drivers/gpu/drm/i915/intel_panel.c

   1 /*
   2  * Copyright © 2006-2010 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  *      Chris Wilson <chris@chris-wilson.co.uk>
  29  */
  30
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32
  33 #include <linux/moduleparam.h>
  34 #include "intel_drv.h"
  35
  36 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  37
  38 void
  39 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  40                        struct drm_display_mode *adjusted_mode)
  41 {
  42         drm_mode_copy(adjusted_mode, fixed_mode);
  43
  44         drm_mode_set_crtcinfo(adjusted_mode, 0);
  45 }
  46
  47 /* adjusted_mode has been preset to be the panel's fixed mode */
  48 void
  49 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
  50                         struct intel_crtc_config *pipe_config,
  51                         int fitting_mode)
  52 {
  53         struct drm_display_mode *adjusted_mode;
  54         int x, y, width, height;
  55
  56         adjusted_mode = &pipe_config->adjusted_mode;
  57
  58         x = y = width = height = 0;
  59
  60         /* Native modes don't need fitting */
  61         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
  62             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
  63                 goto done;
  64
  65         switch (fitting_mode) {
  66         case DRM_MODE_SCALE_CENTER:
  67                 width = pipe_config->pipe_src_w;
  68                 height = pipe_config->pipe_src_h;
  69                 x = (adjusted_mode->hdisplay - width + 1)/2;
  70                 y = (adjusted_mode->vdisplay - height + 1)/2;
  71                 break;
  72
  73         case DRM_MODE_SCALE_ASPECT:
  74                 /* Scale but preserve the aspect ratio */
  75                 {
  76                         u32 scaled_width = adjusted_mode->hdisplay
  77                                 * pipe_config->pipe_src_h;
  78                         u32 scaled_height = pipe_config->pipe_src_w
  79                                 * adjusted_mode->vdisplay;
  80                         if (scaled_width > scaled_height) { /* pillar */
  81                                 width = scaled_height / pipe_config->pipe_src_h;
  82                                 if (width & 1)
  83                                         width++;
  84                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
  85                                 y = 0;
  86                                 height = adjusted_mode->vdisplay;
  87                         } else if (scaled_width < scaled_height) { /* letter */
  88                                 height = scaled_width / pipe_config->pipe_src_w;
  89                                 if (height & 1)
  90                                     height++;
  91                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
  92                                 x = 0;
  93                                 width = adjusted_mode->hdisplay;
  94                         } else {
  95                                 x = y = 0;
  96                                 width = adjusted_mode->hdisplay;
  97                                 height = adjusted_mode->vdisplay;
  98                         }
  99                 }
 100                 break;
 101
 102         case DRM_MODE_SCALE_FULLSCREEN:
 103                 x = y = 0;
 104                 width = adjusted_mode->hdisplay;
 105                 height = adjusted_mode->vdisplay;
 106                 break;
 107
 108         default:
 109                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 110                 return;
 111         }
 112
 113 done:
 114         pipe_config->pch_pfit.pos = (x << 16) | y;
 115         pipe_config->pch_pfit.size = (width << 16) | height;
 116         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 117 }
 118
 119 static void
 120 centre_horizontally(struct drm_display_mode *mode,
 121                     int width)
 122 {
 123         u32 border, sync_pos, blank_width, sync_width;
 124
 125         /* keep the hsync and hblank widths constant */
 126         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 127         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 128         sync_pos = (blank_width - sync_width + 1) / 2;
 129
 130         border = (mode->hdisplay - width + 1) / 2;
 131         border += border & 1; /* make the border even */
 132
 133         mode->crtc_hdisplay = width;
 134         mode->crtc_hblank_start = width + border;
 135         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 136
 137         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 138         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 139 }
 140
 141 static void
 142 centre_vertically(struct drm_display_mode *mode,
 143                   int height)
 144 {
 145         u32 border, sync_pos, blank_width, sync_width;
 146
 147         /* keep the vsync and vblank widths constant */
 148         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 149         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 150         sync_pos = (blank_width - sync_width + 1) / 2;
 151
 152         border = (mode->vdisplay - height + 1) / 2;
 153
 154         mode->crtc_vdisplay = height;
 155         mode->crtc_vblank_start = height + border;
 156         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 157
 158         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 159         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 160 }
 161
 162 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 163 {
 164         /*
 165          * Floating point operation is not supported. So the FACTOR
 166          * is defined, which can avoid the floating point computation
 167          * when calculating the panel ratio.
