sys/dev/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/moduleparam.h>
  33 #include <linux/pwm.h>
  34 #include "intel_drv.h"
  35
  36 #define CRC_PMIC_PWM_PERIOD_NS  21333
  37
  38 void
  39 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  40                        struct drm_display_mode *adjusted_mode)
  41 {
  42         drm_mode_copy(adjusted_mode, fixed_mode);
  43
  44         drm_mode_set_crtcinfo(adjusted_mode, 0);
  45 }
  46
  47 /**
  48  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  49  * @dev: drm device
  50  * @fixed_mode : panel native mode
  51  * @connector: LVDS/eDP connector
  52  *
  53  * Return downclock_avail
  54  * Find the reduced downclock for LVDS/eDP in EDID.
  55  */
  56 struct drm_display_mode *
  57 intel_find_panel_downclock(struct drm_device *dev,
  58                         struct drm_display_mode *fixed_mode,
  59                         struct drm_connector *connector)
  60 {
  61         struct drm_display_mode *scan, *tmp_mode;
  62         int temp_downclock;
  63
  64         temp_downclock = fixed_mode->clock;
  65         tmp_mode = NULL;
  66
  67         list_for_each_entry(scan, &connector->probed_modes, head) {
  68                 /*
  69                  * If one mode has the same resolution with the fixed_panel
  70                  * mode while they have the different refresh rate, it means
  71                  * that the reduced downclock is found. In such
  72                  * case we can set the different FPx0/1 to dynamically select
  73                  * between low and high frequency.
  74                  */
  75                 if (scan->hdisplay == fixed_mode->hdisplay &&
  76                     scan->hsync_start == fixed_mode->hsync_start &&
  77                     scan->hsync_end == fixed_mode->hsync_end &&
  78                     scan->htotal == fixed_mode->htotal &&
  79                     scan->vdisplay == fixed_mode->vdisplay &&
  80                     scan->vsync_start == fixed_mode->vsync_start &&
  81                     scan->vsync_end == fixed_mode->vsync_end &&
  82                     scan->vtotal == fixed_mode->vtotal) {
  83                         if (scan->clock < temp_downclock) {
  84                                 /*
  85                                  * The downclock is already found. But we
  86                                  * expect to find the lower downclock.
  87                                  */
  88                                 temp_downclock = scan->clock;
  89                                 tmp_mode = scan;
  90                         }
  91                 }
  92         }
  93
  94         if (temp_downclock < fixed_mode->clock)
  95                 return drm_mode_duplicate(dev, tmp_mode);
  96         else
  97                 return NULL;
  98 }
  99
 100 /* adjusted_mode has been preset to be the panel's fixed mode */
 101 void
 102 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 103                         struct intel_crtc_state *pipe_config,
 104                         int fitting_mode)
 105 {
 106         struct drm_display_mode *adjusted_mode;
 107         int x, y, width, height;
 108
 109         adjusted_mode = &pipe_config->base.adjusted_mode;
 110
 111         x = y = width = height = 0;
 112
 113         /* Native modes don't need fitting */
 114         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 115             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 116                 goto done;
 117
 118         switch (fitting_mode) {
 119         case DRM_MODE_SCALE_CENTER:
 120                 width = pipe_config->pipe_src_w;
 121                 height = pipe_config->pipe_src_h;
 122                 x = (adjusted_mode->hdisplay - width + 1)/2;
 123                 y = (adjusted_mode->vdisplay - height + 1)/2;
 124                 break;
 125
 126         case DRM_MODE_SCALE_ASPECT:
 127                 /* Scale but preserve the aspect ratio */
 128                 {
 129                         u32 scaled_width = adjusted_mode->hdisplay
 130                                 * pipe_config->pipe_src_h;
 131                         u32 scaled_height = pipe_config->pipe_src_w
 132                                 * adjusted_mode->vdisplay;
 133                         if (scaled_width > scaled_height) { /* pillar */
 134                                 width = scaled_height / pipe_config->pipe_src_h;
 135                                 if (width & 1)
 136                                         width++;
 137                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
 138                                 y = 0;
 139                                 height = adjusted_mode->vdisplay;
 140                         } else if (scaled_width < scaled_height) { /* letter */
 141                                 height = scaled_width / pipe_config->pipe_src_w;
 142                                 if (height & 1)
 143                                     height++;
 144                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
 145                                 x = 0;
 146                                 width = adjusted_mode->hdisplay;
 147                         } else {
 148                                 x = y = 0;
 149                                 width = adjusted_mode->hdisplay;
 150                                 height = adjusted_mode->vdisplay;
 151                         }
 152                 }
 153                 break;
 154
 155         case DRM_MODE_SCALE_FULLSCREEN:
 156                 x = y = 0;
 157                 width = adjusted_mode->hdisplay;
 158                 height = adjusted_mode->vdisplay;
 159                 break;
 160
 161         default:
 162                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 163                 return;
 164         }
 165
 166 done:
 167         pipe_config->pch_pfit.pos = (x << 16) | y;
 168         pipe_config->pch_pfit.size = (width << 16) | height;
 169         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 170 }
 171
 172 static void
 173 centre_horizontally(struct drm_display_mode *mode,
 174                     int width)
 175 {
 176         u32 border, sync_pos, blank_width, sync_width;
 177
 178         /* keep the hsync and hblank widths constant */
 179         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 180         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 181         sync_pos = (blank_width - sync_width + 1) / 2;
 182
 183         border = (mode->hdisplay - width + 1) / 2;
 184         border += border & 1; /* make the border even */
 185
 186         mode->crtc_hdisplay = width;
 187         mode->crtc_hblank_start = width + border;
 188         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 189
 190         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 191         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 192 }
 193
 194 static void
 195 centre_vertically(struct drm_display_mode *mode,
 196                   int height)
 197 {
 198         u32 border, sync_pos, blank_width, sync_width;
 199
 200         /* keep the vsync and vblank widths constant */
 201         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 202         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 203         sync_pos = (blank_width - sync_width + 1) / 2;
 204
 205         border = (mode->vdisplay - height + 1) / 2;
 206
 207         mode->crtc_vdisplay = height;
 208         mode->crtc_vblank_start = height + border;
 209         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 210
 211         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 212         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 213 }
 214
 215 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 216 {
 217         /*
 218          * Floating point operation is not supported. So the FACTOR
 219          * is defined, which can avoid the floating point computation
 220          * when calculating the panel ratio.
