drivers/gpu/drm/gma500/psb_irq.c

   1 /**************************************************************************
   2  * Copyright (c) 2007, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
  19  * develop this driver.
  20  *
  21  **************************************************************************/
  22 /*
  23  */
  24
  25 #include <drm/drmP.h>
  26 #include "psb_drv.h"
  27 #include "psb_reg.h"
  28 #include "psb_intel_reg.h"
  29 #include "power.h"
  30 #include "psb_irq.h"
  31 #include "mdfld_output.h"
  32
  33 /*
  34  * inline functions
  35  */
  36
  37 static inline u32
  38 psb_pipestat(int pipe)
  39 {
  40         if (pipe == 0)
  41                 return PIPEASTAT;
  42         if (pipe == 1)
  43                 return PIPEBSTAT;
  44         if (pipe == 2)
  45                 return PIPECSTAT;
  46         BUG();
  47 }
  48
  49 static inline u32
  50 mid_pipe_event(int pipe)
  51 {
  52         if (pipe == 0)
  53                 return _PSB_PIPEA_EVENT_FLAG;
  54         if (pipe == 1)
  55                 return _MDFLD_PIPEB_EVENT_FLAG;
  56         if (pipe == 2)
  57                 return _MDFLD_PIPEC_EVENT_FLAG;
  58         BUG();
  59 }
  60
  61 static inline u32
  62 mid_pipe_vsync(int pipe)
  63 {
  64         if (pipe == 0)
  65                 return _PSB_VSYNC_PIPEA_FLAG;
  66         if (pipe == 1)
  67                 return _PSB_VSYNC_PIPEB_FLAG;
  68         if (pipe == 2)
  69                 return _MDFLD_PIPEC_VBLANK_FLAG;
  70         BUG();
  71 }
  72
  73 static inline u32
  74 mid_pipeconf(int pipe)
  75 {
  76         if (pipe == 0)
  77                 return PIPEACONF;
  78         if (pipe == 1)
  79                 return PIPEBCONF;
  80         if (pipe == 2)
  81                 return PIPECCONF;
  82         BUG();
  83 }
  84
  85 void
  86 psb_enable_pipestat(struct drm_psb_private *dev_priv, int pipe, u32 mask)
  87 {
  88         if ((dev_priv->pipestat[pipe] & mask) != mask) {
  89                 u32 reg = psb_pipestat(pipe);
  90                 dev_priv->pipestat[pipe] |= mask;
  91                 /* Enable the interrupt, clear any pending status */
  92                 if (gma_power_begin(dev_priv->dev, false)) {
  93                         u32 writeVal = PSB_RVDC32(reg);
  94                         writeVal |= (mask | (mask >> 16));
  95                         PSB_WVDC32(writeVal, reg);
  96                         (void) PSB_RVDC32(reg);
  97                         gma_power_end(dev_priv->dev);
  98                 }
  99         }
 100 }
 101
 102 void
 103 psb_disable_pipestat(struct drm_psb_private *dev_priv, int pipe, u32 mask)
 104 {
 105         if ((dev_priv->pipestat[pipe] & mask) != 0) {
 106                 u32 reg = psb_pipestat(pipe);
 107                 dev_priv->pipestat[pipe] &= ~mask;
 108                 if (gma_power_begin(dev_priv->dev, false)) {
 109                         u32 writeVal = PSB_RVDC32(reg);
 110                         writeVal &= ~mask;
 111                         PSB_WVDC32(writeVal, reg);
 112                         (void) PSB_RVDC32(reg);
 113                         gma_power_end(dev_priv->dev);
 114                 }
 115         }
 116 }
 117
 118 static void mid_enable_pipe_event(struct drm_psb_private *dev_priv, int pipe)
 119 {
 120         if (gma_power_begin(dev_priv->dev, false)) {
 121                 u32 pipe_event = mid_pipe_event(pipe);
 122                 dev_priv->vdc_irq_mask |= pipe_event;
 123                 PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
 124                 PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
 125                 gma_power_end(dev_priv->dev);
 126         }
 127 }
 128
 129 static void mid_disable_pipe_event(struct drm_psb_private *dev_priv, int pipe)
 130 {
 131         if (dev_priv->pipestat[pipe] == 0) {
 132                 if (gma_power_begin(dev_priv->dev, false)) {
 133                         u32 pipe_event = mid_pipe_event(pipe);
 134                         dev_priv->vdc_irq_mask &= ~pipe_event;
 135                         PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
 136                         PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
 137                         gma_power_end(dev_priv->dev);
 138                 }
 139         }
 140 }
 141
 142 /**
 143  * Display controller interrupt handler for pipe event.
