drivers/gpu/drm/i915/intel_psr.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * DOC: Panel Self Refresh (PSR/SRD)
  26  *
  27  * Since Haswell Display controller supports Panel Self-Refresh on display
  28  * panels witch have a remote frame buffer (RFB) implemented according to PSR
  29  * spec in eDP1.3. PSR feature allows the display to go to lower standby states
  30  * when system is idle but display is on as it eliminates display refresh
  31  * request to DDR memory completely as long as the frame buffer for that
  32  * display is unchanged.
  33  *
  34  * Panel Self Refresh must be supported by both Hardware (source) and
  35  * Panel (sink).
  36  *
  37  * PSR saves power by caching the framebuffer in the panel RFB, which allows us
  38  * to power down the link and memory controller. For DSI panels the same idea
  39  * is called "manual mode".
  40  *
  41  * The implementation uses the hardware-based PSR support which automatically
  42  * enters/exits self-refresh mode. The hardware takes care of sending the
  43  * required DP aux message and could even retrain the link (that part isn't
  44  * enabled yet though). The hardware also keeps track of any frontbuffer
  45  * changes to know when to exit self-refresh mode again. Unfortunately that
  46  * part doesn't work too well, hence why the i915 PSR support uses the
  47  * software frontbuffer tracking to make sure it doesn't miss a screen
  48  * update. For this integration intel_psr_invalidate() and intel_psr_flush()
  49  * get called by the frontbuffer tracking code. Note that because of locking
  50  * issues the self-refresh re-enable code is done from a work queue, which
  51  * must be correctly synchronized/cancelled when shutting down the pipe."
  52  */
  53
  54 #include <drm/drmP.h>
  55
  56 #include "intel_drv.h"
  57 #include "i915_drv.h"
  58
  59 static bool is_edp_psr(struct intel_dp *intel_dp)
  60 {
  61         return intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED;
  62 }
  63
  64 static bool vlv_is_psr_active_on_pipe(struct drm_device *dev, int pipe)
  65 {
  66         struct drm_i915_private *dev_priv = dev->dev_private;
  67         uint32_t val;
  68
  69         val = I915_READ(VLV_PSRSTAT(pipe)) &
  70               VLV_EDP_PSR_CURR_STATE_MASK;
  71         return (val == VLV_EDP_PSR_ACTIVE_NORFB_UP) ||
  72                (val == VLV_EDP_PSR_ACTIVE_SF_UPDATE);
  73 }
  74
  75 static void intel_psr_write_vsc(struct intel_dp *intel_dp,
  76                                 const struct edp_vsc_psr *vsc_psr)
  77 {
  78         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
  79         struct drm_device *dev = dig_port->base.base.dev;
  80         struct drm_i915_private *dev_priv = dev->dev_private;
  81         struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
  82         enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;
  83         i915_reg_t ctl_reg = HSW_TVIDEO_DIP_CTL(cpu_transcoder);
  84         uint32_t *data = (uint32_t *) vsc_psr;
  85         unsigned int i;
  86
  87         /* As per BSPec (Pipe Video Data Island Packet), we need to disable
  88            the video DIP being updated before program video DIP data buffer
  89            registers for DIP being updated. */
  90         I915_WRITE(ctl_reg, 0);
  91         POSTING_READ(ctl_reg);
  92
  93         for (i = 0; i < sizeof(*vsc_psr); i += 4) {
  94                 I915_WRITE(HSW_TVIDEO_DIP_VSC_DATA(cpu_transcoder,
  95                                                    i >> 2), *data);
  96                 data++;
  97         }
  98         for (; i < VIDEO_DIP_VSC_DATA_SIZE; i += 4)
  99                 I915_WRITE(HSW_TVIDEO_DIP_VSC_DATA(cpu_transcoder,
 100                                                    i >> 2), 0);
 101
 102         I915_WRITE(ctl_reg, VIDEO_DIP_ENABLE_VSC_HSW);
 103         POSTING_READ(ctl_reg);
