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 #define INTEL_MASTER_SUSPEND_DELAY_MS   3000
  27
  28 /*
  29  * debug/config flags for the Intel SoundWire Master.
  30  *
  31  * Since we may have multiple masters active, we can have up to 8
  32  * flags reused in each byte, with master0 using the ls-byte, etc.
  33  */
  34
  35 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME             BIT(0)
  36 #define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP             BIT(1)
  37 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE        BIT(2)
  38 #define SDW_INTEL_MASTER_DISABLE_MULTI_LINK             BIT(3)
  39
  40 static int md_flags;
  41 module_param_named(sdw_md_flags, md_flags, int, 0444);
  42 MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");
  43
  44 struct wake_capable_part {
  45         const u16 mfg_id;
  46         const u16 part_id;
  47 };
  48
  49 static struct wake_capable_part wake_capable_list[] = {
  50         {0x025d, 0x5682},
  51         {0x025d, 0x700},
  52         {0x025d, 0x711},
  53         {0x025d, 0x1712},
  54         {0x025d, 0x1713},
  55         {0x025d, 0x1716},
  56         {0x025d, 0x1717},
  57         {0x025d, 0x712},
  58         {0x025d, 0x713},
  59         {0x025d, 0x714},
  60         {0x025d, 0x715},
  61         {0x025d, 0x716},
  62         {0x025d, 0x717},
  63         {0x025d, 0x722},
  64 };
  65
  66 static bool is_wake_capable(struct sdw_slave *slave)
  67 {
  68         int i;
  69
  70         for (i = 0; i < ARRAY_SIZE(wake_capable_list); i++)
  71                 if (slave->id.part_id == wake_capable_list[i].part_id &&
  72                     slave->id.mfg_id == wake_capable_list[i].mfg_id)
  73                         return true;
  74         return false;
  75 }
  76
  77 static int generic_pre_bank_switch(struct sdw_bus *bus)
  78 {
  79         struct sdw_cdns *cdns = bus_to_cdns(bus);
  80         struct sdw_intel *sdw = cdns_to_intel(cdns);
  81
  82         return sdw->link_res->hw_ops->pre_bank_switch(sdw);
  83 }
  84
  85 static int generic_post_bank_switch(struct sdw_bus *bus)
  86 {
  87         struct sdw_cdns *cdns = bus_to_cdns(bus);
  88         struct sdw_intel *sdw = cdns_to_intel(cdns);
  89
  90         return sdw->link_res->hw_ops->post_bank_switch(sdw);
  91 }
  92
  93 static void generic_new_peripheral_assigned(struct sdw_bus *bus,
  94                                             struct sdw_slave *slave,
  95                                             int dev_num)
  96 {
  97         struct sdw_cdns *cdns = bus_to_cdns(bus);
  98         struct sdw_intel *sdw = cdns_to_intel(cdns);
  99         int dev_num_min;
 100         int dev_num_max;
 101         bool wake_capable = slave->prop.wake_capable || is_wake_capable(slave);
 102
 103         if (wake_capable) {
 104                 dev_num_min = SDW_INTEL_DEV_NUM_IDA_MIN;
 105                 dev_num_max = SDW_MAX_DEVICES;
 106         } else {
 107                 dev_num_min = 1;
 108                 dev_num_max = SDW_INTEL_DEV_NUM_IDA_MIN - 1;
 109         }
 110
 111         /* paranoia check, this should never happen */
 112         if (dev_num < dev_num_min || dev_num > dev_num_max)  {
 113                 dev_err(bus->dev, "%s: invalid dev_num %d, wake supported %d\n",
 114                         __func__, dev_num, slave->prop.wake_capable);
 115                 return;
 116         }
 117
 118         if (sdw->link_res->hw_ops->program_sdi && wake_capable)
 119                 sdw->link_res->hw_ops->program_sdi(sdw, dev_num);
 120 }
 121
 122 static int sdw_master_read_intel_prop(struct sdw_bus *bus)
 123 {
 124         struct sdw_master_prop *prop = &bus->prop;
 125         struct fwnode_handle *link;
 126         char name[32];
 127         u32 quirk_mask;
 128
 129         /* Find master handle */
 130         snprintf(name, sizeof(name),
 131                  "mipi-sdw-link-%d-subproperties", bus->link_id);
 132
 133         link = device_get_named_child_node(bus->dev, name);
 134         if (!link) {
 135                 dev_err(bus->dev, "Master node %s not found\n", name);
 136                 return -EIO;
 137         }
 138
 139         fwnode_property_read_u32(link,
 140                                  "intel-sdw-ip-clock",
 141                                  &prop->mclk_freq);
 142
 143         /* the values reported by BIOS are the 2x clock, not the bus clock */
