drivers/gpu/drm/i915/display/intel

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This source file includes following definitions.
intel_fixed_panel_mode
is_downclock_mode
intel_panel_edid_downclock_mode
intel_panel_edid_fixed_mode
intel_panel_vbt_fixed_mode
intel_pch_panel_fitting
centre_horizontally
centre_vertically
panel_fitter_scaling
i965_scale_aspect
i9xx_scale_aspect
intel_gmch_panel_fitting
scale
scale_user_to_hw
clamp_user_to_hw
scale_hw_to_user
intel_panel_compute_brightness
lpt_get_backlight
pch_get_backlight
i9xx_get_backlight
_vlv_get_backlight
vlv_get_backlight
bxt_get_backlight
pwm_get_backlight
lpt_set_backlight
pch_set_backlight
i9xx_set_backlight
vlv_set_backlight
bxt_set_backlight
pwm_set_backlight
intel_panel_actually_set_backlight
intel_panel_set_backlight_acpi
lpt_disable_backlight
pch_disable_backlight
i9xx_disable_backlight
i965_disable_backlight
vlv_disable_backlight
bxt_disable_backlight
cnp_disable_backlight
pwm_disable_backlight
intel_panel_disable_backlight
lpt_enable_backlight
pch_enable_backlight
i9xx_enable_backlight
i965_enable_backlight
vlv_enable_backlight
bxt_enable_backlight
cnp_enable_backlight
pwm_enable_backlight
__intel_panel_enable_backlight
intel_panel_enable_backlight
intel_panel_get_backlight
intel_panel_set_backlight
intel_backlight_device_update_status
intel_backlight_device_get_brightness
intel_backlight_device_register
intel_backlight_device_unregister
cnp_hz_to_pwm
bxt_hz_to_pwm
spt_hz_to_pwm
lpt_hz_to_pwm
pch_hz_to_pwm
i9xx_hz_to_pwm
i965_hz_to_pwm
vlv_hz_to_pwm
get_backlight_max_vbt
get_backlight_min_vbt
lpt_setup_backlight
pch_setup_backlight
i9xx_setup_backlight
i965_setup_backlight
vlv_setup_backlight
bxt_setup_backlight
cnp_setup_backlight
pwm_setup_backlight
intel_panel_update_backlight
intel_panel_setup_backlight
intel_panel_destroy_backlight
intel_panel_init_backlight_funcs
intel_panel_init
intel_panel_fini
   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 
  37 #include "intel_connector.h"
  38 #include "intel_display_types.h"
  39 #include "intel_dp_aux_backlight.h"
  40 #include "intel_dsi_dcs_backlight.h"
  41 #include "intel_panel.h"
  42 
  43 #define CRC_PMIC_PWM_PERIOD_NS  21333
  44 
  45 void
  46 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  47                        struct drm_display_mode *adjusted_mode)
  48 {
  49         drm_mode_copy(adjusted_mode, fixed_mode);
  50 
  51         drm_mode_set_crtcinfo(adjusted_mode, 0);
  52 }
  53 
  54 static bool is_downclock_mode(const struct drm_display_mode *downclock_mode,
  55                               const struct drm_display_mode *fixed_mode)
  56 {
  57         return drm_mode_match(downclock_mode, fixed_mode,
  58                               DRM_MODE_MATCH_TIMINGS |
  59                               DRM_MODE_MATCH_FLAGS |
  60                               DRM_MODE_MATCH_3D_FLAGS) &&
  61                 downclock_mode->clock < fixed_mode->clock;
  62 }
  63 
  64 struct drm_display_mode *
  65 intel_panel_edid_downclock_mode(struct intel_connector *connector,
  66                                 const struct drm_display_mode *fixed_mode)
  67 {
  68         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
  69         const struct drm_display_mode *scan, *best_mode = NULL;
  70         struct drm_display_mode *downclock_mode;
  71         int best_clock = fixed_mode->clock;
  72 
  73         list_for_each_entry(scan, &connector->base.probed_modes, head) {
  74                 /*
  75                  * If one mode has the same resolution with the fixed_panel
  76                  * mode while they have the different refresh rate, it means
  77                  * that the reduced downclock is found. In such
  78                  * case we can set the different FPx0/1 to dynamically select
  79                  * between low and high frequency.
  80                  */
  81                 if (is_downclock_mode(scan, fixed_mode) &&
  82                     scan->clock < best_clock) {
  83                         /*
  84                          * The downclock is already found. But we
  85                          * expect to find the lower downclock.
  86                          */
  87                         best_clock = scan->clock;
  88                         best_mode = scan;
  89                 }
  90         }
  91 
  92         if (!best_mode)
  93                 return NULL;
  94 
  95         downclock_mode = drm_mode_duplicate(&dev_priv->drm, best_mode);
  96         if (!downclock_mode)
  97                 return NULL;
  98 
  99         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using downclock mode from EDID: ",
 100                       connector->base.base.id, connector->base.name);
 101         drm_mode_debug_printmodeline(downclock_mode);
 102 
 103         return downclock_mode;
 104 }
 105 
 106 struct drm_display_mode *
 107 intel_panel_edid_fixed_mode(struct intel_connector *connector)
 108 {
 109         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 110         const struct drm_display_mode *scan;
 111         struct drm_display_mode *fixed_mode;
 112 
 113         if (list_empty(&connector->base.probed_modes))
 114                 return NULL;
 115 
 116         /* prefer fixed mode from EDID if available */
 117         list_for_each_entry(scan, &connector->base.probed_modes, head) {
 118                 if ((scan->type & DRM_MODE_TYPE_PREFERRED) == 0)
 119                         continue;
 120 
 121                 fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
 122                 if (!fixed_mode)
 123                         return NULL;
 124 
 125                 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using preferred mode from EDID: ",
 126                               connector->base.base.id, connector->base.name);
 127                 drm_mode_debug_printmodeline(fixed_mode);
 128 
 129                 return fixed_mode;
 130         }
 131 
 132         scan = list_first_entry(&connector->base.probed_modes,
 133                                 typeof(*scan), head);
 134 
 135         fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
 136         if (!fixed_mode)
 137                 return NULL;
 138 
 139         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 140 
 141         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using first mode from EDID: ",
 142                       connector->base.base.id, connector->base.name);
 143         drm_mode_debug_printmodeline(fixed_mode);
 144 
 145         return fixed_mode;
 146 }
 147 
 148 struct drm_display_mode *
 149 intel_panel_vbt_fixed_mode(struct intel_connector *connector)
 150 {
 151         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 152         struct drm_display_info *info = &connector->base.display_info;
 153         struct drm_display_mode *fixed_mode;
 154 
 155         if (!dev_priv->vbt.lfp_lvds_vbt_mode)
 156                 return NULL;
 157 
 158         fixed_mode = drm_mode_duplicate(&dev_priv->drm,
 159                                         dev_priv->vbt.lfp_lvds_vbt_mode);
 160         if (!fixed_mode)
 161                 return NULL;
 162 
 163         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 164 
 165         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using mode from VBT: ",
 166                       connector->base.base.id, connector->base.name);
 167         drm_mode_debug_printmodeline(fixed_mode);
 168 
 169         info->width_mm = fixed_mode->width_mm;
 170         info->height_mm = fixed_mode->height_mm;
 171 
 172         return fixed_mode;
 173 }
 174 
 175 /* adjusted_mode has been preset to be the panel's fixed mode */
 176 void
 177 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 178                         struct intel_crtc_state *pipe_config,
 179                         int fitting_mode)
 180 {
 181         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 182         int x = 0, y = 0, width = 0, height = 0;
 183 
 184         /* Native modes don't need fitting */
 185         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 186             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
 187             pipe_config->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
 188                 goto done;
 189 
 190         switch (fitting_mode) {
 191         case DRM_MODE_SCALE_CENTER:
 192                 width = pipe_config->pipe_src_w;
 193                 height = pipe_config->pipe_src_h;
 194                 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 195                 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
 196                 break;
 197 
 198         case DRM_MODE_SCALE_ASPECT:
 199                 /* Scale but preserve the aspect ratio */
 200                 {
 201                         u32 scaled_width = adjusted_mode->crtc_hdisplay
 202                                 * pipe_config->pipe_src_h;
 203                         u32 scaled_height = pipe_config->pipe_src_w
 204                                 * adjusted_mode->crtc_vdisplay;
 205                         if (scaled_width > scaled_height) { /* pillar */
 206                                 width = scaled_height / pipe_config->pipe_src_h;
 207                                 if (width & 1)
 208                                         width++;
