SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/gpu/drm/i915/i915_irq.c

   1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
   2  */
   3 /*
   4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  */
  28
  29 #include <linux/sysrq.h>
  30 #include "drmP.h"
  31 #include "drm.h"
  32 #include "i915_drm.h"
  33 #include "i915_drv.h"
  34 #include "i915_trace.h"
  35 #include "intel_drv.h"
  36
  37 #define MAX_NOPID ((u32)~0)
  38
  39 /**
  40  * Interrupts that are always left unmasked.
  41  *
  42  * Since pipe events are edge-triggered from the PIPESTAT register to IIR,
  43  * we leave them always unmasked in IMR and then control enabling them through
  44  * PIPESTAT alone.
  45  */
  46 #define I915_INTERRUPT_ENABLE_FIX (I915_ASLE_INTERRUPT |                 \
  47                                    I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
  48                                    I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | \
  49                                    I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
  50
  51 /** Interrupts that we mask and unmask at runtime. */
  52 #define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT)
  53
  54 #define I915_PIPE_VBLANK_STATUS (PIPE_START_VBLANK_INTERRUPT_STATUS |\
  55                                  PIPE_VBLANK_INTERRUPT_STATUS)
  56
  57 #define I915_PIPE_VBLANK_ENABLE (PIPE_START_VBLANK_INTERRUPT_ENABLE |\
  58                                  PIPE_VBLANK_INTERRUPT_ENABLE)
  59
  60 #define DRM_I915_VBLANK_PIPE_ALL        (DRM_I915_VBLANK_PIPE_A | \
  61                                          DRM_I915_VBLANK_PIPE_B)
  62
  63 void
  64 igdng_enable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
  65 {
  66         if ((dev_priv->gt_irq_mask_reg & mask) != 0) {
  67                 dev_priv->gt_irq_mask_reg &= ~mask;
  68                 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
  69                 (void) I915_READ(GTIMR);
  70         }
  71 }
  72
  73 static inline void
  74 igdng_disable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
  75 {
  76         if ((dev_priv->gt_irq_mask_reg & mask) != mask) {
  77                 dev_priv->gt_irq_mask_reg |= mask;
  78                 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
  79                 (void) I915_READ(GTIMR);
  80         }
  81 }
  82
  83 /* For display hotplug interrupt */
  84 void
  85 igdng_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  86 {
  87         if ((dev_priv->irq_mask_reg & mask) != 0) {
  88                 dev_priv->irq_mask_reg &= ~mask;
  89                 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
  90                 (void) I915_READ(DEIMR);
  91         }
  92 }
  93
  94 static inline void
  95 igdng_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  96 {
  97         if ((dev_priv->irq_mask_reg & mask) != mask) {
  98                 dev_priv->irq_mask_reg |= mask;
  99                 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
 100                 (void) I915_READ(DEIMR);
 101         }
 102 }
 103
 104 void
 105 i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
 106 {
 107         if ((dev_priv->irq_mask_reg & mask) != 0) {
 108                 dev_priv->irq_mask_reg &= ~mask;
 109                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
 110                 (void) I915_READ(IMR);
 111         }
 112 }
 113
 114 static inline void
 115 i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
 116 {
 117         if ((dev_priv->irq_mask_reg & mask) != mask) {
 118                 dev_priv->irq_mask_reg |= mask;
 119                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
 120                 (void) I915_READ(IMR);
 121         }
 122 }
 123
 124 static inline u32
 125 i915_pipestat(int pipe)
 126 {
 127         if (pipe == 0)
 128                 return PIPEASTAT;
 129         if (pipe == 1)
 130                 return PIPEBSTAT;
 131         BUG();
 132 }
 133
 134 void
 135 i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
 136 {
 137         if ((dev_priv->pipestat[pipe] & mask) != mask) {
 138                 u32 reg = i915_pipestat(pipe);
 139
 140                 dev_priv->pipestat[pipe] |= mask;
 141                 /* Enable the interrupt, clear any pending status */
 142                 I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
 143                 (void) I915_READ(reg);
 144         }
 145 }
 146
 147 void
 148 i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
 149 {
 150         if ((dev_priv->pipestat[pipe] & mask) != 0) {
 151                 u32 reg = i915_pipestat(pipe);
 152
 153                 dev_priv->pipestat[pipe] &= ~mask;
 154                 I915_WRITE(reg, dev_priv->pipestat[pipe]);
 155                 (void) I915_READ(reg);
 156         }
 157 }
 158
 159 /**
 160  * i915_pipe_enabled - check if a pipe is enabled
 161  * @dev: DRM device
 162  * @pipe: pipe to check
 163  *
 164  * Reading certain registers when the pipe is disabled can hang the chip.
 165  * Use this routine to make sure the PLL is running and the pipe is active
 166  * before reading such registers if unsure.
