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 <drm/drmP.h> 32 #include <drm/i915_drm.h> 33 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 #if 0 210 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness " 211 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 212 "report PCI device ID, subsystem vendor and subsystem device ID " 213 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 214 "It will then be included in an upcoming module version."); 215 #endif 216 217 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val) 218 { 219 struct drm_i915_private *dev_priv = dev->dev_private; 220 221 if (i915_panel_invert_brightness < 0) 222 return val; 223 224 if (i915_panel_invert_brightness > 0 || 225 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) 226 return intel_panel_get_max_backlight(dev) - val; 227 228 return val; 229 } 230 231 static u32 intel_panel_get_backlight(struct drm_device *dev) 232 { 233 struct drm_i915_private *dev_priv = dev->dev_private; 234 u32 val; 235 236 if (HAS_PCH_SPLIT(dev)) { 237 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 238 } else { 239 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 240 if (INTEL_INFO(dev)->gen < 4) 241 val >>= 1; 242 243 if (is_backlight_combination_mode(dev)) { 244 u8 lbpc; 245 246 lbpc = pci_read_config(dev->dev, PCI_LBPC, 1); 247 val *= lbpc; 248 } 249 } 250 251 val = intel_panel_compute_brightness(dev, val); 252 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); 253 return val; 254 } 255 256 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level) 257 { 258 struct drm_i915_private *dev_priv = dev->dev_private; 259 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 260 I915_WRITE(BLC_PWM_CPU_CTL, val | level); 261 } 262 263 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level) 264 { 265 struct drm_i915_private *dev_priv = dev->dev_private; 266 u32 tmp; 267 268 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); 269 level = intel_panel_compute_brightness(dev, level); 270 271 if (HAS_PCH_SPLIT(dev)) 272 return intel_pch_panel_set_backlight(dev, level); 273 274 if (is_backlight_combination_mode(dev)) { 275 u32 max = intel_panel_get_max_backlight(dev); 276 u8 lbpc; 277 278 lbpc = level * 0xfe / max + 1; 279 level /= lbpc; 280 pci_write_config(dev->dev, PCI_LBPC, lbpc, 4); 281 } 282 283 tmp = I915_READ(BLC_PWM_CTL); 284 if (INTEL_INFO(dev)->gen < 4) 285 level <<= 1; 286 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK; 287 I915_WRITE(BLC_PWM_CTL, tmp | level); 288 } 289 290 void intel_panel_set_backlight(struct drm_device *dev, u32 level) 291 { 292 struct drm_i915_private *dev_priv = dev->dev_private; 293 294 dev_priv->backlight_level = level; 295 if (dev_priv->backlight_enabled) 296 intel_panel_actually_set_backlight(dev, level); 297 } 298 299 void intel_panel_disable_backlight(struct drm_device *dev) 300 { 301 struct drm_i915_private *dev_priv = dev->dev_private; 302 303 dev_priv->backlight_enabled = false; 304 intel_panel_actually_set_backlight(dev, 0); 305 306 if (INTEL_INFO(dev)->gen >= 4) { 307 uint32_t reg, tmp; 308 309 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 310 311 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); 312 313 if (HAS_PCH_SPLIT(dev)) { 314 tmp = I915_READ(BLC_PWM_PCH_CTL1); 315 tmp &= ~BLM_PCH_PWM_ENABLE; 316 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 317 } 318 } 319 } 320 321 void intel_panel_enable_backlight(struct drm_device *dev, 322 enum i915_pipe pipe) 323 { 324 struct drm_i915_private *dev_priv = dev->dev_private; 325 326 if (dev_priv->backlight_level == 0) 327 dev_priv->backlight_level = intel_panel_get_max_backlight(dev); 328 329 if (INTEL_INFO(dev)->gen >= 4) { 330 uint32_t reg, tmp; 331 332 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 333 334 335 tmp = I915_READ(reg); 336 337 /* Note that this can also get called through dpms changes. And 338 * we don't track the backlight dpms state, hence check whether 339 * we have to do anything first. */ 340 if (tmp & BLM_PWM_ENABLE) 341 goto set_level; 342 343 if (dev_priv->num_pipe == 3) 344 tmp &= ~BLM_PIPE_SELECT_IVB; 345 else 346 tmp &= ~BLM_PIPE_SELECT; 347 348 tmp |= BLM_PIPE(pipe); 349 tmp &= ~BLM_PWM_ENABLE; 350 351 I915_WRITE(reg, tmp); 352 POSTING_READ(reg); 353 I915_WRITE(reg, tmp | BLM_PWM_ENABLE); 354 355 if (HAS_PCH_SPLIT(dev)) { 356 tmp = I915_READ(BLC_PWM_PCH_CTL1); 357 tmp |= BLM_PCH_PWM_ENABLE; 358 tmp &= ~BLM_PCH_OVERRIDE_ENABLE; 359 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 360 } 361 } 362 363 set_level: 364 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1. 