drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <[email protected]>
   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 <[email protected]>
  26  *      Dave Airlie <[email protected]>
  27  *      Jesse Barnes <[email protected]>
  28  *      Chris Wilson <[email protected]>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/kernel.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/pwm.h>
  36 #include "intel_drv.h"
  37
  38 #define CRC_PMIC_PWM_PERIOD_NS  21333
  39
  40 void
  41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  42                        struct drm_display_mode *adjusted_mode)
  43 {
  44         drm_mode_copy(adjusted_mode, fixed_mode);
  45
  46         drm_mode_set_crtcinfo(adjusted_mode, 0);
  47 }
  48
  49 /**
  50  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  51  * @dev: drm device
  52  * @fixed_mode : panel native mode
  53  * @connector: LVDS/eDP connector
  54  *
  55  * Return downclock_avail
  56  * Find the reduced downclock for LVDS/eDP in EDID.
  57  */
  58 struct drm_display_mode *
  59 intel_find_panel_downclock(struct drm_device *dev,
  60                         struct drm_display_mode *fixed_mode,
  61                         struct drm_connector *connector)
  62 {
  63         struct drm_display_mode *scan, *tmp_mode;
  64         int temp_downclock;
  65
  66         temp_downclock = fixed_mode->clock;
  67         tmp_mode = NULL;
  68
  69         list_for_each_entry(scan, &connector->probed_modes, head) {
  70                 /*
  71                  * If one mode has the same resolution with the fixed_panel
  72                  * mode while they have the different refresh rate, it means
  73                  * that the reduced downclock is found. In such
  74                  * case we can set the different FPx0/1 to dynamically select
  75                  * between low and high frequency.
  76                  */
  77                 if (scan->hdisplay == fixed_mode->hdisplay &&
  78                     scan->hsync_start == fixed_mode->hsync_start &&
  79                     scan->hsync_end == fixed_mode->hsync_end &&
  80                     scan->htotal == fixed_mode->htotal &&
  81                     scan->vdisplay == fixed_mode->vdisplay &&
  82                     scan->vsync_start == fixed_mode->vsync_start &&
  83                     scan->vsync_end == fixed_mode->vsync_end &&
  84                     scan->vtotal == fixed_mode->vtotal) {
  85                         if (scan->clock < temp_downclock) {
  86                                 /*
  87                                  * The downclock is already found. But we
  88                                  * expect to find the lower downclock.
  89                                  */
  90                                 temp_downclock = scan->clock;
  91                                 tmp_mode = scan;
  92                         }
  93                 }
  94         }
  95
  96         if (temp_downclock < fixed_mode->clock)
  97                 return drm_mode_duplicate(dev, tmp_mode);
  98         else
  99                 return NULL;
 100 }
 101
 102 /* adjusted_mode has been preset to be the panel's fixed mode */
 103 void
 104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 105                         struct intel_crtc_state *pipe_config,
 106                         int fitting_mode)
 107 {
 108         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 109         int x = 0, y = 0, width = 0, height = 0;
 110
 111         /* Native modes don't need fitting */
 112         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 113             adjusted_mode->crtc_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->crtc_hdisplay - width + 1)/2;
 121                 y = (adjusted_mode->crtc_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->crtc_hdisplay
 128                                 * pipe_config->pipe_src_h;
 129                         u32 scaled_height = pipe_config->pipe_src_w
 130                                 * adjusted_mode->crtc_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->crtc_hdisplay - width + 1) / 2;
 136                                 y = 0;
 137                                 height = adjusted_mode->crtc_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->crtc_vdisplay - height + 1) / 2;
 143                                 x = 0;
 144                                 width = adjusted_mode->crtc_hdisplay;
 145                         } else {
 146                                 x = y = 0;
 147                                 width = adjusted_mode->crtc_hdisplay;
 148                                 height = adjusted_mode->crtc_vdisplay;
 149                         }
 150                 }
 151                 break;
 152
 153         case DRM_MODE_SCALE_FULLSCREEN:
 154                 x = y = 0;
 155                 width = adjusted_mode->crtc_hdisplay;
 156                 height = adjusted_mode->crtc_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 *adjusted_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 = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 178         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 179         sync_pos = (blank_width - sync_width + 1) / 2;
 180
 181         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 182         border += border & 1; /* make the border even */
 183
 184         adjusted_mode->crtc_hdisplay = width;
 185         adjusted_mode->crtc_hblank_start = width + border;
 186         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 187
 188         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 189         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 190 }
 191
 192 static void
 193 centre_vertically(struct drm_display_mode *adjusted_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 = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 200         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 201         sync_pos = (blank_width - sync_width + 1) / 2;
 202
 203         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 204
 205         adjusted_mode->crtc_vdisplay = height;
 206         adjusted_mode->crtc_vblank_start = height + border;
 207         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 208
 209         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 210         adjusted_mode->crtc_vsync_end = adjusted_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_state *pipe_config,
 227                               u32 *pfit_control)
 228 {
 229         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 230         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 231                 pipe_config->pipe_src_h;
 232         u32 scaled_height = pipe_config->pipe_src_w *
 233                 adjusted_mode->crtc_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->crtc_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_state *pipe_config,
 247                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 248                               u32 *border)
 249 {
 250         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 251         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 252                 pipe_config->pipe_src_h;
 253         u32 scaled_height = pipe_config->pipe_src_w *
 254                 adjusted_mode->crtc_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->crtc_vdisplay) {
 269                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 270                                                     adjusted_mode->crtc_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->crtc_hdisplay) {
 285                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 286                                                     adjusted_mode->crtc_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_state *pipe_config,
 305                               int fitting_mode)
 306 {
 307         struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
 308         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 309         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 310
 311         /* Native modes don't need fitting */
 312         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 313             adjusted_mode->crtc_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_GEN(dev_priv) >= 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->crtc_vdisplay ||
