drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/moduleparam.h>
  34 #include "intel_drv.h"
  35
  36 void
  37 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  38                        struct drm_display_mode *adjusted_mode)
  39 {
  40         drm_mode_copy(adjusted_mode, fixed_mode);
  41
  42         drm_mode_set_crtcinfo(adjusted_mode, 0);
  43 }
  44
  45 /**
  46  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  47  * @dev: drm device
  48  * @fixed_mode : panel native mode
  49  * @connector: LVDS/eDP connector
  50  *
  51  * Return downclock_avail
  52  * Find the reduced downclock for LVDS/eDP in EDID.
  53  */
  54 struct drm_display_mode *
  55 intel_find_panel_downclock(struct drm_device *dev,
  56                         struct drm_display_mode *fixed_mode,
  57                         struct drm_connector *connector)
  58 {
  59         struct drm_display_mode *scan, *tmp_mode;
  60         int temp_downclock;
  61
  62         temp_downclock = fixed_mode->clock;
  63         tmp_mode = NULL;
  64
  65         list_for_each_entry(scan, &connector->probed_modes, head) {
  66                 /*
  67                  * If one mode has the same resolution with the fixed_panel
  68                  * mode while they have the different refresh rate, it means
  69                  * that the reduced downclock is found. In such
  70                  * case we can set the different FPx0/1 to dynamically select
  71                  * between low and high frequency.
  72                  */
  73                 if (scan->hdisplay == fixed_mode->hdisplay &&
  74                     scan->hsync_start == fixed_mode->hsync_start &&
  75                     scan->hsync_end == fixed_mode->hsync_end &&
  76                     scan->htotal == fixed_mode->htotal &&
  77                     scan->vdisplay == fixed_mode->vdisplay &&
  78                     scan->vsync_start == fixed_mode->vsync_start &&
  79                     scan->vsync_end == fixed_mode->vsync_end &&
  80                     scan->vtotal == fixed_mode->vtotal) {
  81                         if (scan->clock < temp_downclock) {
  82                                 /*
  83                                  * The downclock is already found. But we
  84                                  * expect to find the lower downclock.
  85                                  */
  86                                 temp_downclock = scan->clock;
  87                                 tmp_mode = scan;
  88                         }
  89                 }
  90         }
  91
  92         if (temp_downclock < fixed_mode->clock)
  93                 return drm_mode_duplicate(dev, tmp_mode);
  94         else
  95                 return NULL;
  96 }
  97
  98 /* adjusted_mode has been preset to be the panel's fixed mode */
  99 void
 100 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 101                         struct intel_crtc_config *pipe_config,
 102                         int fitting_mode)
 103 {
 104         struct drm_display_mode *adjusted_mode;
 105         int x, y, width, height;
 106
 107         adjusted_mode = &pipe_config->adjusted_mode;
 108
 109         x = y = width = height = 0;
 110
 111         /* Native modes don't need fitting */
 112         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 113             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 114                 goto done;
 115
 116         switch (fitting_mode) {
 117         case DRM_MODE_SCALE_CENTER:
 118                 width = pipe_config->pipe_src_w;
 119                 height = pipe_config->pipe_src_h;
 120                 x = (adjusted_mode->hdisplay - width + 1)/2;
 121                 y = (adjusted_mode->vdisplay - height + 1)/2;
 122                 break;
 123
 124         case DRM_MODE_SCALE_ASPECT:
 125                 /* Scale but preserve the aspect ratio */
 126                 {
 127                         u32 scaled_width = adjusted_mode->hdisplay
 128                                 * pipe_config->pipe_src_h;
 129                         u32 scaled_height = pipe_config->pipe_src_w
 130                                 * adjusted_mode->vdisplay;
 131                         if (scaled_width > scaled_height) { /* pillar */
 132                                 width = scaled_height / pipe_config->pipe_src_h;
 133                                 if (width & 1)
 134                                         width++;
 135                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
 136                                 y = 0;
 137                                 height = adjusted_mode->vdisplay;
 138                         } else if (scaled_width < scaled_height) { /* letter */
 139                                 height = scaled_width / pipe_config->pipe_src_w;
 140                                 if (height & 1)
 141                                     height++;
 142                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
 143                                 x = 0;
 144                                 width = adjusted_mode->hdisplay;
 145                         } else {
 146                                 x = y = 0;
 147                                 width = adjusted_mode->hdisplay;
 148                                 height = adjusted_mode->vdisplay;
 149                         }
 150                 }
 151                 break;
 152
 153         case DRM_MODE_SCALE_FULLSCREEN:
 154                 x = y = 0;
 155                 width = adjusted_mode->hdisplay;
 156                 height = adjusted_mode->vdisplay;
 157                 break;
 158
 159         default:
 160                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 161                 return;
 162         }
 163
 164 done:
 165         pipe_config->pch_pfit.pos = (x << 16) | y;
 166         pipe_config->pch_pfit.size = (width << 16) | height;
 167         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 168 }
 169
 170 static void
 171 centre_horizontally(struct drm_display_mode *mode,
 172                     int width)
 173 {
 174         u32 border, sync_pos, blank_width, sync_width;
 175
 176         /* keep the hsync and hblank widths constant */
 177         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 178         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 179         sync_pos = (blank_width - sync_width + 1) / 2;
 180
 181         border = (mode->hdisplay - width + 1) / 2;
 182         border += border & 1; /* make the border even */
 183
 184         mode->crtc_hdisplay = width;
 185         mode->crtc_hblank_start = width + border;
 186         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 187
 188         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 189         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 190 }
 191
 192 static void
 193 centre_vertically(struct drm_display_mode *mode,
 194                   int height)
 195 {
 196         u32 border, sync_pos, blank_width, sync_width;
 197
 198         /* keep the vsync and vblank widths constant */
 199         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 200         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 201         sync_pos = (blank_width - sync_width + 1) / 2;
 202
 203         border = (mode->vdisplay - height + 1) / 2;
 204
 205         mode->crtc_vdisplay = height;
 206         mode->crtc_vblank_start = height + border;
 207         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 208
 209         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 210         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 211 }
 212
 213 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 214 {
 215         /*
 216          * Floating point operation is not supported. So the FACTOR
 217          * is defined, which can avoid the floating point computation
 218          * when calculating the panel ratio.
