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: drm device
  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_device *dev,
  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, 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_device *dev = 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_INFO(dev)->gen >= 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_INFO(dev)->gen >= 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_INFO(dev)->gen >= 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_INFO(dev)->gen < 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_device *dev)
 379 {
 380         struct drm_i915_private *dev_priv = dev->dev_private;
 381
 382         /* Assume that the BIOS does not lie through the OpRegion... */
 383         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 384                 return *dev_priv->opregion.lid_state & 0x1 ?
 385                         connector_status_connected :
 386                         connector_status_disconnected;
 387         }
 388
 389         switch (i915.panel_ignore_lid) {
 390         case -2:
 391                 return connector_status_connected;
 392         case -1:
 393                 return connector_status_disconnected;
 394         default:
 395                 return connector_status_unknown;
 396         }
 397 }
 398
 399 /**
 400  * scale - scale values from one range to another
 401  *
 402  * @source_val: value in range [@source_min..@source_max]
 403  *
 404  * Return @source_val in range [@source_min..@source_max] scaled to range
 405  * [@target_min..@target_max].
 406  */
 407 static uint32_t scale(uint32_t source_val,
 408                       uint32_t source_min, uint32_t source_max,
 409                       uint32_t target_min, uint32_t target_max)
 410 {
 411         uint64_t target_val;
 412
 413         WARN_ON(source_min > source_max);
 414         WARN_ON(target_min > target_max);
 415
 416         /* defensive */
 417         source_val = clamp(source_val, source_min, source_max);
 418
 419         /* avoid overflows */
 420         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 421                         (target_max - target_min), source_max - source_min);
 422         target_val += target_min;
 423
 424         return target_val;
 425 }
 426
 427 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 428 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 429                                    u32 user_level, u32 user_max)
 430 {
 431         struct intel_panel *panel = &connector->panel;
 432
 433         return scale(user_level, 0, user_max,
 434                      panel->backlight.min, panel->backlight.max);
 435 }
 436
 437 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 438  * to [hw_min..hw_max]. */
 439 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 440                                    u32 user_level, u32 user_max)
 441 {
 442         struct intel_panel *panel = &connector->panel;
 443         u32 hw_level;
 444
 445         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 446         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 447
 448         return hw_level;
 449 }
 450
 451 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 452 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 453                                    u32 hw_level, u32 user_max)
 454 {
 455         struct intel_panel *panel = &connector->panel;
 456
 457         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 458                      0, user_max);
 459 }
 460
 461 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 462                                           u32 val)
 463 {
 464         struct drm_device *dev = connector->base.dev;
 465         struct drm_i915_private *dev_priv = dev->dev_private;
 466         struct intel_panel *panel = &connector->panel;
 467
 468         WARN_ON(panel->backlight.max == 0);
 469
 470         if (i915.invert_brightness < 0)
 471                 return val;
 472
 473         if (i915.invert_brightness > 0 ||
 474             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 475                 return panel->backlight.max - val;
 476         }
 477
 478         return val;
 479 }
 480
 481 static u32 lpt_get_backlight(struct intel_connector *connector)
 482 {
 483         struct drm_device *dev = connector->base.dev;
 484         struct drm_i915_private *dev_priv = dev->dev_private;
 485
 486         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 487 }
 488
 489 static u32 pch_get_backlight(struct intel_connector *connector)
 490 {
 491         struct drm_device *dev = connector->base.dev;
 492         struct drm_i915_private *dev_priv = dev->dev_private;
 493
 494         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 495 }
 496
 497 static u32 i9xx_get_backlight(struct intel_connector *connector)
 498 {
 499         struct drm_device *dev = connector->base.dev;
 500         struct drm_i915_private *dev_priv = dev->dev_private;
 501         struct intel_panel *panel = &connector->panel;
 502         u32 val;
 503
 504         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 505         if (INTEL_INFO(dev)->gen < 4)
 506                 val >>= 1;
 507
 508         if (panel->backlight.combination_mode) {
 509                 u8 lbpc;
 510
 511                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 512                 val *= lbpc;
 513         }
