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 static u32 intel_panel_get_max_backlight(struct intel_connector *connector)
 440 {
 441         struct drm_device *dev = connector->base.dev;
 442         struct drm_i915_private *dev_priv = dev->dev_private;
 443         u32 max;
 444
 445         WARN_ON_SMP(!spin_is_locked(&dev_priv->backlight_lock));
 446
 447         max = dev_priv->display.get_max_backlight(connector);
 448
 449         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 450
 451         return max;
 452 }
 453
 454 static int i915_panel_invert_brightness;
 455 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 456         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 457         "report PCI device ID, subsystem vendor and subsystem device ID "
 458         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 459         "It will then be included in an upcoming module version.");
 460 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 461 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 462                                           u32 val)
 463 {
 464         struct drm_device *dev = connector->base.dev;
 465         struct drm_i915_private *dev_priv = dev->dev_private;
 466         struct intel_panel *panel = &connector->panel;
 467
 468         WARN_ON(panel->backlight.max == 0);
 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                 return panel->backlight.max - val;
 476         }
 477
 478         return val;
 479 }
 480
 481 static u32 pch_get_backlight(struct intel_connector *connector)
 482 {
 483         struct drm_device *dev = connector->base.dev;
 484         struct drm_i915_private *dev_priv = dev->dev_private;
 485
 486         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 487 }
 488
 489 static u32 i9xx_get_backlight(struct intel_connector *connector)
 490 {
 491         struct drm_device *dev = connector->base.dev;
 492         struct drm_i915_private *dev_priv = dev->dev_private;
 493         u32 val;
 494
 495         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 496         if (INTEL_INFO(dev)->gen < 4)
 497                 val >>= 1;
 498
 499         if (is_backlight_combination_mode(dev)) {
 500                 u8 lbpc;
 501
 502                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 503                 val *= lbpc;
 504         }
 505
 506         return val;
 507 }
 508
 509 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 510 {
 511         struct drm_i915_private *dev_priv = dev->dev_private;
 512
 513         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 514 }
 515
 516 static u32 vlv_get_backlight(struct intel_connector *connector)
 517 {
 518         struct drm_device *dev = connector->base.dev;
 519         enum pipe pipe = intel_get_pipe_from_connector(connector);
 520
 521         return _vlv_get_backlight(dev, pipe);
 522 }
 523
 524 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 525 {
 526         struct drm_device *dev = connector->base.dev;
 527         struct drm_i915_private *dev_priv = dev->dev_private;
 528         u32 val;
 529         unsigned long flags;
 530
 531         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 532
 533         val = dev_priv->display.get_backlight(connector);
 534         val = intel_panel_compute_brightness(connector, val);
 535
 536         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 537
 538         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 539         return val;
 540 }
 541
 542 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 543 {
 544         struct drm_device *dev = connector->base.dev;
 545         struct drm_i915_private *dev_priv = dev->dev_private;
 546         u32 tmp;
 547
 548         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 549         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 550 }
 551
 552 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 553 {
 554         struct drm_device *dev = connector->base.dev;
 555         struct drm_i915_private *dev_priv = dev->dev_private;
 556         struct intel_panel *panel = &connector->panel;
 557         u32 tmp, mask;
 558
 559         WARN_ON(panel->backlight.max == 0);
 560
 561         if (is_backlight_combination_mode(dev)) {
 562                 u8 lbpc;
 563
 564                 lbpc = level * 0xfe / panel->backlight.max + 1;
 565                 level /= lbpc;
 566                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 567         }
 568
 569         if (IS_GEN4(dev)) {
 570                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 571         } else {
 572                 level <<= 1;
 573                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 574         }
 575
 576         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 577         I915_WRITE(BLC_PWM_CTL, tmp | level);
 578 }
 579
 580 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 581 {
 582         struct drm_device *dev = connector->base.dev;
 583         struct drm_i915_private *dev_priv = dev->dev_private;
 584         enum pipe pipe = intel_get_pipe_from_connector(connector);
 585         u32 tmp;
 586
 587         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 588         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 589 }
 590
 591 static void
 592 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 593 {
 594         struct drm_device *dev = connector->base.dev;
 595         struct drm_i915_private *dev_priv = dev->dev_private;
 596
 597         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 598
 599         level = intel_panel_compute_brightness(connector, level);
 600         dev_priv->display.set_backlight(connector, level);
 601 }
 602
 603 /* set backlight brightness to level in range [0..max] */
