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 #include "intel_drv.h"
  34
  35 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  36
  37 void
  38 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
  39                        struct drm_display_mode *adjusted_mode)
  40 {
  41         adjusted_mode->hdisplay = fixed_mode->hdisplay;
  42         adjusted_mode->hsync_start = fixed_mode->hsync_start;
  43         adjusted_mode->hsync_end = fixed_mode->hsync_end;
  44         adjusted_mode->htotal = fixed_mode->htotal;
  45
  46         adjusted_mode->vdisplay = fixed_mode->vdisplay;
  47         adjusted_mode->vsync_start = fixed_mode->vsync_start;
  48         adjusted_mode->vsync_end = fixed_mode->vsync_end;
  49         adjusted_mode->vtotal = fixed_mode->vtotal;
  50
  51         adjusted_mode->clock = fixed_mode->clock;
  52 }
  53
  54 /* adjusted_mode has been preset to be the panel's fixed mode */
  55 void
  56 intel_pch_panel_fitting(struct drm_device *dev,
  57                         int fitting_mode,
  58                         const struct drm_display_mode *mode,
  59                         struct drm_display_mode *adjusted_mode)
  60 {
  61         struct drm_i915_private *dev_priv = dev->dev_private;
  62         int x, y, width, height;
  63
  64         x = y = width = height = 0;
  65
  66         /* Native modes don't need fitting */
  67         if (adjusted_mode->hdisplay == mode->hdisplay &&
  68             adjusted_mode->vdisplay == mode->vdisplay)
  69                 goto done;
  70
  71         switch (fitting_mode) {
  72         case DRM_MODE_SCALE_CENTER:
  73                 width = mode->hdisplay;
  74                 height = mode->vdisplay;
  75                 x = (adjusted_mode->hdisplay - width + 1)/2;
  76                 y = (adjusted_mode->vdisplay - height + 1)/2;
  77                 break;
  78
  79         case DRM_MODE_SCALE_ASPECT:
  80                 /* Scale but preserve the aspect ratio */
  81                 {
  82                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
  83                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
  84                         if (scaled_width > scaled_height) { /* pillar */
  85                                 width = scaled_height / mode->vdisplay;
  86                                 if (width & 1)
  87                                         width++;
  88                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
  89                                 y = 0;
  90                                 height = adjusted_mode->vdisplay;
  91                         } else if (scaled_width < scaled_height) { /* letter */
  92                                 height = scaled_width / mode->hdisplay;
  93                                 if (height & 1)
  94                                         height++;
  95                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
  96                                 x = 0;
  97                                 width = adjusted_mode->hdisplay;
  98                         } else {
  99                                 x = y = 0;
 100                                 width = adjusted_mode->hdisplay;
 101                                 height = adjusted_mode->vdisplay;
 102                         }
 103                 }
 104                 break;
 105
 106         default:
 107         case DRM_MODE_SCALE_FULLSCREEN:
 108                 x = y = 0;
 109                 width = adjusted_mode->hdisplay;
 110                 height = adjusted_mode->vdisplay;
 111                 break;
 112         }
 113
 114 done:
 115         dev_priv->pch_pf_pos = (x << 16) | y;
 116         dev_priv->pch_pf_size = (width << 16) | height;
 117 }
 118
 119 static int is_backlight_combination_mode(struct drm_device *dev)
 120 {
 121         struct drm_i915_private *dev_priv = dev->dev_private;
 122
 123         if (INTEL_INFO(dev)->gen >= 4)
 124                 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
 125
 126         if (IS_GEN2(dev))
 127                 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
 128
 129         return 0;
 130 }
 131
 132 static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
 133 {
 134         struct drm_i915_private *dev_priv = dev->dev_private;
 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->regfile.saveBLC_PWM_CTL2 == 0) {
 142                         dev_priv->regfile.saveBLC_PWM_CTL2 = val;
 143                 } else if (val == 0) {
 144                         val = dev_priv->regfile.saveBLC_PWM_CTL2;
 145                         I915_WRITE(BLC_PWM_PCH_CTL2, val);
 146                 }
 147         } else {
 148                 val = I915_READ(BLC_PWM_CTL);
 149                 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
 150                         dev_priv->regfile.saveBLC_PWM_CTL = val;
 151                         if (INTEL_INFO(dev)->gen >= 4)
 152                                 dev_priv->regfile.saveBLC_PWM_CTL2 =
 153                                         I915_READ(BLC_PWM_CTL2);
 154                 } else if (val == 0) {
 155                         val = dev_priv->regfile.saveBLC_PWM_CTL;
 156                         I915_WRITE(BLC_PWM_CTL, val);
 157                         if (INTEL_INFO(dev)->gen >= 4)