 340                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 341                         pfit_control |= PFIT_ENABLE;
 342                         if (INTEL_GEN(dev_priv) >= 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_GEN(dev_priv) >= 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_GEN(dev_priv) < 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 = to_i915(dev);
 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 *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_i915_private *dev_priv = to_i915(connector->base.dev);
 465         struct intel_panel *panel = &connector->panel;
 466
 467         WARN_ON(panel->backlight.max == 0);
 468
 469         if (i915.invert_brightness < 0)
 470                 return val;
 471
 472         if (i915.invert_brightness > 0 ||
 473             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 474                 return panel->backlight.max - val;
 475         }
 476
 477         return val;
 478 }
 479
 480 static u32 lpt_get_backlight(struct intel_connector *connector)
 481 {
 482         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 483
 484         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 485 }
 486
 487 static u32 pch_get_backlight(struct intel_connector *connector)
 488 {
 489         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 490
 491         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 492 }
 493
 494 static u32 i9xx_get_backlight(struct intel_connector *connector)
 495 {
 496         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 497         struct intel_panel *panel = &connector->panel;
 498         u32 val;
 499
 500         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 501         if (INTEL_INFO(dev_priv)->gen < 4)
 502                 val >>= 1;
 503
 504         if (panel->backlight.combination_mode) {
 505                 u8 lbpc;
 506
 507                 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
 508                 val *= lbpc;
 509         }
 510
 511         return val;
 512 }
 513
 514 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
 515 {
 516         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 517                 return 0;
 518
 519         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 520 }
 521
 522 static u32 vlv_get_backlight(struct intel_connector *connector)
 523 {
 524         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 525         enum pipe pipe = intel_get_pipe_from_connector(connector);
 526
 527         return _vlv_get_backlight(dev_priv, pipe);
 528 }
 529
 530 static u32 bxt_get_backlight(struct intel_connector *connector)
 531 {
 532         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 533         struct intel_panel *panel = &connector->panel;
 534
 535         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 536 }
 537
 538 static u32 pwm_get_backlight(struct intel_connector *connector)
 539 {
 540         struct intel_panel *panel = &connector->panel;
 541         int duty_ns;
 542
 543         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 544         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 545 }
 546
 547 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 548 {
 549         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 550         struct intel_panel *panel = &connector->panel;
 551         u32 val = 0;
 552
 553         mutex_lock(&dev_priv->backlight_lock);
 554
 555         if (panel->backlight.enabled) {
 556                 val = panel->backlight.get(connector);
 557                 val = intel_panel_compute_brightness(connector, val);
 558         }
 559
 560         mutex_unlock(&dev_priv->backlight_lock);
 561
 562         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 563         return val;
 564 }
 565
 566 static void lpt_set_backlight(struct intel_connector *connector, u32 level)
 567 {
 568         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 569         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 570         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 571 }
 572
 573 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 574 {
 575         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 576         u32 tmp;
 577
 578         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 579         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 580 }
 581
 582 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 583 {
 584         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 585         struct intel_panel *panel = &connector->panel;
 586         u32 tmp, mask;
 587
 588         WARN_ON(panel->backlight.max == 0);
 589
 590         if (panel->backlight.combination_mode) {
 591                 u8 lbpc;
 592
 593                 lbpc = level * 0xfe / panel->backlight.max + 1;
 594                 level /= lbpc;
 595                 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
 596         }
 597
 598         if (IS_GEN4(dev_priv)) {
 599                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 600         } else {
 601                 level <<= 1;
 602                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 603         }
 604
 605         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 606         I915_WRITE(BLC_PWM_CTL, tmp | level);
 607 }
 608
 609 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 610 {
 611         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 612         enum pipe pipe = intel_get_pipe_from_connector(connector);
 613         u32 tmp;
 614
 615         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 616                 return;
 617
 618         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 619         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 620 }
 621
 622 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
 623 {
 624         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 625         struct intel_panel *panel = &connector->panel;
 626
 627         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 628 }
 629
 630 static void pwm_set_backlight(struct intel_connector *connector, u32 level)
 631 {
 632         struct intel_panel *panel = &connector->panel;
 633         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 634
 635         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 636 }
 637
 638 static void
 639 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 640 {
 641         struct intel_panel *panel = &connector->panel;
 642
 643         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 644
 645         level = intel_panel_compute_brightness(connector, level);
 646         panel->backlight.set(connector, level);
 647 }
 648
 649 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 650 static void intel_panel_set_backlight(struct intel_connector *connector,
 651                                       u32 user_level, u32 user_max)
 652 {
 653         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 654         struct intel_panel *panel = &connector->panel;
 655         u32 hw_level;
 656
 657         if (!panel->backlight.present)
 658                 return;
 659
 660         mutex_lock(&dev_priv->backlight_lock);
 661
 662         WARN_ON(panel->backlight.max == 0);
 663
 664         hw_level = scale_user_to_hw(connector, user_level, user_max);
 665         panel->backlight.level = hw_level;
 666
 667         if (panel->backlight.enabled)
 668                 intel_panel_actually_set_backlight(connector, hw_level);
 669
 670         mutex_unlock(&dev_priv->backlight_lock);
 671 }
 672
 673 /* set backlight brightness to level in range [0..max], assuming hw min is
 674  * respected.
 675  */
 676 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 677                                     u32 user_level, u32 user_max)
 678 {
 679         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 680         struct intel_panel *panel = &connector->panel;
 681         enum pipe pipe = intel_get_pipe_from_connector(connector);
 682         u32 hw_level;
 683
 684         /*
 685          * INVALID_PIPE may occur during driver init because
 686          * connection_mutex isn't held across the entire backlight
 687          * setup + modeset readout, and the BIOS can issue the
 688          * requests at any time.