 104 }
 105
 106 static void vlv_psr_setup_vsc(struct intel_dp *intel_dp)
 107 {
 108         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 109         struct drm_device *dev = intel_dig_port->base.base.dev;
 110         struct drm_i915_private *dev_priv = dev->dev_private;
 111         struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
 112         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 113         uint32_t val;
 114
 115         /* VLV auto-generate VSC package as per EDP 1.3 spec, Table 3.10 */
 116         val  = I915_READ(VLV_VSCSDP(pipe));
 117         val &= ~VLV_EDP_PSR_SDP_FREQ_MASK;
 118         val |= VLV_EDP_PSR_SDP_FREQ_EVFRAME;
 119         I915_WRITE(VLV_VSCSDP(pipe), val);
 120 }
 121
 122 static void skl_psr_setup_su_vsc(struct intel_dp *intel_dp)
 123 {
 124         struct edp_vsc_psr psr_vsc;
 125
 126         /* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
 127         memset(&psr_vsc, 0, sizeof(psr_vsc));
 128         psr_vsc.sdp_header.HB0 = 0;
 129         psr_vsc.sdp_header.HB1 = 0x7;
 130         psr_vsc.sdp_header.HB2 = 0x3;
 131         psr_vsc.sdp_header.HB3 = 0xb;
 132         intel_psr_write_vsc(intel_dp, &psr_vsc);
 133 }
 134
 135 static void hsw_psr_setup_vsc(struct intel_dp *intel_dp)
 136 {
 137         struct edp_vsc_psr psr_vsc;
 138
 139         /* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
 140         memset(&psr_vsc, 0, sizeof(psr_vsc));
 141         psr_vsc.sdp_header.HB0 = 0;
 142         psr_vsc.sdp_header.HB1 = 0x7;
 143         psr_vsc.sdp_header.HB2 = 0x2;
 144         psr_vsc.sdp_header.HB3 = 0x8;
 145         intel_psr_write_vsc(intel_dp, &psr_vsc);
 146 }
 147
 148 static void vlv_psr_enable_sink(struct intel_dp *intel_dp)
 149 {
 150         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
 151                            DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
 152 }
 153
 154 static i915_reg_t psr_aux_ctl_reg(struct drm_i915_private *dev_priv,
 155                                        enum port port)
 156 {
 157         if (INTEL_INFO(dev_priv)->gen >= 9)
 158                 return DP_AUX_CH_CTL(port);
 159         else
 160                 return EDP_PSR_AUX_CTL;
 161 }
 162
 163 static i915_reg_t psr_aux_data_reg(struct drm_i915_private *dev_priv,
 164                                         enum port port, int index)
 165 {
 166         if (INTEL_INFO(dev_priv)->gen >= 9)
 167                 return DP_AUX_CH_DATA(port, index);
 168         else
 169                 return EDP_PSR_AUX_DATA(index);
 170 }
 171
 172 static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
 173 {
 174         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 175         struct drm_device *dev = dig_port->base.base.dev;
 176         struct drm_i915_private *dev_priv = dev->dev_private;
 177         uint32_t aux_clock_divider;
 178         i915_reg_t aux_ctl_reg;
 179         int precharge = 0x3;
 180         static const uint8_t aux_msg[] = {
 181                 [0] = DP_AUX_NATIVE_WRITE << 4,
 182                 [1] = DP_SET_POWER >> 8,
 183                 [2] = DP_SET_POWER & 0xff,
 184                 [3] = 1 - 1,
 185                 [4] = DP_SET_POWER_D0,
 186         };
 187         enum port port = dig_port->port;
 188         int i;
 189
 190         BUILD_BUG_ON(sizeof(aux_msg) > 20);
 191
 192         aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
 193
 194         /* Enable AUX frame sync at sink */
 195         if (dev_priv->psr.aux_frame_sync)
 196                 drm_dp_dpcd_writeb(&intel_dp->aux,
 197                                 DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
 198                                 DP_AUX_FRAME_SYNC_ENABLE);
 199
 200         aux_ctl_reg = psr_aux_ctl_reg(dev_priv, port);
 201
 202         /* Setup AUX registers */
 203         for (i = 0; i < sizeof(aux_msg); i += 4)
