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 /* 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
intel_link_startup(struct auxiliary_device * auxdev)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
intel_link_remove(struct auxiliary_device * auxdev)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
intel_link_process_wakeen_event(struct auxiliary_device * auxdev)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
intel_resume_child_device(struct device * dev,void * data)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
intel_pm_prepare(struct device * dev)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
intel_suspend(struct device * dev)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
intel_suspend_runtime(struct device * dev)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
intel_resume(struct device * dev)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
intel_resume_runtime(struct device * dev)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");
780