drivers/gpu/drm/i915/i915_opregion.c

   1 /*
   2  * Copyright 2008 Intel Corporation <hong.liu@intel.com>
   3  * Copyright 2008 Red Hat <mjg@redhat.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  * NON-INFRINGEMENT.  IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  22  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  *
  26  */
  27
  28 #include <linux/acpi.h>
  29 #include <acpi/video.h>
  30
  31 #include "drmP.h"
  32 #include "i915_drm.h"
  33 #include "i915_drv.h"
  34
  35 #define PCI_ASLE 0xe4
  36 #define PCI_LBPC 0xf4
  37 #define PCI_ASLS 0xfc
  38
  39 #define OPREGION_SZ            (8*1024)
  40 #define OPREGION_HEADER_OFFSET 0
  41 #define OPREGION_ACPI_OFFSET   0x100
  42 #define OPREGION_SWSCI_OFFSET  0x200
  43 #define OPREGION_ASLE_OFFSET   0x300
  44 #define OPREGION_VBT_OFFSET    0x1000
  45
  46 #define OPREGION_SIGNATURE "IntelGraphicsMem"
  47 #define MBOX_ACPI      (1<<0)
  48 #define MBOX_SWSCI     (1<<1)
  49 #define MBOX_ASLE      (1<<2)
  50
  51 struct opregion_header {
  52        u8 signature[16];
  53        u32 size;
  54        u32 opregion_ver;
  55        u8 bios_ver[32];
  56        u8 vbios_ver[16];
  57        u8 driver_ver[16];
  58        u32 mboxes;
  59        u8 reserved[164];
  60 } __attribute__((packed));
  61
  62 /* OpRegion mailbox #1: public ACPI methods */
  63 struct opregion_acpi {
  64        u32 drdy;       /* driver readiness */
  65        u32 csts;       /* notification status */
  66        u32 cevt;       /* current event */
  67        u8 rsvd1[20];
  68        u32 didl[8];    /* supported display devices ID list */
  69        u32 cpdl[8];    /* currently presented display list */
  70        u32 cadl[8];    /* currently active display list */
  71        u32 nadl[8];    /* next active devices list */
  72        u32 aslp;       /* ASL sleep time-out */
  73        u32 tidx;       /* toggle table index */
  74        u32 chpd;       /* current hotplug enable indicator */
  75        u32 clid;       /* current lid state*/
  76        u32 cdck;       /* current docking state */
  77        u32 sxsw;       /* Sx state resume */
  78        u32 evts;       /* ASL supported events */
  79        u32 cnot;       /* current OS notification */
  80        u32 nrdy;       /* driver status */
  81        u8 rsvd2[60];
  82 } __attribute__((packed));
  83
  84 /* OpRegion mailbox #2: SWSCI */
  85 struct opregion_swsci {
  86        u32 scic;       /* SWSCI command|status|data */
  87        u32 parm;       /* command parameters */
  88        u32 dslp;       /* driver sleep time-out */
  89        u8 rsvd[244];
  90 } __attribute__((packed));
  91
  92 /* OpRegion mailbox #3: ASLE */
  93 struct opregion_asle {
  94        u32 ardy;       /* driver readiness */
  95        u32 aslc;       /* ASLE interrupt command */
  96        u32 tche;       /* technology enabled indicator */
  97        u32 alsi;       /* current ALS illuminance reading */
  98        u32 bclp;       /* backlight brightness to set */
  99        u32 pfit;       /* panel fitting state */
 100        u32 cblv;       /* current brightness level */
 101        u16 bclm[20];   /* backlight level duty cycle mapping table */
