Pileus Git - ~andy/linux/blob - 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 static u32 pch_get_max_backlight(struct intel_connector *connector)
 342 {
 343         struct drm_device *dev = connector->base.dev;
 344         struct drm_i915_private *dev_priv = dev->dev_private;
 345         u32 val;
 346
 347         val = I915_READ(BLC_PWM_PCH_CTL2);
 348         if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
 349                 dev_priv->regfile.saveBLC_PWM_CTL2 = val;
 350         } else if (val == 0) {
 351                 val = dev_priv->regfile.saveBLC_PWM_CTL2;
 352                 I915_WRITE(BLC_PWM_PCH_CTL2, val);
 353         }
 354
 355         val >>= 16;
 356
 357         return val;
 358 }
 359
 360 static u32 i9xx_get_max_backlight(struct intel_connector *connector)
 361 {
 362         struct drm_device *dev = connector->base.dev;
 363         struct drm_i915_private *dev_priv = dev->dev_private;
 364         u32 val;
 365
 366         val = I915_READ(BLC_PWM_CTL);
 367         if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 368                 dev_priv->regfile.saveBLC_PWM_CTL = val;
 369         } else if (val == 0) {
 370                 val = dev_priv->regfile.saveBLC_PWM_CTL;
 371                 I915_WRITE(BLC_PWM_CTL, val);
 372         }
 373
 374         val >>= 17;
 375
 376         if (is_backlight_combination_mode(dev))
 377                 val *= 0xff;
 378
 379         return val;
 380 }
 381
 382 static u32 i965_get_max_backlight(struct intel_connector *connector)
 383 {
 384         struct drm_device *dev = connector->base.dev;
 385         struct drm_i915_private *dev_priv = dev->dev_private;
 386         u32 val;
 387
 388         val = I915_READ(BLC_PWM_CTL);
 389         if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 390                 dev_priv->regfile.saveBLC_PWM_CTL = val;
 391                 dev_priv->regfile.saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 392         } else if (val == 0) {
 393                 val = dev_priv->regfile.saveBLC_PWM_CTL;
 394                 I915_WRITE(BLC_PWM_CTL, val);
 395                 I915_WRITE(BLC_PWM_CTL2, dev_priv->regfile.saveBLC_PWM_CTL2);
 396         }
 397
 398         val >>= 16;
 399
 400         if (is_backlight_combination_mode(dev))
 401                 val *= 0xff;
 402
 403         return val;
 404 }
 405
 406 static u32 _vlv_get_max_backlight(struct drm_device *dev, enum pipe pipe)
 407 {
 408         struct drm_i915_private *dev_priv = dev->dev_private;
 409         u32 val;
 410
 411         val = I915_READ(VLV_BLC_PWM_CTL(pipe));
 412         if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 413                 dev_priv->regfile.saveBLC_PWM_CTL = val;
 414                 dev_priv->regfile.saveBLC_PWM_CTL2 =
 415                         I915_READ(VLV_BLC_PWM_CTL2(pipe));
 416         } else if (val == 0) {
 417                 val = dev_priv->regfile.saveBLC_PWM_CTL;
 418                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), val);
 419                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe),
 420                            dev_priv->regfile.saveBLC_PWM_CTL2);
 421         }
 422
 423         if (!val)
 424                 val = 0x0f42ffff;
 425
 426         val >>= 16;
 427
 428         return val;
 429 }
 430
 431 static u32 vlv_get_max_backlight(struct intel_connector *connector)
 432 {
 433         struct drm_device *dev = connector->base.dev;
 434         enum pipe pipe = intel_get_pipe_from_connector(connector);
 435
 436         return _vlv_get_max_backlight(dev, pipe);
 437 }
 438
 439 /* XXX: query mode clock or hardware clock and program max PWM appropriately
 440  * when it's 0.
