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/kernel.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/pwm.h>
  36 #include "intel_drv.h"
  37
  38 #define CRC_PMIC_PWM_PERIOD_NS  21333
  39
  40 void
  41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  42                        struct drm_display_mode *adjusted_mode)
  43 {
  44         drm_mode_copy(adjusted_mode, fixed_mode);
  45
  46         drm_mode_set_crtcinfo(adjusted_mode, 0);
  47 }
  48
  49 /**
  50  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  51  * @dev: drm device
  52  * @fixed_mode : panel native mode
  53  * @connector: LVDS/eDP connector
  54  *
  55  * Return downclock_avail
  56  * Find the reduced downclock for LVDS/eDP in EDID.
  57  */
  58 struct drm_display_mode *
  59 intel_find_panel_downclock(struct drm_device *dev,
  60                         struct drm_display_mode *fixed_mode,
  61                         struct drm_connector *connector)
  62 {
  63         struct drm_display_mode *scan, *tmp_mode;
  64         int temp_downclock;
  65
  66         temp_downclock = fixed_mode->clock;
  67         tmp_mode = NULL;
  68
  69         list_for_each_entry(scan, &connector->probed_modes, head) {
  70                 /*
  71                  * If one mode has the same resolution with the fixed_panel
  72                  * mode while they have the different refresh rate, it means
  73                  * that the reduced downclock is found. In such
  74                  * case we can set the different FPx0/1 to dynamically select
  75                  * between low and high frequency.
  76                  */
  77                 if (scan->hdisplay == fixed_mode->hdisplay &&
  78                     scan->hsync_start == fixed_mode->hsync_start &&
  79                     scan->hsync_end == fixed_mode->hsync_end &&
  80                     scan->htotal == fixed_mode->htotal &&
  81                     scan->vdisplay == fixed_mode->vdisplay &&
  82                     scan->vsync_start == fixed_mode->vsync_start &&
  83                     scan->vsync_end == fixed_mode->vsync_end &&
  84                     scan->vtotal == fixed_mode->vtotal) {
  85                         if (scan->clock < temp_downclock) {
  86                                 /*
  87                                  * The downclock is already found. But we
  88                                  * expect to find the lower downclock.
  89                                  */
  90                                 temp_downclock = scan->clock;
  91                                 tmp_mode = scan;
  92                         }
  93                 }
  94         }
  95
  96         if (temp_downclock < fixed_mode->clock)
  97                 return drm_mode_duplicate(dev, tmp_mode);
  98         else
  99                 return NULL;
 100 }
 101
 102 /* adjusted_mode has been preset to be the panel's fixed mode */
 103 void
 104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 105                         struct intel_crtc_state *pipe_config,
 106                         int fitting_mode)
 107 {
 108         struct drm_display_mode *adjusted_mode;
 109         int x, y, width, height;
 110
 111         adjusted_mode = &pipe_config->base.adjusted_mode;
 112
 113         x = y = width = height = 0;
 114
 115         /* Native modes don't need fitting */
 116         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 117             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 118                 goto done;
 119
 120         switch (fitting_mode) {
 121         case DRM_MODE_SCALE_CENTER:
 122                 width = pipe_config->pipe_src_w;
 123                 height = pipe_config->pipe_src_h;
 124                 x = (adjusted_mode->hdisplay - width + 1)/2;
 125                 y = (adjusted_mode->vdisplay - height + 1)/2;
 126                 break;
 127
 128         case DRM_MODE_SCALE_ASPECT:
 129                 /* Scale but preserve the aspect ratio */
 130                 {
 131                         u32 scaled_width = adjusted_mode->hdisplay
 132                                 * pipe_config->pipe_src_h;
 133                         u32 scaled_height = pipe_config->pipe_src_w
 134                                 * adjusted_mode->vdisplay;
 135                         if (scaled_width > scaled_height) { /* pillar */
 136                                 width = scaled_height / pipe_config->pipe_src_h;
 137                                 if (width & 1)
 138                                         width++;
 139                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
 140                                 y = 0;
 141                                 height = adjusted_mode->vdisplay;
 142                         } else if (scaled_width < scaled_height) { /* letter */
 143                                 height = scaled_width / pipe_config->pipe_src_w;
 144                                 if (height & 1)
 145                                     height++;
 146                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
 147                                 x = 0;
 148                                 width = adjusted_mode->hdisplay;
 149                         } else {
 150                                 x = y = 0;
 151                                 width = adjusted_mode->hdisplay;
 152                                 height = adjusted_mode->vdisplay;
 153                         }
 154                 }
 155                 break;
 156
 157         case DRM_MODE_SCALE_FULLSCREEN:
 158                 x = y = 0;
 159                 width = adjusted_mode->hdisplay;
 160                 height = adjusted_mode->vdisplay;
 161                 break;
 162
 163         default:
 164                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 165                 return;
 166         }
 167
 168 done:
 169         pipe_config->pch_pfit.pos = (x << 16) | y;
 170         pipe_config->pch_pfit.size = (width << 16) | height;
 171         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 172 }
 173
 174 static void
 175 centre_horizontally(struct drm_display_mode *mode,
 176                     int width)
 177 {
 178         u32 border, sync_pos, blank_width, sync_width;
 179
 180         /* keep the hsync and hblank widths constant */
 181         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
 182         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
 183         sync_pos = (blank_width - sync_width + 1) / 2;
 184
 185         border = (mode->hdisplay - width + 1) / 2;
 186         border += border & 1; /* make the border even */
 187
 188         mode->crtc_hdisplay = width;
 189         mode->crtc_hblank_start = width + border;
 190         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
 191
 192         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
 193         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
 194 }
 195
 196 static void
 197 centre_vertically(struct drm_display_mode *mode,
 198                   int height)
 199 {
 200         u32 border, sync_pos, blank_width, sync_width;
 201
 202         /* keep the vsync and vblank widths constant */
 203         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
 204         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
 205         sync_pos = (blank_width - sync_width + 1) / 2;
 206
 207         border = (mode->vdisplay - height + 1) / 2;
 208
 209         mode->crtc_vdisplay = height;
 210         mode->crtc_vblank_start = height + border;
 211         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
 212
 213         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
 214         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
 215 }
 216
 217 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 218 {
 219         /*
 220          * Floating point operation is not supported. So the FACTOR
 221          * is defined, which can avoid the floating point computation
 222          * when calculating the panel ratio.
