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
is_wake_capable(struct sdw_slave * slave)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
generic_pre_bank_switch(struct sdw_bus * bus)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
generic_post_bank_switch(struct sdw_bus * bus)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
generic_new_peripheral_assigned(struct sdw_bus * bus,struct sdw_slave * slave,int dev_num)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
sdw_master_read_intel_prop(struct sdw_bus * bus)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
intel_prop_read(struct sdw_bus * bus)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
intel_get_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)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
intel_put_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)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 */
intel_link_probe(struct auxiliary_device * auxdev,const struct auxiliary_device_id * aux_dev_id)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 bus->link_id = auxdev->id;
238 bus->clk_stop_timeout = 1;
239
240 sdw_cdns_probe(cdns);
241
242 /* Set ops */
243 bus->ops = &sdw_intel_ops;
244
245 /* set driver data, accessed by snd_soc_dai_get_drvdata() */
246 auxiliary_set_drvdata(auxdev, cdns);
247
248 /* use generic bandwidth allocation algorithm */
249 sdw->cdns.bus.compute_params = sdw_compute_params;
250
251 /* avoid resuming from pm_runtime suspend if it's not required */
252 dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
253
254 ret = sdw_bus_master_add(bus, dev, dev->fwnode);
255 if (ret) {
256 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
257 return ret;
258 }
259
260 if (bus->prop.hw_disabled)
261 dev_info(dev,
262 "SoundWire master %d is disabled, will be ignored\n",
263 bus->link_id);
264 /*
265 * Ignore BIOS err_threshold, it's a really bad idea when dealing
266 * with multiple hardware synchronized links
267 */
268 bus->prop.err_threshold = 0;
269
270 return 0;
271 }
272
intel_link_startup(struct auxiliary_device * auxdev)273 int intel_link_startup(struct auxiliary_device *auxdev)
274 {
275 struct device *dev = &auxdev->dev;
276 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
277 struct sdw_intel *sdw = cdns_to_intel(cdns);
278 struct sdw_bus *bus = &cdns->bus;
279 int link_flags;
280 bool multi_link;
281 u32 clock_stop_quirks;
282 int ret;
283
284 if (bus->prop.hw_disabled) {
285 dev_info(dev,
286 "SoundWire master %d is disabled, ignoring\n",
287 sdw->instance);
288 return 0;
289 }
290
291 link_flags = md_flags >> (bus->link_id * 8);
292 multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
293 if (!multi_link) {
294 dev_dbg(dev, "Multi-link is disabled\n");
295 } else {
296 /*
297 * hardware-based synchronization is required regardless
298 * of the number of segments used by a stream: SSP-based
299 * synchronization is gated by gsync when the multi-master
300 * mode is set.
301 */
302 bus->hw_sync_min_links = 1;
303 }
304 bus->multi_link = multi_link;
305
306 /* Initialize shim, controller */
307 ret = sdw_intel_link_power_up(sdw);
308 if (ret)
309 goto err_init;
310
311 /* Register DAIs */
312 ret = sdw_intel_register_dai(sdw);
313 if (ret) {
314 dev_err(dev, "DAI registration failed: %d\n", ret);
315 goto err_power_up;
316 }
317
318 sdw_intel_debugfs_init(sdw);
319
320 /* Enable runtime PM */
321 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
322 pm_runtime_set_autosuspend_delay(dev,
323 INTEL_MASTER_SUSPEND_DELAY_MS);
324 pm_runtime_use_autosuspend(dev);
325 pm_runtime_mark_last_busy(dev);
326
327 pm_runtime_set_active(dev);
328 pm_runtime_enable(dev);
329
330 pm_runtime_resume(bus->dev);
331 }
332
333 /* start bus */
334 ret = sdw_intel_start_bus(sdw);
335 if (ret) {
336 dev_err(dev, "bus start failed: %d\n", ret);
337 goto err_pm_runtime;
338 }
339
340 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
341 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
342 /*
343 * To keep the clock running we need to prevent
344 * pm_runtime suspend from happening by increasing the
345 * reference count.
346 * This quirk is specified by the parent PCI device in
347 * case of specific latency requirements. It will have
348 * no effect if pm_runtime is disabled by the user via
349 * a module parameter for testing purposes.
