drivers/gpu/drm/i915/display/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
  37 #include "intel_connector.h"
  38 #include "intel_display_types.h"
  39 #include "intel_dp_aux_backlight.h"
  40 #include "intel_dsi_dcs_backlight.h"
  41 #include "intel_panel.h"
  42
  43 void
  44 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  45                        struct drm_display_mode *adjusted_mode)
  46 {
  47         drm_mode_copy(adjusted_mode, fixed_mode);
  48
  49         drm_mode_set_crtcinfo(adjusted_mode, 0);
  50 }
  51
  52 static bool is_downclock_mode(const struct drm_display_mode *downclock_mode,
  53                               const struct drm_display_mode *fixed_mode)
  54 {
  55         return drm_mode_match(downclock_mode, fixed_mode,
  56                               DRM_MODE_MATCH_TIMINGS |
  57                               DRM_MODE_MATCH_FLAGS |
  58                               DRM_MODE_MATCH_3D_FLAGS) &&
  59                 downclock_mode->clock < fixed_mode->clock;
  60 }
  61
  62 struct drm_display_mode *
  63 intel_panel_edid_downclock_mode(struct intel_connector *connector,
  64                                 const struct drm_display_mode *fixed_mode)
  65 {
  66         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
  67         const struct drm_display_mode *scan, *best_mode = NULL;
  68         struct drm_display_mode *downclock_mode;
  69         int best_clock = fixed_mode->clock;
  70
  71         list_for_each_entry(scan, &connector->base.probed_modes, head) {
  72                 /*
  73                  * If one mode has the same resolution with the fixed_panel
  74                  * mode while they have the different refresh rate, it means
  75                  * that the reduced downclock is found. In such
  76                  * case we can set the different FPx0/1 to dynamically select
  77                  * between low and high frequency.
  78                  */
  79                 if (is_downclock_mode(scan, fixed_mode) &&
  80                     scan->clock < best_clock) {
  81                         /*
  82                          * The downclock is already found. But we
  83                          * expect to find the lower downclock.
  84                          */
  85                         best_clock = scan->clock;
  86                         best_mode = scan;
  87                 }
  88         }
  89
  90         if (!best_mode)
  91                 return NULL;
  92
  93         downclock_mode = drm_mode_duplicate(&dev_priv->drm, best_mode);
  94         if (!downclock_mode)
  95                 return NULL;
  96
  97         drm_dbg_kms(&dev_priv->drm,
  98                     "[CONNECTOR:%d:%s] using downclock mode from EDID: ",
  99                     connector->base.base.id, connector->base.name);
 100         drm_mode_debug_printmodeline(downclock_mode);
 101
 102         return downclock_mode;
 103 }
 104
 105 struct drm_display_mode *
 106 intel_panel_edid_fixed_mode(struct intel_connector *connector)
 107 {
 108         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 109         const struct drm_display_mode *scan;
 110         struct drm_display_mode *fixed_mode;
 111
 112         if (list_empty(&connector->base.probed_modes))
 113                 return NULL;
 114
 115         /* prefer fixed mode from EDID if available */
 116         list_for_each_entry(scan, &connector->base.probed_modes, head) {
 117                 if ((scan->type & DRM_MODE_TYPE_PREFERRED) == 0)
 118                         continue;
 119
 120                 fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
 121                 if (!fixed_mode)
 122                         return NULL;
 123
 124                 drm_dbg_kms(&dev_priv->drm,
 125                             "[CONNECTOR:%d:%s] using preferred mode from EDID: ",
 126                             connector->base.base.id, connector->base.name);
 127                 drm_mode_debug_printmodeline(fixed_mode);
 128
 129                 return fixed_mode;
 130         }
 131
 132         scan = list_first_entry(&connector->base.probed_modes,
 133                                 typeof(*scan), head);
 134
 135         fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
 136         if (!fixed_mode)
 137                 return NULL;
 138
 139         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 140
 141         drm_dbg_kms(&dev_priv->drm,
 142                     "[CONNECTOR:%d:%s] using first mode from EDID: ",
 143                     connector->base.base.id, connector->base.name);
 144         drm_mode_debug_printmodeline(fixed_mode);
 145
 146         return fixed_mode;
 147 }
 148
 149 struct drm_display_mode *
 150 intel_panel_vbt_fixed_mode(struct intel_connector *connector)
 151 {
 152         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 153         struct drm_display_info *info = &connector->base.display_info;
 154         struct drm_display_mode *fixed_mode;
 155
 156         if (!dev_priv->vbt.lfp_lvds_vbt_mode)
 157                 return NULL;
 158
 159         fixed_mode = drm_mode_duplicate(&dev_priv->drm,
 160                                         dev_priv->vbt.lfp_lvds_vbt_mode);
 161         if (!fixed_mode)
 162                 return NULL;
 163
 164         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 165
 166         drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] using mode from VBT: ",
 167                     connector->base.base.id, connector->base.name);
 168         drm_mode_debug_printmodeline(fixed_mode);
 169
 170         info->width_mm = fixed_mode->width_mm;
 171         info->height_mm = fixed_mode->height_mm;
 172
 173         return fixed_mode;
 174 }
 175
 176 /* adjusted_mode has been preset to be the panel's fixed mode */
 177 int intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
 178                             const struct drm_connector_state *conn_state)
 179 {
 180         const struct drm_display_mode *adjusted_mode =
 181                 &crtc_state->hw.adjusted_mode;
 182         int x, y, width, height;
 183
 184         /* Native modes don't need fitting */
 185         if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
 186             adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h &&
 187             crtc_state->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
 188                 return 0;
 189
 190         switch (conn_state->scaling_mode) {
 191         case DRM_MODE_SCALE_CENTER:
 192                 width = crtc_state->pipe_src_w;
 193                 height = crtc_state->pipe_src_h;
 194                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 195                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 196                 break;
 197
 198         case DRM_MODE_SCALE_ASPECT:
 199                 /* Scale but preserve the aspect ratio */
 200                 {
 201                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 202                                 * crtc_state->pipe_src_h;
 203                         u32 scaled_height = crtc_state->pipe_src_w
 204                                 * adjusted_mode->crtc_vdisplay;
 205                         if (scaled_width > scaled_height) { /* pillar */
 206                                 width = scaled_height / crtc_state->pipe_src_h;
 207                                 if (width & 1)
 208                                         width++;
 209                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 210                                 y = 0;
 211                                 height = adjusted_mode->crtc_vdisplay;
 212                         } else if (scaled_width < scaled_height) { /* letter */
 213                                 height = scaled_width / crtc_state->pipe_src_w;
 214                                 if (height & 1)
 215                                     height++;
 216                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 217                                 x = 0;
 218                                 width = adjusted_mode->crtc_hdisplay;
 219                         } else {
 220                                 x = y = 0;
 221                                 width = adjusted_mode->crtc_hdisplay;
 222                                 height = adjusted_mode->crtc_vdisplay;
 223                         }
 224                 }
 225                 break;
 226
 227         case DRM_MODE_SCALE_NONE:
 228                 WARN_ON(adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w);
 229                 WARN_ON(adjusted_mode->crtc_vdisplay != crtc_state->pipe_src_h);
 230                 fallthrough;
 231         case DRM_MODE_SCALE_FULLSCREEN:
 232                 x = y = 0;
 233                 width = adjusted_mode->crtc_hdisplay;
 234                 height = adjusted_mode->crtc_vdisplay;
 235                 break;
 236
 237         default:
 238                 MISSING_CASE(conn_state->scaling_mode);
 239                 return -EINVAL;
 240         }
 241
 242         drm_rect_init(&crtc_state->pch_pfit.dst,
 243                       x, y, width, height);
 244         crtc_state->pch_pfit.enabled = true;
 245
 246         return 0;
 247 }
 248
 249 static void
 250 centre_horizontally(struct drm_display_mode *adjusted_mode,
 251                     int width)
 252 {
 253         u32 border, sync_pos, blank_width, sync_width;
 254
 255         /* keep the hsync and hblank widths constant */
 256         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 257         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 258         sync_pos = (blank_width - sync_width + 1) / 2;
 259
 260         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 261         border += border & 1; /* make the border even */
 262
 263         adjusted_mode->crtc_hdisplay = width;
 264         adjusted_mode->crtc_hblank_start = width + border;
 265         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 266
 267         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 268         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 269 }
 270
 271 static void
 272 centre_vertically(struct drm_display_mode *adjusted_mode,
 273                   int height)
 274 {
 275         u32 border, sync_pos, blank_width, sync_width;
 276
 277         /* keep the vsync and vblank widths constant */
 278         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 279         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 280         sync_pos = (blank_width - sync_width + 1) / 2;
 281
 282         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 283
 284         adjusted_mode->crtc_vdisplay = height;
 285         adjusted_mode->crtc_vblank_start = height + border;
 286         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 287
 288         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 289         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 290 }
 291
 292 static u32 panel_fitter_scaling(u32 source, u32 target)
 293 {
 294         /*
 295          * Floating point operation is not supported. So the FACTOR
 296          * is defined, which can avoid the floating point computation
 297          * when calculating the panel ratio.