 219          */
 220 #define ACCURACY 12
 221 #define FACTOR (1 << ACCURACY)
 222         u32 ratio = source * FACTOR / target;
 223         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 224 }
 225
 226 static void i965_scale_aspect(struct intel_crtc_config *pipe_config,
 227                               u32 *pfit_control)
 228 {
 229         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 230         u32 scaled_width = adjusted_mode->hdisplay *
 231                 pipe_config->pipe_src_h;
 232         u32 scaled_height = pipe_config->pipe_src_w *
 233                 adjusted_mode->vdisplay;
 234
 235         /* 965+ is easy, it does everything in hw */
 236         if (scaled_width > scaled_height)
 237                 *pfit_control |= PFIT_ENABLE |
 238                         PFIT_SCALING_PILLAR;
 239         else if (scaled_width < scaled_height)
 240                 *pfit_control |= PFIT_ENABLE |
 241                         PFIT_SCALING_LETTER;
 242         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 243                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 244 }
 245
 246 static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config,
 247                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 248                               u32 *border)
 249 {
 250         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 251         u32 scaled_width = adjusted_mode->hdisplay *
 252                 pipe_config->pipe_src_h;
 253         u32 scaled_height = pipe_config->pipe_src_w *
 254                 adjusted_mode->vdisplay;
 255         u32 bits;
 256
 257         /*
 258          * For earlier chips we have to calculate the scaling
 259          * ratio by hand and program it into the
 260          * PFIT_PGM_RATIO register
 261          */
 262         if (scaled_width > scaled_height) { /* pillar */
 263                 centre_horizontally(adjusted_mode,
 264                                     scaled_height /
 265                                     pipe_config->pipe_src_h);
 266
 267                 *border = LVDS_BORDER_ENABLE;
 268                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 269                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 270                                                     adjusted_mode->vdisplay);
 271
 272                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 273                                              bits << PFIT_VERT_SCALE_SHIFT);
 274                         *pfit_control |= (PFIT_ENABLE |
 275                                           VERT_INTERP_BILINEAR |
 276                                           HORIZ_INTERP_BILINEAR);
 277                 }
 278         } else if (scaled_width < scaled_height) { /* letter */
 279                 centre_vertically(adjusted_mode,
 280                                   scaled_width /
 281                                   pipe_config->pipe_src_w);
 282
 283                 *border = LVDS_BORDER_ENABLE;
 284                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 285                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 286                                                     adjusted_mode->hdisplay);
 287
 288                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 289                                              bits << PFIT_VERT_SCALE_SHIFT);
 290                         *pfit_control |= (PFIT_ENABLE |
 291                                           VERT_INTERP_BILINEAR |
 292                                           HORIZ_INTERP_BILINEAR);
 293                 }
 294         } else {
 295                 /* Aspects match, Let hw scale both directions */
 296                 *pfit_control |= (PFIT_ENABLE |
 297                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 298                                   VERT_INTERP_BILINEAR |
 299                                   HORIZ_INTERP_BILINEAR);
 300         }
 301 }
 302
 303 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 304                               struct intel_crtc_config *pipe_config,
 305                               int fitting_mode)
 306 {
 307         struct drm_device *dev = intel_crtc->base.dev;
 308         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 309         struct drm_display_mode *adjusted_mode;
 310
 311         adjusted_mode = &pipe_config->adjusted_mode;
 312
 313         /* Native modes don't need fitting */
 314         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 315             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 316                 goto out;
 317
 318         switch (fitting_mode) {
 319         case DRM_MODE_SCALE_CENTER:
 320                 /*
 321                  * For centered modes, we have to calculate border widths &
 322                  * heights and modify the values programmed into the CRTC.
 323                  */
 324                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 325                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 326                 border = LVDS_BORDER_ENABLE;
 327                 break;
 328         case DRM_MODE_SCALE_ASPECT:
 329                 /* Scale but preserve the aspect ratio */
 330                 if (INTEL_INFO(dev)->gen >= 4)
 331                         i965_scale_aspect(pipe_config, &pfit_control);
 332                 else
 333                         i9xx_scale_aspect(pipe_config, &pfit_control,
 334                                           &pfit_pgm_ratios, &border);
 335                 break;
 336         case DRM_MODE_SCALE_FULLSCREEN:
 337                 /*
 338                  * Full scaling, even if it changes the aspect ratio.
 339                  * Fortunately this is all done for us in hw.
