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1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)2// Copyright(c) 2015-22 Intel Corporation.3 4/*5 * Soundwire Intel Manager Driver6 */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 300027 28/*29 * debug/config flags for the Intel SoundWire Master.30 *31 * Since we may have multiple masters active, we can have up to 832 * 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 40static int md_flags;41module_param_named(sdw_md_flags, md_flags, int, 0444);42MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");43 44struct wake_capable_part {45 const u16 mfg_id;46 const u16 part_id;47};48 49static struct wake_capable_part wake_capable_list[] = {50 {0x01fa, 0x4243},51 {0x025d, 0x5682},52 {0x025d, 0x700},53 {0x025d, 0x711},54 {0x025d, 0x1712},55 {0x025d, 0x1713},56 {0x025d, 0x1716},57 {0x025d, 0x1717},58 {0x025d, 0x712},59 {0x025d, 0x713},60 {0x025d, 0x714},61 {0x025d, 0x715},62 {0x025d, 0x716},63 {0x025d, 0x717},64 {0x025d, 0x722},65};66 67static bool is_wake_capable(struct sdw_slave *slave)68{69 int i;70 71 for (i = 0; i < ARRAY_SIZE(wake_capable_list); i++)72 if (slave->id.part_id == wake_capable_list[i].part_id &&73 slave->id.mfg_id == wake_capable_list[i].mfg_id)74 return true;75 return false;76}77 78static int generic_pre_bank_switch(struct sdw_bus *bus)79{80 struct sdw_cdns *cdns = bus_to_cdns(bus);81 struct sdw_intel *sdw = cdns_to_intel(cdns);82 83 return sdw->link_res->hw_ops->pre_bank_switch(sdw);84}85 86static int generic_post_bank_switch(struct sdw_bus *bus)87{88 struct sdw_cdns *cdns = bus_to_cdns(bus);89 struct sdw_intel *sdw = cdns_to_intel(cdns);90 91 return sdw->link_res->hw_ops->post_bank_switch(sdw);92}93 94static void generic_new_peripheral_assigned(struct sdw_bus *bus,95 struct sdw_slave *slave,96 int dev_num)97{98 struct sdw_cdns *cdns = bus_to_cdns(bus);99 struct sdw_intel *sdw = cdns_to_intel(cdns);100 int dev_num_min;101 int dev_num_max;102 bool wake_capable = slave->prop.wake_capable || is_wake_capable(slave);103 104 if (wake_capable) {105 dev_num_min = SDW_INTEL_DEV_NUM_IDA_MIN;106 dev_num_max = SDW_MAX_DEVICES;107 } else {108 dev_num_min = 1;109 dev_num_max = SDW_INTEL_DEV_NUM_IDA_MIN - 1;110 }111 112 /* paranoia check, this should never happen */113 if (dev_num < dev_num_min || dev_num > dev_num_max) {114 dev_err(bus->dev, "%s: invalid dev_num %d, wake supported %d\n",115 __func__, dev_num, slave->prop.wake_capable);116 return;117 }118 119 if (sdw->link_res->hw_ops->program_sdi && wake_capable)120 sdw->link_res->hw_ops->program_sdi(sdw, dev_num);121}122 123static int sdw_master_read_intel_prop(struct sdw_bus *bus)124{125 struct sdw_master_prop *prop = &bus->prop;126 struct sdw_intel_prop *intel_prop;127 struct fwnode_handle *link;128 char name[32];129 u32 quirk_mask;130 131 /* Find master handle */132 snprintf(name, sizeof(name),133 "mipi-sdw-link-%d-subproperties", bus->link_id);134 135 link = device_get_named_child_node(bus->dev, name);136 if (!link) {137 dev_err(bus->dev, "Master node %s not found\n", name);138 return -EIO;139 }140 141 fwnode_property_read_u32(link,142 "intel-sdw-ip-clock",143 &prop->mclk_freq);144 145 /* the values reported by BIOS are the 2x clock, not the bus clock */146 prop->mclk_freq /= 2;147 148 fwnode_property_read_u32(link,149 "intel-quirk-mask",150 &quirk_mask);151 152 if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)153 prop->hw_disabled = true;154 155 prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |156 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;157 158 intel_prop = devm_kzalloc(bus->dev, sizeof(*intel_prop), GFP_KERNEL);159 if (!intel_prop) {160 fwnode_handle_put(link);161 return -ENOMEM;162 }163 164 /* initialize with hardware defaults, in case the properties are not found */165 intel_prop->clde = 0x0;166 intel_prop->doaise2 = 0x0;167 intel_prop->dodse2 = 0x0;168 