350 */
351 pm_runtime_get_noresume(dev);
352 }
353
354 /*
355 * The runtime PM status of Slave devices is "Unsupported"
356 * until they report as ATTACHED. If they don't, e.g. because
357 * there are no Slave devices populated or if the power-on is
358 * delayed or dependent on a power switch, the Master will
359 * remain active and prevent its parent from suspending.
360 *
361 * Conditionally force the pm_runtime core to re-evaluate the
362 * Master status in the absence of any Slave activity. A quirk
363 * is provided to e.g. deal with Slaves that may be powered on
364 * with a delay. A more complete solution would require the
365 * definition of Master properties.
366 */
367 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) {
368 pm_runtime_mark_last_busy(bus->dev);
369 pm_runtime_mark_last_busy(dev);
370 pm_runtime_idle(dev);
371 }
372
373 sdw->startup_done = true;
374 return 0;
375
376 err_pm_runtime:
377 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME))
378 pm_runtime_disable(dev);
379 err_power_up:
380 sdw_intel_link_power_down(sdw);
381 err_init:
382 return ret;
383 }
384
intel_link_remove(struct auxiliary_device * auxdev)385 static void intel_link_remove(struct auxiliary_device *auxdev)
386 {
387 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
388 struct sdw_intel *sdw = cdns_to_intel(cdns);
389 struct sdw_bus *bus = &cdns->bus;
390
391 /*
392 * Since pm_runtime is already disabled, we don't decrease
393 * the refcount when the clock_stop_quirk is
394 * SDW_INTEL_CLK_STOP_NOT_ALLOWED
395 */
396 if (!bus->prop.hw_disabled) {
397 sdw_intel_debugfs_exit(sdw);
398 sdw_cdns_enable_interrupt(cdns, false);
399 }
400 sdw_bus_master_delete(bus);
401 }
402
intel_link_process_wakeen_event(struct auxiliary_device * auxdev)403 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
404 {
405 struct device *dev = &auxdev->dev;
406 struct sdw_intel *sdw;
407 struct sdw_bus *bus;
408
409 sdw = auxiliary_get_drvdata(auxdev);
410 bus = &sdw->cdns.bus;
411
412 if (bus->prop.hw_disabled || !sdw->startup_done) {
413 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
414 bus->link_id);
415 return 0;
416 }
417
418 if (!sdw_intel_shim_check_wake(sdw))
419 return 0;
420
421 /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
422 sdw_intel_shim_wake(sdw, false);
423
424 /*
425 * resume the Master, which will generate a bus reset and result in
426 * Slaves re-attaching and be re-enumerated. The SoundWire physical
427 * device which generated the wake will trigger an interrupt, which
428 * will in turn cause the corresponding Linux Slave device to be
429 * resumed and the Slave codec driver to check the status.
430 */
431 pm_request_resume(dev);
432
433 return 0;
434 }
435
436 /*
437 * PM calls
438 */
439
intel_resume_child_device(struct device * dev,void * data)440 static int intel_resume_child_device(struct device *dev, void *data)
441 {
442 int ret;
443 struct sdw_slave *slave = dev_to_sdw_dev(dev);
444
445 if (!slave->probed) {
446 dev_dbg(dev, "skipping device, no probed driver\n");
447 return 0;
448 }
449 if (!slave->dev_num_sticky) {
450 dev_dbg(dev, "skipping device, never detected on bus\n");
451 return 0;
452 }
453
454 ret = pm_request_resume(dev);
455 if (ret < 0) {
456 dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
457 return ret;
458 }
459
460 return 0;
461 }
462
intel_pm_prepare(struct device * dev)463 static int __maybe_unused intel_pm_prepare(struct device *dev)
464 {
465 struct sdw_cdns *cdns = dev_get_drvdata(dev);
466 struct sdw_intel *sdw = cdns_to_intel(cdns);
467 struct sdw_bus *bus = &cdns->bus;
468 u32 clock_stop_quirks;
469 int ret;
470
471 if (bus->prop.hw_disabled || !sdw->startup_done) {
472 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
473 bus->link_id);
474 return 0;
475 }
476
477 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
478
479 if (pm_runtime_suspended(dev) &&
480 pm_runtime_suspended(dev->parent) &&
481 ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
482 !clock_stop_quirks)) {
483 /*
484 * if we've enabled clock stop, and the parent is suspended, the SHIM registers
485 * are not accessible and the shim wake cannot be disabled.
