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 #if 0
 538 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 539 {
 540         struct drm_device *dev = connector->base.dev;
 541         struct drm_i915_private *dev_priv = dev->dev_private;
 542         struct intel_panel *panel = &connector->panel;
 543         u32 val = 0;
 544
 545         mutex_lock(&dev_priv->backlight_lock);
 546
 547         if (panel->backlight.enabled) {
 548                 val = dev_priv->display.get_backlight(connector);
 549                 val = intel_panel_compute_brightness(connector, val);
 550         }
 551
 552         mutex_unlock(&dev_priv->backlight_lock);
 553
 554         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 555         return val;
 556 }
 557 #endif
 558
 559 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 560 {
 561         struct drm_device *dev = connector->base.dev;
 562         struct drm_i915_private *dev_priv = dev->dev_private;
 563         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 564         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 565 }
 566
 567 static void pch_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 tmp;
 572
 573         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 574         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 575 }
 576
 577 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 578 {
 579         struct drm_device *dev = connector->base.dev;
 580         struct drm_i915_private *dev_priv = dev->dev_private;
 581         struct intel_panel *panel = &connector->panel;
 582         u32 tmp, mask;
 583
 584         WARN_ON(panel->backlight.max == 0);
 585
 586         if (panel->backlight.combination_mode) {
 587                 u8 lbpc;
 588
 589                 lbpc = level * 0xfe / panel->backlight.max + 1;
 590                 level /= lbpc;
 591                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 592         }
 593
 594         if (IS_GEN4(dev)) {
 595                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 596         } else {
 597                 level <<= 1;
 598                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 599         }
 600
 601         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 602         I915_WRITE(BLC_PWM_CTL, tmp | level);
 603 }
 604
 605 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 606 {
 607         struct drm_device *dev = connector->base.dev;
 608         struct drm_i915_private *dev_priv = dev->dev_private;
 609         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 610         u32 tmp;
 611
 612         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 613                 return;
 614
 615         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 616         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 617 }
 618
 619 static void
 620 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 621 {
 622         struct drm_device *dev = connector->base.dev;
 623         struct drm_i915_private *dev_priv = dev->dev_private;
 624
 625         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 626
 627         level = intel_panel_compute_brightness(connector, level);
 628         dev_priv->display.set_backlight(connector, level);
 629 }
 630
 631 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 632 static void intel_panel_set_backlight(struct intel_connector *connector,
 633                                       u32 user_level, u32 user_max)
 634 {
 635         struct drm_device *dev = connector->base.dev;
 636         struct drm_i915_private *dev_priv = dev->dev_private;
 637         struct intel_panel *panel = &connector->panel;
 638         u32 hw_level;
 639
 640         if (!panel->backlight.present)
 641                 return;
 642
 643         mutex_lock(&dev_priv->backlight_lock);
 644
 645         WARN_ON(panel->backlight.max == 0);
 646
 647         hw_level = scale_user_to_hw(connector, user_level, user_max);
 648         panel->backlight.level = hw_level;
 649
 650         if (panel->backlight.enabled)
 651                 intel_panel_actually_set_backlight(connector, hw_level);
 652
 653         mutex_unlock(&dev_priv->backlight_lock);
 654 }
 655
 656 /* set backlight brightness to level in range [0..max], assuming hw min is
 657  * respected.
 658  */
 659 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 660                                     u32 user_level, u32 user_max)
 661 {
 662         struct drm_device *dev = connector->base.dev;
 663         struct drm_i915_private *dev_priv = dev->dev_private;
 664         struct intel_panel *panel = &connector->panel;
 665         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 666         u32 hw_level;
 667
 668         /*
 669          * INVALID_PIPE may occur during driver init because
 670          * connection_mutex isn't held across the entire backlight
 671          * setup + modeset readout, and the BIOS can issue the
 672          * requests at any time.