 221          */
 222 #define ACCURACY 12
 223 #define FACTOR (1 << ACCURACY)
 224         u32 ratio = source * FACTOR / target;
 225         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 226 }
 227
 228 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 229                               u32 *pfit_control)
 230 {
 231         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 232         u32 scaled_width = adjusted_mode->hdisplay *
 233                 pipe_config->pipe_src_h;
 234         u32 scaled_height = pipe_config->pipe_src_w *
 235                 adjusted_mode->vdisplay;
 236
 237         /* 965+ is easy, it does everything in hw */
 238         if (scaled_width > scaled_height)
 239                 *pfit_control |= PFIT_ENABLE |
 240                         PFIT_SCALING_PILLAR;
 241         else if (scaled_width < scaled_height)
 242                 *pfit_control |= PFIT_ENABLE |
 243                         PFIT_SCALING_LETTER;
 244         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 245                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 246 }
 247
 248 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 249                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 250                               u32 *border)
 251 {
 252         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 253         u32 scaled_width = adjusted_mode->hdisplay *
 254                 pipe_config->pipe_src_h;
 255         u32 scaled_height = pipe_config->pipe_src_w *
 256                 adjusted_mode->vdisplay;
 257         u32 bits;
 258
 259         /*
 260          * For earlier chips we have to calculate the scaling
 261          * ratio by hand and program it into the
 262          * PFIT_PGM_RATIO register
 263          */
 264         if (scaled_width > scaled_height) { /* pillar */
 265                 centre_horizontally(adjusted_mode,
 266                                     scaled_height /
 267                                     pipe_config->pipe_src_h);
 268
 269                 *border = LVDS_BORDER_ENABLE;
 270                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 271                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 272                                                     adjusted_mode->vdisplay);
 273
 274                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 275                                              bits << PFIT_VERT_SCALE_SHIFT);
 276                         *pfit_control |= (PFIT_ENABLE |
 277                                           VERT_INTERP_BILINEAR |
 278                                           HORIZ_INTERP_BILINEAR);
 279                 }
 280         } else if (scaled_width < scaled_height) { /* letter */
 281                 centre_vertically(adjusted_mode,
 282                                   scaled_width /
 283                                   pipe_config->pipe_src_w);
 284
 285                 *border = LVDS_BORDER_ENABLE;
 286                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 287                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 288                                                     adjusted_mode->hdisplay);
 289
 290                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 291                                              bits << PFIT_VERT_SCALE_SHIFT);
 292                         *pfit_control |= (PFIT_ENABLE |
 293                                           VERT_INTERP_BILINEAR |
 294                                           HORIZ_INTERP_BILINEAR);
 295                 }
 296         } else {
 297                 /* Aspects match, Let hw scale both directions */
 298                 *pfit_control |= (PFIT_ENABLE |
 299                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 300                                   VERT_INTERP_BILINEAR |
 301                                   HORIZ_INTERP_BILINEAR);
 302         }
 303 }
 304
 305 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 306                               struct intel_crtc_state *pipe_config,
 307                               int fitting_mode)
 308 {
 309         struct drm_device *dev = intel_crtc->base.dev;
 310         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 311         struct drm_display_mode *adjusted_mode;
 312
 313         adjusted_mode = &pipe_config->base.adjusted_mode;
 314
 315         /* Native modes don't need fitting */
 316         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 317             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 318                 goto out;
 319
 320         switch (fitting_mode) {
 321         case DRM_MODE_SCALE_CENTER:
 322                 /*
 323                  * For centered modes, we have to calculate border widths &
 324                  * heights and modify the values programmed into the CRTC.
 325                  */
 326                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 327                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 328                 border = LVDS_BORDER_ENABLE;
 329                 break;
 330         case DRM_MODE_SCALE_ASPECT:
 331                 /* Scale but preserve the aspect ratio */
 332                 if (INTEL_INFO(dev)->gen >= 4)
 333                         i965_scale_aspect(pipe_config, &pfit_control);
 334                 else
 335                         i9xx_scale_aspect(pipe_config, &pfit_control,
 336                                           &pfit_pgm_ratios, &border);
 337                 break;
 338         case DRM_MODE_SCALE_FULLSCREEN:
 339                 /*
 340                  * Full scaling, even if it changes the aspect ratio.
 341                  * Fortunately this is all done for us in hw.
 342                  */
 343                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 344                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 345                         pfit_control |= PFIT_ENABLE;
 346                         if (INTEL_INFO(dev)->gen >= 4)
 347                                 pfit_control |= PFIT_SCALING_AUTO;
 348                         else
 349                                 pfit_control |= (VERT_AUTO_SCALE |
 350                                                  VERT_INTERP_BILINEAR |
 351                                                  HORIZ_AUTO_SCALE |
 352                                                  HORIZ_INTERP_BILINEAR);
 353                 }
 354                 break;
 355         default:
 356                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 357                 return;
 358         }
 359
 360         /* 965+ wants fuzzy fitting */
 361         /* FIXME: handle multiple panels by failing gracefully */
 362         if (INTEL_INFO(dev)->gen >= 4)
 363                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 364                                  PFIT_FILTER_FUZZY);
 365
 366 out:
 367         if ((pfit_control & PFIT_ENABLE) == 0) {
 368                 pfit_control = 0;
 369                 pfit_pgm_ratios = 0;
 370         }
 371
 372         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 373         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 374                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 375
 376         pipe_config->gmch_pfit.control = pfit_control;
 377         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 378         pipe_config->gmch_pfit.lvds_border_bits = border;
 379 }
 380
 381 enum drm_connector_status
 382 intel_panel_detect(struct drm_device *dev)
 383 {
 384         struct drm_i915_private *dev_priv = dev->dev_private;
 385
 386         /* Assume that the BIOS does not lie through the OpRegion... */
 387         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 388                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 389                         connector_status_connected :
 390                         connector_status_disconnected;
 391         }
 392
 393         switch (i915.panel_ignore_lid) {
 394         case -2:
 395                 return connector_status_connected;
 396         case -1:
 397                 return connector_status_disconnected;
 398         default:
 399                 return connector_status_unknown;
 400         }
 401 }
 402
 403 /**
 404  * scale - scale values from one range to another
 405  *
 406  * @source_val: value in range [@source_min..@source_max]
 407  *
 408  * Return @source_val in range [@source_min..@source_max] scaled to range
 409  * [@target_min..@target_max].
