drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/kernel.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/pwm.h>
  36 #include "intel_drv.h"
  37
  38 #define CRC_PMIC_PWM_PERIOD_NS  21333
  39
  40 void
  41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  42                        struct drm_display_mode *adjusted_mode)
  43 {
  44         drm_mode_copy(adjusted_mode, fixed_mode);
  45
  46         drm_mode_set_crtcinfo(adjusted_mode, 0);
  47 }
  48
  49 /**
  50  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  51  * @dev_priv: i915 device instance
  52  * @fixed_mode : panel native mode
  53  * @connector: LVDS/eDP connector
  54  *
  55  * Return downclock_avail
  56  * Find the reduced downclock for LVDS/eDP in EDID.
  57  */
  58 struct drm_display_mode *
  59 intel_find_panel_downclock(struct drm_i915_private *dev_priv,
  60                         struct drm_display_mode *fixed_mode,
  61                         struct drm_connector *connector)
  62 {
  63         struct drm_display_mode *scan, *tmp_mode;
  64         int temp_downclock;
  65
  66         temp_downclock = fixed_mode->clock;
  67         tmp_mode = NULL;
  68
  69         list_for_each_entry(scan, &connector->probed_modes, head) {
  70                 /*
  71                  * If one mode has the same resolution with the fixed_panel
  72                  * mode while they have the different refresh rate, it means
  73                  * that the reduced downclock is found. In such
  74                  * case we can set the different FPx0/1 to dynamically select
  75                  * between low and high frequency.
  76                  */
  77                 if (scan->hdisplay == fixed_mode->hdisplay &&
  78                     scan->hsync_start == fixed_mode->hsync_start &&
  79                     scan->hsync_end == fixed_mode->hsync_end &&
  80                     scan->htotal == fixed_mode->htotal &&
  81                     scan->vdisplay == fixed_mode->vdisplay &&
  82                     scan->vsync_start == fixed_mode->vsync_start &&
  83                     scan->vsync_end == fixed_mode->vsync_end &&
  84                     scan->vtotal == fixed_mode->vtotal) {
  85                         if (scan->clock < temp_downclock) {
  86                                 /*
  87                                  * The downclock is already found. But we
  88                                  * expect to find the lower downclock.
  89                                  */
  90                                 temp_downclock = scan->clock;
  91                                 tmp_mode = scan;
  92                         }
  93                 }
  94         }
  95
  96         if (temp_downclock < fixed_mode->clock)
  97                 return drm_mode_duplicate(&dev_priv->drm, tmp_mode);
  98         else
  99                 return NULL;
 100 }
 101
 102 /* adjusted_mode has been preset to be the panel's fixed mode */
 103 void
 104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 105                         struct intel_crtc_state *pipe_config,
 106                         int fitting_mode)
 107 {
 108         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 109         int x = 0, y = 0, width = 0, height = 0;
 110
 111         /* Native modes don't need fitting */
 112         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 113             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 114                 goto done;
 115
 116         switch (fitting_mode) {
 117         case DRM_MODE_SCALE_CENTER:
 118                 width = pipe_config->pipe_src_w;
 119                 height = pipe_config->pipe_src_h;
 120                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 121                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 122                 break;
 123
 124         case DRM_MODE_SCALE_ASPECT:
 125                 /* Scale but preserve the aspect ratio */
 126                 {
 127                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 128                                 * pipe_config->pipe_src_h;
 129                         u32 scaled_height = pipe_config->pipe_src_w
 130                                 * adjusted_mode->crtc_vdisplay;
 131                         if (scaled_width > scaled_height) { /* pillar */
 132                                 width = scaled_height / pipe_config->pipe_src_h;
 133                                 if (width & 1)
 134                                         width++;
 135                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 136                                 y = 0;
 137                                 height = adjusted_mode->crtc_vdisplay;
 138                         } else if (scaled_width < scaled_height) { /* letter */
 139                                 height = scaled_width / pipe_config->pipe_src_w;
 140                                 if (height & 1)
 141                                     height++;
 142                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 143                                 x = 0;
 144                                 width = adjusted_mode->crtc_hdisplay;
 145                         } else {
 146                                 x = y = 0;
 147                                 width = adjusted_mode->crtc_hdisplay;
 148                                 height = adjusted_mode->crtc_vdisplay;
 149                         }
 150                 }
 151                 break;
 152
 153         case DRM_MODE_SCALE_FULLSCREEN:
 154                 x = y = 0;
 155                 width = adjusted_mode->crtc_hdisplay;
 156                 height = adjusted_mode->crtc_vdisplay;
 157                 break;
 158
 159         default:
 160                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 161                 return;
 162         }
 163
 164 done:
 165         pipe_config->pch_pfit.pos = (x << 16) | y;
 166         pipe_config->pch_pfit.size = (width << 16) | height;
 167         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 168 }
 169
 170 static void
 171 centre_horizontally(struct drm_display_mode *adjusted_mode,
 172                     int width)
 173 {
 174         u32 border, sync_pos, blank_width, sync_width;
 175
 176         /* keep the hsync and hblank widths constant */
 177         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 178         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 179         sync_pos = (blank_width - sync_width + 1) / 2;
 180
 181         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 182         border += border & 1; /* make the border even */
 183
 184         adjusted_mode->crtc_hdisplay = width;
 185         adjusted_mode->crtc_hblank_start = width + border;
 186         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 187
 188         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 189         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 190 }
 191
 192 static void
 193 centre_vertically(struct drm_display_mode *adjusted_mode,
 194                   int height)
 195 {
 196         u32 border, sync_pos, blank_width, sync_width;
 197
 198         /* keep the vsync and vblank widths constant */
 199         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 200         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 201         sync_pos = (blank_width - sync_width + 1) / 2;
 202
 203         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 204
 205         adjusted_mode->crtc_vdisplay = height;
 206         adjusted_mode->crtc_vblank_start = height + border;
 207         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 208
 209         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 210         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 211 }
 212
 213 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 214 {
 215         /*
 216          * Floating point operation is not supported. So the FACTOR
 217          * is defined, which can avoid the floating point computation
 218          * when calculating the panel ratio.