 223          */
 224 #define ACCURACY 12
 225 #define FACTOR (1 << ACCURACY)
 226         u32 ratio = source * FACTOR / target;
 227         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 228 }
 229
 230 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 231                               u32 *pfit_control)
 232 {
 233         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 234         u32 scaled_width = adjusted_mode->hdisplay *
 235                 pipe_config->pipe_src_h;
 236         u32 scaled_height = pipe_config->pipe_src_w *
 237                 adjusted_mode->vdisplay;
 238
 239         /* 965+ is easy, it does everything in hw */
 240         if (scaled_width > scaled_height)
 241                 *pfit_control |= PFIT_ENABLE |
 242                         PFIT_SCALING_PILLAR;
 243         else if (scaled_width < scaled_height)
 244                 *pfit_control |= PFIT_ENABLE |
 245                         PFIT_SCALING_LETTER;
 246         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
 247                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 248 }
 249
 250 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 251                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 252                               u32 *border)
 253 {
 254         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 255         u32 scaled_width = adjusted_mode->hdisplay *
 256                 pipe_config->pipe_src_h;
 257         u32 scaled_height = pipe_config->pipe_src_w *
 258                 adjusted_mode->vdisplay;
 259         u32 bits;
 260
 261         /*
 262          * For earlier chips we have to calculate the scaling
 263          * ratio by hand and program it into the
 264          * PFIT_PGM_RATIO register
 265          */
 266         if (scaled_width > scaled_height) { /* pillar */
 267                 centre_horizontally(adjusted_mode,
 268                                     scaled_height /
 269                                     pipe_config->pipe_src_h);
 270
 271                 *border = LVDS_BORDER_ENABLE;
 272                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
 273                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 274                                                     adjusted_mode->vdisplay);
 275
 276                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 277                                              bits << PFIT_VERT_SCALE_SHIFT);
 278                         *pfit_control |= (PFIT_ENABLE |
 279                                           VERT_INTERP_BILINEAR |
 280                                           HORIZ_INTERP_BILINEAR);
 281                 }
 282         } else if (scaled_width < scaled_height) { /* letter */
 283                 centre_vertically(adjusted_mode,
 284                                   scaled_width /
 285                                   pipe_config->pipe_src_w);
 286
 287                 *border = LVDS_BORDER_ENABLE;
 288                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 289                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 290                                                     adjusted_mode->hdisplay);
 291
 292                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 293                                              bits << PFIT_VERT_SCALE_SHIFT);
 294                         *pfit_control |= (PFIT_ENABLE |
 295                                           VERT_INTERP_BILINEAR |
 296                                           HORIZ_INTERP_BILINEAR);
 297                 }
 298         } else {
 299                 /* Aspects match, Let hw scale both directions */
 300                 *pfit_control |= (PFIT_ENABLE |
 301                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 302                                   VERT_INTERP_BILINEAR |
 303                                   HORIZ_INTERP_BILINEAR);
 304         }
 305 }
 306
 307 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 308                               struct intel_crtc_state *pipe_config,
 309                               int fitting_mode)
 310 {
 311         struct drm_device *dev = intel_crtc->base.dev;
 312         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 313         struct drm_display_mode *adjusted_mode;
 314
 315         adjusted_mode = &pipe_config->base.adjusted_mode;
 316
 317         /* Native modes don't need fitting */
 318         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
 319             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
 320                 goto out;
 321
 322         switch (fitting_mode) {
 323         case DRM_MODE_SCALE_CENTER:
 324                 /*
 325                  * For centered modes, we have to calculate border widths &
 326                  * heights and modify the values programmed into the CRTC.
 327                  */
 328                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 329                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 330                 border = LVDS_BORDER_ENABLE;
 331                 break;
 332         case DRM_MODE_SCALE_ASPECT:
 333                 /* Scale but preserve the aspect ratio */
 334                 if (INTEL_INFO(dev)->gen >= 4)
 335                         i965_scale_aspect(pipe_config, &pfit_control);
 336                 else
 337                         i9xx_scale_aspect(pipe_config, &pfit_control,
 338                                           &pfit_pgm_ratios, &border);
 339                 break;
 340         case DRM_MODE_SCALE_FULLSCREEN:
 341                 /*
 342                  * Full scaling, even if it changes the aspect ratio.
 343                  * Fortunately this is all done for us in hw.
 344                  */
 345                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
 346                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
 347                         pfit_control |= PFIT_ENABLE;
 348                         if (INTEL_INFO(dev)->gen >= 4)
 349                                 pfit_control |= PFIT_SCALING_AUTO;
 350                         else
 351                                 pfit_control |= (VERT_AUTO_SCALE |
 352                                                  VERT_INTERP_BILINEAR |
 353                                                  HORIZ_AUTO_SCALE |
 354                                                  HORIZ_INTERP_BILINEAR);
 355                 }
 356                 break;
 357         default:
 358                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 359                 return;
 360         }
 361
 362         /* 965+ wants fuzzy fitting */
 363         /* FIXME: handle multiple panels by failing gracefully */
 364         if (INTEL_INFO(dev)->gen >= 4)
 365                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 366                                  PFIT_FILTER_FUZZY);
 367
 368 out:
 369         if ((pfit_control & PFIT_ENABLE) == 0) {
 370                 pfit_control = 0;
 371                 pfit_pgm_ratios = 0;
 372         }
 373
 374         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 375         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
 376                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 377
 378         pipe_config->gmch_pfit.control = pfit_control;
 379         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 380         pipe_config->gmch_pfit.lvds_border_bits = border;
 381 }
 382
 383 enum drm_connector_status
 384 intel_panel_detect(struct drm_device *dev)
 385 {
 386         struct drm_i915_private *dev_priv = dev->dev_private;
 387
 388         /* Assume that the BIOS does not lie through the OpRegion... */
 389         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
 390                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 391                         connector_status_connected :
 392                         connector_status_disconnected;
 393         }
 394
 395         switch (i915.panel_ignore_lid) {
 396         case -2:
 397                 return connector_status_connected;
 398         case -1:
 399                 return connector_status_disconnected;
 400         default:
 401                 return connector_status_unknown;
 402         }
 403 }
 404
 405 /**
 406  * scale - scale values from one range to another
 407  *
 408  * @source_val: value in range [@source_min..@source_max]
 409  *
 410  * Return @source_val in range [@source_min..@source_max] scaled to range
 411  * [@target_min..@target_max].
