1 /* 2 * Copyright © 2006-2010 Intel Corporation 3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie> 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: 25 * Eric Anholt <eric@anholt.net> 26 * Dave Airlie <airlied@linux.ie> 27 * Jesse Barnes <jesse.barnes@intel.com> 28 * Chris Wilson <chris@chris-wilson.co.uk> 29 */ 30 31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 32 33 #include <linux/moduleparam.h> 34 #include "intel_drv.h" 35 36 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */ 37 38 void 39 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode, 40 struct drm_display_mode *adjusted_mode) 41 { 42 adjusted_mode->hdisplay = fixed_mode->hdisplay; 43 adjusted_mode->hsync_start = fixed_mode->hsync_start; 44 adjusted_mode->hsync_end = fixed_mode->hsync_end; 45 adjusted_mode->htotal = fixed_mode->htotal; 46 47 adjusted_mode->vdisplay = fixed_mode->vdisplay; 48 adjusted_mode->vsync_start = fixed_mode->vsync_start; 49 adjusted_mode->vsync_end = fixed_mode->vsync_end; 50 adjusted_mode->vtotal = fixed_mode->vtotal; 51 52 adjusted_mode->clock = fixed_mode->clock; 53 } 54 55 /* adjusted_mode has been preset to be the panel's fixed mode */ 56 void 57 intel_pch_panel_fitting(struct drm_device *dev, 58 int fitting_mode, 59 const struct drm_display_mode *mode, 60 struct drm_display_mode *adjusted_mode) 61 { 62 struct drm_i915_private *dev_priv = dev->dev_private; 63 int x, y, width, height; 64 65 x = y = width = height = 0; 66 67 /* Native modes don't need fitting */ 68 if (adjusted_mode->hdisplay == mode->hdisplay && 69 adjusted_mode->vdisplay == mode->vdisplay) 70 goto done; 71 72 switch (fitting_mode) { 73 case DRM_MODE_SCALE_CENTER: 74 width = mode->hdisplay; 75 height = mode->vdisplay; 76 x = (adjusted_mode->hdisplay - width + 1)/2; 77 y = (adjusted_mode->vdisplay - height + 1)/2; 78 break; 79 80 case DRM_MODE_SCALE_ASPECT: 81 /* Scale but preserve the aspect ratio */ 82 { 83 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay; 84 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay; 85 if (scaled_width > scaled_height) { /* pillar */ 86 width = scaled_height / mode->vdisplay; 87 if (width & 1) 88 width++; 89 x = (adjusted_mode->hdisplay - width + 1) / 2; 90 y = 0; 91 height = adjusted_mode->vdisplay; 92 } else if (scaled_width < scaled_height) { /* letter */ 93 height = scaled_width / mode->hdisplay; 94 if (height & 1) 95 height++; 96 y = (adjusted_mode->vdisplay - height + 1) / 2; 97 x = 0; 98 width = adjusted_mode->hdisplay; 99 } else { 100 x = y = 0; 101 width = adjusted_mode->hdisplay; 102 height = adjusted_mode->vdisplay; 103 } 104 } 105 break; 106 107 default: 108 case DRM_MODE_SCALE_FULLSCREEN: 109 x = y = 0; 110 width = adjusted_mode->hdisplay; 111 height = adjusted_mode->vdisplay; 112 break; 113 } 114 115 done: 116 dev_priv->pch_pf_pos = (x << 16) | y; 117 dev_priv->pch_pf_size = (width << 16) | height; 118 } 119 120 static int is_backlight_combination_mode(struct drm_device *dev) 121 { 122 struct drm_i915_private *dev_priv = dev->dev_private; 123 124 if (INTEL_INFO(dev)->gen >= 4) 125 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE; 126 127 if (IS_GEN2(dev)) 128 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE; 129 130 return 0; 131 } 132 133 static u32 i915_read_blc_pwm_ctl(struct drm_device *dev) 134 { 135 struct drm_i915_private *dev_priv = dev->dev_private; 136 u32 val; 137 138 /* Restore the CTL value if it lost, e.g. GPU reset */ 139 140 if (HAS_PCH_SPLIT(dev_priv->dev)) { 141 val = I915_READ(BLC_PWM_PCH_CTL2); 142 if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) { 143 dev_priv->regfile.saveBLC_PWM_CTL2 = val; 144 } else if (val == 0) { 145 val = dev_priv->regfile.saveBLC_PWM_CTL2; 146 I915_WRITE(BLC_PWM_PCH_CTL2, val); 147 } 