 340                  */
 341                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 342                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 343                         pfit_control |= PFIT_ENABLE;
 344                         if (INTEL_INFO(dev)->gen >= 4)
 345                                 pfit_control |= PFIT_SCALING_AUTO;
 346                         else
 347                                 pfit_control |= (VERT_AUTO_SCALE |
 348                                                  VERT_INTERP_BILINEAR |
 349                                                  HORIZ_AUTO_SCALE |
 350                                                  HORIZ_INTERP_BILINEAR);
 351                 }
 352                 break;
 353         default:
 354                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 355                 return;
 356         }
 357
 358         /* 965+ wants fuzzy fitting */
 359         /* FIXME: handle multiple panels by failing gracefully */
 360         if (INTEL_INFO(dev)->gen >= 4)
 361                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 362                                  PFIT_FILTER_FUZZY);
 363
 364 out:
 365         if ((pfit_control & PFIT_ENABLE) == 0) {
 366                 pfit_control = 0;
 367                 pfit_pgm_ratios = 0;
 368         }
 369
 370         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 371         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 372                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 373
 374         pipe_config->gmch_pfit.control = pfit_control;
 375         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 376         pipe_config->gmch_pfit.lvds_border_bits = border;
 377 }
 378
 379 enum drm_connector_status
 380 intel_panel_detect(struct drm_device *dev)
 381 {
 382         struct drm_i915_private *dev_priv = dev->dev_private;
 383
 384         /* Assume that the BIOS does not lie through the OpRegion... */
 385         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 386                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 387                         connector_status_connected :
 388                         connector_status_disconnected;
 389         }
 390
 391         switch (i915.panel_ignore_lid) {
 392         case -2:
 393                 return connector_status_connected;
 394         case -1:
 395                 return connector_status_disconnected;
 396         default:
 397                 return connector_status_unknown;
 398         }
 399 }
 400
 401 #define DIV_ROUND_CLOSEST_ULL(ll, d)    \
 402 ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; })
 403
 404 /**
 405  * scale - scale values from one range to another
 406  *
 407  * @source_val: value in range [@source_min..@source_max]
 408  *
 409  * Return @source_val in range [@source_min..@source_max] scaled to range
 410  * [@target_min..@target_max].
 411  */
 412 static uint32_t scale(uint32_t source_val,
 413                       uint32_t source_min, uint32_t source_max,
 414                       uint32_t target_min, uint32_t target_max)
 415 {
 416         uint64_t target_val;
 417
 418         WARN_ON(source_min > source_max);
 419         WARN_ON(target_min > target_max);
 420
 421         /* defensive */
 422         source_val = clamp(source_val, source_min, source_max);
 423
 424         /* avoid overflows */
 425         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 426                         (target_max - target_min), source_max - source_min);
 427         target_val += target_min;
 428
 429         return target_val;
 430 }
 431
 432 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 433 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 434                                    u32 user_level, u32 user_max)
 435 {
 436         struct intel_panel *panel = &connector->panel;
 437
 438         return scale(user_level, 0, user_max,
 439                      panel->backlight.min, panel->backlight.max);
 440 }
 441
 442 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 443  * to [hw_min..hw_max]. */
 444 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 445                                    u32 user_level, u32 user_max)
 446 {
 447         struct intel_panel *panel = &connector->panel;
 448         u32 hw_level;
 449
 450         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 451         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 452
 453         return hw_level;
 454 }
 455
 456 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 457 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 458                                    u32 hw_level, u32 user_max)
 459 {
 460         struct intel_panel *panel = &connector->panel;
 461
 462         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 463                      0, user_max);
 464 }
 465
 466 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 467                                           u32 val)
 468 {
 469         struct drm_device *dev = connector->base.dev;
 470         struct drm_i915_private *dev_priv = dev->dev_private;
 471         struct intel_panel *panel = &connector->panel;
 472
 473         WARN_ON(panel->backlight.max == 0);
 474
 475         if (i915.invert_brightness < 0)
 476                 return val;
 477
 478         if (i915.invert_brightness > 0 ||
 479             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 480                 return panel->backlight.max - val;
 481         }
 482
 483         return val;
 484 }
 485
 486 static u32 bdw_get_backlight(struct intel_connector *connector)
 487 {
 488         struct drm_device *dev = connector->base.dev;
 489         struct drm_i915_private *dev_priv = dev->dev_private;
 490
 491         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 492 }
 493
 494 static u32 pch_get_backlight(struct intel_connector *connector)
 495 {
 496         struct drm_device *dev = connector->base.dev;
 497         struct drm_i915_private *dev_priv = dev->dev_private;
 498
 499         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 500 }
 501
 502 static u32 i9xx_get_backlight(struct intel_connector *connector)
 503 {
 504         struct drm_device *dev = connector->base.dev;
 505         struct drm_i915_private *dev_priv = dev->dev_private;
 506         struct intel_panel *panel = &connector->panel;
 507         u32 val;
 508
 509         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 510         if (INTEL_INFO(dev)->gen < 4)
 511                 val >>= 1;
 512
 513         if (panel->backlight.combination_mode) {
 514                 u8 lbpc;
 515
 516                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 517                 val *= lbpc;
 518         }
 519
 520         return val;
 521 }
 522
 523 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 524 {
 525         struct drm_i915_private *dev_priv = dev->dev_private;
 526
 527         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 528 }
 529
 530 static u32 vlv_get_backlight(struct intel_connector *connector)
 531 {
 532         struct drm_device *dev = connector->base.dev;
 533         enum pipe pipe = intel_get_pipe_from_connector(connector);
 534
 535         return _vlv_get_backlight(dev, pipe);
 536 }
 537
 538 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 539 {
 540         struct drm_device *dev = connector->base.dev;
 541         struct drm_i915_private *dev_priv = dev->dev_private;
 542         u32 val;
 543         unsigned long flags;
 544
 545         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 546
 547         val = dev_priv->display.get_backlight(connector);
 548         val = intel_panel_compute_brightness(connector, val);
