drivers/soundwire/intel_auxdevice.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 // Copyright(c) 2015-22 Intel Corporation.
   3
   4 /*
   5  * Soundwire Intel Manager Driver
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/delay.h>
  11 #include <linux/module.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/auxiliary_bus.h>
  15 #include <sound/pcm_params.h>
  16 #include <linux/pm_runtime.h>
  17 #include <sound/soc.h>
  18 #include <linux/soundwire/sdw_registers.h>
  19 #include <linux/soundwire/sdw.h>
  20 #include <linux/soundwire/sdw_intel.h>
  21 #include "cadence_master.h"
  22 #include "bus.h"
  23 #include "intel.h"
  24 #include "intel_auxdevice.h"
  25
  26 /* IDA min selected to avoid conflicts with HDaudio/iDISP SDI values */
  27 #define INTEL_DEV_NUM_IDA_MIN           4
  28
  29 #define INTEL_MASTER_SUSPEND_DELAY_MS   3000
  30
  31 /*
  32  * debug/config flags for the Intel SoundWire Master.
  33  *
  34  * Since we may have multiple masters active, we can have up to 8
  35  * flags reused in each byte, with master0 using the ls-byte, etc.
  36  */
  37
  38 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME             BIT(0)
  39 #define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP             BIT(1)
  40 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE        BIT(2)
  41 #define SDW_INTEL_MASTER_DISABLE_MULTI_LINK             BIT(3)
  42
  43 static int md_flags;
  44 module_param_named(sdw_md_flags, md_flags, int, 0444);
  45 MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");
  46
  47 static int generic_pre_bank_switch(struct sdw_bus *bus)
  48 {
  49         struct sdw_cdns *cdns = bus_to_cdns(bus);
  50         struct sdw_intel *sdw = cdns_to_intel(cdns);
  51
  52         return sdw->link_res->hw_ops->pre_bank_switch(sdw);
  53 }
  54
  55 static int generic_post_bank_switch(struct sdw_bus *bus)
  56 {
  57         struct sdw_cdns *cdns = bus_to_cdns(bus);
  58         struct sdw_intel *sdw = cdns_to_intel(cdns);
  59
  60         return sdw->link_res->hw_ops->post_bank_switch(sdw);
  61 }
  62
  63 static int sdw_master_read_intel_prop(struct sdw_bus *bus)
  64 {
  65         struct sdw_master_prop *prop = &bus->prop;
  66         struct fwnode_handle *link;
  67         char name[32];
  68         u32 quirk_mask;
  69
  70         /* Find master handle */
  71         snprintf(name, sizeof(name),
  72                  "mipi-sdw-link-%d-subproperties", bus->link_id);
  73
  74         link = device_get_named_child_node(bus->dev, name);
  75         if (!link) {
  76                 dev_err(bus->dev, "Master node %s not found\n", name);
  77                 return -EIO;
  78         }
  79
  80         fwnode_property_read_u32(link,
  81                                  "intel-sdw-ip-clock",
  82                                  &prop->mclk_freq);
  83
  84         /* the values reported by BIOS are the 2x clock, not the bus clock */
  85         prop->mclk_freq /= 2;
  86
  87         fwnode_property_read_u32(link,
  88                                  "intel-quirk-mask",
  89                                  &quirk_mask);
  90
  91         if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
  92                 prop->hw_disabled = true;
  93
  94         prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
  95                 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
  96
  97         return 0;
  98 }
  99
 100 static int intel_prop_read(struct sdw_bus *bus)
 101 {
 102         /* Initialize with default handler to read all DisCo properties */
 103         sdw_master_read_prop(bus);
 104
 105         /* read Intel-specific properties */
 106         sdw_master_read_intel_prop(bus);
 107
 108         return 0;
 109 }
 110
 111 static struct sdw_master_ops sdw_intel_ops = {
 112         .read_prop = intel_prop_read,
 113         .override_adr = sdw_dmi_override_adr,
 114         .xfer_msg = cdns_xfer_msg,
 115         .xfer_msg_defer = cdns_xfer_msg_defer,
 116         .set_bus_conf = cdns_bus_conf,
 117         .pre_bank_switch = generic_pre_bank_switch,
 118         .post_bank_switch = generic_post_bank_switch,
 119         .read_ping_status = cdns_read_ping_status,
 120 };
 121
 122 /*
 123  * probe and init (aux_dev_id argument is required by function prototype but not used)
 124  */
 125 static int intel_link_probe(struct auxiliary_device *auxdev,
 126                             const struct auxiliary_device_id *aux_dev_id)
 127
 128 {
 129         struct device *dev = &auxdev->dev;
 130         struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
 131         struct sdw_intel *sdw;
 132         struct sdw_cdns *cdns;
