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 static int mclk_divider;
45 module_param_named(sdw_mclk_divider, mclk_divider, int, 0444);
46 MODULE_PARM_DESC(sdw_mclk_divider, "SoundWire Intel mclk divider");
47
48 struct wake_capable_part {
49 const u16 mfg_id;
50 const u16 part_id;
51 };
52
53 static struct wake_capable_part wake_capable_list[] = {
54 {0x01fa, 0x4243},
55 {0x01fa, 0x4245},
56 {0x025d, 0x5682},
57 {0x025d, 0x700},
58 {0x025d, 0x711},
59 {0x025d, 0x1712},
60 {0x025d, 0x1713},
61 {0x025d, 0x1716},
62 {0x025d, 0x1717},
63 {0x025d, 0x712},
64 {0x025d, 0x713},
65 {0x025d, 0x714},
66 {0x025d, 0x715},
67 {0x025d, 0x716},
68 {0x025d, 0x717},
69 {0x025d, 0x721},
70 {0x025d, 0x722},
71 };
72
is_wake_capable(struct sdw_slave * slave)73 static bool is_wake_capable(struct sdw_slave *slave)
74 {
75 int i;
76
77 for (i = 0; i < ARRAY_SIZE(wake_capable_list); i++)
78 if (slave->id.part_id == wake_capable_list[i].part_id &&
79 slave->id.mfg_id == wake_capable_list[i].mfg_id)
80 return true;
81 return false;
82 }
83
generic_bpt_send_async(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_bpt_msg * msg)84 static int generic_bpt_send_async(struct sdw_bus *bus, struct sdw_slave *slave,
85 struct sdw_bpt_msg *msg)
86 {
87 struct sdw_cdns *cdns = bus_to_cdns(bus);
88 struct sdw_intel *sdw = cdns_to_intel(cdns);
89
90 if (sdw->link_res->hw_ops->bpt_send_async)
91 return sdw->link_res->hw_ops->bpt_send_async(sdw, slave, msg);
92 return -EOPNOTSUPP;
93 }
94
generic_bpt_wait(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_bpt_msg * msg)95 static int generic_bpt_wait(struct sdw_bus *bus, struct sdw_slave *slave, struct sdw_bpt_msg *msg)
96 {
97 struct sdw_cdns *cdns = bus_to_cdns(bus);
98 struct sdw_intel *sdw = cdns_to_intel(cdns);
99
100 if (sdw->link_res->hw_ops->bpt_wait)
101 return sdw->link_res->hw_ops->bpt_wait(sdw, slave, msg);
102 return -EOPNOTSUPP;
103 }
104
generic_pre_bank_switch(struct sdw_bus * bus)105 static int generic_pre_bank_switch(struct sdw_bus *bus)
106 {
107 struct sdw_cdns *cdns = bus_to_cdns(bus);
108 struct sdw_intel *sdw = cdns_to_intel(cdns);
109
110 return sdw->link_res->hw_ops->pre_bank_switch(sdw);
111 }
112
generic_post_bank_switch(struct sdw_bus * bus)113 static int generic_post_bank_switch(struct sdw_bus *bus)
114 {
115 struct sdw_cdns *cdns = bus_to_cdns(bus);
116 struct sdw_intel *sdw = cdns_to_intel(cdns);
117
118 return sdw->link_res->hw_ops->post_bank_switch(sdw);
119 }
120
generic_new_peripheral_assigned(struct sdw_bus * bus,struct sdw_slave * slave,int dev_num)121 static void generic_new_peripheral_assigned(struct sdw_bus *bus,
122 struct sdw_slave *slave,
123 int dev_num)
124 {
125 struct sdw_cdns *cdns = bus_to_cdns(bus);
126 struct sdw_intel *sdw = cdns_to_intel(cdns);
127 int dev_num_min;
128 int dev_num_max;
129 bool wake_capable = slave->prop.wake_capable || is_wake_capable(slave);
130
131 if (wake_capable) {
132 dev_num_min = SDW_INTEL_DEV_NUM_IDA_MIN;
133 dev_num_max = SDW_MAX_DEVICES;
134 } else {
135 dev_num_min = 1;
136 dev_num_max = SDW_INTEL_DEV_NUM_IDA_MIN - 1;
137 }
138
139 /* paranoia check, this should never happen */
140 if (dev_num < dev_num_min || dev_num > dev_num_max) {
141 dev_err(bus->dev, "%s: invalid dev_num %d, wake supported %d\n",
142 __func__, dev_num, slave->prop.wake_capable);
143 return;
144 }
145
146 if (sdw->link_res->hw_ops->program_sdi && wake_capable)
147 sdw->link_res->hw_ops->program_sdi(sdw, dev_num);
148 }
149
sdw_master_read_intel_prop(struct sdw_bus * bus)150 static int sdw_master_read_intel_prop(struct sdw_bus *bus)
151 {
152 struct sdw_master_prop *prop = &bus->prop;
153 struct sdw_intel_prop *intel_prop;
154 struct fwnode_handle *link;
