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 #include <drm/drm_atomic_helper.h>
  25
  26 #include "display/intel_dp.h"
  27
  28 #include "i915_drv.h"
  29 #include "intel_drv.h"
  30 #include "intel_psr.h"
  31 #include "intel_sprite.h"
  32
  33 /**
  34  * DOC: Panel Self Refresh (PSR/SRD)
  35  *
  36  * Since Haswell Display controller supports Panel Self-Refresh on display
  37  * panels witch have a remote frame buffer (RFB) implemented according to PSR
  38  * spec in eDP1.3. PSR feature allows the display to go to lower standby states
  39  * when system is idle but display is on as it eliminates display refresh
  40  * request to DDR memory completely as long as the frame buffer for that
  41  * display is unchanged.
  42  *
  43  * Panel Self Refresh must be supported by both Hardware (source) and
  44  * Panel (sink).
  45  *
  46  * PSR saves power by caching the framebuffer in the panel RFB, which allows us
  47  * to power down the link and memory controller. For DSI panels the same idea
  48  * is called "manual mode".
  49  *
  50  * The implementation uses the hardware-based PSR support which automatically
  51  * enters/exits self-refresh mode. The hardware takes care of sending the
  52  * required DP aux message and could even retrain the link (that part isn't
  53  * enabled yet though). The hardware also keeps track of any frontbuffer
  54  * changes to know when to exit self-refresh mode again. Unfortunately that
  55  * part doesn't work too well, hence why the i915 PSR support uses the
  56  * software frontbuffer tracking to make sure it doesn't miss a screen
  57  * update. For this integration intel_psr_invalidate() and intel_psr_flush()
  58  * get called by the frontbuffer tracking code. Note that because of locking
  59  * issues the self-refresh re-enable code is done from a work queue, which
  60  * must be correctly synchronized/cancelled when shutting down the pipe."
  61  */
  62
  63 static bool psr_global_enabled(u32 debug)
  64 {
  65         switch (debug & I915_PSR_DEBUG_MODE_MASK) {
  66         case I915_PSR_DEBUG_DEFAULT:
  67                 return i915_modparams.enable_psr;
  68         case I915_PSR_DEBUG_DISABLE:
  69                 return false;
  70         default:
  71                 return true;
  72         }
  73 }
  74
  75 static bool intel_psr2_enabled(struct drm_i915_private *dev_priv,
  76                                const struct intel_crtc_state *crtc_state)
  77 {
  78         /* Cannot enable DSC and PSR2 simultaneously */
  79         WARN_ON(crtc_state->dsc_params.compression_enable &&
  80                 crtc_state->has_psr2);
  81
  82         switch (dev_priv->psr.debug & I915_PSR_DEBUG_MODE_MASK) {
  83         case I915_PSR_DEBUG_DISABLE:
  84         case I915_PSR_DEBUG_FORCE_PSR1:
  85                 return false;
  86         default:
  87                 return crtc_state->has_psr2;
  88         }
  89 }
  90
  91 static int edp_psr_shift(enum transcoder cpu_transcoder)
  92 {
  93         switch (cpu_transcoder) {
  94         case TRANSCODER_A:
  95                 return EDP_PSR_TRANSCODER_A_SHIFT;
  96         case TRANSCODER_B:
  97                 return EDP_PSR_TRANSCODER_B_SHIFT;
  98         case TRANSCODER_C:
  99                 return EDP_PSR_TRANSCODER_C_SHIFT;
 100         default:
 101                 MISSING_CASE(cpu_transcoder);
 102                 /* fallthrough */
 103         case TRANSCODER_EDP:
 104                 return EDP_PSR_TRANSCODER_EDP_SHIFT;
 105         }
 106 }
 107
 108 void intel_psr_irq_control(struct drm_i915_private *dev_priv, u32 debug)
 109 {
 110         u32 debug_mask, mask;
 111         enum transcoder cpu_transcoder;
 112         u32 transcoders = BIT(TRANSCODER_EDP);
 113
 114         if (INTEL_GEN(dev_priv) >= 8)
 115                 transcoders |= BIT(TRANSCODER_A) |
 116                                BIT(TRANSCODER_B) |
 117                                BIT(TRANSCODER_C);
 118
 119         debug_mask = 0;
 120         mask = 0;
 121         for_each_cpu_transcoder_masked(dev_priv, cpu_transcoder, transcoders) {
 122                 int shift = edp_psr_shift(cpu_transcoder);
 123
 124                 mask |= EDP_PSR_ERROR(shift);
 125                 debug_mask |= EDP_PSR_POST_EXIT(shift) |
 126                               EDP_PSR_PRE_ENTRY(shift);
 127         }
 128
 129         if (debug & I915_PSR_DEBUG_IRQ)
 130                 mask |= debug_mask;
 131
 132         I915_WRITE(EDP_PSR_IMR, ~mask);
 133 }
 134
 135 static void psr_event_print(u32 val, bool psr2_enabled)
 136 {
 137         DRM_DEBUG_KMS("PSR exit events: 0x%x\n", val);
 138         if (val & PSR_EVENT_PSR2_WD_TIMER_EXPIRE)
 139                 DRM_DEBUG_KMS("\tPSR2 watchdog timer expired\n");
 140         if ((val & PSR_EVENT_PSR2_DISABLED) && psr2_enabled)
 141                 DRM_DEBUG_KMS("\tPSR2 disabled\n");
 142         if (val & PSR_EVENT_SU_DIRTY_FIFO_UNDERRUN)
 143                 DRM_DEBUG_KMS("\tSU dirty FIFO underrun\n");
 144         if (val & PSR_EVENT_SU_CRC_FIFO_UNDERRUN)
 145                 DRM_DEBUG_KMS("\tSU CRC FIFO underrun\n");
 146         if (val & PSR_EVENT_GRAPHICS_RESET)
 147                 DRM_DEBUG_KMS("\tGraphics reset\n");
 148         if (val & PSR_EVENT_PCH_INTERRUPT)
 149                 DRM_DEBUG_KMS("\tPCH interrupt\n");
 150         if (val & PSR_EVENT_MEMORY_UP)
 151                 DRM_DEBUG_KMS("\tMemory up\n");
 152         if (val & PSR_EVENT_FRONT_BUFFER_MODIFY)
 153                 DRM_DEBUG_KMS("\tFront buffer modification\n");
 154         if (val & PSR_EVENT_WD_TIMER_EXPIRE)
 155                 DRM_DEBUG_KMS("\tPSR watchdog timer expired\n");
 156         if (val & PSR_EVENT_PIPE_REGISTERS_UPDATE)
 157                 DRM_DEBUG_KMS("\tPIPE registers updated\n");
 158         if (val & PSR_EVENT_REGISTER_UPDATE)
 159                 DRM_DEBUG_KMS("\tRegister updated\n");
 160         if (val & PSR_EVENT_HDCP_ENABLE)
 161                 DRM_DEBUG_KMS("\tHDCP enabled\n");
 162         if (val & PSR_EVENT_KVMR_SESSION_ENABLE)
 163                 DRM_DEBUG_KMS("\tKVMR session enabled\n");
 164         if (val & PSR_EVENT_VBI_ENABLE)
 165                 DRM_DEBUG_KMS("\tVBI enabled\n");
 166         if (val & PSR_EVENT_LPSP_MODE_EXIT)
 167                 DRM_DEBUG_KMS("\tLPSP mode exited\n");
 168         if ((val & PSR_EVENT_PSR_DISABLE) && !psr2_enabled)
 169                 DRM_DEBUG_KMS("\tPSR disabled\n");
 170 }
 171
 172 void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir)
 173 {
 174         u32 transcoders = BIT(TRANSCODER_EDP);
 175         enum transcoder cpu_transcoder;
 176         ktime_t time_ns =  ktime_get();
 177         u32 mask = 0;
 178
 179         if (INTEL_GEN(dev_priv) >= 8)
 180                 transcoders |= BIT(TRANSCODER_A) |
 181                                BIT(TRANSCODER_B) |
 182                                BIT(TRANSCODER_C);
 183
 184         for_each_cpu_transcoder_masked(dev_priv, cpu_transcoder, transcoders) {
 185                 int shift = edp_psr_shift(cpu_transcoder);
 186
 187                 if (psr_iir & EDP_PSR_ERROR(shift)) {
 188                         DRM_WARN("[transcoder %s] PSR aux error\n",
 189                                  transcoder_name(cpu_transcoder));
 190
 191                         dev_priv->psr.irq_aux_error = true;
 192
 193                         /*
 194                          * If this interruption is not masked it will keep
 195                          * interrupting so fast that it prevents the scheduled
 196                          * work to run.
