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 #include <linux/kernel.h>
  32 #include <linux/moduleparam.h>
  33 #include <linux/pwm.h>
  34 #include "intel_drv.h"
  35
  36 #define CRC_PMIC_PWM_PERIOD_NS  21333
  37
  38 void
  39 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  40                        struct drm_display_mode *adjusted_mode)
  41 {
  42         drm_mode_copy(adjusted_mode, fixed_mode);
  43
  44         drm_mode_set_crtcinfo(adjusted_mode, 0);
  45 }
  46
  47 /**
  48  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  49  * @dev: drm device
  50  * @fixed_mode : panel native mode
  51  * @connector: LVDS/eDP connector
  52  *
  53  * Return downclock_avail
  54  * Find the reduced downclock for LVDS/eDP in EDID.
  55  */
  56 struct drm_display_mode *
  57 intel_find_panel_downclock(struct drm_device *dev,
  58                         struct drm_display_mode *fixed_mode,
  59                         struct drm_connector *connector)
  60 {
  61         struct drm_display_mode *scan, *tmp_mode;
  62         int temp_downclock;
  63
  64         temp_downclock = fixed_mode->clock;
  65         tmp_mode = NULL;
  66
  67         list_for_each_entry(scan, &connector->probed_modes, head) {
  68                 /*
  69                  * If one mode has the same resolution with the fixed_panel
  70                  * mode while they have the different refresh rate, it means
  71                  * that the reduced downclock is found. In such
  72                  * case we can set the different FPx0/1 to dynamically select
  73                  * between low and high frequency.
  74                  */
  75                 if (scan->hdisplay == fixed_mode->hdisplay &&
  76                     scan->hsync_start == fixed_mode->hsync_start &&
  77                     scan->hsync_end == fixed_mode->hsync_end &&
  78                     scan->htotal == fixed_mode->htotal &&
  79                     scan->vdisplay == fixed_mode->vdisplay &&
  80                     scan->vsync_start == fixed_mode->vsync_start &&
  81                     scan->vsync_end == fixed_mode->vsync_end &&
  82                     scan->vtotal == fixed_mode->vtotal) {
  83                         if (scan->clock < temp_downclock) {
  84                                 /*
  85                                  * The downclock is already found. But we
  86                                  * expect to find the lower downclock.
  87                                  */
  88                                 temp_downclock = scan->clock;
  89                                 tmp_mode = scan;
  90                         }
  91                 }
  92         }
  93
  94         if (temp_downclock < fixed_mode->clock)
  95                 return drm_mode_duplicate(dev, tmp_mode);
  96         else
  97                 return NULL;
  98 }
  99
 100 /* adjusted_mode has been preset to be the panel's fixed mode */
 101 void
 102 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 103                         struct intel_crtc_state *pipe_config,
 104                         int fitting_mode)
 105 {
 106         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 107         int x = 0, y = 0, width = 0, height = 0;
 108
 109         /* Native modes don't need fitting */
 110         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 111             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 112                 goto done;
 113
 114         switch (fitting_mode) {
 115         case DRM_MODE_SCALE_CENTER:
 116                 width = pipe_config->pipe_src_w;
 117                 height = pipe_config->pipe_src_h;
 118                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 119                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 120                 break;
 121
 122         case DRM_MODE_SCALE_ASPECT:
 123                 /* Scale but preserve the aspect ratio */
 124                 {
 125                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 126                                 * pipe_config->pipe_src_h;
 127                         u32 scaled_height = pipe_config->pipe_src_w
 128                                 * adjusted_mode->crtc_vdisplay;
 129                         if (scaled_width > scaled_height) { /* pillar */
 130                                 width = scaled_height / pipe_config->pipe_src_h;
 131                                 if (width & 1)
 132                                         width++;
 133                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 134                                 y = 0;
 135                                 height = adjusted_mode->crtc_vdisplay;
 136                         } else if (scaled_width < scaled_height) { /* letter */
 137                                 height = scaled_width / pipe_config->pipe_src_w;
 138                                 if (height & 1)
 139                                     height++;
 140                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 141                                 x = 0;
 142                                 width = adjusted_mode->crtc_hdisplay;
 143                         } else {
 144                                 x = y = 0;
 145                                 width = adjusted_mode->crtc_hdisplay;
 146                                 height = adjusted_mode->crtc_vdisplay;
 147                         }
 148                 }
 149                 break;
 150
 151         case DRM_MODE_SCALE_FULLSCREEN:
 152                 x = y = 0;
 153                 width = adjusted_mode->crtc_hdisplay;
 154                 height = adjusted_mode->crtc_vdisplay;
 155                 break;
 156
 157         default:
 158                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 159                 return;
 160         }
 161
 162 done:
 163         pipe_config->pch_pfit.pos = (x << 16) | y;
 164         pipe_config->pch_pfit.size = (width << 16) | height;
 165         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 166 }
 167
 168 static void
 169 centre_horizontally(struct drm_display_mode *adjusted_mode,
 170                     int width)
 171 {
 172         u32 border, sync_pos, blank_width, sync_width;
 173
 174         /* keep the hsync and hblank widths constant */
 175         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 176         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 177         sync_pos = (blank_width - sync_width + 1) / 2;
 178
 179         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 180         border += border & 1; /* make the border even */
 181
 182         adjusted_mode->crtc_hdisplay = width;
 183         adjusted_mode->crtc_hblank_start = width + border;
 184         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 185
 186         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 187         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 188 }
 189
 190 static void
 191 centre_vertically(struct drm_display_mode *adjusted_mode,
 192                   int height)
 193 {
 194         u32 border, sync_pos, blank_width, sync_width;
 195
 196         /* keep the vsync and vblank widths constant */
 197         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 198         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 199         sync_pos = (blank_width - sync_width + 1) / 2;
 200
 201         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 202
 203         adjusted_mode->crtc_vdisplay = height;
 204         adjusted_mode->crtc_vblank_start = height + border;
 205         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 206
 207         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 208         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 209 }
 210
 211 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 212 {
 213         /*
 214          * Floating point operation is not supported. So the FACTOR
 215          * is defined, which can avoid the floating point computation
 216          * when calculating the panel ratio.