 167  */
 168 static int
 169 i915_pipe_enabled(struct drm_device *dev, int pipe)
 170 {
 171         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 172         unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
 173
 174         if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
 175                 return 1;
 176
 177         return 0;
 178 }
 179
 180 /* Called from drm generic code, passed a 'crtc', which
 181  * we use as a pipe index
 182  */
 183 u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
 184 {
 185         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 186         unsigned long high_frame;
 187         unsigned long low_frame;
 188         u32 high1, high2, low, count;
 189
 190         high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
 191         low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
 192
 193         if (!i915_pipe_enabled(dev, pipe)) {
 194                 DRM_DEBUG("trying to get vblank count for disabled pipe %d\n", pipe);
 195                 return 0;
 196         }
 197
 198         /*
 199          * High & low register fields aren't synchronized, so make sure
 200          * we get a low value that's stable across two reads of the high
 201          * register.
 202          */
 203         do {
 204                 high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 205                          PIPE_FRAME_HIGH_SHIFT);
 206                 low =  ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
 207                         PIPE_FRAME_LOW_SHIFT);
 208                 high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 209                          PIPE_FRAME_HIGH_SHIFT);
 210         } while (high1 != high2);
 211
 212         count = (high1 << 8) | low;
 213
 214         return count;
 215 }
 216
 217 u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
 218 {
 219         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 220         int reg = pipe ? PIPEB_FRMCOUNT_GM45 : PIPEA_FRMCOUNT_GM45;
 221
 222         if (!i915_pipe_enabled(dev, pipe)) {
 223                 DRM_DEBUG("trying to get vblank count for disabled pipe %d\n", pipe);
 224                 return 0;
 225         }
 226
 227         return I915_READ(reg);
 228 }
 229
 230 /*
 231  * Handle hotplug events outside the interrupt handler proper.
 232  */
 233 static void i915_hotplug_work_func(struct work_struct *work)
 234 {
 235         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 236                                                     hotplug_work);
 237         struct drm_device *dev = dev_priv->dev;
 238         struct drm_mode_config *mode_config = &dev->mode_config;
 239         struct drm_connector *connector;
 240
 241         if (mode_config->num_connector) {
 242                 list_for_each_entry(connector, &mode_config->connector_list, head) {
 243                         struct intel_output *intel_output = to_intel_output(connector);
 244
 245                         if (intel_output->hot_plug)
 246                                 (*intel_output->hot_plug) (intel_output);
 247                 }
 248         }
 249         /* Just fire off a uevent and let userspace tell us what to do */
 250         drm_sysfs_hotplug_event(dev);
 251 }
 252
 253 irqreturn_t igdng_irq_handler(struct drm_device *dev)
 254 {
 255         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 256         int ret = IRQ_NONE;
 257         u32 de_iir, gt_iir;
 258         u32 new_de_iir, new_gt_iir;
 259         struct drm_i915_master_private *master_priv;
 260
 261         de_iir = I915_READ(DEIIR);
 262         gt_iir = I915_READ(GTIIR);
 263
 264         for (;;) {
 265                 if (de_iir == 0 && gt_iir == 0)
 266                         break;
 267
 268                 ret = IRQ_HANDLED;
 269
 270                 I915_WRITE(DEIIR, de_iir);
 271                 new_de_iir = I915_READ(DEIIR);
 272                 I915_WRITE(GTIIR, gt_iir);
 273                 new_gt_iir = I915_READ(GTIIR);
 274
 275                 if (dev->primary->master) {
 276                         master_priv = dev->primary->master->driver_priv;
 277                         if (master_priv->sarea_priv)
 278                                 master_priv->sarea_priv->last_dispatch =
 279                                         READ_BREADCRUMB(dev_priv);
 280                 }
 281
 282                 if (gt_iir & GT_USER_INTERRUPT) {
 283                         u32 seqno = i915_get_gem_seqno(dev);
 284                         dev_priv->mm.irq_gem_seqno = seqno;
 285                         trace_i915_gem_request_complete(dev, seqno);
 286                         DRM_WAKEUP(&dev_priv->irq_queue);
 287                 }
 288
 289                 de_iir = new_de_iir;
 290                 gt_iir = new_gt_iir;
 291         }
 292
 293         return ret;
 294 }
 295
 296 /**
 297  * i915_error_work_func - do process context error handling work
 298  * @work: work struct
 299  *
 300  * Fire an error uevent so userspace can see that a hang or error
 301  * was detected.
 302  */
 303 static void i915_error_work_func(struct work_struct *work)
 304 {
 305         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 306                                                     error_work);
 307         struct drm_device *dev = dev_priv->dev;
 308         char *error_event[] = { "ERROR=1", NULL };
 309         char *reset_event[] = { "RESET=1", NULL };
 310         char *reset_done_event[] = { "ERROR=0", NULL };
 311
 312         DRM_DEBUG("generating error event\n");
 313         kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, error_event);
 314
 315         if (atomic_read(&dev_priv->mm.wedged)) {
 316                 if (IS_I965G(dev)) {
 317                         DRM_DEBUG("resetting chip\n");
 318                         kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_event);
 319                         if (!i965_reset(dev, GDRST_RENDER)) {
 320                                 atomic_set(&dev_priv->mm.wedged, 0);
 321                                 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_done_event);
 322                         }
 323                 } else {
 324                         printk("reboot required\n");
 325                 }
 326         }
 327 }
 328
 329 /**
 330  * i915_capture_error_state - capture an error record for later analysis
 331  * @dev: drm device
 332  *
 333  * Should be called when an error is detected (either a hang or an error
 334  * interrupt) to capture error state from the time of the error.  Fills
 335  * out a structure which becomes available in debugfs for user level tools
 336  * to pick up.