486 * The only solution is to resume the entire bus to full power
487 */
488
489 /*
490 * If any operation in this block fails, we keep going since we don't want
491 * to prevent system suspend from happening and errors should be recoverable
492 * on resume.
493 */
494
495 /*
496 * first resume the device for this link. This will also by construction
497 * resume the PCI parent device.
498 */
499 ret = pm_request_resume(dev);
500 if (ret < 0) {
501 dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
502 return 0;
503 }
504
505 /*
506 * Continue resuming the entire bus (parent + child devices) to exit
507 * the clock stop mode. If there are no devices connected on this link
508 * this is a no-op.
509 * The resume to full power could have been implemented with a .prepare
510 * step in SoundWire codec drivers. This would however require a lot
511 * of code to handle an Intel-specific corner case. It is simpler in
512 * practice to add a loop at the link level.
513 */
514 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
515
516 if (ret < 0)
517 dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
518 }
519
520 return 0;
521 }
522
intel_suspend(struct device * dev)523 static int __maybe_unused intel_suspend(struct device *dev)
524 {
525 struct sdw_cdns *cdns = dev_get_drvdata(dev);
526 struct sdw_intel *sdw = cdns_to_intel(cdns);
527 struct sdw_bus *bus = &cdns->bus;
528 u32 clock_stop_quirks;
529 int ret;
530
531 if (bus->prop.hw_disabled || !sdw->startup_done) {
532 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
533 bus->link_id);
534 return 0;
535 }
536
537 if (pm_runtime_suspended(dev)) {
538 dev_dbg(dev, "pm_runtime status: suspended\n");
539
540 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
541
542 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
543 !clock_stop_quirks) {
544
545 if (pm_runtime_suspended(dev->parent)) {
546 /*
547 * paranoia check: this should not happen with the .prepare
548 * resume to full power
549 */
550 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
551 } else {
552 sdw_intel_shim_wake(sdw, false);
553 }
554 }
555
556 return 0;
557 }
558
559 ret = sdw_intel_stop_bus(sdw, false);
560 if (ret < 0) {
561 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
562 return ret;
563 }
564
565 return 0;
566 }
567
intel_suspend_runtime(struct device * dev)568 static int __maybe_unused intel_suspend_runtime(struct device *dev)
569 {
570 struct sdw_cdns *cdns = dev_get_drvdata(dev);
571 struct sdw_intel *sdw = cdns_to_intel(cdns);
572 struct sdw_bus *bus = &cdns->bus;
573 u32 clock_stop_quirks;
574 int ret;
575
576 if (bus->prop.hw_disabled || !sdw->startup_done) {
577 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
578 bus->link_id);
579 return 0;
580 }
581
582 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
583
584 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
585 ret = sdw_intel_stop_bus(sdw, false);
586 if (ret < 0) {
587 dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
588 __func__, ret);
589 return ret;
590 }
591 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
592 ret = sdw_intel_stop_bus(sdw, true);
593 if (ret < 0) {
594 dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
595 __func__, ret);
596 return ret;
597 }
598 } else {
599 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
600 __func__, clock_stop_quirks);
601 ret = -EINVAL;
602 }
603
604 return ret;
605 }
606
intel_resume(struct device * dev)607 static int __maybe_unused intel_resume(struct device *dev)
608 {
609 struct sdw_cdns *cdns = dev_get_drvdata(dev);
610 struct sdw_intel *sdw = cdns_to_intel(cdns);
611 struct sdw_bus *bus = &cdns->bus;
612 int link_flags;
613 int ret;
614
615 if (bus->prop.hw_disabled || !sdw->startup_done) {
616 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
617 bus->link_id);
618 return 0;
619 }
620
621 link_flags = md_flags >> (bus->link_id * 8);
622
623 if (pm_runtime_suspended(dev)) {
624 dev_dbg(dev, "pm_runtime status was suspended, forcing active\n");
625
626 /* follow required sequence from runtime_pm.rst */
627 pm_runtime_disable(dev);
628 pm_runtime_set_active(dev);
629 pm_runtime_mark_last_busy(dev);
630 pm_runtime_enable(dev);
631
632 pm_runtime_resume(bus->dev);
633
634 link_flags = md_flags >> (bus->link_id * 8);
635
636 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
637 pm_runtime_idle(dev);
638 }
639
640 ret = sdw_intel_link_power_up(sdw);
641 if (ret) {
642 dev_err(dev, "%s failed: %d\n", __func__, ret);
643 return ret;
644 }
645
646 /*
647 * make sure all Slaves are tagged as UNATTACHED and provide
648 * reason for reinitialization
649 */
650 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
651
652 ret = sdw_intel_start_bus(sdw);
653 if (ret < 0) {
654 dev_err(dev, "cannot start bus during resume\n");
655 sdw_intel_link_power_down(sdw);
656 return ret;
657 }
658
659 /*
660 * after system resume, the pm_runtime suspend() may kick in
661 * during the enumeration, before any children device force the
662 * master device to remain active. Using pm_runtime_get()
663 * routines is not really possible, since it'd prevent the
664 * master from suspending.
