drivers/gpu/drm/i915/intel_panel.c

   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 /* XXX: query mode clock or hardware clock and program max PWM appropriately
 134  * when it's 0.
 135  */
 136 static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
 137 {
 138         struct drm_i915_private *dev_priv = dev->dev_private;
 139         u32 val;
 140
 141         WARN_ON(!spin_is_locked(&dev_priv->backlight.lock));
 142
 143         /* Restore the CTL value if it lost, e.g. GPU reset */
 144
 145         if (HAS_PCH_SPLIT(dev_priv->dev)) {
 146                 val = I915_READ(BLC_PWM_PCH_CTL2);
 147                 if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
 148                         dev_priv->regfile.saveBLC_PWM_CTL2 = val;
 149                 } else if (val == 0) {
 150                         val = dev_priv->regfile.saveBLC_PWM_CTL2;
 151                         I915_WRITE(BLC_PWM_PCH_CTL2, val);
 152                 }
 153         } else {
 154                 val = I915_READ(BLC_PWM_CTL);
 155                 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 156                         dev_priv->regfile.saveBLC_PWM_CTL = val;
 157                         if (INTEL_INFO(dev)->gen >= 4)
 158                                 dev_priv->regfile.saveBLC_PWM_CTL2 =
 159                                         I915_READ(BLC_PWM_CTL2);
 160                 } else if (val == 0) {
 161                         val = dev_priv->regfile.saveBLC_PWM_CTL;
 162                         I915_WRITE(BLC_PWM_CTL, val);
 163                         if (INTEL_INFO(dev)->gen >= 4)
 164                                 I915_WRITE(BLC_PWM_CTL2,
 165                                            dev_priv->regfile.saveBLC_PWM_CTL2);
 166                 }
 167         }
 168
 169         return val;
 170 }
 171
 172 static u32 intel_panel_get_max_backlight(struct drm_device *dev)
 173 {
 174         u32 max;
 175
 176         max = i915_read_blc_pwm_ctl(dev);
 177
 178         if (HAS_PCH_SPLIT(dev)) {
 179                 max >>= 16;
 180         } else {
 181                 if (INTEL_INFO(dev)->gen < 4)
 182                         max >>= 17;
 183                 else
 184                         max >>= 16;
 185
 186                 if (is_backlight_combination_mode(dev))
 187                         max *= 0xff;
 188         }
 189
 190         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 191
 192         return max;
 193 }
 194
 195 static int i915_panel_invert_brightness;
 196 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 197         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 198         "report PCI device ID, subsystem vendor and subsystem device ID "
 199         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 200         "It will then be included in an upcoming module version.");
 201 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 202 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 203 {
 204         struct drm_i915_private *dev_priv = dev->dev_private;
 205
 206         if (i915_panel_invert_brightness < 0)
 207                 return val;
 208
 209         if (i915_panel_invert_brightness > 0 ||
 210             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
 211                 u32 max = intel_panel_get_max_backlight(dev);
 212                 if (max)
 213                         return max - val;
 214         }
 215
 216         return val;
 217 }
 218
 219 static u32 intel_panel_get_backlight(struct drm_device *dev)
 220 {
 221         struct drm_i915_private *dev_priv = dev->dev_private;
 222         u32 val;
 223         unsigned long flags;
 224
 225         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 226
 227         if (HAS_PCH_SPLIT(dev)) {
 228                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 229         } else {
 230                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 231                 if (INTEL_INFO(dev)->gen < 4)
 232                         val >>= 1;
 233
 234                 if (is_backlight_combination_mode(dev)) {
 235                         u8 lbpc;
 236
 237                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 238                         val *= lbpc;
 239                 }
 240         }
 241
 242         val = intel_panel_compute_brightness(dev, val);
 243
 244         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 245
 246         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 247         return val;
 248 }
 249
 250 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 251 {
 252         struct drm_i915_private *dev_priv = dev->dev_private;
 253         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 254         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 255 }
 256
