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 "intel_drv.h"
  34
  35 void
  36 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  37                        struct drm_display_mode *adjusted_mode)
  38 {
  39         drm_mode_copy(adjusted_mode, fixed_mode);
  40
  41         drm_mode_set_crtcinfo(adjusted_mode, 0);
  42 }
  43
  44 /**
  45  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  46  * @dev: drm device
  47  * @fixed_mode : panel native mode
  48  * @connector: LVDS/eDP connector
  49  *
  50  * Return downclock_avail
  51  * Find the reduced downclock for LVDS/eDP in EDID.
  52  */
  53 struct drm_display_mode *
  54 intel_find_panel_downclock(struct drm_device *dev,
  55                         struct drm_display_mode *fixed_mode,
  56                         struct drm_connector *connector)
  57 {
  58         struct drm_display_mode *scan, *tmp_mode;
  59         int temp_downclock;
  60
  61         temp_downclock = fixed_mode->clock;
  62         tmp_mode = NULL;
  63
  64         list_for_each_entry(scan, &connector->probed_modes, head) {
  65                 /*
  66                  * If one mode has the same resolution with the fixed_panel
  67                  * mode while they have the different refresh rate, it means
  68                  * that the reduced downclock is found. In such
  69                  * case we can set the different FPx0/1 to dynamically select
  70                  * between low and high frequency.
  71                  */
  72                 if (scan->hdisplay == fixed_mode->hdisplay &&
  73                     scan->hsync_start == fixed_mode->hsync_start &&
  74                     scan->hsync_end == fixed_mode->hsync_end &&
  75                     scan->htotal == fixed_mode->htotal &&
  76                     scan->vdisplay == fixed_mode->vdisplay &&
  77                     scan->vsync_start == fixed_mode->vsync_start &&
  78                     scan->vsync_end == fixed_mode->vsync_end &&
  79                     scan->vtotal == fixed_mode->vtotal) {
  80                         if (scan->clock < temp_downclock) {
  81                                 /*
  82                                  * The downclock is already found. But we
  83                                  * expect to find the lower downclock.
  84                                  */
  85                                 temp_downclock = scan->clock;
  86                                 tmp_mode = scan;
  87                         }
  88                 }
  89         }
  90
  91         if (temp_downclock < fixed_mode->clock)
  92                 return drm_mode_duplicate(dev, tmp_mode);
  93         else
  94                 return NULL;
  95 }
  96
  97 /* adjusted_mode has been preset to be the panel's fixed mode */
  98 void
  99 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 100                         struct intel_crtc_state *pipe_config,
 101                         int fitting_mode)
 102 {
 103         struct drm_display_mode *adjusted_mode;
 104         int x, y, width, height;
 105
 106         adjusted_mode = &pipe_config->base.adjusted_mode;
 107
 108         x = y = width = height = 0;
 109
 110         /* Native modes don't need fitting */
 111         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 112             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 113                 goto done;
 114
 115         switch (fitting_mode) {
 116         case DRM_MODE_SCALE_CENTER:
 117                 width = pipe_config->pipe_src_w;
 118                 height = pipe_config->pipe_src_h;
 119                 x = (adjusted_mode->hdisplay - width + 1)/2;
 120                 y = (adjusted_mode->vdisplay - height + 1)/2;
 121                 break;
 122
 123         case DRM_MODE_SCALE_ASPECT:
 124                 /* Scale but preserve the aspect ratio */
 125                 {
 126                         u32 scaled_width = adjusted_mode->hdisplay
 127                                 * pipe_config->pipe_src_h;
 128                         u32 scaled_height = pipe_config->pipe_src_w
 129                                 * adjusted_mode->vdisplay;
 130                         if (scaled_width > scaled_height) { /* pillar */
 131                                 width = scaled_height / pipe_config->pipe_src_h;
 132                                 if (width & 1)
 133                                         width++;
 134                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
 135                                 y = 0;
 136                                 height = adjusted_mode->vdisplay;
 137                         } else if (scaled_width < scaled_height) { /* letter */
 138                                 height = scaled_width / pipe_config->pipe_src_w;
 139                                 if (height & 1)
 140                                     height++;
 141                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
 142                                 x = 0;
 143                                 width = adjusted_mode->hdisplay;
 144                         } else {
 145                                 x = y = 0;
 146                                 width = adjusted_mode->hdisplay;
 147                                 height = adjusted_mode->vdisplay;
 148                         }
 149                 }
 150                 break;
 151
 152         case DRM_MODE_SCALE_FULLSCREEN:
 153                 x = y = 0;
 154                 width = adjusted_mode->hdisplay;
 155                 height = adjusted_mode->vdisplay;
 156                 break;
 157
 158         default:
 159                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 160                 return;
 161         }
 162
 163 done:
 164         pipe_config->pch_pfit.pos = (x << 16) | y;
 165         pipe_config->pch_pfit.size = (width << 16) | height;
 166         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 167 }
 168
 169 static void
 170 centre_horizontally(struct drm_display_mode *mode,
 171                     int width)
 172 {
 173         u32 border, sync_pos, blank_width, sync_width;
 174
 175         /* keep the hsync and hblank widths constant */
 176         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 177         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 178         sync_pos = (blank_width - sync_width + 1) / 2;
 179
 180         border = (mode->hdisplay - width + 1) / 2;
 181         border += border & 1; /* make the border even */
 182
 183         mode->crtc_hdisplay = width;
 184         mode->crtc_hblank_start = width + border;
 185         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 186
 187         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 188         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 189 }
 190
 191 static void
 192 centre_vertically(struct drm_display_mode *mode,
 193                   int height)
 194 {
 195         u32 border, sync_pos, blank_width, sync_width;
 196
 197         /* keep the vsync and vblank widths constant */
 198         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 199         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 200         sync_pos = (blank_width - sync_width + 1) / 2;
 201
 202         border = (mode->vdisplay - height + 1) / 2;
 203
 204         mode->crtc_vdisplay = height;
 205         mode->crtc_vblank_start = height + border;
 206         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 207
 208         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 209         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 210 }
 211
 212 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 213 {
 214         /*
 215          * Floating point operation is not supported. So the FACTOR
 216          * is defined, which can avoid the floating point computation
 217          * when calculating the panel ratio.