 441  */
 442 static u32 intel_panel_get_max_backlight(struct intel_connector *connector)
 443 {
 444         struct drm_device *dev = connector->base.dev;
 445         struct drm_i915_private *dev_priv = dev->dev_private;
 446         u32 max;
 447
 448         WARN_ON_SMP(!spin_is_locked(&dev_priv->backlight_lock));
 449
 450         max = dev_priv->display.get_max_backlight(connector);
 451
 452         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 453
 454         return max;
 455 }
 456
 457 static int i915_panel_invert_brightness;
 458 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 459         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 460         "report PCI device ID, subsystem vendor and subsystem device ID "
 461         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 462         "It will then be included in an upcoming module version.");
 463 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 464 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 465                                           u32 val)
 466 {
 467         struct drm_device *dev = connector->base.dev;
 468         struct drm_i915_private *dev_priv = dev->dev_private;
 469
 470         if (i915_panel_invert_brightness < 0)
 471                 return val;
 472
 473         if (i915_panel_invert_brightness > 0 ||
 474             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 475                 u32 max = intel_panel_get_max_backlight(connector);
 476                 if (max)
 477                         return max - val;
 478         }
 479
 480         return val;
 481 }
 482
 483 static u32 pch_get_backlight(struct intel_connector *connector)
 484 {
 485         struct drm_device *dev = connector->base.dev;
 486         struct drm_i915_private *dev_priv = dev->dev_private;
 487
 488         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 489 }
 490
 491 static u32 i9xx_get_backlight(struct intel_connector *connector)
 492 {
 493         struct drm_device *dev = connector->base.dev;
 494         struct drm_i915_private *dev_priv = dev->dev_private;
 495         u32 val;
 496
 497         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 498         if (INTEL_INFO(dev)->gen < 4)
 499                 val >>= 1;
 500
 501         if (is_backlight_combination_mode(dev)) {
 502                 u8 lbpc;
 503
 504                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 505                 val *= lbpc;
 506         }
 507
 508         return val;
 509 }
 510
 511 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 512 {
 513         struct drm_i915_private *dev_priv = dev->dev_private;
 514
 515         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 516 }
 517
 518 static u32 vlv_get_backlight(struct intel_connector *connector)
 519 {
 520         struct drm_device *dev = connector->base.dev;
 521         enum pipe pipe = intel_get_pipe_from_connector(connector);
 522
 523         return _vlv_get_backlight(dev, pipe);
 524 }
 525
 526 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 527 {
 528         struct drm_device *dev = connector->base.dev;
 529         struct drm_i915_private *dev_priv = dev->dev_private;
 530         u32 val;
 531         unsigned long flags;
 532
 533         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 534
 535         val = dev_priv->display.get_backlight(connector);
 536         val = intel_panel_compute_brightness(connector, val);
 537
 538         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 539
 540         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 541         return val;
 542 }
 543
 544 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 545 {
 546         struct drm_device *dev = connector->base.dev;
 547         struct drm_i915_private *dev_priv = dev->dev_private;
 548         u32 tmp;
 549
 550         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 551         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 552 }
 553
 554 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 555 {
 556         struct drm_device *dev = connector->base.dev;
 557         struct drm_i915_private *dev_priv = dev->dev_private;
 558         u32 tmp, mask;
 559
 560         if (is_backlight_combination_mode(dev)) {
 561                 u32 max = intel_panel_get_max_backlight(connector);
 562                 u8 lbpc;
 563
 564                 /* we're screwed, but keep behaviour backwards compatible */
 565                 if (!max)
 566                         max = 1;
 567
 568                 lbpc = level * 0xfe / max + 1;
 569                 level /= lbpc;
 570                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 571         }
 572
 573         if (IS_GEN4(dev)) {
 574                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 575         } else {
 576                 level <<= 1;
 577                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 578         }