 604 void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
 605                                u32 max)
 606 {
 607         struct drm_device *dev = connector->base.dev;
 608         struct drm_i915_private *dev_priv = dev->dev_private;
 609         struct intel_panel *panel = &connector->panel;
 610         enum pipe pipe = intel_get_pipe_from_connector(connector);
 611         u32 freq;
 612         unsigned long flags;
 613
 614         if (pipe == INVALID_PIPE)
 615                 return;
 616
 617         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 618
 619         WARN_ON(panel->backlight.max == 0);
 620
 621         /* scale to hardware max, but be careful to not overflow */
 622         freq = panel->backlight.max;
 623         if (freq < max)
 624                 level = level * freq / max;
 625         else
 626                 level = freq / max * level;
 627
 628         panel->backlight.level = level;
 629         if (panel->backlight.device)
 630                 panel->backlight.device->props.brightness = level;
 631
 632         if (panel->backlight.enabled)
 633                 intel_panel_actually_set_backlight(connector, level);
 634
 635         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 636 }
 637
 638 static void pch_disable_backlight(struct intel_connector *connector)
 639 {
 640         struct drm_device *dev = connector->base.dev;
 641         struct drm_i915_private *dev_priv = dev->dev_private;
 642         u32 tmp;
 643
 644         intel_panel_actually_set_backlight(connector, 0);
 645
 646         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 647         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 648
 649         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 650         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 651 }
 652
 653 static void i9xx_disable_backlight(struct intel_connector *connector)
 654 {
 655         intel_panel_actually_set_backlight(connector, 0);
 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         intel_panel_actually_set_backlight(connector, 0);
 665
 666         tmp = I915_READ(BLC_PWM_CTL2);
 667         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 668 }
 669
 670 static void vlv_disable_backlight(struct intel_connector *connector)
 671 {
 672         struct drm_device *dev = connector->base.dev;
 673         struct drm_i915_private *dev_priv = dev->dev_private;
 674         enum pipe pipe = intel_get_pipe_from_connector(connector);
 675         u32 tmp;
 676
 677         intel_panel_actually_set_backlight(connector, 0);
 678
 679         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 680         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 681 }
 682
 683 void intel_panel_disable_backlight(struct intel_connector *connector)
 684 {
 685         struct drm_device *dev = connector->base.dev;
 686         struct drm_i915_private *dev_priv = dev->dev_private;
 687         struct intel_panel *panel = &connector->panel;
 688         enum pipe pipe = intel_get_pipe_from_connector(connector);
 689         unsigned long flags;
 690
 691         if (pipe == INVALID_PIPE)
 692                 return;
 693
 694         /*
 695          * Do not disable backlight on the vgaswitcheroo path. When switching
 696          * away from i915, the other client may depend on i915 to handle the
 697          * backlight. This will leave the backlight on unnecessarily when
 698          * another client is not activated.
 699          */
 700         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 701                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 702                 return;
 703         }
 704
 705         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 706
 707         panel->backlight.enabled = false;
 708         dev_priv->display.disable_backlight(connector);
 709
 710         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 711 }
 712
 713 static void pch_enable_backlight(struct intel_connector *connector)
 714 {
 715         struct drm_device *dev = connector->base.dev;
 716         struct drm_i915_private *dev_priv = dev->dev_private;
 717         struct intel_panel *panel = &connector->panel;
 718         enum pipe pipe = intel_get_pipe_from_connector(connector);
 719         enum transcoder cpu_transcoder =
 720                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 721         u32 tmp;
 722
 723         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 724
 725         /* Note that this can also get called through dpms changes. And
 726          * we don't track the backlight dpms state, hence check whether
 727          * we have to do anything first. */
 728         if (tmp & BLM_PWM_ENABLE)
 729                 return;
 730
 731         if (INTEL_INFO(dev)->num_pipes == 3)
 732                 tmp &= ~BLM_PIPE_SELECT_IVB;
 733         else
 734                 tmp &= ~BLM_PIPE_SELECT;
 735
 736         if (cpu_transcoder == TRANSCODER_EDP)
 737                 tmp |= BLM_TRANSCODER_EDP;
 738         else
 739                 tmp |= BLM_PIPE(cpu_transcoder);
 740         tmp &= ~BLM_PWM_ENABLE;
 741
 742         I915_WRITE(BLC_PWM_CPU_CTL2, tmp);
 743         POSTING_READ(BLC_PWM_CPU_CTL2);
 744         I915_WRITE(BLC_PWM_CPU_CTL2, tmp | BLM_PWM_ENABLE);
 745
 746         if (!(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {
 747                 tmp = I915_READ(BLC_PWM_PCH_CTL1);
 748                 tmp |= BLM_PCH_PWM_ENABLE;
 749                 tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 750                 I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 751         }
 752
 753         /*
 754          * Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 755          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 756          * registers are set.