155 char name[32];
156 u32 quirk_mask;
157
158 /* Find master handle */
159 snprintf(name, sizeof(name),
160 "mipi-sdw-link-%d-subproperties", bus->link_id);
161
162 link = device_get_named_child_node(bus->dev, name);
163 if (!link) {
164 dev_err(bus->dev, "Master node %s not found\n", name);
165 return -EIO;
166 }
167
168 fwnode_property_read_u32(link,
169 "intel-sdw-ip-clock",
170 &prop->mclk_freq);
171
172 if (mclk_divider)
173 /* use kernel parameter for BIOS or board work-arounds */
174 prop->mclk_freq /= mclk_divider;
175 else
176 /* the values reported by BIOS are the 2x clock, not the bus clock */
177 prop->mclk_freq /= 2;
178
179 fwnode_property_read_u32(link,
180 "intel-quirk-mask",
181 &quirk_mask);
182
183 if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
184 prop->hw_disabled = true;
185
186 prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
187 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
188
189 intel_prop = devm_kzalloc(bus->dev, sizeof(*intel_prop), GFP_KERNEL);
190 if (!intel_prop) {
191 fwnode_handle_put(link);
192 return -ENOMEM;
193 }
194
195 /* initialize with hardware defaults, in case the properties are not found */
196 intel_prop->clde = 0x0;
197 intel_prop->doaise2 = 0x0;
198 intel_prop->dodse2 = 0x0;
199 intel_prop->clds = 0x0;
200 intel_prop->clss = 0x0;
201 intel_prop->doaise = 0x1;
202 intel_prop->doais = 0x3;
203 intel_prop->dodse = 0x0;
204 intel_prop->dods = 0x1;
205
206 fwnode_property_read_u16(link,
207 "intel-sdw-clde",
208 &intel_prop->clde);
209 fwnode_property_read_u16(link,
210 "intel-sdw-doaise2",
211 &intel_prop->doaise2);
212 fwnode_property_read_u16(link,
213 "intel-sdw-dodse2",
214 &intel_prop->dodse2);
215 fwnode_property_read_u16(link,
216 "intel-sdw-clds",
217 &intel_prop->clds);
218 fwnode_property_read_u16(link,
219 "intel-sdw-clss",
220 &intel_prop->clss);
221 fwnode_property_read_u16(link,
222 "intel-sdw-doaise",
223 &intel_prop->doaise);
224 fwnode_property_read_u16(link,
225 "intel-sdw-doais",
226 &intel_prop->doais);
227 fwnode_property_read_u16(link,
228 "intel-sdw-dodse",
229 &intel_prop->dodse);
230 fwnode_property_read_u16(link,
231 "intel-sdw-dods",
232 &intel_prop->dods);
233 bus->vendor_specific_prop = intel_prop;
234
235 dev_dbg(bus->dev, "doaise %#x doais %#x dodse %#x dods %#x\n",
236 intel_prop->doaise,
237 intel_prop->doais,
238 intel_prop->dodse,
239 intel_prop->dods);
240
241 fwnode_handle_put(link);
242
243 return 0;
244 }
245
intel_prop_read(struct sdw_bus * bus)246 static int intel_prop_read(struct sdw_bus *bus)
247 {
248 /* Initialize with default handler to read all DisCo properties */
249 sdw_master_read_prop(bus);
250
251 /* read Intel-specific properties */
252 sdw_master_read_intel_prop(bus);
253
254 return 0;
255 }
256
257 static DEFINE_IDA(intel_peripheral_ida);
258
intel_get_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)259 static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
260 {
261 int bit;
262
263 if (slave->prop.wake_capable || is_wake_capable(slave))
264 return ida_alloc_range(&intel_peripheral_ida,
265 SDW_INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES,
266 GFP_KERNEL);
267
268 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
269 if (bit == SDW_MAX_DEVICES)
270 return -ENODEV;
271
272 return bit;
273 }
274
intel_put_device_num_ida(struct sdw_bus * bus,struct sdw_slave * slave)275 static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
276 {
277 if (slave->prop.wake_capable || is_wake_capable(slave))
278 ida_free(&intel_peripheral_ida, slave->dev_num);
279 }
280
281 static struct sdw_master_ops sdw_intel_ops = {
282 .read_prop = intel_prop_read,
283 .override_adr = sdw_dmi_override_adr,