 337  */
 338 static void i915_capture_error_state(struct drm_device *dev)
 339 {
 340         struct drm_i915_private *dev_priv = dev->dev_private;
 341         struct drm_i915_error_state *error;
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&dev_priv->error_lock, flags);
 345         if (dev_priv->first_error)
 346                 goto out;
 347
 348         error = kmalloc(sizeof(*error), GFP_ATOMIC);
 349         if (!error) {
 350                 DRM_DEBUG("out ot memory, not capturing error state\n");
 351                 goto out;
 352         }
 353
 354         error->eir = I915_READ(EIR);
 355         error->pgtbl_er = I915_READ(PGTBL_ER);
 356         error->pipeastat = I915_READ(PIPEASTAT);
 357         error->pipebstat = I915_READ(PIPEBSTAT);
 358         error->instpm = I915_READ(INSTPM);
 359         if (!IS_I965G(dev)) {
 360                 error->ipeir = I915_READ(IPEIR);
 361                 error->ipehr = I915_READ(IPEHR);
 362                 error->instdone = I915_READ(INSTDONE);
 363                 error->acthd = I915_READ(ACTHD);
 364         } else {
 365                 error->ipeir = I915_READ(IPEIR_I965);
 366                 error->ipehr = I915_READ(IPEHR_I965);
 367                 error->instdone = I915_READ(INSTDONE_I965);
 368                 error->instps = I915_READ(INSTPS);
 369                 error->instdone1 = I915_READ(INSTDONE1);
 370                 error->acthd = I915_READ(ACTHD_I965);
 371         }
 372
 373         do_gettimeofday(&error->time);
 374
 375         dev_priv->first_error = error;
 376
 377 out:
 378         spin_unlock_irqrestore(&dev_priv->error_lock, flags);
 379 }
 380
 381 /**
 382  * i915_handle_error - handle an error interrupt
 383  * @dev: drm device
 384  *
 385  * Do some basic checking of regsiter state at error interrupt time and
 386  * dump it to the syslog.  Also call i915_capture_error_state() to make
 387  * sure we get a record and make it available in debugfs.  Fire a uevent
 388  * so userspace knows something bad happened (should trigger collection
 389  * of a ring dump etc.).
 390  */
 391 static void i915_handle_error(struct drm_device *dev, bool wedged)
 392 {
 393         struct drm_i915_private *dev_priv = dev->dev_private;
 394         u32 eir = I915_READ(EIR);
 395         u32 pipea_stats = I915_READ(PIPEASTAT);
 396         u32 pipeb_stats = I915_READ(PIPEBSTAT);
 397
 398         i915_capture_error_state(dev);
 399
 400         printk(KERN_ERR "render error detected, EIR: 0x%08x\n",
 401                eir);
 402
 403         if (IS_G4X(dev)) {
 404                 if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
 405                         u32 ipeir = I915_READ(IPEIR_I965);
 406
 407                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
 408                                I915_READ(IPEIR_I965));
 409                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
 410                                I915_READ(IPEHR_I965));
 411                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
 412                                I915_READ(INSTDONE_I965));
 413                         printk(KERN_ERR "  INSTPS: 0x%08x\n",
 414                                I915_READ(INSTPS));
 415                         printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
 416                                I915_READ(INSTDONE1));
 417                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
 418                                I915_READ(ACTHD_I965));
 419                         I915_WRITE(IPEIR_I965, ipeir);
 420                         (void)I915_READ(IPEIR_I965);
 421                 }
 422                 if (eir & GM45_ERROR_PAGE_TABLE) {
 423                         u32 pgtbl_err = I915_READ(PGTBL_ER);
 424                         printk(KERN_ERR "page table error\n");
 425                         printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
 426                                pgtbl_err);
 427                         I915_WRITE(PGTBL_ER, pgtbl_err);
 428                         (void)I915_READ(PGTBL_ER);
 429                 }
 430         }
 431
 432         if (IS_I9XX(dev)) {
 433                 if (eir & I915_ERROR_PAGE_TABLE) {
 434                         u32 pgtbl_err = I915_READ(PGTBL_ER);
 435                         printk(KERN_ERR "page table error\n");
 436                         printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
 437                                pgtbl_err);
 438                         I915_WRITE(PGTBL_ER, pgtbl_err);
 439                         (void)I915_READ(PGTBL_ER);
 440                 }
 441         }
 442
 443         if (eir & I915_ERROR_MEMORY_REFRESH) {
