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 if (pm_runtime_suspended(dev)) { 625 dev_dbg(dev, "pm_runtime status was suspended, forcing active\n"); 626 627 /* follow required sequence from runtime_pm.rst */ 628 pm_runtime_disable(dev); 629 pm_runtime_set_active(dev); 630 pm_runtime_mark_last_busy(dev); 631 pm_runtime_enable(dev); 632 633 pm_runtime_resume(bus->dev); 634 635 link_flags = md_flags >> (bus->link_id * 8); 636 637 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) 638 pm_runtime_idle(dev); 639 } 640 641 ret = sdw_intel_link_power_up(sdw); 642 if (ret) { 643 dev_err(dev, "%s failed: %d\n", __func__, ret); 644 return ret; 645 } 646 647 /* 648 * make sure all Slaves are tagged as UNATTACHED and provide 649 * reason for reinitialization 650 */ 651 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); 652 653 ret = sdw_intel_start_bus(sdw); 654 if (ret < 0) { 655 dev_err(dev, "cannot start bus during resume\n"); 656 sdw_intel_link_power_down(sdw); 657 return ret; 658 } 659 660 /* 661 * after system resume, the pm_runtime suspend() may kick in 662 * during the enumeration, before any children device force the 663 * master device to remain active. Using pm_runtime_get() 664 * routines is not really possible, since it'd prevent the 665 * master from suspending. 666 * A reasonable compromise is to update the pm_runtime 667 * counters and delay the pm_runtime suspend by several 668 * seconds, by when all enumeration should be complete. 669 */ 670 pm_runtime_mark_last_busy(bus->dev); 671 pm_runtime_mark_last_busy(dev); 672 673 return 0; 674 } 675 676 static int __maybe_unused intel_resume_runtime(struct device *dev) 677 { 678 struct sdw_cdns *cdns = dev_get_drvdata(dev); 679 struct sdw_intel *sdw = cdns_to_intel(cdns); 680 struct sdw_bus *bus = &cdns->bus; 681 u32 clock_stop_quirks; 682 int ret; 683 684 if (bus->prop.hw_disabled || !sdw->startup_done) { 685 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", 686 bus->link_id); 687 return 0; 688 } 689 690 /* unconditionally disable WAKEEN interrupt */ 691 sdw_intel_shim_wake(sdw, false); 692 693 clock_stop_quirks = sdw->link_res->clock_stop_quirks; 694 695 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { 696 ret = sdw_intel_link_power_up(sdw); 697 if (ret) { 698 dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret); 699 return ret; 700 } 701 702 /* 703 * make sure all Slaves are tagged as UNATTACHED and provide 704 * reason for reinitialization 705 */ 706 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); 707 708 ret = sdw_intel_start_bus(sdw); 709 if (ret < 0) { 710 dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret); 711 sdw_intel_link_power_down(sdw); 712 return ret; 713 } 714 715 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) { 716 ret = sdw_intel_link_power_up(sdw); 717 if (ret) { 718 dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret); 719 return ret; 720 } 721 722 ret = sdw_intel_start_bus_after_reset(sdw); 723 if (ret < 0) { 724 dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret); 725 sdw_intel_link_power_down(sdw); 726 return ret; 727 } 728 } else if (!clock_stop_quirks) { 729 730 sdw_intel_check_clock_stop(sdw); 731 732 ret = sdw_intel_link_power_up(sdw); 733 if (ret) { 734 dev_err(dev, "%s: power_up failed: %d\n", __func__, ret); 735 return ret; 736 } 737 738 ret = sdw_intel_start_bus_after_clock_stop(sdw); 739 if (ret < 0) { 740 dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret); 741 sdw_intel_link_power_down(sdw); 742 return ret; 743 } 744 } else { 745 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n", 746 __func__, clock_stop_quirks); 747 ret = -EINVAL; 748 } 749 750 return ret; 751 } 752 753 static const struct dev_pm_ops intel_pm = { 754 .prepare = intel_pm_prepare, 755 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume) 756 SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL) 757 }; 758 759 static const struct auxiliary_device_id intel_link_id_table[] = { 760 { .name = "soundwire_intel.link" }, 761 {}, 762 }; 763 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table); 764 765 static struct auxiliary_driver sdw_intel_drv = { 766 .probe = intel_link_probe, 767 .remove = intel_link_remove, 768 .driver = { 769 /* auxiliary_driver_register() sets .name to be the modname */ 770 .pm = &intel_pm, 771 }, 772 .id_table = intel_link_id_table 773 }; 774 module_auxiliary_driver(sdw_intel_drv); 775 776 MODULE_LICENSE("Dual BSD/GPL"); 777 MODULE_DESCRIPTION("Intel Soundwire Link Driver"); 778