 412  */
 413 static uint32_t scale(uint32_t source_val,
 414                       uint32_t source_min, uint32_t source_max,
 415                       uint32_t target_min, uint32_t target_max)
 416 {
 417         uint64_t target_val;
 418
 419         WARN_ON(source_min > source_max);
 420         WARN_ON(target_min > target_max);
 421
 422         /* defensive */
 423         source_val = clamp(source_val, source_min, source_max);
 424
 425         /* avoid overflows */
 426         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
 427                         (target_max - target_min), source_max - source_min);
 428         target_val += target_min;
 429
 430         return target_val;
 431 }
 432
 433 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 434 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 435                                    u32 user_level, u32 user_max)
 436 {
 437         struct intel_panel *panel = &connector->panel;
 438
 439         return scale(user_level, 0, user_max,
 440                      panel->backlight.min, panel->backlight.max);
 441 }
 442
 443 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 444  * to [hw_min..hw_max]. */
 445 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 446                                    u32 user_level, u32 user_max)
 447 {
 448         struct intel_panel *panel = &connector->panel;
 449         u32 hw_level;
 450
 451         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 452         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 453
 454         return hw_level;
 455 }
 456
 457 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 458 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 459                                    u32 hw_level, u32 user_max)
 460 {
 461         struct intel_panel *panel = &connector->panel;
 462
 463         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 464                      0, user_max);
 465 }
 466
 467 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 468                                           u32 val)
 469 {
 470         struct drm_device *dev = connector->base.dev;
 471         struct drm_i915_private *dev_priv = dev->dev_private;
 472         struct intel_panel *panel = &connector->panel;
 473
 474         WARN_ON(panel->backlight.max == 0);
 475
 476         if (i915.invert_brightness < 0)
 477                 return val;
 478
 479         if (i915.invert_brightness > 0 ||
 480             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 481                 return panel->backlight.max - val;
 482         }
 483
 484         return val;
 485 }
 486
 487 static u32 bdw_get_backlight(struct intel_connector *connector)
 488 {
 489         struct drm_device *dev = connector->base.dev;
 490         struct drm_i915_private *dev_priv = dev->dev_private;
 491
 492         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 493 }
 494
 495 static u32 pch_get_backlight(struct intel_connector *connector)
 496 {
 497         struct drm_device *dev = connector->base.dev;
 498         struct drm_i915_private *dev_priv = dev->dev_private;
 499
 500         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 501 }
 502
 503 static u32 i9xx_get_backlight(struct intel_connector *connector)
 504 {
 505         struct drm_device *dev = connector->base.dev;
 506         struct drm_i915_private *dev_priv = dev->dev_private;
 507         struct intel_panel *panel = &connector->panel;
 508         u32 val;
 509
 510         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 511         if (INTEL_INFO(dev)->gen < 4)
 512                 val >>= 1;
 513
 514         if (panel->backlight.combination_mode) {
 515                 u8 lbpc;
 516
 517                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 518                 val *= lbpc;
 519         }
 520
 521         return val;
 522 }
 523
 524 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 525 {
 526         struct drm_i915_private *dev_priv = dev->dev_private;
 527
 528         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 529                 return 0;
 530
 531         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 532 }
 533
 534 static u32 vlv_get_backlight(struct intel_connector *connector)
 535 {
 536         struct drm_device *dev = connector->base.dev;
 537         enum pipe pipe = intel_get_pipe_from_connector(connector);
 538
 539         return _vlv_get_backlight(dev, pipe);
 540 }
 541
 542 static u32 bxt_get_backlight(struct intel_connector *connector)
 543 {
 544         struct drm_device *dev = connector->base.dev;
 545         struct drm_i915_private *dev_priv = dev->dev_private;
 546
 547         return I915_READ(BXT_BLC_PWM_DUTY1);
 548 }
 549
 550 static u32 pwm_get_backlight(struct intel_connector *connector)
 551 {
 552         struct intel_panel *panel = &connector->panel;
 553         int duty_ns;
 554
 555         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 556         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 557 }
 558
 559 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 560 {
 561         struct drm_device *dev = connector->base.dev;
 562         struct drm_i915_private *dev_priv = dev->dev_private;
 563         struct intel_panel *panel = &connector->panel;
 564         u32 val = 0;
 565
 566         mutex_lock(&dev_priv->backlight_lock);
 567
 568         if (panel->backlight.enabled) {
 569                 val = dev_priv->display.get_backlight(connector);
 570                 val = intel_panel_compute_brightness(connector, val);
 571         }
 572
 573         mutex_unlock(&dev_priv->backlight_lock);
 574
 575         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 576         return val;
 577 }
 578
 579 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
 580 {
 581         struct drm_device *dev = connector->base.dev;
 582         struct drm_i915_private *dev_priv = dev->dev_private;
 583         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 584         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 585 }
 586
 587 static void pch_set_backlight(struct intel_connector *connector, u32 level)
 588 {
 589         struct drm_device *dev = connector->base.dev;
 590         struct drm_i915_private *dev_priv = dev->dev_private;
 591         u32 tmp;
 592
 593         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 594         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 595 }
 596
 597 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 598 {
 599         struct drm_device *dev = connector->base.dev;
 600         struct drm_i915_private *dev_priv = dev->dev_private;
 601         struct intel_panel *panel = &connector->panel;
 602         u32 tmp, mask;
 603
 604         WARN_ON(panel->backlight.max == 0);
 605
 606         if (panel->backlight.combination_mode) {
 607                 u8 lbpc;
 608
 609                 lbpc = level * 0xfe / panel->backlight.max + 1;
 610                 level /= lbpc;
 611                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 612         }
 613
 614         if (IS_GEN4(dev)) {
 615                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 616         } else {
 617                 level <<= 1;
 618                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 619         }