 219          */
 220 #define ACCURACY 12
 221 #define FACTOR (1 << ACCURACY)
 222         u32 ratio = source * FACTOR / target;
 223         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 224 }
 225
 226 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 227                               u32 *pfit_control)
 228 {
 229         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 230         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 231                 pipe_config->pipe_src_h;
 232         u32 scaled_height = pipe_config->pipe_src_w *
 233                 adjusted_mode->crtc_vdisplay;
 234
 235         /* 965+ is easy, it does everything in hw */
 236         if (scaled_width > scaled_height)
 237                 *pfit_control |= PFIT_ENABLE |
 238                         PFIT_SCALING_PILLAR;
 239         else if (scaled_width < scaled_height)
 240                 *pfit_control |= PFIT_ENABLE |
 241                         PFIT_SCALING_LETTER;
 242         else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 243                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 244 }
 245
 246 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 247                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 248                               u32 *border)
 249 {
 250         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 251         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 252                 pipe_config->pipe_src_h;
 253         u32 scaled_height = pipe_config->pipe_src_w *
 254                 adjusted_mode->crtc_vdisplay;
 255         u32 bits;
 256
 257         /*
 258          * For earlier chips we have to calculate the scaling
 259          * ratio by hand and program it into the
 260          * PFIT_PGM_RATIO register
 261          */
 262         if (scaled_width > scaled_height) { /* pillar */
 263                 centre_horizontally(adjusted_mode,
 264                                     scaled_height /
 265                                     pipe_config->pipe_src_h);
 266
 267                 *border = LVDS_BORDER_ENABLE;
 268                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 269                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 270                                                     adjusted_mode->crtc_vdisplay);
 271
 272                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 273                                              bits << PFIT_VERT_SCALE_SHIFT);
 274                         *pfit_control |= (PFIT_ENABLE |
 275                                           VERT_INTERP_BILINEAR |
 276                                           HORIZ_INTERP_BILINEAR);
 277                 }
 278         } else if (scaled_width < scaled_height) { /* letter */
 279                 centre_vertically(adjusted_mode,
 280                                   scaled_width /
 281                                   pipe_config->pipe_src_w);
 282
 283                 *border = LVDS_BORDER_ENABLE;
 284                 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 285                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 286                                                     adjusted_mode->crtc_hdisplay);
 287
 288                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 289                                              bits << PFIT_VERT_SCALE_SHIFT);
 290                         *pfit_control |= (PFIT_ENABLE |
 291                                           VERT_INTERP_BILINEAR |
 292                                           HORIZ_INTERP_BILINEAR);
 293                 }
 294         } else {
 295                 /* Aspects match, Let hw scale both directions */
 296                 *pfit_control |= (PFIT_ENABLE |
 297                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 298                                   VERT_INTERP_BILINEAR |
 299                                   HORIZ_INTERP_BILINEAR);
 300         }
 301 }
 302
 303 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 304                               struct intel_crtc_state *pipe_config,
 305                               int fitting_mode)
 306 {
 307         struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
 308         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 309         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 310
 311         /* Native modes don't need fitting */
 312         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 313             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 314                 goto out;
 315
 316         switch (fitting_mode) {
 317         case DRM_MODE_SCALE_CENTER:
 318                 /*
 319                  * For centered modes, we have to calculate border widths &
 320                  * heights and modify the values programmed into the CRTC.
 321                  */
 322                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 323                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 324                 border = LVDS_BORDER_ENABLE;
 325                 break;
 326         case DRM_MODE_SCALE_ASPECT:
 327                 /* Scale but preserve the aspect ratio */
 328                 if (INTEL_GEN(dev_priv) >= 4)
 329                         i965_scale_aspect(pipe_config, &pfit_control);
 330                 else
 331                         i9xx_scale_aspect(pipe_config, &pfit_control,
 332                                           &pfit_pgm_ratios, &border);
 333                 break;
 334         case DRM_MODE_SCALE_FULLSCREEN:
 335                 /*
 336                  * Full scaling, even if it changes the aspect ratio.
 337                  * Fortunately this is all done for us in hw.
 338                  */
 339                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 340                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 341                         pfit_control |= PFIT_ENABLE;
 342                         if (INTEL_GEN(dev_priv) >= 4)
 343                                 pfit_control |= PFIT_SCALING_AUTO;
 344                         else
 345                                 pfit_control |= (VERT_AUTO_SCALE |
 346                                                  VERT_INTERP_BILINEAR |
 347                                                  HORIZ_AUTO_SCALE |
 348                                                  HORIZ_INTERP_BILINEAR);
 349                 }
 350                 break;
 351         default:
 352                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 353                 return;
 354         }
 355
 356         /* 965+ wants fuzzy fitting */
 357         /* FIXME: handle multiple panels by failing gracefully */
 358         if (INTEL_GEN(dev_priv) >= 4)
 359                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 360                                  PFIT_FILTER_FUZZY);
 361
 362 out:
 363         if ((pfit_control & PFIT_ENABLE) == 0) {
 364                 pfit_control = 0;
 365                 pfit_pgm_ratios = 0;
 366         }
 367
 368         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 369         if (INTEL_GEN(dev_priv) < 4 && pipe_config->pipe_bpp == 18)
 370                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 371
 372         pipe_config->gmch_pfit.control = pfit_control;
 373         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 374         pipe_config->gmch_pfit.lvds_border_bits = border;
 375 }
 376
 377 enum drm_connector_status
 378 intel_panel_detect(struct drm_i915_private *dev_priv)
 379 {
 380         /* Assume that the BIOS does not lie through the OpRegion... */
 381         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 382                 return *dev_priv->opregion.lid_state & 0x1 ?
 383                         connector_status_connected :
 384                         connector_status_disconnected;
 385         }
 386
 387         switch (i915.panel_ignore_lid) {
 388         case -2:
 389                 return connector_status_connected;
 390         case -1:
 391                 return connector_status_disconnected;
 392         default:
 393                 return connector_status_unknown;
 394         }
 395 }
 396
 397 /**
 398  * scale - scale values from one range to another
 399  *
 400  * @source_val: value in range [@source_min..@source_max]
 401  *
 402  * Return @source_val in range [@source_min..@source_max] scaled to range
 403  * [@target_min..@target_max].
