drivers/gpu/drm/i915/display/intel_backlight.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2021 Intel Corporation
   4  */
   5
   6 #include <linux/backlight.h>
   7 #include <linux/kernel.h>
   8 #include <linux/pwm.h>
   9 #include <linux/string_helpers.h>
  10
  11 #include <acpi/video.h>
  12
  13 #include "i915_drv.h"
  14 #include "i915_reg.h"
  15 #include "intel_backlight.h"
  16 #include "intel_backlight_regs.h"
  17 #include "intel_connector.h"
  18 #include "intel_de.h"
  19 #include "intel_display_types.h"
  20 #include "intel_dp_aux_backlight.h"
  21 #include "intel_dsi_dcs_backlight.h"
  22 #include "intel_panel.h"
  23 #include "intel_pci_config.h"
  24 #include "intel_pps.h"
  25 #include "intel_quirks.h"
  26
  27 /**
  28  * scale - scale values from one range to another
  29  * @source_val: value in range [@source_min..@source_max]
  30  * @source_min: minimum legal value for @source_val
  31  * @source_max: maximum legal value for @source_val
  32  * @target_min: corresponding target value for @source_min
  33  * @target_max: corresponding target value for @source_max
  34  *
  35  * Return @source_val in range [@source_min..@source_max] scaled to range
  36  * [@target_min..@target_max].
  37  */
  38 static u32 scale(u32 source_val,
  39                  u32 source_min, u32 source_max,
  40                  u32 target_min, u32 target_max)
  41 {
  42         u64 target_val;
  43
  44         if (WARN_ON(source_min >= source_max) ||
  45             WARN_ON(target_min > target_max))
  46                 return target_min;
  47
  48         /* defensive */
  49         source_val = clamp(source_val, source_min, source_max);
  50
  51         /* avoid overflows */
  52         target_val = mul_u32_u32(source_val - source_min,
  53                                  target_max - target_min);
  54         target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
  55         target_val += target_min;
  56
  57         return target_val;
  58 }
  59
  60 /*
  61  * Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
  62  * to [hw_min..hw_max].
  63  */
  64 static u32 clamp_user_to_hw(struct intel_connector *connector,
  65                             u32 user_level, u32 user_max)
  66 {
  67         struct intel_panel *panel = &connector->panel;
  68         u32 hw_level;
  69
  70         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
  71         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
  72
  73         return hw_level;
  74 }
  75
  76 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
  77 static u32 scale_hw_to_user(struct intel_connector *connector,
  78                             u32 hw_level, u32 user_max)
  79 {
  80         struct intel_panel *panel = &connector->panel;
  81
  82         return scale(hw_level, panel->backlight.min, panel->backlight.max,
  83                      0, user_max);
  84 }
  85
  86 u32 intel_backlight_invert_pwm_level(struct intel_connector *connector, u32 val)
  87 {
  88         struct intel_display *display = to_intel_display(connector);
  89         struct intel_panel *panel = &connector->panel;
  90
  91         drm_WARN_ON(display->drm, panel->backlight.pwm_level_max == 0);
  92
  93         if (display->params.invert_brightness < 0)
  94                 return val;
  95
  96         if (display->params.invert_brightness > 0 ||
  97             intel_has_quirk(display, QUIRK_INVERT_BRIGHTNESS)) {
  98                 return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
  99         }
 100
 101         return val;
 102 }
 103
 104 void intel_backlight_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
 105 {
 106         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 107         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 108         struct intel_panel *panel = &connector->panel;
 109
 110         drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight PWM = %d\n",
 111                     connector->base.base.id, connector->base.name, val);
 112         panel->backlight.pwm_funcs->set(conn_state, val);
 113 }
 114
 115 u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
 116 {
 117         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 118         struct intel_panel *panel = &connector->panel;
 119
 120         drm_WARN_ON_ONCE(&i915->drm,
 121                          panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
 122
 123         val = scale(val, panel->backlight.min, panel->backlight.max,
 124                     panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
 125
 126         return intel_backlight_invert_pwm_level(connector, val);
 127 }
 128
 129 u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
 130 {
 131         struct intel_display *display = to_intel_display(connector);
 132         struct intel_panel *panel = &connector->panel;
 133
 134         drm_WARN_ON_ONCE(display->drm,
 135                          panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
 136
 137         if (display->params.invert_brightness > 0 ||
 138             (display->params.invert_brightness == 0 &&
 139              intel_has_quirk(display, QUIRK_INVERT_BRIGHTNESS)))
 140                 val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
 141
 142         return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
 143                      panel->backlight.min, panel->backlight.max);
 144 }
 145
 146 static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
 147 {
 148         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 149
 150         return intel_de_read(i915, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
 151 }
 152
 153 static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
 154 {
 155         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 156
 157         return intel_de_read(i915, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 158 }
 159
 160 static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
 161 {
 162         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 163         struct intel_panel *panel = &connector->panel;
 164         u32 val;
 165
 166         val = intel_de_read(i915, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 167         if (DISPLAY_VER(i915) < 4)
 168                 val >>= 1;
 169
 170         if (panel->backlight.combination_mode) {
 171                 u8 lbpc;
 172
 173                 pci_read_config_byte(to_pci_dev(i915->drm.dev), LBPC, &lbpc);
 174                 val *= lbpc;
 175         }
 176
 177         return val;
 178 }
 179
 180 static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
 181 {
 182         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 183
 184         if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
 185                 return 0;
 186
 187         return intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 188 }
 189
 190 static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
 191 {
 192         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 193         struct intel_panel *panel = &connector->panel;
 194
 195         return intel_de_read(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller));
 196 }
 197
 198 static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
 199 {
 200         struct intel_panel *panel = &connector->panel;
 201         struct pwm_state state;
 202
 203         pwm_get_state(panel->backlight.pwm, &state);
 204         return pwm_get_relative_duty_cycle(&state, 100);
 205 }
 206
 207 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 208 {
 209         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 210         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 211         u32 val;
 212
 213         val = intel_de_read(i915, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 214         intel_de_write(i915, BLC_PWM_PCH_CTL2, val | level);
 215 }
 216
 217 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 218 {
 219         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 220         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 221         u32 tmp;
 222
 223         tmp = intel_de_read(i915, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 224         intel_de_write(i915, BLC_PWM_CPU_CTL, tmp | level);
 225 }
 226
 227 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 228 {
 229         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 230         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 231         struct intel_panel *panel = &connector->panel;
 232         u32 tmp, mask;
 233
 234         drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
 235
 236         if (panel->backlight.combination_mode) {
 237                 u8 lbpc;
 238
 239                 lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
 240                 level /= lbpc;
 241                 pci_write_config_byte(to_pci_dev(i915->drm.dev), LBPC, lbpc);
 242         }
 243
 244         if (DISPLAY_VER(i915) == 4) {
 245                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
 246         } else {
 247                 level <<= 1;
 248                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
 249         }
 250
 251         tmp = intel_de_read(i915, BLC_PWM_CTL) & ~mask;
 252         intel_de_write(i915, BLC_PWM_CTL, tmp | level);
 253 }
 254
 255 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 256 {
 257         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 258         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 259         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 260         u32 tmp;
 261
 262         tmp = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 263         intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), tmp | level);
 264 }
 265
 266 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 267 {
 268         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 269         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 270         struct intel_panel *panel = &connector->panel;
 271
 272         intel_de_write(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 273 }
 274
 275 static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 276 {
 277         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 278
 279         pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
 280         pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
 281 }
 282
 283 static void
 284 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 285 {
 286         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 287         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 288         struct intel_panel *panel = &connector->panel;
 289
 290         drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight level = %d\n",
 291                     connector->base.base.id, connector->base.name, level);
 292
 293         panel->backlight.funcs->set(conn_state, level);
 294 }
 295
 296 /* set backlight brightness to level in range [0..max], assuming hw min is
 297  * respected.