intel_prop->clds = 0x0;169 intel_prop->clss = 0x0;170 intel_prop->doaise = 0x1;171 intel_prop->doais = 0x3;172 intel_prop->dodse = 0x0;173 intel_prop->dods = 0x1;174 175 fwnode_property_read_u16(link,176 "intel-sdw-clde",177 &intel_prop->clde);178 fwnode_property_read_u16(link,179 "intel-sdw-doaise2",180 &intel_prop->doaise2);181 fwnode_property_read_u16(link,182 "intel-sdw-dodse2",183 &intel_prop->dodse2);184 fwnode_property_read_u16(link,185 "intel-sdw-clds",186 &intel_prop->clds);187 fwnode_property_read_u16(link,188 "intel-sdw-clss",189 &intel_prop->clss);190 fwnode_property_read_u16(link,191 "intel-sdw-doaise",192 &intel_prop->doaise);193 fwnode_property_read_u16(link,194 "intel-sdw-doais",195 &intel_prop->doais);196 fwnode_property_read_u16(link,197 "intel-sdw-dodse",198 &intel_prop->dodse);199 fwnode_property_read_u16(link,200 "intel-sdw-dods",201 &intel_prop->dods);202 bus->vendor_specific_prop = intel_prop;203 204 dev_dbg(bus->dev, "doaise %#x doais %#x dodse %#x dods %#x\n",205 intel_prop->doaise,206 intel_prop->doais,207 intel_prop->dodse,208 intel_prop->dods);209 210 fwnode_handle_put(link);211 212 return 0;213}214 215static int intel_prop_read(struct sdw_bus *bus)216{217 struct sdw_master_prop *prop;218 219 /* Initialize with default handler to read all DisCo properties */220 sdw_master_read_prop(bus);221 222 /*223 * Only one bus frequency is supported so far, filter224 * frequencies reported in the DSDT225 */226 prop = &bus->prop;227 if (prop->clk_freq && prop->num_clk_freq > 1) {228 unsigned int default_bus_frequency;229 230 default_bus_frequency =231 prop->default_frame_rate *232 prop->default_row *233 prop->default_col /234 SDW_DOUBLE_RATE_FACTOR;235 236 prop->num_clk_freq = 1;237 prop->clk_freq[0] = default_bus_frequency;238 prop->max_clk_freq = default_bus_frequency;239 }240 241 /* read Intel-specific properties */242 sdw_master_read_intel_prop(bus);243 244 return 0;245}246 247static DEFINE_IDA(intel_peripheral_ida);248 249static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)250{251 int bit;252 253 if (slave->prop.wake_capable || is_wake_capable(slave))254 return ida_alloc_range(&intel_peripheral_ida,255 SDW_INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES,256 GFP_KERNEL);257 258 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);259 if (bit == SDW_MAX_DEVICES)260 return -ENODEV;261 262 return bit;263}264 265static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)266{267 if (slave->prop.wake_capable || is_wake_capable(slave))268 ida_free(&intel_peripheral_ida, slave->dev_num);269}270 271static struct sdw_master_ops sdw_intel_ops = {272 .read_prop = intel_prop_read,273 .override_adr = sdw_dmi_override_adr,274 .xfer_msg = cdns_xfer_msg,275 .xfer_msg_defer = cdns_xfer_msg_defer,276 .set_bus_conf = cdns_bus_conf,277 .pre_bank_switch = generic_pre_bank_switch,278 .post_bank_switch = generic_post_bank_switch,279 .read_ping_status = cdns_read_ping_status,280 .get_device_num = intel_get_device_num_ida,281 .put_device_num = intel_put_device_num_ida,282 .new_peripheral_assigned = generic_new_peripheral_assigned,283};284 285/*286 * probe and init (aux_dev_id argument is required by function prototype but not used)287 */288static int intel_link_probe(struct auxiliary_device *auxdev,289 const struct auxiliary_device_id *aux_dev_id)290 291{292 struct device *dev = &auxdev->dev;293 struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);294 struct sdw_intel *sdw;295 struct sdw_cdns *cdns;296 struct sdw_bus *bus;297 int ret;298 299 sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);300 if (!sdw)301 return -ENOMEM;302 303 cdns = &sdw->cdns;304 bus = &cdns->bus;305 306 sdw->instance = auxdev->id;307 sdw->link_res = &ldev->link_res;308 cdns->dev = dev;309 cdns->registers = sdw->link_res->registers;310 cdns->ip_offset = sdw->link_res->ip_offset;311 cdns->instance = sdw->instance;312 