 298          */
 299 #define ACCURACY 12
 300 #define FACTOR (1 << ACCURACY)
 301         u32 ratio = source * FACTOR / target;
 302         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 303 }
 304
 305 static void i965_scale_aspect(struct intel_crtc_state *crtc_state,
 306                               u32 *pfit_control)
 307 {
 308         const struct drm_display_mode *adjusted_mode =
 309                 &crtc_state->hw.adjusted_mode;
 310         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 311                 crtc_state->pipe_src_h;
 312         u32 scaled_height = crtc_state->pipe_src_w *
 313                 adjusted_mode->crtc_vdisplay;
 314
 315         /* 965+ is easy, it does everything in hw */
 316         if (scaled_width > scaled_height)
 317                 *pfit_control |= PFIT_ENABLE |
 318                         PFIT_SCALING_PILLAR;
 319         else if (scaled_width < scaled_height)
 320                 *pfit_control |= PFIT_ENABLE |
 321                         PFIT_SCALING_LETTER;
 322         else if (adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w)
 323                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 324 }
 325
 326 static void i9xx_scale_aspect(struct intel_crtc_state *crtc_state,
 327                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 328                               u32 *border)
 329 {
 330         struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
 331         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 332                 crtc_state->pipe_src_h;
 333         u32 scaled_height = crtc_state->pipe_src_w *
 334                 adjusted_mode->crtc_vdisplay;
 335         u32 bits;
 336
 337         /*
 338          * For earlier chips we have to calculate the scaling
 339          * ratio by hand and program it into the
 340          * PFIT_PGM_RATIO register
 341          */
 342         if (scaled_width > scaled_height) { /* pillar */
 343                 centre_horizontally(adjusted_mode,
 344                                     scaled_height /
 345                                     crtc_state->pipe_src_h);
 346
 347                 *border = LVDS_BORDER_ENABLE;
 348                 if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 349                         bits = panel_fitter_scaling(crtc_state->pipe_src_h,
 350                                                     adjusted_mode->crtc_vdisplay);
 351
 352                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 353                                              bits << PFIT_VERT_SCALE_SHIFT);
 354                         *pfit_control |= (PFIT_ENABLE |
 355                                           VERT_INTERP_BILINEAR |
 356                                           HORIZ_INTERP_BILINEAR);
 357                 }
 358         } else if (scaled_width < scaled_height) { /* letter */
 359                 centre_vertically(adjusted_mode,
 360                                   scaled_width /
 361                                   crtc_state->pipe_src_w);
 362
 363                 *border = LVDS_BORDER_ENABLE;
 364                 if (crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 365                         bits = panel_fitter_scaling(crtc_state->pipe_src_w,
 366                                                     adjusted_mode->crtc_hdisplay);
 367
 368                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 369                                              bits << PFIT_VERT_SCALE_SHIFT);
 370                         *pfit_control |= (PFIT_ENABLE |
 371                                           VERT_INTERP_BILINEAR |
 372                                           HORIZ_INTERP_BILINEAR);
 373                 }
 374         } else {
 375                 /* Aspects match, Let hw scale both directions */
 376                 *pfit_control |= (PFIT_ENABLE |
 377                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 378                                   VERT_INTERP_BILINEAR |
 379                                   HORIZ_INTERP_BILINEAR);
 380         }
 381 }
 382
 383 int intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
 384                              const struct drm_connector_state *conn_state)
 385 {
 386         struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 387         struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 388         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 389         struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
 390
 391         /* Native modes don't need fitting */
 392         if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
 393             adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h)
 394                 goto out;
 395
 396         switch (conn_state->scaling_mode) {
 397         case DRM_MODE_SCALE_CENTER:
 398                 /*
 399                  * For centered modes, we have to calculate border widths &
 400                  * heights and modify the values programmed into the CRTC.
 401                  */
 402                 centre_horizontally(adjusted_mode, crtc_state->pipe_src_w);
 403                 centre_vertically(adjusted_mode, crtc_state->pipe_src_h);
 404                 border = LVDS_BORDER_ENABLE;
 405                 break;
 406         case DRM_MODE_SCALE_ASPECT:
 407                 /* Scale but preserve the aspect ratio */
 408                 if (INTEL_GEN(dev_priv) >= 4)
 409                         i965_scale_aspect(crtc_state, &pfit_control);
 410                 else
 411                         i9xx_scale_aspect(crtc_state, &pfit_control,
 412                                           &pfit_pgm_ratios, &border);
 413                 break;
 414         case DRM_MODE_SCALE_FULLSCREEN:
 415                 /*
 416                  * Full scaling, even if it changes the aspect ratio.
 417                  * Fortunately this is all done for us in hw.
 418                  */
 419                 if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 420                     crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 421                         pfit_control |= PFIT_ENABLE;
 422                         if (INTEL_GEN(dev_priv) >= 4)
 423                                 pfit_control |= PFIT_SCALING_AUTO;
 424                         else
 425                                 pfit_control |= (VERT_AUTO_SCALE |
 426                                                  VERT_INTERP_BILINEAR |
 427                                                  HORIZ_AUTO_SCALE |
 428                                                  HORIZ_INTERP_BILINEAR);
 429                 }
 430                 break;
 431         default:
 432                 MISSING_CASE(conn_state->scaling_mode);
 433                 return -EINVAL;
 434         }
 435
 436         /* 965+ wants fuzzy fitting */
 437         /* FIXME: handle multiple panels by failing gracefully */
 438         if (INTEL_GEN(dev_priv) >= 4)
 439                 pfit_control |= PFIT_PIPE(crtc->pipe) | PFIT_FILTER_FUZZY;
 440
 441 out:
 442         if ((pfit_control & PFIT_ENABLE) == 0) {
 443                 pfit_control = 0;
 444                 pfit_pgm_ratios = 0;
 445         }
 446
 447         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 448         if (INTEL_GEN(dev_priv) < 4 && crtc_state->pipe_bpp == 18)
 449                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 450
 451         crtc_state->gmch_pfit.control = pfit_control;
 452         crtc_state->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 453         crtc_state->gmch_pfit.lvds_border_bits = border;
 454
 455         return 0;
 456 }
 457
 458 /**
 459  * scale - scale values from one range to another
 460  * @source_val: value in range [@source_min..@source_max]
 461  * @source_min: minimum legal value for @source_val
 462  * @source_max: maximum legal value for @source_val
 463  * @target_min: corresponding target value for @source_min
 464  * @target_max: corresponding target value for @source_max
 465  *
 466  * Return @source_val in range [@source_min..@source_max] scaled to range
 467  * [@target_min..@target_max].