 209                                 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 210                                 y = 0;
 211                                 height = adjusted_mode->crtc_vdisplay;
 212                         } else if (scaled_width < scaled_height) { /* letter */
 213                                 height = scaled_width / pipe_config->pipe_src_w;
 214                                 if (height & 1)
 215                                     height++;
 216                                 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 217                                 x = 0;
 218                                 width = adjusted_mode->crtc_hdisplay;
 219                         } else {
 220                                 x = y = 0;
 221                                 width = adjusted_mode->crtc_hdisplay;
 222                                 height = adjusted_mode->crtc_vdisplay;
 223                         }
 224                 }
 225                 break;
 226 
 227         case DRM_MODE_SCALE_FULLSCREEN:
 228                 x = y = 0;
 229                 width = adjusted_mode->crtc_hdisplay;
 230                 height = adjusted_mode->crtc_vdisplay;
 231                 break;
 232 
 233         default:
 234                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 235                 return;
 236         }
 237 
 238 done:
 239         pipe_config->pch_pfit.pos = (x << 16) | y;
 240         pipe_config->pch_pfit.size = (width << 16) | height;
 241         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 242 }
 243 
 244 static void
 245 centre_horizontally(struct drm_display_mode *adjusted_mode,
 246                     int width)
 247 {
 248         u32 border, sync_pos, blank_width, sync_width;
 249 
 250         /* keep the hsync and hblank widths constant */
 251         sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
 252         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
 253         sync_pos = (blank_width - sync_width + 1) / 2;
 254 
 255         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
 256         border += border & 1; /* make the border even */
 257 
 258         adjusted_mode->crtc_hdisplay = width;
 259         adjusted_mode->crtc_hblank_start = width + border;
 260         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
 261 
 262         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
 263         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
 264 }
 265 
 266 static void
 267 centre_vertically(struct drm_display_mode *adjusted_mode,
 268                   int height)
 269 {
 270         u32 border, sync_pos, blank_width, sync_width;
 271 
 272         /* keep the vsync and vblank widths constant */
 273         sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
 274         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
 275         sync_pos = (blank_width - sync_width + 1) / 2;
 276 
 277         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
 278 
 279         adjusted_mode->crtc_vdisplay = height;
 280         adjusted_mode->crtc_vblank_start = height + border;
 281         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
 282 
 283         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
 284         adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
 285 }
 286 
 287 static inline u32 panel_fitter_scaling(u32 source, u32 target)
 288 {
 289         /*
 290          * Floating point operation is not supported. So the FACTOR
 291          * is defined, which can avoid the floating point computation
 292          * when calculating the panel ratio.
 293          */
 294 #define ACCURACY 12
 295 #define FACTOR (1 << ACCURACY)
 296         u32 ratio = source * FACTOR / target;
 297         return (FACTOR * ratio + FACTOR/2) / FACTOR;
 298 }
 299 
 300 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
 301                               u32 *pfit_control)
 302 {
 303         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 304         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 305                 pipe_config->pipe_src_h;
 306         u32 scaled_height = pipe_config->pipe_src_w *
 307                 adjusted_mode->crtc_vdisplay;
 308 
 309         /* 965+ is easy, it does everything in hw */
 310         if (scaled_width > scaled_height)
 311                 *pfit_control |= PFIT_ENABLE |
 312                         PFIT_SCALING_PILLAR;
 313         else if (scaled_width < scaled_height)
 314                 *pfit_control |= PFIT_ENABLE |
 315                         PFIT_SCALING_LETTER;
 316         else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
 317                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
 318 }
 319 
 320 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
 321                               u32 *pfit_control, u32 *pfit_pgm_ratios,
 322                               u32 *border)
 323 {
 324         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 325         u32 scaled_width = adjusted_mode->crtc_hdisplay *
 326                 pipe_config->pipe_src_h;
 327         u32 scaled_height = pipe_config->pipe_src_w *
 328                 adjusted_mode->crtc_vdisplay;
 329         u32 bits;
 330 
 331         /*
 332          * For earlier chips we have to calculate the scaling
 333          * ratio by hand and program it into the
 334          * PFIT_PGM_RATIO register
 335          */
 336         if (scaled_width > scaled_height) { /* pillar */
 337                 centre_horizontally(adjusted_mode,
 338                                     scaled_height /
 339                                     pipe_config->pipe_src_h);
 340 
 341                 *border = LVDS_BORDER_ENABLE;
 342                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
 343                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
 344                                                     adjusted_mode->crtc_vdisplay);
 345 
 346                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 347                                              bits << PFIT_VERT_SCALE_SHIFT);
 348                         *pfit_control |= (PFIT_ENABLE |
 349                                           VERT_INTERP_BILINEAR |
 350                                           HORIZ_INTERP_BILINEAR);
 351                 }
 352         } else if (scaled_width < scaled_height) { /* letter */
 353                 centre_vertically(adjusted_mode,
 354                                   scaled_width /
 355                                   pipe_config->pipe_src_w);
 356 
 357                 *border = LVDS_BORDER_ENABLE;
 358                 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 359                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
 360                                                     adjusted_mode->crtc_hdisplay);
 361 
 362                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
 363                                              bits << PFIT_VERT_SCALE_SHIFT);
 364                         *pfit_control |= (PFIT_ENABLE |
 365                                           VERT_INTERP_BILINEAR |
 366                                           HORIZ_INTERP_BILINEAR);
 367                 }
 368         } else {
 369                 /* Aspects match, Let hw scale both directions */
 370                 *pfit_control |= (PFIT_ENABLE |
 371                                   VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 372                                   VERT_INTERP_BILINEAR |
 373                                   HORIZ_INTERP_BILINEAR);
 374         }
 375 }
 376 
 377 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 378                               struct intel_crtc_state *pipe_config,
 379                               int fitting_mode)
 380 {
 381         struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
 382         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
 383         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 384 
 385         /* Native modes don't need fitting */
 386         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
 387             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
 388                 goto out;
 389 
 390         switch (fitting_mode) {
 391         case DRM_MODE_SCALE_CENTER:
 392                 /*
 393                  * For centered modes, we have to calculate border widths &
 394                  * heights and modify the values programmed into the CRTC.
 395                  */
 396                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
 397                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
 398                 border = LVDS_BORDER_ENABLE;
 399                 break;
 400         case DRM_MODE_SCALE_ASPECT:
 401                 /* Scale but preserve the aspect ratio */
 402                 if (INTEL_GEN(dev_priv) >= 4)
 403                         i965_scale_aspect(pipe_config, &pfit_control);
 404                 else
 405                         i9xx_scale_aspect(pipe_config, &pfit_control,
 406                                           &pfit_pgm_ratios, &border);
 407                 break;
 408         case DRM_MODE_SCALE_FULLSCREEN:
 409                 /*
 410                  * Full scaling, even if it changes the aspect ratio.
 411                  * Fortunately this is all done for us in hw.