 298  */
 299 void intel_backlight_set_acpi(const struct drm_connector_state *conn_state,
 300                               u32 user_level, u32 user_max)
 301 {
 302         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 303         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 304         struct intel_panel *panel = &connector->panel;
 305         u32 hw_level;
 306
 307         /*
 308          * Lack of crtc may occur during driver init because
 309          * connection_mutex isn't held across the entire backlight
 310          * setup + modeset readout, and the BIOS can issue the
 311          * requests at any time.
 312          */
 313         if (!panel->backlight.present || !conn_state->crtc)
 314                 return;
 315
 316         mutex_lock(&i915->display.backlight.lock);
 317
 318         drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
 319
 320         hw_level = clamp_user_to_hw(connector, user_level, user_max);
 321         panel->backlight.level = hw_level;
 322
 323         if (panel->backlight.device)
 324                 panel->backlight.device->props.brightness =
 325                         scale_hw_to_user(connector,
 326                                          panel->backlight.level,
 327                                          panel->backlight.device->props.max_brightness);
 328
 329         if (panel->backlight.enabled)
 330                 intel_panel_actually_set_backlight(conn_state, hw_level);
 331
 332         mutex_unlock(&i915->display.backlight.lock);
 333 }
 334
 335 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
 336 {
 337         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 338         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 339         u32 tmp;
 340
 341         intel_backlight_set_pwm_level(old_conn_state, level);
 342
 343         /*
 344          * Although we don't support or enable CPU PWM with LPT/SPT based
 345          * systems, it may have been enabled prior to loading the
 346          * driver. Disable to avoid warnings on LCPLL disable.
 347          *
 348          * This needs rework if we need to add support for CPU PWM on PCH split
 349          * platforms.
 350          */
 351         tmp = intel_de_read(i915, BLC_PWM_CPU_CTL2);
 352         if (tmp & BLM_PWM_ENABLE) {
 353                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight was enabled, disabling\n",
 354                             connector->base.base.id, connector->base.name);
 355                 intel_de_write(i915, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
 356         }
 357
 358         intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
 359 }
 360
 361 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 362 {
 363         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 364         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 365
 366         intel_backlight_set_pwm_level(old_conn_state, val);
 367
 368         intel_de_rmw(i915, BLC_PWM_CPU_CTL2, BLM_PWM_ENABLE, 0);
 369
 370         intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
 371 }
 372
 373 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 374 {
 375         intel_backlight_set_pwm_level(old_conn_state, val);
 376 }
 377
 378 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 379 {
 380         struct drm_i915_private *i915 = to_i915(old_conn_state->connector->dev);
 381
 382         intel_backlight_set_pwm_level(old_conn_state, val);
 383
 384         intel_de_rmw(i915, BLC_PWM_CTL2, BLM_PWM_ENABLE, 0);
 385 }
 386
 387 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 388 {
 389         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 390         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 391         enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 392
 393         intel_backlight_set_pwm_level(old_conn_state, val);
 394
 395         intel_de_rmw(i915, VLV_BLC_PWM_CTL2(pipe), BLM_PWM_ENABLE, 0);
 396 }
 397
 398 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 399 {
 400         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 401         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 402         struct intel_panel *panel = &connector->panel;
 403
 404         intel_backlight_set_pwm_level(old_conn_state, val);
 405
 406         intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
 407                      BXT_BLC_PWM_ENABLE, 0);
 408
 409         if (panel->backlight.controller == 1)
 410                 intel_de_rmw(i915, UTIL_PIN_CTL, UTIL_PIN_ENABLE, 0);
 411 }
 412
 413 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
 414 {
 415         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 416         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 417         struct intel_panel *panel = &connector->panel;
 418
 419         intel_backlight_set_pwm_level(old_conn_state, val);
 420
 421         intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
 422                      BXT_BLC_PWM_ENABLE, 0);
 423 }
 424
 425 static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
 426 {
 427         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 428         struct intel_panel *panel = &connector->panel;
 429
 430         intel_backlight_set_pwm_level(old_conn_state, level);
 431
 432         panel->backlight.pwm_state.enabled = false;
 433         pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
 434 }
 435
 436 void intel_backlight_disable(const struct drm_connector_state *old_conn_state)
 437 {
 438         struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 439         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 440         struct intel_panel *panel = &connector->panel;
 441
 442         if (!panel->backlight.present)
 443                 return;
 444
 445         /*
 446          * Do not disable backlight on the vga_switcheroo path. When switching
 447          * away from i915, the other client may depend on i915 to handle the
 448          * backlight. This will leave the backlight on unnecessarily when
 449          * another client is not activated.
 450          */
 451         if (i915->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
 452                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Skipping backlight disable on vga switch\n",
 453                             connector->base.base.id, connector->base.name);
 454                 return;
 455         }
 456
 457         mutex_lock(&i915->display.backlight.lock);
 458
 459         if (panel->backlight.device)
 460                 panel->backlight.device->props.power = BACKLIGHT_POWER_OFF;
 461         panel->backlight.enabled = false;
 462         panel->backlight.funcs->disable(old_conn_state, 0);
 463
 464         mutex_unlock(&i915->display.backlight.lock);
 465 }
 466
 467 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
 468                                  const struct drm_connector_state *conn_state, u32 level)
 469 {
 470         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 471         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 472         struct intel_panel *panel = &connector->panel;
 473         u32 pch_ctl1, pch_ctl2;
 474
 475         pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
 476         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 477                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
 478                             connector->base.base.id, connector->base.name);
 479                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 480                 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
 481         }
 482
 483         if (HAS_PCH_LPT(i915))
 484                 intel_de_rmw(i915, SOUTH_CHICKEN2, LPT_PWM_GRANULARITY,
 485                              panel->backlight.alternate_pwm_increment ?
 486                              LPT_PWM_GRANULARITY : 0);
 487         else
 488                 intel_de_rmw(i915, SOUTH_CHICKEN1, SPT_PWM_GRANULARITY,
 489                              panel->backlight.alternate_pwm_increment ?