 620
 621         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 622         I915_WRITE(BLC_PWM_CTL, tmp | level);
 623 }
 624
 625 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
 626 {
 627         struct drm_device *dev = connector->base.dev;
 628         struct drm_i915_private *dev_priv = dev->dev_private;
 629         enum pipe pipe = intel_get_pipe_from_connector(connector);
 630         u32 tmp;
 631
 632         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 633                 return;
 634
 635         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 636         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 637 }
 638
 639 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
 640 {
 641         struct drm_device *dev = connector->base.dev;
 642         struct drm_i915_private *dev_priv = dev->dev_private;
 643
 644         I915_WRITE(BXT_BLC_PWM_DUTY1, level);
 645 }
 646
 647 static void pwm_set_backlight(struct intel_connector *connector, u32 level)
 648 {
 649         struct intel_panel *panel = &connector->panel;
 650         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 651
 652         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 653 }
 654
 655 static void
 656 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 657 {
 658         struct drm_device *dev = connector->base.dev;
 659         struct drm_i915_private *dev_priv = dev->dev_private;
 660
 661         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 662
 663         level = intel_panel_compute_brightness(connector, level);
 664         dev_priv->display.set_backlight(connector, level);
 665 }
 666
 667 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 668 static void intel_panel_set_backlight(struct intel_connector *connector,
 669                                       u32 user_level, u32 user_max)
 670 {
 671         struct drm_device *dev = connector->base.dev;
 672         struct drm_i915_private *dev_priv = dev->dev_private;
 673         struct intel_panel *panel = &connector->panel;
 674         u32 hw_level;
 675
 676         if (!panel->backlight.present)
 677                 return;
 678
 679         mutex_lock(&dev_priv->backlight_lock);
 680
 681         WARN_ON(panel->backlight.max == 0);
 682
 683         hw_level = scale_user_to_hw(connector, user_level, user_max);
 684         panel->backlight.level = hw_level;
 685
 686         if (panel->backlight.enabled)
 687                 intel_panel_actually_set_backlight(connector, hw_level);
 688
 689         mutex_unlock(&dev_priv->backlight_lock);
 690 }
 691
 692 /* set backlight brightness to level in range [0..max], assuming hw min is
 693  * respected.
 694  */
 695 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
 696                                     u32 user_level, u32 user_max)
 697 {
 698         struct drm_device *dev = connector->base.dev;
 699         struct drm_i915_private *dev_priv = dev->dev_private;
 700         struct intel_panel *panel = &connector->panel;
 701         enum pipe pipe = intel_get_pipe_from_connector(connector);
 702         u32 hw_level;
 703
 704         /*
 705          * INVALID_PIPE may occur during driver init because
 706          * connection_mutex isn't held across the entire backlight
 707          * setup + modeset readout, and the BIOS can issue the
 708          * requests at any time.
 709          */
 710         if (!panel->backlight.present || pipe == INVALID_PIPE)
 711                 return;
 712
 713         mutex_lock(&dev_priv->backlight_lock);
 714
 715         WARN_ON(panel->backlight.max == 0);
 716
 717         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 718         panel->backlight.level = hw_level;
 719
 720         if (panel->backlight.device)
 721                 panel->backlight.device->props.brightness =
 722                         scale_hw_to_user(connector,
 723                                          panel->backlight.level,
 724                                          panel->backlight.device->props.max_brightness);
 725
 726         if (panel->backlight.enabled)
 727                 intel_panel_actually_set_backlight(connector, hw_level);
 728
 729         mutex_unlock(&dev_priv->backlight_lock);
 730 }
 731
 732 static void pch_disable_backlight(struct intel_connector *connector)
 733 {
 734         struct drm_device *dev = connector->base.dev;
 735         struct drm_i915_private *dev_priv = dev->dev_private;
 736         u32 tmp;
 737
 738         intel_panel_actually_set_backlight(connector, 0);
 739
 740         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 741         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 742
 743         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 744         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 745 }
 746
 747 static void i9xx_disable_backlight(struct intel_connector *connector)
 748 {
 749         intel_panel_actually_set_backlight(connector, 0);
 750 }
 751
 752 static void i965_disable_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         u32 tmp;
 757
 758         intel_panel_actually_set_backlight(connector, 0);
 759
 760         tmp = I915_READ(BLC_PWM_CTL2);
 761         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 762 }
 763
 764 static void vlv_disable_backlight(struct intel_connector *connector)
 765 {
 766         struct drm_device *dev = connector->base.dev;
 767         struct drm_i915_private *dev_priv = dev->dev_private;
 768         enum pipe pipe = intel_get_pipe_from_connector(connector);
 769         u32 tmp;
 770
 771         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 772                 return;
 773
 774         intel_panel_actually_set_backlight(connector, 0);
 775
 776         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 777         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 778 }
 779
 780 static void bxt_disable_backlight(struct intel_connector *connector)
 781 {
 782         struct drm_device *dev = connector->base.dev;
 783         struct drm_i915_private *dev_priv = dev->dev_private;
 784         u32 tmp;
 785
 786         intel_panel_actually_set_backlight(connector, 0);
 787
 788         tmp = I915_READ(BXT_BLC_PWM_CTL1);
 789         I915_WRITE(BXT_BLC_PWM_CTL1, tmp & ~BXT_BLC_PWM_ENABLE);
 790 }
 791
 792 static void pwm_disable_backlight(struct intel_connector *connector)
 793 {
 794         struct intel_panel *panel = &connector->panel;
 795
 796         /* Disable the backlight */
 797         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
 798         usleep_range(2000, 3000);
 799         pwm_disable(panel->backlight.pwm);
 800 }
 801
 802 void intel_panel_disable_backlight(struct intel_connector *connector)
 803 {
 804         struct drm_device *dev = connector->base.dev;
 805         struct drm_i915_private *dev_priv = dev->dev_private;
 806         struct intel_panel *panel = &connector->panel;
 807
 808         if (!panel->backlight.present)
 809                 return;
 810
 811         /*
 812          * Do not disable backlight on the vgaswitcheroo path. When switching
 813          * away from i915, the other client may depend on i915 to handle the
 814          * backlight. This will leave the backlight on unnecessarily when
 815          * another client is not activated.