 673          */
 674         if (!panel->backlight.present || pipe == INVALID_PIPE)
 675                 return;
 676
 677         mutex_lock(&dev_priv->backlight_lock);
 678
 679         WARN_ON(panel->backlight.max == 0);
 680
 681         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 682         panel->backlight.level = hw_level;
 683
 684         if (panel->backlight.device)
 685                 panel->backlight.device->props.brightness =
 686                         scale_hw_to_user(connector,
 687                                          panel->backlight.level,
 688                                          panel->backlight.device->props.max_brightness);
 689
 690         if (panel->backlight.enabled)
 691                 intel_panel_actually_set_backlight(connector, hw_level);
 692
 693         mutex_unlock(&dev_priv->backlight_lock);
 694 }
 695
 696 static void pch_disable_backlight(struct intel_connector *connector)
 697 {
 698         struct drm_device *dev = connector->base.dev;
 699         struct drm_i915_private *dev_priv = dev->dev_private;
 700         u32 tmp;
 701
 702         intel_panel_actually_set_backlight(connector, 0);
 703
 704         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 705         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 706
 707         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 708         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 709 }
 710
 711 static void i9xx_disable_backlight(struct intel_connector *connector)
 712 {
 713         intel_panel_actually_set_backlight(connector, 0);
 714 }
 715
 716 static void i965_disable_backlight(struct intel_connector *connector)
 717 {
 718         struct drm_device *dev = connector->base.dev;
 719         struct drm_i915_private *dev_priv = dev->dev_private;
 720         u32 tmp;
 721
 722         intel_panel_actually_set_backlight(connector, 0);
 723
 724         tmp = I915_READ(BLC_PWM_CTL2);
 725         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 726 }
 727
 728 static void vlv_disable_backlight(struct intel_connector *connector)
 729 {
 730         struct drm_device *dev = connector->base.dev;
 731         struct drm_i915_private *dev_priv = dev->dev_private;
 732         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 733         u32 tmp;
 734
 735         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 736                 return;
 737
 738         intel_panel_actually_set_backlight(connector, 0);
 739
 740         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 741         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 742 }
 743
 744 void intel_panel_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         struct intel_panel *panel = &connector->panel;
 749
 750         if (!panel->backlight.present)
 751                 return;
 752
 753         /*
 754          * Do not disable backlight on the vgaswitcheroo path. When switching
 755          * away from i915, the other client may depend on i915 to handle the
 756          * backlight. This will leave the backlight on unnecessarily when
 757          * another client is not activated.
 758          */
 759         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 760                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 761                 return;
 762         }
 763
 764         mutex_lock(&dev_priv->backlight_lock);
 765
 766         if (panel->backlight.device)
 767                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 768         panel->backlight.enabled = false;
 769         dev_priv->display.disable_backlight(connector);
 770
 771         mutex_unlock(&dev_priv->backlight_lock);
 772 }
 773
 774 static void bdw_enable_backlight(struct intel_connector *connector)
 775 {
 776         struct drm_device *dev = connector->base.dev;
 777         struct drm_i915_private *dev_priv = dev->dev_private;
 778         struct intel_panel *panel = &connector->panel;
 779         u32 pch_ctl1, pch_ctl2;
 780
 781         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 782         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 783                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 784                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 785                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 786         }
 787
 788         pch_ctl2 = panel->backlight.max << 16;
 789         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 790
 791         pch_ctl1 = 0;
 792         if (panel->backlight.active_low_pwm)
 793                 pch_ctl1 |= BLM_PCH_POLARITY;
 794
 795         /* After LPT, override is the default. */
 796         if (HAS_PCH_LPT(dev_priv))
 797                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 798
 799         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 800         POSTING_READ(BLC_PWM_PCH_CTL1);
 801         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 802
 803         /* This won't stick until the above enable. */
 804         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 805 }
 806
 807 static void pch_enable_backlight(struct intel_connector *connector)
 808 {
 809         struct drm_device *dev = connector->base.dev;
 810         struct drm_i915_private *dev_priv = dev->dev_private;
 811         struct intel_panel *panel = &connector->panel;