 757          */
 758         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 759 }
 760
 761 static void i9xx_enable_backlight(struct intel_connector *connector)
 762 {
 763         struct intel_panel *panel = &connector->panel;
 764
 765         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 766 }
 767
 768 static void i965_enable_backlight(struct intel_connector *connector)
 769 {
 770         struct drm_device *dev = connector->base.dev;
 771         struct drm_i915_private *dev_priv = dev->dev_private;
 772         struct intel_panel *panel = &connector->panel;
 773         enum pipe pipe = intel_get_pipe_from_connector(connector);
 774         u32 tmp;
 775
 776         tmp = I915_READ(BLC_PWM_CTL2);
 777
 778         /* Note that this can also get called through dpms changes. And
 779          * we don't track the backlight dpms state, hence check whether
 780          * we have to do anything first. */
 781         if (tmp & BLM_PWM_ENABLE)
 782                 return;
 783
 784         tmp &= ~BLM_PIPE_SELECT;
 785         tmp |= BLM_PIPE(pipe);
 786         tmp &= ~BLM_PWM_ENABLE;
 787
 788         I915_WRITE(BLC_PWM_CTL2, tmp);
 789         POSTING_READ(BLC_PWM_CTL2);
 790         I915_WRITE(BLC_PWM_CTL2, tmp | BLM_PWM_ENABLE);
 791
 792         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 793 }
 794
 795 static void vlv_enable_backlight(struct intel_connector *connector)
 796 {
 797         struct drm_device *dev = connector->base.dev;
 798         struct drm_i915_private *dev_priv = dev->dev_private;
 799         struct intel_panel *panel = &connector->panel;
 800         enum pipe pipe = intel_get_pipe_from_connector(connector);
 801         u32 tmp;
 802
 803         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 804
 805         /* Note that this can also get called through dpms changes. And
 806          * we don't track the backlight dpms state, hence check whether
 807          * we have to do anything first. */
 808         if (tmp & BLM_PWM_ENABLE)
 809                 return;
 810
 811         tmp &= ~BLM_PWM_ENABLE;
 812
 813         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp);
 814         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
 815         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp | BLM_PWM_ENABLE);
 816
 817         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 818 }
 819
 820 void intel_panel_enable_backlight(struct intel_connector *connector)
 821 {
 822         struct drm_device *dev = connector->base.dev;
 823         struct drm_i915_private *dev_priv = dev->dev_private;
 824         struct intel_panel *panel = &connector->panel;
 825         enum pipe pipe = intel_get_pipe_from_connector(connector);
 826         unsigned long flags;
 827
 828         if (pipe == INVALID_PIPE)
 829                 return;
 830
 831         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
 832
 833         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
 834
 835         /* XXX: transitional, call to make sure freq is set */
 836         intel_panel_get_max_backlight(connector);
 837
 838         WARN_ON(panel->backlight.max == 0);
 839
 840         if (panel->backlight.level == 0) {
 841                 panel->backlight.level = panel->backlight.max;
 842                 if (panel->backlight.device)
 843                         panel->backlight.device->props.brightness =
 844                                 panel->backlight.level;
 845         }
 846
 847         dev_priv->display.enable_backlight(connector);
 848         panel->backlight.enabled = true;
 849
 850         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
 851 }
 852
 853 enum drm_connector_status
 854 intel_panel_detect(struct drm_device *dev)
 855 {
 856         struct drm_i915_private *dev_priv = dev->dev_private;
 857
 858         /* Assume that the BIOS does not lie through the OpRegion... */
 859         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
 860                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 861                         connector_status_connected :
 862                         connector_status_disconnected;
 863         }
 864
 865         switch (i915_panel_ignore_lid) {
 866         case -2:
 867                 return connector_status_connected;
 868         case -1:
 869                 return connector_status_disconnected;
 870         default:
 871                 return connector_status_unknown;
 872         }
 873 }
 874
 875 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 876 static int intel_backlight_device_update_status(struct backlight_device *bd)
 877 {
 878         struct intel_connector *connector = bl_get_data(bd);
 879         struct drm_device *dev = connector->base.dev;
 880
 881         mutex_lock(&dev->mode_config.mutex);
 882         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 883                       bd->props.brightness, bd->props.max_brightness);
 884         intel_panel_set_backlight(connector, bd->props.brightness,
 885                                   bd->props.max_brightness);