 816          */
 817         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 818                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 819                 return;
 820         }
 821
 822         mutex_lock(&dev_priv->backlight_lock);
 823
 824         if (panel->backlight.device)
 825                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 826         panel->backlight.enabled = false;
 827         dev_priv->display.disable_backlight(connector);
 828
 829         mutex_unlock(&dev_priv->backlight_lock);
 830 }
 831
 832 static void bdw_enable_backlight(struct intel_connector *connector)
 833 {
 834         struct drm_device *dev = connector->base.dev;
 835         struct drm_i915_private *dev_priv = dev->dev_private;
 836         struct intel_panel *panel = &connector->panel;
 837         u32 pch_ctl1, pch_ctl2;
 838
 839         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 840         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 841                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 842                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 843                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 844         }
 845
 846         pch_ctl2 = panel->backlight.max << 16;
 847         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 848
 849         pch_ctl1 = 0;
 850         if (panel->backlight.active_low_pwm)
 851                 pch_ctl1 |= BLM_PCH_POLARITY;
 852
 853         /* After LPT, override is the default. */
 854         if (HAS_PCH_LPT(dev_priv))
 855                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 856
 857         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 858         POSTING_READ(BLC_PWM_PCH_CTL1);
 859         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 860
 861         /* This won't stick until the above enable. */
 862         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 863 }
 864
 865 static void pch_enable_backlight(struct intel_connector *connector)
 866 {
 867         struct drm_device *dev = connector->base.dev;
 868         struct drm_i915_private *dev_priv = dev->dev_private;
 869         struct intel_panel *panel = &connector->panel;
 870         enum pipe pipe = intel_get_pipe_from_connector(connector);
 871         enum transcoder cpu_transcoder =
 872                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 873         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 874
 875         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 876         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 877                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 878                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 879                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 880         }
 881
 882         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 883         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 884                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 885                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 886                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 887         }
 888
 889         if (cpu_transcoder == TRANSCODER_EDP)
 890                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 891         else
 892                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 893         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 894         POSTING_READ(BLC_PWM_CPU_CTL2);
 895         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 896
 897         /* This won't stick until the above enable. */
 898         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 899
 900         pch_ctl2 = panel->backlight.max << 16;
 901         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 902
 903         pch_ctl1 = 0;
 904         if (panel->backlight.active_low_pwm)
 905                 pch_ctl1 |= BLM_PCH_POLARITY;
 906
 907         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 908         POSTING_READ(BLC_PWM_PCH_CTL1);
 909         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 910 }
 911
 912 static void i9xx_enable_backlight(struct intel_connector *connector)
 913 {
 914         struct drm_device *dev = connector->base.dev;
 915         struct drm_i915_private *dev_priv = dev->dev_private;
 916         struct intel_panel *panel = &connector->panel;
 917         u32 ctl, freq;
 918
 919         ctl = I915_READ(BLC_PWM_CTL);
 920         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 921                 DRM_DEBUG_KMS("backlight already enabled\n");
 922                 I915_WRITE(BLC_PWM_CTL, 0);
 923         }
 924
 925         freq = panel->backlight.max;
 926         if (panel->backlight.combination_mode)
 927                 freq /= 0xff;
 928
 929         ctl = freq << 17;
 930         if (panel->backlight.combination_mode)
 931                 ctl |= BLM_LEGACY_MODE;
 932         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
 933                 ctl |= BLM_POLARITY_PNV;
 934
 935         I915_WRITE(BLC_PWM_CTL, ctl);
 936         POSTING_READ(BLC_PWM_CTL);
 937
 938         /* XXX: combine this into above write? */
 939         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 940
 941         /*
 942          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 943          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 944          * that has backlight.
 945          */
 946         if (IS_GEN2(dev))
 947                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 948 }
 949
 950 static void i965_enable_backlight(struct intel_connector *connector)
 951 {
 952         struct drm_device *dev = connector->base.dev;
 953         struct drm_i915_private *dev_priv = dev->dev_private;
 954         struct intel_panel *panel = &connector->panel;
 955         enum pipe pipe = intel_get_pipe_from_connector(connector);
 956         u32 ctl, ctl2, freq;
 957
 958         ctl2 = I915_READ(BLC_PWM_CTL2);
 959         if (ctl2 & BLM_PWM_ENABLE) {
 960                 DRM_DEBUG_KMS("backlight already enabled\n");
 961                 ctl2 &= ~BLM_PWM_ENABLE;
 962                 I915_WRITE(BLC_PWM_CTL2, ctl2);
 963         }
 964
 965         freq = panel->backlight.max;
 966         if (panel->backlight.combination_mode)
 967                 freq /= 0xff;
 968
 969         ctl = freq << 16;
 970         I915_WRITE(BLC_PWM_CTL, ctl);
 971
 972         ctl2 = BLM_PIPE(pipe);
 973         if (panel->backlight.combination_mode)
 974                 ctl2 |= BLM_COMBINATION_MODE;
 975         if (panel->backlight.active_low_pwm)
 976                 ctl2 |= BLM_POLARITY_I965;
 977         I915_WRITE(BLC_PWM_CTL2, ctl2);
 978         POSTING_READ(BLC_PWM_CTL2);
 979         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 980
 981         intel_panel_actually_set_backlight(connector, panel->backlight.level);
 982 }
 983
 984 static void vlv_enable_backlight(struct intel_connector *connector)
 985 {
 986         struct drm_device *dev = connector->base.dev;
 987         struct drm_i915_private *dev_priv = dev->dev_private;
 988         struct intel_panel *panel = &connector->panel;
 989         enum pipe pipe = intel_get_pipe_from_connector(connector);
 990         u32 ctl, ctl2;
 991
 992         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 993                 return;
 994
 995         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 996         if (ctl2 & BLM_PWM_ENABLE) {
 997                 DRM_DEBUG_KMS("backlight already enabled\n");
 998                 ctl2 &= ~BLM_PWM_ENABLE;
 999                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1000         }
1001
1002         ctl = panel->backlight.max << 16;
1003         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1004
1005         /* XXX: combine this into above write? */
1006         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1007
1008         ctl2 = 0;
1009         if (panel->backlight.active_low_pwm)
1010                 ctl2 |= BLM_POLARITY_I965;
1011         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1012         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1013         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1014 }
