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_state *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->base.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_state *pipe_config, 225 u32 *pfit_control) 226 { 227 struct drm_display_mode *adjusted_mode = &pipe_config->base.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_state *pipe_config, 245 u32 *pfit_control, u32 *pfit_pgm_ratios, 246 u32 *border) 247 { 248 struct drm_display_mode *adjusted_mode = &pipe_config->base.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_state *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->base.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 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 523 return 0; 524 525 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK; 526 } 527 528 static u32 vlv_get_backlight(struct intel_connector *connector) 529 { 530 struct drm_device *dev = connector->base.dev; 531 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 532 533 return _vlv_get_backlight(dev, pipe); 534 } 535 536 #if 0 537 static u32 intel_panel_get_backlight(struct intel_connector *connector) 538 { 539 struct drm_device *dev = connector->base.dev; 540 struct drm_i915_private *dev_priv = dev->dev_private; 541 struct intel_panel *panel = &connector->panel; 542 u32 val = 0; 543 544 mutex_lock(&dev_priv->backlight_lock); 545 546 if (panel->backlight.enabled) { 547 val = dev_priv->display.get_backlight(connector); 548 val = intel_panel_compute_brightness(connector, val); 549 } 550 551 mutex_unlock(&dev_priv->backlight_lock); 552 553 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); 554 return val; 555 } 556 #endif 557 558 static void bdw_set_backlight(struct intel_connector *connector, u32 level) 559 { 560 struct drm_device *dev = connector->base.dev; 561 struct drm_i915_private *dev_priv = dev->dev_private; 562 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK; 563 I915_WRITE(BLC_PWM_PCH_CTL2, val | level); 564 } 565 566 static void pch_set_backlight(struct intel_connector *connector, u32 level) 567 { 568 struct drm_device *dev = connector->base.dev; 569 struct drm_i915_private *dev_priv = dev->dev_private; 570 u32 tmp; 571 572 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 573 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level); 574 } 575 576 static void i9xx_set_backlight(struct intel_connector *connector, u32 level) 577 { 578 struct drm_device *dev = connector->base.dev; 579 struct drm_i915_private *dev_priv = dev->dev_private; 580 struct intel_panel *panel = &connector->panel; 581 u32 tmp, mask; 582 583 WARN_ON(panel->backlight.max == 0); 584 585 if (panel->backlight.combination_mode) { 586 u8 lbpc; 587 588 lbpc = level * 0xfe / panel->backlight.max + 1; 589 level /= lbpc; 590 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc); 591 } 592 593 if (IS_GEN4(dev)) { 594 mask = BACKLIGHT_DUTY_CYCLE_MASK; 595 } else { 596 level <<= 1; 597 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV; 598 } 599 600 tmp = I915_READ(BLC_PWM_CTL) & ~mask; 601 I915_WRITE(BLC_PWM_CTL, tmp | level); 602 } 603 604 static void vlv_set_backlight(struct intel_connector *connector, u32 level) 605 { 606 struct drm_device *dev = connector->base.dev; 607 struct drm_i915_private *dev_priv = dev->dev_private; 608 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 609 u32 tmp; 610 611 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 612 return; 613 614 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK; 615 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level); 616 } 617 618 static void 619 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level) 620 { 621 struct drm_device *dev = connector->base.dev; 622 struct drm_i915_private *dev_priv = dev->dev_private; 623 624 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); 625 626 level = intel_panel_compute_brightness(connector, level); 627 