 257 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 258 {
 259         struct drm_i915_private *dev_priv = dev->dev_private;
 260         u32 tmp;
 261
 262         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 263         level = intel_panel_compute_brightness(dev, level);
 264
 265         if (HAS_PCH_SPLIT(dev))
 266                 return intel_pch_panel_set_backlight(dev, level);
 267
 268         if (is_backlight_combination_mode(dev)) {
 269                 u32 max = intel_panel_get_max_backlight(dev);
 270                 u8 lbpc;
 271
 272                 /* we're screwed, but keep behaviour backwards compatible */
 273                 if (!max)
 274                         max = 1;
 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 /* set backlight brightness to level in range [0..max] */
 289 void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max)
 290 {
 291         struct drm_i915_private *dev_priv = dev->dev_private;
 292         u32 freq;
 293         unsigned long flags;
 294
 295         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 296
 297         freq = intel_panel_get_max_backlight(dev);
 298         if (!freq) {
 299                 /* we are screwed, bail out */
 300                 goto out;
 301         }
 302
 303         /* scale to hardware */
 304         level = level * freq / max;
 305
 306         dev_priv->backlight.level = level;
 307         if (dev_priv->backlight.device)
 308                 dev_priv->backlight.device->props.brightness = level;
 309
 310         if (dev_priv->backlight.enabled)
 311                 intel_panel_actually_set_backlight(dev, level);
 312 out:
 313         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 314 }
 315
 316 void intel_panel_disable_backlight(struct drm_device *dev)
 317 {
 318         struct drm_i915_private *dev_priv = dev->dev_private;
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 322
 323         dev_priv->backlight.enabled = false;
 324         intel_panel_actually_set_backlight(dev, 0);
 325
 326         if (INTEL_INFO(dev)->gen >= 4) {
 327                 uint32_t reg, tmp;
 328
 329                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 330
 331                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 332
 333                 if (HAS_PCH_SPLIT(dev)) {
 334                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 335                         tmp &= ~BLM_PCH_PWM_ENABLE;
 336                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 337                 }
 338         }
 339
 340         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 341 }
 342
 343 void intel_panel_enable_backlight(struct drm_device *dev,
 344                                   enum pipe pipe)
 345 {
 346         struct drm_i915_private *dev_priv = dev->dev_private;
 347         unsigned long flags;
 348
 349         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 350
 351         if (dev_priv->backlight.level == 0) {
 352                 dev_priv->backlight.level = intel_panel_get_max_backlight(dev);
 353                 if (dev_priv->backlight.device)
 354                         dev_priv->backlight.device->props.brightness =
 355                                 dev_priv->backlight.level;
 356         }
 357
 358         if (INTEL_INFO(dev)->gen >= 4) {
 359                 uint32_t reg, tmp;
 360
 361                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 362
 363
 364                 tmp = I915_READ(reg);
 365
 366                 /* Note that this can also get called through dpms changes. And
 367                  * we don't track the backlight dpms state, hence check whether
 368                  * we have to do anything first. */
 369                 if (tmp & BLM_PWM_ENABLE)
 370                         goto set_level;
 371
 372                 if (INTEL_INFO(dev)->num_pipes == 3)
 373                         tmp &= ~BLM_PIPE_SELECT_IVB;
 374                 else
 375                         tmp &= ~BLM_PIPE_SELECT;
 376
 377                 tmp |= BLM_PIPE(pipe);
 378                 tmp &= ~BLM_PWM_ENABLE;
 379
 380                 I915_WRITE(reg, tmp);
 381                 POSTING_READ(reg);
 382                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
 383
 384                 if (HAS_PCH_SPLIT(dev)) {
 385                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 386                         tmp |= BLM_PCH_PWM_ENABLE;
 387                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 388                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 389                 }
 390         }
 391
 392 set_level:
 393         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 394          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 395          * registers are set.
