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 #include <linux/moduleparam.h> 32 #include "intel_drv.h" 33 34 void 35 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode, 36 struct drm_display_mode *adjusted_mode) 37 { 38 drm_mode_copy(adjusted_mode, fixed_mode); 39 40 drm_mode_set_crtcinfo(adjusted_mode, 0); 41 } 42 43 /** 44 * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID 45 * @dev: drm device 46 * @fixed_mode : panel native mode 47 * @connector: LVDS/eDP connector 48 * 49 * Return downclock_avail 50 * Find the reduced downclock for LVDS/eDP in EDID. 51 */ 52 struct drm_display_mode * 53 intel_find_panel_downclock(struct drm_device *dev, 54 struct drm_display_mode *fixed_mode, 55 struct drm_connector *connector) 56 { 57 struct drm_display_mode *scan, *tmp_mode; 58 int temp_downclock; 59 60 temp_downclock = fixed_mode->clock; 61 tmp_mode = NULL; 62 63 list_for_each_entry(scan, &connector->probed_modes, head) { 64 /* 65 * If one mode has the same resolution with the fixed_panel 66 * mode while they have the different refresh rate, it means 67 * that the reduced downclock is found. In such 68 * case we can set the different FPx0/1 to dynamically select 69 * between low and high frequency. 70 */ 71 if (scan->hdisplay == fixed_mode->hdisplay && 72 scan->hsync_start == fixed_mode->hsync_start && 73 scan->hsync_end == fixed_mode->hsync_end && 74 scan->htotal == fixed_mode->htotal && 75 scan->vdisplay == fixed_mode->vdisplay && 76 scan->vsync_start == fixed_mode->vsync_start && 77 scan->vsync_end == fixed_mode->vsync_end && 78 scan->vtotal == fixed_mode->vtotal) { 79 if (scan->clock < temp_downclock) { 80 /* 81 * The downclock is already found. But we 82 * expect to find the lower downclock. 83 */ 84 temp_downclock = scan->clock; 85 tmp_mode = scan; 86 } 87 } 88 } 89 90 if (temp_downclock < fixed_mode->clock) 91 return drm_mode_duplicate(dev, tmp_mode); 92 else 93 return NULL; 94 } 95 96 /* adjusted_mode has been preset to be the panel's fixed mode */ 97 void 98 intel_pch_panel_fitting(struct intel_crtc *intel_crtc, 99 struct intel_crtc_config *pipe_config, 100 int fitting_mode) 101 { 102 struct drm_display_mode *adjusted_mode; 103 int x, y, width, height; 104 105 adjusted_mode = &pipe_config->adjusted_mode; 106 107 x = y = width = height = 0; 108 109 /* Native modes don't need fitting */ 110 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w && 111 adjusted_mode->vdisplay == pipe_config->pipe_src_h) 112 goto done; 113 114 switch (fitting_mode) { 115 case DRM_MODE_SCALE_CENTER: 116 width = pipe_config->pipe_src_w; 117 height = pipe_config->pipe_src_h; 118 x = (adjusted_mode->hdisplay - width + 1)/2; 119 y = (adjusted_mode->vdisplay - height + 1)/2; 120 break; 121 122 case DRM_MODE_SCALE_ASPECT: 123 /* Scale but preserve the aspect ratio */ 124 { 125 u32 scaled_width = adjusted_mode->hdisplay 126 * pipe_config->pipe_src_h; 127 u32 scaled_height = pipe_config->pipe_src_w 128 * adjusted_mode->vdisplay; 129 if (scaled_width > scaled_height) { /* pillar */ 130 width = scaled_height / pipe_config->pipe_src_h; 131 if (width & 1) 132 width++; 133 x = (adjusted_mode->hdisplay - width + 1) / 2; 134 y = 0; 135 height = adjusted_mode->vdisplay; 136 } else if (scaled_width < scaled_height) { /* letter */ 137 height = scaled_width / pipe_config->pipe_src_w; 138 if (height & 1) 139 height++; 140 y = (adjusted_mode->vdisplay - height + 1) / 2; 141 x = 0; 142 width = adjusted_mode->hdisplay; 143 } else { 144 x = y = 0; 145 width = adjusted_mode->hdisplay; 146 height = adjusted_mode->vdisplay; 147 } 148 } 149 break; 150 151 case DRM_MODE_SCALE_FULLSCREEN: 152 x = y = 0; 153 width = adjusted_mode->hdisplay; 154 height = adjusted_mode->vdisplay; 155 break; 156 157 default: 158 WARN(1, "bad panel fit mode: %d\n", fitting_mode); 159 return; 160 } 161 162 done: 163 pipe_config->pch_pfit.pos = (x << 16) | y; 164 pipe_config->pch_pfit.size = (width << 16) | height; 165 pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0; 166 } 167 168 static void 169 centre_horizontally(struct drm_display_mode *mode, 170 int width) 171 { 172 u32 border, sync_pos, blank_width, sync_width; 173 174 /* keep the hsync and hblank widths constant */ 175 sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start; 176 blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start; 177 sync_pos = (blank_width - sync_width + 1) / 2; 178 179 border = (mode->hdisplay - width + 1) / 2; 180 border += border & 1; /* make the border even */ 181 182 mode->crtc_hdisplay = width; 183 mode->crtc_hblank_start = width + border; 184 mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width; 185 186 mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos; 187 mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width; 188 } 189 190 static void 191 centre_vertically(struct drm_display_mode *mode, 192 int height) 193 { 194 u32 border, sync_pos, blank_width, sync_width; 195 196 /* keep the vsync and vblank widths constant */ 197 sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start; 198 blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start; 199 sync_pos = (blank_width - sync_width + 1) / 2; 200 201 border = (mode->vdisplay - height + 1) / 2; 202 203 mode->crtc_vdisplay = height; 204 mode->crtc_vblank_start = height + border; 205 mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width; 206 207 mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos; 208 mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width; 209 } 210 211 static inline u32 panel_fitter_scaling(u32 source, u32 target) 212 { 213 /* 214 * Floating point operation is not supported. So the FACTOR 215 * is defined, which can avoid the floating point computation 216 * when calculating the panel ratio. 