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                                     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         u32 ctl_reg = HSW_TVIDEO_DIP_CTL(crtc->config->cpu_transcoder);
  83         u32 data_reg = HSW_TVIDEO_DIP_VSC_DATA(crtc->config->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 < VIDEO_DIP_VSC_DATA_SIZE; i += 4) {
  94                 if (i < sizeof(struct edp_vsc_psr))
  95                         I915_WRITE(data_reg + i, *data++);
  96                 else
  97                         I915_WRITE(data_reg + i, 0);
  98         }
  99
 100         I915_WRITE(ctl_reg, VIDEO_DIP_ENABLE_VSC_HSW);
 101         POSTING_READ(ctl_reg);
 102 }
 103
 104 static void vlv_psr_setup_vsc(struct intel_dp *intel_dp)
 105 {
 106         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 107         struct drm_device *dev = intel_dig_port->base.base.dev;
 108         struct drm_i915_private *dev_priv = dev->dev_private;
 109         struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
 110         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 111         uint32_t val;
 112
 113         /* VLV auto-generate VSC package as per EDP 1.3 spec, Table 3.10 */
 114         val  = I915_READ(VLV_VSCSDP(pipe));
 115         val &= ~VLV_EDP_PSR_SDP_FREQ_MASK;
 116         val |= VLV_EDP_PSR_SDP_FREQ_EVFRAME;
 117         I915_WRITE(VLV_VSCSDP(pipe), val);
 118 }
 119
 120 static void skl_psr_setup_su_vsc(struct intel_dp *intel_dp)
 121 {
 122         struct edp_vsc_psr psr_vsc;
 123
 124         /* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
 125         memset(&psr_vsc, 0, sizeof(psr_vsc));
 126         psr_vsc.sdp_header.HB0 = 0;
 127         psr_vsc.sdp_header.HB1 = 0x7;
 128         psr_vsc.sdp_header.HB2 = 0x3;
 129         psr_vsc.sdp_header.HB3 = 0xb;
 130         intel_psr_write_vsc(intel_dp, &psr_vsc);
 131 }
 132
 133 static void hsw_psr_setup_vsc(struct intel_dp *intel_dp)
 134 {
 135         struct edp_vsc_psr psr_vsc;
 136
 137         /* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
 138         memset(&psr_vsc, 0, sizeof(psr_vsc));
 139         psr_vsc.sdp_header.HB0 = 0;
 140         psr_vsc.sdp_header.HB1 = 0x7;
 141         psr_vsc.sdp_header.HB2 = 0x2;
 142         psr_vsc.sdp_header.HB3 = 0x8;
 143         intel_psr_write_vsc(intel_dp, &psr_vsc);
 144 }
 145
 146 static void vlv_psr_enable_sink(struct intel_dp *intel_dp)
 147 {
 148         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
 149                            DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
 150 }
 151
 152 static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
 153 {
 154         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 155         struct drm_device *dev = dig_port->base.base.dev;
 156         struct drm_i915_private *dev_priv = dev->dev_private;
 157         uint32_t aux_clock_divider;
 158         uint32_t aux_data_reg, aux_ctl_reg;
 159         int precharge = 0x3;
 160         static const uint8_t aux_msg[] = {
 161                 [0] = DP_AUX_NATIVE_WRITE << 4,
 162                 [1] = DP_SET_POWER >> 8,
 163                 [2] = DP_SET_POWER & 0xff,
 164                 [3] = 1 - 1,
 165                 [4] = DP_SET_POWER_D0,
 166         };
 167         int i;
 168
 169         BUILD_BUG_ON(sizeof(aux_msg) > 20);
 170
 171         aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
 172
 173         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
 174                            DP_PSR_ENABLE & ~DP_PSR_MAIN_LINK_ACTIVE);
 175
 176         /* Enable AUX frame sync at sink */
 177         if (dev_priv->psr.aux_frame_sync)
 178                 drm_dp_dpcd_writeb(&intel_dp->aux,
 179                                 DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
 180                                 DP_AUX_FRAME_SYNC_ENABLE);
 181
 182         aux_data_reg = (INTEL_INFO(dev)->gen >= 9) ?
