sys/dev/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/kernel.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/pwm.h>
  36 #include "intel_drv.h"
  37
  38 #define CRC_PMIC_PWM_PERIOD_NS  21333
  39
  40 void
  41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  42                        struct drm_display_mode *adjusted_mode)
  43 {
  44         drm_mode_copy(adjusted_mode, fixed_mode);
  45
  46         drm_mode_set_crtcinfo(adjusted_mode, 0);
  47 }
  48
  49 /**
  50  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  51  * @dev_priv: i915 device instance
  52  * @fixed_mode : panel native mode
  53  * @connector: LVDS/eDP connector
  54  *
  55  * Return downclock_avail
  56  * Find the reduced downclock for LVDS/eDP in EDID.
  57  */
  58 struct drm_display_mode *
  59 intel_find_panel_downclock(struct drm_i915_private *dev_priv,
  60                         struct drm_display_mode *fixed_mode,
  61                         struct drm_connector *connector)
  62 {
  63         struct drm_display_mode *scan, *tmp_mode;
  64         int temp_downclock;
  65
  66         temp_downclock = fixed_mode->clock;
  67         tmp_mode = NULL;
  68
  69         list_for_each_entry(scan, &connector->probed_modes, head) {
  70                 /*
  71                  * If one mode has the same resolution with the fixed_panel
  72                  * mode while they have the different refresh rate, it means
  73                  * that the reduced downclock is found. In such
  74                  * case we can set the different FPx0/1 to dynamically select
  75                  * between low and high frequency.
  76                  */
  77                 if (scan->hdisplay == fixed_mode->hdisplay &&
  78                     scan->hsync_start == fixed_mode->hsync_start &&
  79                     scan->hsync_end == fixed_mode->hsync_end &&
  80                     scan->htotal == fixed_mode->htotal &&
  81                     scan->vdisplay == fixed_mode->vdisplay &&
  82                     scan->vsync_start == fixed_mode->vsync_start &&
  83                     scan->vsync_end == fixed_mode->vsync_end &&
  84                     scan->vtotal == fixed_mode->vtotal) {
  85                         if (scan->clock < temp_downclock) {
  86                                 /*
  87                                  * The downclock is already found. But we
  88                                  * expect to find the lower downclock.
  89                                  */
  90                                 temp_downclock = scan->clock;
  91                                 tmp_mode = scan;
  92                         }
  93                 }
  94         }
  95
  96         if (temp_downclock < fixed_mode->clock)
  97                 return drm_mode_duplicate(&dev_priv->drm, tmp_mode);
  98         else
  99                 return NULL;
 100 }
 101
 102 /* adjusted_mode has been preset to be the panel's fixed mode */
 103 void
 104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 105                         struct intel_crtc_state *pipe_config,
 106                         int fitting_mode)
 107 {
 108         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 109         int x = 0, y = 0, width = 0, height = 0;
 110
 111         /* Native modes don't need fitting */
 112         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 113             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
 114             !pipe_config->ycbcr420)
 115                 goto done;
 116
 117         switch (fitting_mode) {
 118         case DRM_MODE_SCALE_CENTER:
 119                 width = pipe_config->pipe_src_w;
 120                 height = pipe_config->pipe_src_h;
 121                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 122                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 123                 break;
 124
 125         case DRM_MODE_SCALE_ASPECT:
 126                 /* Scale but preserve the aspect ratio */
 127                 {
 128                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 129                                 * pipe_config->pipe_src_h;
 130                         u32 scaled_height = pipe_config->pipe_src_w
 131                                 * adjusted_mode->crtc_vdisplay;
 132                         if (scaled_width > scaled_height) { /* pillar */
 133                                 width = scaled_height / pipe_config->pipe_src_h;
 134                                 if (width & 1)
 135                                         width++;
 136                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 137                                 y = 0;
 138                                 height = adjusted_mode->crtc_vdisplay;
 139                         } else if (scaled_width < scaled_height) { /* letter */
 140                                 height = scaled_width / pipe_config->pipe_src_w;
 141                                 if (height & 1)
 142                                     height++;
 143                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 144                                 x = 0;
 145                                 width = adjusted_mode->crtc_hdisplay;
 146                         } else {
 147                                 x = y = 0;
 148                                 width = adjusted_mode->crtc_hdisplay;
 149                                 height = adjusted_mode->crtc_vdisplay;
 150                         }
 151                 }
 152                 break;
 153
 154         case DRM_MODE_SCALE_FULLSCREEN:
 155                 x = y = 0;
 156                 width = adjusted_mode->crtc_hdisplay;
 157                 height = adjusted_mode->crtc_vdisplay;
 158                 break;
 159
 160         default:
 161                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 162                 return;
 163         }
 164
 165 done:
 166         pipe_config->pch_pfit.pos = (x << 16) | y;
 167         pipe_config->pch_pfit.size = (width << 16) | height;
 168         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 169 }
 170
 171 static void
 172 centre_horizontally(struct drm_display_mode *adjusted_mode,
 173                     int width)
 174 {
 175         u32 border, sync_pos, blank_width, sync_width;
 176
 177         /* keep the hsync and hblank widths constant */
 178         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 179         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 180         sync_pos = (blank_width - sync_width + 1) / 2;
 181
 182         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 183         border += border & 1; /* make the border even */
 184
 185         adjusted_mode->crtc_hdisplay = width;
 186         adjusted_mode->crtc_hblank_start = width + border;
 187         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 188
 189         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 190         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 191 }
 192
 193 static void
 194 centre_vertically(struct drm_display_mode *adjusted_mode,
 195                   int height)
 196 {
 197         u32 border, sync_pos, blank_width, sync_width;
 198
 199         /* keep the vsync and vblank widths constant */
 200         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 201         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 202         sync_pos = (blank_width - sync_width + 1) / 2;
 203
 204         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 205
 206         adjusted_mode->crtc_vdisplay = height;
 207         adjusted_mode->crtc_vblank_start = height + border;
 208         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 209
 210         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 211         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 212 }
 213
 214 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 215 {
 216         /*
 217          * Floating point operation is not supported. So the FACTOR
 218          * is defined, which can avoid the floating point computation
 219          * when calculating the panel ratio.