 689          */
 690         if (!panel->backlight.present || pipe == INVALID_PIPE)
 691                 return;
 692
 693         mutex_lock(&dev_priv->backlight_lock);
 694
 695         WARN_ON(panel->backlight.max == 0);
 696
 697         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 698         panel->backlight.level = hw_level;
 699
 700         if (panel->backlight.device)
 701                 panel->backlight.device->props.brightness =
 702                         scale_hw_to_user(connector,
 703                                          panel->backlight.level,
 704                                          panel->backlight.device->props.max_brightness);
 705
 706         if (panel->backlight.enabled)
 707                 intel_panel_actually_set_backlight(connector, hw_level);
 708
 709         mutex_unlock(&dev_priv->backlight_lock);
 710 }
 711
 712 static void lpt_disable_backlight(struct intel_connector *connector)
 713 {
 714         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 715         u32 tmp;
 716
 717         intel_panel_actually_set_backlight(connector, 0);
 718
 719         /*
 720          * Although we don't support or enable CPU PWM with LPT/SPT based
 721          * systems, it may have been enabled prior to loading the
 722          * driver. Disable to avoid warnings on LCPLL disable.
 723          *
 724          * This needs rework if we need to add support for CPU PWM on PCH split
 725          * platforms.
 726          */
 727         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 728         if (tmp & BLM_PWM_ENABLE) {
 729                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
 730                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 731         }
 732
 733         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 734         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 735 }
 736
 737 static void pch_disable_backlight(struct intel_connector *connector)
 738 {
 739         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 740         u32 tmp;
 741
 742         intel_panel_actually_set_backlight(connector, 0);
 743
 744         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 745         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 746
 747         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 748         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 749 }
 750
 751 static void i9xx_disable_backlight(struct intel_connector *connector)
 752 {
 753         intel_panel_actually_set_backlight(connector, 0);
 754 }
 755
 756 static void i965_disable_backlight(struct intel_connector *connector)
 757 {
 758         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 759         u32 tmp;
 760
 761         intel_panel_actually_set_backlight(connector, 0);
 762
 763         tmp = I915_READ(BLC_PWM_CTL2);
 764         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 765 }
 766
 767 static void vlv_disable_backlight(struct intel_connector *connector)
 768 {
 769         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 770         enum pipe pipe = intel_get_pipe_from_connector(connector);
 771         u32 tmp;
 772
 773         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 774                 return;
 775
 776         intel_panel_actually_set_backlight(connector, 0);
 777
 778         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 779         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 780 }
 781
 782 static void bxt_disable_backlight(struct intel_connector *connector)
 783 {
 784         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 785         struct intel_panel *panel = &connector->panel;
 786         u32 tmp, val;
 787
 788         intel_panel_actually_set_backlight(connector, 0);
 789
 790         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 791         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 792                         tmp & ~BXT_BLC_PWM_ENABLE);
 793
 794         if (panel->backlight.controller == 1) {
 795                 val = I915_READ(UTIL_PIN_CTL);
 796                 val &= ~UTIL_PIN_ENABLE;
 797                 I915_WRITE(UTIL_PIN_CTL, val);
 798         }
 799 }
 800
 801 static void pwm_disable_backlight(struct intel_connector *connector)
 802 {
 803         struct intel_panel *panel = &connector->panel;
 804
 805         /* Disable the backlight */
 806         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 807         usleep_range(2000, 3000);
 808         pwm_disable(panel->backlight.pwm);
 809 }
 810
 811 void intel_panel_disable_backlight(struct intel_connector *connector)
 812 {
 813         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 814         struct intel_panel *panel = &connector->panel;
 815
 816         if (!panel->backlight.present)
 817                 return;
 818
 819         /*
 820          * Do not disable backlight on the vga_switcheroo path. When switching
 821          * away from i915, the other client may depend on i915 to handle the
 822          * backlight. This will leave the backlight on unnecessarily when
 823          * another client is not activated.
 824          */
 825         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 826                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 827                 return;
 828         }
 829
 830         mutex_lock(&dev_priv->backlight_lock);
 831
 832         if (panel->backlight.device)
 833                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 834         panel->backlight.enabled = false;
 835         panel->backlight.disable(connector);
 836
 837         mutex_unlock(&dev_priv->backlight_lock);
 838 }
 839
 840 static void lpt_enable_backlight(struct intel_connector *connector)
 841 {
 842         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 843         struct intel_panel *panel = &connector->panel;
 844         u32 pch_ctl1, pch_ctl2, schicken;
 845
 846         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 847         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 848                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 849                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 850                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 851         }
 852
 853         if (HAS_PCH_LPT(dev_priv)) {
 854                 schicken = I915_READ(SOUTH_CHICKEN2);
 855                 if (panel->backlight.alternate_pwm_increment)
 856                         schicken |= LPT_PWM_GRANULARITY;
 857                 else
 858                         schicken &= ~LPT_PWM_GRANULARITY;
 859                 I915_WRITE(SOUTH_CHICKEN2, schicken);
 860         } else {
 861                 schicken = I915_READ(SOUTH_CHICKEN1);
 862                 if (panel->backlight.alternate_pwm_increment)
 863                         schicken |= SPT_PWM_GRANULARITY;
 864                 else
 865                         schicken &= ~SPT_PWM_GRANULARITY;
 866                 I915_WRITE(SOUTH_CHICKEN1, schicken);
 867         }
 868
 869         pch_ctl2 = panel->backlight.max << 16;
 870         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 871