 183                                 DPA_AUX_CH_DATA1 : EDP_PSR_AUX_DATA1(dev);
 184         aux_ctl_reg = (INTEL_INFO(dev)->gen >= 9) ?
 185                                 DPA_AUX_CH_CTL : EDP_PSR_AUX_CTL(dev);
 186
 187         /* Setup AUX registers */
 188         for (i = 0; i < sizeof(aux_msg); i += 4)
 189                 I915_WRITE(aux_data_reg + i,
 190                            intel_dp_pack_aux(&aux_msg[i], sizeof(aux_msg) - i));
 191
 192         if (INTEL_INFO(dev)->gen >= 9) {
 193                 uint32_t val;
 194
 195                 val = I915_READ(aux_ctl_reg);
 196                 val &= ~DP_AUX_CH_CTL_TIME_OUT_MASK;
 197                 val |= DP_AUX_CH_CTL_TIME_OUT_1600us;
 198                 val &= ~DP_AUX_CH_CTL_MESSAGE_SIZE_MASK;
 199                 val |= (sizeof(aux_msg) << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
 200                 /* Use hardcoded data values for PSR, frame sync and GTC */
 201                 val &= ~DP_AUX_CH_CTL_PSR_DATA_AUX_REG_SKL;
 202                 val &= ~DP_AUX_CH_CTL_FS_DATA_AUX_REG_SKL;
 203                 val &= ~DP_AUX_CH_CTL_GTC_DATA_AUX_REG_SKL;
 204                 I915_WRITE(aux_ctl_reg, val);
 205         } else {
 206                 I915_WRITE(aux_ctl_reg,
 207                    DP_AUX_CH_CTL_TIME_OUT_400us |
 208                    (sizeof(aux_msg) << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
 209                    (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
 210                    (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
 211         }
 212
 213         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, DP_PSR_ENABLE);
 214 }
 215
 216 static void vlv_psr_enable_source(struct intel_dp *intel_dp)
 217 {
 218         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 219         struct drm_device *dev = dig_port->base.base.dev;
 220         struct drm_i915_private *dev_priv = dev->dev_private;
 221         struct drm_crtc *crtc = dig_port->base.base.crtc;
 222         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 223
 224         /* Transition from PSR_state 0 to PSR_state 1, i.e. PSR Inactive */
 225         I915_WRITE(VLV_PSRCTL(pipe),
 226                    VLV_EDP_PSR_MODE_SW_TIMER |
 227                    VLV_EDP_PSR_SRC_TRANSMITTER_STATE |
 228                    VLV_EDP_PSR_ENABLE);
 229 }
 230
 231 static void vlv_psr_activate(struct intel_dp *intel_dp)
 232 {
 233         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 234         struct drm_device *dev = dig_port->base.base.dev;
 235         struct drm_i915_private *dev_priv = dev->dev_private;
 236         struct drm_crtc *crtc = dig_port->base.base.crtc;
 237         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 238
 239         /* Let's do the transition from PSR_state 1 to PSR_state 2
 240          * that is PSR transition to active - static frame transmission.
 241          * Then Hardware is responsible for the transition to PSR_state 3
 242          * that is PSR active - no Remote Frame Buffer (RFB) update.
 243          */
 244         I915_WRITE(VLV_PSRCTL(pipe), I915_READ(VLV_PSRCTL(pipe)) |
 245                    VLV_EDP_PSR_ACTIVE_ENTRY);
 246 }
 247
 248 static void hsw_psr_enable_source(struct intel_dp *intel_dp)
 249 {
 250         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 251         struct drm_device *dev = dig_port->base.base.dev;
 252         struct drm_i915_private *dev_priv = dev->dev_private;
 253
 254         uint32_t max_sleep_time = 0x1f;
 255         /* Lately it was identified that depending on panel idle frame count
 256          * calculated at HW can be off by 1. So let's use what came
 257          * from VBT + 1.
