1183         if (IS_PINEVIEW(dev))
1184                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1185
1186         panel->backlight.max = ctl >> 17;
1187         if (panel->backlight.combination_mode)
1188                 panel->backlight.max *= 0xff;
1189
1190         if (!panel->backlight.max)
1191                 return -ENODEV;
1192
1193         panel->backlight.min = get_backlight_min_vbt(connector);
1194
1195         val = i9xx_get_backlight(connector);
1196         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1197
1198         panel->backlight.enabled = panel->backlight.level != 0;
1199
1200         return 0;
1201 }
1202
1203 static int i965_setup_backlight(struct intel_connector *connector)
1204 {
1205         struct drm_device *dev = connector->base.dev;
1206         struct drm_i915_private *dev_priv = dev->dev_private;
1207         struct intel_panel *panel = &connector->panel;
1208         u32 ctl, ctl2, val;
1209
1210         ctl2 = I915_READ(BLC_PWM_CTL2);
1211         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1212         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1213
1214         ctl = I915_READ(BLC_PWM_CTL);
1215         panel->backlight.max = ctl >> 16;
1216         if (panel->backlight.combination_mode)
1217                 panel->backlight.max *= 0xff;
1218
1219         if (!panel->backlight.max)
1220                 return -ENODEV;
1221
1222         panel->backlight.min = get_backlight_min_vbt(connector);
1223
1224         val = i9xx_get_backlight(connector);
1225         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1226
1227         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1228                 panel->backlight.level != 0;
1229
1230         return 0;
1231 }
1232
1233 static int vlv_setup_backlight(struct intel_connector *connector)
1234 {
1235         struct drm_device *dev = connector->base.dev;
1236         struct drm_i915_private *dev_priv = dev->dev_private;
1237         struct intel_panel *panel = &connector->panel;
1238         enum i915_pipe pipe;
1239         u32 ctl, ctl2, val;
1240
1241         for_each_pipe(dev_priv, pipe) {
1242                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1243
1244                 /* Skip if the modulation freq is already set */
1245                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1246                         continue;
1247
1248                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1249                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1250                            cur_val);
1251         }
1252
1253         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
1254         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1255
1256         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
1257         panel->backlight.max = ctl >> 16;
1258         if (!panel->backlight.max)
1259                 return -ENODEV;
1260
1261         panel->backlight.min = get_backlight_min_vbt(connector);
1262
1263         val = _vlv_get_backlight(dev, PIPE_A);
1264         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1265
1266         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1267                 panel->backlight.level != 0;
1268
1269         return 0;
1270 }
1271
1272 #ifdef __DragonFly__
1273 /*
1274  * Read max backlight level
1275  */
1276 static int
1277 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1278 {
1279         int err, val;
1280         struct intel_connector *connector = arg1;
1281         struct drm_device *dev = connector->base.dev;
1282         struct drm_i915_private *dev_priv = dev->dev_private;
1283         struct intel_panel *panel = &connector->panel;
1284
1285         spin_lock(&dev_priv->backlight_lock);
1286         val = panel->backlight.max;
1287         spin_unlock(&dev_priv->backlight_lock);
1288
1289         err = sysctl_handle_int(oidp, &val, 0, req);
1290         return(err);
1291 }
1292
1293 /*
1294  * Read/write backlight level
1295  */
1296 static int
1297 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1298 {
1299         struct intel_connector *connector = arg1;
1300         struct drm_device *dev = connector->base.dev;
1301         struct drm_i915_private *dev_priv = dev->dev_private;
1302         struct intel_panel *panel = &connector->panel;
1303         int err, val;
1304         u32 max_brightness;
1305
1306         val = panel->backlight.level;
1307
1308         spin_lock(&dev_priv->backlight_lock);
1309         max_brightness = panel->backlight.max;
1310         spin_unlock(&dev_priv->backlight_lock);
1311
1312         err = sysctl_handle_int(oidp, &val, 0, req);
1313         if (err != 0 || req->newptr == NULL) {
1314                 return(err);
1315         }
1316
1317         if (val != panel->backlight.level && val >=0 &&
1318                         val <= max_brightness) {
1319                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1320                 intel_panel_set_backlight(arg1, val, max_brightness);
1321                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1322         }
1323
1324         return(err);
1325 }
1326 #endif /* __DragonFly__ */
1327
1328 int intel_panel_setup_backlight(struct drm_connector *connector)
1329 {
1330         struct drm_device *dev = connector->dev;
1331         struct drm_i915_private *dev_priv = dev->dev_private;
1332         struct intel_connector *intel_connector = to_intel_connector(connector);
1333         struct intel_panel *panel = &intel_connector->panel;