 410  */
 411 static uint32_t scale(uint32_t source_val,
 412                       uint32_t source_min, uint32_t source_max,
 413                       uint32_t target_min, uint32_t target_max)
 414 {
 415         uint64_t target_val;
 416
 417         WARN_ON(source_min > source_max);
 418         WARN_ON(target_min > target_max);
 419
 420         /* defensive */
 421         source_val = clamp(source_val, source_min, source_max);
 422
 423         /* avoid overflows */
 424         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 425                         (target_max - target_min), source_max - source_min);
 426         target_val += target_min;
 427
 428         return target_val;
 429 }
 430
 431 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 432 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 433                                    u32 user_level, u32 user_max)
 434 {
 435         struct intel_panel *panel = &connector->panel;
 436
 437         return scale(user_level, 0, user_max,
 438                      panel->backlight.min, panel->backlight.max);
 439 }
 440
 441 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 442  * to [hw_min..hw_max]. */
 443 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 444                                    u32 user_level, u32 user_max)
 445 {
 446         struct intel_panel *panel = &connector->panel;
 447         u32 hw_level;
 448
 449         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 450         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 451
 452         return hw_level;
 453 }
 454
 455 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 456 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 457                                    u32 hw_level, u32 user_max)
 458 {
 459         struct intel_panel *panel = &connector->panel;
 460
 461         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 462                      0, user_max);
 463 }
 464
 465 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 466                                           u32 val)
 467 {
 468         struct drm_device *dev = connector->base.dev;
 469         struct drm_i915_private *dev_priv = dev->dev_private;
 470         struct intel_panel *panel = &connector->panel;
 471
 472         WARN_ON(panel->backlight.max == 0);
 473
 474         if (i915.invert_brightness < 0)
 475                 return val;
 476
 477         if (i915.invert_brightness > 0 ||
 478             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 479                 return panel->backlight.max - val;
 480         }
 481
 482         return val;
 483 }
 484
 485 static u32 bdw_get_backlight(struct intel_connector *connector)
 486 {
 487         struct drm_device *dev = connector->base.dev;
 488         struct drm_i915_private *dev_priv = dev->dev_private;
 489
 490         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 491 }
 492
 493 static u32 pch_get_backlight(struct intel_connector *connector)
 494 {
 495         struct drm_device *dev = connector->base.dev;
 496         struct drm_i915_private *dev_priv = dev->dev_private;
 497
 498         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 499 }
 500
 501 static u32 i9xx_get_backlight(struct intel_connector *connector)
 502 {
 503         struct drm_device *dev = connector->base.dev;
 504         struct drm_i915_private *dev_priv = dev->dev_private;
 505         struct intel_panel *panel = &connector->panel;
 506         u32 val;
 507
 508         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 509         if (INTEL_INFO(dev)->gen < 4)
 510                 val >>= 1;
 511
 512         if (panel->backlight.combination_mode) {
 513                 u8 lbpc;
 514
 515                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 516                 val *= lbpc;
 517         }
 518
 519         return val;
 520 }
 521
 522 static u32 _vlv_get_backlight(struct drm_device *dev, enum i915_pipe pipe)
 523 {
 524         struct drm_i915_private *dev_priv = dev->dev_private;
 525
 526         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 527                 return 0;
 528
 529         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 530 }
 531
 532 static u32 vlv_get_backlight(struct intel_connector *connector)
 533 {
 534         struct drm_device *dev = connector->base.dev;
 535         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 536
 537         return _vlv_get_backlight(dev, pipe);
 538 }
 539
 540 static u32 bxt_get_backlight(struct intel_connector *connector)
 541 {
 542         struct drm_device *dev = connector->base.dev;
 543         struct drm_i915_private *dev_priv = dev->dev_private;
 544
 545         return I915_READ(BXT_BLC_PWM_DUTY1);
 546 }
 547
 548 static u32 pwm_get_backlight(struct intel_connector *connector)
 549 {
 550         struct intel_panel *panel = &connector->panel;
 551         int duty_ns;
 552
 553         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 554         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 555 }
 556
 557 #if 0
 558 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 559 {
 560         struct drm_device *dev = connector->base.dev;
 561         struct drm_i915_private *dev_priv = dev->dev_private;
 562         struct intel_panel *panel = &connector->panel;
 563         u32 val = 0;
 564
 565         mutex_lock(&dev_priv->backlight_lock);
 566
 567         if (panel->backlight.enabled) {
 568                 val = dev_priv->display.get_backlight(connector);
 569                 val = intel_panel_compute_brightness(connector, val);
 570         }
 571
 572         mutex_unlock(&dev_priv->backlight_lock);
 573
 574         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 575         return val;
 576 }
 577 #endif
 578
 579 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 580 {
 581         struct drm_device *dev = connector->base.dev;
 582         struct drm_i915_private *dev_priv = dev->dev_private;
 583         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 584         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 585 }
 586
 587 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 588 {
 589         struct drm_device *dev = connector->base.dev;
 590         struct drm_i915_private *dev_priv = dev->dev_private;
 591         u32 tmp;
 592
 593         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 594         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 595 }
 596
 597 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 598 {
 599         struct drm_device *dev = connector->base.dev;
 600         struct drm_i915_private *dev_priv = dev->dev_private;
 601         struct intel_panel *panel = &connector->panel;
 602         u32 tmp, mask;
 603
 604         WARN_ON(panel->backlight.max == 0);
 605
 606         if (panel->backlight.combination_mode) {
 607                 u8 lbpc;
 608
 609                 lbpc = level * 0xfe / panel->backlight.max + 1;
 610                 level /= lbpc;
 611                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 612         }
 613
 614         if (IS_GEN4(dev)) {
 615                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 616         } else {
 617                 level <<= 1;
 618                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 619         }
 620
 621         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 622         I915_WRITE(BLC_PWM_CTL, tmp | level);
 623 }
 624
 625 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 626 {
 627         struct drm_device *dev = connector->base.dev;
 628         struct drm_i915_private *dev_priv = dev->dev_private;
 629         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 630         u32 tmp;
 631
 632         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 633                 return;
 634
 635         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 636         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 637 }
 638
 639 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
 640 {
 641         struct drm_device *dev = connector->base.dev;
 642         struct drm_i915_private *dev_priv = dev->dev_private;
 643
 644         I915_WRITE(BXT_BLC_PWM_DUTY1, level);
 645 }
 646
 647 static void pwm_set_backlight(struct intel_connector *connector, u32 level)
 648 {
 649         struct intel_panel *panel = &connector->panel;
 650         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 651
 652         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 653 }
 654
 655 static void
 656 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 657 {
 658         struct drm_device *dev = connector->base.dev;
 659         struct drm_i915_private *dev_priv = dev->dev_private;
 660
 661         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 662
 663         level = intel_panel_compute_brightness(connector, level);
 664         dev_priv->display.set_backlight(connector, level);
 665 }
 666
 667 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 668 static void intel_panel_set_backlight(struct intel_connector *connector,
 669                                       u32 user_level, u32 user_max)
 670 {
 671         struct drm_device *dev = connector->base.dev;
 672         struct drm_i915_private *dev_priv = dev->dev_private;
 673         struct intel_panel *panel = &connector->panel;
 674         u32 hw_level;
 675
 676         if (!panel->backlight.present)
 677                 return;
 678
 679         mutex_lock(&dev_priv->backlight_lock);
 680
 681         WARN_ON(panel->backlight.max == 0);
 682
 683         hw_level = scale_user_to_hw(connector, user_level, user_max);
 684         panel->backlight.level = hw_level;
 685
 686         if (panel->backlight.enabled)
 687                 intel_panel_actually_set_backlight(connector, hw_level);
 688
 689         mutex_unlock(&dev_priv->backlight_lock);
 690 }
 691
 692 /* set backlight brightness to level in range [0..max], assuming hw min is
 693  * respected.