 158                                 I915_WRITE(BLC_PWM_CTL2,
 159                                            dev_priv->regfile.saveBLC_PWM_CTL2);
 160                 }
 161         }
 162
 163         return val;
 164 }
 165
 166 static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
 167 {
 168         u32 max;
 169
 170         max = i915_read_blc_pwm_ctl(dev);
 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 #if 0
 197                 pr_warn_once("fixme: max PWM is zero\n");
 198 #endif
 199                 return 1;
 200         }
 201
 202         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 203         return max;
 204 }
 205
 206 static u32 intel_panel_get_backlight(struct drm_device *dev)
 207 {
 208         struct drm_i915_private *dev_priv = dev->dev_private;
 209         u32 val;
 210
 211         if (HAS_PCH_SPLIT(dev)) {
 212                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 213         } else {
 214                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 215                 if (INTEL_INFO(dev)->gen < 4)
 216                         val >>= 1;
 217
 218                 if (is_backlight_combination_mode(dev)) {
 219                         u8 lbpc;
 220
 221                         lbpc = pci_read_config(dev->dev, PCI_LBPC, 1);
 222                         val *= lbpc;
 223                 }
 224         }
 225
 226         DRM_DEBUG("get backlight PWM = %d\n", val);
 227         return val;
 228 }
 229
 230 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 231 {
 232         struct drm_i915_private *dev_priv = dev->dev_private;
 233         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 234         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 235 }
 236
 237 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 238 {
 239         struct drm_i915_private *dev_priv = dev->dev_private;
 240         u32 tmp;
 241
 242         DRM_DEBUG("set backlight PWM = %d\n", level);
 243
 244         if (HAS_PCH_SPLIT(dev))
 245                 return intel_pch_panel_set_backlight(dev, level);
 246
 247         if (is_backlight_combination_mode(dev)) {
 248                 u32 max = intel_panel_get_max_backlight(dev);
 249                 u8 lbpc;
 250
 251                 lbpc = level * 0xfe / max + 1;
 252                 level /= lbpc;
 253                 pci_write_config(dev->dev, PCI_LBPC, lbpc, 4);
 254         }
 255
 256         tmp = I915_READ(BLC_PWM_CTL);
 257         if (INTEL_INFO(dev)->gen < 4)
 258                 level <<= 1;
 259         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 260         I915_WRITE(BLC_PWM_CTL, tmp | level);
 261 }
 262
 263 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 264 {
 265         struct drm_i915_private *dev_priv = dev->dev_private;
 266
 267         dev_priv->backlight_level = level;
 268         if (dev_priv->backlight_enabled)
 269                 intel_panel_actually_set_backlight(dev, level);
 270 }
 271
 272 void intel_panel_disable_backlight(struct drm_device *dev)
 273 {
 274         struct drm_i915_private *dev_priv = dev->dev_private;
 275
 276         dev_priv->backlight_enabled = false;
 277         intel_panel_actually_set_backlight(dev, 0);
 278
 279         if (INTEL_INFO(dev)->gen >= 4) {
 280                 uint32_t reg;
 281
 282                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 283
 284                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 285         }
 286 }
 287
 288 void intel_panel_enable_backlight(struct drm_device *dev,
 289                                   enum i915_pipe pipe)
 290 {
 291         struct drm_i915_private *dev_priv = dev->dev_private;
 292
 293         if (dev_priv->backlight_level == 0)
 294                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 295
 296         if (INTEL_INFO(dev)->gen >= 4) {
 297                 uint32_t reg, tmp;
 298
 299                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 300
 301
 302                 tmp = I915_READ(reg);
 303
 304                 /* Note that this can also get called through dpms changes. And
 305                  * we don't track the backlight dpms state, hence check whether
 306                  * we have to do anything first. */
 307                 if (tmp & BLM_PWM_ENABLE)
 308                         goto set_level;
 309
 310                 if (dev_priv->num_pipe == 3)
 311                         tmp &= ~BLM_PIPE_SELECT_IVB;
 312                 else
 313                         tmp &= ~BLM_PIPE_SELECT;
 314
 315                 tmp |= BLM_PIPE(pipe);
 316                 tmp &= ~BLM_PWM_ENABLE;
 317
 318                 I915_WRITE(reg, tmp);
 319                 POSTING_READ(reg);
 320                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
 321
 322                 if (HAS_PCH_SPLIT(dev)) {
 323                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 324                         tmp |= BLM_PCH_PWM_ENABLE;
 325                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 326                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 327                 }
 328         }
 329
 330 set_level:
 331         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 332          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 333          * registers are set.