dev_priv->display.set_backlight(connector, level); 628 } 629 630 /* set backlight brightness to level in range [0..max], scaling wrt hw min */ 631 static void intel_panel_set_backlight(struct intel_connector *connector, 632 u32 user_level, u32 user_max) 633 { 634 struct drm_device *dev = connector->base.dev; 635 struct drm_i915_private *dev_priv = dev->dev_private; 636 struct intel_panel *panel = &connector->panel; 637 u32 hw_level; 638 639 if (!panel->backlight.present) 640 return; 641 642 mutex_lock(&dev_priv->backlight_lock); 643 644 WARN_ON(panel->backlight.max == 0); 645 646 hw_level = scale_user_to_hw(connector, user_level, user_max); 647 panel->backlight.level = hw_level; 648 649 if (panel->backlight.enabled) 650 intel_panel_actually_set_backlight(connector, hw_level); 651 652 mutex_unlock(&dev_priv->backlight_lock); 653 } 654 655 /* set backlight brightness to level in range [0..max], assuming hw min is 656 * respected. 657 */ 658 void intel_panel_set_backlight_acpi(struct intel_connector *connector, 659 u32 user_level, u32 user_max) 660 { 661 struct drm_device *dev = connector->base.dev; 662 struct drm_i915_private *dev_priv = dev->dev_private; 663 struct intel_panel *panel = &connector->panel; 664 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 665 u32 hw_level; 666 667 /* 668 * INVALID_PIPE may occur during driver init because 669 * connection_mutex isn't held across the entire backlight 670 * setup + modeset readout, and the BIOS can issue the 671 * requests at any time. 672 */ 673 if (!panel->backlight.present || pipe == INVALID_PIPE) 674 return; 675 676 mutex_lock(&dev_priv->backlight_lock); 677 678 WARN_ON(panel->backlight.max == 0); 679 680 hw_level = clamp_user_to_hw(connector, user_level, user_max); 681 panel->backlight.level = hw_level; 682 683 if (panel->backlight.device) 684 panel->backlight.device->props.brightness = 685 scale_hw_to_user(connector, 686 panel->backlight.level, 687 panel->backlight.device->props.max_brightness); 688 689 if (panel->backlight.enabled) 690 intel_panel_actually_set_backlight(connector, hw_level); 691 692 mutex_unlock(&dev_priv->backlight_lock); 693 } 694 695 static void pch_disable_backlight(struct intel_connector *connector) 696 { 697 struct drm_device *dev = connector->base.dev; 698 struct drm_i915_private *dev_priv = dev->dev_private; 699 u32 tmp; 700 701 intel_panel_actually_set_backlight(connector, 0); 702 703 tmp = I915_READ(BLC_PWM_CPU_CTL2); 704 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE); 705 706 tmp = I915_READ(BLC_PWM_PCH_CTL1); 707 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE); 708 } 709 710 static void i9xx_disable_backlight(struct intel_connector *connector) 711 { 712 intel_panel_actually_set_backlight(connector, 0); 713 } 714 715 static void i965_disable_backlight(struct intel_connector *connector) 716 { 717 struct drm_device *dev = connector->base.dev; 718 struct drm_i915_private *dev_priv = dev->dev_private; 719 u32 tmp; 720 721 intel_panel_actually_set_backlight(connector, 0); 722 723 tmp = I915_READ(BLC_PWM_CTL2); 724 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE); 725 } 726 727 static void vlv_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 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 732 u32 tmp; 733 734 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 735 return; 736 737 intel_panel_actually_set_backlight(connector, 0); 738 739 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe)); 740 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE); 741 } 742 743 void intel_panel_disable_backlight(struct intel_connector *connector) 744 { 745 struct drm_device *dev = connector->base.dev; 746 struct drm_i915_private *dev_priv = dev->dev_private; 747 struct intel_panel *panel = &connector->panel; 748 749 if (!panel->backlight.present) 750 return; 751 752 /* 753 * Do not disable backlight on the vgaswitcheroo path. When switching 754 * away from i915, the other client may depend on i915 to handle the 755 * backlight. This will leave the backlight on unnecessarily when 756 * another client is not activated. 