 220          */
 221 #define ACCURACY 12
 222 #define FACTOR (1 << ACCURACY)
 223         u32 ratio = source * FACTOR / target;
 224         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 225 }
 226
 227 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 228                               u32 *pfit_control)
 229 {
 230         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 231         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 232                 pipe_config->pipe_src_h;
 233         u32 scaled_height = pipe_config->pipe_src_w *
 234                 adjusted_mode->crtc_vdisplay;
 235
 236         /* 965+ is easy, it does everything in hw */
 237         if (scaled_width > scaled_height)
 238                 *pfit_control |= PFIT_ENABLE |
 239                         PFIT_SCALING_PILLAR;
 240         else if (scaled_width < scaled_height)
 241                 *pfit_control |= PFIT_ENABLE |
 242                         PFIT_SCALING_LETTER;
 243         else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 244                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 245 }
 246
 247 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 248                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 249                               u32 *border)
 250 {
 251         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 252         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 253                 pipe_config->pipe_src_h;
 254         u32 scaled_height = pipe_config->pipe_src_w *
 255                 adjusted_mode->crtc_vdisplay;
 256         u32 bits;
 257
 258         /*
 259          * For earlier chips we have to calculate the scaling
 260          * ratio by hand and program it into the
 261          * PFIT_PGM_RATIO register
 262          */
 263         if (scaled_width > scaled_height) { /* pillar */
 264                 centre_horizontally(adjusted_mode,
 265                                     scaled_height /
 266                                     pipe_config->pipe_src_h);
 267
 268                 *border = LVDS_BORDER_ENABLE;
 269                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 270                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 271                                                     adjusted_mode->crtc_vdisplay);
 272
 273                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 274                                              bits << PFIT_VERT_SCALE_SHIFT);
 275                         *pfit_control |= (PFIT_ENABLE |
 276                                           VERT_INTERP_BILINEAR |
 277                                           HORIZ_INTERP_BILINEAR);
 278                 }
 279         } else if (scaled_width < scaled_height) { /* letter */
 280                 centre_vertically(adjusted_mode,
 281                                   scaled_width /
 282                                   pipe_config->pipe_src_w);
 283
 284                 *border = LVDS_BORDER_ENABLE;
 285                 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 286                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 287                                                     adjusted_mode->crtc_hdisplay);
 288
 289                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 290                                              bits << PFIT_VERT_SCALE_SHIFT);
 291                         *pfit_control |= (PFIT_ENABLE |
 292                                           VERT_INTERP_BILINEAR |
 293                                           HORIZ_INTERP_BILINEAR);
 294                 }
 295         } else {
 296                 /* Aspects match, Let hw scale both directions */
 297                 *pfit_control |= (PFIT_ENABLE |
 298                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 299                                   VERT_INTERP_BILINEAR |
 300                                   HORIZ_INTERP_BILINEAR);
 301         }
 302 }
 303
 304 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 305                               struct intel_crtc_state *pipe_config,
 306                               int fitting_mode)
 307 {
 308         struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
 309         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 310         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 311
 312         /* Native modes don't need fitting */
 313         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 314             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 315                 goto out;
 316
 317         switch (fitting_mode) {
 318         case DRM_MODE_SCALE_CENTER:
 319                 /*
 320                  * For centered modes, we have to calculate border widths &
 321                  * heights and modify the values programmed into the CRTC.
 322                  */
 323                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 324                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 325                 border = LVDS_BORDER_ENABLE;
 326                 break;
 327         case DRM_MODE_SCALE_ASPECT:
 328                 /* Scale but preserve the aspect ratio */
 329                 if (INTEL_GEN(dev_priv) >= 4)
 330                         i965_scale_aspect(pipe_config, &pfit_control);
 331                 else
 332                         i9xx_scale_aspect(pipe_config, &pfit_control,
 333                                           &pfit_pgm_ratios, &border);
 334                 break;
 335         case DRM_MODE_SCALE_FULLSCREEN:
 336                 /*
 337                  * Full scaling, even if it changes the aspect ratio.
 338                  * Fortunately this is all done for us in hw.
 339                  */
 340                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 341                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 342                         pfit_control |= PFIT_ENABLE;
 343                         if (INTEL_GEN(dev_priv) >= 4)
 344                                 pfit_control |= PFIT_SCALING_AUTO;
 345                         else
 346                                 pfit_control |= (VERT_AUTO_SCALE |
 347                                                  VERT_INTERP_BILINEAR |
 348                                                  HORIZ_AUTO_SCALE |
 349                                                  HORIZ_INTERP_BILINEAR);
 350                 }
 351                 break;
 352         default:
 353                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 354                 return;
 355         }
 356
 357         /* 965+ wants fuzzy fitting */
 358         /* FIXME: handle multiple panels by failing gracefully */
 359         if (INTEL_GEN(dev_priv) >= 4)
 360                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 361                                  PFIT_FILTER_FUZZY);
 362
 363 out:
 364         if ((pfit_control & PFIT_ENABLE) == 0) {
 365                 pfit_control = 0;
 366                 pfit_pgm_ratios = 0;
 367         }
 368
 369         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 370         if (INTEL_GEN(dev_priv) < 4 && pipe_config->pipe_bpp == 18)
 371                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 372
 373         pipe_config->gmch_pfit.control = pfit_control;
 374         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 375         pipe_config->gmch_pfit.lvds_border_bits = border;
 376 }
 377
 378 enum drm_connector_status
 379 intel_panel_detect(struct drm_i915_private *dev_priv)
 380 {
 381         /* Assume that the BIOS does not lie through the OpRegion... */
 382         if (!i915_modparams.panel_ignore_lid && dev_priv->opregion.lid_state) {
 383                 return *dev_priv->opregion.lid_state & 0x1 ?
 384                         connector_status_connected :
 385                         connector_status_disconnected;
 386         }
 387
 388         switch (i915_modparams.panel_ignore_lid) {
 389         case -2:
 390                 return connector_status_connected;
 391         case -1:
 392                 return connector_status_disconnected;
 393         default:
 394                 return connector_status_unknown;
 395         }
 396 }
 397
 398 /**
 399  * scale - scale values from one range to another
 400  *
 401  * @source_val: value in range [@source_min..@source_max]
 402  *
 403  * Return @source_val in range [@source_min..@source_max] scaled to range
 404  * [@target_min..@target_max].