 218          */
 219 #define ACCURACY 12
 220 #define FACTOR (1 << ACCURACY)
 221         u32 ratio = source * FACTOR / target;
 222         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 223 }
 224
 225 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 226                               u32 *pfit_control)
 227 {
 228         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 229         u32 scaled_width = adjusted_mode->hdisplay *
 230                 pipe_config->pipe_src_h;
 231         u32 scaled_height = pipe_config->pipe_src_w *
 232                 adjusted_mode->vdisplay;
 233
 234         /* 965+ is easy, it does everything in hw */
 235         if (scaled_width > scaled_height)
 236                 *pfit_control |= PFIT_ENABLE |
 237                         PFIT_SCALING_PILLAR;
 238         else if (scaled_width < scaled_height)
 239                 *pfit_control |= PFIT_ENABLE |
 240                         PFIT_SCALING_LETTER;
 241         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 242                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 243 }
 244
 245 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 246                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 247                               u32 *border)
 248 {
 249         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 250         u32 scaled_width = adjusted_mode->hdisplay *
 251                 pipe_config->pipe_src_h;
 252         u32 scaled_height = pipe_config->pipe_src_w *
 253                 adjusted_mode->vdisplay;
 254         u32 bits;
 255
 256         /*
 257          * For earlier chips we have to calculate the scaling
 258          * ratio by hand and program it into the
 259          * PFIT_PGM_RATIO register
 260          */
 261         if (scaled_width > scaled_height) { /* pillar */
 262                 centre_horizontally(adjusted_mode,
 263                                     scaled_height /
 264                                     pipe_config->pipe_src_h);
 265
 266                 *border = LVDS_BORDER_ENABLE;
 267                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 268                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 269                                                     adjusted_mode->vdisplay);
 270
 271                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 272                                              bits << PFIT_VERT_SCALE_SHIFT);
 273                         *pfit_control |= (PFIT_ENABLE |
 274                                           VERT_INTERP_BILINEAR |
 275                                           HORIZ_INTERP_BILINEAR);
 276                 }
 277         } else if (scaled_width < scaled_height) { /* letter */
 278                 centre_vertically(adjusted_mode,
 279                                   scaled_width /
 280                                   pipe_config->pipe_src_w);
 281
 282                 *border = LVDS_BORDER_ENABLE;
 283                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 284                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 285                                                     adjusted_mode->hdisplay);
 286
 287                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 288                                              bits << PFIT_VERT_SCALE_SHIFT);
 289                         *pfit_control |= (PFIT_ENABLE |
 290                                           VERT_INTERP_BILINEAR |
 291                                           HORIZ_INTERP_BILINEAR);
 292                 }
 293         } else {
 294                 /* Aspects match, Let hw scale both directions */
 295                 *pfit_control |= (PFIT_ENABLE |
 296                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 297                                   VERT_INTERP_BILINEAR |
 298                                   HORIZ_INTERP_BILINEAR);
 299         }
 300 }
 301
 302 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 303                               struct intel_crtc_state *pipe_config,
 304                               int fitting_mode)
 305 {
 306         struct drm_device *dev = intel_crtc->base.dev;
 307         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 308         struct drm_display_mode *adjusted_mode;
 309
 310         adjusted_mode = &pipe_config->base.adjusted_mode;
 311
 312         /* Native modes don't need fitting */
 313         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 314             adjusted_mode->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_INFO(dev)->gen >= 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->vdisplay ||
 341                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 342                         pfit_control |= PFIT_ENABLE;
 343                         if (INTEL_INFO(dev)->gen >= 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_INFO(dev)->gen >= 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_INFO(dev)->gen < 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_device *dev)
 380 {
 381         struct drm_i915_private *dev_priv = dev->dev_private;
 382
 383         /* Assume that the BIOS does not lie through the OpRegion... */
 384         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 385                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 386                         connector_status_connected :
 387                         connector_status_disconnected;
 388         }
 389
 390         switch (i915.panel_ignore_lid) {
 391         case -2:
 392                 return connector_status_connected;
 393         case -1:
 394                 return connector_status_disconnected;
 395         default:
 396                 return connector_status_unknown;
 397         }
 398 }
 399
 400 /**
 401  * scale - scale values from one range to another
 402  *
 403  * @source_val: value in range [@source_min..@source_max]
 404  *
 405  * Return @source_val in range [@source_min..@source_max] scaled to range
 406  * [@target_min..@target_max].