 444                 printk(KERN_ERR "memory refresh error\n");
 445                 printk(KERN_ERR "PIPEASTAT: 0x%08x\n",
 446                        pipea_stats);
 447                 printk(KERN_ERR "PIPEBSTAT: 0x%08x\n",
 448                        pipeb_stats);
 449                 /* pipestat has already been acked */
 450         }
 451         if (eir & I915_ERROR_INSTRUCTION) {
 452                 printk(KERN_ERR "instruction error\n");
 453                 printk(KERN_ERR "  INSTPM: 0x%08x\n",
 454                        I915_READ(INSTPM));
 455                 if (!IS_I965G(dev)) {
 456                         u32 ipeir = I915_READ(IPEIR);
 457
 458                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
 459                                I915_READ(IPEIR));
 460                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
 461                                I915_READ(IPEHR));
 462                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
 463                                I915_READ(INSTDONE));
 464                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
 465                                I915_READ(ACTHD));
 466                         I915_WRITE(IPEIR, ipeir);
 467                         (void)I915_READ(IPEIR);
 468                 } else {
 469                         u32 ipeir = I915_READ(IPEIR_I965);
 470
 471                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
 472                                I915_READ(IPEIR_I965));
 473                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
 474                                I915_READ(IPEHR_I965));
 475                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
 476                                I915_READ(INSTDONE_I965));
 477                         printk(KERN_ERR "  INSTPS: 0x%08x\n",
 478                                I915_READ(INSTPS));
 479                         printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
 480                                I915_READ(INSTDONE1));
 481                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
 482                                I915_READ(ACTHD_I965));
 483                         I915_WRITE(IPEIR_I965, ipeir);
 484                         (void)I915_READ(IPEIR_I965);
 485                 }
 486         }
 487
 488         I915_WRITE(EIR, eir);
 489         (void)I915_READ(EIR);
 490         eir = I915_READ(EIR);
 491         if (eir) {
 492                 /*
 493                  * some errors might have become stuck,
 494                  * mask them.
 495                  */
 496                 DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
 497                 I915_WRITE(EMR, I915_READ(EMR) | eir);
 498                 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
 499         }
 500
 501         if (wedged) {
 502                 atomic_set(&dev_priv->mm.wedged, 1);
 503
 504                 /*
 505                  * Wakeup waiting processes so they don't hang
 506                  */
 507                 printk("i915: Waking up sleeping processes\n");
 508                 DRM_WAKEUP(&dev_priv->irq_queue);
 509         }
 510
 511         queue_work(dev_priv->wq, &dev_priv->error_work);
 512 }
 513
 514 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 515 {
 516         struct drm_device *dev = (struct drm_device *) arg;
 517         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 518         struct drm_i915_master_private *master_priv;
 519         u32 iir, new_iir;
 520         u32 pipea_stats, pipeb_stats;
 521         u32 vblank_status;
 522         u32 vblank_enable;
 523         int vblank = 0;
 524         unsigned long irqflags;
 525         int irq_received;
 526         int ret = IRQ_NONE;
 527
 528         atomic_inc(&dev_priv->irq_received);
 529
 530         if (IS_IGDNG(dev))
 531                 return igdng_irq_handler(dev);
 532
 533         iir = I915_READ(IIR);
 534
 535         if (IS_I965G(dev)) {
 536                 vblank_status = I915_START_VBLANK_INTERRUPT_STATUS;
 537                 vblank_enable = PIPE_START_VBLANK_INTERRUPT_ENABLE;
 538         } else {
 539                 vblank_status = I915_VBLANK_INTERRUPT_STATUS;
 540                 vblank_enable = I915_VBLANK_INTERRUPT_ENABLE;
 541         }
 542
 543         for (;;) {
 544                 irq_received = iir != 0;
 545
 546                 /* Can't rely on pipestat interrupt bit in iir as it might
 547                  * have been cleared after the pipestat interrupt was received.
 548                  * It doesn't set the bit in iir again, but it still produces
 549                  * interrupts (for non-MSI).