 468  */
 469 static u32 scale(u32 source_val,
 470                  u32 source_min, u32 source_max,
 471                  u32 target_min, u32 target_max)
 472 {
 473         u64 target_val;
 474
 475         WARN_ON(source_min > source_max);
 476         WARN_ON(target_min > target_max);
 477
 478         /* defensive */
 479         source_val = clamp(source_val, source_min, source_max);
 480
 481         /* avoid overflows */
 482         target_val = mul_u32_u32(source_val - source_min,
 483                                  target_max - target_min);
 484         target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
 485         target_val += target_min;
 486
 487         return target_val;
 488 }
 489
 490 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 491  * to [hw_min..hw_max]. */
 492 static u32 clamp_user_to_hw(struct intel_connector *connector,
 493                             u32 user_level, u32 user_max)
 494 {
 495         struct intel_panel *panel = &connector->panel;
 496         u32 hw_level;
 497
 498         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 499         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 500
 501         return hw_level;
 502 }
 503
 504 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 505 static u32 scale_hw_to_user(struct intel_connector *connector,
 506                             u32 hw_level, u32 user_max)
 507 {
 508         struct intel_panel *panel = &connector->panel;
 509
 510         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 511                      0, user_max);
 512 }
 513
 514 u32 intel_panel_invert_pwm_level(struct intel_connector *connector, u32 val)
 515 {
 516         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 517         struct intel_panel *panel = &connector->panel;
 518
 519         drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
 520
 521         if (dev_priv->params.invert_brightness < 0)
 522                 return val;
 523
 524         if (dev_priv->params.invert_brightness > 0 ||
 525             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 526                 return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
 527         }
 528
 529         return val;
 530 }
 531
 532 void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
 533 {
 534         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 535         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 536         struct intel_panel *panel = &connector->panel;
 537
 538         drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val);
 539         panel->backlight.pwm_funcs->set(conn_state, val);
 540 }
 541
 542 u32 intel_panel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
 543 {
 544         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 545         struct intel_panel *panel = &connector->panel;
 546
 547         drm_WARN_ON_ONCE(&dev_priv->drm,
 548                          panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
 549
 550         val = scale(val, panel->backlight.min, panel->backlight.max,
 551                     panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
 552
 553         return intel_panel_invert_pwm_level(connector, val);
 554 }
 555
 556 u32 intel_panel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
 557 {
 558         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 559         struct intel_panel *panel = &connector->panel;
 560
 561         drm_WARN_ON_ONCE(&dev_priv->drm,
 562                          panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
 563
 564         if (dev_priv->params.invert_brightness > 0 ||
 565             (dev_priv->params.invert_brightness == 0 && dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS))
 566                 val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
 567
 568         return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
 569                      panel->backlight.min, panel->backlight.max);
 570 }
 571
 572 static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
 573 {
 574         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 575
 576         return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 577 }
 578
 579 static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
 580 {
 581         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 582
 583         return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 584 }
 585
 586 static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
 587 {
 588         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 589         struct intel_panel *panel = &connector->panel;
 590         u32 val;
 591
 592         val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 593         if (INTEL_GEN(dev_priv) < 4)
 594                 val >>= 1;
 595
 596         if (panel->backlight.combination_mode) {
 597                 u8 lbpc;
 598
 599                 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
 600                 val *= lbpc;
 601         }
 602
 603         return val;
 604 }
 605
 606 static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
 607 {
 608         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 609
 610         if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
 611                 return 0;
 612
 613         return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 614 }
 615
 616 static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
 617 {
 618         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 619         struct intel_panel *panel = &connector->panel;
 620
 621         return intel_de_read(dev_priv,
 622                              BXT_BLC_PWM_DUTY(panel->backlight.controller));
 623 }
 624
 625 static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
 626 {
 627         struct intel_panel *panel = &connector->panel;
 628         struct pwm_state state;
 629
 630         pwm_get_state(panel->backlight.pwm, &state);
 631         return pwm_get_relative_duty_cycle(&state, 100);
 632 }
 633
 634 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 635 {
 636         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 637         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 638
 639         u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 640         intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
 641 }
 642
 643 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 644 {
 645         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 646         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 647         u32 tmp;
 648
 649         tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 650         intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
 651 }
 652
 653 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 654 {
 655         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 656         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 657         struct intel_panel *panel = &connector->panel;
 658         u32 tmp, mask;
 659
 660         drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
 661
 662         if (panel->backlight.combination_mode) {
 663                 u8 lbpc;
 664
 665                 lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
 666                 level /= lbpc;
 667                 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
 668         }
 669
 670         if (IS_GEN(dev_priv, 4)) {
 671                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 672         } else {
 673                 level <<= 1;
 674                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 675         }
 676
 677         tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
 678         intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
 679 }
 680
 681 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 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         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 686         u32 tmp;
 687
 688         tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 689         intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
 690 }
 691
 692 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 693 {
 694         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 695         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 696         struct intel_panel *panel = &connector->panel;
 697
 698         intel_de_write(dev_priv,
 699                        BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 700 }
 701
 702 static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 703 {
 704         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 705
 706         pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
 707         pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
 708 }
 709
 710 static void
 711 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 712 {
 713         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 714         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 715         struct intel_panel *panel = &connector->panel;
 716
 717         drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level);
 718
 719         panel->backlight.funcs->set(conn_state, level);
 720 }
 721
 722 /* set backlight brightness to level in range [0..max], assuming hw min is
 723  * respected.
 724  */
 725 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 726                                     u32 user_level, u32 user_max)
 727 {
 728         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 729         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 730         struct intel_panel *panel = &connector->panel;
 731         u32 hw_level;
 732
 733         /*
 734          * Lack of crtc may occur during driver init because
 735          * connection_mutex isn't held across the entire backlight
 736          * setup + modeset readout, and the BIOS can issue the
 737          * requests at any time.
 738          */
 739         if (!panel->backlight.present || !conn_state->crtc)
 740                 return;
 741
 742         mutex_lock(&dev_priv->backlight_lock);
 743
 744         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
 745
 746         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 747         panel->backlight.level = hw_level;
 748
 749         if (panel->backlight.device)
 750                 panel->backlight.device->props.brightness =
 751                         scale_hw_to_user(connector,
 752                                          panel->backlight.level,
 753                                          panel->backlight.device->props.max_brightness);
 754
 755         if (panel->backlight.enabled)
 756                 intel_panel_actually_set_backlight(conn_state, hw_level);
 757
 758         mutex_unlock(&dev_priv->backlight_lock);
 759 }
 760
 761 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
 762 {
 763         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 764         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 765         u32 tmp;
 766
 767         intel_panel_set_pwm_level(old_conn_state, level);
 768
 769         /*
 770          * Although we don't support or enable CPU PWM with LPT/SPT based
 771          * systems, it may have been enabled prior to loading the
 772          * driver. Disable to avoid warnings on LCPLL disable.
 773          *
 774          * This needs rework if we need to add support for CPU PWM on PCH split
 775          * platforms.