 872         pch_ctl1 = 0;
 873         if (panel->backlight.active_low_pwm)
 874                 pch_ctl1 |= BLM_PCH_POLARITY;
 875
 876         /* After LPT, override is the default. */
 877         if (HAS_PCH_LPT(dev_priv))
 878                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 879
 880         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 881         POSTING_READ(BLC_PWM_PCH_CTL1);
 882         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 883
 884         /* This won't stick until the above enable. */
 885         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 886 }
 887
 888 static void pch_enable_backlight(struct intel_connector *connector)
 889 {
 890         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 891         struct intel_panel *panel = &connector->panel;
 892         enum pipe pipe = intel_get_pipe_from_connector(connector);
 893         enum transcoder cpu_transcoder =
 894                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 895         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 896
 897         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 898         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 899                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 900                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 901                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 902         }
 903
 904         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 905         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 906                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 907                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 908                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 909         }
 910
 911         if (cpu_transcoder == TRANSCODER_EDP)
 912                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 913         else
 914                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 915         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 916         POSTING_READ(BLC_PWM_CPU_CTL2);
 917         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 918
 919         /* This won't stick until the above enable. */
 920         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 921
 922         pch_ctl2 = panel->backlight.max << 16;
 923         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 924
 925         pch_ctl1 = 0;
 926         if (panel->backlight.active_low_pwm)
 927                 pch_ctl1 |= BLM_PCH_POLARITY;
 928
 929         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 930         POSTING_READ(BLC_PWM_PCH_CTL1);
 931         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 932 }
 933
 934 static void i9xx_enable_backlight(struct intel_connector *connector)
 935 {
 936         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 937         struct intel_panel *panel = &connector->panel;
 938         u32 ctl, freq;
 939
 940         ctl = I915_READ(BLC_PWM_CTL);
 941         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 942                 DRM_DEBUG_KMS("backlight already enabled\n");
 943                 I915_WRITE(BLC_PWM_CTL, 0);
 944         }
 945
 946         freq = panel->backlight.max;
 947         if (panel->backlight.combination_mode)
 948                 freq /= 0xff;
 949
 950         ctl = freq << 17;
 951         if (panel->backlight.combination_mode)
 952                 ctl |= BLM_LEGACY_MODE;
 953         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
 954                 ctl |= BLM_POLARITY_PNV;
 955
 956         I915_WRITE(BLC_PWM_CTL, ctl);
 957         POSTING_READ(BLC_PWM_CTL);
 958
 959         /* XXX: combine this into above write? */
 960         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 961
 962         /*
 963          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 964          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 965          * that has backlight.
 966          */
 967         if (IS_GEN2(dev_priv))
 968                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 969 }
 970
 971 static void i965_enable_backlight(struct intel_connector *connector)
 972 {
 973         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 974         struct intel_panel *panel = &connector->panel;
 975         enum pipe pipe = intel_get_pipe_from_connector(connector);
 976         u32 ctl, ctl2, freq;
 977
 978         ctl2 = I915_READ(BLC_PWM_CTL2);
 979         if (ctl2 & BLM_PWM_ENABLE) {
 980                 DRM_DEBUG_KMS("backlight already enabled\n");
 981                 ctl2 &= ~BLM_PWM_ENABLE;
 982                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 983         }
 984
 985         freq = panel->backlight.max;
 986         if (panel->backlight.combination_mode)
 987                 freq /= 0xff;
 988
 989         ctl = freq << 16;
 990         I915_WRITE(BLC_PWM_CTL, ctl);
 991
 992         ctl2 = BLM_PIPE(pipe);
 993         if (panel->backlight.combination_mode)
 994                 ctl2 |= BLM_COMBINATION_MODE;
 995         if (panel->backlight.active_low_pwm)
 996                 ctl2 |= BLM_POLARITY_I965;
 997         I915_WRITE(BLC_PWM_CTL2, ctl2);
 998         POSTING_READ(BLC_PWM_CTL2);
 999         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1000
1001         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1002 }
1003
1004 static void vlv_enable_backlight(struct intel_connector *connector)
1005 {
1006         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1007         struct intel_panel *panel = &connector->panel;
1008         enum pipe pipe = intel_get_pipe_from_connector(connector);
1009         u32 ctl, ctl2;
1010
1011         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1012                 return;
1013
1014         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1015         if (ctl2 & BLM_PWM_ENABLE) {
1016                 DRM_DEBUG_KMS("backlight already enabled\n");
1017                 ctl2 &= ~BLM_PWM_ENABLE;
1018                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1019         }
1020
1021         ctl = panel->backlight.max << 16;
1022         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1023
1024         /* XXX: combine this into above write? */
1025         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1026
1027         ctl2 = 0;
1028         if (panel->backlight.active_low_pwm)
1029                 ctl2 |= BLM_POLARITY_I965;
1030         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1031         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1032         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1033 }
1034
1035 static void bxt_enable_backlight(struct intel_connector *connector)
1036 {
1037         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1038         struct intel_panel *panel = &connector->panel;
1039         enum pipe pipe = intel_get_pipe_from_connector(connector);
1040         u32 pwm_ctl, val;
1041
1042         /* To use 2nd set of backlight registers, utility pin has to be
1043          * enabled with PWM mode.
