drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/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_priv: i915 device instance
  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_i915_private *dev_priv,
  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_priv->drm, 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             !pipe_config->ycbcr420)
 115                 goto done;
 116
 117         switch (fitting_mode) {
 118         case DRM_MODE_SCALE_CENTER:
 119                 width = pipe_config->pipe_src_w;
 120                 height = pipe_config->pipe_src_h;
 121                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 122                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 123                 break;
 124
 125         case DRM_MODE_SCALE_ASPECT:
 126                 /* Scale but preserve the aspect ratio */
 127                 {
 128                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 129                                 * pipe_config->pipe_src_h;
 130                         u32 scaled_height = pipe_config->pipe_src_w
 131                                 * adjusted_mode->crtc_vdisplay;
 132                         if (scaled_width > scaled_height) { /* pillar */
 133                                 width = scaled_height / pipe_config->pipe_src_h;
 134                                 if (width & 1)
 135                                         width++;
 136                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 137                                 y = 0;
 138                                 height = adjusted_mode->crtc_vdisplay;
 139                         } else if (scaled_width < scaled_height) { /* letter */
 140                                 height = scaled_width / pipe_config->pipe_src_w;
 141                                 if (height & 1)
 142                                     height++;
 143                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 144                                 x = 0;
 145                                 width = adjusted_mode->crtc_hdisplay;
 146                         } else {
 147                                 x = y = 0;
 148                                 width = adjusted_mode->crtc_hdisplay;
 149                                 height = adjusted_mode->crtc_vdisplay;
 150                         }
 151                 }
 152                 break;
 153
 154         case DRM_MODE_SCALE_FULLSCREEN:
 155                 x = y = 0;
 156                 width = adjusted_mode->crtc_hdisplay;
 157                 height = adjusted_mode->crtc_vdisplay;
 158                 break;
 159
 160         default:
 161                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 162                 return;
 163         }
 164
 165 done:
 166         pipe_config->pch_pfit.pos = (x << 16) | y;
 167         pipe_config->pch_pfit.size = (width << 16) | height;
 168         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 169 }
 170
 171 static void
 172 centre_horizontally(struct drm_display_mode *adjusted_mode,
 173                     int width)
 174 {
 175         u32 border, sync_pos, blank_width, sync_width;
 176
 177         /* keep the hsync and hblank widths constant */
 178         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 179         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 180         sync_pos = (blank_width - sync_width + 1) / 2;
 181
 182         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 183         border += border & 1; /* make the border even */
 184
 185         adjusted_mode->crtc_hdisplay = width;
 186         adjusted_mode->crtc_hblank_start = width + border;
 187         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 188
 189         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 190         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 191 }
 192
 193 static void
 194 centre_vertically(struct drm_display_mode *adjusted_mode,
 195                   int height)
 196 {
 197         u32 border, sync_pos, blank_width, sync_width;
 198
 199         /* keep the vsync and vblank widths constant */
 200         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 201         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 202         sync_pos = (blank_width - sync_width + 1) / 2;
 203
 204         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 205
 206         adjusted_mode->crtc_vdisplay = height;
 207         adjusted_mode->crtc_vblank_start = height + border;
 208         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 209
 210         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 211         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 212 }
 213
 214 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 215 {
 216         /*
 217          * Floating point operation is not supported. So the FACTOR
 218          * is defined, which can avoid the floating point computation
 219          * when calculating the panel ratio.
 220          */
 221 #define ACCURACY 12
 222 #define FACTOR (1 << ACCURACY)
 223         u32 ratio = source * FACTOR / target;
 224         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 225 }
 226
 227 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 228                               u32 *pfit_control)
 229 {
 230         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 231         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 232                 pipe_config->pipe_src_h;
 233         u32 scaled_height = pipe_config->pipe_src_w *
 234                 adjusted_mode->crtc_vdisplay;
 235
 236         /* 965+ is easy, it does everything in hw */
 237         if (scaled_width > scaled_height)
 238                 *pfit_control |= PFIT_ENABLE |
 239                         PFIT_SCALING_PILLAR;
 240         else if (scaled_width < scaled_height)
 241                 *pfit_control |= PFIT_ENABLE |
 242                         PFIT_SCALING_LETTER;
 243         else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 244                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 245 }
 246
 247 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 248                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 249                               u32 *border)
 250 {
 251         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 252         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 253                 pipe_config->pipe_src_h;
 254         u32 scaled_height = pipe_config->pipe_src_w *
 255                 adjusted_mode->crtc_vdisplay;
 256         u32 bits;
 257
 258         /*
 259          * For earlier chips we have to calculate the scaling
 260          * ratio by hand and program it into the
 261          * PFIT_PGM_RATIO register
 262          */
 263         if (scaled_width > scaled_height) { /* pillar */
 264                 centre_horizontally(adjusted_mode,
 265                                     scaled_height /
 266                                     pipe_config->pipe_src_h);
 267
 268                 *border = LVDS_BORDER_ENABLE;
 269                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 270                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 271                                                     adjusted_mode->crtc_vdisplay);
 272
 273                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 274                                              bits << PFIT_VERT_SCALE_SHIFT);
 275                         *pfit_control |= (PFIT_ENABLE |
 276                                           VERT_INTERP_BILINEAR |
 277                                           HORIZ_INTERP_BILINEAR);
 278                 }
 279         } else if (scaled_width < scaled_height) { /* letter */
 280                 centre_vertically(adjusted_mode,
 281                                   scaled_width /
 282                                   pipe_config->pipe_src_w);
 283
 284                 *border = LVDS_BORDER_ENABLE;
 285                 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 286                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 287                                                     adjusted_mode->crtc_hdisplay);
 288
 289                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 290                                              bits << PFIT_VERT_SCALE_SHIFT);
 291                         *pfit_control |= (PFIT_ENABLE |
 292                                           VERT_INTERP_BILINEAR |
 293                                           HORIZ_INTERP_BILINEAR);
 294                 }
 295         } else {
 296                 /* Aspects match, Let hw scale both directions */
 297                 *pfit_control |= (PFIT_ENABLE |
 298                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 299                                   VERT_INTERP_BILINEAR |
 300                                   HORIZ_INTERP_BILINEAR);
 301         }
 302 }
 303
 304 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 305                               struct intel_crtc_state *pipe_config,
 306                               int fitting_mode)
 307 {
 308         struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
 309         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 310         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 311
 312         /* Native modes don't need fitting */
 313         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 314             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 315                 goto out;
 316
 317         switch (fitting_mode) {
 318         case DRM_MODE_SCALE_CENTER:
 319                 /*
 320                  * For centered modes, we have to calculate border widths &
 321                  * heights and modify the values programmed into the CRTC.