217 */ 218 #define ACCURACY 12 219 #define FACTOR (1 << ACCURACY) 220 u32 ratio = source * FACTOR / target; 221 return (FACTOR * ratio + FACTOR/2) / FACTOR; 222 } 223 224 static void i965_scale_aspect(struct intel_crtc_config *pipe_config, 225 u32 *pfit_control) 226 { 227 struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode; 228 u32 scaled_width = adjusted_mode->hdisplay * 229 pipe_config->pipe_src_h; 230 u32 scaled_height = pipe_config->pipe_src_w * 231 adjusted_mode->vdisplay; 232 233 /* 965+ is easy, it does everything in hw */ 234 if (scaled_width > scaled_height) 235 *pfit_control |= PFIT_ENABLE | 236 PFIT_SCALING_PILLAR; 237 else if (scaled_width < scaled_height) 238 *pfit_control |= PFIT_ENABLE | 239 PFIT_SCALING_LETTER; 240 else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w) 241 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO; 242 } 243 244 static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config, 245 u32 *pfit_control, u32 *pfit_pgm_ratios, 246 u32 *border) 247 { 248 struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode; 249 u32 scaled_width = adjusted_mode->hdisplay * 250 pipe_config->pipe_src_h; 251 u32 scaled_height = pipe_config->pipe_src_w * 252 adjusted_mode->vdisplay; 253 u32 bits; 254 255 /* 256 * For earlier chips we have to calculate the scaling 257 * ratio by hand and program it into the 258 * PFIT_PGM_RATIO register 259 */ 260 if (scaled_width > scaled_height) { /* pillar */ 261 centre_horizontally(adjusted_mode, 262 scaled_height / 263 pipe_config->pipe_src_h); 264 265 *border = LVDS_BORDER_ENABLE; 266 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) { 267 bits = panel_fitter_scaling(pipe_config->pipe_src_h, 268 adjusted_mode->vdisplay); 269 270 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT | 271 bits << PFIT_VERT_SCALE_SHIFT); 272 *pfit_control |= (PFIT_ENABLE | 273 VERT_INTERP_BILINEAR | 274 HORIZ_INTERP_BILINEAR); 275 } 276 } else if (scaled_width < scaled_height) { /* letter */ 277 centre_vertically(adjusted_mode, 278 scaled_width / 279 pipe_config->pipe_src_w); 280 281 *border = LVDS_BORDER_ENABLE; 282 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) { 283 bits = panel_fitter_scaling(pipe_config->pipe_src_w, 284 adjusted_mode->hdisplay); 285 286 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT | 287 bits << PFIT_VERT_SCALE_SHIFT); 288 *pfit_control |= (PFIT_ENABLE | 289 VERT_INTERP_BILINEAR | 290 HORIZ_INTERP_BILINEAR); 291 } 292 } else { 293 /* Aspects match, Let hw scale both directions */ 294 *pfit_control |= (PFIT_ENABLE | 295 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE | 296 VERT_INTERP_BILINEAR | 297 HORIZ_INTERP_BILINEAR); 298 } 299 } 300 301 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc, 302 struct intel_crtc_config *pipe_config, 303 int fitting_mode) 304 { 305 struct drm_device *dev = intel_crtc->base.dev; 306 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0; 307 struct drm_display_mode *adjusted_mode; 308 309 adjusted_mode = &pipe_config->adjusted_mode; 310 311 /* Native modes don't need fitting */ 312 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w && 313 adjusted_mode->vdisplay == pipe_config->pipe_src_h) 314 goto out; 315 316 switch (fitting_mode) { 317 case DRM_MODE_SCALE_CENTER: 318 /* 319 * For centered modes, we have to calculate border widths & 320 * heights and modify the values programmed into the CRTC. 321 */ 322 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w); 323 centre_vertically(adjusted_mode, pipe_config->pipe_src_h); 324 border = LVDS_BORDER_ENABLE; 325 break; 326 case DRM_MODE_SCALE_ASPECT: 327 /* Scale but preserve the aspect ratio */ 328 if (INTEL_INFO(dev)->gen >= 4) 329 i965_scale_aspect(pipe_config, &pfit_control); 330 else 331 i9xx_scale_aspect(pipe_config, &pfit_control, 332 &pfit_pgm_ratios, &border); 333 break; 334 case DRM_MODE_SCALE_FULLSCREEN: 335 /* 336 * Full scaling, even if it changes the aspect ratio. 337 * Fortunately this is all done for us in hw. 338 */ 339 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay || 340 pipe_config->pipe_src_w != adjusted_mode->hdisplay) { 341 pfit_control |= PFIT_ENABLE; 342 if (INTEL_INFO(dev)->gen >= 4) 343 pfit_control |= PFIT_SCALING_AUTO; 344 else 345 pfit_control |= (VERT_AUTO_SCALE | 346 VERT_INTERP_BILINEAR | 347 HORIZ_AUTO_SCALE | 348 HORIZ_INTERP_BILINEAR); 349 } 350 break; 351 default: 352 WARN(1, "bad panel fit mode: %d\n", fitting_mode); 353 return; 354 } 355 356 /* 965+ wants fuzzy fitting */ 357 /* FIXME: handle multiple panels by failing gracefully */ 358 if (INTEL_INFO(dev)->gen >= 4) 359 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) | 360 PFIT_FILTER_FUZZY); 361 362 out: 363 if ((pfit_control & PFIT_ENABLE) == 0) { 364 pfit_control = 0; 365 pfit_pgm_ratios = 0; 366 } 367 368 /* Make sure pre-965 set dither correctly for 18bpp panels. */ 369 if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18) 370 pfit_control |= PANEL_8TO6_DITHER_ENABLE; 371 372 pipe_config->gmch_pfit.control = pfit_control; 373 pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios; 374 pipe_config->gmch_pfit.lvds_border_bits = border; 375 } 376 377 enum drm_connector_status 378 intel_panel_detect(struct drm_device *dev) 379 { 380 struct drm_i915_private *dev_priv = dev->dev_private; 381 382 /* Assume that the BIOS does not lie through the OpRegion... */ 383 if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) { 384 return ioread32(dev_priv->opregion.lid_state) & 0x1 ? 385 connector_status_connected : 386 connector_status_disconnected; 387 } 388 389 switch (i915.panel_ignore_lid) { 390 case -2: 391 return connector_status_connected; 392 case -1: 393 return connector_status_disconnected; 394 default: 395 return connector_status_unknown; 396 } 397 } 398 399 /** 400 * scale - scale values from one range to another 401 * 402 * @source_val: value in range [@source_min..