 102        u32 cpfm;       /* current panel fitting mode */
 103        u32 epfm;       /* enabled panel fitting modes */
 104        u8 plut[74];    /* panel LUT and identifier */
 105        u32 pfmb;       /* PWM freq and min brightness */
 106        u8 rsvd[102];
 107 } __attribute__((packed));
 108
 109 /* ASLE irq request bits */
 110 #define ASLE_SET_ALS_ILLUM     (1 << 0)
 111 #define ASLE_SET_BACKLIGHT     (1 << 1)
 112 #define ASLE_SET_PFIT          (1 << 2)
 113 #define ASLE_SET_PWM_FREQ      (1 << 3)
 114 #define ASLE_REQ_MSK           0xf
 115
 116 /* response bits of ASLE irq request */
 117 #define ASLE_ALS_ILLUM_FAILED   (1<<10)
 118 #define ASLE_BACKLIGHT_FAILED   (1<<12)
 119 #define ASLE_PFIT_FAILED        (1<<14)
 120 #define ASLE_PWM_FREQ_FAILED    (1<<16)
 121
 122 /* ASLE backlight brightness to set */
 123 #define ASLE_BCLP_VALID                (1<<31)
 124 #define ASLE_BCLP_MSK          (~(1<<31))
 125
 126 /* ASLE panel fitting request */
 127 #define ASLE_PFIT_VALID         (1<<31)
 128 #define ASLE_PFIT_CENTER (1<<0)
 129 #define ASLE_PFIT_STRETCH_TEXT (1<<1)
 130 #define ASLE_PFIT_STRETCH_GFX (1<<2)
 131
 132 /* PWM frequency and minimum brightness */
 133 #define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
 134 #define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
 135 #define ASLE_PFMB_PWM_MASK (0x7ffffe00)
 136 #define ASLE_PFMB_PWM_VALID (1<<31)
 137
 138 #define ASLE_CBLV_VALID         (1<<31)
 139
 140 #define ACPI_OTHER_OUTPUT (0<<8)
 141 #define ACPI_VGA_OUTPUT (1<<8)
 142 #define ACPI_TV_OUTPUT (2<<8)
 143 #define ACPI_DIGITAL_OUTPUT (3<<8)
 144 #define ACPI_LVDS_OUTPUT (4<<8)
 145
 146 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 147 {
 148         struct drm_i915_private *dev_priv = dev->dev_private;
 149         struct opregion_asle *asle = dev_priv->opregion.asle;
 150         u32 blc_pwm_ctl, blc_pwm_ctl2;
 151         u32 max_backlight, level, shift;
 152
 153         if (!(bclp & ASLE_BCLP_VALID))
 154                 return ASLE_BACKLIGHT_FAILED;
 155
 156         bclp &= ASLE_BCLP_MSK;
 157         if (bclp < 0 || bclp > 255)
 158                 return ASLE_BACKLIGHT_FAILED;
 159
 160         blc_pwm_ctl = I915_READ(BLC_PWM_CTL);
 161         blc_pwm_ctl2 = I915_READ(BLC_PWM_CTL2);
 162
 163         if (IS_I965G(dev) && (blc_pwm_ctl2 & BLM_COMBINATION_MODE))
 164                 pci_write_config_dword(dev->pdev, PCI_LBPC, bclp);
 165         else {
 166                 if (IS_PINEVIEW(dev)) {
 167                         blc_pwm_ctl &= ~(BACKLIGHT_DUTY_CYCLE_MASK - 1);
 168                         max_backlight = (blc_pwm_ctl & BACKLIGHT_MODULATION_FREQ_MASK) >>
 169                                         BACKLIGHT_MODULATION_FREQ_SHIFT;
 170                         shift = BACKLIGHT_DUTY_CYCLE_SHIFT + 1;
 171                 } else {
 172                         blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 173                         max_backlight = ((blc_pwm_ctl & BACKLIGHT_MODULATION_FREQ_MASK) >>
 174                                         BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 175                         shift = BACKLIGHT_DUTY_CYCLE_SHIFT;