 412                  */
 413                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
 414                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
 415                         pfit_control |= PFIT_ENABLE;
 416                         if (INTEL_GEN(dev_priv) >= 4)
 417                                 pfit_control |= PFIT_SCALING_AUTO;
 418                         else
 419                                 pfit_control |= (VERT_AUTO_SCALE |
 420                                                  VERT_INTERP_BILINEAR |
 421                                                  HORIZ_AUTO_SCALE |
 422                                                  HORIZ_INTERP_BILINEAR);
 423                 }
 424                 break;
 425         default:
 426                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
 427                 return;
 428         }
 429 
 430         /* 965+ wants fuzzy fitting */
 431         /* FIXME: handle multiple panels by failing gracefully */
 432         if (INTEL_GEN(dev_priv) >= 4)
 433                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 434                                  PFIT_FILTER_FUZZY);
 435 
 436 out:
 437         if ((pfit_control & PFIT_ENABLE) == 0) {
 438                 pfit_control = 0;
 439                 pfit_pgm_ratios = 0;
 440         }
 441 
 442         /* Make sure pre-965 set dither correctly for 18bpp panels. */
 443         if (INTEL_GEN(dev_priv) < 4 && pipe_config->pipe_bpp == 18)
 444                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 445 
 446         pipe_config->gmch_pfit.control = pfit_control;
 447         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 448         pipe_config->gmch_pfit.lvds_border_bits = border;
 449 }
 450 
 451 /**
 452  * scale - scale values from one range to another
 453  * @source_val: value in range [@source_min..@source_max]
 454  * @source_min: minimum legal value for @source_val
 455  * @source_max: maximum legal value for @source_val
 456  * @target_min: corresponding target value for @source_min
 457  * @target_max: corresponding target value for @source_max
 458  *
 459  * Return @source_val in range [@source_min..@source_max] scaled to range
 460  * [@target_min..@target_max].
 461  */
 462 static u32 scale(u32 source_val,
 463                  u32 source_min, u32 source_max,
 464                  u32 target_min, u32 target_max)
 465 {
 466         u64 target_val;
 467 
 468         WARN_ON(source_min > source_max);
 469         WARN_ON(target_min > target_max);
 470 
 471         /* defensive */
 472         source_val = clamp(source_val, source_min, source_max);
 473 
 474         /* avoid overflows */
 475         target_val = mul_u32_u32(source_val - source_min,
 476                                  target_max - target_min);
 477         target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
 478         target_val += target_min;
 479 
 480         return target_val;
 481 }
 482 
 483 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 484 static inline u32 scale_user_to_hw(struct intel_connector *connector,
 485                                    u32 user_level, u32 user_max)
 486 {
 487         struct intel_panel *panel = &connector->panel;
 488 
 489         return scale(user_level, 0, user_max,
 490                      panel->backlight.min, panel->backlight.max);
 491 }
 492 
 493 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
 494  * to [hw_min..hw_max]. */
 495 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
 496                                    u32 user_level, u32 user_max)
 497 {
 498         struct intel_panel *panel = &connector->panel;
 499         u32 hw_level;
 500 
 501         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
 502         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
 503 
 504         return hw_level;
 505 }
 506 
 507 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
 508 static inline u32 scale_hw_to_user(struct intel_connector *connector,
 509                                    u32 hw_level, u32 user_max)
 510 {
 511         struct intel_panel *panel = &connector->panel;
 512 
 513         return scale(hw_level, panel->backlight.min, panel->backlight.max,
 514                      0, user_max);
 515 }
 516 
 517 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
 518                                           u32 val)
 519 {
 520         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 521         struct intel_panel *panel = &connector->panel;
 522 
 523         WARN_ON(panel->backlight.max == 0);
 524 
 525         if (i915_modparams.invert_brightness < 0)
 526                 return val;
 527 
 528         if (i915_modparams.invert_brightness > 0 ||
 529             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 530                 return panel->backlight.max - val + panel->backlight.min;
 531         }
 532 
 533         return val;
 534 }
 535 
 536 static u32 lpt_get_backlight(struct intel_connector *connector)
 537 {
 538         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 539 
 540         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 541 }
 542 
 543 static u32 pch_get_backlight(struct intel_connector *connector)
 544 {
 545         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 546 
 547         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 548 }
 549 
 550 static u32 i9xx_get_backlight(struct intel_connector *connector)
 551 {
 552         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 553         struct intel_panel *panel = &connector->panel;
 554         u32 val;
 555 
 556         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 557         if (INTEL_GEN(dev_priv) < 4)
 558                 val >>= 1;
 559 
 560         if (panel->backlight.combination_mode) {
 561                 u8 lbpc;
 562 
 563                 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
 564                 val *= lbpc;
 565         }
 566 
 567         return val;
 568 }
 569 
 570 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
 571 {
 572         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
 573                 return 0;
 574 
 575         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 576 }
 577 
 578 static u32 vlv_get_backlight(struct intel_connector *connector)
 579 {
 580         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 581         enum pipe pipe = intel_connector_get_pipe(connector);
 582 
 583         return _vlv_get_backlight(dev_priv, pipe);
 584 }
 585 
 586 static u32 bxt_get_backlight(struct intel_connector *connector)
 587 {
 588         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 589         struct intel_panel *panel = &connector->panel;
 590 
 591         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
 592 }
 593 
 594 static u32 pwm_get_backlight(struct intel_connector *connector)
 595 {
 596         struct intel_panel *panel = &connector->panel;
 597         int duty_ns;
 598 
 599         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
 600         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
 601 }
 602 
 603 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 604 {
 605         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 606         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 607 
 608         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 609         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 610 }
 611 
 612 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 613 {
 614         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 615         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 616         u32 tmp;
 617 
 618         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 619         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 620 }
 621 
 622 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 623 {
 624         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 625         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 626         struct intel_panel *panel = &connector->panel;
 627         u32 tmp, mask;
 628 
 629         WARN_ON(panel->backlight.max == 0);
 630 
 631         if (panel->backlight.combination_mode) {
 632                 u8 lbpc;
 633 
 634                 lbpc = level * 0xfe / panel->backlight.max + 1;
 635                 level /= lbpc;
 636                 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
 637         }
 638 
 639         if (IS_GEN(dev_priv, 4)) {
 640                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 641         } else {
 642                 level <<= 1;
 643                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 644         }
 645 
 646         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
 647         I915_WRITE(BLC_PWM_CTL, tmp | level);
 648 }
 649 
 650 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 651 {
 652         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 653         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 654         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 655         u32 tmp;
 656 
 657         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 658         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 659 }
 660 
 661 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 662 {
 663         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 664         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 665         struct intel_panel *panel = &connector->panel;
 666 
 667         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 668 }
 669 
 670 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 671 {
 672         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 673         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 674 
 675         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 676 }
 677 
 678 static void
 679 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 680 {
 681         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 682         struct intel_panel *panel = &connector->panel;
 683 
 684         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 685 
 686         level = intel_panel_compute_brightness(connector, level);
 687         panel->backlight.set(conn_state, level);
 688 }
 689 
 690 /* set backlight brightness to level in range [0..max], assuming hw min is
 691  * respected.
 692  */
 693 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 694                                     u32 user_level, u32 user_max)
 695 {
 696         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 697         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 698         struct intel_panel *panel = &connector->panel;
 699         u32 hw_level;
 700 
 701         /*
 702          * Lack of crtc may occur during driver init because
 703          * connection_mutex isn't held across the entire backlight
 704          * setup + modeset readout, and the BIOS can issue the
 705          * requests at any time.