@source_max] 403 * 404 * Return @source_val in range [@source_min..@source_max] scaled to range 405 * [@target_min..@target_max]. 406 */ 407 static uint32_t scale(uint32_t source_val, 408 uint32_t source_min, uint32_t source_max, 409 uint32_t target_min, uint32_t target_max) 410 { 411 uint64_t target_val; 412 413 WARN_ON(source_min > source_max); 414 WARN_ON(target_min > target_max); 415 416 /* defensive */ 417 source_val = clamp(source_val, source_min, source_max); 418 419 /* avoid overflows */ 420 target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) * 421 (target_max - target_min), source_max - source_min); 422 target_val += target_min; 423 424 return target_val; 425 } 426 427 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */ 428 static inline u32 scale_user_to_hw(struct intel_connector *connector, 429 u32 user_level, u32 user_max) 430 { 431 struct intel_panel *panel = &connector->panel; 432 433 return scale(user_level, 0, user_max, 434 panel->backlight.min, panel->backlight.max); 435 } 436 437 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result 438 * to [hw_min..hw_max]. */ 439 static inline u32 clamp_user_to_hw(struct intel_connector *connector, 440 u32 user_level, u32 user_max) 441 { 442 struct intel_panel *panel = &connector->panel; 443 u32 hw_level; 444 445 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max); 446 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max); 447 448 return hw_level; 449 } 450 451 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */ 452 static inline u32 scale_hw_to_user(struct intel_connector *connector, 453 u32 hw_level, u32 user_max) 454 { 455 struct intel_panel *panel = &connector->panel; 456 457 return scale(hw_level, panel->backlight.min, panel->backlight.max, 458 0, user_max); 459 } 460 461 static u32 intel_panel_compute_brightness(struct intel_connector *connector, 462 u32 val) 463 { 464 struct drm_device *dev = connector->base.dev; 465 struct drm_i915_private *dev_priv = dev->dev_private; 466 struct intel_panel *panel = &connector->panel; 467 468 WARN_ON(panel->backlight.max == 0); 469 470 if (i915.invert_brightness < 0) 471 return val; 472 473 if (i915.invert_brightness > 0 || 474 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) { 475 return panel->backlight.max - val; 476 } 477 478 return val; 479 } 480 481 static u32 bdw_get_backlight(struct intel_connector *connector) 482 { 483 struct drm_device *dev = connector->base.dev; 484 struct drm_i915_private *dev_priv = dev->dev_private; 485 486 return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK; 487 } 488 489 static u32 pch_get_backlight(struct intel_connector *connector) 490 { 491 struct drm_device *dev = connector->base.dev; 492 struct drm_i915_private *dev_priv = dev->dev_private; 493 494 return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 495 } 496 497 static u32 i9xx_get_backlight(struct intel_connector *connector) 498 { 499 struct drm_device *dev = connector->base.dev; 500 struct drm_i915_private *dev_priv = dev->dev_private; 501 struct intel_panel *panel = &connector->panel; 502 u32 val; 503 504 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 505 if (INTEL_INFO(dev)->gen < 4) 506 val >>= 1; 507 508 if (panel->backlight.combination_mode) { 509 u8 lbpc; 510 511 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc); 512 val *= lbpc; 513 } 514 515 return val; 516 } 517 518 static u32 _vlv_get_backlight(struct drm_device *dev, enum i915_pipe pipe) 519 { 520 struct drm_i915_private *dev_priv = dev->dev_private; 521 522 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK; 523 } 524 525 static u32 vlv_get_backlight(struct intel_connector *connector) 526 { 527 struct drm_device *dev = connector->base.dev; 528 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 529 530 return _vlv_get_backlight(dev, pipe); 531 } 532 533 #if 0 534 static u32 intel_panel_get_backlight(struct intel_connector *connector) 535 { 536 struct drm_device *dev = connector->base.dev; 537 struct drm_i915_private *dev_priv = dev->dev_private; 538 u32 val; 539 unsigned long flags; 540 541 spin_lock_irqsave(&dev_priv->backlight_lock, flags); 542 543 val = dev_priv->display.get_backlight(connector); 544 val = intel_panel_compute_brightness(connector, val); 545 546 spin_unlock_irqrestore(&dev_priv->backlight_lock, flags); 547 548 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); 549 return val; 550 } 551 #endif 552 553 static void bdw_set_backlight(struct intel_connector *connector, u32 level) 554 { 555 struct drm_device *dev = connector->base.dev; 556 struct drm_i915_private *dev_priv = dev->dev_private; 557 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK; 558 I915_WRITE(BLC_PWM_PCH_CTL2, val | level); 559 } 560 561 static void pch_set_backlight(struct intel_connector *connector, u32 level) 562 { 563 struct drm_device *dev = connector->base.dev; 564 struct drm_i915_private *dev_priv = dev->dev_private; 565 u32 tmp; 566 567 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 568 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level); 569 } 570 571 static void i9xx_set_backlight(struct intel_connector *connector, u32 level) 572 { 573 struct drm_device *dev = connector->base.dev; 574 struct drm_i915_private *dev_priv = dev->dev_private; 575 struct intel_panel *panel = &connector->panel; 576 u32 tmp, mask; 577 578 WARN_ON(panel->backlight.max == 0); 579 580 if (panel->backlight.combination_mode) { 581 u8 lbpc; 582 583 lbpc = level * 0xfe / panel->backlight.max + 1; 584 level /= lbpc; 585 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc); 586 } 587 588 if (IS_GEN4(dev)) { 589 mask = BACKLIGHT_DUTY_CYCLE_MASK; 590 } else { 591 level <<= 1; 592 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV; 593 } 594 595 tmp = I915_READ(BLC_PWM_CTL) & ~mask; 596 