sys/dev/drm2/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 <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <dev/drm2/drmP.h>
  37 #include <dev/drm2/i915/intel_drv.h>
  38
  39 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  40
  41 void
  42 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
  43                        struct drm_display_mode *adjusted_mode)
  44 {
  45         adjusted_mode->hdisplay = fixed_mode->hdisplay;
  46         adjusted_mode->hsync_start = fixed_mode->hsync_start;
  47         adjusted_mode->hsync_end = fixed_mode->hsync_end;
  48         adjusted_mode->htotal = fixed_mode->htotal;
  49
  50         adjusted_mode->vdisplay = fixed_mode->vdisplay;
  51         adjusted_mode->vsync_start = fixed_mode->vsync_start;
  52         adjusted_mode->vsync_end = fixed_mode->vsync_end;
  53         adjusted_mode->vtotal = fixed_mode->vtotal;
  54
  55         adjusted_mode->clock = fixed_mode->clock;
  56 }
  57
  58 /* adjusted_mode has been preset to be the panel's fixed mode */
  59 void
  60 intel_pch_panel_fitting(struct drm_device *dev,
  61                         int fitting_mode,
  62                         const struct drm_display_mode *mode,
  63                         struct drm_display_mode *adjusted_mode)
  64 {
  65         struct drm_i915_private *dev_priv = dev->dev_private;
  66         int x, y, width, height;
  67
  68         x = y = width = height = 0;
  69
  70         /* Native modes don't need fitting */
  71         if (adjusted_mode->hdisplay == mode->hdisplay &&
  72             adjusted_mode->vdisplay == mode->vdisplay)
  73                 goto done;
  74
  75         switch (fitting_mode) {
  76         case DRM_MODE_SCALE_CENTER:
  77                 width = mode->hdisplay;
  78                 height = mode->vdisplay;
  79                 x = (adjusted_mode->hdisplay - width + 1)/2;
  80                 y = (adjusted_mode->vdisplay - height + 1)/2;
  81                 break;
  82
  83         case DRM_MODE_SCALE_ASPECT:
  84                 /* Scale but preserve the aspect ratio */
  85                 {
  86                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
  87                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
  88                         if (scaled_width > scaled_height) { /* pillar */
  89                                 width = scaled_height / mode->vdisplay;
  90                                 if (width & 1)
  91                                         width++;
  92                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
  93                                 y = 0;
  94                                 height = adjusted_mode->vdisplay;
  95                         } else if (scaled_width < scaled_height) { /* letter */
  96                                 height = scaled_width / mode->hdisplay;
  97                                 if (height & 1)
  98                                     height++;
  99                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
 100                                 x = 0;
 101                                 width = adjusted_mode->hdisplay;
 102                         } else {
 103                                 x = y = 0;
 104                                 width = adjusted_mode->hdisplay;
 105                                 height = adjusted_mode->vdisplay;
 106                         }
 107                 }
 108                 break;
 109
 110         default:
 111         case DRM_MODE_SCALE_FULLSCREEN:
 112                 x = y = 0;
 113                 width = adjusted_mode->hdisplay;
 114                 height = adjusted_mode->vdisplay;
 115                 break;
 116         }
 117
 118 done:
 119         dev_priv->pch_pf_pos = (x << 16) | y;
 120         dev_priv->pch_pf_size = (width << 16) | height;
 121 }
 122
 123 static int is_backlight_combination_mode(struct drm_device *dev)
 124 {
 125         struct drm_i915_private *dev_priv = dev->dev_private;
 126
 127         if (INTEL_INFO(dev)->gen >= 4)
 128                 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
 129
 130         if (IS_GEN2(dev))
 131                 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
 132
 133         return 0;
 134 }
 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         /* Restore the CTL value if it lost, e.g. GPU reset */
 142
 143         if (HAS_PCH_SPLIT(dev_priv->dev)) {
 144                 val = I915_READ(BLC_PWM_PCH_CTL2);
 145                 if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
 146                         dev_priv->regfile.saveBLC_PWM_CTL2 = val;
 147                 } else if (val == 0) {
 148                         val = dev_priv->regfile.saveBLC_PWM_CTL2;
 149                         I915_WRITE(BLC_PWM_PCH_CTL2, val);
 150                 }
 151         } else {
 152                 val = I915_READ(BLC_PWM_CTL);
 153                 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 154                         dev_priv->regfile.saveBLC_PWM_CTL = val;
 155                         if (INTEL_INFO(dev)->gen >= 4)
 156                                 dev_priv->regfile.saveBLC_PWM_CTL2 =
 157                                         I915_READ(BLC_PWM_CTL2);
 158                 } else if (val == 0) {
 159                         val = dev_priv->regfile.saveBLC_PWM_CTL;
 160                         I915_WRITE(BLC_PWM_CTL, val);
 161                         if (INTEL_INFO(dev)->gen >= 4)
 162                                 I915_WRITE(BLC_PWM_CTL2,
 163                                            dev_priv->regfile.saveBLC_PWM_CTL2);
 164                 }
 165         }
 166
 167         return val;
 168 }
 169
 170 static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
 171 {
 172         u32 max;
 173
 174         max = i915_read_blc_pwm_ctl(dev);
 175
 176         if (HAS_PCH_SPLIT(dev)) {
 177                 max >>= 16;
 178         } else {
 179                 if (INTEL_INFO(dev)->gen < 4)
 180                         max >>= 17;
 181                 else
 182                         max >>= 16;
 183
 184                 if (is_backlight_combination_mode(dev))
 185                         max *= 0xff;
 186         }
 187
 188         return max;
 189 }
 190
 191 u32 intel_panel_get_max_backlight(struct drm_device *dev)
 192 {
 193         u32 max;
 194
 195         max = _intel_panel_get_max_backlight(dev);
 196         if (max == 0) {
 197                 /* XXX add code here to query mode clock or hardware clock
 198                  * and program max PWM appropriately.