 204                 I915_WRITE(psr_aux_data_reg(dev_priv, port, i >> 2),
 205                            intel_dp_pack_aux(&aux_msg[i], sizeof(aux_msg) - i));
 206
 207         if (INTEL_INFO(dev)->gen >= 9) {
 208                 uint32_t val;
 209
 210                 val = I915_READ(aux_ctl_reg);
 211                 val &= ~DP_AUX_CH_CTL_TIME_OUT_MASK;
 212                 val |= DP_AUX_CH_CTL_TIME_OUT_1600us;
 213                 val &= ~DP_AUX_CH_CTL_MESSAGE_SIZE_MASK;
 214                 val |= (sizeof(aux_msg) << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
 215                 /* Use hardcoded data values for PSR, frame sync and GTC */
 216                 val &= ~DP_AUX_CH_CTL_PSR_DATA_AUX_REG_SKL;
 217                 val &= ~DP_AUX_CH_CTL_FS_DATA_AUX_REG_SKL;
 218                 val &= ~DP_AUX_CH_CTL_GTC_DATA_AUX_REG_SKL;
 219                 I915_WRITE(aux_ctl_reg, val);
 220         } else {
 221                 I915_WRITE(aux_ctl_reg,
 222                    DP_AUX_CH_CTL_TIME_OUT_400us |
 223                    (sizeof(aux_msg) << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
 224                    (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
 225                    (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
 226         }
 227
 228         if (dev_priv->psr.link_standby)
 229                 drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
 230                                    DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
 231         else
 232                 drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
 233                                    DP_PSR_ENABLE);
 234 }
 235
 236 static void vlv_psr_enable_source(struct intel_dp *intel_dp)
 237 {
 238         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 239         struct drm_device *dev = dig_port->base.base.dev;
 240         struct drm_i915_private *dev_priv = dev->dev_private;
 241         struct drm_crtc *crtc = dig_port->base.base.crtc;
 242         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 243
 244         /* Transition from PSR_state 0 to PSR_state 1, i.e. PSR Inactive */
 245         I915_WRITE(VLV_PSRCTL(pipe),
 246                    VLV_EDP_PSR_MODE_SW_TIMER |
 247                    VLV_EDP_PSR_SRC_TRANSMITTER_STATE |
 248                    VLV_EDP_PSR_ENABLE);
 249 }
 250
 251 static void vlv_psr_activate(struct intel_dp *intel_dp)
 252 {
 253         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 254         struct drm_device *dev = dig_port->base.base.dev;
 255         struct drm_i915_private *dev_priv = dev->dev_private;
 256         struct drm_crtc *crtc = dig_port->base.base.crtc;
 257         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 258
 259         /* Let's do the transition from PSR_state 1 to PSR_state 2
 260          * that is PSR transition to active - static frame transmission.
 261          * Then Hardware is responsible for the transition to PSR_state 3
 262          * that is PSR active - no Remote Frame Buffer (RFB) update.
 263          */
 264         I915_WRITE(VLV_PSRCTL(pipe), I915_READ(VLV_PSRCTL(pipe)) |
 265                    VLV_EDP_PSR_ACTIVE_ENTRY);
 266 }
 267
 268 static void hsw_psr_enable_source(struct intel_dp *intel_dp)
 269 {
 270         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 271         struct drm_device *dev = dig_port->base.base.dev;
 272         struct drm_i915_private *dev_priv = dev->dev_private;
 273
 274         uint32_t max_sleep_time = 0x1f;
 275         /*
 276          * Let's respect VBT in case VBT asks a higher idle_frame value.
 277          * Let's use 6 as the minimum to cover all known cases including
 278          * the off-by-one issue that HW has in some cases. Also there are
 279          * cases where sink should be able to train
 280          * with the 5 or 6 idle patterns.