 322                  */
 323                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 324                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 325                 border = LVDS_BORDER_ENABLE;
 326                 break;
 327         case DRM_MODE_SCALE_ASPECT:
 328                 /* Scale but preserve the aspect ratio */
 329                 if (INTEL_GEN(dev_priv) >= 4)
 330                         i965_scale_aspect(pipe_config, &pfit_control);
 331                 else
 332                         i9xx_scale_aspect(pipe_config, &pfit_control,
 333                                           &pfit_pgm_ratios, &border);
 334                 break;
 335         case DRM_MODE_SCALE_FULLSCREEN:
 336                 /*
 337                  * Full scaling, even if it changes the aspect ratio.
 338                  * Fortunately this is all done for us in hw.
 339                  */
 340                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 341                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 342                         pfit_control |= PFIT_ENABLE;
 343                         if (INTEL_GEN(dev_priv) >= 4)
 344                                 pfit_control |= PFIT_SCALING_AUTO;
 345                         else
 346                                 pfit_control |= (VERT_AUTO_SCALE |
 347                                                  VERT_INTERP_BILINEAR |
 348                                                  HORIZ_AUTO_SCALE |
 349                                                  HORIZ_INTERP_BILINEAR);
 350                 }
 351                 break;
 352         default:
 353                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 354                 return;
 355         }
 356
 357         /* 965+ wants fuzzy fitting */
 358         /* FIXME: handle multiple panels by failing gracefully */
 359         if (INTEL_GEN(dev_priv) >= 4)
 360                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 361                                  PFIT_FILTER_FUZZY);
 362
 363 out:
 364         if ((pfit_control & PFIT_ENABLE) == 0) {
 365                 pfit_control = 0;
 366                 pfit_pgm_ratios = 0;
 367         }
 368
 369         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 370         if (INTEL_GEN(dev_priv) < 4 && pipe_config->pipe_bpp == 18)
 371                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 372
 373         pipe_config->gmch_pfit.control = pfit_control;
 374         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 375         pipe_config->gmch_pfit.lvds_border_bits = border;
 376 }
 377
 378 enum drm_connector_status
 379 intel_panel_detect(struct drm_i915_private *dev_priv)
 380 {
 381         /* Assume that the BIOS does not lie through the OpRegion... */
 382         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 383                 return *dev_priv->opregion.lid_state & 0x1 ?
 384                         connector_status_connected :
 385                         connector_status_disconnected;
 386         }
 387
 388         switch (i915.panel_ignore_lid) {
 389         case -2:
 390                 return connector_status_connected;
 391         case -1:
 392                 return connector_status_disconnected;
 393         default:
 394                 return connector_status_unknown;
 395         }
 396 }
 397
 398 /**
 399  * scale - scale values from one range to another
 400  *
 401  * @source_val: value in range [@source_min..@source_max]
 402  *
 403  * Return @source_val in range [@source_min..@source_max] scaled to range
 404  * [@target_min..@target_max].
 405  */
 406 static uint32_t scale(uint32_t source_val,
 407                       uint32_t source_min, uint32_t source_max,
 408                       uint32_t target_min, uint32_t target_max)
 409 {
 410         uint64_t target_val;
 411
 412         WARN_ON(source_min > source_max);
 413         WARN_ON(target_min > target_max);
 414
 415         /* defensive */
 416         source_val = clamp(source_val, source_min, source_max);
 417
 418         /* avoid overflows */
 419         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 420                         (target_max - target_min), source_max - source_min);
 421         target_val += target_min;
 422
 423         return target_val;
 424 }
 425
 426 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 427 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 428                                    u32 user_level, u32 user_max)
 429 {
 430         struct intel_panel *panel = &connector->panel;
 431
 432         return scale(user_level, 0, user_max,
 433                      panel->backlight.min, panel->backlight.max);
 434 }
 435
 436 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 437  * to [hw_min..hw_max]. */
 438 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 439                                    u32 user_level, u32 user_max)
 440 {
 441         struct intel_panel *panel = &connector->panel;
 442         u32 hw_level;
 443
 444         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 445         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 446
 447         return hw_level;
 448 }
 449
 450 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 451 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 452                                    u32 hw_level, u32 user_max)
 453 {
 454         struct intel_panel *panel = &connector->panel;
 455
 456         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 457                      0, user_max);
 458 }
 459
 460 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 461                                           u32 val)
 462 {
 463         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 464         struct intel_panel *panel = &connector->panel;
 465
 466         WARN_ON(panel->backlight.max == 0);
 467
 468         if (i915.invert_brightness < 0)
 469                 return val;
 470
 471         if (i915.invert_brightness > 0 ||
 472             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 473                 return panel->backlight.max - val + panel->backlight.min;
 474         }
 475
 476         return val;
 477 }
 478
 479 static u32 lpt_get_backlight(struct intel_connector *connector)
 480 {
 481         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 482
 483         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 484 }
 485
 486 static u32 pch_get_backlight(struct intel_connector *connector)
 487 {
 488         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 489
 490         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 491 }
 492
 493 static u32 i9xx_get_backlight(struct intel_connector *connector)
 494 {
 495         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 496         struct intel_panel *panel = &connector->panel;
 497         u32 val;
 498
 499         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 500         if (INTEL_INFO(dev_priv)->gen < 4)
 501                 val >>= 1;
 502
 503         if (panel->backlight.combination_mode) {
 504                 u8 lbpc;
 505
 506                 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
 507                 val *= lbpc;
 508         }
 509
 510         return val;
 511 }
 512
 513 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
 514 {
 515         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 516                 return 0;
 517
 518         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 519 }
 520
 521 static u32 vlv_get_backlight(struct intel_connector *connector)
 522 {
 523         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 524         enum pipe pipe = intel_get_pipe_from_connector(connector);
 525
 526         return _vlv_get_backlight(dev_priv, pipe);
 527 }
 528
 529 static u32 bxt_get_backlight(struct intel_connector *connector)
 530 {
 531         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 532         struct intel_panel *panel = &connector->panel;
 533
 534         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 535 }
 536
 537 static u32 pwm_get_backlight(struct intel_connector *connector)
 538 {
 539         struct intel_panel *panel = &connector->panel;
 540         int duty_ns;
 541
 542         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 543         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 544 }
 545
 546 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 547 {
 548         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 549         struct intel_panel *panel = &connector->panel;
 550         u32 val = 0;
 551
 552         mutex_lock(&dev_priv->backlight_lock);
 553
 554         if (panel->backlight.enabled) {
 555                 val = panel->backlight.get(connector);
 556                 val = intel_panel_compute_brightness(connector, val);
 557         }
 558
 559         mutex_unlock(&dev_priv->backlight_lock);
 560
 561         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 562         return val;
 563 }
 564
 565 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 566 {
 567         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 568         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 569
 570         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 571         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 572 }
 573
 574 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 575 {
 576         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 577         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 578         u32 tmp;
 579
 580         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 581         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 582 }
 583
 584 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 585 {