757 */ 758 if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) { 759 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n"); 760 return; 761 } 762 763 mutex_lock(&dev_priv->backlight_lock); 764 765 if (panel->backlight.device) 766 panel->backlight.device->props.power = FB_BLANK_POWERDOWN; 767 panel->backlight.enabled = false; 768 dev_priv->display.disable_backlight(connector); 769 770 mutex_unlock(&dev_priv->backlight_lock); 771 } 772 773 static void bdw_enable_backlight(struct intel_connector *connector) 774 { 775 struct drm_device *dev = connector->base.dev; 776 struct drm_i915_private *dev_priv = dev->dev_private; 777 struct intel_panel *panel = &connector->panel; 778 u32 pch_ctl1, pch_ctl2; 779 780 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 781 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { 782 DRM_DEBUG_KMS("pch backlight already enabled\n"); 783 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; 784 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 785 } 786 787 pch_ctl2 = panel->backlight.max << 16; 788 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2); 789 790 pch_ctl1 = 0; 791 if (panel->backlight.active_low_pwm) 792 pch_ctl1 |= BLM_PCH_POLARITY; 793 794 /* After LPT, override is the default. */ 795 if (HAS_PCH_LPT(dev_priv)) 796 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE; 797 798 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 799 POSTING_READ(BLC_PWM_PCH_CTL1); 800 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE); 801 802 /* This won't stick until the above enable. */ 803 intel_panel_actually_set_backlight(connector, panel->backlight.level); 804 } 805 806 static void pch_enable_backlight(struct intel_connector *connector) 807 { 808 struct drm_device *dev = connector->base.dev; 809 struct drm_i915_private *dev_priv = dev->dev_private; 810 struct intel_panel *panel = &connector->panel; 811 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 812 enum transcoder cpu_transcoder = 813 intel_pipe_to_cpu_transcoder(dev_priv, pipe); 814 u32 cpu_ctl2, pch_ctl1, pch_ctl2; 815 816 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2); 817 if (cpu_ctl2 & BLM_PWM_ENABLE) { 818 DRM_DEBUG_KMS("cpu backlight already enabled\n"); 819 cpu_ctl2 &= ~BLM_PWM_ENABLE; 820 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2); 821 } 822 823 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1); 824 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { 825 DRM_DEBUG_KMS("pch backlight already enabled\n"); 826 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; 827 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 828 } 829 830 if (cpu_transcoder == TRANSCODER_EDP) 831 cpu_ctl2 = BLM_TRANSCODER_EDP; 832 else 833 cpu_ctl2 = BLM_PIPE(cpu_transcoder); 834 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2); 835 POSTING_READ(BLC_PWM_CPU_CTL2); 836 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE); 837 838 /* This won't stick until the above enable. */ 839 intel_panel_actually_set_backlight(connector, panel->backlight.level); 840 841 pch_ctl2 = panel->backlight.max << 16; 842 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2); 843 844 pch_ctl1 = 0; 845 if (panel->backlight.active_low_pwm) 846 pch_ctl1 |= BLM_PCH_POLARITY; 847 848 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1); 849 POSTING_READ(BLC_PWM_PCH_CTL1); 850 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE); 851 } 852 853 static void i9xx_enable_backlight(struct intel_connector *connector) 854 { 855 struct drm_device *dev = connector->base.dev; 856 struct drm_i915_private *dev_priv = dev->dev_private; 857 struct intel_panel *panel = &connector->panel; 858 u32 ctl, freq; 859 860 ctl = I915_READ(BLC_PWM_CTL); 861 