 217          */
 218 #define ACCURACY 12
 219 #define FACTOR (1 << ACCURACY)
 220         u32 ratio = source * FACTOR / target;
 221         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 222 }
 223
 224 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 225                               u32 *pfit_control)
 226 {
 227         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 228         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 229                 pipe_config->pipe_src_h;
 230         u32 scaled_height = pipe_config->pipe_src_w *
 231                 adjusted_mode->crtc_vdisplay;
 232
 233         /* 965+ is easy, it does everything in hw */
 234         if (scaled_width > scaled_height)
 235                 *pfit_control |= PFIT_ENABLE |
 236                         PFIT_SCALING_PILLAR;
 237         else if (scaled_width < scaled_height)
 238                 *pfit_control |= PFIT_ENABLE |
 239                         PFIT_SCALING_LETTER;
 240         else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 241                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 242 }
 243
 244 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 245                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 246                               u32 *border)
 247 {
 248         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 249         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 250                 pipe_config->pipe_src_h;
 251         u32 scaled_height = pipe_config->pipe_src_w *
 252                 adjusted_mode->crtc_vdisplay;
 253         u32 bits;
 254
 255         /*
 256          * For earlier chips we have to calculate the scaling
 257          * ratio by hand and program it into the
 258          * PFIT_PGM_RATIO register
 259          */
 260         if (scaled_width > scaled_height) { /* pillar */
 261                 centre_horizontally(adjusted_mode,
 262                                     scaled_height /
 263                                     pipe_config->pipe_src_h);
 264
 265                 *border = LVDS_BORDER_ENABLE;
 266                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 267                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 268                                                     adjusted_mode->crtc_vdisplay);
 269
 270                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 271                                              bits << PFIT_VERT_SCALE_SHIFT);
 272                         *pfit_control |= (PFIT_ENABLE |
 273                                           VERT_INTERP_BILINEAR |
 274                                           HORIZ_INTERP_BILINEAR);
 275                 }
 276         } else if (scaled_width < scaled_height) { /* letter */
 277                 centre_vertically(adjusted_mode,
 278                                   scaled_width /
 279                                   pipe_config->pipe_src_w);
 280
 281                 *border = LVDS_BORDER_ENABLE;
 282                 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 283                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 284                                                     adjusted_mode->crtc_hdisplay);
 285
 286                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 287                                              bits << PFIT_VERT_SCALE_SHIFT);
 288                         *pfit_control |= (PFIT_ENABLE |
 289                                           VERT_INTERP_BILINEAR |
 290                                           HORIZ_INTERP_BILINEAR);
 291                 }
 292         } else {
 293                 /* Aspects match, Let hw scale both directions */
 294                 *pfit_control |= (PFIT_ENABLE |
 295                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 296                                   VERT_INTERP_BILINEAR |
 297                                   HORIZ_INTERP_BILINEAR);
 298         }
 299 }
 300
 301 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 302                               struct intel_crtc_state *pipe_config,
 303                               int fitting_mode)
 304 {
 305         struct drm_device *dev = intel_crtc->base.dev;
 306         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 307         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 308
 309         /* Native modes don't need fitting */
 310         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 311             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 312                 goto out;
 313
 314         switch (fitting_mode) {
 315         case DRM_MODE_SCALE_CENTER:
 316                 /*
 317                  * For centered modes, we have to calculate border widths &
 318                  * heights and modify the values programmed into the CRTC.
 319                  */
 320                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 321                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 322                 border = LVDS_BORDER_ENABLE;
 323                 break;
 324         case DRM_MODE_SCALE_ASPECT:
 325                 /* Scale but preserve the aspect ratio */
 326                 if (INTEL_INFO(dev)->gen >= 4)
 327                         i965_scale_aspect(pipe_config, &pfit_control);
 328                 else
 329                         i9xx_scale_aspect(pipe_config, &pfit_control,
 330                                           &pfit_pgm_ratios, &border);
 331                 break;
 332         case DRM_MODE_SCALE_FULLSCREEN:
 333                 /*
 334                  * Full scaling, even if it changes the aspect ratio.
 335                  * Fortunately this is all done for us in hw.
 336                  */
 337                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 338                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 339                         pfit_control |= PFIT_ENABLE;
 340                         if (INTEL_INFO(dev)->gen >= 4)
 341                                 pfit_control |= PFIT_SCALING_AUTO;
 342                         else
 343                                 pfit_control |= (VERT_AUTO_SCALE |
 344                                                  VERT_INTERP_BILINEAR |
 345                                                  HORIZ_AUTO_SCALE |
 346                                                  HORIZ_INTERP_BILINEAR);
 347                 }
 348                 break;
 349         default:
 350                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 351                 return;
 352         }
 353
 354         /* 965+ wants fuzzy fitting */
 355         /* FIXME: handle multiple panels by failing gracefully */
 356         if (INTEL_INFO(dev)->gen >= 4)
 357                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 358                                  PFIT_FILTER_FUZZY);
 359
 360 out:
 361         if ((pfit_control & PFIT_ENABLE) == 0) {
 362                 pfit_control = 0;
 363                 pfit_pgm_ratios = 0;
 364         }
 365
 366         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 367         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 368                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 369
 370         pipe_config->gmch_pfit.control = pfit_control;
 371         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 372         pipe_config->gmch_pfit.lvds_border_bits = border;
 373 }
 374
 375 enum drm_connector_status
 376 intel_panel_detect(struct drm_device *dev)
 377 {
 378         struct drm_i915_private *dev_priv = dev->dev_private;
 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_device *dev = connector->base.dev;
 463         struct drm_i915_private *dev_priv = dev->dev_private;
 464         struct intel_panel *panel = &connector->panel;
 465
 466         WARN_ON(panel->backlight.max == 0);
 467
 468         if (i915.invert_brightness < 0)
 469                 return val;
 470
 471         if (i915.invert_brightness > 0 ||
 472             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 473                 return panel->backlight.max - val;
 474         }
 475
 476         return val;
 477 }
 478
 479 static u32 lpt_get_backlight(struct intel_connector *connector)
 480 {
 481         struct drm_device *dev = connector->base.dev;
 482         struct drm_i915_private *dev_priv = dev->dev_private;
 483
 484         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 485 }
 486
 487 static u32 pch_get_backlight(struct intel_connector *connector)
 488 {
 489         struct drm_device *dev = connector->base.dev;
 490         struct drm_i915_private *dev_priv = dev->dev_private;
 491
 492         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 493 }
 494
 495 static u32 i9xx_get_backlight(struct intel_connector *connector)
 496 {
 497         struct drm_device *dev = connector->base.dev;