 694  */
 695 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 696                                     u32 user_level, u32 user_max)
 697 {
 698         struct drm_device *dev = connector->base.dev;
 699         struct drm_i915_private *dev_priv = dev->dev_private;
 700         struct intel_panel *panel = &connector->panel;
 701         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 702         u32 hw_level;
 703
 704         /*
 705          * INVALID_PIPE may occur during driver init because
 706          * connection_mutex isn't held across the entire backlight
 707          * setup + modeset readout, and the BIOS can issue the
 708          * requests at any time.
 709          */
 710         if (!panel->backlight.present || pipe == INVALID_PIPE)
 711                 return;
 712
 713         mutex_lock(&dev_priv->backlight_lock);
 714
 715         WARN_ON(panel->backlight.max == 0);
 716
 717         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 718         panel->backlight.level = hw_level;
 719
 720         if (panel->backlight.device)
 721                 panel->backlight.device->props.brightness =
 722                         scale_hw_to_user(connector,
 723                                          panel->backlight.level,
 724                                          panel->backlight.device->props.max_brightness);
 725
 726         if (panel->backlight.enabled)
 727                 intel_panel_actually_set_backlight(connector, hw_level);
 728
 729         mutex_unlock(&dev_priv->backlight_lock);
 730 }
 731
 732 static void pch_disable_backlight(struct intel_connector *connector)
 733 {
 734         struct drm_device *dev = connector->base.dev;
 735         struct drm_i915_private *dev_priv = dev->dev_private;
 736         u32 tmp;
 737
 738         intel_panel_actually_set_backlight(connector, 0);
 739
 740         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 741         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 742
 743         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 744         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 745 }
 746
 747 static void i9xx_disable_backlight(struct intel_connector *connector)
 748 {
 749         intel_panel_actually_set_backlight(connector, 0);
 750 }
 751
 752 static void i965_disable_backlight(struct intel_connector *connector)
 753 {
 754         struct drm_device *dev = connector->base.dev;
 755         struct drm_i915_private *dev_priv = dev->dev_private;
 756         u32 tmp;
 757
 758         intel_panel_actually_set_backlight(connector, 0);
 759
 760         tmp = I915_READ(BLC_PWM_CTL2);
 761         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 762 }
 763
 764 static void vlv_disable_backlight(struct intel_connector *connector)
 765 {
 766         struct drm_device *dev = connector->base.dev;
 767         struct drm_i915_private *dev_priv = dev->dev_private;
 768         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 769         u32 tmp;
 770
 771         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 772                 return;
 773
 774         intel_panel_actually_set_backlight(connector, 0);
 775
 776         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 777         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 778 }
 779
 780 static void bxt_disable_backlight(struct intel_connector *connector)
 781 {
 782         struct drm_device *dev = connector->base.dev;
 783         struct drm_i915_private *dev_priv = dev->dev_private;
 784         u32 tmp;
 785
 786         intel_panel_actually_set_backlight(connector, 0);
 787
 788         tmp = I915_READ(BXT_BLC_PWM_CTL1);
 789         I915_WRITE(BXT_BLC_PWM_CTL1, tmp & ~BXT_BLC_PWM_ENABLE);
 790 }
 791
 792 static void pwm_disable_backlight(struct intel_connector *connector)
 793 {
 794         struct intel_panel *panel = &connector->panel;
 795
 796         /* Disable the backlight */
 797         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 798         usleep_range(2000, 3000);
 799         pwm_disable(panel->backlight.pwm);
 800 }
 801
 802 void intel_panel_disable_backlight(struct intel_connector *connector)
 803 {
 804         struct drm_device *dev = connector->base.dev;
 805         struct drm_i915_private *dev_priv = dev->dev_private;
 806         struct intel_panel *panel = &connector->panel;
 807
 808         if (!panel->backlight.present)
 809                 return;
 810
 811         /*
 812          * Do not disable backlight on the vgaswitcheroo path. When switching
 813          * away from i915, the other client may depend on i915 to handle the
 814          * backlight. This will leave the backlight on unnecessarily when
 815          * another client is not activated.