 144  *
 145  */
 146 static void mid_pipe_event_handler(struct drm_device *dev, int pipe)
 147 {
 148         struct drm_psb_private *dev_priv =
 149             (struct drm_psb_private *) dev->dev_private;
 150
 151         uint32_t pipe_stat_val = 0;
 152         uint32_t pipe_stat_reg = psb_pipestat(pipe);
 153         uint32_t pipe_enable = dev_priv->pipestat[pipe];
 154         uint32_t pipe_status = dev_priv->pipestat[pipe] >> 16;
 155         uint32_t pipe_clear;
 156         uint32_t i = 0;
 157
 158         spin_lock(&dev_priv->irqmask_lock);
 159
 160         pipe_stat_val = PSB_RVDC32(pipe_stat_reg);
 161         pipe_stat_val &= pipe_enable | pipe_status;
 162         pipe_stat_val &= pipe_stat_val >> 16;
 163
 164         spin_unlock(&dev_priv->irqmask_lock);
 165
 166         /* Clear the 2nd level interrupt status bits
 167          * Sometimes the bits are very sticky so we repeat until they unstick */
 168         for (i = 0; i < 0xffff; i++) {
 169                 PSB_WVDC32(PSB_RVDC32(pipe_stat_reg), pipe_stat_reg);
 170                 pipe_clear = PSB_RVDC32(pipe_stat_reg) & pipe_status;
 171
 172                 if (pipe_clear == 0)
 173                         break;
 174         }
 175
 176         if (pipe_clear)
 177                 dev_err(dev->dev,
 178                 "%s, can't clear status bits for pipe %d, its value = 0x%x.\n",
 179                 __func__, pipe, PSB_RVDC32(pipe_stat_reg));
 180
 181         if (pipe_stat_val & PIPE_VBLANK_STATUS)
 182                 drm_handle_vblank(dev, pipe);
 183
 184         if (pipe_stat_val & PIPE_TE_STATUS)
 185                 drm_handle_vblank(dev, pipe);
 186 }
 187
 188 /*
 189  * Display controller interrupt handler.
 190  */
 191 static void psb_vdc_interrupt(struct drm_device *dev, uint32_t vdc_stat)
 192 {
 193         if (vdc_stat & _PSB_IRQ_ASLE)
 194                 psb_intel_opregion_asle_intr(dev);
 195
 196         if (vdc_stat & _PSB_VSYNC_PIPEA_FLAG)
 197                 mid_pipe_event_handler(dev, 0);
 198
 199         if (vdc_stat & _PSB_VSYNC_PIPEB_FLAG)
 200                 mid_pipe_event_handler(dev, 1);
 201 }
 202
 203 irqreturn_t psb_irq_handler(int irq, void *arg)
 204 {
 205         struct drm_device *dev = arg;
 206         struct drm_psb_private *dev_priv = dev->dev_private;
 207         uint32_t vdc_stat, dsp_int = 0, sgx_int = 0, hotplug_int = 0;
 208         int handled = 0;
 209
 210         spin_lock(&dev_priv->irqmask_lock);
 211
 212         vdc_stat = PSB_RVDC32(PSB_INT_IDENTITY_R);
 213
 214         if (vdc_stat & (_PSB_PIPE_EVENT_FLAG|_PSB_IRQ_ASLE))
 215                 dsp_int = 1;
 216
 217         /* FIXME: Handle Medfield
 218         if (vdc_stat & _MDFLD_DISP_ALL_IRQ_FLAG)
 219                 dsp_int = 1;
 220         */
 221
 222         if (vdc_stat & _PSB_IRQ_SGX_FLAG)
 223                 sgx_int = 1;
 224         if (vdc_stat & _PSB_IRQ_DISP_HOTSYNC)
 225                 hotplug_int = 1;
 226
 227         vdc_stat &= dev_priv->vdc_irq_mask;
 228         spin_unlock(&dev_priv->irqmask_lock);
 229
 230         if (dsp_int && gma_power_is_on(dev)) {
 231                 psb_vdc_interrupt(dev, vdc_stat);
 232                 handled = 1;
 233         }
 234
 235         if (sgx_int) {
 236                 /* Not expected - we have it masked, shut it up */
 237                 u32 s, s2;
 238                 s = PSB_RSGX32(PSB_CR_EVENT_STATUS);
 239                 s2 = PSB_RSGX32(PSB_CR_EVENT_STATUS2);
 240                 PSB_WSGX32(s, PSB_CR_EVENT_HOST_CLEAR);
 241                 PSB_WSGX32(s2, PSB_CR_EVENT_HOST_CLEAR2);
 242                 /* if s & _PSB_CE_TWOD_COMPLETE we have 2D done but