 586         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 587         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 588         struct intel_panel *panel = &connector->panel;
 589         u32 tmp, mask;
 590
 591         WARN_ON(panel->backlight.max == 0);
 592
 593         if (panel->backlight.combination_mode) {
 594                 u8 lbpc;
 595
 596                 lbpc = level * 0xfe / panel->backlight.max + 1;
 597                 level /= lbpc;
 598                 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
 599         }
 600
 601         if (IS_GEN4(dev_priv)) {
 602                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 603         } else {
 604                 level <<= 1;
 605                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 606         }
 607
 608         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 609         I915_WRITE(BLC_PWM_CTL, tmp | level);
 610 }
 611
 612 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 613 {
 614         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 615         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 616         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 617         u32 tmp;
 618
 619         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 620         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 621 }
 622
 623 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 624 {
 625         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 626         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 627         struct intel_panel *panel = &connector->panel;
 628
 629         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 630 }
 631
 632 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 633 {
 634         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 635         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 636
 637         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 638 }
 639
 640 static void
 641 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 642 {
 643         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 644         struct intel_panel *panel = &connector->panel;
 645
 646         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 647
 648         level = intel_panel_compute_brightness(connector, level);
 649         panel->backlight.set(conn_state, level);
 650 }
 651
 652 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 653 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
 654                                       u32 user_level, u32 user_max)
 655 {
 656         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 657         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 658         struct intel_panel *panel = &connector->panel;
 659         u32 hw_level;
 660
 661         if (!panel->backlight.present)
 662                 return;
 663
 664         mutex_lock(&dev_priv->backlight_lock);
 665
 666         WARN_ON(panel->backlight.max == 0);
 667
 668         hw_level = scale_user_to_hw(connector, user_level, user_max);
 669         panel->backlight.level = hw_level;
 670
 671         if (panel->backlight.enabled)
 672                 intel_panel_actually_set_backlight(conn_state, hw_level);
 673
 674         mutex_unlock(&dev_priv->backlight_lock);
 675 }
 676
 677 /* set backlight brightness to level in range [0..max], assuming hw min is
 678  * respected.
 679  */
 680 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 681                                     u32 user_level, u32 user_max)
 682 {
 683         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 684         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 685         struct intel_panel *panel = &connector->panel;
 686         u32 hw_level;
 687
 688         /*
 689          * Lack of crtc may occur during driver init because
 690          * connection_mutex isn't held across the entire backlight
 691          * setup + modeset readout, and the BIOS can issue the
 692          * requests at any time.
 693          */
 694         if (!panel->backlight.present || !conn_state->crtc)
 695                 return;
 696
 697         mutex_lock(&dev_priv->backlight_lock);
 698
 699         WARN_ON(panel->backlight.max == 0);
 700
 701         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 702         panel->backlight.level = hw_level;
 703
 704         if (panel->backlight.device)
 705                 panel->backlight.device->props.brightness =
 706                         scale_hw_to_user(connector,
 707                                          panel->backlight.level,
 708                                          panel->backlight.device->props.max_brightness);
 709
 710         if (panel->backlight.enabled)
 711                 intel_panel_actually_set_backlight(conn_state, hw_level);
 712
 713         mutex_unlock(&dev_priv->backlight_lock);
 714 }
 715
 716 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
 717 {
 718         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 719         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 720         u32 tmp;
 721
 722         intel_panel_actually_set_backlight(old_conn_state, 0);
 723
 724         /*
 725          * Although we don't support or enable CPU PWM with LPT/SPT based
 726          * systems, it may have been enabled prior to loading the
 727          * driver. Disable to avoid warnings on LCPLL disable.
 728          *
 729          * This needs rework if we need to add support for CPU PWM on PCH split
 730          * platforms.
 731          */
 732         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 733         if (tmp & BLM_PWM_ENABLE) {
 734                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
 735                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 736         }
 737
 738         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 739         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 740 }
 741
 742 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
 743 {
 744         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 745         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 746         u32 tmp;
 747
 748         intel_panel_actually_set_backlight(old_conn_state, 0);
 749
 750         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 751         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 752
 753         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 754         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 755 }
 756
 757 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
 758 {
 759         intel_panel_actually_set_backlight(old_conn_state, 0);
 760 }
 761
 762 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
 763 {
 764         struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 765         u32 tmp;
 766
 767         intel_panel_actually_set_backlight(old_conn_state, 0);
 768
 769         tmp = I915_READ(BLC_PWM_CTL2);
 770         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 771 }
 772
 773 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
 774 {
 775         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 776         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 777         enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 778         u32 tmp;
 779
 780         intel_panel_actually_set_backlight(old_conn_state, 0);
 781
 782         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 783         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 784 }
 785
 786 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
 787 {
 788         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 789         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 790         struct intel_panel *panel = &connector->panel;
 791         u32 tmp, val;
 792
 793         intel_panel_actually_set_backlight(old_conn_state, 0);
 794
 795         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 796         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 797                         tmp & ~BXT_BLC_PWM_ENABLE);
 798
 799         if (panel->backlight.controller == 1) {
 800                 val = I915_READ(UTIL_PIN_CTL);
 801                 val &= ~UTIL_PIN_ENABLE;
 802                 I915_WRITE(UTIL_PIN_CTL, val);
 803         }
 804 }
 805
 806 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
 807 {
 808         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 809         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 810         struct intel_panel *panel = &connector->panel;
 811         u32 tmp;
 812
 813         intel_panel_actually_set_backlight(old_conn_state, 0);
 814
 815         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 816         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 817                    tmp & ~BXT_BLC_PWM_ENABLE);
 818 }
 819
 820 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
 821 {
 822         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 823         struct intel_panel *panel = &connector->panel;
 824
 825         /* Disable the backlight */
 826         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 827         usleep_range(2000, 3000);
 828         pwm_disable(panel->backlight.pwm);
 829 }
 830
 831 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
 832 {
 833         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 834         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 835         struct intel_panel *panel = &connector->panel;
 836
 837         if (!panel->backlight.present)
 838                 return;
 839
 840         /*
 841          * Do not disable backlight on the vga_switcheroo path. When switching
 842          * away from i915, the other client may depend on i915 to handle the
 843          * backlight. This will leave the backlight on unnecessarily when
 844          * another client is not activated.
