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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2021 Intel Corporation4 */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 another28 * @source_val: value in range [@source_min..@source_max]29 * @source_min: minimum legal value for @source_val30 * @source_max: maximum legal value for @source_val31 * @target_min: corresponding target value for @source_min32 * @target_max: corresponding target value for @source_max33 *34 * Return @source_val in range [@source_min..@source_max] scaled to range35 * [@target_min..@target_max].36 */37static u32 scale(u32 source_val,38 u32 source_min, u32 source_max,39 u32 target_min, u32 target_max)40{41 u64 target_val;42 43 WARN_ON(source_min > source_max);44 WARN_ON(target_min > target_max);45 46 /* defensive */47 source_val = clamp(source_val, source_min, source_max);48 49 /* avoid overflows */50 target_val = mul_u32_u32(source_val - source_min,51 target_max - target_min);52 target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);53 target_val += target_min;54 55 return target_val;56}57 58/*59 * Scale user_level in range [0..user_max] to [0..hw_max], clamping the result60 * to [hw_min..hw_max].61 */62static u32 clamp_user_to_hw(struct intel_connector *connector,63 u32 user_level, u32 user_max)64{65 struct intel_panel *panel = &connector->panel;66 u32 hw_level;67 68 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);69 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);70 71 return hw_level;72}73 74/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */75static u32 scale_hw_to_user(struct intel_connector *connector,76 u32 hw_level, u32 user_max)77{78 struct intel_panel *panel = &connector->panel;79 80 return scale(hw_level, panel->backlight.min, panel->backlight.max,81 0, user_max);82}83 84u32 intel_backlight_invert_pwm_level(struct intel_connector *connector, u32 val)85{86 struct intel_display *display = to_intel_display(connector);87 struct intel_panel *panel = &connector->panel;88 89 drm_WARN_ON(display->drm, panel->backlight.pwm_level_max == 0);90 91 if (display->params.invert_brightness < 0)92 return val;93 94 if (display->params.invert_brightness > 0 ||95 intel_has_quirk(display, QUIRK_INVERT_BRIGHTNESS)) {96 return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;97 }98 99 return val;100}101 102void intel_backlight_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)103{104 struct intel_connector *connector = to_intel_connector(conn_state->connector);105 struct drm_i915_private *i915 = to_i915(connector->base.dev);106 struct intel_panel *panel = &connector->panel;107 108 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight PWM = %d\n",109 connector->base.base.id, connector->base.name, val);110 panel->backlight.pwm_funcs->set(conn_state, val);111}112 113u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)114{115 struct drm_i915_private *i915 = to_i915(connector->base.dev);116 struct intel_panel *panel = &connector->panel;117 118 drm_WARN_ON_ONCE(&i915->drm,119 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);120 121 val = scale(val, panel->backlight.min, panel->backlight.max,122 panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);123 124 return intel_backlight_invert_pwm_level(connector, val);125}126 127u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)128{129 struct intel_display *display = to_intel_display(connector);130 struct intel_panel *panel = &connector->panel;131 132 drm_WARN_ON_ONCE(display->drm,133 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);134 135 if (display->params.invert_brightness > 0 ||136 (display->params.invert_brightness == 0 &&137 intel_has_quirk(display, QUIRK_INVERT_BRIGHTNESS)))138 val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);139 140 return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,141 panel->backlight.min, panel->backlight.max);142}143 144static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)145{146 struct drm_i915_private *i915 = to_i915(connector->base.dev);147 148 return intel_de_read(i915, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;149}150 151static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)152{153 struct drm_i915_private *i915 = to_i915(connector->base.dev);154 155 return intel_de_read(i915, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;156}157 158static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)159{160 struct drm_i915_private *i915 = to_i915(connector->base.dev);161 struct intel_panel *panel = &connector->panel;162 u32 val;163 164 val = intel_de_read(i915, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;165 if (DISPLAY_VER(i915) < 4)166 val >>= 1;167 168 if (panel->backlight.combination_mode) {169 u8 lbpc;170 171 pci_read_config_byte(to_pci_dev(i915->drm.dev), LBPC, &lbpc);172 val *= lbpc;173 }174 175 return val;176}177 178static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)179{180 struct drm_i915_private *i915 = to_i915(connector->base.dev);181 182 if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))183 return 0;184 185 return intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;186}187 188static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)189{190 struct drm_i915_private *i915 = to_i915(connector->base.dev);191 struct intel_panel *panel = &connector->panel;192 193 return intel_de_read(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller));194}195 196static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)197{198 struct intel_panel *panel = &connector->panel;199 struct pwm_state state;200 201 pwm_get_state(panel->backlight.pwm, &state);202 return pwm_get_relative_duty_cycle(&state, 100);203}204 205static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)206{207 struct intel_connector *connector = to_intel_connector(conn_state->connector);208 struct drm_i915_private *i915 = to_i915(connector->base.dev);209 u32 val;210 211 val = intel_de_read(i915, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;212 intel_de_write(i915, BLC_PWM_PCH_CTL2, val | level);213}214 215static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)216{217 struct intel_connector *connector = to_intel_connector(conn_state->connector);218 struct drm_i915_private *i915 = to_i915(connector->base.dev);219 u32 tmp;220 221 tmp = intel_de_read(i915, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;222 intel_de_write(i915, BLC_PWM_CPU_CTL, tmp | level);223}224 225static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)226{227 struct intel_connector *connector = to_intel_connector(conn_state->connector);228 struct drm_i915_private *i915 = to_i915(connector->base.dev);229 struct intel_panel *panel = &connector->panel;230 u32 tmp, mask;231 232 drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);233 234 if (panel->backlight.combination_mode) {235 u8 lbpc;236 237 lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;238 level /= lbpc;239 pci_write_config_byte(to_pci_dev(i915->drm.dev), LBPC, lbpc);240 }241 242 if (DISPLAY_VER(i915) == 4) {243 mask = BACKLIGHT_DUTY_CYCLE_MASK;244 } else {245 level <<= 1;246 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;247 }248 249 tmp = intel_de_read(i915, BLC_PWM_CTL) & ~mask;250 intel_de_write(i915, BLC_PWM_CTL, tmp | level);251}252 253static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)254{255 struct intel_connector *connector = to_intel_connector(conn_state->connector);256 struct drm_i915_private *i915 = to_i915(connector->base.dev);257 