 514
 515         return val;
 516 }
 517
 518 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 519 {
 520         struct drm_i915_private *dev_priv = dev->dev_private;
 521
 522         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 523                 return 0;
 524
 525         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 526 }
 527
 528 static u32 vlv_get_backlight(struct intel_connector *connector)
 529 {
 530         struct drm_device *dev = connector->base.dev;
 531         enum pipe pipe = intel_get_pipe_from_connector(connector);
 532
 533         return _vlv_get_backlight(dev, pipe);
 534 }
 535
 536 static u32 bxt_get_backlight(struct intel_connector *connector)
 537 {
 538         struct drm_device *dev = connector->base.dev;
 539         struct intel_panel *panel = &connector->panel;
 540         struct drm_i915_private *dev_priv = dev->dev_private;
 541
 542         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 543 }
 544
 545 static u32 pwm_get_backlight(struct intel_connector *connector)
 546 {
 547         struct intel_panel *panel = &connector->panel;
 548         int duty_ns;
 549
 550         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 551         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 552 }
 553
 554 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 555 {
 556         struct drm_device *dev = connector->base.dev;
 557         struct drm_i915_private *dev_priv = dev->dev_private;
 558         struct intel_panel *panel = &connector->panel;
 559         u32 val = 0;
 560
 561         mutex_lock(&dev_priv->backlight_lock);
 562
 563         if (panel->backlight.enabled) {
 564                 val = panel->backlight.get(connector);
 565                 val = intel_panel_compute_brightness(connector, val);
 566         }
 567
 568         mutex_unlock(&dev_priv->backlight_lock);
 569
 570         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 571         return val;
 572 }
 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 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 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 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 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 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 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 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 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         struct intel_connector *connector = bl_get_data(bd);
1140         struct intel_panel *panel = &connector->panel;
1141         struct drm_device *dev = connector->base.dev;
1142
1143         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1144         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1145                       bd->props.brightness, bd->props.max_brightness);
1146         intel_panel_set_backlight(connector, bd->props.brightness,
1147                                   bd->props.max_brightness);
1148
1149         /*
1150          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1151          * backlight class device does not make it easy to to differentiate
1152          * between callbacks for brightness and bl_power, so our backlight_power
1153          * callback needs to take this into account.
1154          */
1155         if (panel->backlight.enabled) {
1156                 if (panel->backlight.power) {
1157                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1158                                 bd->props.brightness != 0;
1159                         panel->backlight.power(connector, enable);
1160                 }
1161         } else {
1162                 bd->props.power = FB_BLANK_POWERDOWN;
1163         }
1164
1165         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1166         return 0;
1167 }
1168
1169 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1170 {
1171         struct intel_connector *connector = bl_get_data(bd);
1172         struct drm_device *dev = connector->base.dev;
1173         struct drm_i915_private *dev_priv = dev->dev_private;
1174         u32 hw_level;
1175         int ret;
1176
1177         intel_runtime_pm_get(dev_priv);
1178         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1179
1180         hw_level = intel_panel_get_backlight(connector);
1181         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1182
1183         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1184         intel_runtime_pm_put(dev_priv);
1185
1186         return ret;
1187 }
1188
1189 static const struct backlight_ops intel_backlight_device_ops = {
1190         .update_status = intel_backlight_device_update_status,
1191         .get_brightness = intel_backlight_device_get_brightness,
1192 };
1193
1194 static int intel_backlight_device_register(struct intel_connector *connector)
1195 {
1196         struct intel_panel *panel = &connector->panel;
1197         struct backlight_properties props;
1198
1199         if (WARN_ON(panel->backlight.device))
1200                 return -ENODEV;
1201
1202         if (!panel->backlight.present)
1203                 return 0;
1204
1205         WARN_ON(panel->backlight.max == 0);
1206
1207         memset(&props, 0, sizeof(props));
1208         props.type = BACKLIGHT_RAW;
1209
1210         /*
1211          * Note: Everything should work even if the backlight device max
1212          * presented to the userspace is arbitrarily chosen.