 404  */
 405 static uint32_t scale(uint32_t source_val,
 406                       uint32_t source_min, uint32_t source_max,
 407                       uint32_t target_min, uint32_t target_max)
 408 {
 409         uint64_t target_val;
 410
 411         WARN_ON(source_min > source_max);
 412         WARN_ON(target_min > target_max);
 413
 414         /* defensive */
 415         source_val = clamp(source_val, source_min, source_max);
 416
 417         /* avoid overflows */
 418         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 419                         (target_max - target_min), source_max - source_min);
 420         target_val += target_min;
 421
 422         return target_val;
 423 }
 424
 425 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 426 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 427                                    u32 user_level, u32 user_max)
 428 {
 429         struct intel_panel *panel = &connector->panel;
 430
 431         return scale(user_level, 0, user_max,
 432                      panel->backlight.min, panel->backlight.max);
 433 }
 434
 435 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 436  * to [hw_min..hw_max]. */
 437 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 438                                    u32 user_level, u32 user_max)
 439 {
 440         struct intel_panel *panel = &connector->panel;
 441         u32 hw_level;
 442
 443         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 444         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 445
 446         return hw_level;
 447 }
 448
 449 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 450 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 451                                    u32 hw_level, u32 user_max)
 452 {
 453         struct intel_panel *panel = &connector->panel;
 454
 455         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 456                      0, user_max);
 457 }
 458
 459 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 460                                           u32 val)
 461 {
 462         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 463         struct intel_panel *panel = &connector->panel;
 464
 465         WARN_ON(panel->backlight.max == 0);
 466
 467         if (i915.invert_brightness < 0)
 468                 return val;
 469
 470         if (i915.invert_brightness > 0 ||
 471             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 472                 return panel->backlight.max - val + panel->backlight.min;
 473         }
 474
 475         return val;
 476 }
 477
 478 static u32 lpt_get_backlight(struct intel_connector *connector)
 479 {
 480         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 481
 482         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 483 }
 484
 485 static u32 pch_get_backlight(struct intel_connector *connector)
 486 {
 487         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 488
 489         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 490 }
 491
 492 static u32 i9xx_get_backlight(struct intel_connector *connector)
 493 {
 494         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 495         struct intel_panel *panel = &connector->panel;
 496         u32 val;
 497
 498         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 499         if (INTEL_INFO(dev_priv)->gen < 4)
 500                 val >>= 1;
 501
 502         if (panel->backlight.combination_mode) {
 503                 u8 lbpc;
 504
 505                 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
 506                 val *= lbpc;
 507         }
 508
 509         return val;
 510 }
 511
 512 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
 513 {
 514         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 515                 return 0;
 516
 517         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 518 }
 519
 520 static u32 vlv_get_backlight(struct intel_connector *connector)
 521 {
 522         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 523         enum pipe pipe = intel_get_pipe_from_connector(connector);
 524
 525         return _vlv_get_backlight(dev_priv, pipe);
 526 }
 527
 528 static u32 bxt_get_backlight(struct intel_connector *connector)
 529 {
 530         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 531         struct intel_panel *panel = &connector->panel;
 532
 533         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 534 }
 535
 536 static u32 pwm_get_backlight(struct intel_connector *connector)
 537 {
 538         struct intel_panel *panel = &connector->panel;
 539         int duty_ns;
 540
 541         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 542         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 543 }
 544
 545 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 546 {
 547         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 548         struct intel_panel *panel = &connector->panel;
 549         u32 val = 0;
 550
 551         mutex_lock(&dev_priv->backlight_lock);
 552
 553         if (panel->backlight.enabled) {
 554                 val = panel->backlight.get(connector);
 555                 val = intel_panel_compute_brightness(connector, val);
 556         }
 557
 558         mutex_unlock(&dev_priv->backlight_lock);
 559
 560         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 561         return val;
 562 }
 563
 564 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 565 {
 566         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 567         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 568
 569         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 570         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 571 }
 572
 573 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 574 {
 575         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 576         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 577         u32 tmp;
 578
 579         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 580         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 581 }
 582
 583 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 584 {
 585         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 586         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 587         struct intel_panel *panel = &connector->panel;
 588         u32 tmp, mask;
 589
 590         WARN_ON(panel->backlight.max == 0);
 591
 592         if (panel->backlight.combination_mode) {
 593                 u8 lbpc;
 594
 595                 lbpc = level * 0xfe / panel->backlight.max + 1;
 596                 level /= lbpc;
 597                 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
 598         }
 599
 600         if (IS_GEN4(dev_priv)) {
 601                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 602         } else {
 603                 level <<= 1;
 604                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 605         }
 606
 607         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 608         I915_WRITE(BLC_PWM_CTL, tmp | level);
 609 }
 610
 611 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 612 {
 613         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 614         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 615         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 616         u32 tmp;
 617
 618         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 619         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 620 }
 621
 622 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 623 {
 624         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 625         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 626         struct intel_panel *panel = &connector->panel;
 627
 628         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 629 }
 630
 631 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 632 {
 633         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 634         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 635
 636         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 637 }
 638
 639 static void
 640 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 641 {
 642         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 643         struct intel_panel *panel = &connector->panel;
 644
 645         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 646
 647         level = intel_panel_compute_brightness(connector, level);
 648         panel->backlight.set(conn_state, level);
 649 }
 650
 651 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 652 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
 653                                       u32 user_level, u32 user_max)
 654 {
 655         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 656         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 657         struct intel_panel *panel = &connector->panel;
 658         u32 hw_level;
 659
 660         if (!panel->backlight.present)
 661                 return;
 662
 663         mutex_lock(&dev_priv->backlight_lock);
 664
 665         WARN_ON(panel->backlight.max == 0);
 666
 667         hw_level = scale_user_to_hw(connector, user_level, user_max);
 668         panel->backlight.level = hw_level;
 669
 670         if (panel->backlight.enabled)
 671                 intel_panel_actually_set_backlight(conn_state, hw_level);
 672
 673         mutex_unlock(&dev_priv->backlight_lock);
 674 }
 675
 676 /* set backlight brightness to level in range [0..max], assuming hw min is
 677  * respected.
 678  */
 679 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 680                                     u32 user_level, u32 user_max)
 681 {
 682         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 683         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 684         struct intel_panel *panel = &connector->panel;
 685         u32 hw_level;
 686
 687         /*
 688          * Lack of crtc may occur during driver init because
 689          * connection_mutex isn't held across the entire backlight
 690          * setup + modeset readout, and the BIOS can issue the
 691          * requests at any time.
 692          */
 693         if (!panel->backlight.present || !conn_state->crtc)
 694                 return;
 695
 696         mutex_lock(&dev_priv->backlight_lock);
 697
 698         WARN_ON(panel->backlight.max == 0);
 699
 700         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 701         panel->backlight.level = hw_level;
 702
 703         if (panel->backlight.device)
 704                 panel->backlight.device->props.brightness =
 705                         scale_hw_to_user(connector,
 706                                          panel->backlight.level,
 707                                          panel->backlight.device->props.max_brightness);
 708
 709         if (panel->backlight.enabled)
 710                 intel_panel_actually_set_backlight(conn_state, hw_level);
 711
 712         mutex_unlock(&dev_priv->backlight_lock);
 713 }
 714
 715 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
 716 {
 717         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 718         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 719         u32 tmp;
 720
 721         intel_panel_actually_set_backlight(old_conn_state, 0);
 722
 723         /*
 724          * Although we don't support or enable CPU PWM with LPT/SPT based
 725          * systems, it may have been enabled prior to loading the
 726          * driver. Disable to avoid warnings on LCPLL disable.
 727          *
 728          * This needs rework if we need to add support for CPU PWM on PCH split
 729          * platforms.