 776          */
 777         tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
 778         if (tmp & BLM_PWM_ENABLE) {
 779                 drm_dbg_kms(&dev_priv->drm,
 780                             "cpu backlight was enabled, disabling\n");
 781                 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
 782                                tmp & ~BLM_PWM_ENABLE);
 783         }
 784
 785         tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 786         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 787 }
 788
 789 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 790 {
 791         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 792         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 793         u32 tmp;
 794
 795         intel_panel_set_pwm_level(old_conn_state, val);
 796
 797         tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
 798         intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 799
 800         tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 801         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 802 }
 803
 804 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 805 {
 806         intel_panel_set_pwm_level(old_conn_state, val);
 807 }
 808
 809 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 810 {
 811         struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 812         u32 tmp;
 813
 814         intel_panel_set_pwm_level(old_conn_state, val);
 815
 816         tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
 817         intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 818 }
 819
 820 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 821 {
 822         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 823         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 824         enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 825         u32 tmp;
 826
 827         intel_panel_set_pwm_level(old_conn_state, val);
 828
 829         tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
 830         intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
 831                        tmp & ~BLM_PWM_ENABLE);
 832 }
 833
 834 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 835 {
 836         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 837         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 838         struct intel_panel *panel = &connector->panel;
 839         u32 tmp;
 840
 841         intel_panel_set_pwm_level(old_conn_state, val);
 842
 843         tmp = intel_de_read(dev_priv,
 844                             BXT_BLC_PWM_CTL(panel->backlight.controller));
 845         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
 846                        tmp & ~BXT_BLC_PWM_ENABLE);
 847
 848         if (panel->backlight.controller == 1) {
 849                 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
 850                 val &= ~UTIL_PIN_ENABLE;
 851                 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
 852         }
 853 }
 854
 855 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 856 {
 857         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 858         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 859         struct intel_panel *panel = &connector->panel;
 860         u32 tmp;
 861
 862         intel_panel_set_pwm_level(old_conn_state, val);
 863
 864         tmp = intel_de_read(dev_priv,
 865                             BXT_BLC_PWM_CTL(panel->backlight.controller));
 866         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
 867                        tmp & ~BXT_BLC_PWM_ENABLE);
 868 }
 869
 870 static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
 871 {
 872         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 873         struct intel_panel *panel = &connector->panel;
 874
 875         panel->backlight.pwm_state.enabled = false;
 876         pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
 877 }
 878
 879 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
 880 {
 881         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 882         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 883         struct intel_panel *panel = &connector->panel;
 884
 885         if (!panel->backlight.present)
 886                 return;
 887
 888         /*
 889          * Do not disable backlight on the vga_switcheroo path. When switching
 890          * away from i915, the other client may depend on i915 to handle the
 891          * backlight. This will leave the backlight on unnecessarily when
 892          * another client is not activated.
 893          */
 894         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 895                 drm_dbg_kms(&dev_priv->drm,
 896                             "Skipping backlight disable on vga switch\n");
 897                 return;
 898         }
 899
 900         mutex_lock(&dev_priv->backlight_lock);
 901
 902         if (panel->backlight.device)
 903                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 904         panel->backlight.enabled = false;
 905         panel->backlight.funcs->disable(old_conn_state, 0);
 906
 907         mutex_unlock(&dev_priv->backlight_lock);
 908 }
 909
 910 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 911                                  const struct drm_connector_state *conn_state, u32 level)
 912 {
 913         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 914         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 915         struct intel_panel *panel = &connector->panel;
 916         u32 pch_ctl1, pch_ctl2, schicken;
 917
 918         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 919         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 920                 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
 921                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 922                 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
 923         }
 924
 925         if (HAS_PCH_LPT(dev_priv)) {
 926                 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
 927                 if (panel->backlight.alternate_pwm_increment)
 928                         schicken |= LPT_PWM_GRANULARITY;
 929                 else
 930                         schicken &= ~LPT_PWM_GRANULARITY;
 931                 intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
 932         } else {
 933                 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
 934                 if (panel->backlight.alternate_pwm_increment)
 935                         schicken |= SPT_PWM_GRANULARITY;
 936                 else
 937                         schicken &= ~SPT_PWM_GRANULARITY;
 938                 intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
 939         }
 940
 941         pch_ctl2 = panel->backlight.pwm_level_max << 16;
 942         intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
 943
 944         pch_ctl1 = 0;
 945         if (panel->backlight.active_low_pwm)
 946                 pch_ctl1 |= BLM_PCH_POLARITY;
 947
 948         /* After LPT, override is the default. */
 949         if (HAS_PCH_LPT(dev_priv))
 950                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 951
 952         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
 953         intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
 954         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
 955                        pch_ctl1 | BLM_PCH_PWM_ENABLE);
 956
 957         /* This won't stick until the above enable. */
 958         intel_panel_set_pwm_level(conn_state, level);
 959 }
 960
 961 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 962                                  const struct drm_connector_state *conn_state, u32 level)
 963 {
 964         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 965         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 966         struct intel_panel *panel = &connector->panel;
 967         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 968         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 969
 970         cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
 971         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 972                 drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
 973                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 974                 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
 975         }
 976
 977         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 978         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 979                 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
 980                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 981                 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
 982         }
 983
 984         if (cpu_transcoder == TRANSCODER_EDP)
 985                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 986         else
 987                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 988         intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
 989         intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
 990         intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 991
 992         /* This won't stick until the above enable. */
 993         intel_panel_set_pwm_level(conn_state, level);
 994
 995         pch_ctl2 = panel->backlight.pwm_level_max << 16;
 996         intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
 997
 998         pch_ctl1 = 0;
 999         if (panel->backlight.active_low_pwm)
1000                 pch_ctl1 |= BLM_PCH_POLARITY;
1001
1002         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
1003         intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
1004         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1005                        pch_ctl1 | BLM_PCH_PWM_ENABLE);
1006 }
1007
1008 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
1009                                   const struct drm_connector_state *conn_state, u32 level)
1010 {
1011         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1012         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1013         struct intel_panel *panel = &connector->panel;
1014         u32 ctl, freq;
1015
1016         ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1017         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
1018                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1019                 intel_de_write(dev_priv, BLC_PWM_CTL, 0);
1020         }
1021
1022         freq = panel->backlight.pwm_level_max;
1023         if (panel->backlight.combination_mode)
1024                 freq /= 0xff;
1025
1026         ctl = freq << 17;
1027         if (panel->backlight.combination_mode)
1028                 ctl |= BLM_LEGACY_MODE;
1029         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
1030                 ctl |= BLM_POLARITY_PNV;
1031
1032         intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1033         intel_de_posting_read(dev_priv, BLC_PWM_CTL);
1034
1035         /* XXX: combine this into above write? */
1036         intel_panel_set_pwm_level(conn_state, level);
1037
1038         /*
1039          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
1040          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
1041          * that has backlight.
