drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <[email protected]>
   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 <[email protected]>
  26  *      Dave Airlie <[email protected]>
  27  *      Jesse Barnes <[email protected]>
  28  *      Chris Wilson <[email protected]>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/kernel.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/pwm.h>
  36 #include "intel_drv.h"
  37
  38 #define CRC_PMIC_PWM_PERIOD_NS  21333
  39
  40 void
  41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  42                        struct drm_display_mode *adjusted_mode)
  43 {
  44         drm_mode_copy(adjusted_mode, fixed_mode);
  45
  46         drm_mode_set_crtcinfo(adjusted_mode, 0);
  47 }
  48
  49 /**
  50  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  51  * @dev_priv: i915 device instance
  52  * @fixed_mode : panel native mode
  53  * @connector: LVDS/eDP connector
  54  *
  55  * Return downclock_avail
  56  * Find the reduced downclock for LVDS/eDP in EDID.
  57  */
  58 struct drm_display_mode *
  59 intel_find_panel_downclock(struct drm_i915_private *dev_priv,
  60                         struct drm_display_mode *fixed_mode,
  61                         struct drm_connector *connector)
  62 {
  63         struct drm_display_mode *scan, *tmp_mode;
  64         int temp_downclock;
  65
  66         temp_downclock = fixed_mode->clock;
  67         tmp_mode = NULL;
  68
  69         list_for_each_entry(scan, &connector->probed_modes, head) {
  70                 /*
  71                  * If one mode has the same resolution with the fixed_panel
  72                  * mode while they have the different refresh rate, it means
  73                  * that the reduced downclock is found. In such
  74                  * case we can set the different FPx0/1 to dynamically select
  75                  * between low and high frequency.
  76                  */
  77                 if (scan->hdisplay == fixed_mode->hdisplay &&
  78                     scan->hsync_start == fixed_mode->hsync_start &&
  79                     scan->hsync_end == fixed_mode->hsync_end &&
  80                     scan->htotal == fixed_mode->htotal &&
  81                     scan->vdisplay == fixed_mode->vdisplay &&
  82                     scan->vsync_start == fixed_mode->vsync_start &&
  83                     scan->vsync_end == fixed_mode->vsync_end &&
  84                     scan->vtotal == fixed_mode->vtotal) {
  85                         if (scan->clock < temp_downclock) {
  86                                 /*
  87                                  * The downclock is already found. But we
  88                                  * expect to find the lower downclock.
  89                                  */
  90                                 temp_downclock = scan->clock;
  91                                 tmp_mode = scan;
  92                         }
  93                 }
  94         }
  95
  96         if (temp_downclock < fixed_mode->clock)
  97                 return drm_mode_duplicate(&dev_priv->drm, tmp_mode);
  98         else
  99                 return NULL;
 100 }
 101
 102 /* adjusted_mode has been preset to be the panel's fixed mode */
 103 void
 104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 105                         struct intel_crtc_state *pipe_config,
 106                         int fitting_mode)
 107 {
 108         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 109         int x = 0, y = 0, width = 0, height = 0;
 110
 111         /* Native modes don't need fitting */
 112         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 113             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
 114             !pipe_config->ycbcr420)
 115                 goto done;
 116
 117         switch (fitting_mode) {
 118         case DRM_MODE_SCALE_CENTER:
 119                 width = pipe_config->pipe_src_w;
 120                 height = pipe_config->pipe_src_h;
 121                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 122                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 123                 break;
 124
 125         case DRM_MODE_SCALE_ASPECT:
 126                 /* Scale but preserve the aspect ratio */
 127                 {
 128                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 129                                 * pipe_config->pipe_src_h;
 130                         u32 scaled_height = pipe_config->pipe_src_w
 131                                 * adjusted_mode->crtc_vdisplay;
 132                         if (scaled_width > scaled_height) { /* pillar */
 133                                 width = scaled_height / pipe_config->pipe_src_h;
 134                                 if (width & 1)
 135                                         width++;
 136                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 137                                 y = 0;
 138                                 height = adjusted_mode->crtc_vdisplay;
 139                         } else if (scaled_width < scaled_height) { /* letter */
 140                                 height = scaled_width / pipe_config->pipe_src_w;
 141                                 if (height & 1)
 142                                     height++;
 143                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 144                                 x = 0;
 145                                 width = adjusted_mode->crtc_hdisplay;
 146                         } else {
 147                                 x = y = 0;
 148                                 width = adjusted_mode->crtc_hdisplay;
 149                                 height = adjusted_mode->crtc_vdisplay;
 150                         }
 151                 }
 152                 break;
 153
 154         case DRM_MODE_SCALE_FULLSCREEN:
 155                 x = y = 0;
 156                 width = adjusted_mode->crtc_hdisplay;
 157                 height = adjusted_mode->crtc_vdisplay;
 158                 break;
 159
 160         default:
 161                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 162                 return;
 163         }
 164
 165 done:
 166         pipe_config->pch_pfit.pos = (x << 16) | y;
 167         pipe_config->pch_pfit.size = (width << 16) | height;
 168         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 169 }
 170
 171 static void
 172 centre_horizontally(struct drm_display_mode *adjusted_mode,
 173                     int width)
 174 {
 175         u32 border, sync_pos, blank_width, sync_width;
 176
 177         /* keep the hsync and hblank widths constant */
 178         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 179         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 180         sync_pos = (blank_width - sync_width + 1) / 2;
 181
 182         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 183         border += border & 1; /* make the border even */
 184
 185         adjusted_mode->crtc_hdisplay = width;
 186         adjusted_mode->crtc_hblank_start = width + border;
 187         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 188
 189         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 190         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 191 }
 192
 193 static void
 194 centre_vertically(struct drm_display_mode *adjusted_mode,
 195                   int height)
 196 {
 197         u32 border, sync_pos, blank_width, sync_width;
 198
 199         /* keep the vsync and vblank widths constant */
 200         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 201         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 202         sync_pos = (blank_width - sync_width + 1) / 2;
 203
 204         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 205
 206         adjusted_mode->crtc_vdisplay = height;
 207         adjusted_mode->crtc_vblank_start = height + border;
 208         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 209
 210         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 211         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 212 }
 213
 214 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 215 {
 216         /*
 217          * Floating point operation is not supported. So the FACTOR
 218          * is defined, which can avoid the floating point computation
 219          * when calculating the panel ratio.