 405  */
 406 static uint32_t scale(uint32_t source_val,
 407                       uint32_t source_min, uint32_t source_max,
 408                       uint32_t target_min, uint32_t target_max)
 409 {
 410         uint64_t target_val;
 411
 412         WARN_ON(source_min > source_max);
 413         WARN_ON(target_min > target_max);
 414
 415         /* defensive */
 416         source_val = clamp(source_val, source_min, source_max);
 417
 418         /* avoid overflows */
 419         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 420                         (target_max - target_min), source_max - source_min);
 421         target_val += target_min;
 422
 423         return target_val;
 424 }
 425
 426 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 427 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 428                                    u32 user_level, u32 user_max)
 429 {
 430         struct intel_panel *panel = &connector->panel;
 431
 432         return scale(user_level, 0, user_max,
 433                      panel->backlight.min, panel->backlight.max);
 434 }
 435
 436 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 437  * to [hw_min..hw_max]. */
 438 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 439                                    u32 user_level, u32 user_max)
 440 {
 441         struct intel_panel *panel = &connector->panel;
 442         u32 hw_level;
 443
 444         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 445         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 446
 447         return hw_level;
 448 }
 449
 450 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 451 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 452                                    u32 hw_level, u32 user_max)
 453 {
 454         struct intel_panel *panel = &connector->panel;
 455
 456         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 457                      0, user_max);
 458 }
 459
 460 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 461                                           u32 val)
 462 {
 463         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 464         struct intel_panel *panel = &connector->panel;
 465
 466         WARN_ON(panel->backlight.max == 0);
 467
 468         if (i915_modparams.invert_brightness < 0)
 469                 return val;
 470
 471         if (i915_modparams.invert_brightness > 0 ||
 472             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 473                 return panel->backlight.max - val + panel->backlight.min;
 474         }
 475
 476         return val;
 477 }
 478
 479 static u32 lpt_get_backlight(struct intel_connector *connector)
 480 {
 481         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 482
 483         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 484 }
 485
 486 static u32 pch_get_backlight(struct intel_connector *connector)
 487 {
 488         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 489
 490         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 491 }
 492
 493 static u32 i9xx_get_backlight(struct intel_connector *connector)
 494 {
 495         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 496         struct intel_panel *panel = &connector->panel;
 497         u32 val;
 498
 499         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 500         if (INTEL_INFO(dev_priv)->gen < 4)
 501                 val >>= 1;
 502
 503         if (panel->backlight.combination_mode) {
 504                 u8 lbpc;
 505
 506                 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
 507                 val *= lbpc;
 508         }
 509
 510         return val;
 511 }
 512
 513 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
 514 {
 515         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 516                 return 0;
 517
 518         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 519 }
 520
 521 static u32 vlv_get_backlight(struct intel_connector *connector)
 522 {
 523         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 524         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 525
 526         return _vlv_get_backlight(dev_priv, pipe);
 527 }
 528
 529 static u32 bxt_get_backlight(struct intel_connector *connector)
 530 {
 531         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 532         struct intel_panel *panel = &connector->panel;
 533
 534         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 535 }
 536
 537 static u32 pwm_get_backlight(struct intel_connector *connector)
 538 {
 539         struct intel_panel *panel = &connector->panel;
 540         int duty_ns;
 541
 542         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 543         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 544 }
 545
 546 #if 0
 547 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 548 {
 549         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 550         struct intel_panel *panel = &connector->panel;
 551         u32 val = 0;
 552
 553         mutex_lock(&dev_priv->backlight_lock);
 554
 555         if (panel->backlight.enabled) {
 556                 val = panel->backlight.get(connector);
 557                 val = intel_panel_compute_brightness(connector, val);
 558         }
 559
 560         mutex_unlock(&dev_priv->backlight_lock);
 561
 562         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 563         return val;
 564 }
 565 #endif
 566
 567 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 568 {
 569         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 570         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 571
 572         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 573         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 574 }
 575
 576 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 577 {
 578         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 579         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 580         u32 tmp;
 581
 582         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 583         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 584 }
 585
 586 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 587 {
 588         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 589         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 590         struct intel_panel *panel = &connector->panel;
 591         u32 tmp, mask;
 592
 593         WARN_ON(panel->backlight.max == 0);
 594
 595         if (panel->backlight.combination_mode) {
 596                 u8 lbpc;
 597
 598                 lbpc = level * 0xfe / panel->backlight.max + 1;
 599                 level /= lbpc;
 600                 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
 601         }
 602
 603         if (IS_GEN4(dev_priv)) {
 604                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 605         } else {
 606                 level <<= 1;
 607                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 608         }
 609
 610         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 611         I915_WRITE(BLC_PWM_CTL, tmp | level);
 612 }
 613
 614 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 615 {
 616         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 617         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 618         enum i915_pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 619         u32 tmp;
 620
 621         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 622         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 623 }
 624
 625 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 626 {
 627         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 628         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 629         struct intel_panel *panel = &connector->panel;
 630
 631         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 632 }
 633
 634 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 635 {
 636         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 637         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 638
 639         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 640 }
 641
 642 static void
 643 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 644 {
 645         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 646         struct intel_panel *panel = &connector->panel;
 647
 648         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 649
 650         level = intel_panel_compute_brightness(connector, level);
 651         panel->backlight.set(conn_state, level);
 652 }
 653
 654 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 655 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
 656                                       u32 user_level, u32 user_max)
 657 {
 658         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 659         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 660         struct intel_panel *panel = &connector->panel;
 661         u32 hw_level;
 662
 663         if (!panel->backlight.present)
 664                 return;
 665
 666         mutex_lock(&dev_priv->backlight_lock);
 667
 668         WARN_ON(panel->backlight.max == 0);
 669
 670         hw_level = scale_user_to_hw(connector, user_level, user_max);
 671         panel->backlight.level = hw_level;
 672
 673         if (panel->backlight.enabled)
 674                 intel_panel_actually_set_backlight(conn_state, hw_level);
 675
 676         mutex_unlock(&dev_priv->backlight_lock);
 677 }
 678
 679 /* set backlight brightness to level in range [0..max], assuming hw min is
 680  * respected.
 681  */
 682 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 683                                     u32 user_level, u32 user_max)
 684 {
 685         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 686         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 687         struct intel_panel *panel = &connector->panel;
 688         u32 hw_level;
 689
 690         /*
 691          * Lack of crtc may occur during driver init because
 692          * connection_mutex isn't held across the entire backlight
 693          * setup + modeset readout, and the BIOS can issue the
 694          * requests at any time.
 695          */
 696         if (!panel->backlight.present || !conn_state->crtc)
 697                 return;
 698
 699         mutex_lock(&dev_priv->backlight_lock);
 700
 701         WARN_ON(panel->backlight.max == 0);
 702
 703         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 704         panel->backlight.level = hw_level;
 705
 706         if (panel->backlight.device)
 707                 panel->backlight.device->props.brightness =
 708                         scale_hw_to_user(connector,
 709                                          panel->backlight.level,
 710                                          panel->backlight.device->props.max_brightness);
 711
 712         if (panel->backlight.enabled)
 713                 intel_panel_actually_set_backlight(conn_state, hw_level);
 714
 715         mutex_unlock(&dev_priv->backlight_lock);
 716 }
 717
 718 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
 719 {
 720         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 721         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 722         u32 tmp;
 723
 724         intel_panel_actually_set_backlight(old_conn_state, 0);
 725
 726         /*
 727          * Although we don't support or enable CPU PWM with LPT/SPT based
 728          * systems, it may have been enabled prior to loading the
 729          * driver. Disable to avoid warnings on LCPLL disable.
 730          *
 731          * This needs rework if we need to add support for CPU PWM on PCH split
 732          * platforms.
 733          */
 734         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 735         if (tmp & BLM_PWM_ENABLE) {
 736                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
 737                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 738         }
 739
 740         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 741         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 742 }
 743
 744 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
 745 {
 746         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 747         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 748         u32 tmp;
 749
 750         intel_panel_actually_set_backlight(old_conn_state, 0);
 751
 752         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 753         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 754
 755         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 756         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 757 }
 758
 759 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
 760 {
 761         intel_panel_actually_set_backlight(old_conn_state, 0);
 762 }
 763
 764 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
 765 {
 766         struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 767         u32 tmp;
 768
 769         intel_panel_actually_set_backlight(old_conn_state, 0);
 770
 771         tmp = I915_READ(BLC_PWM_CTL2);
 772         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 773 }
 774
 775 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
 776 {
 777         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 778         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 779         enum i915_pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 780         u32 tmp;
 781
 782         intel_panel_actually_set_backlight(old_conn_state, 0);
 783
 784         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 785         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 786 }
 787
 788 static void bxt_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         struct intel_panel *panel = &connector->panel;
 793         u32 tmp, val;
 794
 795         intel_panel_actually_set_backlight(old_conn_state, 0);
 796
 797         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 798         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 799                         tmp & ~BXT_BLC_PWM_ENABLE);
 800
 801         if (panel->backlight.controller == 1) {
 802                 val = I915_READ(UTIL_PIN_CTL);
 803                 val &= ~UTIL_PIN_ENABLE;
 804                 I915_WRITE(UTIL_PIN_CTL, val);
 805         }
 806 }
 807
 808 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
 809 {
 810         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 811         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 812         struct intel_panel *panel = &connector->panel;
 813         u32 tmp;
 814
 815         intel_panel_actually_set_backlight(old_conn_state, 0);
 816
 817         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 818         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 819                    tmp & ~BXT_BLC_PWM_ENABLE);
 820 }
 821
 822 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
 823 {
 824         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 825         struct intel_panel *panel = &connector->panel;
 826
 827         /* Disable the backlight */
 828         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 829         usleep_range(2000, 3000);
 830         pwm_disable(panel->backlight.pwm);
 831 }
 832
 833 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
 834 {
 835         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 836         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 837         struct intel_panel *panel = &connector->panel;
 838
 839         if (!panel->backlight.present)
 840                 return;
 841
 842         /*
 843          * Do not disable backlight on the vga_switcheroo path. When switching
 844          * away from i915, the other client may depend on i915 to handle the
 845          * backlight. This will leave the backlight on unnecessarily when
 846          * another client is not activated.