 243                    we may as well poll even if we add that ! */
 244                 handled = 1;
 245         }
 246
 247         /* Note: this bit has other meanings on some devices, so we will
 248            need to address that later if it ever matters */
 249         if (hotplug_int && dev_priv->ops->hotplug) {
 250                 handled = dev_priv->ops->hotplug(dev);
 251                 REG_WRITE(PORT_HOTPLUG_STAT, REG_READ(PORT_HOTPLUG_STAT));
 252         }
 253
 254         PSB_WVDC32(vdc_stat, PSB_INT_IDENTITY_R);
 255         (void) PSB_RVDC32(PSB_INT_IDENTITY_R);
 256         rmb();
 257
 258         if (!handled)
 259                 return IRQ_NONE;
 260
 261         return IRQ_HANDLED;
 262 }
 263
 264 void psb_irq_preinstall(struct drm_device *dev)
 265 {
 266         struct drm_psb_private *dev_priv =
 267             (struct drm_psb_private *) dev->dev_private;
 268         unsigned long irqflags;
 269
 270         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 271
 272         if (gma_power_is_on(dev))
 273                 PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM);
 274         if (dev->vblank[0].enabled)
 275                 dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEA_FLAG;
 276         if (dev->vblank[1].enabled)
 277                 dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEB_FLAG;
 278
 279         /* FIXME: Handle Medfield irq mask
 280         if (dev->vblank[1].enabled)
 281                 dev_priv->vdc_irq_mask |= _MDFLD_PIPEB_EVENT_FLAG;
 282         if (dev->vblank[2].enabled)
 283                 dev_priv->vdc_irq_mask |= _MDFLD_PIPEC_EVENT_FLAG;
 284         */
 285
 286         /* Revisit this area - want per device masks ? */
 287         if (dev_priv->ops->hotplug)
 288                 dev_priv->vdc_irq_mask |= _PSB_IRQ_DISP_HOTSYNC;
 289         dev_priv->vdc_irq_mask |= _PSB_IRQ_ASLE;
 290
 291         /* This register is safe even if display island is off */
 292         PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
 293         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 294 }
 295
 296 int psb_irq_postinstall(struct drm_device *dev)
 297 {
 298         struct drm_psb_private *dev_priv =
 299             (struct drm_psb_private *) dev->dev_private;
 300         unsigned long irqflags;
 301
 302         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 303
 304         /* This register is safe even if display island is off */
 305         PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
 306         PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM);
 307
 308         if (dev->vblank[0].enabled)
 309                 psb_enable_pipestat(dev_priv, 0, PIPE_VBLANK_INTERRUPT_ENABLE);
 310         else
 311                 psb_disable_pipestat(dev_priv, 0, PIPE_VBLANK_INTERRUPT_ENABLE);
 312
 313         if (dev->vblank[1].enabled)
 314                 psb_enable_pipestat(dev_priv, 1, PIPE_VBLANK_INTERRUPT_ENABLE);
 315         else
 316                 psb_disable_pipestat(dev_priv, 1, PIPE_VBLANK_INTERRUPT_ENABLE);
 317
 318         if (dev->vblank[2].enabled)
 319                 psb_enable_pipestat(dev_priv, 2, PIPE_VBLANK_INTERRUPT_ENABLE);
 320         else
 321                 psb_disable_pipestat(dev_priv, 2, PIPE_VBLANK_INTERRUPT_ENABLE);
 322
 323         if (dev_priv->ops->hotplug_enable)
 324                 dev_priv->ops->hotplug_enable(dev, true);
 325
 326         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 327         return 0;
 328 }
 329
 330 void psb_irq_uninstall(struct drm_device *dev)
 331 {
 332         struct drm_psb_private *dev_priv = dev->dev_private;