 498         struct drm_i915_private *dev_priv = dev->dev_private;
 499         struct intel_panel *panel = &connector->panel;
 500         u32 val;
 501
 502         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 503         if (INTEL_INFO(dev)->gen < 4)
 504                 val >>= 1;
 505
 506         if (panel->backlight.combination_mode) {
 507                 u8 lbpc;
 508
 509                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 510                 val *= lbpc;
 511         }
 512
 513         return val;
 514 }
 515
 516 static u32 _vlv_get_backlight(struct drm_device *dev, enum i915_pipe pipe)
 517 {
 518         struct drm_i915_private *dev_priv = dev->dev_private;
 519
 520         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 521                 return 0;
 522
 523         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 524 }
 525
 526 static u32 vlv_get_backlight(struct intel_connector *connector)
 527 {
 528         struct drm_device *dev = connector->base.dev;
 529         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 530
 531         return _vlv_get_backlight(dev, pipe);
 532 }
 533
 534 static u32 bxt_get_backlight(struct intel_connector *connector)
 535 {
 536         struct drm_device *dev = connector->base.dev;
 537         struct intel_panel *panel = &connector->panel;
 538         struct drm_i915_private *dev_priv = dev->dev_private;
 539
 540         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 541 }
 542
 543 static u32 pwm_get_backlight(struct intel_connector *connector)
 544 {
 545         struct intel_panel *panel = &connector->panel;
 546         int duty_ns;
 547
 548         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 549         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 550 }
 551
 552 #if 0
 553 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 554 {
 555         struct drm_device *dev = connector->base.dev;
 556         struct drm_i915_private *dev_priv = dev->dev_private;
 557         struct intel_panel *panel = &connector->panel;
 558         u32 val = 0;
 559
 560         mutex_lock(&dev_priv->backlight_lock);
 561
 562         if (panel->backlight.enabled) {
 563                 val = panel->backlight.get(connector);
 564                 val = intel_panel_compute_brightness(connector, val);
 565         }
 566
 567         mutex_unlock(&dev_priv->backlight_lock);
 568
 569         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 570         return val;
 571 }
 572 #endif
 573
 574 static void lpt_set_backlight(struct intel_connector *connector, u32 level)
 575 {
 576         struct drm_device *dev = connector->base.dev;
 577         struct drm_i915_private *dev_priv = dev->dev_private;
 578         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 579         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 580 }
 581
 582 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 583 {
 584         struct drm_device *dev = connector->base.dev;
 585         struct drm_i915_private *dev_priv = dev->dev_private;
 586         u32 tmp;
 587
 588         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 589         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 590 }
 591
 592 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 593 {
 594         struct drm_device *dev = connector->base.dev;
 595         struct drm_i915_private *dev_priv = dev->dev_private;
 596         struct intel_panel *panel = &connector->panel;
 597         u32 tmp, mask;
 598
 599         WARN_ON(panel->backlight.max == 0);
 600
 601         if (panel->backlight.combination_mode) {
 602                 u8 lbpc;
 603
 604                 lbpc = level * 0xfe / panel->backlight.max + 1;
 605                 level /= lbpc;
 606                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 607         }
 608
 609         if (IS_GEN4(dev)) {
 610                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 611         } else {
 612                 level <<= 1;
 613                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 614         }
 615
 616         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 617         I915_WRITE(BLC_PWM_CTL, tmp | level);
 618 }
 619
 620 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 621 {
 622         struct drm_device *dev = connector->base.dev;
 623         struct drm_i915_private *dev_priv = dev->dev_private;
 624         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 625         u32 tmp;
 626
 627         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 628                 return;
 629
 630         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 631         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 632 }
 633
 634 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
 635 {
 636         struct drm_device *dev = connector->base.dev;
 637         struct drm_i915_private *dev_priv = dev->dev_private;
 638         struct intel_panel *panel = &connector->panel;
 639
 640         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 641 }
 642
 643 static void pwm_set_backlight(struct intel_connector *connector, u32 level)
 644 {
 645         struct intel_panel *panel = &connector->panel;
 646         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 647
 648         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 649 }
 650
 651 static void
 652 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 653 {
 654         struct intel_panel *panel = &connector->panel;
 655
 656         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 657
 658         level = intel_panel_compute_brightness(connector, level);
 659         panel->backlight.set(connector, level);
 660 }
 661
 662 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 663 static void intel_panel_set_backlight(struct intel_connector *connector,
 664                                       u32 user_level, u32 user_max)
 665 {
 666         struct drm_device *dev = connector->base.dev;
 667         struct drm_i915_private *dev_priv = dev->dev_private;
 668         struct intel_panel *panel = &connector->panel;
 669         u32 hw_level;
 670
 671         if (!panel->backlight.present)
 672                 return;
 673
 674         mutex_lock(&dev_priv->backlight_lock);
 675
 676         WARN_ON(panel->backlight.max == 0);
 677
 678         hw_level = scale_user_to_hw(connector, user_level, user_max);
 679         panel->backlight.level = hw_level;
 680
 681         if (panel->backlight.enabled)
 682                 intel_panel_actually_set_backlight(connector, hw_level);
 683
 684         mutex_unlock(&dev_priv->backlight_lock);
 685 }
 686
 687 /* set backlight brightness to level in range [0..max], assuming hw min is
 688  * respected.
 689  */
 690 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 691                                     u32 user_level, u32 user_max)
 692 {
 693         struct drm_device *dev = connector->base.dev;
 694         struct drm_i915_private *dev_priv = dev->dev_private;
 695         struct intel_panel *panel = &connector->panel;
 696         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 697         u32 hw_level;
 698
 699         /*
 700          * INVALID_PIPE may occur during driver init because
 701          * connection_mutex isn't held across the entire backlight
 702          * setup + modeset readout, and the BIOS can issue the
 703          * requests at any time.
 704          */
 705         if (!panel->backlight.present || pipe == INVALID_PIPE)
 706                 return;
 707
 708         mutex_lock(&dev_priv->backlight_lock);
 709
 710         WARN_ON(panel->backlight.max == 0);
 711
 712         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 713         panel->backlight.level = hw_level;
 714
 715         if (panel->backlight.device)
 716                 panel->backlight.device->props.brightness =
 717                         scale_hw_to_user(connector,
 718                                          panel->backlight.level,
 719                                          panel->backlight.device->props.max_brightness);
 720
 721         if (panel->backlight.enabled)
 722                 intel_panel_actually_set_backlight(connector, hw_level);
 723
 724         mutex_unlock(&dev_priv->backlight_lock);
 725 }
 726
 727 static void lpt_disable_backlight(struct intel_connector *connector)
 728 {
 729         struct drm_device *dev = connector->base.dev;
 730         struct drm_i915_private *dev_priv = dev->dev_private;
 731         u32 tmp;
 732
 733         intel_panel_actually_set_backlight(connector, 0);
 734
 735         /*
 736          * Although we don't support or enable CPU PWM with LPT/SPT based
 737          * systems, it may have been enabled prior to loading the
 738          * driver. Disable to avoid warnings on LCPLL disable.
 739          *
 740          * This needs rework if we need to add support for CPU PWM on PCH split
 741          * platforms.
