1/* 2 * Copyright © 2006-2010 Intel Corporation 3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie> 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: 25 * Eric Anholt <eric@anholt.net> 26 * Dave Airlie <airlied@linux.ie> 27 * Jesse Barnes <jesse.barnes@intel.com> 28 * Chris Wilson <chris@chris-wilson.co.uk> 29 */ 30 31#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 32 33#include <linux/kernel.h> 34#include <linux/moduleparam.h> 35#include "intel_drv.h" 36 37void 38intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode, 39 struct drm_display_mode *adjusted_mode) 40{ 41 drm_mode_copy(adjusted_mode, fixed_mode); 42 43 drm_mode_set_crtcinfo(adjusted_mode, 0); 44} 45 46/** 47 * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID 48 * @dev: drm device 49 * @fixed_mode : panel native mode 50 * @connector: LVDS/eDP connector 51 * 52 * Return downclock_avail 53 * Find the reduced downclock for LVDS/eDP in EDID. 54 */ 55struct drm_display_mode * 56intel_find_panel_downclock(struct drm_device *dev, 57 struct drm_display_mode *fixed_mode, 58 struct drm_connector *connector) 59{ 60 struct drm_display_mode *scan, *tmp_mode; 61 int temp_downclock; 62 63 temp_downclock = fixed_mode->clock; 64 tmp_mode = NULL; 65 66 list_for_each_entry(scan, &connector->probed_modes, head) { 67 /* 68 * If one mode has the same resolution with the fixed_panel 69 * mode while they have the different refresh rate, it means 70 * that the reduced downclock is found. In such 71 * case we can set the different FPx0/1 to dynamically select 72 * between low and high frequency. 73 */ 74 if (scan->hdisplay == fixed_mode->hdisplay && 75 scan->hsync_start == fixed_mode->hsync_start && 76 scan->hsync_end == fixed_mode->hsync_end && 77 scan->htotal == fixed_mode->htotal && 78 scan->vdisplay == fixed_mode->vdisplay && 79 scan->vsync_start == fixed_mode->vsync_start && 80 scan->vsync_end == fixed_mode->vsync_end && 81 scan->vtotal == fixed_mode->vtotal) { 82 if (scan->clock < temp_downclock) { 83 /* 84 * The downclock is already found. But we 85 * expect to find the lower downclock. 86 */ 87 temp_downclock = scan->clock; 88 tmp_mode = scan; 89 } 90 } 91 } 92 93 if (temp_downclock < fixed_mode->clock) 94 return drm_mode_duplicate(dev, tmp_mode); 95 else 96 return NULL; 97} 98 99/* adjusted_mode has been preset to be the panel's fixed mode */ 100void 101intel_pch_panel_fitting(struct intel_crtc *intel_crtc, 102 struct intel_crtc_state *pipe_config, 103 int fitting_mode) 104{ 105 struct drm_display_mode *adjusted_mode; 106 int x, y, width, height; 107 108 adjusted_mode = &pipe_config->base.adjusted_mode; 109 110 x = y = width = height = 0; 111 112 /* Native modes don't need fitting */ 113 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w && 114 adjusted_mode->vdisplay == pipe_config->pipe_src_h) 115 goto done; 116 117 switch (fitting_mode) { 118 case DRM_MODE_SCALE_CENTER: 119 width = pipe_config->pipe_src_w; 120 height = pipe_config->pipe_src_h; 121 x = (adjusted_mode->hdisplay - width + 1)/2; 122 y = (adjusted_mode->vdisplay - height + 1)/2; 123 break; 124 125 case DRM_MODE_SCALE_ASPECT: 126 /* Scale but preserve the aspect ratio */ 127 { 128 u32 scaled_width = adjusted_mode->hdisplay 129 * pipe_config->pipe_src_h; 130 u32 scaled_height = pipe_config->pipe_src_w 131 * adjusted_mode->vdisplay; 132 if (scaled_width > scaled_height) { /* pillar */ 133 width = scaled_height / pipe_config->pipe_src_h; 134 if (width & 1) 135 width++; 136 x = (adjusted_mode->hdisplay - width + 1) / 2; 137 y = 0; 138 height = adjusted_mode->vdisplay; 139 } else if (scaled_width < scaled_height) { /* letter */ 140 height = scaled_width / pipe_config->pipe_src_w; 141 if (height & 1) 142 height++; 143 y = (adjusted_mode->vdisplay - height + 1) / 2; 144 x = 0; 145 width = adjusted_mode->hdisplay; 146 } else { 147 x = y = 0; 148 width = adjusted_mode->hdisplay; 149 height = adjusted_mode->vdisplay; 150 } 151 } 152 break; 153 154 case DRM_MODE_SCALE_FULLSCREEN: 155 x = y = 0; 156 width = adjusted_mode->hdisplay; 157 height = adjusted_mode->vdisplay; 158 break; 159 160 default: 161 WARN(1, "bad panel fit mode: %d\n", fitting_mode); 162 return; 163 } 164 165done: 166 pipe_config->pch_pfit.pos = (x << 16) | y; 167 pipe_config->pch_pfit.size = (width << 16) | height; 168 pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0; 169} 170 171static void 172centre_horizontally(struct drm_display_mode *mode, 173 int width) 174{ 175 u32 border, sync_pos, blank_width, sync_width; 176 177 /* keep the hsync and hblank widths constant */ 178 sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start; 179 blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start; 180 sync_pos = (blank_width - sync_width + 1) / 2; 181 182 border = (mode->hdisplay - width + 1) / 2; 183 border += border & 1; /* make the border even */ 184 185 mode->crtc_hdisplay = width; 186 mode->crtc_hblank_start = width + border; 187 mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width; 188 189 mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos; 190 mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width; 191} 192 193static void 194centre_vertically(struct drm_display_mode *mode, 195 int height) 196{ 197 u32 border, sync_pos, blank_width, sync_width; 198 199 /* keep the vsync and vblank widths constant */ 200 sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start; 201 blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start; 202 sync_pos = (blank_width - sync_width + 1) / 2; 203 204 border = (mode->vdisplay - height + 1) / 2; 205 206 mode->crtc_vdisplay = height; 207 mode->crtc_vblank_start = height + border; 208 mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width; 209 210 mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos; 211 mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width; 212} 213 214static inline u32 panel_fitter_scaling(u32 source, u32 target) 215{ 216 /* 217 * Floating point operation is not supported. So the FACTOR 218 * is defined, which can avoid the floating point computation 219 * when calculating the panel ratio. 