 812         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 813         enum transcoder cpu_transcoder =
 814                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 815         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 816
 817         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 818         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 819                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 820                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 821                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 822         }
 823
 824         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 825         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 826                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 827                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 828                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 829         }
 830
 831         if (cpu_transcoder == TRANSCODER_EDP)
 832                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 833         else
 834                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 835         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 836         POSTING_READ(BLC_PWM_CPU_CTL2);
 837         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 838
 839         /* This won't stick until the above enable. */
 840         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 841
 842         pch_ctl2 = panel->backlight.max << 16;
 843         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 844
 845         pch_ctl1 = 0;
 846         if (panel->backlight.active_low_pwm)
 847                 pch_ctl1 |= BLM_PCH_POLARITY;
 848
 849         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 850         POSTING_READ(BLC_PWM_PCH_CTL1);
 851         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 852 }
 853
 854 static void i9xx_enable_backlight(struct intel_connector *connector)
 855 {
 856         struct drm_device *dev = connector->base.dev;
 857         struct drm_i915_private *dev_priv = dev->dev_private;
 858         struct intel_panel *panel = &connector->panel;
 859         u32 ctl, freq;
 860
 861         ctl = I915_READ(BLC_PWM_CTL);
 862         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 863                 DRM_DEBUG_KMS("backlight already enabled\n");
 864                 I915_WRITE(BLC_PWM_CTL, 0);
 865         }
 866
 867         freq = panel->backlight.max;
 868         if (panel->backlight.combination_mode)
 869                 freq /= 0xff;
 870
 871         ctl = freq << 17;
 872         if (panel->backlight.combination_mode)
 873                 ctl |= BLM_LEGACY_MODE;
 874         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 875                 ctl |= BLM_POLARITY_PNV;
 876
 877         I915_WRITE(BLC_PWM_CTL, ctl);
 878         POSTING_READ(BLC_PWM_CTL);
 879
 880         /* XXX: combine this into above write? */
 881         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 882 }
 883
 884 static void i965_enable_backlight(struct intel_connector *connector)
 885 {
 886         struct drm_device *dev = connector->base.dev;
 887         struct drm_i915_private *dev_priv = dev->dev_private;
 888         struct intel_panel *panel = &connector->panel;
 889         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 890         u32 ctl, ctl2, freq;
 891
 892         ctl2 = I915_READ(BLC_PWM_CTL2);
 893         if (ctl2 & BLM_PWM_ENABLE) {
 894                 DRM_DEBUG_KMS("backlight already enabled\n");
 895                 ctl2 &= ~BLM_PWM_ENABLE;
 896                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 897         }
 898
 899         freq = panel->backlight.max;
 900         if (panel->backlight.combination_mode)
 901                 freq /= 0xff;
 902
 903         ctl = freq << 16;
 904         I915_WRITE(BLC_PWM_CTL, ctl);
 905
 906         ctl2 = BLM_PIPE(pipe);
 907         if (panel->backlight.combination_mode)
 908                 ctl2 |= BLM_COMBINATION_MODE;
 909         if (panel->backlight.active_low_pwm)
 910                 ctl2 |= BLM_POLARITY_I965;
 911         I915_WRITE(BLC_PWM_CTL2, ctl2);
 912         POSTING_READ(BLC_PWM_CTL2);
 913         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 914
 915         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 916 }
 917
 918 static void vlv_enable_backlight(struct intel_connector *connector)
 919 {
 920         struct drm_device *dev = connector->base.dev;
 921         struct drm_i915_private *dev_priv = dev->dev_private;
 922         struct intel_panel *panel = &connector->panel;
 923         enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
 924         u32 ctl, ctl2;
 925
 926         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 927                 return;
 928
 929         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 930         if (ctl2 & BLM_PWM_ENABLE) {
 931                 DRM_DEBUG_KMS("backlight already enabled\n");
 932                 ctl2 &= ~BLM_PWM_ENABLE;
 933                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 934         }
 935
 936         ctl = panel->backlight.max << 16;
 937         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 938
 939         /* XXX: combine this into above write? */