 407  */
 408 static uint32_t scale(uint32_t source_val,
 409                       uint32_t source_min, uint32_t source_max,
 410                       uint32_t target_min, uint32_t target_max)
 411 {
 412         uint64_t target_val;
 413
 414         WARN_ON(source_min > source_max);
 415         WARN_ON(target_min > target_max);
 416
 417         /* defensive */
 418         source_val = clamp(source_val, source_min, source_max);
 419
 420         /* avoid overflows */
 421         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 422                         (target_max - target_min), source_max - source_min);
 423         target_val += target_min;
 424
 425         return target_val;
 426 }
 427
 428 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 429 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 430                                    u32 user_level, u32 user_max)
 431 {
 432         struct intel_panel *panel = &connector->panel;
 433
 434         return scale(user_level, 0, user_max,
 435                      panel->backlight.min, panel->backlight.max);
 436 }
 437
 438 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 439  * to [hw_min..hw_max]. */
 440 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 441                                    u32 user_level, u32 user_max)
 442 {
 443         struct intel_panel *panel = &connector->panel;
 444         u32 hw_level;
 445
 446         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 447         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 448
 449         return hw_level;
 450 }
 451
 452 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 453 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 454                                    u32 hw_level, u32 user_max)
 455 {
 456         struct intel_panel *panel = &connector->panel;
 457
 458         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 459                      0, user_max);
 460 }
 461
 462 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 463                                           u32 val)
 464 {
 465         struct drm_device *dev = connector->base.dev;
 466         struct drm_i915_private *dev_priv = dev->dev_private;
 467         struct intel_panel *panel = &connector->panel;
 468
 469         WARN_ON(panel->backlight.max == 0);
 470
 471         if (i915.invert_brightness < 0)
 472                 return val;
 473
 474         if (i915.invert_brightness > 0 ||
 475             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 476                 return panel->backlight.max - val;
 477         }
 478
 479         return val;
 480 }
 481
 482 static u32 bdw_get_backlight(struct intel_connector *connector)
 483 {
 484         struct drm_device *dev = connector->base.dev;
 485         struct drm_i915_private *dev_priv = dev->dev_private;
 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_device *dev = connector->base.dev;
 493         struct drm_i915_private *dev_priv = dev->dev_private;
 494
 495         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 496 }
 497
 498 static u32 i9xx_get_backlight(struct intel_connector *connector)
 499 {
 500         struct drm_device *dev = connector->base.dev;
 501         struct drm_i915_private *dev_priv = dev->dev_private;
 502         struct intel_panel *panel = &connector->panel;
 503         u32 val;
 504
 505         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 506         if (INTEL_INFO(dev)->gen < 4)
 507                 val >>= 1;
 508
 509         if (panel->backlight.combination_mode) {
 510                 u8 lbpc;
 511
 512                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 513                 val *= lbpc;
 514         }
 515
 516         return val;
 517 }
 518
 519 static u32 _vlv_get_backlight(struct drm_device *dev, enum i915_pipe pipe)
 520 {
 521         struct drm_i915_private *dev_priv = dev->dev_private;
 522
 523         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 524                 return 0;
 525
 526         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 527 }
 528
 529 static u32 vlv_get_backlight(struct intel_connector *connector)
 530 {
 531         struct drm_device *dev = connector->base.dev;
 532         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 533
 534         return _vlv_get_backlight(dev, pipe);
 535 }
 536
 537 static u32 bxt_get_backlight(struct intel_connector *connector)
 538 {
 539         struct drm_device *dev = connector->base.dev;
 540         struct drm_i915_private *dev_priv = dev->dev_private;
 541
 542         return I915_READ(BXT_BLC_PWM_DUTY1);
 543 }
 544
 545 #if 0
 546 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 547 {
 548         struct drm_device *dev = connector->base.dev;
 549         struct drm_i915_private *dev_priv = dev->dev_private;
 550         struct intel_panel *panel = &connector->panel;
 551         u32 val = 0;
 552
 553         mutex_lock(&dev_priv->backlight_lock);
 554
 555         if (panel->backlight.enabled) {
 556                 val = dev_priv->display.get_backlight(connector);
 557                 val = intel_panel_compute_brightness(connector, val);
 558         }
 559
 560         mutex_unlock(&dev_priv->backlight_lock);
 561
 562         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 563         return val;
 564 }
 565 #endif
 566
 567 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 568 {
 569         struct drm_device *dev = connector->base.dev;
 570         struct drm_i915_private *dev_priv = dev->dev_private;
 571         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 572         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 573 }
 574
 575 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 576 {
 577         struct drm_device *dev = connector->base.dev;
 578         struct drm_i915_private *dev_priv = dev->dev_private;
 579         u32 tmp;
 580
 581         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 582         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 583 }
 584
 585 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 586 {
 587         struct drm_device *dev = connector->base.dev;
 588         struct drm_i915_private *dev_priv = dev->dev_private;
 589         struct intel_panel *panel = &connector->panel;
 590         u32 tmp, mask;
 591
 592         WARN_ON(panel->backlight.max == 0);
 593
 594         if (panel->backlight.combination_mode) {
 595                 u8 lbpc;
 596
 597                 lbpc = level * 0xfe / panel->backlight.max + 1;
 598                 level /= lbpc;
 599                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 600         }
 601
 602         if (IS_GEN4(dev)) {
 603                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 604         } else {
 605                 level <<= 1;
 606                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 607         }
 608
 609         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 610         I915_WRITE(BLC_PWM_CTL, tmp | level);
 611 }
 612
 613 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 614 {
 615         struct drm_device *dev = connector->base.dev;
 616         struct drm_i915_private *dev_priv = dev->dev_private;
 617         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 618         u32 tmp;
 619
 620         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 621                 return;
 622
 623         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 624         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 625 }
 626
 627 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
 628 {
 629         struct drm_device *dev = connector->base.dev;
 630         struct drm_i915_private *dev_priv = dev->dev_private;
 631
 632         I915_WRITE(BXT_BLC_PWM_DUTY1, level);
 633 }
 634
 635 static void
 636 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 637 {
 638         struct drm_device *dev = connector->base.dev;
 639         struct drm_i915_private *dev_priv = dev->dev_private;
 640
 641         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 642
 643         level = intel_panel_compute_brightness(connector, level);
 644         dev_priv->display.set_backlight(connector, level);
 645 }
 646
 647 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 648 static void intel_panel_set_backlight(struct intel_connector *connector,
 649                                       u32 user_level, u32 user_max)
 650 {
 651         struct drm_device *dev = connector->base.dev;
 652         struct drm_i915_private *dev_priv = dev->dev_private;
 653         struct intel_panel *panel = &connector->panel;
 654         u32 hw_level;
 655
 656         if (!panel->backlight.present)
 657                 return;
 658
 659         mutex_lock(&dev_priv->backlight_lock);
 660
 661         WARN_ON(panel->backlight.max == 0);
 662
 663         hw_level = scale_user_to_hw(connector, user_level, user_max);
 664         panel->backlight.level = hw_level;
 665
 666         if (panel->backlight.enabled)
 667                 intel_panel_actually_set_backlight(connector, hw_level);
 668
 669         mutex_unlock(&dev_priv->backlight_lock);
 670 }
 671
 672 /* set backlight brightness to level in range [0..max], assuming hw min is
 673  * respected.