1044          * The field should only be changed when the utility pin is disabled
1045          */
1046         if (panel->backlight.controller == 1) {
1047                 val = I915_READ(UTIL_PIN_CTL);
1048                 if (val & UTIL_PIN_ENABLE) {
1049                         DRM_DEBUG_KMS("util pin already enabled\n");
1050                         val &= ~UTIL_PIN_ENABLE;
1051                         I915_WRITE(UTIL_PIN_CTL, val);
1052                 }
1053
1054                 val = 0;
1055                 if (panel->backlight.util_pin_active_low)
1056                         val |= UTIL_PIN_POLARITY;
1057                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1058                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1059         }
1060
1061         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1062         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1063                 DRM_DEBUG_KMS("backlight already enabled\n");
1064                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1065                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1066                                 pwm_ctl);
1067         }
1068
1069         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1070                         panel->backlight.max);
1071
1072         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1073
1074         pwm_ctl = 0;
1075         if (panel->backlight.active_low_pwm)
1076                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1077
1078         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1079         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1080         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1081                         pwm_ctl | BXT_BLC_PWM_ENABLE);
1082 }
1083
1084 static void pwm_enable_backlight(struct intel_connector *connector)
1085 {
1086         struct intel_panel *panel = &connector->panel;
1087
1088         pwm_enable(panel->backlight.pwm);
1089         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1090 }
1091
1092 void intel_panel_enable_backlight(struct intel_connector *connector)
1093 {
1094         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1095         struct intel_panel *panel = &connector->panel;
1096         enum pipe pipe = intel_get_pipe_from_connector(connector);
1097
1098         if (!panel->backlight.present)
1099                 return;
1100
1101         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1102
1103         mutex_lock(&dev_priv->backlight_lock);
1104
1105         WARN_ON(panel->backlight.max == 0);
1106
1107         if (panel->backlight.level <= panel->backlight.min) {
1108                 panel->backlight.level = panel->backlight.max;
1109                 if (panel->backlight.device)
1110                         panel->backlight.device->props.brightness =
1111                                 scale_hw_to_user(connector,
1112                                                  panel->backlight.level,
1113                                                  panel->backlight.device->props.max_brightness);
1114         }
1115
1116         panel->backlight.enable(connector);
1117         panel->backlight.enabled = true;
1118         if (panel->backlight.device)
1119                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1120
1121         mutex_unlock(&dev_priv->backlight_lock);
1122 }
1123
1124 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1125 static int intel_backlight_device_update_status(struct backlight_device *bd)
1126 {
1127         struct intel_connector *connector = bl_get_data(bd);
1128         struct intel_panel *panel = &connector->panel;
1129         struct drm_device *dev = connector->base.dev;
1130
1131         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1132         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1133                       bd->props.brightness, bd->props.max_brightness);
1134         intel_panel_set_backlight(connector, bd->props.brightness,
1135                                   bd->props.max_brightness);
1136
1137         /*
1138          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1139          * backlight class device does not make it easy to to differentiate
1140          * between callbacks for brightness and bl_power, so our backlight_power
1141          * callback needs to take this into account.
1142          */
1143         if (panel->backlight.enabled) {
1144                 if (panel->backlight.power) {
1145                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1146                                 bd->props.brightness != 0;
1147                         panel->backlight.power(connector, enable);
1148                 }
1149         } else {
1150                 bd->props.power = FB_BLANK_POWERDOWN;
1151         }
1152
1153         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1154         return 0;
1155 }
1156
1157 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1158 {
1159         struct intel_connector *connector = bl_get_data(bd);
1160         struct drm_device *dev = connector->base.dev;
1161         struct drm_i915_private *dev_priv = to_i915(dev);
1162         u32 hw_level;
1163         int ret;
1164
1165         intel_runtime_pm_get(dev_priv);
1166         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1167
1168         hw_level = intel_panel_get_backlight(connector);
1169         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1170
1171         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1172         intel_runtime_pm_put(dev_priv);
1173
1174         return ret;
1175 }
1176
1177 static const struct backlight_ops intel_backlight_device_ops = {
1178         .update_status = intel_backlight_device_update_status,
1179         .get_brightness = intel_backlight_device_get_brightness,
1180 };
1181
1182 int intel_backlight_device_register(struct intel_connector *connector)
1183 {
1184         struct intel_panel *panel = &connector->panel;
1185         struct backlight_properties props;
1186
1187         if (WARN_ON(panel->backlight.device))
1188                 return -ENODEV;
1189
1190         if (!panel->backlight.present)
1191                 return 0;
1192
1193         WARN_ON(panel->backlight.max == 0);
1194
1195         memset(&props, 0, sizeof(props));
1196         props.type = BACKLIGHT_RAW;
1197
1198         /*
1199          * Note: Everything should work even if the backlight device max
1200          * presented to the userspace is arbitrarily chosen.
1201          */
1202         props.max_brightness = panel->backlight.max;
1203         props.brightness = scale_hw_to_user(connector,
1204                                             panel->backlight.level,
1205                                             props.max_brightness);
1206
1207         if (panel->backlight.enabled)
1208                 props.power = FB_BLANK_UNBLANK;
1209         else
1210                 props.power = FB_BLANK_POWERDOWN;
1211
1212         /*
1213          * Note: using the same name independent of the connector prevents
1214          * registration of multiple backlight devices in the driver.
1215          */
1216         panel->backlight.device =
1217                 backlight_device_register("intel_backlight",
1218                                           connector->base.kdev,
1219                                           connector,
1220                                           &intel_backlight_device_ops, &props);
1221
1222         if (IS_ERR(panel->backlight.device)) {
1223                 DRM_ERROR("Failed to register backlight: %ld\n",
1224                           PTR_ERR(panel->backlight.device));
1225                 panel->backlight.device = NULL;
1226                 return -ENODEV;
1227         }
1228
1229         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1230                       connector->base.name);
1231
1232         return 0;
1233 }
1234
1235 void intel_backlight_device_unregister(struct intel_connector *connector)
1236 {
1237         struct intel_panel *panel = &connector->panel;
1238
1239         if (panel->backlight.device) {
1240                 backlight_device_unregister(panel->backlight.device);
1241                 panel->backlight.device = NULL;
1242         }
1243 }
1244 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1245
1246 /*
1247  * BXT: PWM clock frequency = 19.2 MHz.