 886         mutex_unlock(&dev->mode_config.mutex);
 887         return 0;
 888 }
 889
 890 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 891 {
 892         struct intel_connector *connector = bl_get_data(bd);
 893         struct drm_device *dev = connector->base.dev;
 894         int ret;
 895
 896         mutex_lock(&dev->mode_config.mutex);
 897         ret = intel_panel_get_backlight(connector);
 898         mutex_unlock(&dev->mode_config.mutex);
 899
 900         return ret;
 901 }
 902
 903 static const struct backlight_ops intel_backlight_device_ops = {
 904         .update_status = intel_backlight_device_update_status,
 905         .get_brightness = intel_backlight_device_get_brightness,
 906 };
 907
 908 static int intel_backlight_device_register(struct intel_connector *connector)
 909 {
 910         struct intel_panel *panel = &connector->panel;
 911         struct backlight_properties props;
 912
 913         if (WARN_ON(panel->backlight.device))
 914                 return -ENODEV;
 915
 916         BUG_ON(panel->backlight.max == 0);
 917
 918         memset(&props, 0, sizeof(props));
 919         props.type = BACKLIGHT_RAW;
 920         props.brightness = panel->backlight.level;
 921         props.max_brightness = panel->backlight.max;
 922
 923         /*
 924          * Note: using the same name independent of the connector prevents
 925          * registration of multiple backlight devices in the driver.
 926          */
 927         panel->backlight.device =
 928                 backlight_device_register("intel_backlight",
 929                                           connector->base.kdev,
 930                                           connector,
 931                                           &intel_backlight_device_ops, &props);
 932
 933         if (IS_ERR(panel->backlight.device)) {
 934                 DRM_ERROR("Failed to register backlight: %ld\n",
 935                           PTR_ERR(panel->backlight.device));
 936                 panel->backlight.device = NULL;
 937                 return -ENODEV;
 938         }
 939         return 0;
 940 }
 941
 942 static void intel_backlight_device_unregister(struct intel_connector *connector)
 943 {
 944         struct intel_panel *panel = &connector->panel;
 945
 946         if (panel->backlight.device) {
 947                 backlight_device_unregister(panel->backlight.device);
 948                 panel->backlight.device = NULL;
 949         }
 950 }
 951 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 952 static int intel_backlight_device_register(struct intel_connector *connector)
 953 {
 954         return 0;
 955 }
 956 static void intel_backlight_device_unregister(struct intel_connector *connector)
 957 {
 958 }
 959 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 960
 961 /*
 962  * Note: The setup hooks can't assume pipe is set!
 963  *
 964  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
 965  * appropriately when it's 0. Use VBT and/or sane defaults.
 966  */
 967 static int pch_setup_backlight(struct intel_connector *connector)
 968 {
 969         struct intel_panel *panel = &connector->panel;
 970         u32 val;
 971
 972         panel->backlight.max = pch_get_max_backlight(connector);
 973         if (!panel->backlight.max)
 974                 return -ENODEV;
 975
 976         val = pch_get_backlight(connector);
 977         panel->backlight.level = intel_panel_compute_brightness(connector, val);
 978
 979         return 0;
 980 }
 981
 982 static int i9xx_setup_backlight(struct intel_connector *connector)
 983 {
 984         struct intel_panel *panel = &connector->panel;
 985         u32 val;
 986
 987         panel->backlight.max = i9xx_get_max_backlight(connector);
 988         if (!panel->backlight.max)
 989                 return -ENODEV;
 990
 991         val = i9xx_get_backlight(connector);
 992         panel->backlight.level = intel_panel_compute_brightness(connector, val);
 993
 994         return 0;
 995 }
 996
 997 static int i965_setup_backlight(struct intel_connector *connector)
 998 {
 999         struct intel_panel *panel = &connector->panel;
1000         u32 val;
1001
1002         panel->backlight.max = i965_get_max_backlight(connector);
1003         if (!panel->backlight.max)
1004                 return -ENODEV;
1005
1006         val = i9xx_get_backlight(connector);
1007         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1008
1009         return 0;
1010 }
1011
1012 static int vlv_setup_backlight(struct intel_connector *connector)
1013 {
1014         struct drm_device *dev = connector->base.dev;
1015         struct drm_i915_private *dev_priv = dev->dev_private;
1016         struct intel_panel *panel = &connector->panel;
1017         enum pipe pipe;
1018         u32 val;
1019
1020         for_each_pipe(pipe) {
1021                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
1022
1023                 /* Skip if the modulation freq is already set */
1024                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1025                         continue;