 730          */
 731         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 732         if (tmp & BLM_PWM_ENABLE) {
 733                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
 734                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 735         }
 736
 737         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 738         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 739 }
 740
 741 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
 742 {
 743         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 744         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 745         u32 tmp;
 746
 747         intel_panel_actually_set_backlight(old_conn_state, 0);
 748
 749         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 750         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 751
 752         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 753         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 754 }
 755
 756 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
 757 {
 758         intel_panel_actually_set_backlight(old_conn_state, 0);
 759 }
 760
 761 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
 762 {
 763         struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 764         u32 tmp;
 765
 766         intel_panel_actually_set_backlight(old_conn_state, 0);
 767
 768         tmp = I915_READ(BLC_PWM_CTL2);
 769         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 770 }
 771
 772 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
 773 {
 774         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 775         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 776         enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 777         u32 tmp;
 778
 779         intel_panel_actually_set_backlight(old_conn_state, 0);
 780
 781         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 782         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 783 }
 784
 785 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
 786 {
 787         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 788         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 789         struct intel_panel *panel = &connector->panel;
 790         u32 tmp, val;
 791
 792         intel_panel_actually_set_backlight(old_conn_state, 0);
 793
 794         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 795         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 796                         tmp & ~BXT_BLC_PWM_ENABLE);
 797
 798         if (panel->backlight.controller == 1) {
 799                 val = I915_READ(UTIL_PIN_CTL);
 800                 val &= ~UTIL_PIN_ENABLE;
 801                 I915_WRITE(UTIL_PIN_CTL, val);
 802         }
 803 }
 804
 805 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
 806 {
 807         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 808         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 809         struct intel_panel *panel = &connector->panel;
 810         u32 tmp;
 811
 812         intel_panel_actually_set_backlight(old_conn_state, 0);
 813
 814         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 815         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 816                    tmp & ~BXT_BLC_PWM_ENABLE);
 817 }
 818
 819 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
 820 {
 821         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 822         struct intel_panel *panel = &connector->panel;
 823
 824         /* Disable the backlight */
 825         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 826         usleep_range(2000, 3000);
 827         pwm_disable(panel->backlight.pwm);
 828 }
 829
 830 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
 831 {
 832         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 833         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 834         struct intel_panel *panel = &connector->panel;
 835
 836         if (!panel->backlight.present)
 837                 return;
 838
 839         /*
 840          * Do not disable backlight on the vga_switcheroo path. When switching
 841          * away from i915, the other client may depend on i915 to handle the
 842          * backlight. This will leave the backlight on unnecessarily when
 843          * another client is not activated.
 844          */
 845         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 846                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 847                 return;
 848         }
 849
 850         mutex_lock(&dev_priv->backlight_lock);
 851
 852         if (panel->backlight.device)
 853                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 854         panel->backlight.enabled = false;
 855         panel->backlight.disable(old_conn_state);
 856
 857         mutex_unlock(&dev_priv->backlight_lock);
 858 }
 859
 860 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 861                                  const struct drm_connector_state *conn_state)
 862 {
 863         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 864         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 865         struct intel_panel *panel = &connector->panel;
 866         u32 pch_ctl1, pch_ctl2, schicken;
 867
 868         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 869         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 870                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 871                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 872                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 873         }
 874
 875         if (HAS_PCH_LPT(dev_priv)) {
 876                 schicken = I915_READ(SOUTH_CHICKEN2);
 877                 if (panel->backlight.alternate_pwm_increment)
 878                         schicken |= LPT_PWM_GRANULARITY;
 879                 else
 880                         schicken &= ~LPT_PWM_GRANULARITY;
 881                 I915_WRITE(SOUTH_CHICKEN2, schicken);
 882         } else {
 883                 schicken = I915_READ(SOUTH_CHICKEN1);
 884                 if (panel->backlight.alternate_pwm_increment)
 885                         schicken |= SPT_PWM_GRANULARITY;
 886                 else
 887                         schicken &= ~SPT_PWM_GRANULARITY;
 888                 I915_WRITE(SOUTH_CHICKEN1, schicken);
 889         }
 890
 891         pch_ctl2 = panel->backlight.max << 16;
 892         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 893
 894         pch_ctl1 = 0;
 895         if (panel->backlight.active_low_pwm)
 896                 pch_ctl1 |= BLM_PCH_POLARITY;
 897
 898         /* After LPT, override is the default. */
 899         if (HAS_PCH_LPT(dev_priv))
 900                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 901
 902         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 903         POSTING_READ(BLC_PWM_PCH_CTL1);
 904         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 905
 906         /* This won't stick until the above enable. */
 907         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 908 }
 909
 910 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 911                                  const struct drm_connector_state *conn_state)
 912 {
 913         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 914         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 915         struct intel_panel *panel = &connector->panel;
 916         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 917         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 918
 919         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 920         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 921                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 922                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 923                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 924         }
 925
 926         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 927         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 928                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 929                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 930                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 931         }
 932
 933         if (cpu_transcoder == TRANSCODER_EDP)
 934                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 935         else
 936                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 937         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 938         POSTING_READ(BLC_PWM_CPU_CTL2);
 939         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 940
 941         /* This won't stick until the above enable. */
 942         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 943
 944         pch_ctl2 = panel->backlight.max << 16;
 945         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 946
 947         pch_ctl1 = 0;
 948         if (panel->backlight.active_low_pwm)
 949                 pch_ctl1 |= BLM_PCH_POLARITY;
 950
 951         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 952         POSTING_READ(BLC_PWM_PCH_CTL1);
 953         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 954 }
 955
 956 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
 957                                   const struct drm_connector_state *conn_state)
 958 {
 959         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 960         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 961         struct intel_panel *panel = &connector->panel;
 962         u32 ctl, freq;
 963
 964         ctl = I915_READ(BLC_PWM_CTL);
 965         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 966                 DRM_DEBUG_KMS("backlight already enabled\n");
 967                 I915_WRITE(BLC_PWM_CTL, 0);
 968         }
 969
 970         freq = panel->backlight.max;
 971         if (panel->backlight.combination_mode)
 972                 freq /= 0xff;
 973
 974         ctl = freq << 17;
 975         if (panel->backlight.combination_mode)
 976                 ctl |= BLM_LEGACY_MODE;
 977         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
 978                 ctl |= BLM_POLARITY_PNV;
 979
 980         I915_WRITE(BLC_PWM_CTL, ctl);
 981         POSTING_READ(BLC_PWM_CTL);
 982
 983         /* XXX: combine this into above write? */
 984         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 985
 986         /*
 987          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 988          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 989          * that has backlight.