 258          * There are also other cases where panel demands at least 4
 259          * but VBT is not being set. To cover these 2 cases lets use
 260          * at least 5 when VBT isn't set to be on the safest side.
 261          */
 262         uint32_t idle_frames = dev_priv->vbt.psr.idle_frames ?
 263                                dev_priv->vbt.psr.idle_frames + 1 : 5;
 264         uint32_t val = 0x0;
 265         const uint32_t link_entry_time = EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
 266
 267         if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT) {
 268                 /* It doesn't mean we shouldn't send TPS patters, so let's
 269                    send the minimal TP1 possible and skip TP2. */
 270                 val |= EDP_PSR_TP1_TIME_100us;
 271                 val |= EDP_PSR_TP2_TP3_TIME_0us;
 272                 val |= EDP_PSR_SKIP_AUX_EXIT;
 273                 /* Sink should be able to train with the 5 or 6 idle patterns */
 274                 idle_frames += 4;
 275         }
 276
 277         I915_WRITE(EDP_PSR_CTL(dev), val |
 278                    (IS_BROADWELL(dev) ? 0 : link_entry_time) |
 279                    max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
 280                    idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
 281                    EDP_PSR_ENABLE);
 282
 283         if (dev_priv->psr.psr2_support)
 284                 I915_WRITE(EDP_PSR2_CTL, EDP_PSR2_ENABLE |
 285                                 EDP_SU_TRACK_ENABLE | EDP_PSR2_TP2_TIME_100);
 286 }
 287
 288 static bool intel_psr_match_conditions(struct intel_dp *intel_dp)
 289 {
 290         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 291         struct drm_device *dev = dig_port->base.base.dev;
 292         struct drm_i915_private *dev_priv = dev->dev_private;
 293         struct drm_crtc *crtc = dig_port->base.base.crtc;
 294         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 295
 296         lockdep_assert_held(&dev_priv->psr.lock);
 297         WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 298         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 299
 300         dev_priv->psr.source_ok = false;
 301
 302         if (IS_HASWELL(dev) && dig_port->port != PORT_A) {
 303                 DRM_DEBUG_KMS("HSW ties PSR to DDI A (eDP)\n");
 304                 return false;
 305         }
 306
 307         if (!i915.enable_psr) {
 308                 DRM_DEBUG_KMS("PSR disable by flag\n");
 309                 return false;
 310         }
 311
 312         if (IS_HASWELL(dev) &&
 313             I915_READ(HSW_STEREO_3D_CTL(intel_crtc->config->cpu_transcoder)) &
 314                       S3D_ENABLE) {
 315                 DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
 316                 return false;
 317         }
 318
 319         if (IS_HASWELL(dev) &&
 320             intel_crtc->config->base.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
 321                 DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");
 322                 return false;
 323         }
 324
 325         if (!IS_VALLEYVIEW(dev) && ((dev_priv->vbt.psr.full_link) ||
 326                                     (dig_port->port != PORT_A))) {
 327                 DRM_DEBUG_KMS("PSR condition failed: Link Standby requested/needed but not supported on this platform\n");
 328                 return false;
 329         }
 330
 331         dev_priv->psr.source_ok = true;
 332         return true;
 333 }
 334
 335 static void intel_psr_activate(struct intel_dp *intel_dp)
 336 {
 337         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 338         struct drm_device *dev = intel_dig_port->base.base.dev;
 339         struct drm_i915_private *dev_priv = dev->dev_private;
 340
 341         WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
 342         WARN_ON(dev_priv->psr.active);
 343         lockdep_assert_held(&dev_priv->psr.lock);
 344
 345         /* Enable/Re-enable PSR on the host */
 346         if (HAS_DDI(dev))
 347                 /* On HSW+ after we enable PSR on source it will activate it
 348                  * as soon as it match configure idle_frame count. So
 349                  * we just actually enable it here on activation time.
