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_i915_private *dev_priv)
 134 {
 135         u32 val;
 136
 137         /* Restore the CTL value if it lost, e.g. GPU reset */
 138
 139         if (HAS_PCH_SPLIT(dev_priv->dev)) {
 140                 val = I915_READ(BLC_PWM_PCH_CTL2);
 141                 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
 142                         dev_priv->saveBLC_PWM_CTL2 = val;
 143                 } else if (val == 0) {
 144                         I915_WRITE(BLC_PWM_PCH_CTL2,
 145                                    dev_priv->saveBLC_PWM_CTL2);
 146                         val = dev_priv->saveBLC_PWM_CTL2;
 147                 }
 148         } else {
 149                 val = I915_READ(BLC_PWM_CTL);
 150                 if (dev_priv->saveBLC_PWM_CTL == 0) {
 151                         dev_priv->saveBLC_PWM_CTL = val;
 152                         dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 153                 } else if (val == 0) {
 154                         I915_WRITE(BLC_PWM_CTL,
 155                                    dev_priv->saveBLC_PWM_CTL);
 156                         I915_WRITE(BLC_PWM_CTL2,
 157                                    dev_priv->saveBLC_PWM_CTL2);
 158                         val = dev_priv->saveBLC_PWM_CTL;
 159                 }
 160         }
 161
 162         return val;
 163 }
 164
 165 static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
 166 {
 167         struct drm_i915_private *dev_priv = dev->dev_private;
 168         u32 max;
 169
 170         max = i915_read_blc_pwm_ctl(dev_priv);
 171
 172         if (HAS_PCH_SPLIT(dev)) {
 173                 max >>= 16;
 174         } else {
 175                 if (INTEL_INFO(dev)->gen < 4)
 176                         max >>= 17;
 177                 else
 178                         max >>= 16;
 179
 180                 if (is_backlight_combination_mode(dev))
 181                         max *= 0xff;
 182         }
 183
 184         return max;
 185 }
 186
 187 u32 intel_panel_get_max_backlight(struct drm_device *dev)
 188 {
 189         u32 max;
 190
 191         max = _intel_panel_get_max_backlight(dev);
 192         if (max == 0) {
 193                 /* XXX add code here to query mode clock or hardware clock
 194                  * and program max PWM appropriately.
 195                  */
 196                 pr_warn_once("fixme: max PWM is zero\n");
 197                 return 1;
 198         }
 199
 200         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 201         return max;
 202 }
 203
 204 static int i915_panel_invert_brightness;
 205 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 206         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 207         "report PCI device ID, subsystem vendor and subsystem device ID "
 208         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 209         "It will then be included in an upcoming module version.");
 210 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 211 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 212 {
 213         struct drm_i915_private *dev_priv = dev->dev_private;
 214
 215         if (i915_panel_invert_brightness < 0)
 216                 return val;
 217
 218         if (i915_panel_invert_brightness > 0 ||
 219             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
 220                 return intel_panel_get_max_backlight(dev) - val;
 221
 222         return val;
 223 }
 224
 225 static u32 intel_panel_get_backlight(struct drm_device *dev)
 226 {
 227         struct drm_i915_private *dev_priv = dev->dev_private;
 228         u32 val;
 229
 230         if (HAS_PCH_SPLIT(dev)) {
 231                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 232         } else {
 233                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 234                 if (INTEL_INFO(dev)->gen < 4)
 235                         val >>= 1;
 236
 237                 if (is_backlight_combination_mode(dev)) {
 238                         u8 lbpc;
 239
 240                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 241                         val *= lbpc;
 242                 }
 243         }
 244
 245         val = intel_panel_compute_brightness(dev, val);
 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                 lbpc = level * 0xfe / max + 1;
 273                 level /= lbpc;
 274                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 275         }
 276
 277         tmp = I915_READ(BLC_PWM_CTL);
 278         if (INTEL_INFO(dev)->gen < 4)
 279                 level <<= 1;
 280         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 281         I915_WRITE(BLC_PWM_CTL, tmp | level);
 282 }
 283
 284 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 285 {
 286         struct drm_i915_private *dev_priv = dev->dev_private;
 287
 288         dev_priv->backlight_level = level;
 289         if (dev_priv->backlight_enabled)
 290                 intel_panel_actually_set_backlight(dev, level);
 291 }
 292
 293 void intel_panel_disable_backlight(struct drm_device *dev)
 294 {
 295         struct drm_i915_private *dev_priv = dev->dev_private;
 296
 297         dev_priv->backlight_enabled = false;
 298         intel_panel_actually_set_backlight(dev, 0);
 299
 300         if (INTEL_INFO(dev)->gen >= 4) {
 301                 uint32_t reg, tmp;
 302
 303                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 304
 305                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 306
 307                 if (HAS_PCH_SPLIT(dev)) {
 308                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 309                         tmp &= ~BLM_PCH_PWM_ENABLE;
 310                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 311                 }
 312         }
 313 }
 314
 315 void intel_panel_enable_backlight(struct drm_device *dev,
 316                                   enum pipe pipe)
 317 {
 318         struct drm_i915_private *dev_priv = dev->dev_private;
 319
 320         if (dev_priv->backlight_level == 0)
 321                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 322
 323         if (INTEL_INFO(dev)->gen >= 4) {
 324                 uint32_t reg, tmp;
 325
 326                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 327
 328
 329                 tmp = I915_READ(reg);
 330
 331                 /* Note that this can also get called through dpms changes. And
 332                  * we don't track the backlight dpms state, hence check whether
 333                  * we have to do anything first. */
 334                 if (tmp & BLM_PWM_ENABLE)
 335                         goto set_level;
 336
 337                 if (dev_priv->num_pipe == 3)
 338                         tmp &= ~BLM_PIPE_SELECT_IVB;
 339                 else
 340                         tmp &= ~BLM_PIPE_SELECT;
 341
 342                 tmp |= BLM_PIPE(pipe);
 343                 tmp &= ~BLM_PWM_ENABLE;
 344
 345                 I915_WRITE(reg, tmp);
 346                 POSTING_READ(reg);
 347                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
 348
 349                 if (HAS_PCH_SPLIT(dev)) {
 350                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 351                         tmp |= BLM_PCH_PWM_ENABLE;
 352                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 353                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 354                 }
 355         }
 356
 357 set_level:
 358         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 359          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 360          * registers are set.
