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(dev_priv->drm.pdev, 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 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(dev_priv->drm.pdev, 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 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.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)
 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, 0);
 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)
 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, 0);
 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)
 773 {
 774         intel_panel_actually_set_backlight(old_conn_state, 0);
 775 }
 776
 777 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
 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, 0);
 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)
 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, 0);
 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)
 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, val;
 808
 809         intel_panel_actually_set_backlight(old_conn_state, 0);
 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)
 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, 0);
 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 pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
 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.disable(old_conn_state);
 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)
 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, panel->backlight.level);
 927 }
 928
 929 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 930                                  const struct drm_connector_state *conn_state)
 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, panel->backlight.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)
 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, panel->backlight.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)
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, panel->backlight.level);
1048 }
1049
1050 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1051                                  const struct drm_connector_state *conn_state)
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, panel->backlight.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)
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, panel->backlight.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)
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, panel->backlight.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 pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1172                                  const struct drm_connector_state *conn_state)
1173 {
1174         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1175         struct intel_panel *panel = &connector->panel;
1176         int level = panel->backlight.level;
1177
1178         level = intel_panel_compute_brightness(connector, level);
1179         pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
1180         panel->backlight.pwm_state.enabled = true;
1181         pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1182 }
1183
1184 static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1185                                            const struct drm_connector_state *conn_state)
1186 {
1187         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1188         struct intel_panel *panel = &connector->panel;
1189
1190         WARN_ON(panel->backlight.max == 0);
1191
1192         if (panel->backlight.level <= panel->backlight.min) {
1193                 panel->backlight.level = panel->backlight.max;
1194                 if (panel->backlight.device)
1195                         panel->backlight.device->props.brightness =
1196                                 scale_hw_to_user(connector,
1197                                                  panel->backlight.level,
1198                                                  panel->backlight.device->props.max_brightness);
1199         }
1200
1201         panel->backlight.enable(crtc_state, conn_state);
1202         panel->backlight.enabled = true;
1203         if (panel->backlight.device)
1204                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1205 }
1206
1207 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1208                                   const struct drm_connector_state *conn_state)
1209 {
1210         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1211         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1212         struct intel_panel *panel = &connector->panel;
1213         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1214
1215         if (!panel->backlight.present)
1216                 return;
1217
1218         drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
1219
1220         mutex_lock(&dev_priv->backlight_lock);
1221
1222         __intel_panel_enable_backlight(crtc_state, conn_state);
1223
1224         mutex_unlock(&dev_priv->backlight_lock);
1225 }
1226
1227 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1228 static u32 intel_panel_get_backlight(struct intel_connector *connector)
1229 {
1230         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1231         struct intel_panel *panel = &connector->panel;
1232         u32 val = 0;
1233
1234         mutex_lock(&dev_priv->backlight_lock);
1235
1236         if (panel->backlight.enabled) {
1237                 val = panel->backlight.get(connector);
1238                 val = intel_panel_compute_brightness(connector, val);
1239         }
1240
1241         mutex_unlock(&dev_priv->backlight_lock);
1242
1243         drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
1244         return val;
1245 }
1246
1247 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
1248 static u32 scale_user_to_hw(struct intel_connector *connector,
1249                             u32 user_level, u32 user_max)
1250 {
1251         struct intel_panel *panel = &connector->panel;
1252
1253         return scale(user_level, 0, user_max,
1254                      panel->backlight.min, panel->backlight.max);
1255 }
1256
1257 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
1258 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1259                                       u32 user_level, u32 user_max)
1260 {
1261         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1262         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1263         struct intel_panel *panel = &connector->panel;
1264         u32 hw_level;
1265
1266         if (!panel->backlight.present)
1267                 return;
1268
1269         mutex_lock(&dev_priv->backlight_lock);
1270
1271         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1272
1273         hw_level = scale_user_to_hw(connector, user_level, user_max);
1274         panel->backlight.level = hw_level;
1275
1276         if (panel->backlight.enabled)
1277                 intel_panel_actually_set_backlight(conn_state, hw_level);
1278
1279         mutex_unlock(&dev_priv->backlight_lock);
1280 }
1281
1282 static int intel_backlight_device_update_status(struct backlight_device *bd)
1283 {
1284         struct intel_connector *connector = bl_get_data(bd);
1285         struct intel_panel *panel = &connector->panel;
1286         struct drm_device *dev = connector->base.dev;
1287
1288         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1289         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1290                       bd->props.brightness, bd->props.max_brightness);
1291         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1292                                   bd->props.max_brightness);
1293
1294         /*
1295          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1296          * backlight class device does not make it easy to to differentiate
1297          * between callbacks for brightness and bl_power, so our backlight_power
1298          * callback needs to take this into account.