 742          */
 743         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 744         if (tmp & BLM_PWM_ENABLE) {
 745                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
 746                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 747         }
 748
 749         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 750         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 751 }
 752
 753 static void pch_disable_backlight(struct intel_connector *connector)
 754 {
 755         struct drm_device *dev = connector->base.dev;
 756         struct drm_i915_private *dev_priv = dev->dev_private;
 757         u32 tmp;
 758
 759         intel_panel_actually_set_backlight(connector, 0);
 760
 761         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 762         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 763
 764         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 765         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 766 }
 767
 768 static void i9xx_disable_backlight(struct intel_connector *connector)
 769 {
 770         intel_panel_actually_set_backlight(connector, 0);
 771 }
 772
 773 static void i965_disable_backlight(struct intel_connector *connector)
 774 {
 775         struct drm_device *dev = connector->base.dev;
 776         struct drm_i915_private *dev_priv = dev->dev_private;
 777         u32 tmp;
 778
 779         intel_panel_actually_set_backlight(connector, 0);
 780
 781         tmp = I915_READ(BLC_PWM_CTL2);
 782         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 783 }
 784
 785 static void vlv_disable_backlight(struct intel_connector *connector)
 786 {
 787         struct drm_device *dev = connector->base.dev;
 788         struct drm_i915_private *dev_priv = dev->dev_private;
 789         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 790         u32 tmp;
 791
 792         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 793                 return;
 794
 795         intel_panel_actually_set_backlight(connector, 0);
 796
 797         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 798         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 799 }
 800
 801 static void bxt_disable_backlight(struct intel_connector *connector)
 802 {
 803         struct drm_device *dev = connector->base.dev;
 804         struct drm_i915_private *dev_priv = dev->dev_private;
 805         struct intel_panel *panel = &connector->panel;
 806         u32 tmp, val;
 807
 808         intel_panel_actually_set_backlight(connector, 0);
 809
 810         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 811         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 812                         tmp & ~BXT_BLC_PWM_ENABLE);
 813
 814         if (panel->backlight.controller == 1) {
 815                 val = I915_READ(UTIL_PIN_CTL);
 816                 val &= ~UTIL_PIN_ENABLE;
 817                 I915_WRITE(UTIL_PIN_CTL, val);
 818         }
 819 }
 820
 821 static void pwm_disable_backlight(struct intel_connector *connector)
 822 {
 823         struct intel_panel *panel = &connector->panel;
 824
 825         /* Disable the backlight */
 826         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 827         usleep_range(2000, 3000);
 828         pwm_disable(panel->backlight.pwm);
 829 }
 830
 831 void intel_panel_disable_backlight(struct intel_connector *connector)
 832 {
 833         struct drm_device *dev = connector->base.dev;
 834         struct drm_i915_private *dev_priv = dev->dev_private;
 835         struct intel_panel *panel = &connector->panel;
 836
 837         if (!panel->backlight.present)
 838                 return;
 839
 840         /*
 841          * Do not disable backlight on the vga_switcheroo path. When switching
 842          * away from i915, the other client may depend on i915 to handle the
 843          * backlight. This will leave the backlight on unnecessarily when
 844          * another client is not activated.
 845          */
 846         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 847                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 848                 return;
 849         }
 850
 851         mutex_lock(&dev_priv->backlight_lock);
 852
 853         if (panel->backlight.device)
 854                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 855         panel->backlight.enabled = false;
 856         panel->backlight.disable(connector);
 857
 858         mutex_unlock(&dev_priv->backlight_lock);
 859 }
 860
 861 static void lpt_enable_backlight(struct intel_connector *connector)
 862 {
 863         struct drm_device *dev = connector->base.dev;
 864         struct drm_i915_private *dev_priv = dev->dev_private;
 865         struct intel_panel *panel = &connector->panel;
 866         u32 pch_ctl1, pch_ctl2;
 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         pch_ctl2 = panel->backlight.max << 16;
 876         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 877
 878         pch_ctl1 = 0;
 879         if (panel->backlight.active_low_pwm)
 880                 pch_ctl1 |= BLM_PCH_POLARITY;
 881
 882         /* After LPT, override is the default. */
 883         if (HAS_PCH_LPT(dev_priv))
 884                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 885
 886         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 887         POSTING_READ(BLC_PWM_PCH_CTL1);
 888         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 889
 890         /* This won't stick until the above enable. */
 891         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 892 }
 893
 894 static void pch_enable_backlight(struct intel_connector *connector)
 895 {
 896         struct drm_device *dev = connector->base.dev;
 897         struct drm_i915_private *dev_priv = dev->dev_private;
 898         struct intel_panel *panel = &connector->panel;
 899         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 900         enum transcoder cpu_transcoder =
 901                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 902         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 903
 904         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 905         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 906                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 907                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 908                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 909         }
 910
 911         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 912         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 913                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 914                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 915                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 916         }
 917
 918         if (cpu_transcoder == TRANSCODER_EDP)
 919                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 920         else
 921                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 922         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 923         POSTING_READ(BLC_PWM_CPU_CTL2);
 924         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 925
 926         /* This won't stick until the above enable. */
 927         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 928
 929         pch_ctl2 = panel->backlight.max << 16;
 930         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 931
 932         pch_ctl1 = 0;
 933         if (panel->backlight.active_low_pwm)
 934                 pch_ctl1 |= BLM_PCH_POLARITY;
 935
 936         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 937         POSTING_READ(BLC_PWM_PCH_CTL1);
 938         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 939 }
 940
 941 static void i9xx_enable_backlight(struct intel_connector *connector)
 942 {
 943         struct drm_device *dev = connector->base.dev;
 944         struct drm_i915_private *dev_priv = dev->dev_private;
 945         struct intel_panel *panel = &connector->panel;
 946         u32 ctl, freq;
 947
 948         ctl = I915_READ(BLC_PWM_CTL);
 949         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 950                 DRM_DEBUG_KMS("backlight already enabled\n");
 951                 I915_WRITE(BLC_PWM_CTL, 0);
 952         }
 953
 954         freq = panel->backlight.max;
 955         if (panel->backlight.combination_mode)
 956                 freq /= 0xff;
 957
 958         ctl = freq << 17;
 959         if (panel->backlight.combination_mode)
 960                 ctl |= BLM_LEGACY_MODE;
 961         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 962                 ctl |= BLM_POLARITY_PNV;
 963
 964         I915_WRITE(BLC_PWM_CTL, ctl);
 965         POSTING_READ(BLC_PWM_CTL);
 966
 967         /* XXX: combine this into above write? */
 968         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 969
 970         /*
 971          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 972          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 973          * that has backlight.
 974          */
 975         if (IS_GEN2(dev))
 976                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 977 }
 978
 979 static void i965_enable_backlight(struct intel_connector *connector)
 980 {
 981         struct drm_device *dev = connector->base.dev;
 982         struct drm_i915_private *dev_priv = dev->dev_private;
 983         struct intel_panel *panel = &connector->panel;
 984         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 985         u32 ctl, ctl2, freq;
 986
 987         ctl2 = I915_READ(BLC_PWM_CTL2);
 988         if (ctl2 & BLM_PWM_ENABLE) {
 989                 DRM_DEBUG_KMS("backlight already enabled\n");
 990                 ctl2 &= ~BLM_PWM_ENABLE;
 991                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 992         }
 993
 994         freq = panel->backlight.max;
 995         if (panel->backlight.combination_mode)
 996                 freq /= 0xff;
 997
 998         ctl = freq << 16;
 999         I915_WRITE(BLC_PWM_CTL, ctl);
1000
1001         ctl2 = BLM_PIPE(pipe);
1002         if (panel->backlight.combination_mode)
1003                 ctl2 |= BLM_COMBINATION_MODE;
1004         if (panel->backlight.active_low_pwm)
1005                 ctl2 |= BLM_POLARITY_I965;
1006         I915_WRITE(BLC_PWM_CTL2, ctl2);
1007         POSTING_READ(BLC_PWM_CTL2);
1008         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1009
1010         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1011 }
1012
1013 static void vlv_enable_backlight(struct intel_connector *connector)
1014 {
1015         struct drm_device *dev = connector->base.dev;
1016         struct drm_i915_private *dev_priv = dev->dev_private;
1017         struct intel_panel *panel = &connector->panel;
1018         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
1019         u32 ctl, ctl2;
1020
1021         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1022                 return;
1023
1024         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1025         if (ctl2 & BLM_PWM_ENABLE) {
1026                 DRM_DEBUG_KMS("backlight already enabled\n");
1027                 ctl2 &= ~BLM_PWM_ENABLE;
1028                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1029         }
1030
1031         ctl = panel->backlight.max << 16;
1032         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1033
1034         /* XXX: combine this into above write? */
1035         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1036
1037         ctl2 = 0;
1038         if (panel->backlight.active_low_pwm)
1039                 ctl2 |= BLM_POLARITY_I965;
1040         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1041         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1042         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1043 }
1044
1045 static void bxt_enable_backlight(struct intel_connector *connector)
1046 {
1047         struct drm_device *dev = connector->base.dev;
1048         struct drm_i915_private *dev_priv = dev->dev_private;
1049         struct intel_panel *panel = &connector->panel;
1050         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
1051         u32 pwm_ctl, val;
1052
1053         /* To use 2nd set of backlight registers, utility pin has to be
1054          * enabled with PWM mode.