 220          */
 221 #define ACCURACY 12
 222 #define FACTOR (1 << ACCURACY)
 223         u32 ratio = source * FACTOR / target;
 224         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 225 }
 226
 227 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 228                               u32 *pfit_control)
 229 {
 230         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 231         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 232                 pipe_config->pipe_src_h;
 233         u32 scaled_height = pipe_config->pipe_src_w *
 234                 adjusted_mode->crtc_vdisplay;
 235
 236         /* 965+ is easy, it does everything in hw */
 237         if (scaled_width > scaled_height)
 238                 *pfit_control |= PFIT_ENABLE |
 239                         PFIT_SCALING_PILLAR;
 240         else if (scaled_width < scaled_height)
 241                 *pfit_control |= PFIT_ENABLE |
 242                         PFIT_SCALING_LETTER;
 243         else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 244                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 245 }
 246
 247 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 248                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 249                               u32 *border)
 250 {
 251         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 252         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 253                 pipe_config->pipe_src_h;
 254         u32 scaled_height = pipe_config->pipe_src_w *
 255                 adjusted_mode->crtc_vdisplay;
 256         u32 bits;
 257
 258         /*
 259          * For earlier chips we have to calculate the scaling
 260          * ratio by hand and program it into the
 261          * PFIT_PGM_RATIO register
 262          */
 263         if (scaled_width > scaled_height) { /* pillar */
 264                 centre_horizontally(adjusted_mode,
 265                                     scaled_height /
 266                                     pipe_config->pipe_src_h);
 267
 268                 *border = LVDS_BORDER_ENABLE;
 269                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 270                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 271                                                     adjusted_mode->crtc_vdisplay);
 272
 273                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 274                                              bits << PFIT_VERT_SCALE_SHIFT);
 275                         *pfit_control |= (PFIT_ENABLE |
 276                                           VERT_INTERP_BILINEAR |
 277                                           HORIZ_INTERP_BILINEAR);
 278                 }
 279         } else if (scaled_width < scaled_height) { /* letter */
 280                 centre_vertically(adjusted_mode,
 281                                   scaled_width /
 282                                   pipe_config->pipe_src_w);
 283
 284                 *border = LVDS_BORDER_ENABLE;
 285                 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 286                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 287                                                     adjusted_mode->crtc_hdisplay);
 288
 289                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 290                                              bits << PFIT_VERT_SCALE_SHIFT);
 291                         *pfit_control |= (PFIT_ENABLE |
 292                                           VERT_INTERP_BILINEAR |
 293                                           HORIZ_INTERP_BILINEAR);
 294                 }
 295         } else {
 296                 /* Aspects match, Let hw scale both directions */
 297                 *pfit_control |= (PFIT_ENABLE |
 298                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 299                                   VERT_INTERP_BILINEAR |
 300                                   HORIZ_INTERP_BILINEAR);
 301         }
 302 }
 303
 304 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 305                               struct intel_crtc_state *pipe_config,
 306                               int fitting_mode)
 307 {
 308         struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
 309         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 310         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 311
 312         /* Native modes don't need fitting */
 313         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 314             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 315                 goto out;
 316
 317         switch (fitting_mode) {
 318         case DRM_MODE_SCALE_CENTER:
 319                 /*
 320                  * For centered modes, we have to calculate border widths &
 321                  * heights and modify the values programmed into the CRTC.
 322                  */
 323                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 324                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 325                 border = LVDS_BORDER_ENABLE;
 326                 break;
 327         case DRM_MODE_SCALE_ASPECT:
 328                 /* Scale but preserve the aspect ratio */
 329                 if (INTEL_GEN(dev_priv) >= 4)
 330                         i965_scale_aspect(pipe_config, &pfit_control);
 331                 else
 332                         i9xx_scale_aspect(pipe_config, &pfit_control,
 333                                           &pfit_pgm_ratios, &border);
 334                 break;
 335         case DRM_MODE_SCALE_FULLSCREEN:
 336                 /*
 337                  * Full scaling, even if it changes the aspect ratio.
 338                  * Fortunately this is all done for us in hw.
 339                  */
 340                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 341                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 342                         pfit_control |= PFIT_ENABLE;
 343                         if (INTEL_GEN(dev_priv) >= 4)
 344                                 pfit_control |= PFIT_SCALING_AUTO;
 345                         else
 346                                 pfit_control |= (VERT_AUTO_SCALE |
 347                                                  VERT_INTERP_BILINEAR |
 348                                                  HORIZ_AUTO_SCALE |
 349                                                  HORIZ_INTERP_BILINEAR);
 350                 }
 351                 break;
 352         default:
 353                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 354                 return;
 355         }
 356
 357         /* 965+ wants fuzzy fitting */
 358         /* FIXME: handle multiple panels by failing gracefully */
 359         if (INTEL_GEN(dev_priv) >= 4)
 360                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 361                                  PFIT_FILTER_FUZZY);
 362
 363 out:
 364         if ((pfit_control & PFIT_ENABLE) == 0) {
 365                 pfit_control = 0;
 366                 pfit_pgm_ratios = 0;
 367         }
 368
 369         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 370         if (INTEL_GEN(dev_priv) < 4 && pipe_config->pipe_bpp == 18)
 371                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 372
 373         pipe_config->gmch_pfit.control = pfit_control;
 374         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 375         pipe_config->gmch_pfit.lvds_border_bits = border;
 376 }
 377
 378 enum drm_connector_status
 379 intel_panel_detect(struct drm_i915_private *dev_priv)
 380 {
 381         /* Assume that the BIOS does not lie through the OpRegion... */
 382         if (!i915_modparams.panel_ignore_lid && dev_priv->opregion.lid_state) {
 383                 return *dev_priv->opregion.lid_state & 0x1 ?
 384                         connector_status_connected :
 385                         connector_status_disconnected;
 386         }
 387
 388         switch (i915_modparams.panel_ignore_lid) {
 389         case -2:
 390                 return connector_status_connected;
 391         case -1:
 392                 return connector_status_disconnected;
 393         default:
 394                 return connector_status_unknown;
 395         }
 396 }
 397
 398 /**
 399  * scale - scale values from one range to another
 400  * @source_val: value in range [@source_min..@source_max]
 401  * @source_min: minimum legal value for @source_val
 402  * @source_max: maximum legal value for @source_val
 403  * @target_min: corresponding target value for @source_min
 404  * @target_max: corresponding target value for @source_max
 405  *
 406  * Return @source_val in range [@source_min..@source_max] scaled to range
 407  * [@target_min..@target_max].
