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 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 515                                           u32 val)
 516 {
 517         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 518         struct intel_panel *panel = &connector->panel;
 519
 520         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
 521
 522         if (dev_priv->params.invert_brightness < 0)
 523                 return val;
 524
 525         if (dev_priv->params.invert_brightness > 0 ||
 526             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 527                 return panel->backlight.max - val + panel->backlight.min;
 528         }
 529
 530         return val;
 531 }
 532
 533 static u32 lpt_get_backlight(struct intel_connector *connector)
 534 {
 535         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 536
 537         return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 538 }
 539
 540 static u32 pch_get_backlight(struct intel_connector *connector)
 541 {
 542         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 543
 544         return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 545 }
 546
 547 static u32 i9xx_get_backlight(struct intel_connector *connector)
 548 {
 549         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 550         struct intel_panel *panel = &connector->panel;
 551         u32 val;
 552
 553         val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 554         if (INTEL_GEN(dev_priv) < 4)
 555                 val >>= 1;
 556
 557         if (panel->backlight.combination_mode) {
 558                 u8 lbpc;
 559
 560                 pci_read_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, &lbpc);
 561                 val *= lbpc;
 562         }
 563
 564         return val;
 565 }
 566
 567 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
 568 {
 569         if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
 570                 return 0;
 571
 572         return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 573 }
 574
 575 static u32 vlv_get_backlight(struct intel_connector *connector)
 576 {
 577         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 578         enum pipe pipe = intel_connector_get_pipe(connector);
 579
 580         return _vlv_get_backlight(dev_priv, pipe);
 581 }
 582
 583 static u32 bxt_get_backlight(struct intel_connector *connector)
 584 {
 585         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 586         struct intel_panel *panel = &connector->panel;
 587
 588         return intel_de_read(dev_priv,
 589                              BXT_BLC_PWM_DUTY(panel->backlight.controller));
 590 }
 591
 592 static u32 ext_pwm_get_backlight(struct intel_connector *connector)
 593 {
 594         struct intel_panel *panel = &connector->panel;
 595         struct pwm_state state;
 596
 597         pwm_get_state(panel->backlight.pwm, &state);
 598         return pwm_get_relative_duty_cycle(&state, 100);
 599 }
 600
 601 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 602 {
 603         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 604         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 605
 606         u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 607         intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
 608 }
 609
 610 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 611 {
 612         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 613         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 614         u32 tmp;
 615
 616         tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 617         intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
 618 }
 619
 620 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 621 {
 622         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 623         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 624         struct intel_panel *panel = &connector->panel;
 625         u32 tmp, mask;
 626
 627         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
 628
 629         if (panel->backlight.combination_mode) {
 630                 u8 lbpc;
 631
 632                 lbpc = level * 0xfe / panel->backlight.max + 1;
 633                 level /= lbpc;
 634                 pci_write_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, lbpc);
 635         }
 636
 637         if (IS_GEN(dev_priv, 4)) {
 638                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 639         } else {
 640                 level <<= 1;
 641                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 642         }
 643
 644         tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
 645         intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
 646 }
 647
 648 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 649 {
 650         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 651         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 652         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 653         u32 tmp;
 654
 655         tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 656         intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
 657 }
 658
 659 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 660 {
 661         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 662         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 663         struct intel_panel *panel = &connector->panel;
 664
 665         intel_de_write(dev_priv,
 666                        BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 667 }
 668
 669 static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 670 {
 671         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 672
 673         pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
 674         pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
 675 }
 676
 677 static void
 678 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 679 {
 680         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 681         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 682         struct intel_panel *panel = &connector->panel;
 683
 684         drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", level);
 685
 686         level = intel_panel_compute_brightness(connector, level);
 687         panel->backlight.funcs->set(conn_state, level);
 688 }
 689
 690 /* set backlight brightness to level in range [0..max], assuming hw min is
 691  * respected.
 692  */
 693 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 694                                     u32 user_level, u32 user_max)
 695 {
 696         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 697         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 698         struct intel_panel *panel = &connector->panel;
 699         u32 hw_level;
 700
 701         /*
 702          * Lack of crtc may occur during driver init because
 703          * connection_mutex isn't held across the entire backlight
 704          * setup + modeset readout, and the BIOS can issue the
 705          * requests at any time.
 706          */
 707         if (!panel->backlight.present || !conn_state->crtc)
 708                 return;
 709
 710         mutex_lock(&dev_priv->backlight_lock);
 711
 712         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
 713
 714         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 715         panel->backlight.level = hw_level;
 716
 717         if (panel->backlight.device)
 718                 panel->backlight.device->props.brightness =
 719                         scale_hw_to_user(connector,
 720                                          panel->backlight.level,
 721                                          panel->backlight.device->props.max_brightness);
 722
 723         if (panel->backlight.enabled)
 724                 intel_panel_actually_set_backlight(conn_state, hw_level);
 725
 726         mutex_unlock(&dev_priv->backlight_lock);
 727 }
 728
 729 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
 730 {
 731         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 732         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 733         u32 tmp;
 734
 735         intel_panel_actually_set_backlight(old_conn_state, level);
 736
 737         /*
 738          * Although we don't support or enable CPU PWM with LPT/SPT based
 739          * systems, it may have been enabled prior to loading the
 740          * driver. Disable to avoid warnings on LCPLL disable.
 741          *
 742          * This needs rework if we need to add support for CPU PWM on PCH split
 743          * platforms.