I915_WRITE(BLC_PWM_CTL, tmp | level); 597 } 598 599 static void vlv_set_backlight(struct intel_connector *connector, u32 level) 600 { 601 struct drm_device *dev = connector->base.dev; 602 struct drm_i915_private *dev_priv = dev->dev_private; 603 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 604 u32 tmp; 605 606 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK; 607 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level); 608 } 609 610 static void 611 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level) 612 { 613 struct drm_device *dev = connector->base.dev; 614 struct drm_i915_private *dev_priv = dev->dev_private; 615 616 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); 617 618 level = intel_panel_compute_brightness(connector, level); 619 dev_priv->display.set_backlight(connector, level); 620 } 621 622 /* set backlight brightness to level in range [0..max], scaling wrt hw min */ 623 static void intel_panel_set_backlight(struct intel_connector *connector, 624 u32 user_level, u32 user_max) 625 { 626 struct drm_device *dev = connector->base.dev; 627 struct drm_i915_private *dev_priv = dev->dev_private; 628 struct intel_panel *panel = &connector->panel; 629 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 630 u32 hw_level; 631 632 if (!panel->backlight.present || pipe == INVALID_PIPE) 633 return; 634 635 spin_lock(&dev_priv->backlight_lock); 636 637 WARN_ON(panel->backlight.max == 0); 638 639 hw_level = scale_user_to_hw(connector, user_level, user_max); 640 panel->backlight.level = hw_level; 641 642 if (panel->backlight.enabled) 643 intel_panel_actually_set_backlight(connector, hw_level); 644 645 spin_unlock(&dev_priv->backlight_lock); 646 } 647 648 /* set backlight brightness to level in range [0..max], assuming hw min is 649 * respected. 650 */ 651 void intel_panel_set_backlight_acpi(struct intel_connector *connector, 652 u32 user_level, u32 user_max) 653 { 654 struct drm_device *dev = connector->base.dev; 655 struct drm_i915_private *dev_priv = dev->dev_private; 656 struct intel_panel *panel = &connector->panel; 657 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 658 u32 hw_level; 659 660 if (!panel->backlight.present || pipe == INVALID_PIPE) 661 return; 662 663 spin_lock(&dev_priv->backlight_lock); 664 665 WARN_ON(panel->backlight.max == 0); 666 667 hw_level = clamp_user_to_hw(connector, user_level, user_max); 668 panel->backlight.level = hw_level; 669 670 if (panel->backlight.device) 671 panel->backlight.device->props.brightness = 672 scale_hw_to_user(connector, 673 panel->backlight.level, 674 panel->backlight.device->props.max_brightness); 675 676 if (panel->backlight.enabled) 677 intel_panel_actually_set_backlight(connector, hw_level); 678 679 spin_unlock(&dev_priv->backlight_lock); 680 } 681 682 static void pch_disable_backlight(struct intel_connector *connector) 683 { 684 struct drm_device *dev = connector->base.dev; 685 struct drm_i915_private *dev_priv = dev->dev_private; 686 u32 tmp; 687 688 intel_panel_actually_set_backlight(connector, 0); 689 690 tmp = I915_READ(BLC_PWM_CPU_CTL2); 691 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE); 692 693 tmp = I915_READ(BLC_PWM_PCH_CTL1); 694 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE); 695 } 696 697 static void i9xx_disable_backlight(struct intel_connector *connector) 698 { 699 intel_panel_actually_set_backlight(connector, 0); 700 } 701 702 static void i965_disable_backlight(struct intel_connector *connector) 703 { 704 struct drm_device *dev = connector->base.dev; 705 struct drm_i915_private *dev_priv = dev->dev_private; 706 u32 tmp; 707 708 intel_panel_actually_set_backlight(connector, 0); 709 710 tmp = I915_READ(BLC_PWM_CTL2); 711 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE); 712 } 713 714 static void vlv_disable_backlight(struct intel_connector *connector) 715 { 716 struct drm_device *dev = connector->base.dev; 717 struct drm_i915_private *dev_priv = dev->dev_private; 718 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 719 u32 tmp; 720 721 intel_panel_actually_set_backlight(connector, 0); 722 723 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe)); 724 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE); 725 } 726 727 void intel_panel_disable_backlight(struct intel_connector *connector) 728 { 729 struct drm_device *dev = connector->base.dev; 730 struct drm_i915_private *dev_priv = dev->dev_private; 731 struct intel_panel *panel = &connector->panel; 732 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 733 734 if (!panel->backlight.present || pipe == INVALID_PIPE) 735 return; 736 737 /* 738 * Do not disable backlight on the vgaswitcheroo path. When switching 739 * away from i915, the other client may depend on i915 to handle the 740 * backlight. This will leave the backlight on unnecessarily when 741 * another client is not activated. 742 */ 743 if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) { 744 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n"); 745 return; 746 } 747 748 spin_lock(&dev_priv->backlight_lock); 749 750 if (panel->backlight.device) 751 panel->backlight.device->props.power = FB_BLANK_POWERDOWN; 752 panel->backlight.enabled = false; 753 dev_priv->display.disable_backlight(connector); 754 755 spin_unlock(&dev_priv->backlight_lock); 756 } 757 758 static void bdw_enable_backlight(struct intel_connector *connector) 759 { 760 struct drm_device *dev = connector->base.dev; 761 struct drm_i915_private *dev_priv = dev->dev_private; 762 struct intel_panel *panel = &connector->panel; 763 u32 pch_ctl1, pch_ctl2; 764 765 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 766 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { 767 DRM_DEBUG_KMS("pch backlight already enabled\n"); 768 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; 769 