 144         prop->mclk_freq /= 2;
 145
 146         fwnode_property_read_u32(link,
 147                                  "intel-quirk-mask",
 148                                  &quirk_mask);
 149
 150         if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
 151                 prop->hw_disabled = true;
 152
 153         prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
 154                 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
 155
 156         return 0;
 157 }
 158
 159 static int intel_prop_read(struct sdw_bus *bus)
 160 {
 161         /* Initialize with default handler to read all DisCo properties */
 162         sdw_master_read_prop(bus);
 163
 164         /* read Intel-specific properties */
 165         sdw_master_read_intel_prop(bus);
 166
 167         return 0;
 168 }
 169
 170 static DEFINE_IDA(intel_peripheral_ida);
 171
 172 static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
 173 {
 174         int bit;
 175
 176         if (slave->prop.wake_capable || is_wake_capable(slave))
 177                 return ida_alloc_range(&intel_peripheral_ida,
 178                                        SDW_INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES,
 179                                        GFP_KERNEL);
 180
 181         bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
 182         if (bit == SDW_MAX_DEVICES)
 183                 return -ENODEV;
 184
 185         return bit;
 186 }
 187
 188 static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
 189 {
 190         if (slave->prop.wake_capable || is_wake_capable(slave))
 191                 ida_free(&intel_peripheral_ida, slave->dev_num);
 192 }
 193
 194 static struct sdw_master_ops sdw_intel_ops = {
 195         .read_prop = intel_prop_read,
 196         .override_adr = sdw_dmi_override_adr,
 197         .xfer_msg = cdns_xfer_msg,
 198         .xfer_msg_defer = cdns_xfer_msg_defer,
 199         .set_bus_conf = cdns_bus_conf,
 200         .pre_bank_switch = generic_pre_bank_switch,
 201         .post_bank_switch = generic_post_bank_switch,
 202         .read_ping_status = cdns_read_ping_status,
 203         .get_device_num =  intel_get_device_num_ida,
 204         .put_device_num = intel_put_device_num_ida,
 205         .new_peripheral_assigned = generic_new_peripheral_assigned,
 206 };
 207
 208 /*
 209  * probe and init (aux_dev_id argument is required by function prototype but not used)
 210  */
 211 static int intel_link_probe(struct auxiliary_device *auxdev,
 212                             const struct auxiliary_device_id *aux_dev_id)
 213
 214 {
 215         struct device *dev = &auxdev->dev;
 216         struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
 217         struct sdw_intel *sdw;
 218         struct sdw_cdns *cdns;
 219         struct sdw_bus *bus;
 220         int ret;
 221
 222         sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
 223         if (!sdw)
 224                 return -ENOMEM;
 225
 226         cdns = &sdw->cdns;
 227         bus = &cdns->bus;
 228
 229         sdw->instance = auxdev->id;
 230         sdw->link_res = &ldev->link_res;
 231         cdns->dev = dev;
 232         cdns->registers = sdw->link_res->registers;
 233         cdns->ip_offset = sdw->link_res->ip_offset;
 234         cdns->instance = sdw->instance;
 235         cdns->msg_count = 0;
 236
 237         /* single controller for all SoundWire links */
 238         bus->controller_id = 0;
 239
 240         bus->link_id = auxdev->id;
 241         bus->clk_stop_timeout = 1;
 242
 243         sdw_cdns_probe(cdns);
 244
 245         /* Set ops */
 246         bus->ops = &sdw_intel_ops;
 247
 248         /* set driver data, accessed by snd_soc_dai_get_drvdata() */
 249         auxiliary_set_drvdata(auxdev, cdns);
 250
 251         /* use generic bandwidth allocation algorithm */
 252         sdw->cdns.bus.compute_params = sdw_compute_params;
 253
 254         /* avoid resuming from pm_runtime suspend if it's not required */
 255         dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
 256
 257         ret = sdw_bus_master_add(bus, dev, dev->fwnode);
 258         if (ret) {
 259                 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
 260                 return ret;
 261         }
 262
 263         if (bus->prop.hw_disabled)
 264                 dev_info(dev,