 744          */
 745         tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
 746         if (tmp & BLM_PWM_ENABLE) {
 747                 drm_dbg_kms(&dev_priv->drm,
 748                             "cpu backlight was enabled, disabling\n");
 749                 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
 750                                tmp & ~BLM_PWM_ENABLE);
 751         }
 752
 753         tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 754         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 755 }
 756
 757 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 758 {
 759         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 760         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 761         u32 tmp;
 762
 763         intel_panel_actually_set_backlight(old_conn_state, val);
 764
 765         tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
 766         intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 767
 768         tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 769         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 770 }
 771
 772 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 773 {
 774         intel_panel_actually_set_backlight(old_conn_state, val);
 775 }
 776
 777 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 778 {
 779         struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 780         u32 tmp;
 781
 782         intel_panel_actually_set_backlight(old_conn_state, val);
 783
 784         tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
 785         intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 786 }
 787
 788 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 789 {
 790         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 791         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 792         enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 793         u32 tmp;
 794
 795         intel_panel_actually_set_backlight(old_conn_state, val);
 796
 797         tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
 798         intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
 799                        tmp & ~BLM_PWM_ENABLE);
 800 }
 801
 802 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 803 {
 804         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 805         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 806         struct intel_panel *panel = &connector->panel;
 807         u32 tmp;
 808
 809         intel_panel_actually_set_backlight(old_conn_state, val);
 810
 811         tmp = intel_de_read(dev_priv,
 812                             BXT_BLC_PWM_CTL(panel->backlight.controller));
 813         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
 814                        tmp & ~BXT_BLC_PWM_ENABLE);
 815
 816         if (panel->backlight.controller == 1) {
 817                 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
 818                 val &= ~UTIL_PIN_ENABLE;
 819                 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
 820         }
 821 }
 822
 823 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 824 {
 825         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 826         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 827         struct intel_panel *panel = &connector->panel;
 828         u32 tmp;
 829
 830         intel_panel_actually_set_backlight(old_conn_state, val);
 831
 832         tmp = intel_de_read(dev_priv,
 833                             BXT_BLC_PWM_CTL(panel->backlight.controller));
 834         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
 835                        tmp & ~BXT_BLC_PWM_ENABLE);
 836 }
 837
 838 static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
 839 {
 840         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 841         struct intel_panel *panel = &connector->panel;
 842
 843         panel->backlight.pwm_state.enabled = false;
 844         pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
 845 }
 846
 847 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
 848 {
 849         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 850         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 851         struct intel_panel *panel = &connector->panel;
 852
 853         if (!panel->backlight.present)
 854                 return;
 855
 856         /*
 857          * Do not disable backlight on the vga_switcheroo path. When switching
 858          * away from i915, the other client may depend on i915 to handle the
 859          * backlight. This will leave the backlight on unnecessarily when
 860          * another client is not activated.
 861          */
 862         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 863                 drm_dbg_kms(&dev_priv->drm,
 864                             "Skipping backlight disable on vga switch\n");
 865                 return;
 866         }
 867
 868         mutex_lock(&dev_priv->backlight_lock);
 869
 870         if (panel->backlight.device)
 871                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 872         panel->backlight.enabled = false;
 873         panel->backlight.funcs->disable(old_conn_state, 0);
 874
 875         mutex_unlock(&dev_priv->backlight_lock);
 876 }
 877
 878 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 879                                  const struct drm_connector_state *conn_state, u32 level)
 880 {
 881         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 882         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 883         struct intel_panel *panel = &connector->panel;
 884         u32 pch_ctl1, pch_ctl2, schicken;
 885
 886         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 887         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 888                 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
 889                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 890                 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
 891         }
 892
 893         if (HAS_PCH_LPT(dev_priv)) {
 894                 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
 895                 if (panel->backlight.alternate_pwm_increment)
 896                         schicken |= LPT_PWM_GRANULARITY;
 897                 else
 898                         schicken &= ~LPT_PWM_GRANULARITY;
 899                 intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
 900         } else {
 901                 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
 902                 if (panel->backlight.alternate_pwm_increment)
 903                         schicken |= SPT_PWM_GRANULARITY;
 904                 else
 905                         schicken &= ~SPT_PWM_GRANULARITY;
 906                 intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
 907         }
 908
 909         pch_ctl2 = panel->backlight.max << 16;
 910         intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
 911
 912         pch_ctl1 = 0;
 913         if (panel->backlight.active_low_pwm)
 914                 pch_ctl1 |= BLM_PCH_POLARITY;
 915
 916         /* After LPT, override is the default. */
 917         if (HAS_PCH_LPT(dev_priv))
 918                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 919
 920         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
 921         intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
 922         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
 923                        pch_ctl1 | BLM_PCH_PWM_ENABLE);
 924
 925         /* This won't stick until the above enable. */
 926         intel_panel_actually_set_backlight(conn_state, level);
 927 }
 928
 929 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 930                                  const struct drm_connector_state *conn_state, u32 level)
 931 {
 932         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 933         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 934         struct intel_panel *panel = &connector->panel;
 935         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 936         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 937
 938         cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
 939         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 940                 drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
 941                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 942                 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
 943         }
 944
 945         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
 946         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 947                 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
 948                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 949                 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
 950         }
 951
 952         if (cpu_transcoder == TRANSCODER_EDP)
 953                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 954         else
 955                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 956         intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
 957         intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
 958         intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 959
 960         /* This won't stick until the above enable. */
 961         intel_panel_actually_set_backlight(conn_state, level);
 962
 963         pch_ctl2 = panel->backlight.max << 16;
 964         intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
 965
 966         pch_ctl1 = 0;
 967         if (panel->backlight.active_low_pwm)
 968                 pch_ctl1 |= BLM_PCH_POLARITY;
 969
 970         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
 971         intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
 972         intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
 973                        pch_ctl1 | BLM_PCH_PWM_ENABLE);
 974 }
 975
 976 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
 977                                   const struct drm_connector_state *conn_state, u32 level)
 978 {
 979         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 980         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 981         struct intel_panel *panel = &connector->panel;
 982         u32 ctl, freq;
 983
 984         ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
 985         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 986                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
 987                 intel_de_write(dev_priv, BLC_PWM_CTL, 0);
 988         }
 989
 990         freq = panel->backlight.max;
 991         if (panel->backlight.combination_mode)
 992                 freq /= 0xff;
 993
 994         ctl = freq << 17;
 995         if (panel->backlight.combination_mode)
 996                 ctl |= BLM_LEGACY_MODE;
 997         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
 998                 ctl |= BLM_POLARITY_PNV;
 999
1000         intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1001         intel_de_posting_read(dev_priv, BLC_PWM_CTL);
1002
1003         /* XXX: combine this into above write? */
1004         intel_panel_actually_set_backlight(conn_state, level);
1005
1006         /*
1007          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
1008          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
1009          * that has backlight.