 333         unsigned long irqflags;
 334
 335         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 336
 337         if (dev_priv->ops->hotplug_enable)
 338                 dev_priv->ops->hotplug_enable(dev, false);
 339
 340         PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM);
 341
 342         if (dev->vblank[0].enabled)
 343                 psb_disable_pipestat(dev_priv, 0, PIPE_VBLANK_INTERRUPT_ENABLE);
 344
 345         if (dev->vblank[1].enabled)
 346                 psb_disable_pipestat(dev_priv, 1, PIPE_VBLANK_INTERRUPT_ENABLE);
 347
 348         if (dev->vblank[2].enabled)
 349                 psb_disable_pipestat(dev_priv, 2, PIPE_VBLANK_INTERRUPT_ENABLE);
 350
 351         dev_priv->vdc_irq_mask &= _PSB_IRQ_SGX_FLAG |
 352                                   _PSB_IRQ_MSVDX_FLAG |
 353                                   _LNC_IRQ_TOPAZ_FLAG;
 354
 355         /* These two registers are safe even if display island is off */
 356         PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
 357         PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
 358
 359         wmb();
 360
 361         /* This register is safe even if display island is off */
 362         PSB_WVDC32(PSB_RVDC32(PSB_INT_IDENTITY_R), PSB_INT_IDENTITY_R);
 363         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 364 }
 365
 366 void psb_irq_turn_on_dpst(struct drm_device *dev)
 367 {
 368         struct drm_psb_private *dev_priv =
 369                 (struct drm_psb_private *) dev->dev_private;
 370         u32 hist_reg;
 371         u32 pwm_reg;
 372
 373         if (gma_power_begin(dev, false)) {
 374                 PSB_WVDC32(1 << 31, HISTOGRAM_LOGIC_CONTROL);
 375                 hist_reg = PSB_RVDC32(HISTOGRAM_LOGIC_CONTROL);
 376                 PSB_WVDC32(1 << 31, HISTOGRAM_INT_CONTROL);
 377                 hist_reg = PSB_RVDC32(HISTOGRAM_INT_CONTROL);
 378
 379                 PSB_WVDC32(0x80010100, PWM_CONTROL_LOGIC);
 380                 pwm_reg = PSB_RVDC32(PWM_CONTROL_LOGIC);
 381                 PSB_WVDC32(pwm_reg | PWM_PHASEIN_ENABLE
 382                                                 | PWM_PHASEIN_INT_ENABLE,
 383                                                            PWM_CONTROL_LOGIC);
 384                 pwm_reg = PSB_RVDC32(PWM_CONTROL_LOGIC);
 385
 386                 psb_enable_pipestat(dev_priv, 0, PIPE_DPST_EVENT_ENABLE);
 387
 388                 hist_reg = PSB_RVDC32(HISTOGRAM_INT_CONTROL);
 389                 PSB_WVDC32(hist_reg | HISTOGRAM_INT_CTRL_CLEAR,
 390                                                         HISTOGRAM_INT_CONTROL);
 391                 pwm_reg = PSB_RVDC32(PWM_CONTROL_LOGIC);
 392                 PSB_WVDC32(pwm_reg | 0x80010100 | PWM_PHASEIN_ENABLE,
 393                                                         PWM_CONTROL_LOGIC);
 394
 395                 gma_power_end(dev);
 396         }
 397 }
 398
 399 int psb_irq_enable_dpst(struct drm_device *dev)
 400 {
 401         struct drm_psb_private *dev_priv =
 402                 (struct drm_psb_private *) dev->dev_private;
 403         unsigned long irqflags;
 404
 405         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 406
 407         /* enable DPST */
 408         mid_enable_pipe_event(dev_priv, 0);
 409         psb_irq_turn_on_dpst(dev);
 410
 411         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 412         return 0;
 413 }
 414
 415 void psb_irq_turn_off_dpst(struct drm_device *dev)
 416 {
 417         struct drm_psb_private *dev_priv =
 418             (struct drm_psb_private *) dev->dev_private;
 419         u32 hist_reg;
 420         u32 pwm_reg;