1299          */
1300         if (panel->backlight.enabled) {
1301                 if (panel->backlight.power) {
1302                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1303                                 bd->props.brightness != 0;
1304                         panel->backlight.power(connector, enable);
1305                 }
1306         } else {
1307                 bd->props.power = FB_BLANK_POWERDOWN;
1308         }
1309
1310         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1311         return 0;
1312 }
1313
1314 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1315 {
1316         struct intel_connector *connector = bl_get_data(bd);
1317         struct drm_device *dev = connector->base.dev;
1318         struct drm_i915_private *dev_priv = to_i915(dev);
1319         intel_wakeref_t wakeref;
1320         int ret = 0;
1321
1322         with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
1323                 u32 hw_level;
1324
1325                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1326
1327                 hw_level = intel_panel_get_backlight(connector);
1328                 ret = scale_hw_to_user(connector,
1329                                        hw_level, bd->props.max_brightness);
1330
1331                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1332         }
1333
1334         return ret;
1335 }
1336
1337 static const struct backlight_ops intel_backlight_device_ops = {
1338         .update_status = intel_backlight_device_update_status,
1339         .get_brightness = intel_backlight_device_get_brightness,
1340 };
1341
1342 int intel_backlight_device_register(struct intel_connector *connector)
1343 {
1344         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1345         struct intel_panel *panel = &connector->panel;
1346         struct backlight_properties props;
1347
1348         if (WARN_ON(panel->backlight.device))
1349                 return -ENODEV;
1350
1351         if (!panel->backlight.present)
1352                 return 0;
1353
1354         WARN_ON(panel->backlight.max == 0);
1355
1356         memset(&props, 0, sizeof(props));
1357         props.type = BACKLIGHT_RAW;
1358
1359         /*
1360          * Note: Everything should work even if the backlight device max
1361          * presented to the userspace is arbitrarily chosen.
1362          */
1363         props.max_brightness = panel->backlight.max;
1364         props.brightness = scale_hw_to_user(connector,
1365                                             panel->backlight.level,
1366                                             props.max_brightness);
1367
1368         if (panel->backlight.enabled)
1369                 props.power = FB_BLANK_UNBLANK;
1370         else
1371                 props.power = FB_BLANK_POWERDOWN;
1372
1373         /*
1374          * Note: using the same name independent of the connector prevents
1375          * registration of multiple backlight devices in the driver.
1376          */
1377         panel->backlight.device =
1378                 backlight_device_register("intel_backlight",
1379                                           connector->base.kdev,
1380                                           connector,
1381                                           &intel_backlight_device_ops, &props);
1382
1383         if (IS_ERR(panel->backlight.device)) {
1384                 drm_err(&i915->drm, "Failed to register backlight: %ld\n",
1385                         PTR_ERR(panel->backlight.device));
1386                 panel->backlight.device = NULL;
1387                 return -ENODEV;
1388         }
1389
1390         drm_dbg_kms(&i915->drm,
1391                     "Connector %s backlight sysfs interface registered\n",
1392                     connector->base.name);
1393
1394         return 0;
1395 }
1396
1397 void intel_backlight_device_unregister(struct intel_connector *connector)
1398 {
1399         struct intel_panel *panel = &connector->panel;
1400
1401         if (panel->backlight.device) {
1402                 backlight_device_unregister(panel->backlight.device);
1403                 panel->backlight.device = NULL;
1404         }
1405 }
1406 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1407
1408 /*
1409  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1410  *      PWM increment = 1
1411  */
1412 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1413 {
1414         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1415
1416         return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1417                                  pwm_freq_hz);
1418 }
1419
1420 /*
1421  * BXT: PWM clock frequency = 19.2 MHz.