1010          */
1011         if (IS_GEN(dev_priv, 2))
1012                 intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
1013 }
1014
1015 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
1016                                   const struct drm_connector_state *conn_state, u32 level)
1017 {
1018         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1019         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1020         struct intel_panel *panel = &connector->panel;
1021         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1022         u32 ctl, ctl2, freq;
1023
1024         ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1025         if (ctl2 & BLM_PWM_ENABLE) {
1026                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1027                 ctl2 &= ~BLM_PWM_ENABLE;
1028                 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1029         }
1030
1031         freq = panel->backlight.max;
1032         if (panel->backlight.combination_mode)
1033                 freq /= 0xff;
1034
1035         ctl = freq << 16;
1036         intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1037
1038         ctl2 = BLM_PIPE(pipe);
1039         if (panel->backlight.combination_mode)
1040                 ctl2 |= BLM_COMBINATION_MODE;
1041         if (panel->backlight.active_low_pwm)
1042                 ctl2 |= BLM_POLARITY_I965;
1043         intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1044         intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
1045         intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1046
1047         intel_panel_actually_set_backlight(conn_state, level);
1048 }
1049
1050 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1051                                  const struct drm_connector_state *conn_state, u32 level)
1052 {
1053         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1054         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1055         struct intel_panel *panel = &connector->panel;
1056         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1057         u32 ctl, ctl2;
1058
1059         ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1060         if (ctl2 & BLM_PWM_ENABLE) {
1061                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1062                 ctl2 &= ~BLM_PWM_ENABLE;
1063                 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1064         }
1065
1066         ctl = panel->backlight.max << 16;
1067         intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
1068
1069         /* XXX: combine this into above write? */
1070         intel_panel_actually_set_backlight(conn_state, level);
1071
1072         ctl2 = 0;
1073         if (panel->backlight.active_low_pwm)
1074                 ctl2 |= BLM_POLARITY_I965;
1075         intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1076         intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1077         intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
1078                        ctl2 | BLM_PWM_ENABLE);
1079 }
1080
1081 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1082                                  const struct drm_connector_state *conn_state, u32 level)
1083 {
1084         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1085         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1086         struct intel_panel *panel = &connector->panel;
1087         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1088         u32 pwm_ctl, val;
1089
1090         /* Controller 1 uses the utility pin. */
1091         if (panel->backlight.controller == 1) {
1092                 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1093                 if (val & UTIL_PIN_ENABLE) {
1094                         drm_dbg_kms(&dev_priv->drm,
1095                                     "util pin already enabled\n");
1096                         val &= ~UTIL_PIN_ENABLE;
1097                         intel_de_write(dev_priv, UTIL_PIN_CTL, val);
1098                 }
1099
1100                 val = 0;
1101                 if (panel->backlight.util_pin_active_low)
1102                         val |= UTIL_PIN_POLARITY;
1103                 intel_de_write(dev_priv, UTIL_PIN_CTL,
1104                                val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1105         }
1106
1107         pwm_ctl = intel_de_read(dev_priv,
1108                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1109         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1110                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1111                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1112                 intel_de_write(dev_priv,
1113                                BXT_BLC_PWM_CTL(panel->backlight.controller),
1114                                pwm_ctl);
1115         }
1116
1117         intel_de_write(dev_priv,
1118                        BXT_BLC_PWM_FREQ(panel->backlight.controller),
1119                        panel->backlight.max);
1120
1121         intel_panel_actually_set_backlight(conn_state, level);
1122
1123         pwm_ctl = 0;
1124         if (panel->backlight.active_low_pwm)
1125                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1126
1127         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1128                        pwm_ctl);
1129         intel_de_posting_read(dev_priv,
1130                               BXT_BLC_PWM_CTL(panel->backlight.controller));
1131         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1132                        pwm_ctl | BXT_BLC_PWM_ENABLE);
1133 }
1134
1135 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1136                                  const struct drm_connector_state *conn_state, u32 level)
1137 {
1138         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1139         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1140         struct intel_panel *panel = &connector->panel;
1141         u32 pwm_ctl;
1142
1143         pwm_ctl = intel_de_read(dev_priv,
1144                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1145         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1146                 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1147                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1148                 intel_de_write(dev_priv,
1149                                BXT_BLC_PWM_CTL(panel->backlight.controller),
1150                                pwm_ctl);
1151         }
1152
1153         intel_de_write(dev_priv,
1154                        BXT_BLC_PWM_FREQ(panel->backlight.controller),
1155                        panel->backlight.max);
1156
1157         intel_panel_actually_set_backlight(conn_state, level);
1158
1159         pwm_ctl = 0;
1160         if (panel->backlight.active_low_pwm)
1161                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1162
1163         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1164                        pwm_ctl);
1165         intel_de_posting_read(dev_priv,
1166                               BXT_BLC_PWM_CTL(panel->backlight.controller));
1167         intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1168                        pwm_ctl | BXT_BLC_PWM_ENABLE);
1169 }
1170
1171 static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1172                                      const struct drm_connector_state *conn_state, u32 level)
1173 {
1174         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1175         struct intel_panel *panel = &connector->panel;
1176
1177         level = intel_panel_compute_brightness(connector, level);
1178         pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
1179         panel->backlight.pwm_state.enabled = true;
1180         pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1181 }