 490                              SPT_PWM_GRANULARITY : 0);
 491
 492         pch_ctl2 = panel->backlight.pwm_level_max << 16;
 493         intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
 494
 495         pch_ctl1 = 0;
 496         if (panel->backlight.active_low_pwm)
 497                 pch_ctl1 |= BLM_PCH_POLARITY;
 498
 499         /* After LPT, override is the default. */
 500         if (HAS_PCH_LPT(i915))
 501                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
 502
 503         intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
 504         intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
 505         intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 506
 507         /* This won't stick until the above enable. */
 508         intel_backlight_set_pwm_level(conn_state, level);
 509 }
 510
 511 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
 512                                  const struct drm_connector_state *conn_state, u32 level)
 513 {
 514         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 515         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 516         struct intel_panel *panel = &connector->panel;
 517         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 518         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 519
 520         cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
 521         if (cpu_ctl2 & BLM_PWM_ENABLE) {
 522                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight already enabled\n",
 523                             connector->base.base.id, connector->base.name);
 524                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
 525                 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
 526         }
 527
 528         pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
 529         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
 530                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
 531                             connector->base.base.id, connector->base.name);
 532                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
 533                 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
 534         }
 535
 536         if (cpu_transcoder == TRANSCODER_EDP)
 537                 cpu_ctl2 = BLM_TRANSCODER_EDP;
 538         else
 539                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
 540         intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
 541         intel_de_posting_read(i915, BLC_PWM_CPU_CTL2);
 542         intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 543
 544         /* This won't stick until the above enable. */
 545         intel_backlight_set_pwm_level(conn_state, level);
 546
 547         pch_ctl2 = panel->backlight.pwm_level_max << 16;
 548         intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
 549
 550         pch_ctl1 = 0;
 551         if (panel->backlight.active_low_pwm)
 552                 pch_ctl1 |= BLM_PCH_POLARITY;
 553
 554         intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
 555         intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
 556         intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 557 }
 558
 559 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
 560                                   const struct drm_connector_state *conn_state, u32 level)
 561 {
 562         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 563         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 564         struct intel_panel *panel = &connector->panel;
 565         u32 ctl, freq;
 566
 567         ctl = intel_de_read(i915, BLC_PWM_CTL);
 568         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
 569                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
 570                             connector->base.base.id, connector->base.name);
 571                 intel_de_write(i915, BLC_PWM_CTL, 0);
 572         }
 573
 574         freq = panel->backlight.pwm_level_max;
 575         if (panel->backlight.combination_mode)
 576                 freq /= 0xff;
 577
 578         ctl = freq << 17;
 579         if (panel->backlight.combination_mode)
 580                 ctl |= BLM_LEGACY_MODE;
 581         if (IS_PINEVIEW(i915) && panel->backlight.active_low_pwm)
 582                 ctl |= BLM_POLARITY_PNV;
 583
 584         intel_de_write(i915, BLC_PWM_CTL, ctl);
 585         intel_de_posting_read(i915, BLC_PWM_CTL);
 586
 587         /* XXX: combine this into above write? */
 588         intel_backlight_set_pwm_level(conn_state, level);
 589
 590         /*
 591          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
 592          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
 593          * that has backlight.
 594          */
 595         if (DISPLAY_VER(i915) == 2)
 596                 intel_de_write(i915, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 597 }
 598
 599 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
 600                                   const struct drm_connector_state *conn_state, u32 level)
 601 {
 602         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 603         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 604         struct intel_panel *panel = &connector->panel;
 605         enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 606         u32 ctl, ctl2, freq;
 607
 608         ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
 609         if (ctl2 & BLM_PWM_ENABLE) {
 610                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
 611                             connector->base.base.id, connector->base.name);
 612                 ctl2 &= ~BLM_PWM_ENABLE;
 613                 intel_de_write(i915, BLC_PWM_CTL2, ctl2);
 614         }
 615
 616         freq = panel->backlight.pwm_level_max;
 617         if (panel->backlight.combination_mode)
 618                 freq /= 0xff;
 619
 620         ctl = freq << 16;
 621         intel_de_write(i915, BLC_PWM_CTL, ctl);
 622
 623         ctl2 = BLM_PIPE(pipe);
 624         if (panel->backlight.combination_mode)
 625                 ctl2 |= BLM_COMBINATION_MODE;
 626         if (panel->backlight.active_low_pwm)
 627                 ctl2 |= BLM_POLARITY_I965;
 628         intel_de_write(i915, BLC_PWM_CTL2, ctl2);
 629         intel_de_posting_read(i915, BLC_PWM_CTL2);
 630         intel_de_write(i915, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 631
 632         intel_backlight_set_pwm_level(conn_state, level);
 633 }
 634
 635 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
 636                                  const struct drm_connector_state *conn_state, u32 level)
 637 {
 638         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 639         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 640         struct intel_panel *panel = &connector->panel;
 641         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
 642         u32 ctl, ctl2;
 643
 644         ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
 645         if (ctl2 & BLM_PWM_ENABLE) {
 646                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
 647                             connector->base.base.id, connector->base.name);
 648                 ctl2 &= ~BLM_PWM_ENABLE;
 649                 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
 650         }
 651
 652         ctl = panel->backlight.pwm_level_max << 16;
 653         intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), ctl);
 654
 655         /* XXX: combine this into above write? */
 656         intel_backlight_set_pwm_level(conn_state, level);
 657
 658         ctl2 = 0;
 659         if (panel->backlight.active_low_pwm)
 660                 ctl2 |= BLM_POLARITY_I965;
 661         intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
 662         intel_de_posting_read(i915, VLV_BLC_PWM_CTL2(pipe));
 663         intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 664 }
 665
 666 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
 667                                  const struct drm_connector_state *conn_state, u32 level)
 668 {
 669         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 670         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 671         struct intel_panel *panel = &connector->panel;
 672         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
 673         u32 pwm_ctl, val;
 674
 675         /* Controller 1 uses the utility pin. */
 676         if (panel->backlight.controller == 1) {
 677                 val = intel_de_read(i915, UTIL_PIN_CTL);
 678                 if (val & UTIL_PIN_ENABLE) {
 679                         drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] utility pin already enabled\n",
 680                                     connector->base.base.id, connector->base.name);
 681                         val &= ~UTIL_PIN_ENABLE;
 682                         intel_de_write(i915, UTIL_PIN_CTL, val);
 683                 }
 684
 685                 val = 0;
 686                 if (panel->backlight.util_pin_active_low)
 687                         val |= UTIL_PIN_POLARITY;
 688                 intel_de_write(i915, UTIL_PIN_CTL,
 689                                val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
 690         }
 691
 692         pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
 693         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
 694                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
 695                             connector->base.base.id, connector->base.name);
 696                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
 697                 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
 698                                pwm_ctl);
 699         }
 700
 701         intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
 702                        panel->backlight.pwm_level_max);