 579
 580         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 581         I915_WRITE(BLC_PWM_CTL, tmp | level);
 582 }
 583
 584 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 585 {
 586         struct drm_device *dev = connector->base.dev;
 587         struct drm_i915_private *dev_priv = dev->dev_private;
 588         enum pipe pipe = intel_get_pipe_from_connector(connector);
 589         u32 tmp;
 590
 591         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 592         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 593 }
 594
 595 static void
 596 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 597 {
 598         struct drm_device *dev = connector->base.dev;
 599         struct drm_i915_private *dev_priv = dev->dev_private;
 600
 601         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 602
 603         level = intel_panel_compute_brightness(connector, level);
 604         dev_priv->display.set_backlight(connector, level);
 605 }
 606
 607 /* set backlight brightness to level in range [0..max] */
 608 void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
 609                                u32 max)
 610 {
 611         struct drm_device *dev = connector->base.dev;
 612         struct drm_i915_private *dev_priv = dev->dev_private;
 613         struct intel_panel *panel = &connector->panel;
 614         enum pipe pipe = intel_get_pipe_from_connector(connector);
 615         u32 freq;
 616         unsigned long flags;
 617
 618         if (pipe == INVALID_PIPE)
 619                 return;
 620
 621         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 622
 623         freq = intel_panel_get_max_backlight(connector);
 624         if (!freq) {
 625                 /* we are screwed, bail out */
 626                 goto out;
 627         }
 628
 629         /* scale to hardware, but be careful to not overflow */
 630         if (freq < max)
 631                 level = level * freq / max;
 632         else
 633                 level = freq / max * level;
 634
 635         panel->backlight.level = level;
 636         if (panel->backlight.device)
 637                 panel->backlight.device->props.brightness = level;
 638
 639         if (panel->backlight.enabled)
 640                 intel_panel_actually_set_backlight(connector, level);
 641 out:
 642         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 643 }
 644
 645 static void pch_disable_backlight(struct intel_connector *connector)
 646 {
 647         struct drm_device *dev = connector->base.dev;
 648         struct drm_i915_private *dev_priv = dev->dev_private;
 649         u32 tmp;
 650
 651         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 652         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 653
 654         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 655         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 656 }
 657
 658 static void i965_disable_backlight(struct intel_connector *connector)
 659 {
 660         struct drm_device *dev = connector->base.dev;
 661         struct drm_i915_private *dev_priv = dev->dev_private;
 662         u32 tmp;
 663
 664         tmp = I915_READ(BLC_PWM_CTL2);
 665         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 666 }
 667
 668 static void vlv_disable_backlight(struct intel_connector *connector)
 669 {
 670         struct drm_device *dev = connector->base.dev;
 671         struct drm_i915_private *dev_priv = dev->dev_private;
 672         enum pipe pipe = intel_get_pipe_from_connector(connector);
 673         u32 tmp;
 674
 675         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 676         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 677 }
 678
 679 void intel_panel_disable_backlight(struct intel_connector *connector)
 680 {
 681         struct drm_device *dev = connector->base.dev;
 682         struct drm_i915_private *dev_priv = dev->dev_private;
 683         struct intel_panel *panel = &connector->panel;
 684         enum pipe pipe = intel_get_pipe_from_connector(connector);
 685         unsigned long flags;
 686
 687         if (pipe == INVALID_PIPE)
 688                 return;
 689
 690         /*
 691          * Do not disable backlight on the vgaswitcheroo path. When switching
 692          * away from i915, the other client may depend on i915 to handle the
 693          * backlight. This will leave the backlight on unnecessarily when
 694          * another client is not activated.
 695          */
 696         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 697                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 698                 return;
 699         }
 700
 701         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 702
 703         panel->backlight.enabled = false;
 704         intel_panel_actually_set_backlight(connector, 0);
 705
 706         if (dev_priv->display.disable_backlight)