220 */ 221#define ACCURACY 12 222#define FACTOR (1 << ACCURACY) 223 u32 ratio = source * FACTOR / target; 224 return (FACTOR * ratio + FACTOR/2) / FACTOR; 225} 226 227static void i965_scale_aspect(struct intel_crtc_state *pipe_config, 228 u32 *pfit_control) 229{ 230 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode; 231 u32 scaled_width = adjusted_mode->hdisplay * 232 pipe_config->pipe_src_h; 233 u32 scaled_height = pipe_config->pipe_src_w * 234 adjusted_mode->vdisplay; 235 236 /* 965+ is easy, it does everything in hw */ 237 if (scaled_width > scaled_height) 238 *pfit_control |= PFIT_ENABLE | 239 PFIT_SCALING_PILLAR; 240 else if (scaled_width < scaled_height) 241 *pfit_control |= PFIT_ENABLE | 242 PFIT_SCALING_LETTER; 243 else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w) 244 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO; 245} 246 247static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config, 248 u32 *pfit_control, u32 *pfit_pgm_ratios, 249 u32 *border) 250{ 251 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode; 252 u32 scaled_width = adjusted_mode->hdisplay * 253 pipe_config->pipe_src_h; 254 u32 scaled_height = pipe_config->pipe_src_w * 255 adjusted_mode->vdisplay; 256 u32 bits; 257 258 /* 259 * For earlier chips we have to calculate the scaling 260 * ratio by hand and program it into the 261 * PFIT_PGM_RATIO register 262 */ 263 if (scaled_width > scaled_height) { /* pillar */ 264 centre_horizontally(adjusted_mode, 265 scaled_height / 266 pipe_config->pipe_src_h); 267 268 *border = LVDS_BORDER_ENABLE; 269 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) { 270 bits = panel_fitter_scaling(pipe_config->pipe_src_h, 271 adjusted_mode->vdisplay); 272 273 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT | 274 bits << PFIT_VERT_SCALE_SHIFT); 275 *pfit_control |= (PFIT_ENABLE | 276 VERT_INTERP_BILINEAR | 277 HORIZ_INTERP_BILINEAR); 278 } 279 } else if (scaled_width < scaled_height) { /* letter */ 280 centre_vertically(adjusted_mode, 281 scaled_width / 282 pipe_config->pipe_src_w); 283 284 *border = LVDS_BORDER_ENABLE; 285 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) { 286 bits = panel_fitter_scaling(pipe_config->pipe_src_w, 287 adjusted_mode->hdisplay); 288 289 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT | 290 bits << PFIT_VERT_SCALE_SHIFT); 291 *pfit_control |= (PFIT_ENABLE | 292 VERT_INTERP_BILINEAR | 293 HORIZ_INTERP_BILINEAR); 294 } 295 } else { 296 /* Aspects match, Let hw scale both directions */ 297 *pfit_control |= (PFIT_ENABLE | 298 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE | 299 VERT_INTERP_BILINEAR | 300 HORIZ_INTERP_BILINEAR); 301 } 302} 303 304void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc, 305 struct intel_crtc_state *pipe_config, 306 int fitting_mode) 307{ 308 struct drm_device *dev = intel_crtc->base.dev; 309 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0; 310 struct drm_display_mode *adjusted_mode; 311 312 adjusted_mode = &pipe_config->base.adjusted_mode; 313 314 /* Native modes don't need fitting */ 315 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w && 316 adjusted_mode->vdisplay == pipe_config->pipe_src_h) 317 goto out; 318 319 switch (fitting_mode) { 320 case DRM_MODE_SCALE_CENTER: 321 /* 322 * For centered modes, we have to calculate border widths & 323 * heights and modify the values programmed into the CRTC. 324 */ 325 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w); 326 centre_vertically(adjusted_mode, pipe_config->pipe_src_h); 327 border = LVDS_BORDER_ENABLE; 328 break; 329 case DRM_MODE_SCALE_ASPECT: 330 /* Scale but preserve the aspect ratio */ 331 if (INTEL_INFO(dev)->gen >= 4) 332 i965_scale_aspect(pipe_config, &pfit_control); 333 else 334 i9xx_scale_aspect(pipe_config, &pfit_control, 335 &pfit_pgm_ratios, &border); 336 break; 337 case DRM_MODE_SCALE_FULLSCREEN: 338 /* 339 * Full scaling, even if it changes the aspect ratio. 340 * Fortunately this is all done for us in hw. 341 */ 342 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay || 343 pipe_config->pipe_src_w != adjusted_mode->hdisplay) { 344 pfit_control |= PFIT_ENABLE; 345 if (INTEL_INFO(dev)->gen >= 4) 346 pfit_control |= PFIT_SCALING_AUTO; 347 else 348 pfit_control |= (VERT_AUTO_SCALE | 349 VERT_INTERP_BILINEAR | 350 HORIZ_AUTO_SCALE | 351 HORIZ_INTERP_BILINEAR); 352 } 353 break; 354 default: 355 WARN(1, "bad panel fit mode: %d\n", fitting_mode); 356 return; 357 } 358 359 /* 965+ wants fuzzy fitting */ 360 /* FIXME: handle multiple panels by failing gracefully */ 361 if (INTEL_INFO(dev)->gen >= 4) 362 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) | 363 PFIT_FILTER_FUZZY); 364 365out: 366 if ((pfit_control & PFIT_ENABLE) == 0) { 367 pfit_control = 0; 368 pfit_pgm_ratios = 0; 369 } 370 371 /* Make sure pre-965 set dither correctly for 18bpp panels. */ 372 if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18) 373 pfit_control |= PANEL_8TO6_DITHER_ENABLE; 374 375 pipe_config->gmch_pfit.control = pfit_control; 376 pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios; 377 pipe_config->gmch_pfit.lvds_border_bits = border; 378} 379 380enum drm_connector_status 381intel_panel_detect(struct drm_device *dev) 382{ 383 struct drm_i915_private *dev_priv = dev->dev_private; 384 385 /* Assume that the BIOS does not lie through the OpRegion... */ 386 if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) { 387 return ioread32(dev_priv->opregion.lid_state) & 0x1 ? 