 133         struct sdw_bus *bus;
 134         int ret;
 135
 136         sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
 137         if (!sdw)
 138                 return -ENOMEM;
 139
 140         cdns = &sdw->cdns;
 141         bus = &cdns->bus;
 142
 143         sdw->instance = auxdev->id;
 144         sdw->link_res = &ldev->link_res;
 145         cdns->dev = dev;
 146         cdns->registers = sdw->link_res->registers;
 147         cdns->instance = sdw->instance;
 148         cdns->msg_count = 0;
 149
 150         bus->link_id = auxdev->id;
 151         bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN;
 152         bus->clk_stop_timeout = 1;
 153
 154         sdw_cdns_probe(cdns);
 155
 156         /* Set ops */
 157         bus->ops = &sdw_intel_ops;
 158
 159         /* set driver data, accessed by snd_soc_dai_get_drvdata() */
 160         auxiliary_set_drvdata(auxdev, cdns);
 161
 162         /* use generic bandwidth allocation algorithm */
 163         sdw->cdns.bus.compute_params = sdw_compute_params;
 164
 165         /* avoid resuming from pm_runtime suspend if it's not required */
 166         dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
 167
 168         ret = sdw_bus_master_add(bus, dev, dev->fwnode);
 169         if (ret) {
 170                 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
 171                 return ret;
 172         }
 173
 174         if (bus->prop.hw_disabled)
 175                 dev_info(dev,
 176                          "SoundWire master %d is disabled, will be ignored\n",
 177                          bus->link_id);
 178         /*
 179          * Ignore BIOS err_threshold, it's a really bad idea when dealing
 180          * with multiple hardware synchronized links
 181          */
 182         bus->prop.err_threshold = 0;
 183
 184         return 0;
 185 }
 186
 187 int intel_link_startup(struct auxiliary_device *auxdev)
 188 {
 189         struct device *dev = &auxdev->dev;
 190         struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
 191         struct sdw_intel *sdw = cdns_to_intel(cdns);
 192         struct sdw_bus *bus = &cdns->bus;
 193         int link_flags;
 194         bool multi_link;
 195         u32 clock_stop_quirks;
 196         int ret;
 197
 198         if (bus->prop.hw_disabled) {
 199                 dev_info(dev,
 200                          "SoundWire master %d is disabled, ignoring\n",
 201                          sdw->instance);
 202                 return 0;
 203         }
 204
 205         link_flags = md_flags >> (bus->link_id * 8);
 206         multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
 207         if (!multi_link) {
 208                 dev_dbg(dev, "Multi-link is disabled\n");
 209         } else {
 210                 /*
 211                  * hardware-based synchronization is required regardless
 212                  * of the number of segments used by a stream: SSP-based
 213                  * synchronization is gated by gsync when the multi-master
 214                  * mode is set.
 215                  */
 216                 bus->hw_sync_min_links = 1;
 217         }
 218         bus->multi_link = multi_link;
 219
 220         /* Initialize shim, controller */
 221         ret = sdw_intel_link_power_up(sdw);
 222         if (ret)
 223                 goto err_init;
 224
 225         /* Register DAIs */
 226         ret = sdw_intel_register_dai(sdw);
 227         if (ret) {
 228                 dev_err(dev, "DAI registration failed: %d\n", ret);
 229                 goto err_power_up;
 230         }
 231
 232         sdw_intel_debugfs_init(sdw);
 233
 234         /* start bus */
 235         ret = sdw_intel_start_bus(sdw);
 236         if (ret) {
 237                 dev_err(dev, "bus start failed: %d\n", ret);
 238                 goto err_power_up;
 239         }
 240
 241         /* Enable runtime PM */
 242         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
 243                 pm_runtime_set_autosuspend_delay(dev,
 244                                                  INTEL_MASTER_SUSPEND_DELAY_MS);
 245                 pm_runtime_use_autosuspend(dev);
 246                 pm_runtime_mark_last_busy(dev);
 247
 248                 pm_runtime_set_active(dev);
 249                 pm_runtime_enable(dev);
 250         }
 251
 252         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 253         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
 254                 /*
 255                  * To keep the clock running we need to prevent
 256                  * pm_runtime suspend from happening by increasing the
 257                  * reference count.