 990          */
 991         if (IS_GEN2(dev_priv))
 992                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 993 }
 994
 995 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
 996                                   const struct drm_connector_state *conn_state)
 997 {
 998         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 999         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1000         struct intel_panel *panel = &connector->panel;
1001         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1002         u32 ctl, ctl2, freq;
1003
1004         ctl2 = I915_READ(BLC_PWM_CTL2);
1005         if (ctl2 & BLM_PWM_ENABLE) {
1006                 DRM_DEBUG_KMS("backlight already enabled\n");
1007                 ctl2 &= ~BLM_PWM_ENABLE;
1008                 I915_WRITE(BLC_PWM_CTL2, ctl2);
1009         }
1010
1011         freq = panel->backlight.max;
1012         if (panel->backlight.combination_mode)
1013                 freq /= 0xff;
1014
1015         ctl = freq << 16;
1016         I915_WRITE(BLC_PWM_CTL, ctl);
1017
1018         ctl2 = BLM_PIPE(pipe);
1019         if (panel->backlight.combination_mode)
1020                 ctl2 |= BLM_COMBINATION_MODE;
1021         if (panel->backlight.active_low_pwm)
1022                 ctl2 |= BLM_POLARITY_I965;
1023         I915_WRITE(BLC_PWM_CTL2, ctl2);
1024         POSTING_READ(BLC_PWM_CTL2);
1025         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1026
1027         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1028 }
1029
1030 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1031                                  const struct drm_connector_state *conn_state)
1032 {
1033         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1034         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1035         struct intel_panel *panel = &connector->panel;
1036         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1037         u32 ctl, ctl2;
1038
1039         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1040         if (ctl2 & BLM_PWM_ENABLE) {
1041                 DRM_DEBUG_KMS("backlight already enabled\n");
1042                 ctl2 &= ~BLM_PWM_ENABLE;
1043                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1044         }
1045
1046         ctl = panel->backlight.max << 16;
1047         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1048
1049         /* XXX: combine this into above write? */
1050         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1051
1052         ctl2 = 0;
1053         if (panel->backlight.active_low_pwm)
1054                 ctl2 |= BLM_POLARITY_I965;
1055         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1056         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1057         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1058 }
1059
1060 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1061                                  const struct drm_connector_state *conn_state)
1062 {
1063         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1064         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1065         struct intel_panel *panel = &connector->panel;
1066         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1067         u32 pwm_ctl, val;
1068
1069         /* Controller 1 uses the utility pin. */
1070         if (panel->backlight.controller == 1) {
1071                 val = I915_READ(UTIL_PIN_CTL);
1072                 if (val & UTIL_PIN_ENABLE) {
1073                         DRM_DEBUG_KMS("util pin already enabled\n");
1074                         val &= ~UTIL_PIN_ENABLE;
1075                         I915_WRITE(UTIL_PIN_CTL, val);
1076                 }
1077
1078                 val = 0;
1079                 if (panel->backlight.util_pin_active_low)
1080                         val |= UTIL_PIN_POLARITY;
1081                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1082                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1083         }
1084
1085         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1086         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1087                 DRM_DEBUG_KMS("backlight already enabled\n");
1088                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1089                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1090                                 pwm_ctl);
1091         }
1092
1093         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1094                         panel->backlight.max);
1095
1096         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1097
1098         pwm_ctl = 0;
1099         if (panel->backlight.active_low_pwm)
1100                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1101
1102         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1103         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1104         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1105                         pwm_ctl | BXT_BLC_PWM_ENABLE);
1106 }
1107
1108 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1109                                  const struct drm_connector_state *conn_state)
1110 {
1111         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1112         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1113         struct intel_panel *panel = &connector->panel;
1114         u32 pwm_ctl;
1115
1116         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1117         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1118                 DRM_DEBUG_KMS("backlight already enabled\n");
1119                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1120                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1121                            pwm_ctl);
1122         }
1123
1124         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1125                    panel->backlight.max);
1126
1127         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1128
1129         pwm_ctl = 0;
1130         if (panel->backlight.active_low_pwm)
1131                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1132
1133         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1134         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1135         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1136                    pwm_ctl | BXT_BLC_PWM_ENABLE);
1137 }
1138
1139 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1140                                  const struct drm_connector_state *conn_state)
1141 {
1142         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1143         struct intel_panel *panel = &connector->panel;
1144
1145         pwm_enable(panel->backlight.pwm);
1146         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1147 }
1148
1149 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1150                                   const struct drm_connector_state *conn_state)
1151 {
1152         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1153         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1154         struct intel_panel *panel = &connector->panel;
1155         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1156
1157         if (!panel->backlight.present)
1158                 return;
1159
1160         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1161
1162         mutex_lock(&dev_priv->backlight_lock);
1163
1164         WARN_ON(panel->backlight.max == 0);
1165
1166         if (panel->backlight.level <= panel->backlight.min) {
1167                 panel->backlight.level = panel->backlight.max;
1168                 if (panel->backlight.device)
1169                         panel->backlight.device->props.brightness =
1170                                 scale_hw_to_user(connector,
1171                                                  panel->backlight.level,
1172                                                  panel->backlight.device->props.max_brightness);
1173         }
1174
1175         panel->backlight.enable(crtc_state, conn_state);
1176         panel->backlight.enabled = true;
1177         if (panel->backlight.device)
1178                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1179
1180         mutex_unlock(&dev_priv->backlight_lock);
1181 }
1182
1183 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1184 static int intel_backlight_device_update_status(struct backlight_device *bd)
1185 {
1186         struct intel_connector *connector = bl_get_data(bd);
1187         struct intel_panel *panel = &connector->panel;
1188         struct drm_device *dev = connector->base.dev;
1189
1190         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1191         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1192                       bd->props.brightness, bd->props.max_brightness);
1193         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1194                                   bd->props.max_brightness);
1195
1196         /*
1197          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1198          * backlight class device does not make it easy to to differentiate
1199          * between callbacks for brightness and bl_power, so our backlight_power
1200          * callback needs to take this into account.
1201          */
1202         if (panel->backlight.enabled) {
1203                 if (panel->backlight.power) {
1204                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1205                                 bd->props.brightness != 0;
1206                         panel->backlight.power(connector, enable);
1207                 }
1208         } else {
1209                 bd->props.power = FB_BLANK_POWERDOWN;
1210         }
1211
1212         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1213         return 0;
1214 }
1215
1216 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1217 {
1218         struct intel_connector *connector = bl_get_data(bd);
1219         struct drm_device *dev = connector->base.dev;
1220         struct drm_i915_private *dev_priv = to_i915(dev);
1221         u32 hw_level;
1222         int ret;
1223
1224         intel_runtime_pm_get(dev_priv);
1225         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1226
1227         hw_level = intel_panel_get_backlight(connector);
1228         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1229
1230         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1231         intel_runtime_pm_put(dev_priv);
1232
1233         return ret;
1234 }
1235
1236 static const struct backlight_ops intel_backlight_device_ops = {
1237         .update_status = intel_backlight_device_update_status,
1238         .get_brightness = intel_backlight_device_get_brightness,
1239 };
1240
1241 int intel_backlight_device_register(struct intel_connector *connector)
1242 {
1243         struct intel_panel *panel = &connector->panel;
1244         struct backlight_properties props;
1245
1246         if (WARN_ON(panel->backlight.device))
1247                 return -ENODEV;
1248
1249         if (!panel->backlight.present)
1250                 return 0;
1251
1252         WARN_ON(panel->backlight.max == 0);
1253
1254         memset(&props, 0, sizeof(props));
1255         props.type = BACKLIGHT_RAW;
1256
1257         /*
1258          * Note: Everything should work even if the backlight device max
1259          * presented to the userspace is arbitrarily chosen.