 703
 704         intel_backlight_set_pwm_level(conn_state, level);
 705
 706         pwm_ctl = 0;
 707         if (panel->backlight.active_low_pwm)
 708                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
 709
 710         intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
 711         intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
 712         intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
 713                        pwm_ctl | BXT_BLC_PWM_ENABLE);
 714 }
 715
 716 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
 717                                  const struct drm_connector_state *conn_state, u32 level)
 718 {
 719         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 720         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 721         struct intel_panel *panel = &connector->panel;
 722         u32 pwm_ctl;
 723
 724         pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
 725         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
 726                 drm_dbg_kms(&i915->drm, "backlight already enabled\n");
 727                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
 728                 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
 729                                pwm_ctl);
 730         }
 731
 732         intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
 733                        panel->backlight.pwm_level_max);
 734
 735         intel_backlight_set_pwm_level(conn_state, level);
 736
 737         pwm_ctl = 0;
 738         if (panel->backlight.active_low_pwm)
 739                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
 740
 741         intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
 742         intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
 743         intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
 744                        pwm_ctl | BXT_BLC_PWM_ENABLE);
 745 }
 746
 747 static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
 748                                      const struct drm_connector_state *conn_state, u32 level)
 749 {
 750         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 751         struct intel_panel *panel = &connector->panel;
 752
 753         pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
 754         panel->backlight.pwm_state.enabled = true;
 755         pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
 756 }
 757
 758 static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state,
 759                                      const struct drm_connector_state *conn_state)
 760 {
 761         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 762         struct intel_panel *panel = &connector->panel;
 763
 764         WARN_ON(panel->backlight.max == 0);
 765
 766         if (panel->backlight.level < panel->backlight.min) {
 767                 panel->backlight.level = panel->backlight.min;
 768                 if (panel->backlight.device)
 769                         panel->backlight.device->props.brightness =
 770                                 scale_hw_to_user(connector,
 771                                                  panel->backlight.level,
 772                                                  panel->backlight.device->props.max_brightness);
 773         }
 774
 775         panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
 776         panel->backlight.enabled = true;
 777         if (panel->backlight.device)
 778                 panel->backlight.device->props.power = BACKLIGHT_POWER_ON;
 779 }
 780
 781 void intel_backlight_enable(const struct intel_crtc_state *crtc_state,
 782                             const struct drm_connector_state *conn_state)
 783 {
 784         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 785         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 786         struct intel_panel *panel = &connector->panel;
 787         enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
 788
 789         if (!panel->backlight.present)
 790                 return;
 791
 792         drm_dbg_kms(&i915->drm, "pipe %c\n", pipe_name(pipe));
 793
 794         mutex_lock(&i915->display.backlight.lock);
 795
 796         __intel_backlight_enable(crtc_state, conn_state);
 797
 798         mutex_unlock(&i915->display.backlight.lock);
 799 }
 800
 801 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 802 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 803 {
 804         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 805         struct intel_panel *panel = &connector->panel;
 806         u32 val = 0;
 807
 808         mutex_lock(&i915->display.backlight.lock);
 809
 810         if (panel->backlight.enabled)
 811                 val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
 812
 813         mutex_unlock(&i915->display.backlight.lock);
 814
 815         drm_dbg_kms(&i915->drm, "get backlight PWM = %d\n", val);
 816         return val;
 817 }
 818
 819 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
 820 static u32 scale_user_to_hw(struct intel_connector *connector,
 821                             u32 user_level, u32 user_max)
 822 {
 823         struct intel_panel *panel = &connector->panel;
 824
 825         return scale(user_level, 0, user_max,
 826                      panel->backlight.min, panel->backlight.max);
 827 }
 828
 829 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
 830 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
 831                                       u32 user_level, u32 user_max)
 832 {
 833         struct intel_connector *connector = to_intel_connector(conn_state->connector);
 834         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 835         struct intel_panel *panel = &connector->panel;
 836         u32 hw_level;
 837
 838         if (!panel->backlight.present)
 839                 return;
 840
 841         mutex_lock(&i915->display.backlight.lock);
 842
 843         drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
 844
 845         hw_level = scale_user_to_hw(connector, user_level, user_max);
 846         panel->backlight.level = hw_level;
 847
 848         if (panel->backlight.enabled)
 849                 intel_panel_actually_set_backlight(conn_state, hw_level);
 850
 851         mutex_unlock(&i915->display.backlight.lock);
 852 }
 853
 854 static int intel_backlight_device_update_status(struct backlight_device *bd)
 855 {
 856         struct intel_connector *connector = bl_get_data(bd);
 857         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 858         struct intel_panel *panel = &connector->panel;
 859
 860         drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
 861
 862         drm_dbg_kms(&i915->drm, "updating intel_backlight, brightness=%d/%d\n",
 863                     bd->props.brightness, bd->props.max_brightness);
 864         intel_panel_set_backlight(connector->base.state, bd->props.brightness,
 865                                   bd->props.max_brightness);
 866
 867         /*
 868          * Allow flipping bl_power as a sub-state of enabled. Sadly the
 869          * backlight class device does not make it easy to differentiate
 870          * between callbacks for brightness and bl_power, so our backlight_power
 871          * callback needs to take this into account.
 872          */
 873         if (panel->backlight.enabled) {
 874                 if (panel->backlight.power) {
 875                         bool enable = bd->props.power == BACKLIGHT_POWER_ON &&
 876                                 bd->props.brightness != 0;
 877                         panel->backlight.power(connector, enable);
 878                 }
 879         } else {
 880                 bd->props.power = BACKLIGHT_POWER_OFF;
 881         }
 882
 883         drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
 884
 885         return 0;
 886 }
 887
 888 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
 889 {
 890         struct intel_connector *connector = bl_get_data(bd);
 891         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 892         intel_wakeref_t wakeref;
 893         int ret = 0;
 894
 895         with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
 896                 u32 hw_level;
 897
 898                 drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
 899
 900                 hw_level = intel_panel_get_backlight(connector);
 901                 ret = scale_hw_to_user(connector,
 902                                        hw_level, bd->props.max_brightness);
 903
 904                 drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
 905         }
 906
 907         return ret;
 908 }
 909
 910 static const struct backlight_ops intel_backlight_device_ops = {
 911         .update_status = intel_backlight_device_update_status,
 912         .get_brightness = intel_backlight_device_get_brightness,
 913 };
 914
 915 int intel_backlight_device_register(struct intel_connector *connector)
 916 {
 917         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 918         struct intel_panel *panel = &connector->panel;
 919         struct backlight_properties props;
 920         struct backlight_device *bd;
 921         const char *name;
 922         int ret = 0;
 923
 924         if (WARN_ON(panel->backlight.device))
 925                 return -ENODEV;
 926
 927         if (!panel->backlight.present)
 928                 return 0;
 929
 930         WARN_ON(panel->backlight.max == 0);
 931
 932         if (!acpi_video_backlight_use_native()) {
 933                 drm_info(&i915->drm, "Skipping intel_backlight registration\n");
 934                 return 0;
 935         }
 936
 937         memset(&props, 0, sizeof(props));
 938         props.type = BACKLIGHT_RAW;
 939
 940         /*
 941          * Note: Everything should work even if the backlight device max
 942          * presented to the userspace is arbitrarily chosen.