 706          */
 707         if (!panel->backlight.present || !conn_state->crtc)
 708                 return;
 709 
 710         mutex_lock(&dev_priv->backlight_lock);
 711 
 712         WARN_ON(panel->backlight.max == 0);
 713 
 714         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 715         panel->backlight.level = hw_level;
 716 
 717         if (panel->backlight.device)
 718                 panel->backlight.device->props.brightness =
 719                         scale_hw_to_user(connector,
 720                                          panel->backlight.level,
 721                                          panel->backlight.device->props.max_brightness);
 722 
 723         if (panel->backlight.enabled)
 724                 intel_panel_actually_set_backlight(conn_state, hw_level);
 725 
 726         mutex_unlock(&dev_priv->backlight_lock);
 727 }
 728 
 729 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
 730 {
 731         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 732         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 733         u32 tmp;
 734 
 735         intel_panel_actually_set_backlight(old_conn_state, 0);
 736 
 737         /*
 738          * Although we don't support or enable CPU PWM with LPT/SPT based
 739          * systems, it may have been enabled prior to loading the
 740          * driver. Disable to avoid warnings on LCPLL disable.
 741          *
 742          * This needs rework if we need to add support for CPU PWM on PCH split
 743          * platforms.
 744          */
 745         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 746         if (tmp & BLM_PWM_ENABLE) {
 747                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
 748                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 749         }
 750 
 751         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 752         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 753 }
 754 
 755 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
 756 {
 757         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 758         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 759         u32 tmp;
 760 
 761         intel_panel_actually_set_backlight(old_conn_state, 0);
 762 
 763         tmp = I915_READ(BLC_PWM_CPU_CTL2);
 764         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 765 
 766         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 767         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 768 }
 769 
 770 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
 771 {
 772         intel_panel_actually_set_backlight(old_conn_state, 0);
 773 }
 774 
 775 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
 776 {
 777         struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 778         u32 tmp;
 779 
 780         intel_panel_actually_set_backlight(old_conn_state, 0);
 781 
 782         tmp = I915_READ(BLC_PWM_CTL2);
 783         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 784 }
 785 
 786 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
 787 {
 788         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 789         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 790         enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 791         u32 tmp;
 792 
 793         intel_panel_actually_set_backlight(old_conn_state, 0);
 794 
 795         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 796         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 797 }
 798 
 799 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
 800 {
 801         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 802         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 803         struct intel_panel *panel = &connector->panel;
 804         u32 tmp, val;
 805 
 806         intel_panel_actually_set_backlight(old_conn_state, 0);
 807 
 808         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 809         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 810                         tmp & ~BXT_BLC_PWM_ENABLE);
 811 
 812         if (panel->backlight.controller == 1) {
 813                 val = I915_READ(UTIL_PIN_CTL);
 814                 val &= ~UTIL_PIN_ENABLE;
 815                 I915_WRITE(UTIL_PIN_CTL, val);
 816         }
 817 }
 818 
 819 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
 820 {
 821         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 822         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 823         struct intel_panel *panel = &connector->panel;
 824         u32 tmp;
 825 
 826         intel_panel_actually_set_backlight(old_conn_state, 0);
 827 
 828         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 829         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 830                    tmp & ~BXT_BLC_PWM_ENABLE);
 831 }
 832 
 833 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
 834 {
 835         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 836         struct intel_panel *panel = &connector->panel;
 837 
 838         /* Disable the backlight */
 839         intel_panel_actually_set_backlight(old_conn_state, 0);
 840         usleep_range(2000, 3000);
 841         pwm_disable(panel->backlight.pwm);
 842 }
 843 
 844 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
 845 {
 846         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 847         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 848         struct intel_panel *panel = &connector->panel;
 849 
 850         if (!panel->backlight.present)
 851                 return;
 852 
 853         /*
 854          * Do not disable backlight on the vga_switcheroo path. When switching
 855          * away from i915, the other client may depend on i915 to handle the
 856          * backlight. This will leave the backlight on unnecessarily when
 857          * another client is not activated.
 858          */
 859         if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 860                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
 861                 return;
 862         }
 863 
 864         mutex_lock(&dev_priv->backlight_lock);
 865 
 866         if (panel->backlight.device)
 867                 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 868         panel->backlight.enabled = false;
 869         panel->backlight.disable(old_conn_state);
 870 
 871         mutex_unlock(&dev_priv->backlight_lock);
 872 }
 873 
 874 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 875                                  const struct drm_connector_state *conn_state)
 876 {
 877         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 878         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 879         struct intel_panel *panel = &connector->panel;
 880         u32 pch_ctl1, pch_ctl2, schicken;
 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 (HAS_PCH_LPT(dev_priv)) {
 890                 schicken = I915_READ(SOUTH_CHICKEN2);
 891                 if (panel->backlight.alternate_pwm_increment)
 892                         schicken |= LPT_PWM_GRANULARITY;
 893                 else
 894                         schicken &= ~LPT_PWM_GRANULARITY;
 895                 I915_WRITE(SOUTH_CHICKEN2, schicken);
 896         } else {
 897                 schicken = I915_READ(SOUTH_CHICKEN1);
 898                 if (panel->backlight.alternate_pwm_increment)
 899                         schicken |= SPT_PWM_GRANULARITY;
 900                 else
 901                         schicken &= ~SPT_PWM_GRANULARITY;
 902                 I915_WRITE(SOUTH_CHICKEN1, schicken);
 903         }
 904 
 905         pch_ctl2 = panel->backlight.max << 16;
 906         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 907 
 908         pch_ctl1 = 0;
 909         if (panel->backlight.active_low_pwm)
 910                 pch_ctl1 |= BLM_PCH_POLARITY;
 911 
 912         /* After LPT, override is the default. */
 913         if (HAS_PCH_LPT(dev_priv))
 914                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 915 
 916         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 917         POSTING_READ(BLC_PWM_PCH_CTL1);
 918         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 919 
 920         /* This won't stick until the above enable. */
 921         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 922 }
 923 
 924 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 925                                  const struct drm_connector_state *conn_state)
 926 {
 927         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 928         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 929         struct intel_panel *panel = &connector->panel;
 930         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 931         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 932 
 933         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 934         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 935                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
 936                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 937                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 938         }
 939 
 940         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
 941         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 942                 DRM_DEBUG_KMS("pch backlight already enabled\n");
 943                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 944                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 945         }
 946 
 947         if (cpu_transcoder == TRANSCODER_EDP)
 948                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 949         else
 950                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 951         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
 952         POSTING_READ(BLC_PWM_CPU_CTL2);
 953         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 954 
 955         /* This won't stick until the above enable. */
 956         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 957 
 958         pch_ctl2 = panel->backlight.max << 16;
 959         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
 960 
 961         pch_ctl1 = 0;
 962         if (panel->backlight.active_low_pwm)
 963                 pch_ctl1 |= BLM_PCH_POLARITY;
 964 
 965         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
 966         POSTING_READ(BLC_PWM_PCH_CTL1);
 967         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 968 }
 969 
 970 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
 971                                   const struct drm_connector_state *conn_state)
 972 {
 973         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 974         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 975         struct intel_panel *panel = &connector->panel;
 976         u32 ctl, freq;
 977 
 978         ctl = I915_READ(BLC_PWM_CTL);
 979         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 980                 DRM_DEBUG_KMS("backlight already enabled\n");
 981                 I915_WRITE(BLC_PWM_CTL, 0);
 982         }
 983 
 984         freq = panel->backlight.max;
 985         if (panel->backlight.combination_mode)
 986                 freq /= 0xff;
 987 
 988         ctl = freq << 17;
 989         if (panel->backlight.combination_mode)
 990                 ctl |= BLM_LEGACY_MODE;
 991         if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
 992                 ctl |= BLM_POLARITY_PNV;
 993 
 994         I915_WRITE(BLC_PWM_CTL, ctl);
 995         POSTING_READ(BLC_PWM_CTL);
 996 
 997         /* XXX: combine this into above write? */
 998         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 999 
1000         /*
1001          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
1002          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
1003          * that has backlight.