1182
1183 static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1184                                            const struct drm_connector_state *conn_state)
1185 {
1186         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1187         struct intel_panel *panel = &connector->panel;
1188
1189         WARN_ON(panel->backlight.max == 0);
1190
1191         if (panel->backlight.level <= panel->backlight.min) {
1192                 panel->backlight.level = panel->backlight.max;
1193                 if (panel->backlight.device)
1194                         panel->backlight.device->props.brightness =
1195                                 scale_hw_to_user(connector,
1196                                                  panel->backlight.level,
1197                                                  panel->backlight.device->props.max_brightness);
1198         }
1199
1200         panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
1201         panel->backlight.enabled = true;
1202         if (panel->backlight.device)
1203                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1204 }
1205
1206 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1207                                   const struct drm_connector_state *conn_state)
1208 {
1209         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1210         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1211         struct intel_panel *panel = &connector->panel;
1212         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1213
1214         if (!panel->backlight.present)
1215                 return;
1216
1217         drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
1218
1219         mutex_lock(&dev_priv->backlight_lock);
1220
1221         __intel_panel_enable_backlight(crtc_state, conn_state);
1222
1223         mutex_unlock(&dev_priv->backlight_lock);
1224 }
1225
1226 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1227 static u32 intel_panel_get_backlight(struct intel_connector *connector)
1228 {
1229         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1230         struct intel_panel *panel = &connector->panel;
1231         u32 val = 0;
1232
1233         mutex_lock(&dev_priv->backlight_lock);
1234
1235         if (panel->backlight.enabled) {
1236                 val = panel->backlight.funcs->get(connector);
1237                 val = intel_panel_compute_brightness(connector, val);
1238         }
1239
1240         mutex_unlock(&dev_priv->backlight_lock);
1241
1242         drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
1243         return val;
1244 }
1245
1246 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
1247 static u32 scale_user_to_hw(struct intel_connector *connector,
1248                             u32 user_level, u32 user_max)
1249 {
1250         struct intel_panel *panel = &connector->panel;
1251
1252         return scale(user_level, 0, user_max,
1253                      panel->backlight.min, panel->backlight.max);
1254 }
1255
1256 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
1257 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1258                                       u32 user_level, u32 user_max)
1259 {
1260         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1261         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1262         struct intel_panel *panel = &connector->panel;
1263         u32 hw_level;
1264
1265         if (!panel->backlight.present)
1266                 return;
1267
1268         mutex_lock(&dev_priv->backlight_lock);
1269
1270         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1271
1272         hw_level = scale_user_to_hw(connector, user_level, user_max);
1273         panel->backlight.level = hw_level;
1274
1275         if (panel->backlight.enabled)
1276                 intel_panel_actually_set_backlight(conn_state, hw_level);
1277
1278         mutex_unlock(&dev_priv->backlight_lock);
1279 }
1280
1281 static int intel_backlight_device_update_status(struct backlight_device *bd)
1282 {
1283         struct intel_connector *connector = bl_get_data(bd);
1284         struct intel_panel *panel = &connector->panel;
1285         struct drm_device *dev = connector->base.dev;
1286
1287         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1288         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1289                       bd->props.brightness, bd->props.max_brightness);
1290         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1291                                   bd->props.max_brightness);
1292
1293         /*
1294          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1295          * backlight class device does not make it easy to to differentiate
1296          * between callbacks for brightness and bl_power, so our backlight_power
1297          * callback needs to take this into account.
1298          */
1299         if (panel->backlight.enabled) {
1300                 if (panel->backlight.power) {
1301                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1302                                 bd->props.brightness != 0;
1303                         panel->backlight.power(connector, enable);
1304                 }
1305         } else {
1306                 bd->props.power = FB_BLANK_POWERDOWN;
1307         }
1308
1309         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1310         return 0;
1311 }
1312
1313 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1314 {
1315         struct intel_connector *connector = bl_get_data(bd);
1316         struct drm_device *dev = connector->base.dev;
1317         struct drm_i915_private *dev_priv = to_i915(dev);
1318         intel_wakeref_t wakeref;
1319         int ret = 0;
1320
1321         with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
1322                 u32 hw_level;
1323
1324                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1325
1326                 hw_level = intel_panel_get_backlight(connector);
1327                 ret = scale_hw_to_user(connector,
1328                                        hw_level, bd->props.max_brightness);
1329
1330                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1331         }
1332
1333         return ret;
1334 }
1335
1336 static const struct backlight_ops intel_backlight_device_ops = {
1337         .update_status = intel_backlight_device_update_status,
1338         .get_brightness = intel_backlight_device_get_brightness,
1339 };
1340
1341 int intel_backlight_device_register(struct intel_connector *connector)
1342 {
1343         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1344         struct intel_panel *panel = &connector->panel;
1345         struct backlight_properties props;
1346
1347         if (WARN_ON(panel->backlight.device))
1348                 return -ENODEV;
1349
1350         if (!panel->backlight.present)
1351                 return 0;
1352
1353         WARN_ON(panel->backlight.max == 0);
1354
1355         memset(&props, 0, sizeof(props));
1356         props.type = BACKLIGHT_RAW;
1357
1358         /*
1359          * Note: Everything should work even if the backlight device max
1360          * presented to the userspace is arbitrarily chosen.
1361          */
1362         props.max_brightness = panel->backlight.max;
1363         props.brightness = scale_hw_to_user(connector,
1364                                             panel->backlight.level,
1365                                             props.max_brightness);
1366
1367         if (panel->backlight.enabled)
1368                 props.power = FB_BLANK_UNBLANK;
1369         else
1370                 props.power = FB_BLANK_POWERDOWN;
1371
1372         /*
1373          * Note: using the same name independent of the connector prevents
1374          * registration of multiple backlight devices in the driver.