 408  */
 409 static uint32_t scale(uint32_t source_val,
 410                       uint32_t source_min, uint32_t source_max,
 411                       uint32_t target_min, uint32_t target_max)
 412 {
 413         uint64_t target_val;
 414
 415         WARN_ON(source_min > source_max);
 416         WARN_ON(target_min > target_max);
 417
 418         /* defensive */
 419         source_val = clamp(source_val, source_min, source_max);
 420
 421         /* avoid overflows */
 422         target_val = mul_u32_u32(source_val - source_min,
 423                                  target_max - target_min);
 424         target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
 425         target_val += target_min;
 426
 427         return target_val;
 428 }
 429
 430 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 431 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 432                                    u32 user_level, u32 user_max)
 433 {
 434         struct intel_panel *panel = &connector->panel;
 435
 436         return scale(user_level, 0, user_max,
 437                      panel->backlight.min, panel->backlight.max);
 438 }
 439
 440 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 441  * to [hw_min..hw_max]. */
 442 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 443                                    u32 user_level, u32 user_max)
 444 {
 445         struct intel_panel *panel = &connector->panel;
 446         u32 hw_level;
 447
 448         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 449         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 450
 451         return hw_level;
 452 }
 453
 454 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 455 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 456                                    u32 hw_level, u32 user_max)
 457 {
 458         struct intel_panel *panel = &connector->panel;
 459
 460         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 461                      0, user_max);
 462 }
 463
 464 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 465                                           u32 val)
 466 {
 467         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 468         struct intel_panel *panel = &connector->panel;
 469
 470         WARN_ON(panel->backlight.max == 0);
 471
 472         if (i915_modparams.invert_brightness < 0)
 473                 return val;
 474
 475         if (i915_modparams.invert_brightness > 0 ||
 476             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 477                 return panel->backlight.max - val + panel->backlight.min;
 478         }
 479
 480         return val;
 481 }
 482
 483 static u32 lpt_get_backlight(struct intel_connector *connector)
 484 {
 485         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 486
 487         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 488 }
 489
 490 static u32 pch_get_backlight(struct intel_connector *connector)
 491 {
 492         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 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_i915_private *dev_priv = to_i915(connector->base.dev);
 500         struct intel_panel *panel = &connector->panel;
 501         u32 val;
 502
 503         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 504         if (INTEL_GEN(dev_priv) < 4)
 505                 val >>= 1;
 506
 507         if (panel->backlight.combination_mode) {
 508                 u8 lbpc;
 509
 510                 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
 511                 val *= lbpc;
 512         }
 513
 514         return val;
 515 }
 516
 517 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
 518 {
 519         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 520                 return 0;
 521
 522         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 523 }
 524
 525 static u32 vlv_get_backlight(struct intel_connector *connector)
 526 {
 527         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 528         enum pipe pipe = intel_get_pipe_from_connector(connector);
 529
 530         return _vlv_get_backlight(dev_priv, pipe);
 531 }
 532
 533 static u32 bxt_get_backlight(struct intel_connector *connector)
 534 {
 535         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 536         struct intel_panel *panel = &connector->panel;
 537
 538         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 539 }
 540
 541 static u32 pwm_get_backlight(struct intel_connector *connector)
 542 {
 543         struct intel_panel *panel = &connector->panel;
 544         int duty_ns;
 545
 546         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 547         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 548 }
 549
 550 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 551 {
 552         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 553         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 554
 555         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 556         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 557 }
 558
 559 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 560 {
 561         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 562         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 563         u32 tmp;
 564
 565         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 566         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 567 }
 568
 569 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 570 {
 571         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 572         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 573         struct intel_panel *panel = &connector->panel;
 574         u32 tmp, mask;
 575
 576         WARN_ON(panel->backlight.max == 0);
 577
 578         if (panel->backlight.combination_mode) {
 579                 u8 lbpc;
 580
 581                 lbpc = level * 0xfe / panel->backlight.max + 1;
 582                 level /= lbpc;
 583                 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
 584         }
 585
 586         if (IS_GEN4(dev_priv)) {
 587                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 588         } else {
 589                 level <<= 1;
 590                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 591         }
 592
 593         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 594         I915_WRITE(BLC_PWM_CTL, tmp | level);
 595 }
 596
 597 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 598 {
 599         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 600         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 601         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 602         u32 tmp;
 603
 604         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 605         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 606 }
 607
 608 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 609 {
 610         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 611         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 612         struct intel_panel *panel = &connector->panel;
 613
 614         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 615 }
 616
 617 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 618 {
 619         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 620         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 621
 622         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 623 }
 624
 625 static void
 626 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 627 {
 628         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 629         struct intel_panel *panel = &connector->panel;
 630
 631         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 632
 633         level = intel_panel_compute_brightness(connector, level);
 634         panel->backlight.set(conn_state, level);
 635 }
 636
 637 /* set backlight brightness to level in range [0..max], assuming hw min is
 638  * respected.
 639  */
 640 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 641                                     u32 user_level, u32 user_max)
 642 {
 643         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 644         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 645         struct intel_panel *panel = &connector->panel;
 646         u32 hw_level;
 647
 648         /*
 649          * Lack of crtc may occur during driver init because
 650          * connection_mutex isn't held across the entire backlight
 651          * setup + modeset readout, and the BIOS can issue the
 652          * requests at any time.
 653          */
 654         if (!panel->backlight.present || !conn_state->crtc)
 655                 return;
 656
 657         mutex_lock(&dev_priv->backlight_lock);
 658
 659         WARN_ON(panel->backlight.max == 0);
 660
 661         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 662         panel->backlight.level = hw_level;
 663
 664         if (panel->backlight.device)
 665                 panel->backlight.device->props.brightness =
 666                         scale_hw_to_user(connector,
 667                                          panel->backlight.level,
 668                                          panel->backlight.device->props.max_brightness);
 669
 670         if (panel->backlight.enabled)
 671                 intel_panel_actually_set_backlight(conn_state, hw_level);
 672
 673         mutex_unlock(&dev_priv->backlight_lock);
 674 }
 675
 676 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
 677 {
 678         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 679         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 680         u32 tmp;
 681
 682         intel_panel_actually_set_backlight(old_conn_state, 0);
 683
 684         /*
 685          * Although we don't support or enable CPU PWM with LPT/SPT based
 686          * systems, it may have been enabled prior to loading the
 687          * driver. Disable to avoid warnings on LCPLL disable.
 688          *
 689          * This needs rework if we need to add support for CPU PWM on PCH split
 690          * platforms.