 265                          "SoundWire master %d is disabled, will be ignored\n",
 266                          bus->link_id);
 267         /*
 268          * Ignore BIOS err_threshold, it's a really bad idea when dealing
 269          * with multiple hardware synchronized links
 270          */
 271         bus->prop.err_threshold = 0;
 272
 273         return 0;
 274 }
 275
 276 int intel_link_startup(struct auxiliary_device *auxdev)
 277 {
 278         struct device *dev = &auxdev->dev;
 279         struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
 280         struct sdw_intel *sdw = cdns_to_intel(cdns);
 281         struct sdw_bus *bus = &cdns->bus;
 282         int link_flags;
 283         bool multi_link;
 284         u32 clock_stop_quirks;
 285         int ret;
 286
 287         if (bus->prop.hw_disabled) {
 288                 dev_info(dev,
 289                          "SoundWire master %d is disabled, ignoring\n",
 290                          sdw->instance);
 291                 return 0;
 292         }
 293
 294         link_flags = md_flags >> (bus->link_id * 8);
 295         multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
 296         if (!multi_link) {
 297                 dev_dbg(dev, "Multi-link is disabled\n");
 298         } else {
 299                 /*
 300                  * hardware-based synchronization is required regardless
 301                  * of the number of segments used by a stream: SSP-based
 302                  * synchronization is gated by gsync when the multi-master
 303                  * mode is set.
 304                  */
 305                 bus->hw_sync_min_links = 1;
 306         }
 307         bus->multi_link = multi_link;
 308
 309         /* Initialize shim, controller */
 310         ret = sdw_intel_link_power_up(sdw);
 311         if (ret)
 312                 goto err_init;
 313
 314         /* Register DAIs */
 315         ret = sdw_intel_register_dai(sdw);
 316         if (ret) {
 317                 dev_err(dev, "DAI registration failed: %d\n", ret);
 318                 goto err_power_up;
 319         }
 320
 321         sdw_intel_debugfs_init(sdw);
 322
 323         /* Enable runtime PM */
 324         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
 325                 pm_runtime_set_autosuspend_delay(dev,
 326                                                  INTEL_MASTER_SUSPEND_DELAY_MS);
 327                 pm_runtime_use_autosuspend(dev);
 328                 pm_runtime_mark_last_busy(dev);
 329
 330                 pm_runtime_set_active(dev);
 331                 pm_runtime_enable(dev);
 332
 333                 pm_runtime_resume(bus->dev);
 334         }
 335
 336         /* start bus */
 337         ret = sdw_intel_start_bus(sdw);
 338         if (ret) {
 339                 dev_err(dev, "bus start failed: %d\n", ret);
 340                 goto err_pm_runtime;
 341         }
 342
 343         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 344         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
 345                 /*
 346                  * To keep the clock running we need to prevent
 347                  * pm_runtime suspend from happening by increasing the
 348                  * reference count.
 349                  * This quirk is specified by the parent PCI device in
 350                  * case of specific latency requirements. It will have
 351                  * no effect if pm_runtime is disabled by the user via
 352                  * a module parameter for testing purposes.
 353                  */
 354                 pm_runtime_get_noresume(dev);
 355         }
 356
 357         /*
 358          * The runtime PM status of Slave devices is "Unsupported"
 359          * until they report as ATTACHED. If they don't, e.g. because
 360          * there are no Slave devices populated or if the power-on is
 361          * delayed or dependent on a power switch, the Master will
 362          * remain active and prevent its parent from suspending.
 363          *
 364          * Conditionally force the pm_runtime core to re-evaluate the
 365          * Master status in the absence of any Slave activity. A quirk
 366          * is provided to e.g. deal with Slaves that may be powered on
 367          * with a delay. A more complete solution would require the
 368          * definition of Master properties.