 707                 dev_priv->display.disable_backlight(connector);
 708
 709         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 710 }
 711
 712 static void pch_enable_backlight(struct intel_connector *connector)
 713 {
 714         struct drm_device *dev = connector->base.dev;
 715         struct drm_i915_private *dev_priv = dev->dev_private;
 716         enum pipe pipe = intel_get_pipe_from_connector(connector);
 717         enum transcoder cpu_transcoder =
 718                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 719         u32 tmp;
 720
 721         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 722
 723         /* Note that this can also get called through dpms changes. And
 724          * we don't track the backlight dpms state, hence check whether
 725          * we have to do anything first. */
 726         if (tmp & BLM_PWM_ENABLE)
 727                 return;
 728
 729         if (INTEL_INFO(dev)->num_pipes == 3)
 730                 tmp &= ~BLM_PIPE_SELECT_IVB;
 731         else
 732                 tmp &= ~BLM_PIPE_SELECT;
 733
 734         if (cpu_transcoder == TRANSCODER_EDP)
 735                 tmp |= BLM_TRANSCODER_EDP;
 736         else
 737                 tmp |= BLM_PIPE(cpu_transcoder);
 738         tmp &= ~BLM_PWM_ENABLE;
 739
 740         I915_WRITE(BLC_PWM_CPU_CTL2, tmp);
 741         POSTING_READ(BLC_PWM_CPU_CTL2);
 742         I915_WRITE(BLC_PWM_CPU_CTL2, tmp | BLM_PWM_ENABLE);
 743
 744         if (!(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {
 745                 tmp = I915_READ(BLC_PWM_PCH_CTL1);
 746                 tmp |= BLM_PCH_PWM_ENABLE;
 747                 tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 748                 I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 749         }
 750 }
 751
 752 static void i965_enable_backlight(struct intel_connector *connector)
 753 {
 754         struct drm_device *dev = connector->base.dev;
 755         struct drm_i915_private *dev_priv = dev->dev_private;
 756         enum pipe pipe = intel_get_pipe_from_connector(connector);
 757         u32 tmp;
 758
 759         tmp = I915_READ(BLC_PWM_CTL2);
 760
 761         /* Note that this can also get called through dpms changes. And
 762          * we don't track the backlight dpms state, hence check whether
 763          * we have to do anything first. */
 764         if (tmp & BLM_PWM_ENABLE)
 765                 return;
 766
 767         tmp &= ~BLM_PIPE_SELECT;
 768         tmp |= BLM_PIPE(pipe);
 769         tmp &= ~BLM_PWM_ENABLE;
 770
 771         I915_WRITE(BLC_PWM_CTL2, tmp);
 772         POSTING_READ(BLC_PWM_CTL2);
 773         I915_WRITE(BLC_PWM_CTL2, tmp | BLM_PWM_ENABLE);
 774 }
 775
 776 static void vlv_enable_backlight(struct intel_connector *connector)
 777 {
 778         struct drm_device *dev = connector->base.dev;
 779         struct drm_i915_private *dev_priv = dev->dev_private;
 780         enum pipe pipe = intel_get_pipe_from_connector(connector);
 781         u32 tmp;
 782
 783         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 784
 785         /* Note that this can also get called through dpms changes. And
 786          * we don't track the backlight dpms state, hence check whether
 787          * we have to do anything first. */
 788         if (tmp & BLM_PWM_ENABLE)
 789                 return;
 790
 791         tmp &= ~BLM_PIPE_SELECT;
 792         tmp |= BLM_PIPE(pipe);
 793         tmp &= ~BLM_PWM_ENABLE;
 794
 795         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp);
 796         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 797         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp | BLM_PWM_ENABLE);
 798 }
 799
 800 void intel_panel_enable_backlight(struct intel_connector *connector)
 801 {
 802         struct drm_device *dev = connector->base.dev;
 803         struct drm_i915_private *dev_priv = dev->dev_private;
 804         struct intel_panel *panel = &connector->panel;
 805         enum pipe pipe = intel_get_pipe_from_connector(connector);
 806         unsigned long flags;
 807
 808         if (pipe == INVALID_PIPE)
 809                 return;
 810
 811         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 812
 813         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 814
 815         if (panel->backlight.level == 0) {
 816                 panel->backlight.level = intel_panel_get_max_backlight(connector);
 817                 if (panel->backlight.device)
 818                         panel->backlight.device->props.brightness =
 819                                 panel->backlight.level;
 820         }
 821
 822         if (dev_priv->display.enable_backlight)
 823                 dev_priv->display.enable_backlight(connector);
 824
 825         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 826          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 827          * registers are set.