 334          */
 335         dev_priv->backlight_enabled = true;
 336         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 337 }
 338
 339 static void intel_panel_init_backlight(struct drm_device *dev)
 340 {
 341         struct drm_i915_private *dev_priv = dev->dev_private;
 342
 343         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 344         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 345 }
 346
 347 enum drm_connector_status
 348 intel_panel_detect(struct drm_device *dev)
 349 {
 350 #if 0
 351         struct drm_i915_private *dev_priv = dev->dev_private;
 352 #endif
 353
 354         if (i915_panel_ignore_lid)
 355                 return i915_panel_ignore_lid > 0 ?
 356                         connector_status_connected :
 357                         connector_status_disconnected;
 358
 359         /* opregion lid state on HP 2540p is wrong at boot up,
 360          * appears to be either the BIOS or Linux ACPI fault */
 361 #if 0
 362         /* Assume that the BIOS does not lie through the OpRegion... */
 363         if (dev_priv->opregion.lid_state)
 364                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 365                         connector_status_connected :
 366                         connector_status_disconnected;
 367 #endif
 368
 369         return connector_status_unknown;
 370 }
 371
 372 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 373 static int intel_panel_update_status(struct backlight_device *bd)
 374 {
 375         struct drm_device *dev = bl_get_data(bd);
 376         intel_panel_set_backlight(dev, bd->props.brightness);
 377         return 0;
 378 }
 379
 380 static int intel_panel_get_brightness(struct backlight_device *bd)
 381 {
 382         struct drm_device *dev = bl_get_data(bd);
 383         struct drm_i915_private *dev_priv = dev->dev_private;
 384         return dev_priv->backlight_level;
 385 }
 386
 387 static const struct backlight_ops intel_panel_bl_ops = {
 388         .update_status = intel_panel_update_status,
 389         .get_brightness = intel_panel_get_brightness,
 390 };
 391
 392 int intel_panel_setup_backlight(struct drm_connector *connector)
 393 {
 394         struct drm_device *dev = connector->dev;
 395         struct drm_i915_private *dev_priv = dev->dev_private;
 396         struct backlight_properties props;
 397
 398         intel_panel_init_backlight(dev);
 399
 400         if (WARN_ON(dev_priv->backlight))
 401                 return -ENODEV;
 402
 403         memset(&props, 0, sizeof(props));
 404         props.type = BACKLIGHT_RAW;
 405         props.max_brightness = _intel_panel_get_max_backlight(dev);
 406         if (props.max_brightness == 0) {
 407                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
 408                 return -ENODEV;
 409         }
 410         dev_priv->backlight =
 411                 backlight_device_register("intel_backlight",
 412                                           &connector->kdev, dev,
 413                                           &intel_panel_bl_ops, &props);
 414
 415         if (IS_ERR(dev_priv->backlight)) {
 416                 DRM_ERROR("Failed to register backlight: %ld\n",
 417                           PTR_ERR(dev_priv->backlight));
 418                 dev_priv->backlight = NULL;
 419                 return -ENODEV;
 420         }
 421         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 422         return 0;
 423 }
 424
 425 void intel_panel_destroy_backlight(struct drm_device *dev)
 426 {
 427         struct drm_i915_private *dev_priv = dev->dev_private;
 428         if (dev_priv->backlight) {
 429                 backlight_device_unregister(dev_priv->backlight);
 430                 dev_priv->backlight = NULL;
 431         }
 432 }
 433 #else
 434 int intel_panel_setup_backlight(struct drm_connector *connector)
 435 {
 436         intel_panel_init_backlight(connector->dev);
 437         return 0;
 438 }
 439
 440 void intel_panel_destroy_backlight(struct drm_device *dev)
 441 {
 442         return;
 443 }
 444 #endif
 445
 446 int intel_panel_init(struct intel_panel *panel,
 447                      struct drm_display_mode *fixed_mode)
 448 {
 449         panel->fixed_mode = fixed_mode;
 450
 451         return 0;
 452 }
 453
 454 void intel_panel_fini(struct intel_panel *panel)
 455 {
 456         struct intel_connector *intel_connector =
 457                 container_of(panel, struct intel_connector, panel);
 458
 459         if (panel->fixed_mode)
 460                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 461 }