 691          */
 692         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 693         if (tmp & BLM_PWM_ENABLE) {
 694                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
 695                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 696         }
 697
 698         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 699         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 700 }
 701
 702 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
 703 {
 704         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 705         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 706         u32 tmp;
 707
 708         intel_panel_actually_set_backlight(old_conn_state, 0);
 709
 710         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 711         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 712
 713         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 714         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 715 }
 716
 717 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
 718 {
 719         intel_panel_actually_set_backlight(old_conn_state, 0);
 720 }
 721
 722 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
 723 {
 724         struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 725         u32 tmp;
 726
 727         intel_panel_actually_set_backlight(old_conn_state, 0);
 728
 729         tmp = I915_READ(BLC_PWM_CTL2);
 730         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 731 }
 732
 733 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
 734 {
 735         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 736         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 737         enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 738         u32 tmp;
 739
 740         intel_panel_actually_set_backlight(old_conn_state, 0);
 741
 742         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 743         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 744 }
 745
 746 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
 747 {
 748         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 749         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 750         struct intel_panel *panel = &connector->panel;
 751         u32 tmp, val;
 752
 753         intel_panel_actually_set_backlight(old_conn_state, 0);
 754
 755         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 756         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 757                         tmp & ~BXT_BLC_PWM_ENABLE);
 758
 759         if (panel->backlight.controller == 1) {
 760                 val = I915_READ(UTIL_PIN_CTL);
 761                 val &= ~UTIL_PIN_ENABLE;
 762                 I915_WRITE(UTIL_PIN_CTL, val);
 763         }
 764 }
 765
 766 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
 767 {
 768         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 769         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 770         struct intel_panel *panel = &connector->panel;
 771         u32 tmp;
 772
 773         intel_panel_actually_set_backlight(old_conn_state, 0);
 774
 775         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 776         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 777                    tmp & ~BXT_BLC_PWM_ENABLE);
 778 }
 779
 780 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
 781 {
 782         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 783         struct intel_panel *panel = &connector->panel;
 784
 785         /* Disable the backlight */
 786         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 787         usleep_range(2000, 3000);
 788         pwm_disable(panel->backlight.pwm);
 789 }
 790
 791 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
 792 {
 793         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 794         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 795         struct intel_panel *panel = &connector->panel;
 796
 797         if (!panel->backlight.present)
 798                 return;
 799
 800         /*
 801          * Do not disable backlight on the vga_switcheroo path. When switching
 802          * away from i915, the other client may depend on i915 to handle the
 803          * backlight. This will leave the backlight on unnecessarily when
 804          * another client is not activated.
 805          */
 806         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 807                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 808                 return;
 809         }
 810
 811         mutex_lock(&dev_priv->backlight_lock);
 812
 813         if (panel->backlight.device)
 814                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 815         panel->backlight.enabled = false;
 816         panel->backlight.disable(old_conn_state);
 817
 818         mutex_unlock(&dev_priv->backlight_lock);
 819 }
 820
 821 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 822                                  const struct drm_connector_state *conn_state)
 823 {
 824         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 825         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 826         struct intel_panel *panel = &connector->panel;
 827         u32 pch_ctl1, pch_ctl2, schicken;
 828
 829         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 830         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 831                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 832                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 833                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 834         }
 835
 836         if (HAS_PCH_LPT(dev_priv)) {
 837                 schicken = I915_READ(SOUTH_CHICKEN2);
 838                 if (panel->backlight.alternate_pwm_increment)
 839                         schicken |= LPT_PWM_GRANULARITY;
 840                 else
 841                         schicken &= ~LPT_PWM_GRANULARITY;
 842                 I915_WRITE(SOUTH_CHICKEN2, schicken);
 843         } else {
 844                 schicken = I915_READ(SOUTH_CHICKEN1);
 845                 if (panel->backlight.alternate_pwm_increment)
 846                         schicken |= SPT_PWM_GRANULARITY;
 847                 else
 848                         schicken &= ~SPT_PWM_GRANULARITY;
 849                 I915_WRITE(SOUTH_CHICKEN1, schicken);
 850         }
 851
 852         pch_ctl2 = panel->backlight.max << 16;
 853         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 854
 855         pch_ctl1 = 0;
 856         if (panel->backlight.active_low_pwm)
 857                 pch_ctl1 |= BLM_PCH_POLARITY;
 858
 859         /* After LPT, override is the default. */
 860         if (HAS_PCH_LPT(dev_priv))
 861                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 862
 863         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 864         POSTING_READ(BLC_PWM_PCH_CTL1);
 865         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 866
 867         /* This won't stick until the above enable. */
 868         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 869 }
 870
 871 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 872                                  const struct drm_connector_state *conn_state)
 873 {
 874         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 875         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 876         struct intel_panel *panel = &connector->panel;
 877         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 878         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 879
 880         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 881         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 882                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 883                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 884                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 885         }
 886
 887         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 888         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 889                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 890                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 891                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 892         }
 893
 894         if (cpu_transcoder == TRANSCODER_EDP)
 895                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 896         else
 897                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 898         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 899         POSTING_READ(BLC_PWM_CPU_CTL2);
 900         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 901
 902         /* This won't stick until the above enable. */
 903         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 904
 905         pch_ctl2 = panel->backlight.max << 16;
 906         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 907
 908         pch_ctl1 = 0;
 909         if (panel->backlight.active_low_pwm)
 910                 pch_ctl1 |= BLM_PCH_POLARITY;
 911
 912         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 913         POSTING_READ(BLC_PWM_PCH_CTL1);
 914         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 915 }
 916
 917 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
 918                                   const struct drm_connector_state *conn_state)
 919 {
 920         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 921         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 922         struct intel_panel *panel = &connector->panel;
 923         u32 ctl, freq;
 924
 925         ctl = I915_READ(BLC_PWM_CTL);
 926         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 927                 DRM_DEBUG_KMS("backlight already enabled\n");
 928                 I915_WRITE(BLC_PWM_CTL, 0);
 929         }
 930
 931         freq = panel->backlight.max;
 932         if (panel->backlight.combination_mode)
 933                 freq /= 0xff;
 934
 935         ctl = freq << 17;
 936         if (panel->backlight.combination_mode)
 937                 ctl |= BLM_LEGACY_MODE;
 938         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
 939                 ctl |= BLM_POLARITY_PNV;
 940
 941         I915_WRITE(BLC_PWM_CTL, ctl);
 942         POSTING_READ(BLC_PWM_CTL);
 943
 944         /* XXX: combine this into above write? */
 945         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 946
 947         /*
 948          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 949          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 950          * that has backlight.