cdns->msg_count = 0;313 314 /* single controller for all SoundWire links */315 bus->controller_id = 0;316 317 bus->link_id = auxdev->id;318 bus->clk_stop_timeout = 1;319 320 /*321 * paranoia check: make sure ACPI-reported number of links is aligned with322 * hardware capabilities.323 */324 ret = sdw_intel_get_link_count(sdw);325 if (ret < 0) {326 dev_err(dev, "%s: sdw_intel_get_link_count failed: %d\n", __func__, ret);327 return ret;328 }329 if (ret <= sdw->instance) {330 dev_err(dev, "%s: invalid link id %d, link count %d\n", __func__, auxdev->id, ret);331 return -EINVAL;332 }333 334 sdw_cdns_probe(cdns);335 336 /* Set ops */337 bus->ops = &sdw_intel_ops;338 339 /* set driver data, accessed by snd_soc_dai_get_drvdata() */340 auxiliary_set_drvdata(auxdev, cdns);341 342 /* use generic bandwidth allocation algorithm */343 sdw->cdns.bus.compute_params = sdw_compute_params;344 345 /* avoid resuming from pm_runtime suspend if it's not required */346 dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);347 348 ret = sdw_bus_master_add(bus, dev, dev->fwnode);349 if (ret) {350 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);351 return ret;352 }353 354 if (bus->prop.hw_disabled)355 dev_info(dev,356 "SoundWire master %d is disabled, will be ignored\n",357 bus->link_id);358 /*359 * Ignore BIOS err_threshold, it's a really bad idea when dealing360 * with multiple hardware synchronized links361 */362 bus->prop.err_threshold = 0;363 364 return 0;365}366 367int intel_link_startup(struct auxiliary_device *auxdev)368{369 struct device *dev = &auxdev->dev;370 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);371 struct sdw_intel *sdw = cdns_to_intel(cdns);372 struct sdw_bus *bus = &cdns->bus;373 int link_flags;374 bool multi_link;375 u32 clock_stop_quirks;376 int ret;377 378 if (bus->prop.hw_disabled) {379 dev_info(dev,380 "SoundWire master %d is disabled, ignoring\n",381 sdw->instance);382 return 0;383 }384 385 link_flags = md_flags >> (bus->link_id * 8);386 multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);387 if (!multi_link) {388 dev_dbg(dev, "Multi-link is disabled\n");389 } else {390 /*391 * hardware-based synchronization is required regardless392 * of the number of segments used by a stream: SSP-based393 * synchronization is gated by gsync when the multi-master394 * mode is set.395 */396 bus->hw_sync_min_links = 1;397 }398 bus->multi_link = multi_link;399 400 /* Initialize shim, controller */401 ret = sdw_intel_link_power_up(sdw);402 if (ret)403 goto err_init;404 405 /* Register DAIs */406 ret = sdw_intel_register_dai(sdw);407 if (ret) {408 dev_err(dev, "DAI registration failed: %d\n", ret);409 goto err_power_up;410 }411 412 sdw_intel_debugfs_init(sdw);413 414 /* Enable runtime PM */415 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {416 pm_runtime_set_autosuspend_delay(dev,417 INTEL_MASTER_SUSPEND_DELAY_MS);418 pm_runtime_use_autosuspend(dev);419 pm_runtime_mark_last_busy(dev);420 421 pm_runtime_set_active(dev);422 pm_runtime_enable(dev);423 424 pm_runtime_resume(bus->dev);425 }426 427 /* start bus */428 ret = sdw_intel_start_bus(sdw);429 if (ret) {430 dev_err(dev, "bus start failed: %d\n", ret);431 goto err_pm_runtime;432 }433 434 clock_stop_quirks = sdw->link_res->clock_stop_quirks;435 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {436 /*437 * To keep the clock running we need to prevent438 * pm_runtime suspend from happening by increasing the439 * reference count.440 * This quirk is specified by the parent PCI device in441 * case of specific latency requirements. It will have442 * no effect if pm_runtime is disabled by the user via443 * a module parameter for testing purposes.444 */445 pm_runtime_get_noresume(dev);446 }447 448 /*449 * The runtime PM status of Slave devices is "Unsupported"450 * until they report as ATTACHED. If they don't, e.g. because451 * there are no Slave