 421
 422         if (gma_power_begin(dev, false)) {
 423                 PSB_WVDC32(0x00000000, HISTOGRAM_INT_CONTROL);
 424                 hist_reg = PSB_RVDC32(HISTOGRAM_INT_CONTROL);
 425
 426                 psb_disable_pipestat(dev_priv, 0, PIPE_DPST_EVENT_ENABLE);
 427
 428                 pwm_reg = PSB_RVDC32(PWM_CONTROL_LOGIC);
 429                 PSB_WVDC32(pwm_reg & ~PWM_PHASEIN_INT_ENABLE,
 430                                                         PWM_CONTROL_LOGIC);
 431                 pwm_reg = PSB_RVDC32(PWM_CONTROL_LOGIC);
 432
 433                 gma_power_end(dev);
 434         }
 435 }
 436
 437 int psb_irq_disable_dpst(struct drm_device *dev)
 438 {
 439         struct drm_psb_private *dev_priv =
 440             (struct drm_psb_private *) dev->dev_private;
 441         unsigned long irqflags;
 442
 443         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 444
 445         mid_disable_pipe_event(dev_priv, 0);
 446         psb_irq_turn_off_dpst(dev);
 447
 448         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 449
 450         return 0;
 451 }
 452
 453 /*
 454  * It is used to enable VBLANK interrupt
 455  */
 456 int psb_enable_vblank(struct drm_device *dev, int pipe)
 457 {
 458         struct drm_psb_private *dev_priv = dev->dev_private;
 459         unsigned long irqflags;
 460         uint32_t reg_val = 0;
 461         uint32_t pipeconf_reg = mid_pipeconf(pipe);
 462
 463         /* Medfield is different - we should perhaps extract out vblank
 464            and blacklight etc ops */
 465         if (IS_MFLD(dev))
 466                 return mdfld_enable_te(dev, pipe);
 467
 468         if (gma_power_begin(dev, false)) {
 469                 reg_val = REG_READ(pipeconf_reg);
 470                 gma_power_end(dev);
 471         }
 472
 473         if (!(reg_val & PIPEACONF_ENABLE))
 474                 return -EINVAL;
 475
 476         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 477
 478         if (pipe == 0)
 479                 dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEA_FLAG;
 480         else if (pipe == 1)
 481                 dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEB_FLAG;
 482
 483         PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
 484         PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
 485         psb_enable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_ENABLE);
 486
 487         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 488
 489         return 0;
 490 }
 491
 492 /*
 493  * It is used to disable VBLANK interrupt
 494  */
 495 void psb_disable_vblank(struct drm_device *dev, int pipe)
 496 {
 497         struct drm_psb_private *dev_priv = dev->dev_private;
 498         unsigned long irqflags;
 499
 500         if (IS_MFLD(dev))
 501                 mdfld_disable_te(dev, pipe);
 502         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 503
 504         if (pipe == 0)
 505                 dev_priv->vdc_irq_mask &= ~_PSB_VSYNC_PIPEA_FLAG;
 506         else if (pipe == 1)
 507                 dev_priv->vdc_irq_mask &= ~_PSB_VSYNC_PIPEB_FLAG;
 508
 509         PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
 510         PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
 511         psb_disable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_ENABLE);
 512
 513         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 514 }
 515
 516 /*
 517  * It is used to enable TE interrupt
 518  */
 519 int mdfld_enable_te(struct drm_device *dev, int pipe)
 520 {
 521         struct drm_psb_private *dev_priv =
 522                 (struct drm_psb_private *) dev->dev_private;