1055          * The field should only be changed when the utility pin is disabled
1056          */
1057         if (panel->backlight.controller == 1) {
1058                 val = I915_READ(UTIL_PIN_CTL);
1059                 if (val & UTIL_PIN_ENABLE) {
1060                         DRM_DEBUG_KMS("util pin already enabled\n");
1061                         val &= ~UTIL_PIN_ENABLE;
1062                         I915_WRITE(UTIL_PIN_CTL, val);
1063                 }
1064
1065                 val = 0;
1066                 if (panel->backlight.util_pin_active_low)
1067                         val |= UTIL_PIN_POLARITY;
1068                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1069                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1070         }
1071
1072         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1073         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1074                 DRM_DEBUG_KMS("backlight already enabled\n");
1075                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1076                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1077                                 pwm_ctl);
1078         }
1079
1080         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1081                         panel->backlight.max);
1082
1083         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1084
1085         pwm_ctl = 0;
1086         if (panel->backlight.active_low_pwm)
1087                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1088
1089         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1090         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1091         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1092                         pwm_ctl | BXT_BLC_PWM_ENABLE);
1093 }
1094
1095 static void pwm_enable_backlight(struct intel_connector *connector)
1096 {
1097         struct intel_panel *panel = &connector->panel;
1098
1099         pwm_enable(panel->backlight.pwm);
1100         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1101 }
1102
1103 void intel_panel_enable_backlight(struct intel_connector *connector)
1104 {
1105         struct drm_device *dev = connector->base.dev;
1106         struct drm_i915_private *dev_priv = dev->dev_private;
1107         struct intel_panel *panel = &connector->panel;
1108         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
1109
1110         if (!panel->backlight.present)
1111                 return;
1112
1113         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1114
1115         mutex_lock(&dev_priv->backlight_lock);
1116
1117         WARN_ON(panel->backlight.max == 0);
1118
1119         if (panel->backlight.level <= panel->backlight.min) {
1120                 panel->backlight.level = panel->backlight.max;
1121                 if (panel->backlight.device)
1122                         panel->backlight.device->props.brightness =
1123                                 scale_hw_to_user(connector,
1124                                                  panel->backlight.level,
1125                                                  panel->backlight.device->props.max_brightness);
1126         }
1127
1128         panel->backlight.enable(connector);
1129         panel->backlight.enabled = true;
1130         if (panel->backlight.device)
1131                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1132
1133         mutex_unlock(&dev_priv->backlight_lock);
1134 }
1135
1136 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1137 static int intel_backlight_device_update_status(struct backlight_device *bd)
1138 {
1139 #if 0
1140         struct intel_connector *connector = bl_get_data(bd);
1141         struct intel_panel *panel = &connector->panel;
1142         struct drm_device *dev = connector->base.dev;
1143
1144         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1145         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1146                       bd->props.brightness, bd->props.max_brightness);
1147         intel_panel_set_backlight(connector, bd->props.brightness,
1148                                   bd->props.max_brightness);
1149
1150         /*
1151          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1152          * backlight class device does not make it easy to to differentiate
1153          * between callbacks for brightness and bl_power, so our backlight_power
1154          * callback needs to take this into account.
1155          */
1156         if (panel->backlight.enabled) {
1157                 if (panel->backlight.power) {
1158                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1159                                 bd->props.brightness != 0;
1160                         panel->backlight.power(connector, enable);
1161                 }
1162         } else {
1163                 bd->props.power = FB_BLANK_POWERDOWN;
1164         }
1165
1166         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1167 #endif
1168         return 0;
1169 }
1170
1171 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1172 {
1173 #if 0
1174         struct intel_connector *connector = bl_get_data(bd);
1175         struct drm_device *dev = connector->base.dev;
1176         struct drm_i915_private *dev_priv = dev->dev_private;
1177         u32 hw_level;
1178         int ret;
1179
1180         intel_runtime_pm_get(dev_priv);
1181         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1182
1183         hw_level = intel_panel_get_backlight(connector);
1184         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1185
1186         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1187         intel_runtime_pm_put(dev_priv);
1188
1189         return ret;
1190 #endif
1191         return 0;
1192 }
1193
1194 static const struct backlight_ops intel_backlight_device_ops = {
1195         .update_status = intel_backlight_device_update_status,
1196         .get_brightness = intel_backlight_device_get_brightness,
1197 };
1198
1199 static int intel_backlight_device_register(struct intel_connector *connector)
1200 {
1201         struct intel_panel *panel = &connector->panel;
1202         struct backlight_properties props;
1203
1204         if (WARN_ON(panel->backlight.device))
1205                 return -ENODEV;
1206
1207         if (!panel->backlight.present)
1208                 return 0;
1209
1210         WARN_ON(panel->backlight.max == 0);
1211
1212         memset(&props, 0, sizeof(props));
1213         props.type = BACKLIGHT_RAW;
1214
1215         /*
1216          * Note: Everything should work even if the backlight device max
1217          * presented to the userspace is arbitrarily chosen.
1218          */
1219         props.max_brightness = panel->backlight.max;
1220         props.brightness = scale_hw_to_user(connector,
1221                                             panel->backlight.level,
1222                                             props.max_brightness);
1223
1224         if (panel->backlight.enabled)
1225                 props.power = FB_BLANK_UNBLANK;
1226         else
1227                 props.power = FB_BLANK_POWERDOWN;
1228
1229         /*
1230          * Note: using the same name independent of the connector prevents
1231          * registration of multiple backlight devices in the driver.