1213          */
1214         props.max_brightness = panel->backlight.max;
1215         props.brightness = scale_hw_to_user(connector,
1216                                             panel->backlight.level,
1217                                             props.max_brightness);
1218
1219         if (panel->backlight.enabled)
1220                 props.power = FB_BLANK_UNBLANK;
1221         else
1222                 props.power = FB_BLANK_POWERDOWN;
1223
1224         /*
1225          * Note: using the same name independent of the connector prevents
1226          * registration of multiple backlight devices in the driver.
1227          */
1228         panel->backlight.device =
1229                 backlight_device_register("intel_backlight",
1230                                           connector->base.kdev,
1231                                           connector,
1232                                           &intel_backlight_device_ops, &props);
1233
1234         if (IS_ERR(panel->backlight.device)) {
1235                 DRM_ERROR("Failed to register backlight: %ld\n",
1236                           PTR_ERR(panel->backlight.device));
1237                 panel->backlight.device = NULL;
1238                 return -ENODEV;
1239         }
1240
1241         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1242                       connector->base.name);
1243
1244         return 0;
1245 }
1246
1247 static void intel_backlight_device_unregister(struct intel_connector *connector)
1248 {
1249         struct intel_panel *panel = &connector->panel;
1250
1251         if (panel->backlight.device) {
1252                 backlight_device_unregister(panel->backlight.device);
1253                 panel->backlight.device = NULL;
1254         }
1255 }
1256 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1257 static int intel_backlight_device_register(struct intel_connector *connector)
1258 {
1259         return 0;
1260 }
1261 static void intel_backlight_device_unregister(struct intel_connector *connector)
1262 {
1263 }
1264 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1265
1266 /*
1267  * BXT: PWM clock frequency = 19.2 MHz.
1268  */
1269 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1270 {
1271         return KHz(19200) / pwm_freq_hz;
1272 }
1273
1274 /*
1275  * SPT: This value represents the period of the PWM stream in clock periods
1276  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1277  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1278  */
1279 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1280 {
1281         struct drm_device *dev = connector->base.dev;
1282         struct drm_i915_private *dev_priv = dev->dev_private;
1283         u32 mul, clock;
1284
1285         if (I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY)
1286                 mul = 128;
1287         else
1288                 mul = 16;
1289
1290         clock = MHz(24);
1291
1292         return clock / (pwm_freq_hz * mul);
1293 }
1294
1295 /*
1296  * LPT: This value represents the period of the PWM stream in clock periods
1297  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1298  * LPT SOUTH_CHICKEN2 register bit 5).
1299  */
1300 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1301 {
1302         struct drm_device *dev = connector->base.dev;
1303         struct drm_i915_private *dev_priv = dev->dev_private;
1304         u32 mul, clock;
1305
1306         if (I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY)
1307                 mul = 16;
1308         else
1309                 mul = 128;
1310
1311         if (HAS_PCH_LPT_H(dev_priv))
1312                 clock = MHz(135); /* LPT:H */
1313         else
1314                 clock = MHz(24); /* LPT:LP */
1315
1316         return clock / (pwm_freq_hz * mul);
1317 }
1318
1319 /*
1320  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1321  * display raw clocks multiplied by 128.
1322  */
1323 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1324 {
1325         struct drm_device *dev = connector->base.dev;
1326         int clock = MHz(intel_pch_rawclk(dev));
1327
1328         return clock / (pwm_freq_hz * 128);
1329 }
1330
1331 /*
1332  * Gen2: This field determines the number of time base events (display core
1333  * clock frequency/32) in total for a complete cycle of modulated backlight
1334  * control.
1335  *
1336  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1337  * divided by 32.