 258                  * This quirk is specified by the parent PCI device in
 259                  * case of specific latency requirements. It will have
 260                  * no effect if pm_runtime is disabled by the user via
 261                  * a module parameter for testing purposes.
 262                  */
 263                 pm_runtime_get_noresume(dev);
 264         }
 265
 266         /*
 267          * The runtime PM status of Slave devices is "Unsupported"
 268          * until they report as ATTACHED. If they don't, e.g. because
 269          * there are no Slave devices populated or if the power-on is
 270          * delayed or dependent on a power switch, the Master will
 271          * remain active and prevent its parent from suspending.
 272          *
 273          * Conditionally force the pm_runtime core to re-evaluate the
 274          * Master status in the absence of any Slave activity. A quirk
 275          * is provided to e.g. deal with Slaves that may be powered on
 276          * with a delay. A more complete solution would require the
 277          * definition of Master properties.
 278          */
 279         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
 280                 pm_runtime_idle(dev);
 281
 282         sdw->startup_done = true;
 283         return 0;
 284
 285 err_power_up:
 286         sdw_intel_link_power_down(sdw);
 287 err_init:
 288         return ret;
 289 }
 290
 291 static void intel_link_remove(struct auxiliary_device *auxdev)
 292 {
 293         struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
 294         struct sdw_intel *sdw = cdns_to_intel(cdns);
 295         struct sdw_bus *bus = &cdns->bus;
 296
 297         /*
 298          * Since pm_runtime is already disabled, we don't decrease
 299          * the refcount when the clock_stop_quirk is
 300          * SDW_INTEL_CLK_STOP_NOT_ALLOWED
 301          */
 302         if (!bus->prop.hw_disabled) {
 303                 sdw_intel_debugfs_exit(sdw);
 304                 sdw_cdns_enable_interrupt(cdns, false);
 305         }
 306         sdw_bus_master_delete(bus);
 307 }
 308
 309 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
 310 {
 311         struct device *dev = &auxdev->dev;
 312         struct sdw_intel *sdw;
 313         struct sdw_bus *bus;
 314
 315         sdw = auxiliary_get_drvdata(auxdev);
 316         bus = &sdw->cdns.bus;
 317
 318         if (bus->prop.hw_disabled || !sdw->startup_done) {
 319                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 320                         bus->link_id);
 321                 return 0;
 322         }
 323
 324         if (!sdw_intel_shim_check_wake(sdw))
 325                 return 0;
 326
 327         /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
 328         sdw_intel_shim_wake(sdw, false);
 329
 330         /*
 331          * resume the Master, which will generate a bus reset and result in
 332          * Slaves re-attaching and be re-enumerated. The SoundWire physical
 333          * device which generated the wake will trigger an interrupt, which
 334          * will in turn cause the corresponding Linux Slave device to be
 335          * resumed and the Slave codec driver to check the status.
 336          */
 337         pm_request_resume(dev);
 338
 339         return 0;
 340 }
 341
 342 /*
 343  * PM calls
 344  */
 345
 346 static int intel_resume_child_device(struct device *dev, void *data)
 347 {
 348         int ret;
 349         struct sdw_slave *slave = dev_to_sdw_dev(dev);
 350
 351         if (!slave->probed) {
 352                 dev_dbg(dev, "skipping device, no probed driver\n");
 353                 return 0;
 354         }
 355         if (!slave->dev_num_sticky) {
 356                 dev_dbg(dev, "skipping device, never detected on bus\n");
 357                 return 0;
 358         }
 359
 360         ret = pm_request_resume(dev);
 361         if (ret < 0)
 362                 dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
 363
 364         return ret;
 365 }
 366
 367 static int __maybe_unused intel_pm_prepare(struct device *dev)
 368 {
 369         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 370         struct sdw_intel *sdw = cdns_to_intel(cdns);
 371         struct sdw_bus *bus = &cdns->bus;
 372         u32 clock_stop_quirks;
 373         int ret;
 374
 375         if (bus->prop.hw_disabled || !sdw->startup_done) {
 376                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 377                         bus->link_id);
 378                 return 0;
 379         }
 380
 381         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 382
 383         if (pm_runtime_suspended(dev) &&
 384             pm_runtime_suspended(dev->parent) &&
 385             ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
 386              !clock_stop_quirks)) {
 387                 /*
 388                  * if we've enabled clock stop, and the parent is suspended, the SHIM registers
 389                  * are not accessible and the shim wake cannot be disabled.