 176                 }
 177                 level = (bclp * max_backlight) / 255;
 178                 I915_WRITE(BLC_PWM_CTL, blc_pwm_ctl | (level << shift));
 179         }
 180         asle->cblv = (bclp*0x64)/0xff | ASLE_CBLV_VALID;
 181
 182         return 0;
 183 }
 184
 185 static u32 asle_set_als_illum(struct drm_device *dev, u32 alsi)
 186 {
 187         /* alsi is the current ALS reading in lux. 0 indicates below sensor
 188            range, 0xffff indicates above sensor range. 1-0xfffe are valid */
 189         return 0;
 190 }
 191
 192 static u32 asle_set_pwm_freq(struct drm_device *dev, u32 pfmb)
 193 {
 194         struct drm_i915_private *dev_priv = dev->dev_private;
 195         if (pfmb & ASLE_PFMB_PWM_VALID) {
 196                 u32 blc_pwm_ctl = I915_READ(BLC_PWM_CTL);
 197                 u32 pwm = pfmb & ASLE_PFMB_PWM_MASK;
 198                 blc_pwm_ctl &= BACKLIGHT_DUTY_CYCLE_MASK;
 199                 pwm = pwm >> 9;
 200                 /* FIXME - what do we do with the PWM? */
 201         }
 202         return 0;
 203 }
 204
 205 static u32 asle_set_pfit(struct drm_device *dev, u32 pfit)
 206 {
 207         /* Panel fitting is currently controlled by the X code, so this is a
 208            noop until modesetting support works fully */
 209         if (!(pfit & ASLE_PFIT_VALID))
 210                 return ASLE_PFIT_FAILED;
 211         return 0;
 212 }
 213
 214 void opregion_asle_intr(struct drm_device *dev)
 215 {
 216         struct drm_i915_private *dev_priv = dev->dev_private;
 217         struct opregion_asle *asle = dev_priv->opregion.asle;
 218         u32 asle_stat = 0;
 219         u32 asle_req;
 220
 221         if (!asle)
 222                 return;
 223
 224         asle_req = asle->aslc & ASLE_REQ_MSK;
 225
 226         if (!asle_req) {
 227                 DRM_DEBUG_DRIVER("non asle set request??\n");
 228                 return;
 229         }
 230
 231         if (asle_req & ASLE_SET_ALS_ILLUM)
 232                 asle_stat |= asle_set_als_illum(dev, asle->alsi);
 233
 234         if (asle_req & ASLE_SET_BACKLIGHT)
 235                 asle_stat |= asle_set_backlight(dev, asle->bclp);
 236
 237         if (asle_req & ASLE_SET_PFIT)
 238                 asle_stat |= asle_set_pfit(dev, asle->pfit);
 239
 240         if (asle_req & ASLE_SET_PWM_FREQ)
 241                 asle_stat |= asle_set_pwm_freq(dev, asle->pfmb);
 242
 243         asle->aslc = asle_stat;
 244 }
 245
 246 static u32 asle_set_backlight_ironlake(struct drm_device *dev, u32 bclp)
 247 {
 248         struct drm_i915_private *dev_priv = dev->dev_private;
 249         struct opregion_asle *asle = dev_priv->opregion.asle;
 250         u32 cpu_pwm_ctl, pch_pwm_ctl2;
 251         u32 max_backlight, level;
 252
 253         if (!(bclp & ASLE_BCLP_VALID))
 254                 return ASLE_BACKLIGHT_FAILED;
 255
 256         bclp &= ASLE_BCLP_MSK;
 257         if (bclp < 0 || bclp > 255)
 258                 return ASLE_BACKLIGHT_FAILED;
 259
 260         cpu_pwm_ctl = I915_READ(BLC_PWM_CPU_CTL);
 261         pch_pwm_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
 262         /* get the max PWM frequency */