 816          */
 817         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 818                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 819                 return;
 820         }
 821
 822         mutex_lock(&dev_priv->backlight_lock);
 823
 824         if (panel->backlight.device)
 825                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 826         panel->backlight.enabled = false;
 827         dev_priv->display.disable_backlight(connector);
 828
 829         mutex_unlock(&dev_priv->backlight_lock);
 830 }
 831
 832 static void bdw_enable_backlight(struct intel_connector *connector)
 833 {
 834         struct drm_device *dev = connector->base.dev;
 835         struct drm_i915_private *dev_priv = dev->dev_private;
 836         struct intel_panel *panel = &connector->panel;
 837         u32 pch_ctl1, pch_ctl2;
 838
 839         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 840         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 841                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 842                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 843                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 844         }
 845
 846         pch_ctl2 = panel->backlight.max << 16;
 847         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 848
 849         pch_ctl1 = 0;
 850         if (panel->backlight.active_low_pwm)
 851                 pch_ctl1 |= BLM_PCH_POLARITY;
 852
 853         /* After LPT, override is the default. */
 854         if (HAS_PCH_LPT(dev_priv))
 855                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 856
 857         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 858         POSTING_READ(BLC_PWM_PCH_CTL1);
 859         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 860
 861         /* This won't stick until the above enable. */
 862         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 863 }
 864
 865 static void pch_enable_backlight(struct intel_connector *connector)
 866 {
 867         struct drm_device *dev = connector->base.dev;
 868         struct drm_i915_private *dev_priv = dev->dev_private;
 869         struct intel_panel *panel = &connector->panel;
 870         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 871         enum transcoder cpu_transcoder =
 872                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 873         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 874
 875         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 876         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 877                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 878                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 879                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 880         }
 881
 882         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 883         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 884                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 885                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 886                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 887         }
 888
 889         if (cpu_transcoder == TRANSCODER_EDP)
 890                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 891         else
 892                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 893         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 894         POSTING_READ(BLC_PWM_CPU_CTL2);
 895         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 896
 897         /* This won't stick until the above enable. */
 898         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 899
 900         pch_ctl2 = panel->backlight.max << 16;
 901         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 902
 903         pch_ctl1 = 0;
 904         if (panel->backlight.active_low_pwm)
 905                 pch_ctl1 |= BLM_PCH_POLARITY;
 906
 907         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 908         POSTING_READ(BLC_PWM_PCH_CTL1);
 909         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 910 }
 911
 912 static void i9xx_enable_backlight(struct intel_connector *connector)
 913 {
 914         struct drm_device *dev = connector->base.dev;
 915         struct drm_i915_private *dev_priv = dev->dev_private;
 916         struct intel_panel *panel = &connector->panel;
 917         u32 ctl, freq;
 918
 919         ctl = I915_READ(BLC_PWM_CTL);
 920         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 921                 DRM_DEBUG_KMS("backlight already enabled\n");
 922                 I915_WRITE(BLC_PWM_CTL, 0);
 923         }
 924
 925         freq = panel->backlight.max;
 926         if (panel->backlight.combination_mode)
 927                 freq /= 0xff;
 928
 929         ctl = freq << 17;
 930         if (panel->backlight.combination_mode)
 931                 ctl |= BLM_LEGACY_MODE;
 932         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 933                 ctl |= BLM_POLARITY_PNV;
 934
 935         I915_WRITE(BLC_PWM_CTL, ctl);
 936         POSTING_READ(BLC_PWM_CTL);
 937
 938         /* XXX: combine this into above write? */
 939         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 940
 941         /*
 942          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 943          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 944          * that has backlight.
 945          */
 946         if (IS_GEN2(dev))
 947                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 948 }
 949
 950 static void i965_enable_backlight(struct intel_connector *connector)
 951 {
 952         struct drm_device *dev = connector->base.dev;
 953         struct drm_i915_private *dev_priv = dev->dev_private;
 954         struct intel_panel *panel = &connector->panel;
 955         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 956         u32 ctl, ctl2, freq;
 957
 958         ctl2 = I915_READ(BLC_PWM_CTL2);
 959         if (ctl2 & BLM_PWM_ENABLE) {
 960                 DRM_DEBUG_KMS("backlight already enabled\n");
 961                 ctl2 &= ~BLM_PWM_ENABLE;
 962                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 963         }
 964
 965         freq = panel->backlight.max;
 966         if (panel->backlight.combination_mode)
 967                 freq /= 0xff;
 968
 969         ctl = freq << 16;
 970         I915_WRITE(BLC_PWM_CTL, ctl);
 971
 972         ctl2 = BLM_PIPE(pipe);
 973         if (panel->backlight.combination_mode)
 974                 ctl2 |= BLM_COMBINATION_MODE;
 975         if (panel->backlight.active_low_pwm)
 976                 ctl2 |= BLM_POLARITY_I965;
 977         I915_WRITE(BLC_PWM_CTL2, ctl2);
 978         POSTING_READ(BLC_PWM_CTL2);
 979         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 980
 981         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 982 }
 983
 984 static void vlv_enable_backlight(struct intel_connector *connector)
 985 {
 986         struct drm_device *dev = connector->base.dev;
 987         struct drm_i915_private *dev_priv = dev->dev_private;
 988         struct intel_panel *panel = &connector->panel;
 989         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 990         u32 ctl, ctl2;
 991
 992         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 993                 return;
 994
 995         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 996         if (ctl2 & BLM_PWM_ENABLE) {
 997                 DRM_DEBUG_KMS("backlight already enabled\n");
 998                 ctl2 &= ~BLM_PWM_ENABLE;
 999                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1000         }
1001
1002         ctl = panel->backlight.max << 16;
1003         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1004
1005         /* XXX: combine this into above write? */
1006         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1007
1008         ctl2 = 0;
1009         if (panel->backlight.active_low_pwm)
1010                 ctl2 |= BLM_POLARITY_I965;
1011         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1012         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1013         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1014 }
1015
1016 static void bxt_enable_backlight(struct intel_connector *connector)
1017 {
1018         struct drm_device *dev = connector->base.dev;
1019         struct drm_i915_private *dev_priv = dev->dev_private;
1020         struct intel_panel *panel = &connector->panel;
1021         u32 pwm_ctl;
1022
1023         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1024         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1025                 DRM_DEBUG_KMS("backlight already enabled\n");
1026                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1027                 I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1028         }
1029
1030         I915_WRITE(BXT_BLC_PWM_FREQ1, panel->backlight.max);
1031
1032         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1033
1034         pwm_ctl = 0;
1035         if (panel->backlight.active_low_pwm)
1036                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1037
1038         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1039         POSTING_READ(BXT_BLC_PWM_CTL1);
1040         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl | BXT_BLC_PWM_ENABLE);
1041 }
1042
1043 static void pwm_enable_backlight(struct intel_connector *connector)
1044 {
1045         struct intel_panel *panel = &connector->panel;
1046
1047         pwm_enable(panel->backlight.pwm);
1048         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1049 }
1050
1051 void intel_panel_enable_backlight(struct intel_connector *connector)
1052 {
1053         struct drm_device *dev = connector->base.dev;
1054         struct drm_i915_private *dev_priv = dev->dev_private;
1055         struct intel_panel *panel = &connector->panel;
1056         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
1057
1058         if (!panel->backlight.present)
1059                 return;
1060
1061         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1062
1063         mutex_lock(&dev_priv->backlight_lock);
1064
1065         WARN_ON(panel->backlight.max == 0);
1066
1067         if (panel->backlight.level <= panel->backlight.min) {
1068                 panel->backlight.level = panel->backlight.max;
1069                 if (panel->backlight.device)
1070                         panel->backlight.device->props.brightness =
1071                                 scale_hw_to_user(connector,
1072                                                  panel->backlight.level,
1073                                                  panel->backlight.device->props.max_brightness);
1074         }
1075
1076         dev_priv->display.enable_backlight(connector);
1077         panel->backlight.enabled = true;
1078         if (panel->backlight.device)
1079                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1080
1081         mutex_unlock(&dev_priv->backlight_lock);
1082 }
1083
1084 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1085 static int intel_backlight_device_update_status(struct backlight_device *bd)
1086 {
1087 #if 0
1088         struct intel_connector *connector = bl_get_data(bd);
1089         struct intel_panel *panel = &connector->panel;
1090         struct drm_device *dev = connector->base.dev;
1091
1092         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1093         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1094                       bd->props.brightness, bd->props.max_brightness);
1095         intel_panel_set_backlight(connector, bd->props.brightness,
1096                                   bd->props.max_brightness);
1097
1098         /*
1099          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1100          * backlight class device does not make it easy to to differentiate
1101          * between callbacks for brightness and bl_power, so our backlight_power
1102          * callback needs to take this into account.