 549
 550         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 551
 552         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 553         return val;
 554 }
 555
 556 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 557 {
 558         struct drm_device *dev = connector->base.dev;
 559         struct drm_i915_private *dev_priv = dev->dev_private;
 560         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 561         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 562 }
 563
 564 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 565 {
 566         struct drm_device *dev = connector->base.dev;
 567         struct drm_i915_private *dev_priv = dev->dev_private;
 568         u32 tmp;
 569
 570         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 571         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 572 }
 573
 574 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 575 {
 576         struct drm_device *dev = connector->base.dev;
 577         struct drm_i915_private *dev_priv = dev->dev_private;
 578         struct intel_panel *panel = &connector->panel;
 579         u32 tmp, mask;
 580
 581         WARN_ON(panel->backlight.max == 0);
 582
 583         if (panel->backlight.combination_mode) {
 584                 u8 lbpc;
 585
 586                 lbpc = level * 0xfe / panel->backlight.max + 1;
 587                 level /= lbpc;
 588                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 589         }
 590
 591         if (IS_GEN4(dev)) {
 592                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 593         } else {
 594                 level <<= 1;
 595                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 596         }
 597
 598         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 599         I915_WRITE(BLC_PWM_CTL, tmp | level);
 600 }
 601
 602 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 603 {
 604         struct drm_device *dev = connector->base.dev;
 605         struct drm_i915_private *dev_priv = dev->dev_private;
 606         enum pipe pipe = intel_get_pipe_from_connector(connector);
 607         u32 tmp;
 608
 609         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 610         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 611 }
 612
 613 static void
 614 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 615 {
 616         struct drm_device *dev = connector->base.dev;
 617         struct drm_i915_private *dev_priv = dev->dev_private;
 618
 619         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 620
 621         level = intel_panel_compute_brightness(connector, level);
 622         dev_priv->display.set_backlight(connector, level);
 623 }
 624
 625 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 626 static void intel_panel_set_backlight(struct intel_connector *connector,
 627                                       u32 user_level, u32 user_max)
 628 {
 629         struct drm_device *dev = connector->base.dev;
 630         struct drm_i915_private *dev_priv = dev->dev_private;
 631         struct intel_panel *panel = &connector->panel;
 632         enum pipe pipe = intel_get_pipe_from_connector(connector);
 633         u32 hw_level;
 634         unsigned long flags;
 635
 636         if (!panel->backlight.present || pipe == INVALID_PIPE)
 637                 return;
 638
 639         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 640
 641         WARN_ON(panel->backlight.max == 0);
 642
 643         hw_level = scale_user_to_hw(connector, user_level, user_max);
 644         panel->backlight.level = hw_level;
 645
 646         if (panel->backlight.enabled)
 647                 intel_panel_actually_set_backlight(connector, hw_level);
 648
 649         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 650 }
 651
 652 /* set backlight brightness to level in range [0..max], assuming hw min is
 653  * respected.
 654  */
 655 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 656                                     u32 user_level, u32 user_max)
 657 {
 658         struct drm_device *dev = connector->base.dev;
 659         struct drm_i915_private *dev_priv = dev->dev_private;
 660         struct intel_panel *panel = &connector->panel;
 661         enum pipe pipe = intel_get_pipe_from_connector(connector);
 662         u32 hw_level;
 663         unsigned long flags;
 664
 665         if (!panel->backlight.present || pipe == INVALID_PIPE)
 666                 return;
 667
 668         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 669
 670         WARN_ON(panel->backlight.max == 0);
 671
 672         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 673         panel->backlight.level = hw_level;
 674
 675         if (panel->backlight.device)
 676                 panel->backlight.device->props.brightness =
 677                         scale_hw_to_user(connector,
 678                                          panel->backlight.level,
 679                                          panel->backlight.device->props.max_brightness);
 680
 681         if (panel->backlight.enabled)
 682                 intel_panel_actually_set_backlight(connector, hw_level);
 683
 684         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 685 }
 686
 687 static void pch_disable_backlight(struct intel_connector *connector)
 688 {
 689         struct drm_device *dev = connector->base.dev;
 690         struct drm_i915_private *dev_priv = dev->dev_private;
 691         u32 tmp;
 692
 693         intel_panel_actually_set_backlight(connector, 0);
 694
 695         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 696         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 697
 698         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 699         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 700 }
 701
 702 static void i9xx_disable_backlight(struct intel_connector *connector)
 703 {
 704         intel_panel_actually_set_backlight(connector, 0);
 705 }
 706
 707 static void i965_disable_backlight(struct intel_connector *connector)
 708 {
 709         struct drm_device *dev = connector->base.dev;
 710         struct drm_i915_private *dev_priv = dev->dev_private;
 711         u32 tmp;
 712
 713         intel_panel_actually_set_backlight(connector, 0);
 714
 715         tmp = I915_READ(BLC_PWM_CTL2);
 716         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 717 }
 718
 719 static void vlv_disable_backlight(struct intel_connector *connector)
 720 {
 721         struct drm_device *dev = connector->base.dev;
 722         struct drm_i915_private *dev_priv = dev->dev_private;
 723         enum pipe pipe = intel_get_pipe_from_connector(connector);
 724         u32 tmp;
 725
 726         intel_panel_actually_set_backlight(connector, 0);
 727
 728         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 729         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 730 }
 731
 732 void intel_panel_disable_backlight(struct intel_connector *connector)
 733 {
 734         struct drm_device *dev = connector->base.dev;
 735         struct drm_i915_private *dev_priv = dev->dev_private;
 736         struct intel_panel *panel = &connector->panel;
 737         enum pipe pipe = intel_get_pipe_from_connector(connector);
 738         unsigned long flags;
 739
 740         if (!panel->backlight.present || pipe == INVALID_PIPE)
 741                 return;
 742
 743         /*
 744          * Do not disable backlight on the vgaswitcheroo path. When switching
 745          * away from i915, the other client may depend on i915 to handle the
 746          * backlight. This will leave the backlight on unnecessarily when
 747          * another client is not activated.