 263         max_backlight = (pch_pwm_ctl2 >> 16) & BACKLIGHT_DUTY_CYCLE_MASK;
 264         /* calculate the expected PMW frequency */
 265         level = (bclp * max_backlight) / 255;
 266         /* reserve the high 16 bits */
 267         cpu_pwm_ctl &= ~(BACKLIGHT_DUTY_CYCLE_MASK);
 268         /* write the updated PWM frequency */
 269         I915_WRITE(BLC_PWM_CPU_CTL, cpu_pwm_ctl | level);
 270
 271         asle->cblv = (bclp*0x64)/0xff | ASLE_CBLV_VALID;
 272
 273         return 0;
 274 }
 275
 276 void ironlake_opregion_gse_intr(struct drm_device *dev)
 277 {
 278         struct drm_i915_private *dev_priv = dev->dev_private;
 279         struct opregion_asle *asle = dev_priv->opregion.asle;
 280         u32 asle_stat = 0;
 281         u32 asle_req;
 282
 283         if (!asle)
 284                 return;
 285
 286         asle_req = asle->aslc & ASLE_REQ_MSK;
 287
 288         if (!asle_req) {
 289                 DRM_DEBUG_DRIVER("non asle set request??\n");
 290                 return;
 291         }
 292
 293         if (asle_req & ASLE_SET_ALS_ILLUM) {
 294                 DRM_DEBUG_DRIVER("Illum is not supported\n");
 295                 asle_stat |= ASLE_ALS_ILLUM_FAILED;
 296         }
 297
 298         if (asle_req & ASLE_SET_BACKLIGHT)
 299                 asle_stat |= asle_set_backlight_ironlake(dev, asle->bclp);
 300
 301         if (asle_req & ASLE_SET_PFIT) {
 302                 DRM_DEBUG_DRIVER("Pfit is not supported\n");
 303                 asle_stat |= ASLE_PFIT_FAILED;
 304         }
 305
 306         if (asle_req & ASLE_SET_PWM_FREQ) {
 307                 DRM_DEBUG_DRIVER("PWM freq is not supported\n");
 308                 asle_stat |= ASLE_PWM_FREQ_FAILED;
 309         }
 310
 311         asle->aslc = asle_stat;
 312 }
 313 #define ASLE_ALS_EN    (1<<0)
 314 #define ASLE_BLC_EN    (1<<1)
 315 #define ASLE_PFIT_EN   (1<<2)
 316 #define ASLE_PFMB_EN   (1<<3)
 317
 318 void opregion_enable_asle(struct drm_device *dev)
 319 {
 320         struct drm_i915_private *dev_priv = dev->dev_private;
 321         struct opregion_asle *asle = dev_priv->opregion.asle;
 322
 323         if (asle) {
 324                 if (IS_MOBILE(dev)) {
 325                         unsigned long irqflags;
 326
 327                         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 328                         intel_enable_asle(dev);
 329                         spin_unlock_irqrestore(&dev_priv->user_irq_lock,
 330                                                irqflags);
 331                 }
 332
 333                 asle->tche = ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN |
 334                         ASLE_PFMB_EN;
 335                 asle->ardy = 1;
 336         }
 337 }
 338
 339 #define ACPI_EV_DISPLAY_SWITCH (1<<0)
 340 #define ACPI_EV_LID            (1<<1)
 341 #define ACPI_EV_DOCK           (1<<2)
 342
 343 static struct intel_opregion *system_opregion;
 344
 345 static int intel_opregion_video_event(struct notifier_block *nb,
 346                                       unsigned long val, void *data)
 347 {
 348         /* The only video events relevant to opregion are 0x80. These indicate
