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_state *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->base.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_state *pipe_config,
 225                               u32 *pfit_control)
 226 {
 227         struct drm_display_mode *adjusted_mode = &pipe_config->base.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_state *pipe_config,
 245                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 246                               u32 *border)
 247 {
 248         struct drm_display_mode *adjusted_mode = &pipe_config->base.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_state *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->base.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         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 523                 return 0;
 524
 525         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 526 }
 527
 528 static u32 vlv_get_backlight(struct intel_connector *connector)
 529 {
 530         struct drm_device *dev = connector->base.dev;
 531         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 532
 533         return _vlv_get_backlight(dev, pipe);
 534 }
 535
 536 #if 0
 537 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 538 {
 539         struct drm_device *dev = connector->base.dev;
 540         struct drm_i915_private *dev_priv = dev->dev_private;
 541         struct intel_panel *panel = &connector->panel;
 542         u32 val = 0;
 543
 544         mutex_lock(&dev_priv->backlight_lock);
 545
 546         if (panel->backlight.enabled) {
 547                 val = dev_priv->display.get_backlight(connector);
 548                 val = intel_panel_compute_brightness(connector, val);
 549         }
 550
 551         mutex_unlock(&dev_priv->backlight_lock);
 552
 553         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 554         return val;
 555 }
 556 #endif
 557
 558 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 559 {
 560         struct drm_device *dev = connector->base.dev;
 561         struct drm_i915_private *dev_priv = dev->dev_private;
 562         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 563         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 564 }
 565
 566 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 567 {
 568         struct drm_device *dev = connector->base.dev;
 569         struct drm_i915_private *dev_priv = dev->dev_private;
 570         u32 tmp;
 571
 572         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 573         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 574 }
 575
 576 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 577 {
 578         struct drm_device *dev = connector->base.dev;
 579         struct drm_i915_private *dev_priv = dev->dev_private;
 580         struct intel_panel *panel = &connector->panel;
 581         u32 tmp, mask;
 582
 583         WARN_ON(panel->backlight.max == 0);
 584
 585         if (panel->backlight.combination_mode) {
 586                 u8 lbpc;
 587
 588                 lbpc = level * 0xfe / panel->backlight.max + 1;
 589                 level /= lbpc;
 590                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 591         }
 592
 593         if (IS_GEN4(dev)) {
 594                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 595         } else {
 596                 level <<= 1;
 597                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 598         }
 599
 600         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 601         I915_WRITE(BLC_PWM_CTL, tmp | level);
 602 }
 603
 604 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 605 {
 606         struct drm_device *dev = connector->base.dev;
 607         struct drm_i915_private *dev_priv = dev->dev_private;
 608         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 609         u32 tmp;
 610
 611         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 612                 return;
 613
 614         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 615         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 616 }
 617
 618 static void
 619 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 620 {
 621         struct drm_device *dev = connector->base.dev;
 622         struct drm_i915_private *dev_priv = dev->dev_private;
 623
 624         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 625
 626         level = intel_panel_compute_brightness(connector, level);
 627         dev_priv->display.set_backlight(connector, level);
 628 }
 629
 630 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 631 static void intel_panel_set_backlight(struct intel_connector *connector,
 632                                       u32 user_level, u32 user_max)
 633 {
 634         struct drm_device *dev = connector->base.dev;
 635         struct drm_i915_private *dev_priv = dev->dev_private;
 636         struct intel_panel *panel = &connector->panel;
 637         u32 hw_level;
 638
 639         if (!panel->backlight.present)
 640                 return;
 641
 642         mutex_lock(&dev_priv->backlight_lock);
 643
 644         WARN_ON(panel->backlight.max == 0);
 645
 646         hw_level = scale_user_to_hw(connector, user_level, user_max);
 647         panel->backlight.level = hw_level;
 648
 649         if (panel->backlight.enabled)
 650                 intel_panel_actually_set_backlight(connector, hw_level);
 651
 652         mutex_unlock(&dev_priv->backlight_lock);
 653 }
 654
 655 /* set backlight brightness to level in range [0..max], assuming hw min is
 656  * respected.