1248  */
1249 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1250 {
1251         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1252 }
1253
1254 /*
1255  * SPT: This value represents the period of the PWM stream in clock periods
1256  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1257  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1258  */
1259 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1260 {
1261         struct intel_panel *panel = &connector->panel;
1262         u32 mul;
1263
1264         if (panel->backlight.alternate_pwm_increment)
1265                 mul = 128;
1266         else
1267                 mul = 16;
1268
1269         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1270 }
1271
1272 /*
1273  * LPT: This value represents the period of the PWM stream in clock periods
1274  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1275  * LPT SOUTH_CHICKEN2 register bit 5).
1276  */
1277 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1278 {
1279         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1280         struct intel_panel *panel = &connector->panel;
1281         u32 mul, clock;
1282
1283         if (panel->backlight.alternate_pwm_increment)
1284                 mul = 16;
1285         else
1286                 mul = 128;
1287
1288         if (HAS_PCH_LPT_H(dev_priv))
1289                 clock = MHz(135); /* LPT:H */
1290         else
1291                 clock = MHz(24); /* LPT:LP */
1292
1293         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1294 }
1295
1296 /*
1297  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1298  * display raw clocks multiplied by 128.
1299  */
1300 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1301 {
1302         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1303
1304         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1305 }
1306
1307 /*
1308  * Gen2: This field determines the number of time base events (display core
1309  * clock frequency/32) in total for a complete cycle of modulated backlight
1310  * control.
1311  *
1312  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1313  * divided by 32.
1314  */
1315 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1316 {
1317         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1318         int clock;
1319
1320         if (IS_PINEVIEW(dev_priv))
1321                 clock = KHz(dev_priv->rawclk_freq);
1322         else
1323                 clock = KHz(dev_priv->cdclk_freq);
1324
1325         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1326 }
1327
1328 /*
1329  * Gen4: This value represents the period of the PWM stream in display core
1330  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1331  *
1332  */
1333 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1334 {
1335         struct drm_device *dev = connector->base.dev;
1336         struct drm_i915_private *dev_priv = to_i915(dev);
1337         int clock;
1338
1339         if (IS_G4X(dev_priv))
1340                 clock = KHz(dev_priv->rawclk_freq);
1341         else
1342                 clock = KHz(dev_priv->cdclk_freq);
1343
1344         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1345 }
1346
1347 /*
1348  * VLV: This value represents the period of the PWM stream in display core
1349  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1350  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1351  */
1352 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1353 {
1354         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1355         int mul, clock;
1356
1357         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1358                 if (IS_CHERRYVIEW(dev_priv))
1359                         clock = KHz(19200);
1360                 else
1361                         clock = MHz(25);
1362                 mul = 16;
1363         } else {
1364                 clock = KHz(dev_priv->rawclk_freq);
1365                 mul = 128;
1366         }
1367
1368         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1369 }
1370
1371 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1372 {
1373         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1374         struct intel_panel *panel = &connector->panel;
1375         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1376         u32 pwm;
1377
1378         if (!panel->backlight.hz_to_pwm) {
1379                 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1380                 return 0;
1381         }
1382
1383         if (pwm_freq_hz) {
1384                 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1385                               pwm_freq_hz);
1386         } else {
1387                 pwm_freq_hz = 200;
1388                 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1389                               pwm_freq_hz);
1390         }
1391
1392         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1393         if (!pwm) {
1394                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1395                 return 0;
1396         }
1397
1398         return pwm;
1399 }
1400
1401 /*
1402  * Note: The setup hooks can't assume pipe is set!
1403  */
1404 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1405 {
1406         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1407         struct intel_panel *panel = &connector->panel;
1408         int min;
1409
1410         WARN_ON(panel->backlight.max == 0);
1411
1412         /*
1413          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1414          * to problems. There are such machines out there. Either our
1415          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1416          * against this by letting the minimum be at most (arbitrarily chosen)
1417          * 25% of the max.
1418          */
1419         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1420         if (min != dev_priv->vbt.backlight.min_brightness) {
1421                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1422                               dev_priv->vbt.backlight.min_brightness, min);
1423         }
1424
1425         /* vbt value is a coefficient in range [0..255] */
1426         return scale(min, 0, 255, 0, panel->backlight.max);
1427 }
1428
1429 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1430 {
1431         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1432         struct intel_panel *panel = &connector->panel;
1433         u32 pch_ctl1, pch_ctl2, val;
1434         bool alt;
1435
1436         if (HAS_PCH_LPT(dev_priv))
1437                 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1438         else
1439                 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1440         panel->backlight.alternate_pwm_increment = alt;
1441
1442         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1443         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1444
1445         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1446         panel->backlight.max = pch_ctl2 >> 16;
1447
1448         if (!panel->backlight.max)
1449                 panel->backlight.max = get_backlight_max_vbt(connector);
1450
1451         if (!panel->backlight.max)
1452                 return -ENODEV;
1453
1454         panel->backlight.min = get_backlight_min_vbt(connector);
1455
1456         val = lpt_get_backlight(connector);
1457         val = intel_panel_compute_brightness(connector, val);
1458         panel->backlight.level = clamp(val, panel->backlight.min,
1459                                        panel->backlight.max);
1460
1461         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1462
1463         return 0;
1464 }
1465