 350                  */
 351                 hsw_psr_enable_source(intel_dp);
 352         else
 353                 vlv_psr_activate(intel_dp);
 354
 355         dev_priv->psr.active = true;
 356 }
 357
 358 /**
 359  * intel_psr_enable - Enable PSR
 360  * @intel_dp: Intel DP
 361  *
 362  * This function can only be called after the pipe is fully trained and enabled.
 363  */
 364 void intel_psr_enable(struct intel_dp *intel_dp)
 365 {
 366         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 367         struct drm_device *dev = intel_dig_port->base.base.dev;
 368         struct drm_i915_private *dev_priv = dev->dev_private;
 369         struct intel_crtc *crtc = to_intel_crtc(intel_dig_port->base.base.crtc);
 370
 371         if (!HAS_PSR(dev)) {
 372                 DRM_DEBUG_KMS("PSR not supported on this platform\n");
 373                 return;
 374         }
 375
 376         if (!is_edp_psr(intel_dp)) {
 377                 DRM_DEBUG_KMS("PSR not supported by this panel\n");
 378                 return;
 379         }
 380
 381         mutex_lock(&dev_priv->psr.lock);
 382         if (dev_priv->psr.enabled) {
 383                 DRM_DEBUG_KMS("PSR already in use\n");
 384                 goto unlock;
 385         }
 386
 387         if (!intel_psr_match_conditions(intel_dp))
 388                 goto unlock;
 389
 390         dev_priv->psr.busy_frontbuffer_bits = 0;
 391
 392         if (HAS_DDI(dev)) {
 393                 hsw_psr_setup_vsc(intel_dp);
 394
 395                 if (dev_priv->psr.psr2_support) {
 396                         /* PSR2 is restricted to work with panel resolutions upto 3200x2000 */
 397                         if (crtc->config->pipe_src_w > 3200 ||
 398                                 crtc->config->pipe_src_h > 2000)
 399                                 dev_priv->psr.psr2_support = false;
 400                         else
 401                                 skl_psr_setup_su_vsc(intel_dp);
 402                 }
 403
 404                 /* Avoid continuous PSR exit by masking memup and hpd */
 405                 I915_WRITE(EDP_PSR_DEBUG_CTL(dev), EDP_PSR_DEBUG_MASK_MEMUP |
 406                            EDP_PSR_DEBUG_MASK_HPD);
 407
 408                 /* Enable PSR on the panel */
 409                 hsw_psr_enable_sink(intel_dp);
 410
 411                 if (INTEL_INFO(dev)->gen >= 9)
 412                         intel_psr_activate(intel_dp);
 413         } else {
 414                 vlv_psr_setup_vsc(intel_dp);
 415
 416                 /* Enable PSR on the panel */
 417                 vlv_psr_enable_sink(intel_dp);
 418
 419                 /* On HSW+ enable_source also means go to PSR entry/active
 420                  * state as soon as idle_frame achieved and here would be
 421                  * to soon. However on VLV enable_source just enable PSR
 422                  * but let it on inactive state. So we might do this prior
 423                  * to active transition, i.e. here.