 550                  */
 551                 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 552                 pipea_stats = I915_READ(PIPEASTAT);
 553                 pipeb_stats = I915_READ(PIPEBSTAT);
 554
 555                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
 556                         i915_handle_error(dev, false);
 557
 558                 /*
 559                  * Clear the PIPE(A|B)STAT regs before the IIR
 560                  */
 561                 if (pipea_stats & 0x8000ffff) {
 562                         if (pipea_stats &  PIPE_FIFO_UNDERRUN_STATUS)
 563                                 DRM_DEBUG("pipe a underrun\n");
 564                         I915_WRITE(PIPEASTAT, pipea_stats);
 565                         irq_received = 1;
 566                 }
 567
 568                 if (pipeb_stats & 0x8000ffff) {
 569                         if (pipeb_stats &  PIPE_FIFO_UNDERRUN_STATUS)
 570                                 DRM_DEBUG("pipe b underrun\n");
 571                         I915_WRITE(PIPEBSTAT, pipeb_stats);
 572                         irq_received = 1;
 573                 }
 574                 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 575
 576                 if (!irq_received)
 577                         break;
 578
 579                 ret = IRQ_HANDLED;
 580
 581                 /* Consume port.  Then clear IIR or we'll miss events */
 582                 if ((I915_HAS_HOTPLUG(dev)) &&
 583                     (iir & I915_DISPLAY_PORT_INTERRUPT)) {
 584                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
 585
 586                         DRM_DEBUG("hotplug event received, stat 0x%08x\n",
 587                                   hotplug_status);
 588                         if (hotplug_status & dev_priv->hotplug_supported_mask)
 589                                 queue_work(dev_priv->wq,
 590                                            &dev_priv->hotplug_work);
 591
 592                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 593                         I915_READ(PORT_HOTPLUG_STAT);
 594
 595                         /* EOS interrupts occurs */
 596                         if (IS_IGD(dev) &&
 597                                 (hotplug_status & CRT_EOS_INT_STATUS)) {
 598                                 u32 temp;
 599
 600                                 DRM_DEBUG("EOS interrupt occurs\n");
 601                                 /* status is already cleared */
 602                                 temp = I915_READ(ADPA);
 603                                 temp &= ~ADPA_DAC_ENABLE;
 604                                 I915_WRITE(ADPA, temp);
 605
 606                                 temp = I915_READ(PORT_HOTPLUG_EN);
 607                                 temp &= ~CRT_EOS_INT_EN;
 608                                 I915_WRITE(PORT_HOTPLUG_EN, temp);
 609
 610                                 temp = I915_READ(PORT_HOTPLUG_STAT);
 611                                 if (temp & CRT_EOS_INT_STATUS)
 612                                         I915_WRITE(PORT_HOTPLUG_STAT,
 613                                                 CRT_EOS_INT_STATUS);
 614                         }
 615                 }
 616
 617                 I915_WRITE(IIR, iir);
 618                 new_iir = I915_READ(IIR); /* Flush posted writes */
 619
 620                 if (dev->primary->master) {
 621                         master_priv = dev->primary->master->driver_priv;
 622                         if (master_priv->sarea_priv)
 623                                 master_priv->sarea_priv->last_dispatch =
 624                                         READ_BREADCRUMB(dev_priv);
 625                 }
 626
 627                 if (iir & I915_USER_INTERRUPT) {
 628                         u32 seqno = i915_get_gem_seqno(dev);
 629                         dev_priv->mm.irq_gem_seqno = seqno;
 630                         trace_i915_gem_request_complete(dev, seqno);
 631                         DRM_WAKEUP(&dev_priv->irq_queue);
 632                         dev_priv->hangcheck_count = 0;
 633                         mod_timer(&dev_priv->hangcheck_timer, jiffies + DRM_I915_HANGCHECK_PERIOD);
 634                 }
 635
 636                 if (pipea_stats & vblank_status) {
 637                         vblank++;
 638                         drm_handle_vblank(dev, 0);
 639                 }
 640
 641                 if (pipeb_stats & vblank_status) {
 642                         vblank++;
 643                         drm_handle_vblank(dev, 1);
 644                 }
 645
 646                 if ((pipeb_stats & I915_LEGACY_BLC_EVENT_STATUS) ||
 647                     (iir & I915_ASLE_INTERRUPT))
 648                         opregion_asle_intr(dev);
 649
 650                 /* With MSI, interrupts are only generated when iir
 651                  * transitions from zero to nonzero.  If another bit got
 652                  * set while we were handling the existing iir bits, then
 653                  * we would never get another interrupt.
 654                  *
 655                  * This is fine on non-MSI as well, as if we hit this path
 656                  * we avoid exiting the interrupt handler only to generate
 657                  * another one.
 658                  *
 659                  * Note that for MSI this could cause a stray interrupt report
 660                  * if an interrupt landed in the time between writing IIR and
 661                  * the posting read.  This should be rare enough to never
 662                  * trigger the 99% of 100,000 interrupts test for disabling
 663                  * stray interrupts.
 664                  */
 665                 iir = new_iir;
 666         }
 667
 668         return ret;
 669 }
 670
 671 static int i915_emit_irq(struct drm_device * dev)
 672 {
 673         drm_i915_private_t *dev_priv = dev->dev_private;
 674         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 675         RING_LOCALS;
 676
 677         i915_kernel_lost_context(dev);
 678
 679         DRM_DEBUG("\n");
 680
 681         dev_priv->counter++;
 682         if (dev_priv->counter > 0x7FFFFFFFUL)
 683                 dev_priv->counter = 1;
 684         if (master_priv->sarea_priv)
 685                 master_priv->sarea_priv->last_enqueue = dev_priv->counter;
 686
 687         BEGIN_LP_RING(4);
 688         OUT_RING(MI_STORE_DWORD_INDEX);
 689         OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 690         OUT_RING(dev_priv->counter);
 691         OUT_RING(MI_USER_INTERRUPT);
 692         ADVANCE_LP_RING();
 693
 694         return dev_priv->counter;
 695 }
 696
 697 void i915_user_irq_get(struct drm_device *dev)
 698 {
 699         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 700         unsigned long irqflags;
 701
 702         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 703         if (dev->irq_enabled && (++dev_priv->user_irq_refcount == 1)) {
 704                 if (IS_IGDNG(dev))
 705                         igdng_enable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
 706                 else
 707                         i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
 708         }
 709         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 710 }
 711
 712 void i915_user_irq_put(struct drm_device *dev)
 713 {
 714         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 715         unsigned long irqflags;
 716
 717         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 718         BUG_ON(dev->irq_enabled && dev_priv->user_irq_refcount <= 0);
 719         if (dev->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
 720                 if (IS_IGDNG(dev))
 721                         igdng_disable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
 722                 else
 723                         i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
 724         }
 725         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 726 }
 727
 728 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 729 {
 730         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 731         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 732         int ret = 0;
 733
 734         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 735                   READ_BREADCRUMB(dev_priv));
 736
 737         if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
 738                 if (master_priv->sarea_priv)
 739                         master_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 740                 return 0;
 741         }
 742
 743         if (master_priv->sarea_priv)
 744                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 745
 746         i915_user_irq_get(dev);
 747         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 748                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 749         i915_user_irq_put(dev);
 750
 751         if (ret == -EBUSY) {
 752                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 753                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 754         }
 755
 756         return ret;
 757 }
 758
 759 /* Needs the lock as it touches the ring.
