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 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         if (max == 0) {
 172                 /* XXX add code here to query mode clock or hardware clock
 173                  * and program max PWM appropriately.
 174                  */
 175                 pr_warn_once("fixme: max PWM is zero\n");
 176                 return 1;
 177         }
 178
 179         if (HAS_PCH_SPLIT(dev)) {
 180                 max >>= 16;
 181         } else {
 182                 if (INTEL_INFO(dev)->gen < 4)
 183                         max >>= 17;
 184                 else
 185                         max >>= 16;
 186
 187                 if (is_backlight_combination_mode(dev))
 188                         max *= 0xff;
 189         }
 190
 191         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 192         return max;
 193 }
 194
 195 static int i915_panel_invert_brightness;
 196 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 197         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 198         "report PCI device ID, subsystem vendor and subsystem device ID "
 199         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 200         "It will then be included in an upcoming module version.");
 201 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 202 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 203 {
 204         struct drm_i915_private *dev_priv = dev->dev_private;
 205
 206         if (i915_panel_invert_brightness < 0)
 207                 return val;
 208
 209         if (i915_panel_invert_brightness > 0 ||
 210             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
 211                 return intel_panel_get_max_backlight(dev) - val;
 212
 213         return val;
 214 }
 215
 216 static u32 intel_panel_get_backlight(struct drm_device *dev)
 217 {
 218         struct drm_i915_private *dev_priv = dev->dev_private;
 219         u32 val;
 220
 221         if (HAS_PCH_SPLIT(dev)) {
 222                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 223         } else {
 224                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 225                 if (INTEL_INFO(dev)->gen < 4)
 226                         val >>= 1;
 227
 228                 if (is_backlight_combination_mode(dev)) {
 229                         u8 lbpc;
 230
 231                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 232                         val *= lbpc;
 233                 }
 234         }
 235
 236         val = intel_panel_compute_brightness(dev, val);
 237         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 238         return val;
 239 }
 240
 241 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 242 {
 243         struct drm_i915_private *dev_priv = dev->dev_private;
 244         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 245         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 246 }
 247
 248 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 249 {
 250         struct drm_i915_private *dev_priv = dev->dev_private;
 251         u32 tmp;
 252
 253         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 254         level = intel_panel_compute_brightness(dev, level);
 255
 256         if (HAS_PCH_SPLIT(dev))
 257                 return intel_pch_panel_set_backlight(dev, level);
 258
 259         if (is_backlight_combination_mode(dev)) {
 260                 u32 max = intel_panel_get_max_backlight(dev);
 261                 u8 lbpc;
 262
 263                 lbpc = level * 0xfe / max + 1;
 264                 level /= lbpc;
 265                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 266         }
 267
 268         tmp = I915_READ(BLC_PWM_CTL);
 269         if (INTEL_INFO(dev)->gen < 4)
 270                 level <<= 1;
 271         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 272         I915_WRITE(BLC_PWM_CTL, tmp | level);
 273 }
 274
 275 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 276 {
 277         struct drm_i915_private *dev_priv = dev->dev_private;
 278
 279         dev_priv->backlight_level = level;
 280         if (dev_priv->backlight_enabled)
 281                 intel_panel_actually_set_backlight(dev, level);
 282 }
 283
 284 void intel_panel_disable_backlight(struct drm_device *dev)
 285 {
 286         struct drm_i915_private *dev_priv = dev->dev_private;
 287
 288         dev_priv->backlight_enabled = false;
 289         intel_panel_actually_set_backlight(dev, 0);
 290
 291         if (INTEL_INFO(dev)->gen >= 4) {
 292                 uint32_t reg, tmp;
 293
 294                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 295
 296                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
 297
 298                 if (HAS_PCH_SPLIT(dev)) {
 299                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 300                         tmp &= ~BLM_PCH_PWM_ENABLE;
 301                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 302                 }
 303         }
 304 }
 305
 306 void intel_panel_enable_backlight(struct drm_device *dev,
 307                                   enum pipe pipe)
 308 {
 309         struct drm_i915_private *dev_priv = dev->dev_private;
 310
 311         if (dev_priv->backlight_level == 0)
 312                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 313
 314         if (INTEL_INFO(dev)->gen >= 4) {
 315                 uint32_t reg, tmp;
 316
 317                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
 318
 319
 320                 tmp = I915_READ(reg);
 321
 322                 /* Note that this can also get called through dpms changes. And
 323                  * we don't track the backlight dpms state, hence check whether
 324                  * we have to do anything first. */
 325                 if (tmp & BLM_PWM_ENABLE)
 326                         goto set_level;
 327
 328                 if (dev_priv->num_pipe == 3)
 329                         tmp &= ~BLM_PIPE_SELECT_IVB;
 330                 else
 331                         tmp &= ~BLM_PIPE_SELECT;
 332
 333                 tmp |= BLM_PIPE(pipe);
 334                 tmp &= ~BLM_PWM_ENABLE;
 335
 336                 I915_WRITE(reg, tmp);
 337                 POSTING_READ(reg);
 338                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
 339
 340                 if (HAS_PCH_SPLIT(dev)) {
 341                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
 342                         tmp |= BLM_PCH_PWM_ENABLE;
 343                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
 344                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
 345                 }
 346         }
 347
 348 set_level:
 349         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
 350          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
 351          * registers are set.
