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