 847          */
 848         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 849                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 850                 return;
 851         }
 852
 853         mutex_lock(&dev_priv->backlight_lock);
 854
 855         if (panel->backlight.device)
 856                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 857         panel->backlight.enabled = false;
 858         panel->backlight.disable(old_conn_state);
 859
 860         mutex_unlock(&dev_priv->backlight_lock);
 861 }
 862
 863 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 864                                  const struct drm_connector_state *conn_state)
 865 {
 866         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 867         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 868         struct intel_panel *panel = &connector->panel;
 869         u32 pch_ctl1, pch_ctl2, schicken;
 870
 871         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 872         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 873                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 874                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 875                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 876         }
 877
 878         if (HAS_PCH_LPT(dev_priv)) {
 879                 schicken = I915_READ(SOUTH_CHICKEN2);
 880                 if (panel->backlight.alternate_pwm_increment)
 881                         schicken |= LPT_PWM_GRANULARITY;
 882                 else
 883                         schicken &= ~LPT_PWM_GRANULARITY;
 884                 I915_WRITE(SOUTH_CHICKEN2, schicken);
 885         } else {
 886                 schicken = I915_READ(SOUTH_CHICKEN1);
 887                 if (panel->backlight.alternate_pwm_increment)
 888                         schicken |= SPT_PWM_GRANULARITY;
 889                 else
 890                         schicken &= ~SPT_PWM_GRANULARITY;
 891                 I915_WRITE(SOUTH_CHICKEN1, schicken);
 892         }
 893
 894         pch_ctl2 = panel->backlight.max << 16;
 895         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 896
 897         pch_ctl1 = 0;
 898         if (panel->backlight.active_low_pwm)
 899                 pch_ctl1 |= BLM_PCH_POLARITY;
 900
 901         /* After LPT, override is the default. */
 902         if (HAS_PCH_LPT(dev_priv))
 903                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 904
 905         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 906         POSTING_READ(BLC_PWM_PCH_CTL1);
 907         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 908
 909         /* This won't stick until the above enable. */
 910         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 911 }
 912
 913 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 914                                  const struct drm_connector_state *conn_state)
 915 {
 916         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 917         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 918         struct intel_panel *panel = &connector->panel;
 919         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 920         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 921
 922         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 923         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 924                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 925                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 926                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 927         }
 928
 929         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 930         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 931                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 932                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 933                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 934         }
 935
 936         if (cpu_transcoder == TRANSCODER_EDP)
 937                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 938         else
 939                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 940         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 941         POSTING_READ(BLC_PWM_CPU_CTL2);
 942         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 943
 944         /* This won't stick until the above enable. */
 945         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 946
 947         pch_ctl2 = panel->backlight.max << 16;
 948         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 949
 950         pch_ctl1 = 0;
 951         if (panel->backlight.active_low_pwm)
 952                 pch_ctl1 |= BLM_PCH_POLARITY;
 953
 954         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 955         POSTING_READ(BLC_PWM_PCH_CTL1);
 956         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 957 }
 958
 959 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
 960                                   const struct drm_connector_state *conn_state)
 961 {
 962         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 963         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 964         struct intel_panel *panel = &connector->panel;
 965         u32 ctl, freq;
 966
 967         ctl = I915_READ(BLC_PWM_CTL);
 968         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 969                 DRM_DEBUG_KMS("backlight already enabled\n");
 970                 I915_WRITE(BLC_PWM_CTL, 0);
 971         }
 972
 973         freq = panel->backlight.max;
 974         if (panel->backlight.combination_mode)
 975                 freq /= 0xff;
 976
 977         ctl = freq << 17;
 978         if (panel->backlight.combination_mode)
 979                 ctl |= BLM_LEGACY_MODE;
 980         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
 981                 ctl |= BLM_POLARITY_PNV;
 982
 983         I915_WRITE(BLC_PWM_CTL, ctl);
 984         POSTING_READ(BLC_PWM_CTL);
 985
 986         /* XXX: combine this into above write? */
 987         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 988
 989         /*
 990          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 991          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 992          * that has backlight.