1004          */
1005         if (IS_GEN(dev_priv, 2))
1006                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
1007 }
1008 
1009 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
1010                                   const struct drm_connector_state *conn_state)
1011 {
1012         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1013         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1014         struct intel_panel *panel = &connector->panel;
1015         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1016         u32 ctl, ctl2, freq;
1017 
1018         ctl2 = I915_READ(BLC_PWM_CTL2);
1019         if (ctl2 & BLM_PWM_ENABLE) {
1020                 DRM_DEBUG_KMS("backlight already enabled\n");
1021                 ctl2 &= ~BLM_PWM_ENABLE;
1022                 I915_WRITE(BLC_PWM_CTL2, ctl2);
1023         }
1024 
1025         freq = panel->backlight.max;
1026         if (panel->backlight.combination_mode)
1027                 freq /= 0xff;
1028 
1029         ctl = freq << 16;
1030         I915_WRITE(BLC_PWM_CTL, ctl);
1031 
1032         ctl2 = BLM_PIPE(pipe);
1033         if (panel->backlight.combination_mode)
1034                 ctl2 |= BLM_COMBINATION_MODE;
1035         if (panel->backlight.active_low_pwm)
1036                 ctl2 |= BLM_POLARITY_I965;
1037         I915_WRITE(BLC_PWM_CTL2, ctl2);
1038         POSTING_READ(BLC_PWM_CTL2);
1039         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1040 
1041         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1042 }
1043 
1044 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1045                                  const struct drm_connector_state *conn_state)
1046 {
1047         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1048         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1049         struct intel_panel *panel = &connector->panel;
1050         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1051         u32 ctl, ctl2;
1052 
1053         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1054         if (ctl2 & BLM_PWM_ENABLE) {
1055                 DRM_DEBUG_KMS("backlight already enabled\n");
1056                 ctl2 &= ~BLM_PWM_ENABLE;
1057                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1058         }
1059 
1060         ctl = panel->backlight.max << 16;
1061         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1062 
1063         /* XXX: combine this into above write? */
1064         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1065 
1066         ctl2 = 0;
1067         if (panel->backlight.active_low_pwm)
1068                 ctl2 |= BLM_POLARITY_I965;
1069         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1070         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1071         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1072 }
1073 
1074 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1075                                  const struct drm_connector_state *conn_state)
1076 {
1077         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1078         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1079         struct intel_panel *panel = &connector->panel;
1080         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1081         u32 pwm_ctl, val;
1082 
1083         /* Controller 1 uses the utility pin. */
1084         if (panel->backlight.controller == 1) {
1085                 val = I915_READ(UTIL_PIN_CTL);
1086                 if (val & UTIL_PIN_ENABLE) {
1087                         DRM_DEBUG_KMS("util pin already enabled\n");
1088                         val &= ~UTIL_PIN_ENABLE;
1089                         I915_WRITE(UTIL_PIN_CTL, val);
1090                 }
1091 
1092                 val = 0;
1093                 if (panel->backlight.util_pin_active_low)
1094                         val |= UTIL_PIN_POLARITY;
1095                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1096                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1097         }
1098 
1099         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1100         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1101                 DRM_DEBUG_KMS("backlight already enabled\n");
1102                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1103                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1104                                 pwm_ctl);
1105         }
1106 
1107         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1108                         panel->backlight.max);
1109 
1110         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1111 
1112         pwm_ctl = 0;
1113         if (panel->backlight.active_low_pwm)
1114                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1115 
1116         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1117         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1118         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1119                         pwm_ctl | BXT_BLC_PWM_ENABLE);
1120 }
1121 
1122 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1123                                  const struct drm_connector_state *conn_state)
1124 {
1125         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1126         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1127         struct intel_panel *panel = &connector->panel;
1128         u32 pwm_ctl;
1129 
1130         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1131         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1132                 DRM_DEBUG_KMS("backlight already enabled\n");
1133                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1134                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1135                            pwm_ctl);
1136         }
1137 
1138         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1139                    panel->backlight.max);
1140 
1141         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1142 
1143         pwm_ctl = 0;
1144         if (panel->backlight.active_low_pwm)
1145                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1146 
1147         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1148         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1149         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1150                    pwm_ctl | BXT_BLC_PWM_ENABLE);
1151 }
1152 
1153 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1154                                  const struct drm_connector_state *conn_state)
1155 {
1156         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1157         struct intel_panel *panel = &connector->panel;
1158 
1159         pwm_enable(panel->backlight.pwm);
1160         intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1161 }
1162 
1163 static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1164                                            const struct drm_connector_state *conn_state)
1165 {
1166         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1167         struct intel_panel *panel = &connector->panel;
1168 
1169         WARN_ON(panel->backlight.max == 0);
1170 
1171         if (panel->backlight.level <= panel->backlight.min) {
1172                 panel->backlight.level = panel->backlight.max;
1173                 if (panel->backlight.device)
1174                         panel->backlight.device->props.brightness =
1175                                 scale_hw_to_user(connector,
1176                                                  panel->backlight.level,
1177                                                  panel->backlight.device->props.max_brightness);
1178         }
1179 
1180         panel->backlight.enable(crtc_state, conn_state);
1181         panel->backlight.enabled = true;
1182         if (panel->backlight.device)
1183                 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1184 }
1185 
1186 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1187                                   const struct drm_connector_state *conn_state)
1188 {
1189         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1190         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1191         struct intel_panel *panel = &connector->panel;
1192         enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1193 
1194         if (!panel->backlight.present)
1195                 return;
1196 
1197         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1198 
1199         mutex_lock(&dev_priv->backlight_lock);
1200 
1201         __intel_panel_enable_backlight(crtc_state, conn_state);
1202 
1203         mutex_unlock(&dev_priv->backlight_lock);
1204 }
1205 
1206 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1207 static u32 intel_panel_get_backlight(struct intel_connector *connector)
1208 {
1209         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1210         struct intel_panel *panel = &connector->panel;
1211         u32 val = 0;
1212 
1213         mutex_lock(&dev_priv->backlight_lock);
1214 
1215         if (panel->backlight.enabled) {
1216                 val = panel->backlight.get(connector);
1217                 val = intel_panel_compute_brightness(connector, val);
1218         }
1219 
1220         mutex_unlock(&dev_priv->backlight_lock);
1221 
1222         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
1223         return val;
1224 }
1225 
1226 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
1227 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1228                                       u32 user_level, u32 user_max)
1229 {
1230         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1231         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1232         struct intel_panel *panel = &connector->panel;
1233         u32 hw_level;
1234 
1235         if (!panel->backlight.present)
1236                 return;
1237 
1238         mutex_lock(&dev_priv->backlight_lock);
1239 
1240         WARN_ON(panel->backlight.max == 0);
1241 
1242         hw_level = scale_user_to_hw(connector, user_level, user_max);
1243         panel->backlight.level = hw_level;
1244 
1245         if (panel->backlight.enabled)
1246                 intel_panel_actually_set_backlight(conn_state, hw_level);
1247 
1248         mutex_unlock(&dev_priv->backlight_lock);
1249 }
1250 
1251 static int intel_backlight_device_update_status(struct backlight_device *bd)
1252 {
1253         struct intel_connector *connector = bl_get_data(bd);
1254         struct intel_panel *panel = &connector->panel;
1255         struct drm_device *dev = connector->base.dev;
1256 
1257         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1258         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1259                       bd->props.brightness, bd->props.max_brightness);
1260         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1261                                   bd->props.max_brightness);
1262 
1263         /*
1264          * Allow flipping bl_power as a sub-state of enabled. Sadly the
1265          * backlight class device does not make it easy to to differentiate
1266          * between callbacks for brightness and bl_power, so our backlight_power
1267          * callback needs to take this into account.