284 .xfer_msg = cdns_xfer_msg,
285 .xfer_msg_defer = cdns_xfer_msg_defer,
286 .set_bus_conf = cdns_bus_conf,
287 .pre_bank_switch = generic_pre_bank_switch,
288 .post_bank_switch = generic_post_bank_switch,
289 .read_ping_status = cdns_read_ping_status,
290 .get_device_num = intel_get_device_num_ida,
291 .put_device_num = intel_put_device_num_ida,
292 .new_peripheral_assigned = generic_new_peripheral_assigned,
293
294 .bpt_send_async = generic_bpt_send_async,
295 .bpt_wait = generic_bpt_wait,
296 };
297
298 /*
299 * probe and init (aux_dev_id argument is required by function prototype but not used)
300 */
intel_link_probe(struct auxiliary_device * auxdev,const struct auxiliary_device_id * aux_dev_id)301 static int intel_link_probe(struct auxiliary_device *auxdev,
302 const struct auxiliary_device_id *aux_dev_id)
303
304 {
305 struct device *dev = &auxdev->dev;
306 struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
307 struct sdw_intel *sdw;
308 struct sdw_cdns *cdns;
309 struct sdw_bus *bus;
310 int ret;
311
312 sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
313 if (!sdw)
314 return -ENOMEM;
315
316 cdns = &sdw->cdns;
317 bus = &cdns->bus;
318
319 sdw->instance = auxdev->id;
320 sdw->link_res = &ldev->link_res;
321 cdns->dev = dev;
322 cdns->registers = sdw->link_res->registers;
323 cdns->ip_offset = sdw->link_res->ip_offset;
324 cdns->instance = sdw->instance;
325 cdns->msg_count = 0;
326
327 /* single controller for all SoundWire links */
328 bus->controller_id = 0;
329
330 bus->link_id = auxdev->id;
331 bus->clk_stop_timeout = 1;
332
333 /*
334 * paranoia check: make sure ACPI-reported number of links is aligned with
335 * hardware capabilities.
336 */
337 ret = sdw_intel_get_link_count(sdw);
338 if (ret < 0) {
339 dev_err(dev, "%s: sdw_intel_get_link_count failed: %d\n", __func__, ret);
340 return ret;
341 }
342 if (ret <= sdw->instance) {
343 dev_err(dev, "%s: invalid link id %d, link count %d\n", __func__, auxdev->id, ret);
344 return -EINVAL;
345 }
346
347 sdw_cdns_probe(cdns);
348
349 /* Set ops */
350 bus->ops = &sdw_intel_ops;
351
352 /* set driver data, accessed by snd_soc_dai_get_drvdata() */
353 auxiliary_set_drvdata(auxdev, cdns);
354
355 /* use generic bandwidth allocation algorithm */
356 sdw->cdns.bus.compute_params = sdw_compute_params;
357
358 ret = sdw_bus_master_add(bus, dev, dev->fwnode);
359 if (ret) {
360 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
361 return ret;
362 }
363
364 if (bus->prop.hw_disabled)
365 dev_info(dev,
366 "SoundWire master %d is disabled, will be ignored\n",
367 bus->link_id);
368 /*
369 * Ignore BIOS err_threshold, it's a really bad idea when dealing
370 * with multiple hardware synchronized links
371 */
372 bus->prop.err_threshold = 0;
373
374 return 0;
375 }
376
intel_link_startup(struct auxiliary_device * auxdev)377 int intel_link_startup(struct auxiliary_device *auxdev)
378 {
379 struct device *dev = &auxdev->dev;
380 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
381 struct sdw_intel *sdw = cdns_to_intel(cdns);
382 struct sdw_bus *bus = &cdns->bus;
383 int link_flags;
384 bool multi_link;
385 u32 clock_stop_quirks;
386 int ret;
387
388 if (bus->prop.hw_disabled) {
389 dev_info(dev,
390 "SoundWire master %d is disabled, ignoring\n",
391 sdw->instance);
392 return 0;
393 }
394
395 link_flags = md_flags >> (bus->link_id * 8);
396 multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
397 if (!multi_link) {
398 dev_dbg(dev, "Multi-link is disabled\n");
399 } else {
400 /*
401 * hardware-based synchronization is required regardless
402 * of the number of segments used by a stream: SSP-based
403 * synchronization is gated by gsync when the multi-master
404 * mode is set.