 993          */
 994         if (IS_GEN2(dev_priv))
 995                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 996 }
 997
 998 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
 999                                   const struct drm_connector_state *conn_state)
1000 {
1001         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1002         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1003         struct intel_panel *panel = &connector->panel;
1004         enum i915_pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1005         u32 ctl, ctl2, freq;
1006
1007         ctl2 = I915_READ(BLC_PWM_CTL2);
1008         if (ctl2 & BLM_PWM_ENABLE) {
1009                 DRM_DEBUG_KMS("backlight already enabled\n");
1010                 ctl2 &= ~BLM_PWM_ENABLE;
1011                 I915_WRITE(BLC_PWM_CTL2, ctl2);
1012         }
1013
1014         freq = panel->backlight.max;
1015         if (panel->backlight.combination_mode)
1016                 freq /= 0xff;
1017
1018         ctl = freq << 16;
1019         I915_WRITE(BLC_PWM_CTL, ctl);
1020
1021         ctl2 = BLM_PIPE(pipe);
1022         if (panel->backlight.combination_mode)
1023                 ctl2 |= BLM_COMBINATION_MODE;
1024         if (panel->backlight.active_low_pwm)
1025                 ctl2 |= BLM_POLARITY_I965;
1026         I915_WRITE(BLC_PWM_CTL2, ctl2);
1027         POSTING_READ(BLC_PWM_CTL2);
1028         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1029
1030         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1031 }
1032
1033 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1034                                  const struct drm_connector_state *conn_state)
1035 {
1036         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1037         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1038         struct intel_panel *panel = &connector->panel;
1039         enum i915_pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1040         u32 ctl, ctl2;
1041
1042         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1043         if (ctl2 & BLM_PWM_ENABLE) {
1044                 DRM_DEBUG_KMS("backlight already enabled\n");
1045                 ctl2 &= ~BLM_PWM_ENABLE;
1046                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1047         }
1048
1049         ctl = panel->backlight.max << 16;
1050         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1051
1052         /* XXX: combine this into above write? */
1053         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1054
1055         ctl2 = 0;
1056         if (panel->backlight.active_low_pwm)
1057                 ctl2 |= BLM_POLARITY_I965;
1058         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1059         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1060         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1061 }
1062
1063 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1064                                  const struct drm_connector_state *conn_state)
1065 {
1066         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1067         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1068         struct intel_panel *panel = &connector->panel;
1069         enum i915_pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1070         u32 pwm_ctl, val;
1071
1072         /* Controller 1 uses the utility pin. */
1073         if (panel->backlight.controller == 1) {
1074                 val = I915_READ(UTIL_PIN_CTL);
1075                 if (val & UTIL_PIN_ENABLE) {
1076                         DRM_DEBUG_KMS("util pin already enabled\n");
1077                         val &= ~UTIL_PIN_ENABLE;
1078                         I915_WRITE(UTIL_PIN_CTL, val);
1079                 }
1080
1081                 val = 0;
1082                 if (panel->backlight.util_pin_active_low)
1083                         val |= UTIL_PIN_POLARITY;
1084                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1085                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1086         }
1087
1088         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1089         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1090                 DRM_DEBUG_KMS("backlight already enabled\n");
1091                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1092                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1093                                 pwm_ctl);
1094         }
1095
1096         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1097                         panel->backlight.max);
1098
1099         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1100
1101         pwm_ctl = 0;
1102         if (panel->backlight.active_low_pwm)
1103                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1104
1105         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1106         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1107         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1108                         pwm_ctl | BXT_BLC_PWM_ENABLE);
1109 }
1110
1111 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1112                                  const struct drm_connector_state *conn_state)
1113 {
1114         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1115         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1116         struct intel_panel *panel = &connector->panel;
1117         u32 pwm_ctl;
1118
1119         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1120         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1121                 DRM_DEBUG_KMS("backlight already enabled\n");
1122                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1123                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1124                            pwm_ctl);
1125         }
1126
1127         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1128                    panel->backlight.max);
1129
1130         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1131
1132         pwm_ctl = 0;
1133         if (panel->backlight.active_low_pwm)
1134                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1135
1136         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1137         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1138         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1139                    pwm_ctl | BXT_BLC_PWM_ENABLE);
1140 }
1141
1142 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1143                                  const struct drm_connector_state *conn_state)
1144 {
1145         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1146         struct intel_panel *panel = &connector->panel;
1147
1148         pwm_enable(panel->backlight.pwm);
1149         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1150 }
1151
1152 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1153                                   const struct drm_connector_state *conn_state)
1154 {
1155         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1156         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1157         struct intel_panel *panel = &connector->panel;
1158         enum i915_pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1159
1160         if (!panel->backlight.present)
1161                 return;
1162
1163         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1164
1165         mutex_lock(&dev_priv->backlight_lock);
1166
1167         WARN_ON(panel->backlight.max == 0);
1168
1169         if (panel->backlight.level <= panel->backlight.min) {
1170                 panel->backlight.level = panel->backlight.max;
1171                 if (panel->backlight.device)
1172                         panel->backlight.device->props.brightness =
1173                                 scale_hw_to_user(connector,
1174                                                  panel->backlight.level,
1175                                                  panel->backlight.device->props.max_brightness);
1176         }
1177
1178         panel->backlight.enable(crtc_state, conn_state);
1179         panel->backlight.enabled = true;
1180         if (panel->backlight.device)
1181                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1182
1183         mutex_unlock(&dev_priv->backlight_lock);
1184 }
1185
1186 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1187 #if 0 /* unused */
1188 static int intel_backlight_device_update_status(struct backlight_device *bd)
1189 {
1190         struct intel_connector *connector = bl_get_data(bd);
1191         struct intel_panel *panel = &connector->panel;
1192         struct drm_device *dev = connector->base.dev;
1193
1194         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1195         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1196                       bd->props.brightness, bd->props.max_brightness);
1197         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1198                                   bd->props.max_brightness);
1199
1200         /*
1201          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1202          * backlight class device does not make it easy to to differentiate
1203          * between callbacks for brightness and bl_power, so our backlight_power
1204          * callback needs to take this into account.
1205          */
1206         if (panel->backlight.enabled) {
1207                 if (panel->backlight.power) {
1208                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1209                                 bd->props.brightness != 0;
1210                         panel->backlight.power(connector, enable);
1211                 }
1212         } else {
1213                 bd->props.power = FB_BLANK_POWERDOWN;
1214         }
1215
1216         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1217         return 0;
1218 }
1219
1220 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1221 {
1222         struct intel_connector *connector = bl_get_data(bd);
1223         struct drm_device *dev = connector->base.dev;
1224         struct drm_i915_private *dev_priv = to_i915(dev);
1225         u32 hw_level;
1226         int ret;
1227
1228         intel_runtime_pm_get(dev_priv);
1229         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1230
1231         hw_level = intel_panel_get_backlight(connector);
1232         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1233
1234         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1235         intel_runtime_pm_put(dev_priv);
1236
1237         return ret;
1238 }
1239
1240 static const struct backlight_ops intel_backlight_device_ops = {
1241         .update_status = intel_backlight_device_update_status,
1242         .get_brightness = intel_backlight_device_get_brightness,
1243 };
1244 #endif
1245
1246 int intel_backlight_device_register(struct intel_connector *connector)
1247 {
1248         struct intel_panel *panel = &connector->panel;
1249         struct backlight_properties props;
1250
1251         if (WARN_ON(panel->backlight.device))
1252                 return -ENODEV;
1253
1254         if (!panel->backlight.present)
1255                 return 0;
1256
1257         WARN_ON(panel->backlight.max == 0);
1258
1259         memset(&props, 0, sizeof(props));
1260         props.type = BACKLIGHT_RAW;
1261
1262         /*
1263          * Note: Everything should work even if the backlight device max
1264          * presented to the userspace is arbitrarily chosen.
1265          */
1266         props.max_brightness = panel->backlight.max;
1267         props.brightness = scale_hw_to_user(connector,
1268                                             panel->backlight.level,
1269                                             props.max_brightness);
1270
1271         if (panel->backlight.enabled)
1272                 props.power = FB_BLANK_UNBLANK;
1273         else
1274                 props.power = FB_BLANK_POWERDOWN;
1275
1276         /*
1277          * Note: using the same name independent of the connector prevents
1278          * registration of multiple backlight devices in the driver.
1279          */
1280 #if 0
1281         panel->backlight.device =
1282                 backlight_device_register("intel_backlight",
1283                                           connector->base.kdev,
1284                                           connector,
1285                                           &intel_backlight_device_ops, &props);
1286
1287         if (IS_ERR(panel->backlight.device)) {
1288                 DRM_ERROR("Failed to register backlight: %ld\n",
1289                           PTR_ERR(panel->backlight.device));
1290                 panel->backlight.device = NULL;
1291                 return -ENODEV;
1292         }
1293
1294         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1295                       connector->base.name);
1296 #endif
1297
1298         return 0;
1299 }
1300
1301 void intel_backlight_device_unregister(struct intel_connector *connector)
1302 {
1303 #if 0
1304         struct intel_panel *panel = &connector->panel;
1305
1306         if (panel->backlight.device) {
1307                 backlight_device_unregister(panel->backlight.device);
1308                 panel->backlight.device = NULL;
1309         }
1310 #endif
1311 }
1312 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1313
1314 /*
1315  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1316  *      PWM increment = 1
1317  */
1318 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1319 {
1320         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1321
1322         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1323 }
1324
1325 /*
1326  * BXT: PWM clock frequency = 19.2 MHz.