1232          */
1233 #if 0
1234         panel->backlight.device =
1235                 backlight_device_register("intel_backlight",
1236                                           connector->base.kdev,
1237                                           connector,
1238                                           &intel_backlight_device_ops, &props);
1239
1240         if (IS_ERR(panel->backlight.device)) {
1241                 DRM_ERROR("Failed to register backlight: %ld\n",
1242                           PTR_ERR(panel->backlight.device));
1243                 panel->backlight.device = NULL;
1244                 return -ENODEV;
1245         }
1246
1247         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1248                       connector->base.name);
1249 #endif
1250
1251         return 0;
1252 }
1253
1254 static void intel_backlight_device_unregister(struct intel_connector *connector)
1255 {
1256 #if 0
1257         struct intel_panel *panel = &connector->panel;
1258
1259         if (panel->backlight.device) {
1260                 backlight_device_unregister(panel->backlight.device);
1261                 panel->backlight.device = NULL;
1262         }
1263 #endif
1264 }
1265 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1266 static int intel_backlight_device_register(struct intel_connector *connector)
1267 {
1268         return 0;
1269 }
1270 static void intel_backlight_device_unregister(struct intel_connector *connector)
1271 {
1272 }
1273 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1274
1275 /*
1276  * SPT: This value represents the period of the PWM stream in clock periods
1277  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1278  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1279  */
1280 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1281 {
1282         struct drm_device *dev = connector->base.dev;
1283         struct drm_i915_private *dev_priv = dev->dev_private;
1284         u32 mul, clock;
1285
1286         if (I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY)
1287                 mul = 128;
1288         else
1289                 mul = 16;
1290
1291         clock = MHz(24);
1292
1293         return clock / (pwm_freq_hz * mul);
1294 }
1295
1296 /*
1297  * LPT: This value represents the period of the PWM stream in clock periods
1298  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1299  * LPT SOUTH_CHICKEN2 register bit 5).
1300  */
1301 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1302 {
1303         struct drm_device *dev = connector->base.dev;
1304         struct drm_i915_private *dev_priv = dev->dev_private;
1305         u32 mul, clock;
1306
1307         if (I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY)
1308                 mul = 16;
1309         else
1310                 mul = 128;
1311
1312         if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE)
1313                 clock = MHz(135); /* LPT:H */
1314         else
1315                 clock = MHz(24); /* LPT:LP */
1316
1317         return clock / (pwm_freq_hz * mul);
1318 }
1319
1320 /*
1321  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1322  * display raw clocks multiplied by 128.
1323  */
1324 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1325 {
1326         struct drm_device *dev = connector->base.dev;
1327         int clock = MHz(intel_pch_rawclk(dev));
1328
1329         return clock / (pwm_freq_hz * 128);
1330 }
1331
1332 /*
1333  * Gen2: This field determines the number of time base events (display core
1334  * clock frequency/32) in total for a complete cycle of modulated backlight
1335  * control.
1336  *
1337  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1338  * divided by 32.
1339  */
1340 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1341 {
1342         struct drm_device *dev = connector->base.dev;
1343         struct drm_i915_private *dev_priv = dev->dev_private;
1344         int clock;
1345
1346         if (IS_PINEVIEW(dev))
1347                 clock = intel_hrawclk(dev);
1348         else
1349                 clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
1350
1351         return clock / (pwm_freq_hz * 32);
1352 }
1353
1354 /*
1355  * Gen4: This value represents the period of the PWM stream in display core
1356  * clocks multiplied by 128.
1357  */
1358 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1359 {
1360         struct drm_device *dev = connector->base.dev;
1361         struct drm_i915_private *dev_priv = dev->dev_private;
1362         int clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
1363
1364         return clock / (pwm_freq_hz * 128);
1365 }
1366
1367 /*
1368  * VLV: This value represents the period of the PWM stream in display core
1369  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1370  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1371  */
1372 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1373 {
1374         struct drm_device *dev = connector->base.dev;
1375         struct drm_i915_private *dev_priv = dev->dev_private;
1376         int clock;
1377
1378         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1379                 if (IS_CHERRYVIEW(dev))
1380                         return KHz(19200) / (pwm_freq_hz * 16);
1381                 else
1382                         return MHz(25) / (pwm_freq_hz * 16);
1383         } else {
1384                 clock = intel_hrawclk(dev);
1385                 return MHz(clock) / (pwm_freq_hz * 128);
1386         }
1387 }
1388
1389 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1390 {
1391         struct drm_device *dev = connector->base.dev;
1392         struct drm_i915_private *dev_priv = dev->dev_private;
1393         struct intel_panel *panel = &connector->panel;
1394         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1395         u32 pwm;
1396
1397         if (!pwm_freq_hz) {
1398                 DRM_DEBUG_KMS("backlight frequency not specified in VBT\n");
1399                 return 0;
1400         }
1401
1402         if (!panel->backlight.hz_to_pwm) {
1403                 DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
1404                 return 0;
1405         }
1406
1407         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1408         if (!pwm) {
1409                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1410                 return 0;
1411         }
1412
1413         DRM_DEBUG_KMS("backlight frequency %u Hz from VBT\n", pwm_freq_hz);
1414
1415         return pwm;
1416 }
1417
1418 /*
1419  * Note: The setup hooks can't assume pipe is set!
1420  */
1421 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1422 {
1423         struct drm_device *dev = connector->base.dev;
1424         struct drm_i915_private *dev_priv = dev->dev_private;
1425         struct intel_panel *panel = &connector->panel;
1426         int min;
1427
1428         WARN_ON(panel->backlight.max == 0);
1429
1430         /*
1431          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1432          * to problems. There are such machines out there. Either our
1433          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1434          * against this by letting the minimum be at most (arbitrarily chosen)
1435          * 25% of the max.