365 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these 366 * registers are set. 367 */ 368 dev_priv->backlight_enabled = true; 369 intel_panel_actually_set_backlight(dev, dev_priv->backlight_level); 370 } 371 372 static void intel_panel_init_backlight(struct drm_device *dev) 373 { 374 struct drm_i915_private *dev_priv = dev->dev_private; 375 376 dev_priv->backlight_level = intel_panel_get_backlight(dev); 377 dev_priv->backlight_enabled = dev_priv->backlight_level != 0; 378 } 379 380 enum drm_connector_status 381 intel_panel_detect(struct drm_device *dev) 382 { 383 struct drm_i915_private *dev_priv = dev->dev_private; 384 385 /* Assume that the BIOS does not lie through the OpRegion... */ 386 if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) { 387 return ioread32(dev_priv->opregion.lid_state) & 0x1 ? 388 connector_status_connected : 389 connector_status_disconnected; 390 } 391 392 switch (i915_panel_ignore_lid) { 393 case -2: 394 return connector_status_connected; 395 case -1: 396 return connector_status_disconnected; 397 default: 398 return connector_status_unknown; 399 } 400 } 401 402 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 403 static int intel_panel_update_status(struct backlight_device *bd) 404 { 405 struct drm_device *dev = bl_get_data(bd); 406 intel_panel_set_backlight(dev, bd->props.brightness); 407 return 0; 408 } 409 410 static int intel_panel_get_brightness(struct backlight_device *bd) 411 { 412 struct drm_device *dev = bl_get_data(bd); 413 struct drm_i915_private *dev_priv = dev->dev_private; 414 return dev_priv->backlight_level; 415 } 416 417 static const struct backlight_ops intel_panel_bl_ops = { 418 .update_status = intel_panel_update_status, 419 .get_brightness = intel_panel_get_brightness, 420 }; 421 422 int intel_panel_setup_backlight(struct drm_connector *connector) 423 { 424 struct drm_device *dev = connector->dev; 425 struct drm_i915_private *dev_priv = dev->dev_private; 426 struct backlight_properties props; 427 428 intel_panel_init_backlight(dev); 429 430 if (WARN_ON(dev_priv->backlight)) 431 return -ENODEV; 432 433 memset(&props, 0, sizeof(props)); 434 props.type = BACKLIGHT_RAW; 435 props.max_brightness = _intel_panel_get_max_backlight(dev); 436 if (props.max_brightness == 0) { 437 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n"); 438 return -ENODEV; 439 } 440 dev_priv->backlight = 441 backlight_device_register("intel_backlight", 442 &connector->kdev, dev, 443 &intel_panel_bl_ops, &props); 444 445 if (IS_ERR(dev_priv->backlight)) { 446 DRM_ERROR("Failed to register backlight: %ld\n", 447 PTR_ERR(dev_priv->backlight)); 448 dev_priv->backlight = NULL; 449 return -ENODEV; 450 } 451 dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev); 452 return 0; 453 } 454 455 void intel_panel_destroy_backlight(struct drm_device *dev) 456 { 457 struct drm_i915_private *dev_priv = dev->dev_private; 458 if (dev_priv->backlight) { 459 backlight_device_unregister(dev_priv->backlight); 460 dev_priv->backlight = NULL; 461 } 462 } 463 #else 464 int intel_panel_setup_backlight(struct drm_connector *connector) 465 { 466 intel_panel_init_backlight(connector->dev); 467 return 0; 468 } 469 470 void intel_panel_destroy_backlight(struct drm_device *dev) 471 { 472 return; 473 } 474 #endif 475 476 int intel_panel_init(struct intel_panel *panel, 477 struct drm_display_mode *fixed_mode) 478 { 479 panel->fixed_mode = fixed_mode; 480 481 return 0; 482 } 483 484 void intel_panel_fini(struct intel_panel *panel) 485 { 486 struct intel_connector *intel_connector = 487 container_of(panel, struct intel_connector, panel); 488 489 if (panel->fixed_mode) 490 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 491 } 492