1327  */
1328 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1329 {
1330         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1331 }
1332
1333 /*
1334  * SPT: This value represents the period of the PWM stream in clock periods
1335  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1336  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1337  */
1338 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1339 {
1340         struct intel_panel *panel = &connector->panel;
1341         u32 mul;
1342
1343         if (panel->backlight.alternate_pwm_increment)
1344                 mul = 128;
1345         else
1346                 mul = 16;
1347
1348         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1349 }
1350
1351 /*
1352  * LPT: This value represents the period of the PWM stream in clock periods
1353  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1354  * LPT SOUTH_CHICKEN2 register bit 5).
1355  */
1356 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1357 {
1358         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1359         struct intel_panel *panel = &connector->panel;
1360         u32 mul, clock;
1361
1362         if (panel->backlight.alternate_pwm_increment)
1363                 mul = 16;
1364         else
1365                 mul = 128;
1366
1367         if (HAS_PCH_LPT_H(dev_priv))
1368                 clock = MHz(135); /* LPT:H */
1369         else
1370                 clock = MHz(24); /* LPT:LP */
1371
1372         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1373 }
1374
1375 /*
1376  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1377  * display raw clocks multiplied by 128.
1378  */
1379 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1380 {
1381         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1382
1383         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1384 }
1385
1386 /*
1387  * Gen2: This field determines the number of time base events (display core
1388  * clock frequency/32) in total for a complete cycle of modulated backlight
1389  * control.
1390  *
1391  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1392  * divided by 32.
1393  */
1394 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1395 {
1396         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1397         int clock;
1398
1399         if (IS_PINEVIEW(dev_priv))
1400                 clock = KHz(dev_priv->rawclk_freq);
1401         else
1402                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1403
1404         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1405 }
1406
1407 /*
1408  * Gen4: This value represents the period of the PWM stream in display core
1409  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1410  *
1411  */
1412 static u32 i965_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         int clock;
1416
1417         if (IS_G4X(dev_priv))
1418                 clock = KHz(dev_priv->rawclk_freq);
1419         else
1420                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1421
1422         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1423 }
1424
1425 /*
1426  * VLV: This value represents the period of the PWM stream in display core
1427  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1428  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1429  */
1430 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1431 {
1432         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1433         int mul, clock;
1434
1435         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1436                 if (IS_CHERRYVIEW(dev_priv))
1437                         clock = KHz(19200);
1438                 else
1439                         clock = MHz(25);
1440                 mul = 16;
1441         } else {
1442                 clock = KHz(dev_priv->rawclk_freq);
1443                 mul = 128;
1444         }
1445
1446         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1447 }
1448
1449 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1450 {
1451         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1452         struct intel_panel *panel = &connector->panel;
1453         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1454         u32 pwm;
1455
1456         if (!panel->backlight.hz_to_pwm) {
1457                 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1458                 return 0;
1459         }
1460
1461         if (pwm_freq_hz) {
1462                 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1463                               pwm_freq_hz);
1464         } else {
1465                 pwm_freq_hz = 200;
1466                 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1467                               pwm_freq_hz);
1468         }
1469
1470         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1471         if (!pwm) {
1472                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1473                 return 0;
1474         }
1475
1476         return pwm;
1477 }
1478
1479 /*
1480  * Note: The setup hooks can't assume pipe is set!
1481  */
1482 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1483 {
1484         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1485         struct intel_panel *panel = &connector->panel;
1486         int min;
1487
1488         WARN_ON(panel->backlight.max == 0);
1489
1490         /*
1491          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1492          * to problems. There are such machines out there. Either our
1493          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1494          * against this by letting the minimum be at most (arbitrarily chosen)
1495          * 25% of the max.
1496          */
1497         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1498         if (min != dev_priv->vbt.backlight.min_brightness) {
1499                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1500                               dev_priv->vbt.backlight.min_brightness, min);
1501         }
1502
1503         /* vbt value is a coefficient in range [0..255] */
1504         return scale(min, 0, 255, 0, panel->backlight.max);
1505 }
1506
1507 static int lpt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1508 {
1509         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1510         struct intel_panel *panel = &connector->panel;
1511         u32 pch_ctl1, pch_ctl2, val;
1512         bool alt;
1513
1514         if (HAS_PCH_LPT(dev_priv))
1515                 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1516         else
1517                 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1518         panel->backlight.alternate_pwm_increment = alt;
1519
1520         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1521         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1522
1523         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1524         panel->backlight.max = pch_ctl2 >> 16;
1525
1526         if (!panel->backlight.max)
1527                 panel->backlight.max = get_backlight_max_vbt(connector);
1528
1529         if (!panel->backlight.max)
1530                 return -ENODEV;
1531
1532         panel->backlight.min = get_backlight_min_vbt(connector);
1533
1534         val = lpt_get_backlight(connector);
1535         val = intel_panel_compute_brightness(connector, val);
1536         panel->backlight.level = clamp(val, panel->backlight.min,
1537                                        panel->backlight.max);
1538
1539         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1540
1541         return 0;
1542 }
1543
1544 static int pch_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1545 {
1546         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1547         struct intel_panel *panel = &connector->panel;
1548         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1549
1550         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1551         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1552
1553         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1554         panel->backlight.max = pch_ctl2 >> 16;
1555
1556         if (!panel->backlight.max)
1557                 panel->backlight.max = get_backlight_max_vbt(connector);
1558
1559         if (!panel->backlight.max)
1560                 return -ENODEV;
1561