 748          */
 749         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 750                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 751                 return;
 752         }
 753
 754         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 755
 756         if (panel->backlight.device)
 757                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 758         panel->backlight.enabled = false;
 759         dev_priv->display.disable_backlight(connector);
 760
 761         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 762 }
 763
 764 static void bdw_enable_backlight(struct intel_connector *connector)
 765 {
 766         struct drm_device *dev = connector->base.dev;
 767         struct drm_i915_private *dev_priv = dev->dev_private;
 768         struct intel_panel *panel = &connector->panel;
 769         u32 pch_ctl1, pch_ctl2;
 770
 771         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 772         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 773                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 774                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 775                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 776         }
 777
 778         pch_ctl2 = panel->backlight.max << 16;
 779         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 780
 781         pch_ctl1 = 0;
 782         if (panel->backlight.active_low_pwm)
 783                 pch_ctl1 |= BLM_PCH_POLARITY;
 784
 785         /* BDW always uses the pch pwm controls. */
 786         pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 787
 788         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 789         POSTING_READ(BLC_PWM_PCH_CTL1);
 790         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 791
 792         /* This won't stick until the above enable. */
 793         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 794 }
 795
 796 static void pch_enable_backlight(struct intel_connector *connector)
 797 {
 798         struct drm_device *dev = connector->base.dev;
 799         struct drm_i915_private *dev_priv = dev->dev_private;
 800         struct intel_panel *panel = &connector->panel;
 801         enum pipe pipe = intel_get_pipe_from_connector(connector);
 802         enum transcoder cpu_transcoder =
 803                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 804         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 805
 806         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 807         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 808                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 809                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 810                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 811         }
 812
 813         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 814         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 815                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 816                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 817                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 818         }
 819
 820         if (cpu_transcoder == TRANSCODER_EDP)
 821                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 822         else
 823                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 824         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 825         POSTING_READ(BLC_PWM_CPU_CTL2);
 826         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 827
 828         /* This won't stick until the above enable. */
 829         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 830
 831         pch_ctl2 = panel->backlight.max << 16;
 832         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 833
 834         pch_ctl1 = 0;
 835         if (panel->backlight.active_low_pwm)
 836                 pch_ctl1 |= BLM_PCH_POLARITY;
 837
 838         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 839         POSTING_READ(BLC_PWM_PCH_CTL1);
 840         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 841 }
 842
 843 static void i9xx_enable_backlight(struct intel_connector *connector)
 844 {
 845         struct drm_device *dev = connector->base.dev;
 846         struct drm_i915_private *dev_priv = dev->dev_private;
 847         struct intel_panel *panel = &connector->panel;
 848         u32 ctl, freq;
 849
 850         ctl = I915_READ(BLC_PWM_CTL);
 851         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 852                 DRM_DEBUG_KMS("backlight already enabled\n");
 853                 I915_WRITE(BLC_PWM_CTL, 0);
 854         }
 855
 856         freq = panel->backlight.max;
 857         if (panel->backlight.combination_mode)
 858                 freq /= 0xff;
 859
 860         ctl = freq << 17;
 861         if (panel->backlight.combination_mode)
 862                 ctl |= BLM_LEGACY_MODE;
 863         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 864                 ctl |= BLM_POLARITY_PNV;
 865
 866         I915_WRITE(BLC_PWM_CTL, ctl);
 867         POSTING_READ(BLC_PWM_CTL);
 868
 869         /* XXX: combine this into above write? */
 870         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 871 }
 872
 873 static void i965_enable_backlight(struct intel_connector *connector)
 874 {
 875         struct drm_device *dev = connector->base.dev;
 876         struct drm_i915_private *dev_priv = dev->dev_private;
 877         struct intel_panel *panel = &connector->panel;
 878         enum pipe pipe = intel_get_pipe_from_connector(connector);
 879         u32 ctl, ctl2, freq;
 880
 881         ctl2 = I915_READ(BLC_PWM_CTL2);
 882         if (ctl2 & BLM_PWM_ENABLE) {
 883                 DRM_DEBUG_KMS("backlight already enabled\n");
 884                 ctl2 &= ~BLM_PWM_ENABLE;
 885                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 886         }
 887
 888         freq = panel->backlight.max;
 889         if (panel->backlight.combination_mode)
 890                 freq /= 0xff;
 891
 892         ctl = freq << 16;
 893         I915_WRITE(BLC_PWM_CTL, ctl);
 894
 895         ctl2 = BLM_PIPE(pipe);