devices populated or if the power-on is452 * delayed or dependent on a power switch, the Master will453 * remain active and prevent its parent from suspending.454 *455 * Conditionally force the pm_runtime core to re-evaluate the456 * Master status in the absence of any Slave activity. A quirk457 * is provided to e.g. deal with Slaves that may be powered on458 * with a delay. A more complete solution would require the459 * definition of Master properties.460 */461 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) {462 pm_runtime_mark_last_busy(bus->dev);463 pm_runtime_mark_last_busy(dev);464 pm_runtime_idle(dev);465 }466 467 sdw->startup_done = true;468 return 0;469 470err_pm_runtime:471 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME))472 pm_runtime_disable(dev);473err_power_up:474 sdw_intel_link_power_down(sdw);475err_init:476 return ret;477}478 479static void intel_link_remove(struct auxiliary_device *auxdev)480{481 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);482 struct sdw_intel *sdw = cdns_to_intel(cdns);483 struct sdw_bus *bus = &cdns->bus;484 485 /*486 * Since pm_runtime is already disabled, we don't decrease487 * the refcount when the clock_stop_quirk is488 * SDW_INTEL_CLK_STOP_NOT_ALLOWED489 */490 if (!bus->prop.hw_disabled) {491 sdw_intel_debugfs_exit(sdw);492 cancel_delayed_work_sync(&cdns->attach_dwork);493 sdw_cdns_enable_interrupt(cdns, false);494 }495 sdw_bus_master_delete(bus);496}497 498int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)499{500 struct device *dev = &auxdev->dev;501 struct sdw_intel *sdw;502 struct sdw_bus *bus;503 504 sdw = auxiliary_get_drvdata(auxdev);505 bus = &sdw->cdns.bus;506 507 if (bus->prop.hw_disabled || !sdw->startup_done) {508 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",509 bus->link_id);510 return 0;511 }512 513 if (!sdw_intel_shim_check_wake(sdw))514 return 0;515 516 /* disable WAKEEN interrupt ASAP to prevent interrupt flood */517 sdw_intel_shim_wake(sdw, false);518 519 /*520 * resume the Master, which will generate a bus reset and result in521 * Slaves re-attaching and be re-enumerated. The SoundWire physical522 * device which generated the wake will trigger an interrupt, which523 * will in turn cause the corresponding Linux Slave device to be524 * resumed and the Slave codec driver to check the status.525 */526 pm_request_resume(dev);527 528 return 0;529}530 531/*532 * PM calls533 */534 535int intel_resume_child_device(struct device *dev, void *data)536{537 int ret;538 struct sdw_slave *slave = dev_to_sdw_dev(dev);539 540 if (!slave->probed) {541 dev_dbg(dev, "skipping device, no probed driver\n");542 return 0;543 }544 if (!slave->dev_num_sticky) {545 dev_dbg(dev, "skipping device, never detected on bus\n");546 return 0;547 }548 549 ret = pm_runtime_resume(dev);550 if (ret < 0) {551 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);552 return ret;553 }554 555 return 0;556}557 558static int __maybe_unused intel_pm_prepare(struct device *dev)559{560 struct sdw_cdns *cdns = dev_get_drvdata(dev);561 struct sdw_intel *sdw = cdns_to_intel(cdns);562 struct sdw_bus *bus = &cdns->bus;563 u32 clock_stop_quirks;564 int ret;565 566 if (bus->prop.hw_disabled || !sdw->startup_done) {567 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",568 bus->link_id);569 return 0;570 }571 572 clock_stop_quirks = sdw->link_res->clock_stop_quirks;573 574 if (pm_runtime_suspended(dev) &&575 pm_runtime_suspended(dev->parent) &&576 ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||577 !clock_stop_quirks)) {578 /*579 * if we've enabled clock stop, and the parent is suspended, the SHIM registers580 * are not accessible and the shim wake cannot be disabled.581 * The only solution is to resume the entire bus to full power582 */583 584 /*585 * If any operation in this block fails, we keep going since we don't want586 * to prevent system suspend