1268          */
1269         if (panel->backlight.enabled) {
1270                 if (panel->backlight.power) {
1271                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1272                                 bd->props.brightness != 0;
1273                         panel->backlight.power(connector, enable);
1274                 }
1275         } else {
1276                 bd->props.power = FB_BLANK_POWERDOWN;
1277         }
1278 
1279         drm_modeset_unlock(&dev->mode_config.connection_mutex);
1280         return 0;
1281 }
1282 
1283 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1284 {
1285         struct intel_connector *connector = bl_get_data(bd);
1286         struct drm_device *dev = connector->base.dev;
1287         struct drm_i915_private *dev_priv = to_i915(dev);
1288         intel_wakeref_t wakeref;
1289         int ret = 0;
1290 
1291         with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
1292                 u32 hw_level;
1293 
1294                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1295 
1296                 hw_level = intel_panel_get_backlight(connector);
1297                 ret = scale_hw_to_user(connector,
1298                                        hw_level, bd->props.max_brightness);
1299 
1300                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1301         }
1302 
1303         return ret;
1304 }
1305 
1306 static const struct backlight_ops intel_backlight_device_ops = {
1307         .update_status = intel_backlight_device_update_status,
1308         .get_brightness = intel_backlight_device_get_brightness,
1309 };
1310 
1311 int intel_backlight_device_register(struct intel_connector *connector)
1312 {
1313         struct intel_panel *panel = &connector->panel;
1314         struct backlight_properties props;
1315 
1316         if (WARN_ON(panel->backlight.device))
1317                 return -ENODEV;
1318 
1319         if (!panel->backlight.present)
1320                 return 0;
1321 
1322         WARN_ON(panel->backlight.max == 0);
1323 
1324         memset(&props, 0, sizeof(props));
1325         props.type = BACKLIGHT_RAW;
1326 
1327         /*
1328          * Note: Everything should work even if the backlight device max
1329          * presented to the userspace is arbitrarily chosen.
1330          */
1331         props.max_brightness = panel->backlight.max;
1332         props.brightness = scale_hw_to_user(connector,
1333                                             panel->backlight.level,
1334                                             props.max_brightness);
1335 
1336         if (panel->backlight.enabled)
1337                 props.power = FB_BLANK_UNBLANK;
1338         else
1339                 props.power = FB_BLANK_POWERDOWN;
1340 
1341         /*
1342          * Note: using the same name independent of the connector prevents
1343          * registration of multiple backlight devices in the driver.
1344          */
1345         panel->backlight.device =
1346                 backlight_device_register("intel_backlight",
1347                                           connector->base.kdev,
1348                                           connector,
1349                                           &intel_backlight_device_ops, &props);
1350 
1351         if (IS_ERR(panel->backlight.device)) {
1352                 DRM_ERROR("Failed to register backlight: %ld\n",
1353                           PTR_ERR(panel->backlight.device));
1354                 panel->backlight.device = NULL;
1355                 return -ENODEV;
1356         }
1357 
1358         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1359                       connector->base.name);
1360 
1361         return 0;
1362 }
1363 
1364 void intel_backlight_device_unregister(struct intel_connector *connector)
1365 {
1366         struct intel_panel *panel = &connector->panel;
1367 
1368         if (panel->backlight.device) {
1369                 backlight_device_unregister(panel->backlight.device);
1370                 panel->backlight.device = NULL;
1371         }
1372 }
1373 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1374 
1375 /*
1376  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1377  *      PWM increment = 1
1378  */
1379 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1380 {
1381         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1382 
1383         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1384 }
1385 
1386 /*
1387  * BXT: PWM clock frequency = 19.2 MHz.
1388  */
1389 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1390 {
1391         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1392 }
1393 
1394 /*
1395  * SPT: This value represents the period of the PWM stream in clock periods
1396  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1397  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1398  */
1399 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1400 {
1401         struct intel_panel *panel = &connector->panel;
1402         u32 mul;
1403 
1404         if (panel->backlight.alternate_pwm_increment)
1405                 mul = 128;
1406         else
1407                 mul = 16;
1408 
1409         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1410 }
1411 
1412 /*
1413  * LPT: This value represents the period of the PWM stream in clock periods
1414  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1415  * LPT SOUTH_CHICKEN2 register bit 5).
1416  */
1417 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1418 {
1419         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1420         struct intel_panel *panel = &connector->panel;
1421         u32 mul, clock;
1422 
1423         if (panel->backlight.alternate_pwm_increment)
1424                 mul = 16;
1425         else
1426                 mul = 128;
1427 
1428         if (HAS_PCH_LPT_H(dev_priv))
1429                 clock = MHz(135); /* LPT:H */
1430         else
1431                 clock = MHz(24); /* LPT:LP */
1432 
1433         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1434 }
1435 
1436 /*
1437  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1438  * display raw clocks multiplied by 128.
1439  */
1440 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1441 {
1442         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1443 
1444         return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1445 }
1446 
1447 /*
1448  * Gen2: This field determines the number of time base events (display core
1449  * clock frequency/32) in total for a complete cycle of modulated backlight
1450  * control.
1451  *
1452  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1453  * divided by 32.
1454  */
1455 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1456 {
1457         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1458         int clock;
1459 
1460         if (IS_PINEVIEW(dev_priv))
1461                 clock = KHz(dev_priv->rawclk_freq);
1462         else
1463                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1464 
1465         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1466 }
1467 
1468 /*
1469  * Gen4: This value represents the period of the PWM stream in display core
1470  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1471  *
1472  */
1473 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1474 {
1475         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1476         int clock;
1477 
1478         if (IS_G4X(dev_priv))
1479                 clock = KHz(dev_priv->rawclk_freq);
1480         else
1481                 clock = KHz(dev_priv->cdclk.hw.cdclk);
1482 
1483         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1484 }
1485 
1486 /*
1487  * VLV: This value represents the period of the PWM stream in display core
1488  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1489  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1490  */
1491 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1492 {
1493         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1494         int mul, clock;
1495 
1496         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1497                 if (IS_CHERRYVIEW(dev_priv))
1498                         clock = KHz(19200);
1499                 else
1500                         clock = MHz(25);
1501                 mul = 16;
1502         } else {
1503                 clock = KHz(dev_priv->rawclk_freq);
1504                 mul = 128;
1505         }
1506 
1507         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1508 }
1509 
1510 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1511 {
1512         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1513         struct intel_panel *panel = &connector->panel;
1514         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1515         u32 pwm;
1516 
1517         if (!panel->backlight.hz_to_pwm) {
1518                 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1519                 return 0;
1520         }
1521 
1522         if (pwm_freq_hz) {
1523                 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1524                               pwm_freq_hz);
1525         } else {
1526                 pwm_freq_hz = 200;
1527                 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1528                               pwm_freq_hz);
1529         }
1530 
1531         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1532         if (!pwm) {
1533                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1534                 return 0;
1535         }
1536 
1537         return pwm;
1538 }
1539 
1540 /*
1541  * Note: The setup hooks can't assume pipe is set!
1542  */
1543 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1544 {
1545         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1546         struct intel_panel *panel = &connector->panel;
1547         int min;
1548 
1549         WARN_ON(panel->backlight.max == 0);
1550 
1551         /*
1552          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1553          * to problems. There are such machines out there. Either our
1554          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1555          * against this by letting the minimum be at most (arbitrarily chosen)
1556          * 25% of the max.