 674  */
 675 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 676                                     u32 user_level, u32 user_max)
 677 {
 678         struct drm_device *dev = connector->base.dev;
 679         struct drm_i915_private *dev_priv = dev->dev_private;
 680         struct intel_panel *panel = &connector->panel;
 681         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 682         u32 hw_level;
 683
 684         /*
 685          * INVALID_PIPE may occur during driver init because
 686          * connection_mutex isn't held across the entire backlight
 687          * setup + modeset readout, and the BIOS can issue the
 688          * requests at any time.
 689          */
 690         if (!panel->backlight.present || pipe == INVALID_PIPE)
 691                 return;
 692
 693         mutex_lock(&dev_priv->backlight_lock);
 694
 695         WARN_ON(panel->backlight.max == 0);
 696
 697         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 698         panel->backlight.level = hw_level;
 699
 700         if (panel->backlight.device)
 701                 panel->backlight.device->props.brightness =
 702                         scale_hw_to_user(connector,
 703                                          panel->backlight.level,
 704                                          panel->backlight.device->props.max_brightness);
 705
 706         if (panel->backlight.enabled)
 707                 intel_panel_actually_set_backlight(connector, hw_level);
 708
 709         mutex_unlock(&dev_priv->backlight_lock);
 710 }
 711
 712 static void pch_disable_backlight(struct intel_connector *connector)
 713 {
 714         struct drm_device *dev = connector->base.dev;
 715         struct drm_i915_private *dev_priv = dev->dev_private;
 716         u32 tmp;
 717
 718         intel_panel_actually_set_backlight(connector, 0);
 719
 720         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 721         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 722
 723         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 724         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 725 }
 726
 727 static void i9xx_disable_backlight(struct intel_connector *connector)
 728 {
 729         intel_panel_actually_set_backlight(connector, 0);
 730 }
 731
 732 static void i965_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_CTL2);
 741         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 742 }
 743
 744 static void vlv_disable_backlight(struct intel_connector *connector)
 745 {
 746         struct drm_device *dev = connector->base.dev;
 747         struct drm_i915_private *dev_priv = dev->dev_private;
 748         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 749         u32 tmp;
 750
 751         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 752                 return;
 753
 754         intel_panel_actually_set_backlight(connector, 0);
 755
 756         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 757         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 758 }
 759
 760 static void bxt_disable_backlight(struct intel_connector *connector)
 761 {
 762         struct drm_device *dev = connector->base.dev;
 763         struct drm_i915_private *dev_priv = dev->dev_private;
 764         u32 tmp;
 765
 766         intel_panel_actually_set_backlight(connector, 0);
 767
 768         tmp = I915_READ(BXT_BLC_PWM_CTL1);
 769         I915_WRITE(BXT_BLC_PWM_CTL1, tmp & ~BXT_BLC_PWM_ENABLE);
 770 }
 771
 772 void intel_panel_disable_backlight(struct intel_connector *connector)
 773 {
 774         struct drm_device *dev = connector->base.dev;
 775         struct drm_i915_private *dev_priv = dev->dev_private;
 776         struct intel_panel *panel = &connector->panel;
 777
 778         if (!panel->backlight.present)
 779                 return;
 780
 781         /*
 782          * Do not disable backlight on the vgaswitcheroo path. When switching
 783          * away from i915, the other client may depend on i915 to handle the
 784          * backlight. This will leave the backlight on unnecessarily when
 785          * another client is not activated.