 197                          * Also after a PSR error, we don't want to arm PSR
 198                          * again so we don't care about unmask the interruption
 199                          * or unset irq_aux_error.
 200                          */
 201                         mask |= EDP_PSR_ERROR(shift);
 202                 }
 203
 204                 if (psr_iir & EDP_PSR_PRE_ENTRY(shift)) {
 205                         dev_priv->psr.last_entry_attempt = time_ns;
 206                         DRM_DEBUG_KMS("[transcoder %s] PSR entry attempt in 2 vblanks\n",
 207                                       transcoder_name(cpu_transcoder));
 208                 }
 209
 210                 if (psr_iir & EDP_PSR_POST_EXIT(shift)) {
 211                         dev_priv->psr.last_exit = time_ns;
 212                         DRM_DEBUG_KMS("[transcoder %s] PSR exit completed\n",
 213                                       transcoder_name(cpu_transcoder));
 214
 215                         if (INTEL_GEN(dev_priv) >= 9) {
 216                                 u32 val = I915_READ(PSR_EVENT(cpu_transcoder));
 217                                 bool psr2_enabled = dev_priv->psr.psr2_enabled;
 218
 219                                 I915_WRITE(PSR_EVENT(cpu_transcoder), val);
 220                                 psr_event_print(val, psr2_enabled);
 221                         }
 222                 }
 223         }
 224
 225         if (mask) {
 226                 mask |= I915_READ(EDP_PSR_IMR);
 227                 I915_WRITE(EDP_PSR_IMR, mask);
 228
 229                 schedule_work(&dev_priv->psr.work);
 230         }
 231 }
 232
 233 static bool intel_dp_get_alpm_status(struct intel_dp *intel_dp)
 234 {
 235         u8 alpm_caps = 0;
 236
 237         if (drm_dp_dpcd_readb(&intel_dp->aux, DP_RECEIVER_ALPM_CAP,
 238                               &alpm_caps) != 1)
 239                 return false;
 240         return alpm_caps & DP_ALPM_CAP;
 241 }
 242
 243 static u8 intel_dp_get_sink_sync_latency(struct intel_dp *intel_dp)
 244 {
 245         u8 val = 8; /* assume the worst if we can't read the value */
 246
 247         if (drm_dp_dpcd_readb(&intel_dp->aux,
 248                               DP_SYNCHRONIZATION_LATENCY_IN_SINK, &val) == 1)
 249                 val &= DP_MAX_RESYNC_FRAME_COUNT_MASK;
 250         else
 251                 DRM_DEBUG_KMS("Unable to get sink synchronization latency, assuming 8 frames\n");
 252         return val;
 253 }
 254
 255 static u16 intel_dp_get_su_x_granulartiy(struct intel_dp *intel_dp)
 256 {
 257         u16 val;
 258         ssize_t r;
 259
 260         /*
 261          * Returning the default X granularity if granularity not required or
 262          * if DPCD read fails
 263          */
 264         if (!(intel_dp->psr_dpcd[1] & DP_PSR2_SU_GRANULARITY_REQUIRED))
 265                 return 4;
 266
 267         r = drm_dp_dpcd_read(&intel_dp->aux, DP_PSR2_SU_X_GRANULARITY, &val, 2);
 268         if (r != 2)
 269                 DRM_DEBUG_KMS("Unable to read DP_PSR2_SU_X_GRANULARITY\n");
 270
 271         /*
 272          * Spec says that if the value read is 0 the default granularity should
 273          * be used instead.
 274          */
 275         if (r != 2 || val == 0)
 276                 val = 4;
 277
 278         return val;
 279 }
 280
 281 void intel_psr_init_dpcd(struct intel_dp *intel_dp)
 282 {
 283         struct drm_i915_private *dev_priv =
 284                 to_i915(dp_to_dig_port(intel_dp)->base.base.dev);
 285
 286         drm_dp_dpcd_read(&intel_dp->aux, DP_PSR_SUPPORT, intel_dp->psr_dpcd,
 287                          sizeof(intel_dp->psr_dpcd));
 288
 289         if (!intel_dp->psr_dpcd[0])
 290                 return;
 291         DRM_DEBUG_KMS("eDP panel supports PSR version %x\n",
 292                       intel_dp->psr_dpcd[0]);
 293
 294         if (drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_NO_PSR)) {
 295                 DRM_DEBUG_KMS("PSR support not currently available for this panel\n");
 296                 return;
 297         }
 298
 299         if (!(intel_dp->edp_dpcd[1] & DP_EDP_SET_POWER_CAP)) {
 300                 DRM_DEBUG_KMS("Panel lacks power state control, PSR cannot be enabled\n");
 301                 return;
 302         }
 303
 304         dev_priv->psr.sink_support = true;
 305         dev_priv->psr.sink_sync_latency =
 306                 intel_dp_get_sink_sync_latency(intel_dp);
 307
 308         WARN_ON(dev_priv->psr.dp);
 309         dev_priv->psr.dp = intel_dp;
 310
 311         if (INTEL_GEN(dev_priv) >= 9 &&
 312             (intel_dp->psr_dpcd[0] == DP_PSR2_WITH_Y_COORD_IS_SUPPORTED)) {
 313                 bool y_req = intel_dp->psr_dpcd[1] &
 314                              DP_PSR2_SU_Y_COORDINATE_REQUIRED;
 315                 bool alpm = intel_dp_get_alpm_status(intel_dp);
 316
 317                 /*
 318                  * All panels that supports PSR version 03h (PSR2 +
 319                  * Y-coordinate) can handle Y-coordinates in VSC but we are
 320                  * only sure that it is going to be used when required by the
 321                  * panel. This way panel is capable to do selective update
 322                  * without a aux frame sync.