 940         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 941
 942         ctl2 = 0;
 943         if (panel->backlight.active_low_pwm)
 944                 ctl2 |= BLM_POLARITY_I965;
 945         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
 946         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 947         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 948 }
 949
 950 void intel_panel_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
 957         if (!panel->backlight.present)
 958                 return;
 959
 960         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 961
 962         mutex_lock(&dev_priv->backlight_lock);
 963
 964         WARN_ON(panel->backlight.max == 0);
 965
 966         if (panel->backlight.level <= panel->backlight.min) {
 967                 panel->backlight.level = panel->backlight.max;
 968                 if (panel->backlight.device)
 969                         panel->backlight.device->props.brightness =
 970                                 scale_hw_to_user(connector,
 971                                                  panel->backlight.level,
 972                                                  panel->backlight.device->props.max_brightness);
 973         }
 974
 975         dev_priv->display.enable_backlight(connector);
 976         panel->backlight.enabled = true;
 977         if (panel->backlight.device)
 978                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
 979
 980         mutex_unlock(&dev_priv->backlight_lock);
 981 }
 982
 983 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 984 static int intel_backlight_device_update_status(struct backlight_device *bd)
 985 {
 986 #if 0
 987         struct intel_connector *connector = bl_get_data(bd);
 988         struct intel_panel *panel = &connector->panel;
 989         struct drm_device *dev = connector->base.dev;
 990
 991         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 992         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 993                       bd->props.brightness, bd->props.max_brightness);
 994         intel_panel_set_backlight(connector, bd->props.brightness,
 995                                   bd->props.max_brightness);
 996
 997         /*
 998          * Allow flipping bl_power as a sub-state of enabled. Sadly the
 999          * backlight class device does not make it easy to to differentiate
1000          * between callbacks for brightness and bl_power, so our backlight_power
1001          * callback needs to take this into account.
1002          */
1003         if (panel->backlight.enabled) {
1004                 if (panel->backlight_power) {
1005                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1006                                 bd->props.brightness != 0;
1007                         panel->backlight_power(connector, enable);
1008                 }
1009         } else {
1010                 bd->props.power = FB_BLANK_POWERDOWN;
1011         }
1012
1013         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1014 #endif
1015         return 0;
1016 }
1017
1018 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1019 {
1020 #if 0
1021         struct intel_connector *connector = bl_get_data(bd);
1022         struct drm_device *dev = connector->base.dev;
1023         struct drm_i915_private *dev_priv = dev->dev_private;
1024         u32 hw_level;
1025         int ret;
1026
1027         intel_runtime_pm_get(dev_priv);
1028         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1029
1030         hw_level = intel_panel_get_backlight(connector);
1031         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1032
1033         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1034         intel_runtime_pm_put(dev_priv);
1035
1036         return ret;
1037 #endif
1038         return 0;
1039 }
1040
1041 static const struct backlight_ops intel_backlight_device_ops = {
1042         .update_status = intel_backlight_device_update_status,
1043         .get_brightness = intel_backlight_device_get_brightness,
1044 };
1045
1046 static int intel_backlight_device_register(struct intel_connector *connector)
1047 {
1048         struct intel_panel *panel = &connector->panel;
1049         struct backlight_properties props;
1050
1051         if (WARN_ON(panel->backlight.device))
1052                 return -ENODEV;
1053
1054         if (!panel->backlight.present)
1055                 return 0;
1056
1057         WARN_ON(panel->backlight.max == 0);
1058
1059         memset(&props, 0, sizeof(props));
1060         props.type = BACKLIGHT_RAW;
1061
1062         /*
1063          * Note: Everything should work even if the backlight device max
1064          * presented to the userspace is arbitrarily chosen.
1065          */
1066         props.max_brightness = panel->backlight.max;
1067         props.brightness = scale_hw_to_user(connector,
1068                                             panel->backlight.level,
1069                                             props.max_brightness);
1070
1071         if (panel->backlight.enabled)
1072                 props.power = FB_BLANK_UNBLANK;
1073         else
1074                 props.power = FB_BLANK_POWERDOWN;
1075
1076         /*
1077          * Note: using the same name independent of the connector prevents
1078          * registration of multiple backlight devices in the driver.