1103          */
1104         if (panel->backlight.enabled) {
1105                 if (panel->backlight_power) {
1106                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1107                                 bd->props.brightness != 0;
1108                         panel->backlight_power(connector, enable);
1109                 }
1110         } else {
1111                 bd->props.power = FB_BLANK_POWERDOWN;
1112         }
1113
1114         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1115 #endif
1116         return 0;
1117 }
1118
1119 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1120 {
1121 #if 0
1122         struct intel_connector *connector = bl_get_data(bd);
1123         struct drm_device *dev = connector->base.dev;
1124         struct drm_i915_private *dev_priv = dev->dev_private;
1125         u32 hw_level;
1126         int ret;
1127
1128         intel_runtime_pm_get(dev_priv);
1129         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1130
1131         hw_level = intel_panel_get_backlight(connector);
1132         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1133
1134         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1135         intel_runtime_pm_put(dev_priv);
1136
1137         return ret;
1138 #endif
1139         return 0;
1140 }
1141
1142 static const struct backlight_ops intel_backlight_device_ops = {
1143         .update_status = intel_backlight_device_update_status,
1144         .get_brightness = intel_backlight_device_get_brightness,
1145 };
1146
1147 static int intel_backlight_device_register(struct intel_connector *connector)
1148 {
1149         struct intel_panel *panel = &connector->panel;
1150         struct backlight_properties props;
1151
1152         if (WARN_ON(panel->backlight.device))
1153                 return -ENODEV;
1154
1155         if (!panel->backlight.present)
1156                 return 0;
1157
1158         WARN_ON(panel->backlight.max == 0);
1159
1160         memset(&props, 0, sizeof(props));
1161         props.type = BACKLIGHT_RAW;
1162
1163         /*
1164          * Note: Everything should work even if the backlight device max
1165          * presented to the userspace is arbitrarily chosen.
1166          */
1167         props.max_brightness = panel->backlight.max;
1168         props.brightness = scale_hw_to_user(connector,
1169                                             panel->backlight.level,
1170                                             props.max_brightness);
1171
1172         if (panel->backlight.enabled)
1173                 props.power = FB_BLANK_UNBLANK;
1174         else
1175                 props.power = FB_BLANK_POWERDOWN;
1176
1177         /*
1178          * Note: using the same name independent of the connector prevents
1179          * registration of multiple backlight devices in the driver.
1180          */
1181 #if 0
1182         panel->backlight.device =
1183                 backlight_device_register("intel_backlight",
1184                                           connector->base.kdev,
1185                                           connector,
1186                                           &intel_backlight_device_ops, &props);
1187
1188         if (IS_ERR(panel->backlight.device)) {
1189                 DRM_ERROR("Failed to register backlight: %ld\n",
1190                           PTR_ERR(panel->backlight.device));
1191                 panel->backlight.device = NULL;
1192                 return -ENODEV;
1193         }
1194 #endif
1195
1196         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1197                       connector->base.name);
1198
1199         return 0;
1200 }
1201
1202 static void intel_backlight_device_unregister(struct intel_connector *connector)
1203 {
1204 #if 0
1205         struct intel_panel *panel = &connector->panel;
1206
1207         if (panel->backlight.device) {
1208                 backlight_device_unregister(panel->backlight.device);
1209                 panel->backlight.device = NULL;
1210         }
1211 #endif
1212 }
1213 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1214 static int intel_backlight_device_register(struct intel_connector *connector)
1215 {
1216         return 0;
1217 }
1218 static void intel_backlight_device_unregister(struct intel_connector *connector)
1219 {
1220 }
1221 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1222
1223 /*
1224  * Note: The setup hooks can't assume pipe is set!
1225  *
1226  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1227  * appropriately when it's 0. Use VBT and/or sane defaults.
1228  */
1229 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1230 {
1231         struct drm_device *dev = connector->base.dev;
1232         struct drm_i915_private *dev_priv = dev->dev_private;
1233         struct intel_panel *panel = &connector->panel;
1234         int min;
1235
1236         WARN_ON(panel->backlight.max == 0);
1237
1238         /*
1239          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1240          * to problems. There are such machines out there. Either our
1241          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1242          * against this by letting the minimum be at most (arbitrarily chosen)
1243          * 25% of the max.