388 connector_status_connected : 389 connector_status_disconnected; 390 } 391 392 switch (i915.panel_ignore_lid) { 393 case -2: 394 return connector_status_connected; 395 case -1: 396 return connector_status_disconnected; 397 default: 398 return connector_status_unknown; 399 } 400} 401 402/** 403 * scale - scale values from one range to another 404 * 405 * @source_val: value in range [@source_min..@source_max] 406 * 407 * Return @source_val in range [@source_min..@source_max] scaled to range 408 * [@target_min..@target_max]. 409 */ 410static uint32_t scale(uint32_t source_val, 411 uint32_t source_min, uint32_t source_max, 412 uint32_t target_min, uint32_t target_max) 413{ 414 uint64_t target_val; 415 416 WARN_ON(source_min > source_max); 417 WARN_ON(target_min > target_max); 418 419 /* defensive */ 420 source_val = clamp(source_val, source_min, source_max); 421 422 /* avoid overflows */ 423 target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) * 424 (target_max - target_min), source_max - source_min); 425 target_val += target_min; 426 427 return target_val; 428} 429 430/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */ 431static inline u32 scale_user_to_hw(struct intel_connector *connector, 432 u32 user_level, u32 user_max) 433{ 434 struct intel_panel *panel = &connector->panel; 435 436 return scale(user_level, 0, user_max, 437 panel->backlight.min, panel->backlight.max); 438} 439 440/* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result 441 * to [hw_min..hw_max]. */ 442static inline u32 clamp_user_to_hw(struct intel_connector *connector, 443 u32 user_level, u32 user_max) 444{ 445 struct intel_panel *panel = &connector->panel; 446 u32 hw_level; 447 448 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max); 449 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max); 450 451 return hw_level; 452} 453 454/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */ 455static inline u32 scale_hw_to_user(struct intel_connector *connector, 456 u32 hw_level, u32 user_max) 457{ 458 struct intel_panel *panel = &connector->panel; 459 460 return scale(hw_level, panel->backlight.min, panel->backlight.max, 461 0, user_max); 462} 463 464static u32 intel_panel_compute_brightness(struct intel_connector *connector, 465 u32 val) 466{ 467 struct drm_device *dev = connector->base.dev; 468 struct drm_i915_private *dev_priv = dev->dev_private; 469 struct intel_panel *panel = &connector->panel; 470 471 WARN_ON(panel->backlight.max == 0); 472 473 if (i915.invert_brightness < 0) 474 return val; 475 476 if (i915.invert_brightness > 0 || 477 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) { 478 return panel->backlight.max - val; 479 } 480 481 return val; 482} 483 484static u32 bdw_get_backlight(struct intel_connector *connector) 485{ 486 struct drm_device *dev = connector->base.dev; 487 struct drm_i915_private *dev_priv = dev->dev_private; 488 489 return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK; 490} 491 492static u32 pch_get_backlight(struct intel_connector *connector) 493{ 494 struct drm_device *dev = connector->base.dev; 495 struct drm_i915_private *dev_priv = dev->dev_private; 496 497 return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 498} 499 500static u32 i9xx_get_backlight(struct intel_connector *connector) 501{ 502 struct drm_device *dev = connector->base.dev; 503 struct drm_i915_private *dev_priv = dev->dev_private; 504 struct intel_panel *panel = &connector->panel; 505 u32 val; 506 507 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 508 if (INTEL_INFO(dev)->gen < 4) 509 val >>= 1; 510 511 if (panel->backlight.combination_mode) { 512 u8 lbpc; 513 514 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc); 515 val *= lbpc; 516 } 517 518 return val; 519} 520 521static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe) 522{ 523 struct drm_i915_private *dev_priv = dev->dev_private; 524 525 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 526 return 0; 527 528 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK; 529} 530 531static u32 vlv_get_backlight(struct intel_connector *connector) 532{ 533 struct drm_device *dev = connector->base.dev; 534 enum pipe pipe = intel_get_pipe_from_connector(connector); 535 536 return _vlv_get_backlight(dev, pipe); 537} 538 539static u32 intel_panel_get_backlight(struct intel_connector *connector) 540{ 541 struct drm_device *dev = connector->base.dev; 542 struct drm_i915_private *dev_priv = dev->dev_private; 543 struct intel_panel *panel = &connector->panel; 544 u32 val = 0; 545 546 mutex_lock(&dev_priv->backlight_lock); 547 548 if (panel->backlight.enabled) { 549 val = dev_priv->display.get_backlight(connector); 550 val = intel_panel_compute_brightness(connector, val); 551 } 552 553 mutex_unlock(&dev_priv->backlight_lock); 554 555 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); 556 return val; 557} 558 559static void bdw_set_backlight(struct intel_connector *connector, u32 level) 560{ 561 struct drm_device *dev = connector->base.dev; 562 struct drm_i915_private *dev_priv = dev->dev_private; 563 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK; 564 I915_WRITE(BLC_PWM_PCH_CTL2, val | level); 565} 566 567static void pch_set_backlight(struct intel_connector *connector, u32 level) 568{ 569 struct drm_device *dev = connector->base.dev; 570 struct drm_i915_private *dev_priv = dev->dev_private; 571 u32 tmp; 572 573 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 574 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level); 575} 576 577static void i9xx_set_backlight(struct intel_connector *connector, u32 level) 