 760  */
 761 int i915_irq_emit(struct drm_device *dev, void *data,
 762                          struct drm_file *file_priv)
 763 {
 764         drm_i915_private_t *dev_priv = dev->dev_private;
 765         drm_i915_irq_emit_t *emit = data;
 766         int result;
 767
 768         if (!dev_priv || !dev_priv->ring.virtual_start) {
 769                 DRM_ERROR("called with no initialization\n");
 770                 return -EINVAL;
 771         }
 772
 773         RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
 774
 775         mutex_lock(&dev->struct_mutex);
 776         result = i915_emit_irq(dev);
 777         mutex_unlock(&dev->struct_mutex);
 778
 779         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 780                 DRM_ERROR("copy_to_user\n");
 781                 return -EFAULT;
 782         }
 783
 784         return 0;
 785 }
 786
 787 /* Doesn't need the hardware lock.
 788  */
 789 int i915_irq_wait(struct drm_device *dev, void *data,
 790                          struct drm_file *file_priv)
 791 {
 792         drm_i915_private_t *dev_priv = dev->dev_private;
 793         drm_i915_irq_wait_t *irqwait = data;
 794
 795         if (!dev_priv) {
 796                 DRM_ERROR("called with no initialization\n");
 797                 return -EINVAL;
 798         }
 799
 800         return i915_wait_irq(dev, irqwait->irq_seq);
 801 }
 802
 803 /* Called from drm generic code, passed 'crtc' which
 804  * we use as a pipe index
 805  */
 806 int i915_enable_vblank(struct drm_device *dev, int pipe)
 807 {
 808         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 809         unsigned long irqflags;
 810         int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
 811         u32 pipeconf;
 812
 813         pipeconf = I915_READ(pipeconf_reg);
 814         if (!(pipeconf & PIPEACONF_ENABLE))
 815                 return -EINVAL;
 816
 817         if (IS_IGDNG(dev))
 818                 return 0;
 819
 820         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 821         if (IS_I965G(dev))
 822                 i915_enable_pipestat(dev_priv, pipe,
 823                                      PIPE_START_VBLANK_INTERRUPT_ENABLE);
 824         else
 825                 i915_enable_pipestat(dev_priv, pipe,
 826                                      PIPE_VBLANK_INTERRUPT_ENABLE);
 827         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 828         return 0;
 829 }
 830
 831 /* Called from drm generic code, passed 'crtc' which
 832  * we use as a pipe index
 833  */
 834 void i915_disable_vblank(struct drm_device *dev, int pipe)
 835 {
 836         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 837         unsigned long irqflags;
 838
 839         if (IS_IGDNG(dev))
 840                 return;
 841
 842         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 843         i915_disable_pipestat(dev_priv, pipe,
 844                               PIPE_VBLANK_INTERRUPT_ENABLE |
 845                               PIPE_START_VBLANK_INTERRUPT_ENABLE);
 846         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 847 }
 848
 849 void i915_enable_interrupt (struct drm_device *dev)
 850 {
 851         struct drm_i915_private *dev_priv = dev->dev_private;
 852
 853         if (!IS_IGDNG(dev))
 854                 opregion_enable_asle(dev);
 855         dev_priv->irq_enabled = 1;
 856 }
 857
 858
 859 /* Set the vblank monitor pipe
 860  */
 861 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 862                          struct drm_file *file_priv)
 863 {
 864         drm_i915_private_t *dev_priv = dev->dev_private;
 865
 866         if (!dev_priv) {
 867                 DRM_ERROR("called with no initialization\n");
 868                 return -EINVAL;
 869         }
 870
 871         return 0;
 872 }
 873
 874 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 875                          struct drm_file *file_priv)
 876 {
 877         drm_i915_private_t *dev_priv = dev->dev_private;
 878         drm_i915_vblank_pipe_t *pipe = data;
 879
 880         if (!dev_priv) {
 881                 DRM_ERROR("called with no initialization\n");
 882                 return -EINVAL;
 883         }
 884
 885         pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 886
 887         return 0;
 888 }
 889
 890 /**
 891  * Schedule buffer swap at given vertical blank.