1015
1016 static void bxt_enable_backlight(struct intel_connector *connector)
1017 {
1018         struct drm_device *dev = connector->base.dev;
1019         struct drm_i915_private *dev_priv = dev->dev_private;
1020         struct intel_panel *panel = &connector->panel;
1021         u32 pwm_ctl;
1022
1023         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1024         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1025                 DRM_DEBUG_KMS("backlight already enabled\n");
1026                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1027                 I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1028         }
1029
1030         I915_WRITE(BXT_BLC_PWM_FREQ1, panel->backlight.max);
1031
1032         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1033
1034         pwm_ctl = 0;
1035         if (panel->backlight.active_low_pwm)
1036                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1037
1038         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1039         POSTING_READ(BXT_BLC_PWM_CTL1);
1040         I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl | BXT_BLC_PWM_ENABLE);
1041 }
1042
1043 static void pwm_enable_backlight(struct intel_connector *connector)
1044 {
1045         struct intel_panel *panel = &connector->panel;
1046
1047         pwm_enable(panel->backlight.pwm);
1048         intel_panel_actually_set_backlight(connector, panel->backlight.level);
1049 }
1050
1051 void intel_panel_enable_backlight(struct intel_connector *connector)
1052 {
1053         struct drm_device *dev = connector->base.dev;
1054         struct drm_i915_private *dev_priv = dev->dev_private;
1055         struct intel_panel *panel = &connector->panel;
1056         enum pipe pipe = intel_get_pipe_from_connector(connector);
1057
1058         if (!panel->backlight.present)
1059                 return;
1060
1061         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1062
1063         mutex_lock(&dev_priv->backlight_lock);
1064
1065         WARN_ON(panel->backlight.max == 0);
1066
1067         if (panel->backlight.level <= panel->backlight.min) {
1068                 panel->backlight.level = panel->backlight.max;
1069                 if (panel->backlight.device)
1070                         panel->backlight.device->props.brightness =
1071                                 scale_hw_to_user(connector,
1072                                                  panel->backlight.level,
1073                                                  panel->backlight.device->props.max_brightness);
1074         }
1075
1076         dev_priv->display.enable_backlight(connector);
1077         panel->backlight.enabled = true;
1078         if (panel->backlight.device)
1079                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1080
1081         mutex_unlock(&dev_priv->backlight_lock);
1082 }
1083
1084 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1085 static int intel_backlight_device_update_status(struct backlight_device *bd)
1086 {
1087         struct intel_connector *connector = bl_get_data(bd);
1088         struct intel_panel *panel = &connector->panel;
1089         struct drm_device *dev = connector->base.dev;
1090
1091         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1092         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1093                       bd->props.brightness, bd->props.max_brightness);
1094         intel_panel_set_backlight(connector, bd->props.brightness,
1095                                   bd->props.max_brightness);
1096
1097         /*
1098          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1099          * backlight class device does not make it easy to to differentiate
1100          * between callbacks for brightness and bl_power, so our backlight_power
1101          * callback needs to take this into account.
1102          */
1103         if (panel->backlight.enabled) {
1104                 if (panel->backlight_power) {
1105                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1106                                 bd->props.brightness != 0;
1107                         panel->backlight_power(connector, enable);
1108                 }
1109         } else {
1110                 bd->props.power = FB_BLANK_POWERDOWN;
1111         }
1112
1113         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1114         return 0;
1115 }
1116
1117 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1118 {
1119         struct intel_connector *connector = bl_get_data(bd);
1120         struct drm_device *dev = connector->base.dev;
1121         struct drm_i915_private *dev_priv = dev->dev_private;
1122         u32 hw_level;
1123         int ret;
1124
1125         intel_runtime_pm_get(dev_priv);
1126         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1127
1128         hw_level = intel_panel_get_backlight(connector);
1129         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1130
1131         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1132         intel_runtime_pm_put(dev_priv);
1133
1134         return ret;
1135 }
1136
1137 static const struct backlight_ops intel_backlight_device_ops = {
1138         .update_status = intel_backlight_device_update_status,
1139         .get_brightness = intel_backlight_device_get_brightness,
1140 };
1141
1142 static int intel_backlight_device_register(struct intel_connector *connector)
1143 {
1144         struct intel_panel *panel = &connector->panel;
1145         struct backlight_properties props;
1146
1147         if (WARN_ON(panel->backlight.device))
1148                 return -ENODEV;
1149
1150         if (!panel->backlight.present)
1151                 return 0;
1152
1153         WARN_ON(panel->backlight.max == 0);
1154
1155         memset(&props, 0, sizeof(props));
1156         props.type = BACKLIGHT_RAW;
1157
1158         /*
1159          * Note: Everything should work even if the backlight device max
1160          * presented to the userspace is arbitrarily chosen.
1161          */
1162         props.max_brightness = panel->backlight.max;
1163         props.brightness = scale_hw_to_user(connector,
1164                                             panel->backlight.level,
1165                                             props.max_brightness);
1166
1167         if (panel->backlight.enabled)
1168                 props.power = FB_BLANK_UNBLANK;
1169         else
1170                 props.power = FB_BLANK_POWERDOWN;
1171
1172         /*
1173          * Note: using the same name independent of the connector prevents
1174          * registration of multiple backlight devices in the driver.
1175          */
1176         panel->backlight.device =
1177                 backlight_device_register("intel_backlight",
1178                                           connector->base.kdev,
1179                                           connector,
1180                                           &intel_backlight_device_ops, &props);
1181
1182         if (IS_ERR(panel->backlight.device)) {
1183                 DRM_ERROR("Failed to register backlight: %ld\n",
1184                           PTR_ERR(panel->backlight.device));
1185                 panel->backlight.device = NULL;
1186                 return -ENODEV;
1187         }
1188
1189         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1190                       connector->base.name);
1191
1192         return 0;
1193 }
1194
1195 static void intel_backlight_device_unregister(struct intel_connector *connector)
1196 {
1197         struct intel_panel *panel = &connector->panel;
1198
1199         if (panel->backlight.device) {
1200                 backlight_device_unregister(panel->backlight.device);
1201                 panel->backlight.device = NULL;
1202         }
1203 }
1204 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1205 static int intel_backlight_device_register(struct intel_connector *connector)
1206 {
1207         return 0;
1208 }
1209 static void intel_backlight_device_unregister(struct intel_connector *connector)
1210 {
1211 }
1212 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1213
1214 /*
1215  * Note: The setup hooks can't assume pipe is set!
1216  *
1217  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1218  * appropriately when it's 0. Use VBT and/or sane defaults.