1422  */
1423 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1424 {
1425         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1426 }
1427
1428 /*
1429  * SPT: This value represents the period of the PWM stream in clock periods
1430  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1431  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1432  */
1433 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1434 {
1435         struct intel_panel *panel = &connector->panel;
1436         u32 mul;
1437
1438         if (panel->backlight.alternate_pwm_increment)
1439                 mul = 128;
1440         else
1441                 mul = 16;
1442
1443         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1444 }
1445
1446 /*
1447  * LPT: This value represents the period of the PWM stream in clock periods
1448  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1449  * LPT SOUTH_CHICKEN2 register bit 5).
1450  */
1451 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1452 {
1453         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1454         struct intel_panel *panel = &connector->panel;
1455         u32 mul, clock;
1456
1457         if (panel->backlight.alternate_pwm_increment)
1458                 mul = 16;
1459         else
1460                 mul = 128;
1461
1462         if (HAS_PCH_LPT_H(dev_priv))
1463                 clock = MHz(135); /* LPT:H */
1464         else
1465                 clock = MHz(24); /* LPT:LP */
1466
1467         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1468 }
1469
1470 /*
1471  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1472  * display raw clocks multiplied by 128.
1473  */
1474 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1475 {
1476         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1477
1478         return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1479                                  pwm_freq_hz * 128);
1480 }
1481
1482 /*
1483  * Gen2: This field determines the number of time base events (display core
1484  * clock frequency/32) in total for a complete cycle of modulated backlight
1485  * control.
1486  *
1487  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1488  * divided by 32.
1489  */
1490 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1491 {
1492         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1493         int clock;
1494
1495         if (IS_PINEVIEW(dev_priv))
1496                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1497         else
1498                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1499
1500         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1501 }
1502
1503 /*
1504  * Gen4: This value represents the period of the PWM stream in display core
1505  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1506  *
1507  */
1508 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1509 {
1510         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1511         int clock;
1512
1513         if (IS_G4X(dev_priv))
1514                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1515         else
1516                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1517
1518         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1519 }
1520
1521 /*
1522  * VLV: This value represents the period of the PWM stream in display core
1523  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1524  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1525  */
1526 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1527 {
1528         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1529         int mul, clock;
1530
1531         if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1532                 if (IS_CHERRYVIEW(dev_priv))
1533                         clock = KHz(19200);
1534                 else
1535                         clock = MHz(25);
1536                 mul = 16;
1537         } else {
1538                 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1539                 mul = 128;
1540         }
1541
1542         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1543 }
1544
1545 static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
1546 {
1547         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1548
1549         if (pwm_freq_hz) {
1550                 drm_dbg_kms(&dev_priv->drm,
1551                             "VBT defined backlight frequency %u Hz\n",
1552                             pwm_freq_hz);
1553         } else {
1554                 pwm_freq_hz = 200;
1555                 drm_dbg_kms(&dev_priv->drm,
1556                             "default backlight frequency %u Hz\n",
1557                             pwm_freq_hz);
1558         }
1559
1560         return pwm_freq_hz;
1561 }
1562
1563 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1564 {
1565         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1566         struct intel_panel *panel = &connector->panel;
1567         u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
1568         u32 pwm;
1569
1570         if (!panel->backlight.hz_to_pwm) {
1571                 drm_dbg_kms(&dev_priv->drm,
1572                             "backlight frequency conversion not supported\n");
1573                 return 0;
1574         }
1575
1576         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1577         if (!pwm) {
1578                 drm_dbg_kms(&dev_priv->drm,
1579                             "backlight frequency conversion failed\n");
1580                 return 0;
1581         }
1582
1583         return pwm;
1584 }
1585
1586 /*
1587  * Note: The setup hooks can't assume pipe is set!