1375          */
1376         panel->backlight.device =
1377                 backlight_device_register("intel_backlight",
1378                                           connector->base.kdev,
1379                                           connector,
1380                                           &intel_backlight_device_ops, &props);
1381
1382         if (IS_ERR(panel->backlight.device)) {
1383                 drm_err(&i915->drm, "Failed to register backlight: %ld\n",
1384                         PTR_ERR(panel->backlight.device));
1385                 panel->backlight.device = NULL;
1386                 return -ENODEV;
1387         }
1388
1389         drm_dbg_kms(&i915->drm,
1390                     "Connector %s backlight sysfs interface registered\n",
1391                     connector->base.name);
1392
1393         return 0;
1394 }
1395
1396 void intel_backlight_device_unregister(struct intel_connector *connector)
1397 {
1398         struct intel_panel *panel = &connector->panel;
1399
1400         if (panel->backlight.device) {
1401                 backlight_device_unregister(panel->backlight.device);
1402                 panel->backlight.device = NULL;
1403         }
1404 }
1405 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1406
1407 /*
1408  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1409  *      PWM increment = 1
1410  */
1411 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1412 {
1413         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1414
1415         return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1416                                  pwm_freq_hz);
1417 }
1418
1419 /*
1420  * BXT: PWM clock frequency = 19.2 MHz.
1421  */
1422 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1423 {
1424         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1425 }
1426
1427 /*
1428  * SPT: This value represents the period of the PWM stream in clock periods
1429  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1430  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1431  */
1432 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1433 {
1434         struct intel_panel *panel = &connector->panel;
1435         u32 mul;
1436
1437         if (panel->backlight.alternate_pwm_increment)
1438                 mul = 128;
1439         else
1440                 mul = 16;
1441
1442         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1443 }
1444
1445 /*
1446  * LPT: This value represents the period of the PWM stream in clock periods
1447  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1448  * LPT SOUTH_CHICKEN2 register bit 5).
1449  */
1450 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1451 {
1452         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1453         struct intel_panel *panel = &connector->panel;
1454         u32 mul, clock;
1455
1456         if (panel->backlight.alternate_pwm_increment)
1457                 mul = 16;
1458         else
1459                 mul = 128;
1460
1461         if (HAS_PCH_LPT_H(dev_priv))
1462                 clock = MHz(135); /* LPT:H */
1463         else
1464                 clock = MHz(24); /* LPT:LP */
1465
1466         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1467 }
1468
1469 /*
1470  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1471  * display raw clocks multiplied by 128.
1472  */
1473 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1474 {
1475         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1476
1477         return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1478                                  pwm_freq_hz * 128);
1479 }
1480
1481 /*
1482  * Gen2: This field determines the number of time base events (display core
1483  * clock frequency/32) in total for a complete cycle of modulated backlight
1484  * control.
1485  *
1486  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1487  * divided by 32.
1488  */
1489 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1490 {
1491         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1492         int clock;
1493
1494         if (IS_PINEVIEW(dev_priv))
1495                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1496         else
1497                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1498
1499         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1500 }
1501
1502 /*
1503  * Gen4: This value represents the period of the PWM stream in display core
1504  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1505  *
1506  */
1507 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1508 {
1509         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1510         int clock;
1511
1512         if (IS_G4X(dev_priv))
1513                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1514         else
1515                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1516
1517         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1518 }
1519
1520 /*
1521  * VLV: This value represents the period of the PWM stream in display core
1522  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1523  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1524  */
1525 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1526 {
1527         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1528         int mul, clock;
1529
1530         if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1531                 if (IS_CHERRYVIEW(dev_priv))
1532                         clock = KHz(19200);
1533                 else
1534                         clock = MHz(25);
1535                 mul = 16;
1536         } else {
1537                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1538                 mul = 128;
1539         }
1540
1541         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1542 }
1543
1544 static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
1545 {
1546         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1547
1548         if (pwm_freq_hz) {
1549                 drm_dbg_kms(&dev_priv->drm,
1550                             "VBT defined backlight frequency %u Hz\n",
1551                             pwm_freq_hz);
1552         } else {
1553                 pwm_freq_hz = 200;
1554                 drm_dbg_kms(&dev_priv->drm,
1555                             "default backlight frequency %u Hz\n",
1556                             pwm_freq_hz);
1557         }
1558
1559         return pwm_freq_hz;
1560 }
1561
1562 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1563 {
1564         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1565         struct intel_panel *panel = &connector->panel;
1566         u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
1567         u32 pwm;
1568
1569         if (!panel->backlight.funcs->hz_to_pwm) {
1570                 drm_dbg_kms(&dev_priv->drm,
1571                             "backlight frequency conversion not supported\n");
1572                 return 0;
1573         }
1574
1575         pwm = panel->backlight.funcs->hz_to_pwm(connector, pwm_freq_hz);
1576         if (!pwm) {
1577                 drm_dbg_kms(&dev_priv->drm,
1578                             "backlight frequency conversion failed\n");
1579                 return 0;
1580         }
1581
1582         return pwm;
1583 }
1584
1585 /*
1586  * Note: The setup hooks can't assume pipe is set!
1587  */
1588 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1589 {
1590         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1591         struct intel_panel *panel = &connector->panel;
1592         int min;
1593
1594         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1595
1596         /*
1597          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1598          * to problems. There are such machines out there. Either our
1599          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1600          * against this by letting the minimum be at most (arbitrarily chosen)
1601          * 25% of the max.