578{ 579 struct drm_device *dev = connector->base.dev; 580 struct drm_i915_private *dev_priv = dev->dev_private; 581 struct intel_panel *panel = &connector->panel; 582 u32 tmp, mask; 583 584 WARN_ON(panel->backlight.max == 0); 585 586 if (panel->backlight.combination_mode) { 587 u8 lbpc; 588 589 lbpc = level * 0xfe / panel->backlight.max + 1; 590 level /= lbpc; 591 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc); 592 } 593 594 if (IS_GEN4(dev)) { 595 mask = BACKLIGHT_DUTY_CYCLE_MASK; 596 } else { 597 level <<= 1; 598 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV; 599 } 600 601 tmp = I915_READ(BLC_PWM_CTL) & ~mask; 602 I915_WRITE(BLC_PWM_CTL, tmp | level); 603} 604 605static void vlv_set_backlight(struct intel_connector *connector, u32 level) 606{ 607 struct drm_device *dev = connector->base.dev; 608 struct drm_i915_private *dev_priv = dev->dev_private; 609 enum pipe pipe = intel_get_pipe_from_connector(connector); 610 u32 tmp; 611 612 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 613 return; 614 615 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK; 616 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level); 617} 618 619static void 620intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level) 621{ 622 struct drm_device *dev = connector->base.dev; 623 struct drm_i915_private *dev_priv = dev->dev_private; 624 625 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); 626 627 level = intel_panel_compute_brightness(connector, level); 628 dev_priv->display.set_backlight(connector, level); 629} 630 631/* set backlight brightness to level in range [0..max], scaling wrt hw min */ 632static void intel_panel_set_backlight(struct intel_connector *connector, 633 u32 user_level, u32 user_max) 634{ 635 struct drm_device *dev = connector->base.dev; 636 struct drm_i915_private *dev_priv = dev->dev_private; 637 struct intel_panel *panel = &connector->panel; 638 u32 hw_level; 639 640 if (!panel->backlight.present) 641 return; 642 643 mutex_lock(&dev_priv->backlight_lock); 644 645 WARN_ON(panel->backlight.max == 0); 646 647 hw_level = scale_user_to_hw(connector, user_level, user_max); 648 panel->backlight.level = hw_level; 649 650 if (panel->backlight.enabled) 651 intel_panel_actually_set_backlight(connector, hw_level); 652 653 mutex_unlock(&dev_priv->backlight_lock); 654} 655 656/* set backlight brightness to level in range [0..max], assuming hw min is 657 * respected. 658 */ 659void intel_panel_set_backlight_acpi(struct intel_connector *connector, 660 u32 user_level, u32 user_max) 661{ 662 struct drm_device *dev = connector->base.dev; 663 struct drm_i915_private *dev_priv = dev->dev_private; 664 struct intel_panel *panel = &connector->panel; 665 enum pipe pipe = intel_get_pipe_from_connector(connector); 666 u32 hw_level; 667 668 /* 669 * INVALID_PIPE may occur during driver init because 670 * connection_mutex isn't held across the entire backlight 671 * setup + modeset readout, and the BIOS can issue the 672 * requests at any time. 673 */ 674 if (!panel->backlight.present || pipe == INVALID_PIPE) 675 return; 676 677 mutex_lock(&dev_priv->backlight_lock); 678 679 WARN_ON(panel->backlight.max == 0); 680 681 hw_level = clamp_user_to_hw(connector, user_level, user_max); 682 panel->backlight.level = hw_level; 683 684 if (panel->backlight.device) 685 panel->backlight.device->props.brightness = 686 scale_hw_to_user(connector, 687 panel->backlight.level, 688 panel->backlight.device->props.max_brightness); 689 690 if (panel->backlight.enabled) 691 intel_panel_actually_set_backlight(connector, hw_level); 692 693 mutex_unlock(&dev_priv->backlight_lock); 694} 695 696static void pch_disable_backlight(struct intel_connector *connector) 697{ 698 struct drm_device *dev = connector->base.dev; 699 struct drm_i915_private *dev_priv = dev->dev_private; 700 u32 tmp; 701 702 intel_panel_actually_set_backlight(connector, 0); 703 704 tmp = I915_READ(BLC_PWM_CPU_CTL2); 705 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE); 706 707 tmp = I915_READ(BLC_PWM_PCH_CTL1); 708 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE); 709} 710 711static void i9xx_disable_backlight(struct intel_connector *connector) 712{ 713 intel_panel_actually_set_backlight(connector, 0); 714} 715 716static void i965_disable_backlight(struct intel_connector *connector) 717{ 718 struct drm_device *dev = connector->base.dev; 719 struct drm_i915_private *dev_priv = dev->dev_private; 720 u32 tmp; 721 722 intel_panel_actually_set_backlight(connector, 0); 723 724 tmp = I915_READ(BLC_PWM_CTL2); 725 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE); 726} 727 728static void vlv_disable_backlight(struct intel_connector *connector) 729{ 730 struct drm_device *dev = connector->base.dev; 731 struct drm_i915_private *dev_priv = dev->dev_private; 732 enum pipe pipe = intel_get_pipe_from_connector(connector); 733 u32 tmp; 734 735 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 736 return; 737 738 intel_panel_actually_set_backlight(connector, 0); 739 740 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe)); 741 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE); 742} 743 744void intel_panel_disable_backlight(struct intel_connector *connector) 745{ 746 struct drm_device *dev = connector->base.dev; 747 struct drm_i915_private *dev_priv = dev->dev_private; 748 struct intel_panel *panel = &connector->panel; 749 750 if (!panel->backlight.present) 751 return; 752 753 /* 754 * Do not disable backlight on the vgaswitcheroo path. When switching 755 * away from i915, the other client may depend on i915 to handle the 756 * backlight. This will leave the backlight on unnecessarily when 757 * another client is not activated. 