 786          */
 787         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 788                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 789                 return;
 790         }
 791
 792         mutex_lock(&dev_priv->backlight_lock);
 793
 794         if (panel->backlight.device)
 795                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 796         panel->backlight.enabled = false;
 797         dev_priv->display.disable_backlight(connector);
 798
 799         mutex_unlock(&dev_priv->backlight_lock);
 800 }
 801
 802 static void bdw_enable_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         u32 pch_ctl1, pch_ctl2;
 808
 809         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 810         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 811                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 812                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 813                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 814         }
 815
 816         pch_ctl2 = panel->backlight.max << 16;
 817         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 818
 819         pch_ctl1 = 0;
 820         if (panel->backlight.active_low_pwm)
 821                 pch_ctl1 |= BLM_PCH_POLARITY;
 822
 823         /* After LPT, override is the default. */
 824         if (HAS_PCH_LPT(dev_priv))
 825                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 826
 827         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 828         POSTING_READ(BLC_PWM_PCH_CTL1);
 829         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 830
 831         /* This won't stick until the above enable. */
 832         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 833 }
 834
 835 static void pch_enable_backlight(struct intel_connector *connector)
 836 {
 837         struct drm_device *dev = connector->base.dev;
 838         struct drm_i915_private *dev_priv = dev->dev_private;
 839         struct intel_panel *panel = &connector->panel;
 840         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 841         enum transcoder cpu_transcoder =
 842                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 843         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 844
 845         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 846         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 847                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 848                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 849                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 850         }
 851
 852         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 853         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 854                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 855                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 856                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 857         }
 858
 859         if (cpu_transcoder == TRANSCODER_EDP)
 860                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 861         else
 862                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 863         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 864         POSTING_READ(BLC_PWM_CPU_CTL2);
 865         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 866
 867         /* This won't stick until the above enable. */
 868         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 869
 870         pch_ctl2 = panel->backlight.max << 16;
 871         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 872
 873         pch_ctl1 = 0;
 874         if (panel->backlight.active_low_pwm)
 875                 pch_ctl1 |= BLM_PCH_POLARITY;
 876
 877         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 878         POSTING_READ(BLC_PWM_PCH_CTL1);
 879         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 880 }
 881
 882 static void i9xx_enable_backlight(struct intel_connector *connector)
 883 {
 884         struct drm_device *dev = connector->base.dev;
 885         struct drm_i915_private *dev_priv = dev->dev_private;
 886         struct intel_panel *panel = &connector->panel;
 887         u32 ctl, freq;
 888
 889         ctl = I915_READ(BLC_PWM_CTL);
 890         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 891                 DRM_DEBUG_KMS("backlight already enabled\n");
 892                 I915_WRITE(BLC_PWM_CTL, 0);
 893         }
 894
 895         freq = panel->backlight.max;
 896         if (panel->backlight.combination_mode)
 897                 freq /= 0xff;
 898
 899         ctl = freq << 17;
 900         if (panel->backlight.combination_mode)
 901                 ctl |= BLM_LEGACY_MODE;
 902         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 903                 ctl |= BLM_POLARITY_PNV;
 904
 905         I915_WRITE(BLC_PWM_CTL, ctl);
 906         POSTING_READ(BLC_PWM_CTL);
 907
 908         /* XXX: combine this into above write? */
 909         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 910
 911         /*
 912          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 913          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 914          * that has backlight.
 915          */
 916         if (IS_GEN2(dev))
 917                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 918 }
 919
 920 static void i965_enable_backlight(struct intel_connector *connector)
 921 {
 922         struct drm_device *dev = connector->base.dev;
 923         struct drm_i915_private *dev_priv = dev->dev_private;
 924         struct intel_panel *panel = &connector->panel;
 925         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 926         u32 ctl, ctl2, freq;
 927
 928         ctl2 = I915_READ(BLC_PWM_CTL2);
 929         if (ctl2 & BLM_PWM_ENABLE) {
 930                 DRM_DEBUG_KMS("backlight already enabled\n");
 931                 ctl2 &= ~BLM_PWM_ENABLE;
 932                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 933         }
 934
 935         freq = panel->backlight.max;
 936         if (panel->backlight.combination_mode)
 937                 freq /= 0xff;
 938
 939         ctl = freq << 16;
 940         I915_WRITE(BLC_PWM_CTL, ctl);
 941
 942         ctl2 = BLM_PIPE(pipe);
 943         if (panel->backlight.combination_mode)
 944                 ctl2 |= BLM_COMBINATION_MODE;
 945         if (panel->backlight.active_low_pwm)
 946                 ctl2 |= BLM_POLARITY_I965;
 947         I915_WRITE(BLC_PWM_CTL2, ctl2);
 948         POSTING_READ(BLC_PWM_CTL2);
 949         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 950
 951         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 952 }
 953
 954 static void vlv_enable_backlight(struct intel_connector *connector)
 955 {
 956         struct drm_device *dev = connector->base.dev;
 957         struct drm_i915_private *dev_priv = dev->dev_private;
 958         struct intel_panel *panel = &connector->panel;
 959         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 960         u32 ctl, ctl2;
 961
 962         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 963                 return;
 964
 965         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 966         if (ctl2 & BLM_PWM_ENABLE) {
 967                 DRM_DEBUG_KMS("backlight already enabled\n");
 968                 ctl2 &= ~BLM_PWM_ENABLE;
 969                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 970         }
 971
 972         ctl = panel->backlight.max << 16;
 973         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 974
 975         /* XXX: combine this into above write? */
 976         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 977
 978         ctl2 = 0;
 979         if (panel->backlight.active_low_pwm)
 980                 ctl2 |= BLM_POLARITY_I965;
 981         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 982         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 983         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 984 }
 985
 986 static void bxt_enable_backlight(struct intel_connector *connector)
 987 {
 988         struct drm_device *dev = connector->base.dev;
 989         struct drm_i915_private *dev_priv = dev->dev_private;
 990         struct intel_panel *panel = &connector->panel;
 991         u32 pwm_ctl;
 992
 993         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
 994         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
 995                 DRM_DEBUG_KMS("backlight already enabled\n");
 996                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
 997                 I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
 998         }
 999
1000         I915_WRITE(BXT_BLC_PWM_FREQ1, panel->backlight.max);
1001
1002         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1003
1004         pwm_ctl = 0;
1005         if (panel->backlight.active_low_pwm)
1006                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1007
1008         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1009         POSTING_READ(BXT_BLC_PWM_CTL1);
1010         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl | BXT_BLC_PWM_ENABLE);
1011 }
1012
1013 void intel_panel_enable_backlight(struct intel_connector *connector)
1014 {
1015         struct drm_device *dev = connector->base.dev;
1016         struct drm_i915_private *dev_priv = dev->dev_private;
1017         struct intel_panel *panel = &connector->panel;
1018         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
1019
1020         if (!panel->backlight.present)
1021                 return;
1022
1023         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1024
1025         mutex_lock(&dev_priv->backlight_lock);
1026
1027         WARN_ON(panel->backlight.max == 0);
1028
1029         if (panel->backlight.level <= panel->backlight.min) {
1030                 panel->backlight.level = panel->backlight.max;
1031                 if (panel->backlight.device)
1032                         panel->backlight.device->props.brightness =
1033                                 scale_hw_to_user(connector,
1034                                                  panel->backlight.level,
1035                                                  panel->backlight.device->props.max_brightness);
1036         }
1037
1038         dev_priv->display.enable_backlight(connector);
1039         panel->backlight.enabled = true;
1040         if (panel->backlight.device)
1041                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1042
1043         mutex_unlock(&dev_priv->backlight_lock);
1044 }
1045
1046 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1047 static int intel_backlight_device_update_status(struct backlight_device *bd)
1048 {
1049 #if 0
1050         struct intel_connector *connector = bl_get_data(bd);
1051         struct intel_panel *panel = &connector->panel;
1052         struct drm_device *dev = connector->base.dev;
1053
1054         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1055         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1056                       bd->props.brightness, bd->props.max_brightness);
1057         intel_panel_set_backlight(connector, bd->props.brightness,
1058                                   bd->props.max_brightness);
1059
1060         /*
1061          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1062          * backlight class device does not make it easy to to differentiate
1063          * between callbacks for brightness and bl_power, so our backlight_power
1064          * callback needs to take this into account.