1026
1027                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1028                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
1029                            cur_val);
1030         }
1031
1032         panel->backlight.max = _vlv_get_max_backlight(dev, PIPE_A);
1033         if (!panel->backlight.max)
1034                 return -ENODEV;
1035
1036         val = _vlv_get_backlight(dev, PIPE_A);
1037         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1038
1039         return 0;
1040 }
1041
1042 int intel_panel_setup_backlight(struct drm_connector *connector)
1043 {
1044         struct drm_device *dev = connector->dev;
1045         struct drm_i915_private *dev_priv = dev->dev_private;
1046         struct intel_connector *intel_connector = to_intel_connector(connector);
1047         struct intel_panel *panel = &intel_connector->panel;
1048         unsigned long flags;
1049         int ret;
1050
1051         /* set level and max in panel struct */
1052         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
1053         ret = dev_priv->display.setup_backlight(intel_connector);
1054         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
1055
1056         if (ret) {
1057                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1058                               drm_get_connector_name(connector));
1059                 return ret;
1060         }
1061
1062         panel->backlight.enabled = panel->backlight.level != 0;
1063
1064         intel_backlight_device_register(intel_connector);
1065
1066         panel->backlight.present = true;
1067
1068         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
1069                       "sysfs interface %sregistered\n",
1070                       panel->backlight.enabled ? "enabled" : "disabled",
1071                       panel->backlight.level, panel->backlight.max,
1072                       panel->backlight.device ? "" : "not ");
1073
1074         return 0;
1075 }
1076
1077 void intel_panel_destroy_backlight(struct drm_connector *connector)
1078 {
1079         struct intel_connector *intel_connector = to_intel_connector(connector);
1080         struct intel_panel *panel = &intel_connector->panel;
1081
1082         panel->backlight.present = false;
1083         intel_backlight_device_unregister(intel_connector);
1084 }
1085
1086 /* Set up chip specific backlight functions */
1087 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1088 {
1089         struct drm_i915_private *dev_priv = dev->dev_private;
1090
1091         if (HAS_PCH_SPLIT(dev)) {
1092                 dev_priv->display.setup_backlight = pch_setup_backlight;
1093                 dev_priv->display.enable_backlight = pch_enable_backlight;
1094                 dev_priv->display.disable_backlight = pch_disable_backlight;
1095                 dev_priv->display.set_backlight = pch_set_backlight;
1096                 dev_priv->display.get_backlight = pch_get_backlight;
1097                 dev_priv->display.get_max_backlight = pch_get_max_backlight;
1098         } else if (IS_VALLEYVIEW(dev)) {
1099                 dev_priv->display.setup_backlight = vlv_setup_backlight;
1100                 dev_priv->display.enable_backlight = vlv_enable_backlight;
1101                 dev_priv->display.disable_backlight = vlv_disable_backlight;
1102                 dev_priv->display.set_backlight = vlv_set_backlight;
1103                 dev_priv->display.get_backlight = vlv_get_backlight;
1104                 dev_priv->display.get_max_backlight = vlv_get_max_backlight;
1105         } else if (IS_GEN4(dev)) {
1106                 dev_priv->display.setup_backlight = i965_setup_backlight;
1107                 dev_priv->display.enable_backlight = i965_enable_backlight;
1108                 dev_priv->display.disable_backlight = i965_disable_backlight;
1109                 dev_priv->display.set_backlight = i9xx_set_backlight;
1110                 dev_priv->display.get_backlight = i9xx_get_backlight;
1111                 dev_priv->display.get_max_backlight = i965_get_max_backlight;
1112         } else {
1113                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1114                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1115                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1116                 dev_priv->display.set_backlight = i9xx_set_backlight;
1117                 dev_priv->display.get_backlight = i9xx_get_backlight;
1118                 dev_priv->display.get_max_backlight = i9xx_get_max_backlight;
1119         }
1120 }
1121
1122 int intel_panel_init(struct intel_panel *panel,
1123                      struct drm_display_mode *fixed_mode)
1124 {
1125         panel->fixed_mode = fixed_mode;
1126
1127         return 0;
1128 }
1129
1130 void intel_panel_fini(struct intel_panel *panel)
1131 {
1132         struct intel_connector *intel_connector =
1133                 container_of(panel, struct intel_connector, panel);
1134
1135         if (panel->fixed_mode)
1136                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1137 }