from happening and errors should be recoverable587 * on resume.588 */589 590 /*591 * first resume the device for this link. This will also by construction592 * resume the PCI parent device.593 */594 ret = pm_runtime_resume(dev);595 if (ret < 0) {596 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);597 return 0;598 }599 600 /*601 * Continue resuming the entire bus (parent + child devices) to exit602 * the clock stop mode. If there are no devices connected on this link603 * this is a no-op.604 * The resume to full power could have been implemented with a .prepare605 * step in SoundWire codec drivers. This would however require a lot606 * of code to handle an Intel-specific corner case. It is simpler in607 * practice to add a loop at the link level.608 */609 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);610 611 if (ret < 0)612 dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);613 }614 615 return 0;616}617 618static int __maybe_unused intel_suspend(struct device *dev)619{620 struct sdw_cdns *cdns = dev_get_drvdata(dev);621 struct sdw_intel *sdw = cdns_to_intel(cdns);622 struct sdw_bus *bus = &cdns->bus;623 u32 clock_stop_quirks;624 int ret;625 626 if (bus->prop.hw_disabled || !sdw->startup_done) {627 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",628 bus->link_id);629 return 0;630 }631 632 if (pm_runtime_suspended(dev)) {633 dev_dbg(dev, "pm_runtime status: suspended\n");634 635 clock_stop_quirks = sdw->link_res->clock_stop_quirks;636 637 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||638 !clock_stop_quirks) {639 640 if (pm_runtime_suspended(dev->parent)) {641 /*642 * paranoia check: this should not happen with the .prepare643 * resume to full power644 */645 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);646 } else {647 sdw_intel_shim_wake(sdw, false);648 }649 }650 651 return 0;652 }653 654 ret = sdw_intel_stop_bus(sdw, false);655 if (ret < 0) {656 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);657 return ret;658 }659 660 return 0;661}662 663static int __maybe_unused intel_suspend_runtime(struct device *dev)664{665 struct sdw_cdns *cdns = dev_get_drvdata(dev);666 struct sdw_intel *sdw = cdns_to_intel(cdns);667 struct sdw_bus *bus = &cdns->bus;668 u32 clock_stop_quirks;669 int ret;670 671 if (bus->prop.hw_disabled || !sdw->startup_done) {672 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",673 bus->link_id);674 return 0;675 }676 677 clock_stop_quirks = sdw->link_res->clock_stop_quirks;678 679 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {680 ret = sdw_intel_stop_bus(sdw, false);681 if (ret < 0) {682 dev_err(dev, "%s: cannot stop bus during teardown: %d\n",683 __func__, ret);684 return ret;685 }686 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {687 ret = sdw_intel_stop_bus(sdw, true);688 if (ret < 0) {689 dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",690 __func__, ret);691 return ret;692 }693 } else {694 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",695 __func__, clock_stop_quirks);696 ret = -EINVAL;697 }698 699 return ret;700}701 702static int __maybe_unused intel_resume(struct device *dev)703{704 struct sdw_cdns *cdns = dev_get_drvdata(dev);705 struct sdw_intel *sdw = cdns_to_intel(cdns);706 struct sdw_bus *bus = &cdns->bus;707 int link_flags;708 int ret;709 710 if (bus->prop.hw_disabled || !sdw->startup_done) {711 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",712 bus->link_id);713 return 0;714 }715 716 if (pm_runtime_suspended(dev)) {717 dev_dbg(dev, "pm_runtime status was suspended, forcing active\n");718 719 /* follow required sequence from runtime_pm.rst */720 pm_runtime_disable(dev);721 pm_runtime_set_active(dev);722 pm_runtime_mark_last_busy(dev);723 pm_runtime_enable(dev);724 725 pm_runtime_resume(bus->dev);726 727 link_flags = md_flags >> (bus->link_id * 8);728 729 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))730 