 390                  * The only solution is to resume the entire bus to full power
 391                  */
 392
 393                 /*
 394                  * If any operation in this block fails, we keep going since we don't want
 395                  * to prevent system suspend from happening and errors should be recoverable
 396                  * on resume.
 397                  */
 398
 399                 /*
 400                  * first resume the device for this link. This will also by construction
 401                  * resume the PCI parent device.
 402                  */
 403                 ret = pm_request_resume(dev);
 404                 if (ret < 0) {
 405                         dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
 406                         return 0;
 407                 }
 408
 409                 /*
 410                  * Continue resuming the entire bus (parent + child devices) to exit
 411                  * the clock stop mode. If there are no devices connected on this link
 412                  * this is a no-op.
 413                  * The resume to full power could have been implemented with a .prepare
 414                  * step in SoundWire codec drivers. This would however require a lot
 415                  * of code to handle an Intel-specific corner case. It is simpler in
 416                  * practice to add a loop at the link level.
 417                  */
 418                 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
 419
 420                 if (ret < 0)
 421                         dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int __maybe_unused intel_suspend(struct device *dev)
 428 {
 429         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 430         struct sdw_intel *sdw = cdns_to_intel(cdns);
 431         struct sdw_bus *bus = &cdns->bus;
 432         u32 clock_stop_quirks;
 433         int ret;
 434
 435         if (bus->prop.hw_disabled || !sdw->startup_done) {
 436                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 437                         bus->link_id);
 438                 return 0;
 439         }
 440
 441         if (pm_runtime_suspended(dev)) {
 442                 dev_dbg(dev, "pm_runtime status: suspended\n");
 443
 444                 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 445
 446                 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
 447                     !clock_stop_quirks) {
 448
 449                         if (pm_runtime_suspended(dev->parent)) {
 450                                 /*
 451                                  * paranoia check: this should not happen with the .prepare
 452                                  * resume to full power
 453                                  */
 454                                 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
 455                         } else {
 456                                 sdw_intel_shim_wake(sdw, false);
 457                         }
 458                 }
 459
 460                 return 0;
 461         }
 462
 463         ret = sdw_intel_stop_bus(sdw, false);
 464         if (ret < 0) {
 465                 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
 466                 return ret;
 467         }
 468
 469         return 0;
 470 }
 471
 472 static int __maybe_unused intel_suspend_runtime(struct device *dev)
 473 {
 474         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 475         struct sdw_intel *sdw = cdns_to_intel(cdns);
 476         struct sdw_bus *bus = &cdns->bus;
 477         u32 clock_stop_quirks;
 478         int ret;
 479
 480         if (bus->prop.hw_disabled || !sdw->startup_done) {
 481                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 482                         bus->link_id);
 483                 return 0;
 484         }
 485
 486         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 487
 488         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
 489                 ret = sdw_intel_stop_bus(sdw, false);
 490                 if (ret < 0) {
 491                         dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
 492                                 __func__, ret);
 493                         return ret;
 494                 }
 495         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
 496                 ret = sdw_intel_stop_bus(sdw, true);
 497                 if (ret < 0) {
 498                         dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
 499                                 __func__, ret);
 500                         return ret;
 501                 }
 502         } else {
 503                 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
 504                         __func__, clock_stop_quirks);
 505                 ret = -EINVAL;
 506         }
 507
 508         return ret;
 509 }
 510
 511 static int __maybe_unused intel_resume(struct device *dev)
 512 {
 513         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 514         struct sdw_intel *sdw = cdns_to_intel(cdns);
 515         struct sdw_bus *bus = &cdns->bus;
 516         int link_flags;
 517         int ret;
 518
 519         if (bus->prop.hw_disabled || !sdw->startup_done) {
 520                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 521                         bus->link_id);
 522                 return 0;
 523         }
 524
 525         link_flags = md_flags >> (bus->link_id * 8);
 526
 527         if (pm_runtime_suspended(dev)) {
 528                 dev_dbg(dev, "pm_runtime status was suspended, forcing active\n");
 529
 530                 /* follow required sequence from runtime_pm.rst */
 531                 pm_runtime_disable(dev);
 532                 pm_runtime_set_active(dev);
 533                 pm_runtime_mark_last_busy(dev);
 534                 pm_runtime_enable(dev);
 535
 536                 link_flags = md_flags >> (bus->link_id * 8);
 537
 538                 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
 539                         pm_runtime_idle(dev);
 540         }
 541
 542         ret = sdw_intel_link_power_up(sdw);
 543         if (ret) {
 544                 dev_err(dev, "%s failed: %d\n", __func__, ret);
 545                 return ret;
 546         }
 547
 548         /*
 549          * make sure all Slaves are tagged as UNATTACHED and provide
 550          * reason for reinitialization
 551          */
 552         sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
 553
 554         ret = sdw_intel_start_bus(sdw);
 555         if (ret < 0) {
 556                 dev_err(dev, "cannot start bus during resume\n");
 557                 sdw_intel_link_power_down(sdw);
 558                 return ret;
 559         }
 560
 561         /*
 562          * after system resume, the pm_runtime suspend() may kick in
 563          * during the enumeration, before any children device force the
 564          * master device to remain active.  Using pm_runtime_get()
 565          * routines is not really possible, since it'd prevent the
 566          * master from suspending.