665 * A reasonable compromise is to update the pm_runtime
666 * counters and delay the pm_runtime suspend by several
667 * seconds, by when all enumeration should be complete.
668 */
669 pm_runtime_mark_last_busy(bus->dev);
670 pm_runtime_mark_last_busy(dev);
671
672 return 0;
673 }
674
intel_resume_runtime(struct device * dev)675 static int __maybe_unused intel_resume_runtime(struct device *dev)
676 {
677 struct sdw_cdns *cdns = dev_get_drvdata(dev);
678 struct sdw_intel *sdw = cdns_to_intel(cdns);
679 struct sdw_bus *bus = &cdns->bus;
680 u32 clock_stop_quirks;
681 int ret;
682
683 if (bus->prop.hw_disabled || !sdw->startup_done) {
684 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
685 bus->link_id);
686 return 0;
687 }
688
689 /* unconditionally disable WAKEEN interrupt */
690 sdw_intel_shim_wake(sdw, false);
691
692 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
693
694 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
695 ret = sdw_intel_link_power_up(sdw);
696 if (ret) {
697 dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
698 return ret;
699 }
700
701 /*
702 * make sure all Slaves are tagged as UNATTACHED and provide
703 * reason for reinitialization
704 */
705 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
706
707 ret = sdw_intel_start_bus(sdw);
708 if (ret < 0) {
709 dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
710 sdw_intel_link_power_down(sdw);
711 return ret;
712 }
713
714 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
715 ret = sdw_intel_link_power_up(sdw);
716 if (ret) {
717 dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
718 return ret;
719 }
720
721 ret = sdw_intel_start_bus_after_reset(sdw);
722 if (ret < 0) {
723 dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
724 sdw_intel_link_power_down(sdw);
725 return ret;
726 }
727 } else if (!clock_stop_quirks) {
728
729 sdw_intel_check_clock_stop(sdw);
730
731 ret = sdw_intel_link_power_up(sdw);
732 if (ret) {
733 dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
734 return ret;
735 }
736
737 ret = sdw_intel_start_bus_after_clock_stop(sdw);
738 if (ret < 0) {
739 dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
740 sdw_intel_link_power_down(sdw);
741 return ret;
742 }
743 } else {
744 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
745 __func__, clock_stop_quirks);
746 ret = -EINVAL;
747 }
748
749 return ret;
750 }
751
752 static const struct dev_pm_ops intel_pm = {
753 .prepare = intel_pm_prepare,
754 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
755 SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
756 };
757
758 static const struct auxiliary_device_id intel_link_id_table[] = {
759 { .name = "soundwire_intel.link" },
760 {},
761 };
762 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
763
764 static struct auxiliary_driver sdw_intel_drv = {
765 .probe = intel_link_probe,
766 .remove = intel_link_remove,
767 .driver = {
768 /* auxiliary_driver_register() sets .name to be the modname */
769 .pm = &intel_pm,
770 },
771 .id_table = intel_link_id_table
772 };
773 module_auxiliary_driver(sdw_intel_drv);
774
775 MODULE_LICENSE("Dual BSD/GPL");
776 MODULE_DESCRIPTION("Intel Soundwire Link Driver");
777