1219  */
1220 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1221 {
1222         struct drm_device *dev = connector->base.dev;
1223         struct drm_i915_private *dev_priv = dev->dev_private;
1224         struct intel_panel *panel = &connector->panel;
1225         int min;
1226
1227         WARN_ON(panel->backlight.max == 0);
1228
1229         /*
1230          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1231          * to problems. There are such machines out there. Either our
1232          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1233          * against this by letting the minimum be at most (arbitrarily chosen)
1234          * 25% of the max.
1235          */
1236         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1237         if (min != dev_priv->vbt.backlight.min_brightness) {
1238                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1239                               dev_priv->vbt.backlight.min_brightness, min);
1240         }
1241
1242         /* vbt value is a coefficient in range [0..255] */
1243         return scale(min, 0, 255, 0, panel->backlight.max);
1244 }
1245
1246 static int bdw_setup_backlight(struct intel_connector *connector, enum pipe unused)
1247 {
1248         struct drm_device *dev = connector->base.dev;
1249         struct drm_i915_private *dev_priv = dev->dev_private;
1250         struct intel_panel *panel = &connector->panel;
1251         u32 pch_ctl1, pch_ctl2, val;
1252
1253         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1254         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1255
1256         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1257         panel->backlight.max = pch_ctl2 >> 16;
1258         if (!panel->backlight.max)
1259                 return -ENODEV;
1260
1261         panel->backlight.min = get_backlight_min_vbt(connector);
1262
1263         val = bdw_get_backlight(connector);
1264         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1265
1266         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1267                 panel->backlight.level != 0;
1268
1269         return 0;
1270 }
1271
1272 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1273 {
1274         struct drm_device *dev = connector->base.dev;
1275         struct drm_i915_private *dev_priv = dev->dev_private;
1276         struct intel_panel *panel = &connector->panel;
1277         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1278
1279         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1280         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1281
1282         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1283         panel->backlight.max = pch_ctl2 >> 16;
1284         if (!panel->backlight.max)
1285                 return -ENODEV;
1286
1287         panel->backlight.min = get_backlight_min_vbt(connector);
1288
1289         val = pch_get_backlight(connector);
1290         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1291
1292         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1293         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1294                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1295
1296         return 0;
1297 }
1298
1299 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1300 {
1301         struct drm_device *dev = connector->base.dev;
1302         struct drm_i915_private *dev_priv = dev->dev_private;
1303         struct intel_panel *panel = &connector->panel;
1304         u32 ctl, val;
1305
1306         ctl = I915_READ(BLC_PWM_CTL);
1307
1308         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1309                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1310
1311         if (IS_PINEVIEW(dev))
1312                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1313
1314         panel->backlight.max = ctl >> 17;
1315         if (panel->backlight.combination_mode)
1316                 panel->backlight.max *= 0xff;
1317
1318         if (!panel->backlight.max)
1319                 return -ENODEV;
1320
1321         panel->backlight.min = get_backlight_min_vbt(connector);
1322
1323         val = i9xx_get_backlight(connector);
1324         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1325
1326         panel->backlight.enabled = panel->backlight.level != 0;
1327
1328         return 0;
1329 }
1330
1331 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1332 {
1333         struct drm_device *dev = connector->base.dev;
1334         struct drm_i915_private *dev_priv = dev->dev_private;
1335         struct intel_panel *panel = &connector->panel;
1336         u32 ctl, ctl2, val;
1337
1338         ctl2 = I915_READ(BLC_PWM_CTL2);
1339         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1340         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1341
1342         ctl = I915_READ(BLC_PWM_CTL);
1343         panel->backlight.max = ctl >> 16;
1344         if (panel->backlight.combination_mode)
1345                 panel->backlight.max *= 0xff;
1346
1347         if (!panel->backlight.max)
1348                 return -ENODEV;
1349
1350         panel->backlight.min = get_backlight_min_vbt(connector);
1351
1352         val = i9xx_get_backlight(connector);
1353         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1354
1355         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1356                 panel->backlight.level != 0;
1357
1358         return 0;
1359 }
1360
1361 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1362 {
1363         struct drm_device *dev = connector->base.dev;
1364         struct drm_i915_private *dev_priv = dev->dev_private;
1365         struct intel_panel *panel = &connector->panel;
1366         enum pipe p;
1367         u32 ctl, ctl2, val;
1368
1369         for_each_pipe(dev_priv, p) {
1370                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1371
1372                 /* Skip if the modulation freq is already set */
1373                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1374                         continue;
1375
1376                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1377                 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1378                            cur_val);
1379         }
1380
1381         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1382                 return -ENODEV;
1383
1384         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1385         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1386
1387         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1388         panel->backlight.max = ctl >> 16;
1389         if (!panel->backlight.max)
1390                 return -ENODEV;
1391
1392         panel->backlight.min = get_backlight_min_vbt(connector);
1393
1394         val = _vlv_get_backlight(dev, pipe);
1395         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1396
1397         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1398                 panel->backlight.level != 0;
1399
1400         return 0;
1401 }
1402
1403 static int
1404 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1405 {
1406         struct drm_device *dev = connector->base.dev;
1407         struct drm_i915_private *dev_priv = dev->dev_private;
1408         struct intel_panel *panel = &connector->panel;
1409         u32 pwm_ctl, val;
1410
1411         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1412         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1413
1414         panel->backlight.max = I915_READ(BXT_BLC_PWM_FREQ1);
1415         if (!panel->backlight.max)
1416                 return -ENODEV;
1417
1418         val = bxt_get_backlight(connector);
1419         panel->backlight.level = intel_panel_compute_brightness(connector, val);
1420
1421         panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1422                 panel->backlight.level != 0;
1423
1424         return 0;
1425 }
1426