 323                  *
 324                  * To support PSR version 02h and PSR version 03h without
 325                  * Y-coordinate requirement panels we would need to enable
 326                  * GTC first.
 327                  */
 328                 dev_priv->psr.sink_psr2_support = y_req && alpm;
 329                 DRM_DEBUG_KMS("PSR2 %ssupported\n",
 330                               dev_priv->psr.sink_psr2_support ? "" : "not ");
 331
 332                 if (dev_priv->psr.sink_psr2_support) {
 333                         dev_priv->psr.colorimetry_support =
 334                                 intel_dp_get_colorimetry_status(intel_dp);
 335                         dev_priv->psr.su_x_granularity =
 336                                 intel_dp_get_su_x_granulartiy(intel_dp);
 337                 }
 338         }
 339 }
 340
 341 static void intel_psr_setup_vsc(struct intel_dp *intel_dp,
 342                                 const struct intel_crtc_state *crtc_state)
 343 {
 344         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 345         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 346         struct dp_sdp psr_vsc;
 347
 348         if (dev_priv->psr.psr2_enabled) {
 349                 /* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
 350                 memset(&psr_vsc, 0, sizeof(psr_vsc));
 351                 psr_vsc.sdp_header.HB0 = 0;
 352                 psr_vsc.sdp_header.HB1 = 0x7;
 353                 if (dev_priv->psr.colorimetry_support) {
 354                         psr_vsc.sdp_header.HB2 = 0x5;
 355                         psr_vsc.sdp_header.HB3 = 0x13;
 356                 } else {
 357                         psr_vsc.sdp_header.HB2 = 0x4;
 358                         psr_vsc.sdp_header.HB3 = 0xe;
 359                 }
 360         } else {
 361                 /* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
 362                 memset(&psr_vsc, 0, sizeof(psr_vsc));
 363                 psr_vsc.sdp_header.HB0 = 0;
 364                 psr_vsc.sdp_header.HB1 = 0x7;
 365                 psr_vsc.sdp_header.HB2 = 0x2;
 366                 psr_vsc.sdp_header.HB3 = 0x8;
 367         }
 368
 369         intel_dig_port->write_infoframe(&intel_dig_port->base,
 370                                         crtc_state,
 371                                         DP_SDP_VSC, &psr_vsc, sizeof(psr_vsc));
 372 }
 373
 374 static void hsw_psr_setup_aux(struct intel_dp *intel_dp)
 375 {
 376         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 377         u32 aux_clock_divider, aux_ctl;
 378         int i;
 379         static const u8 aux_msg[] = {
 380                 [0] = DP_AUX_NATIVE_WRITE << 4,
 381                 [1] = DP_SET_POWER >> 8,
 382                 [2] = DP_SET_POWER & 0xff,
 383                 [3] = 1 - 1,
 384                 [4] = DP_SET_POWER_D0,
 385         };
 386         u32 psr_aux_mask = EDP_PSR_AUX_CTL_TIME_OUT_MASK |
 387                            EDP_PSR_AUX_CTL_MESSAGE_SIZE_MASK |
 388                            EDP_PSR_AUX_CTL_PRECHARGE_2US_MASK |
 389                            EDP_PSR_AUX_CTL_BIT_CLOCK_2X_MASK;
 390
 391         BUILD_BUG_ON(sizeof(aux_msg) > 20);
 392         for (i = 0; i < sizeof(aux_msg); i += 4)
 393                 I915_WRITE(EDP_PSR_AUX_DATA(i >> 2),
 394                            intel_dp_pack_aux(&aux_msg[i], sizeof(aux_msg) - i));
 395
 396         aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
 397
 398         /* Start with bits set for DDI_AUX_CTL register */
 399         aux_ctl = intel_dp->get_aux_send_ctl(intel_dp, sizeof(aux_msg),
 400                                              aux_clock_divider);
 401
 402         /* Select only valid bits for SRD_AUX_CTL */
 403         aux_ctl &= psr_aux_mask;
 404         I915_WRITE(EDP_PSR_AUX_CTL, aux_ctl);
 405 }
 406
 407 static void intel_psr_enable_sink(struct intel_dp *intel_dp)
 408 {
 409         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 410         u8 dpcd_val = DP_PSR_ENABLE;
 411
 412         /* Enable ALPM at sink for psr2 */
 413         if (dev_priv->psr.psr2_enabled) {
 414                 drm_dp_dpcd_writeb(&intel_dp->aux, DP_RECEIVER_ALPM_CONFIG,
 415                                    DP_ALPM_ENABLE);
 416                 dpcd_val |= DP_PSR_ENABLE_PSR2 | DP_PSR_IRQ_HPD_WITH_CRC_ERRORS;
 417         } else {
 418                 if (dev_priv->psr.link_standby)
 419                         dpcd_val |= DP_PSR_MAIN_LINK_ACTIVE;
 420
 421                 if (INTEL_GEN(dev_priv) >= 8)
 422                         dpcd_val |= DP_PSR_CRC_VERIFICATION;
 423         }
 424
 425         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, dpcd_val);
 426
 427         drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
 428 }
 429
 430 static u32 intel_psr1_get_tp_time(struct intel_dp *intel_dp)
 431 {
 432         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 433         u32 val = 0;
 434
 435         if (INTEL_GEN(dev_priv) >= 11)
 436                 val |= EDP_PSR_TP4_TIME_0US;
 437
 438         if (dev_priv->vbt.psr.tp1_wakeup_time_us == 0)
 439                 val |= EDP_PSR_TP1_TIME_0us;
 440         else if (dev_priv->vbt.psr.tp1_wakeup_time_us <= 100)
 441                 val |= EDP_PSR_TP1_TIME_100us;
 442         else if (dev_priv->vbt.psr.tp1_wakeup_time_us <= 500)
 443                 val |= EDP_PSR_TP1_TIME_500us;
 444         else
 445                 val |= EDP_PSR_TP1_TIME_2500us;
 446
 447         if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us == 0)
 448                 val |= EDP_PSR_TP2_TP3_TIME_0us;
 449         else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us <= 100)
 450                 val |= EDP_PSR_TP2_TP3_TIME_100us;
 451         else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us <= 500)
 452                 val |= EDP_PSR_TP2_TP3_TIME_500us;
 453         else
 454                 val |= EDP_PSR_TP2_TP3_TIME_2500us;
 455
 456         if (intel_dp_source_supports_hbr2(intel_dp) &&
 457             drm_dp_tps3_supported(intel_dp->dpcd))
 458                 val |= EDP_PSR_TP1_TP3_SEL;
 459         else
 460                 val |= EDP_PSR_TP1_TP2_SEL;
 461
 462         return val;
 463 }
 464
 465 static void hsw_activate_psr1(struct intel_dp *intel_dp)
 466 {
 467         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 468         u32 max_sleep_time = 0x1f;
 469         u32 val = EDP_PSR_ENABLE;
 470
 471         /* Let's use 6 as the minimum to cover all known cases including the
 472          * off-by-one issue that HW has in some cases.