 168          */
 169 #define ACCURACY 12
 170 #define FACTOR (1 << ACCURACY)
 171         u32 ratio = source * FACTOR / target;
 172         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 173 }
 174
 175 static void i965_scale_aspect(struct intel_crtc_config *pipe_config,
 176                               u32 *pfit_control)
 177 {
 178         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 179         u32 scaled_width = adjusted_mode->hdisplay *
 180                 pipe_config->pipe_src_h;
 181         u32 scaled_height = pipe_config->pipe_src_w *
 182                 adjusted_mode->vdisplay;
 183
 184         /* 965+ is easy, it does everything in hw */
 185         if (scaled_width > scaled_height)
 186                 *pfit_control |= PFIT_ENABLE |
 187                         PFIT_SCALING_PILLAR;
 188         else if (scaled_width < scaled_height)
 189                 *pfit_control |= PFIT_ENABLE |
 190                         PFIT_SCALING_LETTER;
 191         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 192                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 193 }
 194
 195 static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config,
 196                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 197                               u32 *border)
 198 {
 199         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 200         u32 scaled_width = adjusted_mode->hdisplay *
 201                 pipe_config->pipe_src_h;
 202         u32 scaled_height = pipe_config->pipe_src_w *
 203                 adjusted_mode->vdisplay;
 204         u32 bits;
 205
 206         /*
 207          * For earlier chips we have to calculate the scaling
 208          * ratio by hand and program it into the
 209          * PFIT_PGM_RATIO register
 210          */
 211         if (scaled_width > scaled_height) { /* pillar */
 212                 centre_horizontally(adjusted_mode,
 213                                     scaled_height /
 214                                     pipe_config->pipe_src_h);
 215
 216                 *border = LVDS_BORDER_ENABLE;
 217                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 218                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 219                                                     adjusted_mode->vdisplay);
 220
 221                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 222                                              bits << PFIT_VERT_SCALE_SHIFT);
 223                         *pfit_control |= (PFIT_ENABLE |
 224                                           VERT_INTERP_BILINEAR |
 225                                           HORIZ_INTERP_BILINEAR);
 226                 }
 227         } else if (scaled_width < scaled_height) { /* letter */
 228                 centre_vertically(adjusted_mode,
 229                                   scaled_width /
 230                                   pipe_config->pipe_src_w);
 231
 232                 *border = LVDS_BORDER_ENABLE;
 233                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 234                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 235                                                     adjusted_mode->hdisplay);
 236
 237                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 238                                              bits << PFIT_VERT_SCALE_SHIFT);
 239                         *pfit_control |= (PFIT_ENABLE |
 240                                           VERT_INTERP_BILINEAR |
 241                                           HORIZ_INTERP_BILINEAR);
 242                 }
 243         } else {
 244                 /* Aspects match, Let hw scale both directions */
 245                 *pfit_control |= (PFIT_ENABLE |
 246                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 247                                   VERT_INTERP_BILINEAR |
 248                                   HORIZ_INTERP_BILINEAR);
 249         }
 250 }
 251
 252 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 253                               struct intel_crtc_config *pipe_config,
 254                               int fitting_mode)
 255 {
 256         struct drm_device *dev = intel_crtc->base.dev;
 257         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 258         struct drm_display_mode *adjusted_mode;
 259
 260         adjusted_mode = &pipe_config->adjusted_mode;
 261
 262         /* Native modes don't need fitting */
 263         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 264             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 265                 goto out;
 266
 267         switch (fitting_mode) {
 268         case DRM_MODE_SCALE_CENTER:
 269                 /*
 270                  * For centered modes, we have to calculate border widths &
 271                  * heights and modify the values programmed into the CRTC.