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 770 } 771 772 pch_ctl2 = panel->backlight.max << 16; 773 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2); 774 775 pch_ctl1 = 0; 776 if (panel->backlight.active_low_pwm) 777 pch_ctl1 |= BLM_PCH_POLARITY; 778 779 /* BDW always uses the pch pwm controls. */ 780 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE; 781 782 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 783 POSTING_READ(BLC_PWM_PCH_CTL1); 784 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE); 785 786 /* This won't stick until the above enable. */ 787 intel_panel_actually_set_backlight(connector, panel->backlight.level); 788 } 789 790 static void pch_enable_backlight(struct intel_connector *connector) 791 { 792 struct drm_device *dev = connector->base.dev; 793 struct drm_i915_private *dev_priv = dev->dev_private; 794 struct intel_panel *panel = &connector->panel; 795 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 796 enum transcoder cpu_transcoder = 797 intel_pipe_to_cpu_transcoder(dev_priv, pipe); 798 u32 cpu_ctl2, pch_ctl1, pch_ctl2; 799 800 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2); 801 if (cpu_ctl2 & BLM_PWM_ENABLE) { 802 DRM_DEBUG_KMS("cpu backlight already enabled\n"); 803 cpu_ctl2 &= ~BLM_PWM_ENABLE; 804 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2); 805 } 806 807 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 808 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { 809 DRM_DEBUG_KMS("pch backlight already enabled\n"); 810 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; 811 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 812 } 813 814 if (cpu_transcoder == TRANSCODER_EDP) 815 cpu_ctl2 = BLM_TRANSCODER_EDP; 816 else 817 cpu_ctl2 = BLM_PIPE(cpu_transcoder); 818 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2); 819 POSTING_READ(BLC_PWM_CPU_CTL2); 820 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE); 821 822 /* This won't stick until the above enable. */ 823 intel_panel_actually_set_backlight(connector, panel->backlight.level); 824 825 pch_ctl2 = panel->backlight.max << 16; 826 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2); 827 828 pch_ctl1 = 0; 829 if (panel->backlight.active_low_pwm) 830 pch_ctl1 |= BLM_PCH_POLARITY; 831 832 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 833 POSTING_READ(BLC_PWM_PCH_CTL1); 834 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE); 835 } 836 837 static void i9xx_enable_backlight(struct intel_connector *connector) 838 { 839 struct drm_device *dev = connector->base.dev; 840 struct drm_i915_private *dev_priv = dev->dev_private; 841 struct intel_panel *panel = &connector->panel; 842 u32 ctl, freq; 843 844 ctl = I915_READ(BLC_PWM_CTL); 845 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) { 846 DRM_DEBUG_KMS("backlight already enabled\n"); 847 I915_WRITE(BLC_PWM_CTL, 0); 848 } 849 850 freq = panel->backlight.max; 851 if (panel->backlight.combination_mode) 852 freq /= 0xff; 853 854 ctl = freq << 17; 855 if (panel->backlight.combination_mode) 856 ctl |= BLM_LEGACY_MODE; 857 if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm) 858 ctl |= BLM_POLARITY_PNV; 859 860 I915_WRITE(BLC_PWM_CTL, ctl); 861 POSTING_READ(BLC_PWM_CTL); 862 863 /* XXX: combine this into above write? */ 864 intel_panel_actually_set_backlight(connector, panel->backlight.level); 865 } 866 867 static void i965_enable_backlight(struct intel_connector *connector) 868 { 869 struct drm_device *dev = connector->base.dev; 870 struct drm_i915_private *dev_priv = dev->dev_private; 871 struct intel_panel *panel = &connector->panel; 872 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 873 u32 ctl, ctl2, freq; 874 875 ctl2 = I915_READ(BLC_PWM_CTL2); 876 if (ctl2 & BLM_PWM_ENABLE) { 877 DRM_DEBUG_KMS("backlight already enabled\n"); 878 ctl2 &= ~BLM_PWM_ENABLE; 879 I915_WRITE(BLC_PWM_CTL2, ctl2); 880 } 881 882 freq = panel->backlight.max; 883 if (panel->backlight.combination_mode) 884 freq /= 0xff; 885 886 ctl = freq << 16; 887 I915_WRITE(BLC_PWM_CTL, ctl); 888 889 ctl2 = BLM_PIPE(pipe); 890 if (panel->backlight.combination_mode) 891 ctl2 |= BLM_COMBINATION_MODE; 892 if (panel->backlight.active_low_pwm) 893 ctl2 |= BLM_POLARITY_I965; 894 I915_WRITE(BLC_PWM_CTL2, ctl2); 895 POSTING_READ(BLC_PWM_CTL2); 896 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE); 897 898 intel_panel_actually_set_backlight(connector, panel->backlight.level); 899 } 900 901 static void vlv_enable_backlight(struct intel_connector *connector) 902 { 903 struct drm_device *dev = connector->base.dev; 904 struct drm_i915_private *dev_priv = dev->dev_private; 905 struct intel_panel *panel = &connector->panel; 906 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 907 u32 ctl, ctl2; 908 909 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe)); 910 if (ctl2 & BLM_PWM_ENABLE) { 911 DRM_DEBUG_KMS("backlight already enabled\n"); 912 ctl2 &= ~BLM_PWM_ENABLE; 913 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2); 914 } 915 916 ctl = panel->backlight.max << 16; 917 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl); 918 919 /* XXX: combine this into above write? */ 920 intel_panel_actually_set_backlight(connector, panel->backlight.level); 921 922 ctl2 = 0; 923 if (panel->backlight.active_low_pwm) 924 ctl2 |= BLM_POLARITY_I965; 925 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2); 926 POSTING_READ(VLV_BLC_PWM_CTL2(pipe)); 927 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE); 928 } 929 930 void intel_panel_enable_backlight(struct intel_connector *connector) 931 { 932 struct drm_device *dev = connector->base.dev; 933 struct drm_i915_private *dev_priv = dev->dev_private; 934 struct intel_panel *panel = &connector->panel; 935 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 936 937 if (!panel->backlight.present || pipe == INVALID_PIPE) 938 return; 939 940 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe)); 941 942 spin_lock(&dev_priv->backlight_lock); 943 944 WARN_ON(panel->backlight.max == 0); 945 946 if (panel->backlight.level == 0) { 947 panel->backlight.level = panel->backlight.max; 948 if (panel->backlight.device) 949 panel->backlight.device->props.brightness = 950 scale_hw_to_user(connector, 951 panel->backlight.level, 952 panel->backlight.device->props.max_brightness); 953 } 954 955 dev_priv->display.enable_backlight(connector); 956 panel->backlight.enabled = true; 957 if (panel->backlight.device) 958 panel->backlight.device->props.power = FB_BLANK_UNBLANK; 959 960 spin_unlock(&dev_priv->backlight_lock); 961 } 962 963 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) 964 static int intel_backlight_device_update_status(struct backlight_device *bd) 965 { 966 struct intel_connector *connector = bl_get_data(bd); 967 struct intel_panel *panel = &connector->panel; 968 struct drm_device *dev = connector->base.dev; 969 970 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 971 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n", 972 bd->props.brightness, bd->props.max_brightness); 973 intel_panel_set_backlight(connector, bd->props.brightness, 974 bd->props.max_brightness); 975 976 /* 977 * Allow flipping bl_power as a sub-state of enabled. Sadly the 978 * backlight class device does not make it easy to to differentiate 979 * between callbacks for brightness and bl_power, so our backlight_power 980 * callback needs to take this into account. 981 */ 982 if (panel->backlight.enabled) { 983 if (panel->backlight_power) { 984 bool enable = bd->props.power == FB_BLANK_UNBLANK && 985 bd->props.brightness != 0; 986 panel->backlight_power(connector, enable); 987 } 988 } else { 989 bd->props.power = FB_BLANK_POWERDOWN; 990 } 991 992 drm_modeset_unlock(&dev->mode_config.connection_mutex); 993 return 0; 994 } 995 996 static int intel_backlight_device_get_brightness(struct backlight_device *bd) 997 { 998 struct intel_connector *connector = bl_get_data(bd); 999 struct drm_device *dev = connector->base.dev; 1000 struct drm_i915_private *dev_priv = dev->dev_private; 1001 u32 hw_level; 1002 int ret; 1003 1004 intel_runtime_pm_get(dev_priv); 1005 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 1006 1007 hw_level = intel_panel_get_backlight(connector); 1008 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness); 1009 1010 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1011 intel_runtime_pm_put(dev_priv); 1012 1013 return ret; 1014 } 1015 1016 static const struct backlight_ops intel_backlight_device_ops = { 1017 .update_status = intel_backlight_device_update_status, 1018 .get_brightness = intel_backlight_device_get_brightness, 1019 }; 1020 1021 static int intel_backlight_device_register(struct intel_connector *connector) 1022 { 1023 struct intel_panel *panel = &connector->panel; 1024 struct backlight_properties props; 1025 1026 if (WARN_ON(panel->backlight.device)) 1027 return -ENODEV; 1028 1029 WARN_ON(panel->backlight.max == 0); 1030 1031 memset(&props, 0, sizeof(props)); 1032 props.type = BACKLIGHT_RAW; 1033 1034 /* 1035 * Note: Everything should work even if the backlight device max 1036 * presented to the userspace is arbitrarily chosen. 1037 */ 1038 props.max_brightness = panel->backlight.max; 1039 props.brightness = scale_hw_to_user(connector, 1040 panel->backlight.level, 1041 props.max_brightness); 1042 1043 if (panel->backlight.enabled) 1044 props.power = FB_BLANK_UNBLANK; 1045 else 1046 props.power = FB_BLANK_POWERDOWN; 1047 1048 /* 1049 * Note: using the same name independent of the connector prevents 1050 * registration of multiple backlight devices in the driver. 1051 */ 1052 panel->backlight.device = 1053 backlight_device_register("intel_backlight", 1054 connector->base.kdev, 1055 connector, 1056 &intel_backlight_device_ops, &props); 1057 1058 if (IS_ERR(panel->backlight.device)) { 1059 DRM_ERROR("Failed to register backlight: %ld\n", 1060 PTR_ERR(panel->backlight.device)); 1061 panel->backlight.device = NULL; 1062 return -ENODEV; 1063 } 1064 return 0; 1065 } 1066 1067 static void intel_backlight_device_unregister(struct intel_connector *connector) 1068 { 1069 struct intel_panel *panel = &connector->panel; 1070 1071 if (panel->backlight.device) { 1072 backlight_device_unregister(panel->backlight.device); 1073 panel->backlight.device = NULL; 1074 } 1075 } 1076 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */ 1077 static int intel_backlight_device_register(struct intel_connector *connector) 1078 { 1079 return 0; 1080 } 1081 static void intel_backlight_device_unregister(struct intel_connector *connector) 1082 { 1083 } 1084 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */ 1085 1086 /* 1087 * Note: The setup hooks can't assume pipe is set! 1088 * 1089 * XXX: Query mode clock or hardware clock and program PWM modulation frequency 1090 * appropriately when it's 0. Use VBT and/or sane defaults. 