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) { 862 DRM_DEBUG_KMS("backlight already enabled\n"); 863 I915_WRITE(BLC_PWM_CTL, 0); 864 } 865 866 freq = panel->backlight.max; 867 if (panel->backlight.combination_mode) 868 freq /= 0xff; 869 870 ctl = freq << 17; 871 if (panel->backlight.combination_mode) 872 ctl |= BLM_LEGACY_MODE; 873 if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm) 874 ctl |= BLM_POLARITY_PNV; 875 876 I915_WRITE(BLC_PWM_CTL, ctl); 877 POSTING_READ(BLC_PWM_CTL); 878 879 /* XXX: combine this into above write? */ 880 intel_panel_actually_set_backlight(connector, panel->backlight.level); 881 } 882 883 static void i965_enable_backlight(struct intel_connector *connector) 884 { 885 struct drm_device *dev = connector->base.dev; 886 struct drm_i915_private *dev_priv = dev->dev_private; 887 struct intel_panel *panel = &connector->panel; 888 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 889 u32 ctl, ctl2, freq; 890 891 ctl2 = I915_READ(BLC_PWM_CTL2); 892 if (ctl2 & BLM_PWM_ENABLE) { 893 DRM_DEBUG_KMS("backlight already enabled\n"); 894 ctl2 &= ~BLM_PWM_ENABLE; 895 I915_WRITE(BLC_PWM_CTL2, ctl2); 896 } 897 898 freq = panel->backlight.max; 899 if (panel->backlight.combination_mode) 900 freq /= 0xff; 901 902 ctl = freq << 16; 903 I915_WRITE(BLC_PWM_CTL, ctl); 904 905 ctl2 = BLM_PIPE(pipe); 906 if (panel->backlight.combination_mode) 907 ctl2 |= BLM_COMBINATION_MODE; 908 if (panel->backlight.active_low_pwm) 909 ctl2 |= BLM_POLARITY_I965; 910 I915_WRITE(BLC_PWM_CTL2, ctl2); 911 POSTING_READ(BLC_PWM_CTL2); 912 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE); 913 914 intel_panel_actually_set_backlight(connector, panel->backlight.level); 915 } 916 917 static void vlv_enable_backlight(struct intel_connector *connector) 918 { 919 struct drm_device *dev = connector->base.dev; 920 struct drm_i915_private *dev_priv = dev->dev_private; 921 struct intel_panel *panel = &connector->panel; 922 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 923 u32 ctl, ctl2; 924 925 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) 926 return; 927 928 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe)); 929 if (ctl2 & BLM_PWM_ENABLE) { 930 DRM_DEBUG_KMS("backlight already enabled\n"); 931 ctl2 &= ~BLM_PWM_ENABLE; 932 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2); 933 } 934 935 ctl = panel->backlight.max << 16; 936 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl); 937 938 /* XXX: combine this into above write? */ 939 intel_panel_actually_set_backlight(connector, panel->backlight.level); 940 941 ctl2 = 0; 942 if (panel->backlight.active_low_pwm) 943 ctl2 |= BLM_POLARITY_I965; 944 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2); 945 POSTING_READ(VLV_BLC_PWM_CTL2(pipe)); 946 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE); 947 } 948 949 void intel_panel_enable_backlight(struct intel_connector *connector) 950 { 951 struct drm_device *dev = connector->base.dev; 952 struct drm_i915_private *dev_priv = dev->dev_private; 953 struct intel_panel *panel = &connector->panel; 954 enum i915_pipe pipe = intel_get_pipe_from_connector(connector); 955 956 if (!panel->backlight.present) 957 return; 958 959 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe)); 960 961 mutex_lock(&dev_priv->backlight_lock); 962 963 WARN_ON(panel->backlight.max == 0); 964 965 if (panel->backlight.level <= panel->backlight.min) { 966 panel->backlight.level = panel->backlight.max; 967 if (panel->backlight.device) 968 panel->backlight.device->props.brightness = 969 scale_hw_to_user(connector, 970 panel->backlight.level, 971 panel->backlight.device->props.max_brightness); 972 } 973 974 dev_priv->display.enable_backlight(connector); 975 panel->backlight.enabled = true; 976 if (panel->backlight.device) 977 panel->backlight.device->props.power = FB_BLANK_UNBLANK; 978 979 mutex_unlock(&dev_priv->backlight_lock); 980 } 981 982 