 361          */
 362         dev_priv->backlight_enabled = true;
 363         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 364 }
 365
 366 static void intel_panel_init_backlight(struct drm_device *dev)
 367 {
 368         struct drm_i915_private *dev_priv = dev->dev_private;
 369
 370         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 371         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 372 }
 373
 374 enum drm_connector_status
 375 intel_panel_detect(struct drm_device *dev)
 376 {
 377 #if 0
 378         struct drm_i915_private *dev_priv = dev->dev_private;
 379 #endif
 380
 381         if (i915_panel_ignore_lid)
 382                 return i915_panel_ignore_lid > 0 ?
 383                         connector_status_connected :
 384                         connector_status_disconnected;
 385
 386         /* opregion lid state on HP 2540p is wrong at boot up,
 387          * appears to be either the BIOS or Linux ACPI fault */
 388 #if 0
 389         /* Assume that the BIOS does not lie through the OpRegion... */
 390         if (dev_priv->opregion.lid_state)
 391                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 392                         connector_status_connected :
 393                         connector_status_disconnected;
 394 #endif
 395
 396         return connector_status_unknown;
 397 }
 398
 399 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 400 static int intel_panel_update_status(struct backlight_device *bd)
 401 {
 402         struct drm_device *dev = bl_get_data(bd);
 403         intel_panel_set_backlight(dev, bd->props.brightness);
 404         return 0;
 405 }
 406
 407 static int intel_panel_get_brightness(struct backlight_device *bd)
 408 {
 409         struct drm_device *dev = bl_get_data(bd);
 410         struct drm_i915_private *dev_priv = dev->dev_private;
 411         return dev_priv->backlight_level;
 412 }
 413
 414 static const struct backlight_ops intel_panel_bl_ops = {
 415         .update_status = intel_panel_update_status,
 416         .get_brightness = intel_panel_get_brightness,
 417 };
 418
 419 int intel_panel_setup_backlight(struct drm_device *dev)
 420 {
 421         struct drm_i915_private *dev_priv = dev->dev_private;
 422         struct backlight_properties props;
 423         struct drm_connector *connector;
 424
 425         intel_panel_init_backlight(dev);
 426
 427         if (dev_priv->int_lvds_connector)
 428                 connector = dev_priv->int_lvds_connector;
 429         else if (dev_priv->int_edp_connector)
 430                 connector = dev_priv->int_edp_connector;
 431         else
 432                 return -ENODEV;
 433
 434         memset(&props, 0, sizeof(props));
 435         props.type = BACKLIGHT_RAW;
 436         props.max_brightness = _intel_panel_get_max_backlight(dev);
 437         if (props.max_brightness == 0) {
 438                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
 439                 return -ENODEV;
 440         }
 441         dev_priv->backlight =
 442                 backlight_device_register("intel_backlight",
 443                                           &connector->kdev, dev,
 444                                           &intel_panel_bl_ops, &props);
 445
 446         if (IS_ERR(dev_priv->backlight)) {
 447                 DRM_ERROR("Failed to register backlight: %ld\n",
 448                           PTR_ERR(dev_priv->backlight));
 449                 dev_priv->backlight = NULL;
 450                 return -ENODEV;
 451         }
 452         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 453         return 0;
 454 }
 455
 456 void intel_panel_destroy_backlight(struct drm_device *dev)
 457 {
 458         struct drm_i915_private *dev_priv = dev->dev_private;
 459         if (dev_priv->backlight)
 460                 backlight_device_unregister(dev_priv->backlight);
 461 }
 462 #else
 463 int intel_panel_setup_backlight(struct drm_device *dev)
 464 {
 465         intel_panel_init_backlight(dev);
 466         return 0;
 467 }
 468
 469 void intel_panel_destroy_backlight(struct drm_device *dev)
 470 {
 471         return;
 472 }
 473 #endif