 657  */
 658 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 659                                     u32 user_level, u32 user_max)
 660 {
 661         struct drm_device *dev = connector->base.dev;
 662         struct drm_i915_private *dev_priv = dev->dev_private;
 663         struct intel_panel *panel = &connector->panel;
 664         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 665         u32 hw_level;
 666
 667         /*
 668          * INVALID_PIPE may occur during driver init because
 669          * connection_mutex isn't held across the entire backlight
 670          * setup + modeset readout, and the BIOS can issue the
 671          * requests at any time.
 672          */
 673         if (!panel->backlight.present || pipe == INVALID_PIPE)
 674                 return;
 675
 676         mutex_lock(&dev_priv->backlight_lock);
 677
 678         WARN_ON(panel->backlight.max == 0);
 679
 680         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 681         panel->backlight.level = hw_level;
 682
 683         if (panel->backlight.device)
 684                 panel->backlight.device->props.brightness =
 685                         scale_hw_to_user(connector,
 686                                          panel->backlight.level,
 687                                          panel->backlight.device->props.max_brightness);
 688
 689         if (panel->backlight.enabled)
 690                 intel_panel_actually_set_backlight(connector, hw_level);
 691
 692         mutex_unlock(&dev_priv->backlight_lock);
 693 }
 694
 695 static void pch_disable_backlight(struct intel_connector *connector)
 696 {
 697         struct drm_device *dev = connector->base.dev;
 698         struct drm_i915_private *dev_priv = dev->dev_private;
 699         u32 tmp;
 700
 701         intel_panel_actually_set_backlight(connector, 0);
 702
 703         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 704         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 705
 706         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 707         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 708 }
 709
 710 static void i9xx_disable_backlight(struct intel_connector *connector)
 711 {
 712         intel_panel_actually_set_backlight(connector, 0);
 713 }
 714
 715 static void i965_disable_backlight(struct intel_connector *connector)
 716 {
 717         struct drm_device *dev = connector->base.dev;
 718         struct drm_i915_private *dev_priv = dev->dev_private;
 719         u32 tmp;
 720
 721         intel_panel_actually_set_backlight(connector, 0);
 722
 723         tmp = I915_READ(BLC_PWM_CTL2);
 724         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 725 }
 726
 727 static void vlv_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         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 732         u32 tmp;
 733
 734         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 735                 return;
 736
 737         intel_panel_actually_set_backlight(connector, 0);
 738
 739         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 740         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 741 }
 742
 743 void intel_panel_disable_backlight(struct intel_connector *connector)
 744 {
 745         struct drm_device *dev = connector->base.dev;
 746         struct drm_i915_private *dev_priv = dev->dev_private;
 747         struct intel_panel *panel = &connector->panel;
 748
 749         if (!panel->backlight.present)
 750                 return;
 751
 752         /*
 753          * Do not disable backlight on the vgaswitcheroo path. When switching
 754          * away from i915, the other client may depend on i915 to handle the
 755          * backlight. This will leave the backlight on unnecessarily when
 756          * another client is not activated.
 757          */
 758         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 759                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 760                 return;
 761         }
 762
 763         mutex_lock(&dev_priv->backlight_lock);
 764
 765         if (panel->backlight.device)
 766                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 767         panel->backlight.enabled = false;
 768         dev_priv->display.disable_backlight(connector);
 769
 770         mutex_unlock(&dev_priv->backlight_lock);
 771 }
 772
 773 static void bdw_enable_backlight(struct intel_connector *connector)
 774 {
 775         struct drm_device *dev = connector->base.dev;
 776         struct drm_i915_private *dev_priv = dev->dev_private;
 777         struct intel_panel *panel = &connector->panel;
 778         u32 pch_ctl1, pch_ctl2;
 779
 780         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 781         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 782                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 783                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 784                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 785         }
 786
 787         pch_ctl2 = panel->backlight.max << 16;
 788         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 789
 790         pch_ctl1 = 0;
 791         if (panel->backlight.active_low_pwm)
 792                 pch_ctl1 |= BLM_PCH_POLARITY;
 793
 794         /* After LPT, override is the default. */
 795         if (HAS_PCH_LPT(dev_priv))
 796                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 797
 798         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 799         POSTING_READ(BLC_PWM_PCH_CTL1);
 800         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 801