1065          */
1066         if (panel->backlight.enabled) {
1067                 if (panel->backlight_power) {
1068                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1069                                 bd->props.brightness != 0;
1070                         panel->backlight_power(connector, enable);
1071                 }
1072         } else {
1073                 bd->props.power = FB_BLANK_POWERDOWN;
1074         }
1075
1076         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1077 #endif
1078         return 0;
1079 }
1080
1081 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1082 {
1083 #if 0
1084         struct intel_connector *connector = bl_get_data(bd);
1085         struct drm_device *dev = connector->base.dev;
1086         struct drm_i915_private *dev_priv = dev->dev_private;
1087         u32 hw_level;
1088         int ret;
1089
1090         intel_runtime_pm_get(dev_priv);
1091         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1092
1093         hw_level = intel_panel_get_backlight(connector);
1094         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1095
1096         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1097         intel_runtime_pm_put(dev_priv);
1098
1099         return ret;
1100 #endif
1101         return 0;
1102 }
1103
1104 static const struct backlight_ops intel_backlight_device_ops = {
1105         .update_status = intel_backlight_device_update_status,
1106         .get_brightness = intel_backlight_device_get_brightness,
1107 };
1108
1109 static int intel_backlight_device_register(struct intel_connector *connector)
1110 {
1111         struct intel_panel *panel = &connector->panel;
1112         struct backlight_properties props;
1113
1114         if (WARN_ON(panel->backlight.device))
1115                 return -ENODEV;
1116
1117         if (!panel->backlight.present)
1118                 return 0;
1119
1120         WARN_ON(panel->backlight.max == 0);
1121
1122         memset(&props, 0, sizeof(props));
1123         props.type = BACKLIGHT_RAW;
1124
1125         /*
1126          * Note: Everything should work even if the backlight device max
1127          * presented to the userspace is arbitrarily chosen.
1128          */
1129         props.max_brightness = panel->backlight.max;
1130         props.brightness = scale_hw_to_user(connector,
1131                                             panel->backlight.level,
1132                                             props.max_brightness);
1133
1134         if (panel->backlight.enabled)
1135                 props.power = FB_BLANK_UNBLANK;
1136         else
1137                 props.power = FB_BLANK_POWERDOWN;
1138
1139         /*
1140          * Note: using the same name independent of the connector prevents
1141          * registration of multiple backlight devices in the driver.
1142          */
1143 #if 0
1144         panel->backlight.device =
1145                 backlight_device_register("intel_backlight",
1146                                           connector->base.kdev,
1147                                           connector,
1148                                           &intel_backlight_device_ops, &props);
1149
1150         if (IS_ERR(panel->backlight.device)) {
1151                 DRM_ERROR("Failed to register backlight: %ld\n",
1152                           PTR_ERR(panel->backlight.device));
1153                 panel->backlight.device = NULL;
1154                 return -ENODEV;
1155         }
1156 #endif
1157
1158         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1159                       connector->base.name);
1160
1161         return 0;
1162 }
1163
1164 static void intel_backlight_device_unregister(struct intel_connector *connector)
1165 {
1166 #if 0
1167         struct intel_panel *panel = &connector->panel;
1168
1169         if (panel->backlight.device) {
1170                 backlight_device_unregister(panel->backlight.device);
1171                 panel->backlight.device = NULL;
1172         }
1173 #endif
1174 }
1175 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1176 static int intel_backlight_device_register(struct intel_connector *connector)
1177 {
1178         return 0;
1179 }
1180 static void intel_backlight_device_unregister(struct intel_connector *connector)
1181 {
1182 }
1183 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1184
1185 /*
1186  * Note: The setup hooks can't assume pipe is set!
1187  *
1188  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1189  * appropriately when it's 0. Use VBT and/or sane defaults.
1190  */
1191 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1192 {
1193         struct drm_device *dev = connector->base.dev;
1194         struct drm_i915_private *dev_priv = dev->dev_private;
1195         struct intel_panel *panel = &connector->panel;
1196         int min;
1197
1198         WARN_ON(panel->backlight.max == 0);
1199
1200         /*
1201          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1202          * to problems. There are such machines out there. Either our
1203          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1204          * against this by letting the minimum be at most (arbitrarily chosen)
1205          * 25% of the max.