 892  */
 893 int i915_vblank_swap(struct drm_device *dev, void *data,
 894                      struct drm_file *file_priv)
 895 {
 896         /* The delayed swap mechanism was fundamentally racy, and has been
 897          * removed.  The model was that the client requested a delayed flip/swap
 898          * from the kernel, then waited for vblank before continuing to perform
 899          * rendering.  The problem was that the kernel might wake the client
 900          * up before it dispatched the vblank swap (since the lock has to be
 901          * held while touching the ringbuffer), in which case the client would
 902          * clear and start the next frame before the swap occurred, and
 903          * flicker would occur in addition to likely missing the vblank.
 904          *
 905          * In the absence of this ioctl, userland falls back to a correct path
 906          * of waiting for a vblank, then dispatching the swap on its own.
 907          * Context switching to userland and back is plenty fast enough for
 908          * meeting the requirements of vblank swapping.
 909          */
 910         return -EINVAL;
 911 }
 912
 913 struct drm_i915_gem_request *i915_get_tail_request(struct drm_device *dev) {
 914         drm_i915_private_t *dev_priv = dev->dev_private;
 915         return list_entry(dev_priv->mm.request_list.prev, struct drm_i915_gem_request, list);
 916 }
 917
 918 /**
 919  * This is called when the chip hasn't reported back with completed
 920  * batchbuffers in a long time. The first time this is called we simply record
 921  * ACTHD. If ACTHD hasn't changed by the time the hangcheck timer elapses
 922  * again, we assume the chip is wedged and try to fix it.
 923  */
 924 void i915_hangcheck_elapsed(unsigned long data)
 925 {
 926         struct drm_device *dev = (struct drm_device *)data;
 927         drm_i915_private_t *dev_priv = dev->dev_private;
 928         uint32_t acthd;
 929
 930         if (!IS_I965G(dev))
 931                 acthd = I915_READ(ACTHD);
 932         else
 933                 acthd = I915_READ(ACTHD_I965);
 934
 935         /* If all work is done then ACTHD clearly hasn't advanced. */
 936         if (list_empty(&dev_priv->mm.request_list) ||
 937                        i915_seqno_passed(i915_get_gem_seqno(dev), i915_get_tail_request(dev)->seqno)) {
 938                 dev_priv->hangcheck_count = 0;
 939                 return;
 940         }
 941
 942         if (dev_priv->last_acthd == acthd && dev_priv->hangcheck_count > 0) {
 943                 DRM_ERROR("Hangcheck timer elapsed... GPU hung\n");
 944                 i915_handle_error(dev, true);
 945                 return;
 946         }
 947
 948         /* Reset timer case chip hangs without another request being added */
 949         mod_timer(&dev_priv->hangcheck_timer, jiffies + DRM_I915_HANGCHECK_PERIOD);
 950
 951         if (acthd != dev_priv->last_acthd)
 952                 dev_priv->hangcheck_count = 0;
 953         else
 954                 dev_priv->hangcheck_count++;
 955
 956         dev_priv->last_acthd = acthd;
 957 }
 958
 959 /* drm_dma.h hooks
 960 */
 961 static void igdng_irq_preinstall(struct drm_device *dev)
 962 {
 963         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 964
 965         I915_WRITE(HWSTAM, 0xeffe);
 966
 967         /* XXX hotplug from PCH */
 968
 969         I915_WRITE(DEIMR, 0xffffffff);
 970         I915_WRITE(DEIER, 0x0);
 971         (void) I915_READ(DEIER);
 972
 973         /* and GT */
 974         I915_WRITE(GTIMR, 0xffffffff);
 975         I915_WRITE(GTIER, 0x0);
 976         (void) I915_READ(GTIER);
 977 }
 978
 979 static int igdng_irq_postinstall(struct drm_device *dev)
 980 {
 981         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 982         /* enable kind of interrupts always enabled */
 983         u32 display_mask = DE_MASTER_IRQ_CONTROL /*| DE_PCH_EVENT */;
 984         u32 render_mask = GT_USER_INTERRUPT;
 985
 986         dev_priv->irq_mask_reg = ~display_mask;
 987         dev_priv->de_irq_enable_reg = display_mask;
 988
 989         /* should always can generate irq */
 990         I915_WRITE(DEIIR, I915_READ(DEIIR));
 991         I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
 992         I915_WRITE(DEIER, dev_priv->de_irq_enable_reg);
 993         (void) I915_READ(DEIER);
 994
 995         /* user interrupt should be enabled, but masked initial */
 996         dev_priv->gt_irq_mask_reg = 0xffffffff;
 997         dev_priv->gt_irq_enable_reg = render_mask;
 998
 999         I915_WRITE(GTIIR, I915_READ(GTIIR));
1000         I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
1001         I915_WRITE(GTIER, dev_priv->gt_irq_enable_reg);
1002         (void) I915_READ(GTIER);
1003
1004         return 0;
1005 }
1006
1007 void i915_driver_irq_preinstall(struct drm_device * dev)
1008 {
1009         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1010
1011         atomic_set(&dev_priv->irq_received, 0);
1012
1013         INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