 199                  */
 200                 pr_warn_once("fixme: max PWM is zero\n");
 201                 return 1;
 202         }
 203
 204         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 205         return max;
 206 }
 207
 208 static int i915_panel_invert_brightness;
 209 TUNABLE_INT("drm.i915.invert_brightness", &i915_panel_invert_brightness);
 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 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 216 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 217 {
 218         struct drm_i915_private *dev_priv = dev->dev_private;
 219
 220         if (i915_panel_invert_brightness < 0)
 221                 return val;
 222
 223         if (i915_panel_invert_brightness > 0 ||
 224             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
 225                 return intel_panel_get_max_backlight(dev) - val;
 226
 227         return val;
 228 }
 229
 230 static u32 intel_panel_get_backlight(struct drm_device *dev)
 231 {
 232         struct drm_i915_private *dev_priv = dev->dev_private;
 233         u32 val;
 234
 235         if (HAS_PCH_SPLIT(dev)) {
 236                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 237         } else {
 238                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 239                 if (INTEL_INFO(dev)->gen < 4)
 240                         val >>= 1;
 241
 242                 if (is_backlight_combination_mode(dev)) {
 243                         u8 lbpc;
 244
 245                         pci_read_config_byte(dev->dev, PCI_LBPC, &lbpc);
 246                         val *= lbpc;
 247                 }
 248         }
 249
 250         val = intel_panel_compute_brightness(dev, val);
 251         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 252         return val;
 253 }
 254
 255 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 256 {
 257         struct drm_i915_private *dev_priv = dev->dev_private;
 258         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 259         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 260 }
 261
 262 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 263 {
 264         struct drm_i915_private *dev_priv = dev->dev_private;
 265         u32 tmp;
 266
 267         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 268         level = intel_panel_compute_brightness(dev, level);
 269
 270         if (HAS_PCH_SPLIT(dev))
 271                 return intel_pch_panel_set_backlight(dev, level);
 272
 273         if (is_backlight_combination_mode(dev)) {
 274                 u32 max = intel_panel_get_max_backlight(dev);
 275                 u8 lbpc;
 276
 277                 lbpc = level * 0xfe / max + 1;
 278                 level /= lbpc;
 279                 pci_write_config_byte(dev->dev, PCI_LBPC, lbpc);
 280         }
 281
 282         tmp = I915_READ(BLC_PWM_CTL);
 283         if (INTEL_INFO(dev)->gen < 4)
 284                 level <<= 1;
 285         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 286         I915_WRITE(BLC_PWM_CTL, tmp | level);
 287 }
 288
 289 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 290 {
 291         struct drm_i915_private *dev_priv = dev->dev_private;
 292
 293         dev_priv->backlight_level = level;
 294         if (dev_priv->backlight_enabled)
 295                 intel_panel_actually_set_backlight(dev, level);
 296 }
 297
 298 void intel_panel_disable_backlight(struct drm_device *dev)
 299 {
 300         struct drm_i915_private *dev_priv = dev->dev_private;
 301
 302         dev_priv->backlight_enabled = false;
 303         intel_panel_actually_set_backlight(dev, 0);
 304
 305         if (INTEL_INFO(dev)->gen >= 4) {
 306                 uint32_t reg, tmp;
 307
 308                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 309
 310                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 311
 312                 if (HAS_PCH_SPLIT(dev)) {
 313                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 314                         tmp &= ~BLM_PCH_PWM_ENABLE;
 315                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 316                 }
 317         }
 318 }
 319
 320 void intel_panel_enable_backlight(struct drm_device *dev,
 321                                   enum pipe pipe)
 322 {
 323         struct drm_i915_private *dev_priv = dev->dev_private;
 324
 325         if (dev_priv->backlight_level == 0)
 326                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 327
 328         if (INTEL_INFO(dev)->gen >= 4) {
 329                 uint32_t reg, tmp;
 330
 331                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 332
 333
 334                 tmp = I915_READ(reg);
 335
 336                 /* Note that this can also get called through dpms changes. And
 337                  * we don't track the backlight dpms state, hence check whether
 338                  * we have to do anything first. */
 339                 if (tmp & BLM_PWM_ENABLE)
 340                         goto set_level;
 341
 342                 if (dev_priv->num_pipe == 3)
 343                         tmp &= ~BLM_PIPE_SELECT_IVB;
 344                 else
 345                         tmp &= ~BLM_PIPE_SELECT;
 346
 347                 tmp |= BLM_PIPE(pipe);
 348                 tmp &= ~BLM_PWM_ENABLE;
 349
 350                 I915_WRITE(reg, tmp);
 351                 POSTING_READ(reg);
 352                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
 353
 354                 if (HAS_PCH_SPLIT(dev)) {
 355                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 356                         tmp |= BLM_PCH_PWM_ENABLE;
 357                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 358                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 359                 }
 360         }
 361
 362 set_level:
 363         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 364          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 365          * registers are set.
