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 (IS_GEN4(dev))
 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, enum pipe pipe)
 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                 if (IS_VALLEYVIEW(dev) && !val)
 377                         val = 0x0f42ffff;
 378         }
 379
 380         return val;
 381 }
 382
 383 static u32 intel_panel_get_max_backlight(struct drm_device *dev,
 384                                          enum pipe pipe)
 385 {
 386         u32 max;
 387
 388         max = i915_read_blc_pwm_ctl(dev, pipe);
 389
 390         if (HAS_PCH_SPLIT(dev)) {
 391                 max >>= 16;
 392         } else {
 393                 if (INTEL_INFO(dev)->gen < 4)
 394                         max >>= 17;
 395                 else
 396                         max >>= 16;
 397
 398                 if (is_backlight_combination_mode(dev))
 399                         max *= 0xff;
 400         }
 401
 402         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 403
 404         return max;
 405 }
 406
 407 static int i915_panel_invert_brightness;
 408 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 409         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 410         "report PCI device ID, subsystem vendor and subsystem device ID "
 411         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 412         "It will then be included in an upcoming module version.");
 413 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 414 static u32 intel_panel_compute_brightness(struct drm_device *dev,
 415                                           enum pipe pipe, u32 val)
 416 {
 417         struct drm_i915_private *dev_priv = dev->dev_private;
 418
 419         if (i915_panel_invert_brightness < 0)
 420                 return val;
 421
 422         if (i915_panel_invert_brightness > 0 ||
 423             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 424                 u32 max = intel_panel_get_max_backlight(dev, pipe);
 425                 if (max)
 426                         return max - val;
 427         }
 428
 429         return val;
 430 }
 431
 432 static u32 intel_panel_get_backlight(struct drm_device *dev,
 433                                      enum pipe pipe)
 434 {
 435         struct drm_i915_private *dev_priv = dev->dev_private;
 436         u32 val;
 437         unsigned long flags;
 438
 439         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 440
 441         if (HAS_PCH_SPLIT(dev)) {
 442                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 443         } else {
 444                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 445                 if (INTEL_INFO(dev)->gen < 4)
 446                         val >>= 1;
 447
 448                 if (is_backlight_combination_mode(dev)) {
 449                         u8 lbpc;
 450
 451                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 452                         val *= lbpc;
 453                 }
 454         }
 455
 456         val = intel_panel_compute_brightness(dev, pipe, val);
 457
 458         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 459
 460         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 461         return val;
 462 }
 463
 464 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 465 {
 466         struct drm_i915_private *dev_priv = dev->dev_private;
 467         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 468         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 469 }
 470
 471 static void intel_panel_actually_set_backlight(struct drm_device *dev,
 472                                                enum pipe pipe, u32 level)
 473 {
 474         struct drm_i915_private *dev_priv = dev->dev_private;
 475         u32 tmp;
 476
 477         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 478         level = intel_panel_compute_brightness(dev, pipe, level);
 479
 480         if (HAS_PCH_SPLIT(dev))
 481                 return intel_pch_panel_set_backlight(dev, level);
 482
 483         if (is_backlight_combination_mode(dev)) {
 484                 u32 max = intel_panel_get_max_backlight(dev, pipe);
 485                 u8 lbpc;
 486
 487                 /* we're screwed, but keep behaviour backwards compatible */
 488                 if (!max)
 489                         max = 1;
 490
 491                 lbpc = level * 0xfe / max + 1;
 492                 level /= lbpc;
 493                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 494         }
 495
 496         tmp = I915_READ(BLC_PWM_CTL);
 497         if (INTEL_INFO(dev)->gen < 4)
 498                 level <<= 1;
 499         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 500         I915_WRITE(BLC_PWM_CTL, tmp | level);
 501 }
 502
 503 /* set backlight brightness to level in range [0..max] */
 504 void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
 505                                u32 max)
 506 {
 507         struct drm_device *dev = connector->base.dev;
 508         struct drm_i915_private *dev_priv = dev->dev_private;
 509         enum pipe pipe = intel_get_pipe_from_connector(connector);
 510         u32 freq;
 511         unsigned long flags;
 512
 513         if (pipe == INVALID_PIPE)
 514                 return;
 515
 516         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 517
 518         freq = intel_panel_get_max_backlight(dev, pipe);
 519         if (!freq) {
 520                 /* we are screwed, bail out */
 521                 goto out;
 522         }
 523
 524         /* scale to hardware, but be careful to not overflow */
 525         if (freq < max)
 526                 level = level * freq / max;
 527         else
 528                 level = freq / max * level;
 529
 530         dev_priv->backlight.level = level;
 531         if (dev_priv->backlight.device)
 532                 dev_priv->backlight.device->props.brightness = level;
 533
 534         if (dev_priv->backlight.enabled)
 535                 intel_panel_actually_set_backlight(dev, pipe, level);
 536 out:
 537         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 538 }
 539
 540 void intel_panel_disable_backlight(struct intel_connector *connector)
 541 {
 542         struct drm_device *dev = connector->base.dev;
 543         struct drm_i915_private *dev_priv = dev->dev_private;
 544         enum pipe pipe = intel_get_pipe_from_connector(connector);
 545         unsigned long flags;
 546
 547         if (pipe == INVALID_PIPE)
 548                 return;
 549
 550         /*
 551          * Do not disable backlight on the vgaswitcheroo path. When switching
 552          * away from i915, the other client may depend on i915 to handle the
 553          * backlight. This will leave the backlight on unnecessarily when
 554          * another client is not activated.