 369          */
 370         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) {
 371                 pm_runtime_mark_last_busy(bus->dev);
 372                 pm_runtime_mark_last_busy(dev);
 373                 pm_runtime_idle(dev);
 374         }
 375
 376         sdw->startup_done = true;
 377         return 0;
 378
 379 err_pm_runtime:
 380         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME))
 381                 pm_runtime_disable(dev);
 382 err_power_up:
 383         sdw_intel_link_power_down(sdw);
 384 err_init:
 385         return ret;
 386 }
 387
 388 static void intel_link_remove(struct auxiliary_device *auxdev)
 389 {
 390         struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
 391         struct sdw_intel *sdw = cdns_to_intel(cdns);
 392         struct sdw_bus *bus = &cdns->bus;
 393
 394         /*
 395          * Since pm_runtime is already disabled, we don't decrease
 396          * the refcount when the clock_stop_quirk is
 397          * SDW_INTEL_CLK_STOP_NOT_ALLOWED
 398          */
 399         if (!bus->prop.hw_disabled) {
 400                 sdw_intel_debugfs_exit(sdw);
 401                 sdw_cdns_enable_interrupt(cdns, false);
 402         }
 403         sdw_bus_master_delete(bus);
 404 }
 405
 406 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
 407 {
 408         struct device *dev = &auxdev->dev;
 409         struct sdw_intel *sdw;
 410         struct sdw_bus *bus;
 411
 412         sdw = auxiliary_get_drvdata(auxdev);
 413         bus = &sdw->cdns.bus;
 414
 415         if (bus->prop.hw_disabled || !sdw->startup_done) {
 416                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 417                         bus->link_id);
 418                 return 0;
 419         }
 420
 421         if (!sdw_intel_shim_check_wake(sdw))
 422                 return 0;
 423
 424         /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
 425         sdw_intel_shim_wake(sdw, false);
 426
 427         /*
 428          * resume the Master, which will generate a bus reset and result in
 429          * Slaves re-attaching and be re-enumerated. The SoundWire physical
 430          * device which generated the wake will trigger an interrupt, which
 431          * will in turn cause the corresponding Linux Slave device to be
 432          * resumed and the Slave codec driver to check the status.
 433          */
 434         pm_request_resume(dev);
 435
 436         return 0;
 437 }
 438
 439 /*
 440  * PM calls
 441  */
 442
 443 static int intel_resume_child_device(struct device *dev, void *data)
 444 {
 445         int ret;
 446         struct sdw_slave *slave = dev_to_sdw_dev(dev);
 447
 448         if (!slave->probed) {
 449                 dev_dbg(dev, "skipping device, no probed driver\n");
 450                 return 0;
 451         }
 452         if (!slave->dev_num_sticky) {
 453                 dev_dbg(dev, "skipping device, never detected on bus\n");
 454                 return 0;
 455         }
 456
 457         ret = pm_request_resume(dev);
 458         if (ret < 0) {
 459                 dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
 460                 return ret;
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int __maybe_unused intel_pm_prepare(struct device *dev)
 467 {
 468         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 469         struct sdw_intel *sdw = cdns_to_intel(cdns);
 470         struct sdw_bus *bus = &cdns->bus;
 471         u32 clock_stop_quirks;
 472         int ret;
 473
 474         if (bus->prop.hw_disabled || !sdw->startup_done) {
 475                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 476                         bus->link_id);
 477                 return 0;
 478         }
 479
 480         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 481
 482         if (pm_runtime_suspended(dev) &&
 483             pm_runtime_suspended(dev->parent) &&
 484             ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
 485              !clock_stop_quirks)) {
 486                 /*
 487                  * if we've enabled clock stop, and the parent is suspended, the SHIM registers
 488                  * are not accessible and the shim wake cannot be disabled.
 489                  * The only solution is to resume the entire bus to full power
 490                  */
 491
 492                 /*
 493                  * If any operation in this block fails, we keep going since we don't want
 494                  * to prevent system suspend from happening and errors should be recoverable
 495                  * on resume.
 496                  */
 497
 498                 /*
 499                  * first resume the device for this link. This will also by construction
 500                  * resume the PCI parent device.