1244          */
1245         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1246         if (min != dev_priv->vbt.backlight.min_brightness) {
1247                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1248                               dev_priv->vbt.backlight.min_brightness, min);
1249         }
1250
1251         /* vbt value is a coefficient in range [0..255] */
1252         return scale(min, 0, 255, 0, panel->backlight.max);
1253 }
1254
1255 static int bdw_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1256 {
1257         struct drm_device *dev = connector->base.dev;
1258         struct drm_i915_private *dev_priv = dev->dev_private;
1259         struct intel_panel *panel = &connector->panel;
1260         u32 pch_ctl1, pch_ctl2, val;
1261
1262         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1263         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1264
1265         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1266         panel->backlight.max = pch_ctl2 >> 16;
1267         if (!panel->backlight.max)
1268                 return -ENODEV;
1269
1270         panel->backlight.min = get_backlight_min_vbt(connector);
1271
1272         val = bdw_get_backlight(connector);
1273         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1274
1275         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1276                 panel->backlight.level != 0;
1277
1278         return 0;
1279 }
1280
1281 static int pch_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1282 {
1283         struct drm_device *dev = connector->base.dev;
1284         struct drm_i915_private *dev_priv = dev->dev_private;
1285         struct intel_panel *panel = &connector->panel;
1286         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1287
1288         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1289         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1290
1291         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1292         panel->backlight.max = pch_ctl2 >> 16;
1293         if (!panel->backlight.max)
1294                 return -ENODEV;
1295
1296         panel->backlight.min = get_backlight_min_vbt(connector);
1297
1298         val = pch_get_backlight(connector);
1299         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1300
1301         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1302         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1303                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1304
1305         return 0;
1306 }
1307
1308 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1309 {
1310         struct drm_device *dev = connector->base.dev;
1311         struct drm_i915_private *dev_priv = dev->dev_private;
1312         struct intel_panel *panel = &connector->panel;
1313         u32 ctl, val;
1314
1315         ctl = I915_READ(BLC_PWM_CTL);
1316
1317         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1318                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1319
1320         if (IS_PINEVIEW(dev))
1321                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1322
1323         panel->backlight.max = ctl >> 17;
1324         if (panel->backlight.combination_mode)
1325                 panel->backlight.max *= 0xff;
1326
1327         if (!panel->backlight.max)
1328                 return -ENODEV;
1329
1330         panel->backlight.min = get_backlight_min_vbt(connector);
1331
1332         val = i9xx_get_backlight(connector);
1333         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1334
1335         panel->backlight.enabled = panel->backlight.level != 0;
1336
1337         return 0;
1338 }
1339
1340 static int i965_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1341 {
1342         struct drm_device *dev = connector->base.dev;
1343         struct drm_i915_private *dev_priv = dev->dev_private;
1344         struct intel_panel *panel = &connector->panel;
1345         u32 ctl, ctl2, val;
1346
1347         ctl2 = I915_READ(BLC_PWM_CTL2);
1348         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1349         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1350
1351         ctl = I915_READ(BLC_PWM_CTL);
1352         panel->backlight.max = ctl >> 16;
1353         if (panel->backlight.combination_mode)
1354                 panel->backlight.max *= 0xff;
1355
1356         if (!panel->backlight.max)
1357                 return -ENODEV;
1358
1359         panel->backlight.min = get_backlight_min_vbt(connector);
1360
1361         val = i9xx_get_backlight(connector);
1362         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1363
1364         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1365                 panel->backlight.level != 0;
1366
1367         return 0;
1368 }
1369
1370 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_pipe pipe)
1371 {
1372         struct drm_device *dev = connector->base.dev;
1373         struct drm_i915_private *dev_priv = dev->dev_private;
1374         struct intel_panel *panel = &connector->panel;
1375         enum i915_pipe p;
1376         u32 ctl, ctl2, val;
1377
1378         for_each_pipe(dev_priv, p) {
1379                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1380
1381                 /* Skip if the modulation freq is already set */
1382                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1383                         continue;
1384
1385                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1386                 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1387                            cur_val);
1388         }
1389
1390         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1391                 return -ENODEV;
1392
1393         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1394         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1395
1396         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1397         panel->backlight.max = ctl >> 16;
1398         if (!panel->backlight.max)
1399                 return -ENODEV;
1400
1401         panel->backlight.min = get_backlight_min_vbt(connector);
1402
1403         val = _vlv_get_backlight(dev, pipe);
1404         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1405
1406         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1407                 panel->backlight.level != 0;
1408
1409         return 0;
1410 }
1411
1412 #ifdef __DragonFly__
1413 /*
1414  * Read max backlight level
1415  */
1416 static int
1417 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1418 {
1419         int err, val;
1420         struct intel_connector *connector = arg1;
1421         struct drm_device *dev = connector->base.dev;
1422         struct drm_i915_private *dev_priv = dev->dev_private;
1423         struct intel_panel *panel = &connector->panel;
1424
1425         mutex_lock(&dev_priv->backlight_lock);
1426         val = panel->backlight.max;
1427         mutex_unlock(&dev_priv->backlight_lock);
1428
1429         err = sysctl_handle_int(oidp, &val, 0, req);
1430         return(err);
1431 }
1432
1433 /*
1434  * Read/write backlight level
1435  */
1436 static int
1437 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1438 {
1439         struct intel_connector *connector = arg1;
1440         struct drm_device *dev = connector->base.dev;
1441         struct drm_i915_private *dev_priv = dev->dev_private;
1442         struct intel_panel *panel = &connector->panel;
1443         int err, val;
1444         u32 user_level, max_brightness;
1445
1446         mutex_lock(&dev_priv->backlight_lock);
1447         max_brightness = panel->backlight.max;
1448         user_level = scale_hw_to_user(connector, panel->backlight.level,
1449             max_brightness);
1450         mutex_unlock(&dev_priv->backlight_lock);
1451
1452         val = user_level;
1453         err = sysctl_handle_int(oidp, &val, 0, req);
1454         if (err != 0 || req->newptr == NULL) {
1455                 return(err);
1456         }
1457
1458         if (val != user_level && val >= 0 && val <= max_brightness) {
1459                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1460                 intel_panel_set_backlight(arg1, val, max_brightness);
1461                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1462         }
1463
1464         return(err);
1465 }
1466 #endif /* __DragonFly__ */
1467
1468 static int
1469 bxt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1470 {
1471         struct drm_device *dev = connector->base.dev;
1472         struct drm_i915_private *dev_priv = dev->dev_private;
1473         struct intel_panel *panel = &connector->panel;
1474         u32 pwm_ctl, val;
1475
1476         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1477         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1478
1479         panel->backlight.max = I915_READ(BXT_BLC_PWM_FREQ1);
1480         if (!panel->backlight.max)
1481                 return -ENODEV;
1482
1483         val = bxt_get_backlight(connector);