 896         if (panel->backlight.combination_mode)
 897                 ctl2 |= BLM_COMBINATION_MODE;
 898         if (panel->backlight.active_low_pwm)
 899                 ctl2 |= BLM_POLARITY_I965;
 900         I915_WRITE(BLC_PWM_CTL2, ctl2);
 901         POSTING_READ(BLC_PWM_CTL2);
 902         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 903
 904         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 905 }
 906
 907 static void vlv_enable_backlight(struct intel_connector *connector)
 908 {
 909         struct drm_device *dev = connector->base.dev;
 910         struct drm_i915_private *dev_priv = dev->dev_private;
 911         struct intel_panel *panel = &connector->panel;
 912         enum pipe pipe = intel_get_pipe_from_connector(connector);
 913         u32 ctl, ctl2;
 914
 915         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 916         if (ctl2 & BLM_PWM_ENABLE) {
 917                 DRM_DEBUG_KMS("backlight already enabled\n");
 918                 ctl2 &= ~BLM_PWM_ENABLE;
 919                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 920         }
 921
 922         ctl = panel->backlight.max << 16;
 923         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 924
 925         /* XXX: combine this into above write? */
 926         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 927
 928         ctl2 = 0;
 929         if (panel->backlight.active_low_pwm)
 930                 ctl2 |= BLM_POLARITY_I965;
 931         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 932         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 933         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 934 }
 935
 936 void intel_panel_enable_backlight(struct intel_connector *connector)
 937 {
 938         struct drm_device *dev = connector->base.dev;
 939         struct drm_i915_private *dev_priv = dev->dev_private;
 940         struct intel_panel *panel = &connector->panel;
 941         enum pipe pipe = intel_get_pipe_from_connector(connector);
 942         unsigned long flags;
 943
 944         if (!panel->backlight.present || pipe == INVALID_PIPE)
 945                 return;
 946
 947         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 948
 949         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 950
 951         WARN_ON(panel->backlight.max == 0);
 952
 953         if (panel->backlight.level == 0) {
 954                 panel->backlight.level = panel->backlight.max;
 955                 if (panel->backlight.device)
 956                         panel->backlight.device->props.brightness =
 957                                 scale_hw_to_user(connector,
 958                                                  panel->backlight.level,
 959                                                  panel->backlight.device->props.max_brightness);
 960         }
 961
 962         dev_priv->display.enable_backlight(connector);
 963         panel->backlight.enabled = true;
 964         if (panel->backlight.device)
 965                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
 966
 967         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 968 }
 969
 970 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 971 static int intel_backlight_device_update_status(struct backlight_device *bd)
 972 {
 973         struct intel_connector *connector = bl_get_data(bd);
 974         struct intel_panel *panel = &connector->panel;
 975         struct drm_device *dev = connector->base.dev;
 976
 977         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 978         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 979                       bd->props.brightness, bd->props.max_brightness);
 980         intel_panel_set_backlight(connector, bd->props.brightness,
 981                                   bd->props.max_brightness);
 982
 983         /*
 984          * Allow flipping bl_power as a sub-state of enabled. Sadly the
 985          * backlight class device does not make it easy to to differentiate
 986          * between callbacks for brightness and bl_power, so our backlight_power
 987          * callback needs to take this into account.
 988          */
 989         if (panel->backlight.enabled) {
 990                 if (panel->backlight_power) {
 991                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
 992                                 bd->props.brightness != 0;
 993                         panel->backlight_power(connector, enable);
 994                 }
 995         } else {
 996                 bd->props.power = FB_BLANK_POWERDOWN;
 997         }
 998
 999         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1000         return 0;
1001 }
1002
1003 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1004 {
1005         struct intel_connector *connector = bl_get_data(bd);
1006         struct drm_device *dev = connector->base.dev;
1007         struct drm_i915_private *dev_priv = dev->dev_private;
1008         u32 hw_level;
1009         int ret;
1010
1011         intel_runtime_pm_get(dev_priv);
1012         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1013
1014         hw_level = intel_panel_get_backlight(connector);
1015         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1016
1017         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1018         intel_runtime_pm_put(dev_priv);
1019
1020         return ret;
1021 }
1022
1023 static const struct backlight_ops intel_backlight_device_ops = {
1024         .update_status = intel_backlight_device_update_status,
1025         .get_brightness = intel_backlight_device_get_brightness,
1026 };
1027
1028 static int intel_backlight_device_register(struct intel_connector *connector)
1029 {
1030         struct intel_panel *panel = &connector->panel;
1031         struct backlight_properties props;
1032
1033         if (WARN_ON(panel->backlight.device))
1034                 return -ENODEV;
1035
1036         WARN_ON(panel->backlight.max == 0);
1037
1038         memset(&props, 0, sizeof(props));
1039         props.type = BACKLIGHT_RAW;
1040
1041         /*
1042          * Note: Everything should work even if the backlight device max
1043          * presented to the userspace is arbitrarily chosen.