1079          */
1080 #if 0
1081         panel->backlight.device =
1082                 backlight_device_register("intel_backlight",
1083                                           connector->base.kdev,
1084                                           connector,
1085                                           &intel_backlight_device_ops, &props);
1086
1087         if (IS_ERR(panel->backlight.device)) {
1088                 DRM_ERROR("Failed to register backlight: %ld\n",
1089                           PTR_ERR(panel->backlight.device));
1090                 panel->backlight.device = NULL;
1091                 return -ENODEV;
1092         }
1093 #endif
1094
1095         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1096                       connector->base.name);
1097
1098         return 0;
1099 }
1100
1101 static void intel_backlight_device_unregister(struct intel_connector *connector)
1102 {
1103 #if 0
1104         struct intel_panel *panel = &connector->panel;
1105
1106         if (panel->backlight.device) {
1107                 backlight_device_unregister(panel->backlight.device);
1108                 panel->backlight.device = NULL;
1109         }
1110 #endif
1111 }
1112 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1113 static int intel_backlight_device_register(struct intel_connector *connector)
1114 {
1115         return 0;
1116 }
1117 static void intel_backlight_device_unregister(struct intel_connector *connector)
1118 {
1119 }
1120 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1121
1122 /*
1123  * Note: The setup hooks can't assume pipe is set!
1124  *
1125  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1126  * appropriately when it's 0. Use VBT and/or sane defaults.
1127  */
1128 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1129 {
1130         struct drm_device *dev = connector->base.dev;
1131         struct drm_i915_private *dev_priv = dev->dev_private;
1132         struct intel_panel *panel = &connector->panel;
1133         int min;
1134
1135         WARN_ON(panel->backlight.max == 0);
1136
1137         /*
1138          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1139          * to problems. There are such machines out there. Either our
1140          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1141          * against this by letting the minimum be at most (arbitrarily chosen)
1142          * 25% of the max.
1143          */
1144         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1145         if (min != dev_priv->vbt.backlight.min_brightness) {
1146                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1147                               dev_priv->vbt.backlight.min_brightness, min);
1148         }
1149
1150         /* vbt value is a coefficient in range [0..255] */
1151         return scale(min, 0, 255, 0, panel->backlight.max);
1152 }
1153
1154 static int bdw_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1155 {
1156         struct drm_device *dev = connector->base.dev;
1157         struct drm_i915_private *dev_priv = dev->dev_private;
1158         struct intel_panel *panel = &connector->panel;
1159         u32 pch_ctl1, pch_ctl2, val;
1160
1161         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1162         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1163
1164         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1165         panel->backlight.max = pch_ctl2 >> 16;
1166         if (!panel->backlight.max)
1167                 return -ENODEV;
1168
1169         panel->backlight.min = get_backlight_min_vbt(connector);
1170
1171         val = bdw_get_backlight(connector);
1172         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1173
1174         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1175                 panel->backlight.level != 0;
1176
1177         return 0;
1178 }
1179
1180 static int pch_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1181 {
1182         struct drm_device *dev = connector->base.dev;
1183         struct drm_i915_private *dev_priv = dev->dev_private;
1184         struct intel_panel *panel = &connector->panel;
1185         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1186
1187         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1188         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1189
1190         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1191         panel->backlight.max = pch_ctl2 >> 16;
1192         if (!panel->backlight.max)
1193                 return -ENODEV;
1194
1195         panel->backlight.min = get_backlight_min_vbt(connector);
1196
1197         val = pch_get_backlight(connector);
1198         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1199
1200         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1201         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1202                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1203
1204         return 0;
1205 }
1206
1207 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1208 {
1209         struct drm_device *dev = connector->base.dev;
1210         struct drm_i915_private *dev_priv = dev->dev_private;
1211         struct intel_panel *panel = &connector->panel;
1212         u32 ctl, val;
1213
1214         ctl = I915_READ(BLC_PWM_CTL);
1215
1216         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1217                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1218
1219         if (IS_PINEVIEW(dev))
1220                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1221
1222         panel->backlight.max = ctl >> 17;
1223         if (panel->backlight.combination_mode)
1224                 panel->backlight.max *= 0xff;