1206          */
1207         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1208         if (min != dev_priv->vbt.backlight.min_brightness) {
1209                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1210                               dev_priv->vbt.backlight.min_brightness, min);
1211         }
1212
1213         /* vbt value is a coefficient in range [0..255] */
1214         return scale(min, 0, 255, 0, panel->backlight.max);
1215 }
1216
1217 static int bdw_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1218 {
1219         struct drm_device *dev = connector->base.dev;
1220         struct drm_i915_private *dev_priv = dev->dev_private;
1221         struct intel_panel *panel = &connector->panel;
1222         u32 pch_ctl1, pch_ctl2, val;
1223
1224         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1225         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1226
1227         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1228         panel->backlight.max = pch_ctl2 >> 16;
1229         if (!panel->backlight.max)
1230                 return -ENODEV;
1231
1232         panel->backlight.min = get_backlight_min_vbt(connector);
1233
1234         val = bdw_get_backlight(connector);
1235         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1236
1237         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1238                 panel->backlight.level != 0;
1239
1240         return 0;
1241 }
1242
1243 static int pch_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1244 {
1245         struct drm_device *dev = connector->base.dev;
1246         struct drm_i915_private *dev_priv = dev->dev_private;
1247         struct intel_panel *panel = &connector->panel;
1248         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1249
1250         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1251         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1252
1253         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1254         panel->backlight.max = pch_ctl2 >> 16;
1255         if (!panel->backlight.max)
1256                 return -ENODEV;
1257
1258         panel->backlight.min = get_backlight_min_vbt(connector);
1259
1260         val = pch_get_backlight(connector);
1261         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1262
1263         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1264         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1265                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1266
1267         return 0;
1268 }
1269
1270 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1271 {
1272         struct drm_device *dev = connector->base.dev;
1273         struct drm_i915_private *dev_priv = dev->dev_private;
1274         struct intel_panel *panel = &connector->panel;
1275         u32 ctl, val;
1276
1277         ctl = I915_READ(BLC_PWM_CTL);
1278
1279         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1280                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1281
1282         if (IS_PINEVIEW(dev))
1283                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1284
1285         panel->backlight.max = ctl >> 17;
1286         if (panel->backlight.combination_mode)
1287                 panel->backlight.max *= 0xff;
1288
1289         if (!panel->backlight.max)
1290                 return -ENODEV;
1291
1292         panel->backlight.min = get_backlight_min_vbt(connector);
1293
1294         val = i9xx_get_backlight(connector);
1295         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1296
1297         panel->backlight.enabled = panel->backlight.level != 0;
1298
1299         return 0;
1300 }
1301
1302 static int i965_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1303 {
1304         struct drm_device *dev = connector->base.dev;
1305         struct drm_i915_private *dev_priv = dev->dev_private;
1306         struct intel_panel *panel = &connector->panel;
1307         u32 ctl, ctl2, val;
1308
1309         ctl2 = I915_READ(BLC_PWM_CTL2);
1310         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1311         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1312
1313         ctl = I915_READ(BLC_PWM_CTL);
1314         panel->backlight.max = ctl >> 16;
1315         if (panel->backlight.combination_mode)
1316                 panel->backlight.max *= 0xff;
1317
1318         if (!panel->backlight.max)
1319                 return -ENODEV;
1320
1321         panel->backlight.min = get_backlight_min_vbt(connector);
1322
1323         val = i9xx_get_backlight(connector);
1324         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1325
1326         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1327                 panel->backlight.level != 0;
1328
1329         return 0;
1330 }
1331
1332 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_pipe pipe)
1333 {
1334         struct drm_device *dev = connector->base.dev;
1335         struct drm_i915_private *dev_priv = dev->dev_private;
1336         struct intel_panel *panel = &connector->panel;
1337         enum i915_pipe p;
1338         u32 ctl, ctl2, val;
1339
1340         for_each_pipe(dev_priv, p) {
1341                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1342
1343                 /* Skip if the modulation freq is already set */
1344                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1345                         continue;
1346
1347                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1348                 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1349                            cur_val);
1350         }
1351
1352         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1353                 return -ENODEV;
1354
1355         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1356         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1357
1358         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1359         panel->backlight.max = ctl >> 16;
1360         if (!panel->backlight.max)
1361                 return -ENODEV;
1362
1363         panel->backlight.min = get_backlight_min_vbt(connector);
1364
1365         val = _vlv_get_backlight(dev, pipe);
1366         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1367
1368         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1369                 panel->backlight.level != 0;
1370
1371         return 0;
1372 }
1373
1374 #ifdef __DragonFly__
1375 /*
1376  * Read max backlight level
1377  */
1378 static int
1379 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1380 {
1381         int err, val;
1382         struct intel_connector *connector = arg1;
1383         struct drm_device *dev = connector->base.dev;
1384         struct drm_i915_private *dev_priv = dev->dev_private;
1385         struct intel_panel *panel = &connector->panel;
1386
1387         mutex_lock(&dev_priv->backlight_lock);
1388         val = panel->backlight.max;
1389         mutex_unlock(&dev_priv->backlight_lock);
1390
1391         err = sysctl_handle_int(oidp, &val, 0, req);
1392         return(err);
1393 }
1394
1395 /*
1396  * Read/write backlight level
1397  */
1398 static int
1399 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1400 {
1401         struct intel_connector *connector = arg1;
1402         struct drm_device *dev = connector->base.dev;
1403         struct drm_i915_private *dev_priv = dev->dev_private;
1404         struct intel_panel *panel = &connector->panel;
1405         int err, val;
1406         u32 user_level, max_brightness;
1407
1408         mutex_lock(&dev_priv->backlight_lock);
1409         max_brightness = panel->backlight.max;
1410         user_level = scale_hw_to_user(connector, panel->backlight.level,
1411             max_brightness);
1412         mutex_unlock(&dev_priv->backlight_lock);
1413
1414         val = user_level;
1415         err = sysctl_handle_int(oidp, &val, 0, req);
1416         if (err != 0 || req->newptr == NULL) {
