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