1602          */
1603         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1604         if (min != dev_priv->vbt.backlight.min_brightness) {
1605                 drm_dbg_kms(&dev_priv->drm,
1606                             "clamping VBT min backlight %d/255 to %d/255\n",
1607                             dev_priv->vbt.backlight.min_brightness, min);
1608         }
1609
1610         /* vbt value is a coefficient in range [0..255] */
1611         return scale(min, 0, 255, 0, panel->backlight.max);
1612 }
1613
1614 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1615 {
1616         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1617         struct intel_panel *panel = &connector->panel;
1618         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1619         bool alt, cpu_mode;
1620
1621         if (HAS_PCH_LPT(dev_priv))
1622                 alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1623         else
1624                 alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1625         panel->backlight.alternate_pwm_increment = alt;
1626
1627         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1628         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1629
1630         pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1631         panel->backlight.max = pch_ctl2 >> 16;
1632
1633         cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1634
1635         if (!panel->backlight.max)
1636                 panel->backlight.max = get_backlight_max_vbt(connector);
1637
1638         if (!panel->backlight.max)
1639                 return -ENODEV;
1640
1641         panel->backlight.min = get_backlight_min_vbt(connector);
1642
1643         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1644
1645         cpu_mode = panel->backlight.enabled && HAS_PCH_LPT(dev_priv) &&
1646                    !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1647                    (cpu_ctl2 & BLM_PWM_ENABLE);
1648         if (cpu_mode)
1649                 val = pch_get_backlight(connector);
1650         else
1651                 val = lpt_get_backlight(connector);
1652
1653         if (cpu_mode) {
1654                 drm_dbg_kms(&dev_priv->drm,
1655                             "CPU backlight register was enabled, switching to PCH override\n");
1656
1657                 /* Write converted CPU PWM value to PCH override register */
1658                 lpt_set_backlight(connector->base.state, val);
1659                 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1660                                pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1661
1662                 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
1663                                cpu_ctl2 & ~BLM_PWM_ENABLE);
1664         }
1665
1666         val = intel_panel_compute_brightness(connector, val);
1667         panel->backlight.level = clamp(val, panel->backlight.min,
1668                                        panel->backlight.max);
1669
1670         return 0;
1671 }
1672
1673 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1674 {
1675         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1676         struct intel_panel *panel = &connector->panel;
1677         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1678
1679         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1680         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1681
1682         pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1683         panel->backlight.max = pch_ctl2 >> 16;
1684
1685         if (!panel->backlight.max)
1686                 panel->backlight.max = get_backlight_max_vbt(connector);
1687
1688         if (!panel->backlight.max)
1689                 return -ENODEV;
1690
1691         panel->backlight.min = get_backlight_min_vbt(connector);
1692
1693         val = pch_get_backlight(connector);
1694         val = intel_panel_compute_brightness(connector, val);
1695         panel->backlight.level = clamp(val, panel->backlight.min,
1696                                        panel->backlight.max);
1697
1698         cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1699         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1700                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1701
1702         return 0;
1703 }
1704
1705 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1706 {
1707         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1708         struct intel_panel *panel = &connector->panel;
1709         u32 ctl, val;
1710
1711         ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1712
1713         if (IS_GEN(dev_priv, 2) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1714                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1715
1716         if (IS_PINEVIEW(dev_priv))
1717                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1718
1719         panel->backlight.max = ctl >> 17;
1720
1721         if (!panel->backlight.max) {
1722                 panel->backlight.max = get_backlight_max_vbt(connector);
1723                 panel->backlight.max >>= 1;
1724         }
1725
1726         if (!panel->backlight.max)
1727                 return -ENODEV;
1728
1729         if (panel->backlight.combination_mode)
1730                 panel->backlight.max *= 0xff;
1731
1732         panel->backlight.min = get_backlight_min_vbt(connector);
1733
1734         val = i9xx_get_backlight(connector);
1735         val = intel_panel_compute_brightness(connector, val);
1736         panel->backlight.level = clamp(val, panel->backlight.min,
1737                                        panel->backlight.max);
1738
1739         panel->backlight.enabled = val != 0;
1740
1741         return 0;
1742 }
1743
1744 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1745 {
1746         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1747         struct intel_panel *panel = &connector->panel;
1748         u32 ctl, ctl2, val;
1749
1750         ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1751         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1752         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1753
1754         ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1755         panel->backlight.max = ctl >> 16;
1756
1757         if (!panel->backlight.max)
1758                 panel->backlight.max = get_backlight_max_vbt(connector);
1759
1760         if (!panel->backlight.max)
1761                 return -ENODEV;
1762
1763         if (panel->backlight.combination_mode)
1764                 panel->backlight.max *= 0xff;
1765
1766         panel->backlight.min = get_backlight_min_vbt(connector);
1767
1768         val = i9xx_get_backlight(connector);
1769         val = intel_panel_compute_brightness(connector, val);
1770         panel->backlight.level = clamp(val, panel->backlight.min,
1771                                        panel->backlight.max);
1772
1773         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1774
1775         return 0;
1776 }
1777
1778 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1779 {
1780         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1781         struct intel_panel *panel = &connector->panel;
1782         u32 ctl, ctl2, val;
1783
1784         if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
1785                 return -ENODEV;
1786
1787         ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1788         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1789
1790         ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
1791         panel->backlight.max = ctl >> 16;
1792
1793         if (!panel->backlight.max)
1794                 panel->backlight.max = get_backlight_max_vbt(connector);
1795
1796         if (!panel->backlight.max)
1797                 return -ENODEV;
1798
1799         panel->backlight.min = get_backlight_min_vbt(connector);
1800
1801         val = _vlv_get_backlight(dev_priv, pipe);
1802         val = intel_panel_compute_brightness(connector, val);
1803         panel->backlight.level = clamp(val, panel->backlight.min,
1804                                        panel->backlight.max);
1805
1806         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1807
1808         return 0;
1809 }
1810
1811 static int
1812 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1813 {
1814         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1815         struct intel_panel *panel = &connector->panel;
1816         u32 pwm_ctl, val;
1817
1818         panel->backlight.controller = dev_priv->vbt.backlight.controller;
1819
1820         pwm_ctl = intel_de_read(dev_priv,
1821                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1822
1823         /* Controller 1 uses the utility pin. */
1824         if (panel->backlight.controller == 1) {
1825                 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1826                 panel->backlight.util_pin_active_low =
1827                                         val & UTIL_PIN_POLARITY;
1828         }
1829
1830         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1831         panel->backlight.max =
1832                 intel_de_read(dev_priv,
1833                               BXT_BLC_PWM_FREQ(panel->backlight.controller));
1834
1835         if (!panel->backlight.max)
1836                 panel->backlight.max = get_backlight_max_vbt(connector);
1837
1838         if (!panel->backlight.max)
1839                 return -ENODEV;
1840
1841         panel->backlight.min = get_backlight_min_vbt(connector);
1842
1843         val = bxt_get_backlight(connector);
1844         val = intel_panel_compute_brightness(connector, val);
1845         panel->backlight.level = clamp(val, panel->backlight.min,
1846                                        panel->backlight.max);
1847
1848         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1849
1850         return 0;
1851 }
1852
1853 static int
1854 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1855 {
1856         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1857         struct intel_panel *panel = &connector->panel;
1858         u32 pwm_ctl, val;
1859
1860         /*
1861          * CNP has the BXT implementation of backlight, but with only one
1862          * controller. TODO: ICP has multiple controllers but we only use
1863          * controller 0 for now.