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;258 u32 tmp;259 260 tmp = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;261 intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), tmp | level);262}263 264static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)265{266 struct intel_connector *connector = to_intel_connector(conn_state->connector);267 struct drm_i915_private *i915 = to_i915(connector->base.dev);268 struct intel_panel *panel = &connector->panel;269 270 intel_de_write(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller), level);271}272 273static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)274{275 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;276 277 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);278 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);279}280 281static void282intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)283{284 struct intel_connector *connector = to_intel_connector(conn_state->connector);285 struct drm_i915_private *i915 = to_i915(connector->base.dev);286 struct intel_panel *panel = &connector->panel;287 288 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight level = %d\n",289 connector->base.base.id, connector->base.name, level);290 291 panel->backlight.funcs->set(conn_state, level);292}293 294/* set backlight brightness to level in range [0..max], assuming hw min is295 * respected.296 */297void intel_backlight_set_acpi(const struct drm_connector_state *conn_state,298 u32 user_level, u32 user_max)299{300 struct intel_connector *connector = to_intel_connector(conn_state->connector);301 struct drm_i915_private *i915 = to_i915(connector->base.dev);302 struct intel_panel *panel = &connector->panel;303 u32 hw_level;304 305 /*306 * Lack of crtc may occur during driver init because307 * connection_mutex isn't held across the entire backlight308 * setup + modeset readout, and the BIOS can issue the309 * requests at any time.310 */311 if (!panel->backlight.present || !conn_state->crtc)312 return;313 314 mutex_lock(&i915->display.backlight.lock);315 316 drm_WARN_ON(&i915->drm, panel->backlight.max == 0);317 318 hw_level = clamp_user_to_hw(connector, user_level, user_max);319 panel->backlight.level = hw_level;320 321 if (panel->backlight.device)322 panel->backlight.device->props.brightness =323 scale_hw_to_user(connector,324 panel->backlight.level,325 panel->backlight.device->props.max_brightness);326 327 if (panel->backlight.enabled)328 intel_panel_actually_set_backlight(conn_state, hw_level);329 330 mutex_unlock(&i915->display.backlight.lock);331}332 333static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)334{335 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);336 struct drm_i915_private *i915 = to_i915(connector->base.dev);337 u32 tmp;338 339 intel_backlight_set_pwm_level(old_conn_state, level);340 341 /*342 * Although we don't support or enable CPU PWM with LPT/SPT based343 * systems, it may have been enabled prior to loading the344 * driver. Disable to avoid warnings on LCPLL disable.345 *346 * This needs rework if we need to add support for CPU PWM on PCH split347 * platforms.348 */349 tmp = intel_de_read(i915, BLC_PWM_CPU_CTL2);350 if (tmp & BLM_PWM_ENABLE) {351 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight was enabled, disabling\n",352 connector->base.base.id, connector->base.name);353 intel_de_write(i915, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);354 }355 356 intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);357}358 359static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)360{361 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);362 struct drm_i915_private *i915 = to_i915(connector->base.dev);363 364 intel_backlight_set_pwm_level(old_conn_state, val);365 366 intel_de_rmw(i915, BLC_PWM_CPU_CTL2, BLM_PWM_ENABLE, 0);367 368 intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);369}370 371static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)372{373 intel_backlight_set_pwm_level(old_conn_state, val);374}375 376static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)377{378 struct drm_i915_private *i915 = to_i915(old_conn_state->connector->dev);379 380 intel_backlight_set_pwm_level(old_conn_state, val);381 382 intel_de_rmw(i915, BLC_PWM_CTL2, BLM_PWM_ENABLE, 0);383}384 385static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)386{387 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);388 struct drm_i915_private *i915 = to_i915(connector->base.dev);389 enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;390 391 intel_backlight_set_pwm_level(old_conn_state, val);392 393 intel_de_rmw(i915, VLV_BLC_PWM_CTL2(pipe), BLM_PWM_ENABLE, 0);394}395 396static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)397{398 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);399 struct drm_i915_private *i915 = to_i915(connector->base.dev);400 struct intel_panel *panel = &connector->panel;401 402 intel_backlight_set_pwm_level(old_conn_state, val);403 404 intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),405 BXT_BLC_PWM_ENABLE, 0);406 407 if (panel->backlight.controller == 1)408 intel_de_rmw(i915, UTIL_PIN_CTL, UTIL_PIN_ENABLE, 0);409}410 411static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)412{413 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);414 struct drm_i915_private *i915 = to_i915(connector->base.dev);415 struct intel_panel *panel = &connector->panel;416 417 intel_backlight_set_pwm_level(old_conn_state, val);418 419 intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),420 BXT_BLC_PWM_ENABLE, 0);421}422 423static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)424{425 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);426 struct intel_panel *panel = &connector->panel;427 428 intel_backlight_set_pwm_level(old_conn_state, level);429 430 panel->backlight.pwm_state.enabled = false;431 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);432}433 434void intel_backlight_disable(const struct drm_connector_state *old_conn_state)435{436 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);437 struct drm_i915_private *i915 = to_i915(connector->base.dev);438 struct intel_panel *panel = &connector->panel;439 440 if (!panel->backlight.present)441 return;442 443 /*444 * Do not disable backlight on the vga_switcheroo path. When switching445 * away from i915, the other client may depend on i915 to handle the446 * backlight. This will leave the backlight on unnecessarily when447 * another client is not activated.448 */449 if (i915->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {450 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Skipping backlight disable on vga switch\n",451 connector->base.base.id, connector->base.name);452 return;453 }454 455 mutex_lock(&i915->display.backlight.lock);456 457 if (panel->backlight.device)458 panel->backlight.device->props.power = BACKLIGHT_POWER_OFF;459 panel->backlight.enabled = false;460 panel->backlight.funcs->disable(old_conn_state, 0);461 462 mutex_unlock(&i915->display.backlight.lock);463}464 465static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,466 const struct drm_connector_state *conn_state, u32 level)467{468 struct intel_connector *connector = to_intel_connector(conn_state->connector);469 struct drm_i915_private *i915 = to_i915(connector->base.dev);470 struct intel_panel *panel = &connector->panel;471 u32 pch_ctl1, pch_ctl2;472 473 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);474 