1091 */ 1092 static u32 get_backlight_min_vbt(struct intel_connector *connector) 1093 { 1094 struct drm_device *dev = connector->base.dev; 1095 struct drm_i915_private *dev_priv = dev->dev_private; 1096 struct intel_panel *panel = &connector->panel; 1097 int min; 1098 1099 WARN_ON(panel->backlight.max == 0); 1100 1101 /* 1102 * XXX: If the vbt value is 255, it makes min equal to max, which leads 1103 * to problems. There are such machines out there. Either our 1104 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard 1105 * against this by letting the minimum be at most (arbitrarily chosen) 1106 * 25% of the max. 1107 */ 1108 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64); 1109 if (min != dev_priv->vbt.backlight.min_brightness) { 1110 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n", 1111 dev_priv->vbt.backlight.min_brightness, min); 1112 } 1113 1114 /* vbt value is a coefficient in range [0..255] */ 1115 return scale(min, 0, 255, 0, panel->backlight.max); 1116 } 1117 1118 static int bdw_setup_backlight(struct intel_connector *connector) 1119 { 1120 struct drm_device *dev = connector->base.dev; 1121 struct drm_i915_private *dev_priv = dev->dev_private; 1122 struct intel_panel *panel = &connector->panel; 1123 u32 pch_ctl1, pch_ctl2, val; 1124 1125 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 1126 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY; 1127 1128 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2); 1129 panel->backlight.max = pch_ctl2 >> 16; 1130 if (!panel->backlight.max) 1131 return -ENODEV; 1132 1133 panel->backlight.min = get_backlight_min_vbt(connector); 1134 1135 val = bdw_get_backlight(connector); 1136 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1137 1138 panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) && 1139 panel->backlight.level != 0; 1140 1141 return 0; 1142 } 1143 1144 static int pch_setup_backlight(struct intel_connector *connector) 1145 { 1146 struct drm_device *dev = connector->base.dev; 1147 struct drm_i915_private *dev_priv = dev->dev_private; 1148 struct intel_panel *panel = &connector->panel; 1149 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val; 1150 1151 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 1152 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY; 1153 1154 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2); 1155 panel->backlight.max = pch_ctl2 >> 16; 1156 if (!panel->backlight.max) 1157 return -ENODEV; 1158 1159 panel->backlight.min = get_backlight_min_vbt(connector); 1160 1161 val = pch_get_backlight(connector); 1162 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1163 1164 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2); 1165 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) && 1166 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0; 1167 1168 return 0; 1169 } 1170 1171 static int i9xx_setup_backlight(struct intel_connector *connector) 1172 { 1173 struct drm_device *dev = connector->base.dev; 1174 struct drm_i915_private *dev_priv = dev->dev_private; 1175 struct intel_panel *panel = &connector->panel; 1176 u32 ctl, val; 1177 1178 ctl = I915_READ(BLC_PWM_CTL); 1179 1180 if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev)) 1181 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE; 1182 1183 if (IS_PINEVIEW(dev)) 1184 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV; 1185 1186 panel->backlight.max = ctl >> 17; 1187 if (panel->backlight.combination_mode) 1188 panel->backlight.max *= 0xff; 1189 1190 if (!panel->backlight.max) 1191 return -ENODEV; 1192 1193 panel->backlight.min = get_backlight_min_vbt(connector); 1194 1195 val = i9xx_get_backlight(connector); 1196 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1197 1198 panel->backlight.enabled = panel->backlight.level != 0; 1199 1200 return 0; 1201 } 1202 1203 static int i965_setup_backlight(struct intel_connector *connector) 1204 { 1205 struct drm_device *dev = connector->base.dev; 1206 struct drm_i915_private *dev_priv = dev->dev_private; 1207 struct intel_panel *panel = &connector->panel; 1208 u32 ctl, ctl2, val; 1209 1210 ctl2 = I915_READ(BLC_PWM_CTL2); 1211 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE; 1212 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965; 1213 1214 ctl = I915_READ(BLC_PWM_CTL); 1215 panel->backlight.max = ctl >> 16; 1216 if (panel->backlight.combination_mode) 1217 panel->backlight.max *= 0xff; 1218 1219 if (!panel->backlight.max) 1220 return -ENODEV; 1221 1222 panel->backlight.min = get_backlight_min_vbt(connector); 1223 1224 val = i9xx_get_backlight(connector); 1225 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1226 1227 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) && 1228 panel->backlight.level != 0; 1229 1230 return 0; 1231 } 1232 1233 static int vlv_setup_backlight(struct intel_connector *connector) 1234 { 1235 struct drm_device *dev = connector->base.dev; 1236 struct drm_i915_private *dev_priv = dev->dev_private; 1237 struct intel_panel *panel = &connector->panel; 1238 enum i915_pipe pipe; 1239 u32 ctl, ctl2, val; 1240 1241 for_each_pipe(dev_priv, pipe) { 1242 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe)); 1243 1244 /* Skip if the modulation freq is already set */ 1245 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK) 1246 continue; 1247 1248 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK; 1249 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) | 1250 cur_val); 1251 } 1252 1253 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A)); 1254 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965; 1255 1256 ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A)); 1257 panel->backlight.max = ctl >> 16; 1258 if (!panel->backlight.max) 1259 return -ENODEV; 1260 1261 panel->backlight.min = get_backlight_min_vbt(connector); 1262 1263 val = _vlv_get_backlight(dev, PIPE_A); 1264 panel->backlight.level = intel_panel_compute_brightness(connector, val); 1265 1266 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) && 1267 panel->backlight.level != 0; 1268 1269 return 0; 1270 } 1271 1272 #ifdef __DragonFly__ 1273 /* 1274 * Read max backlight level 1275 */ 1276 static int 1277 sysctl_backlight_max(SYSCTL_HANDLER_ARGS) 1278 { 1279 int err, val; 1280 struct intel_connector *connector = arg1; 1281 struct drm_device *dev = connector->base.dev; 1282 struct drm_i915_private *dev_priv = dev->dev_private; 1283 struct intel_panel *panel = &connector->panel; 1284 1285 spin_lock(&dev_priv->backlight_lock); 1286 val = panel->backlight.max; 1287 spin_unlock(&dev_priv->backlight_lock); 1288 1289 err = sysctl_handle_int(oidp, &val, 