758 */ 759 if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) { 760 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n"); 761 return; 762 } 763 764 mutex_lock(&dev_priv->backlight_lock); 765 766 if (panel->backlight.device) 767 panel->backlight.device->props.power = FB_BLANK_POWERDOWN; 768 panel->backlight.enabled = false; 769 dev_priv->display.disable_backlight(connector); 770 771 mutex_unlock(&dev_priv->backlight_lock); 772} 773 774static void bdw_enable_backlight(struct intel_connector *connector) 775{ 776 struct drm_device *dev = connector->base.dev; 777 struct drm_i915_private *dev_priv = dev->dev_private; 778 struct intel_panel *panel = &connector->panel; 779 u32 pch_ctl1, pch_ctl2; 780 781 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 782 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { 783 DRM_DEBUG_KMS("pch backlight already enabled\n"); 784 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; 785 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 786 } 787 788 pch_ctl2 = panel->backlight.max << 16; 789 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2); 790 791 pch_ctl1 = 0; 792 if (panel->backlight.active_low_pwm) 793 pch_ctl1 |= BLM_PCH_POLARITY; 794 795 /* After LPT, override is the default. */ 796 if (HAS_PCH_LPT(dev_priv)) 797 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE; 798 799 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 800 POSTING_READ(BLC_PWM_PCH_CTL1); 801 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE); 802 803 /* This won't stick until the above enable. */ 804 intel_panel_actually_set_backlight(connector, panel->backlight.level); 805} 806 807static void pch_enable_backlight(struct intel_connector *connector) 808{ 809 struct drm_device *dev = connector->base.dev; 810 struct drm_i915_private *dev_priv = dev->dev_private; 811 struct intel_panel *panel = &connector->panel; 812 enum pipe pipe = intel_get_pipe_from_connector(connector); 813 enum transcoder cpu_transcoder = 814 intel_pipe_to_cpu_transcoder(dev_priv, pipe); 815 u32 cpu_ctl2, pch_ctl1, pch_ctl2; 816 817 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2); 818 if (cpu_ctl2 & BLM_PWM_ENABLE) { 819 DRM_DEBUG_KMS("cpu backlight already enabled\n"); 820 cpu_ctl2 &= ~BLM_PWM_ENABLE; 821 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2); 822 } 823 824 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 825 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { 826 DRM_DEBUG_KMS("pch backlight already enabled\n"); 827 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; 828 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 829 } 830 831 if (cpu_transcoder == TRANSCODER_EDP) 832 cpu_ctl2 = BLM_TRANSCODER_EDP; 833 else 834 cpu_ctl2 = BLM_PIPE(cpu_transcoder); 835 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2); 836 POSTING_READ(BLC_PWM_CPU_CTL2); 837 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE); 838 839 /* This won't stick until the above enable. */ 840 intel_panel_actually_set_backlight(connector, panel->backlight.level); 841 842 pch_ctl2 = panel->backlight.max << 16; 843 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2); 844 845 pch_ctl1 = 0; 846 if (panel->backlight.active_low_pwm) 847 pch_ctl1 |= BLM_PCH_POLARITY; 848 849 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 850 POSTING_READ(BLC_PWM_PCH_CTL1); 851 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE); 852} 853 854static void i9xx_enable_backlight(struct intel_connector *connector) 855{ 856 struct drm_device *dev = connector->base.dev; 857 struct drm_i915_private *dev_priv = dev->dev_private; 858 struct intel_panel *panel = &connector->panel; 859 u32 ctl, freq; 860 861 ctl = I915_READ(BLC_PWM_CTL); 862 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) { 863 DRM_DEBUG_KMS("backlight already enabled\n"); 864 I915_WRITE(BLC_PWM_CTL, 0); 865 } 866 867 freq = panel->backlight.max; 868 if (panel->backlight.combination_mode) 869 freq /= 0xff; 870 871 ctl = freq << 17; 872 if (panel->backlight.combination_mode) 873 ctl |= BLM_LEGACY_MODE; 874 if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm) 875 ctl |= BLM_POLARITY_PNV; 876 877 I915_WRITE(BLC_PWM_CTL, ctl); 878 POSTING_READ(BLC_PWM_CTL); 879 880 /* XXX: combine this into above write? */ 881 intel_panel_actually_set_backlight(connector, panel->backlight.level); 882 883 /* 884 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is 885 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2 886 * that has backlight. 887 */ 888 if (IS_GEN2(dev)) 889 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE); 890} 891 892static void i965_enable_backlight(struct intel_connector *connector) 893{ 894 struct drm_device *dev = connector->base.dev; 895 struct drm_i915_private *dev_priv = dev->dev_private; 896 struct intel_panel *panel = &connector->panel; 897 enum pipe pipe = intel_get_pipe_from_connector(connector); 898 u32 ctl, ctl2, freq; 899 900 ctl2 = I915_READ(BLC_PWM_CTL2); 901 if (ctl2 & BLM_PWM_ENABLE) { 902 DRM_DEBUG_KMS("backlight already enabled\n"); 903 ctl2 &= ~BLM_PWM_ENABLE; 904 I915_WRITE(BLC_PWM_CTL2, ctl2); 905 } 906 907 freq = panel->backlight.max; 908 if (panel->backlight.combination_mode) 909 freq /= 0xff; 910 911 ctl = freq << 16; 912 I915_WRITE(BLC_PWM_CTL, ctl); 913 914 ctl2 = BLM_PIPE(pipe); 915 if (panel->backlight.combination_mode) 916 ctl2 |= BLM_COMBINATION_MODE; 917 if (panel->backlight.active_low_pwm) 918 ctl2 |= BLM_POLARITY_I965; 919 I915_WRITE(BLC_PWM_CTL2, ctl2); 920 POSTING_READ(BLC_PWM_CTL2); 921 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE); 922 923 intel_panel_actually_set_backlight(connector, panel->backlight.level); 924} 925 926static void vlv_enable_backlight(struct intel_connector *connector) 927{ 928 