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