1042          */
1043         if (IS_GEN(dev_priv, 2))
1044                 intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
1045 }
1046
1047 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
1048                                   const struct drm_connector_state *conn_state, u32 level)
1049 {
1050         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1051         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1052         struct intel_panel *panel = &connector->panel;
1053         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1054         u32 ctl, ctl2, freq;
1055
1056         ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1057         if (ctl2 & BLM_PWM_ENABLE) {
1058                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1059                 ctl2 &= ~BLM_PWM_ENABLE;
1060                 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1061         }
1062
1063         freq = panel->backlight.pwm_level_max;
1064         if (panel->backlight.combination_mode)
1065                 freq /= 0xff;
1066
1067         ctl = freq << 16;
1068         intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1069
1070         ctl2 = BLM_PIPE(pipe);
1071         if (panel->backlight.combination_mode)
1072                 ctl2 |= BLM_COMBINATION_MODE;
1073         if (panel->backlight.active_low_pwm)
1074                 ctl2 |= BLM_POLARITY_I965;
1075         intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1076         intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
1077         intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1078
1079         intel_panel_set_pwm_level(conn_state, level);
1080 }
1081
1082 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1083                                  const struct drm_connector_state *conn_state, u32 level)
1084 {
1085         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1086         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1087         struct intel_panel *panel = &connector->panel;
1088         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1089         u32 ctl, ctl2;
1090
1091         ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1092         if (ctl2 & BLM_PWM_ENABLE) {
1093                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1094                 ctl2 &= ~BLM_PWM_ENABLE;
1095                 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1096         }
1097
1098         ctl = panel->backlight.pwm_level_max << 16;
1099         intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
1100
1101         /* XXX: combine this into above write? */
1102         intel_panel_set_pwm_level(conn_state, level);
1103
1104         ctl2 = 0;
1105         if (panel->backlight.active_low_pwm)
1106                 ctl2 |= BLM_POLARITY_I965;
1107         intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1108         intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1109         intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
1110                        ctl2 | BLM_PWM_ENABLE);
1111 }
1112
1113 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1114                                  const struct drm_connector_state *conn_state, u32 level)
1115 {
1116         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1117         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1118         struct intel_panel *panel = &connector->panel;
1119         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1120         u32 pwm_ctl, val;
1121
1122         /* Controller 1 uses the utility pin. */
1123         if (panel->backlight.controller == 1) {
1124                 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1125                 if (val & UTIL_PIN_ENABLE) {
1126                         drm_dbg_kms(&dev_priv->drm,
1127                                     "util pin already enabled\n");
1128                         val &= ~UTIL_PIN_ENABLE;
1129                         intel_de_write(dev_priv, UTIL_PIN_CTL, val);
1130                 }
1131
1132                 val = 0;
1133                 if (panel->backlight.util_pin_active_low)
1134                         val |= UTIL_PIN_POLARITY;
1135                 intel_de_write(dev_priv, UTIL_PIN_CTL,
1136                                val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1137         }
1138
1139         pwm_ctl = intel_de_read(dev_priv,
1140                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1141         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1142                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1143                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1144                 intel_de_write(dev_priv,
1145                                BXT_BLC_PWM_CTL(panel->backlight.controller),
1146                                pwm_ctl);
1147         }
1148
1149         intel_de_write(dev_priv,
1150                        BXT_BLC_PWM_FREQ(panel->backlight.controller),
1151                        panel->backlight.pwm_level_max);
1152
1153         intel_panel_set_pwm_level(conn_state, level);
1154
1155         pwm_ctl = 0;
1156         if (panel->backlight.active_low_pwm)
1157                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1158
1159         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1160                        pwm_ctl);
1161         intel_de_posting_read(dev_priv,
1162                               BXT_BLC_PWM_CTL(panel->backlight.controller));
1163         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1164                        pwm_ctl | BXT_BLC_PWM_ENABLE);
1165 }
1166
1167 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1168                                  const struct drm_connector_state *conn_state, u32 level)
1169 {
1170         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1171         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1172         struct intel_panel *panel = &connector->panel;
1173         u32 pwm_ctl;
1174
1175         pwm_ctl = intel_de_read(dev_priv,
1176                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1177         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1178                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1179                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1180                 intel_de_write(dev_priv,
1181                                BXT_BLC_PWM_CTL(panel->backlight.controller),
1182                                pwm_ctl);
1183         }
1184
1185         intel_de_write(dev_priv,
1186                        BXT_BLC_PWM_FREQ(panel->backlight.controller),
1187                        panel->backlight.pwm_level_max);
1188
1189         intel_panel_set_pwm_level(conn_state, level);
1190
1191         pwm_ctl = 0;
1192         if (panel->backlight.active_low_pwm)
1193                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1194
1195         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1196                        pwm_ctl);
1197         intel_de_posting_read(dev_priv,
1198                               BXT_BLC_PWM_CTL(panel->backlight.controller));
1199         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1200                        pwm_ctl | BXT_BLC_PWM_ENABLE);
1201 }
1202
1203 static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1204                                      const struct drm_connector_state *conn_state, u32 level)
1205 {
1206         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1207         struct intel_panel *panel = &connector->panel;
1208
1209         pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
1210         panel->backlight.pwm_state.enabled = true;
1211         pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1212 }
1213
1214 static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1215                                            const struct drm_connector_state *conn_state)
1216 {
1217         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1218         struct intel_panel *panel = &connector->panel;
1219
1220         WARN_ON(panel->backlight.max == 0);
1221
1222         if (panel->backlight.level <= panel->backlight.min) {
1223                 panel->backlight.level = panel->backlight.max;
1224                 if (panel->backlight.device)
1225                         panel->backlight.device->props.brightness =
1226                                 scale_hw_to_user(connector,
1227                                                  panel->backlight.level,
1228                                                  panel->backlight.device->props.max_brightness);
1229         }
1230
1231         panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
1232         panel->backlight.enabled = true;
1233         if (panel->backlight.device)
1234                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1235 }
1236
1237 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1238                                   const struct drm_connector_state *conn_state)
1239 {
1240         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1241         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1242         struct intel_panel *panel = &connector->panel;
1243         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1244
1245         if (!panel->backlight.present)
1246                 return;
1247
1248         drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
1249
1250         mutex_lock(&dev_priv->backlight_lock);
1251
1252         __intel_panel_enable_backlight(crtc_state, conn_state);
1253
1254         mutex_unlock(&dev_priv->backlight_lock);
1255 }
1256
1257 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1258 static u32 intel_panel_get_backlight(struct intel_connector *connector)
1259 {
1260         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1261         struct intel_panel *panel = &connector->panel;
1262         u32 val = 0;
1263
1264         mutex_lock(&dev_priv->backlight_lock);
1265
1266         if (panel->backlight.enabled)
1267                 val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
1268
1269         mutex_unlock(&dev_priv->backlight_lock);
1270
1271         drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
1272         return val;
1273 }
1274
1275 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
1276 static u32 scale_user_to_hw(struct intel_connector *connector,
1277                             u32 user_level, u32 user_max)
1278 {
1279         struct intel_panel *panel = &connector->panel;
1280
1281         return scale(user_level, 0, user_max,
1282                      panel->backlight.min, panel->backlight.max);
1283 }
1284
1285 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
1286 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1287                                       u32 user_level, u32 user_max)
1288 {
1289         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1290         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1291         struct intel_panel *panel = &connector->panel;
1292         u32 hw_level;
1293
1294         if (!panel->backlight.present)
1295                 return;
1296
1297         mutex_lock(&dev_priv->backlight_lock);
1298
1299         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1300
1301         hw_level = scale_user_to_hw(connector, user_level, user_max);
1302         panel->backlight.level = hw_level;
1303
1304         if (panel->backlight.enabled)
1305                 intel_panel_actually_set_backlight(conn_state, hw_level);
1306
1307         mutex_unlock(&dev_priv->backlight_lock);
1308 }
1309
1310 static int intel_backlight_device_update_status(struct backlight_device *bd)
1311 {
1312         struct intel_connector *connector = bl_get_data(bd);
1313         struct intel_panel *panel = &connector->panel;
1314         struct drm_device *dev = connector->base.dev;
1315
1316         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1317         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1318                       bd->props.brightness, bd->props.max_brightness);
1319         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1320                                   bd->props.max_brightness);
1321
1322         /*
1323          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1324          * backlight class device does not make it easy to to differentiate
1325          * between callbacks for brightness and bl_power, so our backlight_power
1326          * callback needs to take this into account.
1327          */
1328         if (panel->backlight.enabled) {
1329                 if (panel->backlight.power) {
1330                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1331                                 bd->props.brightness != 0;
1332                         panel->backlight.power(connector, enable);
1333                 }
1334         } else {
1335                 bd->props.power = FB_BLANK_POWERDOWN;
1336         }
1337
1338         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1339         return 0;
1340 }
1341
1342 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1343 {
1344         struct intel_connector *connector = bl_get_data(bd);
1345         struct drm_device *dev = connector->base.dev;
1346         struct drm_i915_private *dev_priv = to_i915(dev);
1347         intel_wakeref_t wakeref;
1348         int ret = 0;
1349
1350         with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
1351                 u32 hw_level;
1352
1353                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1354
1355                 hw_level = intel_panel_get_backlight(connector);
1356                 ret = scale_hw_to_user(connector,
1357                                        hw_level, bd->props.max_brightness);
1358
1359                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1360         }
1361
1362         return ret;
1363 }
1364
1365 static const struct backlight_ops intel_backlight_device_ops = {
1366         .update_status = intel_backlight_device_update_status,
1367         .get_brightness = intel_backlight_device_get_brightness,
1368 };
1369
1370 int intel_backlight_device_register(struct intel_connector *connector)
1371 {
1372         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1373         struct intel_panel *panel = &connector->panel;
1374         struct backlight_properties props;
1375
1376         if (WARN_ON(panel->backlight.device))
1377                 return -ENODEV;
1378
1379         if (!panel->backlight.present)
1380                 return 0;
1381
1382         WARN_ON(panel->backlight.max == 0);
1383
1384         memset(&props, 0, sizeof(props));
1385         props.type = BACKLIGHT_RAW;
1386
1387         /*
1388          * Note: Everything should work even if the backlight device max
1389          * presented to the userspace is arbitrarily chosen.