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) 983 static int intel_backlight_device_update_status(struct backlight_device *bd) 984 { 985 #if 0 986 struct intel_connector *connector = bl_get_data(bd); 987 struct intel_panel *panel = &connector->panel; 988 struct drm_device *dev = connector->base.dev; 989 990 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 991 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n", 992 bd->props.brightness, bd->props.max_brightness); 993 intel_panel_set_backlight(connector, bd->props.brightness, 994 bd->props.max_brightness); 995 996 /* 997 * Allow flipping bl_power as a sub-state of enabled. Sadly the 998 * backlight class device does not make it easy to to differentiate 999 * between callbacks for brightness and bl_power, so our backlight_power 1000 * callback needs to take this into account. 1001 */ 1002 if (panel->backlight.enabled) { 1003 if (panel->backlight_power) { 1004 bool enable = bd->props.power == FB_BLANK_UNBLANK && 1005 bd->props.brightness != 0; 1006 panel->backlight_power(connector, enable); 1007 } 1008 } else { 1009 bd->props.power = FB_BLANK_POWERDOWN; 1010 } 1011 1012 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1013 #endif 1014 return 0; 1015 } 1016 1017 static int intel_backlight_device_get_brightness(struct backlight_device *bd) 1018 { 1019 #if 0 1020 struct intel_connector *connector = bl_get_data(bd); 1021 struct drm_device *dev = connector->base.dev; 1022 struct drm_i915_private *dev_priv = dev->dev_private; 1023 u32 hw_level; 1024 int ret; 1025 1026 intel_runtime_pm_get(dev_priv); 1027 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 1028 1029 hw_level = intel_panel_get_backlight(connector); 1030 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness); 1031 1032 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1033 intel_runtime_pm_put(dev_priv); 1034 1035 return ret; 1036 #endif 1037 return 0; 1038 } 1039 1040 static const struct backlight_ops intel_backlight_device_ops = { 1041 .update_status = intel_backlight_device_update_status, 1042 .get_brightness = intel_backlight_device_get_brightness, 1043 }; 1044 1045 static int intel_backlight_device_register(struct intel_connector *connector) 1046 { 1047 struct intel_panel *panel = &connector->panel; 1048 struct backlight_properties props; 1049 1050 if (WARN_ON(panel->backlight.device)) 1051 return -ENODEV; 1052 1053 if (!panel->backlight.present) 1054 return 0; 1055 1056 WARN_ON(panel->backlight.max == 0); 1057 1058 memset(&props, 0, sizeof(props)); 1059 props.type = BACKLIGHT_RAW; 1060 1061 /* 1062 * Note: Everything should work even if the backlight device max 1063 * presented to the userspace is arbitrarily chosen. 1064 */ 1065 props.max_brightness = panel->backlight.max; 1066 props.brightness = scale_hw_to_user(connector, 1067 panel->backlight.level, 1068 props.max_brightness); 1069 1070 if (panel->backlight.enabled) 1071 props.power = FB_BLANK_UNBLANK; 1072 else 1073 props.power = FB_BLANK_POWERDOWN; 1074 1075 /* 1076 * Note: using the same name independent of the connector prevents 1077 * registration of multiple backlight devices in the driver. 1078 */ 1079 #if 0 1080 panel->backlight.device = 1081 backlight_device_register("intel_backlight", 1082 connector->base.kdev, 1083 connector, 1084 &intel_backlight_device_ops, &props); 1085 1086 if (IS_ERR(panel->backlight.device)) { 1087 DRM_ERROR("Failed to register backlight: %ld\n", 1088 PTR_ERR(panel->backlight.device)); 1089 panel->backlight.device = NULL; 1090 return -ENODEV; 1091 } 1092 #endif 1093 1094 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n", 1095 connector->base.name); 1096 1097 return 0; 1098 } 1099 1100 static void intel_backlight_device_unregister(struct intel_connector *connector) 1101 { 1102 #if 0 1103 struct intel_panel *panel = &connector->panel; 1104 1105 if (panel->backlight.device) { 1106 backlight_device_unregister(panel->backlight.device); 