 951          */
 952         if (IS_GEN2(dev_priv))
 953                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 954 }
 955
 956 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
 957                                   const struct drm_connector_state *conn_state)
 958 {
 959         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 960         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 961         struct intel_panel *panel = &connector->panel;
 962         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 963         u32 ctl, ctl2, freq;
 964
 965         ctl2 = I915_READ(BLC_PWM_CTL2);
 966         if (ctl2 & BLM_PWM_ENABLE) {
 967                 DRM_DEBUG_KMS("backlight already enabled\n");
 968                 ctl2 &= ~BLM_PWM_ENABLE;
 969                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 970         }
 971
 972         freq = panel->backlight.max;
 973         if (panel->backlight.combination_mode)
 974                 freq /= 0xff;
 975
 976         ctl = freq << 16;
 977         I915_WRITE(BLC_PWM_CTL, ctl);
 978
 979         ctl2 = BLM_PIPE(pipe);
 980         if (panel->backlight.combination_mode)
 981                 ctl2 |= BLM_COMBINATION_MODE;
 982         if (panel->backlight.active_low_pwm)
 983                 ctl2 |= BLM_POLARITY_I965;
 984         I915_WRITE(BLC_PWM_CTL2, ctl2);
 985         POSTING_READ(BLC_PWM_CTL2);
 986         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 987
 988         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 989 }
 990
 991 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
 992                                  const struct drm_connector_state *conn_state)
 993 {
 994         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 995         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 996         struct intel_panel *panel = &connector->panel;
 997         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
 998         u32 ctl, ctl2;
 999
1000         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1001         if (ctl2 & BLM_PWM_ENABLE) {
1002                 DRM_DEBUG_KMS("backlight already enabled\n");
1003                 ctl2 &= ~BLM_PWM_ENABLE;
1004                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1005         }
1006
1007         ctl = panel->backlight.max << 16;
1008         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1009
1010         /* XXX: combine this into above write? */
1011         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1012
1013         ctl2 = 0;
1014         if (panel->backlight.active_low_pwm)
1015                 ctl2 |= BLM_POLARITY_I965;
1016         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1017         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1018         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1019 }
1020
1021 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1022                                  const struct drm_connector_state *conn_state)
1023 {
1024         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1025         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1026         struct intel_panel *panel = &connector->panel;
1027         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1028         u32 pwm_ctl, val;
1029
1030         /* Controller 1 uses the utility pin. */
1031         if (panel->backlight.controller == 1) {
1032                 val = I915_READ(UTIL_PIN_CTL);
1033                 if (val & UTIL_PIN_ENABLE) {
1034                         DRM_DEBUG_KMS("util pin already enabled\n");
1035                         val &= ~UTIL_PIN_ENABLE;
1036                         I915_WRITE(UTIL_PIN_CTL, val);
1037                 }
1038
1039                 val = 0;
1040                 if (panel->backlight.util_pin_active_low)
1041                         val |= UTIL_PIN_POLARITY;
1042                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1043                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1044         }
1045
1046         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1047         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1048                 DRM_DEBUG_KMS("backlight already enabled\n");
1049                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1050                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1051                                 pwm_ctl);
1052         }
1053
1054         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1055                         panel->backlight.max);
1056
1057         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1058
1059         pwm_ctl = 0;
1060         if (panel->backlight.active_low_pwm)
1061                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1062
1063         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1064         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1065         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1066                         pwm_ctl | BXT_BLC_PWM_ENABLE);
1067 }
1068
1069 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1070                                  const struct drm_connector_state *conn_state)
1071 {
1072         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1073         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1074         struct intel_panel *panel = &connector->panel;
1075         u32 pwm_ctl;
1076
1077         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1078         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1079                 DRM_DEBUG_KMS("backlight already enabled\n");
1080                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1081                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1082                            pwm_ctl);
1083         }
1084
1085         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1086                    panel->backlight.max);
1087
1088         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1089
1090         pwm_ctl = 0;
1091         if (panel->backlight.active_low_pwm)
1092                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1093
1094         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1095         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1096         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1097                    pwm_ctl | BXT_BLC_PWM_ENABLE);
1098 }
1099
1100 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1101                                  const struct drm_connector_state *conn_state)
1102 {
1103         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1104         struct intel_panel *panel = &connector->panel;
1105
1106         pwm_enable(panel->backlight.pwm);
1107         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1108 }
1109
1110 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1111                                   const struct drm_connector_state *conn_state)
1112 {
1113         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1114         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1115         struct intel_panel *panel = &connector->panel;
1116         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1117
1118         if (!panel->backlight.present)
1119                 return;
1120
1121         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1122
1123         mutex_lock(&dev_priv->backlight_lock);
1124
1125         WARN_ON(panel->backlight.max == 0);
1126
1127         if (panel->backlight.level <= panel->backlight.min) {
1128                 panel->backlight.level = panel->backlight.max;
1129                 if (panel->backlight.device)
1130                         panel->backlight.device->props.brightness =
1131                                 scale_hw_to_user(connector,
1132                                                  panel->backlight.level,
1133                                                  panel->backlight.device->props.max_brightness);
1134         }
1135
1136         panel->backlight.enable(crtc_state, conn_state);
1137         panel->backlight.enabled = true;
1138         if (panel->backlight.device)
1139                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1140
1141         mutex_unlock(&dev_priv->backlight_lock);
1142 }
1143
1144 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1145 static u32 intel_panel_get_backlight(struct intel_connector *connector)
1146 {
1147         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1148         struct intel_panel *panel = &connector->panel;
1149         u32 val = 0;
1150
1151         mutex_lock(&dev_priv->backlight_lock);
1152
1153         if (panel->backlight.enabled) {
1154                 val = panel->backlight.get(connector);
1155                 val = intel_panel_compute_brightness(connector, val);
1156         }
1157
1158         mutex_unlock(&dev_priv->backlight_lock);
1159
1160         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
1161         return val;
1162 }
1163
1164 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
1165 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1166                                       u32 user_level, u32 user_max)
1167 {
1168         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1169         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1170         struct intel_panel *panel = &connector->panel;
1171         u32 hw_level;
1172
1173         if (!panel->backlight.present)
1174                 return;
1175
1176         mutex_lock(&dev_priv->backlight_lock);
1177
1178         WARN_ON(panel->backlight.max == 0);
1179
1180         hw_level = scale_user_to_hw(connector, user_level, user_max);
1181         panel->backlight.level = hw_level;
1182
1183         if (panel->backlight.enabled)
1184                 intel_panel_actually_set_backlight(conn_state, hw_level);
1185
1186         mutex_unlock(&dev_priv->backlight_lock);
1187 }
1188
1189 static int intel_backlight_device_update_status(struct backlight_device *bd)
1190 {
1191         struct intel_connector *connector = bl_get_data(bd);
1192         struct intel_panel *panel = &connector->panel;
1193         struct drm_device *dev = connector->base.dev;
1194
1195         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1196         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1197                       bd->props.brightness, bd->props.max_brightness);
1198         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1199                                   bd->props.max_brightness);
1200
1201         /*
1202          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1203          * backlight class device does not make it easy to to differentiate
1204          * between callbacks for brightness and bl_power, so our backlight_power
1205          * callback needs to take this into account.