 272                  */
 273                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 274                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 275                 border = LVDS_BORDER_ENABLE;
 276                 break;
 277         case DRM_MODE_SCALE_ASPECT:
 278                 /* Scale but preserve the aspect ratio */
 279                 if (INTEL_INFO(dev)->gen >= 4)
 280                         i965_scale_aspect(pipe_config, &pfit_control);
 281                 else
 282                         i9xx_scale_aspect(pipe_config, &pfit_control,
 283                                           &pfit_pgm_ratios, &border);
 284                 break;
 285         case DRM_MODE_SCALE_FULLSCREEN:
 286                 /*
 287                  * Full scaling, even if it changes the aspect ratio.
 288                  * Fortunately this is all done for us in hw.
 289                  */
 290                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 291                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 292                         pfit_control |= PFIT_ENABLE;
 293                         if (INTEL_INFO(dev)->gen >= 4)
 294                                 pfit_control |= PFIT_SCALING_AUTO;
 295                         else
 296                                 pfit_control |= (VERT_AUTO_SCALE |
 297                                                  VERT_INTERP_BILINEAR |
 298                                                  HORIZ_AUTO_SCALE |
 299                                                  HORIZ_INTERP_BILINEAR);
 300                 }
 301                 break;
 302         default:
 303                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 304                 return;
 305         }
 306
 307         /* 965+ wants fuzzy fitting */
 308         /* FIXME: handle multiple panels by failing gracefully */
 309         if (INTEL_INFO(dev)->gen >= 4)
 310                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 311                                  PFIT_FILTER_FUZZY);
 312
 313 out:
 314         if ((pfit_control & PFIT_ENABLE) == 0) {
 315                 pfit_control = 0;
 316                 pfit_pgm_ratios = 0;
 317         }
 318
 319         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 320         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 321                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 322
 323         pipe_config->gmch_pfit.control = pfit_control;
 324         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 325         pipe_config->gmch_pfit.lvds_border_bits = border;
 326 }
 327
 328 static int is_backlight_combination_mode(struct drm_device *dev)
 329 {
 330         struct drm_i915_private *dev_priv = dev->dev_private;
 331
 332         if (INTEL_INFO(dev)->gen >= 4)
 333                 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
 334
 335         if (IS_GEN2(dev))
 336                 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
 337
 338         return 0;
 339 }
 340
 341 /* XXX: query mode clock or hardware clock and program max PWM appropriately
 342  * when it's 0.
 343  */
 344 static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
 345 {
 346         struct drm_i915_private *dev_priv = dev->dev_private;
 347         u32 val;
 348
 349         WARN_ON_SMP(!spin_is_locked(&dev_priv->backlight.lock));
 350
 351         /* Restore the CTL value if it lost, e.g. GPU reset */
 352
 353         if (HAS_PCH_SPLIT(dev_priv->dev)) {
 354                 val = I915_READ(BLC_PWM_PCH_CTL2);
 355                 if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
 356                         dev_priv->regfile.saveBLC_PWM_CTL2 = val;
 357                 } else if (val == 0) {
 358                         val = dev_priv->regfile.saveBLC_PWM_CTL2;
 359                         I915_WRITE(BLC_PWM_PCH_CTL2, val);
 360                 }
 361         } else {
 362                 val = I915_READ(BLC_PWM_CTL);
 363                 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 364                         dev_priv->regfile.saveBLC_PWM_CTL = val;
 365                         if (INTEL_INFO(dev)->gen >= 4)
 366                                 dev_priv->regfile.saveBLC_PWM_CTL2 =
 367                                         I915_READ(BLC_PWM_CTL2);
 368                 } else if (val == 0) {
 369                         val = dev_priv->regfile.saveBLC_PWM_CTL;
 370                         I915_WRITE(BLC_PWM_CTL, val);
 371                         if (INTEL_INFO(dev)->gen >= 4)
 372                                 I915_WRITE(BLC_PWM_CTL2,
 373                                            dev_priv->regfile.saveBLC_PWM_CTL2);
 374                 }
 375         }
 376
 377         return val;
 378 }
 379
 380 static u32 intel_panel_get_max_backlight(struct drm_device *dev)
 381 {
 382         u32 max;
 383
 384         max = i915_read_blc_pwm_ctl(dev);
 385
 386         if (HAS_PCH_SPLIT(dev)) {
 387                 max >>= 16;
 388         } else {
 389                 if (INTEL_INFO(dev)->gen < 4)
 390                         max >>= 17;
 391                 else
 392                         max >>= 16;
 393
 394                 if (is_backlight_combination_mode(dev))
 395                         max *= 0xff;