 473          */
 474         int idle_frames = max(6, dev_priv->vbt.psr.idle_frames);
 475
 476         /* sink_sync_latency of 8 means source has to wait for more than 8
 477          * frames, we'll go with 9 frames for now
 478          */
 479         idle_frames = max(idle_frames, dev_priv->psr.sink_sync_latency + 1);
 480         val |= idle_frames << EDP_PSR_IDLE_FRAME_SHIFT;
 481
 482         val |= max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT;
 483         if (IS_HASWELL(dev_priv))
 484                 val |= EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
 485
 486         if (dev_priv->psr.link_standby)
 487                 val |= EDP_PSR_LINK_STANDBY;
 488
 489         val |= intel_psr1_get_tp_time(intel_dp);
 490
 491         if (INTEL_GEN(dev_priv) >= 8)
 492                 val |= EDP_PSR_CRC_ENABLE;
 493
 494         val |= I915_READ(EDP_PSR_CTL) & EDP_PSR_RESTORE_PSR_ACTIVE_CTX_MASK;
 495         I915_WRITE(EDP_PSR_CTL, val);
 496 }
 497
 498 static void hsw_activate_psr2(struct intel_dp *intel_dp)
 499 {
 500         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 501         u32 val;
 502
 503         /* Let's use 6 as the minimum to cover all known cases including the
 504          * off-by-one issue that HW has in some cases.
 505          */
 506         int idle_frames = max(6, dev_priv->vbt.psr.idle_frames);
 507
 508         idle_frames = max(idle_frames, dev_priv->psr.sink_sync_latency + 1);
 509         val = idle_frames << EDP_PSR2_IDLE_FRAME_SHIFT;
 510
 511         val |= EDP_PSR2_ENABLE | EDP_SU_TRACK_ENABLE;
 512         if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
 513                 val |= EDP_Y_COORDINATE_ENABLE;
 514
 515         val |= EDP_PSR2_FRAME_BEFORE_SU(dev_priv->psr.sink_sync_latency + 1);
 516
 517         if (dev_priv->vbt.psr.psr2_tp2_tp3_wakeup_time_us >= 0 &&
 518             dev_priv->vbt.psr.psr2_tp2_tp3_wakeup_time_us <= 50)
 519                 val |= EDP_PSR2_TP2_TIME_50us;
 520         else if (dev_priv->vbt.psr.psr2_tp2_tp3_wakeup_time_us <= 100)
 521                 val |= EDP_PSR2_TP2_TIME_100us;
 522         else if (dev_priv->vbt.psr.psr2_tp2_tp3_wakeup_time_us <= 500)
 523                 val |= EDP_PSR2_TP2_TIME_500us;
 524         else
 525                 val |= EDP_PSR2_TP2_TIME_2500us;
 526
 527         /*
 528          * PSR2 HW is incorrectly using EDP_PSR_TP1_TP3_SEL and BSpec is
 529          * recommending keep this bit unset while PSR2 is enabled.
 530          */
 531         I915_WRITE(EDP_PSR_CTL, 0);
 532
 533         I915_WRITE(EDP_PSR2_CTL, val);
 534 }
 535
 536 static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 537                                     struct intel_crtc_state *crtc_state)
 538 {
 539         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 540         int crtc_hdisplay = crtc_state->base.adjusted_mode.crtc_hdisplay;
 541         int crtc_vdisplay = crtc_state->base.adjusted_mode.crtc_vdisplay;
 542         int psr_max_h = 0, psr_max_v = 0;
 543
 544         if (!dev_priv->psr.sink_psr2_support)
 545                 return false;
 546
 547         /*
 548          * DSC and PSR2 cannot be enabled simultaneously. If a requested
 549          * resolution requires DSC to be enabled, priority is given to DSC
 550          * over PSR2.
 551          */
 552         if (crtc_state->dsc_params.compression_enable) {
 553                 DRM_DEBUG_KMS("PSR2 cannot be enabled since DSC is enabled\n");
 554                 return false;
 555         }
 556
 557         if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
 558                 psr_max_h = 4096;
 559                 psr_max_v = 2304;
 560         } else if (IS_GEN(dev_priv, 9)) {
 561                 psr_max_h = 3640;
 562                 psr_max_v = 2304;
 563         }
 564
 565         if (crtc_hdisplay > psr_max_h || crtc_vdisplay > psr_max_v) {
 566                 DRM_DEBUG_KMS("PSR2 not enabled, resolution %dx%d > max supported %dx%d\n",
 567                               crtc_hdisplay, crtc_vdisplay,
 568                               psr_max_h, psr_max_v);
 569                 return false;
 570         }
 571
 572         /*
 573          * HW sends SU blocks of size four scan lines, which means the starting
 574          * X coordinate and Y granularity requirements will always be met. We
 575          * only need to validate the SU block width is a multiple of
 576          * x granularity.
 577          */
 578         if (crtc_hdisplay % dev_priv->psr.su_x_granularity) {
 579                 DRM_DEBUG_KMS("PSR2 not enabled, hdisplay(%d) not multiple of %d\n",
 580                               crtc_hdisplay, dev_priv->psr.su_x_granularity);
 581                 return false;
 582         }
 583
 584         if (crtc_state->crc_enabled) {
 585                 DRM_DEBUG_KMS("PSR2 not enabled because it would inhibit pipe CRC calculation\n");
 586                 return false;
 587         }
 588
 589         return true;
 590 }
 591
 592 void intel_psr_compute_config(struct intel_dp *intel_dp,
 593                               struct intel_crtc_state *crtc_state)
 594 {
 595         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 596         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 597         const struct drm_display_mode *adjusted_mode =
 598                 &crtc_state->base.adjusted_mode;
 599         int psr_setup_time;
 600
 601         if (!CAN_PSR(dev_priv))
 602                 return;
 603
 604         if (intel_dp != dev_priv->psr.dp)
 605                 return;
 606
 607         /*
 608          * HSW spec explicitly says PSR is tied to port A.