1588  */
1589 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1590 {
1591         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1592         struct intel_panel *panel = &connector->panel;
1593         int min;
1594
1595         drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1596
1597         /*
1598          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1599          * to problems. There are such machines out there. Either our
1600          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1601          * against this by letting the minimum be at most (arbitrarily chosen)
1602          * 25% of the max.
1603          */
1604         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1605         if (min != dev_priv->vbt.backlight.min_brightness) {
1606                 drm_dbg_kms(&dev_priv->drm,
1607                             "clamping VBT min backlight %d/255 to %d/255\n",
1608                             dev_priv->vbt.backlight.min_brightness, min);
1609         }
1610
1611         /* vbt value is a coefficient in range [0..255] */
1612         return scale(min, 0, 255, 0, panel->backlight.max);
1613 }
1614
1615 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1616 {
1617         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1618         struct intel_panel *panel = &connector->panel;
1619         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1620         bool alt, cpu_mode;
1621
1622         if (HAS_PCH_LPT(dev_priv))
1623                 alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1624         else
1625                 alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1626         panel->backlight.alternate_pwm_increment = alt;
1627
1628         pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1629         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1630
1631         pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1632         panel->backlight.max = pch_ctl2 >> 16;
1633
1634         cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1635
1636         if (!panel->backlight.max)
1637                 panel->backlight.max = get_backlight_max_vbt(connector);
1638
1639         if (!panel->backlight.max)
1640                 return -ENODEV;
1641
1642         panel->backlight.min = get_backlight_min_vbt(connector);
1643
1644         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1645
1646         cpu_mode = panel->backlight.enabled && HAS_PCH_LPT(dev_priv) &&
1647                    !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1648                    (cpu_ctl2 & BLM_PWM_ENABLE);
1649         if (cpu_mode)
1650                 val = pch_get_backlight(connector);
1651         else
1652                 val = lpt_get_backlight(connector);
1653         val = intel_panel_compute_brightness(connector, val);
1654         panel->backlight.level = clamp(val, panel->backlight.min,
1655                                        panel->backlight.max);
1656
1657         if (cpu_mode) {
1658                 drm_dbg_kms(&dev_priv->drm,
1659                             "CPU backlight register was enabled, switching to PCH override\n");
1660
1661                 /* Write converted CPU PWM value to PCH override register */
1662                 lpt_set_backlight(connector->base.state, panel->backlight.level);
1663                 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1664                                pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1665
1666                 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
1667                                cpu_ctl2 & ~BLM_PWM_ENABLE);
1668         }
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 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.setup))
1985                 return -ENODEV;
1986
1987         /* set level and max in panel struct */
1988         mutex_lock(&dev_priv->backlight_lock);
1989         ret = panel->backlight.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 /* Set up chip specific backlight functions */
2020 static void
2021 intel_panel_init_backlight_funcs(struct intel_panel *panel)
2022 {
2023         struct intel_connector *connector =
2024                 container_of(panel, struct intel_connector, panel);
2025         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
2026
2027         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
2028             intel_dp_aux_init_backlight_funcs(connector) == 0)
2029                 return;
2030
2031         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
2032             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
2033                 return;
2034
2035         if (IS_GEN9_LP(dev_priv)) {
2036                 panel->backlight.setup = bxt_setup_backlight;
2037                 panel->backlight.enable = bxt_enable_backlight;
2038                 panel->backlight.disable = bxt_disable_backlight;