 396         }
 397
 398         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 399
 400         return max;
 401 }
 402
 403 static int i915_panel_invert_brightness;
 404 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 405         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 406         "report PCI device ID, subsystem vendor and subsystem device ID "
 407         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 408         "It will then be included in an upcoming module version.");
 409 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 410 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 411 {
 412         struct drm_i915_private *dev_priv = dev->dev_private;
 413
 414         if (i915_panel_invert_brightness < 0)
 415                 return val;
 416
 417         if (i915_panel_invert_brightness > 0 ||
 418             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 419                 u32 max = intel_panel_get_max_backlight(dev);
 420                 if (max)
 421                         return max - val;
 422         }
 423
 424         return val;
 425 }
 426
 427 static u32 intel_panel_get_backlight(struct drm_device *dev)
 428 {
 429         struct drm_i915_private *dev_priv = dev->dev_private;
 430         u32 val;
 431         unsigned long flags;
 432
 433         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 434
 435         if (HAS_PCH_SPLIT(dev)) {
 436                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 437         } else {
 438                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 439                 if (INTEL_INFO(dev)->gen < 4)
 440                         val >>= 1;
 441
 442                 if (is_backlight_combination_mode(dev)) {
 443                         u8 lbpc;
 444
 445                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 446                         val *= lbpc;
 447                 }
 448         }
 449
 450         val = intel_panel_compute_brightness(dev, val);
 451
 452         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 453
 454         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 455         return val;
 456 }
 457
 458 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 459 {
 460         struct drm_i915_private *dev_priv = dev->dev_private;
 461         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 462         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 463 }
 464
 465 static void intel_panel_actually_set_backlight(struct drm_device *dev,
 466                                                u32 level)
 467 {
 468         struct drm_i915_private *dev_priv = dev->dev_private;
 469         u32 tmp;
 470
 471         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 472         level = intel_panel_compute_brightness(dev, level);
 473
 474         if (HAS_PCH_SPLIT(dev))
 475                 return intel_pch_panel_set_backlight(dev, level);
 476
 477         if (is_backlight_combination_mode(dev)) {
 478                 u32 max = intel_panel_get_max_backlight(dev);
 479                 u8 lbpc;
 480
 481                 /* we're screwed, but keep behaviour backwards compatible */
 482                 if (!max)
 483                         max = 1;
 484
 485                 lbpc = level * 0xfe / max + 1;
 486                 level /= lbpc;
 487                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 488         }
 489
 490         tmp = I915_READ(BLC_PWM_CTL);
 491         if (INTEL_INFO(dev)->gen < 4)
 492                 level <<= 1;
 493         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 494         I915_WRITE(BLC_PWM_CTL, tmp | level);
 495 }
 496
 497 /* set backlight brightness to level in range [0..max] */
 498 void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max)
 499 {
 500         struct drm_i915_private *dev_priv = dev->dev_private;
 501         u32 freq;
 502         unsigned long flags;
 503
 504         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 505
 506         freq = intel_panel_get_max_backlight(dev);
 507         if (!freq) {
 508                 /* we are screwed, bail out */
 509                 goto out;
 510         }
 511
 512         /* scale to hardware, but be careful to not overflow */
 513         if (freq < max)
 514                 level = level * freq / max;
 515         else
 516                 level = freq / max * level;
 517
 518         dev_priv->backlight.level = level;
 519         if (dev_priv->backlight.device)
 520                 dev_priv->backlight.device->props.brightness = level;
 521
 522         if (dev_priv->backlight.enabled)
 523                 intel_panel_actually_set_backlight(dev, level);
 524 out:
 525         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 526 }
 527
 528 void intel_panel_disable_backlight(struct drm_device *dev)
 529 {
 530         struct drm_i915_private *dev_priv = dev->dev_private;
 531         unsigned long flags;
 532
 533         /*
 534          * Do not disable backlight on the vgaswitcheroo path. When switching
 535          * away from i915, the other client may depend on i915 to handle the
 536          * backlight. This will leave the backlight on unnecessarily when
 537          * another client is not activated.