 828          */
 829         panel->backlight.enabled = true;
 830         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 831
 832         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 833 }
 834
 835 enum drm_connector_status
 836 intel_panel_detect(struct drm_device *dev)
 837 {
 838         struct drm_i915_private *dev_priv = dev->dev_private;
 839
 840         /* Assume that the BIOS does not lie through the OpRegion... */
 841         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
 842                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 843                         connector_status_connected :
 844                         connector_status_disconnected;
 845         }
 846
 847         switch (i915_panel_ignore_lid) {
 848         case -2:
 849                 return connector_status_connected;
 850         case -1:
 851                 return connector_status_disconnected;
 852         default:
 853                 return connector_status_unknown;
 854         }
 855 }
 856
 857 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 858 static int intel_backlight_device_update_status(struct backlight_device *bd)
 859 {
 860         struct intel_connector *connector = bl_get_data(bd);
 861         struct drm_device *dev = connector->base.dev;
 862
 863         mutex_lock(&dev->mode_config.mutex);
 864         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 865                       bd->props.brightness, bd->props.max_brightness);
 866         intel_panel_set_backlight(connector, bd->props.brightness,
 867                                   bd->props.max_brightness);
 868         mutex_unlock(&dev->mode_config.mutex);
 869         return 0;
 870 }
 871
 872 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 873 {
 874         struct intel_connector *connector = bl_get_data(bd);
 875         struct drm_device *dev = connector->base.dev;
 876         int ret;
 877
 878         mutex_lock(&dev->mode_config.mutex);
 879         ret = intel_panel_get_backlight(connector);
 880         mutex_unlock(&dev->mode_config.mutex);
 881
 882         return ret;
 883 }
 884
 885 static const struct backlight_ops intel_backlight_device_ops = {
 886         .update_status = intel_backlight_device_update_status,
 887         .get_brightness = intel_backlight_device_get_brightness,
 888 };
 889
 890 static int intel_backlight_device_register(struct intel_connector *connector)
 891 {
 892         struct intel_panel *panel = &connector->panel;
 893         struct backlight_properties props;
 894
 895         if (WARN_ON(panel->backlight.device))
 896                 return -ENODEV;
 897
 898         BUG_ON(panel->backlight.max == 0);
 899
 900         memset(&props, 0, sizeof(props));
 901         props.type = BACKLIGHT_RAW;
 902         props.brightness = panel->backlight.level;
 903         props.max_brightness = panel->backlight.max;
 904
 905         /*
 906          * Note: using the same name independent of the connector prevents
 907          * registration of multiple backlight devices in the driver.
 908          */
 909         panel->backlight.device =
 910                 backlight_device_register("intel_backlight",
 911                                           connector->base.kdev,
 912                                           connector,
 913                                           &intel_backlight_device_ops, &props);
 914
 915         if (IS_ERR(panel->backlight.device)) {
 916                 DRM_ERROR("Failed to register backlight: %ld\n",
 917                           PTR_ERR(panel->backlight.device));
 918                 panel->backlight.device = NULL;
 919                 return -ENODEV;
 920         }
 921         return 0;
 922 }
 923
 924 static void intel_backlight_device_unregister(struct intel_connector *connector)
 925 {
 926         struct intel_panel *panel = &connector->panel;
 927
 928         if (panel->backlight.device) {
 929                 backlight_device_unregister(panel->backlight.device);
 930                 panel->backlight.device = NULL;
 931         }
 932 }
 933 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 934 static int intel_backlight_device_register(struct intel_connector *connector)
 935 {
 936         return 0;
 937 }
 938 static void intel_backlight_device_unregister(struct intel_connector *connector)
 939 {
 940 }
 941 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 942
 943 /* Note: The setup hooks can't assume pipe is set! */
 944 static int pch_setup_backlight(struct intel_connector *connector)
 945 {
 946         struct intel_panel *panel = &connector->panel;
 947         u32 val;
 948
 949         panel->backlight.max = pch_get_max_backlight(connector);
 950         if (!panel->backlight.max)
 951                 return -ENODEV;
 952
 953         val = pch_get_backlight(connector);
 954         panel->backlight.level = intel_panel_compute_brightness(connector, val);
 955
 956         return 0;
 957 }
 958
 959 static int i9xx_setup_backlight(struct intel_connector *connector)
 960 {
 961         struct intel_panel *panel = &connector->panel;
 962         u32 val;
 963
 964         panel->backlight.max = i9xx_get_max_backlight(connector);
 965         if (!panel->backlight.max)
 966                 return -ENODEV;
 967
 968         val = i9xx_get_backlight(connector);
 969         panel->backlight.level = intel_panel_compute_brightness(connector, val);
 970
 971         return 0;
 972 }
 973
 974 static int i965_setup_backlight(struct intel_connector *connector)
 975 {