1206          */
1207         if (panel->backlight.enabled) {
1208                 if (panel->backlight.power) {
1209                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1210                                 bd->props.brightness != 0;
1211                         panel->backlight.power(connector, enable);
1212                 }
1213         } else {
1214                 bd->props.power = FB_BLANK_POWERDOWN;
1215         }
1216
1217         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1218         return 0;
1219 }
1220
1221 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1222 {
1223         struct intel_connector *connector = bl_get_data(bd);
1224         struct drm_device *dev = connector->base.dev;
1225         struct drm_i915_private *dev_priv = to_i915(dev);
1226         u32 hw_level;
1227         int ret;
1228
1229         intel_runtime_pm_get(dev_priv);
1230         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1231
1232         hw_level = intel_panel_get_backlight(connector);
1233         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1234
1235         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1236         intel_runtime_pm_put(dev_priv);
1237
1238         return ret;
1239 }
1240
1241 static const struct backlight_ops intel_backlight_device_ops = {
1242         .update_status = intel_backlight_device_update_status,
1243         .get_brightness = intel_backlight_device_get_brightness,
1244 };
1245
1246 int intel_backlight_device_register(struct intel_connector *connector)
1247 {
1248         struct intel_panel *panel = &connector->panel;
1249         struct backlight_properties props;
1250
1251         if (WARN_ON(panel->backlight.device))
1252                 return -ENODEV;
1253
1254         if (!panel->backlight.present)
1255                 return 0;
1256
1257         WARN_ON(panel->backlight.max == 0);
1258
1259         memset(&props, 0, sizeof(props));
1260         props.type = BACKLIGHT_RAW;
1261
1262         /*
1263          * Note: Everything should work even if the backlight device max
1264          * presented to the userspace is arbitrarily chosen.
1265          */
1266         props.max_brightness = panel->backlight.max;
1267         props.brightness = scale_hw_to_user(connector,
1268                                             panel->backlight.level,
1269                                             props.max_brightness);
1270
1271         if (panel->backlight.enabled)
1272                 props.power = FB_BLANK_UNBLANK;
1273         else
1274                 props.power = FB_BLANK_POWERDOWN;
1275
1276         /*
1277          * Note: using the same name independent of the connector prevents
1278          * registration of multiple backlight devices in the driver.
1279          */
1280         panel->backlight.device =
1281                 backlight_device_register("intel_backlight",
1282                                           connector->base.kdev,
1283                                           connector,
1284                                           &intel_backlight_device_ops, &props);
1285
1286         if (IS_ERR(panel->backlight.device)) {
1287                 DRM_ERROR("Failed to register backlight: %ld\n",
1288                           PTR_ERR(panel->backlight.device));
1289                 panel->backlight.device = NULL;
1290                 return -ENODEV;
1291         }
1292
1293         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1294                       connector->base.name);
1295
1296         return 0;
1297 }
1298
1299 void intel_backlight_device_unregister(struct intel_connector *connector)
1300 {
1301         struct intel_panel *panel = &connector->panel;
1302
1303         if (panel->backlight.device) {
1304                 backlight_device_unregister(panel->backlight.device);
1305                 panel->backlight.device = NULL;
1306         }
1307 }
1308 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1309
1310 /*
1311  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1312  *      PWM increment = 1
1313  */
1314 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1315 {
1316         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1317
1318         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1319 }
1320
1321 /*
1322  * BXT: PWM clock frequency = 19.2 MHz.
1323  */
1324 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1325 {
1326         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1327 }
1328
1329 /*
1330  * SPT: This value represents the period of the PWM stream in clock periods
1331  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1332  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1333  */
1334 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1335 {
1336         struct intel_panel *panel = &connector->panel;
1337         u32 mul;
1338
1339         if (panel->backlight.alternate_pwm_increment)
1340                 mul = 128;
1341         else
1342                 mul = 16;
1343
1344         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1345 }
1346
1347 /*
1348  * LPT: This value represents the period of the PWM stream in clock periods
1349  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1350  * LPT SOUTH_CHICKEN2 register bit 5).
1351  */
1352 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1353 {
1354         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1355         struct intel_panel *panel = &connector->panel;
1356         u32 mul, clock;
1357
1358         if (panel->backlight.alternate_pwm_increment)
1359                 mul = 16;
1360         else
1361                 mul = 128;
1362
1363         if (HAS_PCH_LPT_H(dev_priv))
1364                 clock = MHz(135); /* LPT:H */
1365         else
1366                 clock = MHz(24); /* LPT:LP */
1367
1368         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1369 }
1370
1371 /*
1372  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1373  * display raw clocks multiplied by 128.
1374  */
1375 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1376 {
1377         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1378
1379         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1380 }
1381
1382 /*
1383  * Gen2: This field determines the number of time base events (display core
1384  * clock frequency/32) in total for a complete cycle of modulated backlight
1385  * control.
1386  *
1387  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1388  * divided by 32.
1389  */
1390 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1391 {
1392         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1393         int clock;
1394
1395         if (IS_PINEVIEW(dev_priv))
1396                 clock = KHz(dev_priv->rawclk_freq);
1397         else
1398                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1399
1400         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1401 }
1402
1403 /*
1404  * Gen4: This value represents the period of the PWM stream in display core
1405  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1406  *
1407  */
1408 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1409 {
1410         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1411         int clock;
1412
1413         if (IS_G4X(dev_priv))
1414                 clock = KHz(dev_priv->rawclk_freq);
1415         else
1416                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1417
1418         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1419 }
1420
1421 /*
1422  * VLV: This value represents the period of the PWM stream in display core
1423  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1424  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1425  */
1426 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1427 {
1428         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1429         int mul, clock;
1430
1431         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1432                 if (IS_CHERRYVIEW(dev_priv))
1433                         clock = KHz(19200);
1434                 else
1435                         clock = MHz(25);
1436                 mul = 16;
1437         } else {
1438                 clock = KHz(dev_priv->rawclk_freq);
1439                 mul = 128;
1440         }
1441
1442         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1443 }
1444
1445 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1446 {
1447         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1448         struct intel_panel *panel = &connector->panel;
1449         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1450         u32 pwm;
1451
1452         if (!panel->backlight.hz_to_pwm) {
1453                 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1454                 return 0;
1455         }
1456
1457         if (pwm_freq_hz) {
1458                 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1459                               pwm_freq_hz);
1460         } else {
1461                 pwm_freq_hz = 200;
1462                 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1463                               pwm_freq_hz);
1464         }
1465
1466         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1467         if (!pwm) {
1468                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1469                 return 0;
1470         }
1471
1472         return pwm;
1473 }
1474
1475 /*
1476  * Note: The setup hooks can't assume pipe is set!
1477  */
1478 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1479 {
1480         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1481         struct intel_panel *panel = &connector->panel;
1482         int min;
1483
1484         WARN_ON(panel->backlight.max == 0);
1485
1486         /*
1487          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1488          * to problems. There are such machines out there. Either our
1489          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1490          * against this by letting the minimum be at most (arbitrarily chosen)
1491          * 25% of the max.