 845          */
 846         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 847                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 848                 return;
 849         }
 850
 851         mutex_lock(&dev_priv->backlight_lock);
 852
 853         if (panel->backlight.device)
 854                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 855         panel->backlight.enabled = false;
 856         panel->backlight.disable(old_conn_state);
 857
 858         mutex_unlock(&dev_priv->backlight_lock);
 859 }
 860
 861 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 862                                  const struct drm_connector_state *conn_state)
 863 {
 864         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 865         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 866         struct intel_panel *panel = &connector->panel;
 867         u32 pch_ctl1, pch_ctl2, schicken;
 868
 869         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 870         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 871                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 872                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 873                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 874         }
 875
 876         if (HAS_PCH_LPT(dev_priv)) {
 877                 schicken = I915_READ(SOUTH_CHICKEN2);
 878                 if (panel->backlight.alternate_pwm_increment)
 879                         schicken |= LPT_PWM_GRANULARITY;
 880                 else
 881                         schicken &= ~LPT_PWM_GRANULARITY;
 882                 I915_WRITE(SOUTH_CHICKEN2, schicken);
 883         } else {
 884                 schicken = I915_READ(SOUTH_CHICKEN1);
 885                 if (panel->backlight.alternate_pwm_increment)
 886                         schicken |= SPT_PWM_GRANULARITY;
 887                 else
 888                         schicken &= ~SPT_PWM_GRANULARITY;
 889                 I915_WRITE(SOUTH_CHICKEN1, schicken);
 890         }
 891
 892         pch_ctl2 = panel->backlight.max << 16;
 893         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 894
 895         pch_ctl1 = 0;
 896         if (panel->backlight.active_low_pwm)
 897                 pch_ctl1 |= BLM_PCH_POLARITY;
 898
 899         /* After LPT, override is the default. */
 900         if (HAS_PCH_LPT(dev_priv))
 901                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 902
 903         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 904         POSTING_READ(BLC_PWM_PCH_CTL1);
 905         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 906
 907         /* This won't stick until the above enable. */
 908         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 909 }
 910
 911 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 912                                  const struct drm_connector_state *conn_state)
 913 {
 914         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 915         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 916         struct intel_panel *panel = &connector->panel;
 917         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 918         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 919
 920         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 921         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 922                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 923                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 924                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 925         }
 926
 927         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 928         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 929                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 930                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 931                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 932         }
 933
 934         if (cpu_transcoder == TRANSCODER_EDP)
 935                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 936         else
 937                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 938         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 939         POSTING_READ(BLC_PWM_CPU_CTL2);
 940         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 941
 942         /* This won't stick until the above enable. */
 943         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 944
 945         pch_ctl2 = panel->backlight.max << 16;
 946         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 947
 948         pch_ctl1 = 0;
 949         if (panel->backlight.active_low_pwm)
 950                 pch_ctl1 |= BLM_PCH_POLARITY;
 951
 952         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 953         POSTING_READ(BLC_PWM_PCH_CTL1);
 954         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 955 }
 956
 957 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
 958                                   const struct drm_connector_state *conn_state)
 959 {
 960         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 961         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 962         struct intel_panel *panel = &connector->panel;
 963         u32 ctl, freq;
 964
 965         ctl = I915_READ(BLC_PWM_CTL);
 966         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 967                 DRM_DEBUG_KMS("backlight already enabled\n");
 968                 I915_WRITE(BLC_PWM_CTL, 0);
 969         }
 970
 971         freq = panel->backlight.max;
 972         if (panel->backlight.combination_mode)
 973                 freq /= 0xff;
 974
 975         ctl = freq << 17;
 976         if (panel->backlight.combination_mode)
 977                 ctl |= BLM_LEGACY_MODE;
 978         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
 979                 ctl |= BLM_POLARITY_PNV;
 980
 981         I915_WRITE(BLC_PWM_CTL, ctl);
 982         POSTING_READ(BLC_PWM_CTL);
 983
 984         /* XXX: combine this into above write? */
 985         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 986
 987         /*
 988          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 989          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 990          * that has backlight.
 991          */
 992         if (IS_GEN2(dev_priv))
 993                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 994 }
 995
 996 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
 997                                   const struct drm_connector_state *conn_state)
 998 {
 999         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1000         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1001         struct intel_panel *panel = &connector->panel;
1002         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1003         u32 ctl, ctl2, freq;
1004
1005         ctl2 = I915_READ(BLC_PWM_CTL2);
1006         if (ctl2 & BLM_PWM_ENABLE) {
1007                 DRM_DEBUG_KMS("backlight already enabled\n");
1008                 ctl2 &= ~BLM_PWM_ENABLE;
1009                 I915_WRITE(BLC_PWM_CTL2, ctl2);
1010         }
1011
1012         freq = panel->backlight.max;
1013         if (panel->backlight.combination_mode)
1014                 freq /= 0xff;
1015
1016         ctl = freq << 16;
1017         I915_WRITE(BLC_PWM_CTL, ctl);
1018
1019         ctl2 = BLM_PIPE(pipe);
1020         if (panel->backlight.combination_mode)
1021                 ctl2 |= BLM_COMBINATION_MODE;
1022         if (panel->backlight.active_low_pwm)
1023                 ctl2 |= BLM_POLARITY_I965;
1024         I915_WRITE(BLC_PWM_CTL2, ctl2);
1025         POSTING_READ(BLC_PWM_CTL2);
1026         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1027
1028         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1029 }
1030
1031 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1032                                  const struct drm_connector_state *conn_state)
1033 {
1034         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1035         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1036         struct intel_panel *panel = &connector->panel;
1037         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1038         u32 ctl, ctl2;
1039
1040         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1041         if (ctl2 & BLM_PWM_ENABLE) {
1042                 DRM_DEBUG_KMS("backlight already enabled\n");
1043                 ctl2 &= ~BLM_PWM_ENABLE;
1044                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1045         }
1046
1047         ctl = panel->backlight.max << 16;
1048         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1049
1050         /* XXX: combine this into above write? */
1051         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1052
1053         ctl2 = 0;
1054         if (panel->backlight.active_low_pwm)
1055                 ctl2 |= BLM_POLARITY_I965;
1056         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1057         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1058         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1059 }