1562         panel->backlight.min = get_backlight_min_vbt(connector);
1563
1564         val = pch_get_backlight(connector);
1565         val = intel_panel_compute_brightness(connector, val);
1566         panel->backlight.level = clamp(val, panel->backlight.min,
1567                                        panel->backlight.max);
1568
1569         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1570         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1571                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1572
1573         return 0;
1574 }
1575
1576 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1577 {
1578         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1579         struct intel_panel *panel = &connector->panel;
1580         u32 ctl, val;
1581
1582         ctl = I915_READ(BLC_PWM_CTL);
1583
1584         if (IS_GEN2(dev_priv) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1585                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1586
1587         if (IS_PINEVIEW(dev_priv))
1588                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1589
1590         panel->backlight.max = ctl >> 17;
1591
1592         if (!panel->backlight.max) {
1593                 panel->backlight.max = get_backlight_max_vbt(connector);
1594                 panel->backlight.max >>= 1;
1595         }
1596
1597         if (!panel->backlight.max)
1598                 return -ENODEV;
1599
1600         if (panel->backlight.combination_mode)
1601                 panel->backlight.max *= 0xff;
1602
1603         panel->backlight.min = get_backlight_min_vbt(connector);
1604
1605         val = i9xx_get_backlight(connector);
1606         val = intel_panel_compute_brightness(connector, val);
1607         panel->backlight.level = clamp(val, panel->backlight.min,
1608                                        panel->backlight.max);
1609
1610         panel->backlight.enabled = val != 0;
1611
1612         return 0;
1613 }
1614
1615 static int i965_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1616 {
1617         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1618         struct intel_panel *panel = &connector->panel;
1619         u32 ctl, ctl2, val;
1620
1621         ctl2 = I915_READ(BLC_PWM_CTL2);
1622         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1623         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1624
1625         ctl = I915_READ(BLC_PWM_CTL);
1626         panel->backlight.max = ctl >> 16;
1627
1628         if (!panel->backlight.max)
1629                 panel->backlight.max = get_backlight_max_vbt(connector);
1630
1631         if (!panel->backlight.max)
1632                 return -ENODEV;
1633
1634         if (panel->backlight.combination_mode)
1635                 panel->backlight.max *= 0xff;
1636
1637         panel->backlight.min = get_backlight_min_vbt(connector);
1638
1639         val = i9xx_get_backlight(connector);
1640         val = intel_panel_compute_brightness(connector, val);
1641         panel->backlight.level = clamp(val, panel->backlight.min,
1642                                        panel->backlight.max);
1643
1644         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1645
1646         return 0;
1647 }
1648
1649 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_pipe pipe)
1650 {
1651         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1652         struct intel_panel *panel = &connector->panel;
1653         u32 ctl, ctl2, val;
1654
1655         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1656                 return -ENODEV;
1657
1658         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1659         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1660
1661         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1662         panel->backlight.max = ctl >> 16;
1663
1664         if (!panel->backlight.max)
1665                 panel->backlight.max = get_backlight_max_vbt(connector);
1666
1667         if (!panel->backlight.max)
1668                 return -ENODEV;
1669
1670         panel->backlight.min = get_backlight_min_vbt(connector);
1671
1672         val = _vlv_get_backlight(dev_priv, pipe);
1673         val = intel_panel_compute_brightness(connector, val);
1674         panel->backlight.level = clamp(val, panel->backlight.min,
1675                                        panel->backlight.max);
1676
1677         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1678
1679         return 0;
1680 }
1681
1682 static int
1683 bxt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1684 {
1685         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1686         struct intel_panel *panel = &connector->panel;
1687         u32 pwm_ctl, val;
1688
1689         panel->backlight.controller = dev_priv->vbt.backlight.controller;
1690
1691         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1692
1693         /* Controller 1 uses the utility pin. */
1694         if (panel->backlight.controller == 1) {
1695                 val = I915_READ(UTIL_PIN_CTL);
1696                 panel->backlight.util_pin_active_low =
1697                                         val & UTIL_PIN_POLARITY;
1698         }
1699
1700         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1701         panel->backlight.max =
1702                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1703
1704         if (!panel->backlight.max)
1705                 panel->backlight.max = get_backlight_max_vbt(connector);
1706
1707         if (!panel->backlight.max)
1708                 return -ENODEV;
1709
1710         panel->backlight.min = get_backlight_min_vbt(connector);
1711
1712         panel->backlight.min = get_backlight_min_vbt(connector);
1713
1714         val = bxt_get_backlight(connector);
1715         val = intel_panel_compute_brightness(connector, val);
1716         panel->backlight.level = clamp(val, panel->backlight.min,
1717                                        panel->backlight.max);
1718
1719         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1720
1721         return 0;
1722 }
1723
1724 static int
1725 cnp_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1726 {
1727         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1728         struct intel_panel *panel = &connector->panel;
1729         u32 pwm_ctl, val;
1730
1731         /*
1732          * CNP has the BXT implementation of backlight, but with only
1733          * one controller. Future platforms could have multiple controllers
1734          * so let's make this extensible and prepared for the future.
1735          */
1736         panel->backlight.controller = 0;
1737
1738         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1739
1740         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1741         panel->backlight.max =
1742                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1743
1744         if (!panel->backlight.max)
1745                 panel->backlight.max = get_backlight_max_vbt(connector);
1746
1747         if (!panel->backlight.max)
1748                 return -ENODEV;
1749
1750         panel->backlight.min = get_backlight_min_vbt(connector);
1751
1752         panel->backlight.min = get_backlight_min_vbt(connector);
1753
1754         val = bxt_get_backlight(connector);
1755         val = intel_panel_compute_brightness(connector, val);
1756         panel->backlight.level = clamp(val, panel->backlight.min,
1757                                        panel->backlight.max);
1758
1759         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1760
1761         return 0;
1762 }
1763
1764 static int pwm_setup_backlight(struct intel_connector *connector,
1765                                enum i915_pipe pipe)
1766 {
1767         struct drm_device *dev = connector->base.dev;
1768         struct intel_panel *panel = &connector->panel;
1769         int retval;
1770
1771         /* Get the PWM chip for backlight control */
1772         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1773         if (IS_ERR(panel->backlight.pwm)) {
1774                 DRM_ERROR("Failed to own the pwm chip\n");
1775                 panel->backlight.pwm = NULL;
1776                 return -ENODEV;
1777         }
1778
1779         /*
1780          * FIXME: pwm_apply_args() should be removed when switching to
1781          * the atomic PWM API.