1436          */
1437         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1438         if (min != dev_priv->vbt.backlight.min_brightness) {
1439                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1440                               dev_priv->vbt.backlight.min_brightness, min);
1441         }
1442
1443         /* vbt value is a coefficient in range [0..255] */
1444         return scale(min, 0, 255, 0, panel->backlight.max);
1445 }
1446
1447 static int lpt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1448 {
1449         struct drm_device *dev = connector->base.dev;
1450         struct drm_i915_private *dev_priv = dev->dev_private;
1451         struct intel_panel *panel = &connector->panel;
1452         u32 pch_ctl1, pch_ctl2, val;
1453
1454         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1455         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1456
1457         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1458         panel->backlight.max = pch_ctl2 >> 16;
1459
1460         if (!panel->backlight.max)
1461                 panel->backlight.max = get_backlight_max_vbt(connector);
1462
1463         if (!panel->backlight.max)
1464                 return -ENODEV;
1465
1466         panel->backlight.min = get_backlight_min_vbt(connector);
1467
1468         val = lpt_get_backlight(connector);
1469         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1470
1471         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1472                 panel->backlight.level != 0;
1473
1474         return 0;
1475 }
1476
1477 static int pch_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1478 {
1479         struct drm_device *dev = connector->base.dev;
1480         struct drm_i915_private *dev_priv = dev->dev_private;
1481         struct intel_panel *panel = &connector->panel;
1482         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1483
1484         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1485         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1486
1487         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1488         panel->backlight.max = pch_ctl2 >> 16;
1489
1490         if (!panel->backlight.max)
1491                 panel->backlight.max = get_backlight_max_vbt(connector);
1492
1493         if (!panel->backlight.max)
1494                 return -ENODEV;
1495
1496         panel->backlight.min = get_backlight_min_vbt(connector);
1497
1498         val = pch_get_backlight(connector);
1499         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1500
1501         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1502         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1503                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1504
1505         return 0;
1506 }
1507
1508 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1509 {
1510         struct drm_device *dev = connector->base.dev;
1511         struct drm_i915_private *dev_priv = dev->dev_private;
1512         struct intel_panel *panel = &connector->panel;
1513         u32 ctl, val;
1514
1515         ctl = I915_READ(BLC_PWM_CTL);
1516
1517         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1518                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1519
1520         if (IS_PINEVIEW(dev))
1521                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1522
1523         panel->backlight.max = ctl >> 17;
1524
1525         if (!panel->backlight.max) {
1526                 panel->backlight.max = get_backlight_max_vbt(connector);
1527                 panel->backlight.max >>= 1;
1528         }
1529
1530         if (!panel->backlight.max)
1531                 return -ENODEV;
1532
1533         if (panel->backlight.combination_mode)
1534                 panel->backlight.max *= 0xff;
1535
1536         panel->backlight.min = get_backlight_min_vbt(connector);
1537
1538         val = i9xx_get_backlight(connector);
1539         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1540
1541         panel->backlight.enabled = panel->backlight.level != 0;
1542
1543         return 0;
1544 }
1545
1546 static int i965_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1547 {
1548         struct drm_device *dev = connector->base.dev;
1549         struct drm_i915_private *dev_priv = dev->dev_private;
1550         struct intel_panel *panel = &connector->panel;
1551         u32 ctl, ctl2, val;
1552
1553         ctl2 = I915_READ(BLC_PWM_CTL2);
1554         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1555         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1556
1557         ctl = I915_READ(BLC_PWM_CTL);
1558         panel->backlight.max = ctl >> 16;
1559
1560         if (!panel->backlight.max)
1561                 panel->backlight.max = get_backlight_max_vbt(connector);
1562
1563         if (!panel->backlight.max)
1564                 return -ENODEV;
1565
1566         if (panel->backlight.combination_mode)
1567                 panel->backlight.max *= 0xff;
1568
1569         panel->backlight.min = get_backlight_min_vbt(connector);
1570
1571         val = i9xx_get_backlight(connector);
1572         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1573
1574         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1575                 panel->backlight.level != 0;
1576
1577         return 0;
1578 }
1579
1580 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_pipe pipe)
1581 {
1582         struct drm_device *dev = connector->base.dev;
1583         struct drm_i915_private *dev_priv = dev->dev_private;
1584         struct intel_panel *panel = &connector->panel;
1585         u32 ctl, ctl2, val;
1586
1587         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1588                 return -ENODEV;
1589
1590         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1591         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1592
1593         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1594         panel->backlight.max = ctl >> 16;
1595
1596         if (!panel->backlight.max)
1597                 panel->backlight.max = get_backlight_max_vbt(connector);
1598
1599         if (!panel->backlight.max)
1600                 return -ENODEV;
1601
1602         panel->backlight.min = get_backlight_min_vbt(connector);
1603
1604         val = _vlv_get_backlight(dev, pipe);
1605         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1606
1607         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1608                 panel->backlight.level != 0;
1609
1610         return 0;
1611 }
1612
1613 #ifdef __DragonFly__
1614 /*
1615  * Read max backlight level
1616  */
1617 static int
1618 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1619 {
1620         int err, val;
1621         struct intel_connector *connector = arg1;
1622         struct drm_device *dev = connector->base.dev;
1623         struct drm_i915_private *dev_priv = dev->dev_private;
1624         struct intel_panel *panel = &connector->panel;
1625
1626         mutex_lock(&dev_priv->backlight_lock);
1627         val = panel->backlight.max;
1628         mutex_unlock(&dev_priv->backlight_lock);
1629
1630         err = sysctl_handle_int(oidp, &val, 0, req);
1631         return(err);
1632 }
1633
1634 /*
1635  * Read/write backlight level
1636  */
1637 static int
1638 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1639 {
1640         struct intel_connector *connector = arg1;
1641         struct drm_device *dev = connector->base.dev;
1642         struct drm_i915_private *dev_priv = dev->dev_private;
1643         struct intel_panel *panel = &connector->panel;
1644         int err, val;
1645         u32 user_level, max_brightness;
1646
1647         mutex_lock(&dev_priv->backlight_lock);
1648         max_brightness = panel->backlight.max;
1649         user_level = scale_hw_to_user(connector, panel->backlight.level,
1650             max_brightness);
1651         mutex_unlock(&dev_priv->backlight_lock);
1652
1653         val = user_level;
1654         err = sysctl_handle_int(oidp, &val, 0, req);
1655         if (err != 0 || req->newptr == NULL) {
1656                 return(err);
1657         }
1658
1659         if (val != user_level && val >= 0 && val <= max_brightness) {
1660                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1661                 intel_panel_set_backlight(arg1, val, max_brightness);
1662                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1663         }
1664
1665         return(err);
1666 }
1667 #endif /* __DragonFly__ */
1668
1669 static int
1670 bxt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1671 {
1672         struct drm_device *dev = connector->base.dev;
1673         struct drm_i915_private *dev_priv = dev->dev_private;
1674         struct intel_panel *panel = &connector->panel;
1675         u32 pwm_ctl, val;
1676
1677         /*
1678          * For BXT hard coding the Backlight controller to 0.
1679          * TODO : Read the controller value from VBT and generalize
1680          */
1681         panel->backlight.controller = 0;
1682
1683         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1684
1685         /* Keeping the check if controller 1 is to be programmed.
1686          * This will come into affect once the VBT parsing
1687          * is fixed for controller selection, and controller 1 is used
1688          * for a prticular display configuration.