1334         int ret;
1335
1336         if (!dev_priv->vbt.backlight.present) {
1337                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1338                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1339                 } else {
1340                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1341                         return 0;
1342                 }
1343         }
1344
1345         /* set level and max in panel struct */
1346         spin_lock(&dev_priv->backlight_lock);
1347         ret = dev_priv->display.setup_backlight(intel_connector);
1348         spin_unlock(&dev_priv->backlight_lock);
1349
1350         if (ret) {
1351                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1352                               connector->name);
1353                 return ret;
1354         }
1355
1356         intel_backlight_device_register(intel_connector);
1357
1358         panel->backlight.present = true;
1359
1360 #ifdef __DragonFly__
1361         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1362                         OID_AUTO, "backlight_max",
1363                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1364                         connector, sizeof(int),
1365                         sysctl_backlight_max,
1366                         "I", "Max backlight level");
1367         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1368                         OID_AUTO, "backlight_level",
1369                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1370                         connector, sizeof(int),
1371                         sysctl_backlight_handler,
1372                         "I", "Backlight level");
1373 #endif
1374
1375         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1376                       "sysfs interface %sregistered\n",
1377                       panel->backlight.enabled ? "enabled" : "disabled",
1378                       panel->backlight.level, panel->backlight.max,
1379                       panel->backlight.device ? "" : "not ");
1380
1381         return 0;
1382 }
1383
1384 void intel_panel_destroy_backlight(struct drm_connector *connector)
1385 {
1386         struct intel_connector *intel_connector = to_intel_connector(connector);
1387         struct intel_panel *panel = &intel_connector->panel;
1388
1389         panel->backlight.present = false;
1390         intel_backlight_device_unregister(intel_connector);
1391 }
1392
1393 /* Set up chip specific backlight functions */
1394 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1395 {
1396         struct drm_i915_private *dev_priv = dev->dev_private;
1397
1398         if (IS_BROADWELL(dev)) {
1399                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1400                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1401                 dev_priv->display.disable_backlight = pch_disable_backlight;
1402                 dev_priv->display.set_backlight = bdw_set_backlight;
1403                 dev_priv->display.get_backlight = bdw_get_backlight;
1404         } else if (HAS_PCH_SPLIT(dev)) {
1405                 dev_priv->display.setup_backlight = pch_setup_backlight;
1406                 dev_priv->display.enable_backlight = pch_enable_backlight;
1407                 dev_priv->display.disable_backlight = pch_disable_backlight;
1408                 dev_priv->display.set_backlight = pch_set_backlight;
1409                 dev_priv->display.get_backlight = pch_get_backlight;
1410         } else if (IS_VALLEYVIEW(dev)) {
1411                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1412                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1413                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1414                 dev_priv->display.set_backlight = vlv_set_backlight;
1415                 dev_priv->display.get_backlight = vlv_get_backlight;
1416         } else if (IS_GEN4(dev)) {
1417                 dev_priv->display.setup_backlight = i965_setup_backlight;
1418                 dev_priv->display.enable_backlight = i965_enable_backlight;
1419                 dev_priv->display.disable_backlight = i965_disable_backlight;
1420                 dev_priv->display.set_backlight = i9xx_set_backlight;
1421                 dev_priv->display.get_backlight = i9xx_get_backlight;
1422         } else {
1423                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1424                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1425                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1426                 dev_priv->display.set_backlight = i9xx_set_backlight;
1427                 dev_priv->display.get_backlight = i9xx_get_backlight;
1428         }
1429 }
1430
1431 int intel_panel_init(struct intel_panel *panel,
1432                      struct drm_display_mode *fixed_mode,
1433                      struct drm_display_mode *downclock_mode)
1434 {
1435         panel->fixed_mode = fixed_mode;
1436         panel->downclock_mode = downclock_mode;
1437
1438         return 0;
1439 }
1440
1441 void intel_panel_fini(struct intel_panel *panel)
1442 {
1443         struct intel_connector *intel_connector =
1444                 container_of(panel, struct intel_connector, panel);
1445
1446         if (panel->fixed_mode)
1447                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1448
1449         if (panel->downclock_mode)
1450                 drm_mode_destroy(intel_connector->base.dev,
1451                                 panel->downclock_mode);
1452 }