 281          */
 282         uint32_t idle_frames = max(6, dev_priv->vbt.psr.idle_frames);
 283         uint32_t val = 0x0;
 284
 285         if (IS_HASWELL(dev))
 286                 val |= EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
 287
 288         if (dev_priv->psr.link_standby)
 289                 val |= EDP_PSR_LINK_STANDBY;
 290
 291         I915_WRITE(EDP_PSR_CTL, val |
 292                    max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
 293                    idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
 294                    EDP_PSR_ENABLE);
 295
 296         if (dev_priv->psr.psr2_support)
 297                 I915_WRITE(EDP_PSR2_CTL, EDP_PSR2_ENABLE |
 298                                 EDP_SU_TRACK_ENABLE | EDP_PSR2_TP2_TIME_100);
 299 }
 300
 301 static bool intel_psr_match_conditions(struct intel_dp *intel_dp)
 302 {
 303         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 304         struct drm_device *dev = dig_port->base.base.dev;
 305         struct drm_i915_private *dev_priv = dev->dev_private;
 306         struct drm_crtc *crtc = dig_port->base.base.crtc;
 307         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 308
 309         lockdep_assert_held(&dev_priv->psr.lock);
 310         WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 311         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 312
 313         dev_priv->psr.source_ok = false;
 314
 315         /*
 316          * HSW spec explicitly says PSR is tied to port A.
 317          * BDW+ platforms with DDI implementation of PSR have different
 318          * PSR registers per transcoder and we only implement transcoder EDP
 319          * ones. Since by Display design transcoder EDP is tied to port A
 320          * we can safely escape based on the port A.
 321          */
 322         if (HAS_DDI(dev) && dig_port->port != PORT_A) {
 323                 DRM_DEBUG_KMS("PSR condition failed: Port not supported\n");
 324                 return false;
 325         }
 326
 327         if (!i915.enable_psr) {
 328                 DRM_DEBUG_KMS("PSR disable by flag\n");
 329                 return false;
 330         }
 331
 332         if ((IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) &&
 333             !dev_priv->psr.link_standby) {
 334                 DRM_ERROR("PSR condition failed: Link off requested but not supported on this platform\n");
 335                 return false;
 336         }
 337
 338         if (IS_HASWELL(dev) &&
 339             I915_READ(HSW_STEREO_3D_CTL(intel_crtc->config->cpu_transcoder)) &
 340                       S3D_ENABLE) {
 341                 DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
 342                 return false;
 343         }
 344
 345         if (IS_HASWELL(dev) &&
 346             intel_crtc->config->base.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
 347                 DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");
 348                 return false;
 349         }
 350
 351         dev_priv->psr.source_ok = true;
 352         return true;
 353 }
 354
 355 static void intel_psr_activate(struct intel_dp *intel_dp)
 356 {
 357         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 358         struct drm_device *dev = intel_dig_port->base.base.dev;
 359         struct drm_i915_private *dev_priv = dev->dev_private;
 360
 361         WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
 362         WARN_ON(dev_priv->psr.active);
 363         lockdep_assert_held(&dev_priv->psr.lock);
 364
 365         /* Enable/Re-enable PSR on the host */
 366         if (HAS_DDI(dev))
 367                 /* On HSW+ after we enable PSR on source it will activate it
 368                  * as soon as it match configure idle_frame count. So
 369                  * we just actually enable it here on activation time.
 370                  */
 371                 hsw_psr_enable_source(intel_dp);
 372         else
 373                 vlv_psr_activate(intel_dp);
 374
 375         dev_priv->psr.active = true;
 376 }
 377
 378 /**
 379  * intel_psr_enable - Enable PSR
 380  * @intel_dp: Intel DP
 381  *
 382  * This function can only be called after the pipe is fully trained and enabled.