 943          */
 944         props.max_brightness = panel->backlight.max;
 945         props.brightness = scale_hw_to_user(connector,
 946                                             panel->backlight.level,
 947                                             props.max_brightness);
 948
 949         if (panel->backlight.enabled)
 950                 props.power = BACKLIGHT_POWER_ON;
 951         else
 952                 props.power = BACKLIGHT_POWER_OFF;
 953
 954         name = kstrdup("intel_backlight", GFP_KERNEL);
 955         if (!name)
 956                 return -ENOMEM;
 957
 958         bd = backlight_device_get_by_name(name);
 959         if (bd) {
 960                 put_device(&bd->dev);
 961                 /*
 962                  * Using the same name independent of the drm device or connector
 963                  * prevents registration of multiple backlight devices in the
 964                  * driver. However, we need to use the default name for backward
 965                  * compatibility. Use unique names for subsequent backlight devices as a
 966                  * fallback when the default name already exists.
 967                  */
 968                 kfree(name);
 969                 name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
 970                                  i915->drm.primary->index, connector->base.name);
 971                 if (!name)
 972                         return -ENOMEM;
 973         }
 974         bd = backlight_device_register(name, connector->base.kdev, connector,
 975                                        &intel_backlight_device_ops, &props);
 976
 977         if (IS_ERR(bd)) {
 978                 drm_err(&i915->drm,
 979                         "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
 980                         connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
 981                 ret = PTR_ERR(bd);
 982                 goto out;
 983         }
 984
 985         panel->backlight.device = bd;
 986
 987         drm_dbg_kms(&i915->drm,
 988                     "[CONNECTOR:%d:%s] backlight device %s registered\n",
 989                     connector->base.base.id, connector->base.name, name);
 990
 991 out:
 992         kfree(name);
 993
 994         return ret;
 995 }
 996
 997 void intel_backlight_device_unregister(struct intel_connector *connector)
 998 {
 999         struct intel_panel *panel = &connector->panel;
1000
1001         if (panel->backlight.device) {
1002                 backlight_device_unregister(panel->backlight.device);
1003                 panel->backlight.device = NULL;
1004         }
1005 }
1006 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1007
1008 /*
1009  * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1010  *      PWM increment = 1
1011  */
1012 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1013 {
1014         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1015
1016         return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),
1017                                  pwm_freq_hz);
1018 }
1019
1020 /*
1021  * BXT: PWM clock frequency = 19.2 MHz.
1022  */
1023 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1024 {
1025         return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1026 }
1027
1028 /*
1029  * SPT: This value represents the period of the PWM stream in clock periods
1030  * multiplied by 16 (default increment) or 128 (alternate increment selected in
1031  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1032  */
1033 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1034 {
1035         struct intel_panel *panel = &connector->panel;
1036         u32 mul;
1037
1038         if (panel->backlight.alternate_pwm_increment)
1039                 mul = 128;
1040         else
1041                 mul = 16;
1042
1043         return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1044 }
1045
1046 /*
1047  * LPT: This value represents the period of the PWM stream in clock periods
1048  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1049  * LPT SOUTH_CHICKEN2 register bit 5).
1050  */
1051 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1052 {
1053         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1054         struct intel_panel *panel = &connector->panel;
1055         u32 mul, clock;
1056
1057         if (panel->backlight.alternate_pwm_increment)
1058                 mul = 16;
1059         else
1060                 mul = 128;
1061
1062         if (HAS_PCH_LPT_H(i915))
1063                 clock = MHz(135); /* LPT:H */
1064         else
1065                 clock = MHz(24); /* LPT:LP */
1066
1067         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1068 }
1069
1070 /*
1071  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1072  * display raw clocks multiplied by 128.
1073  */
1074 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1075 {
1076         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1077
1078         return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),
1079                                  pwm_freq_hz * 128);
1080 }
1081
1082 /*
1083  * Gen2: This field determines the number of time base events (display core
1084  * clock frequency/32) in total for a complete cycle of modulated backlight
1085  * control.
1086  *
1087  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1088  * divided by 32.
1089  */
1090 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1091 {
1092         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1093         int clock;
1094
1095         if (IS_PINEVIEW(i915))
1096                 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
1097         else
1098                 clock = KHz(i915->display.cdclk.hw.cdclk);
1099
1100         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1101 }
1102
1103 /*
1104  * Gen4: This value represents the period of the PWM stream in display core
1105  * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1106  *
1107  */
1108 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1109 {
1110         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1111         int clock;
1112
1113         if (IS_G4X(i915))
1114                 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
1115         else
1116                 clock = KHz(i915->display.cdclk.hw.cdclk);
1117
1118         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1119 }
1120
1121 /*
1122  * VLV: This value represents the period of the PWM stream in display core
1123  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1124  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1125  */
1126 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1127 {
1128         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1129         int mul, clock;
1130
1131         if ((intel_de_read(i915, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1132                 if (IS_CHERRYVIEW(i915))
1133                         clock = KHz(19200);
1134                 else
1135                         clock = MHz(25);
1136                 mul = 16;
1137         } else {
1138                 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
1139                 mul = 128;
1140         }
1141
1142         return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1143 }
1144
1145 static u16 get_vbt_pwm_freq(struct intel_connector *connector)
1146 {
1147         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1148         u16 pwm_freq_hz = connector->panel.vbt.backlight.pwm_freq_hz;
1149
1150         if (pwm_freq_hz) {
1151                 drm_dbg_kms(&i915->drm,
1152                             "VBT defined backlight frequency %u Hz\n",
1153                             pwm_freq_hz);
1154         } else {
1155                 pwm_freq_hz = 200;
1156                 drm_dbg_kms(&i915->drm,
1157                             "default backlight frequency %u Hz\n",
1158                             pwm_freq_hz);
1159         }
1160
1161         return pwm_freq_hz;
1162 }
1163
1164 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1165 {
1166         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1167         struct intel_panel *panel = &connector->panel;
1168         u16 pwm_freq_hz = get_vbt_pwm_freq(connector);
1169         u32 pwm;
1170
1171         if (!panel->backlight.pwm_funcs->hz_to_pwm) {
1172                 drm_dbg_kms(&i915->drm,
1173                             "backlight frequency conversion not supported\n");
1174                 return 0;
1175         }
1176
1177         pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
1178         if (!pwm) {
1179                 drm_dbg_kms(&i915->drm,
1180                             "backlight frequency conversion failed\n");
1181                 return 0;
1182         }
1183
1184         return pwm;
1185 }
1186
1187 /*
1188  * Note: The setup hooks can't assume pipe is set!
1189  */
1190 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1191 {
1192         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1193         struct intel_panel *panel = &connector->panel;
1194         int min;
1195
1196         drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
1197
1198         /*
1199          * XXX: If the vbt value is 255, it makes min equal to max, which leads
1200          * to problems. There are such machines out there. Either our
1201          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1202          * against this by letting the minimum be at most (arbitrarily chosen)
1203          * 25% of the max.