1782          */
1783 #if 0
1784         pwm_apply_args(panel->backlight.pwm);
1785 #endif
1786
1787         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1788                             CRC_PMIC_PWM_PERIOD_NS);
1789         if (retval < 0) {
1790                 DRM_ERROR("Failed to configure the pwm chip\n");
1791                 pwm_put(panel->backlight.pwm);
1792                 panel->backlight.pwm = NULL;
1793                 return retval;
1794         }
1795
1796         panel->backlight.min = 0; /* 0% */
1797         panel->backlight.max = 100; /* 100% */
1798         panel->backlight.level = DIV_ROUND_UP(
1799                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1800                                  CRC_PMIC_PWM_PERIOD_NS);
1801         panel->backlight.enabled = panel->backlight.level != 0;
1802
1803         return 0;
1804 }
1805
1806 #ifdef __DragonFly__
1807 /*
1808  * Read max backlight level
1809  */
1810 static int
1811 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1812 {
1813         int err, val;
1814         struct intel_connector *connector = arg1;
1815         struct drm_device *dev = connector->base.dev;
1816         struct drm_i915_private *dev_priv = dev->dev_private;
1817         struct intel_panel *panel = &connector->panel;
1818
1819         mutex_lock(&dev_priv->backlight_lock);
1820         val = panel->backlight.max;
1821         mutex_unlock(&dev_priv->backlight_lock);
1822
1823         err = sysctl_handle_int(oidp, &val, 0, req);
1824         return(err);
1825 }
1826
1827 /*
1828  * Read/write backlight level
1829  */
1830 static int
1831 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1832 {
1833         struct intel_connector *connector = arg1;
1834         const struct drm_connector_state *conn_state = connector->base.state;
1835         struct drm_device *dev = connector->base.dev;
1836         struct drm_i915_private *dev_priv = dev->dev_private;
1837         struct intel_panel *panel = &connector->panel;
1838         int err, val;
1839         u32 user_level, max_brightness;
1840
1841         mutex_lock(&dev_priv->backlight_lock);
1842         max_brightness = panel->backlight.max;
1843         user_level = scale_hw_to_user(connector, panel->backlight.level,
1844             max_brightness);
1845         mutex_unlock(&dev_priv->backlight_lock);
1846
1847         val = user_level;
1848         err = sysctl_handle_int(oidp, &val, 0, req);
1849         if (err != 0 || req->newptr == NULL) {
1850                 return(err);
1851         }
1852
1853         if (val != user_level && val >= 0 && val <= max_brightness) {
1854                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1855                 intel_panel_set_backlight(conn_state, val, max_brightness);
1856                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1857         }
1858
1859         return(err);
1860 }
1861 #endif /* __DragonFly__ */
1862
1863 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe)
1864 {
1865         struct drm_i915_private *dev_priv = to_i915(connector->dev);
1866         struct intel_connector *intel_connector = to_intel_connector(connector);
1867         struct intel_panel *panel = &intel_connector->panel;
1868         int ret;
1869
1870         if (!dev_priv->vbt.backlight.present) {
1871                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1872                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1873                 } else {
1874                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1875                         return 0;
1876                 }
1877         }
1878
1879         /* ensure intel_panel has been initialized first */
1880         if (WARN_ON(!panel->backlight.setup))
1881                 return -ENODEV;
1882
1883         /* set level and max in panel struct */
1884         mutex_lock(&dev_priv->backlight_lock);
1885         ret = panel->backlight.setup(intel_connector, pipe);
1886         mutex_unlock(&dev_priv->backlight_lock);
1887
1888         if (ret) {
1889                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1890                               connector->name);
1891                 return ret;
1892         }
1893
1894         panel->backlight.present = true;
1895
1896 #ifdef __DragonFly__
1897         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1898                         OID_AUTO, "backlight_max",
1899                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1900                         connector, sizeof(int),
1901                         sysctl_backlight_max,
1902                         "I", "Max backlight level");
1903         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1904                         OID_AUTO, "backlight_level",
1905                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1906                         connector, sizeof(int),
1907                         sysctl_backlight_handler,
1908                         "I", "Backlight level");
1909 #endif
1910
1911         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1912                       connector->name,
1913                       enableddisabled(panel->backlight.enabled),
1914                       panel->backlight.level, panel->backlight.max);
1915
1916         return 0;
1917 }
1918
1919 void intel_panel_destroy_backlight(struct drm_connector *connector)
1920 {
1921         struct intel_connector *intel_connector = to_intel_connector(connector);
1922         struct intel_panel *panel = &intel_connector->panel;
1923
1924         /* dispose of the pwm */
1925         if (panel->backlight.pwm)
1926                 pwm_put(panel->backlight.pwm);
1927
1928         panel->backlight.present = false;
1929 }
1930
1931 /* Set up chip specific backlight functions */
1932 static void
1933 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1934 {
1935         struct intel_connector *connector =
1936                 container_of(panel, struct intel_connector, panel);
1937         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1938
1939         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1940             intel_dp_aux_init_backlight_funcs(connector) == 0)
1941                 return;
1942
1943         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1944             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1945                 return;
1946
1947         if (IS_GEN9_LP(dev_priv)) {
1948                 panel->backlight.setup = bxt_setup_backlight;
1949                 panel->backlight.enable = bxt_enable_backlight;
1950                 panel->backlight.disable = bxt_disable_backlight;
1951                 panel->backlight.set = bxt_set_backlight;
1952                 panel->backlight.get = bxt_get_backlight;
1953                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1954         } else if (HAS_PCH_CNP(dev_priv)) {
1955                 panel->backlight.setup = cnp_setup_backlight;
1956                 panel->backlight.enable = cnp_enable_backlight;
1957                 panel->backlight.disable = cnp_disable_backlight;
1958                 panel->backlight.set = bxt_set_backlight;
1959                 panel->backlight.get = bxt_get_backlight;
1960                 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1961         } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
1962                    HAS_PCH_KBP(dev_priv)) {
1963                 panel->backlight.setup = lpt_setup_backlight;
1964                 panel->backlight.enable = lpt_enable_backlight;
1965                 panel->backlight.disable = lpt_disable_backlight;
1966                 panel->backlight.set = lpt_set_backlight;
1967                 panel->backlight.get = lpt_get_backlight;
1968                 if (HAS_PCH_LPT(dev_priv))
1969                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1970                 else
1971                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1972         } else if (HAS_PCH_SPLIT(dev_priv)) {
1973                 panel->backlight.setup = pch_setup_backlight;
1974                 panel->backlight.enable = pch_enable_backlight;
1975                 panel->backlight.disable = pch_disable_backlight;
1976                 panel->backlight.set = pch_set_backlight;
1977                 panel->backlight.get = pch_get_backlight;
1978                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1979         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1980                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1981                         panel->backlight.setup = pwm_setup_backlight;
1982                         panel->backlight.enable = pwm_enable_backlight;
1983                         panel->backlight.disable = pwm_disable_backlight;
1984                         panel->backlight.set = pwm_set_backlight;
1985                         panel->backlight.get = pwm_get_backlight;
1986                 } else {
1987                         panel->backlight.setup = vlv_setup_backlight;
1988                         panel->backlight.enable = vlv_enable_backlight;
1989                         panel->backlight.disable = vlv_disable_backlight;
1990                         panel->backlight.set = vlv_set_backlight;
1991                         panel->backlight.get = vlv_get_backlight;
1992                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1993                 }
1994         } else if (IS_GEN4(dev_priv)) {
1995                 panel->backlight.setup = i965_setup_backlight;
1996                 panel->backlight.enable = i965_enable_backlight;
1997                 panel->backlight.disable = i965_disable_backlight;
1998                 panel->backlight.set = i9xx_set_backlight;
1999                 panel->backlight.get = i9xx_get_backlight;
2000                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
2001         } else {
2002                 panel->backlight.setup = i9xx_setup_backlight;
2003                 panel->backlight.enable = i9xx_enable_backlight;
2004                 panel->backlight.disable = i9xx_disable_backlight;
2005                 panel->backlight.set = i9xx_set_backlight;
2006                 panel->backlight.get = i9xx_get_backlight;
2007                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
2008         }
2009 }
2010
2011 int intel_panel_init(struct intel_panel *panel,
2012                      struct drm_display_mode *fixed_mode,
2013                      struct drm_display_mode *alt_fixed_mode,
2014                      struct drm_display_mode *downclock_mode)
2015 {
2016         intel_panel_init_backlight_funcs(panel);
2017
2018         panel->fixed_mode = fixed_mode;
2019         panel->alt_fixed_mode = alt_fixed_mode;
2020         panel->downclock_mode = downclock_mode;
2021
2022         return 0;
2023 }
2024
2025 void intel_panel_fini(struct intel_panel *panel)
2026 {
2027         struct intel_connector *intel_connector =
2028                 container_of(panel, struct intel_connector, panel);
2029
2030         if (panel->fixed_mode)
2031                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2032
2033         if (panel->alt_fixed_mode)
2034                 drm_mode_destroy(intel_connector->base.dev,
2035                                 panel->alt_fixed_mode);
2036
2037         if (panel->downclock_mode)
2038                 drm_mode_destroy(intel_connector->base.dev,
2039                                 panel->downclock_mode);
2040 }