405 */
406 bus->hw_sync_min_links = 1;
407 }
408 bus->multi_link = multi_link;
409
410 /* Initialize shim, controller */
411 ret = sdw_intel_link_power_up(sdw);
412 if (ret)
413 goto err_init;
414
415 /* Register DAIs */
416 ret = sdw_intel_register_dai(sdw);
417 if (ret) {
418 dev_err(dev, "DAI registration failed: %d\n", ret);
419 goto err_power_up;
420 }
421
422 sdw_intel_debugfs_init(sdw);
423
424 /* Enable runtime PM */
425 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
426 pm_runtime_set_autosuspend_delay(dev,
427 INTEL_MASTER_SUSPEND_DELAY_MS);
428 pm_runtime_use_autosuspend(dev);
429 pm_runtime_mark_last_busy(dev);
430
431 pm_runtime_set_active(dev);
432 pm_runtime_enable(dev);
433
434 pm_runtime_resume(bus->dev);
435 }
436
437 /* start bus */
438 ret = sdw_intel_start_bus(sdw);
439 if (ret) {
440 dev_err(dev, "bus start failed: %d\n", ret);
441 goto err_pm_runtime;
442 }
443
444 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
445 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
446 /*
447 * To keep the clock running we need to prevent
448 * pm_runtime suspend from happening by increasing the
449 * reference count.
450 * This quirk is specified by the parent PCI device in
451 * case of specific latency requirements. It will have
452 * no effect if pm_runtime is disabled by the user via
453 * a module parameter for testing purposes.
454 */
455 pm_runtime_get_noresume(dev);
456 }
457
458 /*
459 * The runtime PM status of Slave devices is "Unsupported"
460 * until they report as ATTACHED. If they don't, e.g. because
461 * there are no Slave devices populated or if the power-on is
462 * delayed or dependent on a power switch, the Master will
463 * remain active and prevent its parent from suspending.
464 *
465 * Conditionally force the pm_runtime core to re-evaluate the
466 * Master status in the absence of any Slave activity. A quirk
467 * is provided to e.g. deal with Slaves that may be powered on
468 * with a delay. A more complete solution would require the
469 * definition of Master properties.
470 */
471 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) {
472 pm_runtime_mark_last_busy(bus->dev);
473 pm_runtime_mark_last_busy(dev);
474 pm_runtime_idle(dev);
475 }
476
477 sdw->startup_done = true;
478 return 0;
479
480 err_pm_runtime:
481 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME))
482 pm_runtime_disable(dev);
483 err_power_up:
484 sdw_intel_link_power_down(sdw);
485 err_init:
486 return ret;
487 }
488
intel_link_remove(struct auxiliary_device * auxdev)489 static void intel_link_remove(struct auxiliary_device *auxdev)
490 {
491 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
492 struct sdw_intel *sdw = cdns_to_intel(cdns);
493 struct sdw_bus *bus = &cdns->bus;
494
495 /*
496 * Since pm_runtime is already disabled, we don't decrease
497 * the refcount when the clock_stop_quirk is
498 * SDW_INTEL_CLK_STOP_NOT_ALLOWED
499 */
500 if (!bus->prop.hw_disabled) {
501 sdw_intel_debugfs_exit(sdw);
502 cancel_delayed_work_sync(&cdns->attach_dwork);
503 sdw_cdns_enable_interrupt(cdns, false);
504 }
505 sdw_bus_master_delete(bus);
506 }
507
intel_link_process_wakeen_event(struct auxiliary_device * auxdev)508 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
509 {
510 struct device *dev = &auxdev->dev;
511 struct sdw_intel *sdw;
512 struct sdw_bus *bus;
513
514 sdw = auxiliary_get_drvdata(auxdev);
515 bus = &sdw->cdns.bus;
516
517 if (bus->prop.hw_disabled || !sdw->startup_done) {
518 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
519 bus->link_id);
520 return 0;
521 }
522
523 if (!sdw_intel_shim_check_wake(sdw))
524 return 0;
525
526 /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
527 sdw_intel_shim_wake(sdw, false);
528
529 /*
530 * resume the Master, which will generate a bus reset and result in
531 * Slaves re-attaching and be re-enumerated. The SoundWire physical
532 * device which generated the wake will trigger an interrupt, which
533 * will in turn cause the corresponding Linux Slave device to be
534 * resumed and the Slave codec driver to check the status.