1204          */
1205         min = clamp_t(int, connector->panel.vbt.backlight.min_brightness, 0, 64);
1206         if (min != connector->panel.vbt.backlight.min_brightness) {
1207                 drm_dbg_kms(&i915->drm,
1208                             "clamping VBT min backlight %d/255 to %d/255\n",
1209                             connector->panel.vbt.backlight.min_brightness, min);
1210         }
1211
1212         /* vbt value is a coefficient in range [0..255] */
1213         return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
1214 }
1215
1216 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1217 {
1218         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1219         struct intel_panel *panel = &connector->panel;
1220         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1221         bool alt, cpu_mode;
1222
1223         if (HAS_PCH_LPT(i915))
1224                 alt = intel_de_read(i915, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1225         else
1226                 alt = intel_de_read(i915, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1227         panel->backlight.alternate_pwm_increment = alt;
1228
1229         pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
1230         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1231
1232         pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
1233         panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1234
1235         cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
1236
1237         if (!panel->backlight.pwm_level_max)
1238                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1239
1240         if (!panel->backlight.pwm_level_max)
1241                 return -ENODEV;
1242
1243         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1244
1245         panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1246
1247         cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(i915) &&
1248                    !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1249                    (cpu_ctl2 & BLM_PWM_ENABLE);
1250
1251         if (cpu_mode) {
1252                 val = pch_get_backlight(connector, unused);
1253
1254                 drm_dbg_kms(&i915->drm,
1255                             "CPU backlight register was enabled, switching to PCH override\n");
1256
1257                 /* Write converted CPU PWM value to PCH override register */
1258                 lpt_set_backlight(connector->base.state, val);
1259                 intel_de_write(i915, BLC_PWM_PCH_CTL1,
1260                                pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1261
1262                 intel_de_write(i915, BLC_PWM_CPU_CTL2,
1263                                cpu_ctl2 & ~BLM_PWM_ENABLE);
1264         }
1265
1266         drm_dbg_kms(&i915->drm,
1267                     "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
1268                     connector->base.base.id, connector->base.name);
1269
1270         return 0;
1271 }
1272
1273 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1274 {
1275         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1276         struct intel_panel *panel = &connector->panel;
1277         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
1278
1279         pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
1280         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1281
1282         pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
1283         panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1284
1285         if (!panel->backlight.pwm_level_max)
1286                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1287
1288         if (!panel->backlight.pwm_level_max)
1289                 return -ENODEV;
1290
1291         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1292
1293         cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
1294         panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1295                 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1296
1297         drm_dbg_kms(&i915->drm,
1298                     "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
1299                     connector->base.base.id, connector->base.name);
1300
1301         return 0;
1302 }
1303
1304 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1305 {
1306         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1307         struct intel_panel *panel = &connector->panel;
1308         u32 ctl, val;
1309
1310         ctl = intel_de_read(i915, BLC_PWM_CTL);
1311
1312         if (DISPLAY_VER(i915) == 2 || IS_I915GM(i915) || IS_I945GM(i915))
1313                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1314
1315         if (IS_PINEVIEW(i915))
1316                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1317
1318         panel->backlight.pwm_level_max = ctl >> 17;
1319
1320         if (!panel->backlight.pwm_level_max) {
1321                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1322                 panel->backlight.pwm_level_max >>= 1;
1323         }
1324
1325         if (!panel->backlight.pwm_level_max)
1326                 return -ENODEV;
1327
1328         if (panel->backlight.combination_mode)
1329                 panel->backlight.pwm_level_max *= 0xff;
1330
1331         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1332
1333         val = i9xx_get_backlight(connector, unused);
1334         val = intel_backlight_invert_pwm_level(connector, val);
1335         val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
1336
1337         panel->backlight.pwm_enabled = val != 0;
1338
1339         drm_dbg_kms(&i915->drm,
1340                     "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
1341                     connector->base.base.id, connector->base.name);
1342
1343         return 0;
1344 }
1345
1346 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1347 {
1348         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1349         struct intel_panel *panel = &connector->panel;
1350         u32 ctl, ctl2;
1351
1352         ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
1353         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1354         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1355
1356         ctl = intel_de_read(i915, BLC_PWM_CTL);
1357         panel->backlight.pwm_level_max = ctl >> 16;
1358
1359         if (!panel->backlight.pwm_level_max)
1360                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1361
1362         if (!panel->backlight.pwm_level_max)
1363                 return -ENODEV;
1364
1365         if (panel->backlight.combination_mode)
1366                 panel->backlight.pwm_level_max *= 0xff;
1367
1368         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1369
1370         panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1371
1372         drm_dbg_kms(&i915->drm,
1373                     "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
1374                     connector->base.base.id, connector->base.name);
1375
1376         return 0;
1377 }
1378
1379 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1380 {
1381         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1382         struct intel_panel *panel = &connector->panel;
1383         u32 ctl, ctl2;
1384
1385         if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
1386                 return -ENODEV;
1387
1388         ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
1389         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1390
1391         ctl = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe));
1392         panel->backlight.pwm_level_max = ctl >> 16;
1393
1394         if (!panel->backlight.pwm_level_max)
1395                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1396
1397         if (!panel->backlight.pwm_level_max)
1398                 return -ENODEV;
1399
1400         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1401
1402         panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1403
1404         drm_dbg_kms(&i915->drm,
1405                     "[CONNECTOR:%d:%s] Using native PWM for backlight control (on pipe %c)\n",
1406                     connector->base.base.id, connector->base.name, pipe_name(pipe));
1407
1408         return 0;
1409 }
1410
1411 static int
1412 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1413 {
1414         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1415         struct intel_panel *panel = &connector->panel;
1416         u32 pwm_ctl, val;
1417
1418         panel->backlight.controller = connector->panel.vbt.backlight.controller;
1419
1420         pwm_ctl = intel_de_read(i915,
1421                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1422
1423         /* Controller 1 uses the utility pin. */
1424         if (panel->backlight.controller == 1) {
1425                 val = intel_de_read(i915, UTIL_PIN_CTL);
1426                 panel->backlight.util_pin_active_low =
1427                                         val & UTIL_PIN_POLARITY;
1428         }
1429
1430         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1431         panel->backlight.pwm_level_max =
1432                 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1433
1434         if (!panel->backlight.pwm_level_max)
1435                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1436
1437         if (!panel->backlight.pwm_level_max)
1438                 return -ENODEV;
1439
1440         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1441
1442         panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1443
1444         drm_dbg_kms(&i915->drm,
1445                     "[CONNECTOR:%d:%s] Using native PWM for backlight control (controller=%d)\n",
1446                     connector->base.base.id, connector->base.name,
1447                     panel->backlight.controller);
1448
1449         return 0;
1450 }
1451
1452 static int cnp_num_backlight_controllers(struct drm_i915_private *i915)
1453 {
1454         if (INTEL_PCH_TYPE(i915) >= PCH_MTL)
1455                 return 2;
1456
1457         if (INTEL_PCH_TYPE(i915) >= PCH_DG1)
1458                 return 1;
1459
1460         if (INTEL_PCH_TYPE(i915) >= PCH_ICP)
1461                 return 2;
1462
1463         return 1;
1464 }
1465
1466 static bool cnp_backlight_controller_is_valid(struct drm_i915_private *i915, int controller)
1467 {
1468         if (controller < 0 || controller >= cnp_num_backlight_controllers(i915))
1469                 return false;
1470
1471         if (controller == 1 &&
1472             INTEL_PCH_TYPE(i915) >= PCH_ICP &&
1473             INTEL_PCH_TYPE(i915) <= PCH_ADP)
1474                 return intel_de_read(i915, SOUTH_CHICKEN1) & ICP_SECOND_PPS_IO_SELECT;
1475
1476         return true;
1477 }
1478
1479 static int
1480 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1481 {
1482         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1483         struct intel_panel *panel = &connector->panel;
1484         u32 pwm_ctl;
1485
1486         /*
1487          * CNP has the BXT implementation of backlight, but with only one
1488          * controller. ICP+ can have two controllers, depending on pin muxing.