 424                  */
 425                 vlv_psr_enable_source(intel_dp);
 426         }
 427
 428         dev_priv->psr.enabled = intel_dp;
 429 unlock:
 430         mutex_unlock(&dev_priv->psr.lock);
 431 }
 432
 433 static void vlv_psr_disable(struct intel_dp *intel_dp)
 434 {
 435         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 436         struct drm_device *dev = intel_dig_port->base.base.dev;
 437         struct drm_i915_private *dev_priv = dev->dev_private;
 438         struct intel_crtc *intel_crtc =
 439                 to_intel_crtc(intel_dig_port->base.base.crtc);
 440         uint32_t val;
 441
 442         if (dev_priv->psr.active) {
 443                 /* Put VLV PSR back to PSR_state 0 that is PSR Disabled. */
 444                 if (wait_for((I915_READ(VLV_PSRSTAT(intel_crtc->pipe)) &
 445                               VLV_EDP_PSR_IN_TRANS) == 0, 1))
 446                         WARN(1, "PSR transition took longer than expected\n");
 447
 448                 val = I915_READ(VLV_PSRCTL(intel_crtc->pipe));
 449                 val &= ~VLV_EDP_PSR_ACTIVE_ENTRY;
 450                 val &= ~VLV_EDP_PSR_ENABLE;
 451                 val &= ~VLV_EDP_PSR_MODE_MASK;
 452                 I915_WRITE(VLV_PSRCTL(intel_crtc->pipe), val);
 453
 454                 dev_priv->psr.active = false;
 455         } else {
 456                 WARN_ON(vlv_is_psr_active_on_pipe(dev, intel_crtc->pipe));
 457         }
 458 }
 459
 460 static void hsw_psr_disable(struct intel_dp *intel_dp)
 461 {
 462         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 463         struct drm_device *dev = intel_dig_port->base.base.dev;
 464         struct drm_i915_private *dev_priv = dev->dev_private;
 465
 466         if (dev_priv->psr.active) {
 467                 I915_WRITE(EDP_PSR_CTL(dev),
 468                            I915_READ(EDP_PSR_CTL(dev)) & ~EDP_PSR_ENABLE);
 469
 470                 /* Wait till PSR is idle */
 471                 if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev)) &
 472                                EDP_PSR_STATUS_STATE_MASK) == 0, 2000, 10))
 473                         DRM_ERROR("Timed out waiting for PSR Idle State\n");
 474
 475                 dev_priv->psr.active = false;
 476         } else {
 477                 WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
 478         }
 479 }
 480
 481 /**
 482  * intel_psr_disable - Disable PSR
 483  * @intel_dp: Intel DP
 484  *
 485  * This function needs to be called before disabling pipe.
 486  */
 487 void intel_psr_disable(struct intel_dp *intel_dp)
 488 {
 489         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 490         struct drm_device *dev = intel_dig_port->base.base.dev;
 491         struct drm_i915_private *dev_priv = dev->dev_private;
 492
 493         mutex_lock(&dev_priv->psr.lock);
 494         if (!dev_priv->psr.enabled) {
 495                 mutex_unlock(&dev_priv->psr.lock);
 496                 return;
 497         }
 498
 499         if (HAS_DDI(dev))
 500                 hsw_psr_disable(intel_dp);
 501         else
 502                 vlv_psr_disable(intel_dp);
 503
 504         dev_priv->psr.enabled = NULL;
 505         mutex_unlock(&dev_priv->psr.lock);
 506
 507         cancel_delayed_work_sync(&dev_priv->psr.work);
 508 }
 509
 510 static void intel_psr_work(struct work_struct *work)
 511 {
 512         struct drm_i915_private *dev_priv =
 513                 container_of(work, typeof(*dev_priv), psr.work.work);
 514         struct intel_dp *intel_dp = dev_priv->psr.enabled;
 515         struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
 516         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 517
 518         /* We have to make sure PSR is ready for re-enable
 519          * otherwise it keeps disabled until next full enable/disable cycle.
 520          * PSR might take some time to get fully disabled
 521          * and be ready for re-enable.
 522          */
 523         if (HAS_DDI(dev_priv->dev)) {
 524                 if (wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev_priv->dev)) &
 525                               EDP_PSR_STATUS_STATE_MASK) == 0, 50)) {
 526                         DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
 527                         return;
 528                 }
 529         } else {
 530                 if (wait_for((I915_READ(VLV_PSRSTAT(pipe)) &
 531                               VLV_EDP_PSR_IN_TRANS) == 0, 1)) {
 532                         DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
 533                         return;
 534                 }
 535         }
 536         mutex_lock(&dev_priv->psr.lock);
 537         intel_dp = dev_priv->psr.enabled;
 538
 539         if (!intel_dp)
 540                 goto unlock;
 541
 542         /*
 543          * The delayed work can race with an invalidate hence we need to
 544          * recheck. Since psr_flush first clears this and then reschedules we
 545          * won't ever miss a flush when bailing out here.
