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