1492          */
1493         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1494         if (min != dev_priv->vbt.backlight.min_brightness) {
1495                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1496                               dev_priv->vbt.backlight.min_brightness, min);
1497         }
1498
1499         /* vbt value is a coefficient in range [0..255] */
1500         return scale(min, 0, 255, 0, panel->backlight.max);
1501 }
1502
1503 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1504 {
1505         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1506         struct intel_panel *panel = &connector->panel;
1507         u32 pch_ctl1, pch_ctl2, val;
1508         bool alt;
1509
1510         if (HAS_PCH_LPT(dev_priv))
1511                 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1512         else
1513                 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1514         panel->backlight.alternate_pwm_increment = alt;
1515
1516         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1517         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1518
1519         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1520         panel->backlight.max = pch_ctl2 >> 16;
1521
1522         if (!panel->backlight.max)
1523                 panel->backlight.max = get_backlight_max_vbt(connector);
1524
1525         if (!panel->backlight.max)
1526                 return -ENODEV;
1527
1528         panel->backlight.min = get_backlight_min_vbt(connector);
1529
1530         val = lpt_get_backlight(connector);
1531         val = intel_panel_compute_brightness(connector, val);
1532         panel->backlight.level = clamp(val, panel->backlight.min,
1533                                        panel->backlight.max);
1534
1535         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1536
1537         return 0;
1538 }
1539
1540 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1541 {
1542         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1543         struct intel_panel *panel = &connector->panel;
1544         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1545
1546         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1547         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1548
1549         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1550         panel->backlight.max = pch_ctl2 >> 16;
1551
1552         if (!panel->backlight.max)
1553                 panel->backlight.max = get_backlight_max_vbt(connector);
1554
1555         if (!panel->backlight.max)
1556                 return -ENODEV;
1557
1558         panel->backlight.min = get_backlight_min_vbt(connector);
1559
1560         val = pch_get_backlight(connector);
1561         val = intel_panel_compute_brightness(connector, val);
1562         panel->backlight.level = clamp(val, panel->backlight.min,
1563                                        panel->backlight.max);
1564
1565         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1566         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1567                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1568
1569         return 0;
1570 }
1571
1572 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1573 {
1574         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1575         struct intel_panel *panel = &connector->panel;
1576         u32 ctl, val;
1577
1578         ctl = I915_READ(BLC_PWM_CTL);
1579
1580         if (IS_GEN2(dev_priv) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1581                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1582
1583         if (IS_PINEVIEW(dev_priv))
1584                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1585
1586         panel->backlight.max = ctl >> 17;
1587
1588         if (!panel->backlight.max) {
1589                 panel->backlight.max = get_backlight_max_vbt(connector);
1590                 panel->backlight.max >>= 1;
1591         }
1592
1593         if (!panel->backlight.max)
1594                 return -ENODEV;
1595
1596         if (panel->backlight.combination_mode)
1597                 panel->backlight.max *= 0xff;
1598
1599         panel->backlight.min = get_backlight_min_vbt(connector);
1600
1601         val = i9xx_get_backlight(connector);
1602         val = intel_panel_compute_brightness(connector, val);
1603         panel->backlight.level = clamp(val, panel->backlight.min,
1604                                        panel->backlight.max);
1605
1606         panel->backlight.enabled = val != 0;
1607
1608         return 0;
1609 }
1610
1611 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1612 {
1613         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1614         struct intel_panel *panel = &connector->panel;
1615         u32 ctl, ctl2, val;
1616
1617         ctl2 = I915_READ(BLC_PWM_CTL2);
1618         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1619         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1620
1621         ctl = I915_READ(BLC_PWM_CTL);
1622         panel->backlight.max = ctl >> 16;
1623
1624         if (!panel->backlight.max)
1625                 panel->backlight.max = get_backlight_max_vbt(connector);
1626
1627         if (!panel->backlight.max)
1628                 return -ENODEV;
1629
1630         if (panel->backlight.combination_mode)
1631                 panel->backlight.max *= 0xff;
1632
1633         panel->backlight.min = get_backlight_min_vbt(connector);
1634
1635         val = i9xx_get_backlight(connector);
1636         val = intel_panel_compute_brightness(connector, val);
1637         panel->backlight.level = clamp(val, panel->backlight.min,
1638                                        panel->backlight.max);
1639
1640         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1641
1642         return 0;
1643 }
1644
1645 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1646 {
1647         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1648         struct intel_panel *panel = &connector->panel;
1649         u32 ctl, ctl2, val;
1650
1651         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1652                 return -ENODEV;
1653
1654         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1655         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1656
1657         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1658         panel->backlight.max = ctl >> 16;
1659
1660         if (!panel->backlight.max)
1661                 panel->backlight.max = get_backlight_max_vbt(connector);
1662
1663         if (!panel->backlight.max)
1664                 return -ENODEV;
1665
1666         panel->backlight.min = get_backlight_min_vbt(connector);
1667
1668         val = _vlv_get_backlight(dev_priv, pipe);
1669         val = intel_panel_compute_brightness(connector, val);
1670         panel->backlight.level = clamp(val, panel->backlight.min,
1671                                        panel->backlight.max);
1672
1673         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1674
1675         return 0;
1676 }
1677
1678 static int
1679 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1680 {
1681         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1682         struct intel_panel *panel = &connector->panel;
1683         u32 pwm_ctl, val;
1684
1685         panel->backlight.controller = dev_priv->vbt.backlight.controller;
1686
1687         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1688
1689         /* Controller 1 uses the utility pin. */
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         panel->backlight.min = get_backlight_min_vbt(connector);
1707
1708         val = bxt_get_backlight(connector);
1709         val = intel_panel_compute_brightness(connector, val);
1710         panel->backlight.level = clamp(val, panel->backlight.min,
1711                                        panel->backlight.max);
1712
1713         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1714
1715         return 0;
1716 }
1717
1718 static int
1719 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1720 {
1721         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1722         struct intel_panel *panel = &connector->panel;
1723         u32 pwm_ctl, val;
1724
1725         /*
1726          * CNP has the BXT implementation of backlight, but with only one
1727          * controller. TODO: ICP has multiple controllers but we only use
1728          * controller 0 for now.
1729          */
1730         panel->backlight.controller = 0;
1731
1732         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1733
1734         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1735         panel->backlight.max =
1736                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1737
1738         if (!panel->backlight.max)
1739                 panel->backlight.max = get_backlight_max_vbt(connector);
1740
1741         if (!panel->backlight.max)
1742                 return -ENODEV;
1743
1744         panel->backlight.min = get_backlight_min_vbt(connector);
1745
1746         val = bxt_get_backlight(connector);
1747         val = intel_panel_compute_brightness(connector, val);
1748         panel->backlight.level = clamp(val, panel->backlight.min,
1749                                        panel->backlight.max);
1750
1751         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1752
1753         return 0;
1754 }
1755
1756 static int pwm_setup_backlight(struct intel_connector *connector,
1757                                enum pipe pipe)
1758 {
1759         struct drm_device *dev = connector->base.dev;
1760         struct intel_panel *panel = &connector->panel;
1761         int retval;
1762
1763         /* Get the PWM chip for backlight control */
1764         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1765         if (IS_ERR(panel->backlight.pwm)) {
1766                 DRM_ERROR("Failed to own the pwm chip\n");
1767                 panel->backlight.pwm = NULL;
1768                 return -ENODEV;
1769         }
1770
1771         /*
1772          * FIXME: pwm_apply_args() should be removed when switching to
1773          * the atomic PWM API.