 523         unsigned long irqflags;
 524         uint32_t reg_val = 0;
 525         uint32_t pipeconf_reg = mid_pipeconf(pipe);
 526
 527         if (gma_power_begin(dev, false)) {
 528                 reg_val = REG_READ(pipeconf_reg);
 529                 gma_power_end(dev);
 530         }
 531
 532         if (!(reg_val & PIPEACONF_ENABLE))
 533                 return -EINVAL;
 534
 535         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 536
 537         mid_enable_pipe_event(dev_priv, pipe);
 538         psb_enable_pipestat(dev_priv, pipe, PIPE_TE_ENABLE);
 539
 540         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 541
 542         return 0;
 543 }
 544
 545 /*
 546  * It is used to disable TE interrupt
 547  */
 548 void mdfld_disable_te(struct drm_device *dev, int pipe)
 549 {
 550         struct drm_psb_private *dev_priv =
 551                 (struct drm_psb_private *) dev->dev_private;
 552         unsigned long irqflags;
 553
 554         if (!dev_priv->dsr_enable)
 555                 return;
 556
 557         spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 558
 559         mid_disable_pipe_event(dev_priv, pipe);
 560         psb_disable_pipestat(dev_priv, pipe, PIPE_TE_ENABLE);
 561
 562         spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
 563 }
 564
 565 /* Called from drm generic code, passed a 'crtc', which
 566  * we use as a pipe index
 567  */
 568 u32 psb_get_vblank_counter(struct drm_device *dev, int pipe)
 569 {
 570         uint32_t high_frame = PIPEAFRAMEHIGH;
 571         uint32_t low_frame = PIPEAFRAMEPIXEL;
 572         uint32_t pipeconf_reg = PIPEACONF;
 573         uint32_t reg_val = 0;
 574         uint32_t high1 = 0, high2 = 0, low = 0, count = 0;
 575
 576         switch (pipe) {
 577         case 0:
 578                 break;
 579         case 1:
 580                 high_frame = PIPEBFRAMEHIGH;
 581                 low_frame = PIPEBFRAMEPIXEL;
 582                 pipeconf_reg = PIPEBCONF;
 583                 break;
 584         case 2:
 585                 high_frame = PIPECFRAMEHIGH;
 586                 low_frame = PIPECFRAMEPIXEL;
 587                 pipeconf_reg = PIPECCONF;
 588                 break;
 589         default:
 590                 dev_err(dev->dev, "%s, invalid pipe.\n", __func__);
 591                 return 0;
 592         }
 593
 594         if (!gma_power_begin(dev, false))
 595                 return 0;
 596
 597         reg_val = REG_READ(pipeconf_reg);
 598
 599         if (!(reg_val & PIPEACONF_ENABLE)) {
 600                 dev_err(dev->dev, "trying to get vblank count for disabled pipe %d\n",
 601                                                                 pipe);
 602                 goto psb_get_vblank_counter_exit;
 603         }
 604
 605         /*
 606          * High & low register fields aren't synchronized, so make sure
 607          * we get a low value that's stable across two reads of the high
 608          * register.
 609          */
 610         do {
 611                 high1 = ((REG_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 612                          PIPE_FRAME_HIGH_SHIFT);
 613                 low =  ((REG_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
 614                         PIPE_FRAME_LOW_SHIFT);
 615                 high2 = ((REG_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 616                          PIPE_FRAME_HIGH_SHIFT);
 617         } while (high1 != high2);
 618
 619         count = (high1 << 8) | low;
 620
 621 psb_get_vblank_counter_exit:
 622
 623         gma_power_end(dev);
 624
 625         return count;
 626 }
 627