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