0, req); 1290 return(err); 1291 } 1292 1293 /* 1294 * Read/write backlight level 1295 */ 1296 static int 1297 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS) 1298 { 1299 struct intel_connector *connector = arg1; 1300 struct drm_device *dev = connector->base.dev; 1301 struct drm_i915_private *dev_priv = dev->dev_private; 1302 struct intel_panel *panel = &connector->panel; 1303 int err, val; 1304 u32 max_brightness; 1305 1306 val = panel->backlight.level; 1307 1308 spin_lock(&dev_priv->backlight_lock); 1309 max_brightness = panel->backlight.max; 1310 spin_unlock(&dev_priv->backlight_lock); 1311 1312 err = sysctl_handle_int(oidp, &val, 0, req); 1313 if (err != 0 || req->newptr == NULL) { 1314 return(err); 1315 } 1316 1317 if (val != panel->backlight.level && val >=0 && 1318 val <= max_brightness) { 1319 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 1320 intel_panel_set_backlight(arg1, val, max_brightness); 1321 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1322 } 1323 1324 return(err); 1325 } 1326 #endif /* __DragonFly__ */ 1327 1328 int intel_panel_setup_backlight(struct drm_connector *connector) 1329 { 1330 struct drm_device *dev = connector->dev; 1331 struct drm_i915_private *dev_priv = dev->dev_private; 1332 struct intel_connector *intel_connector = to_intel_connector(connector); 1333 struct intel_panel *panel = &intel_connector->panel; 1334 int ret; 1335 1336 if (!dev_priv->vbt.backlight.present) { 1337 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) { 1338 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n"); 1339 } else { 1340 DRM_DEBUG_KMS("no backlight present per VBT\n"); 1341 return 0; 1342 } 1343 } 1344 1345 /* set level and max in panel struct */ 1346 spin_lock(&dev_priv->backlight_lock); 1347 ret = dev_priv->display.setup_backlight(intel_connector); 1348 spin_unlock(&dev_priv->backlight_lock); 1349 1350 if (ret) { 1351 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n", 1352 connector->name); 1353 return ret; 1354 } 1355 1356 intel_backlight_device_register(intel_connector); 1357 1358 panel->backlight.present = true; 1359 1360 #ifdef __DragonFly__ 1361 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 1362 OID_AUTO, "backlight_max", 1363 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY, 1364 connector, sizeof(int), 1365 sysctl_backlight_max, 1366 "I", "Max backlight level"); 1367 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 1368 OID_AUTO, "backlight_level", 1369 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY, 1370 connector, sizeof(int), 1371 sysctl_backlight_handler, 1372 "I", "Backlight level"); 1373 #endif 1374 1375 DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, " 1376 "sysfs interface %sregistered\n", 1377 panel->backlight.enabled ? "enabled" : "disabled", 1378 panel->backlight.level, panel->backlight.max, 1379 panel->backlight.device ? "" : "not "); 1380 1381 return 0; 1382 } 1383 1384 void intel_panel_destroy_backlight(struct drm_connector *connector) 1385 { 1386 struct intel_connector *intel_connector = to_intel_connector(connector); 1387 struct intel_panel *panel = &intel_connector->panel; 1388 1389 panel->backlight.present = false; 1390 intel_backlight_device_unregister(intel_connector); 1391 } 1392 1393 /* Set up chip specific backlight functions */ 1394 void intel_panel_init_backlight_funcs(struct drm_device *dev) 1395 { 1396 struct drm_i915_private *dev_priv = dev->dev_private; 1397 1398 if (IS_BROADWELL(dev)) { 1399 dev_priv->display.setup_backlight = bdw_setup_backlight; 1400 dev_priv->display.enable_backlight = bdw_enable_backlight; 1401 dev_priv->display.disable_backlight = pch_disable_backlight; 1402 dev_priv->display.set_backlight = bdw_set_backlight; 1403 dev_priv->display.get_backlight = bdw_get_backlight; 1404 } else if (HAS_PCH_SPLIT(dev)) { 1405 dev_priv->display.setup_backlight = pch_setup_backlight; 1406 dev_priv->display.enable_backlight = pch_enable_backlight; 1407 dev_priv->display.disable_backlight = pch_disable_backlight; 1408 dev_priv->display.set_backlight = pch_set_backlight; 1409 dev_priv->display.get_backlight = pch_get_backlight; 1410 } else if (IS_VALLEYVIEW(dev)) { 1411 dev_priv->display.setup_backlight = vlv_setup_backlight; 1412 dev_priv->display.enable_backlight = vlv_enable_backlight; 1413 dev_priv->display.disable_backlight = vlv_disable_backlight; 1414 dev_priv->display.set_backlight = vlv_set_backlight; 1415 dev_priv->display.get_backlight = vlv_get_backlight; 1416 } else if (IS_GEN4(dev)) { 1417 dev_priv->display.setup_backlight = i965_setup_backlight; 1418 dev_priv->display.enable_backlight = i965_enable_backlight; 1419 dev_priv->display.disable_backlight = i965_disable_backlight; 1420 dev_priv->display.set_backlight = i9xx_set_backlight; 1421 dev_priv->display.get_backlight = i9xx_get_backlight; 1422 } else { 1423 dev_priv->display.setup_backlight = i9xx_setup_backlight; 1424 dev_priv->display.enable_backlight = i9xx_enable_backlight; 1425 dev_priv->display.disable_backlight = i9xx_disable_backlight; 1426 dev_priv->display.set_backlight = i9xx_set_backlight; 1427 dev_priv->display.get_backlight = i9xx_get_backlight; 1428 } 1429 } 1430 1431 int intel_panel_init(struct intel_panel *panel, 1432 struct drm_display_mode *fixed_mode, 1433 struct drm_display_mode *downclock_mode) 1434 { 1435 panel->fixed_mode = fixed_mode; 1436 panel->downclock_mode = downclock_mode; 1437 1438 return 0; 1439 } 1440 1441 void intel_panel_fini(struct intel_panel *panel) 1442 { 1443 struct intel_connector *intel_connector = 1444 container_of(panel, struct intel_connector, panel); 1445 1446 if (panel->fixed_mode) 1447 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 1448 1449 if (panel->downclock_mode) 1450 drm_mode_destroy(intel_connector->base.dev, 1451 panel->downclock_mode); 1452 } 1453