1864          */
1865         panel->backlight.controller = 0;
1866
1867         pwm_ctl = intel_de_read(dev_priv,
1868                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1869
1870         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1871         panel->backlight.max =
1872                 intel_de_read(dev_priv,
1873                               BXT_BLC_PWM_FREQ(panel->backlight.controller));
1874
1875         if (!panel->backlight.max)
1876                 panel->backlight.max = get_backlight_max_vbt(connector);
1877
1878         if (!panel->backlight.max)
1879                 return -ENODEV;
1880
1881         panel->backlight.min = get_backlight_min_vbt(connector);
1882
1883         val = bxt_get_backlight(connector);
1884         val = intel_panel_compute_brightness(connector, val);
1885         panel->backlight.level = clamp(val, panel->backlight.min,
1886                                        panel->backlight.max);
1887
1888         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1889
1890         return 0;
1891 }
1892
1893 static int ext_pwm_setup_backlight(struct intel_connector *connector,
1894                                    enum pipe pipe)
1895 {
1896         struct drm_device *dev = connector->base.dev;
1897         struct drm_i915_private *dev_priv = to_i915(dev);
1898         struct intel_panel *panel = &connector->panel;
1899         const char *desc;
1900         u32 level;
1901
1902         /* Get the right PWM chip for DSI backlight according to VBT */
1903         if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1904                 panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
1905                 desc = "PMIC";
1906         } else {
1907                 panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
1908                 desc = "SoC";
1909         }
1910
1911         if (IS_ERR(panel->backlight.pwm)) {
1912                 drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n",
1913                         desc);
1914                 panel->backlight.pwm = NULL;
1915                 return -ENODEV;
1916         }
1917
1918         panel->backlight.max = 100; /* 100% */
1919         panel->backlight.min = get_backlight_min_vbt(connector);
1920
1921         if (pwm_is_enabled(panel->backlight.pwm)) {
1922                 /* PWM is already enabled, use existing settings */
1923                 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1924
1925                 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
1926                                                     100);
1927                 level = intel_panel_compute_brightness(connector, level);
1928                 panel->backlight.level = clamp(level, panel->backlight.min,
1929                                                panel->backlight.max);
1930                 panel->backlight.enabled = true;
1931
1932                 drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
1933                             NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
1934                             get_vbt_pwm_freq(dev_priv), level);
1935         } else {
1936                 /* Set period from VBT frequency, leave other settings at 0. */
1937                 panel->backlight.pwm_state.period =
1938                         NSEC_PER_SEC / get_vbt_pwm_freq(dev_priv);
1939         }
1940
1941         drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
1942                  desc);
1943         return 0;
1944 }
1945
1946 void intel_panel_update_backlight(struct intel_atomic_state *state,
1947                                   struct intel_encoder *encoder,
1948                                   const struct intel_crtc_state *crtc_state,
1949                                   const struct drm_connector_state *conn_state)
1950 {
1951         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1952         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1953         struct intel_panel *panel = &connector->panel;
1954
1955         if (!panel->backlight.present)
1956                 return;
1957
1958         mutex_lock(&dev_priv->backlight_lock);
1959         if (!panel->backlight.enabled)
1960                 __intel_panel_enable_backlight(crtc_state, conn_state);
1961
1962         mutex_unlock(&dev_priv->backlight_lock);
1963 }
1964
1965 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1966 {
1967         struct drm_i915_private *dev_priv = to_i915(connector->dev);
1968         struct intel_connector *intel_connector = to_intel_connector(connector);
1969         struct intel_panel *panel = &intel_connector->panel;
1970         int ret;
1971
1972         if (!dev_priv->vbt.backlight.present) {
1973                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1974                         drm_dbg_kms(&dev_priv->drm,
1975                                     "no backlight present per VBT, but present per quirk\n");
1976                 } else {
1977                         drm_dbg_kms(&dev_priv->drm,
1978                                     "no backlight present per VBT\n");
1979                         return 0;
1980                 }
1981         }
1982
1983         /* ensure intel_panel has been initialized first */
1984         if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.funcs))
1985                 return -ENODEV;
1986
1987         /* set level and max in panel struct */
1988         mutex_lock(&dev_priv->backlight_lock);
1989         ret = panel->backlight.funcs->setup(intel_connector, pipe);
1990         mutex_unlock(&dev_priv->backlight_lock);
1991
1992         if (ret) {
1993                 drm_dbg_kms(&dev_priv->drm,
1994                             "failed to setup backlight for connector %s\n",
1995                             connector->name);
1996                 return ret;
1997         }
1998
1999         panel->backlight.present = true;
2000
2001         drm_dbg_kms(&dev_priv->drm,
2002                     "Connector %s backlight initialized, %s, brightness %u/%u\n",
2003                     connector->name,
2004                     enableddisabled(panel->backlight.enabled),
2005                     panel->backlight.level, panel->backlight.max);
2006
2007         return 0;
2008 }
2009