 609          * BDW+ platforms with DDI implementation of PSR have different
 610          * PSR registers per transcoder and we only implement transcoder EDP
 611          * ones. Since by Display design transcoder EDP is tied to port A
 612          * we can safely escape based on the port A.
 613          */
 614         if (dig_port->base.port != PORT_A) {
 615                 DRM_DEBUG_KMS("PSR condition failed: Port not supported\n");
 616                 return;
 617         }
 618
 619         if (dev_priv->psr.sink_not_reliable) {
 620                 DRM_DEBUG_KMS("PSR sink implementation is not reliable\n");
 621                 return;
 622         }
 623
 624         if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
 625                 DRM_DEBUG_KMS("PSR condition failed: Interlaced mode enabled\n");
 626                 return;
 627         }
 628
 629         psr_setup_time = drm_dp_psr_setup_time(intel_dp->psr_dpcd);
 630         if (psr_setup_time < 0) {
 631                 DRM_DEBUG_KMS("PSR condition failed: Invalid PSR setup time (0x%02x)\n",
 632                               intel_dp->psr_dpcd[1]);
 633                 return;
 634         }
 635
 636         if (intel_usecs_to_scanlines(adjusted_mode, psr_setup_time) >
 637             adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vdisplay - 1) {
 638                 DRM_DEBUG_KMS("PSR condition failed: PSR setup time (%d us) too long\n",
 639                               psr_setup_time);
 640                 return;
 641         }
 642
 643         crtc_state->has_psr = true;
 644         crtc_state->has_psr2 = intel_psr2_config_valid(intel_dp, crtc_state);
 645 }
 646
 647 static void intel_psr_activate(struct intel_dp *intel_dp)
 648 {
 649         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 650
 651         if (INTEL_GEN(dev_priv) >= 9)
 652                 WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
 653         WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
 654         WARN_ON(dev_priv->psr.active);
 655         lockdep_assert_held(&dev_priv->psr.lock);
 656
 657         /* psr1 and psr2 are mutually exclusive.*/
 658         if (dev_priv->psr.psr2_enabled)
 659                 hsw_activate_psr2(intel_dp);
 660         else
 661                 hsw_activate_psr1(intel_dp);
 662
 663         dev_priv->psr.active = true;
 664 }
 665
 666 static i915_reg_t gen9_chicken_trans_reg(struct drm_i915_private *dev_priv,
 667                                          enum transcoder cpu_transcoder)
 668 {
 669         static const i915_reg_t regs[] = {
 670                 [TRANSCODER_A] = CHICKEN_TRANS_A,
 671                 [TRANSCODER_B] = CHICKEN_TRANS_B,
 672                 [TRANSCODER_C] = CHICKEN_TRANS_C,
 673                 [TRANSCODER_EDP] = CHICKEN_TRANS_EDP,
 674         };
 675
 676         WARN_ON(INTEL_GEN(dev_priv) < 9);
 677
 678         if (WARN_ON(cpu_transcoder >= ARRAY_SIZE(regs) ||
 679                     !regs[cpu_transcoder].reg))
 680                 cpu_transcoder = TRANSCODER_A;
 681
 682         return regs[cpu_transcoder];
 683 }
 684
 685 static void intel_psr_enable_source(struct intel_dp *intel_dp,
 686                                     const struct intel_crtc_state *crtc_state)
 687 {
 688         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 689         enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 690         u32 mask;
 691
 692         /* Only HSW and BDW have PSR AUX registers that need to be setup. SKL+
 693          * use hardcoded values PSR AUX transactions
 694          */
 695         if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 696                 hsw_psr_setup_aux(intel_dp);
 697
 698         if (dev_priv->psr.psr2_enabled && (IS_GEN(dev_priv, 9) &&
 699                                            !IS_GEMINILAKE(dev_priv))) {
 700                 i915_reg_t reg = gen9_chicken_trans_reg(dev_priv,
 701                                                         cpu_transcoder);
 702                 u32 chicken = I915_READ(reg);
 703
 704                 chicken |= PSR2_VSC_ENABLE_PROG_HEADER |
 705                            PSR2_ADD_VERTICAL_LINE_COUNT;
 706                 I915_WRITE(reg, chicken);
 707         }
 708
 709         /*
 710          * Per Spec: Avoid continuous PSR exit by masking MEMUP and HPD also
 711          * mask LPSP to avoid dependency on other drivers that might block
 712          * runtime_pm besides preventing  other hw tracking issues now we
 713          * can rely on frontbuffer tracking.
 714          */
 715         mask = EDP_PSR_DEBUG_MASK_MEMUP |
 716                EDP_PSR_DEBUG_MASK_HPD |
 717                EDP_PSR_DEBUG_MASK_LPSP |
 718                EDP_PSR_DEBUG_MASK_MAX_SLEEP;
 719
 720         if (INTEL_GEN(dev_priv) < 11)
 721                 mask |= EDP_PSR_DEBUG_MASK_DISP_REG_WRITE;
 722
 723         I915_WRITE(EDP_PSR_DEBUG, mask);
 724 }
 725
 726 static void intel_psr_enable_locked(struct drm_i915_private *dev_priv,
 727                                     const struct intel_crtc_state *crtc_state)
 728 {
 729         struct intel_dp *intel_dp = dev_priv->psr.dp;
 730
 731         WARN_ON(dev_priv->psr.enabled);
 732
 733         dev_priv->psr.psr2_enabled = intel_psr2_enabled(dev_priv, crtc_state);
 734         dev_priv->psr.busy_frontbuffer_bits = 0;
 735         dev_priv->psr.pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
 736
 737         DRM_DEBUG_KMS("Enabling PSR%s\n",
 738                       dev_priv->psr.psr2_enabled ? "2" : "1");
 739         intel_psr_setup_vsc(intel_dp, crtc_state);
 740         intel_psr_enable_sink(intel_dp);
 741         intel_psr_enable_source(intel_dp, crtc_state);
 742         dev_priv->psr.enabled = true;
 743
 744         intel_psr_activate(intel_dp);
 745 }
 746
 747 /**
 748  * intel_psr_enable - Enable PSR
 749  * @intel_dp: Intel DP
 750  * @crtc_state: new CRTC state
 751  *
 752  * This function can only be called after the pipe is fully trained and enabled.