 802         /* This won't stick until the above enable. */
 803         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 804 }
 805
 806 static void pch_enable_backlight(struct intel_connector *connector)
 807 {
 808         struct drm_device *dev = connector->base.dev;
 809         struct drm_i915_private *dev_priv = dev->dev_private;
 810         struct intel_panel *panel = &connector->panel;
 811         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 812         enum transcoder cpu_transcoder =
 813                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 814         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 815
 816         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 817         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 818                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 819                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 820                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 821         }
 822
 823         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 824         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 825                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 826                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 827                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 828         }
 829
 830         if (cpu_transcoder == TRANSCODER_EDP)
 831                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 832         else
 833                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 834         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 835         POSTING_READ(BLC_PWM_CPU_CTL2);
 836         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 837
 838         /* This won't stick until the above enable. */
 839         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 840
 841         pch_ctl2 = panel->backlight.max << 16;
 842         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 843
 844         pch_ctl1 = 0;
 845         if (panel->backlight.active_low_pwm)
 846                 pch_ctl1 |= BLM_PCH_POLARITY;
 847
 848         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 849         POSTING_READ(BLC_PWM_PCH_CTL1);
 850         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 851 }
 852
 853 static void i9xx_enable_backlight(struct intel_connector *connector)
 854 {
 855         struct drm_device *dev = connector->base.dev;
 856         struct drm_i915_private *dev_priv = dev->dev_private;
 857         struct intel_panel *panel = &connector->panel;
 858         u32 ctl, freq;
 859
 860         ctl = I915_READ(BLC_PWM_CTL);
 861         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 862                 DRM_DEBUG_KMS("backlight already enabled\n");
 863                 I915_WRITE(BLC_PWM_CTL, 0);
 864         }
 865
 866         freq = panel->backlight.max;
 867         if (panel->backlight.combination_mode)
 868                 freq /= 0xff;
 869
 870         ctl = freq << 17;
 871         if (panel->backlight.combination_mode)
 872                 ctl |= BLM_LEGACY_MODE;
 873         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 874                 ctl |= BLM_POLARITY_PNV;
 875
 876         I915_WRITE(BLC_PWM_CTL, ctl);
 877         POSTING_READ(BLC_PWM_CTL);
 878
 879         /* XXX: combine this into above write? */
 880         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 881 }
 882
 883 static void i965_enable_backlight(struct intel_connector *connector)
 884 {
 885         struct drm_device *dev = connector->base.dev;
 886         struct drm_i915_private *dev_priv = dev->dev_private;
 887         struct intel_panel *panel = &connector->panel;
 888         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 889         u32 ctl, ctl2, freq;
 890
 891         ctl2 = I915_READ(BLC_PWM_CTL2);
 892         if (ctl2 & BLM_PWM_ENABLE) {
 893                 DRM_DEBUG_KMS("backlight already enabled\n");
 894                 ctl2 &= ~BLM_PWM_ENABLE;
 895                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 896         }
 897
 898         freq = panel->backlight.max;
 899         if (panel->backlight.combination_mode)
 900                 freq /= 0xff;
 901
 902         ctl = freq << 16;
 903         I915_WRITE(BLC_PWM_CTL, ctl);
 904
 905         ctl2 = BLM_PIPE(pipe);
 906         if (panel->backlight.combination_mode)
 907                 ctl2 |= BLM_COMBINATION_MODE;
 908         if (panel->backlight.active_low_pwm)
 909                 ctl2 |= BLM_POLARITY_I965;
 910         I915_WRITE(BLC_PWM_CTL2, ctl2);
 911         POSTING_READ(BLC_PWM_CTL2);
 912         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 913
 914         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 915 }
 916
 917 static void vlv_enable_backlight(struct intel_connector *connector)
 918 {
 919         struct drm_device *dev = connector->base.dev;
 920         struct drm_i915_private *dev_priv = dev->dev_private;
 921         struct intel_panel *panel = &connector->panel;
 922         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 923         u32 ctl, ctl2;
 924
 925         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 926                 return;
 927
 928         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 929         if (ctl2 & BLM_PWM_ENABLE) {
 930                 DRM_DEBUG_KMS("backlight already enabled\n");
 931                 ctl2 &= ~BLM_PWM_ENABLE;
 932                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 933         }
 934
 935         ctl = panel->backlight.max << 16;
 936         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 937