2010 static void intel_panel_destroy_backlight(struct intel_panel *panel)
2011 {
2012         /* dispose of the pwm */
2013         if (panel->backlight.pwm)
2014                 pwm_put(panel->backlight.pwm);
2015
2016         panel->backlight.present = false;
2017 }
2018
2019 static const struct intel_panel_bl_funcs bxt_funcs = {
2020         .setup = bxt_setup_backlight,
2021         .enable = bxt_enable_backlight,
2022         .disable = bxt_disable_backlight,
2023         .set = bxt_set_backlight,
2024         .get = bxt_get_backlight,
2025         .hz_to_pwm = bxt_hz_to_pwm,
2026 };
2027
2028 static const struct intel_panel_bl_funcs cnp_funcs = {
2029         .setup = cnp_setup_backlight,
2030         .enable = cnp_enable_backlight,
2031         .disable = cnp_disable_backlight,
2032         .set = bxt_set_backlight,
2033         .get = bxt_get_backlight,
2034         .hz_to_pwm = cnp_hz_to_pwm,
2035 };
2036
2037 static const struct intel_panel_bl_funcs lpt_funcs = {
2038         .setup = lpt_setup_backlight,
2039         .enable = lpt_enable_backlight,
2040         .disable = lpt_disable_backlight,
2041         .set = lpt_set_backlight,
2042         .get = lpt_get_backlight,
2043         .hz_to_pwm = lpt_hz_to_pwm,
2044 };
2045
2046 static const struct intel_panel_bl_funcs spt_funcs = {
2047         .setup = lpt_setup_backlight,
2048         .enable = lpt_enable_backlight,
2049         .disable = lpt_disable_backlight,
2050         .set = lpt_set_backlight,
2051         .get = lpt_get_backlight,
2052         .hz_to_pwm = spt_hz_to_pwm,
2053 };
2054
2055 static const struct intel_panel_bl_funcs pch_funcs = {
2056         .setup = pch_setup_backlight,
2057         .enable = pch_enable_backlight,
2058         .disable = pch_disable_backlight,
2059         .set = pch_set_backlight,
2060         .get = pch_get_backlight,
2061         .hz_to_pwm = pch_hz_to_pwm,
2062 };
2063
2064 static const struct intel_panel_bl_funcs ext_pwm_funcs = {
2065         .setup = ext_pwm_setup_backlight,
2066         .enable = ext_pwm_enable_backlight,
2067         .disable = ext_pwm_disable_backlight,
2068         .set = ext_pwm_set_backlight,
2069         .get = ext_pwm_get_backlight,
2070 };
2071
2072 static const struct intel_panel_bl_funcs vlv_funcs = {
2073         .setup = vlv_setup_backlight,
2074         .enable = vlv_enable_backlight,
2075         .disable = vlv_disable_backlight,
2076         .set = vlv_set_backlight,
2077         .get = vlv_get_backlight,
2078         .hz_to_pwm = vlv_hz_to_pwm,
2079 };
2080
2081 static const struct intel_panel_bl_funcs i965_funcs = {
2082         .setup = i965_setup_backlight,
2083         .enable = i965_enable_backlight,
2084         .disable = i965_disable_backlight,
2085         .set = i9xx_set_backlight,
2086         .get = i9xx_get_backlight,
2087         .hz_to_pwm = i965_hz_to_pwm,
2088 };
2089
2090 static const struct intel_panel_bl_funcs i9xx_funcs = {
2091         .setup = i9xx_setup_backlight,
2092         .enable = i9xx_enable_backlight,
2093         .disable = i9xx_disable_backlight,
2094         .set = i9xx_set_backlight,
2095         .get = i9xx_get_backlight,
2096         .hz_to_pwm = i9xx_hz_to_pwm,
2097 };
2098
2099 /* Set up chip specific backlight functions */
2100 static void
2101 intel_panel_init_backlight_funcs(struct intel_panel *panel)
2102 {
2103         struct intel_connector *connector =
2104                 container_of(panel, struct intel_connector, panel);
2105         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
2106
2107         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
2108             intel_dp_aux_init_backlight_funcs(connector) == 0)
2109                 return;
2110
2111         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
2112             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
2113                 return;
2114
2115         if (IS_GEN9_LP(dev_priv)) {
2116                 panel->backlight.funcs = &bxt_funcs;
2117         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
2118                 panel->backlight.funcs = &cnp_funcs;
2119         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
2120                 if (HAS_PCH_LPT(dev_priv))
2121                         panel->backlight.funcs = &lpt_funcs;
2122                 else
2123                         panel->backlight.funcs = &spt_funcs;
2124         } else if (HAS_PCH_SPLIT(dev_priv)) {
2125                 panel->backlight.funcs = &pch_funcs;
2126         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
2127                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
2128                         panel->backlight.funcs = &ext_pwm_funcs;
2129                 } else {
2130                         panel->backlight.funcs = &vlv_funcs;
2131                 }
2132         } else if (IS_GEN(dev_priv, 4)) {
2133                 panel->backlight.funcs = &i965_funcs;
2134         } else {
2135                 panel->backlight.funcs = &i9xx_funcs;
2136         }
2137 }
2138
2139 enum drm_connector_status
2140 intel_panel_detect(struct drm_connector *connector, bool force)
2141 {
2142         struct drm_i915_private *i915 = to_i915(connector->dev);
2143
2144         if (!INTEL_DISPLAY_ENABLED(i915))
2145                 return connector_status_disconnected;
2146
2147         return connector_status_connected;
2148 }
2149
2150 int intel_panel_init(struct intel_panel *panel,
2151                      struct drm_display_mode *fixed_mode,
2152                      struct drm_display_mode *downclock_mode)
2153 {
2154         intel_panel_init_backlight_funcs(panel);
2155
2156         panel->fixed_mode = fixed_mode;
2157         panel->downclock_mode = downclock_mode;
2158
2159         return 0;
2160 }
2161
2162 void intel_panel_fini(struct intel_panel *panel)
2163 {
2164         struct intel_connector *intel_connector =
2165                 container_of(panel, struct intel_connector, panel);
2166
2167         intel_panel_destroy_backlight(panel);
2168
2169         if (panel->fixed_mode)
2170                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2171
2172         if (panel->downclock_mode)
2173                 drm_mode_destroy(intel_connector->base.dev,
2174                                 panel->downclock_mode);
2175 }