148 } else { 149 val = I915_READ(BLC_PWM_CTL); 150 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) { 151 dev_priv->regfile.saveBLC_PWM_CTL = val; 152 if (INTEL_INFO(dev)->gen >= 4) 153 dev_priv->regfile.saveBLC_PWM_CTL2 = 154 I915_READ(BLC_PWM_CTL2); 155 } else if (val == 0) { 156 val = dev_priv->regfile.saveBLC_PWM_CTL; 157 I915_WRITE(BLC_PWM_CTL, val); 158 if (INTEL_INFO(dev)->gen >= 4) 159 I915_WRITE(BLC_PWM_CTL2, 160 dev_priv->regfile.saveBLC_PWM_CTL2); 161 } 162 } 163 164 return val; 165 } 166 167 static u32 _intel_panel_get_max_backlight(struct drm_device *dev) 168 { 169 u32 max; 170 171 max = i915_read_blc_pwm_ctl(dev); 172 173 if (HAS_PCH_SPLIT(dev)) { 174 max >>= 16; 175 } else { 176 if (INTEL_INFO(dev)->gen < 4) 177 max >>= 17; 178 else 179 max >>= 16; 180 181 if (is_backlight_combination_mode(dev)) 182 max *= 0xff; 183 } 184 185 return max; 186 } 187 188 u32 intel_panel_get_max_backlight(struct drm_device *dev) 189 { 190 u32 max; 191 192 max = _intel_panel_get_max_backlight(dev); 193 if (max == 0) { 194 /* XXX add code here to query mode clock or hardware clock 195 * and program max PWM appropriately. 196 */ 197 #if 0 198 pr_warn_once("fixme: max PWM is zero\n"); 199 #endif 200 return 1; 201 } 202 203 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max); 204 return max; 205 } 206 207 static int i915_panel_invert_brightness; 208 TUNABLE_INT("drm.i915.panel_invert_brightness", &i915_panel_invert_brightness); 209 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness " 210 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 211 "report PCI device ID, subsystem vendor and subsystem device ID " 212 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 213 "It will then be included in an upcoming module version."); 214 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600); 215 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val) 216 { 217 struct drm_i915_private *dev_priv = dev->dev_private; 218 219 if (i915_panel_invert_brightness < 0) 220 return val; 221 222 if (i915_panel_invert_brightness > 0 || 223 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) 224 return intel_panel_get_max_backlight(dev) - val; 225 226 return val; 227 } 228 229 static u32 intel_panel_get_backlight(struct drm_device *dev) 230 { 231 struct drm_i915_private *dev_priv = dev->dev_private; 232 u32 val; 233 234 if (HAS_PCH_SPLIT(dev)) { 235 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 236 } else { 237 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 238 if (INTEL_INFO(dev)->gen < 4) 239 val >>= 1; 240 241 if (is_backlight_combination_mode(dev)) { 242 u8 lbpc; 243 244 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc); 245 val *= lbpc; 246 } 247 } 248 249 val = intel_panel_compute_brightness(dev, val); 250 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); 251 return val; 252 } 253 254 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level) 255 { 256 struct drm_i915_private *dev_priv = dev->dev_private; 257 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 258 I915_WRITE(BLC_PWM_CPU_CTL, val | level); 259 } 260 261 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level) 262 { 263 struct drm_i915_private *dev_priv = dev->dev_private; 264 u32 tmp; 265 266 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); 267 level = intel_panel_compute_brightness(dev, level); 268 269 if (HAS_PCH_SPLIT(dev)) 270 return intel_pch_panel_set_backlight(dev, level); 271 272 if (is_backlight_combination_mode(dev)) { 273 u32 max = intel_panel_get_max_backlight(dev); 274 u8 lbpc; 275 276 lbpc = level * 0xfe / max + 1; 277 level /= lbpc; 278 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc); 279 } 280 281 tmp = I915_READ(BLC_PWM_CTL); 282 if (INTEL_INFO(dev)->gen < 