 938         /* XXX: combine this into above write? */
 939         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 940
 941         ctl2 = 0;
 942         if (panel->backlight.active_low_pwm)
 943                 ctl2 |= BLM_POLARITY_I965;
 944         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 945         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 946         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 947 }
 948
 949 void intel_panel_enable_backlight(struct intel_connector *connector)
 950 {
 951         struct drm_device *dev = connector->base.dev;
 952         struct drm_i915_private *dev_priv = dev->dev_private;
 953         struct intel_panel *panel = &connector->panel;
 954         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 955
 956         if (!panel->backlight.present)
 957                 return;
 958
 959         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 960
 961         mutex_lock(&dev_priv->backlight_lock);
 962
 963         WARN_ON(panel->backlight.max == 0);
 964
 965         if (panel->backlight.level <= panel->backlight.min) {
 966                 panel->backlight.level = panel->backlight.max;
 967                 if (panel->backlight.device)
 968                         panel->backlight.device->props.brightness =
 969                                 scale_hw_to_user(connector,
 970                                                  panel->backlight.level,
 971                                                  panel->backlight.device->props.max_brightness);
 972         }
 973
 974         dev_priv->display.enable_backlight(connector);
 975         panel->backlight.enabled = true;
 976         if (panel->backlight.device)
 977                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
 978
 979         mutex_unlock(&dev_priv->backlight_lock);
 980 }
 981
 982 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 983 static int intel_backlight_device_update_status(struct backlight_device *bd)
 984 {
 985 #if 0
 986         struct intel_connector *connector = bl_get_data(bd);
 987         struct intel_panel *panel = &connector->panel;
 988         struct drm_device *dev = connector->base.dev;
 989
 990         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 991         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 992                       bd->props.brightness, bd->props.max_brightness);
 993         intel_panel_set_backlight(connector, bd->props.brightness,
 994                                   bd->props.max_brightness);
 995
 996         /*
 997          * Allow flipping bl_power as a sub-state of enabled. Sadly the
 998          * backlight class device does not make it easy to to differentiate
 999          * between callbacks for brightness and bl_power, so our backlight_power
1000          * callback needs to take this into account.
1001          */
1002         if (panel->backlight.enabled) {
1003                 if (panel->backlight_power) {
1004                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1005                                 bd->props.brightness != 0;
1006                         panel->backlight_power(connector, enable);
1007                 }
1008         } else {
1009                 bd->props.power = FB_BLANK_POWERDOWN;
1010         }
1011
1012         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1013 #endif
1014         return 0;
1015 }
1016
1017 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1018 {
1019 #if 0
1020         struct intel_connector *connector = bl_get_data(bd);
1021         struct drm_device *dev = connector->base.dev;
1022         struct drm_i915_private *dev_priv = dev->dev_private;
1023         u32 hw_level;
1024         int ret;
1025
1026         intel_runtime_pm_get(dev_priv);
1027         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1028
1029         hw_level = intel_panel_get_backlight(connector);
1030         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1031
1032         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1033         intel_runtime_pm_put(dev_priv);
1034
1035         return ret;
1036 #endif
1037         return 0;
1038 }
1039
1040 static const struct backlight_ops intel_backlight_device_ops = {
1041         .update_status = intel_backlight_device_update_status,
1042         .get_brightness = intel_backlight_device_get_brightness,
1043 };
1044
1045 static int intel_backlight_device_register(struct intel_connector *connector)
1046 {
1047         struct intel_panel *panel = &connector->panel;
1048         struct backlight_properties props;
1049
1050         if (WARN_ON(panel->backlight.device))
1051                 return -ENODEV;
1052
1053         if (!panel->backlight.present)
1054                 return 0;
1055
1056         WARN_ON(panel->backlight.max == 0);
1057
1058         memset(&props, 0, sizeof(props));
1059         props.type = BACKLIGHT_RAW;
1060
1061         /*
1062          * Note: Everything should work even if the backlight device max
1063          * presented to the userspace is arbitrarily chosen.
1064          */
1065         props.max_brightness = panel->backlight.max;
1066         props.brightness = scale_hw_to_user(connector,
1067                                             panel->backlight.level,
1068                                             props.max_brightness);
1069
1070         if (panel->backlight.enabled)
1071                 props.power = FB_BLANK_UNBLANK;
1072         else
1073                 props.power = FB_BLANK_POWERDOWN;
1074
1075         /*
1076          * Note: using the same name independent of the connector prevents
1077          * registration of multiple backlight devices in the driver.