 349            either a docking event, lid switch or display switch request. In
 350            Linux, these are handled by the dock, button and video drivers.
 351            We might want to fix the video driver to be opregion-aware in
 352            future, but right now we just indicate to the firmware that the
 353            request has been handled */
 354
 355         struct opregion_acpi *acpi;
 356
 357         if (!system_opregion)
 358                 return NOTIFY_DONE;
 359
 360         acpi = system_opregion->acpi;
 361         acpi->csts = 0;
 362
 363         return NOTIFY_OK;
 364 }
 365
 366 static struct notifier_block intel_opregion_notifier = {
 367         .notifier_call = intel_opregion_video_event,
 368 };
 369
 370 /*
 371  * Initialise the DIDL field in opregion. This passes a list of devices to
 372  * the firmware. Values are defined by section B.4.2 of the ACPI specification
 373  * (version 3)
 374  */
 375
 376 static void intel_didl_outputs(struct drm_device *dev)
 377 {
 378         struct drm_i915_private *dev_priv = dev->dev_private;
 379         struct intel_opregion *opregion = &dev_priv->opregion;
 380         struct drm_connector *connector;
 381         acpi_handle handle;
 382         struct acpi_device *acpi_dev, *acpi_cdev, *acpi_video_bus = NULL;
 383         unsigned long long device_id;
 384         acpi_status status;
 385         int i = 0;
 386
 387         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 388         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev)))
 389                 return;
 390
 391         if (acpi_is_video_device(acpi_dev))
 392                 acpi_video_bus = acpi_dev;
 393         else {
 394                 list_for_each_entry(acpi_cdev, &acpi_dev->children, node) {
 395                         if (acpi_is_video_device(acpi_cdev)) {
 396                                 acpi_video_bus = acpi_cdev;
 397                                 break;
 398                         }
 399                 }
 400         }
 401
 402         if (!acpi_video_bus) {
 403                 printk(KERN_WARNING "No ACPI video bus found\n");
 404                 return;
 405         }
 406
 407         list_for_each_entry(acpi_cdev, &acpi_video_bus->children, node) {
 408                 if (i >= 8) {
 409                         dev_printk (KERN_ERR, &dev->pdev->dev,
 410                                     "More than 8 outputs detected\n");
 411                         return;
 412                 }
 413                 status =
 414                         acpi_evaluate_integer(acpi_cdev->handle, "_ADR",
 415                                                 NULL, &device_id);
 416                 if (ACPI_SUCCESS(status)) {
 417                         if (!device_id)
 418                                 goto blind_set;
 419                         opregion->acpi->didl[i] = (u32)(device_id & 0x0f0f);
 420                         i++;
 421                 }
 422         }
 423
 424 end:
 425         /* If fewer than 8 outputs, the list must be null terminated */
 426         if (i < 8)
 427                 opregion->acpi->didl[i] = 0;
 428         return;
 429
 430 blind_set:
 431         i = 0;
 432         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 433                 int output_type = ACPI_OTHER_OUTPUT;
 434                 if (i >= 8) {
 435                         dev_printk (KERN_ERR, &dev->pdev->dev,
 436                                     "More than 8 outputs detected\n");
 437                         return;
 438                 }
 439                 switch (connector->connector_type) {
 440                 case DRM_MODE_CONNECTOR_VGA:
 441                 case DRM_MODE_CONNECTOR_DVIA:
 442                         output_type = ACPI_VGA_OUTPUT;
 443                         break;
 444                 case DRM_MODE_CONNECTOR_Composite:
 445                 case DRM_MODE_CONNECTOR_SVIDEO:
 446                 case DRM_MODE_CONNECTOR_Component:
 447                 case DRM_MODE_CONNECTOR_9PinDIN:
 448                         output_type = ACPI_TV_OUTPUT;
 449                         break;