1689          */
1690         if (panel->backlight.controller == 1) {
1691                 val = I915_READ(UTIL_PIN_CTL);
1692                 panel->backlight.util_pin_active_low =
1693                                         val & UTIL_PIN_POLARITY;
1694         }
1695
1696         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1697         panel->backlight.max =
1698                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1699
1700         if (!panel->backlight.max)
1701                 panel->backlight.max = get_backlight_max_vbt(connector);
1702
1703         if (!panel->backlight.max)
1704                 return -ENODEV;
1705
1706         val = bxt_get_backlight(connector);
1707         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1708
1709         panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1710                 panel->backlight.level != 0;
1711
1712         return 0;
1713 }
1714
1715 static int pwm_setup_backlight(struct intel_connector *connector,
1716                                enum i915_pipe pipe)
1717 {
1718         struct drm_device *dev = connector->base.dev;
1719         struct intel_panel *panel = &connector->panel;
1720         int retval;
1721
1722         /* Get the PWM chip for backlight control */
1723         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1724         if (IS_ERR(panel->backlight.pwm)) {
1725                 DRM_ERROR("Failed to own the pwm chip\n");
1726                 panel->backlight.pwm = NULL;
1727                 return -ENODEV;
1728         }
1729
1730         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1731                             CRC_PMIC_PWM_PERIOD_NS);
1732         if (retval < 0) {
1733                 DRM_ERROR("Failed to configure the pwm chip\n");
1734                 pwm_put(panel->backlight.pwm);
1735                 panel->backlight.pwm = NULL;
1736                 return retval;
1737         }
1738
1739         panel->backlight.min = 0; /* 0% */
1740         panel->backlight.max = 100; /* 100% */
1741         panel->backlight.level = DIV_ROUND_UP(
1742                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1743                                  CRC_PMIC_PWM_PERIOD_NS);
1744         panel->backlight.enabled = panel->backlight.level != 0;
1745
1746         return 0;
1747 }
1748
1749 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe)
1750 {
1751         struct drm_device *dev = connector->dev;
1752         struct drm_i915_private *dev_priv = dev->dev_private;
1753         struct intel_connector *intel_connector = to_intel_connector(connector);
1754         struct intel_panel *panel = &intel_connector->panel;
1755         int ret;
1756
1757         if (!dev_priv->vbt.backlight.present) {
1758                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1759                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1760                 } else {
1761                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1762                         return 0;
1763                 }
1764         }
1765
1766         /* ensure intel_panel has been initialized first */
1767         if (WARN_ON(!panel->backlight.setup))
1768                 return -ENODEV;
1769
1770         /* set level and max in panel struct */
1771         mutex_lock(&dev_priv->backlight_lock);
1772         ret = panel->backlight.setup(intel_connector, pipe);
1773         mutex_unlock(&dev_priv->backlight_lock);
1774
1775         if (ret) {
1776                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1777                               connector->name);
1778                 return ret;
1779         }
1780
1781         panel->backlight.present = true;
1782
1783 #ifdef __DragonFly__
1784         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1785                         OID_AUTO, "backlight_max",
1786                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1787                         connector, sizeof(int),
1788                         sysctl_backlight_max,
1789                         "I", "Max backlight level");
1790         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1791                         OID_AUTO, "backlight_level",
1792                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1793                         connector, sizeof(int),
1794                         sysctl_backlight_handler,
1795                         "I", "Backlight level");
1796 #endif
1797
1798         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1799                       connector->name,
1800                       panel->backlight.enabled ? "enabled" : "disabled",
1801                       panel->backlight.level, panel->backlight.max);
1802
1803         return 0;
1804 }
1805
1806 void intel_panel_destroy_backlight(struct drm_connector *connector)
1807 {
1808         struct intel_connector *intel_connector = to_intel_connector(connector);
1809         struct intel_panel *panel = &intel_connector->panel;
1810
1811         /* dispose of the pwm */
1812         if (panel->backlight.pwm)
1813                 pwm_put(panel->backlight.pwm);
1814
1815         panel->backlight.present = false;
1816 }
1817
1818 /* Set up chip specific backlight functions */
1819 static void
1820 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1821 {
1822         struct intel_connector *intel_connector =
1823                 container_of(panel, struct intel_connector, panel);
1824         struct drm_device *dev = intel_connector->base.dev;
1825         struct drm_i915_private *dev_priv = dev->dev_private;
1826
1827         if (IS_BROXTON(dev)) {
1828                 panel->backlight.setup = bxt_setup_backlight;
1829                 panel->backlight.enable = bxt_enable_backlight;
1830                 panel->backlight.disable = bxt_disable_backlight;
1831                 panel->backlight.set = bxt_set_backlight;
1832                 panel->backlight.get = bxt_get_backlight;
1833         } else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
1834                 panel->backlight.setup = lpt_setup_backlight;
1835                 panel->backlight.enable = lpt_enable_backlight;
1836                 panel->backlight.disable = lpt_disable_backlight;
1837                 panel->backlight.set = lpt_set_backlight;
1838                 panel->backlight.get = lpt_get_backlight;
1839                 if (HAS_PCH_LPT(dev))
1840                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1841                 else
1842                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1843         } else if (HAS_PCH_SPLIT(dev)) {
1844                 panel->backlight.setup = pch_setup_backlight;
1845                 panel->backlight.enable = pch_enable_backlight;
1846                 panel->backlight.disable = pch_disable_backlight;
1847                 panel->backlight.set = pch_set_backlight;
1848                 panel->backlight.get = pch_get_backlight;
1849                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1850         } else if (IS_VALLEYVIEW(dev)) {
1851                 if (dev_priv->vbt.has_mipi) {
1852                         panel->backlight.setup = pwm_setup_backlight;
1853                         panel->backlight.enable = pwm_enable_backlight;
1854                         panel->backlight.disable = pwm_disable_backlight;
1855                         panel->backlight.set = pwm_set_backlight;
1856                         panel->backlight.get = pwm_get_backlight;
1857                 } else {
1858                         panel->backlight.setup = vlv_setup_backlight;
1859                         panel->backlight.enable = vlv_enable_backlight;
1860                         panel->backlight.disable = vlv_disable_backlight;
1861                         panel->backlight.set = vlv_set_backlight;
1862                         panel->backlight.get = vlv_get_backlight;
1863                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1864                 }
1865         } else if (IS_GEN4(dev)) {
1866                 panel->backlight.setup = i965_setup_backlight;
1867                 panel->backlight.enable = i965_enable_backlight;
1868                 panel->backlight.disable = i965_disable_backlight;
1869                 panel->backlight.set = i9xx_set_backlight;
1870                 panel->backlight.get = i9xx_get_backlight;
1871                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1872         } else {
1873                 panel->backlight.setup = i9xx_setup_backlight;
1874                 panel->backlight.enable = i9xx_enable_backlight;
1875                 panel->backlight.disable = i9xx_disable_backlight;
1876                 panel->backlight.set = i9xx_set_backlight;
1877                 panel->backlight.get = i9xx_get_backlight;
1878                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1879         }
1880 }
1881
1882 int intel_panel_init(struct intel_panel *panel,
1883                      struct drm_display_mode *fixed_mode,
1884                      struct drm_display_mode *downclock_mode)
1885 {
1886         intel_panel_init_backlight_funcs(panel);
1887
1888         panel->fixed_mode = fixed_mode;
1889         panel->downclock_mode = downclock_mode;
1890
1891         return 0;
1892 }
1893
1894 void intel_panel_fini(struct intel_panel *panel)
1895 {
1896         struct intel_connector *intel_connector =
1897                 container_of(panel, struct intel_connector, panel);
1898
1899         if (panel->fixed_mode)
1900                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1901
1902         if (panel->downclock_mode)
1903                 drm_mode_destroy(intel_connector->base.dev,
1904                                 panel->downclock_mode);
1905 }
1906
1907 void intel_backlight_register(struct drm_device *dev)
1908 {
1909         struct intel_connector *connector;
1910
1911         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1912                 intel_backlight_device_register(connector);
1913 }
1914
1915 void intel_backlight_unregister(struct drm_device *dev)
1916 {
1917         struct intel_connector *connector;
1918
1919         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1920                 intel_backlight_device_unregister(connector);
1921 }