1338  */
1339 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1340 {
1341         struct drm_device *dev = connector->base.dev;
1342         struct drm_i915_private *dev_priv = dev->dev_private;
1343         int clock;
1344
1345         if (IS_PINEVIEW(dev))
1346                 clock = MHz(intel_hrawclk(dev));
1347         else
1348                 clock = 1000 * dev_priv->cdclk_freq;
1349
1350         return clock / (pwm_freq_hz * 32);
1351 }
1352
1353 /*
1354  * Gen4: This value represents the period of the PWM stream in display core
1355  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1356  *
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;
1363
1364         if (IS_G4X(dev_priv))
1365                 clock = MHz(intel_hrawclk(dev));
1366         else
1367                 clock = 1000 * dev_priv->cdclk_freq;
1368
1369         return clock / (pwm_freq_hz * 128);
1370 }
1371
1372 /*
1373  * VLV: This value represents the period of the PWM stream in display core
1374  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1375  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1376  */
1377 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1378 {
1379         struct drm_device *dev = connector->base.dev;
1380         struct drm_i915_private *dev_priv = dev->dev_private;
1381         int clock;
1382
1383         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1384                 if (IS_CHERRYVIEW(dev))
1385                         return KHz(19200) / (pwm_freq_hz * 16);
1386                 else
1387                         return MHz(25) / (pwm_freq_hz * 16);
1388         } else {
1389                 clock = intel_hrawclk(dev);
1390                 return MHz(clock) / (pwm_freq_hz * 128);
1391         }
1392 }
1393
1394 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1395 {
1396         struct drm_device *dev = connector->base.dev;
1397         struct drm_i915_private *dev_priv = dev->dev_private;
1398         struct intel_panel *panel = &connector->panel;
1399         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1400         u32 pwm;
1401
1402         if (!panel->backlight.hz_to_pwm) {
1403                 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1404                 return 0;
1405         }
1406
1407         if (pwm_freq_hz) {
1408                 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1409                               pwm_freq_hz);
1410         } else {
1411                 pwm_freq_hz = 200;
1412                 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1413                               pwm_freq_hz);
1414         }
1415
1416         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1417         if (!pwm) {
1418                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1419                 return 0;
1420         }
1421
1422         return pwm;
1423 }
1424
1425 /*
1426  * Note: The setup hooks can't assume pipe is set!
1427  */
1428 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1429 {
1430         struct drm_device *dev = connector->base.dev;
1431         struct drm_i915_private *dev_priv = dev->dev_private;
1432         struct intel_panel *panel = &connector->panel;
1433         int min;
1434
1435         WARN_ON(panel->backlight.max == 0);
1436
1437         /*
1438          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1439          * to problems. There are such machines out there. Either our
1440          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1441          * against this by letting the minimum be at most (arbitrarily chosen)
1442          * 25% of the max.
1443          */
1444         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1445         if (min != dev_priv->vbt.backlight.min_brightness) {
1446                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1447                               dev_priv->vbt.backlight.min_brightness, min);
1448         }
1449
1450         /* vbt value is a coefficient in range [0..255] */
1451         return scale(min, 0, 255, 0, panel->backlight.max);
1452 }
1453
1454 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1455 {
1456         struct drm_device *dev = connector->base.dev;
1457         struct drm_i915_private *dev_priv = dev->dev_private;
1458         struct intel_panel *panel = &connector->panel;
1459         u32 pch_ctl1, pch_ctl2, val;
1460
1461         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1462         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1463
1464         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1465         panel->backlight.max = pch_ctl2 >> 16;
1466
1467         if (!panel->backlight.max)
1468                 panel->backlight.max = get_backlight_max_vbt(connector);
1469
1470         if (!panel->backlight.max)
1471                 return -ENODEV;
1472
1473         panel->backlight.min = get_backlight_min_vbt(connector);
1474
1475         val = lpt_get_backlight(connector);
1476         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1477
1478         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1479                 panel->backlight.level != 0;
1480
1481         return 0;
1482 }
1483
1484 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1485 {
1486         struct drm_device *dev = connector->base.dev;
1487         struct drm_i915_private *dev_priv = dev->dev_private;