struct drm_device *dev = connector->base.dev; 929 struct drm_i915_private *dev_priv = dev->dev_private; 930 struct intel_panel *panel = &connector->panel; 931 enum pipe pipe = intel_get_pipe_from_connector(connector); 932 u32 ctl, ctl2; 933 934 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 935 return; 936 937 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe)); 938 if (ctl2 & BLM_PWM_ENABLE) { 939 DRM_DEBUG_KMS("backlight already enabled\n"); 940 ctl2 &= ~BLM_PWM_ENABLE; 941 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2); 942 } 943 944 ctl = panel->backlight.max << 16; 945 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl); 946 947 /* XXX: combine this into above write? */ 948 intel_panel_actually_set_backlight(connector, panel->backlight.level); 949 950 ctl2 = 0; 951 if (panel->backlight.active_low_pwm) 952 ctl2 |= BLM_POLARITY_I965; 953 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2); 954 POSTING_READ(VLV_BLC_PWM_CTL2(pipe)); 955 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE); 956} 957 958void intel_panel_enable_backlight(struct intel_connector *connector) 959{ 960 struct drm_device *dev = connector->base.dev; 961 struct drm_i915_private *dev_priv = dev->dev_private; 962 struct intel_panel *panel = &connector->panel; 963 enum pipe pipe = intel_get_pipe_from_connector(connector); 964 965 if (!panel->backlight.present) 966 return; 967 968 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe)); 969 970 mutex_lock(&dev_priv->backlight_lock); 971 972 WARN_ON(panel->backlight.max == 0); 973 974 if (panel->backlight.level <= panel->backlight.min) { 975 panel->backlight.level = panel->backlight.max; 976 if (panel->backlight.device) 977 panel->backlight.device->props.brightness = 978 scale_hw_to_user(connector, 979 panel->backlight.level, 980 panel->backlight.device->props.max_brightness); 981 } 982 983 dev_priv->display.enable_backlight(connector); 984 panel->backlight.enabled = true; 985 if (panel->backlight.device) 986 panel->backlight.device->props.power = FB_BLANK_UNBLANK; 987 988 mutex_unlock(&dev_priv->backlight_lock); 989} 990 991#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) 992static int intel_backlight_device_update_status(struct backlight_device *bd) 993{ 994 struct intel_connector *connector = bl_get_data(bd); 995 struct intel_panel *panel = &connector->panel; 996 struct drm_device *dev = connector->base.dev; 997 998 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 999 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n", 1000 bd->props.brightness, bd->props.max_brightness); 1001 intel_panel_set_backlight(connector, bd->props.brightness, 1002 bd->props.max_brightness); 1003 1004 /* 1005 * Allow flipping bl_power as a sub-state of enabled. Sadly the 1006 * backlight class device does not make it easy to to differentiate 1007 * between callbacks for brightness and bl_power, so our backlight_power 1008 * callback needs to take this into account. 1009 */ 1010 if (panel->backlight.enabled) { 1011 if (panel->backlight_power) { 1012 bool enable = bd->props.power == FB_BLANK_UNBLANK && 1013 bd->props.brightness != 0; 1014 panel->backlight_power(connector, enable); 1015 } 1016 } else { 1017 bd->props.power = FB_BLANK_POWERDOWN; 1018 } 1019 1020 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1021 return 0; 1022} 1023 1024static int intel_backlight_device_get_brightness(struct backlight_device *bd) 1025{ 1026 struct intel_connector *connector = bl_get_data(bd); 1027 struct drm_device *dev = connector->base.dev; 1028 struct drm_i915_private *dev_priv = dev->dev_private; 1029 u32 hw_level; 1030 int ret; 1031 1032 intel_runtime_pm_get(dev_priv); 1033 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 1034 1035 hw_level = intel_panel_get_backlight(connector); 1036 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness); 1037 1038 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1039 intel_runtime_pm_put(dev_priv); 1040 1041 return ret; 1042} 1043 1044static const struct backlight_ops intel_backlight_device_ops = { 1045 .update_status = intel_backlight_device_update_status, 1046 .get_brightness = intel_backlight_device_get_brightness, 1047}; 1048 1049static int intel_backlight_device_register(struct intel_connector *connector) 1050{ 1051 struct intel_panel *panel = &connector->panel; 1052 struct backlight_properties props; 1053 1054 if (WARN_ON(panel->backlight.device)) 1055 return -ENODEV; 1056 1057 if (!panel->backlight.present) 1058 return 0; 1059 1060 WARN_ON(panel->backlight.max == 0); 1061 1062 memset(&props, 0, sizeof(props)); 1063 props.type = BACKLIGHT_RAW; 1064 1065 /* 1066 * Note: Everything should work even if the backlight device max 1067 * presented to the userspace is arbitrarily chosen. 1068 */ 1069 props.max_brightness = panel->backlight.max; 1070 props.brightness = scale_hw_to_user(connector, 1071 panel->backlight.level, 1072 props.max_brightness); 1073 1074 if (panel->backlight.enabled) 1075 props.power = FB_BLANK_UNBLANK; 1076 else 1077 props.power = FB_BLANK_POWERDOWN; 1078 1079 /* 1080 * Note: using the same name independent of the connector prevents 1081 * registration of multiple backlight devices in the driver. 