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {475 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",476 connector->base.base.id, connector->base.name);477 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;478 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);479 }480 481 if (HAS_PCH_LPT(i915))482 intel_de_rmw(i915, SOUTH_CHICKEN2, LPT_PWM_GRANULARITY,483 panel->backlight.alternate_pwm_increment ?484 LPT_PWM_GRANULARITY : 0);485 else486 intel_de_rmw(i915, SOUTH_CHICKEN1, SPT_PWM_GRANULARITY,487 panel->backlight.alternate_pwm_increment ?488 SPT_PWM_GRANULARITY : 0);489 490 pch_ctl2 = panel->backlight.pwm_level_max << 16;491 intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);492 493 pch_ctl1 = 0;494 if (panel->backlight.active_low_pwm)495 pch_ctl1 |= BLM_PCH_POLARITY;496 497 /* After LPT, override is the default. */498 if (HAS_PCH_LPT(i915))499 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;500 501 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);502 intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);503 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);504 505 /* This won't stick until the above enable. */506 intel_backlight_set_pwm_level(conn_state, level);507}508 509static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,510 const struct drm_connector_state *conn_state, u32 level)511{512 struct intel_connector *connector = to_intel_connector(conn_state->connector);513 struct drm_i915_private *i915 = to_i915(connector->base.dev);514 struct intel_panel *panel = &connector->panel;515 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;516 u32 cpu_ctl2, pch_ctl1, pch_ctl2;517 518 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);519 if (cpu_ctl2 & BLM_PWM_ENABLE) {520 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight already enabled\n",521 connector->base.base.id, connector->base.name);522 cpu_ctl2 &= ~BLM_PWM_ENABLE;523 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);524 }525 526 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);527 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {528 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",529 connector->base.base.id, connector->base.name);530 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;531 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);532 }533 534 if (cpu_transcoder == TRANSCODER_EDP)535 cpu_ctl2 = BLM_TRANSCODER_EDP;536 else537 cpu_ctl2 = BLM_PIPE(cpu_transcoder);538 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);539 intel_de_posting_read(i915, BLC_PWM_CPU_CTL2);540 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);541 542 /* This won't stick until the above enable. */543 intel_backlight_set_pwm_level(conn_state, level);544 545 pch_ctl2 = panel->backlight.pwm_level_max << 16;546 intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);547 548 pch_ctl1 = 0;549 if (panel->backlight.active_low_pwm)550 pch_ctl1 |= BLM_PCH_POLARITY;551 552 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);553 intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);554 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);555}556 557static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,558 const struct drm_connector_state *conn_state, u32 level)559{560 struct intel_connector *connector = to_intel_connector(conn_state->connector);561 struct drm_i915_private *i915 = to_i915(connector->base.dev);562 struct intel_panel *panel = &connector->panel;563 u32 ctl, freq;564 565 ctl = intel_de_read(i915, BLC_PWM_CTL);566 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {567 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",568 connector->base.base.id, connector->base.name);569 intel_de_write(i915, BLC_PWM_CTL, 0);570 }571 572 freq = panel->backlight.pwm_level_max;573 if (panel->backlight.combination_mode)574 freq /= 0xff;575 576 ctl = freq << 17;577 if (panel->backlight.combination_mode)578 ctl |= BLM_LEGACY_MODE;579 if (IS_PINEVIEW(i915) && panel->backlight.active_low_pwm)580 ctl |= BLM_POLARITY_PNV;581 582 intel_de_write(i915, BLC_PWM_CTL, ctl);583 intel_de_posting_read(i915, BLC_PWM_CTL);584 585 /* XXX: combine this into above write? */586 intel_backlight_set_pwm_level(conn_state, level);587 588 /*589 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is590 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2591 * that has backlight.592 */593 if (DISPLAY_VER(i915) == 2)594 intel_de_write(i915, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);595}596 597static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,598 const struct drm_connector_state *conn_state, u32 level)599{600 struct intel_connector *connector = to_intel_connector(conn_state->connector);601 struct drm_i915_private *i915 = to_i915(connector->base.dev);602 struct intel_panel *panel = &connector->panel;603 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;604 u32 ctl, ctl2, freq;605 606 ctl2 = intel_de_read(i915, BLC_PWM_CTL2);607 if (ctl2 & BLM_PWM_ENABLE) {608 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",609 connector->base.base.id, connector->base.name);610 ctl2 &= ~BLM_PWM_ENABLE;611 intel_de_write(i915, BLC_PWM_CTL2, ctl2);612 }613 614 freq = panel->backlight.pwm_level_max;615 if (panel->backlight.combination_mode)616 freq /= 0xff;617 618 ctl = freq << 16;619 intel_de_write(i915, BLC_PWM_CTL, ctl);620 621 ctl2 = BLM_PIPE(pipe);622 if (panel->backlight.combination_mode)623 ctl2 |= BLM_COMBINATION_MODE;624 if (panel->backlight.active_low_pwm)625 ctl2 |= BLM_POLARITY_I965;626 intel_de_write(i915, BLC_PWM_CTL2, ctl2);627 intel_de_posting_read(i915, BLC_PWM_CTL2);628 intel_de_write(i915, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);629 630 intel_backlight_set_pwm_level(conn_state, level);631}632 633static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,634 const struct drm_connector_state *conn_state, u32 level)635{636 struct intel_connector *connector = to_intel_connector(conn_state->connector);637 struct drm_i915_private *i915 = to_i915(connector->base.dev);638 struct intel_panel *panel = &connector->panel;639 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;640 u32 ctl, ctl2;641 642 ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));643 if (ctl2 & BLM_PWM_ENABLE) {644 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",645 connector->base.base.id, connector->base.name);646 ctl2 &= ~BLM_PWM_ENABLE;647 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);648 }649 650 ctl = panel->backlight.pwm_level_max << 16;651 intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), ctl);652 653 /* XXX: combine this into above write? */654 intel_backlight_set_pwm_level(conn_state, level);655 656 ctl2 = 0;657 if (panel->backlight.active_low_pwm)658 ctl2 |= BLM_POLARITY_I965;659 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);660 intel_de_posting_read(i915, VLV_BLC_PWM_CTL2(pipe));661 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);662}663 664static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,665 const struct drm_connector_state *conn_state, u32 level)666{667 struct intel_connector *connector = to_intel_connector(conn_state->connector);668 struct drm_i915_private *i915 = to_i915(connector->base.dev);669 struct intel_panel *panel = &connector->panel;670 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;671 u32 pwm_ctl, val;672 673 /* Controller 1 uses the utility pin. */674 if (panel->backlight.controller == 1) {675 val = intel_de_read(i915, UTIL_PIN_CTL);676 if (val & UTIL_PIN_ENABLE) {677 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] utility pin already enabled\n",678 connector->base.base.id, connector->base.name);679 val &= ~UTIL_PIN_ENABLE;680 intel_de_write(i915, UTIL_PIN_CTL, val);681 }682 683 val = 0;684 if (panel->backlight.util_pin_active_low)685 val |= UTIL_PIN_POLARITY;686 intel_de_write(i915, UTIL_PIN_CTL,687 val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);688 }689 690 pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));691 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {692 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",693 connector->base.base.id, connector->base.name);694 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;695 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),696 pwm_ctl);697 }698 699 intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),700 panel->backlight.pwm_level_max);701 702 intel_backlight_set_pwm_level(conn_state, level);703 704 pwm_ctl = 0;705 if (panel->backlight.active_low_pwm)706 pwm_ctl |= BXT_BLC_PWM_POLARITY;707 708 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);709 intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));710 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),711 pwm_ctl | BXT_BLC_PWM_ENABLE);712}713 714static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,715 const struct drm_connector_state *conn_state, u32 level)716{717 struct intel_connector *connector = to_intel_connector(conn_state->connector);718 struct drm_i915_private *i915 = to_i915(connector->base.dev);719 struct intel_panel *panel = &connector->panel;720 u32 pwm_ctl;721 722 pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));723 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {724 drm_dbg_kms(&i915->drm, "backlight already enabled\n");725 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;726 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),727 pwm_ctl);728 }729 730 intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),731 panel->backlight.pwm_level_max);732 733 intel_backlight_set_pwm_level(conn_state, level);734 735 pwm_ctl = 0;736 if (panel->backlight.active_low_pwm)737 pwm_ctl |= BXT_BLC_PWM_POLARITY;738 739 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);740 intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));741 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),742 pwm_ctl | BXT_BLC_PWM_ENABLE);743}744 745static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,746 const struct drm_connector_state *conn_state, u32 level)747{748 struct intel_connector *connector = to_intel_connector(conn_state->connector);749 struct intel_panel *panel = &connector->panel;750 751 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);752 panel->backlight.pwm_state.enabled = true;753 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);754}755 756static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state,757 const struct drm_connector_state *conn_state)758{759 struct intel_connector *connector = to_intel_connector(conn_state->connector);760 struct intel_panel *panel = &connector->panel;761 762 WARN_ON(panel->backlight.max == 0);763 764 if (panel->backlight.level < panel->backlight.min) {765 panel->backlight.level = panel->backlight.min;766 if (panel->backlight.device)767 panel->backlight.device->props.brightness =768 scale_hw_to_user(connector,769 panel->backlight.level,770 panel->backlight.device->props.max_brightness);771 }772 773 panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);774 panel->backlight.enabled = true;775 if (panel->backlight.device)776 panel->backlight.device->props.power = BACKLIGHT_POWER_ON;777}778 779void intel_backlight_enable(const struct intel_crtc_state *crtc_state,780 const struct drm_connector_state *conn_state)781{782 struct intel_connector *connector = to_intel_connector(conn_state->connector);783 struct drm_i915_private *i915 = to_i915(connector->base.dev);784 struct intel_panel *panel = &connector->panel;785 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;786 787 if (!panel->backlight.present)788 return;789 790 drm_dbg_kms(&i915->drm, "pipe %c\n", pipe_name(pipe));791 792 mutex_lock(&i915->display.backlight.lock);793 794 __intel_backlight_enable(crtc_state, conn_state);795 796 mutex_unlock(&i915->display.backlight.lock);797}798 799#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)800static u32 intel_panel_get_backlight(struct intel_connector *connector)801{802 struct drm_i915_private *i915 = to_i915(connector->base.dev);803 struct intel_panel *panel = &connector->panel;804 u32 val = 0;805 806 mutex_lock(&i915->display.backlight.lock);807 808 if (panel->backlight.enabled)809 val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));810 811 mutex_unlock(&i915->display.backlight.lock);812 813 drm_dbg_kms(&i915->drm, "get backlight PWM = %d\n", val);814 return val;815}816 817/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */818static u32 scale_user_to_hw(struct intel_connector *connector,819 u32 user_level, u32 user_max)820{821 struct intel_panel *panel = &connector->panel;822 823 return scale(user_level, 0, user_max,824 panel->backlight.min, panel->backlight.max);825}826 827/* set backlight brightness to level in range [0..max], scaling wrt hw min */828static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,829 u32 user_level, u32 user_max)830{831 struct intel_connector *connector = to_intel_connector(conn_state->connector);832 struct drm_i915_private *i915 = to_i915(connector->base.dev);833 struct intel_panel *panel = &connector->panel;834 u32 hw_level;835 836 if (!panel->backlight.present)837 return;838 839 mutex_lock(&i915->display.backlight.lock);840 841 drm_WARN_ON(&i915->drm, panel->backlight.max == 0);842 843 hw_level = scale_user_to_hw(connector, user_level, user_max);844 panel->backlight.level = hw_level;845 846 if (panel->backlight.enabled)847 intel_panel_actually_set_backlight(conn_state, hw_level);848 849 mutex_unlock(&i915->display.backlight.lock);850}851 852static int intel_backlight_device_update_status(struct backlight_device *bd)853{854 struct intel_connector *connector = bl_get_data(bd);855 struct drm_i915_private *i915 = to_i915(connector->base.dev);856 struct intel_panel *panel = &connector->panel;857 858 drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);859 860 drm_dbg_kms(&i915->drm, "updating intel_backlight, brightness=%d/%d\n",861 bd->props.brightness, bd->props.max_brightness);862 intel_panel_set_backlight(connector->base.state, bd->props.brightness,863 bd->props.max_brightness);864 865 /*866 * Allow flipping bl_power as a sub-state of enabled. Sadly the867 * backlight class device does not make it easy to differentiate868 * between callbacks for brightness and bl_power, so our backlight_power869 * callback needs to take this into account.870 */871 if (panel->backlight.enabled) {872 if (panel->backlight.power) {873 bool enable = bd->props.power == BACKLIGHT_POWER_ON &&874 bd->props.brightness != 0;875 panel->backlight.power(connector, enable);876 }877 } else {878 bd->props.power = BACKLIGHT_POWER_OFF;879 }880 881 drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);882 883 return 0;884}885 886static int intel_backlight_device_get_brightness(struct backlight_device *bd)887{888 struct intel_connector *connector = bl_get_data(bd);889 struct drm_i915_private *i915 = to_i915(connector->base.dev);890 intel_wakeref_t wakeref;891 int ret = 0;892 893 