 538          */
 539         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 540                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 541                 return;
 542         }
 543
 544         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 545
 546         dev_priv->backlight.enabled = false;
 547         intel_panel_actually_set_backlight(dev, 0);
 548
 549         if (INTEL_INFO(dev)->gen >= 4) {
 550                 uint32_t reg, tmp;
 551
 552                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 553
 554                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 555
 556                 if (HAS_PCH_SPLIT(dev)) {
 557                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 558                         tmp &= ~BLM_PCH_PWM_ENABLE;
 559                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 560                 }
 561         }
 562
 563         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 564 }
 565
 566 void intel_panel_enable_backlight(struct drm_device *dev,
 567                                   enum pipe pipe)
 568 {
 569         struct drm_i915_private *dev_priv = dev->dev_private;
 570         enum transcoder cpu_transcoder =
 571                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 572         unsigned long flags;
 573
 574         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 575
 576         if (dev_priv->backlight.level == 0) {
 577                 dev_priv->backlight.level = intel_panel_get_max_backlight(dev);
 578                 if (dev_priv->backlight.device)
 579                         dev_priv->backlight.device->props.brightness =
 580                                 dev_priv->backlight.level;
 581         }
 582
 583         if (INTEL_INFO(dev)->gen >= 4) {
 584                 uint32_t reg, tmp;
 585
 586                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 587
 588
 589                 tmp = I915_READ(reg);
 590
 591                 /* Note that this can also get called through dpms changes. And
 592                  * we don't track the backlight dpms state, hence check whether
 593                  * we have to do anything first. */
 594                 if (tmp & BLM_PWM_ENABLE)
 595                         goto set_level;
 596
 597                 if (INTEL_INFO(dev)->num_pipes == 3)
 598                         tmp &= ~BLM_PIPE_SELECT_IVB;
 599                 else
 600                         tmp &= ~BLM_PIPE_SELECT;
 601
 602                 if (cpu_transcoder == TRANSCODER_EDP)
 603                         tmp |= BLM_TRANSCODER_EDP;
 604                 else
 605                         tmp |= BLM_PIPE(cpu_transcoder);
 606                 tmp &= ~BLM_PWM_ENABLE;
 607
 608                 I915_WRITE(reg, tmp);
 609                 POSTING_READ(reg);
 610                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
 611
 612                 if (HAS_PCH_SPLIT(dev) &&
 613                     !(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {
 614                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 615                         tmp |= BLM_PCH_PWM_ENABLE;
 616                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 617                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 618                 }
 619         }
 620
 621 set_level:
 622         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 623          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 624          * registers are set.