1082 */ 1083 panel->backlight.device = 1084 backlight_device_register("intel_backlight", 1085 connector->base.kdev, 1086 connector, 1087 &intel_backlight_device_ops, &props); 1088 1089 if (IS_ERR(panel->backlight.device)) { 1090 DRM_ERROR("Failed to register backlight: %ld\n", 1091 PTR_ERR(panel->backlight.device)); 1092 panel->backlight.device = NULL; 1093 return -ENODEV; 1094 } 1095 1096 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n", 1097 connector->base.name); 1098 1099 return 0; 1100} 1101 1102static void intel_backlight_device_unregister(struct intel_connector *connector) 1103{ 1104 struct intel_panel *panel = &connector->panel; 1105 1106 if (panel->backlight.device) { 1107 backlight_device_unregister(panel->backlight.device); 1108 panel->backlight.device = NULL; 1109 } 1110} 1111#else /* CONFIG_BACKLIGHT_CLASS_DEVICE */ 1112static int intel_backlight_device_register(struct intel_connector *connector) 1113{ 1114 return 0; 1115} 1116static void intel_backlight_device_unregister(struct intel_connector *connector) 1117{ 1118} 1119#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */ 1120 1121/* 1122 * Note: The setup hooks can't assume pipe is set! 1123 * 1124 * XXX: Query mode clock or hardware clock and program PWM modulation frequency 1125 * appropriately when it's 0. Use VBT and/or sane defaults. 1126 */ 1127static u32 get_backlight_min_vbt(struct intel_connector *connector) 1128{ 1129 struct drm_device *dev = connector->base.dev; 1130 struct drm_i915_private *dev_priv = dev->dev_private; 1131 struct intel_panel *panel = &connector->panel; 1132 int min; 1133 1134 WARN_ON(panel->backlight.max == 0); 1135 1136 /* 1137 * XXX: If the vbt value is 255, it makes min equal to max, which leads 1138 * to problems. There are such machines out there. Either our 1139 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard 1140 * against this by letting the minimum be at most (arbitrarily chosen) 1141 * 25% of the max. 1142 */ 1143 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64); 1144 if (min != dev_priv->vbt.backlight.min_brightness) { 1145 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n", 1146 dev_priv->vbt.backlight.min_brightness, min); 1147 } 1148 1149 /* vbt value is a coefficient in range [0..255] */ 1150 return scale(min, 0, 255, 0, panel->backlight.max); 1151} 1152 1153static int bdw_setup_backlight(struct intel_connector *connector, enum pipe unused) 1154{ 1155 struct drm_device *dev = connector->base.dev; 1156 struct drm_i915_private *dev_priv = dev->dev_private; 1157 struct intel_panel *panel = &connector->panel; 1158 u32 pch_ctl1, pch_ctl2, val; 1159 1160 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 1161 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY; 1162 1163 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2); 1164 panel->backlight.max = pch_ctl2 >> 16; 1165 if (!panel->backlight.max) 1166 return -ENODEV; 1167 1168 panel->backlight.min = get_backlight_min_vbt(connector); 1169 1170 val = bdw_get_backlight(connector); 1171 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1172 1173 panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) && 1174 panel->backlight.level != 0; 1175 1176 return 0; 1177} 1178 1179static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused) 1180{ 1181 struct drm_device *dev = connector->base.dev; 1182 struct drm_i915_private *dev_priv = dev->dev_private; 1183 struct intel_panel *panel = &connector->panel; 1184 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val; 1185 1186 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 1187 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY; 1188 1189 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2); 1190 panel->backlight.max = pch_ctl2 >> 16; 1191 if (!panel->backlight.max) 1192 return -ENODEV; 1193 1194 panel->backlight.min = get_backlight_min_vbt(connector); 1195 1196 val = pch_get_backlight(connector); 1197 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1198 1199 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2); 1200 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) && 1201 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0; 1202 1203 return 0; 1204} 1205 1206static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused) 1207{ 1208 struct drm_device *dev = connector->base.dev; 1209 struct drm_i915_private *dev_priv = dev->dev_private; 1210 struct intel_panel *panel = &connector->panel; 1211 u32 ctl, val; 1212 1213 ctl = I915_READ(BLC_PWM_CTL); 1214 1215 if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev)) 1216 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE; 1217 1218 if (IS_PINEVIEW(dev)) 1219 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV; 1220 1221 panel->backlight.max = ctl >> 17; 1222 if (panel->backlight.combination_mode) 1223 panel->backlight.max *= 0xff; 1224 1225 if (!panel->backlight.max) 1226 return -ENODEV; 1227 1228 panel->backlight.min = get_backlight_min_vbt(connector); 1229 1230 val = i9xx_get_backlight(connector); 1231 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1232 1233 panel->backlight.enabled = panel->backlight.level != 0; 1234 1235 return 0; 1236} 1237 1238static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused) 1239{ 1240 struct drm_device *dev = connector->base.dev; 1241 struct drm_i915_private *dev_priv = dev->dev_private; 1242 struct intel_panel *panel = &connector->panel; 1243 u32 ctl, ctl2, val; 1244 1245 ctl2 = I915_READ(BLC_PWM_CTL2); 1246 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE; 1247 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965; 1248 1249 ctl = I915_READ(BLC_PWM_CTL); 1250 panel->backlight.max = ctl >> 16; 1251 if (panel->backlight.combination_mode) 1252 panel->backlight.max *= 0xff; 1253 1254 if (!panel->backlight.max) 1255 return -ENODEV; 1256 1257 panel->backlight.min = get_backlight_min_vbt(connector); 1258 1259 val = i9xx_get_backlight(connector); 1260 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1261 1262 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) && 1263 panel->backlight.level != 0; 1264 1265 return 0; 1266} 1267 1268static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe) 1269{ 1270 struct drm_device *dev = connector->base.dev; 1271 