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_enabled) 294 intel_panel_actually_set_backlight(dev, level); 295 } 296 297 void intel_panel_disable_backlight(struct drm_device *dev) 298 { 299 struct drm_i915_private *dev_priv = dev->dev_private; 300 301 dev_priv->backlight_enabled = false; 302 intel_panel_actually_set_backlight(dev, 0); 303 304 if (INTEL_INFO(dev)->gen >= 4) { 305 uint32_t reg, tmp; 306 307 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 308 309 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); 310 311 if (HAS_PCH_SPLIT(dev)) { 312 tmp = I915_READ(BLC_PWM_PCH_CTL1); 313 tmp &= ~BLM_PCH_PWM_ENABLE; 314 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 315 } 316 } 317 } 318 319 void intel_panel_enable_backlight(struct drm_device *dev, 320 enum i915_pipe pipe) 321 { 322 struct drm_i915_private *dev_priv = dev->dev_private; 323 324 if (dev_priv->backlight_level == 0) 325 dev_priv->backlight_level = intel_panel_get_max_backlight(dev); 326 327 if (INTEL_INFO(dev)->gen >= 4) { 328 uint32_t reg, tmp; 329 330 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 331 332 333 tmp = I915_READ(reg); 334 335 /* Note that this can also get called through dpms changes. And 336 * we don't track the backlight dpms state, hence check whether 337 * we have to do anything first. */ 338 if (tmp & BLM_PWM_ENABLE) 339 goto set_level; 340 341 if (dev_priv->num_pipe == 3) 342 tmp &= ~BLM_PIPE_SELECT_IVB; 343 else 344 tmp &= ~BLM_PIPE_SELECT; 345 346 tmp |= BLM_PIPE(pipe); 347 tmp &= ~BLM_PWM_ENABLE; 348 349 I915_WRITE(reg, tmp); 350 POSTING_READ(reg); 351 I915_WRITE(reg, tmp | BLM_PWM_ENABLE); 352 353 if (HAS_PCH_SPLIT(dev)) { 354 tmp = I915_READ(BLC_PWM_PCH_CTL1); 355 tmp |= BLM_PCH_PWM_ENABLE; 356 tmp &= ~BLM_PCH_OVERRIDE_ENABLE; 357 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 358 } 359 } 360 361 set_level: 362 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1. 363 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these 364 * registers are set. 365 */ 366 dev_priv->backlight_enabled = true; 367 intel_panel_actually_set_backlight(dev, dev_priv->backlight_level); 368 } 369 370 static void intel_panel_init_backlight(struct drm_device *dev) 371 { 372 struct drm_i915_private *dev_priv = dev->dev_private; 373 374 dev_priv->backlight_level = intel_panel_get_backlight(dev); 375 dev_priv->backlight_enabled = dev_priv->backlight_level != 0; 376 } 377 378 enum drm_connector_status 379 intel_panel_detect(struct drm_device *dev) 380 { 381 struct drm_i915_private *dev_priv = dev->dev_private; 382 383 /* Assume that the BIOS does not lie through the OpRegion... */ 384 if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) { 385 return ioread32(dev_priv->opregion.lid_state) & 0x1 ? 386 connector_status_connected : 387 connector_status_disconnected; 388 } 389 390 switch (i915_panel_ignore_lid) { 391 case -2: 392 return connector_status_connected; 393 case -1: 394 return connector_status_disconnected; 395 default: 396 return connector_status_unknown; 397 } 398 } 399 400 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 401 static int intel_panel_update_status(struct backlight_device *bd) 402 { 403 struct drm_device *dev = bl_get_data(bd); 404 intel_panel_set_backlight(dev, bd->props.brightness); 405 return 0; 406 } 407 408 static int intel_panel_get_brightness(struct backlight_device *bd) 409 { 410 struct drm_device *dev = bl_get_data(bd); 411 struct drm_i915_private *dev_priv = dev->dev_private; 412 return dev_priv->backlight_level; 