 753  */
 754 void intel_psr_enable(struct intel_dp *intel_dp,
 755                       const struct intel_crtc_state *crtc_state)
 756 {
 757         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 758
 759         if (!crtc_state->has_psr)
 760                 return;
 761
 762         if (WARN_ON(!CAN_PSR(dev_priv)))
 763                 return;
 764
 765         WARN_ON(dev_priv->drrs.dp);
 766
 767         mutex_lock(&dev_priv->psr.lock);
 768
 769         if (!psr_global_enabled(dev_priv->psr.debug)) {
 770                 DRM_DEBUG_KMS("PSR disabled by flag\n");
 771                 goto unlock;
 772         }
 773
 774         intel_psr_enable_locked(dev_priv, crtc_state);
 775
 776 unlock:
 777         mutex_unlock(&dev_priv->psr.lock);
 778 }
 779
 780 static void intel_psr_exit(struct drm_i915_private *dev_priv)
 781 {
 782         u32 val;
 783
 784         if (!dev_priv->psr.active) {
 785                 if (INTEL_GEN(dev_priv) >= 9)
 786                         WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
 787                 WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
 788                 return;
 789         }
 790
 791         if (dev_priv->psr.psr2_enabled) {
 792                 val = I915_READ(EDP_PSR2_CTL);
 793                 WARN_ON(!(val & EDP_PSR2_ENABLE));
 794                 I915_WRITE(EDP_PSR2_CTL, val & ~EDP_PSR2_ENABLE);
 795         } else {
 796                 val = I915_READ(EDP_PSR_CTL);
 797                 WARN_ON(!(val & EDP_PSR_ENABLE));
 798                 I915_WRITE(EDP_PSR_CTL, val & ~EDP_PSR_ENABLE);
 799         }
 800         dev_priv->psr.active = false;
 801 }
 802
 803 static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 804 {
 805         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 806         i915_reg_t psr_status;
 807         u32 psr_status_mask;
 808
 809         lockdep_assert_held(&dev_priv->psr.lock);
 810
 811         if (!dev_priv->psr.enabled)
 812                 return;
 813
 814         DRM_DEBUG_KMS("Disabling PSR%s\n",
 815                       dev_priv->psr.psr2_enabled ? "2" : "1");
 816
 817         intel_psr_exit(dev_priv);
 818
 819         if (dev_priv->psr.psr2_enabled) {
 820                 psr_status = EDP_PSR2_STATUS;
 821                 psr_status_mask = EDP_PSR2_STATUS_STATE_MASK;
 822         } else {
 823                 psr_status = EDP_PSR_STATUS;
 824                 psr_status_mask = EDP_PSR_STATUS_STATE_MASK;
 825         }
 826
 827         /* Wait till PSR is idle */
 828         if (intel_wait_for_register(&dev_priv->uncore,
 829                                     psr_status, psr_status_mask, 0, 2000))
 830                 DRM_ERROR("Timed out waiting PSR idle state\n");
 831
 832         /* Disable PSR on Sink */
 833         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
 834
 835         dev_priv->psr.enabled = false;
 836 }
 837
 838 /**
 839  * intel_psr_disable - Disable PSR
 840  * @intel_dp: Intel DP
 841  * @old_crtc_state: old CRTC state
 842  *
 843  * This function needs to be called before disabling pipe.
 844  */
 845 void intel_psr_disable(struct intel_dp *intel_dp,
 846                        const struct intel_crtc_state *old_crtc_state)
 847 {
 848         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 849
 850         if (!old_crtc_state->has_psr)
 851                 return;
 852
 853         if (WARN_ON(!CAN_PSR(dev_priv)))
 854                 return;
 855
 856         mutex_lock(&dev_priv->psr.lock);
 857
 858         intel_psr_disable_locked(intel_dp);
 859
 860         mutex_unlock(&dev_priv->psr.lock);
 861         cancel_work_sync(&dev_priv->psr.work);
 862 }
 863
 864 static void psr_force_hw_tracking_exit(struct drm_i915_private *dev_priv)
 865 {
 866         /*
 867          * Display WA #0884: all
 868          * This documented WA for bxt can be safely applied
 869          * broadly so we can force HW tracking to exit PSR
 870          * instead of disabling and re-enabling.
 871          * Workaround tells us to write 0 to CUR_SURFLIVE_A,
 872          * but it makes more sense write to the current active
 873          * pipe.
 874          */
 875         I915_WRITE(CURSURFLIVE(dev_priv->psr.pipe), 0);
 876 }
 877
 878 /**
 879  * intel_psr_update - Update PSR state
 880  * @intel_dp: Intel DP
 881  * @crtc_state: new CRTC state
 882  *
 883  * This functions will update PSR states, disabling, enabling or switching PSR
 884  * version when executing fastsets. For full modeset, intel_psr_disable() and
 885  * intel_psr_enable() should be called instead.
 886  */
 887 void intel_psr_update(struct intel_dp *intel_dp,
 888                       const struct intel_crtc_state *crtc_state)
 889 {
 890         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 891         struct i915_psr *psr = &dev_priv->psr;
 892         bool enable, psr2_enable;
 893
 894         if (!CAN_PSR(dev_priv) || READ_ONCE(psr->dp) != intel_dp)
 895                 return;
 896
 897         mutex_lock(&dev_priv->psr.lock);
 898
 899         enable = crtc_state->has_psr && psr_global_enabled(psr->debug);
 900         psr2_enable = intel_psr2_enabled(dev_priv, crtc_state);
 901
 902         if (enable == psr->enabled && psr2_enable == psr->psr2_enabled) {
 903                 /* Force a PSR exit when enabling CRC to avoid CRC timeouts */
 904                 if (crtc_state->crc_enabled && psr->enabled)
 905                         psr_force_hw_tracking_exit(dev_priv);
 906
 907                 goto unlock;
 908         }
 909
 910         if (psr->enabled)
 911                 intel_psr_disable_locked(intel_dp);
 912
 913         if (enable)
 914                 intel_psr_enable_locked(dev_priv, crtc_state);
 915
 916 unlock:
 917         mutex_unlock(&dev_priv->psr.lock);
 918 }
 919
 920 /**
 921  * intel_psr_wait_for_idle - wait for PSR1 to idle
 922  * @new_crtc_state: new CRTC state
 923  * @out_value: PSR status in case of failure
 924  *
 925  * This function is expected to be called from pipe_update_start() where it is
 926  * not expected to race with PSR enable or disable.
 927  *
 928  * Returns: 0 on success or -ETIMEOUT if PSR status does not idle.
 929  */
 930 int intel_psr_wait_for_idle(const struct intel_crtc_state *new_crtc_state,
 931                             u32 *out_value)
 932 {
 933         struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->base.crtc);
 934         struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 935
 936         if (!dev_priv->psr.enabled || !new_crtc_state->has_psr)
 937                 return 0;
 938
 939         /* FIXME: Update this for PSR2 if we need to wait for idle */
 940         if (READ_ONCE(dev_priv->psr.psr2_enabled))
 941                 return 0;
 942
 943         /*
 944          * From bspec: Panel Self Refresh (BDW+)
 945          * Max. time for PSR to idle = Inverse of the refresh rate + 6 ms of
 946          * exit training time + 1.5 ms of aux channel handshake. 50 ms is
 947          * defensive enough to cover everything.