1044          */
1045         props.max_brightness = panel->backlight.max;
1046         props.brightness = scale_hw_to_user(connector,
1047                                             panel->backlight.level,
1048                                             props.max_brightness);
1049
1050         if (panel->backlight.enabled)
1051                 props.power = FB_BLANK_UNBLANK;
1052         else
1053                 props.power = FB_BLANK_POWERDOWN;
1054
1055         /*
1056          * Note: using the same name independent of the connector prevents
1057          * registration of multiple backlight devices in the driver.
1058          */
1059         panel->backlight.device =
1060                 backlight_device_register("intel_backlight",
1061                                           connector->base.kdev,
1062                                           connector,
1063                                           &intel_backlight_device_ops, &props);
1064
1065         if (IS_ERR(panel->backlight.device)) {
1066                 DRM_ERROR("Failed to register backlight: %ld\n",
1067                           PTR_ERR(panel->backlight.device));
1068                 panel->backlight.device = NULL;
1069                 return -ENODEV;
1070         }
1071         return 0;
1072 }
1073
1074 static void intel_backlight_device_unregister(struct intel_connector *connector)
1075 {
1076         struct intel_panel *panel = &connector->panel;
1077
1078         if (panel->backlight.device) {
1079                 backlight_device_unregister(panel->backlight.device);
1080                 panel->backlight.device = NULL;
1081         }
1082 }
1083 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1084 static int intel_backlight_device_register(struct intel_connector *connector)
1085 {
1086         return 0;
1087 }
1088 static void intel_backlight_device_unregister(struct intel_connector *connector)
1089 {
1090 }
1091 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1092
1093 /*
1094  * Note: The setup hooks can't assume pipe is set!
1095  *
1096  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1097  * appropriately when it's 0. Use VBT and/or sane defaults.
1098  */
1099 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1100 {
1101         struct drm_device *dev = connector->base.dev;
1102         struct drm_i915_private *dev_priv = dev->dev_private;
1103         struct intel_panel *panel = &connector->panel;
1104
1105         WARN_ON(panel->backlight.max == 0);
1106
1107         /* vbt value is a coefficient in range [0..255] */
1108         return scale(dev_priv->vbt.backlight.min_brightness, 0, 255,
1109                      0, panel->backlight.max);
1110 }
1111
1112 static int bdw_setup_backlight(struct intel_connector *connector)
1113 {
1114         struct drm_device *dev = connector->base.dev;
1115         struct drm_i915_private *dev_priv = dev->dev_private;
1116         struct intel_panel *panel = &connector->panel;
1117         u32 pch_ctl1, pch_ctl2, val;
1118
1119         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1120         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1121
1122         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1123         panel->backlight.max = pch_ctl2 >> 16;
1124         if (!panel->backlight.max)
1125                 return -ENODEV;
1126
1127         panel->backlight.min = get_backlight_min_vbt(connector);
1128
1129         val = bdw_get_backlight(connector);
1130         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1131
1132         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1133                 panel->backlight.level != 0;
1134
1135         return 0;
1136 }
1137
1138 static int pch_setup_backlight(struct intel_connector *connector)
1139 {
1140         struct drm_device *dev = connector->base.dev;
1141         struct drm_i915_private *dev_priv = dev->dev_private;
1142         struct intel_panel *panel = &connector->panel;
1143         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1144
1145         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1146         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1147
1148         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1149         panel->backlight.max = pch_ctl2 >> 16;
1150         if (!panel->backlight.max)
1151                 return -ENODEV;
1152
1153         panel->backlight.min = get_backlight_min_vbt(connector);
1154
1155         val = pch_get_backlight(connector);
1156         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1157
1158         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1159         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1160                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1161
1162         return 0;
1163 }
1164
1165 static int i9xx_setup_backlight(struct intel_connector *connector)
1166 {
1167         struct drm_device *dev = connector->base.dev;
1168         struct drm_i915_private *dev_priv = dev->dev_private;
1169         struct intel_panel *panel = &connector->panel;
1170         u32 ctl, val;
1171
1172         ctl = I915_READ(BLC_PWM_CTL);
1173
1174         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1175                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1176
1177         if (IS_PINEVIEW(dev))
1178                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1179
1180         panel->backlight.max = ctl >> 17;
1181         if (panel->backlight.combination_mode)
1182                 panel->backlight.max *= 0xff;
1183
1184         if (!panel->backlight.max)
1185                 return -ENODEV;
1186
1187         panel->backlight.min = get_backlight_min_vbt(connector);
1188
1189         val = i9xx_get_backlight(connector);
1190         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1191
1192         panel->backlight.enabled = panel->backlight.level != 0;
1193
1194         return 0;
1195 }
1196
1197 static int i965_setup_backlight(struct intel_connector *connector)
1198 {
1199         struct drm_device *dev = connector->base.dev;
1200         struct drm_i915_private *dev_priv = dev->dev_private;
1201         struct intel_panel *panel = &connector->panel;
1202         u32 ctl, ctl2, val;
1203
1204         ctl2 = I915_READ(BLC_PWM_CTL2);
1205         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1206         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1207
1208         ctl = I915_READ(BLC_PWM_CTL);
1209         panel->backlight.max = ctl >> 16;
1210         if (panel->backlight.combination_mode)
1211                 panel->backlight.max *= 0xff;
1212
1213         if (!panel->backlight.max)
1214                 return -ENODEV;
1215
1216         panel->backlight.min = get_backlight_min_vbt(connector);
1217
1218         val = i9xx_get_backlight(connector);
1219         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1220
