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 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                 pr_warn_once("fixme: max PWM is zero\n");
 198                 return 1;
 199         }
 200
 201         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 202         return max;
 203 }
 204
 205 static int i915_panel_invert_brightness;
 206 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 207         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 208         "report PCI device ID, subsystem vendor and subsystem device ID "
 209         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 210         "It will then be included in an upcoming module version.");
 211 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 212 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 213 {
 214         struct drm_i915_private *dev_priv = dev->dev_private;
 215
 216         if (i915_panel_invert_brightness < 0)
 217                 return val;
 218
 219         if (i915_panel_invert_brightness > 0 ||
 220             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
 221                 return intel_panel_get_max_backlight(dev) - val;
 222
 223         return val;
 224 }
 225
 226 static u32 intel_panel_get_backlight(struct drm_device *dev)
 227 {
 228         struct drm_i915_private *dev_priv = dev->dev_private;
 229         u32 val;
 230
 231         if (HAS_PCH_SPLIT(dev)) {
 232                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 233         } else {
 234                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 235                 if (INTEL_INFO(dev)->gen < 4)
 236                         val >>= 1;
 237
 238                 if (is_backlight_combination_mode(dev)) {
 239                         u8 lbpc;
 240
 241                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 242                         val *= lbpc;
 243                 }
 244         }
 245
 246         val = intel_panel_compute_brightness(dev, val);
 247         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 248         return val;
 249 }
 250
 251 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 252 {
 253         struct drm_i915_private *dev_priv = dev->dev_private;
 254         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 255         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 256 }
 257
 258 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 259 {
 260         struct drm_i915_private *dev_priv = dev->dev_private;
 261         u32 tmp;
 262
 263         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 264         level = intel_panel_compute_brightness(dev, level);
 265
 266         if (HAS_PCH_SPLIT(dev))
 267                 return intel_pch_panel_set_backlight(dev, level);
 268
 269         if (is_backlight_combination_mode(dev)) {
 270                 u32 max = intel_panel_get_max_backlight(dev);
 271                 u8 lbpc;
 272
 273                 lbpc = level * 0xfe / max + 1;
 274                 level /= lbpc;
 275                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 276         }
 277
 278         tmp = I915_READ(BLC_PWM_CTL);
 279         if (INTEL_INFO(dev)->gen < 4)
 280                 level <<= 1;
 281         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 282         I915_WRITE(BLC_PWM_CTL, tmp | level);
 283 }
 284
 285 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 286 {
 287         struct drm_i915_private *dev_priv = dev->dev_private;
 288
 289         dev_priv->backlight_level = level;
 290         if (dev_priv->backlight_enabled)
 291                 intel_panel_actually_set_backlight(dev, level);
 292 }
 293
 294 void intel_panel_disable_backlight(struct drm_device *dev)
 295 {
 296         struct drm_i915_private *dev_priv = dev->dev_private;
 297
 298         dev_priv->backlight_enabled = false;
 299         intel_panel_actually_set_backlight(dev, 0);
 300
 301         if (INTEL_INFO(dev)->gen >= 4) {
 302                 uint32_t reg, tmp;
 303
 304                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 305
 306                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 307
 308                 if (HAS_PCH_SPLIT(dev)) {
 309                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 310                         tmp &= ~BLM_PCH_PWM_ENABLE;
 311                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 312                 }
 313         }
 314 }
 315
 316 void intel_panel_enable_backlight(struct drm_device *dev,
 317                                   enum pipe pipe)
 318 {
 319         struct drm_i915_private *dev_priv = dev->dev_private;
 320
 321         if (dev_priv->backlight_level == 0)
 322                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 323
 324         dev_priv->backlight_enabled = true;
 325         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 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 (INTEL_INFO(dev)->num_pipes == 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         /* Check the current backlight level and try to set again if it's zero.
 363          * On some machines, BLC_PWM_CPU_CTL is cleared to zero automatically
 364          * when BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1 are written.
 365          */
 366         if (!intel_panel_get_backlight(dev))
 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         memset(&props, 0, sizeof(props));
 429         props.type = BACKLIGHT_RAW;
 430         props.max_brightness = _intel_panel_get_max_backlight(dev);
 431         if (props.max_brightness == 0) {
 432                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
 433                 return -ENODEV;
 434         }
 435         dev_priv->backlight =
 436                 backlight_device_register("intel_backlight",
 437                                           &connector->kdev, dev,
 438                                           &intel_panel_bl_ops, &props);
 439
 440         if (IS_ERR(dev_priv->backlight)) {
 441                 DRM_ERROR("Failed to register backlight: %ld\n",
 442                           PTR_ERR(dev_priv->backlight));
 443                 dev_priv->backlight = NULL;
 444                 return -ENODEV;
 445         }
 446         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 447         return 0;
 448 }
 449
 450 void intel_panel_destroy_backlight(struct drm_device *dev)
 451 {
 452         struct drm_i915_private *dev_priv = dev->dev_private;
 453         if (dev_priv->backlight)
 454                 backlight_device_unregister(dev_priv->backlight);
 455 }
 456 #else
 457 int intel_panel_setup_backlight(struct drm_connector *connector)
 458 {
 459         intel_panel_init_backlight(connector->dev);
 460         return 0;
 461 }
 462
 463 void intel_panel_destroy_backlight(struct drm_device *dev)
 464 {
 465         return;
 466 }
 467 #endif
 468
 469 int intel_panel_init(struct intel_panel *panel,
 470                      struct drm_display_mode *fixed_mode)
 471 {
 472         panel->fixed_mode = fixed_mode;
 473
 474         return 0;
 475 }
 476
 477 void intel_panel_fini(struct intel_panel *panel)
 478 {
 479         struct intel_connector *intel_connector =
 480                 container_of(panel, struct intel_connector, panel);
 481
 482         if (panel->fixed_mode)
 483                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 484 }