2039                 panel->backlight.set = bxt_set_backlight;
2040                 panel->backlight.get = bxt_get_backlight;
2041                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
2042         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
2043                 panel->backlight.setup = cnp_setup_backlight;
2044                 panel->backlight.enable = cnp_enable_backlight;
2045                 panel->backlight.disable = cnp_disable_backlight;
2046                 panel->backlight.set = bxt_set_backlight;
2047                 panel->backlight.get = bxt_get_backlight;
2048                 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
2049         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
2050                 panel->backlight.setup = lpt_setup_backlight;
2051                 panel->backlight.enable = lpt_enable_backlight;
2052                 panel->backlight.disable = lpt_disable_backlight;
2053                 panel->backlight.set = lpt_set_backlight;
2054                 panel->backlight.get = lpt_get_backlight;
2055                 if (HAS_PCH_LPT(dev_priv))
2056                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
2057                 else
2058                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
2059         } else if (HAS_PCH_SPLIT(dev_priv)) {
2060                 panel->backlight.setup = pch_setup_backlight;
2061                 panel->backlight.enable = pch_enable_backlight;
2062                 panel->backlight.disable = pch_disable_backlight;
2063                 panel->backlight.set = pch_set_backlight;
2064                 panel->backlight.get = pch_get_backlight;
2065                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
2066         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
2067                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
2068                         panel->backlight.setup = pwm_setup_backlight;
2069                         panel->backlight.enable = pwm_enable_backlight;
2070                         panel->backlight.disable = pwm_disable_backlight;
2071                         panel->backlight.set = pwm_set_backlight;
2072                         panel->backlight.get = pwm_get_backlight;
2073                 } else {
2074                         panel->backlight.setup = vlv_setup_backlight;
2075                         panel->backlight.enable = vlv_enable_backlight;
2076                         panel->backlight.disable = vlv_disable_backlight;
2077                         panel->backlight.set = vlv_set_backlight;
2078                         panel->backlight.get = vlv_get_backlight;
2079                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
2080                 }
2081         } else if (IS_GEN(dev_priv, 4)) {
2082                 panel->backlight.setup = i965_setup_backlight;
2083                 panel->backlight.enable = i965_enable_backlight;
2084                 panel->backlight.disable = i965_disable_backlight;
2085                 panel->backlight.set = i9xx_set_backlight;
2086                 panel->backlight.get = i9xx_get_backlight;
2087                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
2088         } else {
2089                 panel->backlight.setup = i9xx_setup_backlight;
2090                 panel->backlight.enable = i9xx_enable_backlight;
2091                 panel->backlight.disable = i9xx_disable_backlight;
2092                 panel->backlight.set = i9xx_set_backlight;
2093                 panel->backlight.get = i9xx_get_backlight;
2094                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
2095         }
2096 }
2097
2098 enum drm_connector_status
2099 intel_panel_detect(struct drm_connector *connector, bool force)
2100 {
2101         struct drm_i915_private *i915 = to_i915(connector->dev);
2102
2103         if (!INTEL_DISPLAY_ENABLED(i915))
2104                 return connector_status_disconnected;
2105
2106         return connector_status_connected;
2107 }
2108
2109 int intel_panel_init(struct intel_panel *panel,
2110                      struct drm_display_mode *fixed_mode,
2111                      struct drm_display_mode *downclock_mode)
2112 {
2113         intel_panel_init_backlight_funcs(panel);
2114
2115         panel->fixed_mode = fixed_mode;
2116         panel->downclock_mode = downclock_mode;
2117
2118         return 0;
2119 }
2120
2121 void intel_panel_fini(struct intel_panel *panel)
2122 {
2123         struct intel_connector *intel_connector =
2124                 container_of(panel, struct intel_connector, panel);
2125
2126         intel_panel_destroy_backlight(panel);
2127
2128         if (panel->fixed_mode)
2129                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2130
2131         if (panel->downclock_mode)
2132                 drm_mode_destroy(intel_connector->base.dev,
2133                                 panel->downclock_mode);
2134 }