with_intel_runtime_pm(&i915->runtime_pm, wakeref) {894 u32 hw_level;895 896 drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);897 898 hw_level = intel_panel_get_backlight(connector);899 ret = scale_hw_to_user(connector,900 hw_level, bd->props.max_brightness);901 902 drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);903 }904 905 return ret;906}907 908static const struct backlight_ops intel_backlight_device_ops = {909 .update_status = intel_backlight_device_update_status,910 .get_brightness = intel_backlight_device_get_brightness,911};912 913int intel_backlight_device_register(struct intel_connector *connector)914{915 struct drm_i915_private *i915 = to_i915(connector->base.dev);916 struct intel_panel *panel = &connector->panel;917 struct backlight_properties props;918 struct backlight_device *bd;919 const char *name;920 int ret = 0;921 922 if (WARN_ON(panel->backlight.device))923 return -ENODEV;924 925 if (!panel->backlight.present)926 return 0;927 928 WARN_ON(panel->backlight.max == 0);929 930 if (!acpi_video_backlight_use_native()) {931 drm_info(&i915->drm, "Skipping intel_backlight registration\n");932 return 0;933 }934 935 memset(&props, 0, sizeof(props));936 props.type = BACKLIGHT_RAW;937 938 /*939 * Note: Everything should work even if the backlight device max940 * presented to the userspace is arbitrarily chosen.941 */942 props.max_brightness = panel->backlight.max;943 props.brightness = scale_hw_to_user(connector,944 panel->backlight.level,945 props.max_brightness);946 947 if (panel->backlight.enabled)948 props.power = BACKLIGHT_POWER_ON;949 else950 props.power = BACKLIGHT_POWER_OFF;951 952 name = kstrdup_const("intel_backlight", GFP_KERNEL);953 if (!name)954 return -ENOMEM;955 956 bd = backlight_device_get_by_name(name);957 if (bd) {958 put_device(&bd->dev);959 /*960 * Using the same name independent of the drm device or connector961 * prevents registration of multiple backlight devices in the962 * driver. However, we need to use the default name for backward963 * compatibility. Use unique names for subsequent backlight devices as a964 * fallback when the default name already exists.965 */966 kfree_const(name);967 name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",968 i915->drm.primary->index, connector->base.name);969 if (!name)970 return -ENOMEM;971 }972 bd = backlight_device_register(name, connector->base.kdev, connector,973 &intel_backlight_device_ops, &props);974 975 if (IS_ERR(bd)) {976 drm_err(&i915->drm,977 "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",978 connector->base.base.id, connector->base.name, name, PTR_ERR(bd));979 ret = PTR_ERR(bd);980 goto out;981 }982 983 panel->backlight.device = bd;984 985 drm_dbg_kms(&i915->drm,986 "[CONNECTOR:%d:%s] backlight device %s registered\n",987 connector->base.base.id, connector->base.name, name);988 989out:990 kfree_const(name);991 992 return ret;993}994 995void intel_backlight_device_unregister(struct intel_connector *connector)996{997 struct intel_panel *panel = &connector->panel;998 999 if (panel->backlight.device) {1000 backlight_device_unregister(panel->backlight.device);1001 panel->backlight.device = NULL;1002 }1003}1004#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */1005 1006/*1007 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.1008 * PWM increment = 11009 */1010static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1011{1012 struct drm_i915_private *i915 = to_i915(connector->base.dev);1013 1014 return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),1015 pwm_freq_hz);1016}1017 1018/*1019 * BXT: PWM clock frequency = 19.2 MHz.1020 */1021static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1022{1023 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);1024}1025 1026/*1027 * SPT: This value represents the period of the PWM stream in clock periods1028 * multiplied by 16 (default increment) or 128 (alternate increment selected in1029 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.1030 */1031static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1032{1033 struct intel_panel *panel = &connector->panel;1034 u32 mul;1035 1036 if (panel->backlight.alternate_pwm_increment)1037 mul = 128;1038 else1039 mul = 16;1040 1041 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);1042}1043 1044/*1045 * LPT: This value represents the period of the PWM stream in clock periods1046 * multiplied by 128 (default increment) or 16 (alternate increment, selected in1047 * LPT SOUTH_CHICKEN2 register bit 5).1048 */1049static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1050{1051 struct drm_i915_private *i915 = to_i915(connector->base.dev);1052 struct intel_panel *panel = &connector->panel;1053 u32 mul, clock;1054 1055 if (panel->backlight.alternate_pwm_increment)1056 mul = 16;1057 else1058 mul = 128;1059 1060 if (HAS_PCH_LPT_H(i915))1061 clock = MHz(135); /* LPT:H */1062 else1063 clock = MHz(24); /* LPT:LP */1064 1065 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);1066}1067 1068/*1069 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH1070 * display raw clocks multiplied by 128.1071 */1072static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1073{1074 struct drm_i915_private *i915 = to_i915(connector->base.dev);1075 1076 return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),1077 pwm_freq_hz * 128);1078}1079 1080/*1081 * Gen2: This field determines the number of time base events (display core1082 * clock frequency/32) in total for a complete cycle of modulated backlight1083 * control.1084 *1085 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)1086 * divided by 32.1087 */1088static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1089{1090 struct drm_i915_private *i915 = to_i915(connector->base.dev);1091 int clock;1092 1093 if (IS_PINEVIEW(i915))1094 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);1095 else1096 clock = KHz(i915->display.cdclk.hw.cdclk);1097 1098 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);1099}1100 1101/*1102 * Gen4: This value represents the period of the PWM stream in display core1103 * clocks ([DevCTG] HRAW clocks) multiplied by 128.1104 *1105 */1106static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1107{1108 struct drm_i915_private *i915 = to_i915(connector->base.dev);1109 int clock;1110 1111 if (IS_G4X(i915))1112 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);1113 else1114 clock = KHz(i915->display.cdclk.hw.cdclk);1115 1116 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);1117}1118 1119/*1120 * VLV: This value represents the period of the PWM stream in display core1121 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks1122 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.1123 */1124static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)1125{1126 struct drm_i915_private *i915 = to_i915(connector->base.dev);1127 int mul, clock;1128 1129 if ((intel_de_read(i915, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {1130 if (IS_CHERRYVIEW(i915))1131 clock = KHz(19200);1132 else1133 clock = MHz(25);1134 mul = 16;1135 } else {1136 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);1137 mul = 128;1138 }1139 1140 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);1141}1142 1143static u16 get_vbt_pwm_freq(struct intel_connector *connector)1144{1145 struct drm_i915_private *i915 = to_i915(connector->base.dev);1146 u16 pwm_freq_hz = connector->panel.vbt.backlight.pwm_freq_hz;1147 1148 if (pwm_freq_hz) {1149 drm_dbg_kms(&i915->drm,1150 "VBT defined backlight frequency %u Hz\n",1151 pwm_freq_hz);1152 } else {1153 pwm_freq_hz = 200;1154 drm_dbg_kms(&i915->drm,1155 "default backlight frequency %u Hz\n",1156 pwm_freq_hz);1157 }1158 1159 return pwm_freq_hz;1160}1161 1162static u32 get_backlight_max_vbt(struct intel_connector *connector)1163{1164 struct drm_i915_private *i915 = to_i915(connector->base.dev);1165 struct intel_panel *panel = &connector->panel;1166 u16 pwm_freq_hz = get_vbt_pwm_freq(connector);1167 u32 pwm;1168 1169 if (!panel->backlight.pwm_funcs->hz_to_pwm) {1170 drm_dbg_kms(&i915->drm,1171 "backlight frequency conversion not supported\n");1172 return 0;1173 }1174 1175 pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);1176 if (!pwm) {1177 drm_dbg_kms(&i915->drm,1178 "backlight frequency conversion failed\n");1179 return 0;1180 }1181 1182 return pwm;1183}1184 1185/*1186 * Note: The setup hooks can't assume pipe is set!1187 */1188static u32 get_backlight_min_vbt(struct intel_connector *connector)1189{1190 struct drm_i915_private *i915 = to_i915(connector->base.dev);1191 struct intel_panel *panel = &connector->panel;1192 int min;1193 1194 drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);1195 1196 /*1197 * XXX: If the vbt value is 255, it makes min equal to max, which leads1198 * to problems. There are such machines out there. Either our1199 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard1200 * against this by letting the minimum be at most (arbitrarily chosen)1201 * 25% of the max.1202 */1203 min = clamp_t(int, connector->panel.vbt.backlight.min_brightness, 0, 64);1204 if (min != connector->panel.vbt.backlight.min_brightness) {1205 drm_dbg_kms(&i915->drm,1206 "clamping VBT min backlight %d/255 to %d/255\n",1207 connector->panel.vbt.backlight.min_brightness, min);1208 }1209 1210 /* vbt value is a coefficient in range [0..255] */1211 return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);1212}1213 1214static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)1215{1216 struct drm_i915_private *i915 = to_i915(connector->base.dev);1217 struct intel_panel *panel = &connector->panel;1218 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;1219 bool alt, cpu_mode;1220 1221 if (HAS_PCH_LPT(i915))1222 alt = intel_de_read(i915, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;1223 else1224 alt = intel_de_read(i915, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;1225 panel->backlight.alternate_pwm_increment = alt;1226 1227 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);1228 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;1229 1230 pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);1231 panel->backlight.pwm_level_max = pch_ctl2 >> 16;1232 1233 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);1234 1235 if (!panel->backlight.pwm_level_max)1236 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);1237 1238 if (!panel->backlight.pwm_level_max)1239 return -ENODEV;1240 1241 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1242 1243 panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;1244 1245 cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(i915) &&1246 !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&1247 (cpu_ctl2 & BLM_PWM_ENABLE);1248 1249 if (cpu_mode) {1250 val = pch_get_backlight(connector, unused);1251 1252 drm_dbg_kms(&i915->drm,1253 "CPU backlight register was enabled, switching to PCH override\n");1254 1255 /* Write converted CPU PWM value to PCH override register */1256 lpt_set_backlight(connector->base.state, val);1257 intel_de_write(i915, BLC_PWM_PCH_CTL1,1258 pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);1259 1260 intel_de_write(i915, BLC_PWM_CPU_CTL2,1261 cpu_ctl2 & ~BLM_PWM_ENABLE);1262 }1263 1264 drm_dbg_kms(&i915->drm,1265 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",1266 connector->base.base.id, connector->base.name);1267 1268 return 0;1269}1270 1271static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)1272{1273 struct drm_i915_private *i915 = to_i915(connector->base.dev);1274 struct intel_panel *panel = &connector->panel;1275 u32 cpu_ctl2, pch_ctl1, pch_ctl2;1276 1277 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);1278 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;1279 1280 pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);1281 panel->backlight.pwm_level_max = pch_ctl2 >> 16;1282 1283 if (!panel->backlight.pwm_level_max)1284 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);1285 1286 if (!panel->backlight.pwm_level_max)1287 return -ENODEV;1288 1289 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1290 1291 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);1292 panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&1293 (pch_ctl1 & BLM_PCH_PWM_ENABLE);1294 1295 drm_dbg_kms(&i915->drm,1296 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",1297 connector->base.base.id, connector->base.name);1298 1299 return 0;1300}1301 1302static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)1303{1304 struct drm_i915_private *i915 = to_i915(connector->base.dev);1305 struct intel_panel *panel = &connector->panel;1306 u32 ctl, val;1307 1308 ctl = intel_de_read(i915, BLC_PWM_CTL);1309 1310 if (DISPLAY_VER(i915) == 2 || IS_I915GM(i915) || IS_I945GM(i915))1311 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;1312 1313 if (IS_PINEVIEW(i915))1314 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;1315 1316 panel->backlight.pwm_level_max = ctl >> 17;1317 1318 if (!panel->backlight.pwm_level_max) {1319 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);1320 panel->backlight.pwm_level_max >>= 1;1321 }1322 1323 if (!panel->backlight.pwm_level_max)1324 return -ENODEV;1325 1326 if (panel->backlight.combination_mode)1327 panel->backlight.pwm_level_max *= 0xff;1328 1329 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1330 1331 val = i9xx_get_backlight(connector, unused);1332 val = intel_backlight_invert_pwm_level(connector, val);1333 val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);1334 1335 panel->backlight.pwm_enabled = val != 0;1336 1337 drm_dbg_kms(&i915->drm,1338 "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",1339 connector->base.base.id, connector->base.name);1340 1341 return 0;1342}1343 1344static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)1345{1346 struct drm_i915_private *i915 = to_i915(connector->base.dev);1347 struct intel_panel *panel = &connector->panel;1348 u32 ctl, ctl2;1349 1350 ctl2 = intel_de_read(i915, BLC_PWM_CTL2);1351 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;1352 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;1353 1354 ctl = intel_de_read(i915, BLC_PWM_CTL);1355 panel->backlight.pwm_level_max = ctl >> 16;1356 1357 if (!panel->backlight.pwm_level_max)1358 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);1359 1360 if (!panel->backlight.pwm_level_max)1361 return -ENODEV;1362 1363 if (panel->backlight.combination_mode)1364 panel->backlight.pwm_level_max *= 0xff;1365 1366 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1367 1368 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;1369 1370 drm_dbg_kms(&i915->drm,1371 "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",1372 connector->base.base.id, connector->base.name);1373 1374 return 0;1375}1376 1377static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)1378{1379 struct drm_i915_private *i915 = to_i915(connector->base.dev);1380 struct intel_panel *panel = &connector->panel;1381 