1078          */
1079 #if 0
1080         panel->backlight.device =
1081                 backlight_device_register("intel_backlight",
1082                                           connector->base.kdev,
1083                                           connector,
1084                                           &intel_backlight_device_ops, &props);
1085
1086         if (IS_ERR(panel->backlight.device)) {
1087                 DRM_ERROR("Failed to register backlight: %ld\n",
1088                           PTR_ERR(panel->backlight.device));
1089                 panel->backlight.device = NULL;
1090                 return -ENODEV;
1091         }
1092 #endif
1093
1094         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1095                       connector->base.name);
1096
1097         return 0;
1098 }
1099
1100 static void intel_backlight_device_unregister(struct intel_connector *connector)
1101 {
1102 #if 0
1103         struct intel_panel *panel = &connector->panel;
1104
1105         if (panel->backlight.device) {
1106                 backlight_device_unregister(panel->backlight.device);
1107                 panel->backlight.device = NULL;
1108         }
1109 #endif
1110 }
1111 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1112 static int intel_backlight_device_register(struct intel_connector *connector)
1113 {
1114         return 0;
1115 }
1116 static void intel_backlight_device_unregister(struct intel_connector *connector)
1117 {
1118 }
1119 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1120
1121 /*
1122  * Note: The setup hooks can't assume pipe is set!
1123  *
1124  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1125  * appropriately when it's 0. Use VBT and/or sane defaults.
1126  */
1127 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1128 {
1129         struct drm_device *dev = connector->base.dev;
1130         struct drm_i915_private *dev_priv = dev->dev_private;
1131         struct intel_panel *panel = &connector->panel;
1132         int min;
1133
1134         WARN_ON(panel->backlight.max == 0);
1135
1136         /*
1137          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1138          * to problems. There are such machines out there. Either our
1139          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1140          * against this by letting the minimum be at most (arbitrarily chosen)
1141          * 25% of the max.
1142          */
1143         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1144         if (min != dev_priv->vbt.backlight.min_brightness) {
1145                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1146                               dev_priv->vbt.backlight.min_brightness, min);
1147         }
1148
1149         /* vbt value is a coefficient in range [0..255] */
1150         return scale(min, 0, 255, 0, panel->backlight.max);
1151 }
1152
1153 static int bdw_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1154 {
1155         struct drm_device *dev = connector->base.dev;
1156         struct drm_i915_private *dev_priv = dev->dev_private;
1157         struct intel_panel *panel = &connector->panel;
1158         u32 pch_ctl1, pch_ctl2, val;
1159
1160         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1161         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1162
1163         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1164         panel->backlight.max = pch_ctl2 >> 16;
1165         if (!panel->backlight.max)
1166                 return -ENODEV;
1167
1168         panel->backlight.min = get_backlight_min_vbt(connector);
1169
1170         val = bdw_get_backlight(connector);
1171         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1172
1173         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1174                 panel->backlight.level != 0;
1175
1176         return 0;
1177 }
1178
1179 static int pch_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1180 {
1181         struct drm_device *dev = connector->base.dev;
1182         struct drm_i915_private *dev_priv = dev->dev_private;
1183         struct intel_panel *panel = &connector->panel;
1184         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1185
1186         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1187         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1188
1189         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1190         panel->backlight.max = pch_ctl2 >> 16;
1191         if (!panel->backlight.max)
1192                 return -ENODEV;
1193
1194         panel->backlight.min = get_backlight_min_vbt(connector);
1195
1196         val = pch_get_backlight(connector);
1197         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1198
1199         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1200         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1201                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1202
1203         return 0;
1204 }
1205
1206 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1207 {
1208         struct drm_device *dev = connector->base.dev;
1209         struct drm_i915_private *dev_priv = dev->dev_private;
1210         struct intel_panel *panel = &connector->panel;
1211         u32 ctl, val;
1212
1213         ctl = I915_READ(BLC_PWM_CTL);
1214
1215         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1216                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1217
1218         if (IS_PINEVIEW(dev))
1219                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1220
1221         panel->backlight.max = ctl >> 17;
1222         if (panel->backlight.combination_mode)
1223                 panel->backlight.max *= 0xff;