1260          */
1261         props.max_brightness = panel->backlight.max;
1262         props.brightness = scale_hw_to_user(connector,
1263                                             panel->backlight.level,
1264                                             props.max_brightness);
1265
1266         if (panel->backlight.enabled)
1267                 props.power = FB_BLANK_UNBLANK;
1268         else
1269                 props.power = FB_BLANK_POWERDOWN;
1270
1271         /*
1272          * Note: using the same name independent of the connector prevents
1273          * registration of multiple backlight devices in the driver.
1274          */
1275         panel->backlight.device =
1276                 backlight_device_register("intel_backlight",
1277                                           connector->base.kdev,
1278                                           connector,
1279                                           &intel_backlight_device_ops, &props);
1280
1281         if (IS_ERR(panel->backlight.device)) {
1282                 DRM_ERROR("Failed to register backlight: %ld\n",
1283                           PTR_ERR(panel->backlight.device));
1284                 panel->backlight.device = NULL;
1285                 return -ENODEV;
1286         }
1287
1288         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1289                       connector->base.name);
1290
1291         return 0;
1292 }
1293
1294 void intel_backlight_device_unregister(struct intel_connector *connector)
1295 {
1296         struct intel_panel *panel = &connector->panel;
1297
1298         if (panel->backlight.device) {
1299                 backlight_device_unregister(panel->backlight.device);
1300                 panel->backlight.device = NULL;
1301         }
1302 }
1303 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1304
1305 /*
1306  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1307  *      PWM increment = 1
1308  */
1309 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1310 {
1311         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1312
1313         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1314 }
1315
1316 /*
1317  * BXT: PWM clock frequency = 19.2 MHz.
1318  */
1319 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1320 {
1321         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1322 }
1323
1324 /*
1325  * SPT: This value represents the period of the PWM stream in clock periods
1326  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1327  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1328  */
1329 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1330 {
1331         struct intel_panel *panel = &connector->panel;
1332         u32 mul;
1333
1334         if (panel->backlight.alternate_pwm_increment)
1335                 mul = 128;
1336         else
1337                 mul = 16;
1338
1339         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1340 }
1341
1342 /*
1343  * LPT: This value represents the period of the PWM stream in clock periods
1344  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1345  * LPT SOUTH_CHICKEN2 register bit 5).
1346  */
1347 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1348 {
1349         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1350         struct intel_panel *panel = &connector->panel;
1351         u32 mul, clock;
1352
1353         if (panel->backlight.alternate_pwm_increment)
1354                 mul = 16;
1355         else
1356                 mul = 128;
1357
1358         if (HAS_PCH_LPT_H(dev_priv))
1359                 clock = MHz(135); /* LPT:H */
1360         else
1361                 clock = MHz(24); /* LPT:LP */
1362
1363         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1364 }
1365
1366 /*
1367  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1368  * display raw clocks multiplied by 128.
1369  */
1370 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1371 {
1372         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1373
1374         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1375 }
1376
1377 /*
1378  * Gen2: This field determines the number of time base events (display core
1379  * clock frequency/32) in total for a complete cycle of modulated backlight
1380  * control.
1381  *
1382  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1383  * divided by 32.
1384  */
1385 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1386 {
1387         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1388         int clock;
1389
1390         if (IS_PINEVIEW(dev_priv))
1391                 clock = KHz(dev_priv->rawclk_freq);
1392         else
1393                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1394
1395         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1396 }
1397
1398 /*
1399  * Gen4: This value represents the period of the PWM stream in display core
1400  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1401  *
1402  */
1403 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1404 {
1405         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1406         int clock;
1407
1408         if (IS_G4X(dev_priv))
1409                 clock = KHz(dev_priv->rawclk_freq);
1410         else
1411                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1412
1413         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1414 }
1415
1416 /*
1417  * VLV: This value represents the period of the PWM stream in display core
1418  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1419  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1420  */
1421 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1422 {
1423         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1424         int mul, clock;
1425
1426         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1427                 if (IS_CHERRYVIEW(dev_priv))
1428                         clock = KHz(19200);
1429                 else
1430                         clock = MHz(25);
1431                 mul = 16;
1432         } else {
1433                 clock = KHz(dev_priv->rawclk_freq);
1434                 mul = 128;
1435         }
1436
1437         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1438 }
1439
1440 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1441 {
1442         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1443         struct intel_panel *panel = &connector->panel;
1444         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1445         u32 pwm;
1446
1447         if (!panel->backlight.hz_to_pwm) {
1448                 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1449                 return 0;
1450         }
1451
1452         if (pwm_freq_hz) {
1453                 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1454                               pwm_freq_hz);
1455         } else {
1456                 pwm_freq_hz = 200;
1457                 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1458                               pwm_freq_hz);
1459         }
1460
1461         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1462         if (!pwm) {
1463                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1464                 return 0;
1465         }
1466
1467         return pwm;
1468 }
1469
1470 /*
1471  * Note: The setup hooks can't assume pipe is set!
1472  */
1473 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1474 {
1475         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1476         struct intel_panel *panel = &connector->panel;
1477         int min;
1478
1479         WARN_ON(panel->backlight.max == 0);
1480
1481         /*
1482          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1483          * to problems. There are such machines out there. Either our
1484          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1485          * against this by letting the minimum be at most (arbitrarily chosen)
1486          * 25% of the max.