535 */
536 pm_request_resume(dev);
537
538 return 0;
539 }
540
541 /*
542 * PM calls
543 */
544
intel_resume_child_device(struct device * dev,void * data)545 int intel_resume_child_device(struct device *dev, void *data)
546 {
547 int ret;
548 struct sdw_slave *slave = dev_to_sdw_dev(dev);
549
550 if (!slave->probed) {
551 dev_dbg(dev, "skipping device, no probed driver\n");
552 return 0;
553 }
554 if (!slave->dev_num_sticky) {
555 dev_dbg(dev, "skipping device, never detected on bus\n");
556 return 0;
557 }
558
559 ret = pm_runtime_resume(dev);
560 if (ret < 0) {
561 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
562 return ret;
563 }
564
565 return 0;
566 }
567
intel_pm_prepare(struct device * dev)568 static int __maybe_unused intel_pm_prepare(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 (pm_runtime_suspended(dev) &&
585 pm_runtime_suspended(dev->parent) &&
586 ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
587 !clock_stop_quirks)) {
588 /*
589 * if we've enabled clock stop, and the parent is suspended, the SHIM registers
590 * are not accessible and the shim wake cannot be disabled.
591 * The only solution is to resume the entire bus to full power
592 */
593
594 /*
595 * If any operation in this block fails, we keep going since we don't want
596 * to prevent system suspend from happening and errors should be recoverable
597 * on resume.
598 */
599
600 /*
601 * first resume the device for this link. This will also by construction
602 * resume the PCI parent device.
603 */
604 ret = pm_runtime_resume(dev);
605 if (ret < 0) {
606 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
607 return 0;
608 }
609
610 /*
611 * Continue resuming the entire bus (parent + child devices) to exit
612 * the clock stop mode. If there are no devices connected on this link
613 * this is a no-op.
614 * The resume to full power could have been implemented with a .prepare
615 * step in SoundWire codec drivers. This would however require a lot
616 * of code to handle an Intel-specific corner case. It is simpler in
617 * practice to add a loop at the link level.
618 */
619 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
620
621 if (ret < 0)
622 dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
623 }
624
625 return 0;
626 }
627
intel_suspend(struct device * dev)628 static int __maybe_unused intel_suspend(struct device *dev)
629 {
630 struct sdw_cdns *cdns = dev_get_drvdata(dev);
631 struct sdw_intel *sdw = cdns_to_intel(cdns);
632 struct sdw_bus *bus = &cdns->bus;
633 u32 clock_stop_quirks;
634 int ret;
635
636 if (bus->prop.hw_disabled || !sdw->startup_done) {
637 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
638 bus->link_id);
639 return 0;
640 }
641
642 /* Prevent runtime PM from racing with the code below. */
643 pm_runtime_disable(dev);
644
645 if (pm_runtime_status_suspended(dev)) {
646 dev_dbg(dev, "pm_runtime status: suspended\n");
647
648 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
649
650 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
651 !clock_stop_quirks) {
652
653 if (pm_runtime_status_suspended(dev->parent)) {
654 /*
655 * paranoia check: this should not happen with the .prepare
656 * resume to full power
657 */
658 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
659 } else {
660 sdw_intel_shim_wake(sdw, false);
661 }
662 }
663
664 return 0;
665 }
666
667 ret = sdw_intel_stop_bus(sdw, false);
668 if (ret < 0) {
669 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
670 return ret;
671 }
672
673 return 0;
674 }
675
intel_suspend_runtime(struct device * dev)676 static int __maybe_unused intel_suspend_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 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
691
692 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
693 ret = sdw_intel_stop_bus(sdw, false);
694 if (ret < 0) {
695 dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
696 __func__, ret);
697 return ret;
698 }
699 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
700 ret = sdw_intel_stop_bus(sdw, true);
701 if (ret < 0) {
702 dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
703 __func__, ret);
704 return ret;
705 }
706 } else {
707 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
708 __func__, clock_stop_quirks);
709 ret = -EINVAL;
710 }
711
712 return ret;
713 }
714
intel_resume(struct device * dev)715 static int __maybe_unused intel_resume(struct device *dev)
716 {
717 struct sdw_cdns *cdns = dev_get_drvdata(dev);
718 struct sdw_intel *sdw = cdns_to_intel(cdns);
719 struct sdw_bus *bus = &cdns->bus;
720 int ret;
721
722 if (bus->prop.hw_disabled || !sdw->startup_done) {
723 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
724 bus->link_id);
725 return 0;
726 }
727
728 ret = sdw_intel_link_power_up(sdw);
729 if (ret) {
730 dev_err(dev, "%s failed: %d\n", __func__, ret);
731 return ret;
732 }
733
734 /*
735 * make sure all Slaves are tagged as UNATTACHED and provide
736 * reason for reinitialization
737 */
738 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
739
740 ret = sdw_intel_start_bus(sdw);
741 if (ret < 0) {
742 dev_err(dev, "cannot start bus during resume\n");
743 sdw_intel_link_power_down(sdw);
744 return ret;
745 }
746
747 /*
748 * Runtime PM has been disabled in intel_suspend(), so set the status
749 * to active because the device has just been resumed and re-enable
750 * runtime PM.