1427 static int pwm_setup_backlight(struct intel_connector *connector,
1428                                enum pipe pipe)
1429 {
1430         struct drm_device *dev = connector->base.dev;
1431         struct intel_panel *panel = &connector->panel;
1432         int retval;
1433
1434         /* Get the PWM chip for backlight control */
1435         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1436         if (IS_ERR(panel->backlight.pwm)) {
1437                 DRM_ERROR("Failed to own the pwm chip\n");
1438                 panel->backlight.pwm = NULL;
1439                 return -ENODEV;
1440         }
1441
1442         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1443                             CRC_PMIC_PWM_PERIOD_NS);
1444         if (retval < 0) {
1445                 DRM_ERROR("Failed to configure the pwm chip\n");
1446                 pwm_put(panel->backlight.pwm);
1447                 panel->backlight.pwm = NULL;
1448                 return retval;
1449         }
1450
1451         panel->backlight.min = 0; /* 0% */
1452         panel->backlight.max = 100; /* 100% */
1453         panel->backlight.level = DIV_ROUND_UP(
1454                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1455                                  CRC_PMIC_PWM_PERIOD_NS);
1456         panel->backlight.enabled = panel->backlight.level != 0;
1457
1458         return 0;
1459 }
1460
1461 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1462 {
1463         struct drm_device *dev = connector->dev;
1464         struct drm_i915_private *dev_priv = dev->dev_private;
1465         struct intel_connector *intel_connector = to_intel_connector(connector);
1466         struct intel_panel *panel = &intel_connector->panel;
1467         int ret;
1468
1469         if (!dev_priv->vbt.backlight.present) {
1470                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1471                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1472                 } else {
1473                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1474                         return 0;
1475                 }
1476         }
1477
1478         /* set level and max in panel struct */
1479         mutex_lock(&dev_priv->backlight_lock);
1480         ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1481         mutex_unlock(&dev_priv->backlight_lock);
1482
1483         if (ret) {
1484                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1485                               connector->name);
1486                 return ret;
1487         }
1488
1489         panel->backlight.present = true;
1490
1491         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1492                       connector->name,
1493                       panel->backlight.enabled ? "enabled" : "disabled",
1494                       panel->backlight.level, panel->backlight.max);
1495
1496         return 0;
1497 }
1498
1499 void intel_panel_destroy_backlight(struct drm_connector *connector)
1500 {
1501         struct intel_connector *intel_connector = to_intel_connector(connector);
1502         struct intel_panel *panel = &intel_connector->panel;
1503
1504         /* dispose of the pwm */
1505         if (panel->backlight.pwm)
1506                 pwm_put(panel->backlight.pwm);
1507
1508         panel->backlight.present = false;
1509 }
1510
1511 /* Set up chip specific backlight functions */
1512 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1513 {
1514         struct drm_i915_private *dev_priv = dev->dev_private;
1515
1516         if (IS_BROXTON(dev)) {
1517                 dev_priv->display.setup_backlight = bxt_setup_backlight;
1518                 dev_priv->display.enable_backlight = bxt_enable_backlight;
1519                 dev_priv->display.disable_backlight = bxt_disable_backlight;
1520                 dev_priv->display.set_backlight = bxt_set_backlight;
1521                 dev_priv->display.get_backlight = bxt_get_backlight;
1522         } else if (IS_BROADWELL(dev) || IS_SKYLAKE(dev)) {
1523                 dev_priv->display.setup_backlight = bdw_setup_backlight;
1524                 dev_priv->display.enable_backlight = bdw_enable_backlight;
1525                 dev_priv->display.disable_backlight = pch_disable_backlight;
1526                 dev_priv->display.set_backlight = bdw_set_backlight;
1527                 dev_priv->display.get_backlight = bdw_get_backlight;
1528         } else if (HAS_PCH_SPLIT(dev)) {
1529                 dev_priv->display.setup_backlight = pch_setup_backlight;
1530                 dev_priv->display.enable_backlight = pch_enable_backlight;
1531                 dev_priv->display.disable_backlight = pch_disable_backlight;
1532                 dev_priv->display.set_backlight = pch_set_backlight;
1533                 dev_priv->display.get_backlight = pch_get_backlight;
1534         } else if (IS_VALLEYVIEW(dev)) {
1535                 if (dev_priv->vbt.has_mipi) {
1536                         dev_priv->display.setup_backlight = pwm_setup_backlight;
1537                         dev_priv->display.enable_backlight = pwm_enable_backlight;
1538                         dev_priv->display.disable_backlight = pwm_disable_backlight;
1539                         dev_priv->display.set_backlight = pwm_set_backlight;
1540                         dev_priv->display.get_backlight = pwm_get_backlight;
1541                 } else {
1542                         dev_priv->display.setup_backlight = vlv_setup_backlight;
1543                         dev_priv->display.enable_backlight = vlv_enable_backlight;
1544                         dev_priv->display.disable_backlight = vlv_disable_backlight;
1545                         dev_priv->display.set_backlight = vlv_set_backlight;
1546                         dev_priv->display.get_backlight = vlv_get_backlight;
1547                 }
1548         } else if (IS_GEN4(dev)) {
1549                 dev_priv->display.setup_backlight = i965_setup_backlight;
1550                 dev_priv->display.enable_backlight = i965_enable_backlight;
1551                 dev_priv->display.disable_backlight = i965_disable_backlight;
1552                 dev_priv->display.set_backlight = i9xx_set_backlight;
1553                 dev_priv->display.get_backlight = i9xx_get_backlight;
1554         } else {
1555                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1556                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1557                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1558                 dev_priv->display.set_backlight = i9xx_set_backlight;
1559                 dev_priv->display.get_backlight = i9xx_get_backlight;
1560         }
1561 }
1562
1563 int intel_panel_init(struct intel_panel *panel,
1564                      struct drm_display_mode *fixed_mode,
1565                      struct drm_display_mode *downclock_mode)
1566 {
1567         panel->fixed_mode = fixed_mode;
1568         panel->downclock_mode = downclock_mode;
1569
1570         return 0;
1571 }
1572
1573 void intel_panel_fini(struct intel_panel *panel)
1574 {
1575         struct intel_connector *intel_connector =
1576                 container_of(panel, struct intel_connector, panel);
1577
1578         if (panel->fixed_mode)
1579                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1580
1581         if (panel->downclock_mode)
1582                 drm_mode_destroy(intel_connector->base.dev,
1583                                 panel->downclock_mode);
1584 }
1585
1586 void intel_backlight_register(struct drm_device *dev)
1587 {
1588         struct intel_connector *connector;
1589
1590         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1591                 intel_backlight_device_register(connector);
1592 }
1593
1594 void intel_backlight_unregister(struct drm_device *dev)
1595 {
1596         struct intel_connector *connector;
1597
1598         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1599                 intel_backlight_device_unregister(connector);
1600 }