1466 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1467 {
1468         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1469         struct intel_panel *panel = &connector->panel;
1470         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1471
1472         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1473         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1474
1475         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1476         panel->backlight.max = pch_ctl2 >> 16;
1477
1478         if (!panel->backlight.max)
1479                 panel->backlight.max = get_backlight_max_vbt(connector);
1480
1481         if (!panel->backlight.max)
1482                 return -ENODEV;
1483
1484         panel->backlight.min = get_backlight_min_vbt(connector);
1485
1486         val = pch_get_backlight(connector);
1487         val = intel_panel_compute_brightness(connector, val);
1488         panel->backlight.level = clamp(val, panel->backlight.min,
1489                                        panel->backlight.max);
1490
1491         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1492         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1493                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1494
1495         return 0;
1496 }
1497
1498 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1499 {
1500         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1501         struct intel_panel *panel = &connector->panel;
1502         u32 ctl, val;
1503
1504         ctl = I915_READ(BLC_PWM_CTL);
1505
1506         if (IS_GEN2(dev_priv) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1507                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1508
1509         if (IS_PINEVIEW(dev_priv))
1510                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1511
1512         panel->backlight.max = ctl >> 17;
1513
1514         if (!panel->backlight.max) {
1515                 panel->backlight.max = get_backlight_max_vbt(connector);
1516                 panel->backlight.max >>= 1;
1517         }
1518
1519         if (!panel->backlight.max)
1520                 return -ENODEV;
1521
1522         if (panel->backlight.combination_mode)
1523                 panel->backlight.max *= 0xff;
1524
1525         panel->backlight.min = get_backlight_min_vbt(connector);
1526
1527         val = i9xx_get_backlight(connector);
1528         val = intel_panel_compute_brightness(connector, val);
1529         panel->backlight.level = clamp(val, panel->backlight.min,
1530                                        panel->backlight.max);
1531
1532         panel->backlight.enabled = val != 0;
1533
1534         return 0;
1535 }
1536
1537 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1538 {
1539         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1540         struct intel_panel *panel = &connector->panel;
1541         u32 ctl, ctl2, val;
1542
1543         ctl2 = I915_READ(BLC_PWM_CTL2);
1544         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1545         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1546
1547         ctl = I915_READ(BLC_PWM_CTL);
1548         panel->backlight.max = ctl >> 16;
1549
1550         if (!panel->backlight.max)
1551                 panel->backlight.max = get_backlight_max_vbt(connector);
1552
1553         if (!panel->backlight.max)
1554                 return -ENODEV;
1555
1556         if (panel->backlight.combination_mode)
1557                 panel->backlight.max *= 0xff;
1558
1559         panel->backlight.min = get_backlight_min_vbt(connector);
1560
1561         val = i9xx_get_backlight(connector);
1562         val = intel_panel_compute_brightness(connector, val);
1563         panel->backlight.level = clamp(val, panel->backlight.min,
1564                                        panel->backlight.max);
1565
1566         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1567
1568         return 0;
1569 }
1570
1571 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1572 {
1573         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1574         struct intel_panel *panel = &connector->panel;
1575         u32 ctl, ctl2, val;
1576
1577         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1578                 return -ENODEV;
1579
1580         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1581         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1582
1583         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1584         panel->backlight.max = ctl >> 16;
1585
1586         if (!panel->backlight.max)
1587                 panel->backlight.max = get_backlight_max_vbt(connector);
1588
1589         if (!panel->backlight.max)
1590                 return -ENODEV;
1591
1592         panel->backlight.min = get_backlight_min_vbt(connector);
1593
1594         val = _vlv_get_backlight(dev_priv, pipe);
1595         val = intel_panel_compute_brightness(connector, val);
1596         panel->backlight.level = clamp(val, panel->backlight.min,
1597                                        panel->backlight.max);
1598
1599         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1600
1601         return 0;
1602 }
1603
1604 static int
1605 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1606 {
1607         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1608         struct intel_panel *panel = &connector->panel;
1609         u32 pwm_ctl, val;
1610
1611         /*
1612          * For BXT hard coding the Backlight controller to 0.
1613          * TODO : Read the controller value from VBT and generalize
1614          */
1615         panel->backlight.controller = 0;
1616
1617         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1618
1619         /* Keeping the check if controller 1 is to be programmed.
1620          * This will come into affect once the VBT parsing
1621          * is fixed for controller selection, and controller 1 is used
1622          * for a prticular display configuration.
1623          */
1624         if (panel->backlight.controller == 1) {
1625                 val = I915_READ(UTIL_PIN_CTL);
1626                 panel->backlight.util_pin_active_low =
1627                                         val & UTIL_PIN_POLARITY;
1628         }
1629
1630         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1631         panel->backlight.max =
1632                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1633
1634         if (!panel->backlight.max)
1635                 panel->backlight.max = get_backlight_max_vbt(connector);
1636
1637         if (!panel->backlight.max)
1638                 return -ENODEV;
1639
1640         val = bxt_get_backlight(connector);
1641         val = intel_panel_compute_brightness(connector, val);
1642         panel->backlight.level = clamp(val, panel->backlight.min,
1643                                        panel->backlight.max);
1644
1645         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1646
1647         return 0;
1648 }
1649
1650 static int pwm_setup_backlight(struct intel_connector *connector,
1651                                enum pipe pipe)
1652 {
1653         struct drm_device *dev = connector->base.dev;
1654         struct intel_panel *panel = &connector->panel;
1655         int retval;
1656
1657         /* Get the PWM chip for backlight control */
1658         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1659         if (IS_ERR(panel->backlight.pwm)) {
1660                 DRM_ERROR("Failed to own the pwm chip\n");
1661                 panel->backlight.pwm = NULL;
1662                 return -ENODEV;
1663         }
1664
1665         /*
1666          * FIXME: pwm_apply_args() should be removed when switching to
1667          * the atomic PWM API.