1484         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1485
1486         panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1487                 panel->backlight.level != 0;
1488
1489         return 0;
1490 }
1491
1492 static int pwm_setup_backlight(struct intel_connector *connector,
1493                                enum i915_pipe pipe)
1494 {
1495         struct drm_device *dev = connector->base.dev;
1496         struct intel_panel *panel = &connector->panel;
1497         int retval;
1498
1499         /* Get the PWM chip for backlight control */
1500         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1501         if (IS_ERR(panel->backlight.pwm)) {
1502                 DRM_ERROR("Failed to own the pwm chip\n");
1503                 panel->backlight.pwm = NULL;
1504                 return -ENODEV;
1505         }
1506
1507         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1508                             CRC_PMIC_PWM_PERIOD_NS);
1509         if (retval < 0) {
1510                 DRM_ERROR("Failed to configure the pwm chip\n");
1511                 pwm_put(panel->backlight.pwm);
1512                 panel->backlight.pwm = NULL;
1513                 return retval;
1514         }
1515
1516         panel->backlight.min = 0; /* 0% */
1517         panel->backlight.max = 100; /* 100% */
1518         panel->backlight.level = DIV_ROUND_UP(
1519                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1520                                  CRC_PMIC_PWM_PERIOD_NS);
1521         panel->backlight.enabled = panel->backlight.level != 0;
1522
1523         return 0;
1524 }
1525
1526 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe)
1527 {
1528         struct drm_device *dev = connector->dev;
1529         struct drm_i915_private *dev_priv = dev->dev_private;
1530         struct intel_connector *intel_connector = to_intel_connector(connector);
1531         struct intel_panel *panel = &intel_connector->panel;
1532         int ret;
1533
1534         if (!dev_priv->vbt.backlight.present) {
1535                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1536                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1537                 } else {
1538                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1539                         return 0;
1540                 }
1541         }
1542
1543         /* set level and max in panel struct */
1544         mutex_lock(&dev_priv->backlight_lock);
1545         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1546         mutex_unlock(&dev_priv->backlight_lock);
1547
1548         if (ret) {
1549                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1550                               connector->name);
1551                 return ret;
1552         }
1553
1554         panel->backlight.present = true;
1555
1556 #ifdef __DragonFly__
1557         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1558                         OID_AUTO, "backlight_max",
1559                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1560                         connector, sizeof(int),
1561                         sysctl_backlight_max,
1562                         "I", "Max backlight level");
1563         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1564                         OID_AUTO, "backlight_level",
1565                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1566                         connector, sizeof(int),
1567                         sysctl_backlight_handler,
1568                         "I", "Backlight level");
1569 #endif
1570
1571         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1572                       connector->name,
1573                       panel->backlight.enabled ? "enabled" : "disabled",
1574                       panel->backlight.level, panel->backlight.max);
1575
1576         return 0;
1577 }
1578
1579 void intel_panel_destroy_backlight(struct drm_connector *connector)
1580 {
1581         struct intel_connector *intel_connector = to_intel_connector(connector);
1582         struct intel_panel *panel = &intel_connector->panel;
1583
1584         /* dispose of the pwm */
1585         if (panel->backlight.pwm)
1586                 pwm_put(panel->backlight.pwm);
1587
1588         panel->backlight.present = false;
1589 }
1590
1591 /* Set up chip specific backlight functions */
1592 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1593 {
1594         struct drm_i915_private *dev_priv = dev->dev_private;
1595
1596         if (IS_BROXTON(dev)) {
1597                 dev_priv->display.setup_backlight = bxt_setup_backlight;
1598                 dev_priv->display.enable_backlight = bxt_enable_backlight;
1599                 dev_priv->display.disable_backlight = bxt_disable_backlight;
1600                 dev_priv->display.set_backlight = bxt_set_backlight;
1601                 dev_priv->display.get_backlight = bxt_get_backlight;
1602         } else if (IS_BROADWELL(dev) || IS_SKYLAKE(dev)) {
1603                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1604                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1605                 dev_priv->display.disable_backlight = pch_disable_backlight;
1606                 dev_priv->display.set_backlight = bdw_set_backlight;
1607                 dev_priv->display.get_backlight = bdw_get_backlight;
1608         } else if (HAS_PCH_SPLIT(dev)) {
1609                 dev_priv->display.setup_backlight = pch_setup_backlight;
1610                 dev_priv->display.enable_backlight = pch_enable_backlight;
1611                 dev_priv->display.disable_backlight = pch_disable_backlight;
1612                 dev_priv->display.set_backlight = pch_set_backlight;
1613                 dev_priv->display.get_backlight = pch_get_backlight;
1614         } else if (IS_VALLEYVIEW(dev)) {
1615                 if (dev_priv->vbt.has_mipi) {
1616                         dev_priv->display.setup_backlight = pwm_setup_backlight;
1617                         dev_priv->display.enable_backlight = pwm_enable_backlight;
1618                         dev_priv->display.disable_backlight = pwm_disable_backlight;
1619                         dev_priv->display.set_backlight = pwm_set_backlight;
1620                         dev_priv->display.get_backlight = pwm_get_backlight;
1621                 } else {
1622                         dev_priv->display.setup_backlight = vlv_setup_backlight;
1623                         dev_priv->display.enable_backlight = vlv_enable_backlight;
1624                         dev_priv->display.disable_backlight = vlv_disable_backlight;
1625                         dev_priv->display.set_backlight = vlv_set_backlight;
1626                         dev_priv->display.get_backlight = vlv_get_backlight;
1627                 }
1628         } else if (IS_GEN4(dev)) {
1629                 dev_priv->display.setup_backlight = i965_setup_backlight;
1630                 dev_priv->display.enable_backlight = i965_enable_backlight;
1631                 dev_priv->display.disable_backlight = i965_disable_backlight;
1632                 dev_priv->display.set_backlight = i9xx_set_backlight;
1633                 dev_priv->display.get_backlight = i9xx_get_backlight;
1634         } else {
1635                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1636                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1637                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1638                 dev_priv->display.set_backlight = i9xx_set_backlight;
1639                 dev_priv->display.get_backlight = i9xx_get_backlight;
1640         }
1641 }
1642
1643 int intel_panel_init(struct intel_panel *panel,
1644                      struct drm_display_mode *fixed_mode,
1645                      struct drm_display_mode *downclock_mode)
1646 {
1647         panel->fixed_mode = fixed_mode;
1648         panel->downclock_mode = downclock_mode;
1649
1650         return 0;
1651 }
1652
1653 void intel_panel_fini(struct intel_panel *panel)
1654 {
1655         struct intel_connector *intel_connector =
1656                 container_of(panel, struct intel_connector, panel);
1657
1658         if (panel->fixed_mode)
1659                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1660
1661         if (panel->downclock_mode)
1662                 drm_mode_destroy(intel_connector->base.dev,
1663                                 panel->downclock_mode);
1664 }
1665
1666 void intel_backlight_register(struct drm_device *dev)
1667 {
1668         struct intel_connector *connector;
1669
1670         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1671                 intel_backlight_device_register(connector);
1672 }
1673
1674 void intel_backlight_unregister(struct drm_device *dev)
1675 {
1676         struct intel_connector *connector;
1677
1678         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1679                 intel_backlight_device_unregister(connector);
1680 }