1221         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1222                 panel->backlight.level != 0;
1223
1224         return 0;
1225 }
1226
1227 static int vlv_setup_backlight(struct intel_connector *connector)
1228 {
1229         struct drm_device *dev = connector->base.dev;
1230         struct drm_i915_private *dev_priv = dev->dev_private;
1231         struct intel_panel *panel = &connector->panel;
1232         enum pipe pipe;
1233         u32 ctl, ctl2, val;
1234
1235         for_each_pipe(dev_priv, pipe) {
1236                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1237
1238                 /* Skip if the modulation freq is already set */
1239                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1240                         continue;
1241
1242                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1243                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1244                            cur_val);
1245         }
1246
1247         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
1248         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1249
1250         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
1251         panel->backlight.max = ctl >> 16;
1252         if (!panel->backlight.max)
1253                 return -ENODEV;
1254
1255         panel->backlight.min = get_backlight_min_vbt(connector);
1256
1257         val = _vlv_get_backlight(dev, PIPE_A);
1258         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1259
1260         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1261                 panel->backlight.level != 0;
1262
1263         return 0;
1264 }
1265
1266 int intel_panel_setup_backlight(struct drm_connector *connector)
1267 {
1268         struct drm_device *dev = connector->dev;
1269         struct drm_i915_private *dev_priv = dev->dev_private;
1270         struct intel_connector *intel_connector = to_intel_connector(connector);
1271         struct intel_panel *panel = &intel_connector->panel;
1272         unsigned long flags;
1273         int ret;
1274
1275         if (!dev_priv->vbt.backlight.present) {
1276                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1277                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1278                 } else {
1279                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1280                         return 0;
1281                 }
1282         }
1283
1284         /* set level and max in panel struct */
1285         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
1286         ret = dev_priv->display.setup_backlight(intel_connector);
1287         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
1288
1289         if (ret) {
1290                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1291                               connector->name);
1292                 return ret;
1293         }
1294
1295         intel_backlight_device_register(intel_connector);
1296
1297         panel->backlight.present = true;
1298
1299         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1300                       "sysfs interface %sregistered\n",
1301                       panel->backlight.enabled ? "enabled" : "disabled",
1302                       panel->backlight.level, panel->backlight.max,
1303                       panel->backlight.device ? "" : "not ");
1304
1305         return 0;
1306 }
1307
1308 void intel_panel_destroy_backlight(struct drm_connector *connector)
1309 {
1310         struct intel_connector *intel_connector = to_intel_connector(connector);
1311         struct intel_panel *panel = &intel_connector->panel;
1312
1313         panel->backlight.present = false;
1314         intel_backlight_device_unregister(intel_connector);
1315 }
1316
1317 /* Set up chip specific backlight functions */
1318 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1319 {
1320         struct drm_i915_private *dev_priv = dev->dev_private;
1321
1322         if (IS_BROADWELL(dev)) {
1323                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1324                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1325                 dev_priv->display.disable_backlight = pch_disable_backlight;
1326                 dev_priv->display.set_backlight = bdw_set_backlight;
1327                 dev_priv->display.get_backlight = bdw_get_backlight;
1328         } else if (HAS_PCH_SPLIT(dev)) {
1329                 dev_priv->display.setup_backlight = pch_setup_backlight;
1330                 dev_priv->display.enable_backlight = pch_enable_backlight;
1331                 dev_priv->display.disable_backlight = pch_disable_backlight;
1332                 dev_priv->display.set_backlight = pch_set_backlight;
1333                 dev_priv->display.get_backlight = pch_get_backlight;
1334         } else if (IS_VALLEYVIEW(dev)) {
1335                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1336                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1337                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1338                 dev_priv->display.set_backlight = vlv_set_backlight;
1339                 dev_priv->display.get_backlight = vlv_get_backlight;
1340         } else if (IS_GEN4(dev)) {
1341                 dev_priv->display.setup_backlight = i965_setup_backlight;
1342                 dev_priv->display.enable_backlight = i965_enable_backlight;
1343                 dev_priv->display.disable_backlight = i965_disable_backlight;
1344                 dev_priv->display.set_backlight = i9xx_set_backlight;
1345                 dev_priv->display.get_backlight = i9xx_get_backlight;
1346         } else {
1347                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1348                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1349                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1350                 dev_priv->display.set_backlight = i9xx_set_backlight;
1351                 dev_priv->display.get_backlight = i9xx_get_backlight;
1352         }
1353 }
1354
1355 int intel_panel_init(struct intel_panel *panel,
1356                      struct drm_display_mode *fixed_mode,
1357                      struct drm_display_mode *downclock_mode)
1358 {
1359         panel->fixed_mode = fixed_mode;
1360         panel->downclock_mode = downclock_mode;
1361
1362         return 0;
1363 }
1364
1365 void intel_panel_fini(struct intel_panel *panel)
1366 {
1367         struct intel_connector *intel_connector =
1368                 container_of(panel, struct intel_connector, panel);
1369
1370         if (panel->fixed_mode)
1371                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1372
1373         if (panel->downclock_mode)
1374                 drm_mode_destroy(intel_connector->base.dev,
1375                                 panel->downclock_mode);
1376 }