1668          */
1669         pwm_apply_args(panel->backlight.pwm);
1670
1671         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1672                             CRC_PMIC_PWM_PERIOD_NS);
1673         if (retval < 0) {
1674                 DRM_ERROR("Failed to configure the pwm chip\n");
1675                 pwm_put(panel->backlight.pwm);
1676                 panel->backlight.pwm = NULL;
1677                 return retval;
1678         }
1679
1680         panel->backlight.min = 0; /* 0% */
1681         panel->backlight.max = 100; /* 100% */
1682         panel->backlight.level = DIV_ROUND_UP(
1683                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1684                                  CRC_PMIC_PWM_PERIOD_NS);
1685         panel->backlight.enabled = panel->backlight.level != 0;
1686
1687         return 0;
1688 }
1689
1690 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1691 {
1692         struct drm_i915_private *dev_priv = to_i915(connector->dev);
1693         struct intel_connector *intel_connector = to_intel_connector(connector);
1694         struct intel_panel *panel = &intel_connector->panel;
1695         int ret;
1696
1697         if (!dev_priv->vbt.backlight.present) {
1698                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1699                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1700                 } else {
1701                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1702                         return 0;
1703                 }
1704         }
1705
1706         /* ensure intel_panel has been initialized first */
1707         if (WARN_ON(!panel->backlight.setup))
1708                 return -ENODEV;
1709
1710         /* set level and max in panel struct */
1711         mutex_lock(&dev_priv->backlight_lock);
1712         ret = panel->backlight.setup(intel_connector, pipe);
1713         mutex_unlock(&dev_priv->backlight_lock);
1714
1715         if (ret) {
1716                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1717                               connector->name);
1718                 return ret;
1719         }
1720
1721         panel->backlight.present = true;
1722
1723         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1724                       connector->name,
1725                       enableddisabled(panel->backlight.enabled),
1726                       panel->backlight.level, panel->backlight.max);
1727
1728         return 0;
1729 }
1730
1731 void intel_panel_destroy_backlight(struct drm_connector *connector)
1732 {
1733         struct intel_connector *intel_connector = to_intel_connector(connector);
1734         struct intel_panel *panel = &intel_connector->panel;
1735
1736         /* dispose of the pwm */
1737         if (panel->backlight.pwm)
1738                 pwm_put(panel->backlight.pwm);
1739
1740         panel->backlight.present = false;
1741 }
1742
1743 /* Set up chip specific backlight functions */
1744 static void
1745 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1746 {
1747         struct intel_connector *connector =
1748                 container_of(panel, struct intel_connector, panel);
1749         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1750
1751         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1752             intel_dp_aux_init_backlight_funcs(connector) == 0)
1753                 return;
1754
1755         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1756             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1757                 return;
1758
1759         if (IS_BROXTON(dev_priv)) {
1760                 panel->backlight.setup = bxt_setup_backlight;
1761                 panel->backlight.enable = bxt_enable_backlight;
1762                 panel->backlight.disable = bxt_disable_backlight;
1763                 panel->backlight.set = bxt_set_backlight;
1764                 panel->backlight.get = bxt_get_backlight;
1765                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1766         } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
1767                    HAS_PCH_KBP(dev_priv)) {
1768                 panel->backlight.setup = lpt_setup_backlight;
1769                 panel->backlight.enable = lpt_enable_backlight;
1770                 panel->backlight.disable = lpt_disable_backlight;
1771                 panel->backlight.set = lpt_set_backlight;
1772                 panel->backlight.get = lpt_get_backlight;
1773                 if (HAS_PCH_LPT(dev_priv))
1774                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1775                 else
1776                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1777         } else if (HAS_PCH_SPLIT(dev_priv)) {
1778                 panel->backlight.setup = pch_setup_backlight;
1779                 panel->backlight.enable = pch_enable_backlight;
1780                 panel->backlight.disable = pch_disable_backlight;
1781                 panel->backlight.set = pch_set_backlight;
1782                 panel->backlight.get = pch_get_backlight;
1783                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1784         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1785                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1786                         panel->backlight.setup = pwm_setup_backlight;
1787                         panel->backlight.enable = pwm_enable_backlight;
1788                         panel->backlight.disable = pwm_disable_backlight;
1789                         panel->backlight.set = pwm_set_backlight;
1790                         panel->backlight.get = pwm_get_backlight;
1791                 } else {
1792                         panel->backlight.setup = vlv_setup_backlight;
1793                         panel->backlight.enable = vlv_enable_backlight;
1794                         panel->backlight.disable = vlv_disable_backlight;
1795                         panel->backlight.set = vlv_set_backlight;
1796                         panel->backlight.get = vlv_get_backlight;
1797                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1798                 }
1799         } else if (IS_GEN4(dev_priv)) {
1800                 panel->backlight.setup = i965_setup_backlight;
1801                 panel->backlight.enable = i965_enable_backlight;
1802                 panel->backlight.disable = i965_disable_backlight;
1803                 panel->backlight.set = i9xx_set_backlight;
1804                 panel->backlight.get = i9xx_get_backlight;
1805                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1806         } else {
1807                 panel->backlight.setup = i9xx_setup_backlight;
1808                 panel->backlight.enable = i9xx_enable_backlight;
1809                 panel->backlight.disable = i9xx_disable_backlight;
1810                 panel->backlight.set = i9xx_set_backlight;
1811                 panel->backlight.get = i9xx_get_backlight;
1812                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1813         }
1814 }
1815
1816 int intel_panel_init(struct intel_panel *panel,
1817                      struct drm_display_mode *fixed_mode,
1818                      struct drm_display_mode *downclock_mode)
1819 {
1820         intel_panel_init_backlight_funcs(panel);
1821
1822         panel->fixed_mode = fixed_mode;
1823         panel->downclock_mode = downclock_mode;
1824
1825         return 0;
1826 }
1827
1828 void intel_panel_fini(struct intel_panel *panel)
1829 {
1830         struct intel_connector *intel_connector =
1831                 container_of(panel, struct intel_connector, panel);
1832
1833         if (panel->fixed_mode)
1834                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1835
1836         if (panel->downclock_mode)
1837                 drm_mode_destroy(intel_connector->base.dev,
1838                                 panel->downclock_mode);
1839 }