1390          */
1391         props.max_brightness = panel->backlight.max;
1392         props.brightness = scale_hw_to_user(connector,
1393                                             panel->backlight.level,
1394                                             props.max_brightness);
1395
1396         if (panel->backlight.enabled)
1397                 props.power = FB_BLANK_UNBLANK;
1398         else
1399                 props.power = FB_BLANK_POWERDOWN;
1400
1401         /*
1402          * Note: using the same name independent of the connector prevents
1403          * registration of multiple backlight devices in the driver.
1404          */
1405         panel->backlight.device =
1406                 backlight_device_register("intel_backlight",
1407                                           connector->base.kdev,
1408                                           connector,
1409                                           &intel_backlight_device_ops, &props);
1410
1411         if (IS_ERR(panel->backlight.device)) {
1412                 drm_err(&i915->drm, "Failed to register backlight: %ld\n",
1413                         PTR_ERR(panel->backlight.device));
1414                 panel->backlight.device = NULL;
1415                 return -ENODEV;
1416         }
1417
1418         drm_dbg_kms(&i915->drm,
1419                     "Connector %s backlight sysfs interface registered\n",
1420                     connector->base.name);
1421
1422         return 0;
1423 }
1424
1425 void intel_backlight_device_unregister(struct intel_connector *connector)
1426 {
1427         struct intel_panel *panel = &connector->panel;
1428
1429         if (panel->backlight.device) {
1430                 backlight_device_unregister(panel->backlight.device);
1431                 panel->backlight.device = NULL;
1432         }
1433 }
1434 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1435
1436 /*
1437  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1438  *      PWM increment = 1
1439  */
1440 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1441 {
1442         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1443
1444         return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1445                                  pwm_freq_hz);
1446 }
1447
1448 /*
1449  * BXT: PWM clock frequency = 19.2 MHz.
1450  */
1451 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1452 {
1453         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1454 }
1455
1456 /*
1457  * SPT: This value represents the period of the PWM stream in clock periods
1458  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1459  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1460  */
1461 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1462 {
1463         struct intel_panel *panel = &connector->panel;
1464         u32 mul;
1465
1466         if (panel->backlight.alternate_pwm_increment)
1467                 mul = 128;
1468         else
1469                 mul = 16;
1470
1471         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1472 }
1473
1474 /*
1475  * LPT: This value represents the period of the PWM stream in clock periods
1476  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1477  * LPT SOUTH_CHICKEN2 register bit 5).
1478  */
1479 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1480 {
1481         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1482         struct intel_panel *panel = &connector->panel;
1483         u32 mul, clock;
1484
1485         if (panel->backlight.alternate_pwm_increment)
1486                 mul = 16;
1487         else
1488                 mul = 128;
1489
1490         if (HAS_PCH_LPT_H(dev_priv))
1491                 clock = MHz(135); /* LPT:H */
1492         else
1493                 clock = MHz(24); /* LPT:LP */
1494
1495         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1496 }
1497
1498 /*
1499  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1500  * display raw clocks multiplied by 128.
1501  */
1502 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1503 {
1504         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1505
1506         return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1507                                  pwm_freq_hz * 128);
1508 }
1509
1510 /*
1511  * Gen2: This field determines the number of time base events (display core
1512  * clock frequency/32) in total for a complete cycle of modulated backlight
1513  * control.
1514  *
1515  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1516  * divided by 32.
1517  */
1518 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1519 {
1520         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1521         int clock;
1522
1523         if (IS_PINEVIEW(dev_priv))
1524                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1525         else
1526                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1527
1528         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1529 }
1530
1531 /*
1532  * Gen4: This value represents the period of the PWM stream in display core
1533  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1534  *
1535  */
1536 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1537 {
1538         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1539         int clock;
1540
1541         if (IS_G4X(dev_priv))
1542                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1543         else
1544                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1545
1546         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1547 }
1548
1549 /*
1550  * VLV: This value represents the period of the PWM stream in display core
1551  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1552  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1553  */
1554 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1555 {
1556         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1557         int mul, clock;
1558
1559         if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1560                 if (IS_CHERRYVIEW(dev_priv))
1561                         clock = KHz(19200);
1562                 else
1563                         clock = MHz(25);
1564                 mul = 16;
1565         } else {
1566                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1567                 mul = 128;
1568         }
1569
1570         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1571 }
1572
1573 static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
1574 {
1575         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1576
1577         if (pwm_freq_hz) {
1578                 drm_dbg_kms(&dev_priv->drm,
1579                             "VBT defined backlight frequency %u Hz\n",
1580                             pwm_freq_hz);
1581         } else {
1582                 pwm_freq_hz = 200;
1583                 drm_dbg_kms(&dev_priv->drm,
1584                             "default backlight frequency %u Hz\n",
1585                             pwm_freq_hz);
1586         }
1587
1588         return pwm_freq_hz;
1589 }
1590
1591 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1592 {
1593         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1594         struct intel_panel *panel = &connector->panel;
1595         u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
1596         u32 pwm;
1597
1598         if (!panel->backlight.pwm_funcs->hz_to_pwm) {
1599                 drm_dbg_kms(&dev_priv->drm,
1600                             "backlight frequency conversion not supported\n");
1601                 return 0;
1602         }
1603
1604         pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
1605         if (!pwm) {
1606                 drm_dbg_kms(&dev_priv->drm,
1607                             "backlight frequency conversion failed\n");
1608                 return 0;
1609         }
1610
1611         return pwm;
1612 }
1613
1614 /*
1615  * Note: The setup hooks can't assume pipe is set!
1616  */
1617 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1618 {
1619         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1620         struct intel_panel *panel = &connector->panel;
1621         int min;
1622
1623         drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
1624
1625         /*
1626          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1627          * to problems. There are such machines out there. Either our
1628          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1629          * against this by letting the minimum be at most (arbitrarily chosen)
1630          * 25% of the max.
