sys/dev/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 #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                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 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_byte(dev->pdev, PCI_LBPC, lbpc);
 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
 465 /*
 466  * Read max backlight level
 467  */
 468 static int
 469 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
 470 {
 471         int err, val;
 472
 473         val = intel_panel_get_max_backlight((struct drm_device *)arg1);
 474         err = sysctl_handle_int(oidp, &val, 0, req);
 475         return(err);
 476 }
 477
 478 /*
 479  * Read/write backlight level
 480  */
 481 static int
 482 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
 483 {
 484         struct drm_i915_private *dev_priv;
 485         int err, val;
 486
 487         dev_priv = ((struct drm_device *)arg1)->dev_private;
 488         val = dev_priv->backlight_level;
 489
 490         err = sysctl_handle_int(oidp, &val, 0, req);
 491         if (err != 0 || req->newptr == NULL) {
 492                 return(err);
 493         }
 494
 495         if (val != dev_priv->backlight_level && val >=0 &&
 496                         val <= intel_panel_get_max_backlight((struct drm_device *)arg1)) {
 497                 intel_panel_set_backlight(arg1, val);
 498         }
 499
 500         return(err);
 501 }
 502
 503 int intel_panel_setup_backlight(struct drm_connector *connector)
 504 {
 505         intel_panel_init_backlight(connector->dev);
 506
 507         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
 508                         OID_AUTO, "backlight_max",
 509                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
 510                         connector->dev, sizeof(int),
 511                         sysctl_backlight_max,
 512                         "I", "Max backlight level");
 513         SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
 514                         OID_AUTO, "backlight_level",
 515                         CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
 516                         connector->dev, sizeof(int),
 517                         sysctl_backlight_handler,
 518                         "I", "Backlight level");
 519         return 0;
 520 }
 521
 522 void intel_panel_destroy_backlight(struct drm_device *dev)
 523 {
 524         return;
 525 }
 526
 527 #endif
 528
 529 int intel_panel_init(struct intel_panel *panel,
 530                      struct drm_display_mode *fixed_mode)
 531 {
 532         panel->fixed_mode = fixed_mode;
 533
 534         return 0;
 535 }
 536
 537 void intel_panel_fini(struct intel_panel *panel)
 538 {
 539         struct intel_connector *intel_connector =
 540                 container_of(panel, struct intel_connector, panel);
 541
 542         if (panel->fixed_mode)
 543                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 544 }