 976         struct intel_panel *panel = &connector->panel;
 977         u32 val;
 978
 979         panel->backlight.max = i965_get_max_backlight(connector);
 980         if (!panel->backlight.max)
 981                 return -ENODEV;
 982
 983         val = i9xx_get_backlight(connector);
 984         panel->backlight.level = intel_panel_compute_brightness(connector, val);
 985
 986         return 0;
 987 }
 988
 989 static int vlv_setup_backlight(struct intel_connector *connector)
 990 {
 991         struct drm_device *dev = connector->base.dev;
 992         struct drm_i915_private *dev_priv = dev->dev_private;
 993         struct intel_panel *panel = &connector->panel;
 994         enum pipe pipe;
 995         u32 val;
 996
 997         for_each_pipe(pipe) {
 998                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
 999
1000                 /* Skip if the modulation freq is already set */
1001                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1002                         continue;
1003
1004                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1005                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1006                            cur_val);
1007         }
1008
1009         panel->backlight.max = _vlv_get_max_backlight(dev, PIPE_A);
1010         if (!panel->backlight.max)
1011                 return -ENODEV;
1012
1013         val = _vlv_get_backlight(dev, PIPE_A);
1014         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1015
1016         return 0;
1017 }
1018
1019 int intel_panel_setup_backlight(struct drm_connector *connector)
1020 {
1021         struct drm_device *dev = connector->dev;
1022         struct drm_i915_private *dev_priv = dev->dev_private;
1023         struct intel_connector *intel_connector = to_intel_connector(connector);
1024         struct intel_panel *panel = &intel_connector->panel;
1025         unsigned long flags;
1026         int ret;
1027
1028         /* set level and max in panel struct */
1029         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
1030         ret = dev_priv->display.setup_backlight(intel_connector);
1031         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
1032
1033         if (ret) {
1034                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1035                               drm_get_connector_name(connector));
1036                 return ret;
1037         }
1038
1039         panel->backlight.enabled = panel->backlight.level != 0;
1040
1041         intel_backlight_device_register(intel_connector);
1042
1043         panel->backlight.present = true;
1044
1045         return 0;
1046 }
1047
1048 void intel_panel_destroy_backlight(struct drm_connector *connector)
1049 {
1050         struct intel_connector *intel_connector = to_intel_connector(connector);
1051         struct intel_panel *panel = &intel_connector->panel;
1052
1053         panel->backlight.present = false;
1054         intel_backlight_device_unregister(intel_connector);
1055 }
1056
1057 /* Set up chip specific backlight functions */
1058 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1059 {
1060         struct drm_i915_private *dev_priv = dev->dev_private;
1061
1062         if (HAS_PCH_SPLIT(dev)) {
1063                 dev_priv->display.setup_backlight = pch_setup_backlight;
1064                 dev_priv->display.enable_backlight = pch_enable_backlight;
1065                 dev_priv->display.disable_backlight = pch_disable_backlight;
1066                 dev_priv->display.set_backlight = pch_set_backlight;
1067                 dev_priv->display.get_backlight = pch_get_backlight;
1068                 dev_priv->display.get_max_backlight = pch_get_max_backlight;
1069         } else if (IS_VALLEYVIEW(dev)) {
1070                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1071                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1072                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1073                 dev_priv->display.set_backlight = vlv_set_backlight;
1074                 dev_priv->display.get_backlight = vlv_get_backlight;
1075                 dev_priv->display.get_max_backlight = vlv_get_max_backlight;
1076         } else if (IS_GEN4(dev)) {
1077                 dev_priv->display.setup_backlight = i965_setup_backlight;
1078                 dev_priv->display.enable_backlight = i965_enable_backlight;
1079                 dev_priv->display.disable_backlight = i965_disable_backlight;
1080                 dev_priv->display.set_backlight = i9xx_set_backlight;
1081                 dev_priv->display.get_backlight = i9xx_get_backlight;
1082                 dev_priv->display.get_max_backlight = i965_get_max_backlight;
1083         } else {
1084                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1085                 dev_priv->display.set_backlight = i9xx_set_backlight;
1086                 dev_priv->display.get_backlight = i9xx_get_backlight;
1087                 dev_priv->display.get_max_backlight = i9xx_get_max_backlight;
1088         }
1089 }
1090
1091 int intel_panel_init(struct intel_panel *panel,
1092                      struct drm_display_mode *fixed_mode)
1093 {
1094         panel->fixed_mode = fixed_mode;
1095
1096         return 0;
1097 }
1098
1099 void intel_panel_fini(struct intel_panel *panel)
1100 {
1101         struct intel_connector *intel_connector =
1102                 container_of(panel, struct intel_connector, panel);
1103
1104         if (panel->fixed_mode)
1105                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1106 }