1225
1226         if (!panel->backlight.max)
1227                 return -ENODEV;
1228
1229         panel->backlight.min = get_backlight_min_vbt(connector);
1230
1231         val = i9xx_get_backlight(connector);
1232         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1233
1234         panel->backlight.enabled = panel->backlight.level != 0;
1235
1236         return 0;
1237 }
1238
1239 static int i965_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1240 {
1241         struct drm_device *dev = connector->base.dev;
1242         struct drm_i915_private *dev_priv = dev->dev_private;
1243         struct intel_panel *panel = &connector->panel;
1244         u32 ctl, ctl2, val;
1245
1246         ctl2 = I915_READ(BLC_PWM_CTL2);
1247         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1248         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1249
1250         ctl = I915_READ(BLC_PWM_CTL);
1251         panel->backlight.max = ctl >> 16;
1252         if (panel->backlight.combination_mode)
1253                 panel->backlight.max *= 0xff;
1254
1255         if (!panel->backlight.max)
1256                 return -ENODEV;
1257
1258         panel->backlight.min = get_backlight_min_vbt(connector);
1259
1260         val = i9xx_get_backlight(connector);
1261         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1262
1263         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1264                 panel->backlight.level != 0;
1265
1266         return 0;
1267 }
1268
1269 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_pipe pipe)
1270 {
1271         struct drm_device *dev = connector->base.dev;
1272         struct drm_i915_private *dev_priv = dev->dev_private;
1273         struct intel_panel *panel = &connector->panel;
1274         enum i915_pipe p;
1275         u32 ctl, ctl2, val;
1276
1277         for_each_pipe(dev_priv, p) {
1278                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1279
1280                 /* Skip if the modulation freq is already set */
1281                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1282                         continue;
1283
1284                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1285                 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1286                            cur_val);
1287         }
1288
1289         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1290                 return -ENODEV;
1291
1292         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1293         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1294
1295         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1296         panel->backlight.max = ctl >> 16;
1297         if (!panel->backlight.max)
1298                 return -ENODEV;
1299
1300         panel->backlight.min = get_backlight_min_vbt(connector);
1301
1302         val = _vlv_get_backlight(dev, pipe);
1303         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1304
1305         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1306                 panel->backlight.level != 0;
1307
1308         return 0;
1309 }
1310
1311 #ifdef __DragonFly__
1312 /*
1313  * Read max backlight level
1314  */
1315 static int
1316 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1317 {
1318         int err, val;
1319         struct intel_connector *connector = arg1;
1320         struct drm_device *dev = connector->base.dev;
1321         struct drm_i915_private *dev_priv = dev->dev_private;
1322         struct intel_panel *panel = &connector->panel;
1323
1324         mutex_lock(&dev_priv->backlight_lock);
1325         val = panel->backlight.max;
1326         mutex_unlock(&dev_priv->backlight_lock);
1327
1328         err = sysctl_handle_int(oidp, &val, 0, req);
1329         return(err);
1330 }
1331
1332 /*
1333  * Read/write backlight level
1334  */
1335 static int
1336 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1337 {
1338         struct intel_connector *connector = arg1;
1339         struct drm_device *dev = connector->base.dev;
1340         struct drm_i915_private *dev_priv = dev->dev_private;
1341         struct intel_panel *panel = &connector->panel;
1342         int err, val;
1343         u32 user_level, max_brightness;
1344
1345         mutex_lock(&dev_priv->backlight_lock);
1346         max_brightness = panel->backlight.max;
1347         user_level = scale_hw_to_user(connector, panel->backlight.level,
1348             max_brightness);
1349         mutex_unlock(&dev_priv->backlight_lock);
1350
1351         val = user_level;
1352         err = sysctl_handle_int(oidp, &val, 0, req);
1353         if (err != 0 || req->newptr == NULL) {
1354                 return(err);
1355         }
1356
1357         if (val != user_level && val >= 0 && val <= max_brightness) {
1358                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1359                 intel_panel_set_backlight(arg1, val, max_brightness);
1360                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1361         }
1362
1363         return(err);
1364 }
1365 #endif /* __DragonFly__ */
1366
1367 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe)
1368 {
1369         struct drm_device *dev = connector->dev;
1370         struct drm_i915_private *dev_priv = dev->dev_private;
1371         struct intel_connector *intel_connector = to_intel_connector(connector);
1372         struct intel_panel *panel = &intel_connector->panel;
1373         int ret;
1374
1375         if (!dev_priv->vbt.backlight.present) {
1376                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1377                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1378                 } else {