 383  */
 384 void intel_psr_enable(struct intel_dp *intel_dp)
 385 {
 386         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 387         struct drm_device *dev = intel_dig_port->base.base.dev;
 388         struct drm_i915_private *dev_priv = dev->dev_private;
 389         struct intel_crtc *crtc = to_intel_crtc(intel_dig_port->base.base.crtc);
 390
 391         if (!HAS_PSR(dev)) {
 392                 DRM_DEBUG_KMS("PSR not supported on this platform\n");
 393                 return;
 394         }
 395
 396         if (!is_edp_psr(intel_dp)) {
 397                 DRM_DEBUG_KMS("PSR not supported by this panel\n");
 398                 return;
 399         }
 400
 401         mutex_lock(&dev_priv->psr.lock);
 402         if (dev_priv->psr.enabled) {
 403                 DRM_DEBUG_KMS("PSR already in use\n");
 404                 goto unlock;
 405         }
 406
 407         if (!intel_psr_match_conditions(intel_dp))
 408                 goto unlock;
 409
 410         dev_priv->psr.busy_frontbuffer_bits = 0;
 411
 412         if (HAS_DDI(dev)) {
 413                 hsw_psr_setup_vsc(intel_dp);
 414
 415                 if (dev_priv->psr.psr2_support) {
 416                         /* PSR2 is restricted to work with panel resolutions upto 3200x2000 */
 417                         if (crtc->config->pipe_src_w > 3200 ||
 418                                 crtc->config->pipe_src_h > 2000)
 419                                 dev_priv->psr.psr2_support = false;
 420                         else
 421                                 skl_psr_setup_su_vsc(intel_dp);
 422                 }
 423
 424                 /*
 425                  * Per Spec: Avoid continuous PSR exit by masking MEMUP and HPD.
 426                  * Also mask LPSP to avoid dependency on other drivers that
 427                  * might block runtime_pm besides preventing other hw tracking
 428                  * issues now we can rely on frontbuffer tracking.
 429                  */
 430                 I915_WRITE(EDP_PSR_DEBUG_CTL, EDP_PSR_DEBUG_MASK_MEMUP |
 431                            EDP_PSR_DEBUG_MASK_HPD | EDP_PSR_DEBUG_MASK_LPSP);
 432
 433                 /* Enable PSR on the panel */
 434                 hsw_psr_enable_sink(intel_dp);
 435
 436                 if (INTEL_INFO(dev)->gen >= 9)
 437                         intel_psr_activate(intel_dp);
 438         } else {
 439                 vlv_psr_setup_vsc(intel_dp);
 440
 441                 /* Enable PSR on the panel */
 442                 vlv_psr_enable_sink(intel_dp);
 443
 444                 /* On HSW+ enable_source also means go to PSR entry/active
 445                  * state as soon as idle_frame achieved and here would be
 446                  * to soon. However on VLV enable_source just enable PSR
 447                  * but let it on inactive state. So we might do this prior
 448                  * to active transition, i.e. here.
 449                  */
 450                 vlv_psr_enable_source(intel_dp);
 451         }
 452
 453         /*
 454          * FIXME: Activation should happen immediately since this function
 455          * is just called after pipe is fully trained and enabled.
 456          * However on every platform we face issues when first activation
 457          * follows a modeset so quickly.
 458          *     - On VLV/CHV we get bank screen on first activation
 459          *     - On HSW/BDW we get a recoverable frozen screen until next
 460          *       exit-activate sequence.
 461          */
 462         if (INTEL_INFO(dev)->gen < 9)
 463                 schedule_delayed_work(&dev_priv->psr.work,
 464                                       msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
 465
 466         dev_priv->psr.enabled = intel_dp;
 467 unlock:
 468         mutex_unlock(&dev_priv->psr.lock);
 469 }
 470
 471 static void vlv_psr_disable(struct intel_dp *intel_dp)
 472 {
 473         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 474         struct drm_device *dev = intel_dig_port->base.base.dev;
 475         struct drm_i915_private *dev_priv = dev->dev_private;
 476         struct intel_crtc *intel_crtc =
 477                 to_intel_crtc(intel_dig_port->base.base.crtc);
 478         uint32_t val;
 479
 480         if (dev_priv->psr.active) {
 481                 /* Put VLV PSR back to PSR_state 0 that is PSR Disabled. */
 482                 if (wait_for((I915_READ(VLV_PSRSTAT(intel_crtc->pipe)) &
 483                               VLV_EDP_PSR_IN_TRANS) == 0, 1))
 484                         WARN(1, "PSR transition took longer than expected\n");
 485
 486                 val = I915_READ(VLV_PSRCTL(intel_crtc->pipe));
 487                 val &= ~VLV_EDP_PSR_ACTIVE_ENTRY;
 488                 val &= ~VLV_EDP_PSR_ENABLE;
 489                 val &= ~VLV_EDP_PSR_MODE_MASK;
 490                 I915_WRITE(VLV_PSRCTL(intel_crtc->pipe), val);
 491
 492                 dev_priv->psr.active = false;
 493         } else {
 494                 WARN_ON(vlv_is_psr_active_on_pipe(dev, intel_crtc->pipe));
 495         }
 496 }
 497
 498 static void hsw_psr_disable(struct intel_dp *intel_dp)
 499 {
 500         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 501         struct drm_device *dev = intel_dig_port->base.base.dev;
 502         struct drm_i915_private *dev_priv = dev->dev_private;
 503
 504         if (dev_priv->psr.active) {
 505                 I915_WRITE(EDP_PSR_CTL,
 506                            I915_READ(EDP_PSR_CTL) & ~EDP_PSR_ENABLE);
 507
 508                 /* Wait till PSR is idle */
 509                 if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL) &
 510                                EDP_PSR_STATUS_STATE_MASK) == 0, 2000, 10))
 511                         DRM_ERROR("Timed out waiting for PSR Idle State\n");
 512
 513                 dev_priv->psr.active = false;
 514         } else {
 515                 WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
 516         }
 517 }
 518
 519 /**
 520  * intel_psr_disable - Disable PSR
 521  * @intel_dp: Intel DP
 522  *
 523  * This function needs to be called before disabling pipe.