1488         struct intel_panel *panel = &connector->panel;
1489         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1490
1491         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1492         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1493
1494         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1495         panel->backlight.max = pch_ctl2 >> 16;
1496
1497         if (!panel->backlight.max)
1498                 panel->backlight.max = get_backlight_max_vbt(connector);
1499
1500         if (!panel->backlight.max)
1501                 return -ENODEV;
1502
1503         panel->backlight.min = get_backlight_min_vbt(connector);
1504
1505         val = pch_get_backlight(connector);
1506         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1507
1508         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1509         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1510                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1511
1512         return 0;
1513 }
1514
1515 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1516 {
1517         struct drm_device *dev = connector->base.dev;
1518         struct drm_i915_private *dev_priv = dev->dev_private;
1519         struct intel_panel *panel = &connector->panel;
1520         u32 ctl, val;
1521
1522         ctl = I915_READ(BLC_PWM_CTL);
1523
1524         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1525                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1526
1527         if (IS_PINEVIEW(dev))
1528                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1529
1530         panel->backlight.max = ctl >> 17;
1531
1532         if (!panel->backlight.max) {
1533                 panel->backlight.max = get_backlight_max_vbt(connector);
1534                 panel->backlight.max >>= 1;
1535         }
1536
1537         if (!panel->backlight.max)
1538                 return -ENODEV;
1539
1540         if (panel->backlight.combination_mode)
1541                 panel->backlight.max *= 0xff;
1542
1543         panel->backlight.min = get_backlight_min_vbt(connector);
1544
1545         val = i9xx_get_backlight(connector);
1546         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1547
1548         panel->backlight.enabled = panel->backlight.level != 0;
1549
1550         return 0;
1551 }
1552
1553 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1554 {
1555         struct drm_device *dev = connector->base.dev;
1556         struct drm_i915_private *dev_priv = dev->dev_private;
1557         struct intel_panel *panel = &connector->panel;
1558         u32 ctl, ctl2, val;
1559
1560         ctl2 = I915_READ(BLC_PWM_CTL2);
1561         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1562         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1563
1564         ctl = I915_READ(BLC_PWM_CTL);
1565         panel->backlight.max = ctl >> 16;
1566
1567         if (!panel->backlight.max)
1568                 panel->backlight.max = get_backlight_max_vbt(connector);
1569
1570         if (!panel->backlight.max)
1571                 return -ENODEV;
1572
1573         if (panel->backlight.combination_mode)
1574                 panel->backlight.max *= 0xff;
1575
1576         panel->backlight.min = get_backlight_min_vbt(connector);
1577
1578         val = i9xx_get_backlight(connector);
1579         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1580
1581         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1582                 panel->backlight.level != 0;
1583
1584         return 0;
1585 }
1586
1587 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1588 {
1589         struct drm_device *dev = connector->base.dev;
1590         struct drm_i915_private *dev_priv = dev->dev_private;
1591         struct intel_panel *panel = &connector->panel;
1592         u32 ctl, ctl2, val;
1593
1594         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1595                 return -ENODEV;
1596
1597         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1598         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1599
1600         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1601         panel->backlight.max = ctl >> 16;
1602
1603         if (!panel->backlight.max)
1604                 panel->backlight.max = get_backlight_max_vbt(connector);
1605
1606         if (!panel->backlight.max)
1607                 return -ENODEV;
1608
1609         panel->backlight.min = get_backlight_min_vbt(connector);
1610
1611         val = _vlv_get_backlight(dev, pipe);
1612         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1613
1614         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1615                 panel->backlight.level != 0;
1616
1617         return 0;
1618 }
1619
1620 static int
1621 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1622 {
1623         struct drm_device *dev = connector->base.dev;
1624         struct drm_i915_private *dev_priv = dev->dev_private;
1625         struct intel_panel *panel = &connector->panel;
1626         u32 pwm_ctl, val;
1627
1628         /*
1629          * For BXT hard coding the Backlight controller to 0.
1630          * TODO : Read the controller value from VBT and generalize
1631          */
1632         panel->backlight.controller = 0;
1633
1634         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1635
1636         /* Keeping the check if controller 1 is to be programmed.