1487          */
1488         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1489         if (min != dev_priv->vbt.backlight.min_brightness) {
1490                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1491                               dev_priv->vbt.backlight.min_brightness, min);
1492         }
1493
1494         /* vbt value is a coefficient in range [0..255] */
1495         return scale(min, 0, 255, 0, panel->backlight.max);
1496 }
1497
1498 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1499 {
1500         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1501         struct intel_panel *panel = &connector->panel;
1502         u32 pch_ctl1, pch_ctl2, val;
1503         bool alt;
1504
1505         if (HAS_PCH_LPT(dev_priv))
1506                 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1507         else
1508                 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1509         panel->backlight.alternate_pwm_increment = alt;
1510
1511         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1512         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1513
1514         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1515         panel->backlight.max = pch_ctl2 >> 16;
1516
1517         if (!panel->backlight.max)
1518                 panel->backlight.max = get_backlight_max_vbt(connector);
1519
1520         if (!panel->backlight.max)
1521                 return -ENODEV;
1522
1523         panel->backlight.min = get_backlight_min_vbt(connector);
1524
1525         val = lpt_get_backlight(connector);
1526         val = intel_panel_compute_brightness(connector, val);
1527         panel->backlight.level = clamp(val, panel->backlight.min,
1528                                        panel->backlight.max);
1529
1530         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1531
1532         return 0;
1533 }
1534
1535 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1536 {
1537         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1538         struct intel_panel *panel = &connector->panel;
1539         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1540
1541         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1542         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1543
1544         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1545         panel->backlight.max = pch_ctl2 >> 16;
1546
1547         if (!panel->backlight.max)
1548                 panel->backlight.max = get_backlight_max_vbt(connector);
1549
1550         if (!panel->backlight.max)
1551                 return -ENODEV;
1552
1553         panel->backlight.min = get_backlight_min_vbt(connector);
1554
1555         val = pch_get_backlight(connector);
1556         val = intel_panel_compute_brightness(connector, val);
1557         panel->backlight.level = clamp(val, panel->backlight.min,
1558                                        panel->backlight.max);
1559
1560         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1561         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1562                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1563
1564         return 0;
1565 }
1566
1567 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1568 {
1569         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1570         struct intel_panel *panel = &connector->panel;
1571         u32 ctl, val;
1572
1573         ctl = I915_READ(BLC_PWM_CTL);
1574
1575         if (IS_GEN2(dev_priv) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1576                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1577
1578         if (IS_PINEVIEW(dev_priv))
1579                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1580
1581         panel->backlight.max = ctl >> 17;
1582
1583         if (!panel->backlight.max) {
1584                 panel->backlight.max = get_backlight_max_vbt(connector);
1585                 panel->backlight.max >>= 1;
1586         }
1587
1588         if (!panel->backlight.max)
1589                 return -ENODEV;
1590
1591         if (panel->backlight.combination_mode)
1592                 panel->backlight.max *= 0xff;
1593
1594         panel->backlight.min = get_backlight_min_vbt(connector);
1595
1596         val = i9xx_get_backlight(connector);
1597         val = intel_panel_compute_brightness(connector, val);
1598         panel->backlight.level = clamp(val, panel->backlight.min,
1599                                        panel->backlight.max);
1600
1601         panel->backlight.enabled = val != 0;
1602
1603         return 0;
1604 }
1605
1606 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1607 {
1608         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1609         struct intel_panel *panel = &connector->panel;
1610         u32 ctl, ctl2, val;
1611
1612         ctl2 = I915_READ(BLC_PWM_CTL2);
1613         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1614         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1615
1616         ctl = I915_READ(BLC_PWM_CTL);
1617         panel->backlight.max = ctl >> 16;
1618
1619         if (!panel->backlight.max)
1620                 panel->backlight.max = get_backlight_max_vbt(connector);
1621
1622         if (!panel->backlight.max)
1623                 return -ENODEV;
1624
1625         if (panel->backlight.combination_mode)
1626                 panel->backlight.max *= 0xff;
1627
1628         panel->backlight.min = get_backlight_min_vbt(connector);
1629
1630         val = i9xx_get_backlight(connector);
1631         val = intel_panel_compute_brightness(connector, val);
1632         panel->backlight.level = clamp(val, panel->backlight.min,
1633                                        panel->backlight.max);
1634
1635         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1636
1637         return 0;
1638 }
1639
1640 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1641 {
1642         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1643         struct intel_panel *panel = &connector->panel;
1644         u32 ctl, ctl2, val;
1645
1646         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1647                 return -ENODEV;
1648
1649         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1650         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1651
1652         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1653         panel->backlight.max = ctl >> 16;
1654
1655         if (!panel->backlight.max)
1656                 panel->backlight.max = get_backlight_max_vbt(connector);
1657
1658         if (!panel->backlight.max)
1659                 return -ENODEV;
1660
1661         panel->backlight.min = get_backlight_min_vbt(connector);
1662
1663         val = _vlv_get_backlight(dev_priv, pipe);
1664         val = intel_panel_compute_brightness(connector, val);
1665         panel->backlight.level = clamp(val, panel->backlight.min,
1666                                        panel->backlight.max);
1667
1668         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1669
1670         return 0;
1671 }
1672
1673 static int
1674 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1675 {
1676         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1677         struct intel_panel *panel = &connector->panel;
1678         u32 pwm_ctl, val;
1679
1680         panel->backlight.controller = dev_priv->vbt.backlight.controller;
1681
1682         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1683
1684         /* Controller 1 uses the utility pin. */
1685         if (panel->backlight.controller == 1) {
1686                 val = I915_READ(UTIL_PIN_CTL);
1687                 panel->backlight.util_pin_active_low =
1688                                         val & UTIL_PIN_POLARITY;
1689         }
1690
1691         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1692         panel->backlight.max =
1693                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1694
1695         if (!panel->backlight.max)
1696                 panel->backlight.max = get_backlight_max_vbt(connector);
1697
1698         if (!panel->backlight.max)
1699                 return -ENODEV;
1700
1701         val = bxt_get_backlight(connector);
1702         val = intel_panel_compute_brightness(connector, val);
1703         panel->backlight.level = clamp(val, panel->backlight.min,
1704                                        panel->backlight.max);
1705
1706         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1707
1708         return 0;
1709 }
1710
1711 static int
1712 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1713 {
1714         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1715         struct intel_panel *panel = &connector->panel;
1716         u32 pwm_ctl, val;
1717
1718         /*
1719          * CNP has the BXT implementation of backlight, but with only
1720          * one controller. Future platforms could have multiple controllers
1721          * so let's make this extensible and prepared for the future.
1722          */
1723         panel->backlight.controller = 0;
1724
1725         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1726
1727         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1728         panel->backlight.max =
1729                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1730
1731         if (!panel->backlight.max)
1732                 panel->backlight.max = get_backlight_max_vbt(connector);
1733
1734         if (!panel->backlight.max)
1735                 return -ENODEV;
1736
1737         val = bxt_get_backlight(connector);
1738         val = intel_panel_compute_brightness(connector, val);
1739         panel->backlight.level = clamp(val, panel->backlight.min,
1740                                        panel->backlight.max);
1741
1742         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1743
1744         return 0;
1745 }
1746
1747 static int pwm_setup_backlight(struct intel_connector *connector,
1748                                enum pipe pipe)
1749 {
1750         struct drm_device *dev = connector->base.dev;
1751         struct intel_panel *panel = &connector->panel;
1752         int retval;
1753
1754         /* Get the PWM chip for backlight control */
1755         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1756         if (IS_ERR(panel->backlight.pwm)) {
1757                 DRM_ERROR("Failed to own the pwm chip\n");
1758                 panel->backlight.pwm = NULL;
1759                 return -ENODEV;
1760         }
1761
1762         /*
1763          * FIXME: pwm_apply_args() should be removed when switching to
1764          * the atomic PWM API.