 501                  */
 502                 ret = pm_request_resume(dev);
 503                 if (ret < 0) {
 504                         dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
 505                         return 0;
 506                 }
 507
 508                 /*
 509                  * Continue resuming the entire bus (parent + child devices) to exit
 510                  * the clock stop mode. If there are no devices connected on this link
 511                  * this is a no-op.
 512                  * The resume to full power could have been implemented with a .prepare
 513                  * step in SoundWire codec drivers. This would however require a lot
 514                  * of code to handle an Intel-specific corner case. It is simpler in
 515                  * practice to add a loop at the link level.
 516                  */
 517                 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
 518
 519                 if (ret < 0)
 520                         dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
 521         }
 522
 523         return 0;
 524 }
 525
 526 static int __maybe_unused intel_suspend(struct device *dev)
 527 {
 528         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 529         struct sdw_intel *sdw = cdns_to_intel(cdns);
 530         struct sdw_bus *bus = &cdns->bus;
 531         u32 clock_stop_quirks;
 532         int ret;
 533
 534         if (bus->prop.hw_disabled || !sdw->startup_done) {
 535                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 536                         bus->link_id);
 537                 return 0;
 538         }
 539
 540         if (pm_runtime_suspended(dev)) {
 541                 dev_dbg(dev, "pm_runtime status: suspended\n");
 542
 543                 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 544
 545                 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
 546                     !clock_stop_quirks) {
 547
 548                         if (pm_runtime_suspended(dev->parent)) {
 549                                 /*
 550                                  * paranoia check: this should not happen with the .prepare
 551                                  * resume to full power
 552                                  */
 553                                 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
 554                         } else {
 555                                 sdw_intel_shim_wake(sdw, false);
 556                         }
 557                 }
 558
 559                 return 0;
 560         }
 561
 562         ret = sdw_intel_stop_bus(sdw, false);
 563         if (ret < 0) {
 564                 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
 565                 return ret;
 566         }
 567
 568         return 0;
 569 }
 570
 571 static int __maybe_unused intel_suspend_runtime(struct device *dev)
 572 {
 573         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 574         struct sdw_intel *sdw = cdns_to_intel(cdns);
 575         struct sdw_bus *bus = &cdns->bus;
 576         u32 clock_stop_quirks;
 577         int ret;
 578
 579         if (bus->prop.hw_disabled || !sdw->startup_done) {
 580                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 581                         bus->link_id);
 582                 return 0;
 583         }
 584
 585         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 586
 587         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
 588                 ret = sdw_intel_stop_bus(sdw, false);
 589                 if (ret < 0) {
 590                         dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
 591                                 __func__, ret);
 592                         return ret;
 593                 }
 594         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
 595                 ret = sdw_intel_stop_bus(sdw, true);
 596                 if (ret < 0) {
 597                         dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
 598                                 __func__, ret);
 599                         return ret;
 600                 }
 601         } else {
 602                 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
 603                         __func__, clock_stop_quirks);
 604                 ret = -EINVAL;
 605         }
 606
 607         return ret;
 608 }
 609
 610 static int __maybe_unused intel_resume(struct device *dev)
 611 {
 612         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 613         struct sdw_intel *sdw = cdns_to_intel(cdns);
 614         struct sdw_bus *bus = &cdns->bus;
 615         int link_flags;
 616         int ret;
 617
 618         if (bus->prop.hw_disabled || !sdw->startup_done) {
 619                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 620                         bus->link_id);
 621                 return 0;
 622         }
 623
 624         link_flags = md_flags >> (bus->link_id * 8);
 625
 626         if (pm_runtime_suspended(dev)) {
 627                 dev_dbg(dev, "pm_runtime status was suspended, forcing active\n");
 628
 629                 /* follow required sequence from runtime_pm.rst */
 630                 pm_runtime_disable(dev);
 631                 pm_runtime_set_active(dev);
 632                 pm_runtime_mark_last_busy(dev);
 633                 pm_runtime_enable(dev);
 634
 635                 pm_runtime_resume(bus->dev);
 636
 637                 link_flags = md_flags >> (bus->link_id * 8);
 638
 639                 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
 640                         pm_runtime_idle(dev);
 641         }
 642
 643         ret = sdw_intel_link_power_up(sdw);
 644         if (ret) {
 645                 dev_err(dev, "%s failed: %d\n", __func__, ret);
 646                 return ret;
 647         }
 648
 649         /*
 650          * make sure all Slaves are tagged as UNATTACHED and provide
 651          * reason for reinitialization
 652          */
 653         sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
 654
 655         ret = sdw_intel_start_bus(sdw);
 656         if (ret < 0) {
 657                 dev_err(dev, "cannot start bus during resume\n");
 658                 sdw_intel_link_power_down(sdw);
 659                 return ret;
 660         }
 661
 662         /*
 663          * after system resume, the pm_runtime suspend() may kick in
 664          * during the enumeration, before any children device force the
 665          * master device to remain active.  Using pm_runtime_get()
 666          * routines is not really possible, since it'd prevent the
 667          * master from suspending.