1637          * This will come into affect once the VBT parsing
1638          * is fixed for controller selection, and controller 1 is used
1639          * for a prticular display configuration.
1640          */
1641         if (panel->backlight.controller == 1) {
1642                 val = I915_READ(UTIL_PIN_CTL);
1643                 panel->backlight.util_pin_active_low =
1644                                         val & UTIL_PIN_POLARITY;
1645         }
1646
1647         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1648         panel->backlight.max =
1649                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1650
1651         if (!panel->backlight.max)
1652                 panel->backlight.max = get_backlight_max_vbt(connector);
1653
1654         if (!panel->backlight.max)
1655                 return -ENODEV;
1656
1657         val = bxt_get_backlight(connector);
1658         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1659
1660         panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1661                 panel->backlight.level != 0;
1662
1663         return 0;
1664 }
1665
1666 static int pwm_setup_backlight(struct intel_connector *connector,
1667                                enum pipe pipe)
1668 {
1669         struct drm_device *dev = connector->base.dev;
1670         struct intel_panel *panel = &connector->panel;
1671         int retval;
1672
1673         /* Get the PWM chip for backlight control */
1674         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1675         if (IS_ERR(panel->backlight.pwm)) {
1676                 DRM_ERROR("Failed to own the pwm chip\n");
1677                 panel->backlight.pwm = NULL;
1678                 return -ENODEV;
1679         }
1680
1681         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1682                             CRC_PMIC_PWM_PERIOD_NS);
1683         if (retval < 0) {
1684                 DRM_ERROR("Failed to configure the pwm chip\n");
1685                 pwm_put(panel->backlight.pwm);
1686                 panel->backlight.pwm = NULL;
1687                 return retval;
1688         }
1689
1690         panel->backlight.min = 0; /* 0% */
1691         panel->backlight.max = 100; /* 100% */
1692         panel->backlight.level = DIV_ROUND_UP(
1693                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1694                                  CRC_PMIC_PWM_PERIOD_NS);
1695         panel->backlight.enabled = panel->backlight.level != 0;
1696
1697         return 0;
1698 }
1699
1700 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1701 {
1702         struct drm_device *dev = connector->dev;
1703         struct drm_i915_private *dev_priv = dev->dev_private;
1704         struct intel_connector *intel_connector = to_intel_connector(connector);
1705         struct intel_panel *panel = &intel_connector->panel;
1706         int ret;
1707
1708         if (!dev_priv->vbt.backlight.present) {
1709                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1710                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1711                 } else {
1712                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1713                         return 0;
1714                 }
1715         }
1716
1717         /* ensure intel_panel has been initialized first */
1718         if (WARN_ON(!panel->backlight.setup))
1719                 return -ENODEV;
1720
1721         /* set level and max in panel struct */
1722         mutex_lock(&dev_priv->backlight_lock);
1723         ret = panel->backlight.setup(intel_connector, pipe);
1724         mutex_unlock(&dev_priv->backlight_lock);
1725
1726         if (ret) {
1727                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1728                               connector->name);
1729                 return ret;
1730         }
1731
1732         panel->backlight.present = true;
1733
1734         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1735                       connector->name,
1736                       panel->backlight.enabled ? "enabled" : "disabled",
1737                       panel->backlight.level, panel->backlight.max);
1738
1739         return 0;
1740 }
1741
1742 void intel_panel_destroy_backlight(struct drm_connector *connector)
1743 {
1744         struct intel_connector *intel_connector = to_intel_connector(connector);
1745         struct intel_panel *panel = &intel_connector->panel;
1746
1747         /* dispose of the pwm */
1748         if (panel->backlight.pwm)
1749                 pwm_put(panel->backlight.pwm);
1750
1751         panel->backlight.present = false;
1752 }
1753
1754 /* Set up chip specific backlight functions */
1755 static void
1756 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1757 {
1758         struct intel_connector *intel_connector =
1759                 container_of(panel, struct intel_connector, panel);