 948          */
 949
 950         return __intel_wait_for_register(&dev_priv->uncore, EDP_PSR_STATUS,
 951                                          EDP_PSR_STATUS_STATE_MASK,
 952                                          EDP_PSR_STATUS_STATE_IDLE, 2, 50,
 953                                          out_value);
 954 }
 955
 956 static bool __psr_wait_for_idle_locked(struct drm_i915_private *dev_priv)
 957 {
 958         i915_reg_t reg;
 959         u32 mask;
 960         int err;
 961
 962         if (!dev_priv->psr.enabled)
 963                 return false;
 964
 965         if (dev_priv->psr.psr2_enabled) {
 966                 reg = EDP_PSR2_STATUS;
 967                 mask = EDP_PSR2_STATUS_STATE_MASK;
 968         } else {
 969                 reg = EDP_PSR_STATUS;
 970                 mask = EDP_PSR_STATUS_STATE_MASK;
 971         }
 972
 973         mutex_unlock(&dev_priv->psr.lock);
 974
 975         err = intel_wait_for_register(&dev_priv->uncore, reg, mask, 0, 50);
 976         if (err)
 977                 DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
 978
 979         /* After the unlocked wait, verify that PSR is still wanted! */
 980         mutex_lock(&dev_priv->psr.lock);
 981         return err == 0 && dev_priv->psr.enabled;
 982 }
 983
 984 static int intel_psr_fastset_force(struct drm_i915_private *dev_priv)
 985 {
 986         struct drm_device *dev = &dev_priv->drm;
 987         struct drm_modeset_acquire_ctx ctx;
 988         struct drm_atomic_state *state;
 989         struct drm_crtc *crtc;
 990         int err;
 991
 992         state = drm_atomic_state_alloc(dev);
 993         if (!state)
 994                 return -ENOMEM;
 995
 996         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 997         state->acquire_ctx = &ctx;
 998
 999 retry:
1000         drm_for_each_crtc(crtc, dev) {
1001                 struct drm_crtc_state *crtc_state;
1002                 struct intel_crtc_state *intel_crtc_state;
1003
1004                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1005                 if (IS_ERR(crtc_state)) {
1006                         err = PTR_ERR(crtc_state);
1007                         goto error;
1008                 }
1009
1010                 intel_crtc_state = to_intel_crtc_state(crtc_state);
1011
1012                 if (crtc_state->active && intel_crtc_state->has_psr) {
1013                         /* Mark mode as changed to trigger a pipe->update() */
1014                         crtc_state->mode_changed = true;
1015                         break;
1016                 }
1017         }
1018
1019         err = drm_atomic_commit(state);
1020
1021 error:
1022         if (err == -EDEADLK) {
1023                 drm_atomic_state_clear(state);
1024                 err = drm_modeset_backoff(&ctx);
1025                 if (!err)
1026                         goto retry;
1027         }
1028
1029         drm_modeset_drop_locks(&ctx);
1030         drm_modeset_acquire_fini(&ctx);
1031         drm_atomic_state_put(state);
1032
1033         return err;
1034 }
1035
1036 int intel_psr_debug_set(struct drm_i915_private *dev_priv, u64 val)
1037 {
1038         const u32 mode = val & I915_PSR_DEBUG_MODE_MASK;
1039         u32 old_mode;
1040         int ret;
1041
1042         if (val & ~(I915_PSR_DEBUG_IRQ | I915_PSR_DEBUG_MODE_MASK) ||
1043             mode > I915_PSR_DEBUG_FORCE_PSR1) {
1044                 DRM_DEBUG_KMS("Invalid debug mask %llx\n", val);
1045                 return -EINVAL;
1046         }
1047
1048         ret = mutex_lock_interruptible(&dev_priv->psr.lock);
1049         if (ret)
1050                 return ret;
1051
1052         old_mode = dev_priv->psr.debug & I915_PSR_DEBUG_MODE_MASK;
1053         dev_priv->psr.debug = val;
1054         intel_psr_irq_control(dev_priv, dev_priv->psr.debug);
1055
1056         mutex_unlock(&dev_priv->psr.lock);
1057
1058         if (old_mode != mode)
1059                 ret = intel_psr_fastset_force(dev_priv);
1060
1061         return ret;
1062 }
1063
1064 static void intel_psr_handle_irq(struct drm_i915_private *dev_priv)
1065 {
1066         struct i915_psr *psr = &dev_priv->psr;
1067
1068         intel_psr_disable_locked(psr->dp);
1069         psr->sink_not_reliable = true;
1070         /* let's make sure that sink is awaken */
1071         drm_dp_dpcd_writeb(&psr->dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
1072 }
1073
1074 static void intel_psr_work(struct work_struct *work)
1075 {
1076         struct drm_i915_private *dev_priv =
1077                 container_of(work, typeof(*dev_priv), psr.work);
1078
1079         mutex_lock(&dev_priv->psr.lock);
1080
1081         if (!dev_priv->psr.enabled)
1082                 goto unlock;
1083
1084         if (READ_ONCE(dev_priv->psr.irq_aux_error))
1085                 intel_psr_handle_irq(dev_priv);
1086
1087         /*
1088          * We have to make sure PSR is ready for re-enable
1089          * otherwise it keeps disabled until next full enable/disable cycle.
1090          * PSR might take some time to get fully disabled
1091          * and be ready for re-enable.
1092          */
1093         if (!__psr_wait_for_idle_locked(dev_priv))
1094                 goto unlock;
1095
1096         /*
1097          * The delayed work can race with an invalidate hence we need to
1098          * recheck. Since psr_flush first clears this and then reschedules we
1099          * won't ever miss a flush when bailing out here.
1100          */
1101         if (dev_priv->psr.busy_frontbuffer_bits || dev_priv->psr.active)
1102                 goto unlock;
1103
1104         intel_psr_activate(dev_priv->psr.dp);
1105 unlock:
1106         mutex_unlock(&dev_priv->psr.lock);
1107 }
1108
1109 /**
1110  * intel_psr_invalidate - Invalidade PSR
1111  * @dev_priv: i915 device
1112  * @frontbuffer_bits: frontbuffer plane tracking bits
1113  * @origin: which operation caused the invalidate
1114  *
1115  * Since the hardware frontbuffer tracking has gaps we need to integrate
1116  * with the software frontbuffer tracking. This function gets called every
1117  * time frontbuffer rendering starts and a buffer gets dirtied. PSR must be
1118  * disabled if the frontbuffer mask contains a buffer relevant to PSR.
1119  *
1120  * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits."