 546          */
 547         if (dev_priv->psr.busy_frontbuffer_bits)
 548                 goto unlock;
 549
 550         intel_psr_activate(intel_dp);
 551 unlock:
 552         mutex_unlock(&dev_priv->psr.lock);
 553 }
 554
 555 static void intel_psr_exit(struct drm_device *dev)
 556 {
 557         struct drm_i915_private *dev_priv = dev->dev_private;
 558         struct intel_dp *intel_dp = dev_priv->psr.enabled;
 559         struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
 560         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 561         u32 val;
 562
 563         if (!dev_priv->psr.active)
 564                 return;
 565
 566         if (HAS_DDI(dev)) {
 567                 val = I915_READ(EDP_PSR_CTL(dev));
 568
 569                 WARN_ON(!(val & EDP_PSR_ENABLE));
 570
 571                 I915_WRITE(EDP_PSR_CTL(dev), val & ~EDP_PSR_ENABLE);
 572         } else {
 573                 val = I915_READ(VLV_PSRCTL(pipe));
 574
 575                 /* Here we do the transition from PSR_state 3 to PSR_state 5
 576                  * directly once PSR State 4 that is active with single frame
 577                  * update can be skipped. PSR_state 5 that is PSR exit then
 578                  * Hardware is responsible to transition back to PSR_state 1
 579                  * that is PSR inactive. Same state after
 580                  * vlv_edp_psr_enable_source.
 581                  */
 582                 val &= ~VLV_EDP_PSR_ACTIVE_ENTRY;
 583                 I915_WRITE(VLV_PSRCTL(pipe), val);
 584
 585                 /* Send AUX wake up - Spec says after transitioning to PSR
 586                  * active we have to send AUX wake up by writing 01h in DPCD
 587                  * 600h of sink device.
 588                  * XXX: This might slow down the transition, but without this
 589                  * HW doesn't complete the transition to PSR_state 1 and we
 590                  * never get the screen updated.
 591                  */
 592                 drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
 593                                    DP_SET_POWER_D0);
 594         }
 595
 596         dev_priv->psr.active = false;
 597 }
 598
 599 /**
 600  * intel_psr_single_frame_update - Single Frame Update
 601  * @dev: DRM device
 602  * @frontbuffer_bits: frontbuffer plane tracking bits
 603  *
 604  * Some platforms support a single frame update feature that is used to
 605  * send and update only one frame on Remote Frame Buffer.
 606  * So far it is only implemented for Valleyview and Cherryview because
 607  * hardware requires this to be done before a page flip.
 608  */
 609 void intel_psr_single_frame_update(struct drm_device *dev,
 610                                    unsigned frontbuffer_bits)
 611 {
 612         struct drm_i915_private *dev_priv = dev->dev_private;
 613         struct drm_crtc *crtc;
 614         enum pipe pipe;
 615         u32 val;
 616
 617         /*
 618          * Single frame update is already supported on BDW+ but it requires
 619          * many W/A and it isn't really needed.
 620          */
 621         if (!IS_VALLEYVIEW(dev))
 622                 return;
 623
 624         mutex_lock(&dev_priv->psr.lock);
 625         if (!dev_priv->psr.enabled) {
 626                 mutex_unlock(&dev_priv->psr.lock);
 627                 return;
 628         }
 629
 630         crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
 631         pipe = to_intel_crtc(crtc)->pipe;
 632
 633         if (frontbuffer_bits & INTEL_FRONTBUFFER_ALL_MASK(pipe)) {
 634                 val = I915_READ(VLV_PSRCTL(pipe));
 635
 636                 /*
 637                  * We need to set this bit before writing registers for a flip.
 638                  * This bit will be self-clear when it gets to the PSR active state.
 639                  */
 640                 I915_WRITE(VLV_PSRCTL(pipe), val | VLV_EDP_PSR_SINGLE_FRAME_UPDATE);
 641         }
 642         mutex_unlock(&dev_priv->psr.lock);
 643 }
 644
 645 /**
 646  * intel_psr_invalidate - Invalidade PSR
 647  * @dev: DRM device
 648  * @frontbuffer_bits: frontbuffer plane tracking bits
 649  *
 650  * Since the hardware frontbuffer tracking has gaps we need to integrate
 651  * with the software frontbuffer tracking. This function gets called every
 652  * time frontbuffer rendering starts and a buffer gets dirtied. PSR must be
 653  * disabled if the frontbuffer mask contains a buffer relevant to PSR.