 524  */
 525 void intel_psr_disable(struct intel_dp *intel_dp)
 526 {
 527         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 528         struct drm_device *dev = intel_dig_port->base.base.dev;
 529         struct drm_i915_private *dev_priv = dev->dev_private;
 530
 531         mutex_lock(&dev_priv->psr.lock);
 532         if (!dev_priv->psr.enabled) {
 533                 mutex_unlock(&dev_priv->psr.lock);
 534                 return;
 535         }
 536
 537         /* Disable PSR on Source */
 538         if (HAS_DDI(dev))
 539                 hsw_psr_disable(intel_dp);
 540         else
 541                 vlv_psr_disable(intel_dp);
 542
 543         /* Disable PSR on Sink */
 544         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
 545
 546         dev_priv->psr.enabled = NULL;
 547         mutex_unlock(&dev_priv->psr.lock);
 548
 549         cancel_delayed_work_sync(&dev_priv->psr.work);
 550 }
 551
 552 static void intel_psr_work(struct work_struct *work)
 553 {
 554         struct drm_i915_private *dev_priv =
 555                 container_of(work, typeof(*dev_priv), psr.work.work);
 556         struct intel_dp *intel_dp = dev_priv->psr.enabled;
 557         struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
 558         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 559
 560         /* We have to make sure PSR is ready for re-enable
 561          * otherwise it keeps disabled until next full enable/disable cycle.
 562          * PSR might take some time to get fully disabled
 563          * and be ready for re-enable.
 564          */
 565         if (HAS_DDI(dev_priv->dev)) {
 566                 if (wait_for((I915_READ(EDP_PSR_STATUS_CTL) &
 567                               EDP_PSR_STATUS_STATE_MASK) == 0, 50)) {
 568                         DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
 569                         return;
 570                 }
 571         } else {
 572                 if (wait_for((I915_READ(VLV_PSRSTAT(pipe)) &
 573                               VLV_EDP_PSR_IN_TRANS) == 0, 1)) {
 574                         DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
 575                         return;
 576                 }
 577         }
 578         mutex_lock(&dev_priv->psr.lock);
 579         intel_dp = dev_priv->psr.enabled;
 580
 581         if (!intel_dp)
 582                 goto unlock;
 583
 584         /*
 585          * The delayed work can race with an invalidate hence we need to
 586          * recheck. Since psr_flush first clears this and then reschedules we
 587          * won't ever miss a flush when bailing out here.