1224
1225         if (!panel->backlight.max)
1226                 return -ENODEV;
1227
1228         panel->backlight.min = get_backlight_min_vbt(connector);
1229
1230         val = i9xx_get_backlight(connector);
1231         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1232
1233         panel->backlight.enabled = panel->backlight.level != 0;
1234
1235         return 0;
1236 }
1237
1238 static int i965_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1239 {
1240         struct drm_device *dev = connector->base.dev;
1241         struct drm_i915_private *dev_priv = dev->dev_private;
1242         struct intel_panel *panel = &connector->panel;
1243         u32 ctl, ctl2, val;
1244
1245         ctl2 = I915_READ(BLC_PWM_CTL2);
1246         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1247         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1248
1249         ctl = I915_READ(BLC_PWM_CTL);
1250         panel->backlight.max = ctl >> 16;
1251         if (panel->backlight.combination_mode)
1252                 panel->backlight.max *= 0xff;
1253
1254         if (!panel->backlight.max)
1255                 return -ENODEV;
1256
1257         panel->backlight.min = get_backlight_min_vbt(connector);
1258
1259         val = i9xx_get_backlight(connector);
1260         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1261
1262         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1263                 panel->backlight.level != 0;
1264
1265         return 0;
1266 }
1267
1268 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_pipe pipe)
1269 {
1270         struct drm_device *dev = connector->base.dev;
1271         struct drm_i915_private *dev_priv = dev->dev_private;
1272         struct intel_panel *panel = &connector->panel;
1273         enum i915_pipe p;
1274         u32 ctl, ctl2, val;
1275
1276         for_each_pipe(dev_priv, p) {
1277                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1278
1279                 /* Skip if the modulation freq is already set */
1280                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1281                         continue;
1282
1283                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1284                 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1285                            cur_val);
1286         }
1287
1288         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1289                 return -ENODEV;
1290
1291         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1292         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1293
1294         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1295         panel->backlight.max = ctl >> 16;
1296         if (!panel->backlight.max)
1297                 return -ENODEV;
1298
1299         panel->backlight.min = get_backlight_min_vbt(connector);
1300
1301         val = _vlv_get_backlight(dev, pipe);
1302         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1303
1304         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1305                 panel->backlight.level != 0;
1306
1307         return 0;
1308 }
1309
1310 #ifdef __DragonFly__
1311 /*
1312  * Read max backlight level
1313  */
1314 static int
1315 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1316 {
1317         int err, val;
1318         struct intel_connector *connector = arg1;
1319         struct drm_device *dev = connector->base.dev;
1320         struct drm_i915_private *dev_priv = dev->dev_private;
1321         struct intel_panel *panel = &connector->panel;
1322
1323         mutex_lock(&dev_priv->backlight_lock);
1324         val = panel->backlight.max;
1325         mutex_unlock(&dev_priv->backlight_lock);
1326
1327         err = sysctl_handle_int(oidp, &val, 0, req);
1328         return(err);
1329 }
1330
1331 /*
1332  * Read/write backlight level
1333  */
1334 static int
1335 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1336 {
1337         struct intel_connector *connector = arg1;
1338         struct drm_device *dev = connector->base.dev;
1339         struct drm_i915_private *dev_priv = dev->dev_private;
1340         struct intel_panel *panel = &connector->panel;
1341         int err, val;
1342         u32 user_level, max_brightness;
1343
1344         mutex_lock(&dev_priv->backlight_lock);
1345         max_brightness = panel->backlight.max;
1346         user_level = scale_hw_to_user(connector, panel->backlight.level,
1347             max_brightness);
1348         mutex_unlock(&dev_priv->backlight_lock);
1349
1350         val = user_level;
1351         err = sysctl_handle_int(oidp, &val, 0, req);
1352         if (err != 0 || req->newptr == NULL) {
1353                 return(err);
1354         }
1355
1356         if (val != user_level && val >= 0 && val <= max_brightness) {
1357                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1358                 intel_panel_set_backlight(arg1, val, max_brightness);
1359                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1360         }
1361
1362         return(err);
1363 }
1364 #endif /* __DragonFly__ */
1365
1366 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe)
1367 {
1368         struct drm_device *dev = connector->dev;
1369         struct drm_i915_private *dev_priv = dev->dev_private;
1370         struct intel_connector *intel_connector = to_intel_connector(connector);
1371         struct intel_panel *panel = &intel_connector->panel;
1372         int ret;
1373
1374         if (!dev_priv->vbt.backlight.present) {
1375                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1376                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1377                 } else {