 654  *
 655  * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits."
 656  */
 657 void intel_psr_invalidate(struct drm_device *dev,
 658                           unsigned frontbuffer_bits)
 659 {
 660         struct drm_i915_private *dev_priv = dev->dev_private;
 661         struct drm_crtc *crtc;
 662         enum pipe pipe;
 663
 664         mutex_lock(&dev_priv->psr.lock);
 665         if (!dev_priv->psr.enabled) {
 666                 mutex_unlock(&dev_priv->psr.lock);
 667                 return;
 668         }
 669
 670         crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
 671         pipe = to_intel_crtc(crtc)->pipe;
 672
 673         frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
 674         dev_priv->psr.busy_frontbuffer_bits |= frontbuffer_bits;
 675
 676         if (frontbuffer_bits)
 677                 intel_psr_exit(dev);
 678
 679         mutex_unlock(&dev_priv->psr.lock);
 680 }
 681
 682 /**
 683  * intel_psr_flush - Flush PSR
 684  * @dev: DRM device
 685  * @frontbuffer_bits: frontbuffer plane tracking bits
 686  * @origin: which operation caused the flush
 687  *
 688  * Since the hardware frontbuffer tracking has gaps we need to integrate
 689  * with the software frontbuffer tracking. This function gets called every
 690  * time frontbuffer rendering has completed and flushed out to memory. PSR
 691  * can be enabled again if no other frontbuffer relevant to PSR is dirty.
 692  *
 693  * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits.
 694  */
 695 void intel_psr_flush(struct drm_device *dev,
 696                      unsigned frontbuffer_bits, enum fb_op_origin origin)
 697 {
 698         struct drm_i915_private *dev_priv = dev->dev_private;
 699         struct drm_crtc *crtc;
 700         enum pipe pipe;
 701         int delay_ms = HAS_DDI(dev) ? 100 : 500;
 702
 703         mutex_lock(&dev_priv->psr.lock);
 704         if (!dev_priv->psr.enabled) {
 705                 mutex_unlock(&dev_priv->psr.lock);
 706                 return;
 707         }
 708
 709         crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
 710         pipe = to_intel_crtc(crtc)->pipe;
 711
 712         frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
 713         dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
 714
 715         if (HAS_DDI(dev)) {
 716                 /*
 717                  * By definition every flush should mean invalidate + flush,
 718                  * however on core platforms let's minimize the
 719                  * disable/re-enable so we can avoid the invalidate when flip
 720                  * originated the flush.
 721                  */
 722                 if (frontbuffer_bits && origin != ORIGIN_FLIP)
 723                         intel_psr_exit(dev);
 724         } else {
 725                 /*
 726                  * On Valleyview and Cherryview we don't use hardware tracking
 727                  * so any plane updates or cursor moves don't result in a PSR
 728                  * invalidating. Which means we need to manually fake this in
 729                  * software for all flushes.
 730                  */
 731                 if (frontbuffer_bits)
 732                         intel_psr_exit(dev);
 733         }
 734
 735         if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
 736                 schedule_delayed_work(&dev_priv->psr.work,
 737                                       msecs_to_jiffies(delay_ms));
 738         mutex_unlock(&dev_priv->psr.lock);
 739 }
 740
 741 /**
 742  * intel_psr_init - Init basic PSR work and mutex.
 743  * @dev: DRM device
 744  *
 745  * This function is  called only once at driver load to initialize basic
 746  * PSR stuff.
 747  */
 748 void intel_psr_init(struct drm_device *dev)
 749 {
 750         struct drm_i915_private *dev_priv = dev->dev_private;
 751
 752         INIT_DELAYED_WORK(&dev_priv->psr.work, intel_psr_work);
 753         mutex_init(&dev_priv->psr.lock);
 754 }