 555          */
 556         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 557                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 558                 return;
 559         }
 560
 561         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 562
 563         dev_priv->backlight.enabled = false;
 564         intel_panel_actually_set_backlight(dev, pipe, 0);
 565
 566         if (INTEL_INFO(dev)->gen >= 4) {
 567                 uint32_t reg, tmp;
 568
 569                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 570
 571                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 572
 573                 if (HAS_PCH_SPLIT(dev)) {
 574                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 575                         tmp &= ~BLM_PCH_PWM_ENABLE;
 576                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 577                 }
 578         }
 579
 580         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 581 }
 582
 583 void intel_panel_enable_backlight(struct intel_connector *connector)
 584 {
 585         struct drm_device *dev = connector->base.dev;
 586         struct drm_i915_private *dev_priv = dev->dev_private;
 587         enum pipe pipe = intel_get_pipe_from_connector(connector);
 588         enum transcoder cpu_transcoder =
 589                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 590         unsigned long flags;
 591
 592         if (pipe == INVALID_PIPE)
 593                 return;
 594
 595         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 596
 597         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 598
 599         if (dev_priv->backlight.level == 0) {
 600                 dev_priv->backlight.level = intel_panel_get_max_backlight(dev,
 601                                                                           pipe);
 602                 if (dev_priv->backlight.device)
 603                         dev_priv->backlight.device->props.brightness =
 604                                 dev_priv->backlight.level;
 605         }
 606
 607         if (INTEL_INFO(dev)->gen >= 4) {
 608                 uint32_t reg, tmp;
 609
 610                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 611
 612
 613                 tmp = I915_READ(reg);
 614
 615                 /* Note that this can also get called through dpms changes. And
 616                  * we don't track the backlight dpms state, hence check whether
 617                  * we have to do anything first. */
 618                 if (tmp & BLM_PWM_ENABLE)
 619                         goto set_level;
 620
 621                 if (INTEL_INFO(dev)->num_pipes == 3)
 622                         tmp &= ~BLM_PIPE_SELECT_IVB;
 623                 else
 624                         tmp &= ~BLM_PIPE_SELECT;
 625
 626                 if (cpu_transcoder == TRANSCODER_EDP)
 627                         tmp |= BLM_TRANSCODER_EDP;
 628                 else
 629                         tmp |= BLM_PIPE(cpu_transcoder);
 630                 tmp &= ~BLM_PWM_ENABLE;
 631
 632                 I915_WRITE(reg, tmp);
 633                 POSTING_READ(reg);
 634                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
 635
 636                 if (HAS_PCH_SPLIT(dev) &&
 637                     !(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {
 638                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 639                         tmp |= BLM_PCH_PWM_ENABLE;
 640                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 641                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 642                 }
 643         }
 644
 645 set_level:
 646         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 647          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 648          * registers are set.