1379                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1380                         return 0;
1381                 }
1382         }
1383
1384         /* set level and max in panel struct */
1385         mutex_lock(&dev_priv->backlight_lock);
1386         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1387         mutex_unlock(&dev_priv->backlight_lock);
1388
1389         if (ret) {
1390                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1391                               connector->name);
1392                 return ret;
1393         }
1394
1395         panel->backlight.present = true;
1396
1397 #ifdef __DragonFly__
1398         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1399                         OID_AUTO, "backlight_max",
1400                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1401                         connector, sizeof(int),
1402                         sysctl_backlight_max,
1403                         "I", "Max backlight level");
1404         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1405                         OID_AUTO, "backlight_level",
1406                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1407                         connector, sizeof(int),
1408                         sysctl_backlight_handler,
1409                         "I", "Backlight level");
1410 #endif
1411
1412         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1413                       connector->name,
1414                       panel->backlight.enabled ? "enabled" : "disabled",
1415                       panel->backlight.level, panel->backlight.max);
1416
1417         return 0;
1418 }
1419
1420 void intel_panel_destroy_backlight(struct drm_connector *connector)
1421 {
1422         struct intel_connector *intel_connector = to_intel_connector(connector);
1423         struct intel_panel *panel = &intel_connector->panel;
1424
1425         panel->backlight.present = false;
1426 }
1427
1428 /* Set up chip specific backlight functions */
1429 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1430 {
1431         struct drm_i915_private *dev_priv = dev->dev_private;
1432
1433         if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) {
1434                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1435                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1436                 dev_priv->display.disable_backlight = pch_disable_backlight;
1437                 dev_priv->display.set_backlight = bdw_set_backlight;
1438                 dev_priv->display.get_backlight = bdw_get_backlight;
1439         } else if (HAS_PCH_SPLIT(dev)) {
1440                 dev_priv->display.setup_backlight = pch_setup_backlight;
1441                 dev_priv->display.enable_backlight = pch_enable_backlight;
1442                 dev_priv->display.disable_backlight = pch_disable_backlight;
1443                 dev_priv->display.set_backlight = pch_set_backlight;
1444                 dev_priv->display.get_backlight = pch_get_backlight;
1445         } else if (IS_VALLEYVIEW(dev)) {
1446                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1447                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1448                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1449                 dev_priv->display.set_backlight = vlv_set_backlight;
1450                 dev_priv->display.get_backlight = vlv_get_backlight;
1451         } else if (IS_GEN4(dev)) {
1452                 dev_priv->display.setup_backlight = i965_setup_backlight;
1453                 dev_priv->display.enable_backlight = i965_enable_backlight;
1454                 dev_priv->display.disable_backlight = i965_disable_backlight;
1455                 dev_priv->display.set_backlight = i9xx_set_backlight;
1456                 dev_priv->display.get_backlight = i9xx_get_backlight;
1457         } else {
1458                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1459                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1460                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1461                 dev_priv->display.set_backlight = i9xx_set_backlight;
1462                 dev_priv->display.get_backlight = i9xx_get_backlight;
1463         }
1464 }
1465
1466 int intel_panel_init(struct intel_panel *panel,
1467                      struct drm_display_mode *fixed_mode,
1468                      struct drm_display_mode *downclock_mode)
1469 {
1470         panel->fixed_mode = fixed_mode;
1471         panel->downclock_mode = downclock_mode;
1472
1473         return 0;
1474 }
1475
1476 void intel_panel_fini(struct intel_panel *panel)
1477 {
1478         struct intel_connector *intel_connector =
1479                 container_of(panel, struct intel_connector, panel);
1480
1481         if (panel->fixed_mode)
1482                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1483
1484         if (panel->downclock_mode)
1485                 drm_mode_destroy(intel_connector->base.dev,
1486                                 panel->downclock_mode);
1487 }
1488
1489 void intel_backlight_register(struct drm_device *dev)
1490 {
1491         struct intel_connector *connector;
1492
1493         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1494                 intel_backlight_device_register(connector);
1495 }
1496
1497 void intel_backlight_unregister(struct drm_device *dev)
1498 {
1499         struct intel_connector *connector;
1500
1501         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1502                 intel_backlight_device_unregister(connector);
1503 }