 625          */
 626         dev_priv->backlight.enabled = true;
 627         intel_panel_actually_set_backlight(dev, dev_priv->backlight.level);
 628
 629         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 630 }
 631
 632 static void intel_panel_init_backlight(struct drm_device *dev)
 633 {
 634         struct drm_i915_private *dev_priv = dev->dev_private;
 635
 636         dev_priv->backlight.level = intel_panel_get_backlight(dev);
 637         dev_priv->backlight.enabled = dev_priv->backlight.level != 0;
 638 }
 639
 640 enum drm_connector_status
 641 intel_panel_detect(struct drm_device *dev)
 642 {
 643         struct drm_i915_private *dev_priv = dev->dev_private;
 644
 645         /* Assume that the BIOS does not lie through the OpRegion... */
 646         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
 647                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 648                         connector_status_connected :
 649                         connector_status_disconnected;
 650         }
 651
 652         switch (i915_panel_ignore_lid) {
 653         case -2:
 654                 return connector_status_connected;
 655         case -1:
 656                 return connector_status_disconnected;
 657         default:
 658                 return connector_status_unknown;
 659         }
 660 }
 661
 662 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 663 static int intel_panel_update_status(struct backlight_device *bd)
 664 {
 665         struct drm_device *dev = bl_get_data(bd);
 666         intel_panel_set_backlight(dev, bd->props.brightness,
 667                                   bd->props.max_brightness);
 668         return 0;
 669 }
 670
 671 static int intel_panel_get_brightness(struct backlight_device *bd)
 672 {
 673         struct drm_device *dev = bl_get_data(bd);
 674         return intel_panel_get_backlight(dev);
 675 }
 676
 677 static const struct backlight_ops intel_panel_bl_ops = {
 678         .update_status = intel_panel_update_status,
 679         .get_brightness = intel_panel_get_brightness,
 680 };
 681
 682 int intel_panel_setup_backlight(struct drm_connector *connector)
 683 {
 684         struct drm_device *dev = connector->dev;
 685         struct drm_i915_private *dev_priv = dev->dev_private;
 686         struct backlight_properties props;
 687         unsigned long flags;
 688
 689         intel_panel_init_backlight(dev);
 690
 691         if (WARN_ON(dev_priv->backlight.device))
 692                 return -ENODEV;
 693
 694         memset(&props, 0, sizeof(props));
 695         props.type = BACKLIGHT_RAW;
 696         props.brightness = dev_priv->backlight.level;
 697
 698         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 699         props.max_brightness = intel_panel_get_max_backlight(dev);
 700         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 701
 702         if (props.max_brightness == 0) {
 703                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
 704                 return -ENODEV;
 705         }
 706         dev_priv->backlight.device =
 707                 backlight_device_register("intel_backlight",
 708                                           &connector->kdev, dev,
 709                                           &intel_panel_bl_ops, &props);
 710
 711         if (IS_ERR(dev_priv->backlight.device)) {
 712                 DRM_ERROR("Failed to register backlight: %ld\n",
 713                           PTR_ERR(dev_priv->backlight.device));
 714                 dev_priv->backlight.device = NULL;
 715                 return -ENODEV;
 716         }
 717         return 0;
 718 }
 719
 720 void intel_panel_destroy_backlight(struct drm_device *dev)
 721 {
 722         struct drm_i915_private *dev_priv = dev->dev_private;
 723         if (dev_priv->backlight.device) {
 724                 backlight_device_unregister(dev_priv->backlight.device);
 725                 dev_priv->backlight.device = NULL;
 726         }
 727 }
 728 #else
 729 int intel_panel_setup_backlight(struct drm_connector *connector)
 730 {
 731         intel_panel_init_backlight(connector->dev);
 732         return 0;
 733 }
 734
 735 void intel_panel_destroy_backlight(struct drm_device *dev)
 736 {
 737         return;
 738 }
 739 #endif
 740
 741 int intel_panel_init(struct intel_panel *panel,
 742                      struct drm_display_mode *fixed_mode)
 743 {
 744         panel->fixed_mode = fixed_mode;
 745
 746         return 0;
 747 }
 748
 749 void intel_panel_fini(struct intel_panel *panel)
 750 {
 751         struct intel_connector *intel_connector =
 752                 container_of(panel, struct intel_connector, panel);
 753
 754         if (panel->fixed_mode)
 755                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 756 }