 588          */
 589         if (dev_priv->psr.busy_frontbuffer_bits)
 590                 goto unlock;
 591
 592         intel_psr_activate(intel_dp);
 593 unlock:
 594         mutex_unlock(&dev_priv->psr.lock);
 595 }
 596
 597 static void intel_psr_exit(struct drm_device *dev)
 598 {
 599         struct drm_i915_private *dev_priv = dev->dev_private;
 600         struct intel_dp *intel_dp = dev_priv->psr.enabled;
 601         struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
 602         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 603         u32 val;
 604
 605         if (!dev_priv->psr.active)
 606                 return;
 607
 608         if (HAS_DDI(dev)) {
 609                 val = I915_READ(EDP_PSR_CTL);
 610
 611                 WARN_ON(!(val & EDP_PSR_ENABLE));
 612
 613                 I915_WRITE(EDP_PSR_CTL, val & ~EDP_PSR_ENABLE);
 614         } else {
 615                 val = I915_READ(VLV_PSRCTL(pipe));
 616
 617                 /* Here we do the transition from PSR_state 3 to PSR_state 5
 618                  * directly once PSR State 4 that is active with single frame
 619                  * update can be skipped. PSR_state 5 that is PSR exit then
 620                  * Hardware is responsible to transition back to PSR_state 1
 621                  * that is PSR inactive. Same state after
 622                  * vlv_edp_psr_enable_source.
 623                  */
 624                 val &= ~VLV_EDP_PSR_ACTIVE_ENTRY;
 625                 I915_WRITE(VLV_PSRCTL(pipe), val);
 626
 627                 /* Send AUX wake up - Spec says after transitioning to PSR
 628                  * active we have to send AUX wake up by writing 01h in DPCD
 629                  * 600h of sink device.
 630                  * XXX: This might slow down the transition, but without this
 631                  * HW doesn't complete the transition to PSR_state 1 and we
 632                  * never get the screen updated.
 633                  */
 634                 drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
 635                                    DP_SET_POWER_D0);
 636         }
 637
 638         dev_priv->psr.active = false;
 639 }
 640
 641 /**
 642  * intel_psr_single_frame_update - Single Frame Update
 643  * @dev: DRM device
 644  * @frontbuffer_bits: frontbuffer plane tracking bits
 645  *
 646  * Some platforms support a single frame update feature that is used to
 647  * send and update only one frame on Remote Frame Buffer.
 648  * So far it is only implemented for Valleyview and Cherryview because
 649  * hardware requires this to be done before a page flip.
 650  */
 651 void intel_psr_single_frame_update(struct drm_device *dev,
 652                                    unsigned frontbuffer_bits)
 653 {
 654         struct drm_i915_private *dev_priv = dev->dev_private;
 655         struct drm_crtc *crtc;
 656         enum pipe pipe;
 657         u32 val;
 658
 659         /*
 660          * Single frame update is already supported on BDW+ but it requires
 661          * many W/A and it isn't really needed.
 662          */
 663         if (!IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev))
 664                 return;
 665
 666         mutex_lock(&dev_priv->psr.lock);
 667         if (!dev_priv->psr.enabled) {
 668                 mutex_unlock(&dev_priv->psr.lock);
 669                 return;
 670         }
 671
 672         crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
 673         pipe = to_intel_crtc(crtc)->pipe;
 674
 675         if (frontbuffer_bits & INTEL_FRONTBUFFER_ALL_MASK(pipe)) {
 676                 val = I915_READ(VLV_PSRCTL(pipe));
 677
 678                 /*
 679                  * We need to set this bit before writing registers for a flip.
 680                  * This bit will be self-clear when it gets to the PSR active state.
 681                  */
 682                 I915_WRITE(VLV_PSRCTL(pipe), val | VLV_EDP_PSR_SINGLE_FRAME_UPDATE);
 683         }
 684         mutex_unlock(&dev_priv->psr.lock);
 685 }
 686
 687 /**
 688  * intel_psr_invalidate - Invalidade PSR
 689  * @dev: DRM device
 690  * @frontbuffer_bits: frontbuffer plane tracking bits
 691  *
 692  * Since the hardware frontbuffer tracking has gaps we need to integrate
 693  * with the software frontbuffer tracking. This function gets called every
 694  * time frontbuffer rendering starts and a buffer gets dirtied. PSR must be
 695  * disabled if the frontbuffer mask contains a buffer relevant to PSR.
 696  *
 697  * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits."