1060
1061 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1062                                  const struct drm_connector_state *conn_state)
1063 {
1064         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1065         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1066         struct intel_panel *panel = &connector->panel;
1067         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1068         u32 pwm_ctl, val;
1069
1070         /* Controller 1 uses the utility pin. */
1071         if (panel->backlight.controller == 1) {
1072                 val = I915_READ(UTIL_PIN_CTL);
1073                 if (val & UTIL_PIN_ENABLE) {
1074                         DRM_DEBUG_KMS("util pin already enabled\n");
1075                         val &= ~UTIL_PIN_ENABLE;
1076                         I915_WRITE(UTIL_PIN_CTL, val);
1077                 }
1078
1079                 val = 0;
1080                 if (panel->backlight.util_pin_active_low)
1081                         val |= UTIL_PIN_POLARITY;
1082                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1083                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1084         }
1085
1086         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1087         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1088                 DRM_DEBUG_KMS("backlight already enabled\n");
1089                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1090                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1091                                 pwm_ctl);
1092         }
1093
1094         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1095                         panel->backlight.max);
1096
1097         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1098
1099         pwm_ctl = 0;
1100         if (panel->backlight.active_low_pwm)
1101                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1102
1103         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1104         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1105         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1106                         pwm_ctl | BXT_BLC_PWM_ENABLE);
1107 }
1108
1109 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1110                                  const struct drm_connector_state *conn_state)
1111 {
1112         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1113         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1114         struct intel_panel *panel = &connector->panel;
1115         u32 pwm_ctl;
1116
1117         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1118         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1119                 DRM_DEBUG_KMS("backlight already enabled\n");
1120                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1121                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1122                            pwm_ctl);
1123         }
1124
1125         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1126                    panel->backlight.max);
1127
1128         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1129
1130         pwm_ctl = 0;
1131         if (panel->backlight.active_low_pwm)
1132                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1133
1134         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1135         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1136         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1137                    pwm_ctl | BXT_BLC_PWM_ENABLE);
1138 }
1139
1140 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1141                                  const struct drm_connector_state *conn_state)
1142 {
1143         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1144         struct intel_panel *panel = &connector->panel;
1145
1146         pwm_enable(panel->backlight.pwm);
1147         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1148 }
1149
1150 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1151                                   const struct drm_connector_state *conn_state)
1152 {
1153         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1154         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1155         struct intel_panel *panel = &connector->panel;
1156         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1157
1158         if (!panel->backlight.present)
1159                 return;
1160
1161         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1162
1163         mutex_lock(&dev_priv->backlight_lock);
1164
1165         WARN_ON(panel->backlight.max == 0);
1166
1167         if (panel->backlight.level <= panel->backlight.min) {
1168                 panel->backlight.level = panel->backlight.max;
1169                 if (panel->backlight.device)
1170                         panel->backlight.device->props.brightness =
1171                                 scale_hw_to_user(connector,
1172                                                  panel->backlight.level,
1173                                                  panel->backlight.device->props.max_brightness);
1174         }
1175
1176         panel->backlight.enable(crtc_state, conn_state);
1177         panel->backlight.enabled = true;
1178         if (panel->backlight.device)
1179                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1180
1181         mutex_unlock(&dev_priv->backlight_lock);
1182 }
1183
1184 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1185 static int intel_backlight_device_update_status(struct backlight_device *bd)
1186 {
1187         struct intel_connector *connector = bl_get_data(bd);
1188         struct intel_panel *panel = &connector->panel;
1189         struct drm_device *dev = connector->base.dev;
1190
1191         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1192         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1193                       bd->props.brightness, bd->props.max_brightness);
1194         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1195                                   bd->props.max_brightness);
1196
1197         /*
1198          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1199          * backlight class device does not make it easy to to differentiate
1200          * between callbacks for brightness and bl_power, so our backlight_power
1201          * callback needs to take this into account.
1202          */
1203         if (panel->backlight.enabled) {
1204                 if (panel->backlight.power) {
1205                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1206                                 bd->props.brightness != 0;
1207                         panel->backlight.power(connector, enable);
1208                 }
1209         } else {
1210                 bd->props.power = FB_BLANK_POWERDOWN;
1211         }
1212
1213         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1214         return 0;
1215 }
1216
1217 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1218 {
1219         struct intel_connector *connector = bl_get_data(bd);
1220         struct drm_device *dev = connector->base.dev;
1221         struct drm_i915_private *dev_priv = to_i915(dev);
1222         u32 hw_level;
1223         int ret;
1224
1225         intel_runtime_pm_get(dev_priv);
1226         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1227
1228         hw_level = intel_panel_get_backlight(connector);
1229         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1230
1231         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1232         intel_runtime_pm_put(dev_priv);
1233
1234         return ret;
1235 }
1236
1237 static const struct backlight_ops intel_backlight_device_ops = {
1238         .update_status = intel_backlight_device_update_status,
1239         .get_brightness = intel_backlight_device_get_brightness,
1240 };
1241
1242 int intel_backlight_device_register(struct intel_connector *connector)
1243 {
1244         struct intel_panel *panel = &connector->panel;
1245         struct backlight_properties props;
1246
1247         if (WARN_ON(panel->backlight.device))
1248                 return -ENODEV;
1249
1250         if (!panel->backlight.present)
1251                 return 0;
1252
1253         WARN_ON(panel->backlight.max == 0);
1254
1255         memset(&props, 0, sizeof(props));
1256         props.type = BACKLIGHT_RAW;
1257
1258         /*
1259          * Note: Everything should work even if the backlight device max
1260          * presented to the userspace is arbitrarily chosen.
1261          */
1262         props.max_brightness = panel->backlight.max;
1263         props.brightness = scale_hw_to_user(connector,
1264                                             panel->backlight.level,
1265                                             props.max_brightness);
1266
1267         if (panel->backlight.enabled)
1268                 props.power = FB_BLANK_UNBLANK;
1269         else
1270                 props.power = FB_BLANK_POWERDOWN;
1271
1272         /*
1273          * Note: using the same name independent of the connector prevents
1274          * registration of multiple backlight devices in the driver.