1014         INIT_WORK(&dev_priv->error_work, i915_error_work_func);
1015
1016         if (IS_IGDNG(dev)) {
1017                 igdng_irq_preinstall(dev);
1018                 return;
1019         }
1020
1021         if (I915_HAS_HOTPLUG(dev)) {
1022                 I915_WRITE(PORT_HOTPLUG_EN, 0);
1023                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
1024         }
1025
1026         I915_WRITE(HWSTAM, 0xeffe);
1027         I915_WRITE(PIPEASTAT, 0);
1028         I915_WRITE(PIPEBSTAT, 0);
1029         I915_WRITE(IMR, 0xffffffff);
1030         I915_WRITE(IER, 0x0);
1031         (void) I915_READ(IER);
1032 }
1033
1034 int i915_driver_irq_postinstall(struct drm_device *dev)
1035 {
1036         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1037         u32 enable_mask = I915_INTERRUPT_ENABLE_FIX | I915_INTERRUPT_ENABLE_VAR;
1038         u32 error_mask;
1039
1040         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
1041
1042         dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1043
1044         if (IS_IGDNG(dev))
1045                 return igdng_irq_postinstall(dev);
1046
1047         /* Unmask the interrupts that we always want on. */
1048         dev_priv->irq_mask_reg = ~I915_INTERRUPT_ENABLE_FIX;
1049
1050         dev_priv->pipestat[0] = 0;
1051         dev_priv->pipestat[1] = 0;
1052
1053         if (I915_HAS_HOTPLUG(dev)) {
1054                 u32 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
1055
1056                 /* Leave other bits alone */
1057                 hotplug_en |= HOTPLUG_EN_MASK;
1058                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
1059
1060                 dev_priv->hotplug_supported_mask = CRT_HOTPLUG_INT_STATUS |
1061                         TV_HOTPLUG_INT_STATUS | SDVOC_HOTPLUG_INT_STATUS |
1062                         SDVOB_HOTPLUG_INT_STATUS;
1063                 if (IS_G4X(dev)) {
1064                         dev_priv->hotplug_supported_mask |=
1065                                 HDMIB_HOTPLUG_INT_STATUS |
1066                                 HDMIC_HOTPLUG_INT_STATUS |
1067                                 HDMID_HOTPLUG_INT_STATUS;
1068                 }
1069                 /* Enable in IER... */
1070                 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
1071                 /* and unmask in IMR */
1072                 i915_enable_irq(dev_priv, I915_DISPLAY_PORT_INTERRUPT);
1073         }
1074
1075         /*
1076          * Enable some error detection, note the instruction error mask
1077          * bit is reserved, so we leave it masked.
1078          */
1079         if (IS_G4X(dev)) {
1080                 error_mask = ~(GM45_ERROR_PAGE_TABLE |
1081                                GM45_ERROR_MEM_PRIV |
1082                                GM45_ERROR_CP_PRIV |
1083                                I915_ERROR_MEMORY_REFRESH);
1084         } else {
1085                 error_mask = ~(I915_ERROR_PAGE_TABLE |
1086                                I915_ERROR_MEMORY_REFRESH);
1087         }
1088         I915_WRITE(EMR, error_mask);
1089
1090         /* Disable pipe interrupt enables, clear pending pipe status */
1091         I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
1092         I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
1093         /* Clear pending interrupt status */
1094         I915_WRITE(IIR, I915_READ(IIR));
1095
1096         I915_WRITE(IER, enable_mask);
1097         I915_WRITE(IMR, dev_priv->irq_mask_reg);
1098         (void) I915_READ(IER);
1099
1100         opregion_enable_asle(dev);
1101
1102         return 0;
1103 }
1104
1105 static void igdng_irq_uninstall(struct drm_device *dev)
1106 {
1107         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1108         I915_WRITE(HWSTAM, 0xffffffff);
1109
1110         I915_WRITE(DEIMR, 0xffffffff);
1111         I915_WRITE(DEIER, 0x0);
1112         I915_WRITE(DEIIR, I915_READ(DEIIR));
1113
1114         I915_WRITE(GTIMR, 0xffffffff);
1115         I915_WRITE(GTIER, 0x0);
1116         I915_WRITE(GTIIR, I915_READ(GTIIR));
1117 }
1118
1119 void i915_driver_irq_uninstall(struct drm_device * dev)
1120 {
1121         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1122
1123         if (!dev_priv)
1124                 return;
1125
1126         dev_priv->vblank_pipe = 0;
1127
1128         if (IS_IGDNG(dev)) {
1129                 igdng_irq_uninstall(dev);
1130                 return;
1131         }
1132
1133         if (I915_HAS_HOTPLUG(dev)) {
1134                 I915_WRITE(PORT_HOTPLUG_EN, 0);
1135                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
1136         }
1137
1138         I915_WRITE(HWSTAM, 0xffffffff);
1139         I915_WRITE(PIPEASTAT, 0);
1140         I915_WRITE(PIPEBSTAT, 0);
1141         I915_WRITE(IMR, 0xffffffff);
1142         I915_WRITE(IER, 0x0);
1143
1144         I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
1145         I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
1146         I915_WRITE(IIR, I915_READ(IIR));
1147 }