1417                 return(err);
1418         }
1419
1420         if (val != user_level && val >= 0 && val <= max_brightness) {
1421                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1422                 intel_panel_set_backlight(arg1, val, max_brightness);
1423                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1424         }
1425
1426         return(err);
1427 }
1428 #endif /* __DragonFly__ */
1429
1430 static int
1431 bxt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1432 {
1433         struct drm_device *dev = connector->base.dev;
1434         struct drm_i915_private *dev_priv = dev->dev_private;
1435         struct intel_panel *panel = &connector->panel;
1436         u32 pwm_ctl, val;
1437
1438         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1439         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1440
1441         panel->backlight.max = I915_READ(BXT_BLC_PWM_FREQ1);
1442         if (!panel->backlight.max)
1443                 return -ENODEV;
1444
1445         val = bxt_get_backlight(connector);
1446         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1447
1448         panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1449                 panel->backlight.level != 0;
1450
1451         return 0;
1452 }
1453
1454 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe)
1455 {
1456         struct drm_device *dev = connector->dev;
1457         struct drm_i915_private *dev_priv = dev->dev_private;
1458         struct intel_connector *intel_connector = to_intel_connector(connector);
1459         struct intel_panel *panel = &intel_connector->panel;
1460         int ret;
1461
1462         if (!dev_priv->vbt.backlight.present) {
1463                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1464                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1465                 } else {
1466                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1467                         return 0;
1468                 }
1469         }
1470
1471         /* set level and max in panel struct */
1472         mutex_lock(&dev_priv->backlight_lock);
1473         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1474         mutex_unlock(&dev_priv->backlight_lock);
1475
1476         if (ret) {
1477                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1478                               connector->name);
1479                 return ret;
1480         }
1481
1482         panel->backlight.present = true;
1483
1484 #ifdef __DragonFly__
1485         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1486                         OID_AUTO, "backlight_max",
1487                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1488                         connector, sizeof(int),
1489                         sysctl_backlight_max,
1490                         "I", "Max backlight level");
1491         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1492                         OID_AUTO, "backlight_level",
1493                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1494                         connector, sizeof(int),
1495                         sysctl_backlight_handler,
1496                         "I", "Backlight level");
1497 #endif
1498
1499         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1500                       connector->name,
1501                       panel->backlight.enabled ? "enabled" : "disabled",
1502                       panel->backlight.level, panel->backlight.max);
1503
1504         return 0;
1505 }
1506
1507 void intel_panel_destroy_backlight(struct drm_connector *connector)
1508 {
1509         struct intel_connector *intel_connector = to_intel_connector(connector);
1510         struct intel_panel *panel = &intel_connector->panel;
1511
1512         panel->backlight.present = false;
1513 }
1514
1515 /* Set up chip specific backlight functions */
1516 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1517 {
1518         struct drm_i915_private *dev_priv = dev->dev_private;
1519
1520         if (IS_BROXTON(dev)) {
1521                 dev_priv->display.setup_backlight = bxt_setup_backlight;
1522                 dev_priv->display.enable_backlight = bxt_enable_backlight;
1523                 dev_priv->display.disable_backlight = bxt_disable_backlight;
1524                 dev_priv->display.set_backlight = bxt_set_backlight;
1525                 dev_priv->display.get_backlight = bxt_get_backlight;
1526         } else if (IS_BROADWELL(dev) || IS_SKYLAKE(dev)) {
1527                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1528                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1529                 dev_priv->display.disable_backlight = pch_disable_backlight;
1530                 dev_priv->display.set_backlight = bdw_set_backlight;
1531                 dev_priv->display.get_backlight = bdw_get_backlight;
1532         } else if (HAS_PCH_SPLIT(dev)) {
1533                 dev_priv->display.setup_backlight = pch_setup_backlight;
1534                 dev_priv->display.enable_backlight = pch_enable_backlight;
1535                 dev_priv->display.disable_backlight = pch_disable_backlight;
1536                 dev_priv->display.set_backlight = pch_set_backlight;
1537                 dev_priv->display.get_backlight = pch_get_backlight;
1538         } else if (IS_VALLEYVIEW(dev)) {
1539                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1540                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1541                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1542                 dev_priv->display.set_backlight = vlv_set_backlight;
1543                 dev_priv->display.get_backlight = vlv_get_backlight;
1544         } else if (IS_GEN4(dev)) {
1545                 dev_priv->display.setup_backlight = i965_setup_backlight;
1546                 dev_priv->display.enable_backlight = i965_enable_backlight;
1547                 dev_priv->display.disable_backlight = i965_disable_backlight;
1548                 dev_priv->display.set_backlight = i9xx_set_backlight;
1549                 dev_priv->display.get_backlight = i9xx_get_backlight;
1550         } else {
1551                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1552                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1553                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1554                 dev_priv->display.set_backlight = i9xx_set_backlight;
1555                 dev_priv->display.get_backlight = i9xx_get_backlight;
1556         }
1557 }
1558
1559 int intel_panel_init(struct intel_panel *panel,
1560                      struct drm_display_mode *fixed_mode,
1561                      struct drm_display_mode *downclock_mode)
1562 {
1563         panel->fixed_mode = fixed_mode;
1564         panel->downclock_mode = downclock_mode;
1565
1566         return 0;
1567 }
1568
1569 void intel_panel_fini(struct intel_panel *panel)
1570 {
1571         struct intel_connector *intel_connector =
1572                 container_of(panel, struct intel_connector, panel);
1573
1574         if (panel->fixed_mode)
1575                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1576
1577         if (panel->downclock_mode)
1578                 drm_mode_destroy(intel_connector->base.dev,
1579                                 panel->downclock_mode);
1580 }
1581
1582 void intel_backlight_register(struct drm_device *dev)
1583 {
1584         struct intel_connector *connector;
1585
1586         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1587                 intel_backlight_device_register(connector);
1588 }
1589
1590 void intel_backlight_unregister(struct drm_device *dev)
1591 {
1592         struct intel_connector *connector;
1593
1594         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1595                 intel_backlight_device_unregister(connector);
1596 }