pm_runtime_idle(dev);731 }732 733 ret = sdw_intel_link_power_up(sdw);734 if (ret) {735 dev_err(dev, "%s failed: %d\n", __func__, ret);736 return ret;737 }738 739 /*740 * make sure all Slaves are tagged as UNATTACHED and provide741 * reason for reinitialization742 */743 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);744 745 ret = sdw_intel_start_bus(sdw);746 if (ret < 0) {747 dev_err(dev, "cannot start bus during resume\n");748 sdw_intel_link_power_down(sdw);749 return ret;750 }751 752 /*753 * after system resume, the pm_runtime suspend() may kick in754 * during the enumeration, before any children device force the755 * master device to remain active. Using pm_runtime_get()756 * routines is not really possible, since it'd prevent the757 * master from suspending.758 * A reasonable compromise is to update the pm_runtime759 * counters and delay the pm_runtime suspend by several760 * seconds, by when all enumeration should be complete.761 */762 pm_runtime_mark_last_busy(bus->dev);763 pm_runtime_mark_last_busy(dev);764 765 return 0;766}767 768static int __maybe_unused intel_resume_runtime(struct device *dev)769{770 struct sdw_cdns *cdns = dev_get_drvdata(dev);771 struct sdw_intel *sdw = cdns_to_intel(cdns);772 struct sdw_bus *bus = &cdns->bus;773 u32 clock_stop_quirks;774 int ret;775 776 if (bus->prop.hw_disabled || !sdw->startup_done) {777 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",778 bus->link_id);779 return 0;780 }781 782 /* unconditionally disable WAKEEN interrupt */783 sdw_intel_shim_wake(sdw, false);784 785 clock_stop_quirks = sdw->link_res->clock_stop_quirks;786 787 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {788 ret = sdw_intel_link_power_up(sdw);789 if (ret) {790 dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);791 return ret;792 }793 794 /*795 * make sure all Slaves are tagged as UNATTACHED and provide796 * reason for reinitialization797 */798 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);799 800 ret = sdw_intel_start_bus(sdw);801 if (ret < 0) {802 dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);803 sdw_intel_link_power_down(sdw);804 return ret;805 }806 807 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {808 ret = sdw_intel_link_power_up(sdw);809 if (ret) {810 dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);811 return ret;812 }813 814 ret = sdw_intel_start_bus_after_reset(sdw);815 if (ret < 0) {816 dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);817 sdw_intel_link_power_down(sdw);818 return ret;819 }820 } else if (!clock_stop_quirks) {821 822 sdw_intel_check_clock_stop(sdw);823 824 ret = sdw_intel_link_power_up(sdw);825 if (ret) {826 dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);827 return ret;828 }829 830 ret = sdw_intel_start_bus_after_clock_stop(sdw);831 if (ret < 0) {832 dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);833 sdw_intel_link_power_down(sdw);834 return ret;835 }836 } else {837 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",838 __func__, clock_stop_quirks);839 ret = -EINVAL;840 }841 842 return ret;843}844 845static const struct dev_pm_ops intel_pm = {846 .prepare = intel_pm_prepare,847 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)848 SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)849};850 851static const struct auxiliary_device_id intel_link_id_table[] = {852 { .name = "soundwire_intel.link" },853 {},854};855MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);856 857static struct auxiliary_driver sdw_intel_drv = {858 .probe = intel_link_probe,859 .remove = intel_link_remove,860 .driver = {861 /* auxiliary_driver_register() sets .name to be the modname */862 .pm = &intel_pm,863 },864 .id_table = intel_link_id_table865};866module_auxiliary_driver(sdw_intel_drv);867 868MODULE_LICENSE("Dual BSD/GPL");869MODULE_DESCRIPTION("Intel Soundwire Link Driver");870