1107 panel->backlight.device = NULL; 1108 } 1109 #endif 1110 } 1111 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */ 1112 static int intel_backlight_device_register(struct intel_connector *connector) 1113 { 1114 return 0; 1115 } 1116 static 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 */ 1127 static 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 1153 static int bdw_setup_backlight(struct intel_connector *connector, enum i915_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 1179 static int pch_setup_backlight(struct intel_connector *connector, enum i915_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 1206 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_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 1238 static int i965_setup_backlight(struct intel_connector *connector, enum i915_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 1268 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_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 i915_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 1310 #ifdef __DragonFly__ 1311 /* 1312 * Read max backlight level 1313 */ 1314 static int 1315 sysctl_backlight_max(SYSCTL_HANDLER_ARGS) 1316 { 1317 int err, val; 1318 struct intel_connector *connector = arg1; 1319 struct drm_device *dev = connector->base.dev; 1320 struct drm_i915_private *dev_priv = dev->dev_private; 1321 struct intel_panel *panel = &connector->panel; 1322 1323 mutex_lock(&dev_priv->backlight_lock); 1324 val = panel->backlight.max; 1325 mutex_unlock(&dev_priv->backlight_lock); 1326 1327 err = sysctl_handle_int(oidp, &val, 0, req); 1328 return(err); 1329 } 1330 1331 /* 1332 * Read/write backlight level 1333 */ 1334 static int 1335 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS) 1336 { 1337 struct intel_connector *connector = arg1; 1338 struct drm_device *dev = connector->base.dev; 1339 struct drm_i915_private *dev_priv = dev->dev_private; 1340 struct intel_panel *panel = &connector->panel; 1341 int err, val; 1342 u32 user_level, max_brightness; 1343 1344 mutex_lock(&dev_priv->backlight_lock); 1345 max_brightness = panel->backlight.max; 1346 user_level = scale_hw_to_user(connector, panel->backlight.level, 1347 max_brightness); 1348 mutex_unlock(&dev_priv->backlight_lock); 1349 1350 val = user_level; 1351 err = sysctl_handle_int(oidp, &val, 0, req); 1352 if (err != 0 || req->newptr == NULL) { 1353 return(err); 1354 } 1355 1356 if (val != user_level && val >= 0 && val <= max_brightness) { 1357 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 1358 intel_panel_set_backlight(arg1, val, max_brightness); 1359 drm_modeset_unlock(&dev->mode_config.connection_mutex); 1360 } 1361 1362 return(err); 1363 } 1364 #endif /* __DragonFly__ */ 1365 1366 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe) 1367 { 1368 struct drm_device *dev = connector->dev; 1369 struct drm_i915_private *dev_priv = dev->dev_private; 1370 struct intel_connector *intel_connector = to_intel_connector(connector); 1371 struct intel_panel *panel = &intel_connector->panel; 1372 int ret; 1373 1374 if (!dev_priv->vbt.backlight.present) { 1375 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) { 1376 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n"); 1377 } else { 1378 DRM_DEBUG_KMS("no backlight present per VBT\n"); 1379 return 0; 1380 } 1381 } 1382 1383 /* set level and max in panel struct */ 1384 mutex_lock(&dev_priv->backlight_lock); 1385 ret = dev_priv->display.setup_backlight(intel_connector, pipe); 1386 mutex_unlock(&dev_priv->backlight_lock); 1387 1388 if (ret) { 1389 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n", 1390 connector->name); 1391 return ret; 1392 } 1393 1394 panel->backlight.present = true; 1395 1396 #ifdef __DragonFly__ 1397 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 1398 OID_AUTO, "backlight_max", 1399 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY, 