 698  */
 699 void intel_psr_invalidate(struct drm_device *dev,
 700                           unsigned frontbuffer_bits)
 701 {
 702         struct drm_i915_private *dev_priv = dev->dev_private;
 703         struct drm_crtc *crtc;
 704         enum pipe pipe;
 705
 706         mutex_lock(&dev_priv->psr.lock);
 707         if (!dev_priv->psr.enabled) {
 708                 mutex_unlock(&dev_priv->psr.lock);
 709                 return;
 710         }
 711
 712         crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
 713         pipe = to_intel_crtc(crtc)->pipe;
 714
 715         frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
 716         dev_priv->psr.busy_frontbuffer_bits |= frontbuffer_bits;
 717
 718         if (frontbuffer_bits)
 719                 intel_psr_exit(dev);
 720
 721         mutex_unlock(&dev_priv->psr.lock);
 722 }
 723
 724 /**
 725  * intel_psr_flush - Flush PSR
 726  * @dev: DRM device
 727  * @frontbuffer_bits: frontbuffer plane tracking bits
 728  * @origin: which operation caused the flush
 729  *
 730  * Since the hardware frontbuffer tracking has gaps we need to integrate
 731  * with the software frontbuffer tracking. This function gets called every
 732  * time frontbuffer rendering has completed and flushed out to memory. PSR
 733  * can be enabled again if no other frontbuffer relevant to PSR is dirty.
 734  *
 735  * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits.
 736  */
 737 void intel_psr_flush(struct drm_device *dev,
 738                      unsigned frontbuffer_bits, enum fb_op_origin origin)
 739 {
 740         struct drm_i915_private *dev_priv = dev->dev_private;
 741         struct drm_crtc *crtc;
 742         enum pipe pipe;
 743
 744         mutex_lock(&dev_priv->psr.lock);
 745         if (!dev_priv->psr.enabled) {
 746                 mutex_unlock(&dev_priv->psr.lock);
 747                 return;
 748         }
 749
 750         crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
 751         pipe = to_intel_crtc(crtc)->pipe;
 752
 753         frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
 754         dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
 755
 756         /* By definition flush = invalidate + flush */
 757         if (frontbuffer_bits)
 758                 intel_psr_exit(dev);
 759
 760         if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
 761                 if (!work_busy(&dev_priv->psr.work.work))
 762                         schedule_delayed_work(&dev_priv->psr.work,
 763                                               msecs_to_jiffies(100));
 764         mutex_unlock(&dev_priv->psr.lock);
 765 }
 766
 767 /**
 768  * intel_psr_init - Init basic PSR work and mutex.
 769  * @dev: DRM device
 770  *
 771  * This function is  called only once at driver load to initialize basic
 772  * PSR stuff.
 773  */
 774 void intel_psr_init(struct drm_device *dev)
 775 {
 776         struct drm_i915_private *dev_priv = dev->dev_private;
 777
 778         dev_priv->psr_mmio_base = IS_HASWELL(dev_priv) ?
 779                 HSW_EDP_PSR_BASE : BDW_EDP_PSR_BASE;
 780
 781         /* Set link_standby x link_off defaults */
 782         if (IS_HASWELL(dev) || IS_BROADWELL(dev))
 783                 /* HSW and BDW require workarounds that we don't implement. */
 784                 dev_priv->psr.link_standby = false;
 785         else if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
 786                 /* On VLV and CHV only standby mode is supported. */
 787                 dev_priv->psr.link_standby = true;
 788         else
 789                 /* For new platforms let's respect VBT back again */
 790                 dev_priv->psr.link_standby = dev_priv->vbt.psr.full_link;
 791
 792         /* Override link_standby x link_off defaults */
 793         if (i915.enable_psr == 2 && !dev_priv->psr.link_standby) {
 794                 DRM_DEBUG_KMS("PSR: Forcing link standby\n");
 795                 dev_priv->psr.link_standby = true;
 796         }
 797         if (i915.enable_psr == 3 && dev_priv->psr.link_standby) {
 798                 DRM_DEBUG_KMS("PSR: Forcing main link off\n");
 799                 dev_priv->psr.link_standby = false;
 800         }
 801
 802         INIT_DELAYED_WORK(&dev_priv->psr.work, intel_psr_work);
 803         mutex_init(&dev_priv->psr.lock);
 804 }