4) 283 level <<= 1; 284 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK; 285 I915_WRITE(BLC_PWM_CTL, tmp | level); 286 } 287 288 void intel_panel_set_backlight(struct drm_device *dev, u32 level) 289 { 290 struct drm_i915_private *dev_priv = dev->dev_private; 291 292 dev_priv->backlight.level = level; 293 if (dev_priv->backlight.device) 294 dev_priv->backlight.device->props.brightness = level; 295 296 if (dev_priv->backlight.enabled) 297 intel_panel_actually_set_backlight(dev, level); 298 } 299 300 void intel_panel_disable_backlight(struct drm_device *dev) 301 { 302 struct drm_i915_private *dev_priv = dev->dev_private; 303 304 dev_priv->backlight.enabled = false; 305 intel_panel_actually_set_backlight(dev, 0); 306 307 if (INTEL_INFO(dev)->gen >= 4) { 308 uint32_t reg, tmp; 309 310 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 311 312 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); 313 314 if (HAS_PCH_SPLIT(dev)) { 315 tmp = I915_READ(BLC_PWM_PCH_CTL1); 316 tmp &= ~BLM_PCH_PWM_ENABLE; 317 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 318 } 319 } 320 } 321 322 void intel_panel_enable_backlight(struct drm_device *dev, 323 enum i915_pipe pipe) 324 { 325 struct drm_i915_private *dev_priv = dev->dev_private; 326 327 if (dev_priv->backlight.level == 0) { 328 dev_priv->backlight.level = intel_panel_get_max_backlight(dev); 329 if (dev_priv->backlight.device) 330 dev_priv->backlight.device->props.brightness = 331 dev_priv->backlight.level; 332 } 333 334 if (INTEL_INFO(dev)->gen >= 4) { 335 uint32_t reg, tmp; 336 337 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 338 339 340 tmp = I915_READ(reg); 341 342 /* Note that this can also get called through dpms changes. And 343 * we don't track the backlight dpms state, hence check whether 344 * we have to do anything first. */ 345 if (tmp & BLM_PWM_ENABLE) 346 goto set_level; 347 348 if (INTEL_INFO(dev)->num_pipes == 3) 349 tmp &= ~BLM_PIPE_SELECT_IVB; 350 else 351 tmp &= ~BLM_PIPE_SELECT; 352 353 tmp |= BLM_PIPE(pipe); 354 tmp &= ~BLM_PWM_ENABLE; 355 356 I915_WRITE(reg, tmp); 357 POSTING_READ(reg); 358 I915_WRITE(reg, tmp | BLM_PWM_ENABLE); 359 360 if (HAS_PCH_SPLIT(dev)) { 361 tmp = I915_READ(BLC_PWM_PCH_CTL1); 362 tmp |= BLM_PCH_PWM_ENABLE; 363 tmp &= ~BLM_PCH_OVERRIDE_ENABLE; 364 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 365 } 366 } 367 368 set_level: 369 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1. 370 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these 371 * registers are set. 372 */ 373 dev_priv->backlight.enabled = true; 374 intel_panel_actually_set_backlight(dev, dev_priv->backlight.level); 375 } 376 377 static void intel_panel_init_backlight(struct drm_device *dev) 378 { 379 struct drm_i915_private *dev_priv = dev->dev_private; 380 381 dev_priv->backlight.level = intel_panel_get_backlight(dev); 382 dev_priv->backlight.enabled = dev_priv->backlight.level != 0; 383 } 384 385 enum drm_connector_status 386 intel_panel_detect(struct drm_device *dev) 387 { 388 struct drm_i915_private *dev_priv = dev->dev_private; 389 390 /* Assume that the BIOS does not lie through the OpRegion... */ 391 if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) { 392 return ioread32(dev_priv->opregion.lid_state) & 0x1 ? 