 450                 case DRM_MODE_CONNECTOR_DVII:
 451                 case DRM_MODE_CONNECTOR_DVID:
 452                 case DRM_MODE_CONNECTOR_DisplayPort:
 453                 case DRM_MODE_CONNECTOR_HDMIA:
 454                 case DRM_MODE_CONNECTOR_HDMIB:
 455                         output_type = ACPI_DIGITAL_OUTPUT;
 456                         break;
 457                 case DRM_MODE_CONNECTOR_LVDS:
 458                         output_type = ACPI_LVDS_OUTPUT;
 459                         break;
 460                 }
 461                 opregion->acpi->didl[i] |= (1<<31) | output_type | i;
 462                 i++;
 463         }
 464         goto end;
 465 }
 466
 467 int intel_opregion_init(struct drm_device *dev, int resume)
 468 {
 469         struct drm_i915_private *dev_priv = dev->dev_private;
 470         struct intel_opregion *opregion = &dev_priv->opregion;
 471         void *base;
 472         u32 asls, mboxes;
 473         int err = 0;
 474
 475         pci_read_config_dword(dev->pdev, PCI_ASLS, &asls);
 476         DRM_DEBUG_DRIVER("graphic opregion physical addr: 0x%x\n", asls);
 477         if (asls == 0) {
 478                 DRM_DEBUG_DRIVER("ACPI OpRegion not supported!\n");
 479                 return -ENOTSUPP;
 480         }
 481
 482         base = ioremap(asls, OPREGION_SZ);
 483         if (!base)
 484                 return -ENOMEM;
 485
 486         opregion->header = base;
 487         if (memcmp(opregion->header->signature, OPREGION_SIGNATURE, 16)) {
 488                 DRM_DEBUG_DRIVER("opregion signature mismatch\n");
 489                 err = -EINVAL;
 490                 goto err_out;
 491         }
 492
 493         mboxes = opregion->header->mboxes;
 494         if (mboxes & MBOX_ACPI) {
 495                 DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
 496                 opregion->acpi = base + OPREGION_ACPI_OFFSET;
 497                 if (drm_core_check_feature(dev, DRIVER_MODESET))
 498                         intel_didl_outputs(dev);
 499         } else {
 500                 DRM_DEBUG_DRIVER("Public ACPI methods not supported\n");
 501                 err = -ENOTSUPP;
 502                 goto err_out;
 503         }
 504         opregion->enabled = 1;
 505
 506         if (mboxes & MBOX_SWSCI) {
 507                 DRM_DEBUG_DRIVER("SWSCI supported\n");
 508                 opregion->swsci = base + OPREGION_SWSCI_OFFSET;
 509         }
 510         if (mboxes & MBOX_ASLE) {
 511                 DRM_DEBUG_DRIVER("ASLE supported\n");
 512                 opregion->asle = base + OPREGION_ASLE_OFFSET;
 513                 opregion_enable_asle(dev);
 514         }
 515
 516         if (!resume)
 517                 acpi_video_register();
 518
 519
 520         /* Notify BIOS we are ready to handle ACPI video ext notifs.
 521          * Right now, all the events are handled by the ACPI video module.
 522          * We don't actually need to do anything with them. */
 523         opregion->acpi->csts = 0;
 524         opregion->acpi->drdy = 1;
 525
 526         system_opregion = opregion;
 527         register_acpi_notifier(&intel_opregion_notifier);
 528
 529         return 0;
 530
 531 err_out:
 532         iounmap(opregion->header);
 533         opregion->header = NULL;
 534         acpi_video_register();
 535         return err;
 536 }
 537
 538 void intel_opregion_free(struct drm_device *dev, int suspend)
 539 {
 540         struct drm_i915_private *dev_priv = dev->dev_private;
 541         struct intel_opregion *opregion = &dev_priv->opregion;
 542
 543         if (!opregion->enabled)
 544                 return;
 545
 546         if (!suspend)
 547                 acpi_video_unregister();
 548
 549         opregion->acpi->drdy = 0;
 550
 551         system_opregion = NULL;
 552         unregister_acpi_notifier(&intel_opregion_notifier);
 553
 554         /* just clear all opregion memory pointers now */
 555         iounmap(opregion->header);
 556         opregion->header = NULL;
 557         opregion->acpi = NULL;
 558         opregion->swsci = NULL;
 559         opregion->asle = NULL;
 560
 561         opregion->enabled = 0;
 562 }