1489          */
1490         panel->backlight.controller = connector->panel.vbt.backlight.controller;
1491         if (!cnp_backlight_controller_is_valid(i915, panel->backlight.controller)) {
1492                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Invalid backlight controller %d, assuming 0\n",
1493                             connector->base.base.id, connector->base.name,
1494                             panel->backlight.controller);
1495                 panel->backlight.controller = 0;
1496         }
1497
1498         pwm_ctl = intel_de_read(i915,
1499                                 BXT_BLC_PWM_CTL(panel->backlight.controller));
1500
1501         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1502         panel->backlight.pwm_level_max =
1503                 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1504
1505         if (!panel->backlight.pwm_level_max)
1506                 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1507
1508         if (!panel->backlight.pwm_level_max)
1509                 return -ENODEV;
1510
1511         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1512
1513         panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1514
1515         drm_dbg_kms(&i915->drm,
1516                     "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control (controller=%d)\n",
1517                     connector->base.base.id, connector->base.name,
1518                     panel->backlight.controller);
1519
1520         return 0;
1521 }
1522
1523 static int ext_pwm_setup_backlight(struct intel_connector *connector,
1524                                    enum pipe pipe)
1525 {
1526         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1527         struct intel_panel *panel = &connector->panel;
1528         const char *desc;
1529         u32 level;
1530
1531         /* Get the right PWM chip for DSI backlight according to VBT */
1532         if (connector->panel.vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1533                 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_pmic_backlight");
1534                 desc = "PMIC";
1535         } else {
1536                 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_soc_backlight");
1537                 desc = "SoC";
1538         }
1539
1540         if (IS_ERR(panel->backlight.pwm)) {
1541                 drm_err(&i915->drm, "[CONNECTOR:%d:%s] Failed to get the %s PWM chip\n",
1542                         connector->base.base.id, connector->base.name, desc);
1543                 panel->backlight.pwm = NULL;
1544                 return -ENODEV;
1545         }
1546
1547         panel->backlight.pwm_level_max = 100; /* 100% */
1548         panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1549
1550         if (pwm_is_enabled(panel->backlight.pwm)) {
1551                 /* PWM is already enabled, use existing settings */
1552                 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1553
1554                 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
1555                                                     100);
1556                 level = intel_backlight_invert_pwm_level(connector, level);
1557                 panel->backlight.pwm_enabled = true;
1558
1559                 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PWM already enabled at freq %ld, VBT freq %d, level %d\n",
1560                             connector->base.base.id, connector->base.name,
1561                             NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
1562                             get_vbt_pwm_freq(connector), level);
1563         } else {
1564                 /* Set period from VBT frequency, leave other settings at 0. */
1565                 panel->backlight.pwm_state.period =
1566                         NSEC_PER_SEC / get_vbt_pwm_freq(connector);
1567         }
1568
1569         drm_dbg_kms(&i915->drm,
1570                     "[CONNECTOR:%d:%s] Using %s PWM for backlight control\n",
1571                     connector->base.base.id, connector->base.name, desc);
1572
1573         return 0;
1574 }
1575
1576 static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
1577 {
1578         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1579         struct intel_panel *panel = &connector->panel;
1580
1581         panel->backlight.pwm_funcs->set(conn_state,
1582                                         intel_backlight_invert_pwm_level(connector, level));
1583 }
1584
1585 static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
1586 {
1587         struct intel_panel *panel = &connector->panel;
1588
1589         return intel_backlight_invert_pwm_level(connector,
1590                                             panel->backlight.pwm_funcs->get(connector, pipe));
1591 }
1592
1593 static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1594                                        const struct drm_connector_state *conn_state, u32 level)
1595 {
1596         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1597         struct intel_panel *panel = &connector->panel;
1598
1599         panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
1600                                            intel_backlight_invert_pwm_level(connector, level));
1601 }
1602
1603 static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
1604 {
1605         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1606         struct intel_panel *panel = &connector->panel;
1607
1608         panel->backlight.pwm_funcs->disable(conn_state,
1609                                             intel_backlight_invert_pwm_level(connector, level));
1610 }
1611
1612 static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1613 {
1614         struct intel_panel *panel = &connector->panel;
1615         int ret;
1616
1617         ret = panel->backlight.pwm_funcs->setup(connector, pipe);
1618         if (ret < 0)
1619                 return ret;
1620
1621         panel->backlight.min = panel->backlight.pwm_level_min;
1622         panel->backlight.max = panel->backlight.pwm_level_max;
1623         panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
1624         panel->backlight.enabled = panel->backlight.pwm_enabled;
1625
1626         return 0;
1627 }
1628
1629 void intel_backlight_update(struct intel_atomic_state *state,
1630                             struct intel_encoder *encoder,
1631                             const struct intel_crtc_state *crtc_state,
1632                             const struct drm_connector_state *conn_state)
1633 {
1634         struct intel_connector *connector = to_intel_connector(conn_state->connector);
1635         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1636         struct intel_panel *panel = &connector->panel;
1637
1638         if (!panel->backlight.present)
1639                 return;
1640
1641         mutex_lock(&i915->display.backlight.lock);
1642         if (!panel->backlight.enabled)
1643                 __intel_backlight_enable(crtc_state, conn_state);
1644
1645         mutex_unlock(&i915->display.backlight.lock);
1646 }
1647
1648 int intel_backlight_setup(struct intel_connector *connector, enum pipe pipe)
1649 {
1650         struct intel_display *display = to_intel_display(connector);
1651         struct intel_panel *panel = &connector->panel;
1652         int ret;
1653
1654         if (!connector->panel.vbt.backlight.present) {
1655                 if (intel_has_quirk(display, QUIRK_BACKLIGHT_PRESENT)) {