 567          * A reasonable compromise is to update the pm_runtime
 568          * counters and delay the pm_runtime suspend by several
 569          * seconds, by when all enumeration should be complete.
 570          */
 571         pm_runtime_mark_last_busy(dev);
 572
 573         return 0;
 574 }
 575
 576 static int __maybe_unused intel_resume_runtime(struct device *dev)
 577 {
 578         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 579         struct sdw_intel *sdw = cdns_to_intel(cdns);
 580         struct sdw_bus *bus = &cdns->bus;
 581         u32 clock_stop_quirks;
 582         int ret;
 583
 584         if (bus->prop.hw_disabled || !sdw->startup_done) {
 585                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 586                         bus->link_id);
 587                 return 0;
 588         }
 589
 590         /* unconditionally disable WAKEEN interrupt */
 591         sdw_intel_shim_wake(sdw, false);
 592
 593         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 594
 595         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
 596                 ret = sdw_intel_link_power_up(sdw);
 597                 if (ret) {
 598                         dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
 599                         return ret;
 600                 }
 601
 602                 /*
 603                  * make sure all Slaves are tagged as UNATTACHED and provide
 604                  * reason for reinitialization
 605                  */
 606                 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
 607
 608                 ret = sdw_intel_start_bus(sdw);
 609                 if (ret < 0) {
 610                         dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
 611                         sdw_intel_link_power_down(sdw);
 612                         return ret;
 613                 }
 614
 615         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
 616                 ret = sdw_intel_link_power_up(sdw);
 617                 if (ret) {
 618                         dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
 619                         return ret;
 620                 }
 621
 622                 ret = sdw_intel_start_bus_after_reset(sdw);
 623                 if (ret < 0) {
 624                         dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
 625                         sdw_intel_link_power_down(sdw);
 626                         return ret;
 627                 }
 628         } else if (!clock_stop_quirks) {
 629
 630                 sdw_intel_check_clock_stop(sdw);
 631
 632                 ret = sdw_intel_link_power_up(sdw);
 633                 if (ret) {
 634                         dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
 635                         return ret;
 636                 }
 637
 638                 ret = sdw_intel_start_bus_after_clock_stop(sdw);
 639                 if (ret < 0) {
 640                         dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
 641                         sdw_intel_link_power_down(sdw);
 642                         return ret;
 643                 }
 644         } else {
 645                 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
 646                         __func__, clock_stop_quirks);
 647                 ret = -EINVAL;
 648         }
 649
 650         return ret;
 651 }
 652
 653 static const struct dev_pm_ops intel_pm = {
 654         .prepare = intel_pm_prepare,
 655         SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
 656         SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
 657 };
 658
 659 static const struct auxiliary_device_id intel_link_id_table[] = {
 660         { .name = "soundwire_intel.link" },
 661         {},
 662 };
 663 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
 664
 665 static struct auxiliary_driver sdw_intel_drv = {
 666         .probe = intel_link_probe,
 667         .remove = intel_link_remove,
 668         .driver = {
 669                 /* auxiliary_driver_register() sets .name to be the modname */
 670                 .pm = &intel_pm,
 671         },
 672         .id_table = intel_link_id_table
 673 };
 674 module_auxiliary_driver(sdw_intel_drv);
 675
 676 MODULE_LICENSE("Dual BSD/GPL");
 677 MODULE_DESCRIPTION("Intel Soundwire Link Driver");