 668          * A reasonable compromise is to update the pm_runtime
 669          * counters and delay the pm_runtime suspend by several
 670          * seconds, by when all enumeration should be complete.
 671          */
 672         pm_runtime_mark_last_busy(bus->dev);
 673         pm_runtime_mark_last_busy(dev);
 674
 675         return 0;
 676 }
 677
 678 static int __maybe_unused intel_resume_runtime(struct device *dev)
 679 {
 680         struct sdw_cdns *cdns = dev_get_drvdata(dev);
 681         struct sdw_intel *sdw = cdns_to_intel(cdns);
 682         struct sdw_bus *bus = &cdns->bus;
 683         u32 clock_stop_quirks;
 684         int ret;
 685
 686         if (bus->prop.hw_disabled || !sdw->startup_done) {
 687                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 688                         bus->link_id);
 689                 return 0;
 690         }
 691
 692         /* unconditionally disable WAKEEN interrupt */
 693         sdw_intel_shim_wake(sdw, false);
 694
 695         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
 696
 697         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
 698                 ret = sdw_intel_link_power_up(sdw);
 699                 if (ret) {
 700                         dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
 701                         return ret;
 702                 }
 703
 704                 /*
 705                  * make sure all Slaves are tagged as UNATTACHED and provide
 706                  * reason for reinitialization
 707                  */
 708                 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
 709
 710                 ret = sdw_intel_start_bus(sdw);
 711                 if (ret < 0) {
 712                         dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
 713                         sdw_intel_link_power_down(sdw);
 714                         return ret;
 715                 }
 716
 717         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
 718                 ret = sdw_intel_link_power_up(sdw);
 719                 if (ret) {
 720                         dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
 721                         return ret;
 722                 }
 723
 724                 ret = sdw_intel_start_bus_after_reset(sdw);
 725                 if (ret < 0) {
 726                         dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
 727                         sdw_intel_link_power_down(sdw);
 728                         return ret;
 729                 }
 730         } else if (!clock_stop_quirks) {
 731
 732                 sdw_intel_check_clock_stop(sdw);
 733
 734                 ret = sdw_intel_link_power_up(sdw);
 735                 if (ret) {
 736                         dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
 737                         return ret;
 738                 }
 739
 740                 ret = sdw_intel_start_bus_after_clock_stop(sdw);
 741                 if (ret < 0) {
 742                         dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
 743                         sdw_intel_link_power_down(sdw);
 744                         return ret;
 745                 }
 746         } else {
 747                 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
 748                         __func__, clock_stop_quirks);
 749                 ret = -EINVAL;
 750         }
 751
 752         return ret;
 753 }
 754
 755 static const struct dev_pm_ops intel_pm = {
 756         .prepare = intel_pm_prepare,
 757         SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
 758         SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
 759 };
 760
 761 static const struct auxiliary_device_id intel_link_id_table[] = {
 762         { .name = "soundwire_intel.link" },
 763         {},
 764 };
 765 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
 766
 767 static struct auxiliary_driver sdw_intel_drv = {
 768         .probe = intel_link_probe,
 769         .remove = intel_link_remove,
 770         .driver = {
 771                 /* auxiliary_driver_register() sets .name to be the modname */
 772                 .pm = &intel_pm,
 773         },
 774         .id_table = intel_link_id_table
 775 };
 776 module_auxiliary_driver(sdw_intel_drv);
 777
 778 MODULE_LICENSE("Dual BSD/GPL");
 779 MODULE_DESCRIPTION("Intel Soundwire Link Driver");