 396          */
 397         dev_priv->backlight.enabled = true;
 398         intel_panel_actually_set_backlight(dev, dev_priv->backlight.level);
 399
 400         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 401 }
 402
 403 static void intel_panel_init_backlight(struct drm_device *dev)
 404 {
 405         struct drm_i915_private *dev_priv = dev->dev_private;
 406
 407         dev_priv->backlight.level = intel_panel_get_backlight(dev);
 408         dev_priv->backlight.enabled = dev_priv->backlight.level != 0;
 409 }
 410
 411 enum drm_connector_status
 412 intel_panel_detect(struct drm_device *dev)
 413 {
 414         struct drm_i915_private *dev_priv = dev->dev_private;
 415
 416         /* Assume that the BIOS does not lie through the OpRegion... */
 417         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
 418                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 419                         connector_status_connected :
 420                         connector_status_disconnected;
 421         }
 422
 423         switch (i915_panel_ignore_lid) {
 424         case -2:
 425                 return connector_status_connected;
 426         case -1:
 427                 return connector_status_disconnected;
 428         default:
 429                 return connector_status_unknown;
 430         }
 431 }
 432
 433 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 434 static int intel_panel_update_status(struct backlight_device *bd)
 435 {
 436         struct drm_device *dev = bl_get_data(bd);
 437         intel_panel_set_backlight(dev, bd->props.brightness,
 438                                   bd->props.max_brightness);
 439         return 0;
 440 }
 441
 442 static int intel_panel_get_brightness(struct backlight_device *bd)
 443 {
 444         struct drm_device *dev = bl_get_data(bd);
 445         return intel_panel_get_backlight(dev);
 446 }
 447
 448 static const struct backlight_ops intel_panel_bl_ops = {
 449         .update_status = intel_panel_update_status,
 450         .get_brightness = intel_panel_get_brightness,
 451 };
 452
 453 int intel_panel_setup_backlight(struct drm_connector *connector)
 454 {
 455         struct drm_device *dev = connector->dev;
 456         struct drm_i915_private *dev_priv = dev->dev_private;
 457         struct backlight_properties props;
 458         unsigned long flags;
 459
 460         intel_panel_init_backlight(dev);
 461
 462         if (WARN_ON(dev_priv->backlight.device))
 463                 return -ENODEV;
 464
 465         memset(&props, 0, sizeof(props));
 466         props.type = BACKLIGHT_RAW;
 467         props.brightness = dev_priv->backlight.level;
 468
 469         spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 470         props.max_brightness = intel_panel_get_max_backlight(dev);
 471         spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 472
 473         if (props.max_brightness == 0) {
 474                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
 475                 return -ENODEV;
 476         }
 477         dev_priv->backlight.device =
 478                 backlight_device_register("intel_backlight",
 479                                           &connector->kdev, dev,
 480                                           &intel_panel_bl_ops, &props);
 481
 482         if (IS_ERR(dev_priv->backlight.device)) {
 483                 DRM_ERROR("Failed to register backlight: %ld\n",
 484                           PTR_ERR(dev_priv->backlight.device));
 485                 dev_priv->backlight.device = NULL;
 486                 return -ENODEV;
 487         }
 488         return 0;
 489 }
 490
 491 void intel_panel_destroy_backlight(struct drm_device *dev)
 492 {
 493         struct drm_i915_private *dev_priv = dev->dev_private;
 494         if (dev_priv->backlight.device) {
 495                 backlight_device_unregister(dev_priv->backlight.device);
 496                 dev_priv->backlight.device = NULL;
 497         }
 498 }
 499 #else
 500 int intel_panel_setup_backlight(struct drm_connector *connector)
 501 {
 502         intel_panel_init_backlight(connector->dev);
 503         return 0;
 504 }
 505
 506 void intel_panel_destroy_backlight(struct drm_device *dev)
 507 {
 508         return;
 509 }
 510 #endif
 511
 512 int intel_panel_init(struct intel_panel *panel,
 513                      struct drm_display_mode *fixed_mode)
 514 {
 515         panel->fixed_mode = fixed_mode;
 516
 517         return 0;
 518 }
 519
 520 void intel_panel_fini(struct intel_panel *panel)
 521 {
 522         struct intel_connector *intel_connector =
 523                 container_of(panel, struct intel_connector, panel);
 524
 525         if (panel->fixed_mode)
 526                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 527 }