1557          */
1558         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1559         if (min != dev_priv->vbt.backlight.min_brightness) {
1560                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1561                               dev_priv->vbt.backlight.min_brightness, min);
1562         }
1563 
1564         /* vbt value is a coefficient in range [0..255] */
1565         return scale(min, 0, 255, 0, panel->backlight.max);
1566 }
1567 
1568 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1569 {
1570         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1571         struct intel_panel *panel = &connector->panel;
1572         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1573         bool alt, cpu_mode;
1574 
1575         if (HAS_PCH_LPT(dev_priv))
1576                 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1577         else
1578                 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1579         panel->backlight.alternate_pwm_increment = alt;
1580 
1581         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1582         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1583 
1584         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1585         panel->backlight.max = pch_ctl2 >> 16;
1586 
1587         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1588 
1589         if (!panel->backlight.max)
1590                 panel->backlight.max = get_backlight_max_vbt(connector);
1591 
1592         if (!panel->backlight.max)
1593                 return -ENODEV;
1594 
1595         panel->backlight.min = get_backlight_min_vbt(connector);
1596 
1597         panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1598 
1599         cpu_mode = panel->backlight.enabled && HAS_PCH_LPT(dev_priv) &&
1600                    !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1601                    (cpu_ctl2 & BLM_PWM_ENABLE);
1602         if (cpu_mode)
1603                 val = pch_get_backlight(connector);
1604         else
1605                 val = lpt_get_backlight(connector);
1606         val = intel_panel_compute_brightness(connector, val);
1607         panel->backlight.level = clamp(val, panel->backlight.min,
1608                                        panel->backlight.max);
1609 
1610         if (cpu_mode) {
1611                 DRM_DEBUG_KMS("CPU backlight register was enabled, switching to PCH override\n");
1612 
1613                 /* Write converted CPU PWM value to PCH override register */
1614                 lpt_set_backlight(connector->base.state, panel->backlight.level);
1615                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1616 
1617                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 & ~BLM_PWM_ENABLE);
1618         }
1619 
1620         return 0;
1621 }
1622 
1623 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1624 {
1625         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1626         struct intel_panel *panel = &connector->panel;
1627         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1628 
1629         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1630         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1631 
1632         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1633         panel->backlight.max = pch_ctl2 >> 16;
1634 
1635         if (!panel->backlight.max)
1636                 panel->backlight.max = get_backlight_max_vbt(connector);
1637 
1638         if (!panel->backlight.max)
1639                 return -ENODEV;
1640 
1641         panel->backlight.min = get_backlight_min_vbt(connector);
1642 
1643         val = pch_get_backlight(connector);
1644         val = intel_panel_compute_brightness(connector, val);
1645         panel->backlight.level = clamp(val, panel->backlight.min,
1646                                        panel->backlight.max);
1647 
1648         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1649         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1650                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1651 
1652         return 0;
1653 }
1654 
1655 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1656 {
1657         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1658         struct intel_panel *panel = &connector->panel;
1659         u32 ctl, val;
1660 
1661         ctl = I915_READ(BLC_PWM_CTL);
1662 
1663         if (IS_GEN(dev_priv, 2) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1664                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1665 
1666         if (IS_PINEVIEW(dev_priv))
1667                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1668 
1669         panel->backlight.max = ctl >> 17;
1670 
1671         if (!panel->backlight.max) {
1672                 panel->backlight.max = get_backlight_max_vbt(connector);
1673                 panel->backlight.max >>= 1;
1674         }
1675 
1676         if (!panel->backlight.max)
1677                 return -ENODEV;
1678 
1679         if (panel->backlight.combination_mode)
1680                 panel->backlight.max *= 0xff;
1681 
1682         panel->backlight.min = get_backlight_min_vbt(connector);
1683 
1684         val = i9xx_get_backlight(connector);
1685         val = intel_panel_compute_brightness(connector, val);
1686         panel->backlight.level = clamp(val, panel->backlight.min,
1687                                        panel->backlight.max);
1688 
1689         panel->backlight.enabled = val != 0;
1690 
1691         return 0;
1692 }
1693 
1694 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1695 {
1696         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1697         struct intel_panel *panel = &connector->panel;
1698         u32 ctl, ctl2, val;
1699 
1700         ctl2 = I915_READ(BLC_PWM_CTL2);
1701         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1702         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1703 
1704         ctl = I915_READ(BLC_PWM_CTL);
1705         panel->backlight.max = ctl >> 16;
1706 
1707         if (!panel->backlight.max)
1708                 panel->backlight.max = get_backlight_max_vbt(connector);
1709 
1710         if (!panel->backlight.max)
1711                 return -ENODEV;
1712 
1713         if (panel->backlight.combination_mode)
1714                 panel->backlight.max *= 0xff;
1715 
1716         panel->backlight.min = get_backlight_min_vbt(connector);
1717 
1718         val = i9xx_get_backlight(connector);
1719         val = intel_panel_compute_brightness(connector, val);
1720         panel->backlight.level = clamp(val, panel->backlight.min,
1721                                        panel->backlight.max);
1722 
1723         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1724 
1725         return 0;
1726 }
1727 
1728 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1729 {
1730         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1731         struct intel_panel *panel = &connector->panel;
1732         u32 ctl, ctl2, val;
1733 
1734         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1735                 return -ENODEV;
1736 
1737         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1738         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1739 
1740         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1741         panel->backlight.max = ctl >> 16;
1742 
1743         if (!panel->backlight.max)
1744                 panel->backlight.max = get_backlight_max_vbt(connector);
1745 
1746         if (!panel->backlight.max)
1747                 return -ENODEV;
1748 
1749         panel->backlight.min = get_backlight_min_vbt(connector);
1750 
1751         val = _vlv_get_backlight(dev_priv, pipe);
1752         val = intel_panel_compute_brightness(connector, val);
1753         panel->backlight.level = clamp(val, panel->backlight.min,
1754                                        panel->backlight.max);
1755 
1756         panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1757 
1758         return 0;
1759 }
1760 
1761 static int
1762 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1763 {
1764         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1765         struct intel_panel *panel = &connector->panel;
1766         u32 pwm_ctl, val;
1767 
1768         panel->backlight.controller = dev_priv->vbt.backlight.controller;
1769 
1770         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1771 
1772         /* Controller 1 uses the utility pin. */
1773         if (panel->backlight.controller == 1) {
1774                 val = I915_READ(UTIL_PIN_CTL);
1775                 panel->backlight.util_pin_active_low =
1776                                         val & UTIL_PIN_POLARITY;
1777         }
1778 
1779         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1780         panel->backlight.max =
1781                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1782 
1783         if (!panel->backlight.max)
1784                 panel->backlight.max = get_backlight_max_vbt(connector);
1785 
1786         if (!panel->backlight.max)
1787                 return -ENODEV;
1788 
1789         panel->backlight.min = get_backlight_min_vbt(connector);
1790 
1791         val = bxt_get_backlight(connector);
1792         val = intel_panel_compute_brightness(connector, val);
1793         panel->backlight.level = clamp(val, panel->backlight.min,
1794                                        panel->backlight.max);
1795 
1796         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1797 
1798         return 0;
1799 }
1800 
1801 static int
1802 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1803 {
1804         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1805         struct intel_panel *panel = &connector->panel;
1806         u32 pwm_ctl, val;
1807 
1808         /*
1809          * CNP has the BXT implementation of backlight, but with only one
1810          * controller. TODO: ICP has multiple controllers but we only use
1811          * controller 0 for now.
1812          */
1813         panel->backlight.controller = 0;
1814 
1815         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1816 
1817         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1818         panel->backlight.max =
1819                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1820 
1821         if (!panel->backlight.max)
1822                 panel->backlight.max = get_backlight_max_vbt(connector);
1823 
1824         if (!panel->backlight.max)
1825                 return -ENODEV;
1826 
1827         panel->backlight.min = get_backlight_min_vbt(connector);
1828 
1829         val = bxt_get_backlight(connector);
1830         val = intel_panel_compute_brightness(connector, val);
1831         panel->backlight.level = clamp(val, panel->backlight.min,
1832                                        panel->backlight.max);
1833 
1834         panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1835 
1836         return 0;
1837 }
1838 
1839 static int pwm_setup_backlight(struct intel_connector *connector,
1840                                enum pipe pipe)
1841 {
1842         struct drm_device *dev = connector->base.dev;
1843         struct intel_panel *panel = &connector->panel;
1844         int retval;
1845 
1846         /* Get the PWM chip for backlight control */
1847         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1848         if (IS_ERR(panel->backlight.pwm)) {
1849                 DRM_ERROR("Failed to own the pwm chip\n");
1850                 panel->backlight.pwm = NULL;
1851                 return -ENODEV;
1852         }
1853 
1854         /*
1855          * FIXME: pwm_apply_args() should be removed when switching to
1856          * the atomic PWM API.