 352          */
 353         dev_priv->backlight_enabled = true;
 354         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 355 }
 356
 357 static void intel_panel_init_backlight(struct drm_device *dev)
 358 {
 359         struct drm_i915_private *dev_priv = dev->dev_private;
 360
 361         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 362         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 363 }
 364
 365 enum drm_connector_status
 366 intel_panel_detect(struct drm_device *dev)
 367 {
 368 #if 0
 369         struct drm_i915_private *dev_priv = dev->dev_private;
 370 #endif
 371
 372         if (i915_panel_ignore_lid)
 373                 return i915_panel_ignore_lid > 0 ?
 374                         connector_status_connected :
 375                         connector_status_disconnected;
 376
 377         /* opregion lid state on HP 2540p is wrong at boot up,
 378          * appears to be either the BIOS or Linux ACPI fault */
 379 #if 0
 380         /* Assume that the BIOS does not lie through the OpRegion... */
 381         if (dev_priv->opregion.lid_state)
 382                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 383                         connector_status_connected :
 384                         connector_status_disconnected;
 385 #endif
 386
 387         return connector_status_unknown;
 388 }
 389
 390 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 391 static int intel_panel_update_status(struct backlight_device *bd)
 392 {
 393         struct drm_device *dev = bl_get_data(bd);
 394         intel_panel_set_backlight(dev, bd->props.brightness);
 395         return 0;
 396 }
 397
 398 static int intel_panel_get_brightness(struct backlight_device *bd)
 399 {
 400         struct drm_device *dev = bl_get_data(bd);
 401         struct drm_i915_private *dev_priv = dev->dev_private;
 402         return dev_priv->backlight_level;
 403 }
 404
 405 static const struct backlight_ops intel_panel_bl_ops = {
 406         .update_status = intel_panel_update_status,
 407         .get_brightness = intel_panel_get_brightness,
 408 };
 409
 410 int intel_panel_setup_backlight(struct drm_device *dev)
 411 {
 412         struct drm_i915_private *dev_priv = dev->dev_private;
 413         struct backlight_properties props;
 414         struct drm_connector *connector;
 415
 416         intel_panel_init_backlight(dev);
 417
 418         if (dev_priv->int_lvds_connector)
 419                 connector = dev_priv->int_lvds_connector;
 420         else if (dev_priv->int_edp_connector)
 421                 connector = dev_priv->int_edp_connector;
 422         else
 423                 return -ENODEV;
 424
 425         memset(&props, 0, sizeof(props));
 426         props.type = BACKLIGHT_RAW;
 427         props.max_brightness = intel_panel_get_max_backlight(dev);
 428         dev_priv->backlight =
 429                 backlight_device_register("intel_backlight",
 430                                           &connector->kdev, dev,
 431                                           &intel_panel_bl_ops, &props);
 432
 433         if (IS_ERR(dev_priv->backlight)) {
 434                 DRM_ERROR("Failed to register backlight: %ld\n",
 435                           PTR_ERR(dev_priv->backlight));
 436                 dev_priv->backlight = NULL;
 437                 return -ENODEV;
 438         }
 439         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 440         return 0;
 441 }
 442
 443 void intel_panel_destroy_backlight(struct drm_device *dev)
 444 {
 445         struct drm_i915_private *dev_priv = dev->dev_private;
 446         if (dev_priv->backlight)
 447                 backlight_device_unregister(dev_priv->backlight);
 448 }
 449 #else
 450 int intel_panel_setup_backlight(struct drm_device *dev)
 451 {
 452         intel_panel_init_backlight(dev);
 453         return 0;
 454 }
 455
 456 void intel_panel_destroy_backlight(struct drm_device *dev)
 457 {
 458         return;
 459 }
 460 #endif