struct drm_i915_private *dev_priv = dev->dev_private; 1272 struct intel_panel *panel = &connector->panel; 1273 enum pipe p; 1274 u32 ctl, ctl2, val; 1275 1276 for_each_pipe(dev_priv, p) { 1277 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p)); 1278 1279 /* Skip if the modulation freq is already set */ 1280 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK) 1281 continue; 1282 1283 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK; 1284 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) | 1285 cur_val); 1286 } 1287 1288 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 1289 return -ENODEV; 1290 1291 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe)); 1292 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965; 1293 1294 ctl = I915_READ(VLV_BLC_PWM_CTL(pipe)); 1295 panel->backlight.max = ctl >> 16; 1296 if (!panel->backlight.max) 1297 return -ENODEV; 1298 1299 panel->backlight.min = get_backlight_min_vbt(connector); 1300 1301 val = _vlv_get_backlight(dev, pipe); 1302 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1303 1304 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) && 1305 panel->backlight.level != 0; 1306 1307 return 0; 1308} 1309 1310int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe) 1311{ 1312 struct drm_device *dev = connector->dev; 1313 struct drm_i915_private *dev_priv = dev->dev_private; 1314 struct intel_connector *intel_connector = to_intel_connector(connector); 1315 struct intel_panel *panel = &intel_connector->panel; 1316 int ret; 1317 1318 if (!dev_priv->vbt.backlight.present) { 1319 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) { 1320 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n"); 1321 } else { 1322 DRM_DEBUG_KMS("no backlight present per VBT\n"); 1323 return 0; 1324 } 1325 } 1326 1327 /* set level and max in panel struct */ 1328 mutex_lock(&dev_priv->backlight_lock); 1329 ret = dev_priv->display.setup_backlight(intel_connector, pipe); 1330 mutex_unlock(&dev_priv->backlight_lock); 1331 1332 if (ret) { 1333 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n", 1334 connector->name); 1335 return ret; 1336 } 1337 1338 panel->backlight.present = true; 1339 1340 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n", 1341 connector->name, 1342 panel->backlight.enabled ? "enabled" : "disabled", 1343 panel->backlight.level, panel->backlight.max); 1344 1345 return 0; 1346} 1347 1348void intel_panel_destroy_backlight(struct drm_connector *connector) 1349{ 1350 struct intel_connector *intel_connector = to_intel_connector(connector); 1351 struct intel_panel *panel = &intel_connector->panel; 1352 1353 panel->backlight.present = false; 1354} 1355 1356/* Set up chip specific backlight functions */ 1357void intel_panel_init_backlight_funcs(struct drm_device *dev) 1358{ 1359 struct drm_i915_private *dev_priv = dev->dev_private; 1360 1361 if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) { 1362 dev_priv->display.setup_backlight = bdw_setup_backlight; 1363 dev_priv->display.enable_backlight = bdw_enable_backlight; 1364 dev_priv->display.disable_backlight = pch_disable_backlight; 1365 dev_priv->display.set_backlight = bdw_set_backlight; 1366 dev_priv->display.get_backlight = bdw_get_backlight; 1367 } else if (HAS_PCH_SPLIT(dev)) { 1368 dev_priv->display.setup_backlight = pch_setup_backlight; 1369 dev_priv->display.enable_backlight = pch_enable_backlight; 1370 dev_priv->display.disable_backlight = pch_disable_backlight; 1371 dev_priv->display.set_backlight = pch_set_backlight; 1372 dev_priv->display.get_backlight = pch_get_backlight; 1373 } else if (IS_VALLEYVIEW(dev)) { 1374 dev_priv->display.setup_backlight = vlv_setup_backlight; 1375 dev_priv->display.enable_backlight = vlv_enable_backlight; 1376 dev_priv->display.disable_backlight = vlv_disable_backlight; 1377 dev_priv->display.set_backlight = vlv_set_backlight; 1378 dev_priv->display.get_backlight = vlv_get_backlight; 1379 } else if (IS_GEN4(dev)) { 1380 dev_priv->display.setup_backlight = i965_setup_backlight; 1381 dev_priv->display.enable_backlight = i965_enable_backlight; 1382 dev_priv->display.disable_backlight = i965_disable_backlight; 1383 dev_priv->display.set_backlight = i9xx_set_backlight; 1384 dev_priv->display.get_backlight = i9xx_get_backlight; 1385 } else { 1386 dev_priv->display.setup_backlight = i9xx_setup_backlight; 1387 dev_priv->display.enable_backlight = i9xx_enable_backlight; 1388 dev_priv->display.disable_backlight = i9xx_disable_backlight; 1389 dev_priv->display.set_backlight = i9xx_set_backlight; 1390 dev_priv->display.get_backlight = i9xx_get_backlight; 1391 } 1392} 1393 1394int intel_panel_init(struct intel_panel *panel, 1395 struct drm_display_mode *fixed_mode, 1396 struct drm_display_mode *downclock_mode) 1397{ 1398 panel->fixed_mode = fixed_mode; 1399 panel->downclock_mode = downclock_mode; 1400 1401 return 0; 1402} 1403 1404void intel_panel_fini(struct intel_panel *panel) 1405{ 1406 struct intel_connector *intel_connector = 1407 container_of(panel, struct intel_connector, panel); 1408 1409 if (panel->fixed_mode) 1410 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 1411 1412 if (panel->downclock_mode) 1413 drm_mode_destroy(intel_connector->base.dev, 1414 panel->downclock_mode); 1415} 1416 1417void intel_backlight_register(struct drm_device *dev) 1418{ 1419 struct intel_connector *connector; 1420 1421 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head) 1422 intel_backlight_device_register(connector); 1423} 1424 1425void intel_backlight_unregister(struct drm_device *dev) 1426{ 1427 struct intel_connector *connector; 1428 1429 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head) 1430 intel_backlight_device_unregister(connector); 1431} 1432