 649          */
 650         dev_priv->backlight.enabled = true;
 651         intel_panel_actually_set_backlight(dev, pipe,
 652                                            dev_priv->backlight.level);
 653
 654         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 655 }
 656
 657 /* FIXME: use VBT vals to init PWM_CTL and PWM_CTL2 correctly */
 658 static void intel_panel_init_backlight_regs(struct drm_device *dev)
 659 {
 660         struct drm_i915_private *dev_priv = dev->dev_private;
 661
 662         if (IS_VALLEYVIEW(dev)) {
 663                 u32 cur_val = I915_READ(BLC_PWM_CTL) &
 664                         BACKLIGHT_DUTY_CYCLE_MASK;
 665                 I915_WRITE(BLC_PWM_CTL, (0xf42 << 16) | cur_val);
 666         }
 667 }
 668
 669 static void intel_panel_init_backlight(struct drm_device *dev)
 670 {
 671         struct drm_i915_private *dev_priv = dev->dev_private;
 672
 673         intel_panel_init_backlight_regs(dev);
 674
 675         dev_priv->backlight.level = intel_panel_get_backlight(dev, 0);
 676         dev_priv->backlight.enabled = dev_priv->backlight.level != 0;
 677 }
 678
 679 enum drm_connector_status
 680 intel_panel_detect(struct drm_device *dev)
 681 {
 682         struct drm_i915_private *dev_priv = dev->dev_private;
 683
 684         /* Assume that the BIOS does not lie through the OpRegion... */
 685         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
 686                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 687                         connector_status_connected :
 688                         connector_status_disconnected;
 689         }
 690
 691         switch (i915_panel_ignore_lid) {
 692         case -2:
 693                 return connector_status_connected;
 694         case -1:
 695                 return connector_status_disconnected;
 696         default:
 697                 return connector_status_unknown;
 698         }
 699 }
 700
 701 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 702 static int intel_panel_update_status(struct backlight_device *bd)
 703 {
 704         struct intel_connector *connector = bl_get_data(bd);
 705         struct drm_device *dev = connector->base.dev;
 706
 707         mutex_lock(&dev->mode_config.mutex);
 708         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 709                       bd->props.brightness, bd->props.max_brightness);
 710         intel_panel_set_backlight(connector, bd->props.brightness,
 711                                   bd->props.max_brightness);
 712         mutex_unlock(&dev->mode_config.mutex);
 713         return 0;
 714 }
 715
 716 static int intel_panel_get_brightness(struct backlight_device *bd)
 717 {
 718         struct intel_connector *connector = bl_get_data(bd);
 719         struct drm_device *dev = connector->base.dev;
 720         enum pipe pipe;
 721
 722         mutex_lock(&dev->mode_config.mutex);
 723         pipe = intel_get_pipe_from_connector(connector);
 724         mutex_unlock(&dev->mode_config.mutex);
 725         if (pipe == INVALID_PIPE)
 726                 return 0;
 727
 728         return intel_panel_get_backlight(connector->base.dev, pipe);
 729 }
 730
 731 static const struct backlight_ops intel_panel_bl_ops = {
 732         .update_status = intel_panel_update_status,
 733         .get_brightness = intel_panel_get_brightness,
 734 };
 735
 736 int intel_panel_setup_backlight(struct drm_connector *connector)
 737 {
 738         struct drm_device *dev = connector->dev;
 739         struct drm_i915_private *dev_priv = dev->dev_private;
 740         struct backlight_properties props;
 741         unsigned long flags;
 742
 743         intel_panel_init_backlight(dev);
 744
 745         if (WARN_ON(dev_priv->backlight.device))
 746                 return -ENODEV;
 747
 748         memset(&props, 0, sizeof(props));
 749         props.type = BACKLIGHT_RAW;
 750         props.brightness = dev_priv->backlight.level;
 751
 752         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 753         props.max_brightness = intel_panel_get_max_backlight(dev, 0);
 754         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 755
 756         if (props.max_brightness == 0) {
 757                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
 758                 return -ENODEV;
 759         }
 760         dev_priv->backlight.device =
 761                 backlight_device_register("intel_backlight",
 762                                           &connector->kdev,
 763                                           to_intel_connector(connector),
 764                                           &intel_panel_bl_ops, &props);
 765
 766         if (IS_ERR(dev_priv->backlight.device)) {
 767                 DRM_ERROR("Failed to register backlight: %ld\n",
 768                           PTR_ERR(dev_priv->backlight.device));
 769                 dev_priv->backlight.device = NULL;
 770                 return -ENODEV;
 771         }
 772         return 0;
 773 }
 774
 775 void intel_panel_destroy_backlight(struct drm_device *dev)
 776 {
 777         struct drm_i915_private *dev_priv = dev->dev_private;
 778         if (dev_priv->backlight.device) {
 779                 backlight_device_unregister(dev_priv->backlight.device);
 780                 dev_priv->backlight.device = NULL;
 781         }
 782 }
 783 #else
 784 int intel_panel_setup_backlight(struct drm_connector *connector)
 785 {
 786         intel_panel_init_backlight(connector->dev);
 787         return 0;
 788 }
 789
 790 void intel_panel_destroy_backlight(struct drm_device *dev)
 791 {
 792         return;
 793 }
 794 #endif
 795
 796 int intel_panel_init(struct intel_panel *panel,
 797                      struct drm_display_mode *fixed_mode)
 798 {
 799         panel->fixed_mode = fixed_mode;
 800
 801         return 0;
 802 }
 803
 804 void intel_panel_fini(struct intel_panel *panel)
 805 {
 806         struct intel_connector *intel_connector =
 807                 container_of(panel, struct intel_connector, panel);
 808
 809         if (panel->fixed_mode)
 810                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 811 }