1765          */
1766         pwm_apply_args(panel->backlight.pwm);
1767
1768         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1769                             CRC_PMIC_PWM_PERIOD_NS);
1770         if (retval < 0) {
1771                 DRM_ERROR("Failed to configure the pwm chip\n");
1772                 pwm_put(panel->backlight.pwm);
1773                 panel->backlight.pwm = NULL;
1774                 return retval;
1775         }
1776
1777         panel->backlight.min = 0; /* 0% */
1778         panel->backlight.max = 100; /* 100% */
1779         panel->backlight.level = DIV_ROUND_UP(
1780                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1781                                  CRC_PMIC_PWM_PERIOD_NS);
1782         panel->backlight.enabled = panel->backlight.level != 0;
1783
1784         return 0;
1785 }
1786
1787 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1788 {
1789         struct drm_i915_private *dev_priv = to_i915(connector->dev);
1790         struct intel_connector *intel_connector = to_intel_connector(connector);
1791         struct intel_panel *panel = &intel_connector->panel;
1792         int ret;
1793
1794         if (!dev_priv->vbt.backlight.present) {
1795                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1796                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1797                 } else {
1798                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1799                         return 0;
1800                 }
1801         }
1802
1803         /* ensure intel_panel has been initialized first */
1804         if (WARN_ON(!panel->backlight.setup))
1805                 return -ENODEV;
1806
1807         /* set level and max in panel struct */
1808         mutex_lock(&dev_priv->backlight_lock);
1809         ret = panel->backlight.setup(intel_connector, pipe);
1810         mutex_unlock(&dev_priv->backlight_lock);
1811
1812         if (ret) {
1813                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1814                               connector->name);
1815                 return ret;
1816         }
1817
1818         panel->backlight.present = true;
1819
1820         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1821                       connector->name,
1822                       enableddisabled(panel->backlight.enabled),
1823                       panel->backlight.level, panel->backlight.max);
1824
1825         return 0;
1826 }
1827
1828 void intel_panel_destroy_backlight(struct drm_connector *connector)
1829 {
1830         struct intel_connector *intel_connector = to_intel_connector(connector);
1831         struct intel_panel *panel = &intel_connector->panel;
1832
1833         /* dispose of the pwm */
1834         if (panel->backlight.pwm)
1835                 pwm_put(panel->backlight.pwm);
1836
1837         panel->backlight.present = false;
1838 }
1839
1840 /* Set up chip specific backlight functions */
1841 static void
1842 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1843 {
1844         struct intel_connector *connector =
1845                 container_of(panel, struct intel_connector, panel);
1846         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1847
1848         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1849             intel_dp_aux_init_backlight_funcs(connector) == 0)
1850                 return;
1851
1852         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1853             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1854                 return;
1855
1856         if (IS_GEN9_LP(dev_priv)) {
1857                 panel->backlight.setup = bxt_setup_backlight;
1858                 panel->backlight.enable = bxt_enable_backlight;
1859                 panel->backlight.disable = bxt_disable_backlight;
1860                 panel->backlight.set = bxt_set_backlight;
1861                 panel->backlight.get = bxt_get_backlight;
1862                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1863         } else if (HAS_PCH_CNP(dev_priv)) {
1864                 panel->backlight.setup = cnp_setup_backlight;
1865                 panel->backlight.enable = cnp_enable_backlight;
1866                 panel->backlight.disable = cnp_disable_backlight;
1867                 panel->backlight.set = bxt_set_backlight;
1868                 panel->backlight.get = bxt_get_backlight;
1869                 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1870         } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
1871                    HAS_PCH_KBP(dev_priv)) {
1872                 panel->backlight.setup = lpt_setup_backlight;
1873                 panel->backlight.enable = lpt_enable_backlight;
1874                 panel->backlight.disable = lpt_disable_backlight;
1875                 panel->backlight.set = lpt_set_backlight;
1876                 panel->backlight.get = lpt_get_backlight;
1877                 if (HAS_PCH_LPT(dev_priv))
1878                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1879                 else
1880                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1881         } else if (HAS_PCH_SPLIT(dev_priv)) {
1882                 panel->backlight.setup = pch_setup_backlight;
1883                 panel->backlight.enable = pch_enable_backlight;
1884                 panel->backlight.disable = pch_disable_backlight;
1885                 panel->backlight.set = pch_set_backlight;
1886                 panel->backlight.get = pch_get_backlight;
1887                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1888         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1889                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1890                         panel->backlight.setup = pwm_setup_backlight;
1891                         panel->backlight.enable = pwm_enable_backlight;
1892                         panel->backlight.disable = pwm_disable_backlight;
1893                         panel->backlight.set = pwm_set_backlight;
1894                         panel->backlight.get = pwm_get_backlight;
1895                 } else {
1896                         panel->backlight.setup = vlv_setup_backlight;
1897                         panel->backlight.enable = vlv_enable_backlight;
1898                         panel->backlight.disable = vlv_disable_backlight;
1899                         panel->backlight.set = vlv_set_backlight;
1900                         panel->backlight.get = vlv_get_backlight;
1901                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1902                 }
1903         } else if (IS_GEN4(dev_priv)) {
1904                 panel->backlight.setup = i965_setup_backlight;
1905                 panel->backlight.enable = i965_enable_backlight;
1906                 panel->backlight.disable = i965_disable_backlight;
1907                 panel->backlight.set = i9xx_set_backlight;
1908                 panel->backlight.get = i9xx_get_backlight;
1909                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1910         } else {
1911                 panel->backlight.setup = i9xx_setup_backlight;
1912                 panel->backlight.enable = i9xx_enable_backlight;
1913                 panel->backlight.disable = i9xx_disable_backlight;
1914                 panel->backlight.set = i9xx_set_backlight;
1915                 panel->backlight.get = i9xx_get_backlight;
1916                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1917         }
1918 }
1919
1920 int intel_panel_init(struct intel_panel *panel,
1921                      struct drm_display_mode *fixed_mode,
1922                      struct drm_display_mode *downclock_mode)
1923 {
1924         intel_panel_init_backlight_funcs(panel);
1925
1926         panel->fixed_mode = fixed_mode;
1927         panel->downclock_mode = downclock_mode;
1928
1929         return 0;
1930 }
1931
1932 void intel_panel_fini(struct intel_panel *panel)
1933 {
1934         struct intel_connector *intel_connector =
1935                 container_of(panel, struct intel_connector, panel);
1936
1937         if (panel->fixed_mode)
1938                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1939
1940         if (panel->downclock_mode)
1941                 drm_mode_destroy(intel_connector->base.dev,
1942                                 panel->downclock_mode);
1943 }