1378                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1379                         return 0;
1380                 }
1381         }
1382
1383         /* set level and max in panel struct */
1384         mutex_lock(&dev_priv->backlight_lock);
1385         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1386         mutex_unlock(&dev_priv->backlight_lock);
1387
1388         if (ret) {
1389                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1390                               connector->name);
1391                 return ret;
1392         }
1393
1394         panel->backlight.present = true;
1395
1396 #ifdef __DragonFly__
1397         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1398                         OID_AUTO, "backlight_max",
1399                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1400                         connector, sizeof(int),
1401                         sysctl_backlight_max,
1402                         "I", "Max backlight level");
1403         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1404                         OID_AUTO, "backlight_level",
1405                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1406                         connector, sizeof(int),
1407                         sysctl_backlight_handler,
1408                         "I", "Backlight level");
1409 #endif
1410
1411         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1412                       connector->name,
1413                       panel->backlight.enabled ? "enabled" : "disabled",
1414                       panel->backlight.level, panel->backlight.max);
1415
1416         return 0;
1417 }
1418
1419 void intel_panel_destroy_backlight(struct drm_connector *connector)
1420 {
1421         struct intel_connector *intel_connector = to_intel_connector(connector);
1422         struct intel_panel *panel = &intel_connector->panel;
1423
1424         panel->backlight.present = false;
1425 }
1426
1427 /* Set up chip specific backlight functions */
1428 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1429 {
1430         struct drm_i915_private *dev_priv = dev->dev_private;
1431
1432         if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) {
1433                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1434                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1435                 dev_priv->display.disable_backlight = pch_disable_backlight;
1436                 dev_priv->display.set_backlight = bdw_set_backlight;
1437                 dev_priv->display.get_backlight = bdw_get_backlight;
1438         } else if (HAS_PCH_SPLIT(dev)) {
1439                 dev_priv->display.setup_backlight = pch_setup_backlight;
1440                 dev_priv->display.enable_backlight = pch_enable_backlight;
1441                 dev_priv->display.disable_backlight = pch_disable_backlight;
1442                 dev_priv->display.set_backlight = pch_set_backlight;
1443                 dev_priv->display.get_backlight = pch_get_backlight;
1444         } else if (IS_VALLEYVIEW(dev)) {
1445                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1446                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1447                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1448                 dev_priv->display.set_backlight = vlv_set_backlight;
1449                 dev_priv->display.get_backlight = vlv_get_backlight;
1450         } else if (IS_GEN4(dev)) {
1451                 dev_priv->display.setup_backlight = i965_setup_backlight;
1452                 dev_priv->display.enable_backlight = i965_enable_backlight;
1453                 dev_priv->display.disable_backlight = i965_disable_backlight;
1454                 dev_priv->display.set_backlight = i9xx_set_backlight;
1455                 dev_priv->display.get_backlight = i9xx_get_backlight;
1456         } else {
1457                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1458                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1459                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1460                 dev_priv->display.set_backlight = i9xx_set_backlight;
1461                 dev_priv->display.get_backlight = i9xx_get_backlight;
1462         }
1463 }
1464
1465 int intel_panel_init(struct intel_panel *panel,
1466                      struct drm_display_mode *fixed_mode,
1467                      struct drm_display_mode *downclock_mode)
1468 {
1469         panel->fixed_mode = fixed_mode;
1470         panel->downclock_mode = downclock_mode;
1471
1472         return 0;
1473 }
1474
1475 void intel_panel_fini(struct intel_panel *panel)
1476 {
1477         struct intel_connector *intel_connector =
1478                 container_of(panel, struct intel_connector, panel);
1479
1480         if (panel->fixed_mode)
1481                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1482
1483         if (panel->downclock_mode)
1484                 drm_mode_destroy(intel_connector->base.dev,
1485                                 panel->downclock_mode);
1486 }
1487
1488 void intel_backlight_register(struct drm_device *dev)
1489 {
1490         struct intel_connector *connector;
1491
1492         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1493                 intel_backlight_device_register(connector);
1494 }
1495
1496 void intel_backlight_unregister(struct drm_device *dev)
1497 {
1498         struct intel_connector *connector;
1499
1500         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1501                 intel_backlight_device_unregister(connector);
1502 }