1631          */
1632         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1633         if (min != dev_priv->vbt.backlight.min_brightness) {
1634                 drm_dbg_kms(&dev_priv->drm,
1635                             "clamping VBT min backlight %d/255 to %d/255\n",
1636                             dev_priv->vbt.backlight.min_brightness, min);
1637         }
1638
1639         /* vbt value is a coefficient in range [0..255] */
1640         return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
1641 }
1642
1643 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1644 {
1645         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1646         struct intel_panel *panel = &connector->panel;
1647         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1648         bool alt, cpu_mode;
1649
1650         if (HAS_PCH_LPT(dev_priv))
1651                 alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1652         else
1653                 alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1654         panel->backlight.alternate_pwm_increment = alt;
1655
1656         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1657         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1658
1659         pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1660         panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1661
1662         cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1663
1664         if (!panel->backlight.pwm_level_max)
1665                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1666
1667         if (!panel->backlight.pwm_level_max)
1668                 return -ENODEV;
1669
1670         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1671
1672         panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1673
1674         cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(dev_priv) &&
1675                    !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1676                    (cpu_ctl2 & BLM_PWM_ENABLE);
1677
1678         if (cpu_mode) {
1679                 val = pch_get_backlight(connector, unused);
1680
1681                 drm_dbg_kms(&dev_priv->drm,
1682                             "CPU backlight register was enabled, switching to PCH override\n");
1683
1684                 /* Write converted CPU PWM value to PCH override register */
1685                 lpt_set_backlight(connector->base.state, val);
1686                 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1687                                pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1688
1689                 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
1690                                cpu_ctl2 & ~BLM_PWM_ENABLE);
1691         }
1692
1693         return 0;
1694 }
1695
1696 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1697 {
1698         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1699         struct intel_panel *panel = &connector->panel;
1700         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
1701
1702         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1703         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1704
1705         pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1706         panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1707
1708         if (!panel->backlight.pwm_level_max)
1709                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1710
1711         if (!panel->backlight.pwm_level_max)
1712                 return -ENODEV;
1713
1714         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1715
1716         cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1717         panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1718                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1719
1720         return 0;
1721 }
1722
1723 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1724 {
1725         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1726         struct intel_panel *panel = &connector->panel;
1727         u32 ctl, val;
1728
1729         ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1730
1731         if (IS_GEN(dev_priv, 2) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1732                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1733
1734         if (IS_PINEVIEW(dev_priv))
1735                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1736
1737         panel->backlight.pwm_level_max = ctl >> 17;
1738
1739         if (!panel->backlight.pwm_level_max) {
1740                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1741                 panel->backlight.pwm_level_max >>= 1;
1742         }
1743
1744         if (!panel->backlight.pwm_level_max)
1745                 return -ENODEV;
1746
1747         if (panel->backlight.combination_mode)
1748                 panel->backlight.pwm_level_max *= 0xff;
1749
1750         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1751
1752         val = i9xx_get_backlight(connector, unused);
1753         val = intel_panel_invert_pwm_level(connector, val);
1754         val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
1755
1756         panel->backlight.pwm_enabled = val != 0;
1757
1758         return 0;
1759 }
1760
1761 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1762 {
1763         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1764         struct intel_panel *panel = &connector->panel;
1765         u32 ctl, ctl2;
1766
1767         ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1768         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1769         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1770
1771         ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1772         panel->backlight.pwm_level_max = ctl >> 16;
1773
1774         if (!panel->backlight.pwm_level_max)
1775                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1776
1777         if (!panel->backlight.pwm_level_max)
1778                 return -ENODEV;
1779
1780         if (panel->backlight.combination_mode)
1781                 panel->backlight.pwm_level_max *= 0xff;
1782
1783         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1784
1785         panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1786
1787         return 0;
1788 }
1789
1790 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1791 {
1792         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1793         struct intel_panel *panel = &connector->panel;
1794         u32 ctl, ctl2;
1795
1796         if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
1797                 return -ENODEV;
1798
1799         ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1800         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1801
1802         ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
1803         panel->backlight.pwm_level_max = ctl >> 16;
1804
1805         if (!panel->backlight.pwm_level_max)
1806                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1807
1808         if (!panel->backlight.pwm_level_max)
1809                 return -ENODEV;
1810
1811         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1812
1813         panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1814
1815         return 0;
1816 }
1817
1818 static int
1819 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1820 {
1821         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1822         struct intel_panel *panel = &connector->panel;
1823         u32 pwm_ctl, val;
1824
1825         panel->backlight.controller = dev_priv->vbt.backlight.controller;
1826
1827         pwm_ctl = intel_de_read(dev_priv,
1828                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1829
1830         /* Controller 1 uses the utility pin. */
1831         if (panel->backlight.controller == 1) {
1832                 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1833                 panel->backlight.util_pin_active_low =
1834                                         val & UTIL_PIN_POLARITY;
1835         }
1836
1837         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1838         panel->backlight.pwm_level_max =
1839                 intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1840
1841         if (!panel->backlight.pwm_level_max)
1842                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1843
1844         if (!panel->backlight.pwm_level_max)
1845                 return -ENODEV;
1846
1847         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1848
1849         panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1850
1851         return 0;
1852 }
1853
1854 static int
1855 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1856 {
1857         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1858         struct intel_panel *panel = &connector->panel;
1859         u32 pwm_ctl;
1860
1861         /*
1862          * CNP has the BXT implementation of backlight, but with only one
1863          * controller. TODO: ICP has multiple controllers but we only use
1864          * controller 0 for now.
1865          */
1866         panel->backlight.controller = 0;
1867
1868         pwm_ctl = intel_de_read(dev_priv,
1869                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1870
1871         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1872         panel->backlight.pwm_level_max =
1873                 intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1874
1875         if (!panel->backlight.pwm_level_max)
1876                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1877
1878         if (!panel->backlight.pwm_level_max)
1879                 return -ENODEV;
1880
1881         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1882
1883         panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1884
1885         return 0;
1886 }
1887
1888 static int ext_pwm_setup_backlight(struct intel_connector *connector,
1889                                    enum pipe pipe)
1890 {
1891         struct drm_device *dev = connector->base.dev;
1892         struct drm_i915_private *dev_priv = to_i915(dev);
1893         struct intel_panel *panel = &connector->panel;
1894         const char *desc;
1895         u32 level;
1896
1897         /* Get the right PWM chip for DSI backlight according to VBT */
1898         if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1899                 panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
1900                 desc = "PMIC";
1901         } else {
1902                 panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
1903                 desc = "SoC";
1904         }
1905
1906         if (IS_ERR(panel->backlight.pwm)) {
1907                 drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n",
1908                         desc);
1909                 panel->backlight.pwm = NULL;
1910                 return -ENODEV;
1911         }
1912
1913         panel->backlight.pwm_level_max = 100; /* 100% */
1914         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1915
1916         if (pwm_is_enabled(panel->backlight.pwm)) {
1917                 /* PWM is already enabled, use existing settings */
1918                 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1919
1920                 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
1921                                                     100);
1922                 level = intel_panel_invert_pwm_level(connector, level);
1923                 panel->backlight.pwm_enabled = true;
1924
1925                 drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
1926                             NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
1927                             get_vbt_pwm_freq(dev_priv), level);
1928         } else {
1929                 /* Set period from VBT frequency, leave other settings at 0. */