751 */
752 pm_runtime_set_active(dev);
753 pm_runtime_enable(dev);
754
755 /*
756 * after system resume, the pm_runtime suspend() may kick in
757 * during the enumeration, before any children device force the
758 * master device to remain active. Using pm_runtime_get()
759 * routines is not really possible, since it'd prevent the
760 * master from suspending.
761 * A reasonable compromise is to update the pm_runtime
762 * counters and delay the pm_runtime suspend by several
763 * seconds, by when all enumeration should be complete.
764 */
765 pm_runtime_mark_last_busy(bus->dev);
766 pm_runtime_mark_last_busy(dev);
767
768 return 0;
769 }
770
intel_resume_runtime(struct device * dev)771 static int __maybe_unused intel_resume_runtime(struct device *dev)
772 {
773 struct sdw_cdns *cdns = dev_get_drvdata(dev);
774 struct sdw_intel *sdw = cdns_to_intel(cdns);
775 struct sdw_bus *bus = &cdns->bus;
776 u32 clock_stop_quirks;
777 int ret;
778
779 if (bus->prop.hw_disabled || !sdw->startup_done) {
780 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
781 bus->link_id);
782 return 0;
783 }
784
785 /* unconditionally disable WAKEEN interrupt */
786 sdw_intel_shim_wake(sdw, false);
787
788 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
789
790 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
791 ret = sdw_intel_link_power_up(sdw);
792 if (ret) {
793 dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
794 return ret;
795 }
796
797 /*
798 * make sure all Slaves are tagged as UNATTACHED and provide
799 * reason for reinitialization
800 */
801 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
802
803 ret = sdw_intel_start_bus(sdw);
804 if (ret < 0) {
805 dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
806 sdw_intel_link_power_down(sdw);
807 return ret;
808 }
809
810 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
811 ret = sdw_intel_link_power_up(sdw);
812 if (ret) {
813 dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
814 return ret;
815 }
816
817 ret = sdw_intel_start_bus_after_reset(sdw);
818 if (ret < 0) {
819 dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
820 sdw_intel_link_power_down(sdw);
821 return ret;
822 }
823 } else if (!clock_stop_quirks) {
824
825 sdw_intel_check_clock_stop(sdw);
826
827 ret = sdw_intel_link_power_up(sdw);
828 if (ret) {
829 dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
830 return ret;
831 }
832
833 ret = sdw_intel_start_bus_after_clock_stop(sdw);
834 if (ret < 0) {
835 dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
836 sdw_intel_link_power_down(sdw);
837 return ret;
838 }
839 } else {
840 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
841 __func__, clock_stop_quirks);
842 ret = -EINVAL;
843 }
844
845 return ret;
846 }
847
848 static const struct dev_pm_ops intel_pm = {
849 .prepare = intel_pm_prepare,
850 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
851 SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
852 };
853
854 static const struct auxiliary_device_id intel_link_id_table[] = {
855 { .name = "soundwire_intel.link" },
856 {},
857 };
858 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
859
860 static struct auxiliary_driver sdw_intel_drv = {
861 .probe = intel_link_probe,
862 .remove = intel_link_remove,
863 .driver = {
864 /* auxiliary_driver_register() sets .name to be the modname */
865 .pm = &intel_pm,
866 },
867 .id_table = intel_link_id_table
868 };
869 module_auxiliary_driver(sdw_intel_drv);
870
871 MODULE_LICENSE("Dual BSD/GPL");
872 MODULE_DESCRIPTION("Intel Soundwire Link Driver");
873