393 connector_status_connected : 394 connector_status_disconnected; 395 } 396 397 switch (i915_panel_ignore_lid) { 398 case -2: 399 return connector_status_connected; 400 case -1: 401 return connector_status_disconnected; 402 default: 403 return connector_status_unknown; 404 } 405 } 406 407 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 408 static int intel_panel_update_status(struct backlight_device *bd) 409 { 410 struct drm_device *dev = bl_get_data(bd); 411 intel_panel_set_backlight(dev, bd->props.brightness); 412 return 0; 413 } 414 415 static int intel_panel_get_brightness(struct backlight_device *bd) 416 { 417 struct drm_device *dev = bl_get_data(bd); 418 return intel_panel_get_backlight(dev); 419 } 420 421 static const struct backlight_ops intel_panel_bl_ops = { 422 .update_status = intel_panel_update_status, 423 .get_brightness = intel_panel_get_brightness, 424 }; 425 426 int intel_panel_setup_backlight(struct drm_connector *connector) 427 { 428 struct drm_device *dev = connector->dev; 429 struct drm_i915_private *dev_priv = dev->dev_private; 430 struct backlight_properties props; 431 432 intel_panel_init_backlight(dev); 433 434 if (WARN_ON(dev_priv->backlight.device)) 435 return -ENODEV; 436 437 memset(&props, 0, sizeof(props)); 438 props.type = BACKLIGHT_RAW; 439 props.brightness = dev_priv->backlight.level; 440 props.max_brightness = _intel_panel_get_max_backlight(dev); 441 if (props.max_brightness == 0) { 442 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n"); 443 return -ENODEV; 444 } 445 dev_priv->backlight.device = 446 backlight_device_register("intel_backlight", 447 &connector->kdev, dev, 448 &intel_panel_bl_ops, &props); 449 450 if (IS_ERR(dev_priv->backlight.device)) { 451 DRM_ERROR("Failed to register backlight: %ld\n", 452 PTR_ERR(dev_priv->backlight.device)); 453 dev_priv->backlight.device = NULL; 454 return -ENODEV; 455 } 456 return 0; 457 } 458 459 void intel_panel_destroy_backlight(struct drm_device *dev) 460 { 461 struct drm_i915_private *dev_priv = dev->dev_private; 462 if (dev_priv->backlight.device) { 463 backlight_device_unregister(dev_priv->backlight.device); 464 dev_priv->backlight.device = NULL; 465 } 466 } 467 #else 468 469 /* 470 * Read max backlight level 471 */ 472 static int 473 sysctl_backlight_max(SYSCTL_HANDLER_ARGS) 474 { 475 int err, val; 476 477 val = intel_panel_get_max_backlight((struct drm_device *)arg1); 478 err = sysctl_handle_int(oidp, &val, 0, req); 479 return(err); 480 } 481 482 /* 483 * Read/write backlight level 484 */ 485 static int 486 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS) 487 { 488 struct drm_i915_private *dev_priv; 489 int err, val; 490 491 dev_priv = ((struct drm_device *)arg1)->dev_private; 492 val = dev_priv->backlight.level; 493 494 err = sysctl_handle_int(oidp, &val, 0, req); 495 if (err != 0 || req->newptr == NULL) { 496 return(err); 497 } 498 499 if (val != dev_priv->backlight.level && val >=0 && 500 val <= intel_panel_get_max_backlight((struct drm_device *)arg1)) { 501 intel_panel_set_backlight(arg1, val); 502 } 503 504 return(err); 505 } 506 507 int intel_panel_setup_backlight(struct drm_connector *connector) 508 { 509 intel_panel_init_backlight(connector->dev); 510 511 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 512 OID_AUTO, "backlight_max", 513 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY, 514 connector->dev, sizeof(int), 515 sysctl_backlight_max, 516 "I", "Max backlight level"); 517 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 518 OID_AUTO, "backlight_level", 519 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY, 520 connector->dev, sizeof(int), 521 sysctl_backlight_handler, 522 "I", "Backlight level"); 523 return 0; 524 } 525 526 void intel_panel_destroy_backlight(struct drm_device *dev) 527 { 528 return; 529 } 530 #endif 531 532 int intel_panel_init(struct intel_panel *panel, 533 struct drm_display_mode *fixed_mode) 534 { 535 panel->fixed_mode = fixed_mode; 536 537 return 0; 538 } 539 540 void intel_panel_fini(struct intel_panel *panel) 541 { 542 struct intel_connector *intel_connector = 543 container_of(panel, struct intel_connector, panel); 544 545 if (panel->fixed_mode) 546 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 547 } 548