1656                         drm_dbg_kms(display->drm,
1657                                     "[CONNECTOR:%d:%s] no backlight present per VBT, but present per quirk\n",
1658                                     connector->base.base.id, connector->base.name);
1659                 } else {
1660                         drm_dbg_kms(display->drm,
1661                                     "[CONNECTOR:%d:%s] no backlight present per VBT\n",
1662                                     connector->base.base.id, connector->base.name);
1663                         return 0;
1664                 }
1665         }
1666
1667         /* ensure intel_panel has been initialized first */
1668         if (drm_WARN_ON(display->drm, !panel->backlight.funcs))
1669                 return -ENODEV;
1670
1671         /* set level and max in panel struct */
1672         mutex_lock(&display->backlight.lock);
1673         ret = panel->backlight.funcs->setup(connector, pipe);
1674         mutex_unlock(&display->backlight.lock);
1675
1676         if (ret) {
1677                 drm_dbg_kms(display->drm,
1678                             "[CONNECTOR:%d:%s] failed to setup backlight\n",
1679                             connector->base.base.id, connector->base.name);
1680                 return ret;
1681         }
1682
1683         panel->backlight.present = true;
1684
1685         drm_dbg_kms(display->drm,
1686                     "[CONNECTOR:%d:%s] backlight initialized, %s, brightness %u/%u\n",
1687                     connector->base.base.id, connector->base.name,
1688                     str_enabled_disabled(panel->backlight.enabled),
1689                     panel->backlight.level, panel->backlight.max);
1690
1691         return 0;
1692 }
1693
1694 void intel_backlight_destroy(struct intel_panel *panel)
1695 {
1696         /* dispose of the pwm */
1697         if (panel->backlight.pwm)
1698                 pwm_put(panel->backlight.pwm);
1699
1700         panel->backlight.present = false;
1701 }
1702
1703 static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
1704         .setup = bxt_setup_backlight,
1705         .enable = bxt_enable_backlight,
1706         .disable = bxt_disable_backlight,
1707         .set = bxt_set_backlight,
1708         .get = bxt_get_backlight,
1709         .hz_to_pwm = bxt_hz_to_pwm,
1710 };
1711
1712 static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
1713         .setup = cnp_setup_backlight,
1714         .enable = cnp_enable_backlight,
1715         .disable = cnp_disable_backlight,
1716         .set = bxt_set_backlight,
1717         .get = bxt_get_backlight,
1718         .hz_to_pwm = cnp_hz_to_pwm,
1719 };
1720
1721 static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
1722         .setup = lpt_setup_backlight,
1723         .enable = lpt_enable_backlight,
1724         .disable = lpt_disable_backlight,
1725         .set = lpt_set_backlight,
1726         .get = lpt_get_backlight,
1727         .hz_to_pwm = lpt_hz_to_pwm,
1728 };
1729
1730 static const struct intel_panel_bl_funcs spt_pwm_funcs = {
1731         .setup = lpt_setup_backlight,
1732         .enable = lpt_enable_backlight,
1733         .disable = lpt_disable_backlight,
1734         .set = lpt_set_backlight,
1735         .get = lpt_get_backlight,
1736         .hz_to_pwm = spt_hz_to_pwm,
1737 };
1738
1739 static const struct intel_panel_bl_funcs pch_pwm_funcs = {
1740         .setup = pch_setup_backlight,
1741         .enable = pch_enable_backlight,
1742         .disable = pch_disable_backlight,
1743         .set = pch_set_backlight,
1744         .get = pch_get_backlight,
1745         .hz_to_pwm = pch_hz_to_pwm,
1746 };
1747
1748 static const struct intel_panel_bl_funcs ext_pwm_funcs = {
1749         .setup = ext_pwm_setup_backlight,
1750         .enable = ext_pwm_enable_backlight,
1751         .disable = ext_pwm_disable_backlight,
1752         .set = ext_pwm_set_backlight,
1753         .get = ext_pwm_get_backlight,
1754 };
1755
1756 static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
1757         .setup = vlv_setup_backlight,
1758         .enable = vlv_enable_backlight,
1759         .disable = vlv_disable_backlight,
1760         .set = vlv_set_backlight,
1761         .get = vlv_get_backlight,
1762         .hz_to_pwm = vlv_hz_to_pwm,
1763 };
1764
1765 static const struct intel_panel_bl_funcs i965_pwm_funcs = {
1766         .setup = i965_setup_backlight,
1767         .enable = i965_enable_backlight,
1768         .disable = i965_disable_backlight,
1769         .set = i9xx_set_backlight,
1770         .get = i9xx_get_backlight,
1771         .hz_to_pwm = i965_hz_to_pwm,
1772 };
1773
1774 static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
1775         .setup = i9xx_setup_backlight,
1776         .enable = i9xx_enable_backlight,
1777         .disable = i9xx_disable_backlight,
1778         .set = i9xx_set_backlight,
1779         .get = i9xx_get_backlight,
1780         .hz_to_pwm = i9xx_hz_to_pwm,
1781 };
1782
1783 static const struct intel_panel_bl_funcs pwm_bl_funcs = {
1784         .setup = intel_pwm_setup_backlight,
1785         .enable = intel_pwm_enable_backlight,
1786         .disable = intel_pwm_disable_backlight,
1787         .set = intel_pwm_set_backlight,
1788         .get = intel_pwm_get_backlight,
1789 };
1790
1791 /* Set up chip specific backlight functions */
1792 void intel_backlight_init_funcs(struct intel_panel *panel)
1793 {
1794         struct intel_connector *connector =
1795                 container_of(panel, struct intel_connector, panel);
1796         struct drm_i915_private *i915 = to_i915(connector->base.dev);
1797
1798         if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1799             intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1800                 return;
1801
1802         if (IS_GEMINILAKE(i915) || IS_BROXTON(i915)) {
1803                 panel->backlight.pwm_funcs = &bxt_pwm_funcs;
1804         } else if (INTEL_PCH_TYPE(i915) >= PCH_CNP) {
1805                 panel->backlight.pwm_funcs = &cnp_pwm_funcs;
1806         } else if (INTEL_PCH_TYPE(i915) >= PCH_LPT) {
1807                 if (HAS_PCH_LPT(i915))
1808                         panel->backlight.pwm_funcs = &lpt_pwm_funcs;
1809                 else
1810                         panel->backlight.pwm_funcs = &spt_pwm_funcs;
1811         } else if (HAS_PCH_SPLIT(i915)) {
1812                 panel->backlight.pwm_funcs = &pch_pwm_funcs;
1813         } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
1814                 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1815                         panel->backlight.pwm_funcs = &ext_pwm_funcs;
1816                 } else {
1817                         panel->backlight.pwm_funcs = &vlv_pwm_funcs;
1818                 }
1819         } else if (DISPLAY_VER(i915) == 4) {
1820                 panel->backlight.pwm_funcs = &i965_pwm_funcs;
1821         } else {
1822                 panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
1823         }
1824
1825         if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
1826                 if (intel_dp_aux_init_backlight_funcs(connector) == 0)
1827                         return;
1828
1829                 if (!intel_has_quirk(&i915->display, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
1830                         connector->panel.backlight.power = intel_pps_backlight_power;
1831         }
1832
1833         /* We're using a standard PWM backlight interface */
1834         panel->backlight.funcs = &pwm_bl_funcs;
1835 }