1275          */
1276         panel->backlight.device =
1277                 backlight_device_register("intel_backlight",
1278                                           connector->base.kdev,
1279                                           connector,
1280                                           &intel_backlight_device_ops, &props);
1281
1282         if (IS_ERR(panel->backlight.device)) {
1283                 DRM_ERROR("Failed to register backlight: %ld\n",
1284                           PTR_ERR(panel->backlight.device));
1285                 panel->backlight.device = NULL;
1286                 return -ENODEV;
1287         }
1288
1289         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1290                       connector->base.name);
1291
1292         return 0;
1293 }
1294
1295 void intel_backlight_device_unregister(struct intel_connector *connector)
1296 {
1297         struct intel_panel *panel = &connector->panel;
1298
1299         if (panel->backlight.device) {
1300                 backlight_device_unregister(panel->backlight.device);
1301                 panel->backlight.device = NULL;
1302         }
1303 }
1304 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1305
1306 /*
1307  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1308  *      PWM increment = 1
1309  */
1310 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1311 {
1312         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1313
1314         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1315 }
1316
1317 /*
1318  * BXT: PWM clock frequency = 19.2 MHz.
1319  */
1320 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1321 {
1322         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1323 }
1324
1325 /*
1326  * SPT: This value represents the period of the PWM stream in clock periods
1327  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1328  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1329  */
1330 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1331 {
1332         struct intel_panel *panel = &connector->panel;
1333         u32 mul;
1334
1335         if (panel->backlight.alternate_pwm_increment)
1336                 mul = 128;
1337         else
1338                 mul = 16;
1339
1340         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1341 }
1342
1343 /*
1344  * LPT: This value represents the period of the PWM stream in clock periods
1345  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1346  * LPT SOUTH_CHICKEN2 register bit 5).
1347  */
1348 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1349 {
1350         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1351         struct intel_panel *panel = &connector->panel;
1352         u32 mul, clock;
1353
1354         if (panel->backlight.alternate_pwm_increment)
1355                 mul = 16;
1356         else
1357                 mul = 128;
1358
1359         if (HAS_PCH_LPT_H(dev_priv))
1360                 clock = MHz(135); /* LPT:H */
1361         else
1362                 clock = MHz(24); /* LPT:LP */
1363
1364         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1365 }
1366
1367 /*
1368  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1369  * display raw clocks multiplied by 128.
1370  */
1371 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1372 {
1373         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1374
1375         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1376 }
1377
1378 /*
1379  * Gen2: This field determines the number of time base events (display core
1380  * clock frequency/32) in total for a complete cycle of modulated backlight
1381  * control.
1382  *
1383  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1384  * divided by 32.
1385  */
1386 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1387 {
1388         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1389         int clock;
1390
1391         if (IS_PINEVIEW(dev_priv))
1392                 clock = KHz(dev_priv->rawclk_freq);
1393         else
1394                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1395
1396         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1397 }
1398
1399 /*
1400  * Gen4: This value represents the period of the PWM stream in display core
1401  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1402  *
1403  */
1404 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1405 {
1406         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1407         int clock;
1408
1409         if (IS_G4X(dev_priv))
1410                 clock = KHz(dev_priv->rawclk_freq);
1411         else
1412                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1413
1414         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1415 }
1416
1417 /*
1418  * VLV: This value represents the period of the PWM stream in display core
1419  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1420  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1421  */
1422 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1423 {
1424         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1425         int mul, clock;
1426
1427         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1428                 if (IS_CHERRYVIEW(dev_priv))
1429                         clock = KHz(19200);
1430                 else
1431                         clock = MHz(25);
1432                 mul = 16;
1433         } else {
1434                 clock = KHz(dev_priv->rawclk_freq);
1435                 mul = 128;
1436         }
1437
1438         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1439 }
1440
1441 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1442 {
1443         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1444         struct intel_panel *panel = &connector->panel;
1445         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1446         u32 pwm;
1447
1448         if (!panel->backlight.hz_to_pwm) {
1449                 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1450                 return 0;
1451         }
1452
1453         if (pwm_freq_hz) {
1454                 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1455                               pwm_freq_hz);
1456         } else {
1457                 pwm_freq_hz = 200;
1458                 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1459                               pwm_freq_hz);
1460         }
1461
1462         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1463         if (!pwm) {
1464                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1465                 return 0;
1466         }
1467
1468         return pwm;
1469 }
1470
1471 /*
1472  * Note: The setup hooks can't assume pipe is set!
1473  */
1474 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1475 {
1476         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1477         struct intel_panel *panel = &connector->panel;
1478         int min;
1479
1480         WARN_ON(panel->backlight.max == 0);
1481
1482         /*
1483          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1484          * to problems. There are such machines out there. Either our
1485          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1486          * against this by letting the minimum be at most (arbitrarily chosen)
1487          * 25% of the max.
1488          */
1489         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1490         if (min != dev_priv->vbt.backlight.min_brightness) {
1491                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1492                               dev_priv->vbt.backlight.min_brightness, min);
1493         }
1494
1495         /* vbt value is a coefficient in range [0..255] */
1496         return scale(min, 0, 255, 0, panel->backlight.max);
1497 }
1498
1499 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1500 {
1501         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1502         struct intel_panel *panel = &connector->panel;
1503         u32 pch_ctl1, pch_ctl2, val;
1504         bool alt;
1505
1506         if (HAS_PCH_LPT(dev_priv))
1507                 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1508         else
1509                 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1510         panel->backlight.alternate_pwm_increment = alt;
1511
1512         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1513         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1514
1515         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1516         panel->backlight.max = pch_ctl2 >> 16;
1517
1518         if (!panel->backlight.max)
1519                 panel->backlight.max = get_backlight_max_vbt(connector);
1520
1521         if (!panel->backlight.max)
1522                 return -ENODEV;
1523
1524         panel->backlight.min = get_backlight_min_vbt(connector);
1525
1526         val = lpt_get_backlight(connector);
1527         val = intel_panel_compute_brightness(connector, val);
1528         panel->backlight.level = clamp(val, panel->backlight.min,