 366          */
 367         dev_priv->backlight_enabled = true;
 368         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 369 }
 370
 371 static void intel_panel_init_backlight(struct drm_device *dev)
 372 {
 373         struct drm_i915_private *dev_priv = dev->dev_private;
 374
 375         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 376         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 377 }
 378
 379 enum drm_connector_status
 380 intel_panel_detect(struct drm_device *dev)
 381 {
 382         struct drm_i915_private *dev_priv = dev->dev_private;
 383
 384         /* Assume that the BIOS does not lie through the OpRegion... */
 385         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
 386                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 387                         connector_status_connected :
 388                         connector_status_disconnected;
 389         }
 390
 391         switch (i915_panel_ignore_lid) {
 392         case -2:
 393                 return connector_status_connected;
 394         case -1:
 395                 return connector_status_disconnected;
 396         default:
 397                 return connector_status_unknown;
 398         }
 399 }
 400
 401 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 402 static int intel_panel_update_status(struct backlight_device *bd)
 403 {
 404         struct drm_device *dev = bl_get_data(bd);
 405         intel_panel_set_backlight(dev, bd->props.brightness);
 406         return 0;
 407 }
 408
 409 static int intel_panel_get_brightness(struct backlight_device *bd)
 410 {
 411         struct drm_device *dev = bl_get_data(bd);
 412         struct drm_i915_private *dev_priv = dev->dev_private;
 413         return dev_priv->backlight_level;
 414 }
 415
 416 static const struct backlight_ops intel_panel_bl_ops = {
 417         .update_status = intel_panel_update_status,
 418         .get_brightness = intel_panel_get_brightness,
 419 };
 420
 421 int intel_panel_setup_backlight(struct drm_connector *connector)
 422 {
 423         struct drm_device *dev = connector->dev;
 424         struct drm_i915_private *dev_priv = dev->dev_private;
 425         struct backlight_properties props;
 426
 427         intel_panel_init_backlight(dev);
 428
 429         if (WARN_ON(dev_priv->backlight))
 430                 return -ENODEV;
 431
 432         memset(&props, 0, sizeof(props));
 433         props.type = BACKLIGHT_RAW;
 434         props.max_brightness = _intel_panel_get_max_backlight(dev);
 435         if (props.max_brightness == 0) {
 436                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
 437                 return -ENODEV;
 438         }
 439         dev_priv->backlight =
 440                 backlight_device_register("intel_backlight",
 441                                           &connector->kdev, dev,
 442                                           &intel_panel_bl_ops, &props);
 443
 444         if (IS_ERR(dev_priv->backlight)) {
 445                 DRM_ERROR("Failed to register backlight: %ld\n",
 446                           PTR_ERR(dev_priv->backlight));
 447                 dev_priv->backlight = NULL;
 448                 return -ENODEV;
 449         }
 450         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 451         return 0;
 452 }
 453
 454 void intel_panel_destroy_backlight(struct drm_device *dev)
 455 {
 456         struct drm_i915_private *dev_priv = dev->dev_private;
 457         if (dev_priv->backlight) {
 458                 backlight_device_unregister(dev_priv->backlight);
 459                 dev_priv->backlight = NULL;
 460         }
 461 }
 462 #else
 463 int intel_panel_setup_backlight(struct drm_connector *connector)
 464 {
 465         intel_panel_init_backlight(connector->dev);
 466         return 0;
 467 }
 468
 469 void intel_panel_destroy_backlight(struct drm_device *dev)
 470 {
 471         return;
 472 }
 473 #endif
 474
 475 int intel_panel_init(struct intel_panel *panel,
 476                      struct drm_display_mode *fixed_mode)
 477 {
 478         panel->fixed_mode = fixed_mode;
 479
 480         return 0;
 481 }
 482
 483 void intel_panel_fini(struct intel_panel *panel)
 484 {
 485         struct intel_connector *intel_connector =
 486                 container_of(panel, struct intel_connector, panel);
 487
 488         if (panel->fixed_mode)
 489                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 490 }