1857          */
1858         pwm_apply_args(panel->backlight.pwm);
1859 
1860         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1861                             CRC_PMIC_PWM_PERIOD_NS);
1862         if (retval < 0) {
1863                 DRM_ERROR("Failed to configure the pwm chip\n");
1864                 pwm_put(panel->backlight.pwm);
1865                 panel->backlight.pwm = NULL;
1866                 return retval;
1867         }
1868 
1869         panel->backlight.min = 0; /* 0% */
1870         panel->backlight.max = 100; /* 100% */
1871         panel->backlight.level = DIV_ROUND_UP(
1872                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1873                                  CRC_PMIC_PWM_PERIOD_NS);
1874         panel->backlight.enabled = panel->backlight.level != 0;
1875 
1876         return 0;
1877 }
1878 
1879 void intel_panel_update_backlight(struct intel_encoder *encoder,
1880                                   const struct intel_crtc_state *crtc_state,
1881                                   const struct drm_connector_state *conn_state)
1882 {
1883         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1884         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1885         struct intel_panel *panel = &connector->panel;
1886 
1887         if (!panel->backlight.present)
1888                 return;
1889 
1890         mutex_lock(&dev_priv->backlight_lock);
1891         if (!panel->backlight.enabled)
1892                 __intel_panel_enable_backlight(crtc_state, conn_state);
1893 
1894         mutex_unlock(&dev_priv->backlight_lock);
1895 }
1896 
1897 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1898 {
1899         struct drm_i915_private *dev_priv = to_i915(connector->dev);
1900         struct intel_connector *intel_connector = to_intel_connector(connector);
1901         struct intel_panel *panel = &intel_connector->panel;
1902         int ret;
1903 
1904         if (!dev_priv->vbt.backlight.present) {
1905                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1906                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1907                 } else {
1908                         DRM_DEBUG_KMS("no backlight present per VBT\n");
1909                         return 0;
1910                 }
1911         }
1912 
1913         /* ensure intel_panel has been initialized first */
1914         if (WARN_ON(!panel->backlight.setup))
1915                 return -ENODEV;
1916 
1917         /* set level and max in panel struct */
1918         mutex_lock(&dev_priv->backlight_lock);
1919         ret = panel->backlight.setup(intel_connector, pipe);
1920         mutex_unlock(&dev_priv->backlight_lock);
1921 
1922         if (ret) {
1923                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1924                               connector->name);
1925                 return ret;
1926         }
1927 
1928         panel->backlight.present = true;
1929 
1930         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1931                       connector->name,
1932                       enableddisabled(panel->backlight.enabled),
1933                       panel->backlight.level, panel->backlight.max);
1934 
1935         return 0;
1936 }
1937 
1938 static void intel_panel_destroy_backlight(struct intel_panel *panel)
1939 {
1940         /* dispose of the pwm */
1941         if (panel->backlight.pwm)
1942                 pwm_put(panel->backlight.pwm);
1943 
1944         panel->backlight.present = false;
1945 }
1946 
1947 /* Set up chip specific backlight functions */
1948 static void
1949 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1950 {
1951         struct intel_connector *connector =
1952                 container_of(panel, struct intel_connector, panel);
1953         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1954 
1955         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1956             intel_dp_aux_init_backlight_funcs(connector) == 0)
1957                 return;
1958 
1959         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1960             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1961                 return;
1962 
1963         if (IS_GEN9_LP(dev_priv)) {
1964                 panel->backlight.setup = bxt_setup_backlight;
1965                 panel->backlight.enable = bxt_enable_backlight;
1966                 panel->backlight.disable = bxt_disable_backlight;
1967                 panel->backlight.set = bxt_set_backlight;
1968                 panel->backlight.get = bxt_get_backlight;
1969                 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1970         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
1971                 panel->backlight.setup = cnp_setup_backlight;
1972                 panel->backlight.enable = cnp_enable_backlight;
1973                 panel->backlight.disable = cnp_disable_backlight;
1974                 panel->backlight.set = bxt_set_backlight;
1975                 panel->backlight.get = bxt_get_backlight;
1976                 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1977         } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
1978                 panel->backlight.setup = lpt_setup_backlight;
1979                 panel->backlight.enable = lpt_enable_backlight;
1980                 panel->backlight.disable = lpt_disable_backlight;
1981                 panel->backlight.set = lpt_set_backlight;
1982                 panel->backlight.get = lpt_get_backlight;
1983                 if (HAS_PCH_LPT(dev_priv))
1984                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1985                 else
1986                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1987         } else if (HAS_PCH_SPLIT(dev_priv)) {
1988                 panel->backlight.setup = pch_setup_backlight;
1989                 panel->backlight.enable = pch_enable_backlight;
1990                 panel->backlight.disable = pch_disable_backlight;
1991                 panel->backlight.set = pch_set_backlight;
1992                 panel->backlight.get = pch_get_backlight;
1993                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1994         } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1995                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1996                         panel->backlight.setup = pwm_setup_backlight;
1997                         panel->backlight.enable = pwm_enable_backlight;
1998                         panel->backlight.disable = pwm_disable_backlight;
1999                         panel->backlight.set = pwm_set_backlight;
2000                         panel->backlight.get = pwm_get_backlight;
2001                 } else {
2002                         panel->backlight.setup = vlv_setup_backlight;
2003                         panel->backlight.enable = vlv_enable_backlight;
2004                         panel->backlight.disable = vlv_disable_backlight;
2005                         panel->backlight.set = vlv_set_backlight;
2006                         panel->backlight.get = vlv_get_backlight;
2007                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
2008                 }
2009         } else if (IS_GEN(dev_priv, 4)) {
2010                 panel->backlight.setup = i965_setup_backlight;
2011                 panel->backlight.enable = i965_enable_backlight;
2012                 panel->backlight.disable = i965_disable_backlight;
2013                 panel->backlight.set = i9xx_set_backlight;
2014                 panel->backlight.get = i9xx_get_backlight;
2015                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
2016         } else {
2017                 panel->backlight.setup = i9xx_setup_backlight;
2018                 panel->backlight.enable = i9xx_enable_backlight;
2019                 panel->backlight.disable = i9xx_disable_backlight;
2020                 panel->backlight.set = i9xx_set_backlight;
2021                 panel->backlight.get = i9xx_get_backlight;
2022                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
2023         }
2024 }
2025 
2026 int intel_panel_init(struct intel_panel *panel,
2027                      struct drm_display_mode *fixed_mode,
2028                      struct drm_display_mode *downclock_mode)
2029 {
2030         intel_panel_init_backlight_funcs(panel);
2031 
2032         panel->fixed_mode = fixed_mode;
2033         panel->downclock_mode = downclock_mode;
2034 
2035         return 0;
2036 }
2037 
2038 void intel_panel_fini(struct intel_panel *panel)
2039 {
2040         struct intel_connector *intel_connector =
2041                 container_of(panel, struct intel_connector, panel);
2042 
2043         intel_panel_destroy_backlight(panel);
2044 
2045         if (panel->fixed_mode)
2046                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2047 
2048         if (panel->downclock_mode)
2049                 drm_mode_destroy(intel_connector->base.dev,
2050                                 panel->downclock_mode);
2051 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/i915/display/intel_panel.c

DEFINITIONS