u32 ctl, ctl2;1382 1383 if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))1384 return -ENODEV;1385 1386 ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));1387 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;1388 1389 ctl = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe));1390 panel->backlight.pwm_level_max = ctl >> 16;1391 1392 if (!panel->backlight.pwm_level_max)1393 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);1394 1395 if (!panel->backlight.pwm_level_max)1396 return -ENODEV;1397 1398 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1399 1400 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;1401 1402 drm_dbg_kms(&i915->drm,1403 "[CONNECTOR:%d:%s] Using native PWM for backlight control (on pipe %c)\n",1404 connector->base.base.id, connector->base.name, pipe_name(pipe));1405 1406 return 0;1407}1408 1409static int1410bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)1411{1412 struct drm_i915_private *i915 = to_i915(connector->base.dev);1413 struct intel_panel *panel = &connector->panel;1414 u32 pwm_ctl, val;1415 1416 panel->backlight.controller = connector->panel.vbt.backlight.controller;1417 1418 pwm_ctl = intel_de_read(i915,1419 BXT_BLC_PWM_CTL(panel->backlight.controller));1420 1421 /* Controller 1 uses the utility pin. */1422 if (panel->backlight.controller == 1) {1423 val = intel_de_read(i915, UTIL_PIN_CTL);1424 panel->backlight.util_pin_active_low =1425 val & UTIL_PIN_POLARITY;1426 }1427 1428 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;1429 panel->backlight.pwm_level_max =1430 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));1431 1432 if (!panel->backlight.pwm_level_max)1433 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);1434 1435 if (!panel->backlight.pwm_level_max)1436 return -ENODEV;1437 1438 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1439 1440 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;1441 1442 drm_dbg_kms(&i915->drm,1443 "[CONNECTOR:%d:%s] Using native PWM for backlight control (controller=%d)\n",1444 connector->base.base.id, connector->base.name,1445 panel->backlight.controller);1446 1447 return 0;1448}1449 1450static int cnp_num_backlight_controllers(struct drm_i915_private *i915)1451{1452 if (INTEL_PCH_TYPE(i915) >= PCH_MTL)1453 return 2;1454 1455 if (INTEL_PCH_TYPE(i915) >= PCH_DG1)1456 return 1;1457 1458 if (INTEL_PCH_TYPE(i915) >= PCH_ICP)1459 return 2;1460 1461 return 1;1462}1463 1464static bool cnp_backlight_controller_is_valid(struct drm_i915_private *i915, int controller)1465{1466 if (controller < 0 || controller >= cnp_num_backlight_controllers(i915))1467 return false;1468 1469 if (controller == 1 &&1470 INTEL_PCH_TYPE(i915) >= PCH_ICP &&1471 INTEL_PCH_TYPE(i915) <= PCH_ADP)1472 return intel_de_read(i915, SOUTH_CHICKEN1) & ICP_SECOND_PPS_IO_SELECT;1473 1474 return true;1475}1476 1477static int1478cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)1479{1480 struct drm_i915_private *i915 = to_i915(connector->base.dev);1481 struct intel_panel *panel = &connector->panel;1482 u32 pwm_ctl;1483 1484 /*1485 * CNP has the BXT implementation of backlight, but with only one1486 * controller. ICP+ can have two controllers, depending on pin muxing.1487 */1488 panel->backlight.controller = connector->panel.vbt.backlight.controller;1489 if (!cnp_backlight_controller_is_valid(i915, panel->backlight.controller)) {1490 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Invalid backlight controller %d, assuming 0\n",1491 connector->base.base.id, connector->base.name,1492 panel->backlight.controller);1493 panel->backlight.controller = 0;1494 }1495 1496 pwm_ctl = intel_de_read(i915,1497 BXT_BLC_PWM_CTL(panel->backlight.controller));1498 1499 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;1500 panel->backlight.pwm_level_max =1501 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));1502 1503 if (!panel->backlight.pwm_level_max)1504 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);1505 1506 if (!panel->backlight.pwm_level_max)1507 return -ENODEV;1508 1509 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1510 1511 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;1512 1513 drm_dbg_kms(&i915->drm,1514 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control (controller=%d)\n",1515 connector->base.base.id, connector->base.name,1516 panel->backlight.controller);1517 1518 return 0;1519}1520 1521static int ext_pwm_setup_backlight(struct intel_connector *connector,1522 enum pipe pipe)1523{1524 struct drm_i915_private *i915 = to_i915(connector->base.dev);1525 struct intel_panel *panel = &connector->panel;1526 const char *desc;1527 u32 level;1528 1529 /* Get the right PWM chip for DSI backlight according to VBT */1530 if (connector->panel.vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {1531 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_pmic_backlight");1532 desc = "PMIC";1533 } else {1534 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_soc_backlight");1535 desc = "SoC";1536 }1537 1538 if (IS_ERR(panel->backlight.pwm)) {1539 drm_err(&i915->drm, "[CONNECTOR:%d:%s] Failed to get the %s PWM chip\n",1540 connector->base.base.id, connector->base.name, desc);1541 panel->backlight.pwm = NULL;1542 return -ENODEV;1543 }1544 1545 panel->backlight.pwm_level_max = 100; /* 100% */1546 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);1547 1548 if (pwm_is_enabled(panel->backlight.pwm)) {1549 /* PWM is already enabled, use existing settings */1550 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);1551 1552 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,1553 100);1554 level = intel_backlight_invert_pwm_level(connector, level);1555 panel->backlight.pwm_enabled = true;1556 1557 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PWM already enabled at freq %ld, VBT freq %d, level %d\n",1558 connector->base.base.id, connector->base.name,1559 NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,1560 get_vbt_pwm_freq(connector), level);1561 } else {1562 /* Set period from VBT frequency, leave other settings at 0. */1563 panel->backlight.pwm_state.period =1564 NSEC_PER_SEC / get_vbt_pwm_freq(connector);1565 }1566 1567 drm_dbg_kms(&i915->drm,1568 "[CONNECTOR:%d:%s] Using %s PWM for backlight control\n",1569 connector->base.base.id, connector->base.name, desc);1570 1571 return 0;1572}1573 1574static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)1575{1576 struct intel_connector *connector = to_intel_connector(conn_state->connector);1577 struct intel_panel *panel = &connector->panel;1578 1579 panel->backlight.pwm_funcs->set(conn_state,1580 intel_backlight_invert_pwm_level(connector, level));1581}1582 1583static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)1584{1585 struct intel_panel *panel = &connector->panel;1586 1587 return intel_backlight_invert_pwm_level(connector,1588 panel->backlight.pwm_funcs->get(connector, pipe));1589}1590 1591static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,1592 const struct drm_connector_state *conn_state, u32 level)1593{1594 struct intel_connector *connector = to_intel_connector(conn_state->connector);1595 struct intel_panel *panel = &connector->panel;1596 1597 panel->backlight.pwm_funcs->enable(crtc_state, conn_state,1598 intel_backlight_invert_pwm_level(connector, level));1599}1600 1601static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)1602{1603 struct intel_connector *connector = to_intel_connector(conn_state->connector);1604 struct intel_panel *panel = &connector->panel;1605 1606 panel->backlight.pwm_funcs->disable(conn_state,1607 intel_backlight_invert_pwm_level(connector, level));1608}1609 1610static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)1611{1612 struct intel_panel *panel = &connector->panel;1613 int ret;1614 1615 ret = panel->backlight.pwm_funcs->setup(connector, pipe);1616 if (ret < 0)1617 return ret;1618 1619 panel->backlight.min = panel->backlight.pwm_level_min;1620 panel->backlight.max = panel->backlight.pwm_level_max;1621 panel->backlight.level = intel_pwm_get_backlight(connector, pipe);1622 panel->backlight.enabled = panel->backlight.pwm_enabled;1623 1624 return 0;1625}1626 1627void intel_backlight_update(struct intel_atomic_state *state,1628 struct intel_encoder *encoder,1629 const struct intel_crtc_state *crtc_state,1630 const struct drm_connector_state *conn_state)1631{1632 struct intel_connector *connector = to_intel_connector(conn_state->connector);1633 struct drm_i915_private *i915 = to_i915(connector->base.dev);1634 struct intel_panel *panel = &connector->panel;1635 1636 if (!panel->backlight.present)1637 return;1638 1639 mutex_lock(&i915->display.backlight.lock);1640 if (!panel->backlight.enabled)1641 __intel_backlight_enable(crtc_state, conn_state);1642 1643 mutex_unlock(&i915->display.backlight.lock);1644}1645 1646int intel_backlight_setup(struct intel_connector *connector, enum pipe pipe)1647{1648 struct intel_display *display = to_intel_display(connector);1649 struct intel_panel *panel = &connector->panel;1650 int ret;1651 1652 if (!connector->panel.vbt.backlight.present) {1653 if (intel_has_quirk(display, QUIRK_BACKLIGHT_PRESENT)) {1654 drm_dbg_kms(display->drm,1655 "[CONNECTOR:%d:%s] no backlight present per VBT, but present per quirk\n",1656 connector->base.base.id, connector->base.name);1657 } else {1658 drm_dbg_kms(display->drm,1659 "[CONNECTOR:%d:%s] no backlight present per VBT\n",1660 connector->base.base.id, connector->base.name);1661 return 0;1662 }1663 }1664 1665 /* ensure intel_panel has been initialized first */1666 if (drm_WARN_ON(display->drm, !panel->backlight.funcs))1667 return -ENODEV;1668 1669 /* set level and max in panel struct */1670 mutex_lock(&display->backlight.lock);1671 ret = panel->backlight.funcs->setup(connector, pipe);1672 mutex_unlock(&display->backlight.lock);1673 1674 if (ret) {1675 drm_dbg_kms(display->drm,1676 "[CONNECTOR:%d:%s] failed to setup backlight\n",1677 connector->base.base.id, connector->base.name);1678 return ret;1679 }1680 1681 panel->backlight.present = true;1682 1683 drm_dbg_kms(display->drm,1684 "[CONNECTOR:%d:%s] backlight initialized, %s, brightness %u/%u\n",1685 connector->base.base.id, connector->base.name,1686 str_enabled_disabled(panel->backlight.enabled),1687 panel->backlight.level, panel->backlight.max);1688 1689 return 0;1690}1691 1692void intel_backlight_destroy(struct intel_panel *panel)1693{1694 /* dispose of the pwm */1695 if (panel->backlight.pwm)1696 pwm_put(panel->backlight.pwm);1697 1698 panel->backlight.present = false;1699}1700 1701static const struct intel_panel_bl_funcs bxt_pwm_funcs = {1702 .setup = bxt_setup_backlight,1703 .enable = bxt_enable_backlight,1704 .disable = bxt_disable_backlight,1705 .set = bxt_set_backlight,1706 .get = bxt_get_backlight,1707 .hz_to_pwm = bxt_hz_to_pwm,1708};1709 1710static const struct intel_panel_bl_funcs cnp_pwm_funcs = {1711 .setup = cnp_setup_backlight,1712 .enable = cnp_enable_backlight,1713 .disable = cnp_disable_backlight,1714 .set = bxt_set_backlight,1715 .get = bxt_get_backlight,1716 .hz_to_pwm = cnp_hz_to_pwm,1717};1718 1719static const struct intel_panel_bl_funcs lpt_pwm_funcs = {1720 .setup = lpt_setup_backlight,1721 .enable = lpt_enable_backlight,1722 .disable = lpt_disable_backlight,1723 .set = lpt_set_backlight,1724 .get = lpt_get_backlight,1725 .hz_to_pwm = lpt_hz_to_pwm,1726};1727 1728static const struct intel_panel_bl_funcs spt_pwm_funcs = {1729 .setup = lpt_setup_backlight,1730 .enable = lpt_enable_backlight,1731 .disable = lpt_disable_backlight,1732 .set = lpt_set_backlight,1733 .get = lpt_get_backlight,1734 .hz_to_pwm = spt_hz_to_pwm,1735};1736 1737static const struct intel_panel_bl_funcs pch_pwm_funcs = {1738 .setup = pch_setup_backlight,1739 .enable = pch_enable_backlight,1740 .disable = pch_disable_backlight,1741 .set = pch_set_backlight,1742 .get = pch_get_backlight,1743 .hz_to_pwm = pch_hz_to_pwm,1744};1745 1746static const struct intel_panel_bl_funcs ext_pwm_funcs = {1747 .setup = ext_pwm_setup_backlight,1748 .enable = ext_pwm_enable_backlight,1749 .disable = ext_pwm_disable_backlight,1750 .set = ext_pwm_set_backlight,1751 .get = ext_pwm_get_backlight,1752};1753 1754static const struct intel_panel_bl_funcs vlv_pwm_funcs = {1755 .setup = vlv_setup_backlight,1756 .enable = vlv_enable_backlight,1757 .disable = vlv_disable_backlight,1758 .set = vlv_set_backlight,1759 .get = vlv_get_backlight,1760 .hz_to_pwm = vlv_hz_to_pwm,1761};1762 1763static const struct intel_panel_bl_funcs i965_pwm_funcs = {1764 .setup = i965_setup_backlight,1765 .enable = i965_enable_backlight,1766 .disable = i965_disable_backlight,1767 .set = i9xx_set_backlight,1768 .get = i9xx_get_backlight,1769 .hz_to_pwm = i965_hz_to_pwm,1770};1771 1772static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {1773 .setup = i9xx_setup_backlight,1774 .enable = i9xx_enable_backlight,1775 .disable = i9xx_disable_backlight,1776 .set = i9xx_set_backlight,1777 .get = i9xx_get_backlight,1778 .hz_to_pwm = i9xx_hz_to_pwm,1779};1780 1781static const struct intel_panel_bl_funcs pwm_bl_funcs = {1782 .setup = intel_pwm_setup_backlight,1783 .enable = intel_pwm_enable_backlight,1784 .disable = intel_pwm_disable_backlight,1785 .set = intel_pwm_set_backlight,1786 .get = intel_pwm_get_backlight,1787};1788 1789/* Set up chip specific backlight functions */1790void intel_backlight_init_funcs(struct intel_panel *panel)1791{1792 struct intel_connector *connector =1793 container_of(panel, struct intel_connector, panel);1794 struct drm_i915_private *i915 = to_i915(connector->base.dev);1795 1796 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&1797 intel_dsi_dcs_init_backlight_funcs(connector) == 0)1798 return;1799 1800 if (IS_GEMINILAKE(i915) || IS_BROXTON(i915)) {1801 panel->backlight.pwm_funcs = &bxt_pwm_funcs;1802 } else if (INTEL_PCH_TYPE(i915) >= PCH_CNP) {1803 panel->backlight.pwm_funcs = &cnp_pwm_funcs;1804 } else if (INTEL_PCH_TYPE(i915) >= PCH_LPT) {1805 if (HAS_PCH_LPT(i915))1806 panel->backlight.pwm_funcs = &lpt_pwm_funcs;1807 else1808 panel->backlight.pwm_funcs = &spt_pwm_funcs;1809 } else if (HAS_PCH_SPLIT(i915)) {1810 panel->backlight.pwm_funcs = &pch_pwm_funcs;1811 } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {1812 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {1813 panel->backlight.pwm_funcs = &ext_pwm_funcs;1814 } else {1815 panel->backlight.pwm_funcs = &vlv_pwm_funcs;1816 }1817 } else if (DISPLAY_VER(i915) == 4) {1818 panel->backlight.pwm_funcs = &i965_pwm_funcs;1819 } else {1820 panel->backlight.pwm_funcs = &i9xx_pwm_funcs;1821 }1822 1823 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {1824 if (intel_dp_aux_init_backlight_funcs(connector) == 0)1825 return;1826 1827 if (!intel_has_quirk(&i915->display, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))1828 connector->panel.backlight.power = intel_pps_backlight_power;1829 }1830 1831 /* We're using a standard PWM backlight interface */1832 panel->backlight.funcs = &pwm_bl_funcs;1833}1834