1529                                        panel->backlight.max);
1530
1531         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1532
1533         return 0;
1534 }
1535
1536 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1537 {
1538         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1539         struct intel_panel *panel = &connector->panel;
1540         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1541
1542         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1543         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1544
1545         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1546         panel->backlight.max = pch_ctl2 >> 16;
1547
1548         if (!panel->backlight.max)
1549                 panel->backlight.max = get_backlight_max_vbt(connector);
1550
1551         if (!panel->backlight.max)
1552                 return -ENODEV;
1553
1554         panel->backlight.min = get_backlight_min_vbt(connector);
1555
1556         val = pch_get_backlight(connector);
1557         val = intel_panel_compute_brightness(connector, val);
1558         panel->backlight.level = clamp(val, panel->backlight.min,
1559                                        panel->backlight.max);
1560
1561         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1562         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1563                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1564
1565         return 0;
1566 }
1567
1568 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1569 {
1570         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1571         struct intel_panel *panel = &connector->panel;
1572         u32 ctl, val;
1573
1574         ctl = I915_READ(BLC_PWM_CTL);
1575
1576         if (IS_GEN2(dev_priv) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1577                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1578
1579         if (IS_PINEVIEW(dev_priv))
1580                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1581
1582         panel->backlight.max = ctl >> 17;
1583
1584         if (!panel->backlight.max) {
1585                 panel->backlight.max = get_backlight_max_vbt(connector);
1586                 panel->backlight.max >>= 1;
1587         }
1588
1589         if (!panel->backlight.max)
1590                 return -ENODEV;
1591
1592         if (panel->backlight.combination_mode)
1593                 panel->backlight.max *= 0xff;
1594
1595         panel->backlight.min = get_backlight_min_vbt(connector);
1596
1597         val = i9xx_get_backlight(connector);
1598         val = intel_panel_compute_brightness(connector, val);
1599         panel->backlight.level = clamp(val, panel->backlight.min,
1600                                        panel->backlight.max);
1601
1602         panel->backlight.enabled = val != 0;
1603
1604         return 0;
1605 }
1606
1607 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1608 {
1609         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1610         struct intel_panel *panel = &connector->panel;
1611         u32 ctl, ctl2, val;
1612
1613         ctl2 = I915_READ(BLC_PWM_CTL2);
1614         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1615         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1616
1617         ctl = I915_READ(BLC_PWM_CTL);
1618         panel->backlight.max = ctl >> 16;
1619
1620         if (!panel->backlight.max)
1621                 panel->backlight.max = get_backlight_max_vbt(connector);
1622
1623         if (!panel->backlight.max)
1624                 return -ENODEV;
1625
1626         if (panel->backlight.combination_mode)
1627                 panel->backlight.max *= 0xff;
1628
1629         panel->backlight.min = get_backlight_min_vbt(connector);
1630
1631         val = i9xx_get_backlight(connector);
1632         val = intel_panel_compute_brightness(connector, val);
1633         panel->backlight.level = clamp(val, panel->backlight.min,
1634                                        panel->backlight.max);
1635
1636         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1637
1638         return 0;
1639 }
1640
1641 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1642 {
1643         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1644         struct intel_panel *panel = &connector->panel;
1645         u32 ctl, ctl2, val;
1646
1647         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1648                 return -ENODEV;
1649
1650         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1651         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1652
1653         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1654         panel->backlight.max = ctl >> 16;
1655
1656         if (!panel->backlight.max)
1657                 panel->backlight.max = get_backlight_max_vbt(connector);
1658
1659         if (!panel->backlight.max)
1660                 return -ENODEV;
1661
1662         panel->backlight.min = get_backlight_min_vbt(connector);
1663
1664         val = _vlv_get_backlight(dev_priv, pipe);
1665         val = intel_panel_compute_brightness(connector, val);
1666         panel->backlight.level = clamp(val, panel->backlight.min,
1667                                        panel->backlight.max);
1668
1669         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1670
1671         return 0;
1672 }
1673
1674 static int
1675 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1676 {
1677         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1678         struct intel_panel *panel = &connector->panel;
1679         u32 pwm_ctl, val;
1680
1681         panel->backlight.controller = dev_priv->vbt.backlight.controller;
1682
1683         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1684
1685         /* Controller 1 uses the utility pin. */
1686         if (panel->backlight.controller == 1) {
1687                 val = I915_READ(UTIL_PIN_CTL);
1688                 panel->backlight.util_pin_active_low =
1689                                         val & UTIL_PIN_POLARITY;
1690         }
1691
1692         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1693         panel->backlight.max =
1694                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1695
1696         if (!panel->backlight.max)
1697                 panel->backlight.max = get_backlight_max_vbt(connector);
1698
1699         if (!panel->backlight.max)
1700                 return -ENODEV;
1701
1702         panel->backlight.min = get_backlight_min_vbt(connector);
1703
1704         val = bxt_get_backlight(connector);
1705         val = intel_panel_compute_brightness(connector, val);
1706         panel->backlight.level = clamp(val, panel->backlight.min,
1707                                        panel->backlight.max);
1708
1709         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1710
1711         return 0;
1712 }
1713
1714 static int
1715 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1716 {
1717         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1718         struct intel_panel *panel = &connector->panel;
1719         u32 pwm_ctl, val;
1720
1721         /*
1722          * CNP has the BXT implementation of backlight, but with only
1723          * one controller. Future platforms could have multiple controllers
1724          * so let's make this extensible and prepared for the future.
1725          */
1726         panel->backlight.controller = 0;
1727
1728         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1729
1730         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1731         panel->backlight.max =
1732                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1733
1734         if (!panel->backlight.max)
1735                 panel->backlight.max = get_backlight_max_vbt(connector);
1736
1737         if (!panel->backlight.max)
1738                 return -ENODEV;
1739
1740         panel->backlight.min = get_backlight_min_vbt(connector);
1741
1742         val = bxt_get_backlight(connector);
1743         val = intel_panel_compute_brightness(connector, val);
1744         panel->backlight.level = clamp(val, panel->backlight.min,
1745                                        panel->backlight.max);
1746
1747         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1748
1749         return 0;
1750 }
1751
1752 static int pwm_setup_backlight(struct intel_connector *connector,
1753                                enum pipe pipe)
1754 {
1755         struct drm_device *dev = connector->base.dev;
1756         struct intel_panel *panel = &connector->panel;
1757         int retval;
1758
1759         /* Get the PWM chip for backlight control */
1760         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1761         if (IS_ERR(panel->backlight.pwm)) {
1762                 DRM_ERROR("Failed to own the pwm chip\n");
1763                 panel->backlight.pwm = NULL;
1764                 return -ENODEV;
1765         }
1766
1767         /*
1768          * FIXME: pwm_apply_args() should be removed when switching to
1769          * the atomic PWM API.