1400 connector, sizeof(int), 1401 sysctl_backlight_max, 1402 "I", "Max backlight level"); 1403 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 1404 OID_AUTO, "backlight_level", 1405 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY, 1406 connector, sizeof(int), 1407 sysctl_backlight_handler, 1408 "I", "Backlight level"); 1409 #endif 1410 1411 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n", 1412 connector->name, 1413 panel->backlight.enabled ? "enabled" : "disabled", 1414 panel->backlight.level, panel->backlight.max); 1415 1416 return 0; 1417 } 1418 1419 void intel_panel_destroy_backlight(struct drm_connector *connector) 1420 { 1421 struct intel_connector *intel_connector = to_intel_connector(connector); 1422 struct intel_panel *panel = &intel_connector->panel; 1423 1424 panel->backlight.present = false; 1425 } 1426 1427 /* Set up chip specific backlight functions */ 1428 void intel_panel_init_backlight_funcs(struct drm_device *dev) 1429 { 1430 struct drm_i915_private *dev_priv = dev->dev_private; 1431 1432 if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) { 1433 dev_priv->display.setup_backlight = bdw_setup_backlight; 1434 dev_priv->display.enable_backlight = bdw_enable_backlight; 1435 dev_priv->display.disable_backlight = pch_disable_backlight; 1436 dev_priv->display.set_backlight = bdw_set_backlight; 1437 dev_priv->display.get_backlight = bdw_get_backlight; 1438 } else if (HAS_PCH_SPLIT(dev)) { 1439 dev_priv->display.setup_backlight = pch_setup_backlight; 1440 dev_priv->display.enable_backlight = pch_enable_backlight; 1441 dev_priv->display.disable_backlight = pch_disable_backlight; 1442 dev_priv->display.set_backlight = pch_set_backlight; 1443 dev_priv->display.get_backlight = pch_get_backlight; 1444 } else if (IS_VALLEYVIEW(dev)) { 1445 dev_priv->display.setup_backlight = vlv_setup_backlight; 1446 dev_priv->display.enable_backlight = vlv_enable_backlight; 1447 dev_priv->display.disable_backlight = vlv_disable_backlight; 1448 dev_priv->display.set_backlight = vlv_set_backlight; 1449 dev_priv->display.get_backlight = vlv_get_backlight; 1450 } else if (IS_GEN4(dev)) { 1451 dev_priv->display.setup_backlight = i965_setup_backlight; 1452 dev_priv->display.enable_backlight = i965_enable_backlight; 1453 dev_priv->display.disable_backlight = i965_disable_backlight; 1454 dev_priv->display.set_backlight = i9xx_set_backlight; 1455 dev_priv->display.get_backlight = i9xx_get_backlight; 1456 } else { 1457 dev_priv->display.setup_backlight = i9xx_setup_backlight; 1458 dev_priv->display.enable_backlight = i9xx_enable_backlight; 1459 dev_priv->display.disable_backlight = i9xx_disable_backlight; 1460 dev_priv->display.set_backlight = i9xx_set_backlight; 1461 dev_priv->display.get_backlight = i9xx_get_backlight; 1462 } 1463 } 1464 1465 int intel_panel_init(struct intel_panel *panel, 1466 struct drm_display_mode *fixed_mode, 1467 struct drm_display_mode *downclock_mode) 1468 { 1469 panel->fixed_mode = fixed_mode; 1470 panel->downclock_mode = downclock_mode; 1471 1472 return 0; 1473 } 1474 1475 void intel_panel_fini(struct intel_panel *panel) 1476 { 1477 struct intel_connector *intel_connector = 1478 container_of(panel, struct intel_connector, panel); 1479 1480 if (panel->fixed_mode) 1481 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 1482 1483 if (panel->downclock_mode) 1484 drm_mode_destroy(intel_connector->base.dev, 1485 panel->downclock_mode); 1486 } 1487 1488 void intel_backlight_register(struct drm_device *dev) 1489 { 1490 struct intel_connector *connector; 1491 1492 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head) 1493 intel_backlight_device_register(connector); 1494 } 1495 1496 void intel_backlight_unregister(struct drm_device *dev) 1497 { 1498 struct intel_connector *connector; 1499 1500 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head) 1501 intel_backlight_device_unregister(connector); 1502 } 1503