1760         struct drm_device *dev = intel_connector->base.dev;
1761         struct drm_i915_private *dev_priv = dev->dev_private;
1762
1763         if (IS_BROXTON(dev)) {
1764                 panel->backlight.setup = bxt_setup_backlight;
1765                 panel->backlight.enable = bxt_enable_backlight;
1766                 panel->backlight.disable = bxt_disable_backlight;
1767                 panel->backlight.set = bxt_set_backlight;
1768                 panel->backlight.get = bxt_get_backlight;
1769                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1770         } else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
1771                 panel->backlight.setup = lpt_setup_backlight;
1772                 panel->backlight.enable = lpt_enable_backlight;
1773                 panel->backlight.disable = lpt_disable_backlight;
1774                 panel->backlight.set = lpt_set_backlight;
1775                 panel->backlight.get = lpt_get_backlight;
1776                 if (HAS_PCH_LPT(dev))
1777                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1778                 else
1779                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1780         } else if (HAS_PCH_SPLIT(dev)) {
1781                 panel->backlight.setup = pch_setup_backlight;
1782                 panel->backlight.enable = pch_enable_backlight;
1783                 panel->backlight.disable = pch_disable_backlight;
1784                 panel->backlight.set = pch_set_backlight;
1785                 panel->backlight.get = pch_get_backlight;
1786                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1787         } else if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
1788                 if (dev_priv->vbt.has_mipi) {
1789                         panel->backlight.setup = pwm_setup_backlight;
1790                         panel->backlight.enable = pwm_enable_backlight;
1791                         panel->backlight.disable = pwm_disable_backlight;
1792                         panel->backlight.set = pwm_set_backlight;
1793                         panel->backlight.get = pwm_get_backlight;
1794                 } else {
1795                         panel->backlight.setup = vlv_setup_backlight;
1796                         panel->backlight.enable = vlv_enable_backlight;
1797                         panel->backlight.disable = vlv_disable_backlight;
1798                         panel->backlight.set = vlv_set_backlight;
1799                         panel->backlight.get = vlv_get_backlight;
1800                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1801                 }
1802         } else if (IS_GEN4(dev)) {
1803                 panel->backlight.setup = i965_setup_backlight;
1804                 panel->backlight.enable = i965_enable_backlight;
1805                 panel->backlight.disable = i965_disable_backlight;
1806                 panel->backlight.set = i9xx_set_backlight;
1807                 panel->backlight.get = i9xx_get_backlight;
1808                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1809         } else {
1810                 panel->backlight.setup = i9xx_setup_backlight;
1811                 panel->backlight.enable = i9xx_enable_backlight;
1812                 panel->backlight.disable = i9xx_disable_backlight;
1813                 panel->backlight.set = i9xx_set_backlight;
1814                 panel->backlight.get = i9xx_get_backlight;
1815                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1816         }
1817 }
1818
1819 int intel_panel_init(struct intel_panel *panel,
1820                      struct drm_display_mode *fixed_mode,
1821                      struct drm_display_mode *downclock_mode)
1822 {
1823         intel_panel_init_backlight_funcs(panel);
1824
1825         panel->fixed_mode = fixed_mode;
1826         panel->downclock_mode = downclock_mode;
1827
1828         return 0;
1829 }
1830
1831 void intel_panel_fini(struct intel_panel *panel)
1832 {
1833         struct intel_connector *intel_connector =
1834                 container_of(panel, struct intel_connector, panel);
1835
1836         if (panel->fixed_mode)
1837                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1838
1839         if (panel->downclock_mode)
1840                 drm_mode_destroy(intel_connector->base.dev,
1841                                 panel->downclock_mode);
1842 }
1843
1844 void intel_backlight_register(struct drm_device *dev)
1845 {
1846         struct intel_connector *connector;
1847
1848         for_each_intel_connector(dev, connector)
1849                 intel_backlight_device_register(connector);
1850 }
1851
1852 void intel_backlight_unregister(struct drm_device *dev)
1853 {
1854         struct intel_connector *connector;
1855
1856         for_each_intel_connector(dev, connector)
1857                 intel_backlight_device_unregister(connector);
1858 }