1930                 panel->backlight.pwm_state.period =
1931                         NSEC_PER_SEC / get_vbt_pwm_freq(dev_priv);
1932         }
1933
1934         drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
1935                  desc);
1936         return 0;
1937 }
1938
1939 static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
1940 {
1941         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1942         struct intel_panel *panel = &connector->panel;
1943
1944         panel->backlight.pwm_funcs->set(conn_state,
1945                                        intel_panel_invert_pwm_level(connector, level));
1946 }
1947
1948 static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
1949 {
1950         struct intel_panel *panel = &connector->panel;
1951
1952         return intel_panel_invert_pwm_level(connector,
1953                                             panel->backlight.pwm_funcs->get(connector, pipe));
1954 }
1955
1956 static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1957                                        const struct drm_connector_state *conn_state, u32 level)
1958 {
1959         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1960         struct intel_panel *panel = &connector->panel;
1961
1962         panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
1963                                            intel_panel_invert_pwm_level(connector, level));
1964 }
1965
1966 static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
1967 {
1968         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1969         struct intel_panel *panel = &connector->panel;
1970
1971         panel->backlight.pwm_funcs->disable(conn_state,
1972                                             intel_panel_invert_pwm_level(connector, level));
1973 }
1974
1975 static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1976 {
1977         struct intel_panel *panel = &connector->panel;
1978         int ret = panel->backlight.pwm_funcs->setup(connector, pipe);
1979
1980         if (ret < 0)
1981                 return ret;
1982
1983         panel->backlight.min = panel->backlight.pwm_level_min;
1984         panel->backlight.max = panel->backlight.pwm_level_max;
1985         panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
1986         panel->backlight.enabled = panel->backlight.pwm_enabled;
1987
1988         return 0;
1989 }
1990
1991 void intel_panel_update_backlight(struct intel_atomic_state *state,
1992                                   struct intel_encoder *encoder,
1993                                   const struct intel_crtc_state *crtc_state,
1994                                   const struct drm_connector_state *conn_state)
1995 {
1996         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1997         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1998         struct intel_panel *panel = &connector->panel;
1999
2000         if (!panel->backlight.present)
2001                 return;
2002
2003         mutex_lock(&dev_priv->backlight_lock);
2004         if (!panel->backlight.enabled)
2005                 __intel_panel_enable_backlight(crtc_state, conn_state);
2006
2007         mutex_unlock(&dev_priv->backlight_lock);
2008 }
2009
2010 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
2011 {
2012         struct drm_i915_private *dev_priv = to_i915(connector->dev);
2013         struct intel_connector *intel_connector = to_intel_connector(connector);
2014         struct intel_panel *panel = &intel_connector->panel;
2015         int ret;
2016
2017         if (!dev_priv->vbt.backlight.present) {
2018                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
2019                         drm_dbg_kms(&dev_priv->drm,
2020                                     "no backlight present per VBT, but present per quirk\n");
2021                 } else {
2022                         drm_dbg_kms(&dev_priv->drm,
2023                                     "no backlight present per VBT\n");
2024                         return 0;
2025                 }
2026         }
2027
2028         /* ensure intel_panel has been initialized first */
2029         if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.funcs))
2030                 return -ENODEV;
2031
2032         /* set level and max in panel struct */
2033         mutex_lock(&dev_priv->backlight_lock);
2034         ret = panel->backlight.funcs->setup(intel_connector, pipe);
2035         mutex_unlock(&dev_priv->backlight_lock);
2036
2037         if (ret) {
2038                 drm_dbg_kms(&dev_priv->drm,
2039                             "failed to setup backlight for connector %s\n",
2040                             connector->name);
2041                 return ret;
2042         }
2043
2044         panel->backlight.present = true;
2045
2046         drm_dbg_kms(&dev_priv->drm,
2047                     "Connector %s backlight initialized, %s, brightness %u/%u\n",
2048                     connector->name,
2049                     enableddisabled(panel->backlight.enabled),
2050                     panel->backlight.level, panel->backlight.max);
2051
2052         return 0;
2053 }
2054
2055 static void intel_panel_destroy_backlight(struct intel_panel *panel)
2056 {
2057         /* dispose of the pwm */
2058         if (panel->backlight.pwm)
2059                 pwm_put(panel->backlight.pwm);
2060
2061         panel->backlight.present = false;
2062 }
2063
2064 static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
2065         .setup = bxt_setup_backlight,
2066         .enable = bxt_enable_backlight,
2067         .disable = bxt_disable_backlight,
2068         .set = bxt_set_backlight,
2069         .get = bxt_get_backlight,
2070         .hz_to_pwm = bxt_hz_to_pwm,
2071 };
2072
2073 static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
2074         .setup = cnp_setup_backlight,
2075         .enable = cnp_enable_backlight,
2076         .disable = cnp_disable_backlight,
2077         .set = bxt_set_backlight,
2078         .get = bxt_get_backlight,
2079         .hz_to_pwm = cnp_hz_to_pwm,
2080 };
2081
2082 static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
2083         .setup = lpt_setup_backlight,
2084         .enable = lpt_enable_backlight,
2085         .disable = lpt_disable_backlight,
2086         .set = lpt_set_backlight,
2087         .get = lpt_get_backlight,
2088         .hz_to_pwm = lpt_hz_to_pwm,
2089 };
2090
2091 static const struct intel_panel_bl_funcs spt_pwm_funcs = {
2092         .setup = lpt_setup_backlight,
2093         .enable = lpt_enable_backlight,
2094         .disable = lpt_disable_backlight,
2095         .set = lpt_set_backlight,
2096         .get = lpt_get_backlight,
2097         .hz_to_pwm = spt_hz_to_pwm,
2098 };
2099
2100 static const struct intel_panel_bl_funcs pch_pwm_funcs = {
2101         .setup = pch_setup_backlight,
2102         .enable = pch_enable_backlight,
2103         .disable = pch_disable_backlight,
2104         .set = pch_set_backlight,
2105         .get = pch_get_backlight,
2106         .hz_to_pwm = pch_hz_to_pwm,
2107 };
2108
2109 static const struct intel_panel_bl_funcs ext_pwm_funcs = {
2110         .setup = ext_pwm_setup_backlight,
2111         .enable = ext_pwm_enable_backlight,
2112         .disable = ext_pwm_disable_backlight,
2113         .set = ext_pwm_set_backlight,
2114         .get = ext_pwm_get_backlight,
2115 };
2116
2117 static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
2118         .setup = vlv_setup_backlight,
2119         .enable = vlv_enable_backlight,
2120         .disable = vlv_disable_backlight,
2121         .set = vlv_set_backlight,
2122         .get = vlv_get_backlight,
2123         .hz_to_pwm = vlv_hz_to_pwm,
2124 };
2125
2126 static const struct intel_panel_bl_funcs i965_pwm_funcs = {
2127         .setup = i965_setup_backlight,
2128         .enable = i965_enable_backlight,
2129         .disable = i965_disable_backlight,
2130         .set = i9xx_set_backlight,
2131         .get = i9xx_get_backlight,
2132         .hz_to_pwm = i965_hz_to_pwm,
2133 };
2134
2135 static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
2136         .setup = i9xx_setup_backlight,
2137         .enable = i9xx_enable_backlight,
2138         .disable = i9xx_disable_backlight,
2139         .set = i9xx_set_backlight,
2140         .get = i9xx_get_backlight,
2141         .hz_to_pwm = i9xx_hz_to_pwm,
2142 };
2143
2144 static const struct intel_panel_bl_funcs pwm_bl_funcs = {
2145         .setup = intel_pwm_setup_backlight,
2146         .enable = intel_pwm_enable_backlight,
2147         .disable = intel_pwm_disable_backlight,
2148         .set = intel_pwm_set_backlight,
2149         .get = intel_pwm_get_backlight,
2150 };
2151
2152 /* Set up chip specific backlight functions */
2153 static void
2154 intel_panel_init_backlight_funcs(struct intel_panel *panel)
2155 {
2156         struct intel_connector *connector =
2157                 container_of(panel, struct intel_connector, panel);
2158         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
2159
2160         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
2161             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
2162                 return;
2163
2164         if (IS_GEN9_LP(dev_priv)) {
2165                 panel->backlight.pwm_funcs = &bxt_pwm_funcs;
2166         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
2167                 panel->backlight.pwm_funcs = &cnp_pwm_funcs;
2168         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
2169                 if (HAS_PCH_LPT(dev_priv))
2170                         panel->backlight.pwm_funcs = &lpt_pwm_funcs;
2171                 else
2172                         panel->backlight.pwm_funcs = &spt_pwm_funcs;
2173         } else if (HAS_PCH_SPLIT(dev_priv)) {
2174                 panel->backlight.pwm_funcs = &pch_pwm_funcs;
2175         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
2176                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
2177                         panel->backlight.pwm_funcs = &ext_pwm_funcs;
2178                 } else {
2179                         panel->backlight.pwm_funcs = &vlv_pwm_funcs;
2180                 }
2181         } else if (IS_GEN(dev_priv, 4)) {
2182                 panel->backlight.pwm_funcs = &i965_pwm_funcs;
2183         } else {
2184                 panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
2185         }
2186
2187         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
2188             intel_dp_aux_init_backlight_funcs(connector) == 0)
2189                 return;
2190
2191         /* We're using a standard PWM backlight interface */
2192         panel->backlight.funcs = &pwm_bl_funcs;
2193 }
2194
2195 enum drm_connector_status
2196 intel_panel_detect(struct drm_connector *connector, bool force)
2197 {
2198         struct drm_i915_private *i915 = to_i915(connector->dev);
2199
2200         if (!INTEL_DISPLAY_ENABLED(i915))
2201                 return connector_status_disconnected;
2202
2203         return connector_status_connected;
2204 }
2205
2206 int intel_panel_init(struct intel_panel *panel,
2207                      struct drm_display_mode *fixed_mode,
2208                      struct drm_display_mode *downclock_mode)
2209 {
2210         intel_panel_init_backlight_funcs(panel);
2211
2212         panel->fixed_mode = fixed_mode;
2213         panel->downclock_mode = downclock_mode;
2214
2215         return 0;
2216 }
2217
2218 void intel_panel_fini(struct intel_panel *panel)
2219 {
2220         struct intel_connector *intel_connector =
2221                 container_of(panel, struct intel_connector, panel);
2222
2223         intel_panel_destroy_backlight(panel);
2224
2225         if (panel->fixed_mode)
2226                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2227
2228         if (panel->downclock_mode)
2229                 drm_mode_destroy(intel_connector->base.dev,
2230                                 panel->downclock_mode);
2231 }