1121  */
1122 void intel_psr_invalidate(struct drm_i915_private *dev_priv,
1123                           unsigned frontbuffer_bits, enum fb_op_origin origin)
1124 {
1125         if (!CAN_PSR(dev_priv))
1126                 return;
1127
1128         if (origin == ORIGIN_FLIP)
1129                 return;
1130
1131         mutex_lock(&dev_priv->psr.lock);
1132         if (!dev_priv->psr.enabled) {
1133                 mutex_unlock(&dev_priv->psr.lock);
1134                 return;
1135         }
1136
1137         frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(dev_priv->psr.pipe);
1138         dev_priv->psr.busy_frontbuffer_bits |= frontbuffer_bits;
1139
1140         if (frontbuffer_bits)
1141                 intel_psr_exit(dev_priv);
1142
1143         mutex_unlock(&dev_priv->psr.lock);
1144 }
1145
1146 /**
1147  * intel_psr_flush - Flush PSR
1148  * @dev_priv: i915 device
1149  * @frontbuffer_bits: frontbuffer plane tracking bits
1150  * @origin: which operation caused the flush
1151  *
1152  * Since the hardware frontbuffer tracking has gaps we need to integrate
1153  * with the software frontbuffer tracking. This function gets called every
1154  * time frontbuffer rendering has completed and flushed out to memory. PSR
1155  * can be enabled again if no other frontbuffer relevant to PSR is dirty.
1156  *
1157  * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits.
1158  */
1159 void intel_psr_flush(struct drm_i915_private *dev_priv,
1160                      unsigned frontbuffer_bits, enum fb_op_origin origin)
1161 {
1162         if (!CAN_PSR(dev_priv))
1163                 return;
1164
1165         if (origin == ORIGIN_FLIP)
1166                 return;
1167
1168         mutex_lock(&dev_priv->psr.lock);
1169         if (!dev_priv->psr.enabled) {
1170                 mutex_unlock(&dev_priv->psr.lock);
1171                 return;
1172         }
1173
1174         frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(dev_priv->psr.pipe);
1175         dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
1176
1177         /* By definition flush = invalidate + flush */
1178         if (frontbuffer_bits)
1179                 psr_force_hw_tracking_exit(dev_priv);
1180
1181         if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
1182                 schedule_work(&dev_priv->psr.work);
1183         mutex_unlock(&dev_priv->psr.lock);
1184 }
1185
1186 /**
1187  * intel_psr_init - Init basic PSR work and mutex.
1188  * @dev_priv: i915 device private
1189  *
1190  * This function is  called only once at driver load to initialize basic
1191  * PSR stuff.
1192  */
1193 void intel_psr_init(struct drm_i915_private *dev_priv)
1194 {
1195         u32 val;
1196
1197         if (!HAS_PSR(dev_priv))
1198                 return;
1199
1200         dev_priv->psr_mmio_base = IS_HASWELL(dev_priv) ?
1201                 HSW_EDP_PSR_BASE : BDW_EDP_PSR_BASE;
1202
1203         if (!dev_priv->psr.sink_support)
1204                 return;
1205
1206         if (i915_modparams.enable_psr == -1)
1207                 if (INTEL_GEN(dev_priv) < 9 || !dev_priv->vbt.psr.enable)
1208                         i915_modparams.enable_psr = 0;
1209
1210         /*
1211          * If a PSR error happened and the driver is reloaded, the EDP_PSR_IIR
1212          * will still keep the error set even after the reset done in the
1213          * irq_preinstall and irq_uninstall hooks.
1214          * And enabling in this situation cause the screen to freeze in the
1215          * first time that PSR HW tries to activate so lets keep PSR disabled
1216          * to avoid any rendering problems.
1217          */
1218         val = I915_READ(EDP_PSR_IIR);
1219         val &= EDP_PSR_ERROR(edp_psr_shift(TRANSCODER_EDP));
1220         if (val) {
1221                 DRM_DEBUG_KMS("PSR interruption error set\n");
1222                 dev_priv->psr.sink_not_reliable = true;
1223         }
1224
1225         /* Set link_standby x link_off defaults */
1226         if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
1227                 /* HSW and BDW require workarounds that we don't implement. */
1228                 dev_priv->psr.link_standby = false;
1229         else
1230                 /* For new platforms let's respect VBT back again */
1231                 dev_priv->psr.link_standby = dev_priv->vbt.psr.full_link;
1232
1233         INIT_WORK(&dev_priv->psr.work, intel_psr_work);
1234         mutex_init(&dev_priv->psr.lock);
1235 }
1236
1237 void intel_psr_short_pulse(struct intel_dp *intel_dp)
1238 {
1239         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1240         struct i915_psr *psr = &dev_priv->psr;
1241         u8 val;
1242         const u8 errors = DP_PSR_RFB_STORAGE_ERROR |
1243                           DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR |
1244                           DP_PSR_LINK_CRC_ERROR;
1245
1246         if (!CAN_PSR(dev_priv) || !intel_dp_is_edp(intel_dp))
1247                 return;
1248
1249         mutex_lock(&psr->lock);
1250
1251         if (!psr->enabled || psr->dp != intel_dp)
1252                 goto exit;
1253
1254         if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_STATUS, &val) != 1) {
1255                 DRM_ERROR("PSR_STATUS dpcd read failed\n");
1256                 goto exit;
1257         }
1258
1259         if ((val & DP_PSR_SINK_STATE_MASK) == DP_PSR_SINK_INTERNAL_ERROR) {
1260                 DRM_DEBUG_KMS("PSR sink internal error, disabling PSR\n");
1261                 intel_psr_disable_locked(intel_dp);
1262                 psr->sink_not_reliable = true;
1263         }
1264
1265         if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_ERROR_STATUS, &val) != 1) {
1266                 DRM_ERROR("PSR_ERROR_STATUS dpcd read failed\n");
1267                 goto exit;
1268         }
1269
1270         if (val & DP_PSR_RFB_STORAGE_ERROR)
1271                 DRM_DEBUG_KMS("PSR RFB storage error, disabling PSR\n");
1272         if (val & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
1273                 DRM_DEBUG_KMS("PSR VSC SDP uncorrectable error, disabling PSR\n");
1274         if (val & DP_PSR_LINK_CRC_ERROR)
1275                 DRM_ERROR("PSR Link CRC error, disabling PSR\n");
1276
1277         if (val & ~errors)
1278                 DRM_ERROR("PSR_ERROR_STATUS unhandled errors %x\n",
1279                           val & ~errors);
1280         if (val & errors) {
1281                 intel_psr_disable_locked(intel_dp);
1282                 psr->sink_not_reliable = true;
1283         }
1284         /* clear status register */
1285         drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS, val);
1286 exit:
1287         mutex_unlock(&psr->lock);
1288 }
1289
1290 bool intel_psr_enabled(struct intel_dp *intel_dp)
1291 {
1292         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
1293         bool ret;
1294
1295         if (!CAN_PSR(dev_priv) || !intel_dp_is_edp(intel_dp))
1296                 return false;
1297
1298         mutex_lock(&dev_priv->psr.lock);
1299         ret = (dev_priv->psr.dp == intel_dp && dev_priv->psr.enabled);
1300         mutex_unlock(&dev_priv->psr.lock);
1301
1302         return ret;
1303 }