1774          */
1775         pwm_apply_args(panel->backlight.pwm);
1776
1777         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1778                             CRC_PMIC_PWM_PERIOD_NS);
1779         if (retval < 0) {
1780                 DRM_ERROR("Failed to configure the pwm chip\n");
1781                 pwm_put(panel->backlight.pwm);
1782                 panel->backlight.pwm = NULL;
1783                 return retval;
1784         }
1785
1786         panel->backlight.min = 0; /* 0% */
1787         panel->backlight.max = 100; /* 100% */
1788         panel->backlight.level = DIV_ROUND_UP(
1789                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1790                                  CRC_PMIC_PWM_PERIOD_NS);
1791         panel->backlight.enabled = panel->backlight.level != 0;
1792
1793         return 0;
1794 }
1795
1796 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1797 {
1798         struct drm_i915_private *dev_priv = to_i915(connector->dev);
1799         struct intel_connector *intel_connector = to_intel_connector(connector);
1800         struct intel_panel *panel = &intel_connector->panel;
1801         int ret;
1802
1803         if (!dev_priv->vbt.backlight.present) {
1804                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1805                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1806                 } else {
1807                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1808                         return 0;
1809                 }
1810         }
1811
1812         /* ensure intel_panel has been initialized first */
1813         if (WARN_ON(!panel->backlight.setup))
1814                 return -ENODEV;
1815
1816         /* set level and max in panel struct */
1817         mutex_lock(&dev_priv->backlight_lock);
1818         ret = panel->backlight.setup(intel_connector, pipe);
1819         mutex_unlock(&dev_priv->backlight_lock);
1820
1821         if (ret) {
1822                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1823                               connector->name);
1824                 return ret;
1825         }
1826
1827         panel->backlight.present = true;
1828
1829         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1830                       connector->name,
1831                       enableddisabled(panel->backlight.enabled),
1832                       panel->backlight.level, panel->backlight.max);
1833
1834         return 0;
1835 }
1836
1837 void intel_panel_destroy_backlight(struct drm_connector *connector)
1838 {
1839         struct intel_connector *intel_connector = to_intel_connector(connector);
1840         struct intel_panel *panel = &intel_connector->panel;
1841
1842         /* dispose of the pwm */
1843         if (panel->backlight.pwm)
1844                 pwm_put(panel->backlight.pwm);
1845
1846         panel->backlight.present = false;
1847 }
1848
1849 /* Set up chip specific backlight functions */
1850 static void
1851 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1852 {
1853         struct intel_connector *connector =
1854                 container_of(panel, struct intel_connector, panel);
1855         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1856
1857         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1858             intel_dp_aux_init_backlight_funcs(connector) == 0)
1859                 return;
1860
1861         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1862             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1863                 return;
1864
1865         if (IS_GEN9_LP(dev_priv)) {
1866                 panel->backlight.setup = bxt_setup_backlight;
1867                 panel->backlight.enable = bxt_enable_backlight;
1868                 panel->backlight.disable = bxt_disable_backlight;
1869                 panel->backlight.set = bxt_set_backlight;
1870                 panel->backlight.get = bxt_get_backlight;
1871                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1872         } else if (HAS_PCH_CNP(dev_priv) || HAS_PCH_ICP(dev_priv)) {
1873                 panel->backlight.setup = cnp_setup_backlight;
1874                 panel->backlight.enable = cnp_enable_backlight;
1875                 panel->backlight.disable = cnp_disable_backlight;
1876                 panel->backlight.set = bxt_set_backlight;
1877                 panel->backlight.get = bxt_get_backlight;
1878                 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1879         } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
1880                    HAS_PCH_KBP(dev_priv)) {
1881                 panel->backlight.setup = lpt_setup_backlight;
1882                 panel->backlight.enable = lpt_enable_backlight;
1883                 panel->backlight.disable = lpt_disable_backlight;
1884                 panel->backlight.set = lpt_set_backlight;
1885                 panel->backlight.get = lpt_get_backlight;
1886                 if (HAS_PCH_LPT(dev_priv))
1887                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1888                 else
1889                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1890         } else if (HAS_PCH_SPLIT(dev_priv)) {
1891                 panel->backlight.setup = pch_setup_backlight;
1892                 panel->backlight.enable = pch_enable_backlight;
1893                 panel->backlight.disable = pch_disable_backlight;
1894                 panel->backlight.set = pch_set_backlight;
1895                 panel->backlight.get = pch_get_backlight;
1896                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1897         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1898                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1899                         panel->backlight.setup = pwm_setup_backlight;
1900                         panel->backlight.enable = pwm_enable_backlight;
1901                         panel->backlight.disable = pwm_disable_backlight;
1902                         panel->backlight.set = pwm_set_backlight;
1903                         panel->backlight.get = pwm_get_backlight;
1904                 } else {
1905                         panel->backlight.setup = vlv_setup_backlight;
1906                         panel->backlight.enable = vlv_enable_backlight;
1907                         panel->backlight.disable = vlv_disable_backlight;
1908                         panel->backlight.set = vlv_set_backlight;
1909                         panel->backlight.get = vlv_get_backlight;
1910                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1911                 }
1912         } else if (IS_GEN4(dev_priv)) {
1913                 panel->backlight.setup = i965_setup_backlight;
1914                 panel->backlight.enable = i965_enable_backlight;
1915                 panel->backlight.disable = i965_disable_backlight;
1916                 panel->backlight.set = i9xx_set_backlight;
1917                 panel->backlight.get = i9xx_get_backlight;
1918                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1919         } else {
1920                 panel->backlight.setup = i9xx_setup_backlight;
1921                 panel->backlight.enable = i9xx_enable_backlight;
1922                 panel->backlight.disable = i9xx_disable_backlight;
1923                 panel->backlight.set = i9xx_set_backlight;
1924                 panel->backlight.get = i9xx_get_backlight;
1925                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1926         }
1927 }
1928
1929 int intel_panel_init(struct intel_panel *panel,
1930                      struct drm_display_mode *fixed_mode,
1931                      struct drm_display_mode *downclock_mode)
1932 {
1933         intel_panel_init_backlight_funcs(panel);
1934
1935         panel->fixed_mode = fixed_mode;
1936         panel->downclock_mode = downclock_mode;
1937
1938         return 0;
1939 }
1940
1941 void intel_panel_fini(struct intel_panel *panel)
1942 {
1943         struct intel_connector *intel_connector =
1944                 container_of(panel, struct intel_connector, panel);
1945
1946         if (panel->fixed_mode)
1947                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1948
1949         if (panel->downclock_mode)
1950                 drm_mode_destroy(intel_connector->base.dev,
1951                                 panel->downclock_mode);
1952 }