1770          */
1771         pwm_apply_args(panel->backlight.pwm);
1772
1773         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1774                             CRC_PMIC_PWM_PERIOD_NS);
1775         if (retval < 0) {
1776                 DRM_ERROR("Failed to configure the pwm chip\n");
1777                 pwm_put(panel->backlight.pwm);
1778                 panel->backlight.pwm = NULL;
1779                 return retval;
1780         }
1781
1782         panel->backlight.min = 0; /* 0% */
1783         panel->backlight.max = 100; /* 100% */
1784         panel->backlight.level = DIV_ROUND_UP(
1785                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1786                                  CRC_PMIC_PWM_PERIOD_NS);
1787         panel->backlight.enabled = panel->backlight.level != 0;
1788
1789         return 0;
1790 }
1791
1792 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1793 {
1794         struct drm_i915_private *dev_priv = to_i915(connector->dev);
1795         struct intel_connector *intel_connector = to_intel_connector(connector);
1796         struct intel_panel *panel = &intel_connector->panel;
1797         int ret;
1798
1799         if (!dev_priv->vbt.backlight.present) {
1800                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1801                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1802                 } else {
1803                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1804                         return 0;
1805                 }
1806         }
1807
1808         /* ensure intel_panel has been initialized first */
1809         if (WARN_ON(!panel->backlight.setup))
1810                 return -ENODEV;
1811
1812         /* set level and max in panel struct */
1813         mutex_lock(&dev_priv->backlight_lock);
1814         ret = panel->backlight.setup(intel_connector, pipe);
1815         mutex_unlock(&dev_priv->backlight_lock);
1816
1817         if (ret) {
1818                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1819                               connector->name);
1820                 return ret;
1821         }
1822
1823         panel->backlight.present = true;
1824
1825         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1826                       connector->name,
1827                       enableddisabled(panel->backlight.enabled),
1828                       panel->backlight.level, panel->backlight.max);
1829
1830         return 0;
1831 }
1832
1833 void intel_panel_destroy_backlight(struct drm_connector *connector)
1834 {
1835         struct intel_connector *intel_connector = to_intel_connector(connector);
1836         struct intel_panel *panel = &intel_connector->panel;
1837
1838         /* dispose of the pwm */
1839         if (panel->backlight.pwm)
1840                 pwm_put(panel->backlight.pwm);
1841
1842         panel->backlight.present = false;
1843 }
1844
1845 /* Set up chip specific backlight functions */
1846 static void
1847 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1848 {
1849         struct intel_connector *connector =
1850                 container_of(panel, struct intel_connector, panel);
1851         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1852
1853         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1854             intel_dp_aux_init_backlight_funcs(connector) == 0)
1855                 return;
1856
1857         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1858             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1859                 return;
1860
1861         if (IS_GEN9_LP(dev_priv)) {
1862                 panel->backlight.setup = bxt_setup_backlight;
1863                 panel->backlight.enable = bxt_enable_backlight;
1864                 panel->backlight.disable = bxt_disable_backlight;
1865                 panel->backlight.set = bxt_set_backlight;
1866                 panel->backlight.get = bxt_get_backlight;
1867                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1868         } else if (HAS_PCH_CNP(dev_priv)) {
1869                 panel->backlight.setup = cnp_setup_backlight;
1870                 panel->backlight.enable = cnp_enable_backlight;
1871                 panel->backlight.disable = cnp_disable_backlight;
1872                 panel->backlight.set = bxt_set_backlight;
1873                 panel->backlight.get = bxt_get_backlight;
1874                 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1875         } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
1876                    HAS_PCH_KBP(dev_priv)) {
1877                 panel->backlight.setup = lpt_setup_backlight;
1878                 panel->backlight.enable = lpt_enable_backlight;
1879                 panel->backlight.disable = lpt_disable_backlight;
1880                 panel->backlight.set = lpt_set_backlight;
1881                 panel->backlight.get = lpt_get_backlight;
1882                 if (HAS_PCH_LPT(dev_priv))
1883                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1884                 else
1885                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1886         } else if (HAS_PCH_SPLIT(dev_priv)) {
1887                 panel->backlight.setup = pch_setup_backlight;
1888                 panel->backlight.enable = pch_enable_backlight;
1889                 panel->backlight.disable = pch_disable_backlight;
1890                 panel->backlight.set = pch_set_backlight;
1891                 panel->backlight.get = pch_get_backlight;
1892                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1893         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1894                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1895                         panel->backlight.setup = pwm_setup_backlight;
1896                         panel->backlight.enable = pwm_enable_backlight;
1897                         panel->backlight.disable = pwm_disable_backlight;
1898                         panel->backlight.set = pwm_set_backlight;
1899                         panel->backlight.get = pwm_get_backlight;
1900                 } else {
1901                         panel->backlight.setup = vlv_setup_backlight;
1902                         panel->backlight.enable = vlv_enable_backlight;
1903                         panel->backlight.disable = vlv_disable_backlight;
1904                         panel->backlight.set = vlv_set_backlight;
1905                         panel->backlight.get = vlv_get_backlight;
1906                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1907                 }
1908         } else if (IS_GEN4(dev_priv)) {
1909                 panel->backlight.setup = i965_setup_backlight;
1910                 panel->backlight.enable = i965_enable_backlight;
1911                 panel->backlight.disable = i965_disable_backlight;
1912                 panel->backlight.set = i9xx_set_backlight;
1913                 panel->backlight.get = i9xx_get_backlight;
1914                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1915         } else {
1916                 panel->backlight.setup = i9xx_setup_backlight;
1917                 panel->backlight.enable = i9xx_enable_backlight;
1918                 panel->backlight.disable = i9xx_disable_backlight;
1919                 panel->backlight.set = i9xx_set_backlight;
1920                 panel->backlight.get = i9xx_get_backlight;
1921                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1922         }
1923 }
1924
1925 int intel_panel_init(struct intel_panel *panel,
1926                      struct drm_display_mode *fixed_mode,
1927                      struct drm_display_mode *alt_fixed_mode,
1928                      struct drm_display_mode *downclock_mode)
1929 {
1930         intel_panel_init_backlight_funcs(panel);
1931
1932         panel->fixed_mode = fixed_mode;
1933         panel->alt_fixed_mode = alt_fixed_mode;
1934         panel->downclock_mode = downclock_mode;
1935
1936         return 0;
1937 }
1938
1939 void intel_panel_fini(struct intel_panel *panel)
1940 {
1941         struct intel_connector *intel_connector =
1942                 container_of(panel, struct intel_connector, panel);
1943
1944         if (panel->fixed_mode)
1945                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1946
1947         if (panel->alt_fixed_mode)
1948                 drm_mode_destroy(intel_connector->base.dev,
1949                                 panel->alt_fixed_mode);
1950
1951         if (panel->downclock_mode)
1952                 drm_mode_destroy(intel_connector->base.dev,
1953                                 panel->downclock_mode);
1954 }