413 } 414 415 static const struct backlight_ops intel_panel_bl_ops = { 416 .update_status = intel_panel_update_status, 417 .get_brightness = intel_panel_get_brightness, 418 }; 419 420 int intel_panel_setup_backlight(struct drm_connector *connector) 421 { 422 struct drm_device *dev = connector->dev; 423 struct drm_i915_private *dev_priv = dev->dev_private; 424 struct backlight_properties props; 425 426 intel_panel_init_backlight(dev); 427 428 if (WARN_ON(dev_priv->backlight)) 429 return -ENODEV; 430 431 memset(&props, 0, sizeof(props)); 432 props.type = BACKLIGHT_RAW; 433 props.max_brightness = _intel_panel_get_max_backlight(dev); 434 if (props.max_brightness == 0) { 435 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n"); 436 return -ENODEV; 437 } 438 dev_priv->backlight = 439 backlight_device_register("intel_backlight", 440 &connector->kdev, dev, 441 &intel_panel_bl_ops, &props); 442 443 if (IS_ERR(dev_priv->backlight)) { 444 DRM_ERROR("Failed to register backlight: %ld\n", 445 PTR_ERR(dev_priv->backlight)); 446 dev_priv->backlight = NULL; 447 return -ENODEV; 448 } 449 dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev); 450 return 0; 451 } 452 453 void intel_panel_destroy_backlight(struct drm_device *dev) 454 { 455 struct drm_i915_private *dev_priv = dev->dev_private; 456 if (dev_priv->backlight) { 457 backlight_device_unregister(dev_priv->backlight); 458 dev_priv->backlight = NULL; 459 } 460 } 461 #else 462 463 /* 464 * Read max backlight level 465 */ 466 static int 467 sysctl_backlight_max(SYSCTL_HANDLER_ARGS) 468 { 469 int err, val; 470 471 val = intel_panel_get_max_backlight((struct drm_device *)arg1); 472 err = sysctl_handle_int(oidp, &val, 0, req); 473 return(err); 474 } 475 476 /* 477 * Read/write backlight level 478 */ 479 static int 480 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS) 481 { 482 struct drm_i915_private *dev_priv; 483 int err, val; 484 485 dev_priv = ((struct drm_device *)arg1)->dev_private; 486 val = dev_priv->backlight_level; 487 488 err = sysctl_handle_int(oidp, &val, 0, req); 489 if (err != 0 || req->newptr == NULL) { 490 return(err); 491 } 492 493 if (val != dev_priv->backlight_level && val >=0 && 494 val <= intel_panel_get_max_backlight((struct drm_device *)arg1)) { 495 intel_panel_set_backlight(arg1, val); 496 } 497 498 return(err); 499 } 500 501 int intel_panel_setup_backlight(struct drm_connector *connector) 502 { 503 intel_panel_init_backlight(connector->dev); 504 505 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 506 OID_AUTO, "backlight_max", 507 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY, 508 connector->dev, sizeof(int), 509 sysctl_backlight_max, 510 "I", "Max backlight level"); 511 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children, 512 OID_AUTO, "backlight_level", 513 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY, 514 connector->dev, sizeof(int), 515 sysctl_backlight_handler, 516 "I", "Backlight level"); 517 return 0; 518 } 519 520 void intel_panel_destroy_backlight(struct drm_device *dev) 521 { 522 return; 523 } 524 525 #endif 526 527 int intel_panel_init(struct intel_panel *panel, 528 struct drm_display_mode *fixed_mode) 529 { 530 panel->fixed_mode = fixed_mode; 531 532 return 0; 533 } 534 535 void intel_panel_fini(struct intel_panel *panel) 536 { 537 struct intel_connector *intel_connector = 538 container_of(panel, struct intel_connector, panel); 539 540 if (panel->fixed_mode) 541 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 542 } 543